| /* |
| * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. |
| * Copyright (C) 2008 - 2018 Bart Van Assche <bvanassche@acm.org>. |
| * Copyright (C) 2008 Vladislav Bolkhovitin <vst@vlnb.net> |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| * |
| */ |
| |
| #undef pr_fmt |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/ctype.h> |
| #include <linux/kthread.h> |
| #include <linux/string.h> |
| #include <linux/delay.h> |
| #if !defined(INSIDE_KERNEL_TREE) |
| #include <linux/version.h> |
| #endif |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) |
| #include <linux/atomic.h> |
| #else |
| #include <asm/atomic.h> |
| #endif |
| #include <rdma/ib_cache.h> |
| #include "ib_srpt.h" |
| #define LOG_PREFIX "ib_srpt" /* Prefix for SCST tracing macros. */ |
| #if defined(INSIDE_KERNEL_TREE) |
| #include <scst/scst_debug.h> |
| #else |
| #include "scst_debug.h" |
| #endif |
| |
| /* Name of this kernel module. */ |
| #define DRV_NAME "ib_srpt" |
| #define DRV_VERSION "3.5.0" "#" __stringify(OFED_FLAVOR) |
| #define DRV_RELDATE "21 December 2020" |
| #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) |
| /* Flags to be used in SCST debug tracing statements. */ |
| #define DEFAULT_SRPT_TRACE_FLAGS (TRACE_OUT_OF_MEM | TRACE_MINOR \ |
| | TRACE_MGMT | TRACE_SPECIAL) |
| /* Name of the entry that will be created under /proc/scsi_tgt/ib_srpt. */ |
| #define SRPT_PROC_TRACE_LEVEL_NAME "trace_level" |
| #endif |
| |
| #define DEFAULT_SRPT_ID_STRING "SCST SRP target" |
| |
| MODULE_AUTHOR("Vu Pham and Bart Van Assche"); |
| MODULE_DESCRIPTION("SCSI RDMA Protocol target driver " |
| "v" DRV_VERSION " (" DRV_RELDATE ")"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_IMPORT_NS(SCST); |
| |
| /* |
| * Global Variables |
| */ |
| |
| static u64 srpt_service_guid; |
| static atomic_t srpt_device_count; |
| #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) |
| static unsigned long trace_flag = DEFAULT_SRPT_TRACE_FLAGS; |
| module_param(trace_flag, long, 0644); |
| MODULE_PARM_DESC(trace_flag, "SCST trace flags."); |
| #endif |
| |
| static u16 rdma_cm_port; |
| module_param(rdma_cm_port, short, 0444); |
| MODULE_PARM_DESC(rdma_cm_port, "Port number RDMA/CM will bind to."); |
| |
| static unsigned int srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; |
| module_param(srp_max_rdma_size, int, 0644); |
| MODULE_PARM_DESC(srp_max_rdma_size, |
| "Maximum size of SRP RDMA transfers for new connections."); |
| |
| static unsigned int srp_max_req_size = DEFAULT_MAX_REQ_SIZE; |
| module_param(srp_max_req_size, int, 0444); |
| MODULE_PARM_DESC(srp_max_req_size, |
| "Maximum size of SRP request messages in bytes."); |
| |
| static unsigned int srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; |
| module_param(srp_max_rsp_size, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(srp_max_rsp_size, |
| "Maximum size of SRP response messages in bytes."); |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) \ |
| || defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5 |
| static int use_srq; |
| #else |
| static bool use_srq; |
| #endif |
| module_param(use_srq, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(use_srq, "Whether or not to use SRQ"); |
| |
| static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE; |
| module_param(srpt_srq_size, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(srpt_srq_size, |
| "Shared receive queue (SRQ) size."); |
| |
| static int srpt_sq_size = DEF_SRPT_SQ_SIZE; |
| module_param(srpt_sq_size, int, 0444); |
| MODULE_PARM_DESC(srpt_sq_size, "Per-channel send queue (SQ) size."); |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) \ |
| || defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5 |
| static int use_port_guid_in_session_name; |
| #else |
| static bool use_port_guid_in_session_name; |
| #endif |
| module_param(use_port_guid_in_session_name, bool, 0444); |
| MODULE_PARM_DESC(use_port_guid_in_session_name, |
| "Use target port ID in the session name such that" |
| " redundant paths between multiport systems can be masked."); |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) \ |
| || defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5 |
| static int use_node_guid_in_target_name; |
| #else |
| static bool use_node_guid_in_target_name; |
| #endif |
| module_param(use_node_guid_in_target_name, bool, 0444); |
| MODULE_PARM_DESC(use_node_guid_in_target_name, |
| "Use HCA node GUID as SCST target name."); |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) |
| static int srpt_get_u64_x(char *buffer, struct kernel_param *kp) |
| #else |
| static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp) |
| #endif |
| { |
| return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg); |
| } |
| module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid, |
| 0444); |
| MODULE_PARM_DESC(srpt_service_guid, |
| "Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA."); |
| |
| static unsigned int max_sge_delta; |
| module_param(max_sge_delta, uint, 0444); |
| MODULE_PARM_DESC(max_sge_delta, "Number to subtract from max_sge (obsolete)."); |
| |
| /* |
| * Note: changing any of the two constants below into SCST_CONTEXT_DIRECT is |
| * dangerous because it might cause IB completions to be processed too late |
| * ("IB completion for idx <n> has not been received in time"). |
| */ |
| static const enum scst_exec_context srpt_new_iu_context = SCST_CONTEXT_THREAD; |
| static const enum scst_exec_context srpt_xmt_rsp_context = SCST_CONTEXT_THREAD; |
| static const enum scst_exec_context srpt_send_context = SCST_CONTEXT_DIRECT; |
| |
| static struct ib_client srpt_client; |
| static struct scst_tgt_template srpt_template; |
| static struct workqueue_struct *srpt_wq; |
| static struct net *srpt_net_ns; |
| static struct rdma_cm_id *rdma_cm_id; |
| |
| static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx); |
| static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch); |
| static void srpt_unregister_ch(struct srpt_rdma_ch *ch); |
| |
| /* |
| * The only allowed channel state changes are those that change the channel |
| * state into a state with a higher numerical value. Hence the new > prev test. |
| */ |
| static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new) |
| { |
| unsigned long flags; |
| enum rdma_ch_state prev; |
| bool changed = false; |
| |
| spin_lock_irqsave(&ch->spinlock, flags); |
| prev = ch->state; |
| if (new > prev) { |
| ch->state = new; |
| changed = true; |
| } |
| spin_unlock_irqrestore(&ch->spinlock, flags); |
| |
| return changed; |
| } |
| |
| /* |
| * srpt_adjust_req_lim() - Adjust ch->req_lim and ch->req_lim_delta atomically. |
| * |
| * Returns the new value of ch->req_lim. |
| */ |
| static int srpt_adjust_req_lim(struct srpt_rdma_ch *ch, int req_lim_change, |
| int req_lim_delta_change) |
| { |
| int req_lim; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ch->spinlock, flags); |
| ch->req_lim += req_lim_change; |
| req_lim = ch->req_lim; |
| ch->req_lim_delta += req_lim_delta_change; |
| spin_unlock_irqrestore(&ch->spinlock, flags); |
| |
| return req_lim; |
| } |
| |
| /* |
| * srpt_inc_req_lim() - Increase ch->req_lim and decrease ch->req_lim_delta. |
| * |
| * Returns one more than the previous value of ch->req_lim_delta. |
| */ |
| static int srpt_inc_req_lim(struct srpt_rdma_ch *ch) |
| { |
| int req_lim_delta; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ch->spinlock, flags); |
| req_lim_delta = ch->req_lim_delta + 1; |
| ch->req_lim += req_lim_delta; |
| ch->req_lim_delta = 0; |
| spin_unlock_irqrestore(&ch->spinlock, flags); |
| |
| return req_lim_delta; |
| } |
| |
| /* |
| * srpt_undo_inc_req_lim() - Undo the effect of srpt_inc_req_lim. |
| */ |
| static int srpt_undo_inc_req_lim(struct srpt_rdma_ch *ch, int req_lim_delta) |
| { |
| return srpt_adjust_req_lim(ch, -req_lim_delta, req_lim_delta - 1); |
| } |
| |
| /** |
| * srpt_event_handler - asynchronous IB event callback function |
| * @handler: IB event handler registered by ib_register_event_handler(). |
| * @event: Description of the event that occurred. |
| * |
| * Callback function called by the InfiniBand core when an asynchronous IB |
| * event occurs. This callback may occur in interrupt context. See also |
| * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand |
| * Architecture Specification. |
| */ |
| static void srpt_event_handler(struct ib_event_handler *handler, |
| struct ib_event *event) |
| { |
| struct srpt_device *sdev; |
| struct srpt_port *sport; |
| u8 port_num; |
| |
| sdev = ib_get_client_data(event->device, &srpt_client); |
| if (!sdev || sdev->device != event->device) |
| return; |
| |
| pr_debug("ASYNC event= %d on device= %s\n", event->event, |
| dev_name(&sdev->device->dev)); |
| |
| switch (event->event) { |
| case IB_EVENT_PORT_ERR: |
| port_num = event->element.port_num - 1; |
| if (port_num < sdev->device->phys_port_cnt) { |
| sport = &sdev->port[port_num]; |
| sport->lid = 0; |
| sport->sm_lid = 0; |
| } else { |
| WARN(true, "event %d: port_num %d out of range 1..%d\n", |
| event->event, port_num + 1, |
| sdev->device->phys_port_cnt); |
| } |
| break; |
| case IB_EVENT_PORT_ACTIVE: |
| case IB_EVENT_LID_CHANGE: |
| case IB_EVENT_PKEY_CHANGE: |
| case IB_EVENT_SM_CHANGE: |
| case IB_EVENT_CLIENT_REREGISTER: |
| case IB_EVENT_GID_CHANGE: |
| /* Refresh port data asynchronously. */ |
| port_num = event->element.port_num - 1; |
| if (port_num < sdev->device->phys_port_cnt) { |
| sport = &sdev->port[port_num]; |
| if (!sport->lid && !sport->sm_lid) |
| schedule_work(&sport->work); |
| } else { |
| WARN(true, "event %d: port_num %d out of range 1..%d\n", |
| event->event, port_num + 1, |
| sdev->device->phys_port_cnt); |
| } |
| break; |
| default: |
| pr_err("received unrecognized IB event %d\n", event->event); |
| break; |
| } |
| } |
| |
| /** |
| * srpt_srq_event - SRQ event callback function |
| * @event: Description of the event that occurred. |
| * @ctx: Context pointer specified at SRQ creation time. |
| */ |
| static void srpt_srq_event(struct ib_event *event, void *ctx) |
| { |
| pr_debug("SRQ event %d\n", event->event); |
| } |
| |
| static const char *get_ch_state_name(enum rdma_ch_state s) |
| { |
| switch (s) { |
| case CH_CONNECTING: |
| return "connecting"; |
| case CH_LIVE: |
| return "live"; |
| case CH_DISCONNECTING: |
| return "disconnecting"; |
| case CH_DRAINING: |
| return "draining"; |
| case CH_DISCONNECTED: |
| return "disconnected"; |
| } |
| return "???"; |
| } |
| |
| /** |
| * srpt_qp_event - QP event callback function |
| * @event: Description of the event that occurred. |
| * @ch: SRPT RDMA channel. |
| */ |
| static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) |
| { |
| pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n", |
| event->event, ch, ch->sess_name, ch->qp->qp_num, |
| get_ch_state_name(ch->state)); |
| |
| switch (event->event) { |
| case IB_EVENT_COMM_EST: |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) || defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19) |
| if (ch->using_rdma_cm) |
| rdma_notify(ch->rdma_cm.cm_id, event->event); |
| else |
| ib_cm_notify(ch->ib_cm.cm_id, event->event); |
| #else |
| /* Vanilla 2.6.19 kernel (or before) without OFED. */ |
| pr_err("how to perform ib_cm_notify() on a vanilla 2.6.18 kernel ???\n"); |
| #endif |
| break; |
| case IB_EVENT_QP_LAST_WQE_REACHED: |
| pr_debug("%s-%d, state %s: received Last WQE event.\n", |
| ch->sess_name, ch->qp->qp_num, |
| get_ch_state_name(ch->state)); |
| break; |
| default: |
| pr_err("received unrecognized IB QP event %d\n", event->event); |
| break; |
| } |
| } |
| |
| /** |
| * srpt_set_ioc - initialize a IOUnitInfo structure |
| * @c_list: controller list. |
| * @slot: one-based slot number. |
| * @value: four-bit value. |
| * |
| * Copies the lowest four bits of value in element slot of the array of four |
| * bit elements called c_list (controller list). The index slot is one-based. |
| */ |
| static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) |
| { |
| u16 id; |
| u8 tmp; |
| |
| id = (slot - 1) / 2; |
| if (slot & 0x1) { |
| tmp = c_list[id] & 0xf; |
| c_list[id] = (value << 4) | tmp; |
| } else { |
| tmp = c_list[id] & 0xf0; |
| c_list[id] = (value & 0xf) | tmp; |
| } |
| } |
| |
| /** |
| * srpt_get_class_port_info - copy ClassPortInfo to a management datagram |
| * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO. |
| * |
| * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture |
| * Specification. |
| */ |
| static void srpt_get_class_port_info(struct ib_dm_mad *mad) |
| { |
| struct ib_class_port_info *cif; |
| |
| cif = (struct ib_class_port_info *)mad->data; |
| memset(cif, 0, sizeof(*cif)); |
| cif->base_version = 1; |
| cif->class_version = 1; |
| #ifndef HAVE_IB_SET_CPI_RESP_TIME |
| cif->resp_time_value = 20; |
| #else |
| ib_set_cpi_resp_time(cif, 20); |
| #endif |
| |
| mad->mad_hdr.status = 0; |
| } |
| |
| /** |
| * srpt_get_iou - write IOUnitInfo to a management datagram |
| * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO. |
| * |
| * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture |
| * Specification. See also section B.7, table B.6 in the SRP r16a document. |
| */ |
| static void srpt_get_iou(struct ib_dm_mad *mad) |
| { |
| struct ib_dm_iou_info *ioui; |
| u8 slot; |
| int i; |
| |
| ioui = (struct ib_dm_iou_info *)mad->data; |
| ioui->change_id = cpu_to_be16(1); |
| ioui->max_controllers = 16; |
| |
| /* set present for slot 1 and empty for the rest */ |
| srpt_set_ioc(ioui->controller_list, 1, 1); |
| for (i = 1, slot = 2; i < 16; i++, slot++) |
| srpt_set_ioc(ioui->controller_list, slot, 0); |
| |
| mad->mad_hdr.status = 0; |
| } |
| |
| /** |
| * srpt_get_ioc - write IOControllerprofile to a management datagram |
| * @sport: HCA port through which the MAD has been received. |
| * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query. |
| * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE. |
| * |
| * See also section 16.3.3.4 IOControllerProfile in the InfiniBand |
| * Architecture Specification. See also section B.7, table B.7 in the SRP |
| * r16a document. |
| */ |
| static void srpt_get_ioc(struct srpt_port *sport, u32 slot, |
| struct ib_dm_mad *mad) |
| { |
| struct srpt_device *sdev = sport->sdev; |
| struct ib_dm_ioc_profile *iocp; |
| int send_queue_depth; |
| |
| iocp = (struct ib_dm_ioc_profile *)mad->data; |
| |
| if (!slot || slot > 16) { |
| mad->mad_hdr.status |
| = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
| return; |
| } |
| |
| if (slot > 2) { |
| mad->mad_hdr.status |
| = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
| return; |
| } |
| |
| if (sdev->use_srq) |
| send_queue_depth = sdev->srq_size; |
| else |
| send_queue_depth = min(MAX_SRPT_RQ_SIZE, |
| sdev->dev_attr.max_qp_wr); |
| |
| memset(iocp, 0, sizeof(*iocp)); |
| mutex_lock(&sport->mutex); |
| strlcpy(iocp->id_string, sport->port_id, sizeof(iocp->id_string)); |
| mutex_unlock(&sport->mutex); |
| iocp->guid = cpu_to_be64(srpt_service_guid); |
| iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id); |
| iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id); |
| iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver); |
| iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id); |
| iocp->subsys_device_id = 0x0; |
| iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
| iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); |
| iocp->protocol = cpu_to_be16(SRP_PROTOCOL); |
| iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); |
| iocp->send_queue_depth = cpu_to_be16(send_queue_depth); |
| |
| iocp->rdma_read_depth = 4; |
| iocp->send_size = cpu_to_be32(srp_max_req_size); |
| iocp->rdma_size = cpu_to_be32(min(max(srp_max_rdma_size, 256U), |
| 1U << 24)); |
| iocp->num_svc_entries = 1; |
| iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | |
| SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; |
| |
| mad->mad_hdr.status = 0; |
| } |
| |
| /** |
| * srpt_get_svc_entries - write ServiceEntries to a management datagram |
| * @ioc_guid: I/O controller GUID to use in reply. |
| * @slot: I/O controller number. |
| * @hi: End of the range of service entries to be specified in the reply. |
| * @lo: Start of the range of service entries to be specified in the reply.. |
| * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES. |
| * |
| * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture |
| * Specification. See also section B.7, table B.8 in the SRP r16a document. |
| */ |
| static void srpt_get_svc_entries(u64 ioc_guid, |
| u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) |
| { |
| struct ib_dm_svc_entries *svc_entries; |
| |
| WARN_ON(!ioc_guid); |
| |
| if (!slot || slot > 16) { |
| mad->mad_hdr.status |
| = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
| return; |
| } |
| |
| if (slot > 2 || lo > hi || hi > 1) { |
| mad->mad_hdr.status |
| = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
| return; |
| } |
| |
| svc_entries = (struct ib_dm_svc_entries *)mad->data; |
| memset(svc_entries, 0, sizeof(*svc_entries)); |
| svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
| snprintf(svc_entries->service_entries[0].name, |
| sizeof(svc_entries->service_entries[0].name), |
| "%s%016llx", |
| SRP_SERVICE_NAME_PREFIX, |
| ioc_guid); |
| |
| mad->mad_hdr.status = 0; |
| } |
| |
| /** |
| * srpt_mgmt_method_get - process a received management datagram |
| * @sp: HCA port through which the MAD has been received. |
| * @rq_mad: received MAD. |
| * @rsp_mad: response MAD. |
| */ |
| static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, |
| struct ib_dm_mad *rsp_mad) |
| { |
| u16 attr_id; |
| u32 slot; |
| u8 hi, lo; |
| |
| attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); |
| switch (attr_id) { |
| case DM_ATTR_CLASS_PORT_INFO: |
| srpt_get_class_port_info(rsp_mad); |
| break; |
| case DM_ATTR_IOU_INFO: |
| srpt_get_iou(rsp_mad); |
| break; |
| case DM_ATTR_IOC_PROFILE: |
| slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); |
| srpt_get_ioc(sp, slot, rsp_mad); |
| break; |
| case DM_ATTR_SVC_ENTRIES: |
| slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); |
| hi = (u8) ((slot >> 8) & 0xff); |
| lo = (u8) (slot & 0xff); |
| slot = (u16) ((slot >> 16) & 0xffff); |
| srpt_get_svc_entries(srpt_service_guid, |
| slot, hi, lo, rsp_mad); |
| break; |
| default: |
| rsp_mad->mad_hdr.status = |
| cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
| break; |
| } |
| } |
| |
| /** |
| * srpt_mad_send_handler - MAD send completion callback |
| * @mad_agent: Return value of ib_register_mad_agent(). |
| * @mad_wc: Work completion reporting that the MAD has been sent. |
| */ |
| static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, |
| struct ib_mad_send_wc *mad_wc) |
| { |
| #if HAVE_RDMA_DESTROY_AH_WITH_FLAGS |
| rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE); |
| #elif HAVE_RDMA_DESTROY_AH |
| rdma_destroy_ah(mad_wc->send_buf->ah); |
| #else |
| ib_destroy_ah(mad_wc->send_buf->ah); |
| #endif |
| ib_free_send_mad(mad_wc->send_buf); |
| } |
| |
| /** |
| * srpt_mad_recv_handler - MAD reception callback function |
| * @mad_agent: Return value of ib_register_mad_agent(). |
| * @send_buf: Not used. |
| * @mad_wc: Work completion reporting that a MAD has been received. |
| */ |
| static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, |
| #ifdef MAD_HANDLER_TAKES_SEND_BUF |
| struct ib_mad_send_buf *send_buf, |
| #endif |
| struct ib_mad_recv_wc *mad_wc) |
| { |
| struct srpt_port *sport = (struct srpt_port *)mad_agent->context; |
| struct ib_ah *ah; |
| struct ib_mad_send_buf *rsp; |
| struct ib_dm_mad *dm_mad; |
| |
| if (!mad_wc || !mad_wc->recv_buf.mad) |
| return; |
| |
| ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, |
| mad_wc->recv_buf.grh, mad_agent->port_num); |
| if (IS_ERR(ah)) |
| goto err; |
| |
| BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); |
| |
| rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, |
| mad_wc->wc->pkey_index, |
| #ifdef CREATE_SEND_MAD_HAS_AH_ARG |
| NULL, |
| #endif |
| 0, IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, |
| GFP_KERNEL |
| #ifdef CREATE_SEND_MAD_HAS_BASE_ARG |
| , IB_MGMT_BASE_VERSION |
| #endif |
| ); |
| if (IS_ERR(rsp)) |
| goto err_rsp; |
| |
| rsp->ah = ah; |
| |
| dm_mad = rsp->mad; |
| memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
| dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
| dm_mad->mad_hdr.status = 0; |
| |
| switch (mad_wc->recv_buf.mad->mad_hdr.method) { |
| case IB_MGMT_METHOD_GET: |
| srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); |
| break; |
| case IB_MGMT_METHOD_SET: |
| dm_mad->mad_hdr.status = |
| cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
| break; |
| default: |
| dm_mad->mad_hdr.status = |
| cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
| break; |
| } |
| |
| if (!ib_post_send_mad(rsp, NULL)) { |
| ib_free_recv_mad(mad_wc); |
| /* will destroy_ah & free_send_mad in send completion */ |
| return; |
| } |
| |
| ib_free_send_mad(rsp); |
| |
| err_rsp: |
| #if HAVE_RDMA_DESTROY_AH_WITH_FLAGS |
| rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); |
| #elif HAVE_RDMA_DESTROY_AH |
| rdma_destroy_ah(ah); |
| #else |
| ib_destroy_ah(ah); |
| #endif |
| |
| err: |
| ib_free_recv_mad(mad_wc); |
| } |
| |
| /** |
| * srpt_refresh_port - configure a HCA port |
| * @sport: SRPT HCA port. |
| * |
| * Enable InfiniBand management datagram processing, update the cached sm_lid, |
| * lid and gid values, and register a callback function for processing MADs |
| * on the specified port. |
| * |
| * Note: It is safe to call this function more than once for the same port. |
| */ |
| static int srpt_refresh_port(struct srpt_port *sport) |
| { |
| struct ib_mad_reg_req reg_req; |
| struct ib_port_modify port_modify; |
| struct ib_port_attr port_attr; |
| int ret; |
| char tgt_name[40]; |
| |
| ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); |
| if (ret) |
| return ret; |
| |
| sport->sm_lid = port_attr.sm_lid; |
| sport->lid = port_attr.lid; |
| |
| #if HAVE_RDMA_QUERY_GID |
| ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid); |
| #else |
| ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid |
| #ifdef IB_QUERY_GID_HAS_ATTR_ARG |
| , NULL |
| #endif |
| ); |
| #endif |
| if (ret) |
| return ret; |
| |
| memset(&port_modify, 0, sizeof(port_modify)); |
| port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
| port_modify.clr_port_cap_mask = 0; |
| |
| ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); |
| if (ret) { |
| pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n", |
| dev_name(&sport->sdev->device->dev), sport->port, ret); |
| goto register_tgt; |
| } |
| |
| if (!sport->mad_agent) { |
| memset(®_req, 0, sizeof(reg_req)); |
| reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
| reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; |
| set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); |
| set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); |
| |
| sport->mad_agent = ib_register_mad_agent(sport->sdev->device, |
| sport->port, |
| IB_QPT_GSI, |
| ®_req, 0, |
| srpt_mad_send_handler, |
| srpt_mad_recv_handler, |
| sport |
| #ifdef REGISTER_MAD_AGENT_HAS_FLAGS_ARG |
| , 0 |
| #endif |
| ); |
| if (IS_ERR(sport->mad_agent)) { |
| pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n", |
| dev_name(&sport->sdev->device->dev), sport->port, |
| PTR_ERR(sport->mad_agent)); |
| sport->mad_agent = NULL; |
| } |
| } |
| |
| register_tgt: |
| if (!sport->scst_tgt) { |
| snprintf(tgt_name, sizeof(tgt_name), "%pI6", &sport->gid); |
| sport->scst_tgt = scst_register_target(&srpt_template, |
| tgt_name); |
| if (sport->scst_tgt) |
| scst_tgt_set_tgt_priv(sport->scst_tgt, sport); |
| else |
| pr_err("Registration of target %s failed.\n", tgt_name); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * srpt_unregister_mad_agent - unregister MAD callback functions |
| * @sdev: SRPT HCA pointer. |
| * |
| * Note: It is safe to call this function more than once for the same device. |
| */ |
| static void srpt_unregister_mad_agent(struct srpt_device *sdev) |
| { |
| struct ib_port_modify port_modify = { |
| .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, |
| }; |
| struct srpt_port *sport; |
| int i; |
| |
| for (i = 1; i <= sdev->device->phys_port_cnt; i++) { |
| sport = &sdev->port[i - 1]; |
| WARN_ON(sport->port != i); |
| if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) |
| pr_err("disabling MAD processing failed.\n"); |
| if (sport->mad_agent) { |
| ib_unregister_mad_agent(sport->mad_agent); |
| sport->mad_agent = NULL; |
| } |
| } |
| } |
| |
| /** |
| * srpt_alloc_ioctx - allocate a SRPT I/O context structure |
| * @sdev: SRPT HCA pointer. |
| * @ioctx_size: I/O context size. |
| * @buf_cache: I/O buffer cache. |
| * @dir: DMA data direction. |
| */ |
| static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, |
| int ioctx_size, |
| struct kmem_cache *buf_cache, |
| enum dma_data_direction dir) |
| { |
| struct srpt_ioctx *ioctx; |
| |
| ioctx = kzalloc(ioctx_size, GFP_KERNEL); |
| if (!ioctx) |
| goto err; |
| |
| ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL); |
| if (!ioctx->buf) |
| goto err_free_ioctx; |
| |
| ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, |
| kmem_cache_size(buf_cache), dir); |
| if (ib_dma_mapping_error(sdev->device, ioctx->dma)) |
| goto err_free_buf; |
| |
| return ioctx; |
| |
| err_free_buf: |
| kmem_cache_free(buf_cache, ioctx->buf); |
| err_free_ioctx: |
| kfree(ioctx); |
| err: |
| return NULL; |
| } |
| |
| /** |
| * srpt_free_ioctx - free a SRPT I/O context structure |
| * @sdev: SRPT HCA pointer. |
| * @ioctx: I/O context pointer. |
| * @buf_cache: I/O buffer cache. |
| * @dir: DMA data direction. |
| */ |
| static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, |
| struct kmem_cache *buf_cache, |
| enum dma_data_direction dir) |
| { |
| if (!ioctx) |
| return; |
| |
| ib_dma_unmap_single(sdev->device, ioctx->dma, |
| kmem_cache_size(buf_cache), dir); |
| kmem_cache_free(buf_cache, ioctx->buf); |
| kfree(ioctx); |
| } |
| |
| /** |
| * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures |
| * @sdev: Device to allocate the I/O context ring for. |
| * @ring_size: Number of elements in the I/O context ring. |
| * @ioctx_size: I/O context size. |
| * @buf_cache: I/O buffer cache. |
| * @alignment_offset: Offset in each ring buffer at which the SRP information |
| * unit starts. |
| * @dir: DMA data direction. |
| */ |
| static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, |
| int ring_size, int ioctx_size, |
| struct kmem_cache *buf_cache, |
| int alignment_offset, |
| enum dma_data_direction dir) |
| { |
| struct srpt_ioctx **ring; |
| int i; |
| |
| WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) && |
| ioctx_size != sizeof(struct srpt_send_ioctx)); |
| |
| ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL); |
| if (!ring) |
| goto out; |
| for (i = 0; i < ring_size; ++i) { |
| ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir); |
| if (!ring[i]) |
| goto err; |
| ring[i]->index = i; |
| ring[i]->offset = alignment_offset; |
| } |
| goto out; |
| |
| err: |
| while (--i >= 0) |
| srpt_free_ioctx(sdev, ring[i], buf_cache, dir); |
| kvfree(ring); |
| ring = NULL; |
| out: |
| return ring; |
| } |
| |
| /** |
| * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures |
| * @ioctx_ring: I/O context ring to be freed. |
| * @sdev: SRPT HCA pointer. |
| * @ring_size: Number of ring elements. |
| * @buf_cache: I/O buffer cache. |
| * @dir: DMA data direction. |
| */ |
| static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, |
| struct srpt_device *sdev, int ring_size, |
| struct kmem_cache *buf_cache, |
| enum dma_data_direction dir) |
| { |
| int i; |
| |
| if (!ioctx_ring) |
| return; |
| |
| for (i = 0; i < ring_size; ++i) |
| srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir); |
| kvfree(ioctx_ring); |
| } |
| |
| /** |
| * srpt_set_cmd_state - set the state of a SCSI command |
| * @ioctx: Send I/O context. |
| * @new: New I/O context state. |
| * |
| * Does not modify the state of aborted commands. Returns the previous command |
| * state. |
| */ |
| static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, |
| enum srpt_command_state new) |
| { |
| enum srpt_command_state previous; |
| |
| previous = ioctx->state; |
| if (previous != SRPT_STATE_DONE) |
| ioctx->state = new; |
| |
| return previous; |
| } |
| |
| /** |
| * srpt_test_and_set_cmd_state - test and set the state of a command |
| * @ioctx: Send I/O context. |
| * @old: Current I/O context state. |
| * @new: New I/O context state. |
| * |
| * Returns true if and only if the previous command state was equal to 'old'. |
| */ |
| static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, |
| enum srpt_command_state old, |
| enum srpt_command_state new) |
| { |
| enum srpt_command_state previous; |
| |
| WARN_ON(!ioctx); |
| WARN_ON(old == SRPT_STATE_DONE); |
| WARN_ON(new == SRPT_STATE_NEW); |
| |
| previous = ioctx->state; |
| if (previous == old) |
| ioctx->state = new; |
| |
| return previous == old; |
| } |
| |
| /** |
| * srpt_post_recv - post an IB receive request |
| * @sdev: SRPT HCA pointer. |
| * @ch: SRPT RDMA channel. |
| * @ioctx: Receive I/O context pointer. |
| */ |
| static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch, |
| struct srpt_recv_ioctx *ioctx) |
| { |
| struct ib_sge list; |
| struct ib_recv_wr wr; |
| BAD_WR_MODIFIER struct ib_recv_wr *bad_wr; |
| |
| BUG_ON(!sdev); |
| wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index); |
| |
| list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset; |
| list.length = srp_max_req_size; |
| list.lkey = sdev->lkey; |
| |
| wr.next = NULL; |
| wr.sg_list = &list; |
| wr.num_sge = 1; |
| |
| if (sdev->use_srq) |
| return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); |
| else |
| return ib_post_recv(ch->qp, &wr, &bad_wr); |
| } |
| |
| static int srpt_adjust_sq_wr_avail(struct srpt_rdma_ch *ch, int delta) |
| { |
| return atomic_add_return(delta, &ch->sq_wr_avail); |
| } |
| |
| /** |
| * srpt_post_send - post an IB send request |
| * @ch: SRPT RDMA channel. |
| * @ioctx: I/O context. |
| * @len: Length in bytes of request to send. |
| * |
| * Returns zero upon success and a non-zero value upon failure. |
| */ |
| static int srpt_post_send(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, int len) |
| { |
| struct ib_sge list; |
| struct ib_send_wr wr; |
| BAD_WR_MODIFIER struct ib_send_wr *bad_wr; |
| struct srpt_device *sdev = ch->sport->sdev; |
| int ret; |
| |
| ret = -ENOMEM; |
| if (srpt_adjust_sq_wr_avail(ch, -1) < 0) { |
| pr_warn("ch %s-%d send queue full (needed 1)\n", ch->sess_name, |
| ch->qp->qp_num); |
| goto out; |
| } |
| |
| ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len, |
| DMA_TO_DEVICE); |
| |
| list.addr = ioctx->ioctx.dma; |
| list.length = len; |
| list.lkey = sdev->lkey; |
| |
| wr.next = NULL; |
| wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index); |
| wr.sg_list = &list; |
| wr.num_sge = 1; |
| wr.opcode = IB_WR_SEND; |
| wr.send_flags = IB_SEND_SIGNALED; |
| |
| ret = ib_post_send(ch->qp, &wr, &bad_wr); |
| |
| out: |
| if (ret < 0) |
| srpt_adjust_sq_wr_avail(ch, 1); |
| return ret; |
| } |
| |
| /** |
| * srpt_zerolength_write - perform a zero-length RDMA write |
| * @ch: SRPT RDMA channel. |
| * |
| * A quote from the InfiniBand specification: C9-88: For an HCA responder |
| * using Reliable Connection service, for each zero-length RDMA READ or WRITE |
| * request, the R_Key shall not be validated, even if the request includes |
| * Immediate data. |
| */ |
| static int srpt_zerolength_write(struct srpt_rdma_ch *ch) |
| { |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| struct ib_send_wr wr; |
| #else |
| struct ib_rdma_wr wr; |
| #endif |
| BAD_WR_MODIFIER struct ib_send_wr *bad_wr; |
| |
| memset(&wr, 0, sizeof(wr)); |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| wr.opcode = IB_WR_RDMA_WRITE; |
| wr.wr_id = encode_wr_id(SRPT_RDMA_ZEROLENGTH_WRITE, 0xffffffffUL); |
| wr.send_flags = IB_SEND_SIGNALED; |
| return ib_post_send(ch->qp, &wr, &bad_wr); |
| #else |
| wr.wr.opcode = IB_WR_RDMA_WRITE; |
| wr.wr.wr_id = encode_wr_id(SRPT_RDMA_ZEROLENGTH_WRITE, 0xffffffffUL); |
| wr.wr.send_flags = IB_SEND_SIGNALED; |
| return ib_post_send(ch->qp, &wr.wr, &bad_wr); |
| #endif |
| } |
| |
| static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd) |
| { |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) |
| /* |
| * The pointer computations below will only be compiled correctly |
| * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check |
| * whether srp_cmd::add_data has been declared as a byte pointer. |
| */ |
| BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) && |
| !__same_type(srp_cmd->add_data[0], (u8)0)); |
| #endif |
| |
| /* |
| * According to the SRP spec, the lower two bits of the 'ADDITIONAL |
| * CDB LENGTH' field are reserved and the size in bytes of this field |
| * is four times the value specified in bits 3..7. Hence the "& ~3". |
| */ |
| return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3); |
| } |
| |
| /** |
| * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request |
| * @recv_ioctx: I/O context associated with the received command @srp_cmd. |
| * @ioctx: I/O context that will be used for responding to the initiator. |
| * @srp_cmd: Pointer to the SRP_CMD request data. |
| * @dir: Pointer to the variable to which the transfer direction will be |
| * written. |
| * @data_len: Pointer to the variable to which the total data length of all |
| * descriptors in the SRP_CMD request will be written. |
| * @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data |
| * starts. |
| * |
| * This function initializes ioctx->nrbuf and ioctx->r_bufs. |
| * |
| * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; |
| * -ENOMEM when memory allocation fails and zero upon success. |
| */ |
| static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx, |
| struct srpt_send_ioctx *ioctx, |
| struct srp_cmd *srp_cmd, |
| scst_data_direction *dir, u64 *data_len, |
| u16 imm_data_offset) |
| { |
| u8 fmt; |
| |
| BUG_ON(!dir); |
| BUG_ON(!data_len); |
| |
| *data_len = 0; |
| |
| /* |
| * The lower four bits of the buffer format field contain the DATA-IN |
| * buffer descriptor format, and the highest four bits contain the |
| * DATA-OUT buffer descriptor format. |
| */ |
| fmt = srp_cmd->buf_fmt; |
| if (fmt & 0xf) { |
| /* DATA-IN: transfer data from target to initiator (read). */ |
| *dir = SCST_DATA_READ; |
| fmt = fmt & 0xf; |
| } else if (fmt >> 4) { |
| /* DATA-OUT: transfer data from initiator to target (write). */ |
| *dir = SCST_DATA_WRITE; |
| fmt = fmt >> 4; |
| } else { |
| *dir = SCST_DATA_NONE; |
| } |
| |
| if (fmt == SRP_DATA_DESC_DIRECT) { |
| struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd); |
| |
| ioctx->n_rbuf = 1; |
| ioctx->rbufs = &ioctx->single_rbuf; |
| |
| memcpy(ioctx->rbufs, db, sizeof(*db)); |
| *data_len = be32_to_cpu(db->len); |
| return 0; |
| } else if (fmt == SRP_DATA_DESC_INDIRECT) { |
| struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd); |
| struct srp_direct_buf *db; |
| |
| ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof(*db); |
| |
| if (ioctx->n_rbuf > |
| (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { |
| pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n", |
| srp_cmd->data_out_desc_cnt, |
| srp_cmd->data_in_desc_cnt, |
| be32_to_cpu(idb->table_desc.len), |
| sizeof(struct srp_direct_buf)); |
| ioctx->n_rbuf = 0; |
| return -EINVAL; |
| } |
| |
| if (ioctx->n_rbuf == 1) |
| ioctx->rbufs = &ioctx->single_rbuf; |
| else { |
| ioctx->rbufs = kmalloc_array(ioctx->n_rbuf, |
| sizeof(*db), GFP_ATOMIC); |
| if (!ioctx->rbufs) { |
| ioctx->n_rbuf = 0; |
| return -ENOMEM; |
| } |
| } |
| |
| db = idb->desc_list; |
| memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof(*db)); |
| *data_len = be32_to_cpu(idb->len); |
| return 0; |
| } else if (fmt == SRP_DATA_DESC_IMM) { |
| struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd); |
| void *data = (void *)srp_cmd + imm_data_offset; |
| uint32_t len = be32_to_cpu(imm_buf->len); |
| uint32_t req_size = imm_data_offset + len; |
| |
| if (req_size > srp_max_req_size) { |
| pr_err("Immediate data (length %d + %d) exceeds request size %d\n", |
| imm_data_offset, len, srp_max_req_size); |
| return -EINVAL; |
| } |
| if (recv_ioctx->byte_len < req_size) { |
| pr_err("Received too few data - %d < %d\n", |
| recv_ioctx->byte_len, req_size); |
| return -EIO; |
| } |
| /* |
| * The immediate data buffer descriptor must occur before the |
| * immediate data itself. |
| */ |
| if ((void *)(imm_buf + 1) > (void *)data) { |
| pr_err("Received invalid write request\n"); |
| return -EINVAL; |
| } |
| *data_len = len; |
| ioctx->recv_ioctx = recv_ioctx; |
| if ((uintptr_t)data & 511) { |
| pr_warn_once("Internal error - the receive buffers are not aligned properly.\n"); |
| return -EINVAL; |
| } |
| /* Note: this sg entry may span more than one physical page. */ |
| sg_init_one(&ioctx->imm_sg, data, len); |
| scst_cmd_set_tgt_sg(&ioctx->cmd, &ioctx->imm_sg, 1); |
| return 0; |
| } else if (fmt != 0) { |
| pr_err("Unsupported data format %d\n\n", fmt); |
| return -EINVAL; |
| } else { |
| *data_len = 0; |
| return 0; |
| } |
| } |
| |
| /** |
| * srpt_init_ch_qp - initialize queue pair attributes |
| * @ch: SRPT RDMA channel. |
| * @qp: Queue pair pointer. |
| * |
| * Initialized the attributes of queue pair 'qp' by allowing local write, |
| * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. |
| */ |
| static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
| { |
| struct ib_qp_attr *attr; |
| int ret; |
| |
| WARN_ON_ONCE(ch->using_rdma_cm); |
| |
| attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| if (!attr) |
| return -ENOMEM; |
| |
| attr->qp_state = IB_QPS_INIT; |
| attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
| attr->port_num = ch->sport->port; |
| |
| ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port, |
| ch->pkey, &attr->pkey_index); |
| if (ret < 0) |
| pr_err("Translating pkey %#x failed (%d) - using index 0\n", |
| ch->pkey, ret); |
| |
| ret = ib_modify_qp(qp, attr, |
| IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | |
| IB_QP_PKEY_INDEX); |
| |
| kfree(attr); |
| return ret; |
| } |
| |
| /** |
| * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR) |
| * @ch: channel of the queue pair. |
| * @qp: queue pair to change the state of. |
| * |
| * Returns zero upon success and a negative value upon failure. |
| */ |
| static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
| { |
| struct ib_qp_attr *attr; |
| int attr_mask; |
| int ret; |
| |
| WARN_ON_ONCE(ch->using_rdma_cm); |
| |
| attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| if (!attr) |
| return -ENOMEM; |
| |
| attr->qp_state = IB_QPS_RTR; |
| ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, attr, &attr_mask); |
| if (ret) |
| goto out; |
| |
| attr->max_dest_rd_atomic = 4; |
| |
| ret = ib_modify_qp(qp, attr, attr_mask); |
| |
| out: |
| kfree(attr); |
| return ret; |
| } |
| |
| /** |
| * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS) |
| * @ch: channel of the queue pair. |
| * @qp: queue pair to change the state of. |
| * |
| * Returns zero upon success and a negative value upon failure. |
| */ |
| static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
| { |
| struct ib_qp_attr *attr; |
| int attr_mask; |
| int ret; |
| |
| WARN_ON_ONCE(ch->using_rdma_cm); |
| |
| attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| if (!attr) |
| return -ENOMEM; |
| |
| attr->qp_state = IB_QPS_RTS; |
| ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, attr, &attr_mask); |
| if (ret) |
| goto out; |
| |
| attr->max_rd_atomic = 4; |
| |
| ret = ib_modify_qp(qp, attr, attr_mask); |
| |
| out: |
| kfree(attr); |
| return ret; |
| } |
| |
| /** |
| * srpt_ch_qp_err - set the channel queue pair state to 'error' |
| * @ch: SRPT RDMA channel. |
| */ |
| static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) |
| { |
| struct ib_qp_attr *attr; |
| int ret; |
| |
| attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| if (!attr) |
| return -ENOMEM; |
| |
| attr->qp_state = IB_QPS_ERR; |
| ret = ib_modify_qp(ch->qp, attr, IB_QP_STATE); |
| kfree(attr); |
| return ret; |
| } |
| |
| /** |
| * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator |
| * @ch: SRPT RDMA channel. |
| */ |
| static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) |
| { |
| struct srpt_send_ioctx *ioctx; |
| unsigned long flags; |
| |
| BUG_ON(!ch); |
| |
| ioctx = NULL; |
| spin_lock_irqsave(&ch->spinlock, flags); |
| if (!list_empty(&ch->free_list)) { |
| ioctx = list_first_entry(&ch->free_list, |
| struct srpt_send_ioctx, free_list); |
| list_del(&ioctx->free_list); |
| } |
| spin_unlock_irqrestore(&ch->spinlock, flags); |
| |
| if (!ioctx) |
| return ioctx; |
| |
| BUG_ON(ioctx->ch != ch); |
| ioctx->state = SRPT_STATE_NEW; |
| EXTRACHECKS_WARN_ON(ioctx->recv_ioctx); |
| ioctx->n_rbuf = 0; |
| ioctx->rbufs = NULL; |
| ioctx->n_rdma = 0; |
| ioctx->n_rdma_ius = 0; |
| ioctx->rdma_ius = NULL; |
| ioctx->mapped_sg_count = 0; |
| memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); |
| |
| return ioctx; |
| } |
| |
| /** |
| * srpt_put_send_ioctx() - free up resources |
| * @ioctx: I/O context to free. |
| */ |
| static void srpt_put_send_ioctx(struct srpt_send_ioctx *ioctx) |
| { |
| struct srpt_rdma_ch *ch = ioctx->ch; |
| struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx; |
| unsigned long flags; |
| |
| if (recv_ioctx) { |
| EXTRACHECKS_WARN_ON(!list_empty(&recv_ioctx->wait_list)); |
| ioctx->recv_ioctx = NULL; |
| srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
| } |
| |
| /* |
| * If the WARN_ON() below gets triggered this means that |
| * srpt_unmap_sg_to_ib_sge() has not been called. |
| */ |
| WARN_ON(ioctx->mapped_sg_count); |
| |
| if (ioctx->n_rbuf > 1) { |
| kfree(ioctx->rbufs); |
| ioctx->rbufs = NULL; |
| ioctx->n_rbuf = 0; |
| } |
| |
| spin_lock_irqsave(&ch->spinlock, flags); |
| list_add(&ioctx->free_list, &ch->free_list); |
| spin_unlock_irqrestore(&ch->spinlock, flags); |
| } |
| |
| /** |
| * srpt_abort_cmd - abort a SCSI command |
| * @ioctx: I/O context associated with the SCSI command. |
| * @context: Preferred execution context. |
| * |
| * Must only be called when the I/O context is in a state where it is waiting |
| * for the HCA. |
| */ |
| static void srpt_abort_cmd(struct srpt_send_ioctx *ioctx, |
| enum scst_exec_context context) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| enum srpt_command_state state = ioctx->state; |
| |
| switch (state) { |
| case SRPT_STATE_NEED_DATA: |
| ioctx->state = SRPT_STATE_DATA_IN; |
| break; |
| case SRPT_STATE_CMD_RSP_SENT: |
| case SRPT_STATE_MGMT_RSP_SENT: |
| ioctx->state = SRPT_STATE_DONE; |
| break; |
| default: |
| WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
| __func__, state); |
| break; |
| } |
| |
| WARN_ON(ioctx != scst_cmd_get_tgt_priv(cmd)); |
| |
| pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state, |
| ioctx->state, scst_cmd_get_tag(cmd)); |
| |
| switch (state) { |
| case SRPT_STATE_NEW: |
| case SRPT_STATE_DATA_IN: |
| case SRPT_STATE_MGMT: |
| case SRPT_STATE_DONE: |
| /* |
| * Do nothing - defer abort processing until |
| * srpt_queue_response() is invoked. |
| */ |
| break; |
| case SRPT_STATE_NEED_DATA: |
| pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
| scst_set_cmd_error(cmd, |
| SCST_LOAD_SENSE(scst_sense_write_error)); |
| scst_rx_data(cmd, SCST_RX_STATUS_ERROR_SENSE_SET, context); |
| break; |
| case SRPT_STATE_CMD_RSP_SENT: |
| /* |
| * SRP_RSP sending failed or the SRP_RSP send completion has |
| * not been received in time. |
| */ |
| srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); |
| scst_set_delivery_status(cmd, SCST_CMD_DELIVERY_ABORTED); |
| scst_tgt_cmd_done(cmd, context); |
| break; |
| case SRPT_STATE_MGMT_RSP_SENT: |
| /* |
| * Management command response sending failed. This state is |
| * never reached since there is no cmd associated with |
| * management commands. Note: the SCST core frees these |
| * commands immediately after srpt_tsk_mgmt_done() returned. |
| */ |
| WARN(true, "Unexpected command state %d\n", state); |
| break; |
| } |
| } |
| |
| /* |
| * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion. |
| */ |
| static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id, |
| enum scst_exec_context context) |
| { |
| u32 index = idx_from_wr_id(wr_id); |
| struct srpt_send_ioctx *ioctx = ch->ioctx_ring[index]; |
| struct scst_cmd *cmd = &ioctx->cmd; |
| enum srpt_command_state state = ioctx->state; |
| int wr_avail_delta = 1; |
| |
| switch (state) { |
| case SRPT_STATE_NEED_DATA: |
| srpt_abort_cmd(ioctx, context); |
| break; |
| case SRPT_STATE_CMD_RSP_SENT: |
| if (scst_cmd_get_data_direction(cmd) == SCST_DATA_READ) { |
| /* |
| * IB_SEND_SIGNALED is not set for RDMA writes so |
| * process the wr_avail delta when the response |
| * send completion has been received. |
| */ |
| EXTRACHECKS_WARN_ON(ioctx->n_rdma <= 0); |
| wr_avail_delta += ioctx->n_rdma; |
| } |
| srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta); |
| srpt_abort_cmd(ioctx, context); |
| break; |
| case SRPT_STATE_MGMT_RSP_SENT: |
| srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta); |
| srpt_put_send_ioctx(ioctx); |
| break; |
| case SRPT_STATE_DONE: |
| pr_err("Received more than one IB error completion for wr_id = %u.\n", |
| index); |
| break; |
| default: |
| EXTRACHECKS_WARN_ON(true); |
| break; |
| } |
| |
| srpt_adjust_sq_wr_avail(ch, wr_avail_delta); |
| } |
| |
| /* |
| * srpt_handle_send_comp() - Process an IB send completion notification. |
| */ |
| static void srpt_handle_send_comp(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| enum scst_exec_context context) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| int wr_avail_delta = 1; |
| |
| switch (srpt_set_cmd_state(ioctx, SRPT_STATE_DONE)) { |
| case SRPT_STATE_CMD_RSP_SENT: |
| if (scst_cmd_get_data_direction(cmd) == SCST_DATA_READ) { |
| /* |
| * IB_SEND_SIGNALED is not set for RDMA writes so |
| * process the wr_avail delta when the response |
| * send completion has been received. |
| */ |
| EXTRACHECKS_WARN_ON(ioctx->n_rdma <= 0); |
| wr_avail_delta += ioctx->n_rdma; |
| } |
| srpt_unmap_sg_to_ib_sge(ch, ioctx); |
| scst_tgt_cmd_done(&ioctx->cmd, context); |
| break; |
| case SRPT_STATE_MGMT_RSP_SENT: |
| srpt_put_send_ioctx(ioctx); |
| break; |
| case SRPT_STATE_DONE: |
| pr_err("IB completion has been received too late for wr_id = %u.\n", |
| ioctx->ioctx.index); |
| break; |
| default: |
| EXTRACHECKS_WARN_ON(true); |
| } |
| |
| srpt_adjust_sq_wr_avail(ch, wr_avail_delta); |
| } |
| |
| /* |
| * srpt_handle_rdma_comp() - Process an IB RDMA completion notification. |
| */ |
| static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| enum srpt_opcode opcode, |
| enum scst_exec_context context) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| |
| if (opcode == SRPT_RDMA_READ_LAST) { |
| EXTRACHECKS_WARN_ON(ioctx->n_rdma <= 0); |
| srpt_adjust_sq_wr_avail(ch, ioctx->n_rdma); |
| if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, |
| SRPT_STATE_DATA_IN)) |
| scst_rx_data(cmd, SCST_RX_STATUS_SUCCESS, context); |
| else |
| pr_err("%s: wrong ioctx state %d\n", __func__, |
| ioctx->state); |
| } else if (opcode == SRPT_RDMA_ABORT) { |
| ioctx->rdma_aborted = true; |
| } else { |
| WARN(true, "Unexpected RDMA opcode %d\n", opcode); |
| } |
| } |
| |
| /* |
| * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion. |
| */ |
| static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| enum srpt_opcode opcode, |
| enum scst_exec_context context) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| enum srpt_command_state state = ioctx->state; |
| |
| switch (opcode) { |
| case SRPT_RDMA_READ_LAST: |
| if (ioctx->n_rdma <= 0) { |
| pr_err("Received invalid RDMA read error completion with idx %d\n", |
| ioctx->ioctx.index); |
| break; |
| } |
| srpt_adjust_sq_wr_avail(ch, ioctx->n_rdma); |
| if (state == SRPT_STATE_NEED_DATA) |
| srpt_abort_cmd(ioctx, context); |
| else |
| pr_err("%s: wrong ioctx state %d\n", __func__, state); |
| break; |
| case SRPT_RDMA_WRITE_LAST: |
| /* |
| * Note: if an RDMA write error completion is received that |
| * means that a SEND also has been posted. Defer further |
| * processing of the associated command until the send error |
| * completion has been received. |
| */ |
| scst_set_delivery_status(cmd, SCST_CMD_DELIVERY_ABORTED); |
| break; |
| default: |
| pr_err("%s: opcode %u\n", __func__, opcode); |
| break; |
| } |
| } |
| |
| /** |
| * srpt_build_cmd_rsp - build a SRP_RSP response |
| * @ch: RDMA channel through which the request has been received. |
| * @ioctx: I/O context associated with the SRP_CMD request. The response will |
| * be built in the buffer ioctx->buf points at and hence this function will |
| * overwrite the request data. |
| * @tag: tag of the request for which this response is being generated. |
| * @status: value for the STATUS field of the SRP_RSP information unit. |
| * @sense_data: pointer to sense data to be included in the response. |
| * @sense_data_len: length in bytes of the sense data. |
| * |
| * Returns the size in bytes of the SRP_RSP response. |
| * |
| * An SRP_RSP response contains a SCSI status or service response. See also |
| * section 6.9 in the SRP r16a document for the format of an SRP_RSP |
| * response. See also SPC-2 for more information about sense data. |
| */ |
| static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, u64 tag, |
| int status, const u8 *sense_data, |
| int sense_data_len) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| struct srp_rsp *srp_rsp; |
| int resid, max_sense_len; |
| |
| /* |
| * The lowest bit of all SAM-3 status codes is zero (see also |
| * paragraph 5.3 in SAM-3). |
| */ |
| EXTRACHECKS_WARN_ON(status & 1); |
| |
| srp_rsp = ioctx->ioctx.buf; |
| BUG_ON(!srp_rsp); |
| memset(srp_rsp, 0, sizeof(*srp_rsp)); |
| |
| srp_rsp->opcode = SRP_RSP; |
| srp_rsp->req_lim_delta = cpu_to_be32(ioctx->req_lim_delta); |
| srp_rsp->tag = tag; |
| srp_rsp->status = status; |
| |
| if (unlikely(scst_get_resid(cmd, &resid, NULL) && resid != 0)) { |
| if (scst_cmd_get_data_direction(cmd) & SCST_DATA_READ) { |
| if (resid > 0) |
| srp_rsp->flags |= SRP_RSP_FLAG_DIUNDER; |
| else if (resid < 0) |
| srp_rsp->flags |= SRP_RSP_FLAG_DIOVER; |
| srp_rsp->data_in_res_cnt = cpu_to_be32(abs(resid)); |
| } |
| if (scst_cmd_get_data_direction(cmd) & SCST_DATA_WRITE) { |
| if (resid > 0) |
| srp_rsp->flags |= SRP_RSP_FLAG_DOUNDER; |
| else if (resid < 0) |
| srp_rsp->flags |= SRP_RSP_FLAG_DOOVER; |
| srp_rsp->data_out_res_cnt = cpu_to_be32(abs(resid)); |
| } |
| } |
| |
| if (!scst_sense_valid(sense_data)) { |
| sense_data_len = 0; |
| } else { |
| BUILD_BUG_ON(sizeof(*srp_rsp) >= MIN_MAX_RSP_SIZE); |
| max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); |
| if (sense_data_len > max_sense_len) { |
| pr_warn("truncated sense data from %d to %d bytes\n", |
| sense_data_len, max_sense_len); |
| sense_data_len = max_sense_len; |
| } |
| |
| srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; |
| srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); |
| memcpy(srp_rsp + 1, sense_data, sense_data_len); |
| } |
| |
| return sizeof(*srp_rsp) + sense_data_len; |
| } |
| |
| /** |
| * srpt_build_tskmgmt_rsp - build a task management response |
| * @ch: RDMA channel through which the request has been received. |
| * @ioctx: I/O context in which the SRP_RSP response will be built. |
| * @rsp_code: RSP_CODE that will be stored in the response. |
| * @tag: Tag of the request for which this response is being generated. |
| * |
| * Returns the size in bytes of the SRP_RSP response. |
| * |
| * An SRP_RSP response contains a SCSI status or service response. See also |
| * section 6.9 in the SRP r16a document for the format of an SRP_RSP |
| * response. |
| */ |
| static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| u8 rsp_code, u64 tag) |
| { |
| struct srp_rsp *srp_rsp; |
| int resp_data_len; |
| int resp_len; |
| |
| resp_data_len = 4; |
| resp_len = sizeof(*srp_rsp) + resp_data_len; |
| |
| srp_rsp = ioctx->ioctx.buf; |
| BUG_ON(!srp_rsp); |
| memset(srp_rsp, 0, sizeof(*srp_rsp)); |
| |
| srp_rsp->opcode = SRP_RSP; |
| srp_rsp->req_lim_delta = cpu_to_be32(ioctx->req_lim_delta); |
| srp_rsp->tag = tag; |
| |
| srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
| srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); |
| srp_rsp->data[3] = rsp_code; |
| |
| return resp_len; |
| } |
| |
| /** |
| * srpt_handle_cmd - process a SRP_CMD information unit |
| * @ch: SRPT RDMA channel. |
| * @recv_ioctx: Receive I/O context. |
| * @send_ioctx: Send I/O context. |
| * @context: SCST command processing context. |
| */ |
| static int srpt_handle_cmd(struct srpt_rdma_ch *ch, |
| struct srpt_recv_ioctx *recv_ioctx, |
| struct srpt_send_ioctx *send_ioctx, |
| enum scst_exec_context context) |
| { |
| struct scst_cmd *cmd; |
| struct srp_cmd *srp_cmd; |
| scst_data_direction dir; |
| u64 data_len; |
| int ret; |
| |
| BUG_ON(!send_ioctx); |
| |
| srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
| |
| cmd = &send_ioctx->cmd; |
| ret = scst_rx_cmd_prealloced(cmd, ch->sess, (u8 *) &srp_cmd->lun, |
| sizeof(srp_cmd->lun), srp_cmd->cdb, |
| sizeof(srp_cmd->cdb), in_interrupt()); |
| if (ret) { |
| pr_err("tag 0x%llx: SCST command initialization failed\n", |
| srp_cmd->tag); |
| goto err; |
| } |
| |
| ret = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir, |
| &data_len, ch->imm_data_offset); |
| if (ret) { |
| pr_err("0x%llx: parsing SRP descriptor table failed.\n", |
| srp_cmd->tag); |
| scst_set_cmd_error(cmd, |
| SCST_LOAD_SENSE(scst_sense_invalid_field_in_cdb)); |
| } |
| |
| switch (srp_cmd->task_attr) { |
| case SRP_CMD_HEAD_OF_Q: |
| scst_cmd_set_queue_type(cmd, SCST_CMD_QUEUE_HEAD_OF_QUEUE); |
| break; |
| case SRP_CMD_ORDERED_Q: |
| scst_cmd_set_queue_type(cmd, SCST_CMD_QUEUE_ORDERED); |
| break; |
| case SRP_CMD_SIMPLE_Q: |
| scst_cmd_set_queue_type(cmd, SCST_CMD_QUEUE_SIMPLE); |
| break; |
| case SRP_CMD_ACA: |
| scst_cmd_set_queue_type(cmd, SCST_CMD_QUEUE_ACA); |
| break; |
| default: |
| scst_cmd_set_queue_type(cmd, SCST_CMD_QUEUE_ORDERED); |
| break; |
| } |
| |
| scst_cmd_set_tag(cmd, srp_cmd->tag); |
| scst_cmd_set_tgt_priv(cmd, send_ioctx); |
| scst_cmd_set_expected(cmd, dir, data_len); |
| scst_cmd_init_done(cmd, context); |
| |
| return 0; |
| |
| err: |
| srpt_put_send_ioctx(send_ioctx); |
| return -1; |
| } |
| |
| /** |
| * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit |
| * @ch: SRPT RDMA channel. |
| * @recv_ioctx: Receive I/O context. |
| * @send_ioctx: Send I/O context. |
| * |
| * Each task management function is performed by calling one of the |
| * scst_rx_mgmt_fn*() functions. These functions will either report failure |
| * or process the task management function asynchronously. The function |
| * srpt_tsk_mgmt_done() will be called by the SCST core upon completion of the |
| * task management function. When srpt_handle_tsk_mgmt() reports failure |
| * (i.e. returns -1) a response will have been built in ioctx->buf. This |
| * information unit has to be sent back by the caller. |
| * |
| * For more information about SRP_TSK_MGMT information units, see also section |
| * 6.7 in the SRP r16a document. |
| */ |
| static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, |
| struct srpt_recv_ioctx *recv_ioctx, |
| struct srpt_send_ioctx *send_ioctx) |
| { |
| struct srp_tsk_mgmt *srp_tsk; |
| int ret; |
| |
| ret = -EOPNOTSUPP; |
| |
| BUG_ON(!send_ioctx); |
| BUG_ON(send_ioctx->ch != ch); |
| |
| srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); |
| |
| srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
| |
| pr_debug("recv_tsk_mgmt= %d for task_tag= %lld using tag= %lld ch= %p sess= %p\n", |
| srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, |
| ch, ch->sess); |
| |
| send_ioctx->tsk_mgmt.tag = srp_tsk->tag; |
| |
| switch (srp_tsk->tsk_mgmt_func) { |
| case SRP_TSK_ABORT_TASK: |
| pr_debug("Processing SRP_TSK_ABORT_TASK\n"); |
| ret = scst_rx_mgmt_fn_tag(ch->sess, SCST_ABORT_TASK, |
| srp_tsk->task_tag, |
| in_interrupt(), send_ioctx); |
| break; |
| case SRP_TSK_ABORT_TASK_SET: |
| pr_debug("Processing SRP_TSK_ABORT_TASK_SET\n"); |
| ret = scst_rx_mgmt_fn_lun(ch->sess, SCST_ABORT_TASK_SET, |
| &srp_tsk->lun, sizeof(srp_tsk->lun), |
| in_interrupt(), send_ioctx); |
| break; |
| case SRP_TSK_CLEAR_TASK_SET: |
| pr_debug("Processing SRP_TSK_CLEAR_TASK_SET\n"); |
| ret = scst_rx_mgmt_fn_lun(ch->sess, SCST_CLEAR_TASK_SET, |
| &srp_tsk->lun, sizeof(srp_tsk->lun), |
| in_interrupt(), send_ioctx); |
| break; |
| case SRP_TSK_LUN_RESET: |
| pr_debug("Processing SRP_TSK_LUN_RESET\n"); |
| ret = scst_rx_mgmt_fn_lun(ch->sess, SCST_LUN_RESET, |
| &srp_tsk->lun, sizeof(srp_tsk->lun), |
| in_interrupt(), send_ioctx); |
| break; |
| case SRP_TSK_CLEAR_ACA: |
| pr_debug("Processing SRP_TSK_CLEAR_ACA\n"); |
| ret = scst_rx_mgmt_fn_lun(ch->sess, SCST_CLEAR_ACA, |
| &srp_tsk->lun, sizeof(srp_tsk->lun), |
| in_interrupt(), send_ioctx); |
| break; |
| default: |
| pr_debug("Unsupported task management function.\n"); |
| } |
| |
| if (ret != 0) { |
| pr_err("Processing task management function %d failed: %d\n", |
| srp_tsk->tsk_mgmt_func, ret); |
| srpt_put_send_ioctx(send_ioctx); |
| } |
| } |
| |
| static u8 scst_to_srp_tsk_mgmt_status(const int scst_mgmt_status) |
| { |
| switch (scst_mgmt_status) { |
| case SCST_MGMT_STATUS_SUCCESS: |
| return SRP_TSK_MGMT_SUCCESS; |
| case SCST_MGMT_STATUS_FN_NOT_SUPPORTED: |
| return SRP_TSK_MGMT_FUNC_NOT_SUPP; |
| case SCST_MGMT_STATUS_TASK_NOT_EXIST: |
| case SCST_MGMT_STATUS_LUN_NOT_EXIST: |
| case SCST_MGMT_STATUS_REJECTED: |
| case SCST_MGMT_STATUS_FAILED: |
| default: |
| break; |
| } |
| return SRP_TSK_MGMT_FAILED; |
| } |
| |
| /** |
| * srpt_handle_new_iu - process a newly received information unit |
| * @ch: RDMA channel through which the information unit has been received. |
| * @recv_ioctx: Receive I/O context associated with the information unit. |
| * @context: SCST command processing context. |
| */ |
| static struct srpt_send_ioctx * |
| srpt_handle_new_iu(struct srpt_rdma_ch *ch, |
| struct srpt_recv_ioctx *recv_ioctx, |
| enum scst_exec_context context) |
| { |
| struct srpt_send_ioctx *send_ioctx = NULL; |
| struct srp_cmd *srp_cmd; |
| u8 opcode; |
| |
| BUG_ON(!ch); |
| BUG_ON(!recv_ioctx); |
| |
| if (unlikely(ch->state == CH_CONNECTING)) |
| goto push; |
| |
| ib_dma_sync_single_for_cpu(ch->sport->sdev->device, |
| recv_ioctx->ioctx.dma, |
| recv_ioctx->ioctx.offset + srp_max_req_size, |
| DMA_FROM_DEVICE); |
| |
| srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
| opcode = srp_cmd->opcode; |
| if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) { |
| send_ioctx = srpt_get_send_ioctx(ch); |
| if (unlikely(!send_ioctx)) |
| goto push; |
| } |
| |
| if (!list_empty(&recv_ioctx->wait_list)) { |
| WARN_ON_ONCE(!ch->processing_wait_list); |
| list_del_init(&recv_ioctx->wait_list); |
| } |
| |
| switch (opcode) { |
| case SRP_CMD: |
| srpt_handle_cmd(ch, recv_ioctx, send_ioctx, context); |
| break; |
| case SRP_TSK_MGMT: |
| srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); |
| break; |
| case SRP_I_LOGOUT: |
| pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
| break; |
| case SRP_CRED_RSP: |
| pr_debug("received SRP_CRED_RSP\n"); |
| break; |
| case SRP_AER_RSP: |
| pr_debug("received SRP_AER_RSP\n"); |
| break; |
| case SRP_RSP: |
| pr_err("Received SRP_RSP\n"); |
| break; |
| default: |
| pr_err("received IU with unknown opcode 0x%x\n", opcode); |
| break; |
| } |
| |
| if (!send_ioctx || !send_ioctx->recv_ioctx) |
| srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
| |
| out: |
| return send_ioctx; |
| |
| push: |
| if (list_empty(&recv_ioctx->wait_list)) { |
| WARN_ON_ONCE(ch->processing_wait_list); |
| list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); |
| } |
| goto out; |
| } |
| |
| static void srpt_process_rcv_completion(struct ib_cq *cq, |
| struct srpt_rdma_ch *ch, |
| struct ib_wc *wc) |
| { |
| struct srpt_recv_ioctx *ioctx; |
| u32 index; |
| |
| index = idx_from_wr_id(wc->wr_id); |
| if (wc->status == IB_WC_SUCCESS) { |
| int req_lim; |
| |
| req_lim = srpt_adjust_req_lim(ch, -1, 0); |
| if (unlikely(req_lim < 0)) |
| pr_err("req_lim = %d < 0\n", req_lim); |
| if (ch->sport->sdev->use_srq) |
| ioctx = ch->sport->sdev->ioctx_ring[index]; |
| else |
| ioctx = ch->ioctx_recv_ring[index]; |
| ioctx->byte_len = wc->byte_len; |
| srpt_handle_new_iu(ch, ioctx, srpt_new_iu_context); |
| } else if (ch->state <= CH_LIVE) { |
| pr_info("receiving failed for idx %u with status %d\n", index, |
| wc->status); |
| } |
| } |
| |
| /* |
| * This function must be called from the context in which RDMA completions are |
| * processed because it accesses the wait list without protection against |
| * access from other threads. |
| */ |
| static void srpt_process_wait_list(struct srpt_rdma_ch *ch) |
| { |
| struct srpt_recv_ioctx *recv_ioctx, *tmp; |
| |
| WARN_ON_ONCE(ch->state == CH_CONNECTING); |
| |
| if (list_empty(&ch->cmd_wait_list)) |
| return; |
| |
| WARN_ON_ONCE(ch->processing_wait_list); |
| ch->processing_wait_list = true; |
| list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list, |
| wait_list) { |
| if (!srpt_handle_new_iu(ch, recv_ioctx, srpt_new_iu_context)) |
| break; |
| } |
| ch->processing_wait_list = false; |
| } |
| |
| /* |
| * srpt_process_send_completion() - Process an IB send completion. |
| * |
| * Note: Although this has not yet been observed during tests, at least in |
| * theory it is possible that the srpt_get_send_ioctx() call invoked by |
| * srpt_handle_new_iu() fails. This is possible because the req_lim_delta |
| * value in each response is set to at least one, and it is possible that this |
| * response makes the initiator send a new request before the send completion |
| * for that response has been processed. This could e.g. happen if the call to |
| * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or |
| * if IB retransmission causes generation of the send completion to be |
| * delayed. Incoming information units for which srpt_get_send_ioctx() fails |
| * are queued on cmd_wait_list. The code below processes these delayed |
| * requests one at a time. |
| */ |
| static void srpt_process_send_completion(struct ib_cq *cq, |
| struct srpt_rdma_ch *ch, |
| struct ib_wc *wc) |
| { |
| uint32_t index; |
| enum srpt_opcode opcode; |
| |
| index = idx_from_wr_id(wc->wr_id); |
| opcode = opcode_from_wr_id(wc->wr_id); |
| if (wc->status == IB_WC_SUCCESS) { |
| if (opcode == SRPT_SEND) { |
| srpt_handle_send_comp(ch, ch->ioctx_ring[index], |
| srpt_send_context); |
| } else if (opcode == SRPT_RDMA_READ_LAST || |
| opcode == SRPT_RDMA_ABORT) { |
| srpt_handle_rdma_comp(ch, ch->ioctx_ring[index], opcode, |
| srpt_xmt_rsp_context); |
| } else if (opcode == SRPT_RDMA_ZEROLENGTH_WRITE) { |
| WARN_ONCE(ch->state != CH_LIVE, |
| "%s-%d: QP not in 'live' state\n", |
| ch->sess_name, ch->qp->qp_num); |
| srpt_process_wait_list(ch); |
| } else { |
| WARN(true, "unexpected opcode %d\n", opcode); |
| } |
| } else { |
| if (opcode == SRPT_SEND) { |
| pr_info("sending response for idx %u failed with status %d\n", |
| index, wc->status); |
| srpt_handle_send_err_comp(ch, wc->wr_id, |
| srpt_send_context); |
| } else if (opcode == SRPT_RDMA_READ_LAST || |
| opcode == SRPT_RDMA_WRITE_LAST) { |
| pr_info("RDMA t %d for idx %u failed with status %d.%s\n", |
| opcode, index, wc->status, |
| wc->status == IB_WC_RETRY_EXC_ERR ? |
| " If this has not been triggered by a cable pull, please consider to increase the subnet timeout parameter on the IB switch." : |
| wc->status == IB_WC_WR_FLUSH_ERR ? |
| " If this has not been triggered by a cable pull, please check the involved IB HCA's and cables." : |
| ""); |
| srpt_handle_rdma_err_comp(ch, ch->ioctx_ring[index], |
| opcode, srpt_xmt_rsp_context); |
| } else if (opcode == SRPT_RDMA_ZEROLENGTH_WRITE) { |
| srpt_unregister_ch(ch); |
| } else if (opcode != SRPT_RDMA_MID) { |
| WARN(true, "unexpected opcode %d\n", opcode); |
| } |
| } |
| |
| if (unlikely(!list_empty(&ch->cmd_wait_list) && |
| ch->state != CH_CONNECTING && |
| !ch->processing_wait_list)) |
| srpt_process_wait_list(ch); |
| } |
| |
| static void srpt_process_one_compl(struct srpt_rdma_ch *ch, struct ib_wc *wc) |
| { |
| struct ib_cq *const cq = ch->cq; |
| |
| if (opcode_from_wr_id(wc->wr_id) == SRPT_RECV) |
| srpt_process_rcv_completion(cq, ch, wc); |
| else |
| srpt_process_send_completion(cq, ch, wc); |
| } |
| |
| static int srpt_poll(struct srpt_rdma_ch *ch, int budget) |
| { |
| struct ib_cq *const cq = ch->cq; |
| struct ib_wc *const wc = ch->wc; |
| int i, n, processed = 0; |
| |
| while ((n = ib_poll_cq(cq, min_t(int, ARRAY_SIZE(ch->wc), budget), |
| wc)) > 0) { |
| for (i = 0; i < n; i++) |
| srpt_process_one_compl(ch, &wc[i]); |
| budget -= n; |
| processed += n; |
| } |
| |
| return processed; |
| } |
| |
| static int srpt_process_completion(struct srpt_rdma_ch *ch, int budget) |
| { |
| struct ib_cq *const cq = ch->cq; |
| int processed = 0, n = budget; |
| |
| do { |
| processed += srpt_poll(ch, n); |
| n = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP | |
| IB_CQ_REPORT_MISSED_EVENTS); |
| } while (n > 0); |
| |
| return processed; |
| } |
| |
| /* |
| * srpt_completion() - IB completion queue callback function. |
| */ |
| static void srpt_completion(struct ib_cq *cq, void *ctx) |
| { |
| struct srpt_rdma_ch *ch = ctx; |
| |
| queue_work_on(raw_smp_processor_id(), srpt_wq, &ch->compl); |
| } |
| |
| static void srpt_free_ch(struct kref *kref) |
| { |
| struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); |
| |
| srpt_destroy_ch_ib(ch); |
| |
| kfree_rcu(ch, rcu); |
| } |
| |
| /* |
| * Called indirectly by scst_unregister_session() after the last command |
| * associated with a session has finished. |
| */ |
| static void srpt_unreg_ch(struct srpt_rdma_ch *ch) |
| { |
| struct srpt_port *sport = ch->sport; |
| struct srpt_device *sdev = sport->sdev; |
| |
| WARN_ON_ONCE(ch->state != CH_DISCONNECTED); |
| flush_work(&ch->compl); |
| |
| srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
| sdev, ch->rq_size, |
| ch->req_buf_cache, DMA_FROM_DEVICE); |
| |
| srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, |
| sdev, ch->rq_size, |
| ch->rsp_buf_cache, DMA_TO_DEVICE); |
| |
| /* Wait until CM callbacks have finished and prevent new callbacks. */ |
| if (ch->using_rdma_cm) |
| rdma_destroy_id(ch->rdma_cm.cm_id); |
| else |
| ib_destroy_cm_id(ch->ib_cm.cm_id); |
| |
| /* |
| * Invoke wake_up() inside the lock to avoid that sport disappears |
| * after list_del() and before wake_up() has been invoked. |
| */ |
| mutex_lock(&sport->mutex); |
| list_del_rcu(&ch->list); |
| wake_up(&sport->ch_releaseQ); |
| mutex_unlock(&sport->mutex); |
| |
| kref_put(&ch->kref, srpt_free_ch); |
| } |
| |
| /* |
| * Called by scst_unregister_session() after the last command associated with |
| * a session has finished. |
| */ |
| static void srpt_unreg_sess(struct scst_session *sess) |
| { |
| srpt_unreg_ch(scst_sess_get_tgt_priv(sess)); |
| } |
| |
| static void srpt_unregister_ch(struct srpt_rdma_ch *ch) |
| { |
| WARN_ON_ONCE(!srpt_set_ch_state(ch, CH_DISCONNECTED)); |
| pr_debug("%s-%d: about to unregister this session\n", ch->sess_name, |
| ch->qp->qp_num); |
| scst_unregister_session(ch->sess, false, srpt_unreg_sess); |
| } |
| |
| static void srpt_do_compl_work(struct work_struct *work) |
| { |
| struct srpt_rdma_ch *ch = container_of(work, typeof(*ch), compl); |
| enum { poll_budget = 256 }; |
| int n; |
| |
| n = srpt_process_completion(ch, poll_budget); |
| if (n >= poll_budget) |
| schedule_work(work); |
| } |
| |
| /** |
| * srpt_create_ch_ib - create receive and send completion queues |
| * @ch: SRPT RDMA channel. |
| */ |
| static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) |
| { |
| struct ib_qp_init_attr *qp_init; |
| struct srpt_device *sdev = ch->sport->sdev; |
| int sq_size = srpt_sq_size, i, ret; |
| |
| EXTRACHECKS_WARN_ON(ch->rq_size < 1); |
| |
| ret = -ENOMEM; |
| qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
| if (!qp_init) |
| goto out; |
| |
| retry: |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && \ |
| !defined(RHEL_RELEASE_CODE) |
| ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, |
| ch->rq_size + sq_size); |
| #elif !defined(IB_CREATE_CQ_HAS_INIT_ATTR) |
| ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, |
| ch->rq_size + sq_size, ch->comp_vector); |
| #else |
| { |
| struct ib_cq_init_attr ia = { }; |
| |
| ia.cqe = ch->rq_size + sq_size; |
| ia.comp_vector = ch->comp_vector; |
| ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, &ia); |
| } |
| #endif |
| if (IS_ERR(ch->cq)) { |
| ret = PTR_ERR(ch->cq); |
| pr_err("failed to create CQ: cqe %d; c.v. %d; ret %d\n", |
| ch->rq_size + sq_size, ch->comp_vector, ret); |
| goto out; |
| } |
| |
| ib_req_notify_cq(ch->cq, IB_CQ_NEXT_COMP); |
| |
| qp_init->qp_context = (void *)ch; |
| qp_init->event_handler |
| = (void(*)(struct ib_event *, void*))srpt_qp_event; |
| qp_init->send_cq = ch->cq; |
| qp_init->recv_cq = ch->cq; |
| qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; |
| qp_init->qp_type = IB_QPT_RC; |
| qp_init->cap.max_send_wr = sq_size; |
| #if HAVE_DEV_ATTR_MAX_SEND_SGE |
| ch->max_send_sge = sdev->dev_attr.max_send_sge; |
| #else |
| ch->max_send_sge = sdev->dev_attr.max_sge; |
| #endif |
| qp_init->cap.max_send_sge = ch->max_send_sge; |
| qp_init->cap.max_recv_sge = 1; |
| if (sdev->use_srq) { |
| qp_init->srq = sdev->srq; |
| } else { |
| qp_init->cap.max_recv_wr = ch->rq_size; |
| } |
| |
| if (ch->using_rdma_cm) { |
| ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init); |
| ch->qp = ch->rdma_cm.cm_id->qp; |
| } else { |
| ch->qp = ib_create_qp(sdev->pd, qp_init); |
| if (!IS_ERR(ch->qp)) { |
| ret = srpt_init_ch_qp(ch, ch->qp); |
| if (ret) |
| ib_destroy_qp(ch->qp); |
| } else { |
| ret = PTR_ERR(ch->qp); |
| } |
| } |
| if (ret) { |
| bool retry = sq_size > MIN_SRPT_SQ_SIZE; |
| |
| if (retry) { |
| pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n", |
| sq_size, ret); |
| ib_destroy_cq(ch->cq); |
| sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE); |
| goto retry; |
| } else { |
| pr_err("failed to create queue pair with sq_size = %d (%d)\n", |
| sq_size, ret); |
| goto err_destroy_cq; |
| } |
| } |
| |
| pr_debug("qp_num = %#x\n", ch->qp->qp_num); |
| |
| if (!sdev->use_srq) |
| for (i = 0; i < ch->rq_size; i++) |
| srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]); |
| |
| atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); |
| |
| pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n", __func__, |
| ch->cq->cqe, qp_init->cap.max_send_sge, |
| qp_init->cap.max_send_wr, ch); |
| |
| out: |
| kfree(qp_init); |
| return ret; |
| |
| err_destroy_cq: |
| ch->qp = NULL; |
| ib_destroy_cq(ch->cq); |
| goto out; |
| } |
| |
| static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) |
| { |
| ib_destroy_qp(ch->qp); |
| ib_destroy_cq(ch->cq); |
| } |
| |
| /** |
| * srpt_close_ch - close a RDMA channel |
| * @ch: SRPT RDMA channel. |
| * |
| * Make sure all resources associated with the channel will be deallocated at |
| * an appropriate time. |
| * |
| * Returns true if and only if the channel state has been modified into |
| * CH_DRAINING. |
| */ |
| static bool srpt_close_ch(struct srpt_rdma_ch *ch) |
| { |
| int ret; |
| |
| if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
| pr_debug("%s: already closed\n", ch->sess_name); |
| return false; |
| } |
| |
| kref_get(&ch->kref); |
| |
| ret = srpt_ch_qp_err(ch); |
| if (ret < 0) |
| pr_err("%s-%d: changing queue pair into error state failed: %d\n", |
| ch->sess_name, ch->qp->qp_num, ret); |
| |
| ret = srpt_zerolength_write(ch); |
| if (ret < 0) { |
| pr_err("%s-%d: queuing zero-length write failed: %d\n", |
| ch->sess_name, ch->qp->qp_num, ret); |
| srpt_unregister_ch(ch); |
| } |
| |
| kref_put(&ch->kref, srpt_free_ch); |
| |
| return true; |
| } |
| |
| /* |
| * Change the channel state into CH_DISCONNECTING. If a channel has not yet |
| * reached the connected state, close it. If a channel is in the connected |
| * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is |
| * the responsibility of the caller to ensure that this function is not |
| * invoked concurrently with the code that accepts a connection. This means |
| * that this function must either be invoked from inside a CM callback |
| * function or that it must be invoked with the srpt_port.mutex held. |
| */ |
| static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
| { |
| int ret; |
| |
| if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
| return -ENOTCONN; |
| |
| if (ch->using_rdma_cm) { |
| ret = rdma_disconnect(ch->rdma_cm.cm_id); |
| } else { |
| ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0); |
| if (ret < 0) |
| ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0); |
| } |
| |
| if (ret < 0 && srpt_close_ch(ch)) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| static void __srpt_close_all_ch(struct srpt_port *sport) |
| { |
| struct srpt_nexus *nexus; |
| struct srpt_rdma_ch *ch; |
| |
| lockdep_assert_held(&sport->mutex); |
| |
| list_for_each_entry(nexus, &sport->nexus_list, entry) { |
| list_for_each_entry(ch, &nexus->ch_list, list) { |
| if (srpt_disconnect_ch(ch) >= 0) |
| pr_info("Closing channel %s-%d because target %s has been disabled\n", |
| ch->sess_name, ch->qp->qp_num, |
| sport->scst_tgt->tgt_name); |
| srpt_close_ch(ch); |
| } |
| } |
| } |
| |
| /* |
| * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if |
| * it does not yet exist. |
| */ |
| static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport, |
| const u8 i_port_id[16], |
| const u8 t_port_id[16]) |
| { |
| struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n; |
| |
| for (;;) { |
| mutex_lock(&sport->mutex); |
| list_for_each_entry(n, &sport->nexus_list, entry) { |
| if (memcmp(n->i_port_id, i_port_id, 16) == 0 && |
| memcmp(n->t_port_id, t_port_id, 16) == 0) { |
| nexus = n; |
| break; |
| } |
| } |
| if (!nexus && tmp_nexus) { |
| list_add_tail_rcu(&tmp_nexus->entry, |
| &sport->nexus_list); |
| swap(nexus, tmp_nexus); |
| } |
| mutex_unlock(&sport->mutex); |
| |
| if (nexus) |
| break; |
| tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); |
| if (!tmp_nexus) { |
| nexus = ERR_PTR(-ENOMEM); |
| break; |
| } |
| INIT_LIST_HEAD(&tmp_nexus->ch_list); |
| memcpy(tmp_nexus->i_port_id, i_port_id, 16); |
| memcpy(tmp_nexus->t_port_id, t_port_id, 16); |
| } |
| |
| kfree(tmp_nexus); |
| |
| return nexus; |
| } |
| |
| /* |
| * srpt_enable_target - Set the "enabled" status of a target. |
| */ |
| static int srpt_enable_target(struct scst_tgt *scst_tgt, bool enable) |
| { |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| EXTRACHECKS_WARN_ON_ONCE(irqs_disabled()); |
| |
| if (!sport) |
| goto out; |
| |
| pr_info("%s target %s\n", enable ? "Enabling" : "Disabling", |
| scst_tgt->tgt_name); |
| |
| mutex_lock(&sport->mutex); |
| sport->enabled = enable; |
| if (!enable) |
| __srpt_close_all_ch(sport); |
| mutex_unlock(&sport->mutex); |
| |
| res = 0; |
| |
| out: |
| return res; |
| } |
| |
| /* |
| * srpt_is_target_enabled - Report whether a target is enabled. |
| */ |
| static bool srpt_is_target_enabled(struct scst_tgt *scst_tgt) |
| { |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| |
| return sport && sport->enabled; |
| } |
| |
| /* |
| * srpt_next_comp_vector() - Next completion vector >= sport->comp_vector |
| */ |
| static u16 srpt_next_comp_vector(struct srpt_port *sport) |
| { |
| u16 comp_vector; |
| |
| mutex_lock(&sport->mutex); |
| comp_vector = cpumask_next(sport->comp_vector, &sport->comp_v_mask); |
| if (comp_vector >= nr_cpu_ids) |
| comp_vector = cpumask_next(-1, &sport->comp_v_mask); |
| sBUG_ON(comp_vector >= nr_cpu_ids); |
| sport->comp_vector = comp_vector; |
| mutex_unlock(&sport->mutex); |
| |
| return comp_vector; |
| } |
| |
| /** |
| * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED |
| * @sdev: HCA through which the login request was received. |
| * @ib_cm_id: IB/CM connection identifier in case of IB/CM. |
| * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM. |
| * @port_num: Port through which the REQ message was received. |
| * @pkey: P_Key of the incoming connection. |
| * @req: SRP login request. |
| * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted |
| * the login request. |
| * |
| * Ownership of the cm_id is transferred to the target session if this |
| * function returns zero. Otherwise the caller remains the owner of cm_id. |
| */ |
| static int srpt_cm_req_recv(struct srpt_device *const sdev, |
| struct ib_cm_id *ib_cm_id, |
| struct rdma_cm_id *rdma_cm_id, |
| u8 port_num, __be16 pkey, |
| const struct srp_login_req *req, |
| const char *src_addr) |
| { |
| struct srpt_port *const sport = &sdev->port[port_num - 1]; |
| struct srpt_nexus *nexus; |
| struct srp_login_rsp *rsp = NULL; |
| struct srp_login_rej *rej = NULL; |
| union { |
| struct rdma_conn_param rdma_cm; |
| struct ib_cm_rep_param ib_cm; |
| } *rep_param = NULL; |
| struct srpt_rdma_ch *ch = NULL; |
| u32 it_iu_len; |
| int i, ret; |
| |
| WARN_ON_ONCE(irqs_disabled()); |
| |
| #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) |
| WARN_ON(!sdev || !req); |
| if (!sdev || !req) |
| return -EINVAL; |
| #else |
| if (WARN_ON(!sdev || !req)) |
| return -EINVAL; |
| #endif |
| |
| it_iu_len = be32_to_cpu(req->req_it_iu_len); |
| |
| pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n", |
| req->initiator_port_id, req->target_port_id, it_iu_len, |
| port_num, &sport->gid, be16_to_cpu(pkey)); |
| |
| nexus = srpt_get_nexus(sport, req->initiator_port_id, |
| req->target_port_id); |
| if (IS_ERR(nexus)) { |
| ret = PTR_ERR(nexus); |
| goto out; |
| } |
| |
| ret = -ENOMEM; |
| rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
| rej = kzalloc(sizeof(*rej), GFP_KERNEL); |
| rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); |
| if (!rsp || !rej || !rep_param) |
| goto out; |
| |
| ret = -EINVAL; |
| if (it_iu_len > srp_max_req_size || it_iu_len < 64) { |
| rej->reason = cpu_to_be32( |
| SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); |
| pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n", |
| it_iu_len, 64, srp_max_req_size); |
| goto reject; |
| } |
| |
| if (!sport->enabled) { |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_info("rejected SRP_LOGIN_REQ because target port %s has not yet been enabled\n", |
| sport->scst_tgt->tgt_name); |
| goto reject; |
| } |
| |
| if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) |
| || *(__be64 *)(req->target_port_id + 8) != |
| cpu_to_be64(srpt_service_guid)) { |
| rej->reason = cpu_to_be32( |
| SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); |
| pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n"); |
| goto reject; |
| } |
| |
| ret = -ENOMEM; |
| ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
| if (!ch) { |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_err("rejected SRP_LOGIN_REQ because out of memory.\n"); |
| goto reject; |
| } |
| |
| kref_init(&ch->kref); |
| ch->pkey = be16_to_cpu(pkey); |
| ch->nexus = nexus; |
| ch->sport = sport; |
| if (ib_cm_id) { |
| ch->ib_cm.cm_id = ib_cm_id; |
| ib_cm_id->context = ch; |
| } else { |
| ch->using_rdma_cm = true; |
| ch->rdma_cm.cm_id = rdma_cm_id; |
| rdma_cm_id->context = ch; |
| } |
| /* |
| * ch->rq_size should be at least as large as the initiator queue |
| * depth to avoid that the initiator driver has to report QUEUE_FULL |
| * to the SCSI mid-layer. |
| */ |
| ch->rq_size = min(MAX_SRPT_RQ_SIZE, scst_get_max_lun_commands(NULL, 0)); |
| spin_lock_init(&ch->spinlock); |
| ch->state = CH_CONNECTING; |
| INIT_WORK(&ch->compl, srpt_do_compl_work); |
| INIT_LIST_HEAD(&ch->cmd_wait_list); |
| ch->max_rsp_size = max_t(uint32_t, srp_max_rsp_size, MIN_MAX_RSP_SIZE); |
| |
| ch->rsp_buf_cache = kmem_cache_create("srpt-rsp-buf", ch->max_rsp_size, |
| 512, 0, NULL); |
| if (!ch->rsp_buf_cache) |
| goto free_ch; |
| |
| ch->ioctx_ring = (struct srpt_send_ioctx **) |
| srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, |
| sizeof(*ch->ioctx_ring[0]), |
| ch->rsp_buf_cache, 0, DMA_TO_DEVICE); |
| if (!ch->ioctx_ring) { |
| pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n"); |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| goto free_rsp_cache; |
| } |
| |
| INIT_LIST_HEAD(&ch->free_list); |
| for (i = 0; i < ch->rq_size; i++) { |
| ch->ioctx_ring[i]->ch = ch; |
| list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); |
| } |
| if (!sdev->use_srq) { |
| u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ? |
| be16_to_cpu(req->imm_data_offset) : 0; |
| u16 alignment_offset; |
| u32 req_sz; |
| |
| if (req->req_flags & SRP_IMMED_REQUESTED) |
| pr_debug("imm_data_offset = %d\n", |
| be16_to_cpu(req->imm_data_offset)); |
| if (imm_data_offset >= sizeof(struct srp_cmd)) { |
| ch->imm_data_offset = imm_data_offset; |
| rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP; |
| } else { |
| ch->imm_data_offset = 0; |
| } |
| alignment_offset = round_up(imm_data_offset, 512) - |
| imm_data_offset; |
| req_sz = alignment_offset + imm_data_offset + srp_max_req_size; |
| ch->req_buf_cache = kmem_cache_create("srpt-req-buf", req_sz, |
| 512, 0, NULL); |
| if (!ch->req_buf_cache) |
| goto free_rsp_ring; |
| |
| ch->ioctx_recv_ring = (struct srpt_recv_ioctx **) |
| srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, |
| sizeof(*ch->ioctx_recv_ring[0]), |
| ch->req_buf_cache, |
| alignment_offset, |
| DMA_FROM_DEVICE); |
| if (!ch->ioctx_recv_ring) { |
| pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n"); |
| rej->reason = |
| cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| goto free_recv_cache; |
| } |
| for (i = 0; i < ch->rq_size; i++) |
| INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list); |
| } |
| |
| ch->comp_vector = srpt_next_comp_vector(sport); |
| |
| ret = srpt_create_ch_ib(ch); |
| if (ret) { |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n"); |
| goto free_recv_ring; |
| } |
| |
| strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name)); |
| pr_debug("registering session %s\n", ch->sess_name); |
| |
| BUG_ON(!sport->scst_tgt); |
| ret = -ENOMEM; |
| ch->sess = scst_register_session(sport->scst_tgt, 0, |
| ch->sess_name, ch, NULL, NULL); |
| if (!ch->sess) { |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_debug("Failed to create SCST session\n"); |
| goto destroy_ib; |
| } |
| |
| mutex_lock(&sport->mutex); |
| |
| if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { |
| struct srpt_rdma_ch *ch2; |
| |
| list_for_each_entry(ch2, &nexus->ch_list, list) { |
| if (srpt_disconnect_ch(ch2) < 0) |
| continue; |
| pr_info("Relogin - closed existing channel %s\n", |
| ch2->sess_name); |
| rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED; |
| } |
| } else { |
| rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; |
| } |
| |
| list_add_tail_rcu(&ch->list, &nexus->ch_list); |
| |
| if (!sport->enabled) { |
| rej->reason = cpu_to_be32( |
| SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_info("rejected SRP_LOGIN_REQ because the target %s (%s) is not enabled\n", |
| sport->scst_tgt->tgt_name, |
| dev_name(&sdev->device->dev)); |
| mutex_unlock(&sport->mutex); |
| goto reject; |
| } |
| |
| mutex_unlock(&sport->mutex); |
| |
| ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp); |
| if (ret) { |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n", |
| ret); |
| goto reject; |
| } |
| |
| pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess, |
| ch->sess_name, ch); |
| |
| /* create srp_login_response */ |
| rsp->opcode = SRP_LOGIN_RSP; |
| rsp->tag = req->tag; |
| rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size); |
| rsp->max_ti_iu_len = req->req_it_iu_len; |
| ch->max_ti_iu_len = it_iu_len; |
| rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
| SRP_BUF_FORMAT_INDIRECT); |
| rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
| ch->req_lim = ch->rq_size; |
| ch->req_lim_delta = 0; |
| |
| /* create cm reply */ |
| if (ch->using_rdma_cm) { |
| rep_param->rdma_cm.private_data = (void *)rsp; |
| rep_param->rdma_cm.private_data_len = sizeof(*rsp); |
| rep_param->rdma_cm.rnr_retry_count = 7; |
| rep_param->rdma_cm.flow_control = 1; |
| rep_param->rdma_cm.responder_resources = 4; |
| rep_param->rdma_cm.initiator_depth = 4; |
| } else { |
| rep_param->ib_cm.qp_num = ch->qp->qp_num; |
| rep_param->ib_cm.private_data = (void *)rsp; |
| rep_param->ib_cm.private_data_len = sizeof(*rsp); |
| rep_param->ib_cm.rnr_retry_count = 7; |
| rep_param->ib_cm.flow_control = 1; |
| rep_param->ib_cm.failover_accepted = 0; |
| rep_param->ib_cm.srq = 1; |
| rep_param->ib_cm.responder_resources = 4; |
| rep_param->ib_cm.initiator_depth = 4; |
| } |
| |
| /* |
| * Hold the sport mutex while accepting a connection to avoid that |
| * srpt_disconnect_ch() is invoked concurrently with this code. |
| */ |
| mutex_lock(&sport->mutex); |
| if (sport->enabled && ch->state == CH_CONNECTING) { |
| if (ch->using_rdma_cm) |
| ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm); |
| else |
| ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm); |
| } else { |
| ret = -EINVAL; |
| } |
| mutex_unlock(&sport->mutex); |
| |
| switch (ret) { |
| case 0: |
| break; |
| case -EINVAL: |
| goto reject; |
| default: |
| rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
| pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n", |
| ret); |
| goto reject; |
| } |
| |
| goto out; |
| |
| destroy_ib: |
| srpt_destroy_ch_ib(ch); |
| |
| free_recv_ring: |
| srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
| ch->sport->sdev, ch->rq_size, |
| ch->req_buf_cache, DMA_FROM_DEVICE); |
| |
| free_recv_cache: |
| kmem_cache_destroy(ch->req_buf_cache); |
| |
| free_rsp_ring: |
| srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, |
| ch->sport->sdev, ch->rq_size, |
| ch->rsp_buf_cache, DMA_TO_DEVICE); |
| |
| free_rsp_cache: |
| kmem_cache_destroy(ch->rsp_buf_cache); |
| |
| free_ch: |
| if (rdma_cm_id) |
| rdma_cm_id->context = NULL; |
| else |
| ib_cm_id->context = NULL; |
| kfree(ch); |
| ch = NULL; |
| |
| WARN_ON_ONCE(ret == 0); |
| |
| reject: |
| pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason)); |
| rej->opcode = SRP_LOGIN_REJ; |
| rej->tag = req->tag; |
| rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
| SRP_BUF_FORMAT_INDIRECT); |
| |
| if (rdma_cm_id) |
| rdma_reject(rdma_cm_id, rej, sizeof(*rej) |
| #if RDMA_REJECT_HAS_FOUR_ARGS |
| , IB_CM_REJ_CONSUMER_DEFINED |
| #endif |
| ); |
| else |
| ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, |
| rej, sizeof(*rej)); |
| |
| if (ch && ch->qp) { |
| srpt_close_ch(ch); |
| /* |
| * Tell the caller not to free cm_id since srpt_do_compl_work() |
| * will do that. |
| */ |
| ret = 0; |
| } |
| |
| out: |
| kfree(rep_param); |
| kfree(rsp); |
| kfree(rej); |
| |
| return ret; |
| } |
| |
| static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id, |
| const struct ib_cm_req_event_param *param, |
| void *private_data) |
| { |
| char sgid[40]; |
| |
| snprintf(sgid, sizeof(sgid), "%pI6", ¶m->primary_path->dgid); |
| |
| return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port, |
| param->primary_path->pkey, |
| private_data, sgid); |
| } |
| |
| static const char *inet_ntop(const void *sa, char *dst, unsigned int size) |
| { |
| switch (((struct sockaddr *)sa)->sa_family) { |
| case AF_INET: |
| snprintf(dst, size, "%pI4", |
| &((struct sockaddr_in *)sa)->sin_addr); |
| break; |
| case AF_INET6: |
| snprintf(dst, size, "%pI6", |
| &((struct sockaddr_in6 *)sa)->sin6_addr); |
| break; |
| default: |
| snprintf(dst, size, "???"); |
| break; |
| } |
| return dst; |
| } |
| |
| static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id, |
| const struct rdma_cm_event *event) |
| { |
| struct srpt_device *sdev; |
| struct srp_login_req req; |
| const struct srp_login_req_rdma *req_rdma; |
| /* |
| * See also commit c2f8fc4ec440 ("IB/SA: Rename ib_sa_path_rec to |
| * sa_path_rec") # v4.12. |
| */ |
| typeof(cm_id->route.path_rec) path_rec = cm_id->route.path_rec; |
| char src_addr[40]; |
| |
| sdev = ib_get_client_data(cm_id->device, &srpt_client); |
| if (!sdev) |
| return -ECONNREFUSED; |
| |
| if (event->param.conn.private_data_len < sizeof(*req_rdma)) |
| return -EINVAL; |
| |
| /* Transform srp_login_req_rdma into srp_login_req. */ |
| req_rdma = event->param.conn.private_data; |
| memset(&req, 0, sizeof(req)); |
| req.opcode = req_rdma->opcode; |
| req.tag = req_rdma->tag; |
| req.req_it_iu_len = req_rdma->req_it_iu_len; |
| req.req_buf_fmt = req_rdma->req_buf_fmt; |
| req.req_flags = req_rdma->req_flags; |
| memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16); |
| memcpy(req.target_port_id, req_rdma->target_port_id, 16); |
| req.imm_data_offset = req_rdma->imm_data_offset; |
| |
| inet_ntop(&cm_id->route.addr.src_addr, src_addr, sizeof(src_addr)); |
| |
| return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num, |
| path_rec ? path_rec->pkey : 0, &req, src_addr); |
| } |
| |
| static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
| enum ib_cm_rej_reason reason, |
| const u8 *private_data, |
| u8 private_data_len) |
| { |
| char *priv = NULL; |
| int i; |
| |
| if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, |
| GFP_KERNEL))) { |
| for (i = 0; i < private_data_len; i++) |
| sprintf(priv + 3 * i, " %02x", private_data[i]); |
| } |
| pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", |
| ch->sess_name, ch->qp->qp_num, reason, private_data_len ? |
| "; private data" : "", priv ? priv : " (?)"); |
| kfree(priv); |
| } |
| |
| static void srpt_check_timeout(struct srpt_rdma_ch *ch) |
| { |
| struct ib_qp_attr attr; |
| struct ib_qp_init_attr iattr; |
| uint64_t T_tr_ns, max_compl_time_ms; |
| uint64_t T_tr_ms; |
| |
| if (ib_query_qp(ch->qp, &attr, IB_QP_TIMEOUT, &iattr) < 0) { |
| pr_err("Querying QP attributes failed\n"); |
| return; |
| } |
| |
| /* |
| * From IBTA C9-140: Transport Timer timeout interval |
| * T_tr = 4.096 us * 2**(local ACK timeout) where the local ACK timeout |
| * is a five-bit value, with zero meaning that the timer is disabled. |
| */ |
| WARN_ON(attr.timeout >= (1 << 5)); |
| if (attr.timeout) { |
| T_tr_ns = 1ULL << (12 + attr.timeout); |
| max_compl_time_ms = attr.retry_cnt * 4 * T_tr_ns; |
| do_div(max_compl_time_ms, 1000000); |
| T_tr_ms = T_tr_ns; |
| do_div(T_tr_ms, 1000000); |
| pr_debug("%s-%d: QP local ack timeout = %d or T_tr = %llu ms; retry_cnt = %d; max compl. time = %d ms\n", |
| ch->sess_name, ch->qp->qp_num, attr.timeout, T_tr_ms, |
| attr.retry_cnt, (unsigned int)max_compl_time_ms); |
| |
| if (max_compl_time_ms >= RDMA_COMPL_TIMEOUT_S * 1000) { |
| pr_err("Maximum RDMA completion time (%lld ms) exceeds ib_srpt timeout (%d ms)\n", |
| max_compl_time_ms, 1000 * RDMA_COMPL_TIMEOUT_S); |
| } |
| } |
| } |
| |
| /** |
| * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event |
| * @ch: SRPT RDMA channel. |
| * |
| * An RTU (ready to use) message indicates that the connection has been |
| * established and that the recipient may begin transmitting. |
| */ |
| static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
| { |
| int ret; |
| |
| ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp); |
| if (ret < 0) { |
| pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name, |
| ch->qp->qp_num); |
| srpt_close_ch(ch); |
| return; |
| } |
| |
| srpt_check_timeout(ch); |
| |
| /* |
| * Note: calling srpt_close_ch() if the transition to the LIVE state |
| * fails is not necessary since that means that that function has |
| * already been invoked from another thread. |
| */ |
| if (!srpt_set_ch_state(ch, CH_LIVE)) |
| pr_err("%s-%d: channel transition to LIVE state failed\n", |
| ch->sess_name, ch->qp->qp_num); |
| |
| /* Trigger wait list processing. */ |
| ret = srpt_zerolength_write(ch); |
| WARN_ONCE(ret < 0, "%d\n", ret); |
| } |
| |
| /** |
| * srpt_cm_handler - IB connection manager callback function |
| * @cm_id: IB/CM connection identifier. |
| * @event: IB/CM event. |
| * |
| * A non-zero return value will cause the caller destroy the CM ID. |
| * |
| * Note: srpt_cm_handler() must only return a non-zero value when transferring |
| * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning |
| * a non-zero value in any other case will trigger a race with the |
| * ib_destroy_cm_id() call triggered indirectly by srpt_do_compl_work(). |
| */ |
| static int srpt_cm_handler(struct ib_cm_id *cm_id, |
| CM_HANDLER_EVENT_MODIFIER struct ib_cm_event *event) |
| { |
| struct srpt_rdma_ch *ch = cm_id->context; |
| int ret; |
| |
| ret = 0; |
| switch (event->event) { |
| case IB_CM_REQ_RECEIVED: |
| ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd, |
| event->private_data); |
| break; |
| case IB_CM_REJ_RECEIVED: |
| srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
| event->private_data, |
| IB_CM_REJ_PRIVATE_DATA_SIZE); |
| break; |
| case IB_CM_RTU_RECEIVED: |
| case IB_CM_USER_ESTABLISHED: |
| srpt_cm_rtu_recv(ch); |
| break; |
| case IB_CM_DREQ_RECEIVED: |
| srpt_disconnect_ch(ch); |
| break; |
| case IB_CM_DREP_RECEIVED: |
| pr_info("Received CM DREP message for ch %s-%d.\n", |
| ch->sess_name, ch->qp->qp_num); |
| srpt_close_ch(ch); |
| break; |
| case IB_CM_TIMEWAIT_EXIT: |
| pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
| ch->sess_name, ch->qp->qp_num); |
| srpt_close_ch(ch); |
| break; |
| case IB_CM_REP_ERROR: |
| pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
| ch->qp->qp_num); |
| break; |
| case IB_CM_DREQ_ERROR: |
| pr_info("Received CM DREQ ERROR event.\n"); |
| break; |
| case IB_CM_MRA_RECEIVED: |
| pr_info("Received CM MRA event\n"); |
| break; |
| default: |
| pr_err("received unrecognized CM event %d\n", event->event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event) |
| { |
| struct srpt_rdma_ch *ch = cm_id->context; |
| int ret = 0; |
| |
| switch (event->event) { |
| case RDMA_CM_EVENT_CONNECT_REQUEST: |
| ret = srpt_rdma_cm_req_recv(cm_id, event); |
| break; |
| case RDMA_CM_EVENT_REJECTED: |
| srpt_cm_rej_recv(ch, event->status, |
| event->param.conn.private_data, |
| event->param.conn.private_data_len); |
| break; |
| case RDMA_CM_EVENT_ESTABLISHED: |
| srpt_cm_rtu_recv(ch); |
| break; |
| case RDMA_CM_EVENT_DISCONNECTED: |
| if (ch->state < CH_DISCONNECTING) |
| srpt_disconnect_ch(ch); |
| else |
| srpt_close_ch(ch); |
| break; |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
| srpt_close_ch(ch); |
| break; |
| case RDMA_CM_EVENT_UNREACHABLE: |
| pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
| ch->qp->qp_num); |
| break; |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| break; |
| default: |
| pr_err("received unrecognized RDMA CM event %d\n", |
| event->event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list. |
| */ |
| static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| struct scst_cmd *cmd) |
| { |
| struct srpt_device *sdev = ch->sport->sdev; |
| struct ib_device *dev __maybe_unused = sdev->device; |
| struct scatterlist *sg, *cur_sg; |
| int sg_cnt; |
| scst_data_direction dir; |
| struct rdma_iu *riu; |
| struct srp_direct_buf *db; |
| dma_addr_t dma_addr; |
| struct ib_sge *sge_array, *sge; |
| u64 raddr; |
| u32 rsize; |
| u32 tsize; |
| u32 dma_len; |
| int count; |
| int i, j, k; |
| int max_sge, nsge; |
| |
| max_sge = ch->max_send_sge; |
| dir = scst_cmd_get_data_direction(cmd); |
| BUG_ON(dir == SCST_DATA_NONE); |
| /* |
| * Cache 'dir' because it is needed in srpt_unmap_sg_to_ib_sge() |
| * and because scst_set_cmd_error_status() resets cmd->data_direction. |
| */ |
| ioctx->dir = dir; |
| if (dir == SCST_DATA_WRITE) { |
| scst_cmd_get_write_fields(cmd, &sg, &sg_cnt); |
| WARN_ON(!sg); |
| max_sge = min(max_sge, ch->sport->sdev->dev_attr.max_sge_rd); |
| } else { |
| sg = scst_cmd_get_sg(cmd); |
| sg_cnt = scst_cmd_get_sg_cnt(cmd); |
| WARN_ON(!sg); |
| } |
| ioctx->sg = sg; |
| ioctx->sg_cnt = sg_cnt; |
| count = ib_dma_map_sg(sdev->device, sg, sg_cnt, |
| scst_to_tgt_dma_dir(dir)); |
| if (unlikely(!count)) |
| return -EBUSY; |
| |
| ioctx->mapped_sg_count = count; |
| |
| { |
| int size, nrdma; |
| |
| nrdma = (count + max_sge - 1) / max_sge + ioctx->n_rbuf; |
| nsge = count + ioctx->n_rbuf; |
| size = nrdma * sizeof(*riu) + nsge * sizeof(*sge); |
| ioctx->rdma_ius = size <= sizeof(ioctx->rdma_ius_buf) ? |
| ioctx->rdma_ius_buf : kmalloc(size, |
| scst_cmd_atomic(cmd) ? GFP_ATOMIC : GFP_KERNEL); |
| if (!ioctx->rdma_ius) |
| goto free_mem; |
| |
| ioctx->n_rdma_ius = nrdma; |
| sge_array = (struct ib_sge *)(ioctx->rdma_ius + nrdma); |
| } |
| |
| db = ioctx->rbufs; |
| tsize = (dir == SCST_DATA_READ) |
| ? scst_cmd_get_adjusted_resp_data_len(cmd) |
| : scst_cmd_get_bufflen(cmd); |
| dma_len = ib_sg_dma_len(dev, &sg[0]); |
| riu = ioctx->rdma_ius; |
| sge = sge_array; |
| |
| /* |
| * For each remote desc - calculate the #ib_sge. |
| * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then |
| * each remote desc rdma_iu is required a rdma wr; |
| * else |
| * we need to allocate extra rdma_iu to carry extra #ib_sge in |
| * another rdma wr |
| */ |
| for (i = 0, j = 0, cur_sg = sg; |
| j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { |
| rsize = be32_to_cpu(db->len); |
| raddr = be64_to_cpu(db->va); |
| riu->raddr = raddr; |
| riu->rkey = be32_to_cpu(db->key); |
| riu->sge_cnt = 0; |
| riu->sge = sge; |
| |
| /* calculate how many sge required for this remote_buf */ |
| while (rsize > 0 && tsize > 0) { |
| |
| if (rsize >= dma_len) { |
| tsize -= dma_len; |
| rsize -= dma_len; |
| raddr += dma_len; |
| |
| if (tsize > 0) { |
| ++j; |
| if (j < count) { |
| cur_sg = __sg_next_inline(cur_sg); |
| dma_len = ib_sg_dma_len(dev, cur_sg); |
| } |
| } |
| } else { |
| tsize -= rsize; |
| dma_len -= rsize; |
| rsize = 0; |
| } |
| |
| ++riu->sge_cnt; |
| ++sge; |
| |
| if (rsize > 0 && riu->sge_cnt == max_sge) { |
| ++riu; |
| riu->raddr = raddr; |
| riu->rkey = be32_to_cpu(db->key); |
| riu->sge_cnt = 0; |
| riu->sge = sge; |
| } |
| } |
| } |
| |
| ioctx->n_rdma = riu - ioctx->rdma_ius; |
| EXTRACHECKS_WARN_ON(ioctx->n_rdma > ioctx->n_rdma_ius); |
| EXTRACHECKS_WARN_ON(sge - sge_array > nsge); |
| |
| db = ioctx->rbufs; |
| tsize = (dir == SCST_DATA_READ) |
| ? scst_cmd_get_adjusted_resp_data_len(cmd) |
| : scst_cmd_get_bufflen(cmd); |
| riu = ioctx->rdma_ius; |
| dma_len = ib_sg_dma_len(dev, &sg[0]); |
| dma_addr = ib_sg_dma_address(dev, &sg[0]); |
| |
| /* this second loop is really mapped sg_address to rdma_iu->ib_sge */ |
| for (i = 0, j = 0, cur_sg = sg; |
| j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { |
| rsize = be32_to_cpu(db->len); |
| sge = riu->sge; |
| k = 0; |
| |
| while (rsize > 0 && tsize > 0) { |
| sge->addr = dma_addr; |
| sge->lkey = sdev->lkey; |
| |
| if (rsize >= dma_len) { |
| sge->length = |
| (tsize < dma_len) ? tsize : dma_len; |
| tsize -= dma_len; |
| rsize -= dma_len; |
| |
| if (tsize > 0) { |
| ++j; |
| if (j < count) { |
| cur_sg = __sg_next_inline(cur_sg); |
| dma_len = ib_sg_dma_len(dev, cur_sg); |
| dma_addr = |
| ib_sg_dma_address(dev, cur_sg); |
| } |
| } |
| } else { |
| sge->length = (tsize < rsize) ? tsize : rsize; |
| tsize -= rsize; |
| dma_len -= rsize; |
| dma_addr += rsize; |
| rsize = 0; |
| } |
| |
| ++k; |
| if (k == riu->sge_cnt && rsize > 0 && tsize > 0) { |
| ++riu; |
| sge = riu->sge; |
| k = 0; |
| } else if (rsize > 0 && tsize > 0) |
| ++sge; |
| } |
| } |
| |
| EXTRACHECKS_WARN_ON(riu - ioctx->rdma_ius != ioctx->n_rdma); |
| |
| return 0; |
| |
| free_mem: |
| srpt_unmap_sg_to_ib_sge(ch, ioctx); |
| |
| return -ENOMEM; |
| } |
| |
| /* |
| * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list. |
| */ |
| static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx) |
| { |
| struct scatterlist *sg; |
| scst_data_direction dir; |
| |
| EXTRACHECKS_BUG_ON(!ch); |
| EXTRACHECKS_BUG_ON(!ioctx); |
| |
| if (scst_cmd_get_tgt_sg(&ioctx->cmd) == &ioctx->imm_sg) |
| return; |
| |
| EXTRACHECKS_BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius); |
| |
| if (ioctx->rdma_ius != (void *)ioctx->rdma_ius_buf) |
| kfree(ioctx->rdma_ius); |
| ioctx->rdma_ius = NULL; |
| ioctx->n_rdma = 0; |
| |
| if (ioctx->mapped_sg_count) { |
| EXTRACHECKS_WARN_ON(ioctx |
| != scst_cmd_get_tgt_priv(&ioctx->cmd)); |
| sg = ioctx->sg; |
| EXTRACHECKS_WARN_ON(!sg); |
| dir = ioctx->dir; |
| EXTRACHECKS_BUG_ON(dir == SCST_DATA_NONE); |
| ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt, |
| scst_to_tgt_dma_dir(dir)); |
| ioctx->mapped_sg_count = 0; |
| } |
| } |
| |
| /* |
| * srpt_perform_rdmas() - Perform IB RDMA. |
| * |
| * Returns zero upon success or a negative number upon failure. |
| */ |
| static int srpt_perform_rdmas(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx, |
| scst_data_direction dir) |
| { |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| struct ib_send_wr wr; |
| #else |
| struct ib_rdma_wr wr; |
| #endif |
| BAD_WR_MODIFIER struct ib_send_wr *bad_wr; |
| struct rdma_iu *riu; |
| int i; |
| int ret = -ENOMEM; |
| int sq_wr_avail; |
| const int n_rdma = ioctx->n_rdma; |
| |
| sq_wr_avail = srpt_adjust_sq_wr_avail(ch, -n_rdma); |
| if (sq_wr_avail < 0) { |
| pr_warn("ch %s-%d send queue full (needed %d)\n", |
| ch->sess_name, ch->qp->qp_num, n_rdma); |
| goto out; |
| } |
| |
| ioctx->rdma_aborted = false; |
| ret = 0; |
| riu = ioctx->rdma_ius; |
| memset(&wr, 0, sizeof(wr)); |
| |
| for (i = 0; i < n_rdma; ++i, ++riu) { |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| if (dir == SCST_DATA_READ) { |
| wr.opcode = IB_WR_RDMA_WRITE; |
| wr.wr_id = encode_wr_id(i == n_rdma - 1 ? |
| SRPT_RDMA_WRITE_LAST : |
| SRPT_RDMA_MID, |
| ioctx->ioctx.index); |
| } else { |
| wr.opcode = IB_WR_RDMA_READ; |
| wr.wr_id = encode_wr_id(i == n_rdma - 1 ? |
| SRPT_RDMA_READ_LAST : |
| SRPT_RDMA_MID, |
| ioctx->ioctx.index); |
| } |
| wr.next = NULL; |
| wr.wr.rdma.remote_addr = riu->raddr; |
| wr.wr.rdma.rkey = riu->rkey; |
| wr.num_sge = riu->sge_cnt; |
| wr.sg_list = riu->sge; |
| |
| /* only get completion event for the last rdma wr */ |
| if (i == (n_rdma - 1) && dir == SCST_DATA_WRITE) |
| wr.send_flags = IB_SEND_SIGNALED; |
| |
| ret = ib_post_send(ch->qp, &wr, &bad_wr); |
| #else |
| if (dir == SCST_DATA_READ) { |
| wr.wr.opcode = IB_WR_RDMA_WRITE; |
| wr.wr.wr_id = encode_wr_id(i == n_rdma - 1 ? |
| SRPT_RDMA_WRITE_LAST : |
| SRPT_RDMA_MID, |
| ioctx->ioctx.index); |
| } else { |
| wr.wr.opcode = IB_WR_RDMA_READ; |
| wr.wr.wr_id = encode_wr_id(i == n_rdma - 1 ? |
| SRPT_RDMA_READ_LAST : |
| SRPT_RDMA_MID, |
| ioctx->ioctx.index); |
| } |
| wr.wr.next = NULL; |
| wr.remote_addr = riu->raddr; |
| wr.rkey = riu->rkey; |
| wr.wr.num_sge = riu->sge_cnt; |
| wr.wr.sg_list = riu->sge; |
| |
| /* only get completion event for the last rdma wr */ |
| if (i == (n_rdma - 1) && dir == SCST_DATA_WRITE) |
| wr.wr.send_flags = IB_SEND_SIGNALED; |
| |
| ret = ib_post_send(ch->qp, &wr.wr, &bad_wr); |
| #endif |
| if (ret) |
| break; |
| } |
| |
| if (ret) |
| pr_err("%s: ib_post_send() returned %d for %d/%d\n", __func__, |
| ret, i, n_rdma); |
| if (ret && i > 0) { |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| wr.num_sge = 0; |
| wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index); |
| wr.send_flags = IB_SEND_SIGNALED; |
| pr_info("Trying to abort failed RDMA transfer [%d]\n", |
| ioctx->ioctx.index); |
| while (ch->state == CH_LIVE && |
| ib_post_send(ch->qp, &wr, &bad_wr) != 0) { |
| pr_info("Trying to abort failed RDMA transfer [%d]\n", |
| ioctx->ioctx.index); |
| msleep(1000); |
| } |
| #else |
| wr.wr.num_sge = 0; |
| wr.wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index); |
| wr.wr.send_flags = IB_SEND_SIGNALED; |
| pr_info("Trying to abort failed RDMA transfer [%d]\n", |
| ioctx->ioctx.index); |
| while (ch->state == CH_LIVE && |
| ib_post_send(ch->qp, &wr.wr, &bad_wr) != 0) { |
| pr_info("Trying to abort failed RDMA transfer [%d]\n", |
| ioctx->ioctx.index); |
| msleep(1000); |
| } |
| #endif |
| pr_info("Waiting until RDMA abort finished [%d]\n", |
| ioctx->ioctx.index); |
| #ifdef USE_PRE_440_WR_STRUCTURE |
| while (ch->state < CH_DISCONNECTED && !ioctx->rdma_aborted) { |
| pr_info("Waiting until RDMA abort finished [%d]\n", |
| ioctx->ioctx.index); |
| msleep(1000); |
| } |
| #else |
| while (ch->state < CH_DISCONNECTED && !ioctx->rdma_aborted) { |
| pr_info("Waiting until RDMA abort finished [%d]\n", |
| ioctx->ioctx.index); |
| msleep(1000); |
| } |
| #endif |
| pr_info("%s[%d]: done\n", __func__, __LINE__); |
| } |
| |
| out: |
| if (unlikely(ret < 0)) |
| srpt_adjust_sq_wr_avail(ch, n_rdma); |
| return ret; |
| } |
| |
| /* |
| * srpt_xfer_data() - Start data transfer from initiator to target. |
| * |
| * Returns 0, -EAGAIN or -EIO. |
| * |
| * Note: Must not block. |
| */ |
| static int srpt_xfer_data(struct srpt_rdma_ch *ch, |
| struct srpt_send_ioctx *ioctx) |
| { |
| struct scst_cmd *cmd = &ioctx->cmd; |
| int ret; |
| |
| if (scst_cmd_get_tgt_sg(&ioctx->cmd) == &ioctx->imm_sg) { |
| bool res; |
| |
| res = srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, |
| SRPT_STATE_DATA_IN); |
| BUG_ON(!res); |
| WARN_ON_ONCE(!scst_cmd_get_tgt_data_buff_alloced(cmd)); |
| if (cmd->tgt_i_data_buf_alloced && cmd->dh_data_buf_alloced && |
| scst_cmd_get_data_direction(cmd) & SCST_DATA_WRITE) { |
| scst_copy_sg(cmd, SCST_SG_COPY_FROM_TARGET); |
| } |
| scst_rx_data(cmd, SCST_RX_STATUS_SUCCESS, |
| in_irq() ? SCST_CONTEXT_TASKLET : |
| in_softirq() ? SCST_CONTEXT_DIRECT_ATOMIC : |
| SCST_CONTEXT_DIRECT); |
| ret = 0; |
| goto out; |
| } |
| |
| ret = srpt_map_sg_to_ib_sge(ch, ioctx, cmd); |
| if (ret) { |
| pr_err("%s srpt_map_sg_to_ib_sge() ret=%d\n", __func__, ret); |
| ret = -EAGAIN; |
| goto out; |
| } |
| |
| ret = srpt_perform_rdmas(ch, ioctx, scst_cmd_get_data_direction(cmd)); |
| if (ret) { |
| if (ret == -EAGAIN || ret == -ENOMEM) { |
| pr_info("%s: queue full -- ret=%d\n", __func__, ret); |
| ret = -EAGAIN; |
| } else { |
| pr_err("%s: fatal error -- ret=%d\n", __func__, ret); |
| ret = -EIO; |
| } |
| goto out_unmap; |
| } |
| |
| ret = 0; |
| |
| out: |
| return ret; |
| out_unmap: |
| srpt_unmap_sg_to_ib_sge(ch, ioctx); |
| goto out; |
| } |
| |
| /* |
| * srpt_pending_cmd_timeout() - SCST command HCA processing timeout callback. |
| * |
| * Called by the SCST core if no IB completion notification has been received |
| * within RDMA_COMPL_TIMEOUT_S seconds. |
| */ |
| static void srpt_pending_cmd_timeout(struct scst_cmd *cmd) |
| { |
| struct srpt_send_ioctx *ioctx; |
| enum srpt_command_state state; |
| |
| ioctx = scst_cmd_get_tgt_priv(cmd); |
| BUG_ON(!ioctx); |
| |
| state = ioctx->state; |
| switch (state) { |
| case SRPT_STATE_NEW: |
| case SRPT_STATE_DATA_IN: |
| case SRPT_STATE_DONE: |
| /* |
| * srpt_pending_cmd_timeout() should never be invoked for |
| * commands in this state. |
| */ |
| pr_err("Processing SCST command %p (SRPT state %d) took too long -- aborting\n", |
| cmd, state); |
| break; |
| case SRPT_STATE_NEED_DATA: |
| case SRPT_STATE_CMD_RSP_SENT: |
| case SRPT_STATE_MGMT_RSP_SENT: |
| default: |
| pr_err("Command %p: IB completion for idx %u has not been received in time (SRPT command state %d)\n", |
| cmd, ioctx->ioctx.index, state); |
| break; |
| } |
| |
| srpt_abort_cmd(ioctx, SCST_CONTEXT_SAME); |
| } |
| |
| /* |
| * srpt_rdy_to_xfer() - Transfers data from initiator to target. |
| * |
| * Called by the SCST core to transfer data from the initiator to the target |
| * (SCST_DATA_WRITE). Must not block. |
| */ |
| static int srpt_rdy_to_xfer(struct scst_cmd *cmd) |
| { |
| struct srpt_send_ioctx *ioctx = scst_cmd_get_tgt_priv(cmd); |
| enum srpt_command_state prev_cmd_state; |
| int ret; |
| |
| prev_cmd_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); |
| ret = srpt_xfer_data(ioctx->ch, ioctx); |
| |
| switch (ret) { |
| case 0: |
| return SCST_TGT_RES_SUCCESS; |
| case -EAGAIN: |
| srpt_set_cmd_state(ioctx, prev_cmd_state); |
| return SCST_TGT_RES_QUEUE_FULL; |
| default: |
| srpt_set_cmd_state(ioctx, prev_cmd_state); |
| return SCST_TGT_RES_FATAL_ERROR; |
| } |
| } |
| |
| /* |
| * srpt_xmit_response() - Transmits the response to a SCSI command. |
| * |
| * Callback function called by the SCST core. Must not block. Must ensure that |
| * scst_tgt_cmd_done() will get invoked when returning SCST_TGT_RES_SUCCESS. |
| */ |
| static int srpt_xmit_response(struct scst_cmd *cmd) |
| { |
| struct srpt_rdma_ch *ch; |
| struct srpt_send_ioctx *ioctx; |
| enum srpt_command_state state; |
| int ret; |
| scst_data_direction dir; |
| int resp_len; |
| |
| ret = SCST_TGT_RES_SUCCESS; |
| |
| ioctx = scst_cmd_get_tgt_priv(cmd); |
| BUG_ON(!ioctx); |
| |
| ch = scst_sess_get_tgt_priv(scst_cmd_get_session(cmd)); |
| BUG_ON(!ch); |
| |
| state = ioctx->state; |
| switch (state) { |
| case SRPT_STATE_NEW: |
| case SRPT_STATE_DATA_IN: |
| ioctx->state = SRPT_STATE_CMD_RSP_SENT; |
| break; |
| default: |
| WARN(true, "Unexpected command state %d\n", state); |
| break; |
| } |
| |
| if (unlikely(scst_cmd_aborted_on_xmit(cmd))) { |
| srpt_adjust_req_lim(ch, 0, 1); |
| srpt_abort_cmd(ioctx, SCST_CONTEXT_SAME); |
| goto out; |
| } |
| |
| EXTRACHECKS_BUG_ON(scst_cmd_atomic(cmd)); |
| |
| dir = scst_cmd_get_data_direction(cmd); |
| |
| if (cmd->tgt_i_data_buf_alloced && cmd->dh_data_buf_alloced && |
| dir & SCST_DATA_READ) |
| scst_copy_sg(cmd, SCST_SG_COPY_TO_TARGET); |
| |
| /* For read commands, transfer the data to the initiator. */ |
| if (dir == SCST_DATA_READ |
| && scst_cmd_get_adjusted_resp_data_len(cmd)) { |
| ret = srpt_xfer_data(ch, ioctx); |
| if (unlikely(ret != 0)) { |
| srpt_set_cmd_state(ioctx, state); |
| pr_warn("xfer_data failed for tag %llu - %s\n", |
| scst_cmd_get_tag(cmd), |
| ret == -EAGAIN ? "retrying" : |
| "failing"); |
| switch (ret) { |
| case -EAGAIN: |
| ret = SCST_TGT_RES_QUEUE_FULL; |
| break; |
| default: |
| WARN_ONCE(true, |
| "srpt_xfer_data() returned %d\n", |
| ret); |
| fallthrough; |
| case -EIO: |
| ret = SCST_TGT_RES_FATAL_ERROR; |
| break; |
| } |
| goto out; |
| } |
| } |
| |
| ioctx->req_lim_delta = srpt_inc_req_lim(ch); |
| resp_len = srpt_build_cmd_rsp(ch, ioctx, |
| scst_cmd_get_tag(cmd), |
| scst_cmd_get_status(cmd), |
| scst_cmd_get_sense_buffer(cmd), |
| scst_cmd_get_sense_buffer_len(cmd)); |
| |
| if (srpt_post_send(ch, ioctx, resp_len)) { |
| srpt_unmap_sg_to_ib_sge(ch, ioctx); |
| srpt_set_cmd_state(ioctx, state); |
| srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta); |
| pr_warn("sending response failed for tag %llu - retrying\n", |
| scst_cmd_get_tag(cmd)); |
| ret = SCST_TGT_RES_QUEUE_FULL; |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * srpt_tsk_mgmt_done() - SCST callback function that sends back the response |
| * for a task management request. |
| * |
| * Must not block. |
| */ |
| static void srpt_tsk_mgmt_done(struct scst_mgmt_cmd *mcmnd) |
| { |
| struct srpt_rdma_ch *ch; |
| struct srpt_send_ioctx *ioctx; |
| int rsp_len; |
| |
| ioctx = scst_mgmt_cmd_get_tgt_priv(mcmnd); |
| BUG_ON(!ioctx); |
| |
| ch = ioctx->ch; |
| BUG_ON(!ch); |
| |
| pr_debug("tsk_mgmt_done for tag= %lld status=%d\n", ioctx->tsk_mgmt.tag, |
| scst_mgmt_cmd_get_status(mcmnd)); |
| |
| WARN_ON(in_irq()); |
| |
| srpt_set_cmd_state(ioctx, SRPT_STATE_MGMT_RSP_SENT); |
| WARN_ON(ioctx->state == SRPT_STATE_DONE); |
| |
| ioctx->req_lim_delta = srpt_inc_req_lim(ch); |
| rsp_len = srpt_build_tskmgmt_rsp(ch, ioctx, |
| scst_to_srp_tsk_mgmt_status( |
| scst_mgmt_cmd_get_status(mcmnd)), |
| ioctx->tsk_mgmt.tag); |
| /* |
| * Note: the srpt_post_send() call below sends the task management |
| * response asynchronously. It is possible that the SCST core has |
| * already freed the struct scst_mgmt_cmd structure before the |
| * response is sent. This is fine however. |
| */ |
| if (srpt_post_send(ch, ioctx, rsp_len)) { |
| pr_err("Sending SRP_RSP response failed.\n"); |
| srpt_put_send_ioctx(ioctx); |
| srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta); |
| } |
| } |
| |
| /* |
| * srpt_get_initiator_port_transport_id() - SCST TransportID callback function. |
| * |
| * See also SPC-3, section 7.5.4.5, TransportID for initiator ports using SRP. |
| */ |
| static int srpt_get_initiator_port_transport_id(struct scst_tgt *tgt, |
| struct scst_session *sess, uint8_t **transport_id) |
| { |
| struct srpt_rdma_ch *ch; |
| struct spc_rdma_transport_id { |
| uint8_t protocol_identifier; |
| uint8_t reserved[7]; |
| uint8_t i_port_id[16]; |
| }; |
| struct spc_rdma_transport_id *tr_id; |
| int res = SCSI_TRANSPORTID_PROTOCOLID_SRP; |
| |
| if (!sess) |
| goto out; |
| |
| ch = scst_sess_get_tgt_priv(sess); |
| BUG_ON(!ch); |
| |
| BUILD_BUG_ON(sizeof(*tr_id) != 24); |
| |
| res = -ENOMEM; |
| tr_id = kzalloc(sizeof(struct spc_rdma_transport_id), GFP_KERNEL); |
| if (!tr_id) |
| goto out; |
| |
| res = 0; |
| tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP; |
| memcpy(tr_id->i_port_id, ch->nexus->i_port_id, |
| sizeof(tr_id->i_port_id)); |
| |
| *transport_id = (uint8_t *)tr_id; |
| |
| out: |
| return res; |
| } |
| |
| /* |
| * srpt_on_free_cmd() - Free command-private data. |
| * |
| * Called by the SCST core. May be called in IRQ context. |
| */ |
| static void srpt_on_free_cmd(struct scst_cmd *cmd) |
| { |
| struct srpt_send_ioctx *ioctx; |
| |
| ioctx = scst_cmd_get_tgt_priv(cmd); |
| srpt_put_send_ioctx(ioctx); |
| } |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19) |
| /* A vanilla 2.6.19 or older kernel without backported OFED kernel headers. */ |
| static void srpt_refresh_port_work(void *ctx) |
| #else |
| static void srpt_refresh_port_work(struct work_struct *work) |
| #endif |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19) |
| struct srpt_port *sport = ctx; |
| #else |
| struct srpt_port *sport = container_of(work, struct srpt_port, work); |
| #endif |
| |
| srpt_refresh_port(sport); |
| } |
| |
| static int srpt_close_session(struct scst_session *sess) |
| { |
| struct srpt_rdma_ch *ch = scst_sess_get_tgt_priv(sess); |
| struct srpt_port *sport = ch->sport; |
| |
| mutex_lock(&sport->mutex); |
| srpt_disconnect_ch(ch); |
| mutex_unlock(&sport->mutex); |
| |
| return 0; |
| } |
| |
| static bool srpt_ch_list_empty(struct srpt_port *sport) |
| { |
| struct srpt_nexus *nexus; |
| bool res = true; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(nexus, &sport->nexus_list, entry) |
| if (!list_empty(&nexus->ch_list)) |
| res = false; |
| rcu_read_unlock(); |
| |
| return res; |
| } |
| |
| /** |
| * srpt_release_sport - disable login and wait for associated channels |
| * @sport: SRPT HCA port. |
| */ |
| static int srpt_release_sport(struct srpt_port *sport) |
| { |
| struct srpt_nexus *nexus, *next_n; |
| struct srpt_rdma_ch *ch; |
| |
| WARN_ON_ONCE(irqs_disabled()); |
| |
| /* Disallow new logins and close all active sessions. */ |
| mutex_lock(&sport->mutex); |
| sport->enabled = false; |
| __srpt_close_all_ch(sport); |
| mutex_unlock(&sport->mutex); |
| |
| while (wait_event_timeout(sport->ch_releaseQ, |
| srpt_ch_list_empty(sport), 5 * HZ) <= 0) { |
| pr_info("%s: waiting for session unregistration ...\n", |
| sport->scst_tgt->tgt_name); |
| rcu_read_lock(); |
| list_for_each_entry_rcu(nexus, &sport->nexus_list, entry) { |
| list_for_each_entry(ch, &nexus->ch_list, list) { |
| pr_info("%s-%d: state %s; %d commands in progress\n", |
| ch->sess_name, ch->qp->qp_num, |
| get_ch_state_name(ch->state), |
| atomic_read(&ch->sess->sess_cmd_count)); |
| } |
| } |
| rcu_read_unlock(); |
| } |
| |
| mutex_lock(&sport->mutex); |
| list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) { |
| list_del_rcu(&nexus->entry); |
| kfree_rcu(nexus, rcu); |
| } |
| mutex_unlock(&sport->mutex); |
| |
| return 0; |
| } |
| |
| /* |
| * srpt_release() - Free the resources associated with an SCST target. |
| * |
| * Callback function called by the SCST core from scst_unregister_target(). |
| */ |
| static int srpt_release(struct scst_tgt *scst_tgt) |
| { |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| |
| EXTRACHECKS_WARN_ON_ONCE(irqs_disabled()); |
| |
| BUG_ON(!scst_tgt); |
| BUG_ON(!sport); |
| |
| srpt_release_sport(sport); |
| |
| scst_tgt_set_tgt_priv(scst_tgt, NULL); |
| |
| return 0; |
| } |
| |
| /* |
| * srpt_get_scsi_transport_version() - Returns the SCSI transport version. |
| * This function is called from scst_pres.c, the code that implements |
| * persistent reservation support. |
| */ |
| static uint16_t srpt_get_scsi_transport_version(struct scst_tgt *scst_tgt) |
| { |
| return 0x0940; /* SRP */ |
| } |
| |
| static ssize_t show_comp_v_mask(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28) |
| res = cpumask_scnprintf(buf, PAGE_SIZE, sport->comp_v_mask); |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) |
| res = cpumask_scnprintf(buf, PAGE_SIZE, &sport->comp_v_mask); |
| #else |
| res = scnprintf(buf, PAGE_SIZE, "%*pb", |
| cpumask_pr_args(&sport->comp_v_mask)); |
| #endif |
| res += scnprintf(&buf[res], PAGE_SIZE - res, "\n%s\n", |
| SCST_SYSFS_KEY_MARK); |
| |
| out: |
| return res; |
| } |
| |
| static ssize_t store_comp_v_mask(struct kobject *kobj, |
| struct kobj_attribute *attr, const char *buf, |
| size_t count) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| struct srpt_device *sdev; |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| cpumask_var_t mask; |
| unsigned int i1, i2; |
| |
| if (!sport) |
| goto out; |
| sdev = sport->sdev; |
| res = -ENOMEM; |
| if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
| goto out; |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0) |
| res = bitmap_parse(buf, count, cpumask_bits(mask), nr_cpumask_bits); |
| #else |
| res = cpumask_parse(buf, mask); |
| #endif |
| if (res) |
| goto free_mask; |
| res = -EINVAL; |
| i1 = cpumask_next(-1, mask); |
| i2 = cpumask_next(sdev->device->num_comp_vectors - 1, mask); |
| if (i1 >= nr_cpu_ids || |
| (i2 >= sdev->device->num_comp_vectors && i2 < nr_cpu_ids)) |
| goto free_mask; |
| cpumask_copy(&sport->comp_v_mask, mask); |
| res = count; |
| |
| free_mask: |
| free_cpumask_var(mask); |
| out: |
| return res; |
| } |
| |
| static struct kobj_attribute srpt_show_comp_v_mask_attr = |
| __ATTR(comp_v_mask, S_IRUGO | S_IWUSR, show_comp_v_mask, |
| store_comp_v_mask); |
| |
| static ssize_t srpt_show_device(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| struct srpt_device *sdev; |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| |
| sdev = sport->sdev; |
| res = sprintf(buf, "%s\n", dev_name(&sdev->device->dev)); |
| |
| out: |
| return res; |
| } |
| |
| static struct kobj_attribute srpt_device_attr = |
| __ATTR(device, S_IRUGO, srpt_show_device, NULL); |
| |
| /* |
| * The link layer names in this function match those used by the IB core. |
| * See also link_layer_show() in drivers/infiniband/core/sysfs.c |
| */ |
| static ssize_t srpt_show_link_layer(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| const char *lln = "Unknown"; |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) /* commit a3f5adaf4 */ |
| switch (rdma_port_get_link_layer(sport->sdev->device, sport->port)) { |
| case IB_LINK_LAYER_INFINIBAND: |
| lln = "InfiniBand"; |
| break; |
| case IB_LINK_LAYER_ETHERNET: |
| lln = "Ethernet"; |
| break; |
| case IB_LINK_LAYER_UNSPECIFIED: |
| default: |
| break; |
| } |
| #endif |
| res = sprintf(buf, "%s\n", lln); |
| |
| out: |
| return res; |
| } |
| |
| static struct kobj_attribute srpt_link_layer_attr = |
| __ATTR(link_layer, S_IRUGO, srpt_show_link_layer, NULL); |
| |
| static ssize_t show_port_id(struct kobject *kobj, struct kobj_attribute *attr, |
| char *buf) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| |
| mutex_lock(&sport->mutex); |
| snprintf(buf, PAGE_SIZE, "%s\n%s", sport->port_id, |
| strcmp(sport->port_id, DEFAULT_SRPT_ID_STRING) ? |
| SCST_SYSFS_KEY_MARK "\n" : ""); |
| mutex_unlock(&sport->mutex); |
| |
| res = strlen(buf); |
| |
| out: |
| return res; |
| } |
| |
| static ssize_t store_port_id(struct kobject *kobj, struct kobj_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| const char *end; |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| |
| end = buf + count; |
| while (end > buf && isspace(((unsigned char *)end)[-1])) |
| --end; |
| res = -E2BIG; |
| if (end - buf >= sizeof(sport->port_id)) |
| goto out; |
| |
| mutex_lock(&sport->mutex); |
| sprintf(sport->port_id, "%.*s", (int)(end - buf), buf); |
| mutex_unlock(&sport->mutex); |
| |
| res = count; |
| |
| out: |
| return res; |
| } |
| |
| static struct kobj_attribute srpt_port_id_attr = |
| __ATTR(port_id, S_IRUGO | S_IWUSR, show_port_id, store_port_id); |
| |
| static ssize_t show_login_info(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_tgt *scst_tgt = container_of(kobj, struct scst_tgt, |
| tgt_kobj); |
| struct srpt_port *sport = scst_tgt_get_tgt_priv(scst_tgt); |
| int res = -E_TGT_PRIV_NOT_YET_SET; |
| |
| if (!sport) |
| goto out; |
| |
| res = sprintf(buf, |
| "tid_ext=%016llx,ioc_guid=%016llx,pkey=ffff," |
| "dgid=%04x%04x%04x%04x%04x%04x%04x%04x," |
| "service_id=%016llx\n", |
| srpt_service_guid, srpt_service_guid, |
| be16_to_cpu(((__be16 *) sport->gid.raw)[0]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[1]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[2]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[3]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[4]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[5]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[6]), |
| be16_to_cpu(((__be16 *) sport->gid.raw)[7]), |
| srpt_service_guid); |
| |
| out: |
| return res; |
| } |
| |
| static struct kobj_attribute srpt_show_login_info_attr = |
| __ATTR(login_info, S_IRUGO, show_login_info, NULL); |
| |
| static const struct attribute *srpt_tgt_attrs[] = { |
| &srpt_show_comp_v_mask_attr.attr, |
| &srpt_device_attr.attr, |
| &srpt_link_layer_attr.attr, |
| &srpt_port_id_attr.attr, |
| &srpt_show_login_info_attr.attr, |
| NULL |
| }; |
| |
| static ssize_t show_req_lim(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_session *sess; |
| struct srpt_rdma_ch *ch; |
| |
| sess = container_of(kobj, struct scst_session, sess_kobj); |
| ch = scst_sess_get_tgt_priv(sess); |
| if (!ch) |
| return -ENOENT; |
| return sprintf(buf, "%d\n", ch->req_lim); |
| } |
| |
| static ssize_t show_req_lim_delta(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_session *sess; |
| struct srpt_rdma_ch *ch; |
| |
| sess = container_of(kobj, struct scst_session, sess_kobj); |
| ch = scst_sess_get_tgt_priv(sess); |
| if (!ch) |
| return -ENOENT; |
| return sprintf(buf, "%d\n", ch->req_lim_delta); |
| } |
| |
| static ssize_t show_ch_state(struct kobject *kobj, struct kobj_attribute *attr, |
| char *buf) |
| { |
| struct scst_session *sess; |
| struct srpt_rdma_ch *ch; |
| |
| sess = container_of(kobj, struct scst_session, sess_kobj); |
| ch = scst_sess_get_tgt_priv(sess); |
| if (!ch) |
| return -ENOENT; |
| return sprintf(buf, "%s\n", get_ch_state_name(ch->state)); |
| } |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) || defined(RHEL_RELEASE_CODE) |
| static ssize_t show_comp_vector(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct scst_session *sess; |
| struct srpt_rdma_ch *ch; |
| |
| sess = container_of(kobj, struct scst_session, sess_kobj); |
| ch = scst_sess_get_tgt_priv(sess); |
| return ch ? sprintf(buf, "%u\n", ch->comp_vector) : -ENOENT; |
| } |
| #endif |
| |
| static const struct kobj_attribute srpt_req_lim_attr = |
| __ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
| static const struct kobj_attribute srpt_req_lim_delta_attr = |
| __ATTR(req_lim_delta, S_IRUGO, show_req_lim_delta, NULL); |
| static const struct kobj_attribute srpt_ch_state_attr = |
| __ATTR(ch_state, S_IRUGO, show_ch_state, NULL); |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) || defined(RHEL_RELEASE_CODE) |
| static const struct kobj_attribute srpt_comp_vector_attr = |
| __ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL); |
| #endif |
| |
| static const struct attribute *srpt_sess_attrs[] = { |
| &srpt_req_lim_attr.attr, |
| &srpt_req_lim_delta_attr.attr, |
| &srpt_ch_state_attr.attr, |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) || defined(RHEL_RELEASE_CODE) |
| &srpt_comp_vector_attr.attr, |
| #endif |
| NULL |
| }; |
| |
| /* SCST target template for the SRP target implementation. */ |
| static struct scst_tgt_template srpt_template = { |
| .name = DRV_NAME, |
| .sg_tablesize = 1 << 16, |
| .use_clustering = true, |
| .max_hw_pending_time = RDMA_COMPL_TIMEOUT_S, |
| .enable_target = srpt_enable_target, |
| .is_target_enabled = srpt_is_target_enabled, |
| .tgt_attrs = srpt_tgt_attrs, |
| .sess_attrs = srpt_sess_attrs, |
| .release = srpt_release, |
| .close_session = srpt_close_session, |
| .xmit_response = srpt_xmit_response, |
| .rdy_to_xfer = srpt_rdy_to_xfer, |
| .on_hw_pending_cmd_timeout = srpt_pending_cmd_timeout, |
| .on_free_cmd = srpt_on_free_cmd, |
| .task_mgmt_fn_done = srpt_tsk_mgmt_done, |
| .get_initiator_port_transport_id = srpt_get_initiator_port_transport_id, |
| .get_scsi_transport_version = srpt_get_scsi_transport_version, |
| }; |
| |
| |
| /* Note: the caller must have zero-initialized *@sport. */ |
| static void srpt_init_sport(struct srpt_port *sport, struct ib_device *ib_dev) |
| { |
| int i; |
| |
| INIT_LIST_HEAD(&sport->nexus_list); |
| init_waitqueue_head(&sport->ch_releaseQ); |
| mutex_init(&sport->mutex); |
| strlcpy(sport->port_id, DEFAULT_SRPT_ID_STRING, |
| sizeof(sport->port_id)); |
| for (i = 0; i < ib_dev->num_comp_vectors; i++) |
| cpumask_set_cpu(i, &sport->comp_v_mask); |
| } |
| |
| /* |
| * srpt_add_one() - Infiniband device addition callback function. |
| */ |
| static int srpt_add_one(struct ib_device *device) |
| { |
| struct ib_cm_id *cm_id; |
| struct srpt_device *sdev; |
| struct srpt_port *sport; |
| struct ib_srq_init_attr srq_attr; |
| int i, ret; |
| |
| pr_debug("device = %p\n", device); |
| |
| sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); |
| if (!sdev) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| sdev->device = device; |
| |
| #ifdef HAVE_IB_QUERY_DEVICE |
| ret = ib_query_device(device, &sdev->dev_attr); |
| if (ret) { |
| pr_err("ib_query_device() failed: %d\n", ret); |
| goto free_dev; |
| } |
| #else |
| sdev->dev_attr = device->attrs; |
| #endif |
| |
| sdev->pd = ib_alloc_pd(device, 0); |
| if (IS_ERR(sdev->pd)) { |
| ret = PTR_ERR(sdev->pd); |
| pr_err("ib_alloc_pd() failed: %d\n", ret); |
| goto free_dev; |
| } |
| |
| #ifndef IB_PD_HAS_LOCAL_DMA_LKEY |
| sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE); |
| if (IS_ERR(sdev->mr)) { |
| ret = PTR_ERR(sdev->mr); |
| pr_err("ib_get_dma_mr() failed: %ld\n", PTR_ERR(sdev->mr)); |
| goto err_pd; |
| } |
| sdev->lkey = sdev->mr->lkey; |
| #else |
| sdev->lkey = sdev->pd->local_dma_lkey; |
| #endif |
| |
| sdev->srq_size = min(max(srpt_srq_size, MIN_SRPT_SRQ_SIZE), |
| sdev->dev_attr.max_srq_wr); |
| |
| memset(&srq_attr, 0, sizeof(srq_attr)); |
| srq_attr.event_handler = srpt_srq_event; |
| srq_attr.srq_context = (void *)sdev; |
| srq_attr.attr.max_wr = sdev->srq_size; |
| srq_attr.attr.max_sge = 1; |
| srq_attr.attr.srq_limit = 0; |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0) |
| srq_attr.srq_type = IB_SRQT_BASIC; |
| #endif |
| |
| sdev->srq = use_srq ? ib_create_srq(sdev->pd, &srq_attr) : |
| ERR_PTR(-EOPNOTSUPP); |
| if (IS_ERR(sdev->srq)) { |
| if (use_srq) |
| pr_debug("ib_create_srq() failed: %ld\n", |
| PTR_ERR(sdev->srq)); |
| |
| /* SRQ disabled or not supported. */ |
| sdev->use_srq = false; |
| } else { |
| pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", |
| sdev->srq_size, sdev->dev_attr.max_srq_wr, |
| device->name); |
| |
| sdev->req_buf_cache = kmem_cache_create("srpt-srq-req-buf", |
| srp_max_req_size, 0, 0, NULL); |
| if (!sdev->req_buf_cache) { |
| ret = -ENOMEM; |
| goto free_srq; |
| } |
| |
| sdev->ioctx_ring = (struct srpt_recv_ioctx **) |
| srpt_alloc_ioctx_ring(sdev, sdev->srq_size, |
| sizeof(*sdev->ioctx_ring[0]), |
| sdev->req_buf_cache, |
| 0, DMA_FROM_DEVICE); |
| if (!sdev->ioctx_ring) { |
| ret = -ENOMEM; |
| pr_err("srpt_alloc_ioctx_ring() failed\n"); |
| goto free_cache; |
| } |
| |
| sdev->use_srq = true; |
| |
| for (i = 0; i < sdev->srq_size; ++i) { |
| INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list); |
| srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]); |
| } |
| } |
| |
| WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); |
| |
| for (i = 1; i <= sdev->device->phys_port_cnt; i++) { |
| sport = &sdev->port[i - 1]; |
| sport->sdev = sdev; |
| sport->port = i; |
| srpt_init_sport(sport, sdev->device); |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19) |
| /* |
| * A vanilla 2.6.19 or older kernel without backported OFED |
| * kernel headers. |
| */ |
| INIT_WORK(&sport->work, srpt_refresh_port_work, sport); |
| #else |
| INIT_WORK(&sport->work, srpt_refresh_port_work); |
| #endif |
| ret = srpt_refresh_port(sport); |
| if (ret) { |
| pr_err("MAD registration failed for %s-%d.\n", |
| dev_name(&sdev->device->dev), i); |
| goto err_ring; |
| } |
| } |
| |
| if (!srpt_service_guid) |
| srpt_service_guid = be64_to_cpu(device->node_guid) & |
| ~be64_to_cpu(IB_SERVICE_ID_AGN_MASK); |
| |
| cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); |
| if (IS_ERR(cm_id)) { |
| ret = PTR_ERR(cm_id); |
| pr_err("ib_create_cm_id() failed: %d\n", ret); |
| goto err_ring; |
| } |
| sdev->cm_id = cm_id; |
| |
| /* print out target login information */ |
| pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n", |
| srpt_service_guid, srpt_service_guid, srpt_service_guid); |
| |
| /* |
| * We do not have a consistent service_id (ie. also id_ext of target_id) |
| * to identify this target. We currently use the guid of the first HCA |
| * in the system as service_id; therefore, the target_id will change |
| * if this HCA is gone bad and replaced by different HCA |
| */ |
| ret = ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0 |
| #ifdef IB_CM_LISTEN_TAKES_FOURTH_ARG |
| , NULL |
| #endif |
| ); |
| if (ret) { |
| pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret, |
| sdev->cm_id->state); |
| goto err_cm; |
| } |
| |
| INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, |
| srpt_event_handler); |
| ib_register_event_handler(&sdev->event_handler); |
| atomic_inc(&srpt_device_count); |
| ret = 0; |
| out: |
| ib_set_client_data(device, &srpt_client, sdev); |
| |
| return ret; |
| |
| err_cm: |
| ib_destroy_cm_id(sdev->cm_id); |
| err_ring: |
| srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, |
| sdev->srq_size, sdev->req_buf_cache, |
| DMA_FROM_DEVICE); |
| free_cache: |
| kmem_cache_destroy(sdev->req_buf_cache); |
| |
| free_srq: |
| if (sdev->use_srq) |
| ib_destroy_srq(sdev->srq); |
| |
| #ifndef IB_PD_HAS_LOCAL_DMA_LKEY |
| ib_dereg_mr(sdev->mr); |
| err_pd: |
| #endif |
| ib_dealloc_pd(sdev->pd); |
| free_dev: |
| kfree(sdev); |
| err: |
| sdev = NULL; |
| pr_info("%s(%s) failed.\n", __func__, device->name); |
| goto out; |
| } |
| |
| #if !IB_CLIENT_ADD_ONE_RETURNS_INT |
| static void srpt_add_one_void(struct ib_device *device) |
| { |
| srpt_add_one(device); |
| } |
| #endif |
| |
| /* |
| * srpt_remove_one() - InfiniBand device removal callback function. |
| */ |
| #ifndef IB_CLIENT_REMOVE_TAKES_TWO_ARGS |
| static void srpt_remove_one(struct ib_device *device) |
| { |
| void *client_data = ib_get_client_data(device, &srpt_client); |
| #else |
| static void srpt_remove_one(struct ib_device *device, void *client_data) |
| { |
| #endif |
| struct srpt_device *sdev; |
| int i; |
| |
| sdev = client_data; |
| if (!sdev) { |
| pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
| return; |
| } |
| |
| srpt_unregister_mad_agent(sdev); |
| |
| ib_unregister_event_handler(&sdev->event_handler); |
| |
| /* Cancel any work queued by the just unregistered IB event handler. */ |
| for (i = 0; i < sdev->device->phys_port_cnt; i++) |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22) |
| cancel_work_sync(&sdev->port[i].work); |
| #else |
| /* |
| * cancel_work_sync() was introduced in kernel 2.6.22. Older |
| * kernels do not have a facility to cancel scheduled work, so |
| * wait until the scheduled work finished. |
| */ |
| flush_scheduled_work(); |
| #endif |
| |
| ib_destroy_cm_id(sdev->cm_id); |
| |
| ib_set_client_data(device, &srpt_client, NULL); |
| |
| /* |
| * SCST target unregistration must happen after sdev->cm_id has been |
| * destroyed and after the client data has been reset such that no new |
| * SRP_LOGIN_REQ information units can arrive while unregistering the |
| * SCST target. |
| */ |
| for (i = 0; i < sdev->device->phys_port_cnt; i++) { |
| struct srpt_port *sport = &sdev->port[i]; |
| |
| if (sport->scst_tgt) { |
| scst_unregister_target(sport->scst_tgt); |
| sport->scst_tgt = NULL; |
| } |
| } |
| |
| if (sdev->use_srq) |
| ib_destroy_srq(sdev->srq); |
| srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, |
| sdev->srq_size, sdev->req_buf_cache, |
| DMA_FROM_DEVICE); |
| kmem_cache_destroy(sdev->req_buf_cache); |
| #ifndef IB_PD_HAS_LOCAL_DMA_LKEY |
| ib_dereg_mr(sdev->mr); |
| #endif |
| ib_dealloc_pd(sdev->pd); |
| |
| kfree(sdev); |
| } |
| |
| static struct ib_client srpt_client = { |
| .name = DRV_NAME, |
| #if IB_CLIENT_ADD_ONE_RETURNS_INT |
| .add = srpt_add_one, |
| #else |
| .add = srpt_add_one_void, |
| #endif |
| .remove = srpt_remove_one |
| }; |
| |
| |
| /** |
| * srpt_init_module - kernel module initialization |
| * |
| * Note: Since ib_register_client() registers callback functions, and since at |
| * least one of these callback functions (srpt_add_one()) calls target core |
| * functions, this driver must be registered with the target core before |
| * ib_register_client() is called. |
| */ |
| static int __init srpt_init_module(void) |
| { |
| int ret; |
| |
| ret = -EINVAL; |
| if (srp_max_req_size < MIN_MAX_REQ_SIZE) { |
| pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n", |
| srp_max_req_size, MIN_MAX_REQ_SIZE); |
| goto out; |
| } |
| |
| if (srp_max_rsp_size < MIN_MAX_RSP_SIZE) { |
| pr_err("invalid value %d for kernel module parameter srp_max_rsp_size -- must be at least %d.\n", |
| srp_max_rsp_size, MIN_MAX_RSP_SIZE); |
| goto out; |
| } |
| |
| if (srpt_srq_size < MIN_SRPT_SRQ_SIZE |
| || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { |
| pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n", |
| srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); |
| goto out; |
| } |
| |
| if (srpt_sq_size < MIN_SRPT_SQ_SIZE) { |
| pr_err("invalid value %d for kernel module parameter srpt_sq_size -- must be at least %d.\n", |
| srpt_sq_size, MIN_SRPT_SQ_SIZE); |
| goto out; |
| } |
| |
| ret = scst_register_target_template(&srpt_template); |
| if (ret < 0) { |
| pr_err("couldn't register target template\n"); |
| ret = -ENODEV; |
| goto out; |
| } |
| |
| srpt_wq = alloc_workqueue("srpt", WQ_SYSFS | WQ_NON_REENTRANT, 0); |
| if (!srpt_wq) { |
| pr_err("Couldn't allocate the ib_srpt workqueue\n"); |
| ret = -ENOMEM; |
| goto out_unregister_target; |
| } |
| |
| ret = ib_register_client(&srpt_client); |
| if (ret) { |
| pr_err("couldn't register IB client\n"); |
| goto destroy_wq; |
| } |
| |
| srpt_net_ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET); |
| |
| if (rdma_cm_port) { |
| struct sockaddr_in addr; |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 0, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6) |
| rdma_cm_id = rdma_create_id(srpt_rdma_cm_handler, NULL, |
| RDMA_PS_TCP); |
| #elif !RDMA_CREATE_ID_TAKES_NET_ARG |
| rdma_cm_id = rdma_create_id(srpt_rdma_cm_handler, NULL, |
| RDMA_PS_TCP, IB_QPT_RC); |
| #else |
| rdma_cm_id = rdma_create_id(srpt_net_ns, srpt_rdma_cm_handler, |
| NULL, RDMA_PS_TCP, IB_QPT_RC); |
| #endif |
| if (IS_ERR(rdma_cm_id)) { |
| ret = PTR_ERR(rdma_cm_id); |
| rdma_cm_id = NULL; |
| pr_err("RDMA/CM ID creation failed\n"); |
| goto drop_ns; |
| } |
| |
| /* We will listen on any RDMA device. */ |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_port = cpu_to_be16(rdma_cm_port); |
| ret = rdma_bind_addr(rdma_cm_id, (void *)&addr); |
| if (ret) { |
| pr_err("Binding RDMA/CM ID to port %u failed\n", |
| rdma_cm_port); |
| goto destroy_id; |
| } |
| |
| ret = rdma_listen(rdma_cm_id, 128); |
| if (ret) { |
| pr_err("rdma_listen() failed\n"); |
| goto destroy_id; |
| } |
| } |
| |
| return 0; |
| |
| destroy_id: |
| if (rdma_cm_id) |
| rdma_destroy_id(rdma_cm_id); |
| |
| drop_ns: |
| kobj_ns_drop(KOBJ_NS_TYPE_NET, srpt_net_ns); |
| srpt_net_ns = NULL; |
| ib_unregister_client(&srpt_client); |
| |
| destroy_wq: |
| destroy_workqueue(srpt_wq); |
| |
| out_unregister_target: |
| scst_unregister_target_template(&srpt_template); |
| |
| out: |
| return ret; |
| } |
| |
| static void __exit srpt_cleanup_module(void) |
| { |
| if (rdma_cm_id) |
| rdma_destroy_id(rdma_cm_id); |
| |
| kobj_ns_drop(KOBJ_NS_TYPE_NET, srpt_net_ns); |
| srpt_net_ns = NULL; |
| |
| ib_unregister_client(&srpt_client); |
| |
| destroy_workqueue(srpt_wq); |
| |
| rcu_barrier(); |
| |
| scst_unregister_target_template(&srpt_template); |
| } |
| |
| module_init(srpt_init_module); |
| module_exit(srpt_cleanup_module); |