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1/*2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.4 *5 * This software is available to you under a choice of one of two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * provided with the distribution.23 *24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * SOFTWARE.32 *33 */34 35#include <linux/module.h>36#include <linux/init.h>37#include <linux/slab.h>38#include <linux/err.h>39#include <linux/ctype.h>40#include <linux/kthread.h>41#include <linux/string.h>42#include <linux/delay.h>43#include <linux/atomic.h>44#include <linux/inet.h>45#include <rdma/ib_cache.h>46#include <scsi/scsi_proto.h>47#include <scsi/scsi_tcq.h>48#include <target/target_core_base.h>49#include <target/target_core_fabric.h>50#include "ib_srpt.h"51 52/* Name of this kernel module. */53#define DRV_NAME "ib_srpt"54 55#define SRPT_ID_STRING "Linux SRP target"56 57#undef pr_fmt58#define pr_fmt(fmt) DRV_NAME " " fmt59 60MODULE_AUTHOR("Vu Pham and Bart Van Assche");61MODULE_DESCRIPTION("SCSI RDMA Protocol target driver");62MODULE_LICENSE("Dual BSD/GPL");63 64/*65 * Global Variables66 */67 68static u64 srpt_service_guid;69static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */70static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */71static DEFINE_MUTEX(srpt_mc_mutex); /* Protects srpt_memory_caches. */72static DEFINE_XARRAY(srpt_memory_caches); /* See also srpt_memory_cache_entry */73 74static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;75module_param(srp_max_req_size, int, 0444);76MODULE_PARM_DESC(srp_max_req_size,77 "Maximum size of SRP request messages in bytes.");78 79static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;80module_param(srpt_srq_size, int, 0444);81MODULE_PARM_DESC(srpt_srq_size,82 "Shared receive queue (SRQ) size.");83 84static int srpt_set_u64_x(const char *buffer, const struct kernel_param *kp)85{86 return kstrtou64(buffer, 16, (u64 *)kp->arg);87}88static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)89{90 return sprintf(buffer, "0x%016llx\n", *(u64 *)kp->arg);91}92module_param_call(srpt_service_guid, srpt_set_u64_x, srpt_get_u64_x,93 &srpt_service_guid, 0444);94MODULE_PARM_DESC(srpt_service_guid,95 "Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA.");96 97static struct ib_client srpt_client;98/* Protects both rdma_cm_port and rdma_cm_id. */99static DEFINE_MUTEX(rdma_cm_mutex);100/* Port number RDMA/CM will bind to. */101static u16 rdma_cm_port;102static struct rdma_cm_id *rdma_cm_id;103static void srpt_release_cmd(struct se_cmd *se_cmd);104static void srpt_free_ch(struct kref *kref);105static int srpt_queue_status(struct se_cmd *cmd);106static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);107static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);108static void srpt_process_wait_list(struct srpt_rdma_ch *ch);109 110/* Type of the entries in srpt_memory_caches. */111struct srpt_memory_cache_entry {112 refcount_t ref;113 struct kmem_cache *c;114};115 116static struct kmem_cache *srpt_cache_get(unsigned int object_size)117{118 struct srpt_memory_cache_entry *e;119 char name[32];120 void *res;121 122 guard(mutex)(&srpt_mc_mutex);123 e = xa_load(&srpt_memory_caches, object_size);124 if (e) {125 refcount_inc(&e->ref);126 return e->c;127 }128 snprintf(name, sizeof(name), "srpt-%u", object_size);129 e = kmalloc(sizeof(*e), GFP_KERNEL);130 if (!e)131 return NULL;132 refcount_set(&e->ref, 1);133 e->c = kmem_cache_create(name, object_size, /*align=*/512, 0, NULL);134 if (!e->c)135 goto free_entry;136 res = xa_store(&srpt_memory_caches, object_size, e, GFP_KERNEL);137 if (xa_is_err(res))138 goto destroy_cache;139 return e->c;140 141destroy_cache:142 kmem_cache_destroy(e->c);143 144free_entry:145 kfree(e);146 return NULL;147}148 149static void srpt_cache_put(struct kmem_cache *c)150{151 struct srpt_memory_cache_entry *e = NULL;152 unsigned long object_size;153 154 guard(mutex)(&srpt_mc_mutex);155 xa_for_each(&srpt_memory_caches, object_size, e)156 if (e->c == c)157 break;158 if (WARN_ON_ONCE(!e))159 return;160 if (!refcount_dec_and_test(&e->ref))161 return;162 WARN_ON_ONCE(xa_erase(&srpt_memory_caches, object_size) != e);163 kmem_cache_destroy(e->c);164 kfree(e);165}166 167/*168 * The only allowed channel state changes are those that change the channel169 * state into a state with a higher numerical value. Hence the new > prev test.170 */171static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)172{173 unsigned long flags;174 enum rdma_ch_state prev;175 bool changed = false;176 177 spin_lock_irqsave(&ch->spinlock, flags);178 prev = ch->state;179 if (new > prev) {180 ch->state = new;181 changed = true;182 }183 spin_unlock_irqrestore(&ch->spinlock, flags);184 185 return changed;186}187 188/**189 * srpt_event_handler - asynchronous IB event callback function190 * @handler: IB event handler registered by ib_register_event_handler().191 * @event: Description of the event that occurred.192 *193 * Callback function called by the InfiniBand core when an asynchronous IB194 * event occurs. This callback may occur in interrupt context. See also195 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand196 * Architecture Specification.197 */198static void srpt_event_handler(struct ib_event_handler *handler,199 struct ib_event *event)200{201 struct srpt_device *sdev =202 container_of(handler, struct srpt_device, event_handler);203 struct srpt_port *sport;204 u8 port_num;205 206 pr_debug("ASYNC event= %d on device= %s\n", event->event,207 dev_name(&sdev->device->dev));208 209 switch (event->event) {210 case IB_EVENT_PORT_ERR:211 port_num = event->element.port_num - 1;212 if (port_num < sdev->device->phys_port_cnt) {213 sport = &sdev->port[port_num];214 sport->lid = 0;215 sport->sm_lid = 0;216 } else {217 WARN(true, "event %d: port_num %d out of range 1..%d\n",218 event->event, port_num + 1,219 sdev->device->phys_port_cnt);220 }221 break;222 case IB_EVENT_PORT_ACTIVE:223 case IB_EVENT_LID_CHANGE:224 case IB_EVENT_PKEY_CHANGE:225 case IB_EVENT_SM_CHANGE:226 case IB_EVENT_CLIENT_REREGISTER:227 case IB_EVENT_GID_CHANGE:228 /* Refresh port data asynchronously. */229 port_num = event->element.port_num - 1;230 if (port_num < sdev->device->phys_port_cnt) {231 sport = &sdev->port[port_num];232 if (!sport->lid && !sport->sm_lid)233 schedule_work(&sport->work);234 } else {235 WARN(true, "event %d: port_num %d out of range 1..%d\n",236 event->event, port_num + 1,237 sdev->device->phys_port_cnt);238 }239 break;240 default:241 pr_err("received unrecognized IB event %d\n", event->event);242 break;243 }244}245 246/**247 * srpt_srq_event - SRQ event callback function248 * @event: Description of the event that occurred.249 * @ctx: Context pointer specified at SRQ creation time.250 */251static void srpt_srq_event(struct ib_event *event, void *ctx)252{253 pr_debug("SRQ event %d\n", event->event);254}255 256static const char *get_ch_state_name(enum rdma_ch_state s)257{258 switch (s) {259 case CH_CONNECTING:260 return "connecting";261 case CH_LIVE:262 return "live";263 case CH_DISCONNECTING:264 return "disconnecting";265 case CH_DRAINING:266 return "draining";267 case CH_DISCONNECTED:268 return "disconnected";269 }270 return "???";271}272 273/**274 * srpt_qp_event - QP event callback function275 * @event: Description of the event that occurred.276 * @ptr: SRPT RDMA channel.277 */278static void srpt_qp_event(struct ib_event *event, void *ptr)279{280 struct srpt_rdma_ch *ch = ptr;281 282 pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n",283 event->event, ch, ch->sess_name, ch->qp->qp_num,284 get_ch_state_name(ch->state));285 286 switch (event->event) {287 case IB_EVENT_COMM_EST:288 if (ch->using_rdma_cm)289 rdma_notify(ch->rdma_cm.cm_id, event->event);290 else291 ib_cm_notify(ch->ib_cm.cm_id, event->event);292 break;293 case IB_EVENT_QP_LAST_WQE_REACHED:294 pr_debug("%s-%d, state %s: received Last WQE event.\n",295 ch->sess_name, ch->qp->qp_num,296 get_ch_state_name(ch->state));297 break;298 default:299 pr_err("received unrecognized IB QP event %d\n", event->event);300 break;301 }302}303 304/**305 * srpt_set_ioc - initialize a IOUnitInfo structure306 * @c_list: controller list.307 * @slot: one-based slot number.308 * @value: four-bit value.309 *310 * Copies the lowest four bits of value in element slot of the array of four311 * bit elements called c_list (controller list). The index slot is one-based.312 */313static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)314{315 u16 id;316 u8 tmp;317 318 id = (slot - 1) / 2;319 if (slot & 0x1) {320 tmp = c_list[id] & 0xf;321 c_list[id] = (value << 4) | tmp;322 } else {323 tmp = c_list[id] & 0xf0;324 c_list[id] = (value & 0xf) | tmp;325 }326}327 328/**329 * srpt_get_class_port_info - copy ClassPortInfo to a management datagram330 * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO.331 *332 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture333 * Specification.334 */335static void srpt_get_class_port_info(struct ib_dm_mad *mad)336{337 struct ib_class_port_info *cif;338 339 cif = (struct ib_class_port_info *)mad->data;340 memset(cif, 0, sizeof(*cif));341 cif->base_version = 1;342 cif->class_version = 1;343 344 ib_set_cpi_resp_time(cif, 20);345 mad->mad_hdr.status = 0;346}347 348/**349 * srpt_get_iou - write IOUnitInfo to a management datagram350 * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO.351 *352 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture353 * Specification. See also section B.7, table B.6 in the SRP r16a document.354 */355static void srpt_get_iou(struct ib_dm_mad *mad)356{357 struct ib_dm_iou_info *ioui;358 u8 slot;359 int i;360 361 ioui = (struct ib_dm_iou_info *)mad->data;362 ioui->change_id = cpu_to_be16(1);363 ioui->max_controllers = 16;364 365 /* set present for slot 1 and empty for the rest */366 srpt_set_ioc(ioui->controller_list, 1, 1);367 for (i = 1, slot = 2; i < 16; i++, slot++)368 srpt_set_ioc(ioui->controller_list, slot, 0);369 370 mad->mad_hdr.status = 0;371}372 373/**374 * srpt_get_ioc - write IOControllerprofile to a management datagram375 * @sport: HCA port through which the MAD has been received.376 * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query.377 * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE.378 *379 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand380 * Architecture Specification. See also section B.7, table B.7 in the SRP381 * r16a document.382 */383static void srpt_get_ioc(struct srpt_port *sport, u32 slot,384 struct ib_dm_mad *mad)385{386 struct srpt_device *sdev = sport->sdev;387 struct ib_dm_ioc_profile *iocp;388 int send_queue_depth;389 390 iocp = (struct ib_dm_ioc_profile *)mad->data;391 392 if (!slot || slot > 16) {393 mad->mad_hdr.status394 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);395 return;396 }397 398 if (slot > 2) {399 mad->mad_hdr.status400 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);401 return;402 }403 404 if (sdev->use_srq)405 send_queue_depth = sdev->srq_size;406 else407 send_queue_depth = min(MAX_SRPT_RQ_SIZE,408 sdev->device->attrs.max_qp_wr);409 410 memset(iocp, 0, sizeof(*iocp));411 strcpy(iocp->id_string, SRPT_ID_STRING);412 iocp->guid = cpu_to_be64(srpt_service_guid);413 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);414 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);415 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);416 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);417 iocp->subsys_device_id = 0x0;418 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);419 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);420 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);421 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);422 iocp->send_queue_depth = cpu_to_be16(send_queue_depth);423 iocp->rdma_read_depth = 4;424 iocp->send_size = cpu_to_be32(srp_max_req_size);425 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,426 1U << 24));427 iocp->num_svc_entries = 1;428 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |429 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;430 431 mad->mad_hdr.status = 0;432}433 434/**435 * srpt_get_svc_entries - write ServiceEntries to a management datagram436 * @ioc_guid: I/O controller GUID to use in reply.437 * @slot: I/O controller number.438 * @hi: End of the range of service entries to be specified in the reply.439 * @lo: Start of the range of service entries to be specified in the reply..440 * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES.441 *442 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture443 * Specification. See also section B.7, table B.8 in the SRP r16a document.444 */445static void srpt_get_svc_entries(u64 ioc_guid,446 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)447{448 struct ib_dm_svc_entries *svc_entries;449 450 WARN_ON(!ioc_guid);451 452 if (!slot || slot > 16) {453 mad->mad_hdr.status454 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);455 return;456 }457 458 if (slot > 2 || lo > hi || hi > 1) {459 mad->mad_hdr.status460 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);461 return;462 }463 464 svc_entries = (struct ib_dm_svc_entries *)mad->data;465 memset(svc_entries, 0, sizeof(*svc_entries));466 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);467 snprintf(svc_entries->service_entries[0].name,468 sizeof(svc_entries->service_entries[0].name),469 "%s%016llx",470 SRP_SERVICE_NAME_PREFIX,471 ioc_guid);472 473 mad->mad_hdr.status = 0;474}475 476/**477 * srpt_mgmt_method_get - process a received management datagram478 * @sp: HCA port through which the MAD has been received.479 * @rq_mad: received MAD.480 * @rsp_mad: response MAD.481 */482static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,483 struct ib_dm_mad *rsp_mad)484{485 u16 attr_id;486 u32 slot;487 u8 hi, lo;488 489 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);490 switch (attr_id) {491 case DM_ATTR_CLASS_PORT_INFO:492 srpt_get_class_port_info(rsp_mad);493 break;494 case DM_ATTR_IOU_INFO:495 srpt_get_iou(rsp_mad);496 break;497 case DM_ATTR_IOC_PROFILE:498 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);499 srpt_get_ioc(sp, slot, rsp_mad);500 break;501 case DM_ATTR_SVC_ENTRIES:502 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);503 hi = (u8) ((slot >> 8) & 0xff);504 lo = (u8) (slot & 0xff);505 slot = (u16) ((slot >> 16) & 0xffff);506 srpt_get_svc_entries(srpt_service_guid,507 slot, hi, lo, rsp_mad);508 break;509 default:510 rsp_mad->mad_hdr.status =511 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);512 break;513 }514}515 516/**517 * srpt_mad_send_handler - MAD send completion callback518 * @mad_agent: Return value of ib_register_mad_agent().519 * @mad_wc: Work completion reporting that the MAD has been sent.520 */521static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,522 struct ib_mad_send_wc *mad_wc)523{524 rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);525 ib_free_send_mad(mad_wc->send_buf);526}527 528/**529 * srpt_mad_recv_handler - MAD reception callback function530 * @mad_agent: Return value of ib_register_mad_agent().531 * @send_buf: Not used.532 * @mad_wc: Work completion reporting that a MAD has been received.533 */534static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,535 struct ib_mad_send_buf *send_buf,536 struct ib_mad_recv_wc *mad_wc)537{538 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;539 struct ib_ah *ah;540 struct ib_mad_send_buf *rsp;541 struct ib_dm_mad *dm_mad;542 543 if (!mad_wc || !mad_wc->recv_buf.mad)544 return;545 546 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,547 mad_wc->recv_buf.grh, mad_agent->port_num);548 if (IS_ERR(ah))549 goto err;550 551 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);552 553 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,554 mad_wc->wc->pkey_index, 0,555 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,556 GFP_KERNEL,557 IB_MGMT_BASE_VERSION);558 if (IS_ERR(rsp))559 goto err_rsp;560 561 rsp->ah = ah;562 563 dm_mad = rsp->mad;564 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));565 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;566 dm_mad->mad_hdr.status = 0;567 568 switch (mad_wc->recv_buf.mad->mad_hdr.method) {569 case IB_MGMT_METHOD_GET:570 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);571 break;572 case IB_MGMT_METHOD_SET:573 dm_mad->mad_hdr.status =574 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);575 break;576 default:577 dm_mad->mad_hdr.status =578 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);579 break;580 }581 582 if (!ib_post_send_mad(rsp, NULL)) {583 ib_free_recv_mad(mad_wc);584 /* will destroy_ah & free_send_mad in send completion */585 return;586 }587 588 ib_free_send_mad(rsp);589 590err_rsp:591 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);592err:593 ib_free_recv_mad(mad_wc);594}595 596static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)597{598 const __be16 *g = (const __be16 *)guid;599 600 return snprintf(buf, size, "%04x:%04x:%04x:%04x",601 be16_to_cpu(g[0]), be16_to_cpu(g[1]),602 be16_to_cpu(g[2]), be16_to_cpu(g[3]));603}604 605/**606 * srpt_refresh_port - configure a HCA port607 * @sport: SRPT HCA port.608 *609 * Enable InfiniBand management datagram processing, update the cached sm_lid,610 * lid and gid values, and register a callback function for processing MADs611 * on the specified port.612 *613 * Note: It is safe to call this function more than once for the same port.614 */615static int srpt_refresh_port(struct srpt_port *sport)616{617 struct ib_mad_agent *mad_agent;618 struct ib_mad_reg_req reg_req;619 struct ib_port_modify port_modify;620 struct ib_port_attr port_attr;621 int ret;622 623 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);624 if (ret)625 return ret;626 627 sport->sm_lid = port_attr.sm_lid;628 sport->lid = port_attr.lid;629 630 ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);631 if (ret)632 return ret;633 634 srpt_format_guid(sport->guid_name, ARRAY_SIZE(sport->guid_name),635 &sport->gid.global.interface_id);636 snprintf(sport->gid_name, ARRAY_SIZE(sport->gid_name),637 "0x%016llx%016llx",638 be64_to_cpu(sport->gid.global.subnet_prefix),639 be64_to_cpu(sport->gid.global.interface_id));640 641 if (rdma_protocol_iwarp(sport->sdev->device, sport->port))642 return 0;643 644 memset(&port_modify, 0, sizeof(port_modify));645 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;646 port_modify.clr_port_cap_mask = 0;647 648 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);649 if (ret) {650 pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n",651 dev_name(&sport->sdev->device->dev), sport->port, ret);652 return 0;653 }654 655 if (!sport->mad_agent) {656 memset(®_req, 0, sizeof(reg_req));657 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;658 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;659 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);660 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);661 662 mad_agent = ib_register_mad_agent(sport->sdev->device,663 sport->port,664 IB_QPT_GSI,665 ®_req, 0,666 srpt_mad_send_handler,667 srpt_mad_recv_handler,668 sport, 0);669 if (IS_ERR(mad_agent)) {670 pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n",671 dev_name(&sport->sdev->device->dev), sport->port,672 PTR_ERR(mad_agent));673 sport->mad_agent = NULL;674 memset(&port_modify, 0, sizeof(port_modify));675 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;676 ib_modify_port(sport->sdev->device, sport->port, 0,677 &port_modify);678 return 0;679 }680 681 sport->mad_agent = mad_agent;682 }683 684 return 0;685}686 687/**688 * srpt_unregister_mad_agent - unregister MAD callback functions689 * @sdev: SRPT HCA pointer.690 * @port_cnt: number of ports with registered MAD691 *692 * Note: It is safe to call this function more than once for the same device.693 */694static void srpt_unregister_mad_agent(struct srpt_device *sdev, int port_cnt)695{696 struct ib_port_modify port_modify = {697 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,698 };699 struct srpt_port *sport;700 int i;701 702 for (i = 1; i <= port_cnt; i++) {703 sport = &sdev->port[i - 1];704 WARN_ON(sport->port != i);705 if (sport->mad_agent) {706 ib_modify_port(sdev->device, i, 0, &port_modify);707 ib_unregister_mad_agent(sport->mad_agent);708 sport->mad_agent = NULL;709 }710 }711}712 713/**714 * srpt_alloc_ioctx - allocate a SRPT I/O context structure715 * @sdev: SRPT HCA pointer.716 * @ioctx_size: I/O context size.717 * @buf_cache: I/O buffer cache.718 * @dir: DMA data direction.719 */720static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,721 int ioctx_size,722 struct kmem_cache *buf_cache,723 enum dma_data_direction dir)724{725 struct srpt_ioctx *ioctx;726 727 ioctx = kzalloc(ioctx_size, GFP_KERNEL);728 if (!ioctx)729 goto err;730 731 ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL);732 if (!ioctx->buf)733 goto err_free_ioctx;734 735 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf,736 kmem_cache_size(buf_cache), dir);737 if (ib_dma_mapping_error(sdev->device, ioctx->dma))738 goto err_free_buf;739 740 return ioctx;741 742err_free_buf:743 kmem_cache_free(buf_cache, ioctx->buf);744err_free_ioctx:745 kfree(ioctx);746err:747 return NULL;748}749 750/**751 * srpt_free_ioctx - free a SRPT I/O context structure752 * @sdev: SRPT HCA pointer.753 * @ioctx: I/O context pointer.754 * @buf_cache: I/O buffer cache.755 * @dir: DMA data direction.756 */757static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,758 struct kmem_cache *buf_cache,759 enum dma_data_direction dir)760{761 if (!ioctx)762 return;763 764 ib_dma_unmap_single(sdev->device, ioctx->dma,765 kmem_cache_size(buf_cache), dir);766 kmem_cache_free(buf_cache, ioctx->buf);767 kfree(ioctx);768}769 770/**771 * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures772 * @sdev: Device to allocate the I/O context ring for.773 * @ring_size: Number of elements in the I/O context ring.774 * @ioctx_size: I/O context size.775 * @buf_cache: I/O buffer cache.776 * @alignment_offset: Offset in each ring buffer at which the SRP information777 * unit starts.778 * @dir: DMA data direction.779 */780static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,781 int ring_size, int ioctx_size,782 struct kmem_cache *buf_cache,783 int alignment_offset,784 enum dma_data_direction dir)785{786 struct srpt_ioctx **ring;787 int i;788 789 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) &&790 ioctx_size != sizeof(struct srpt_send_ioctx));791 792 ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL);793 if (!ring)794 goto out;795 for (i = 0; i < ring_size; ++i) {796 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir);797 if (!ring[i])798 goto err;799 ring[i]->index = i;800 ring[i]->offset = alignment_offset;801 }802 goto out;803 804err:805 while (--i >= 0)806 srpt_free_ioctx(sdev, ring[i], buf_cache, dir);807 kvfree(ring);808 ring = NULL;809out:810 return ring;811}812 813/**814 * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures815 * @ioctx_ring: I/O context ring to be freed.816 * @sdev: SRPT HCA pointer.817 * @ring_size: Number of ring elements.818 * @buf_cache: I/O buffer cache.819 * @dir: DMA data direction.820 */821static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,822 struct srpt_device *sdev, int ring_size,823 struct kmem_cache *buf_cache,824 enum dma_data_direction dir)825{826 int i;827 828 if (!ioctx_ring)829 return;830 831 for (i = 0; i < ring_size; ++i)832 srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir);833 kvfree(ioctx_ring);834}835 836/**837 * srpt_set_cmd_state - set the state of a SCSI command838 * @ioctx: Send I/O context.839 * @new: New I/O context state.840 *841 * Does not modify the state of aborted commands. Returns the previous command842 * state.843 */844static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,845 enum srpt_command_state new)846{847 enum srpt_command_state previous;848 849 previous = ioctx->state;850 if (previous != SRPT_STATE_DONE)851 ioctx->state = new;852 853 return previous;854}855 856/**857 * srpt_test_and_set_cmd_state - test and set the state of a command858 * @ioctx: Send I/O context.859 * @old: Current I/O context state.860 * @new: New I/O context state.861 *862 * Returns true if and only if the previous command state was equal to 'old'.863 */864static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,865 enum srpt_command_state old,866 enum srpt_command_state new)867{868 enum srpt_command_state previous;869 870 WARN_ON(!ioctx);871 WARN_ON(old == SRPT_STATE_DONE);872 WARN_ON(new == SRPT_STATE_NEW);873 874 previous = ioctx->state;875 if (previous == old)876 ioctx->state = new;877 878 return previous == old;879}880 881/**882 * srpt_post_recv - post an IB receive request883 * @sdev: SRPT HCA pointer.884 * @ch: SRPT RDMA channel.885 * @ioctx: Receive I/O context pointer.886 */887static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,888 struct srpt_recv_ioctx *ioctx)889{890 struct ib_sge list;891 struct ib_recv_wr wr;892 893 BUG_ON(!sdev);894 list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset;895 list.length = srp_max_req_size;896 list.lkey = sdev->lkey;897 898 ioctx->ioctx.cqe.done = srpt_recv_done;899 wr.wr_cqe = &ioctx->ioctx.cqe;900 wr.next = NULL;901 wr.sg_list = &list;902 wr.num_sge = 1;903 904 if (sdev->use_srq)905 return ib_post_srq_recv(sdev->srq, &wr, NULL);906 else907 return ib_post_recv(ch->qp, &wr, NULL);908}909 910/**911 * srpt_zerolength_write - perform a zero-length RDMA write912 * @ch: SRPT RDMA channel.913 *914 * A quote from the InfiniBand specification: C9-88: For an HCA responder915 * using Reliable Connection service, for each zero-length RDMA READ or WRITE916 * request, the R_Key shall not be validated, even if the request includes917 * Immediate data.918 */919static int srpt_zerolength_write(struct srpt_rdma_ch *ch)920{921 struct ib_rdma_wr wr = {922 .wr = {923 .next = NULL,924 { .wr_cqe = &ch->zw_cqe, },925 .opcode = IB_WR_RDMA_WRITE,926 .send_flags = IB_SEND_SIGNALED,927 }928 };929 930 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,931 ch->qp->qp_num);932 933 return ib_post_send(ch->qp, &wr.wr, NULL);934}935 936static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)937{938 struct srpt_rdma_ch *ch = wc->qp->qp_context;939 940 pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num,941 wc->status);942 943 if (wc->status == IB_WC_SUCCESS) {944 srpt_process_wait_list(ch);945 } else {946 if (srpt_set_ch_state(ch, CH_DISCONNECTED))947 schedule_work(&ch->release_work);948 else949 pr_debug("%s-%d: already disconnected.\n",950 ch->sess_name, ch->qp->qp_num);951 }952}953 954static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,955 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,956 unsigned *sg_cnt)957{958 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);959 struct srpt_rdma_ch *ch = ioctx->ch;960 struct scatterlist *prev = NULL;961 unsigned prev_nents;962 int ret, i;963 964 if (nbufs == 1) {965 ioctx->rw_ctxs = &ioctx->s_rw_ctx;966 } else {967 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),968 GFP_KERNEL);969 if (!ioctx->rw_ctxs)970 return -ENOMEM;971 }972 973 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {974 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];975 u64 remote_addr = be64_to_cpu(db->va);976 u32 size = be32_to_cpu(db->len);977 u32 rkey = be32_to_cpu(db->key);978 979 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,980 i < nbufs - 1);981 if (ret)982 goto unwind;983 984 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,985 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);986 if (ret < 0) {987 target_free_sgl(ctx->sg, ctx->nents);988 goto unwind;989 }990 991 ioctx->n_rdma += ret;992 ioctx->n_rw_ctx++;993 994 if (prev) {995 sg_unmark_end(&prev[prev_nents - 1]);996 sg_chain(prev, prev_nents + 1, ctx->sg);997 } else {998 *sg = ctx->sg;999 }1000 1001 prev = ctx->sg;1002 prev_nents = ctx->nents;1003 1004 *sg_cnt += ctx->nents;1005 }1006 1007 return 0;1008 1009unwind:1010 while (--i >= 0) {1011 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];1012 1013 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,1014 ctx->sg, ctx->nents, dir);1015 target_free_sgl(ctx->sg, ctx->nents);1016 }1017 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)1018 kfree(ioctx->rw_ctxs);1019 return ret;1020}1021 1022static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,1023 struct srpt_send_ioctx *ioctx)1024{1025 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);1026 int i;1027 1028 for (i = 0; i < ioctx->n_rw_ctx; i++) {1029 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];1030 1031 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,1032 ctx->sg, ctx->nents, dir);1033 target_free_sgl(ctx->sg, ctx->nents);1034 }1035 1036 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)1037 kfree(ioctx->rw_ctxs);1038}1039 1040static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)1041{1042 /*1043 * The pointer computations below will only be compiled correctly1044 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check1045 * whether srp_cmd::add_data has been declared as a byte pointer.1046 */1047 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&1048 !__same_type(srp_cmd->add_data[0], (u8)0));1049 1050 /*1051 * According to the SRP spec, the lower two bits of the 'ADDITIONAL1052 * CDB LENGTH' field are reserved and the size in bytes of this field1053 * is four times the value specified in bits 3..7. Hence the "& ~3".1054 */1055 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);1056}1057 1058/**1059 * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request1060 * @recv_ioctx: I/O context associated with the received command @srp_cmd.1061 * @ioctx: I/O context that will be used for responding to the initiator.1062 * @srp_cmd: Pointer to the SRP_CMD request data.1063 * @dir: Pointer to the variable to which the transfer direction will be1064 * written.1065 * @sg: [out] scatterlist for the parsed SRP_CMD.1066 * @sg_cnt: [out] length of @sg.1067 * @data_len: Pointer to the variable to which the total data length of all1068 * descriptors in the SRP_CMD request will be written.1069 * @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data1070 * starts.1071 *1072 * This function initializes ioctx->nrbuf and ioctx->r_bufs.1073 *1074 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;1075 * -ENOMEM when memory allocation fails and zero upon success.1076 */1077static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx,1078 struct srpt_send_ioctx *ioctx,1079 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,1080 struct scatterlist **sg, unsigned int *sg_cnt, u64 *data_len,1081 u16 imm_data_offset)1082{1083 BUG_ON(!dir);1084 BUG_ON(!data_len);1085 1086 /*1087 * The lower four bits of the buffer format field contain the DATA-IN1088 * buffer descriptor format, and the highest four bits contain the1089 * DATA-OUT buffer descriptor format.1090 */1091 if (srp_cmd->buf_fmt & 0xf)1092 /* DATA-IN: transfer data from target to initiator (read). */1093 *dir = DMA_FROM_DEVICE;1094 else if (srp_cmd->buf_fmt >> 4)1095 /* DATA-OUT: transfer data from initiator to target (write). */1096 *dir = DMA_TO_DEVICE;1097 else1098 *dir = DMA_NONE;1099 1100 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */1101 ioctx->cmd.data_direction = *dir;1102 1103 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||1104 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {1105 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);1106 1107 *data_len = be32_to_cpu(db->len);1108 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);1109 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||1110 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {1111 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);1112 int nbufs = be32_to_cpu(idb->table_desc.len) /1113 sizeof(struct srp_direct_buf);1114 1115 if (nbufs >1116 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {1117 pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n",1118 srp_cmd->data_out_desc_cnt,1119 srp_cmd->data_in_desc_cnt,1120 be32_to_cpu(idb->table_desc.len),1121 sizeof(struct srp_direct_buf));1122 return -EINVAL;1123 }1124 1125 *data_len = be32_to_cpu(idb->len);1126 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,1127 sg, sg_cnt);1128 } else if ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_IMM) {1129 struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd);1130 void *data = (void *)srp_cmd + imm_data_offset;1131 uint32_t len = be32_to_cpu(imm_buf->len);1132 uint32_t req_size = imm_data_offset + len;1133 1134 if (req_size > srp_max_req_size) {1135 pr_err("Immediate data (length %d + %d) exceeds request size %d\n",1136 imm_data_offset, len, srp_max_req_size);1137 return -EINVAL;1138 }1139 if (recv_ioctx->byte_len < req_size) {1140 pr_err("Received too few data - %d < %d\n",1141 recv_ioctx->byte_len, req_size);1142 return -EIO;1143 }1144 /*1145 * The immediate data buffer descriptor must occur before the1146 * immediate data itself.1147 */1148 if ((void *)(imm_buf + 1) > (void *)data) {1149 pr_err("Received invalid write request\n");1150 return -EINVAL;1151 }1152 *data_len = len;1153 ioctx->recv_ioctx = recv_ioctx;1154 if ((uintptr_t)data & 511) {1155 pr_warn_once("Internal error - the receive buffers are not aligned properly.\n");1156 return -EINVAL;1157 }1158 sg_init_one(&ioctx->imm_sg, data, len);1159 *sg = &ioctx->imm_sg;1160 *sg_cnt = 1;1161 return 0;1162 } else {1163 *data_len = 0;1164 return 0;1165 }1166}1167 1168/**1169 * srpt_init_ch_qp - initialize queue pair attributes1170 * @ch: SRPT RDMA channel.1171 * @qp: Queue pair pointer.1172 *1173 * Initialized the attributes of queue pair 'qp' by allowing local write,1174 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.1175 */1176static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)1177{1178 struct ib_qp_attr *attr;1179 int ret;1180 1181 WARN_ON_ONCE(ch->using_rdma_cm);1182 1183 attr = kzalloc(sizeof(*attr), GFP_KERNEL);1184 if (!attr)1185 return -ENOMEM;1186 1187 attr->qp_state = IB_QPS_INIT;1188 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;1189 attr->port_num = ch->sport->port;1190 1191 ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port,1192 ch->pkey, &attr->pkey_index);1193 if (ret < 0)1194 pr_err("Translating pkey %#x failed (%d) - using index 0\n",1195 ch->pkey, ret);1196 1197 ret = ib_modify_qp(qp, attr,1198 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |1199 IB_QP_PKEY_INDEX);1200 1201 kfree(attr);1202 return ret;1203}1204 1205/**1206 * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR)1207 * @ch: channel of the queue pair.1208 * @qp: queue pair to change the state of.1209 *1210 * Returns zero upon success and a negative value upon failure.1211 *1212 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.1213 * If this structure ever becomes larger, it might be necessary to allocate1214 * it dynamically instead of on the stack.1215 */1216static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)1217{1218 struct ib_qp_attr qp_attr;1219 int attr_mask;1220 int ret;1221 1222 WARN_ON_ONCE(ch->using_rdma_cm);1223 1224 qp_attr.qp_state = IB_QPS_RTR;1225 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);1226 if (ret)1227 goto out;1228 1229 qp_attr.max_dest_rd_atomic = 4;1230 1231 ret = ib_modify_qp(qp, &qp_attr, attr_mask);1232 1233out:1234 return ret;1235}1236 1237/**1238 * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS)1239 * @ch: channel of the queue pair.1240 * @qp: queue pair to change the state of.1241 *1242 * Returns zero upon success and a negative value upon failure.1243 *1244 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.1245 * If this structure ever becomes larger, it might be necessary to allocate1246 * it dynamically instead of on the stack.1247 */1248static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)1249{1250 struct ib_qp_attr qp_attr;1251 int attr_mask;1252 int ret;1253 1254 qp_attr.qp_state = IB_QPS_RTS;1255 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);1256 if (ret)1257 goto out;1258 1259 qp_attr.max_rd_atomic = 4;1260 1261 ret = ib_modify_qp(qp, &qp_attr, attr_mask);1262 1263out:1264 return ret;1265}1266 1267/**1268 * srpt_ch_qp_err - set the channel queue pair state to 'error'1269 * @ch: SRPT RDMA channel.1270 */1271static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)1272{1273 struct ib_qp_attr qp_attr;1274 1275 qp_attr.qp_state = IB_QPS_ERR;1276 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);1277}1278 1279/**1280 * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator1281 * @ch: SRPT RDMA channel.1282 */1283static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)1284{1285 struct srpt_send_ioctx *ioctx;1286 int tag, cpu;1287 1288 BUG_ON(!ch);1289 1290 tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu);1291 if (tag < 0)1292 return NULL;1293 1294 ioctx = ch->ioctx_ring[tag];1295 BUG_ON(ioctx->ch != ch);1296 ioctx->state = SRPT_STATE_NEW;1297 WARN_ON_ONCE(ioctx->recv_ioctx);1298 ioctx->n_rdma = 0;1299 ioctx->n_rw_ctx = 0;1300 ioctx->queue_status_only = false;1301 /*1302 * transport_init_se_cmd() does not initialize all fields, so do it1303 * here.1304 */1305 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));1306 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));1307 ioctx->cmd.map_tag = tag;1308 ioctx->cmd.map_cpu = cpu;1309 1310 return ioctx;1311}1312 1313/**1314 * srpt_abort_cmd - abort a SCSI command1315 * @ioctx: I/O context associated with the SCSI command.1316 */1317static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)1318{1319 enum srpt_command_state state;1320 1321 BUG_ON(!ioctx);1322 1323 /*1324 * If the command is in a state where the target core is waiting for1325 * the ib_srpt driver, change the state to the next state.1326 */1327 1328 state = ioctx->state;1329 switch (state) {1330 case SRPT_STATE_NEED_DATA:1331 ioctx->state = SRPT_STATE_DATA_IN;1332 break;1333 case SRPT_STATE_CMD_RSP_SENT:1334 case SRPT_STATE_MGMT_RSP_SENT:1335 ioctx->state = SRPT_STATE_DONE;1336 break;1337 default:1338 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",1339 __func__, state);1340 break;1341 }1342 1343 pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,1344 ioctx->state, ioctx->cmd.tag);1345 1346 switch (state) {1347 case SRPT_STATE_NEW:1348 case SRPT_STATE_DATA_IN:1349 case SRPT_STATE_MGMT:1350 case SRPT_STATE_DONE:1351 /*1352 * Do nothing - defer abort processing until1353 * srpt_queue_response() is invoked.1354 */1355 break;1356 case SRPT_STATE_NEED_DATA:1357 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);1358 transport_generic_request_failure(&ioctx->cmd,1359 TCM_CHECK_CONDITION_ABORT_CMD);1360 break;1361 case SRPT_STATE_CMD_RSP_SENT:1362 /*1363 * SRP_RSP sending failed or the SRP_RSP send completion has1364 * not been received in time.1365 */1366 transport_generic_free_cmd(&ioctx->cmd, 0);1367 break;1368 case SRPT_STATE_MGMT_RSP_SENT:1369 transport_generic_free_cmd(&ioctx->cmd, 0);1370 break;1371 default:1372 WARN(1, "Unexpected command state (%d)", state);1373 break;1374 }1375 1376 return state;1377}1378 1379/**1380 * srpt_rdma_read_done - RDMA read completion callback1381 * @cq: Completion queue.1382 * @wc: Work completion.1383 *1384 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping1385 * the data that has been transferred via IB RDMA had to be postponed until the1386 * check_stop_free() callback. None of this is necessary anymore and needs to1387 * be cleaned up.1388 */1389static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)1390{1391 struct srpt_rdma_ch *ch = wc->qp->qp_context;1392 struct srpt_send_ioctx *ioctx =1393 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);1394 1395 WARN_ON(ioctx->n_rdma <= 0);1396 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);1397 ioctx->n_rdma = 0;1398 1399 if (unlikely(wc->status != IB_WC_SUCCESS)) {1400 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",1401 ioctx, wc->status);1402 srpt_abort_cmd(ioctx);1403 return;1404 }1405 1406 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,1407 SRPT_STATE_DATA_IN))1408 target_execute_cmd(&ioctx->cmd);1409 else1410 pr_err("%s[%d]: wrong state = %d\n", __func__,1411 __LINE__, ioctx->state);1412}1413 1414/**1415 * srpt_build_cmd_rsp - build a SRP_RSP response1416 * @ch: RDMA channel through which the request has been received.1417 * @ioctx: I/O context associated with the SRP_CMD request. The response will1418 * be built in the buffer ioctx->buf points at and hence this function will1419 * overwrite the request data.1420 * @tag: tag of the request for which this response is being generated.1421 * @status: value for the STATUS field of the SRP_RSP information unit.1422 *1423 * Returns the size in bytes of the SRP_RSP response.1424 *1425 * An SRP_RSP response contains a SCSI status or service response. See also1426 * section 6.9 in the SRP r16a document for the format of an SRP_RSP1427 * response. See also SPC-2 for more information about sense data.1428 */1429static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,1430 struct srpt_send_ioctx *ioctx, u64 tag,1431 int status)1432{1433 struct se_cmd *cmd = &ioctx->cmd;1434 struct srp_rsp *srp_rsp;1435 const u8 *sense_data;1436 int sense_data_len, max_sense_len;1437 u32 resid = cmd->residual_count;1438 1439 /*1440 * The lowest bit of all SAM-3 status codes is zero (see also1441 * paragraph 5.3 in SAM-3).1442 */1443 WARN_ON(status & 1);1444 1445 srp_rsp = ioctx->ioctx.buf;1446 BUG_ON(!srp_rsp);1447 1448 sense_data = ioctx->sense_data;1449 sense_data_len = ioctx->cmd.scsi_sense_length;1450 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));1451 1452 memset(srp_rsp, 0, sizeof(*srp_rsp));1453 srp_rsp->opcode = SRP_RSP;1454 srp_rsp->req_lim_delta =1455 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));1456 srp_rsp->tag = tag;1457 srp_rsp->status = status;1458 1459 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {1460 if (cmd->data_direction == DMA_TO_DEVICE) {1461 /* residual data from an underflow write */1462 srp_rsp->flags = SRP_RSP_FLAG_DOUNDER;1463 srp_rsp->data_out_res_cnt = cpu_to_be32(resid);1464 } else if (cmd->data_direction == DMA_FROM_DEVICE) {1465 /* residual data from an underflow read */1466 srp_rsp->flags = SRP_RSP_FLAG_DIUNDER;1467 srp_rsp->data_in_res_cnt = cpu_to_be32(resid);1468 }1469 } else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {1470 if (cmd->data_direction == DMA_TO_DEVICE) {1471 /* residual data from an overflow write */1472 srp_rsp->flags = SRP_RSP_FLAG_DOOVER;1473 srp_rsp->data_out_res_cnt = cpu_to_be32(resid);1474 } else if (cmd->data_direction == DMA_FROM_DEVICE) {1475 /* residual data from an overflow read */1476 srp_rsp->flags = SRP_RSP_FLAG_DIOVER;1477 srp_rsp->data_in_res_cnt = cpu_to_be32(resid);1478 }1479 }1480 1481 if (sense_data_len) {1482 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));1483 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);1484 if (sense_data_len > max_sense_len) {1485 pr_warn("truncated sense data from %d to %d bytes\n",1486 sense_data_len, max_sense_len);1487 sense_data_len = max_sense_len;1488 }1489 1490 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;1491 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);1492 memcpy(srp_rsp->data, sense_data, sense_data_len);1493 }1494 1495 return sizeof(*srp_rsp) + sense_data_len;1496}1497 1498/**1499 * srpt_build_tskmgmt_rsp - build a task management response1500 * @ch: RDMA channel through which the request has been received.1501 * @ioctx: I/O context in which the SRP_RSP response will be built.1502 * @rsp_code: RSP_CODE that will be stored in the response.1503 * @tag: Tag of the request for which this response is being generated.1504 *1505 * Returns the size in bytes of the SRP_RSP response.1506 *1507 * An SRP_RSP response contains a SCSI status or service response. See also1508 * section 6.9 in the SRP r16a document for the format of an SRP_RSP1509 * response.1510 */1511static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,1512 struct srpt_send_ioctx *ioctx,1513 u8 rsp_code, u64 tag)1514{1515 struct srp_rsp *srp_rsp;1516 int resp_data_len;1517 int resp_len;1518 1519 resp_data_len = 4;1520 resp_len = sizeof(*srp_rsp) + resp_data_len;1521 1522 srp_rsp = ioctx->ioctx.buf;1523 BUG_ON(!srp_rsp);1524 memset(srp_rsp, 0, sizeof(*srp_rsp));1525 1526 srp_rsp->opcode = SRP_RSP;1527 srp_rsp->req_lim_delta =1528 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));1529 srp_rsp->tag = tag;1530 1531 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;1532 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);1533 srp_rsp->data[3] = rsp_code;1534 1535 return resp_len;1536}1537 1538static int srpt_check_stop_free(struct se_cmd *cmd)1539{1540 struct srpt_send_ioctx *ioctx = container_of(cmd,1541 struct srpt_send_ioctx, cmd);1542 1543 return target_put_sess_cmd(&ioctx->cmd);1544}1545 1546/**1547 * srpt_handle_cmd - process a SRP_CMD information unit1548 * @ch: SRPT RDMA channel.1549 * @recv_ioctx: Receive I/O context.1550 * @send_ioctx: Send I/O context.1551 */1552static void srpt_handle_cmd(struct srpt_rdma_ch *ch,1553 struct srpt_recv_ioctx *recv_ioctx,1554 struct srpt_send_ioctx *send_ioctx)1555{1556 struct se_cmd *cmd;1557 struct srp_cmd *srp_cmd;1558 struct scatterlist *sg = NULL;1559 unsigned sg_cnt = 0;1560 u64 data_len;1561 enum dma_data_direction dir;1562 int rc;1563 1564 BUG_ON(!send_ioctx);1565 1566 srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;1567 cmd = &send_ioctx->cmd;1568 cmd->tag = srp_cmd->tag;1569 1570 switch (srp_cmd->task_attr) {1571 case SRP_CMD_SIMPLE_Q:1572 cmd->sam_task_attr = TCM_SIMPLE_TAG;1573 break;1574 case SRP_CMD_ORDERED_Q:1575 default:1576 cmd->sam_task_attr = TCM_ORDERED_TAG;1577 break;1578 case SRP_CMD_HEAD_OF_Q:1579 cmd->sam_task_attr = TCM_HEAD_TAG;1580 break;1581 case SRP_CMD_ACA:1582 cmd->sam_task_attr = TCM_ACA_TAG;1583 break;1584 }1585 1586 rc = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir,1587 &sg, &sg_cnt, &data_len, ch->imm_data_offset);1588 if (rc) {1589 if (rc != -EAGAIN) {1590 pr_err("0x%llx: parsing SRP descriptor table failed.\n",1591 srp_cmd->tag);1592 }1593 goto busy;1594 }1595 1596 rc = target_init_cmd(cmd, ch->sess, &send_ioctx->sense_data[0],1597 scsilun_to_int(&srp_cmd->lun), data_len,1598 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);1599 if (rc != 0) {1600 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,1601 srp_cmd->tag);1602 goto busy;1603 }1604 1605 if (target_submit_prep(cmd, srp_cmd->cdb, sg, sg_cnt, NULL, 0, NULL, 0,1606 GFP_KERNEL))1607 return;1608 1609 target_submit(cmd);1610 return;1611 1612busy:1613 target_send_busy(cmd);1614}1615 1616static int srp_tmr_to_tcm(int fn)1617{1618 switch (fn) {1619 case SRP_TSK_ABORT_TASK:1620 return TMR_ABORT_TASK;1621 case SRP_TSK_ABORT_TASK_SET:1622 return TMR_ABORT_TASK_SET;1623 case SRP_TSK_CLEAR_TASK_SET:1624 return TMR_CLEAR_TASK_SET;1625 case SRP_TSK_LUN_RESET:1626 return TMR_LUN_RESET;1627 case SRP_TSK_CLEAR_ACA:1628 return TMR_CLEAR_ACA;1629 default:1630 return -1;1631 }1632}1633 1634/**1635 * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit1636 * @ch: SRPT RDMA channel.1637 * @recv_ioctx: Receive I/O context.1638 * @send_ioctx: Send I/O context.1639 *1640 * Returns 0 if and only if the request will be processed by the target core.1641 *1642 * For more information about SRP_TSK_MGMT information units, see also section1643 * 6.7 in the SRP r16a document.1644 */1645static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,1646 struct srpt_recv_ioctx *recv_ioctx,1647 struct srpt_send_ioctx *send_ioctx)1648{1649 struct srp_tsk_mgmt *srp_tsk;1650 struct se_cmd *cmd;1651 struct se_session *sess = ch->sess;1652 int tcm_tmr;1653 int rc;1654 1655 BUG_ON(!send_ioctx);1656 1657 srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;1658 cmd = &send_ioctx->cmd;1659 1660 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",1661 srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch,1662 ch->sess);1663 1664 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);1665 send_ioctx->cmd.tag = srp_tsk->tag;1666 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);1667 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,1668 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,1669 GFP_KERNEL, srp_tsk->task_tag,1670 TARGET_SCF_ACK_KREF);1671 if (rc != 0) {1672 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;1673 cmd->se_tfo->queue_tm_rsp(cmd);1674 }1675 return;1676}1677 1678/**1679 * srpt_handle_new_iu - process a newly received information unit1680 * @ch: RDMA channel through which the information unit has been received.1681 * @recv_ioctx: Receive I/O context associated with the information unit.1682 */1683static bool1684srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx)1685{1686 struct srpt_send_ioctx *send_ioctx = NULL;1687 struct srp_cmd *srp_cmd;1688 bool res = false;1689 u8 opcode;1690 1691 BUG_ON(!ch);1692 BUG_ON(!recv_ioctx);1693 1694 if (unlikely(ch->state == CH_CONNECTING))1695 goto push;1696 1697 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,1698 recv_ioctx->ioctx.dma,1699 recv_ioctx->ioctx.offset + srp_max_req_size,1700 DMA_FROM_DEVICE);1701 1702 srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;1703 opcode = srp_cmd->opcode;1704 if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) {1705 send_ioctx = srpt_get_send_ioctx(ch);1706 if (unlikely(!send_ioctx))1707 goto push;1708 }1709 1710 if (!list_empty(&recv_ioctx->wait_list)) {1711 WARN_ON_ONCE(!ch->processing_wait_list);1712 list_del_init(&recv_ioctx->wait_list);1713 }1714 1715 switch (opcode) {1716 case SRP_CMD:1717 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);1718 break;1719 case SRP_TSK_MGMT:1720 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);1721 break;1722 case SRP_I_LOGOUT:1723 pr_err("Not yet implemented: SRP_I_LOGOUT\n");1724 break;1725 case SRP_CRED_RSP:1726 pr_debug("received SRP_CRED_RSP\n");1727 break;1728 case SRP_AER_RSP:1729 pr_debug("received SRP_AER_RSP\n");1730 break;1731 case SRP_RSP:1732 pr_err("Received SRP_RSP\n");1733 break;1734 default:1735 pr_err("received IU with unknown opcode 0x%x\n", opcode);1736 break;1737 }1738 1739 if (!send_ioctx || !send_ioctx->recv_ioctx)1740 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);1741 res = true;1742 1743out:1744 return res;1745 1746push:1747 if (list_empty(&recv_ioctx->wait_list)) {1748 WARN_ON_ONCE(ch->processing_wait_list);1749 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);1750 }1751 goto out;1752}1753 1754static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)1755{1756 struct srpt_rdma_ch *ch = wc->qp->qp_context;1757 struct srpt_recv_ioctx *ioctx =1758 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);1759 1760 if (wc->status == IB_WC_SUCCESS) {1761 int req_lim;1762 1763 req_lim = atomic_dec_return(&ch->req_lim);1764 if (unlikely(req_lim < 0))1765 pr_err("req_lim = %d < 0\n", req_lim);1766 ioctx->byte_len = wc->byte_len;1767 srpt_handle_new_iu(ch, ioctx);1768 } else {1769 pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",1770 ioctx, wc->status);1771 }1772}1773 1774/*1775 * This function must be called from the context in which RDMA completions are1776 * processed because it accesses the wait list without protection against1777 * access from other threads.1778 */1779static void srpt_process_wait_list(struct srpt_rdma_ch *ch)1780{1781 struct srpt_recv_ioctx *recv_ioctx, *tmp;1782 1783 WARN_ON_ONCE(ch->state == CH_CONNECTING);1784 1785 if (list_empty(&ch->cmd_wait_list))1786 return;1787 1788 WARN_ON_ONCE(ch->processing_wait_list);1789 ch->processing_wait_list = true;1790 list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,1791 wait_list) {1792 if (!srpt_handle_new_iu(ch, recv_ioctx))1793 break;1794 }1795 ch->processing_wait_list = false;1796}1797 1798/**1799 * srpt_send_done - send completion callback1800 * @cq: Completion queue.1801 * @wc: Work completion.1802 *1803 * Note: Although this has not yet been observed during tests, at least in1804 * theory it is possible that the srpt_get_send_ioctx() call invoked by1805 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta1806 * value in each response is set to one, and it is possible that this response1807 * makes the initiator send a new request before the send completion for that1808 * response has been processed. This could e.g. happen if the call to1809 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or1810 * if IB retransmission causes generation of the send completion to be1811 * delayed. Incoming information units for which srpt_get_send_ioctx() fails1812 * are queued on cmd_wait_list. The code below processes these delayed1813 * requests one at a time.1814 */1815static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)1816{1817 struct srpt_rdma_ch *ch = wc->qp->qp_context;1818 struct srpt_send_ioctx *ioctx =1819 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);1820 enum srpt_command_state state;1821 1822 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);1823 1824 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&1825 state != SRPT_STATE_MGMT_RSP_SENT);1826 1827 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);1828 1829 if (wc->status != IB_WC_SUCCESS)1830 pr_info("sending response for ioctx 0x%p failed with status %d\n",1831 ioctx, wc->status);1832 1833 if (state != SRPT_STATE_DONE) {1834 transport_generic_free_cmd(&ioctx->cmd, 0);1835 } else {1836 pr_err("IB completion has been received too late for wr_id = %u.\n",1837 ioctx->ioctx.index);1838 }1839 1840 srpt_process_wait_list(ch);1841}1842 1843/**1844 * srpt_create_ch_ib - create receive and send completion queues1845 * @ch: SRPT RDMA channel.1846 */1847static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)1848{1849 struct ib_qp_init_attr *qp_init;1850 struct srpt_port *sport = ch->sport;1851 struct srpt_device *sdev = sport->sdev;1852 const struct ib_device_attr *attrs = &sdev->device->attrs;1853 int sq_size = sport->port_attrib.srp_sq_size;1854 int i, ret;1855 1856 WARN_ON(ch->rq_size < 1);1857 1858 ret = -ENOMEM;1859 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);1860 if (!qp_init)1861 goto out;1862 1863retry:1864 ch->cq = ib_cq_pool_get(sdev->device, ch->rq_size + sq_size, -1,1865 IB_POLL_WORKQUEUE);1866 if (IS_ERR(ch->cq)) {1867 ret = PTR_ERR(ch->cq);1868 pr_err("failed to create CQ cqe= %d ret= %d\n",1869 ch->rq_size + sq_size, ret);1870 goto out;1871 }1872 ch->cq_size = ch->rq_size + sq_size;1873 1874 qp_init->qp_context = (void *)ch;1875 qp_init->event_handler = srpt_qp_event;1876 qp_init->send_cq = ch->cq;1877 qp_init->recv_cq = ch->cq;1878 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;1879 qp_init->qp_type = IB_QPT_RC;1880 /*1881 * We divide up our send queue size into half SEND WRs to send the1882 * completions, and half R/W contexts to actually do the RDMA1883 * READ/WRITE transfers. Note that we need to allocate CQ slots for1884 * both both, as RDMA contexts will also post completions for the1885 * RDMA READ case.1886 */1887 qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr);1888 qp_init->cap.max_rdma_ctxs = sq_size / 2;1889 qp_init->cap.max_send_sge = attrs->max_send_sge;1890 qp_init->cap.max_recv_sge = 1;1891 qp_init->port_num = ch->sport->port;1892 if (sdev->use_srq)1893 qp_init->srq = sdev->srq;1894 else1895 qp_init->cap.max_recv_wr = ch->rq_size;1896 1897 if (ch->using_rdma_cm) {1898 ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init);1899 ch->qp = ch->rdma_cm.cm_id->qp;1900 } else {1901 ch->qp = ib_create_qp(sdev->pd, qp_init);1902 if (!IS_ERR(ch->qp)) {1903 ret = srpt_init_ch_qp(ch, ch->qp);1904 if (ret)1905 ib_destroy_qp(ch->qp);1906 } else {1907 ret = PTR_ERR(ch->qp);1908 }1909 }1910 if (ret) {1911 bool retry = sq_size > MIN_SRPT_SQ_SIZE;1912 1913 if (retry) {1914 pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",1915 sq_size, ret);1916 ib_cq_pool_put(ch->cq, ch->cq_size);1917 sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE);1918 goto retry;1919 } else {1920 pr_err("failed to create queue pair with sq_size = %d (%d)\n",1921 sq_size, ret);1922 goto err_destroy_cq;1923 }1924 }1925 1926 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);1927 1928 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",1929 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,1930 qp_init->cap.max_send_wr, ch);1931 1932 if (!sdev->use_srq)1933 for (i = 0; i < ch->rq_size; i++)1934 srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);1935 1936out:1937 kfree(qp_init);1938 return ret;1939 1940err_destroy_cq:1941 ch->qp = NULL;1942 ib_cq_pool_put(ch->cq, ch->cq_size);1943 goto out;1944}1945 1946static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)1947{1948 ib_destroy_qp(ch->qp);1949 ib_cq_pool_put(ch->cq, ch->cq_size);1950}1951 1952/**1953 * srpt_close_ch - close a RDMA channel1954 * @ch: SRPT RDMA channel.1955 *1956 * Make sure all resources associated with the channel will be deallocated at1957 * an appropriate time.1958 *1959 * Returns true if and only if the channel state has been modified into1960 * CH_DRAINING.1961 */1962static bool srpt_close_ch(struct srpt_rdma_ch *ch)1963{1964 int ret;1965 1966 if (!srpt_set_ch_state(ch, CH_DRAINING)) {1967 pr_debug("%s: already closed\n", ch->sess_name);1968 return false;1969 }1970 1971 kref_get(&ch->kref);1972 1973 ret = srpt_ch_qp_err(ch);1974 if (ret < 0)1975 pr_err("%s-%d: changing queue pair into error state failed: %d\n",1976 ch->sess_name, ch->qp->qp_num, ret);1977 1978 ret = srpt_zerolength_write(ch);1979 if (ret < 0) {1980 pr_err("%s-%d: queuing zero-length write failed: %d\n",1981 ch->sess_name, ch->qp->qp_num, ret);1982 if (srpt_set_ch_state(ch, CH_DISCONNECTED))1983 schedule_work(&ch->release_work);1984 else1985 WARN_ON_ONCE(true);1986 }1987 1988 kref_put(&ch->kref, srpt_free_ch);1989 1990 return true;1991}1992 1993/*1994 * Change the channel state into CH_DISCONNECTING. If a channel has not yet1995 * reached the connected state, close it. If a channel is in the connected1996 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is1997 * the responsibility of the caller to ensure that this function is not1998 * invoked concurrently with the code that accepts a connection. This means1999 * that this function must either be invoked from inside a CM callback2000 * function or that it must be invoked with the srpt_port.mutex held.2001 */2002static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)2003{2004 int ret;2005 2006 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))2007 return -ENOTCONN;2008 2009 if (ch->using_rdma_cm) {2010 ret = rdma_disconnect(ch->rdma_cm.cm_id);2011 } else {2012 ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0);2013 if (ret < 0)2014 ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0);2015 }2016 2017 if (ret < 0 && srpt_close_ch(ch))2018 ret = 0;2019 2020 return ret;2021}2022 2023/* Send DREQ and wait for DREP. */2024static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)2025{2026 DECLARE_COMPLETION_ONSTACK(closed);2027 struct srpt_port *sport = ch->sport;2028 2029 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,2030 ch->state);2031 2032 ch->closed = &closed;2033 2034 mutex_lock(&sport->mutex);2035 srpt_disconnect_ch(ch);2036 mutex_unlock(&sport->mutex);2037 2038 while (wait_for_completion_timeout(&closed, 5 * HZ) == 0)2039 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,2040 ch->sess_name, ch->qp->qp_num, ch->state);2041 2042}2043 2044static void __srpt_close_all_ch(struct srpt_port *sport)2045{2046 struct srpt_nexus *nexus;2047 struct srpt_rdma_ch *ch;2048 2049 lockdep_assert_held(&sport->mutex);2050 2051 list_for_each_entry(nexus, &sport->nexus_list, entry) {2052 list_for_each_entry(ch, &nexus->ch_list, list) {2053 if (srpt_disconnect_ch(ch) >= 0)2054 pr_info("Closing channel %s-%d because target %s_%d has been disabled\n",2055 ch->sess_name, ch->qp->qp_num,2056 dev_name(&sport->sdev->device->dev),2057 sport->port);2058 srpt_close_ch(ch);2059 }2060 }2061}2062 2063/*2064 * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if2065 * it does not yet exist.2066 */2067static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,2068 const u8 i_port_id[16],2069 const u8 t_port_id[16])2070{2071 struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n;2072 2073 for (;;) {2074 mutex_lock(&sport->mutex);2075 list_for_each_entry(n, &sport->nexus_list, entry) {2076 if (memcmp(n->i_port_id, i_port_id, 16) == 0 &&2077 memcmp(n->t_port_id, t_port_id, 16) == 0) {2078 nexus = n;2079 break;2080 }2081 }2082 if (!nexus && tmp_nexus) {2083 list_add_tail_rcu(&tmp_nexus->entry,2084 &sport->nexus_list);2085 swap(nexus, tmp_nexus);2086 }2087 mutex_unlock(&sport->mutex);2088 2089 if (nexus)2090 break;2091 tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);2092 if (!tmp_nexus) {2093 nexus = ERR_PTR(-ENOMEM);2094 break;2095 }2096 INIT_LIST_HEAD(&tmp_nexus->ch_list);2097 memcpy(tmp_nexus->i_port_id, i_port_id, 16);2098 memcpy(tmp_nexus->t_port_id, t_port_id, 16);2099 }2100 2101 kfree(tmp_nexus);2102 2103 return nexus;2104}2105 2106static void srpt_set_enabled(struct srpt_port *sport, bool enabled)2107 __must_hold(&sport->mutex)2108{2109 lockdep_assert_held(&sport->mutex);2110 2111 if (sport->enabled == enabled)2112 return;2113 sport->enabled = enabled;2114 if (!enabled)2115 __srpt_close_all_ch(sport);2116}2117 2118static void srpt_drop_sport_ref(struct srpt_port *sport)2119{2120 if (atomic_dec_return(&sport->refcount) == 0 && sport->freed_channels)2121 complete(sport->freed_channels);2122}2123 2124static void srpt_free_ch(struct kref *kref)2125{2126 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);2127 2128 srpt_drop_sport_ref(ch->sport);2129 kfree_rcu(ch, rcu);2130}2131 2132/*2133 * Shut down the SCSI target session, tell the connection manager to2134 * disconnect the associated RDMA channel, transition the QP to the error2135 * state and remove the channel from the channel list. This function is2136 * typically called from inside srpt_zerolength_write_done(). Concurrent2137 * srpt_zerolength_write() calls from inside srpt_close_ch() are possible2138 * as long as the channel is on sport->nexus_list.2139 */2140static void srpt_release_channel_work(struct work_struct *w)2141{2142 struct srpt_rdma_ch *ch;2143 struct srpt_device *sdev;2144 struct srpt_port *sport;2145 struct se_session *se_sess;2146 2147 ch = container_of(w, struct srpt_rdma_ch, release_work);2148 pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num);2149 2150 sdev = ch->sport->sdev;2151 BUG_ON(!sdev);2152 2153 se_sess = ch->sess;2154 BUG_ON(!se_sess);2155 2156 target_stop_session(se_sess);2157 target_wait_for_sess_cmds(se_sess);2158 2159 target_remove_session(se_sess);2160 ch->sess = NULL;2161 2162 if (ch->using_rdma_cm)2163 rdma_destroy_id(ch->rdma_cm.cm_id);2164 else2165 ib_destroy_cm_id(ch->ib_cm.cm_id);2166 2167 sport = ch->sport;2168 mutex_lock(&sport->mutex);2169 list_del_rcu(&ch->list);2170 mutex_unlock(&sport->mutex);2171 2172 if (ch->closed)2173 complete(ch->closed);2174 2175 srpt_destroy_ch_ib(ch);2176 2177 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,2178 ch->sport->sdev, ch->rq_size,2179 ch->rsp_buf_cache, DMA_TO_DEVICE);2180 2181 srpt_cache_put(ch->rsp_buf_cache);2182 2183 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,2184 sdev, ch->rq_size,2185 ch->req_buf_cache, DMA_FROM_DEVICE);2186 2187 srpt_cache_put(ch->req_buf_cache);2188 2189 kref_put(&ch->kref, srpt_free_ch);2190}2191 2192/**2193 * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED2194 * @sdev: HCA through which the login request was received.2195 * @ib_cm_id: IB/CM connection identifier in case of IB/CM.2196 * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM.2197 * @port_num: Port through which the REQ message was received.2198 * @pkey: P_Key of the incoming connection.2199 * @req: SRP login request.2200 * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted2201 * the login request.2202 *2203 * Ownership of the cm_id is transferred to the target session if this2204 * function returns zero. Otherwise the caller remains the owner of cm_id.2205 */2206static int srpt_cm_req_recv(struct srpt_device *const sdev,2207 struct ib_cm_id *ib_cm_id,2208 struct rdma_cm_id *rdma_cm_id,2209 u8 port_num, __be16 pkey,2210 const struct srp_login_req *req,2211 const char *src_addr)2212{2213 struct srpt_port *sport = &sdev->port[port_num - 1];2214 struct srpt_nexus *nexus;2215 struct srp_login_rsp *rsp = NULL;2216 struct srp_login_rej *rej = NULL;2217 union {2218 struct rdma_conn_param rdma_cm;2219 struct ib_cm_rep_param ib_cm;2220 } *rep_param = NULL;2221 struct srpt_rdma_ch *ch = NULL;2222 char i_port_id[36];2223 u32 it_iu_len;2224 int i, tag_num, tag_size, ret;2225 struct srpt_tpg *stpg;2226 2227 WARN_ON_ONCE(irqs_disabled());2228 2229 it_iu_len = be32_to_cpu(req->req_it_iu_len);2230 2231 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",2232 req->initiator_port_id, req->target_port_id, it_iu_len,2233 port_num, &sport->gid, be16_to_cpu(pkey));2234 2235 nexus = srpt_get_nexus(sport, req->initiator_port_id,2236 req->target_port_id);2237 if (IS_ERR(nexus)) {2238 ret = PTR_ERR(nexus);2239 goto out;2240 }2241 2242 ret = -ENOMEM;2243 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);2244 rej = kzalloc(sizeof(*rej), GFP_KERNEL);2245 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);2246 if (!rsp || !rej || !rep_param)2247 goto out;2248 2249 ret = -EINVAL;2250 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {2251 rej->reason = cpu_to_be32(2252 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);2253 pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",2254 it_iu_len, 64, srp_max_req_size);2255 goto reject;2256 }2257 2258 if (!sport->enabled) {2259 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2260 pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",2261 dev_name(&sport->sdev->device->dev), port_num);2262 goto reject;2263 }2264 2265 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)2266 || *(__be64 *)(req->target_port_id + 8) !=2267 cpu_to_be64(srpt_service_guid)) {2268 rej->reason = cpu_to_be32(2269 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);2270 pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");2271 goto reject;2272 }2273 2274 ret = -ENOMEM;2275 ch = kzalloc(sizeof(*ch), GFP_KERNEL);2276 if (!ch) {2277 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2278 pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");2279 goto reject;2280 }2281 2282 kref_init(&ch->kref);2283 ch->pkey = be16_to_cpu(pkey);2284 ch->nexus = nexus;2285 ch->zw_cqe.done = srpt_zerolength_write_done;2286 INIT_WORK(&ch->release_work, srpt_release_channel_work);2287 ch->sport = sport;2288 if (rdma_cm_id) {2289 ch->using_rdma_cm = true;2290 ch->rdma_cm.cm_id = rdma_cm_id;2291 rdma_cm_id->context = ch;2292 } else {2293 ch->ib_cm.cm_id = ib_cm_id;2294 ib_cm_id->context = ch;2295 }2296 /*2297 * ch->rq_size should be at least as large as the initiator queue2298 * depth to avoid that the initiator driver has to report QUEUE_FULL2299 * to the SCSI mid-layer.2300 */2301 ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);2302 spin_lock_init(&ch->spinlock);2303 ch->state = CH_CONNECTING;2304 INIT_LIST_HEAD(&ch->cmd_wait_list);2305 ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size;2306 2307 ch->rsp_buf_cache = srpt_cache_get(ch->max_rsp_size);2308 if (!ch->rsp_buf_cache)2309 goto free_ch;2310 2311 ch->ioctx_ring = (struct srpt_send_ioctx **)2312 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,2313 sizeof(*ch->ioctx_ring[0]),2314 ch->rsp_buf_cache, 0, DMA_TO_DEVICE);2315 if (!ch->ioctx_ring) {2316 pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");2317 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2318 goto free_rsp_cache;2319 }2320 2321 for (i = 0; i < ch->rq_size; i++)2322 ch->ioctx_ring[i]->ch = ch;2323 if (!sdev->use_srq) {2324 u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ?2325 be16_to_cpu(req->imm_data_offset) : 0;2326 u16 alignment_offset;2327 u32 req_sz;2328 2329 if (req->req_flags & SRP_IMMED_REQUESTED)2330 pr_debug("imm_data_offset = %d\n",2331 be16_to_cpu(req->imm_data_offset));2332 if (imm_data_offset >= sizeof(struct srp_cmd)) {2333 ch->imm_data_offset = imm_data_offset;2334 rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP;2335 } else {2336 ch->imm_data_offset = 0;2337 }2338 alignment_offset = round_up(imm_data_offset, 512) -2339 imm_data_offset;2340 req_sz = alignment_offset + imm_data_offset + srp_max_req_size;2341 ch->req_buf_cache = srpt_cache_get(req_sz);2342 if (!ch->req_buf_cache)2343 goto free_rsp_ring;2344 2345 ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)2346 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,2347 sizeof(*ch->ioctx_recv_ring[0]),2348 ch->req_buf_cache,2349 alignment_offset,2350 DMA_FROM_DEVICE);2351 if (!ch->ioctx_recv_ring) {2352 pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");2353 rej->reason =2354 cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2355 goto free_recv_cache;2356 }2357 for (i = 0; i < ch->rq_size; i++)2358 INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list);2359 }2360 2361 ret = srpt_create_ch_ib(ch);2362 if (ret) {2363 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2364 pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");2365 goto free_recv_ring;2366 }2367 2368 strscpy(ch->sess_name, src_addr, sizeof(ch->sess_name));2369 snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx",2370 be64_to_cpu(*(__be64 *)nexus->i_port_id),2371 be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8)));2372 2373 pr_debug("registering src addr %s or i_port_id %s\n", ch->sess_name,2374 i_port_id);2375 2376 tag_num = ch->rq_size;2377 tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */2378 2379 if (sport->guid_id) {2380 mutex_lock(&sport->guid_id->mutex);2381 list_for_each_entry(stpg, &sport->guid_id->tpg_list, entry) {2382 if (!IS_ERR_OR_NULL(ch->sess))2383 break;2384 ch->sess = target_setup_session(&stpg->tpg, tag_num,2385 tag_size, TARGET_PROT_NORMAL,2386 ch->sess_name, ch, NULL);2387 }2388 mutex_unlock(&sport->guid_id->mutex);2389 }2390 2391 if (sport->gid_id) {2392 mutex_lock(&sport->gid_id->mutex);2393 list_for_each_entry(stpg, &sport->gid_id->tpg_list, entry) {2394 if (!IS_ERR_OR_NULL(ch->sess))2395 break;2396 ch->sess = target_setup_session(&stpg->tpg, tag_num,2397 tag_size, TARGET_PROT_NORMAL, i_port_id,2398 ch, NULL);2399 if (!IS_ERR_OR_NULL(ch->sess))2400 break;2401 /* Retry without leading "0x" */2402 ch->sess = target_setup_session(&stpg->tpg, tag_num,2403 tag_size, TARGET_PROT_NORMAL,2404 i_port_id + 2, ch, NULL);2405 }2406 mutex_unlock(&sport->gid_id->mutex);2407 }2408 2409 if (IS_ERR_OR_NULL(ch->sess)) {2410 WARN_ON_ONCE(ch->sess == NULL);2411 ret = PTR_ERR(ch->sess);2412 ch->sess = NULL;2413 pr_info("Rejected login for initiator %s: ret = %d.\n",2414 ch->sess_name, ret);2415 rej->reason = cpu_to_be32(ret == -ENOMEM ?2416 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :2417 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);2418 goto destroy_ib;2419 }2420 2421 /*2422 * Once a session has been created destruction of srpt_rdma_ch objects2423 * will decrement sport->refcount. Hence increment sport->refcount now.2424 */2425 atomic_inc(&sport->refcount);2426 2427 mutex_lock(&sport->mutex);2428 2429 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {2430 struct srpt_rdma_ch *ch2;2431 2432 list_for_each_entry(ch2, &nexus->ch_list, list) {2433 if (srpt_disconnect_ch(ch2) < 0)2434 continue;2435 pr_info("Relogin - closed existing channel %s\n",2436 ch2->sess_name);2437 rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED;2438 }2439 } else {2440 rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;2441 }2442 2443 list_add_tail_rcu(&ch->list, &nexus->ch_list);2444 2445 if (!sport->enabled) {2446 rej->reason = cpu_to_be32(2447 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2448 pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",2449 dev_name(&sdev->device->dev), port_num);2450 mutex_unlock(&sport->mutex);2451 ret = -EINVAL;2452 goto reject;2453 }2454 2455 mutex_unlock(&sport->mutex);2456 2457 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp);2458 if (ret) {2459 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2460 pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",2461 ret);2462 goto reject;2463 }2464 2465 pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess,2466 ch->sess_name, ch);2467 2468 /* create srp_login_response */2469 rsp->opcode = SRP_LOGIN_RSP;2470 rsp->tag = req->tag;2471 rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size);2472 rsp->max_ti_iu_len = req->req_it_iu_len;2473 ch->max_ti_iu_len = it_iu_len;2474 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |2475 SRP_BUF_FORMAT_INDIRECT);2476 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);2477 atomic_set(&ch->req_lim, ch->rq_size);2478 atomic_set(&ch->req_lim_delta, 0);2479 2480 /* create cm reply */2481 if (ch->using_rdma_cm) {2482 rep_param->rdma_cm.private_data = (void *)rsp;2483 rep_param->rdma_cm.private_data_len = sizeof(*rsp);2484 rep_param->rdma_cm.rnr_retry_count = 7;2485 rep_param->rdma_cm.flow_control = 1;2486 rep_param->rdma_cm.responder_resources = 4;2487 rep_param->rdma_cm.initiator_depth = 4;2488 } else {2489 rep_param->ib_cm.qp_num = ch->qp->qp_num;2490 rep_param->ib_cm.private_data = (void *)rsp;2491 rep_param->ib_cm.private_data_len = sizeof(*rsp);2492 rep_param->ib_cm.rnr_retry_count = 7;2493 rep_param->ib_cm.flow_control = 1;2494 rep_param->ib_cm.failover_accepted = 0;2495 rep_param->ib_cm.srq = 1;2496 rep_param->ib_cm.responder_resources = 4;2497 rep_param->ib_cm.initiator_depth = 4;2498 }2499 2500 /*2501 * Hold the sport mutex while accepting a connection to avoid that2502 * srpt_disconnect_ch() is invoked concurrently with this code.2503 */2504 mutex_lock(&sport->mutex);2505 if (sport->enabled && ch->state == CH_CONNECTING) {2506 if (ch->using_rdma_cm)2507 ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm);2508 else2509 ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm);2510 } else {2511 ret = -EINVAL;2512 }2513 mutex_unlock(&sport->mutex);2514 2515 switch (ret) {2516 case 0:2517 break;2518 case -EINVAL:2519 goto reject;2520 default:2521 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);2522 pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",2523 ret);2524 goto reject;2525 }2526 2527 goto out;2528 2529destroy_ib:2530 srpt_destroy_ch_ib(ch);2531 2532free_recv_ring:2533 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,2534 ch->sport->sdev, ch->rq_size,2535 ch->req_buf_cache, DMA_FROM_DEVICE);2536 2537free_recv_cache:2538 srpt_cache_put(ch->req_buf_cache);2539 2540free_rsp_ring:2541 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,2542 ch->sport->sdev, ch->rq_size,2543 ch->rsp_buf_cache, DMA_TO_DEVICE);2544 2545free_rsp_cache:2546 srpt_cache_put(ch->rsp_buf_cache);2547 2548free_ch:2549 if (rdma_cm_id)2550 rdma_cm_id->context = NULL;2551 else2552 ib_cm_id->context = NULL;2553 kfree(ch);2554 ch = NULL;2555 2556 WARN_ON_ONCE(ret == 0);2557 2558reject:2559 pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason));2560 rej->opcode = SRP_LOGIN_REJ;2561 rej->tag = req->tag;2562 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |2563 SRP_BUF_FORMAT_INDIRECT);2564 2565 if (rdma_cm_id)2566 rdma_reject(rdma_cm_id, rej, sizeof(*rej),2567 IB_CM_REJ_CONSUMER_DEFINED);2568 else2569 ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,2570 rej, sizeof(*rej));2571 2572 if (ch && ch->sess) {2573 srpt_close_ch(ch);2574 /*2575 * Tell the caller not to free cm_id since2576 * srpt_release_channel_work() will do that.2577 */2578 ret = 0;2579 }2580 2581out:2582 kfree(rep_param);2583 kfree(rsp);2584 kfree(rej);2585 2586 return ret;2587}2588 2589static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,2590 const struct ib_cm_req_event_param *param,2591 void *private_data)2592{2593 char sguid[40];2594 2595 srpt_format_guid(sguid, sizeof(sguid),2596 ¶m->primary_path->dgid.global.interface_id);2597 2598 return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port,2599 param->primary_path->pkey,2600 private_data, sguid);2601}2602 2603static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id,2604 struct rdma_cm_event *event)2605{2606 struct srpt_device *sdev;2607 struct srp_login_req req;2608 const struct srp_login_req_rdma *req_rdma;2609 struct sa_path_rec *path_rec = cm_id->route.path_rec;2610 char src_addr[40];2611 2612 sdev = ib_get_client_data(cm_id->device, &srpt_client);2613 if (!sdev)2614 return -ECONNREFUSED;2615 2616 if (event->param.conn.private_data_len < sizeof(*req_rdma))2617 return -EINVAL;2618 2619 /* Transform srp_login_req_rdma into srp_login_req. */2620 req_rdma = event->param.conn.private_data;2621 memset(&req, 0, sizeof(req));2622 req.opcode = req_rdma->opcode;2623 req.tag = req_rdma->tag;2624 req.req_it_iu_len = req_rdma->req_it_iu_len;2625 req.req_buf_fmt = req_rdma->req_buf_fmt;2626 req.req_flags = req_rdma->req_flags;2627 memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16);2628 memcpy(req.target_port_id, req_rdma->target_port_id, 16);2629 req.imm_data_offset = req_rdma->imm_data_offset;2630 2631 snprintf(src_addr, sizeof(src_addr), "%pIS",2632 &cm_id->route.addr.src_addr);2633 2634 return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num,2635 path_rec ? path_rec->pkey : 0, &req, src_addr);2636}2637 2638static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,2639 enum ib_cm_rej_reason reason,2640 const u8 *private_data,2641 u8 private_data_len)2642{2643 char *priv = NULL;2644 int i;2645 2646 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,2647 GFP_KERNEL))) {2648 for (i = 0; i < private_data_len; i++)2649 sprintf(priv + 3 * i, " %02x", private_data[i]);2650 }2651 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",2652 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?2653 "; private data" : "", priv ? priv : " (?)");2654 kfree(priv);2655}2656 2657/**2658 * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event2659 * @ch: SRPT RDMA channel.2660 *2661 * An RTU (ready to use) message indicates that the connection has been2662 * established and that the recipient may begin transmitting.2663 */2664static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)2665{2666 int ret;2667 2668 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp);2669 if (ret < 0) {2670 pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name,2671 ch->qp->qp_num);2672 srpt_close_ch(ch);2673 return;2674 }2675 2676 /*2677 * Note: calling srpt_close_ch() if the transition to the LIVE state2678 * fails is not necessary since that means that that function has2679 * already been invoked from another thread.2680 */2681 if (!srpt_set_ch_state(ch, CH_LIVE)) {2682 pr_err("%s-%d: channel transition to LIVE state failed\n",2683 ch->sess_name, ch->qp->qp_num);2684 return;2685 }2686 2687 /* Trigger wait list processing. */2688 ret = srpt_zerolength_write(ch);2689 WARN_ONCE(ret < 0, "%d\n", ret);2690}2691 2692/**2693 * srpt_cm_handler - IB connection manager callback function2694 * @cm_id: IB/CM connection identifier.2695 * @event: IB/CM event.2696 *2697 * A non-zero return value will cause the caller destroy the CM ID.2698 *2699 * Note: srpt_cm_handler() must only return a non-zero value when transferring2700 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning2701 * a non-zero value in any other case will trigger a race with the2702 * ib_destroy_cm_id() call in srpt_release_channel().2703 */2704static int srpt_cm_handler(struct ib_cm_id *cm_id,2705 const struct ib_cm_event *event)2706{2707 struct srpt_rdma_ch *ch = cm_id->context;2708 int ret;2709 2710 ret = 0;2711 switch (event->event) {2712 case IB_CM_REQ_RECEIVED:2713 ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd,2714 event->private_data);2715 break;2716 case IB_CM_REJ_RECEIVED:2717 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,2718 event->private_data,2719 IB_CM_REJ_PRIVATE_DATA_SIZE);2720 break;2721 case IB_CM_RTU_RECEIVED:2722 case IB_CM_USER_ESTABLISHED:2723 srpt_cm_rtu_recv(ch);2724 break;2725 case IB_CM_DREQ_RECEIVED:2726 srpt_disconnect_ch(ch);2727 break;2728 case IB_CM_DREP_RECEIVED:2729 pr_info("Received CM DREP message for ch %s-%d.\n",2730 ch->sess_name, ch->qp->qp_num);2731 srpt_close_ch(ch);2732 break;2733 case IB_CM_TIMEWAIT_EXIT:2734 pr_info("Received CM TimeWait exit for ch %s-%d.\n",2735 ch->sess_name, ch->qp->qp_num);2736 srpt_close_ch(ch);2737 break;2738 case IB_CM_REP_ERROR:2739 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,2740 ch->qp->qp_num);2741 break;2742 case IB_CM_DREQ_ERROR:2743 pr_info("Received CM DREQ ERROR event.\n");2744 break;2745 case IB_CM_MRA_RECEIVED:2746 pr_info("Received CM MRA event\n");2747 break;2748 default:2749 pr_err("received unrecognized CM event %d\n", event->event);2750 break;2751 }2752 2753 return ret;2754}2755 2756static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id,2757 struct rdma_cm_event *event)2758{2759 struct srpt_rdma_ch *ch = cm_id->context;2760 int ret = 0;2761 2762 switch (event->event) {2763 case RDMA_CM_EVENT_CONNECT_REQUEST:2764 ret = srpt_rdma_cm_req_recv(cm_id, event);2765 break;2766 case RDMA_CM_EVENT_REJECTED:2767 srpt_cm_rej_recv(ch, event->status,2768 event->param.conn.private_data,2769 event->param.conn.private_data_len);2770 break;2771 case RDMA_CM_EVENT_ESTABLISHED:2772 srpt_cm_rtu_recv(ch);2773 break;2774 case RDMA_CM_EVENT_DISCONNECTED:2775 if (ch->state < CH_DISCONNECTING)2776 srpt_disconnect_ch(ch);2777 else2778 srpt_close_ch(ch);2779 break;2780 case RDMA_CM_EVENT_TIMEWAIT_EXIT:2781 srpt_close_ch(ch);2782 break;2783 case RDMA_CM_EVENT_UNREACHABLE:2784 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,2785 ch->qp->qp_num);2786 break;2787 case RDMA_CM_EVENT_DEVICE_REMOVAL:2788 case RDMA_CM_EVENT_ADDR_CHANGE:2789 break;2790 default:2791 pr_err("received unrecognized RDMA CM event %d\n",2792 event->event);2793 break;2794 }2795 2796 return ret;2797}2798 2799/*2800 * srpt_write_pending - Start data transfer from initiator to target (write).2801 */2802static int srpt_write_pending(struct se_cmd *se_cmd)2803{2804 struct srpt_send_ioctx *ioctx =2805 container_of(se_cmd, struct srpt_send_ioctx, cmd);2806 struct srpt_rdma_ch *ch = ioctx->ch;2807 struct ib_send_wr *first_wr = NULL;2808 struct ib_cqe *cqe = &ioctx->rdma_cqe;2809 enum srpt_command_state new_state;2810 int ret, i;2811 2812 if (ioctx->recv_ioctx) {2813 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);2814 target_execute_cmd(&ioctx->cmd);2815 return 0;2816 }2817 2818 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);2819 WARN_ON(new_state == SRPT_STATE_DONE);2820 2821 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {2822 pr_warn("%s: IB send queue full (needed %d)\n",2823 __func__, ioctx->n_rdma);2824 ret = -ENOMEM;2825 goto out_undo;2826 }2827 2828 cqe->done = srpt_rdma_read_done;2829 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {2830 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];2831 2832 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,2833 cqe, first_wr);2834 cqe = NULL;2835 }2836 2837 ret = ib_post_send(ch->qp, first_wr, NULL);2838 if (ret) {2839 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",2840 __func__, ret, ioctx->n_rdma,2841 atomic_read(&ch->sq_wr_avail));2842 goto out_undo;2843 }2844 2845 return 0;2846out_undo:2847 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);2848 return ret;2849}2850 2851static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)2852{2853 switch (tcm_mgmt_status) {2854 case TMR_FUNCTION_COMPLETE:2855 return SRP_TSK_MGMT_SUCCESS;2856 case TMR_FUNCTION_REJECTED:2857 return SRP_TSK_MGMT_FUNC_NOT_SUPP;2858 }2859 return SRP_TSK_MGMT_FAILED;2860}2861 2862/**2863 * srpt_queue_response - transmit the response to a SCSI command2864 * @cmd: SCSI target command.2865 *2866 * Callback function called by the TCM core. Must not block since it can be2867 * invoked on the context of the IB completion handler.2868 */2869static void srpt_queue_response(struct se_cmd *cmd)2870{2871 struct srpt_send_ioctx *ioctx =2872 container_of(cmd, struct srpt_send_ioctx, cmd);2873 struct srpt_rdma_ch *ch = ioctx->ch;2874 struct srpt_device *sdev = ch->sport->sdev;2875 struct ib_send_wr send_wr, *first_wr = &send_wr;2876 struct ib_sge sge;2877 enum srpt_command_state state;2878 int resp_len, ret, i;2879 u8 srp_tm_status;2880 2881 state = ioctx->state;2882 switch (state) {2883 case SRPT_STATE_NEW:2884 case SRPT_STATE_DATA_IN:2885 ioctx->state = SRPT_STATE_CMD_RSP_SENT;2886 break;2887 case SRPT_STATE_MGMT:2888 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;2889 break;2890 default:2891 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",2892 ch, ioctx->ioctx.index, ioctx->state);2893 break;2894 }2895 2896 if (WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))2897 return;2898 2899 /* For read commands, transfer the data to the initiator. */2900 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&2901 ioctx->cmd.data_length &&2902 !ioctx->queue_status_only) {2903 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {2904 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];2905 2906 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,2907 ch->sport->port, NULL, first_wr);2908 }2909 }2910 2911 if (state != SRPT_STATE_MGMT)2912 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,2913 cmd->scsi_status);2914 else {2915 srp_tm_status2916 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);2917 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,2918 ioctx->cmd.tag);2919 }2920 2921 atomic_inc(&ch->req_lim);2922 2923 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,2924 &ch->sq_wr_avail) < 0)) {2925 pr_warn("%s: IB send queue full (needed %d)\n",2926 __func__, ioctx->n_rdma);2927 goto out;2928 }2929 2930 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,2931 DMA_TO_DEVICE);2932 2933 sge.addr = ioctx->ioctx.dma;2934 sge.length = resp_len;2935 sge.lkey = sdev->lkey;2936 2937 ioctx->ioctx.cqe.done = srpt_send_done;2938 send_wr.next = NULL;2939 send_wr.wr_cqe = &ioctx->ioctx.cqe;2940 send_wr.sg_list = &sge;2941 send_wr.num_sge = 1;2942 send_wr.opcode = IB_WR_SEND;2943 send_wr.send_flags = IB_SEND_SIGNALED;2944 2945 ret = ib_post_send(ch->qp, first_wr, NULL);2946 if (ret < 0) {2947 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",2948 __func__, ioctx->cmd.tag, ret);2949 goto out;2950 }2951 2952 return;2953 2954out:2955 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);2956 atomic_dec(&ch->req_lim);2957 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);2958 target_put_sess_cmd(&ioctx->cmd);2959}2960 2961static int srpt_queue_data_in(struct se_cmd *cmd)2962{2963 srpt_queue_response(cmd);2964 return 0;2965}2966 2967static void srpt_queue_tm_rsp(struct se_cmd *cmd)2968{2969 srpt_queue_response(cmd);2970}2971 2972/*2973 * This function is called for aborted commands if no response is sent to the2974 * initiator. Make sure that the credits freed by aborting a command are2975 * returned to the initiator the next time a response is sent by incrementing2976 * ch->req_lim_delta.2977 */2978static void srpt_aborted_task(struct se_cmd *cmd)2979{2980 struct srpt_send_ioctx *ioctx = container_of(cmd,2981 struct srpt_send_ioctx, cmd);2982 struct srpt_rdma_ch *ch = ioctx->ch;2983 2984 atomic_inc(&ch->req_lim_delta);2985}2986 2987static int srpt_queue_status(struct se_cmd *cmd)2988{2989 struct srpt_send_ioctx *ioctx;2990 2991 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);2992 BUG_ON(ioctx->sense_data != cmd->sense_buffer);2993 if (cmd->se_cmd_flags &2994 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))2995 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);2996 ioctx->queue_status_only = true;2997 srpt_queue_response(cmd);2998 return 0;2999}3000 3001static void srpt_refresh_port_work(struct work_struct *work)3002{3003 struct srpt_port *sport = container_of(work, struct srpt_port, work);3004 3005 srpt_refresh_port(sport);3006}3007 3008/**3009 * srpt_release_sport - disable login and wait for associated channels3010 * @sport: SRPT HCA port.3011 */3012static int srpt_release_sport(struct srpt_port *sport)3013{3014 DECLARE_COMPLETION_ONSTACK(c);3015 struct srpt_nexus *nexus, *next_n;3016 struct srpt_rdma_ch *ch;3017 3018 WARN_ON_ONCE(irqs_disabled());3019 3020 sport->freed_channels = &c;3021 3022 mutex_lock(&sport->mutex);3023 srpt_set_enabled(sport, false);3024 mutex_unlock(&sport->mutex);3025 3026 while (atomic_read(&sport->refcount) > 0 &&3027 wait_for_completion_timeout(&c, 5 * HZ) <= 0) {3028 pr_info("%s_%d: waiting for unregistration of %d sessions ...\n",3029 dev_name(&sport->sdev->device->dev), sport->port,3030 atomic_read(&sport->refcount));3031 rcu_read_lock();3032 list_for_each_entry(nexus, &sport->nexus_list, entry) {3033 list_for_each_entry(ch, &nexus->ch_list, list) {3034 pr_info("%s-%d: state %s\n",3035 ch->sess_name, ch->qp->qp_num,3036 get_ch_state_name(ch->state));3037 }3038 }3039 rcu_read_unlock();3040 }3041 3042 mutex_lock(&sport->mutex);3043 list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) {3044 list_del(&nexus->entry);3045 kfree_rcu(nexus, rcu);3046 }3047 mutex_unlock(&sport->mutex);3048 3049 return 0;3050}3051 3052struct port_and_port_id {3053 struct srpt_port *sport;3054 struct srpt_port_id **port_id;3055};3056 3057static struct port_and_port_id __srpt_lookup_port(const char *name)3058{3059 struct ib_device *dev;3060 struct srpt_device *sdev;3061 struct srpt_port *sport;3062 int i;3063 3064 list_for_each_entry(sdev, &srpt_dev_list, list) {3065 dev = sdev->device;3066 if (!dev)3067 continue;3068 3069 for (i = 0; i < dev->phys_port_cnt; i++) {3070 sport = &sdev->port[i];3071 3072 if (strcmp(sport->guid_name, name) == 0) {3073 kref_get(&sdev->refcnt);3074 return (struct port_and_port_id){3075 sport, &sport->guid_id};3076 }3077 if (strcmp(sport->gid_name, name) == 0) {3078 kref_get(&sdev->refcnt);3079 return (struct port_and_port_id){3080 sport, &sport->gid_id};3081 }3082 }3083 }3084 3085 return (struct port_and_port_id){};3086}3087 3088/**3089 * srpt_lookup_port() - Look up an RDMA port by name3090 * @name: ASCII port name3091 *3092 * Increments the RDMA port reference count if an RDMA port pointer is returned.3093 * The caller must drop that reference count by calling srpt_port_put_ref().3094 */3095static struct port_and_port_id srpt_lookup_port(const char *name)3096{3097 struct port_and_port_id papi;3098 3099 spin_lock(&srpt_dev_lock);3100 papi = __srpt_lookup_port(name);3101 spin_unlock(&srpt_dev_lock);3102 3103 return papi;3104}3105 3106static void srpt_free_srq(struct srpt_device *sdev)3107{3108 if (!sdev->srq)3109 return;3110 3111 ib_destroy_srq(sdev->srq);3112 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,3113 sdev->srq_size, sdev->req_buf_cache,3114 DMA_FROM_DEVICE);3115 srpt_cache_put(sdev->req_buf_cache);3116 sdev->srq = NULL;3117}3118 3119static int srpt_alloc_srq(struct srpt_device *sdev)3120{3121 struct ib_srq_init_attr srq_attr = {3122 .event_handler = srpt_srq_event,3123 .srq_context = (void *)sdev,3124 .attr.max_wr = sdev->srq_size,3125 .attr.max_sge = 1,3126 .srq_type = IB_SRQT_BASIC,3127 };3128 struct ib_device *device = sdev->device;3129 struct ib_srq *srq;3130 int i;3131 3132 WARN_ON_ONCE(sdev->srq);3133 srq = ib_create_srq(sdev->pd, &srq_attr);3134 if (IS_ERR(srq)) {3135 pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));3136 return PTR_ERR(srq);3137 }3138 3139 pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,3140 sdev->device->attrs.max_srq_wr, dev_name(&device->dev));3141 3142 sdev->req_buf_cache = srpt_cache_get(srp_max_req_size);3143 if (!sdev->req_buf_cache)3144 goto free_srq;3145 3146 sdev->ioctx_ring = (struct srpt_recv_ioctx **)3147 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,3148 sizeof(*sdev->ioctx_ring[0]),3149 sdev->req_buf_cache, 0, DMA_FROM_DEVICE);3150 if (!sdev->ioctx_ring)3151 goto free_cache;3152 3153 sdev->use_srq = true;3154 sdev->srq = srq;3155 3156 for (i = 0; i < sdev->srq_size; ++i) {3157 INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list);3158 srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);3159 }3160 3161 return 0;3162 3163free_cache:3164 srpt_cache_put(sdev->req_buf_cache);3165 3166free_srq:3167 ib_destroy_srq(srq);3168 return -ENOMEM;3169}3170 3171static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)3172{3173 struct ib_device *device = sdev->device;3174 int ret = 0;3175 3176 if (!use_srq) {3177 srpt_free_srq(sdev);3178 sdev->use_srq = false;3179 } else if (use_srq && !sdev->srq) {3180 ret = srpt_alloc_srq(sdev);3181 }3182 pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__,3183 dev_name(&device->dev), sdev->use_srq, ret);3184 return ret;3185}3186 3187static void srpt_free_sdev(struct kref *refcnt)3188{3189 struct srpt_device *sdev = container_of(refcnt, typeof(*sdev), refcnt);3190 3191 kfree(sdev);3192}3193 3194static void srpt_sdev_put(struct srpt_device *sdev)3195{3196 kref_put(&sdev->refcnt, srpt_free_sdev);3197}3198 3199/**3200 * srpt_add_one - InfiniBand device addition callback function3201 * @device: Describes a HCA.3202 */3203static int srpt_add_one(struct ib_device *device)3204{3205 struct srpt_device *sdev;3206 struct srpt_port *sport;3207 int ret;3208 u32 i;3209 3210 pr_debug("device = %p\n", device);3211 3212 sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt),3213 GFP_KERNEL);3214 if (!sdev)3215 return -ENOMEM;3216 3217 kref_init(&sdev->refcnt);3218 sdev->device = device;3219 mutex_init(&sdev->sdev_mutex);3220 3221 sdev->pd = ib_alloc_pd(device, 0);3222 if (IS_ERR(sdev->pd)) {3223 ret = PTR_ERR(sdev->pd);3224 goto free_dev;3225 }3226 3227 sdev->lkey = sdev->pd->local_dma_lkey;3228 3229 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);3230 3231 srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);3232 3233 if (!srpt_service_guid)3234 srpt_service_guid = be64_to_cpu(device->node_guid);3235 3236 if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)3237 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);3238 if (IS_ERR(sdev->cm_id)) {3239 pr_info("ib_create_cm_id() failed: %ld\n",3240 PTR_ERR(sdev->cm_id));3241 ret = PTR_ERR(sdev->cm_id);3242 sdev->cm_id = NULL;3243 if (!rdma_cm_id)3244 goto err_ring;3245 }3246 3247 /* print out target login information */3248 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n",3249 srpt_service_guid, srpt_service_guid, srpt_service_guid);3250 3251 /*3252 * We do not have a consistent service_id (ie. also id_ext of target_id)3253 * to identify this target. We currently use the guid of the first HCA3254 * in the system as service_id; therefore, the target_id will change3255 * if this HCA is gone bad and replaced by different HCA3256 */3257 ret = sdev->cm_id ?3258 ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid)) :3259 0;3260 if (ret < 0) {3261 pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret,3262 sdev->cm_id->state);3263 goto err_cm;3264 }3265 3266 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,3267 srpt_event_handler);3268 3269 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {3270 sport = &sdev->port[i - 1];3271 INIT_LIST_HEAD(&sport->nexus_list);3272 mutex_init(&sport->mutex);3273 sport->sdev = sdev;3274 sport->port = i;3275 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;3276 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;3277 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;3278 sport->port_attrib.use_srq = false;3279 INIT_WORK(&sport->work, srpt_refresh_port_work);3280 3281 ret = srpt_refresh_port(sport);3282 if (ret) {3283 pr_err("MAD registration failed for %s-%d.\n",3284 dev_name(&sdev->device->dev), i);3285 i--;3286 goto err_port;3287 }3288 }3289 3290 ib_register_event_handler(&sdev->event_handler);3291 spin_lock(&srpt_dev_lock);3292 list_add_tail(&sdev->list, &srpt_dev_list);3293 spin_unlock(&srpt_dev_lock);3294 3295 ib_set_client_data(device, &srpt_client, sdev);3296 pr_debug("added %s.\n", dev_name(&device->dev));3297 return 0;3298 3299err_port:3300 srpt_unregister_mad_agent(sdev, i);3301err_cm:3302 if (sdev->cm_id)3303 ib_destroy_cm_id(sdev->cm_id);3304err_ring:3305 srpt_free_srq(sdev);3306 ib_dealloc_pd(sdev->pd);3307free_dev:3308 srpt_sdev_put(sdev);3309 pr_info("%s(%s) failed.\n", __func__, dev_name(&device->dev));3310 return ret;3311}3312 3313/**3314 * srpt_remove_one - InfiniBand device removal callback function3315 * @device: Describes a HCA.3316 * @client_data: The value passed as the third argument to ib_set_client_data().3317 */3318static void srpt_remove_one(struct ib_device *device, void *client_data)3319{3320 struct srpt_device *sdev = client_data;3321 int i;3322 3323 srpt_unregister_mad_agent(sdev, sdev->device->phys_port_cnt);3324 3325 ib_unregister_event_handler(&sdev->event_handler);3326 3327 /* Cancel any work queued by the just unregistered IB event handler. */3328 for (i = 0; i < sdev->device->phys_port_cnt; i++)3329 cancel_work_sync(&sdev->port[i].work);3330 3331 if (sdev->cm_id)3332 ib_destroy_cm_id(sdev->cm_id);3333 3334 ib_set_client_data(device, &srpt_client, NULL);3335 3336 /*3337 * Unregistering a target must happen after destroying sdev->cm_id3338 * such that no new SRP_LOGIN_REQ information units can arrive while3339 * destroying the target.3340 */3341 spin_lock(&srpt_dev_lock);3342 list_del(&sdev->list);3343 spin_unlock(&srpt_dev_lock);3344 3345 for (i = 0; i < sdev->device->phys_port_cnt; i++)3346 srpt_release_sport(&sdev->port[i]);3347 3348 srpt_free_srq(sdev);3349 3350 ib_dealloc_pd(sdev->pd);3351 3352 srpt_sdev_put(sdev);3353}3354 3355static struct ib_client srpt_client = {3356 .name = DRV_NAME,3357 .add = srpt_add_one,3358 .remove = srpt_remove_one3359};3360 3361static int srpt_check_true(struct se_portal_group *se_tpg)3362{3363 return 1;3364}3365 3366static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)3367{3368 return tpg->se_tpg_wwn->priv;3369}3370 3371static struct srpt_port_id *srpt_wwn_to_sport_id(struct se_wwn *wwn)3372{3373 struct srpt_port *sport = wwn->priv;3374 3375 if (sport->guid_id && &sport->guid_id->wwn == wwn)3376 return sport->guid_id;3377 if (sport->gid_id && &sport->gid_id->wwn == wwn)3378 return sport->gid_id;3379 WARN_ON_ONCE(true);3380 return NULL;3381}3382 3383static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)3384{3385 struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);3386 3387 return stpg->sport_id->name;3388}3389 3390static u16 srpt_get_tag(struct se_portal_group *tpg)3391{3392 return 1;3393}3394 3395static void srpt_release_cmd(struct se_cmd *se_cmd)3396{3397 struct srpt_send_ioctx *ioctx = container_of(se_cmd,3398 struct srpt_send_ioctx, cmd);3399 struct srpt_rdma_ch *ch = ioctx->ch;3400 struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx;3401 3402 WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&3403 !(ioctx->cmd.transport_state & CMD_T_ABORTED));3404 3405 if (recv_ioctx) {3406 WARN_ON_ONCE(!list_empty(&recv_ioctx->wait_list));3407 ioctx->recv_ioctx = NULL;3408 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);3409 }3410 3411 if (ioctx->n_rw_ctx) {3412 srpt_free_rw_ctxs(ch, ioctx);3413 ioctx->n_rw_ctx = 0;3414 }3415 3416 target_free_tag(se_cmd->se_sess, se_cmd);3417}3418 3419/**3420 * srpt_close_session - forcibly close a session3421 * @se_sess: SCSI target session.3422 *3423 * Callback function invoked by the TCM core to clean up sessions associated3424 * with a node ACL when the user invokes3425 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id3426 */3427static void srpt_close_session(struct se_session *se_sess)3428{3429 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;3430 3431 srpt_disconnect_ch_sync(ch);3432}3433 3434/* Note: only used from inside debug printk's by the TCM core. */3435static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)3436{3437 struct srpt_send_ioctx *ioctx;3438 3439 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);3440 return ioctx->state;3441}3442 3443static int srpt_parse_guid(u64 *guid, const char *name)3444{3445 u16 w[4];3446 int ret = -EINVAL;3447 3448 if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)3449 goto out;3450 *guid = get_unaligned_be64(w);3451 ret = 0;3452out:3453 return ret;3454}3455 3456/**3457 * srpt_parse_i_port_id - parse an initiator port ID3458 * @name: ASCII representation of a 128-bit initiator port ID.3459 * @i_port_id: Binary 128-bit port ID.3460 */3461static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)3462{3463 const char *p;3464 unsigned len, count, leading_zero_bytes;3465 int ret;3466 3467 p = name;3468 if (strncasecmp(p, "0x", 2) == 0)3469 p += 2;3470 ret = -EINVAL;3471 len = strlen(p);3472 if (len % 2)3473 goto out;3474 count = min(len / 2, 16U);3475 leading_zero_bytes = 16 - count;3476 memset(i_port_id, 0, leading_zero_bytes);3477 ret = hex2bin(i_port_id + leading_zero_bytes, p, count);3478 3479out:3480 return ret;3481}3482 3483/*3484 * configfs callback function invoked for mkdir3485 * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id3486 *3487 * i_port_id must be an initiator port GUID, GID or IP address. See also the3488 * target_alloc_session() calls in this driver. Examples of valid initiator3489 * port IDs:3490 * 0x0000000000000000505400fffe4a0b7b3491 * 0000000000000000505400fffe4a0b7b3492 * 5054:00ff:fe4a:0b7b3493 * 192.168.122.763494 */3495static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)3496{3497 struct sockaddr_storage sa;3498 u64 guid;3499 u8 i_port_id[16];3500 int ret;3501 3502 ret = srpt_parse_guid(&guid, name);3503 if (ret < 0)3504 ret = srpt_parse_i_port_id(i_port_id, name);3505 if (ret < 0)3506 ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL,3507 &sa);3508 if (ret < 0)3509 pr_err("invalid initiator port ID %s\n", name);3510 return ret;3511}3512 3513static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,3514 char *page)3515{3516 struct se_portal_group *se_tpg = attrib_to_tpg(item);3517 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3518 3519 return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rdma_size);3520}3521 3522static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,3523 const char *page, size_t count)3524{3525 struct se_portal_group *se_tpg = attrib_to_tpg(item);3526 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3527 unsigned long val;3528 int ret;3529 3530 ret = kstrtoul(page, 0, &val);3531 if (ret < 0) {3532 pr_err("kstrtoul() failed with ret: %d\n", ret);3533 return -EINVAL;3534 }3535 if (val > MAX_SRPT_RDMA_SIZE) {3536 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,3537 MAX_SRPT_RDMA_SIZE);3538 return -EINVAL;3539 }3540 if (val < DEFAULT_MAX_RDMA_SIZE) {3541 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",3542 val, DEFAULT_MAX_RDMA_SIZE);3543 return -EINVAL;3544 }3545 sport->port_attrib.srp_max_rdma_size = val;3546 3547 return count;3548}3549 3550static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,3551 char *page)3552{3553 struct se_portal_group *se_tpg = attrib_to_tpg(item);3554 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3555 3556 return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rsp_size);3557}3558 3559static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,3560 const char *page, size_t count)3561{3562 struct se_portal_group *se_tpg = attrib_to_tpg(item);3563 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3564 unsigned long val;3565 int ret;3566 3567 ret = kstrtoul(page, 0, &val);3568 if (ret < 0) {3569 pr_err("kstrtoul() failed with ret: %d\n", ret);3570 return -EINVAL;3571 }3572 if (val > MAX_SRPT_RSP_SIZE) {3573 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,3574 MAX_SRPT_RSP_SIZE);3575 return -EINVAL;3576 }3577 if (val < MIN_MAX_RSP_SIZE) {3578 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,3579 MIN_MAX_RSP_SIZE);3580 return -EINVAL;3581 }3582 sport->port_attrib.srp_max_rsp_size = val;3583 3584 return count;3585}3586 3587static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,3588 char *page)3589{3590 struct se_portal_group *se_tpg = attrib_to_tpg(item);3591 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3592 3593 return sysfs_emit(page, "%u\n", sport->port_attrib.srp_sq_size);3594}3595 3596static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,3597 const char *page, size_t count)3598{3599 struct se_portal_group *se_tpg = attrib_to_tpg(item);3600 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3601 unsigned long val;3602 int ret;3603 3604 ret = kstrtoul(page, 0, &val);3605 if (ret < 0) {3606 pr_err("kstrtoul() failed with ret: %d\n", ret);3607 return -EINVAL;3608 }3609 if (val > MAX_SRPT_SRQ_SIZE) {3610 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,3611 MAX_SRPT_SRQ_SIZE);3612 return -EINVAL;3613 }3614 if (val < MIN_SRPT_SRQ_SIZE) {3615 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,3616 MIN_SRPT_SRQ_SIZE);3617 return -EINVAL;3618 }3619 sport->port_attrib.srp_sq_size = val;3620 3621 return count;3622}3623 3624static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,3625 char *page)3626{3627 struct se_portal_group *se_tpg = attrib_to_tpg(item);3628 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3629 3630 return sysfs_emit(page, "%d\n", sport->port_attrib.use_srq);3631}3632 3633static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,3634 const char *page, size_t count)3635{3636 struct se_portal_group *se_tpg = attrib_to_tpg(item);3637 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3638 struct srpt_device *sdev = sport->sdev;3639 unsigned long val;3640 bool enabled;3641 int ret;3642 3643 ret = kstrtoul(page, 0, &val);3644 if (ret < 0)3645 return ret;3646 if (val != !!val)3647 return -EINVAL;3648 3649 ret = mutex_lock_interruptible(&sdev->sdev_mutex);3650 if (ret < 0)3651 return ret;3652 ret = mutex_lock_interruptible(&sport->mutex);3653 if (ret < 0)3654 goto unlock_sdev;3655 enabled = sport->enabled;3656 /* Log out all initiator systems before changing 'use_srq'. */3657 srpt_set_enabled(sport, false);3658 sport->port_attrib.use_srq = val;3659 srpt_use_srq(sdev, sport->port_attrib.use_srq);3660 srpt_set_enabled(sport, enabled);3661 ret = count;3662 mutex_unlock(&sport->mutex);3663unlock_sdev:3664 mutex_unlock(&sdev->sdev_mutex);3665 3666 return ret;3667}3668 3669CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);3670CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);3671CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);3672CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);3673 3674static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {3675 &srpt_tpg_attrib_attr_srp_max_rdma_size,3676 &srpt_tpg_attrib_attr_srp_max_rsp_size,3677 &srpt_tpg_attrib_attr_srp_sq_size,3678 &srpt_tpg_attrib_attr_use_srq,3679 NULL,3680};3681 3682static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr)3683{3684 struct rdma_cm_id *rdma_cm_id;3685 int ret;3686 3687 rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler,3688 NULL, RDMA_PS_TCP, IB_QPT_RC);3689 if (IS_ERR(rdma_cm_id)) {3690 pr_err("RDMA/CM ID creation failed: %ld\n",3691 PTR_ERR(rdma_cm_id));3692 goto out;3693 }3694 3695 ret = rdma_bind_addr(rdma_cm_id, listen_addr);3696 if (ret) {3697 char addr_str[64];3698 3699 snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr);3700 pr_err("Binding RDMA/CM ID to address %s failed: %d\n",3701 addr_str, ret);3702 rdma_destroy_id(rdma_cm_id);3703 rdma_cm_id = ERR_PTR(ret);3704 goto out;3705 }3706 3707 ret = rdma_listen(rdma_cm_id, 128);3708 if (ret) {3709 pr_err("rdma_listen() failed: %d\n", ret);3710 rdma_destroy_id(rdma_cm_id);3711 rdma_cm_id = ERR_PTR(ret);3712 }3713 3714out:3715 return rdma_cm_id;3716}3717 3718static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page)3719{3720 return sysfs_emit(page, "%d\n", rdma_cm_port);3721}3722 3723static ssize_t srpt_rdma_cm_port_store(struct config_item *item,3724 const char *page, size_t count)3725{3726 struct sockaddr_in addr4 = { .sin_family = AF_INET };3727 struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 };3728 struct rdma_cm_id *new_id = NULL;3729 u16 val;3730 int ret;3731 3732 ret = kstrtou16(page, 0, &val);3733 if (ret < 0)3734 return ret;3735 ret = count;3736 if (rdma_cm_port == val)3737 goto out;3738 3739 if (val) {3740 addr6.sin6_port = cpu_to_be16(val);3741 new_id = srpt_create_rdma_id((struct sockaddr *)&addr6);3742 if (IS_ERR(new_id)) {3743 addr4.sin_port = cpu_to_be16(val);3744 new_id = srpt_create_rdma_id((struct sockaddr *)&addr4);3745 if (IS_ERR(new_id)) {3746 ret = PTR_ERR(new_id);3747 goto out;3748 }3749 }3750 }3751 3752 mutex_lock(&rdma_cm_mutex);3753 rdma_cm_port = val;3754 swap(rdma_cm_id, new_id);3755 mutex_unlock(&rdma_cm_mutex);3756 3757 if (new_id)3758 rdma_destroy_id(new_id);3759 ret = count;3760out:3761 return ret;3762}3763 3764CONFIGFS_ATTR(srpt_, rdma_cm_port);3765 3766static struct configfs_attribute *srpt_da_attrs[] = {3767 &srpt_attr_rdma_cm_port,3768 NULL,3769};3770 3771static int srpt_enable_tpg(struct se_portal_group *se_tpg, bool enable)3772{3773 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);3774 3775 mutex_lock(&sport->mutex);3776 srpt_set_enabled(sport, enable);3777 mutex_unlock(&sport->mutex);3778 3779 return 0;3780}3781 3782/**3783 * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg3784 * @wwn: Corresponds to $driver/$port.3785 * @name: $tpg.3786 */3787static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,3788 const char *name)3789{3790 struct srpt_port_id *sport_id = srpt_wwn_to_sport_id(wwn);3791 struct srpt_tpg *stpg;3792 int res = -ENOMEM;3793 3794 stpg = kzalloc(sizeof(*stpg), GFP_KERNEL);3795 if (!stpg)3796 return ERR_PTR(res);3797 stpg->sport_id = sport_id;3798 res = core_tpg_register(wwn, &stpg->tpg, SCSI_PROTOCOL_SRP);3799 if (res) {3800 kfree(stpg);3801 return ERR_PTR(res);3802 }3803 3804 mutex_lock(&sport_id->mutex);3805 list_add_tail(&stpg->entry, &sport_id->tpg_list);3806 mutex_unlock(&sport_id->mutex);3807 3808 return &stpg->tpg;3809}3810 3811/**3812 * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg3813 * @tpg: Target portal group to deregister.3814 */3815static void srpt_drop_tpg(struct se_portal_group *tpg)3816{3817 struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);3818 struct srpt_port_id *sport_id = stpg->sport_id;3819 struct srpt_port *sport = srpt_tpg_to_sport(tpg);3820 3821 mutex_lock(&sport_id->mutex);3822 list_del(&stpg->entry);3823 mutex_unlock(&sport_id->mutex);3824 3825 sport->enabled = false;3826 core_tpg_deregister(tpg);3827 kfree(stpg);3828}3829 3830/**3831 * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port3832 * @tf: Not used.3833 * @group: Not used.3834 * @name: $port.3835 */3836static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,3837 struct config_group *group,3838 const char *name)3839{3840 struct port_and_port_id papi = srpt_lookup_port(name);3841 struct srpt_port *sport = papi.sport;3842 struct srpt_port_id *port_id;3843 3844 if (!papi.port_id)3845 return ERR_PTR(-EINVAL);3846 if (*papi.port_id) {3847 /* Attempt to create a directory that already exists. */3848 WARN_ON_ONCE(true);3849 return &(*papi.port_id)->wwn;3850 }3851 port_id = kzalloc(sizeof(*port_id), GFP_KERNEL);3852 if (!port_id) {3853 srpt_sdev_put(sport->sdev);3854 return ERR_PTR(-ENOMEM);3855 }3856 mutex_init(&port_id->mutex);3857 INIT_LIST_HEAD(&port_id->tpg_list);3858 port_id->wwn.priv = sport;3859 memcpy(port_id->name, port_id == sport->guid_id ? sport->guid_name :3860 sport->gid_name, ARRAY_SIZE(port_id->name));3861 3862 *papi.port_id = port_id;3863 3864 return &port_id->wwn;3865}3866 3867/**3868 * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port3869 * @wwn: $port.3870 */3871static void srpt_drop_tport(struct se_wwn *wwn)3872{3873 struct srpt_port_id *port_id = container_of(wwn, typeof(*port_id), wwn);3874 struct srpt_port *sport = wwn->priv;3875 3876 if (sport->guid_id == port_id)3877 sport->guid_id = NULL;3878 else if (sport->gid_id == port_id)3879 sport->gid_id = NULL;3880 else3881 WARN_ON_ONCE(true);3882 3883 srpt_sdev_put(sport->sdev);3884 kfree(port_id);3885}3886 3887static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)3888{3889 return sysfs_emit(buf, "\n");3890}3891 3892CONFIGFS_ATTR_RO(srpt_wwn_, version);3893 3894static struct configfs_attribute *srpt_wwn_attrs[] = {3895 &srpt_wwn_attr_version,3896 NULL,3897};3898 3899static const struct target_core_fabric_ops srpt_template = {3900 .module = THIS_MODULE,3901 .fabric_name = "srpt",3902 .tpg_get_wwn = srpt_get_fabric_wwn,3903 .tpg_get_tag = srpt_get_tag,3904 .tpg_check_demo_mode_cache = srpt_check_true,3905 .tpg_check_demo_mode_write_protect = srpt_check_true,3906 .release_cmd = srpt_release_cmd,3907 .check_stop_free = srpt_check_stop_free,3908 .close_session = srpt_close_session,3909 .sess_get_initiator_sid = NULL,3910 .write_pending = srpt_write_pending,3911 .get_cmd_state = srpt_get_tcm_cmd_state,3912 .queue_data_in = srpt_queue_data_in,3913 .queue_status = srpt_queue_status,3914 .queue_tm_rsp = srpt_queue_tm_rsp,3915 .aborted_task = srpt_aborted_task,3916 /*3917 * Setup function pointers for generic logic in3918 * target_core_fabric_configfs.c3919 */3920 .fabric_make_wwn = srpt_make_tport,3921 .fabric_drop_wwn = srpt_drop_tport,3922 .fabric_make_tpg = srpt_make_tpg,3923 .fabric_enable_tpg = srpt_enable_tpg,3924 .fabric_drop_tpg = srpt_drop_tpg,3925 .fabric_init_nodeacl = srpt_init_nodeacl,3926 3927 .tfc_discovery_attrs = srpt_da_attrs,3928 .tfc_wwn_attrs = srpt_wwn_attrs,3929 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,3930 3931 .default_submit_type = TARGET_DIRECT_SUBMIT,3932 .direct_submit_supp = 1,3933};3934 3935/**3936 * srpt_init_module - kernel module initialization3937 *3938 * Note: Since ib_register_client() registers callback functions, and since at3939 * least one of these callback functions (srpt_add_one()) calls target core3940 * functions, this driver must be registered with the target core before3941 * ib_register_client() is called.3942 */3943static int __init srpt_init_module(void)3944{3945 int ret;3946 3947 ret = -EINVAL;3948 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {3949 pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n",3950 srp_max_req_size, MIN_MAX_REQ_SIZE);3951 goto out;3952 }3953 3954 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE3955 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {3956 pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n",3957 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);3958 goto out;3959 }3960 3961 ret = target_register_template(&srpt_template);3962 if (ret)3963 goto out;3964 3965 ret = ib_register_client(&srpt_client);3966 if (ret) {3967 pr_err("couldn't register IB client\n");3968 goto out_unregister_target;3969 }3970 3971 return 0;3972 3973out_unregister_target:3974 target_unregister_template(&srpt_template);3975out:3976 return ret;3977}3978 3979static void __exit srpt_cleanup_module(void)3980{3981 if (rdma_cm_id)3982 rdma_destroy_id(rdma_cm_id);3983 ib_unregister_client(&srpt_client);3984 target_unregister_template(&srpt_template);3985}3986 3987module_init(srpt_init_module);3988module_exit(srpt_cleanup_module);3989