2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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>
52 /* Name of this kernel module. */
53 #define DRV_NAME "ib_srpt"
55 #define SRPT_ID_STRING "Linux SRP target"
58 #define pr_fmt(fmt) DRV_NAME " " fmt
60 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
61 MODULE_DESCRIPTION("SCSI RDMA Protocol target driver");
62 MODULE_LICENSE("Dual BSD/GPL");
68 static u64 srpt_service_guid;
69 static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
70 static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
72 static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
73 module_param(srp_max_req_size, int, 0444);
74 MODULE_PARM_DESC(srp_max_req_size,
75 "Maximum size of SRP request messages in bytes.");
77 static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
78 module_param(srpt_srq_size, int, 0444);
79 MODULE_PARM_DESC(srpt_srq_size,
80 "Shared receive queue (SRQ) size.");
82 static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
84 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
86 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
88 MODULE_PARM_DESC(srpt_service_guid,
89 "Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA.");
91 static struct ib_client srpt_client;
92 /* Protects both rdma_cm_port and rdma_cm_id. */
93 static DEFINE_MUTEX(rdma_cm_mutex);
94 /* Port number RDMA/CM will bind to. */
95 static u16 rdma_cm_port;
96 static struct rdma_cm_id *rdma_cm_id;
97 static void srpt_release_cmd(struct se_cmd *se_cmd);
98 static void srpt_free_ch(struct kref *kref);
99 static int srpt_queue_status(struct se_cmd *cmd);
100 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
101 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
102 static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
105 * The only allowed channel state changes are those that change the channel
106 * state into a state with a higher numerical value. Hence the new > prev test.
108 static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
111 enum rdma_ch_state prev;
112 bool changed = false;
114 spin_lock_irqsave(&ch->spinlock, flags);
120 spin_unlock_irqrestore(&ch->spinlock, flags);
126 * srpt_event_handler - asynchronous IB event callback function
127 * @handler: IB event handler registered by ib_register_event_handler().
128 * @event: Description of the event that occurred.
130 * Callback function called by the InfiniBand core when an asynchronous IB
131 * event occurs. This callback may occur in interrupt context. See also
132 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
133 * Architecture Specification.
135 static void srpt_event_handler(struct ib_event_handler *handler,
136 struct ib_event *event)
138 struct srpt_device *sdev;
139 struct srpt_port *sport;
142 sdev = ib_get_client_data(event->device, &srpt_client);
143 if (!sdev || sdev->device != event->device)
146 pr_debug("ASYNC event= %d on device= %s\n", event->event,
147 dev_name(&sdev->device->dev));
149 switch (event->event) {
150 case IB_EVENT_PORT_ERR:
151 port_num = event->element.port_num - 1;
152 if (port_num < sdev->device->phys_port_cnt) {
153 sport = &sdev->port[port_num];
157 WARN(true, "event %d: port_num %d out of range 1..%d\n",
158 event->event, port_num + 1,
159 sdev->device->phys_port_cnt);
162 case IB_EVENT_PORT_ACTIVE:
163 case IB_EVENT_LID_CHANGE:
164 case IB_EVENT_PKEY_CHANGE:
165 case IB_EVENT_SM_CHANGE:
166 case IB_EVENT_CLIENT_REREGISTER:
167 case IB_EVENT_GID_CHANGE:
168 /* Refresh port data asynchronously. */
169 port_num = event->element.port_num - 1;
170 if (port_num < sdev->device->phys_port_cnt) {
171 sport = &sdev->port[port_num];
172 if (!sport->lid && !sport->sm_lid)
173 schedule_work(&sport->work);
175 WARN(true, "event %d: port_num %d out of range 1..%d\n",
176 event->event, port_num + 1,
177 sdev->device->phys_port_cnt);
181 pr_err("received unrecognized IB event %d\n", event->event);
187 * srpt_srq_event - SRQ event callback function
188 * @event: Description of the event that occurred.
189 * @ctx: Context pointer specified at SRQ creation time.
191 static void srpt_srq_event(struct ib_event *event, void *ctx)
193 pr_debug("SRQ event %d\n", event->event);
196 static const char *get_ch_state_name(enum rdma_ch_state s)
203 case CH_DISCONNECTING:
204 return "disconnecting";
207 case CH_DISCONNECTED:
208 return "disconnected";
214 * srpt_qp_event - QP event callback function
215 * @event: Description of the event that occurred.
216 * @ch: SRPT RDMA channel.
218 static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
220 pr_debug("QP event %d on ch=%p sess_name=%s state=%d\n",
221 event->event, ch, ch->sess_name, ch->state);
223 switch (event->event) {
224 case IB_EVENT_COMM_EST:
225 if (ch->using_rdma_cm)
226 rdma_notify(ch->rdma_cm.cm_id, event->event);
228 ib_cm_notify(ch->ib_cm.cm_id, event->event);
230 case IB_EVENT_QP_LAST_WQE_REACHED:
231 pr_debug("%s-%d, state %s: received Last WQE event.\n",
232 ch->sess_name, ch->qp->qp_num,
233 get_ch_state_name(ch->state));
236 pr_err("received unrecognized IB QP event %d\n", event->event);
242 * srpt_set_ioc - initialize a IOUnitInfo structure
243 * @c_list: controller list.
244 * @slot: one-based slot number.
245 * @value: four-bit value.
247 * Copies the lowest four bits of value in element slot of the array of four
248 * bit elements called c_list (controller list). The index slot is one-based.
250 static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
257 tmp = c_list[id] & 0xf;
258 c_list[id] = (value << 4) | tmp;
260 tmp = c_list[id] & 0xf0;
261 c_list[id] = (value & 0xf) | tmp;
266 * srpt_get_class_port_info - copy ClassPortInfo to a management datagram
267 * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO.
269 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
272 static void srpt_get_class_port_info(struct ib_dm_mad *mad)
274 struct ib_class_port_info *cif;
276 cif = (struct ib_class_port_info *)mad->data;
277 memset(cif, 0, sizeof(*cif));
278 cif->base_version = 1;
279 cif->class_version = 1;
281 ib_set_cpi_resp_time(cif, 20);
282 mad->mad_hdr.status = 0;
286 * srpt_get_iou - write IOUnitInfo to a management datagram
287 * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO.
289 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
290 * Specification. See also section B.7, table B.6 in the SRP r16a document.
292 static void srpt_get_iou(struct ib_dm_mad *mad)
294 struct ib_dm_iou_info *ioui;
298 ioui = (struct ib_dm_iou_info *)mad->data;
299 ioui->change_id = cpu_to_be16(1);
300 ioui->max_controllers = 16;
302 /* set present for slot 1 and empty for the rest */
303 srpt_set_ioc(ioui->controller_list, 1, 1);
304 for (i = 1, slot = 2; i < 16; i++, slot++)
305 srpt_set_ioc(ioui->controller_list, slot, 0);
307 mad->mad_hdr.status = 0;
311 * srpt_get_ioc - write IOControllerprofile to a management datagram
312 * @sport: HCA port through which the MAD has been received.
313 * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query.
314 * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE.
316 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
317 * Architecture Specification. See also section B.7, table B.7 in the SRP
320 static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
321 struct ib_dm_mad *mad)
323 struct srpt_device *sdev = sport->sdev;
324 struct ib_dm_ioc_profile *iocp;
325 int send_queue_depth;
327 iocp = (struct ib_dm_ioc_profile *)mad->data;
329 if (!slot || slot > 16) {
331 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
337 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
342 send_queue_depth = sdev->srq_size;
344 send_queue_depth = min(MAX_SRPT_RQ_SIZE,
345 sdev->device->attrs.max_qp_wr);
347 memset(iocp, 0, sizeof(*iocp));
348 strcpy(iocp->id_string, SRPT_ID_STRING);
349 iocp->guid = cpu_to_be64(srpt_service_guid);
350 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
351 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
352 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
353 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
354 iocp->subsys_device_id = 0x0;
355 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
356 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
357 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
358 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
359 iocp->send_queue_depth = cpu_to_be16(send_queue_depth);
360 iocp->rdma_read_depth = 4;
361 iocp->send_size = cpu_to_be32(srp_max_req_size);
362 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
364 iocp->num_svc_entries = 1;
365 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
366 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
368 mad->mad_hdr.status = 0;
372 * srpt_get_svc_entries - write ServiceEntries to a management datagram
373 * @ioc_guid: I/O controller GUID to use in reply.
374 * @slot: I/O controller number.
375 * @hi: End of the range of service entries to be specified in the reply.
376 * @lo: Start of the range of service entries to be specified in the reply..
377 * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES.
379 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
380 * Specification. See also section B.7, table B.8 in the SRP r16a document.
382 static void srpt_get_svc_entries(u64 ioc_guid,
383 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
385 struct ib_dm_svc_entries *svc_entries;
389 if (!slot || slot > 16) {
391 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
395 if (slot > 2 || lo > hi || hi > 1) {
397 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
401 svc_entries = (struct ib_dm_svc_entries *)mad->data;
402 memset(svc_entries, 0, sizeof(*svc_entries));
403 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
404 snprintf(svc_entries->service_entries[0].name,
405 sizeof(svc_entries->service_entries[0].name),
407 SRP_SERVICE_NAME_PREFIX,
410 mad->mad_hdr.status = 0;
414 * srpt_mgmt_method_get - process a received management datagram
415 * @sp: HCA port through which the MAD has been received.
416 * @rq_mad: received MAD.
417 * @rsp_mad: response MAD.
419 static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
420 struct ib_dm_mad *rsp_mad)
426 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
428 case DM_ATTR_CLASS_PORT_INFO:
429 srpt_get_class_port_info(rsp_mad);
431 case DM_ATTR_IOU_INFO:
432 srpt_get_iou(rsp_mad);
434 case DM_ATTR_IOC_PROFILE:
435 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
436 srpt_get_ioc(sp, slot, rsp_mad);
438 case DM_ATTR_SVC_ENTRIES:
439 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
440 hi = (u8) ((slot >> 8) & 0xff);
441 lo = (u8) (slot & 0xff);
442 slot = (u16) ((slot >> 16) & 0xffff);
443 srpt_get_svc_entries(srpt_service_guid,
444 slot, hi, lo, rsp_mad);
447 rsp_mad->mad_hdr.status =
448 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
454 * srpt_mad_send_handler - MAD send completion callback
455 * @mad_agent: Return value of ib_register_mad_agent().
456 * @mad_wc: Work completion reporting that the MAD has been sent.
458 static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
459 struct ib_mad_send_wc *mad_wc)
461 rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);
462 ib_free_send_mad(mad_wc->send_buf);
466 * srpt_mad_recv_handler - MAD reception callback function
467 * @mad_agent: Return value of ib_register_mad_agent().
468 * @send_buf: Not used.
469 * @mad_wc: Work completion reporting that a MAD has been received.
471 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
472 struct ib_mad_send_buf *send_buf,
473 struct ib_mad_recv_wc *mad_wc)
475 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
477 struct ib_mad_send_buf *rsp;
478 struct ib_dm_mad *dm_mad;
480 if (!mad_wc || !mad_wc->recv_buf.mad)
483 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
484 mad_wc->recv_buf.grh, mad_agent->port_num);
488 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
490 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
491 mad_wc->wc->pkey_index, 0,
492 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
494 IB_MGMT_BASE_VERSION);
501 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
502 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
503 dm_mad->mad_hdr.status = 0;
505 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
506 case IB_MGMT_METHOD_GET:
507 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
509 case IB_MGMT_METHOD_SET:
510 dm_mad->mad_hdr.status =
511 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
514 dm_mad->mad_hdr.status =
515 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
519 if (!ib_post_send_mad(rsp, NULL)) {
520 ib_free_recv_mad(mad_wc);
521 /* will destroy_ah & free_send_mad in send completion */
525 ib_free_send_mad(rsp);
528 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
530 ib_free_recv_mad(mad_wc);
533 static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)
535 const __be16 *g = (const __be16 *)guid;
537 return snprintf(buf, size, "%04x:%04x:%04x:%04x",
538 be16_to_cpu(g[0]), be16_to_cpu(g[1]),
539 be16_to_cpu(g[2]), be16_to_cpu(g[3]));
543 * srpt_refresh_port - configure a HCA port
544 * @sport: SRPT HCA port.
546 * Enable InfiniBand management datagram processing, update the cached sm_lid,
547 * lid and gid values, and register a callback function for processing MADs
548 * on the specified port.
550 * Note: It is safe to call this function more than once for the same port.
552 static int srpt_refresh_port(struct srpt_port *sport)
554 struct ib_mad_reg_req reg_req;
555 struct ib_port_modify port_modify;
556 struct ib_port_attr port_attr;
559 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
563 sport->sm_lid = port_attr.sm_lid;
564 sport->lid = port_attr.lid;
566 ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
570 sport->port_guid_wwn.priv = sport;
571 srpt_format_guid(sport->port_guid, sizeof(sport->port_guid),
572 &sport->gid.global.interface_id);
573 sport->port_gid_wwn.priv = sport;
574 snprintf(sport->port_gid, sizeof(sport->port_gid),
576 be64_to_cpu(sport->gid.global.subnet_prefix),
577 be64_to_cpu(sport->gid.global.interface_id));
579 if (rdma_protocol_iwarp(sport->sdev->device, sport->port))
582 memset(&port_modify, 0, sizeof(port_modify));
583 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
584 port_modify.clr_port_cap_mask = 0;
586 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
588 pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n",
589 dev_name(&sport->sdev->device->dev), sport->port, ret);
593 if (!sport->mad_agent) {
594 memset(®_req, 0, sizeof(reg_req));
595 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
596 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
597 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
598 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
600 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
604 srpt_mad_send_handler,
605 srpt_mad_recv_handler,
607 if (IS_ERR(sport->mad_agent)) {
608 pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n",
609 dev_name(&sport->sdev->device->dev), sport->port,
610 PTR_ERR(sport->mad_agent));
611 sport->mad_agent = NULL;
619 * srpt_unregister_mad_agent - unregister MAD callback functions
620 * @sdev: SRPT HCA pointer.
622 * Note: It is safe to call this function more than once for the same device.
624 static void srpt_unregister_mad_agent(struct srpt_device *sdev)
626 struct ib_port_modify port_modify = {
627 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
629 struct srpt_port *sport;
632 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
633 sport = &sdev->port[i - 1];
634 WARN_ON(sport->port != i);
635 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
636 pr_err("disabling MAD processing failed.\n");
637 if (sport->mad_agent) {
638 ib_unregister_mad_agent(sport->mad_agent);
639 sport->mad_agent = NULL;
645 * srpt_alloc_ioctx - allocate a SRPT I/O context structure
646 * @sdev: SRPT HCA pointer.
647 * @ioctx_size: I/O context size.
648 * @buf_cache: I/O buffer cache.
649 * @dir: DMA data direction.
651 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
653 struct kmem_cache *buf_cache,
654 enum dma_data_direction dir)
656 struct srpt_ioctx *ioctx;
658 ioctx = kzalloc(ioctx_size, GFP_KERNEL);
662 ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL);
666 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf,
667 kmem_cache_size(buf_cache), dir);
668 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
674 kmem_cache_free(buf_cache, ioctx->buf);
682 * srpt_free_ioctx - free a SRPT I/O context structure
683 * @sdev: SRPT HCA pointer.
684 * @ioctx: I/O context pointer.
685 * @buf_cache: I/O buffer cache.
686 * @dir: DMA data direction.
688 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
689 struct kmem_cache *buf_cache,
690 enum dma_data_direction dir)
695 ib_dma_unmap_single(sdev->device, ioctx->dma,
696 kmem_cache_size(buf_cache), dir);
697 kmem_cache_free(buf_cache, ioctx->buf);
702 * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures
703 * @sdev: Device to allocate the I/O context ring for.
704 * @ring_size: Number of elements in the I/O context ring.
705 * @ioctx_size: I/O context size.
706 * @buf_cache: I/O buffer cache.
707 * @alignment_offset: Offset in each ring buffer at which the SRP information
709 * @dir: DMA data direction.
711 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
712 int ring_size, int ioctx_size,
713 struct kmem_cache *buf_cache,
714 int alignment_offset,
715 enum dma_data_direction dir)
717 struct srpt_ioctx **ring;
720 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) &&
721 ioctx_size != sizeof(struct srpt_send_ioctx));
723 ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL);
726 for (i = 0; i < ring_size; ++i) {
727 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir);
731 ring[i]->offset = alignment_offset;
737 srpt_free_ioctx(sdev, ring[i], buf_cache, dir);
745 * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures
746 * @ioctx_ring: I/O context ring to be freed.
747 * @sdev: SRPT HCA pointer.
748 * @ring_size: Number of ring elements.
749 * @buf_cache: I/O buffer cache.
750 * @dir: DMA data direction.
752 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
753 struct srpt_device *sdev, int ring_size,
754 struct kmem_cache *buf_cache,
755 enum dma_data_direction dir)
762 for (i = 0; i < ring_size; ++i)
763 srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir);
768 * srpt_set_cmd_state - set the state of a SCSI command
769 * @ioctx: Send I/O context.
770 * @new: New I/O context state.
772 * Does not modify the state of aborted commands. Returns the previous command
775 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
776 enum srpt_command_state new)
778 enum srpt_command_state previous;
780 previous = ioctx->state;
781 if (previous != SRPT_STATE_DONE)
788 * srpt_test_and_set_cmd_state - test and set the state of a command
789 * @ioctx: Send I/O context.
790 * @old: Current I/O context state.
791 * @new: New I/O context state.
793 * Returns true if and only if the previous command state was equal to 'old'.
795 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
796 enum srpt_command_state old,
797 enum srpt_command_state new)
799 enum srpt_command_state previous;
802 WARN_ON(old == SRPT_STATE_DONE);
803 WARN_ON(new == SRPT_STATE_NEW);
805 previous = ioctx->state;
809 return previous == old;
813 * srpt_post_recv - post an IB receive request
814 * @sdev: SRPT HCA pointer.
815 * @ch: SRPT RDMA channel.
816 * @ioctx: Receive I/O context pointer.
818 static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
819 struct srpt_recv_ioctx *ioctx)
822 struct ib_recv_wr wr;
825 list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset;
826 list.length = srp_max_req_size;
827 list.lkey = sdev->lkey;
829 ioctx->ioctx.cqe.done = srpt_recv_done;
830 wr.wr_cqe = &ioctx->ioctx.cqe;
836 return ib_post_srq_recv(sdev->srq, &wr, NULL);
838 return ib_post_recv(ch->qp, &wr, NULL);
842 * srpt_zerolength_write - perform a zero-length RDMA write
843 * @ch: SRPT RDMA channel.
845 * A quote from the InfiniBand specification: C9-88: For an HCA responder
846 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
847 * request, the R_Key shall not be validated, even if the request includes
850 static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
852 struct ib_rdma_wr wr = {
855 { .wr_cqe = &ch->zw_cqe, },
856 .opcode = IB_WR_RDMA_WRITE,
857 .send_flags = IB_SEND_SIGNALED,
861 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
864 return ib_post_send(ch->qp, &wr.wr, NULL);
867 static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
869 struct srpt_rdma_ch *ch = cq->cq_context;
871 pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num,
874 if (wc->status == IB_WC_SUCCESS) {
875 srpt_process_wait_list(ch);
877 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
878 schedule_work(&ch->release_work);
880 pr_debug("%s-%d: already disconnected.\n",
881 ch->sess_name, ch->qp->qp_num);
885 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
886 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
889 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
890 struct srpt_rdma_ch *ch = ioctx->ch;
891 struct scatterlist *prev = NULL;
896 ioctx->rw_ctxs = &ioctx->s_rw_ctx;
898 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
904 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
905 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
906 u64 remote_addr = be64_to_cpu(db->va);
907 u32 size = be32_to_cpu(db->len);
908 u32 rkey = be32_to_cpu(db->key);
910 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
915 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
916 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
918 target_free_sgl(ctx->sg, ctx->nents);
922 ioctx->n_rdma += ret;
926 sg_unmark_end(&prev[prev_nents - 1]);
927 sg_chain(prev, prev_nents + 1, ctx->sg);
933 prev_nents = ctx->nents;
935 *sg_cnt += ctx->nents;
942 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
944 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
945 ctx->sg, ctx->nents, dir);
946 target_free_sgl(ctx->sg, ctx->nents);
948 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
949 kfree(ioctx->rw_ctxs);
953 static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
954 struct srpt_send_ioctx *ioctx)
956 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
959 for (i = 0; i < ioctx->n_rw_ctx; i++) {
960 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
962 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
963 ctx->sg, ctx->nents, dir);
964 target_free_sgl(ctx->sg, ctx->nents);
967 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
968 kfree(ioctx->rw_ctxs);
971 static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
974 * The pointer computations below will only be compiled correctly
975 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
976 * whether srp_cmd::add_data has been declared as a byte pointer.
978 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
979 !__same_type(srp_cmd->add_data[0], (u8)0));
982 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
983 * CDB LENGTH' field are reserved and the size in bytes of this field
984 * is four times the value specified in bits 3..7. Hence the "& ~3".
986 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
990 * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request
991 * @recv_ioctx: I/O context associated with the received command @srp_cmd.
992 * @ioctx: I/O context that will be used for responding to the initiator.
993 * @srp_cmd: Pointer to the SRP_CMD request data.
994 * @dir: Pointer to the variable to which the transfer direction will be
996 * @sg: [out] scatterlist for the parsed SRP_CMD.
997 * @sg_cnt: [out] length of @sg.
998 * @data_len: Pointer to the variable to which the total data length of all
999 * descriptors in the SRP_CMD request will be written.
1000 * @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data
1003 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
1005 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
1006 * -ENOMEM when memory allocation fails and zero upon success.
1008 static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx,
1009 struct srpt_send_ioctx *ioctx,
1010 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
1011 struct scatterlist **sg, unsigned int *sg_cnt, u64 *data_len,
1012 u16 imm_data_offset)
1018 * The lower four bits of the buffer format field contain the DATA-IN
1019 * buffer descriptor format, and the highest four bits contain the
1020 * DATA-OUT buffer descriptor format.
1022 if (srp_cmd->buf_fmt & 0xf)
1023 /* DATA-IN: transfer data from target to initiator (read). */
1024 *dir = DMA_FROM_DEVICE;
1025 else if (srp_cmd->buf_fmt >> 4)
1026 /* DATA-OUT: transfer data from initiator to target (write). */
1027 *dir = DMA_TO_DEVICE;
1031 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
1032 ioctx->cmd.data_direction = *dir;
1034 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
1035 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
1036 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
1038 *data_len = be32_to_cpu(db->len);
1039 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
1040 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
1041 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
1042 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
1043 int nbufs = be32_to_cpu(idb->table_desc.len) /
1044 sizeof(struct srp_direct_buf);
1047 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
1048 pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n",
1049 srp_cmd->data_out_desc_cnt,
1050 srp_cmd->data_in_desc_cnt,
1051 be32_to_cpu(idb->table_desc.len),
1052 sizeof(struct srp_direct_buf));
1056 *data_len = be32_to_cpu(idb->len);
1057 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
1059 } else if ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_IMM) {
1060 struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd);
1061 void *data = (void *)srp_cmd + imm_data_offset;
1062 uint32_t len = be32_to_cpu(imm_buf->len);
1063 uint32_t req_size = imm_data_offset + len;
1065 if (req_size > srp_max_req_size) {
1066 pr_err("Immediate data (length %d + %d) exceeds request size %d\n",
1067 imm_data_offset, len, srp_max_req_size);
1070 if (recv_ioctx->byte_len < req_size) {
1071 pr_err("Received too few data - %d < %d\n",
1072 recv_ioctx->byte_len, req_size);
1076 * The immediate data buffer descriptor must occur before the
1077 * immediate data itself.
1079 if ((void *)(imm_buf + 1) > (void *)data) {
1080 pr_err("Received invalid write request\n");
1084 ioctx->recv_ioctx = recv_ioctx;
1085 if ((uintptr_t)data & 511) {
1086 pr_warn_once("Internal error - the receive buffers are not aligned properly.\n");
1089 sg_init_one(&ioctx->imm_sg, data, len);
1090 *sg = &ioctx->imm_sg;
1100 * srpt_init_ch_qp - initialize queue pair attributes
1101 * @ch: SRPT RDMA channel.
1102 * @qp: Queue pair pointer.
1104 * Initialized the attributes of queue pair 'qp' by allowing local write,
1105 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
1107 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1109 struct ib_qp_attr *attr;
1112 WARN_ON_ONCE(ch->using_rdma_cm);
1114 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
1118 attr->qp_state = IB_QPS_INIT;
1119 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1120 attr->port_num = ch->sport->port;
1122 ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port,
1123 ch->pkey, &attr->pkey_index);
1125 pr_err("Translating pkey %#x failed (%d) - using index 0\n",
1128 ret = ib_modify_qp(qp, attr,
1129 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
1137 * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR)
1138 * @ch: channel of the queue pair.
1139 * @qp: queue pair to change the state of.
1141 * Returns zero upon success and a negative value upon failure.
1143 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1144 * If this structure ever becomes larger, it might be necessary to allocate
1145 * it dynamically instead of on the stack.
1147 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1149 struct ib_qp_attr qp_attr;
1153 WARN_ON_ONCE(ch->using_rdma_cm);
1155 qp_attr.qp_state = IB_QPS_RTR;
1156 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
1160 qp_attr.max_dest_rd_atomic = 4;
1162 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1169 * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS)
1170 * @ch: channel of the queue pair.
1171 * @qp: queue pair to change the state of.
1173 * Returns zero upon success and a negative value upon failure.
1175 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1176 * If this structure ever becomes larger, it might be necessary to allocate
1177 * it dynamically instead of on the stack.
1179 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1181 struct ib_qp_attr qp_attr;
1185 qp_attr.qp_state = IB_QPS_RTS;
1186 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
1190 qp_attr.max_rd_atomic = 4;
1192 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1199 * srpt_ch_qp_err - set the channel queue pair state to 'error'
1200 * @ch: SRPT RDMA channel.
1202 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1204 struct ib_qp_attr qp_attr;
1206 qp_attr.qp_state = IB_QPS_ERR;
1207 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1211 * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator
1212 * @ch: SRPT RDMA channel.
1214 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1216 struct srpt_send_ioctx *ioctx;
1221 tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu);
1225 ioctx = ch->ioctx_ring[tag];
1226 BUG_ON(ioctx->ch != ch);
1227 ioctx->state = SRPT_STATE_NEW;
1228 WARN_ON_ONCE(ioctx->recv_ioctx);
1230 ioctx->n_rw_ctx = 0;
1231 ioctx->queue_status_only = false;
1233 * transport_init_se_cmd() does not initialize all fields, so do it
1236 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1237 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1238 ioctx->cmd.map_tag = tag;
1239 ioctx->cmd.map_cpu = cpu;
1245 * srpt_abort_cmd - abort a SCSI command
1246 * @ioctx: I/O context associated with the SCSI command.
1248 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1250 enum srpt_command_state state;
1255 * If the command is in a state where the target core is waiting for
1256 * the ib_srpt driver, change the state to the next state.
1259 state = ioctx->state;
1261 case SRPT_STATE_NEED_DATA:
1262 ioctx->state = SRPT_STATE_DATA_IN;
1264 case SRPT_STATE_CMD_RSP_SENT:
1265 case SRPT_STATE_MGMT_RSP_SENT:
1266 ioctx->state = SRPT_STATE_DONE;
1269 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1274 pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
1275 ioctx->state, ioctx->cmd.tag);
1278 case SRPT_STATE_NEW:
1279 case SRPT_STATE_DATA_IN:
1280 case SRPT_STATE_MGMT:
1281 case SRPT_STATE_DONE:
1283 * Do nothing - defer abort processing until
1284 * srpt_queue_response() is invoked.
1287 case SRPT_STATE_NEED_DATA:
1288 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1289 transport_generic_request_failure(&ioctx->cmd,
1290 TCM_CHECK_CONDITION_ABORT_CMD);
1292 case SRPT_STATE_CMD_RSP_SENT:
1294 * SRP_RSP sending failed or the SRP_RSP send completion has
1295 * not been received in time.
1297 transport_generic_free_cmd(&ioctx->cmd, 0);
1299 case SRPT_STATE_MGMT_RSP_SENT:
1300 transport_generic_free_cmd(&ioctx->cmd, 0);
1303 WARN(1, "Unexpected command state (%d)", state);
1311 * srpt_rdma_read_done - RDMA read completion callback
1312 * @cq: Completion queue.
1313 * @wc: Work completion.
1315 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1316 * the data that has been transferred via IB RDMA had to be postponed until the
1317 * check_stop_free() callback. None of this is necessary anymore and needs to
1320 static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1322 struct srpt_rdma_ch *ch = cq->cq_context;
1323 struct srpt_send_ioctx *ioctx =
1324 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
1326 WARN_ON(ioctx->n_rdma <= 0);
1327 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1330 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1331 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1333 srpt_abort_cmd(ioctx);
1337 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1338 SRPT_STATE_DATA_IN))
1339 target_execute_cmd(&ioctx->cmd);
1341 pr_err("%s[%d]: wrong state = %d\n", __func__,
1342 __LINE__, ioctx->state);
1346 * srpt_build_cmd_rsp - build a SRP_RSP response
1347 * @ch: RDMA channel through which the request has been received.
1348 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1349 * be built in the buffer ioctx->buf points at and hence this function will
1350 * overwrite the request data.
1351 * @tag: tag of the request for which this response is being generated.
1352 * @status: value for the STATUS field of the SRP_RSP information unit.
1354 * Returns the size in bytes of the SRP_RSP response.
1356 * An SRP_RSP response contains a SCSI status or service response. See also
1357 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1358 * response. See also SPC-2 for more information about sense data.
1360 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1361 struct srpt_send_ioctx *ioctx, u64 tag,
1364 struct srp_rsp *srp_rsp;
1365 const u8 *sense_data;
1366 int sense_data_len, max_sense_len;
1369 * The lowest bit of all SAM-3 status codes is zero (see also
1370 * paragraph 5.3 in SAM-3).
1372 WARN_ON(status & 1);
1374 srp_rsp = ioctx->ioctx.buf;
1377 sense_data = ioctx->sense_data;
1378 sense_data_len = ioctx->cmd.scsi_sense_length;
1379 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1381 memset(srp_rsp, 0, sizeof(*srp_rsp));
1382 srp_rsp->opcode = SRP_RSP;
1383 srp_rsp->req_lim_delta =
1384 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1386 srp_rsp->status = status;
1388 if (sense_data_len) {
1389 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1390 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1391 if (sense_data_len > max_sense_len) {
1392 pr_warn("truncated sense data from %d to %d bytes\n",
1393 sense_data_len, max_sense_len);
1394 sense_data_len = max_sense_len;
1397 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1398 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1399 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1402 return sizeof(*srp_rsp) + sense_data_len;
1406 * srpt_build_tskmgmt_rsp - build a task management response
1407 * @ch: RDMA channel through which the request has been received.
1408 * @ioctx: I/O context in which the SRP_RSP response will be built.
1409 * @rsp_code: RSP_CODE that will be stored in the response.
1410 * @tag: Tag of the request for which this response is being generated.
1412 * Returns the size in bytes of the SRP_RSP response.
1414 * An SRP_RSP response contains a SCSI status or service response. See also
1415 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1418 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1419 struct srpt_send_ioctx *ioctx,
1420 u8 rsp_code, u64 tag)
1422 struct srp_rsp *srp_rsp;
1427 resp_len = sizeof(*srp_rsp) + resp_data_len;
1429 srp_rsp = ioctx->ioctx.buf;
1431 memset(srp_rsp, 0, sizeof(*srp_rsp));
1433 srp_rsp->opcode = SRP_RSP;
1434 srp_rsp->req_lim_delta =
1435 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1438 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1439 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1440 srp_rsp->data[3] = rsp_code;
1445 static int srpt_check_stop_free(struct se_cmd *cmd)
1447 struct srpt_send_ioctx *ioctx = container_of(cmd,
1448 struct srpt_send_ioctx, cmd);
1450 return target_put_sess_cmd(&ioctx->cmd);
1454 * srpt_handle_cmd - process a SRP_CMD information unit
1455 * @ch: SRPT RDMA channel.
1456 * @recv_ioctx: Receive I/O context.
1457 * @send_ioctx: Send I/O context.
1459 static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1460 struct srpt_recv_ioctx *recv_ioctx,
1461 struct srpt_send_ioctx *send_ioctx)
1464 struct srp_cmd *srp_cmd;
1465 struct scatterlist *sg = NULL;
1466 unsigned sg_cnt = 0;
1468 enum dma_data_direction dir;
1471 BUG_ON(!send_ioctx);
1473 srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
1474 cmd = &send_ioctx->cmd;
1475 cmd->tag = srp_cmd->tag;
1477 switch (srp_cmd->task_attr) {
1478 case SRP_CMD_SIMPLE_Q:
1479 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1481 case SRP_CMD_ORDERED_Q:
1483 cmd->sam_task_attr = TCM_ORDERED_TAG;
1485 case SRP_CMD_HEAD_OF_Q:
1486 cmd->sam_task_attr = TCM_HEAD_TAG;
1489 cmd->sam_task_attr = TCM_ACA_TAG;
1493 rc = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir,
1494 &sg, &sg_cnt, &data_len, ch->imm_data_offset);
1496 if (rc != -EAGAIN) {
1497 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1503 rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb,
1504 &send_ioctx->sense_data[0],
1505 scsilun_to_int(&srp_cmd->lun), data_len,
1506 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF,
1507 sg, sg_cnt, NULL, 0, NULL, 0);
1509 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1516 target_send_busy(cmd);
1519 static int srp_tmr_to_tcm(int fn)
1522 case SRP_TSK_ABORT_TASK:
1523 return TMR_ABORT_TASK;
1524 case SRP_TSK_ABORT_TASK_SET:
1525 return TMR_ABORT_TASK_SET;
1526 case SRP_TSK_CLEAR_TASK_SET:
1527 return TMR_CLEAR_TASK_SET;
1528 case SRP_TSK_LUN_RESET:
1529 return TMR_LUN_RESET;
1530 case SRP_TSK_CLEAR_ACA:
1531 return TMR_CLEAR_ACA;
1538 * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit
1539 * @ch: SRPT RDMA channel.
1540 * @recv_ioctx: Receive I/O context.
1541 * @send_ioctx: Send I/O context.
1543 * Returns 0 if and only if the request will be processed by the target core.
1545 * For more information about SRP_TSK_MGMT information units, see also section
1546 * 6.7 in the SRP r16a document.
1548 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1549 struct srpt_recv_ioctx *recv_ioctx,
1550 struct srpt_send_ioctx *send_ioctx)
1552 struct srp_tsk_mgmt *srp_tsk;
1554 struct se_session *sess = ch->sess;
1558 BUG_ON(!send_ioctx);
1560 srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
1561 cmd = &send_ioctx->cmd;
1563 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",
1564 srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch,
1567 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1568 send_ioctx->cmd.tag = srp_tsk->tag;
1569 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1570 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1571 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1572 GFP_KERNEL, srp_tsk->task_tag,
1573 TARGET_SCF_ACK_KREF);
1575 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1576 cmd->se_tfo->queue_tm_rsp(cmd);
1582 * srpt_handle_new_iu - process a newly received information unit
1583 * @ch: RDMA channel through which the information unit has been received.
1584 * @recv_ioctx: Receive I/O context associated with the information unit.
1587 srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx)
1589 struct srpt_send_ioctx *send_ioctx = NULL;
1590 struct srp_cmd *srp_cmd;
1595 BUG_ON(!recv_ioctx);
1597 if (unlikely(ch->state == CH_CONNECTING))
1600 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1601 recv_ioctx->ioctx.dma,
1602 recv_ioctx->ioctx.offset + srp_max_req_size,
1605 srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
1606 opcode = srp_cmd->opcode;
1607 if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) {
1608 send_ioctx = srpt_get_send_ioctx(ch);
1609 if (unlikely(!send_ioctx))
1613 if (!list_empty(&recv_ioctx->wait_list)) {
1614 WARN_ON_ONCE(!ch->processing_wait_list);
1615 list_del_init(&recv_ioctx->wait_list);
1620 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1623 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1626 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1629 pr_debug("received SRP_CRED_RSP\n");
1632 pr_debug("received SRP_AER_RSP\n");
1635 pr_err("Received SRP_RSP\n");
1638 pr_err("received IU with unknown opcode 0x%x\n", opcode);
1642 if (!send_ioctx || !send_ioctx->recv_ioctx)
1643 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
1650 if (list_empty(&recv_ioctx->wait_list)) {
1651 WARN_ON_ONCE(ch->processing_wait_list);
1652 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1657 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1659 struct srpt_rdma_ch *ch = cq->cq_context;
1660 struct srpt_recv_ioctx *ioctx =
1661 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
1663 if (wc->status == IB_WC_SUCCESS) {
1666 req_lim = atomic_dec_return(&ch->req_lim);
1667 if (unlikely(req_lim < 0))
1668 pr_err("req_lim = %d < 0\n", req_lim);
1669 ioctx->byte_len = wc->byte_len;
1670 srpt_handle_new_iu(ch, ioctx);
1672 pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",
1678 * This function must be called from the context in which RDMA completions are
1679 * processed because it accesses the wait list without protection against
1680 * access from other threads.
1682 static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
1684 struct srpt_recv_ioctx *recv_ioctx, *tmp;
1686 WARN_ON_ONCE(ch->state == CH_CONNECTING);
1688 if (list_empty(&ch->cmd_wait_list))
1691 WARN_ON_ONCE(ch->processing_wait_list);
1692 ch->processing_wait_list = true;
1693 list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,
1695 if (!srpt_handle_new_iu(ch, recv_ioctx))
1698 ch->processing_wait_list = false;
1702 * srpt_send_done - send completion callback
1703 * @cq: Completion queue.
1704 * @wc: Work completion.
1706 * Note: Although this has not yet been observed during tests, at least in
1707 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1708 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1709 * value in each response is set to one, and it is possible that this response
1710 * makes the initiator send a new request before the send completion for that
1711 * response has been processed. This could e.g. happen if the call to
1712 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1713 * if IB retransmission causes generation of the send completion to be
1714 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1715 * are queued on cmd_wait_list. The code below processes these delayed
1716 * requests one at a time.
1718 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
1720 struct srpt_rdma_ch *ch = cq->cq_context;
1721 struct srpt_send_ioctx *ioctx =
1722 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1723 enum srpt_command_state state;
1725 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1727 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1728 state != SRPT_STATE_MGMT_RSP_SENT);
1730 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
1732 if (wc->status != IB_WC_SUCCESS)
1733 pr_info("sending response for ioctx 0x%p failed with status %d\n",
1736 if (state != SRPT_STATE_DONE) {
1737 transport_generic_free_cmd(&ioctx->cmd, 0);
1739 pr_err("IB completion has been received too late for wr_id = %u.\n",
1740 ioctx->ioctx.index);
1743 srpt_process_wait_list(ch);
1747 * srpt_create_ch_ib - create receive and send completion queues
1748 * @ch: SRPT RDMA channel.
1750 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1752 struct ib_qp_init_attr *qp_init;
1753 struct srpt_port *sport = ch->sport;
1754 struct srpt_device *sdev = sport->sdev;
1755 const struct ib_device_attr *attrs = &sdev->device->attrs;
1756 int sq_size = sport->port_attrib.srp_sq_size;
1759 WARN_ON(ch->rq_size < 1);
1762 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
1767 ch->cq = ib_alloc_cq_any(sdev->device, ch, ch->rq_size + sq_size,
1769 if (IS_ERR(ch->cq)) {
1770 ret = PTR_ERR(ch->cq);
1771 pr_err("failed to create CQ cqe= %d ret= %d\n",
1772 ch->rq_size + sq_size, ret);
1776 qp_init->qp_context = (void *)ch;
1777 qp_init->event_handler
1778 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1779 qp_init->send_cq = ch->cq;
1780 qp_init->recv_cq = ch->cq;
1781 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1782 qp_init->qp_type = IB_QPT_RC;
1784 * We divide up our send queue size into half SEND WRs to send the
1785 * completions, and half R/W contexts to actually do the RDMA
1786 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1787 * both both, as RDMA contexts will also post completions for the
1790 qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr);
1791 qp_init->cap.max_rdma_ctxs = sq_size / 2;
1792 qp_init->cap.max_send_sge = min(attrs->max_send_sge,
1793 SRPT_MAX_SG_PER_WQE);
1794 qp_init->cap.max_recv_sge = min(attrs->max_recv_sge,
1795 SRPT_MAX_SG_PER_WQE);
1796 qp_init->port_num = ch->sport->port;
1797 if (sdev->use_srq) {
1798 qp_init->srq = sdev->srq;
1800 qp_init->cap.max_recv_wr = ch->rq_size;
1801 qp_init->cap.max_recv_sge = min(attrs->max_recv_sge,
1802 SRPT_MAX_SG_PER_WQE);
1805 if (ch->using_rdma_cm) {
1806 ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init);
1807 ch->qp = ch->rdma_cm.cm_id->qp;
1809 ch->qp = ib_create_qp(sdev->pd, qp_init);
1810 if (!IS_ERR(ch->qp)) {
1811 ret = srpt_init_ch_qp(ch, ch->qp);
1813 ib_destroy_qp(ch->qp);
1815 ret = PTR_ERR(ch->qp);
1819 bool retry = sq_size > MIN_SRPT_SQ_SIZE;
1822 pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",
1825 sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE);
1828 pr_err("failed to create queue pair with sq_size = %d (%d)\n",
1830 goto err_destroy_cq;
1834 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1836 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",
1837 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1838 qp_init->cap.max_send_wr, ch);
1841 for (i = 0; i < ch->rq_size; i++)
1842 srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);
1854 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1856 ib_destroy_qp(ch->qp);
1861 * srpt_close_ch - close a RDMA channel
1862 * @ch: SRPT RDMA channel.
1864 * Make sure all resources associated with the channel will be deallocated at
1865 * an appropriate time.
1867 * Returns true if and only if the channel state has been modified into
1870 static bool srpt_close_ch(struct srpt_rdma_ch *ch)
1874 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1875 pr_debug("%s: already closed\n", ch->sess_name);
1879 kref_get(&ch->kref);
1881 ret = srpt_ch_qp_err(ch);
1883 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1884 ch->sess_name, ch->qp->qp_num, ret);
1886 ret = srpt_zerolength_write(ch);
1888 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1889 ch->sess_name, ch->qp->qp_num, ret);
1890 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1891 schedule_work(&ch->release_work);
1896 kref_put(&ch->kref, srpt_free_ch);
1902 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1903 * reached the connected state, close it. If a channel is in the connected
1904 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1905 * the responsibility of the caller to ensure that this function is not
1906 * invoked concurrently with the code that accepts a connection. This means
1907 * that this function must either be invoked from inside a CM callback
1908 * function or that it must be invoked with the srpt_port.mutex held.
1910 static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
1914 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1917 if (ch->using_rdma_cm) {
1918 ret = rdma_disconnect(ch->rdma_cm.cm_id);
1920 ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0);
1922 ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0);
1925 if (ret < 0 && srpt_close_ch(ch))
1931 static bool srpt_ch_closed(struct srpt_port *sport, struct srpt_rdma_ch *ch)
1933 struct srpt_nexus *nexus;
1934 struct srpt_rdma_ch *ch2;
1938 list_for_each_entry(nexus, &sport->nexus_list, entry) {
1939 list_for_each_entry(ch2, &nexus->ch_list, list) {
1952 /* Send DREQ and wait for DREP. */
1953 static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
1955 struct srpt_port *sport = ch->sport;
1957 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
1960 mutex_lock(&sport->mutex);
1961 srpt_disconnect_ch(ch);
1962 mutex_unlock(&sport->mutex);
1964 while (wait_event_timeout(sport->ch_releaseQ, srpt_ch_closed(sport, ch),
1966 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
1967 ch->sess_name, ch->qp->qp_num, ch->state);
1971 static void __srpt_close_all_ch(struct srpt_port *sport)
1973 struct srpt_nexus *nexus;
1974 struct srpt_rdma_ch *ch;
1976 lockdep_assert_held(&sport->mutex);
1978 list_for_each_entry(nexus, &sport->nexus_list, entry) {
1979 list_for_each_entry(ch, &nexus->ch_list, list) {
1980 if (srpt_disconnect_ch(ch) >= 0)
1981 pr_info("Closing channel %s because target %s_%d has been disabled\n",
1983 dev_name(&sport->sdev->device->dev),
1991 * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if
1992 * it does not yet exist.
1994 static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,
1995 const u8 i_port_id[16],
1996 const u8 t_port_id[16])
1998 struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n;
2001 mutex_lock(&sport->mutex);
2002 list_for_each_entry(n, &sport->nexus_list, entry) {
2003 if (memcmp(n->i_port_id, i_port_id, 16) == 0 &&
2004 memcmp(n->t_port_id, t_port_id, 16) == 0) {
2009 if (!nexus && tmp_nexus) {
2010 list_add_tail_rcu(&tmp_nexus->entry,
2011 &sport->nexus_list);
2012 swap(nexus, tmp_nexus);
2014 mutex_unlock(&sport->mutex);
2018 tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
2020 nexus = ERR_PTR(-ENOMEM);
2023 INIT_LIST_HEAD(&tmp_nexus->ch_list);
2024 memcpy(tmp_nexus->i_port_id, i_port_id, 16);
2025 memcpy(tmp_nexus->t_port_id, t_port_id, 16);
2033 static void srpt_set_enabled(struct srpt_port *sport, bool enabled)
2034 __must_hold(&sport->mutex)
2036 lockdep_assert_held(&sport->mutex);
2038 if (sport->enabled == enabled)
2040 sport->enabled = enabled;
2042 __srpt_close_all_ch(sport);
2045 static void srpt_free_ch(struct kref *kref)
2047 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
2053 * Shut down the SCSI target session, tell the connection manager to
2054 * disconnect the associated RDMA channel, transition the QP to the error
2055 * state and remove the channel from the channel list. This function is
2056 * typically called from inside srpt_zerolength_write_done(). Concurrent
2057 * srpt_zerolength_write() calls from inside srpt_close_ch() are possible
2058 * as long as the channel is on sport->nexus_list.
2060 static void srpt_release_channel_work(struct work_struct *w)
2062 struct srpt_rdma_ch *ch;
2063 struct srpt_device *sdev;
2064 struct srpt_port *sport;
2065 struct se_session *se_sess;
2067 ch = container_of(w, struct srpt_rdma_ch, release_work);
2068 pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num);
2070 sdev = ch->sport->sdev;
2076 target_sess_cmd_list_set_waiting(se_sess);
2077 target_wait_for_sess_cmds(se_sess);
2079 target_remove_session(se_sess);
2082 if (ch->using_rdma_cm)
2083 rdma_destroy_id(ch->rdma_cm.cm_id);
2085 ib_destroy_cm_id(ch->ib_cm.cm_id);
2088 mutex_lock(&sport->mutex);
2089 list_del_rcu(&ch->list);
2090 mutex_unlock(&sport->mutex);
2092 srpt_destroy_ch_ib(ch);
2094 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2095 ch->sport->sdev, ch->rq_size,
2096 ch->rsp_buf_cache, DMA_TO_DEVICE);
2098 kmem_cache_destroy(ch->rsp_buf_cache);
2100 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
2102 ch->req_buf_cache, DMA_FROM_DEVICE);
2104 kmem_cache_destroy(ch->req_buf_cache);
2106 wake_up(&sport->ch_releaseQ);
2108 kref_put(&ch->kref, srpt_free_ch);
2112 * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED
2113 * @sdev: HCA through which the login request was received.
2114 * @ib_cm_id: IB/CM connection identifier in case of IB/CM.
2115 * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM.
2116 * @port_num: Port through which the REQ message was received.
2117 * @pkey: P_Key of the incoming connection.
2118 * @req: SRP login request.
2119 * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted
2120 * the login request.
2122 * Ownership of the cm_id is transferred to the target session if this
2123 * function returns zero. Otherwise the caller remains the owner of cm_id.
2125 static int srpt_cm_req_recv(struct srpt_device *const sdev,
2126 struct ib_cm_id *ib_cm_id,
2127 struct rdma_cm_id *rdma_cm_id,
2128 u8 port_num, __be16 pkey,
2129 const struct srp_login_req *req,
2130 const char *src_addr)
2132 struct srpt_port *sport = &sdev->port[port_num - 1];
2133 struct srpt_nexus *nexus;
2134 struct srp_login_rsp *rsp = NULL;
2135 struct srp_login_rej *rej = NULL;
2137 struct rdma_conn_param rdma_cm;
2138 struct ib_cm_rep_param ib_cm;
2139 } *rep_param = NULL;
2140 struct srpt_rdma_ch *ch = NULL;
2143 int i, tag_num, tag_size, ret;
2145 WARN_ON_ONCE(irqs_disabled());
2147 if (WARN_ON(!sdev || !req))
2150 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2152 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",
2153 req->initiator_port_id, req->target_port_id, it_iu_len,
2154 port_num, &sport->gid, be16_to_cpu(pkey));
2156 nexus = srpt_get_nexus(sport, req->initiator_port_id,
2157 req->target_port_id);
2158 if (IS_ERR(nexus)) {
2159 ret = PTR_ERR(nexus);
2164 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
2165 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
2166 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
2167 if (!rsp || !rej || !rep_param)
2171 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2172 rej->reason = cpu_to_be32(
2173 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2174 pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",
2175 it_iu_len, 64, srp_max_req_size);
2179 if (!sport->enabled) {
2180 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2181 pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",
2182 dev_name(&sport->sdev->device->dev), port_num);
2186 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2187 || *(__be64 *)(req->target_port_id + 8) !=
2188 cpu_to_be64(srpt_service_guid)) {
2189 rej->reason = cpu_to_be32(
2190 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2191 pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");
2196 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
2198 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2199 pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");
2203 kref_init(&ch->kref);
2204 ch->pkey = be16_to_cpu(pkey);
2206 ch->zw_cqe.done = srpt_zerolength_write_done;
2207 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2210 ch->ib_cm.cm_id = ib_cm_id;
2211 ib_cm_id->context = ch;
2213 ch->using_rdma_cm = true;
2214 ch->rdma_cm.cm_id = rdma_cm_id;
2215 rdma_cm_id->context = ch;
2218 * ch->rq_size should be at least as large as the initiator queue
2219 * depth to avoid that the initiator driver has to report QUEUE_FULL
2220 * to the SCSI mid-layer.
2222 ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);
2223 spin_lock_init(&ch->spinlock);
2224 ch->state = CH_CONNECTING;
2225 INIT_LIST_HEAD(&ch->cmd_wait_list);
2226 ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2228 ch->rsp_buf_cache = kmem_cache_create("srpt-rsp-buf", ch->max_rsp_size,
2230 if (!ch->rsp_buf_cache)
2233 ch->ioctx_ring = (struct srpt_send_ioctx **)
2234 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2235 sizeof(*ch->ioctx_ring[0]),
2236 ch->rsp_buf_cache, 0, DMA_TO_DEVICE);
2237 if (!ch->ioctx_ring) {
2238 pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");
2239 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2240 goto free_rsp_cache;
2243 for (i = 0; i < ch->rq_size; i++)
2244 ch->ioctx_ring[i]->ch = ch;
2245 if (!sdev->use_srq) {
2246 u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ?
2247 be16_to_cpu(req->imm_data_offset) : 0;
2248 u16 alignment_offset;
2251 if (req->req_flags & SRP_IMMED_REQUESTED)
2252 pr_debug("imm_data_offset = %d\n",
2253 be16_to_cpu(req->imm_data_offset));
2254 if (imm_data_offset >= sizeof(struct srp_cmd)) {
2255 ch->imm_data_offset = imm_data_offset;
2256 rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP;
2258 ch->imm_data_offset = 0;
2260 alignment_offset = round_up(imm_data_offset, 512) -
2262 req_sz = alignment_offset + imm_data_offset + srp_max_req_size;
2263 ch->req_buf_cache = kmem_cache_create("srpt-req-buf", req_sz,
2265 if (!ch->req_buf_cache)
2268 ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)
2269 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2270 sizeof(*ch->ioctx_recv_ring[0]),
2274 if (!ch->ioctx_recv_ring) {
2275 pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
2277 cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2278 goto free_recv_cache;
2280 for (i = 0; i < ch->rq_size; i++)
2281 INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list);
2284 ret = srpt_create_ch_ib(ch);
2286 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2287 pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");
2288 goto free_recv_ring;
2291 strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name));
2292 snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx",
2293 be64_to_cpu(*(__be64 *)nexus->i_port_id),
2294 be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8)));
2296 pr_debug("registering session %s\n", ch->sess_name);
2298 tag_num = ch->rq_size;
2299 tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */
2300 if (sport->port_guid_tpg.se_tpg_wwn)
2301 ch->sess = target_setup_session(&sport->port_guid_tpg, tag_num,
2302 tag_size, TARGET_PROT_NORMAL,
2303 ch->sess_name, ch, NULL);
2304 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2305 ch->sess = target_setup_session(&sport->port_gid_tpg, tag_num,
2306 tag_size, TARGET_PROT_NORMAL, i_port_id,
2308 /* Retry without leading "0x" */
2309 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2310 ch->sess = target_setup_session(&sport->port_gid_tpg, tag_num,
2311 tag_size, TARGET_PROT_NORMAL,
2312 i_port_id + 2, ch, NULL);
2313 if (IS_ERR_OR_NULL(ch->sess)) {
2314 WARN_ON_ONCE(ch->sess == NULL);
2315 ret = PTR_ERR(ch->sess);
2317 pr_info("Rejected login for initiator %s: ret = %d.\n",
2318 ch->sess_name, ret);
2319 rej->reason = cpu_to_be32(ret == -ENOMEM ?
2320 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
2321 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2325 mutex_lock(&sport->mutex);
2327 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2328 struct srpt_rdma_ch *ch2;
2330 list_for_each_entry(ch2, &nexus->ch_list, list) {
2331 if (srpt_disconnect_ch(ch2) < 0)
2333 pr_info("Relogin - closed existing channel %s\n",
2335 rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2338 rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2341 list_add_tail_rcu(&ch->list, &nexus->ch_list);
2343 if (!sport->enabled) {
2344 rej->reason = cpu_to_be32(
2345 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2346 pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",
2347 dev_name(&sdev->device->dev), port_num);
2348 mutex_unlock(&sport->mutex);
2352 mutex_unlock(&sport->mutex);
2354 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp);
2356 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2357 pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",
2362 pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess,
2365 /* create srp_login_response */
2366 rsp->opcode = SRP_LOGIN_RSP;
2367 rsp->tag = req->tag;
2368 rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size);
2369 rsp->max_ti_iu_len = req->req_it_iu_len;
2370 ch->max_ti_iu_len = it_iu_len;
2371 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2372 SRP_BUF_FORMAT_INDIRECT);
2373 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2374 atomic_set(&ch->req_lim, ch->rq_size);
2375 atomic_set(&ch->req_lim_delta, 0);
2377 /* create cm reply */
2378 if (ch->using_rdma_cm) {
2379 rep_param->rdma_cm.private_data = (void *)rsp;
2380 rep_param->rdma_cm.private_data_len = sizeof(*rsp);
2381 rep_param->rdma_cm.rnr_retry_count = 7;
2382 rep_param->rdma_cm.flow_control = 1;
2383 rep_param->rdma_cm.responder_resources = 4;
2384 rep_param->rdma_cm.initiator_depth = 4;
2386 rep_param->ib_cm.qp_num = ch->qp->qp_num;
2387 rep_param->ib_cm.private_data = (void *)rsp;
2388 rep_param->ib_cm.private_data_len = sizeof(*rsp);
2389 rep_param->ib_cm.rnr_retry_count = 7;
2390 rep_param->ib_cm.flow_control = 1;
2391 rep_param->ib_cm.failover_accepted = 0;
2392 rep_param->ib_cm.srq = 1;
2393 rep_param->ib_cm.responder_resources = 4;
2394 rep_param->ib_cm.initiator_depth = 4;
2398 * Hold the sport mutex while accepting a connection to avoid that
2399 * srpt_disconnect_ch() is invoked concurrently with this code.
2401 mutex_lock(&sport->mutex);
2402 if (sport->enabled && ch->state == CH_CONNECTING) {
2403 if (ch->using_rdma_cm)
2404 ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm);
2406 ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm);
2410 mutex_unlock(&sport->mutex);
2418 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2419 pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",
2427 srpt_destroy_ch_ib(ch);
2430 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
2431 ch->sport->sdev, ch->rq_size,
2432 ch->req_buf_cache, DMA_FROM_DEVICE);
2435 kmem_cache_destroy(ch->req_buf_cache);
2438 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2439 ch->sport->sdev, ch->rq_size,
2440 ch->rsp_buf_cache, DMA_TO_DEVICE);
2443 kmem_cache_destroy(ch->rsp_buf_cache);
2447 rdma_cm_id->context = NULL;
2449 ib_cm_id->context = NULL;
2453 WARN_ON_ONCE(ret == 0);
2456 pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason));
2457 rej->opcode = SRP_LOGIN_REJ;
2458 rej->tag = req->tag;
2459 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2460 SRP_BUF_FORMAT_INDIRECT);
2463 rdma_reject(rdma_cm_id, rej, sizeof(*rej));
2465 ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2468 if (ch && ch->sess) {
2471 * Tell the caller not to free cm_id since
2472 * srpt_release_channel_work() will do that.
2485 static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,
2486 const struct ib_cm_req_event_param *param,
2491 srpt_format_guid(sguid, sizeof(sguid),
2492 ¶m->primary_path->dgid.global.interface_id);
2494 return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port,
2495 param->primary_path->pkey,
2496 private_data, sguid);
2499 static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id,
2500 struct rdma_cm_event *event)
2502 struct srpt_device *sdev;
2503 struct srp_login_req req;
2504 const struct srp_login_req_rdma *req_rdma;
2505 struct sa_path_rec *path_rec = cm_id->route.path_rec;
2508 sdev = ib_get_client_data(cm_id->device, &srpt_client);
2510 return -ECONNREFUSED;
2512 if (event->param.conn.private_data_len < sizeof(*req_rdma))
2515 /* Transform srp_login_req_rdma into srp_login_req. */
2516 req_rdma = event->param.conn.private_data;
2517 memset(&req, 0, sizeof(req));
2518 req.opcode = req_rdma->opcode;
2519 req.tag = req_rdma->tag;
2520 req.req_it_iu_len = req_rdma->req_it_iu_len;
2521 req.req_buf_fmt = req_rdma->req_buf_fmt;
2522 req.req_flags = req_rdma->req_flags;
2523 memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16);
2524 memcpy(req.target_port_id, req_rdma->target_port_id, 16);
2525 req.imm_data_offset = req_rdma->imm_data_offset;
2527 snprintf(src_addr, sizeof(src_addr), "%pIS",
2528 &cm_id->route.addr.src_addr);
2530 return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num,
2531 path_rec ? path_rec->pkey : 0, &req, src_addr);
2534 static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2535 enum ib_cm_rej_reason reason,
2536 const u8 *private_data,
2537 u8 private_data_len)
2542 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2544 for (i = 0; i < private_data_len; i++)
2545 sprintf(priv + 3 * i, " %02x", private_data[i]);
2547 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2548 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2549 "; private data" : "", priv ? priv : " (?)");
2554 * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event
2555 * @ch: SRPT RDMA channel.
2557 * An RTU (ready to use) message indicates that the connection has been
2558 * established and that the recipient may begin transmitting.
2560 static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
2564 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp);
2566 pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name,
2573 * Note: calling srpt_close_ch() if the transition to the LIVE state
2574 * fails is not necessary since that means that that function has
2575 * already been invoked from another thread.
2577 if (!srpt_set_ch_state(ch, CH_LIVE)) {
2578 pr_err("%s-%d: channel transition to LIVE state failed\n",
2579 ch->sess_name, ch->qp->qp_num);
2583 /* Trigger wait list processing. */
2584 ret = srpt_zerolength_write(ch);
2585 WARN_ONCE(ret < 0, "%d\n", ret);
2589 * srpt_cm_handler - IB connection manager callback function
2590 * @cm_id: IB/CM connection identifier.
2591 * @event: IB/CM event.
2593 * A non-zero return value will cause the caller destroy the CM ID.
2595 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2596 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2597 * a non-zero value in any other case will trigger a race with the
2598 * ib_destroy_cm_id() call in srpt_release_channel().
2600 static int srpt_cm_handler(struct ib_cm_id *cm_id,
2601 const struct ib_cm_event *event)
2603 struct srpt_rdma_ch *ch = cm_id->context;
2607 switch (event->event) {
2608 case IB_CM_REQ_RECEIVED:
2609 ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd,
2610 event->private_data);
2612 case IB_CM_REJ_RECEIVED:
2613 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2614 event->private_data,
2615 IB_CM_REJ_PRIVATE_DATA_SIZE);
2617 case IB_CM_RTU_RECEIVED:
2618 case IB_CM_USER_ESTABLISHED:
2619 srpt_cm_rtu_recv(ch);
2621 case IB_CM_DREQ_RECEIVED:
2622 srpt_disconnect_ch(ch);
2624 case IB_CM_DREP_RECEIVED:
2625 pr_info("Received CM DREP message for ch %s-%d.\n",
2626 ch->sess_name, ch->qp->qp_num);
2629 case IB_CM_TIMEWAIT_EXIT:
2630 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2631 ch->sess_name, ch->qp->qp_num);
2634 case IB_CM_REP_ERROR:
2635 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2638 case IB_CM_DREQ_ERROR:
2639 pr_info("Received CM DREQ ERROR event.\n");
2641 case IB_CM_MRA_RECEIVED:
2642 pr_info("Received CM MRA event\n");
2645 pr_err("received unrecognized CM event %d\n", event->event);
2652 static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id,
2653 struct rdma_cm_event *event)
2655 struct srpt_rdma_ch *ch = cm_id->context;
2658 switch (event->event) {
2659 case RDMA_CM_EVENT_CONNECT_REQUEST:
2660 ret = srpt_rdma_cm_req_recv(cm_id, event);
2662 case RDMA_CM_EVENT_REJECTED:
2663 srpt_cm_rej_recv(ch, event->status,
2664 event->param.conn.private_data,
2665 event->param.conn.private_data_len);
2667 case RDMA_CM_EVENT_ESTABLISHED:
2668 srpt_cm_rtu_recv(ch);
2670 case RDMA_CM_EVENT_DISCONNECTED:
2671 if (ch->state < CH_DISCONNECTING)
2672 srpt_disconnect_ch(ch);
2676 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2679 case RDMA_CM_EVENT_UNREACHABLE:
2680 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2683 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2684 case RDMA_CM_EVENT_ADDR_CHANGE:
2687 pr_err("received unrecognized RDMA CM event %d\n",
2696 * srpt_write_pending - Start data transfer from initiator to target (write).
2698 static int srpt_write_pending(struct se_cmd *se_cmd)
2700 struct srpt_send_ioctx *ioctx =
2701 container_of(se_cmd, struct srpt_send_ioctx, cmd);
2702 struct srpt_rdma_ch *ch = ioctx->ch;
2703 struct ib_send_wr *first_wr = NULL;
2704 struct ib_cqe *cqe = &ioctx->rdma_cqe;
2705 enum srpt_command_state new_state;
2708 if (ioctx->recv_ioctx) {
2709 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2710 target_execute_cmd(&ioctx->cmd);
2714 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2715 WARN_ON(new_state == SRPT_STATE_DONE);
2717 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
2718 pr_warn("%s: IB send queue full (needed %d)\n",
2719 __func__, ioctx->n_rdma);
2724 cqe->done = srpt_rdma_read_done;
2725 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2726 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2728 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
2733 ret = ib_post_send(ch->qp, first_wr, NULL);
2735 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2736 __func__, ret, ioctx->n_rdma,
2737 atomic_read(&ch->sq_wr_avail));
2743 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
2747 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2749 switch (tcm_mgmt_status) {
2750 case TMR_FUNCTION_COMPLETE:
2751 return SRP_TSK_MGMT_SUCCESS;
2752 case TMR_FUNCTION_REJECTED:
2753 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2755 return SRP_TSK_MGMT_FAILED;
2759 * srpt_queue_response - transmit the response to a SCSI command
2760 * @cmd: SCSI target command.
2762 * Callback function called by the TCM core. Must not block since it can be
2763 * invoked on the context of the IB completion handler.
2765 static void srpt_queue_response(struct se_cmd *cmd)
2767 struct srpt_send_ioctx *ioctx =
2768 container_of(cmd, struct srpt_send_ioctx, cmd);
2769 struct srpt_rdma_ch *ch = ioctx->ch;
2770 struct srpt_device *sdev = ch->sport->sdev;
2771 struct ib_send_wr send_wr, *first_wr = &send_wr;
2773 enum srpt_command_state state;
2774 int resp_len, ret, i;
2779 state = ioctx->state;
2781 case SRPT_STATE_NEW:
2782 case SRPT_STATE_DATA_IN:
2783 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2785 case SRPT_STATE_MGMT:
2786 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2789 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2790 ch, ioctx->ioctx.index, ioctx->state);
2794 if (WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))
2797 /* For read commands, transfer the data to the initiator. */
2798 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
2799 ioctx->cmd.data_length &&
2800 !ioctx->queue_status_only) {
2801 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2802 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2804 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
2805 ch->sport->port, NULL, first_wr);
2809 if (state != SRPT_STATE_MGMT)
2810 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
2814 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2815 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
2819 atomic_inc(&ch->req_lim);
2821 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
2822 &ch->sq_wr_avail) < 0)) {
2823 pr_warn("%s: IB send queue full (needed %d)\n",
2824 __func__, ioctx->n_rdma);
2829 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
2832 sge.addr = ioctx->ioctx.dma;
2833 sge.length = resp_len;
2834 sge.lkey = sdev->lkey;
2836 ioctx->ioctx.cqe.done = srpt_send_done;
2837 send_wr.next = NULL;
2838 send_wr.wr_cqe = &ioctx->ioctx.cqe;
2839 send_wr.sg_list = &sge;
2840 send_wr.num_sge = 1;
2841 send_wr.opcode = IB_WR_SEND;
2842 send_wr.send_flags = IB_SEND_SIGNALED;
2844 ret = ib_post_send(ch->qp, first_wr, NULL);
2846 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2847 __func__, ioctx->cmd.tag, ret);
2854 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
2855 atomic_dec(&ch->req_lim);
2856 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
2857 target_put_sess_cmd(&ioctx->cmd);
2860 static int srpt_queue_data_in(struct se_cmd *cmd)
2862 srpt_queue_response(cmd);
2866 static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2868 srpt_queue_response(cmd);
2872 * This function is called for aborted commands if no response is sent to the
2873 * initiator. Make sure that the credits freed by aborting a command are
2874 * returned to the initiator the next time a response is sent by incrementing
2875 * ch->req_lim_delta.
2877 static void srpt_aborted_task(struct se_cmd *cmd)
2879 struct srpt_send_ioctx *ioctx = container_of(cmd,
2880 struct srpt_send_ioctx, cmd);
2881 struct srpt_rdma_ch *ch = ioctx->ch;
2883 atomic_inc(&ch->req_lim_delta);
2886 static int srpt_queue_status(struct se_cmd *cmd)
2888 struct srpt_send_ioctx *ioctx;
2890 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2891 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2892 if (cmd->se_cmd_flags &
2893 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2894 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2895 ioctx->queue_status_only = true;
2896 srpt_queue_response(cmd);
2900 static void srpt_refresh_port_work(struct work_struct *work)
2902 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2904 srpt_refresh_port(sport);
2907 static bool srpt_ch_list_empty(struct srpt_port *sport)
2909 struct srpt_nexus *nexus;
2913 list_for_each_entry(nexus, &sport->nexus_list, entry)
2914 if (!list_empty(&nexus->ch_list))
2922 * srpt_release_sport - disable login and wait for associated channels
2923 * @sport: SRPT HCA port.
2925 static int srpt_release_sport(struct srpt_port *sport)
2927 struct srpt_nexus *nexus, *next_n;
2928 struct srpt_rdma_ch *ch;
2930 WARN_ON_ONCE(irqs_disabled());
2932 mutex_lock(&sport->mutex);
2933 srpt_set_enabled(sport, false);
2934 mutex_unlock(&sport->mutex);
2936 while (wait_event_timeout(sport->ch_releaseQ,
2937 srpt_ch_list_empty(sport), 5 * HZ) <= 0) {
2938 pr_info("%s_%d: waiting for session unregistration ...\n",
2939 dev_name(&sport->sdev->device->dev), sport->port);
2941 list_for_each_entry(nexus, &sport->nexus_list, entry) {
2942 list_for_each_entry(ch, &nexus->ch_list, list) {
2943 pr_info("%s-%d: state %s\n",
2944 ch->sess_name, ch->qp->qp_num,
2945 get_ch_state_name(ch->state));
2951 mutex_lock(&sport->mutex);
2952 list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) {
2953 list_del(&nexus->entry);
2954 kfree_rcu(nexus, rcu);
2956 mutex_unlock(&sport->mutex);
2961 static struct se_wwn *__srpt_lookup_wwn(const char *name)
2963 struct ib_device *dev;
2964 struct srpt_device *sdev;
2965 struct srpt_port *sport;
2968 list_for_each_entry(sdev, &srpt_dev_list, list) {
2973 for (i = 0; i < dev->phys_port_cnt; i++) {
2974 sport = &sdev->port[i];
2976 if (strcmp(sport->port_guid, name) == 0)
2977 return &sport->port_guid_wwn;
2978 if (strcmp(sport->port_gid, name) == 0)
2979 return &sport->port_gid_wwn;
2986 static struct se_wwn *srpt_lookup_wwn(const char *name)
2990 spin_lock(&srpt_dev_lock);
2991 wwn = __srpt_lookup_wwn(name);
2992 spin_unlock(&srpt_dev_lock);
2997 static void srpt_free_srq(struct srpt_device *sdev)
3002 ib_destroy_srq(sdev->srq);
3003 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3004 sdev->srq_size, sdev->req_buf_cache,
3006 kmem_cache_destroy(sdev->req_buf_cache);
3010 static int srpt_alloc_srq(struct srpt_device *sdev)
3012 struct ib_srq_init_attr srq_attr = {
3013 .event_handler = srpt_srq_event,
3014 .srq_context = (void *)sdev,
3015 .attr.max_wr = sdev->srq_size,
3017 .srq_type = IB_SRQT_BASIC,
3019 struct ib_device *device = sdev->device;
3023 WARN_ON_ONCE(sdev->srq);
3024 srq = ib_create_srq(sdev->pd, &srq_attr);
3026 pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
3027 return PTR_ERR(srq);
3030 pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
3031 sdev->device->attrs.max_srq_wr, dev_name(&device->dev));
3033 sdev->req_buf_cache = kmem_cache_create("srpt-srq-req-buf",
3034 srp_max_req_size, 0, 0, NULL);
3035 if (!sdev->req_buf_cache)
3038 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
3039 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
3040 sizeof(*sdev->ioctx_ring[0]),
3041 sdev->req_buf_cache, 0, DMA_FROM_DEVICE);
3042 if (!sdev->ioctx_ring)
3045 sdev->use_srq = true;
3048 for (i = 0; i < sdev->srq_size; ++i) {
3049 INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list);
3050 srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
3056 kmem_cache_destroy(sdev->req_buf_cache);
3059 ib_destroy_srq(srq);
3063 static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
3065 struct ib_device *device = sdev->device;
3069 srpt_free_srq(sdev);
3070 sdev->use_srq = false;
3071 } else if (use_srq && !sdev->srq) {
3072 ret = srpt_alloc_srq(sdev);
3074 pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__,
3075 dev_name(&device->dev), sdev->use_srq, ret);
3080 * srpt_add_one - InfiniBand device addition callback function
3081 * @device: Describes a HCA.
3083 static void srpt_add_one(struct ib_device *device)
3085 struct srpt_device *sdev;
3086 struct srpt_port *sport;
3089 pr_debug("device = %p\n", device);
3091 sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt),
3096 sdev->device = device;
3097 mutex_init(&sdev->sdev_mutex);
3099 sdev->pd = ib_alloc_pd(device, 0);
3100 if (IS_ERR(sdev->pd))
3103 sdev->lkey = sdev->pd->local_dma_lkey;
3105 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
3107 srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
3109 if (!srpt_service_guid)
3110 srpt_service_guid = be64_to_cpu(device->node_guid);
3112 if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)
3113 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3114 if (IS_ERR(sdev->cm_id)) {
3115 pr_info("ib_create_cm_id() failed: %ld\n",
3116 PTR_ERR(sdev->cm_id));
3122 /* print out target login information */
3123 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n",
3124 srpt_service_guid, srpt_service_guid, srpt_service_guid);
3127 * We do not have a consistent service_id (ie. also id_ext of target_id)
3128 * to identify this target. We currently use the guid of the first HCA
3129 * in the system as service_id; therefore, the target_id will change
3130 * if this HCA is gone bad and replaced by different HCA
3133 ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0) :
3136 pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret,
3137 sdev->cm_id->state);
3141 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3142 srpt_event_handler);
3143 ib_register_event_handler(&sdev->event_handler);
3145 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3146 sport = &sdev->port[i - 1];
3147 INIT_LIST_HEAD(&sport->nexus_list);
3148 init_waitqueue_head(&sport->ch_releaseQ);
3149 mutex_init(&sport->mutex);
3152 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3153 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3154 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3155 sport->port_attrib.use_srq = false;
3156 INIT_WORK(&sport->work, srpt_refresh_port_work);
3158 if (srpt_refresh_port(sport)) {
3159 pr_err("MAD registration failed for %s-%d.\n",
3160 dev_name(&sdev->device->dev), i);
3165 spin_lock(&srpt_dev_lock);
3166 list_add_tail(&sdev->list, &srpt_dev_list);
3167 spin_unlock(&srpt_dev_lock);
3170 ib_set_client_data(device, &srpt_client, sdev);
3171 pr_debug("added %s.\n", dev_name(&device->dev));
3175 ib_unregister_event_handler(&sdev->event_handler);
3178 ib_destroy_cm_id(sdev->cm_id);
3180 srpt_free_srq(sdev);
3181 ib_dealloc_pd(sdev->pd);
3186 pr_info("%s(%s) failed.\n", __func__, dev_name(&device->dev));
3191 * srpt_remove_one - InfiniBand device removal callback function
3192 * @device: Describes a HCA.
3193 * @client_data: The value passed as the third argument to ib_set_client_data().
3195 static void srpt_remove_one(struct ib_device *device, void *client_data)
3197 struct srpt_device *sdev = client_data;
3201 pr_info("%s(%s): nothing to do.\n", __func__,
3202 dev_name(&device->dev));
3206 srpt_unregister_mad_agent(sdev);
3208 ib_unregister_event_handler(&sdev->event_handler);
3210 /* Cancel any work queued by the just unregistered IB event handler. */
3211 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3212 cancel_work_sync(&sdev->port[i].work);
3215 ib_destroy_cm_id(sdev->cm_id);
3217 ib_set_client_data(device, &srpt_client, NULL);
3220 * Unregistering a target must happen after destroying sdev->cm_id
3221 * such that no new SRP_LOGIN_REQ information units can arrive while
3222 * destroying the target.
3224 spin_lock(&srpt_dev_lock);
3225 list_del(&sdev->list);
3226 spin_unlock(&srpt_dev_lock);
3228 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3229 srpt_release_sport(&sdev->port[i]);
3231 srpt_free_srq(sdev);
3233 ib_dealloc_pd(sdev->pd);
3238 static struct ib_client srpt_client = {
3240 .add = srpt_add_one,
3241 .remove = srpt_remove_one
3244 static int srpt_check_true(struct se_portal_group *se_tpg)
3249 static int srpt_check_false(struct se_portal_group *se_tpg)
3254 static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)
3256 return tpg->se_tpg_wwn->priv;
3259 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3261 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
3263 WARN_ON_ONCE(tpg != &sport->port_guid_tpg &&
3264 tpg != &sport->port_gid_tpg);
3265 return tpg == &sport->port_guid_tpg ? sport->port_guid :
3269 static u16 srpt_get_tag(struct se_portal_group *tpg)
3274 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3279 static void srpt_release_cmd(struct se_cmd *se_cmd)
3281 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
3282 struct srpt_send_ioctx, cmd);
3283 struct srpt_rdma_ch *ch = ioctx->ch;
3284 struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx;
3286 WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
3287 !(ioctx->cmd.transport_state & CMD_T_ABORTED));
3290 WARN_ON_ONCE(!list_empty(&recv_ioctx->wait_list));
3291 ioctx->recv_ioctx = NULL;
3292 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
3295 if (ioctx->n_rw_ctx) {
3296 srpt_free_rw_ctxs(ch, ioctx);
3297 ioctx->n_rw_ctx = 0;
3300 target_free_tag(se_cmd->se_sess, se_cmd);
3304 * srpt_close_session - forcibly close a session
3305 * @se_sess: SCSI target session.
3307 * Callback function invoked by the TCM core to clean up sessions associated
3308 * with a node ACL when the user invokes
3309 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3311 static void srpt_close_session(struct se_session *se_sess)
3313 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
3315 srpt_disconnect_ch_sync(ch);
3319 * srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB)
3320 * @se_sess: SCSI target session.
3322 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3323 * This object represents an arbitrary integer used to uniquely identify a
3324 * particular attached remote initiator port to a particular SCSI target port
3325 * within a particular SCSI target device within a particular SCSI instance.
3327 static u32 srpt_sess_get_index(struct se_session *se_sess)
3332 static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3336 /* Note: only used from inside debug printk's by the TCM core. */
3337 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3339 struct srpt_send_ioctx *ioctx;
3341 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3342 return ioctx->state;
3345 static int srpt_parse_guid(u64 *guid, const char *name)
3350 if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)
3352 *guid = get_unaligned_be64(w);
3359 * srpt_parse_i_port_id - parse an initiator port ID
3360 * @name: ASCII representation of a 128-bit initiator port ID.
3361 * @i_port_id: Binary 128-bit port ID.
3363 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3366 unsigned len, count, leading_zero_bytes;
3370 if (strncasecmp(p, "0x", 2) == 0)
3376 count = min(len / 2, 16U);
3377 leading_zero_bytes = 16 - count;
3378 memset(i_port_id, 0, leading_zero_bytes);
3379 ret = hex2bin(i_port_id + leading_zero_bytes, p, count);
3386 * configfs callback function invoked for mkdir
3387 * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3389 * i_port_id must be an initiator port GUID, GID or IP address. See also the
3390 * target_alloc_session() calls in this driver. Examples of valid initiator
3392 * 0x0000000000000000505400fffe4a0b7b
3393 * 0000000000000000505400fffe4a0b7b
3394 * 5054:00ff:fe4a:0b7b
3397 static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
3399 struct sockaddr_storage sa;
3404 ret = srpt_parse_guid(&guid, name);
3406 ret = srpt_parse_i_port_id(i_port_id, name);
3408 ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL,
3411 pr_err("invalid initiator port ID %s\n", name);
3415 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
3418 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3419 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3421 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3424 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
3425 const char *page, size_t count)
3427 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3428 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3432 ret = kstrtoul(page, 0, &val);
3434 pr_err("kstrtoul() failed with ret: %d\n", ret);
3437 if (val > MAX_SRPT_RDMA_SIZE) {
3438 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3439 MAX_SRPT_RDMA_SIZE);
3442 if (val < DEFAULT_MAX_RDMA_SIZE) {
3443 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3444 val, DEFAULT_MAX_RDMA_SIZE);
3447 sport->port_attrib.srp_max_rdma_size = val;
3452 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
3455 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3456 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3458 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3461 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
3462 const char *page, size_t count)
3464 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3465 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3469 ret = kstrtoul(page, 0, &val);
3471 pr_err("kstrtoul() failed with ret: %d\n", ret);
3474 if (val > MAX_SRPT_RSP_SIZE) {
3475 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3479 if (val < MIN_MAX_RSP_SIZE) {
3480 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3484 sport->port_attrib.srp_max_rsp_size = val;
3489 static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
3492 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3493 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3495 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3498 static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
3499 const char *page, size_t count)
3501 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3502 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3506 ret = kstrtoul(page, 0, &val);
3508 pr_err("kstrtoul() failed with ret: %d\n", ret);
3511 if (val > MAX_SRPT_SRQ_SIZE) {
3512 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3516 if (val < MIN_SRPT_SRQ_SIZE) {
3517 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3521 sport->port_attrib.srp_sq_size = val;
3526 static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,
3529 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3530 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3532 return sprintf(page, "%d\n", sport->port_attrib.use_srq);
3535 static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,
3536 const char *page, size_t count)
3538 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3539 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3540 struct srpt_device *sdev = sport->sdev;
3545 ret = kstrtoul(page, 0, &val);
3551 ret = mutex_lock_interruptible(&sdev->sdev_mutex);
3554 ret = mutex_lock_interruptible(&sport->mutex);
3557 enabled = sport->enabled;
3558 /* Log out all initiator systems before changing 'use_srq'. */
3559 srpt_set_enabled(sport, false);
3560 sport->port_attrib.use_srq = val;
3561 srpt_use_srq(sdev, sport->port_attrib.use_srq);
3562 srpt_set_enabled(sport, enabled);
3564 mutex_unlock(&sport->mutex);
3566 mutex_unlock(&sdev->sdev_mutex);
3571 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
3572 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
3573 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
3574 CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);
3576 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3577 &srpt_tpg_attrib_attr_srp_max_rdma_size,
3578 &srpt_tpg_attrib_attr_srp_max_rsp_size,
3579 &srpt_tpg_attrib_attr_srp_sq_size,
3580 &srpt_tpg_attrib_attr_use_srq,
3584 static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr)
3586 struct rdma_cm_id *rdma_cm_id;
3589 rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler,
3590 NULL, RDMA_PS_TCP, IB_QPT_RC);
3591 if (IS_ERR(rdma_cm_id)) {
3592 pr_err("RDMA/CM ID creation failed: %ld\n",
3593 PTR_ERR(rdma_cm_id));
3597 ret = rdma_bind_addr(rdma_cm_id, listen_addr);
3601 snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr);
3602 pr_err("Binding RDMA/CM ID to address %s failed: %d\n",
3604 rdma_destroy_id(rdma_cm_id);
3605 rdma_cm_id = ERR_PTR(ret);
3609 ret = rdma_listen(rdma_cm_id, 128);
3611 pr_err("rdma_listen() failed: %d\n", ret);
3612 rdma_destroy_id(rdma_cm_id);
3613 rdma_cm_id = ERR_PTR(ret);
3620 static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page)
3622 return sprintf(page, "%d\n", rdma_cm_port);
3625 static ssize_t srpt_rdma_cm_port_store(struct config_item *item,
3626 const char *page, size_t count)
3628 struct sockaddr_in addr4 = { .sin_family = AF_INET };
3629 struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 };
3630 struct rdma_cm_id *new_id = NULL;
3634 ret = kstrtou16(page, 0, &val);
3638 if (rdma_cm_port == val)
3642 addr6.sin6_port = cpu_to_be16(val);
3643 new_id = srpt_create_rdma_id((struct sockaddr *)&addr6);
3644 if (IS_ERR(new_id)) {
3645 addr4.sin_port = cpu_to_be16(val);
3646 new_id = srpt_create_rdma_id((struct sockaddr *)&addr4);
3647 if (IS_ERR(new_id)) {
3648 ret = PTR_ERR(new_id);
3654 mutex_lock(&rdma_cm_mutex);
3656 swap(rdma_cm_id, new_id);
3657 mutex_unlock(&rdma_cm_mutex);
3660 rdma_destroy_id(new_id);
3666 CONFIGFS_ATTR(srpt_, rdma_cm_port);
3668 static struct configfs_attribute *srpt_da_attrs[] = {
3669 &srpt_attr_rdma_cm_port,
3673 static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
3675 struct se_portal_group *se_tpg = to_tpg(item);
3676 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3678 return snprintf(page, PAGE_SIZE, "%d\n", sport->enabled);
3681 static ssize_t srpt_tpg_enable_store(struct config_item *item,
3682 const char *page, size_t count)
3684 struct se_portal_group *se_tpg = to_tpg(item);
3685 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3689 ret = kstrtoul(page, 0, &tmp);
3691 pr_err("Unable to extract srpt_tpg_store_enable\n");
3695 if ((tmp != 0) && (tmp != 1)) {
3696 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3700 mutex_lock(&sport->mutex);
3701 srpt_set_enabled(sport, tmp);
3702 mutex_unlock(&sport->mutex);
3707 CONFIGFS_ATTR(srpt_tpg_, enable);
3709 static struct configfs_attribute *srpt_tpg_attrs[] = {
3710 &srpt_tpg_attr_enable,
3715 * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg
3716 * @wwn: Corresponds to $driver/$port.
3719 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3722 struct srpt_port *sport = wwn->priv;
3723 struct se_portal_group *tpg;
3726 WARN_ON_ONCE(wwn != &sport->port_guid_wwn &&
3727 wwn != &sport->port_gid_wwn);
3728 tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg :
3729 &sport->port_gid_tpg;
3730 res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP);
3732 return ERR_PTR(res);
3738 * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg
3739 * @tpg: Target portal group to deregister.
3741 static void srpt_drop_tpg(struct se_portal_group *tpg)
3743 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
3745 sport->enabled = false;
3746 core_tpg_deregister(tpg);
3750 * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port
3755 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3756 struct config_group *group,
3759 return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL);
3763 * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port
3766 static void srpt_drop_tport(struct se_wwn *wwn)
3770 static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
3772 return scnprintf(buf, PAGE_SIZE, "\n");
3775 CONFIGFS_ATTR_RO(srpt_wwn_, version);
3777 static struct configfs_attribute *srpt_wwn_attrs[] = {
3778 &srpt_wwn_attr_version,
3782 static const struct target_core_fabric_ops srpt_template = {
3783 .module = THIS_MODULE,
3784 .fabric_name = "srpt",
3785 .tpg_get_wwn = srpt_get_fabric_wwn,
3786 .tpg_get_tag = srpt_get_tag,
3787 .tpg_check_demo_mode = srpt_check_false,
3788 .tpg_check_demo_mode_cache = srpt_check_true,
3789 .tpg_check_demo_mode_write_protect = srpt_check_true,
3790 .tpg_check_prod_mode_write_protect = srpt_check_false,
3791 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3792 .release_cmd = srpt_release_cmd,
3793 .check_stop_free = srpt_check_stop_free,
3794 .close_session = srpt_close_session,
3795 .sess_get_index = srpt_sess_get_index,
3796 .sess_get_initiator_sid = NULL,
3797 .write_pending = srpt_write_pending,
3798 .set_default_node_attributes = srpt_set_default_node_attrs,
3799 .get_cmd_state = srpt_get_tcm_cmd_state,
3800 .queue_data_in = srpt_queue_data_in,
3801 .queue_status = srpt_queue_status,
3802 .queue_tm_rsp = srpt_queue_tm_rsp,
3803 .aborted_task = srpt_aborted_task,
3805 * Setup function pointers for generic logic in
3806 * target_core_fabric_configfs.c
3808 .fabric_make_wwn = srpt_make_tport,
3809 .fabric_drop_wwn = srpt_drop_tport,
3810 .fabric_make_tpg = srpt_make_tpg,
3811 .fabric_drop_tpg = srpt_drop_tpg,
3812 .fabric_init_nodeacl = srpt_init_nodeacl,
3814 .tfc_discovery_attrs = srpt_da_attrs,
3815 .tfc_wwn_attrs = srpt_wwn_attrs,
3816 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3817 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3821 * srpt_init_module - kernel module initialization
3823 * Note: Since ib_register_client() registers callback functions, and since at
3824 * least one of these callback functions (srpt_add_one()) calls target core
3825 * functions, this driver must be registered with the target core before
3826 * ib_register_client() is called.
3828 static int __init srpt_init_module(void)
3833 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3834 pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n",
3835 srp_max_req_size, MIN_MAX_REQ_SIZE);
3839 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3840 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3841 pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n",
3842 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3846 ret = target_register_template(&srpt_template);
3850 ret = ib_register_client(&srpt_client);
3852 pr_err("couldn't register IB client\n");
3853 goto out_unregister_target;
3858 out_unregister_target:
3859 target_unregister_template(&srpt_template);
3864 static void __exit srpt_cleanup_module(void)
3867 rdma_destroy_id(rdma_cm_id);
3868 ib_unregister_client(&srpt_client);
3869 target_unregister_template(&srpt_template);
3872 module_init(srpt_init_module);
3873 module_exit(srpt_cleanup_module);