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IB/mad: Add dev_notice messages for various umad/mad registration failures
[linux-2.6-block.git] / drivers / infiniband / ulp / srpt / ib_srpt.c
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a42d985b
BVA		 1/*
2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
4 *
5 * This software is available to you under a choice of one of 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:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
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.
23 *
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
31 * SOFTWARE.
32 *
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/ctype.h>
40#include <linux/kthread.h>
41#include <linux/string.h>
42#include <linux/delay.h>
43#include <linux/atomic.h>
44#include <scsi/scsi_tcq.h>
45#include <target/configfs_macros.h>
46#include <target/target_core_base.h>
47#include <target/target_core_fabric_configfs.h>
48#include <target/target_core_fabric.h>
49#include <target/target_core_configfs.h>
50#include "ib_srpt.h"
51
52/* Name of this kernel module. */
53#define DRV_NAME "ib_srpt"
54#define DRV_VERSION "2.0.0"
55#define DRV_RELDATE "2011-02-14"
56
57#define SRPT_ID_STRING "Linux SRP target"
58
59#undef pr_fmt
60#define pr_fmt(fmt) DRV_NAME " " fmt
61
62MODULE_AUTHOR("Vu Pham and Bart Van Assche");
63MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
64 "v" DRV_VERSION " (" DRV_RELDATE ")");
65MODULE_LICENSE("Dual BSD/GPL");
66
67/*
68 * Global Variables
69 */
70
71static u64 srpt_service_guid;
486d8b9f
RD		 72static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
73static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
a42d985b
BVA		 74
75static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
76module_param(srp_max_req_size, int, 0444);
77MODULE_PARM_DESC(srp_max_req_size,
78 "Maximum size of SRP request messages in bytes.");
79
80static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
81module_param(srpt_srq_size, int, 0444);
82MODULE_PARM_DESC(srpt_srq_size,
83 "Shared receive queue (SRQ) size.");
84
85static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
86{
87 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
88}
89module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
90 0444);
91MODULE_PARM_DESC(srpt_service_guid,
92 "Using this value for ioc_guid, id_ext, and cm_listen_id"
93 " instead of using the node_guid of the first HCA.");
94
95static struct ib_client srpt_client;
96static struct target_fabric_configfs *srpt_target;
97static void srpt_release_channel(struct srpt_rdma_ch *ch);
98static int srpt_queue_status(struct se_cmd *cmd);
99
100/**
101 * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
102 */
103static inline
104enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir)
105{
106 switch (dir) {
107 case DMA_TO_DEVICE: return DMA_FROM_DEVICE;
108 case DMA_FROM_DEVICE: return DMA_TO_DEVICE;
109 default: return dir;
110 }
111}
112
113/**
114 * srpt_sdev_name() - Return the name associated with the HCA.
115 *
116 * Examples are ib0, ib1, ...
117 */
118static inline const char *srpt_sdev_name(struct srpt_device *sdev)
119{
120 return sdev->device->name;
121}
122
123static enum rdma_ch_state srpt_get_ch_state(struct srpt_rdma_ch *ch)
124{
125 unsigned long flags;
126 enum rdma_ch_state state;
127
128 spin_lock_irqsave(&ch->spinlock, flags);
129 state = ch->state;
130 spin_unlock_irqrestore(&ch->spinlock, flags);
131 return state;
132}
133
134static enum rdma_ch_state
135srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state)
136{
137 unsigned long flags;
138 enum rdma_ch_state prev;
139
140 spin_lock_irqsave(&ch->spinlock, flags);
141 prev = ch->state;
142 ch->state = new_state;
143 spin_unlock_irqrestore(&ch->spinlock, flags);
144 return prev;
145}
146
147/**
148 * srpt_test_and_set_ch_state() - Test and set the channel state.
149 *
150 * Returns true if and only if the channel state has been set to the new state.
151 */
152static bool
153srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old,
154 enum rdma_ch_state new)
155{
156 unsigned long flags;
157 enum rdma_ch_state prev;
158
159 spin_lock_irqsave(&ch->spinlock, flags);
160 prev = ch->state;
161 if (prev == old)
162 ch->state = new;
163 spin_unlock_irqrestore(&ch->spinlock, flags);
164 return prev == old;
165}
166
167/**
168 * srpt_event_handler() - Asynchronous IB event callback function.
169 *
170 * Callback function called by the InfiniBand core when an asynchronous IB
171 * event occurs. This callback may occur in interrupt context. See also
172 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
173 * Architecture Specification.
174 */
175static void srpt_event_handler(struct ib_event_handler *handler,
176 struct ib_event *event)
177{
178 struct srpt_device *sdev;
179 struct srpt_port *sport;
180
181 sdev = ib_get_client_data(event->device, &srpt_client);
182 if (!sdev || sdev->device != event->device)
183 return;
184
185 pr_debug("ASYNC event= %d on device= %s\n", event->event,
186 srpt_sdev_name(sdev));
187
188 switch (event->event) {
189 case IB_EVENT_PORT_ERR:
190 if (event->element.port_num <= sdev->device->phys_port_cnt) {
191 sport = &sdev->port[event->element.port_num - 1];
192 sport->lid = 0;
193 sport->sm_lid = 0;
194 }
195 break;
196 case IB_EVENT_PORT_ACTIVE:
197 case IB_EVENT_LID_CHANGE:
198 case IB_EVENT_PKEY_CHANGE:
199 case IB_EVENT_SM_CHANGE:
200 case IB_EVENT_CLIENT_REREGISTER:
201 /* Refresh port data asynchronously. */
202 if (event->element.port_num <= sdev->device->phys_port_cnt) {
203 sport = &sdev->port[event->element.port_num - 1];
204 if (!sport->lid && !sport->sm_lid)
205 schedule_work(&sport->work);
206 }
207 break;
208 default:
209 printk(KERN_ERR "received unrecognized IB event %d\n",
210 event->event);
211 break;
212 }
213}
214
215/**
216 * srpt_srq_event() - SRQ event callback function.
217 */
218static void srpt_srq_event(struct ib_event *event, void *ctx)
219{
220 printk(KERN_INFO "SRQ event %d\n", event->event);
221}
222
223/**
224 * srpt_qp_event() - QP event callback function.
225 */
226static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
227{
228 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
229 event->event, ch->cm_id, ch->sess_name, srpt_get_ch_state(ch));
230
231 switch (event->event) {
232 case IB_EVENT_COMM_EST:
233 ib_cm_notify(ch->cm_id, event->event);
234 break;
235 case IB_EVENT_QP_LAST_WQE_REACHED:
236 if (srpt_test_and_set_ch_state(ch, CH_DRAINING,
237 CH_RELEASING))
238 srpt_release_channel(ch);
239 else
240 pr_debug("%s: state %d - ignored LAST_WQE.\n",
241 ch->sess_name, srpt_get_ch_state(ch));
242 break;
243 default:
244 printk(KERN_ERR "received unrecognized IB QP event %d\n",
245 event->event);
246 break;
247 }
248}
249
250/**
251 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
252 *
253 * @slot: one-based slot number.
254 * @value: four-bit value.
255 *
256 * Copies the lowest four bits of value in element slot of the array of four
257 * bit elements called c_list (controller list). The index slot is one-based.
258 */
259static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
260{
261 u16 id;
262 u8 tmp;
263
264 id = (slot - 1) / 2;
265 if (slot & 0x1) {
266 tmp = c_list[id] & 0xf;
267 c_list[id] = (value << 4) | tmp;
268 } else {
269 tmp = c_list[id] & 0xf0;
270 c_list[id] = (value & 0xf) | tmp;
271 }
272}
273
274/**
275 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
276 *
277 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
278 * Specification.
279 */
280static void srpt_get_class_port_info(struct ib_dm_mad *mad)
281{
282 struct ib_class_port_info *cif;
283
284 cif = (struct ib_class_port_info *)mad->data;
285 memset(cif, 0, sizeof *cif);
286 cif->base_version = 1;
287 cif->class_version = 1;
288 cif->resp_time_value = 20;
289
290 mad->mad_hdr.status = 0;
291}
292
293/**
294 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
295 *
296 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
297 * Specification. See also section B.7, table B.6 in the SRP r16a document.
298 */
299static void srpt_get_iou(struct ib_dm_mad *mad)
300{
301 struct ib_dm_iou_info *ioui;
302 u8 slot;
303 int i;
304
305 ioui = (struct ib_dm_iou_info *)mad->data;
306 ioui->change_id = __constant_cpu_to_be16(1);
307 ioui->max_controllers = 16;
308
309 /* set present for slot 1 and empty for the rest */
310 srpt_set_ioc(ioui->controller_list, 1, 1);
311 for (i = 1, slot = 2; i < 16; i++, slot++)
312 srpt_set_ioc(ioui->controller_list, slot, 0);
313
314 mad->mad_hdr.status = 0;
315}
316
317/**
318 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
319 *
320 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
321 * Architecture Specification. See also section B.7, table B.7 in the SRP
322 * r16a document.
323 */
324static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
325 struct ib_dm_mad *mad)
326{
327 struct srpt_device *sdev = sport->sdev;
328 struct ib_dm_ioc_profile *iocp;
329
330 iocp = (struct ib_dm_ioc_profile *)mad->data;
331
332 if (!slot || slot > 16) {
333 mad->mad_hdr.status
334 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
335 return;
336 }
337
338 if (slot > 2) {
339 mad->mad_hdr.status
340 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
341 return;
342 }
343
344 memset(iocp, 0, sizeof *iocp);
345 strcpy(iocp->id_string, SRPT_ID_STRING);
346 iocp->guid = cpu_to_be64(srpt_service_guid);
347 iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
348 iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
349 iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
350 iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
351 iocp->subsys_device_id = 0x0;
352 iocp->io_class = __constant_cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
353 iocp->io_subclass = __constant_cpu_to_be16(SRP_IO_SUBCLASS);
354 iocp->protocol = __constant_cpu_to_be16(SRP_PROTOCOL);
355 iocp->protocol_version = __constant_cpu_to_be16(SRP_PROTOCOL_VERSION);
356 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
357 iocp->rdma_read_depth = 4;
358 iocp->send_size = cpu_to_be32(srp_max_req_size);
359 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
360 1U << 24));
361 iocp->num_svc_entries = 1;
362 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
363 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
364
365 mad->mad_hdr.status = 0;
366}
367
368/**
369 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
370 *
371 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
372 * Specification. See also section B.7, table B.8 in the SRP r16a document.
373 */
374static void srpt_get_svc_entries(u64 ioc_guid,
375 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
376{
377 struct ib_dm_svc_entries *svc_entries;
378
379 WARN_ON(!ioc_guid);
380
381 if (!slot || slot > 16) {
382 mad->mad_hdr.status
383 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
384 return;
385 }
386
387 if (slot > 2 || lo > hi || hi > 1) {
388 mad->mad_hdr.status
389 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
390 return;
391 }
392
393 svc_entries = (struct ib_dm_svc_entries *)mad->data;
394 memset(svc_entries, 0, sizeof *svc_entries);
395 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
396 snprintf(svc_entries->service_entries[0].name,
397 sizeof(svc_entries->service_entries[0].name),
398 "%s%016llx",
399 SRP_SERVICE_NAME_PREFIX,
400 ioc_guid);
401
402 mad->mad_hdr.status = 0;
403}
404
405/**
406 * srpt_mgmt_method_get() - Process a received management datagram.
407 * @sp: source port through which the MAD has been received.
408 * @rq_mad: received MAD.
409 * @rsp_mad: response MAD.
410 */
411static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
412 struct ib_dm_mad *rsp_mad)
413{
414 u16 attr_id;
415 u32 slot;
416 u8 hi, lo;
417
418 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
419 switch (attr_id) {
420 case DM_ATTR_CLASS_PORT_INFO:
421 srpt_get_class_port_info(rsp_mad);
422 break;
423 case DM_ATTR_IOU_INFO:
424 srpt_get_iou(rsp_mad);
425 break;
426 case DM_ATTR_IOC_PROFILE:
427 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
428 srpt_get_ioc(sp, slot, rsp_mad);
429 break;
430 case DM_ATTR_SVC_ENTRIES:
431 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
432 hi = (u8) ((slot >> 8) & 0xff);
433 lo = (u8) (slot & 0xff);
434 slot = (u16) ((slot >> 16) & 0xffff);
435 srpt_get_svc_entries(srpt_service_guid,
436 slot, hi, lo, rsp_mad);
437 break;
438 default:
439 rsp_mad->mad_hdr.status =
440 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
441 break;
442 }
443}
444
445/**
446 * srpt_mad_send_handler() - Post MAD-send callback function.
447 */
448static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
449 struct ib_mad_send_wc *mad_wc)
450{
451 ib_destroy_ah(mad_wc->send_buf->ah);
452 ib_free_send_mad(mad_wc->send_buf);
453}
454
455/**
456 * srpt_mad_recv_handler() - MAD reception callback function.
457 */
458static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
459 struct ib_mad_recv_wc *mad_wc)
460{
461 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
462 struct ib_ah *ah;
463 struct ib_mad_send_buf *rsp;
464 struct ib_dm_mad *dm_mad;
465
466 if (!mad_wc || !mad_wc->recv_buf.mad)
467 return;
468
469 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
470 mad_wc->recv_buf.grh, mad_agent->port_num);
471 if (IS_ERR(ah))
472 goto err;
473
474 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
475
476 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
477 mad_wc->wc->pkey_index, 0,
478 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
479 GFP_KERNEL);
480 if (IS_ERR(rsp))
481 goto err_rsp;
482
483 rsp->ah = ah;
484
485 dm_mad = rsp->mad;
486 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad);
487 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
488 dm_mad->mad_hdr.status = 0;
489
490 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
491 case IB_MGMT_METHOD_GET:
492 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
493 break;
494 case IB_MGMT_METHOD_SET:
495 dm_mad->mad_hdr.status =
496 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
497 break;
498 default:
499 dm_mad->mad_hdr.status =
500 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
501 break;
502 }
503
504 if (!ib_post_send_mad(rsp, NULL)) {
505 ib_free_recv_mad(mad_wc);
506 /* will destroy_ah & free_send_mad in send completion */
507 return;
508 }
509
510 ib_free_send_mad(rsp);
511
512err_rsp:
513 ib_destroy_ah(ah);
514err:
515 ib_free_recv_mad(mad_wc);
516}
517
518/**
519 * srpt_refresh_port() - Configure a HCA port.
520 *
521 * Enable InfiniBand management datagram processing, update the cached sm_lid,
522 * lid and gid values, and register a callback function for processing MADs
523 * on the specified port.
524 *
525 * Note: It is safe to call this function more than once for the same port.
526 */
527static int srpt_refresh_port(struct srpt_port *sport)
528{
529 struct ib_mad_reg_req reg_req;
530 struct ib_port_modify port_modify;
531 struct ib_port_attr port_attr;
532 int ret;
533
534 memset(&port_modify, 0, sizeof port_modify);
535 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
536 port_modify.clr_port_cap_mask = 0;
537
538 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
539 if (ret)
540 goto err_mod_port;
541
542 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
543 if (ret)
544 goto err_query_port;
545
546 sport->sm_lid = port_attr.sm_lid;
547 sport->lid = port_attr.lid;
548
549 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
550 if (ret)
551 goto err_query_port;
552
553 if (!sport->mad_agent) {
554 memset(&reg_req, 0, sizeof reg_req);
555 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
556 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
557 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
558 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
559
560 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
561 sport->port,
562 IB_QPT_GSI,
563 &reg_req, 0,
564 srpt_mad_send_handler,
565 srpt_mad_recv_handler,
566 sport);
567 if (IS_ERR(sport->mad_agent)) {
568 ret = PTR_ERR(sport->mad_agent);
569 sport->mad_agent = NULL;
570 goto err_query_port;
571 }
572 }
573
574 return 0;
575
576err_query_port:
577
578 port_modify.set_port_cap_mask = 0;
579 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
580 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
581
582err_mod_port:
583
584 return ret;
585}
586
587/**
588 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
589 *
590 * Note: It is safe to call this function more than once for the same device.
591 */
592static void srpt_unregister_mad_agent(struct srpt_device *sdev)
593{
594 struct ib_port_modify port_modify = {
595 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
596 };
597 struct srpt_port *sport;
598 int i;
599
600 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
601 sport = &sdev->port[i - 1];
602 WARN_ON(sport->port != i);
603 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
604 printk(KERN_ERR "disabling MAD processing failed.\n");
605 if (sport->mad_agent) {
606 ib_unregister_mad_agent(sport->mad_agent);
607 sport->mad_agent = NULL;
608 }
609 }
610}
611
612/**
613 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
614 */
615static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
616 int ioctx_size, int dma_size,
617 enum dma_data_direction dir)
618{
619 struct srpt_ioctx *ioctx;
620
621 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
622 if (!ioctx)
623 goto err;
624
625 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
626 if (!ioctx->buf)
627 goto err_free_ioctx;
628
629 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
630 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
631 goto err_free_buf;
632
633 return ioctx;
634
635err_free_buf:
636 kfree(ioctx->buf);
637err_free_ioctx:
638 kfree(ioctx);
639err:
640 return NULL;
641}
642
643/**
644 * srpt_free_ioctx() - Free an SRPT I/O context structure.
645 */
646static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
647 int dma_size, enum dma_data_direction dir)
648{
649 if (!ioctx)
650 return;
651
652 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
653 kfree(ioctx->buf);
654 kfree(ioctx);
655}
656
657/**
658 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
659 * @sdev: Device to allocate the I/O context ring for.
660 * @ring_size: Number of elements in the I/O context ring.
661 * @ioctx_size: I/O context size.
662 * @dma_size: DMA buffer size.
663 * @dir: DMA data direction.
664 */
665static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
666 int ring_size, int ioctx_size,
667 int dma_size, enum dma_data_direction dir)
668{
669 struct srpt_ioctx **ring;
670 int i;
671
672 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
673 && ioctx_size != sizeof(struct srpt_send_ioctx));
674
675 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
676 if (!ring)
677 goto out;
678 for (i = 0; i < ring_size; ++i) {
679 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
680 if (!ring[i])
681 goto err;
682 ring[i]->index = i;
683 }
684 goto out;
685
686err:
687 while (--i >= 0)
688 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
689 kfree(ring);
715252d4 690 ring = NULL;
a42d985b
BVA		 691out:
692 return ring;
693}
694
695/**
696 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
697 */
698static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
699 struct srpt_device *sdev, int ring_size,
700 int dma_size, enum dma_data_direction dir)
701{
702 int i;
703
704 for (i = 0; i < ring_size; ++i)
705 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
706 kfree(ioctx_ring);
707}
708
709/**
710 * srpt_get_cmd_state() - Get the state of a SCSI command.
711 */
712static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
713{
714 enum srpt_command_state state;
715 unsigned long flags;
716
717 BUG_ON(!ioctx);
718
719 spin_lock_irqsave(&ioctx->spinlock, flags);
720 state = ioctx->state;
721 spin_unlock_irqrestore(&ioctx->spinlock, flags);
722 return state;
723}
724
725/**
726 * srpt_set_cmd_state() - Set the state of a SCSI command.
727 *
728 * Does not modify the state of aborted commands. Returns the previous command
729 * state.
730 */
731static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
732 enum srpt_command_state new)
733{
734 enum srpt_command_state previous;
735 unsigned long flags;
736
737 BUG_ON(!ioctx);
738
739 spin_lock_irqsave(&ioctx->spinlock, flags);
740 previous = ioctx->state;
741 if (previous != SRPT_STATE_DONE)
742 ioctx->state = new;
743 spin_unlock_irqrestore(&ioctx->spinlock, flags);
744
745 return previous;
746}
747
748/**
749 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
750 *
751 * Returns true if and only if the previous command state was equal to 'old'.
752 */
753static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
754 enum srpt_command_state old,
755 enum srpt_command_state new)
756{
757 enum srpt_command_state previous;
758 unsigned long flags;
759
760 WARN_ON(!ioctx);
761 WARN_ON(old == SRPT_STATE_DONE);
762 WARN_ON(new == SRPT_STATE_NEW);
763
764 spin_lock_irqsave(&ioctx->spinlock, flags);
765 previous = ioctx->state;
766 if (previous == old)
767 ioctx->state = new;
768 spin_unlock_irqrestore(&ioctx->spinlock, flags);
769 return previous == old;
770}
771
772/**
773 * srpt_post_recv() - Post an IB receive request.
774 */
775static int srpt_post_recv(struct srpt_device *sdev,
776 struct srpt_recv_ioctx *ioctx)
777{
778 struct ib_sge list;
779 struct ib_recv_wr wr, *bad_wr;
780
781 BUG_ON(!sdev);
782 wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
783
784 list.addr = ioctx->ioctx.dma;
785 list.length = srp_max_req_size;
786 list.lkey = sdev->mr->lkey;
787
788 wr.next = NULL;
789 wr.sg_list = &list;
790 wr.num_sge = 1;
791
792 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
793}
794
795/**
796 * srpt_post_send() - Post an IB send request.
797 *
798 * Returns zero upon success and a non-zero value upon failure.
799 */
800static int srpt_post_send(struct srpt_rdma_ch *ch,
801 struct srpt_send_ioctx *ioctx, int len)
802{
803 struct ib_sge list;
804 struct ib_send_wr wr, *bad_wr;
805 struct srpt_device *sdev = ch->sport->sdev;
806 int ret;
807
808 atomic_inc(&ch->req_lim);
809
810 ret = -ENOMEM;
811 if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) {
812 printk(KERN_WARNING "IB send queue full (needed 1)\n");
813 goto out;
814 }
815
816 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
817 DMA_TO_DEVICE);
818
819 list.addr = ioctx->ioctx.dma;
820 list.length = len;
821 list.lkey = sdev->mr->lkey;
822
823 wr.next = NULL;
824 wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
825 wr.sg_list = &list;
826 wr.num_sge = 1;
827 wr.opcode = IB_WR_SEND;
828 wr.send_flags = IB_SEND_SIGNALED;
829
830 ret = ib_post_send(ch->qp, &wr, &bad_wr);
831
832out:
833 if (ret < 0) {
834 atomic_inc(&ch->sq_wr_avail);
835 atomic_dec(&ch->req_lim);
836 }
837 return ret;
838}
839
840/**
841 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
842 * @ioctx: Pointer to the I/O context associated with the request.
843 * @srp_cmd: Pointer to the SRP_CMD request data.
844 * @dir: Pointer to the variable to which the transfer direction will be
845 * written.
846 * @data_len: Pointer to the variable to which the total data length of all
847 * descriptors in the SRP_CMD request will be written.
848 *
849 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
850 *
851 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
852 * -ENOMEM when memory allocation fails and zero upon success.
853 */
854static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
855 struct srp_cmd *srp_cmd,
856 enum dma_data_direction *dir, u64 *data_len)
857{
858 struct srp_indirect_buf *idb;
859 struct srp_direct_buf *db;
860 unsigned add_cdb_offset;
861 int ret;
862
863 /*
864 * The pointer computations below will only be compiled correctly
865 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
866 * whether srp_cmd::add_data has been declared as a byte pointer.
867 */
868 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
869 && !__same_type(srp_cmd->add_data[0], (u8)0));
870
871 BUG_ON(!dir);
872 BUG_ON(!data_len);
873
874 ret = 0;
875 *data_len = 0;
876
877 /*
878 * The lower four bits of the buffer format field contain the DATA-IN
879 * buffer descriptor format, and the highest four bits contain the
880 * DATA-OUT buffer descriptor format.
881 */
882 *dir = DMA_NONE;
883 if (srp_cmd->buf_fmt & 0xf)
884 /* DATA-IN: transfer data from target to initiator (read). */
885 *dir = DMA_FROM_DEVICE;
886 else if (srp_cmd->buf_fmt >> 4)
887 /* DATA-OUT: transfer data from initiator to target (write). */
888 *dir = DMA_TO_DEVICE;
889
890 /*
891 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
892 * CDB LENGTH' field are reserved and the size in bytes of this field
893 * is four times the value specified in bits 3..7. Hence the "& ~3".
894 */
895 add_cdb_offset = srp_cmd->add_cdb_len & ~3;
896 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
897 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
898 ioctx->n_rbuf = 1;
899 ioctx->rbufs = &ioctx->single_rbuf;
900
901 db = (struct srp_direct_buf *)(srp_cmd->add_data
902 + add_cdb_offset);
903 memcpy(ioctx->rbufs, db, sizeof *db);
904 *data_len = be32_to_cpu(db->len);
905 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
906 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
907 idb = (struct srp_indirect_buf *)(srp_cmd->add_data
908 + add_cdb_offset);
909
910 ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db;
911
912 if (ioctx->n_rbuf >
913 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
914 printk(KERN_ERR "received unsupported SRP_CMD request"
915 " type (%u out + %u in != %u / %zu)\n",
916 srp_cmd->data_out_desc_cnt,
917 srp_cmd->data_in_desc_cnt,
918 be32_to_cpu(idb->table_desc.len),
919 sizeof(*db));
920 ioctx->n_rbuf = 0;
921 ret = -EINVAL;
922 goto out;
923 }
924
925 if (ioctx->n_rbuf == 1)
926 ioctx->rbufs = &ioctx->single_rbuf;
927 else {
928 ioctx->rbufs =
929 kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC);
930 if (!ioctx->rbufs) {
931 ioctx->n_rbuf = 0;
932 ret = -ENOMEM;
933 goto out;
934 }
935 }
936
937 db = idb->desc_list;
938 memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
939 *data_len = be32_to_cpu(idb->len);
940 }
941out:
942 return ret;
943}
944
945/**
946 * srpt_init_ch_qp() - Initialize queue pair attributes.
947 *
948 * Initialized the attributes of queue pair 'qp' by allowing local write,
949 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
950 */
951static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
952{
953 struct ib_qp_attr *attr;
954 int ret;
955
956 attr = kzalloc(sizeof *attr, GFP_KERNEL);
957 if (!attr)
958 return -ENOMEM;
959
960 attr->qp_state = IB_QPS_INIT;
961 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
962 IB_ACCESS_REMOTE_WRITE;
963 attr->port_num = ch->sport->port;
964 attr->pkey_index = 0;
965
966 ret = ib_modify_qp(qp, attr,
967 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
968 IB_QP_PKEY_INDEX);
969
970 kfree(attr);
971 return ret;
972}
973
974/**
975 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
976 * @ch: channel of the queue pair.
977 * @qp: queue pair to change the state of.
978 *
979 * Returns zero upon success and a negative value upon failure.
980 *
981 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
982 * If this structure ever becomes larger, it might be necessary to allocate
983 * it dynamically instead of on the stack.
984 */
985static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
986{
987 struct ib_qp_attr qp_attr;
988 int attr_mask;
989 int ret;
990
991 qp_attr.qp_state = IB_QPS_RTR;
992 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
993 if (ret)
994 goto out;
995
996 qp_attr.max_dest_rd_atomic = 4;
997
998 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
999
1000out:
1001 return ret;
1002}
1003
1004/**
1005 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1006 * @ch: channel of the queue pair.
1007 * @qp: queue pair to change the state of.
1008 *
1009 * Returns zero upon success and a negative value upon failure.
1010 *
1011 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1012 * If this structure ever becomes larger, it might be necessary to allocate
1013 * it dynamically instead of on the stack.
1014 */
1015static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1016{
1017 struct ib_qp_attr qp_attr;
1018 int attr_mask;
1019 int ret;
1020
1021 qp_attr.qp_state = IB_QPS_RTS;
1022 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1023 if (ret)
1024 goto out;
1025
1026 qp_attr.max_rd_atomic = 4;
1027
1028 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1029
1030out:
1031 return ret;
1032}
1033
1034/**
1035 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1036 */
1037static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1038{
1039 struct ib_qp_attr qp_attr;
1040
1041 qp_attr.qp_state = IB_QPS_ERR;
1042 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1043}
1044
1045/**
1046 * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
1047 */
1048static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1049 struct srpt_send_ioctx *ioctx)
1050{
1051 struct scatterlist *sg;
1052 enum dma_data_direction dir;
1053
1054 BUG_ON(!ch);
1055 BUG_ON(!ioctx);
1056 BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
1057
1058 while (ioctx->n_rdma)
1059 kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge);
1060
1061 kfree(ioctx->rdma_ius);
1062 ioctx->rdma_ius = NULL;
1063
1064 if (ioctx->mapped_sg_count) {
1065 sg = ioctx->sg;
1066 WARN_ON(!sg);
1067 dir = ioctx->cmd.data_direction;
1068 BUG_ON(dir == DMA_NONE);
1069 ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
1070 opposite_dma_dir(dir));
1071 ioctx->mapped_sg_count = 0;
1072 }
1073}
1074
1075/**
1076 * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
1077 */
1078static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1079 struct srpt_send_ioctx *ioctx)
1080{
b0768080 1081 struct ib_device *dev = ch->sport->sdev->device;
a42d985b
BVA		 1082 struct se_cmd *cmd;
1083 struct scatterlist *sg, *sg_orig;
1084 int sg_cnt;
1085 enum dma_data_direction dir;
1086 struct rdma_iu *riu;
1087 struct srp_direct_buf *db;
1088 dma_addr_t dma_addr;
1089 struct ib_sge *sge;
1090 u64 raddr;
1091 u32 rsize;
1092 u32 tsize;
1093 u32 dma_len;
1094 int count, nrdma;
1095 int i, j, k;
1096
1097 BUG_ON(!ch);
1098 BUG_ON(!ioctx);
1099 cmd = &ioctx->cmd;
1100 dir = cmd->data_direction;
1101 BUG_ON(dir == DMA_NONE);
1102
6f9e7f01
RD		 1103 ioctx->sg = sg = sg_orig = cmd->t_data_sg;
1104 ioctx->sg_cnt = sg_cnt = cmd->t_data_nents;
a42d985b
BVA		 1105
1106 count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
1107 opposite_dma_dir(dir));
1108 if (unlikely(!count))
1109 return -EAGAIN;
1110
1111 ioctx->mapped_sg_count = count;
1112
1113 if (ioctx->rdma_ius && ioctx->n_rdma_ius)
1114 nrdma = ioctx->n_rdma_ius;
1115 else {
1116 nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
1117 + ioctx->n_rbuf;
1118
1119 ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL);
1120 if (!ioctx->rdma_ius)
1121 goto free_mem;
1122
1123 ioctx->n_rdma_ius = nrdma;
1124 }
1125
1126 db = ioctx->rbufs;
1127 tsize = cmd->data_length;
b0768080 1128 dma_len = ib_sg_dma_len(dev, &sg[0]);
a42d985b
BVA		 1129 riu = ioctx->rdma_ius;
1130
1131 /*
1132 * For each remote desc - calculate the #ib_sge.
1133 * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
1134 * each remote desc rdma_iu is required a rdma wr;
1135 * else
1136 * we need to allocate extra rdma_iu to carry extra #ib_sge in
1137 * another rdma wr
1138 */
1139 for (i = 0, j = 0;
1140 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1141 rsize = be32_to_cpu(db->len);
1142 raddr = be64_to_cpu(db->va);
1143 riu->raddr = raddr;
1144 riu->rkey = be32_to_cpu(db->key);
1145 riu->sge_cnt = 0;
1146
1147 /* calculate how many sge required for this remote_buf */
1148 while (rsize > 0 && tsize > 0) {
1149
1150 if (rsize >= dma_len) {
1151 tsize -= dma_len;
1152 rsize -= dma_len;
1153 raddr += dma_len;
1154
1155 if (tsize > 0) {
1156 ++j;
1157 if (j < count) {
1158 sg = sg_next(sg);
b0768080
MM		 1159 dma_len = ib_sg_dma_len(
1160 dev, sg);
a42d985b
BVA		 1161 }
1162 }
1163 } else {
1164 tsize -= rsize;
1165 dma_len -= rsize;
1166 rsize = 0;
1167 }
1168
1169 ++riu->sge_cnt;
1170
1171 if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
1172 ++ioctx->n_rdma;
1173 riu->sge =
1174 kmalloc(riu->sge_cnt * sizeof *riu->sge,
1175 GFP_KERNEL);
1176 if (!riu->sge)
1177 goto free_mem;
1178
1179 ++riu;
1180 riu->sge_cnt = 0;
1181 riu->raddr = raddr;
1182 riu->rkey = be32_to_cpu(db->key);
1183 }
1184 }
1185
1186 ++ioctx->n_rdma;
1187 riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
1188 GFP_KERNEL);
1189 if (!riu->sge)
1190 goto free_mem;
1191 }
1192
1193 db = ioctx->rbufs;
1194 tsize = cmd->data_length;
1195 riu = ioctx->rdma_ius;
1196 sg = sg_orig;
b0768080
MM		 1197 dma_len = ib_sg_dma_len(dev, &sg[0]);
1198 dma_addr = ib_sg_dma_address(dev, &sg[0]);
a42d985b
BVA		 1199
1200 /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
1201 for (i = 0, j = 0;
1202 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1203 rsize = be32_to_cpu(db->len);
1204 sge = riu->sge;
1205 k = 0;
1206
1207 while (rsize > 0 && tsize > 0) {
1208 sge->addr = dma_addr;
1209 sge->lkey = ch->sport->sdev->mr->lkey;
1210
1211 if (rsize >= dma_len) {
1212 sge->length =
1213 (tsize < dma_len) ? tsize : dma_len;
1214 tsize -= dma_len;
1215 rsize -= dma_len;
1216
1217 if (tsize > 0) {
1218 ++j;
1219 if (j < count) {
1220 sg = sg_next(sg);
b0768080
MM		 1221 dma_len = ib_sg_dma_len(
1222 dev, sg);
1223 dma_addr = ib_sg_dma_address(
1224 dev, sg);
a42d985b
BVA		 1225 }
1226 }
1227 } else {
1228 sge->length = (tsize < rsize) ? tsize : rsize;
1229 tsize -= rsize;
1230 dma_len -= rsize;
1231 dma_addr += rsize;
1232 rsize = 0;
1233 }
1234
1235 ++k;
1236 if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
1237 ++riu;
1238 sge = riu->sge;
1239 k = 0;
1240 } else if (rsize > 0 && tsize > 0)
1241 ++sge;
1242 }
1243 }
1244
1245 return 0;
1246
1247free_mem:
1248 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1249
1250 return -ENOMEM;
1251}
1252
1253/**
1254 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1255 */
1256static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1257{
1258 struct srpt_send_ioctx *ioctx;
1259 unsigned long flags;
1260
1261 BUG_ON(!ch);
1262
1263 ioctx = NULL;
1264 spin_lock_irqsave(&ch->spinlock, flags);
1265 if (!list_empty(&ch->free_list)) {
1266 ioctx = list_first_entry(&ch->free_list,
1267 struct srpt_send_ioctx, free_list);
1268 list_del(&ioctx->free_list);
1269 }
1270 spin_unlock_irqrestore(&ch->spinlock, flags);
1271
1272 if (!ioctx)
1273 return ioctx;
1274
1275 BUG_ON(ioctx->ch != ch);
a42d985b
BVA		 1276 spin_lock_init(&ioctx->spinlock);
1277 ioctx->state = SRPT_STATE_NEW;
1278 ioctx->n_rbuf = 0;
1279 ioctx->rbufs = NULL;
1280 ioctx->n_rdma = 0;
1281 ioctx->n_rdma_ius = 0;
1282 ioctx->rdma_ius = NULL;
1283 ioctx->mapped_sg_count = 0;
1284 init_completion(&ioctx->tx_done);
1285 ioctx->queue_status_only = false;
1286 /*
1287 * transport_init_se_cmd() does not initialize all fields, so do it
1288 * here.
1289 */
1290 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1291 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1292
1293 return ioctx;
1294}
1295
a42d985b
BVA		 1296/**
1297 * srpt_abort_cmd() - Abort a SCSI command.
1298 * @ioctx: I/O context associated with the SCSI command.
1299 * @context: Preferred execution context.
1300 */
1301static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1302{
1303 enum srpt_command_state state;
1304 unsigned long flags;
1305
1306 BUG_ON(!ioctx);
1307
1308 /*
1309 * If the command is in a state where the target core is waiting for
1310 * the ib_srpt driver, change the state to the next state. Changing
1311 * the state of the command from SRPT_STATE_NEED_DATA to
1312 * SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this
1313 * function a second time.
1314 */
1315
1316 spin_lock_irqsave(&ioctx->spinlock, flags);
1317 state = ioctx->state;
1318 switch (state) {
1319 case SRPT_STATE_NEED_DATA:
1320 ioctx->state = SRPT_STATE_DATA_IN;
1321 break;
1322 case SRPT_STATE_DATA_IN:
1323 case SRPT_STATE_CMD_RSP_SENT:
1324 case SRPT_STATE_MGMT_RSP_SENT:
1325 ioctx->state = SRPT_STATE_DONE;
1326 break;
1327 default:
1328 break;
1329 }
1330 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1331
9474b043
NB		 1332 if (state == SRPT_STATE_DONE) {
1333 struct srpt_rdma_ch *ch = ioctx->ch;
1334
1335 BUG_ON(ch->sess == NULL);
1336
1337 target_put_sess_cmd(ch->sess, &ioctx->cmd);
a42d985b 1338 goto out;
9474b043 1339 }
a42d985b
BVA		 1340
1341 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1342 ioctx->tag);
1343
1344 switch (state) {
1345 case SRPT_STATE_NEW:
1346 case SRPT_STATE_DATA_IN:
1347 case SRPT_STATE_MGMT:
1348 /*
1349 * Do nothing - defer abort processing until
1350 * srpt_queue_response() is invoked.
1351 */
1352 WARN_ON(!transport_check_aborted_status(&ioctx->cmd, false));
1353 break;
1354 case SRPT_STATE_NEED_DATA:
1355 /* DMA_TO_DEVICE (write) - RDMA read error. */
e672a47f
CH		 1356
1357 /* XXX(hch): this is a horrible layering violation.. */
7d680f3b 1358 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags);
e672a47f 1359 ioctx->cmd.transport_state &= ~CMD_T_ACTIVE;
7d680f3b 1360 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags);
a42d985b
BVA		 1361 break;
1362 case SRPT_STATE_CMD_RSP_SENT:
1363 /*
1364 * SRP_RSP sending failed or the SRP_RSP send completion has
1365 * not been received in time.
1366 */
1367 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
9474b043 1368 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
a42d985b
BVA		 1369 break;
1370 case SRPT_STATE_MGMT_RSP_SENT:
1371 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
9474b043 1372 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
a42d985b
BVA		 1373 break;
1374 default:
532ec6f1 1375 WARN(1, "Unexpected command state (%d)", state);
a42d985b
BVA		 1376 break;
1377 }
1378
1379out:
1380 return state;
1381}
1382
1383/**
1384 * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
1385 */
1386static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id)
1387{
1388 struct srpt_send_ioctx *ioctx;
1389 enum srpt_command_state state;
1390 struct se_cmd *cmd;
1391 u32 index;
1392
1393 atomic_inc(&ch->sq_wr_avail);
1394
1395 index = idx_from_wr_id(wr_id);
1396 ioctx = ch->ioctx_ring[index];
1397 state = srpt_get_cmd_state(ioctx);
1398 cmd = &ioctx->cmd;
1399
1400 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1401 && state != SRPT_STATE_MGMT_RSP_SENT
1402 && state != SRPT_STATE_NEED_DATA
1403 && state != SRPT_STATE_DONE);
1404
1405 /* If SRP_RSP sending failed, undo the ch->req_lim change. */
1406 if (state == SRPT_STATE_CMD_RSP_SENT
1407 || state == SRPT_STATE_MGMT_RSP_SENT)
1408 atomic_dec(&ch->req_lim);
1409
1410 srpt_abort_cmd(ioctx);
1411}
1412
1413/**
1414 * srpt_handle_send_comp() - Process an IB send completion notification.
1415 */
1416static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
1417 struct srpt_send_ioctx *ioctx)
1418{
1419 enum srpt_command_state state;
1420
1421 atomic_inc(&ch->sq_wr_avail);
1422
1423 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1424
1425 if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1426 && state != SRPT_STATE_MGMT_RSP_SENT
1427 && state != SRPT_STATE_DONE))
1428 pr_debug("state = %d\n", state);
1429
9474b043
NB		 1430 if (state != SRPT_STATE_DONE) {
1431 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1432 transport_generic_free_cmd(&ioctx->cmd, 0);
1433 } else {
a42d985b
BVA		 1434 printk(KERN_ERR "IB completion has been received too late for"
1435 " wr_id = %u.\n", ioctx->ioctx.index);
9474b043 1436 }
a42d985b
BVA		 1437}
1438
1439/**
1440 * srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
1441 *
e672a47f
CH		 1442 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1443 * the data that has been transferred via IB RDMA had to be postponed until the
142ad5db 1444 * check_stop_free() callback. None of this is necessary anymore and needs to
e672a47f 1445 * be cleaned up.
a42d985b
BVA		 1446 */
1447static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
1448 struct srpt_send_ioctx *ioctx,
1449 enum srpt_opcode opcode)
1450{
1451 WARN_ON(ioctx->n_rdma <= 0);
1452 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1453
1454 if (opcode == SRPT_RDMA_READ_LAST) {
1455 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1456 SRPT_STATE_DATA_IN))
e672a47f 1457 target_execute_cmd(&ioctx->cmd);
a42d985b
BVA		 1458 else
1459 printk(KERN_ERR "%s[%d]: wrong state = %d\n", __func__,
1460 __LINE__, srpt_get_cmd_state(ioctx));
1461 } else if (opcode == SRPT_RDMA_ABORT) {
1462 ioctx->rdma_aborted = true;
1463 } else {
1464 WARN(true, "unexpected opcode %d\n", opcode);
1465 }
1466}
1467
1468/**
1469 * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
1470 */
1471static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
1472 struct srpt_send_ioctx *ioctx,
1473 enum srpt_opcode opcode)
1474{
1475 struct se_cmd *cmd;
1476 enum srpt_command_state state;
1477
1478 cmd = &ioctx->cmd;
1479 state = srpt_get_cmd_state(ioctx);
1480 switch (opcode) {
1481 case SRPT_RDMA_READ_LAST:
1482 if (ioctx->n_rdma <= 0) {
1483 printk(KERN_ERR "Received invalid RDMA read"
1484 " error completion with idx %d\n",
1485 ioctx->ioctx.index);
1486 break;
1487 }
1488 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1489 if (state == SRPT_STATE_NEED_DATA)
1490 srpt_abort_cmd(ioctx);
1491 else
1492 printk(KERN_ERR "%s[%d]: wrong state = %d\n",
1493 __func__, __LINE__, state);
1494 break;
1495 case SRPT_RDMA_WRITE_LAST:
a42d985b
BVA		 1496 break;
1497 default:
1498 printk(KERN_ERR "%s[%d]: opcode = %u\n", __func__,
1499 __LINE__, opcode);
1500 break;
1501 }
1502}
1503
1504/**
1505 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1506 * @ch: RDMA channel through which the request has been received.
1507 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1508 * be built in the buffer ioctx->buf points at and hence this function will
1509 * overwrite the request data.
1510 * @tag: tag of the request for which this response is being generated.
1511 * @status: value for the STATUS field of the SRP_RSP information unit.
1512 *
1513 * Returns the size in bytes of the SRP_RSP response.
1514 *
1515 * An SRP_RSP response contains a SCSI status or service response. See also
1516 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1517 * response. See also SPC-2 for more information about sense data.
1518 */
1519static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1520 struct srpt_send_ioctx *ioctx, u64 tag,
1521 int status)
1522{
1523 struct srp_rsp *srp_rsp;
1524 const u8 *sense_data;
1525 int sense_data_len, max_sense_len;
1526
1527 /*
1528 * The lowest bit of all SAM-3 status codes is zero (see also
1529 * paragraph 5.3 in SAM-3).
1530 */
1531 WARN_ON(status & 1);
1532
1533 srp_rsp = ioctx->ioctx.buf;
1534 BUG_ON(!srp_rsp);
1535
1536 sense_data = ioctx->sense_data;
1537 sense_data_len = ioctx->cmd.scsi_sense_length;
1538 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1539
1540 memset(srp_rsp, 0, sizeof *srp_rsp);
1541 srp_rsp->opcode = SRP_RSP;
1542 srp_rsp->req_lim_delta =
1543 __constant_cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1544 srp_rsp->tag = tag;
1545 srp_rsp->status = status;
1546
1547 if (sense_data_len) {
1548 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1549 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1550 if (sense_data_len > max_sense_len) {
1551 printk(KERN_WARNING "truncated sense data from %d to %d"
1552 " bytes\n", sense_data_len, max_sense_len);
1553 sense_data_len = max_sense_len;
1554 }
1555
1556 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1557 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1558 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1559 }
1560
1561 return sizeof(*srp_rsp) + sense_data_len;
1562}
1563
1564/**
1565 * srpt_build_tskmgmt_rsp() - Build a task management response.
1566 * @ch: RDMA channel through which the request has been received.
1567 * @ioctx: I/O context in which the SRP_RSP response will be built.
1568 * @rsp_code: RSP_CODE that will be stored in the response.
1569 * @tag: Tag of the request for which this response is being generated.
1570 *
1571 * Returns the size in bytes of the SRP_RSP response.
1572 *
1573 * An SRP_RSP response contains a SCSI status or service response. See also
1574 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1575 * response.
1576 */
1577static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1578 struct srpt_send_ioctx *ioctx,
1579 u8 rsp_code, u64 tag)
1580{
1581 struct srp_rsp *srp_rsp;
1582 int resp_data_len;
1583 int resp_len;
1584
c807f643 1585 resp_data_len = 4;
a42d985b
BVA		 1586 resp_len = sizeof(*srp_rsp) + resp_data_len;
1587
1588 srp_rsp = ioctx->ioctx.buf;
1589 BUG_ON(!srp_rsp);
1590 memset(srp_rsp, 0, sizeof *srp_rsp);
1591
1592 srp_rsp->opcode = SRP_RSP;
1593 srp_rsp->req_lim_delta = __constant_cpu_to_be32(1
1594 + atomic_xchg(&ch->req_lim_delta, 0));
1595 srp_rsp->tag = tag;
1596
c807f643
JW		 1597 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1598 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1599 srp_rsp->data[3] = rsp_code;
a42d985b
BVA		 1600
1601 return resp_len;
1602}
1603
1604#define NO_SUCH_LUN ((uint64_t)-1LL)
1605
1606/*
1607 * SCSI LUN addressing method. See also SAM-2 and the section about
1608 * eight byte LUNs.
1609 */
1610enum scsi_lun_addr_method {
1611 SCSI_LUN_ADDR_METHOD_PERIPHERAL = 0,
1612 SCSI_LUN_ADDR_METHOD_FLAT = 1,
1613 SCSI_LUN_ADDR_METHOD_LUN = 2,
1614 SCSI_LUN_ADDR_METHOD_EXTENDED_LUN = 3,
1615};
1616
1617/*
1618 * srpt_unpack_lun() - Convert from network LUN to linear LUN.
1619 *
1620 * Convert an 2-byte, 4-byte, 6-byte or 8-byte LUN structure in network byte
1621 * order (big endian) to a linear LUN. Supports three LUN addressing methods:
1622 * peripheral, flat and logical unit. See also SAM-2, section 4.9.4 (page 40).
1623 */
1624static uint64_t srpt_unpack_lun(const uint8_t *lun, int len)
1625{
1626 uint64_t res = NO_SUCH_LUN;
1627 int addressing_method;
1628
1629 if (unlikely(len < 2)) {
1630 printk(KERN_ERR "Illegal LUN length %d, expected 2 bytes or "
1631 "more", len);
1632 goto out;
1633 }
1634
1635 switch (len) {
1636 case 8:
1637 if ((*((__be64 *)lun) &
1638 __constant_cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
1639 goto out_err;
1640 break;
1641 case 4:
1642 if (*((__be16 *)&lun[2]) != 0)
1643 goto out_err;
1644 break;
1645 case 6:
1646 if (*((__be32 *)&lun[2]) != 0)
1647 goto out_err;
1648 break;
1649 case 2:
1650 break;
1651 default:
1652 goto out_err;
1653 }
1654
1655 addressing_method = (*lun) >> 6; /* highest two bits of byte 0 */
1656 switch (addressing_method) {
1657 case SCSI_LUN_ADDR_METHOD_PERIPHERAL:
1658 case SCSI_LUN_ADDR_METHOD_FLAT:
1659 case SCSI_LUN_ADDR_METHOD_LUN:
1660 res = *(lun + 1) | (((*lun) & 0x3f) << 8);
1661 break;
1662
1663 case SCSI_LUN_ADDR_METHOD_EXTENDED_LUN:
1664 default:
1665 printk(KERN_ERR "Unimplemented LUN addressing method %u",
1666 addressing_method);
1667 break;
1668 }
1669
1670out:
1671 return res;
1672
1673out_err:
1674 printk(KERN_ERR "Support for multi-level LUNs has not yet been"
1675 " implemented");
1676 goto out;
1677}
1678
1679static int srpt_check_stop_free(struct se_cmd *cmd)
1680{
9474b043
NB		 1681 struct srpt_send_ioctx *ioctx = container_of(cmd,
1682 struct srpt_send_ioctx, cmd);
a42d985b 1683
9474b043 1684 return target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
a42d985b
BVA		 1685}
1686
1687/**
1688 * srpt_handle_cmd() - Process SRP_CMD.
1689 */
1690static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
1691 struct srpt_recv_ioctx *recv_ioctx,
1692 struct srpt_send_ioctx *send_ioctx)
1693{
1694 struct se_cmd *cmd;
1695 struct srp_cmd *srp_cmd;
1696 uint64_t unpacked_lun;
1697 u64 data_len;
1698 enum dma_data_direction dir;
de103c93 1699 sense_reason_t ret;
9474b043 1700 int rc;
a42d985b
BVA		 1701
1702 BUG_ON(!send_ioctx);
1703
1704 srp_cmd = recv_ioctx->ioctx.buf;
a42d985b
BVA		 1705 cmd = &send_ioctx->cmd;
1706 send_ioctx->tag = srp_cmd->tag;
1707
1708 switch (srp_cmd->task_attr) {
1709 case SRP_CMD_SIMPLE_Q:
1710 cmd->sam_task_attr = MSG_SIMPLE_TAG;
1711 break;
1712 case SRP_CMD_ORDERED_Q:
1713 default:
1714 cmd->sam_task_attr = MSG_ORDERED_TAG;
1715 break;
1716 case SRP_CMD_HEAD_OF_Q:
1717 cmd->sam_task_attr = MSG_HEAD_TAG;
1718 break;
1719 case SRP_CMD_ACA:
1720 cmd->sam_task_attr = MSG_ACA_TAG;
1721 break;
1722 }
1723
de103c93 1724 if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) {
a42d985b
BVA		 1725 printk(KERN_ERR "0x%llx: parsing SRP descriptor table failed.\n",
1726 srp_cmd->tag);
de103c93 1727 ret = TCM_INVALID_CDB_FIELD;
a42d985b
BVA		 1728 goto send_sense;
1729 }
1730
a42d985b
BVA		 1731 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_cmd->lun,
1732 sizeof(srp_cmd->lun));
9474b043
NB		 1733 rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb,
1734 &send_ioctx->sense_data[0], unpacked_lun, data_len,
1735 MSG_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
1736 if (rc != 0) {
1737 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
a42d985b 1738 goto send_sense;
187e70a5 1739 }
a42d985b
BVA		 1740 return 0;
1741
1742send_sense:
de103c93 1743 transport_send_check_condition_and_sense(cmd, ret, 0);
a42d985b
BVA		 1744 return -1;
1745}
1746
1747/**
1748 * srpt_rx_mgmt_fn_tag() - Process a task management function by tag.
1749 * @ch: RDMA channel of the task management request.
1750 * @fn: Task management function to perform.
1751 * @req_tag: Tag of the SRP task management request.
1752 * @mgmt_ioctx: I/O context of the task management request.
1753 *
1754 * Returns zero if the target core will process the task management
1755 * request asynchronously.
1756 *
1757 * Note: It is assumed that the initiator serializes tag-based task management
1758 * requests.
1759 */
1760static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag)
1761{
1762 struct srpt_device *sdev;
1763 struct srpt_rdma_ch *ch;
1764 struct srpt_send_ioctx *target;
1765 int ret, i;
1766
1767 ret = -EINVAL;
1768 ch = ioctx->ch;
1769 BUG_ON(!ch);
1770 BUG_ON(!ch->sport);
1771 sdev = ch->sport->sdev;
1772 BUG_ON(!sdev);
1773 spin_lock_irq(&sdev->spinlock);
1774 for (i = 0; i < ch->rq_size; ++i) {
1775 target = ch->ioctx_ring[i];
1776 if (target->cmd.se_lun == ioctx->cmd.se_lun &&
1777 target->tag == tag &&
1778 srpt_get_cmd_state(target) != SRPT_STATE_DONE) {
1779 ret = 0;
1780 /* now let the target core abort &target->cmd; */
1781 break;
1782 }
1783 }
1784 spin_unlock_irq(&sdev->spinlock);
1785 return ret;
1786}
1787
1788static int srp_tmr_to_tcm(int fn)
1789{
1790 switch (fn) {
1791 case SRP_TSK_ABORT_TASK:
1792 return TMR_ABORT_TASK;
1793 case SRP_TSK_ABORT_TASK_SET:
1794 return TMR_ABORT_TASK_SET;
1795 case SRP_TSK_CLEAR_TASK_SET:
1796 return TMR_CLEAR_TASK_SET;
1797 case SRP_TSK_LUN_RESET:
1798 return TMR_LUN_RESET;
1799 case SRP_TSK_CLEAR_ACA:
1800 return TMR_CLEAR_ACA;
1801 default:
1802 return -1;
1803 }
1804}
1805
1806/**
1807 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1808 *
1809 * Returns 0 if and only if the request will be processed by the target core.
1810 *
1811 * For more information about SRP_TSK_MGMT information units, see also section
1812 * 6.7 in the SRP r16a document.
1813 */
1814static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1815 struct srpt_recv_ioctx *recv_ioctx,
1816 struct srpt_send_ioctx *send_ioctx)
1817{
1818 struct srp_tsk_mgmt *srp_tsk;
1819 struct se_cmd *cmd;
3e4f5748 1820 struct se_session *sess = ch->sess;
a42d985b 1821 uint64_t unpacked_lun;
3e4f5748 1822 uint32_t tag = 0;
a42d985b 1823 int tcm_tmr;
3e4f5748 1824 int rc;
a42d985b
BVA		 1825
1826 BUG_ON(!send_ioctx);
1827
1828 srp_tsk = recv_ioctx->ioctx.buf;
1829 cmd = &send_ioctx->cmd;
1830
1831 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1832 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1833 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1834
1835 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1836 send_ioctx->tag = srp_tsk->tag;
1837 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1838 if (tcm_tmr < 0) {
a42d985b
BVA		 1839 send_ioctx->cmd.se_tmr_req->response =
1840 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
de103c93 1841 goto fail;
a42d985b 1842 }
a42d985b
BVA		 1843 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_tsk->lun,
1844 sizeof(srp_tsk->lun));
3e4f5748
NB		 1845
1846 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK) {
1847 rc = srpt_rx_mgmt_fn_tag(send_ioctx, srp_tsk->task_tag);
1848 if (rc < 0) {
1849 send_ioctx->cmd.se_tmr_req->response =
1850 TMR_TASK_DOES_NOT_EXIST;
1851 goto fail;
1852 }
1853 tag = srp_tsk->task_tag;
1854 }
1855 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, unpacked_lun,
1856 srp_tsk, tcm_tmr, GFP_KERNEL, tag,
1857 TARGET_SCF_ACK_KREF);
1858 if (rc != 0) {
1859 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
de103c93 1860 goto fail;
a42d985b 1861 }
de103c93
CH		 1862 return;
1863fail:
de103c93 1864 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
a42d985b
BVA		 1865}
1866
1867/**
1868 * srpt_handle_new_iu() - Process a newly received information unit.
1869 * @ch: RDMA channel through which the information unit has been received.
1870 * @ioctx: SRPT I/O context associated with the information unit.
1871 */
1872static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1873 struct srpt_recv_ioctx *recv_ioctx,
1874 struct srpt_send_ioctx *send_ioctx)
1875{
1876 struct srp_cmd *srp_cmd;
1877 enum rdma_ch_state ch_state;
1878
1879 BUG_ON(!ch);
1880 BUG_ON(!recv_ioctx);
1881
1882 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1883 recv_ioctx->ioctx.dma, srp_max_req_size,
1884 DMA_FROM_DEVICE);
1885
1886 ch_state = srpt_get_ch_state(ch);
1887 if (unlikely(ch_state == CH_CONNECTING)) {
1888 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1889 goto out;
1890 }
1891
1892 if (unlikely(ch_state != CH_LIVE))
1893 goto out;
1894
1895 srp_cmd = recv_ioctx->ioctx.buf;
1896 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1897 if (!send_ioctx)
1898 send_ioctx = srpt_get_send_ioctx(ch);
1899 if (unlikely(!send_ioctx)) {
1900 list_add_tail(&recv_ioctx->wait_list,
1901 &ch->cmd_wait_list);
1902 goto out;
1903 }
1904 }
1905
a42d985b
BVA		 1906 switch (srp_cmd->opcode) {
1907 case SRP_CMD:
1908 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1909 break;
1910 case SRP_TSK_MGMT:
1911 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1912 break;
1913 case SRP_I_LOGOUT:
1914 printk(KERN_ERR "Not yet implemented: SRP_I_LOGOUT\n");
1915 break;
1916 case SRP_CRED_RSP:
1917 pr_debug("received SRP_CRED_RSP\n");
1918 break;
1919 case SRP_AER_RSP:
1920 pr_debug("received SRP_AER_RSP\n");
1921 break;
1922 case SRP_RSP:
1923 printk(KERN_ERR "Received SRP_RSP\n");
1924 break;
1925 default:
1926 printk(KERN_ERR "received IU with unknown opcode 0x%x\n",
1927 srp_cmd->opcode);
1928 break;
1929 }
1930
1931 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1932out:
1933 return;
1934}
1935
1936static void srpt_process_rcv_completion(struct ib_cq *cq,
1937 struct srpt_rdma_ch *ch,
1938 struct ib_wc *wc)
1939{
1940 struct srpt_device *sdev = ch->sport->sdev;
1941 struct srpt_recv_ioctx *ioctx;
1942 u32 index;
1943
1944 index = idx_from_wr_id(wc->wr_id);
1945 if (wc->status == IB_WC_SUCCESS) {
1946 int req_lim;
1947
1948 req_lim = atomic_dec_return(&ch->req_lim);
1949 if (unlikely(req_lim < 0))
1950 printk(KERN_ERR "req_lim = %d < 0\n", req_lim);
1951 ioctx = sdev->ioctx_ring[index];
1952 srpt_handle_new_iu(ch, ioctx, NULL);
1953 } else {
1954 printk(KERN_INFO "receiving failed for idx %u with status %d\n",
1955 index, wc->status);
1956 }
1957}
1958
1959/**
1960 * srpt_process_send_completion() - Process an IB send completion.
1961 *
1962 * Note: Although this has not yet been observed during tests, at least in
1963 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1964 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1965 * value in each response is set to one, and it is possible that this response
1966 * makes the initiator send a new request before the send completion for that
1967 * response has been processed. This could e.g. happen if the call to
1968 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1969 * if IB retransmission causes generation of the send completion to be
1970 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1971 * are queued on cmd_wait_list. The code below processes these delayed
1972 * requests one at a time.
1973 */
1974static void srpt_process_send_completion(struct ib_cq *cq,
1975 struct srpt_rdma_ch *ch,
1976 struct ib_wc *wc)
1977{
1978 struct srpt_send_ioctx *send_ioctx;
1979 uint32_t index;
1980 enum srpt_opcode opcode;
1981
1982 index = idx_from_wr_id(wc->wr_id);
1983 opcode = opcode_from_wr_id(wc->wr_id);
1984 send_ioctx = ch->ioctx_ring[index];
1985 if (wc->status == IB_WC_SUCCESS) {
1986 if (opcode == SRPT_SEND)
1987 srpt_handle_send_comp(ch, send_ioctx);
1988 else {
1989 WARN_ON(opcode != SRPT_RDMA_ABORT &&
1990 wc->opcode != IB_WC_RDMA_READ);
1991 srpt_handle_rdma_comp(ch, send_ioctx, opcode);
1992 }
1993 } else {
1994 if (opcode == SRPT_SEND) {
1995 printk(KERN_INFO "sending response for idx %u failed"
1996 " with status %d\n", index, wc->status);
1997 srpt_handle_send_err_comp(ch, wc->wr_id);
1998 } else if (opcode != SRPT_RDMA_MID) {
1999 printk(KERN_INFO "RDMA t %d for idx %u failed with"
2000 " status %d", opcode, index, wc->status);
2001 srpt_handle_rdma_err_comp(ch, send_ioctx, opcode);
2002 }
2003 }
2004
2005 while (unlikely(opcode == SRPT_SEND
2006 && !list_empty(&ch->cmd_wait_list)
2007 && srpt_get_ch_state(ch) == CH_LIVE
2008 && (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) {
2009 struct srpt_recv_ioctx *recv_ioctx;
2010
2011 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
2012 struct srpt_recv_ioctx,
2013 wait_list);
2014 list_del(&recv_ioctx->wait_list);
2015 srpt_handle_new_iu(ch, recv_ioctx, send_ioctx);
2016 }
2017}
2018
2019static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch)
2020{
2021 struct ib_wc *const wc = ch->wc;
2022 int i, n;
2023
2024 WARN_ON(cq != ch->cq);
2025
2026 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
2027 while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
2028 for (i = 0; i < n; i++) {
2029 if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
2030 srpt_process_rcv_completion(cq, ch, &wc[i]);
2031 else
2032 srpt_process_send_completion(cq, ch, &wc[i]);
2033 }
2034 }
2035}
2036
2037/**
2038 * srpt_completion() - IB completion queue callback function.
2039 *
2040 * Notes:
2041 * - It is guaranteed that a completion handler will never be invoked
2042 * concurrently on two different CPUs for the same completion queue. See also
2043 * Documentation/infiniband/core_locking.txt and the implementation of
2044 * handle_edge_irq() in kernel/irq/chip.c.
2045 * - When threaded IRQs are enabled, completion handlers are invoked in thread
2046 * context instead of interrupt context.
2047 */
2048static void srpt_completion(struct ib_cq *cq, void *ctx)
2049{
2050 struct srpt_rdma_ch *ch = ctx;
2051
2052 wake_up_interruptible(&ch->wait_queue);
2053}
2054
2055static int srpt_compl_thread(void *arg)
2056{
2057 struct srpt_rdma_ch *ch;
2058
2059 /* Hibernation / freezing of the SRPT kernel thread is not supported. */
2060 current->flags |= PF_NOFREEZE;
2061
2062 ch = arg;
2063 BUG_ON(!ch);
2064 printk(KERN_INFO "Session %s: kernel thread %s (PID %d) started\n",
2065 ch->sess_name, ch->thread->comm, current->pid);
2066 while (!kthread_should_stop()) {
2067 wait_event_interruptible(ch->wait_queue,
2068 (srpt_process_completion(ch->cq, ch),
2069 kthread_should_stop()));
2070 }
2071 printk(KERN_INFO "Session %s: kernel thread %s (PID %d) stopped\n",
2072 ch->sess_name, ch->thread->comm, current->pid);
2073 return 0;
2074}
2075
2076/**
2077 * srpt_create_ch_ib() - Create receive and send completion queues.
2078 */
2079static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
2080{
2081 struct ib_qp_init_attr *qp_init;
2082 struct srpt_port *sport = ch->sport;
2083 struct srpt_device *sdev = sport->sdev;
2084 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
2085 int ret;
2086
2087 WARN_ON(ch->rq_size < 1);
2088
2089 ret = -ENOMEM;
2090 qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
2091 if (!qp_init)
2092 goto out;
2093
2094 ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
2095 ch->rq_size + srp_sq_size, 0);
2096 if (IS_ERR(ch->cq)) {
2097 ret = PTR_ERR(ch->cq);
2098 printk(KERN_ERR "failed to create CQ cqe= %d ret= %d\n",
2099 ch->rq_size + srp_sq_size, ret);
2100 goto out;
2101 }
2102
2103 qp_init->qp_context = (void *)ch;
2104 qp_init->event_handler
2105 = (void(*)(struct ib_event *, void*))srpt_qp_event;
2106 qp_init->send_cq = ch->cq;
2107 qp_init->recv_cq = ch->cq;
2108 qp_init->srq = sdev->srq;
2109 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
2110 qp_init->qp_type = IB_QPT_RC;
2111 qp_init->cap.max_send_wr = srp_sq_size;
2112 qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
2113
2114 ch->qp = ib_create_qp(sdev->pd, qp_init);
2115 if (IS_ERR(ch->qp)) {
2116 ret = PTR_ERR(ch->qp);
2117 printk(KERN_ERR "failed to create_qp ret= %d\n", ret);
2118 goto err_destroy_cq;
2119 }
2120
2121 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
2122
2123 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
2124 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
2125 qp_init->cap.max_send_wr, ch->cm_id);
2126
2127 ret = srpt_init_ch_qp(ch, ch->qp);
2128 if (ret)
2129 goto err_destroy_qp;
2130
2131 init_waitqueue_head(&ch->wait_queue);
2132
2133 pr_debug("creating thread for session %s\n", ch->sess_name);
2134
2135 ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl");
2136 if (IS_ERR(ch->thread)) {
2137 printk(KERN_ERR "failed to create kernel thread %ld\n",
2138 PTR_ERR(ch->thread));
2139 ch->thread = NULL;
2140 goto err_destroy_qp;
2141 }
2142
2143out:
2144 kfree(qp_init);
2145 return ret;
2146
2147err_destroy_qp:
2148 ib_destroy_qp(ch->qp);
2149err_destroy_cq:
2150 ib_destroy_cq(ch->cq);
2151 goto out;
2152}
2153
2154static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
2155{
2156 if (ch->thread)
2157 kthread_stop(ch->thread);
2158
2159 ib_destroy_qp(ch->qp);
2160 ib_destroy_cq(ch->cq);
2161}
2162
2163/**
2164 * __srpt_close_ch() - Close an RDMA channel by setting the QP error state.
2165 *
2166 * Reset the QP and make sure all resources associated with the channel will
2167 * be deallocated at an appropriate time.
2168 *
2169 * Note: The caller must hold ch->sport->sdev->spinlock.
2170 */
2171static void __srpt_close_ch(struct srpt_rdma_ch *ch)
2172{
2173 struct srpt_device *sdev;
2174 enum rdma_ch_state prev_state;
2175 unsigned long flags;
2176
2177 sdev = ch->sport->sdev;
2178
2179 spin_lock_irqsave(&ch->spinlock, flags);
2180 prev_state = ch->state;
2181 switch (prev_state) {
2182 case CH_CONNECTING:
2183 case CH_LIVE:
2184 ch->state = CH_DISCONNECTING;
2185 break;
2186 default:
2187 break;
2188 }
2189 spin_unlock_irqrestore(&ch->spinlock, flags);
2190
2191 switch (prev_state) {
2192 case CH_CONNECTING:
2193 ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0,
2194 NULL, 0);
2195 /* fall through */
2196 case CH_LIVE:
2197 if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0)
2198 printk(KERN_ERR "sending CM DREQ failed.\n");
2199 break;
2200 case CH_DISCONNECTING:
2201 break;
2202 case CH_DRAINING:
2203 case CH_RELEASING:
2204 break;
2205 }
2206}
2207
2208/**
2209 * srpt_close_ch() - Close an RDMA channel.
2210 */
2211static void srpt_close_ch(struct srpt_rdma_ch *ch)
2212{
2213 struct srpt_device *sdev;
2214
2215 sdev = ch->sport->sdev;
2216 spin_lock_irq(&sdev->spinlock);
2217 __srpt_close_ch(ch);
2218 spin_unlock_irq(&sdev->spinlock);
2219}
2220
1d19f780
NB		 2221/**
2222 * srpt_shutdown_session() - Whether or not a session may be shut down.
2223 */
2224static int srpt_shutdown_session(struct se_session *se_sess)
2225{
2226 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2227 unsigned long flags;
2228
2229 spin_lock_irqsave(&ch->spinlock, flags);
2230 if (ch->in_shutdown) {
2231 spin_unlock_irqrestore(&ch->spinlock, flags);
2232 return true;
2233 }
2234
2235 ch->in_shutdown = true;
2236 target_sess_cmd_list_set_waiting(se_sess);
2237 spin_unlock_irqrestore(&ch->spinlock, flags);
2238
2239 return true;
2240}
2241
a42d985b
BVA		 2242/**
2243 * srpt_drain_channel() - Drain a channel by resetting the IB queue pair.
2244 * @cm_id: Pointer to the CM ID of the channel to be drained.
2245 *
2246 * Note: Must be called from inside srpt_cm_handler to avoid a race between
2247 * accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one()
2248 * (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one()
2249 * waits until all target sessions for the associated IB device have been
2250 * unregistered and target session registration involves a call to
2251 * ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until
2252 * this function has finished).
2253 */
2254static void srpt_drain_channel(struct ib_cm_id *cm_id)
2255{
2256 struct srpt_device *sdev;
2257 struct srpt_rdma_ch *ch;
2258 int ret;
2259 bool do_reset = false;
2260
2261 WARN_ON_ONCE(irqs_disabled());
2262
2263 sdev = cm_id->context;
2264 BUG_ON(!sdev);
2265 spin_lock_irq(&sdev->spinlock);
2266 list_for_each_entry(ch, &sdev->rch_list, list) {
2267 if (ch->cm_id == cm_id) {
2268 do_reset = srpt_test_and_set_ch_state(ch,
2269 CH_CONNECTING, CH_DRAINING) ||
2270 srpt_test_and_set_ch_state(ch,
2271 CH_LIVE, CH_DRAINING) ||
2272 srpt_test_and_set_ch_state(ch,
2273 CH_DISCONNECTING, CH_DRAINING);
2274 break;
2275 }
2276 }
2277 spin_unlock_irq(&sdev->spinlock);
2278
2279 if (do_reset) {
1d19f780
NB		 2280 if (ch->sess)
2281 srpt_shutdown_session(ch->sess);
2282
a42d985b
BVA		 2283 ret = srpt_ch_qp_err(ch);
2284 if (ret < 0)
2285 printk(KERN_ERR "Setting queue pair in error state"
2286 " failed: %d\n", ret);
2287 }
2288}
2289
2290/**
2291 * srpt_find_channel() - Look up an RDMA channel.
2292 * @cm_id: Pointer to the CM ID of the channel to be looked up.
2293 *
2294 * Return NULL if no matching RDMA channel has been found.
2295 */
2296static struct srpt_rdma_ch *srpt_find_channel(struct srpt_device *sdev,
2297 struct ib_cm_id *cm_id)
2298{
2299 struct srpt_rdma_ch *ch;
2300 bool found;
2301
2302 WARN_ON_ONCE(irqs_disabled());
2303 BUG_ON(!sdev);
2304
2305 found = false;
2306 spin_lock_irq(&sdev->spinlock);
2307 list_for_each_entry(ch, &sdev->rch_list, list) {
2308 if (ch->cm_id == cm_id) {
2309 found = true;
2310 break;
2311 }
2312 }
2313 spin_unlock_irq(&sdev->spinlock);
2314
2315 return found ? ch : NULL;
2316}
2317
2318/**
2319 * srpt_release_channel() - Release channel resources.
2320 *
2321 * Schedules the actual release because:
2322 * - Calling the ib_destroy_cm_id() call from inside an IB CM callback would
2323 * trigger a deadlock.
2324 * - It is not safe to call TCM transport_* functions from interrupt context.
2325 */
2326static void srpt_release_channel(struct srpt_rdma_ch *ch)
2327{
2328 schedule_work(&ch->release_work);
2329}
2330
2331static void srpt_release_channel_work(struct work_struct *w)
2332{
2333 struct srpt_rdma_ch *ch;
2334 struct srpt_device *sdev;
9474b043 2335 struct se_session *se_sess;
a42d985b
BVA		 2336
2337 ch = container_of(w, struct srpt_rdma_ch, release_work);
2338 pr_debug("ch = %p; ch->sess = %p; release_done = %p\n", ch, ch->sess,
2339 ch->release_done);
2340
2341 sdev = ch->sport->sdev;
2342 BUG_ON(!sdev);
2343
9474b043
NB		 2344 se_sess = ch->sess;
2345 BUG_ON(!se_sess);
2346
be646c2d 2347 target_wait_for_sess_cmds(se_sess);
9474b043
NB		 2348
2349 transport_deregister_session_configfs(se_sess);
2350 transport_deregister_session(se_sess);
a42d985b
BVA		 2351 ch->sess = NULL;
2352
0b41d6ca
NB		 2353 ib_destroy_cm_id(ch->cm_id);
2354
a42d985b
BVA		 2355 srpt_destroy_ch_ib(ch);
2356
2357 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2358 ch->sport->sdev, ch->rq_size,
2359 ch->rsp_size, DMA_TO_DEVICE);
2360
2361 spin_lock_irq(&sdev->spinlock);
2362 list_del(&ch->list);
2363 spin_unlock_irq(&sdev->spinlock);
2364
a42d985b
BVA		 2365 if (ch->release_done)
2366 complete(ch->release_done);
2367
2368 wake_up(&sdev->ch_releaseQ);
2369
2370 kfree(ch);
2371}
2372
2373static struct srpt_node_acl *__srpt_lookup_acl(struct srpt_port *sport,
2374 u8 i_port_id[16])
2375{
2376 struct srpt_node_acl *nacl;
2377
2378 list_for_each_entry(nacl, &sport->port_acl_list, list)
2379 if (memcmp(nacl->i_port_id, i_port_id,
2380 sizeof(nacl->i_port_id)) == 0)
2381 return nacl;
2382
2383 return NULL;
2384}
2385
2386static struct srpt_node_acl *srpt_lookup_acl(struct srpt_port *sport,
2387 u8 i_port_id[16])
2388{
2389 struct srpt_node_acl *nacl;
2390
2391 spin_lock_irq(&sport->port_acl_lock);
2392 nacl = __srpt_lookup_acl(sport, i_port_id);
2393 spin_unlock_irq(&sport->port_acl_lock);
2394
2395 return nacl;
2396}
2397
2398/**
2399 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
2400 *
2401 * Ownership of the cm_id is transferred to the target session if this
2402 * functions returns zero. Otherwise the caller remains the owner of cm_id.
2403 */
2404static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
2405 struct ib_cm_req_event_param *param,
2406 void *private_data)
2407{
2408 struct srpt_device *sdev = cm_id->context;
2409 struct srpt_port *sport = &sdev->port[param->port - 1];
2410 struct srp_login_req *req;
2411 struct srp_login_rsp *rsp;
2412 struct srp_login_rej *rej;
2413 struct ib_cm_rep_param *rep_param;
2414 struct srpt_rdma_ch *ch, *tmp_ch;
2415 struct srpt_node_acl *nacl;
2416 u32 it_iu_len;
2417 int i;
2418 int ret = 0;
2419
2420 WARN_ON_ONCE(irqs_disabled());
2421
2422 if (WARN_ON(!sdev || !private_data))
2423 return -EINVAL;
2424
2425 req = (struct srp_login_req *)private_data;
2426
2427 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2428
2429 printk(KERN_INFO "Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
2430 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
2431 " (guid=0x%llx:0x%llx)\n",
2432 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
2433 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
2434 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
2435 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
2436 it_iu_len,
2437 param->port,
2438 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
2439 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
2440
2441 rsp = kzalloc(sizeof *rsp, GFP_KERNEL);
2442 rej = kzalloc(sizeof *rej, GFP_KERNEL);
2443 rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL);
2444
2445 if (!rsp || !rej || !rep_param) {
2446 ret = -ENOMEM;
2447 goto out;
2448 }
2449
2450 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2451 rej->reason = __constant_cpu_to_be32(
2452 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2453 ret = -EINVAL;
2454 printk(KERN_ERR "rejected SRP_LOGIN_REQ because its"
2455 " length (%d bytes) is out of range (%d .. %d)\n",
2456 it_iu_len, 64, srp_max_req_size);
2457 goto reject;
2458 }
2459
2460 if (!sport->enabled) {
2461 rej->reason = __constant_cpu_to_be32(
2462 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2463 ret = -EINVAL;
2464 printk(KERN_ERR "rejected SRP_LOGIN_REQ because the target port"
2465 " has not yet been enabled\n");
2466 goto reject;
2467 }
2468
2469 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2470 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2471
2472 spin_lock_irq(&sdev->spinlock);
2473
2474 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
2475 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
2476 && !memcmp(ch->t_port_id, req->target_port_id, 16)
2477 && param->port == ch->sport->port
2478 && param->listen_id == ch->sport->sdev->cm_id
2479 && ch->cm_id) {
2480 enum rdma_ch_state ch_state;
2481
2482 ch_state = srpt_get_ch_state(ch);
2483 if (ch_state != CH_CONNECTING
2484 && ch_state != CH_LIVE)
2485 continue;
2486
2487 /* found an existing channel */
2488 pr_debug("Found existing channel %s"
2489 " cm_id= %p state= %d\n",
2490 ch->sess_name, ch->cm_id, ch_state);
2491
2492 __srpt_close_ch(ch);
2493
2494 rsp->rsp_flags =
2495 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2496 }
2497 }
2498
2499 spin_unlock_irq(&sdev->spinlock);
2500
2501 } else
2502 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2503
2504 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2505 || *(__be64 *)(req->target_port_id + 8) !=
2506 cpu_to_be64(srpt_service_guid)) {
2507 rej->reason = __constant_cpu_to_be32(
2508 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2509 ret = -ENOMEM;
2510 printk(KERN_ERR "rejected SRP_LOGIN_REQ because it"
2511 " has an invalid target port identifier.\n");
2512 goto reject;
2513 }
2514
2515 ch = kzalloc(sizeof *ch, GFP_KERNEL);
2516 if (!ch) {
2517 rej->reason = __constant_cpu_to_be32(
2518 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2519 printk(KERN_ERR "rejected SRP_LOGIN_REQ because no memory.\n");
2520 ret = -ENOMEM;
2521 goto reject;
2522 }
2523
2524 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2525 memcpy(ch->i_port_id, req->initiator_port_id, 16);
2526 memcpy(ch->t_port_id, req->target_port_id, 16);
2527 ch->sport = &sdev->port[param->port - 1];
2528 ch->cm_id = cm_id;
2529 /*
2530 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
2531 * for the SRP protocol to the command queue size.
2532 */
2533 ch->rq_size = SRPT_RQ_SIZE;
2534 spin_lock_init(&ch->spinlock);
2535 ch->state = CH_CONNECTING;
2536 INIT_LIST_HEAD(&ch->cmd_wait_list);
2537 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2538
2539 ch->ioctx_ring = (struct srpt_send_ioctx **)
2540 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2541 sizeof(*ch->ioctx_ring[0]),
2542 ch->rsp_size, DMA_TO_DEVICE);
2543 if (!ch->ioctx_ring)
2544 goto free_ch;
2545
2546 INIT_LIST_HEAD(&ch->free_list);
2547 for (i = 0; i < ch->rq_size; i++) {
2548 ch->ioctx_ring[i]->ch = ch;
2549 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2550 }
2551
2552 ret = srpt_create_ch_ib(ch);
2553 if (ret) {
2554 rej->reason = __constant_cpu_to_be32(
2555 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2556 printk(KERN_ERR "rejected SRP_LOGIN_REQ because creating"
2557 " a new RDMA channel failed.\n");
2558 goto free_ring;
2559 }
2560
2561 ret = srpt_ch_qp_rtr(ch, ch->qp);
2562 if (ret) {
2563 rej->reason = __constant_cpu_to_be32(
2564 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2565 printk(KERN_ERR "rejected SRP_LOGIN_REQ because enabling"
2566 " RTR failed (error code = %d)\n", ret);
2567 goto destroy_ib;
2568 }
2569 /*
2570 * Use the initator port identifier as the session name.
2571 */
2572 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2573 be64_to_cpu(*(__be64 *)ch->i_port_id),
2574 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2575
2576 pr_debug("registering session %s\n", ch->sess_name);
2577
2578 nacl = srpt_lookup_acl(sport, ch->i_port_id);
2579 if (!nacl) {
2580 printk(KERN_INFO "Rejected login because no ACL has been"
2581 " configured yet for initiator %s.\n", ch->sess_name);
2582 rej->reason = __constant_cpu_to_be32(
2583 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2584 goto destroy_ib;
2585 }
2586
e70beee7 2587 ch->sess = transport_init_session(TARGET_PROT_NORMAL);
3af33637 2588 if (IS_ERR(ch->sess)) {
a42d985b
BVA		 2589 rej->reason = __constant_cpu_to_be32(
2590 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2591 pr_debug("Failed to create session\n");
2592 goto deregister_session;
2593 }
2594 ch->sess->se_node_acl = &nacl->nacl;
2595 transport_register_session(&sport->port_tpg_1, &nacl->nacl, ch->sess, ch);
2596
2597 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2598 ch->sess_name, ch->cm_id);
2599
2600 /* create srp_login_response */
2601 rsp->opcode = SRP_LOGIN_RSP;
2602 rsp->tag = req->tag;
2603 rsp->max_it_iu_len = req->req_it_iu_len;
2604 rsp->max_ti_iu_len = req->req_it_iu_len;
2605 ch->max_ti_iu_len = it_iu_len;
2606 rsp->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2607 | SRP_BUF_FORMAT_INDIRECT);
2608 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2609 atomic_set(&ch->req_lim, ch->rq_size);
2610 atomic_set(&ch->req_lim_delta, 0);
2611
2612 /* create cm reply */
2613 rep_param->qp_num = ch->qp->qp_num;
2614 rep_param->private_data = (void *)rsp;
2615 rep_param->private_data_len = sizeof *rsp;
2616 rep_param->rnr_retry_count = 7;
2617 rep_param->flow_control = 1;
2618 rep_param->failover_accepted = 0;
2619 rep_param->srq = 1;
2620 rep_param->responder_resources = 4;
2621 rep_param->initiator_depth = 4;
2622
2623 ret = ib_send_cm_rep(cm_id, rep_param);
2624 if (ret) {
2625 printk(KERN_ERR "sending SRP_LOGIN_REQ response failed"
2626 " (error code = %d)\n", ret);
2627 goto release_channel;
2628 }
2629
2630 spin_lock_irq(&sdev->spinlock);
2631 list_add_tail(&ch->list, &sdev->rch_list);
2632 spin_unlock_irq(&sdev->spinlock);
2633
2634 goto out;
2635
2636release_channel:
2637 srpt_set_ch_state(ch, CH_RELEASING);
2638 transport_deregister_session_configfs(ch->sess);
2639
2640deregister_session:
2641 transport_deregister_session(ch->sess);
2642 ch->sess = NULL;
2643
2644destroy_ib:
2645 srpt_destroy_ch_ib(ch);
2646
2647free_ring:
2648 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2649 ch->sport->sdev, ch->rq_size,
2650 ch->rsp_size, DMA_TO_DEVICE);
2651free_ch:
2652 kfree(ch);
2653
2654reject:
2655 rej->opcode = SRP_LOGIN_REJ;
2656 rej->tag = req->tag;
2657 rej->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2658 | SRP_BUF_FORMAT_INDIRECT);
2659
2660 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2661 (void *)rej, sizeof *rej);
2662
2663out:
2664 kfree(rep_param);
2665 kfree(rsp);
2666 kfree(rej);
2667
2668 return ret;
2669}
2670
2671static void srpt_cm_rej_recv(struct ib_cm_id *cm_id)
2672{
2673 printk(KERN_INFO "Received IB REJ for cm_id %p.\n", cm_id);
2674 srpt_drain_channel(cm_id);
2675}
2676
2677/**
2678 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2679 *
2680 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2681 * and that the recipient may begin transmitting (RTU = ready to use).
2682 */
2683static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
2684{
2685 struct srpt_rdma_ch *ch;
2686 int ret;
2687
2688 ch = srpt_find_channel(cm_id->context, cm_id);
2689 BUG_ON(!ch);
2690
2691 if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) {
2692 struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
2693
2694 ret = srpt_ch_qp_rts(ch, ch->qp);
2695
2696 list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
2697 wait_list) {
2698 list_del(&ioctx->wait_list);
2699 srpt_handle_new_iu(ch, ioctx, NULL);
2700 }
2701 if (ret)
2702 srpt_close_ch(ch);
2703 }
2704}
2705
2706static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
2707{
2708 printk(KERN_INFO "Received IB TimeWait exit for cm_id %p.\n", cm_id);
2709 srpt_drain_channel(cm_id);
2710}
2711
2712static void srpt_cm_rep_error(struct ib_cm_id *cm_id)
2713{
2714 printk(KERN_INFO "Received IB REP error for cm_id %p.\n", cm_id);
2715 srpt_drain_channel(cm_id);
2716}
2717
2718/**
2719 * srpt_cm_dreq_recv() - Process reception of a DREQ message.
2720 */
2721static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
2722{
2723 struct srpt_rdma_ch *ch;
2724 unsigned long flags;
2725 bool send_drep = false;
2726
2727 ch = srpt_find_channel(cm_id->context, cm_id);
2728 BUG_ON(!ch);
2729
2730 pr_debug("cm_id= %p ch->state= %d\n", cm_id, srpt_get_ch_state(ch));
2731
2732 spin_lock_irqsave(&ch->spinlock, flags);
2733 switch (ch->state) {
2734 case CH_CONNECTING:
2735 case CH_LIVE:
2736 send_drep = true;
2737 ch->state = CH_DISCONNECTING;
2738 break;
2739 case CH_DISCONNECTING:
2740 case CH_DRAINING:
2741 case CH_RELEASING:
2742 WARN(true, "unexpected channel state %d\n", ch->state);
2743 break;
2744 }
2745 spin_unlock_irqrestore(&ch->spinlock, flags);
2746
2747 if (send_drep) {
2748 if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0)
2749 printk(KERN_ERR "Sending IB DREP failed.\n");
2750 printk(KERN_INFO "Received DREQ and sent DREP for session %s.\n",
2751 ch->sess_name);
2752 }
2753}
2754
2755/**
2756 * srpt_cm_drep_recv() - Process reception of a DREP message.
2757 */
2758static void srpt_cm_drep_recv(struct ib_cm_id *cm_id)
2759{
2760 printk(KERN_INFO "Received InfiniBand DREP message for cm_id %p.\n",
2761 cm_id);
2762 srpt_drain_channel(cm_id);
2763}
2764
2765/**
2766 * srpt_cm_handler() - IB connection manager callback function.
2767 *
2768 * A non-zero return value will cause the caller destroy the CM ID.
2769 *
2770 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2771 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2772 * a non-zero value in any other case will trigger a race with the
2773 * ib_destroy_cm_id() call in srpt_release_channel().
2774 */
2775static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2776{
2777 int ret;
2778
2779 ret = 0;
2780 switch (event->event) {
2781 case IB_CM_REQ_RECEIVED:
2782 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2783 event->private_data);
2784 break;
2785 case IB_CM_REJ_RECEIVED:
2786 srpt_cm_rej_recv(cm_id);
2787 break;
2788 case IB_CM_RTU_RECEIVED:
2789 case IB_CM_USER_ESTABLISHED:
2790 srpt_cm_rtu_recv(cm_id);
2791 break;
2792 case IB_CM_DREQ_RECEIVED:
2793 srpt_cm_dreq_recv(cm_id);
2794 break;
2795 case IB_CM_DREP_RECEIVED:
2796 srpt_cm_drep_recv(cm_id);
2797 break;
2798 case IB_CM_TIMEWAIT_EXIT:
2799 srpt_cm_timewait_exit(cm_id);
2800 break;
2801 case IB_CM_REP_ERROR:
2802 srpt_cm_rep_error(cm_id);
2803 break;
2804 case IB_CM_DREQ_ERROR:
2805 printk(KERN_INFO "Received IB DREQ ERROR event.\n");
2806 break;
2807 case IB_CM_MRA_RECEIVED:
2808 printk(KERN_INFO "Received IB MRA event\n");
2809 break;
2810 default:
2811 printk(KERN_ERR "received unrecognized IB CM event %d\n",
2812 event->event);
2813 break;
2814 }
2815
2816 return ret;
2817}
2818
2819/**
2820 * srpt_perform_rdmas() - Perform IB RDMA.
2821 *
2822 * Returns zero upon success or a negative number upon failure.
2823 */
2824static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
2825 struct srpt_send_ioctx *ioctx)
2826{
2827 struct ib_send_wr wr;
2828 struct ib_send_wr *bad_wr;
2829 struct rdma_iu *riu;
2830 int i;
2831 int ret;
2832 int sq_wr_avail;
2833 enum dma_data_direction dir;
2834 const int n_rdma = ioctx->n_rdma;
2835
2836 dir = ioctx->cmd.data_direction;
2837 if (dir == DMA_TO_DEVICE) {
2838 /* write */
2839 ret = -ENOMEM;
2840 sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail);
2841 if (sq_wr_avail < 0) {
2842 printk(KERN_WARNING "IB send queue full (needed %d)\n",
2843 n_rdma);
2844 goto out;
2845 }
2846 }
2847
2848 ioctx->rdma_aborted = false;
2849 ret = 0;
2850 riu = ioctx->rdma_ius;
2851 memset(&wr, 0, sizeof wr);
2852
2853 for (i = 0; i < n_rdma; ++i, ++riu) {
2854 if (dir == DMA_FROM_DEVICE) {
2855 wr.opcode = IB_WR_RDMA_WRITE;
2856 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2857 SRPT_RDMA_WRITE_LAST :
2858 SRPT_RDMA_MID,
2859 ioctx->ioctx.index);
2860 } else {
2861 wr.opcode = IB_WR_RDMA_READ;
2862 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2863 SRPT_RDMA_READ_LAST :
2864 SRPT_RDMA_MID,
2865 ioctx->ioctx.index);
2866 }
2867 wr.next = NULL;
2868 wr.wr.rdma.remote_addr = riu->raddr;
2869 wr.wr.rdma.rkey = riu->rkey;
2870 wr.num_sge = riu->sge_cnt;
2871 wr.sg_list = riu->sge;
2872
2873 /* only get completion event for the last rdma write */
2874 if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE)
2875 wr.send_flags = IB_SEND_SIGNALED;
2876
2877 ret = ib_post_send(ch->qp, &wr, &bad_wr);
2878 if (ret)
2879 break;
2880 }
2881
2882 if (ret)
2883 printk(KERN_ERR "%s[%d]: ib_post_send() returned %d for %d/%d",
2884 __func__, __LINE__, ret, i, n_rdma);
2885 if (ret && i > 0) {
2886 wr.num_sge = 0;
2887 wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
2888 wr.send_flags = IB_SEND_SIGNALED;
2889 while (ch->state == CH_LIVE &&
2890 ib_post_send(ch->qp, &wr, &bad_wr) != 0) {
2891 printk(KERN_INFO "Trying to abort failed RDMA transfer [%d]",
2892 ioctx->ioctx.index);
2893 msleep(1000);
2894 }
2895 while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) {
2896 printk(KERN_INFO "Waiting until RDMA abort finished [%d]",
2897 ioctx->ioctx.index);
2898 msleep(1000);
2899 }
2900 }
2901out:
2902 if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
2903 atomic_add(n_rdma, &ch->sq_wr_avail);
2904 return ret;
2905}
2906
2907/**
2908 * srpt_xfer_data() - Start data transfer from initiator to target.
2909 */
2910static int srpt_xfer_data(struct srpt_rdma_ch *ch,
2911 struct srpt_send_ioctx *ioctx)
2912{
2913 int ret;
2914
2915 ret = srpt_map_sg_to_ib_sge(ch, ioctx);
2916 if (ret) {
2917 printk(KERN_ERR "%s[%d] ret=%d\n", __func__, __LINE__, ret);
2918 goto out;
2919 }
2920
2921 ret = srpt_perform_rdmas(ch, ioctx);
2922 if (ret) {
2923 if (ret == -EAGAIN || ret == -ENOMEM)
2924 printk(KERN_INFO "%s[%d] queue full -- ret=%d\n",
2925 __func__, __LINE__, ret);
2926 else
2927 printk(KERN_ERR "%s[%d] fatal error -- ret=%d\n",
2928 __func__, __LINE__, ret);
2929 goto out_unmap;
2930 }
2931
2932out:
2933 return ret;
2934out_unmap:
2935 srpt_unmap_sg_to_ib_sge(ch, ioctx);
2936 goto out;
2937}
2938
2939static int srpt_write_pending_status(struct se_cmd *se_cmd)
2940{
2941 struct srpt_send_ioctx *ioctx;
2942
2943 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2944 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2945}
2946
2947/*
2948 * srpt_write_pending() - Start data transfer from initiator to target (write).
2949 */
2950static int srpt_write_pending(struct se_cmd *se_cmd)
2951{
2952 struct srpt_rdma_ch *ch;
2953 struct srpt_send_ioctx *ioctx;
2954 enum srpt_command_state new_state;
2955 enum rdma_ch_state ch_state;
2956 int ret;
2957
2958 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2959
2960 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2961 WARN_ON(new_state == SRPT_STATE_DONE);
2962
2963 ch = ioctx->ch;
2964 BUG_ON(!ch);
2965
2966 ch_state = srpt_get_ch_state(ch);
2967 switch (ch_state) {
2968 case CH_CONNECTING:
2969 WARN(true, "unexpected channel state %d\n", ch_state);
2970 ret = -EINVAL;
2971 goto out;
2972 case CH_LIVE:
2973 break;
2974 case CH_DISCONNECTING:
2975 case CH_DRAINING:
2976 case CH_RELEASING:
2977 pr_debug("cmd with tag %lld: channel disconnecting\n",
2978 ioctx->tag);
2979 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2980 ret = -EINVAL;
2981 goto out;
2982 }
2983 ret = srpt_xfer_data(ch, ioctx);
2984
2985out:
2986 return ret;
2987}
2988
2989static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2990{
2991 switch (tcm_mgmt_status) {
2992 case TMR_FUNCTION_COMPLETE:
2993 return SRP_TSK_MGMT_SUCCESS;
2994 case TMR_FUNCTION_REJECTED:
2995 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2996 }
2997 return SRP_TSK_MGMT_FAILED;
2998}
2999
3000/**
3001 * srpt_queue_response() - Transmits the response to a SCSI command.
3002 *
3003 * Callback function called by the TCM core. Must not block since it can be
3004 * invoked on the context of the IB completion handler.
3005 */
b79fafac 3006static void srpt_queue_response(struct se_cmd *cmd)
a42d985b
BVA		 3007{
3008 struct srpt_rdma_ch *ch;
3009 struct srpt_send_ioctx *ioctx;
3010 enum srpt_command_state state;
3011 unsigned long flags;
3012 int ret;
3013 enum dma_data_direction dir;
3014 int resp_len;
3015 u8 srp_tm_status;
3016
a42d985b
BVA		 3017 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3018 ch = ioctx->ch;
3019 BUG_ON(!ch);
3020
3021 spin_lock_irqsave(&ioctx->spinlock, flags);
3022 state = ioctx->state;
3023 switch (state) {
3024 case SRPT_STATE_NEW:
3025 case SRPT_STATE_DATA_IN:
3026 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
3027 break;
3028 case SRPT_STATE_MGMT:
3029 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
3030 break;
3031 default:
3032 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
3033 ch, ioctx->ioctx.index, ioctx->state);
3034 break;
3035 }
3036 spin_unlock_irqrestore(&ioctx->spinlock, flags);
3037
3038 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
3039 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
3040 atomic_inc(&ch->req_lim_delta);
3041 srpt_abort_cmd(ioctx);
b79fafac 3042 return;
a42d985b
BVA		 3043 }
3044
3045 dir = ioctx->cmd.data_direction;
3046
3047 /* For read commands, transfer the data to the initiator. */
3048 if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length &&
3049 !ioctx->queue_status_only) {
3050 ret = srpt_xfer_data(ch, ioctx);
3051 if (ret) {
3052 printk(KERN_ERR "xfer_data failed for tag %llu\n",
3053 ioctx->tag);
b79fafac 3054 return;
a42d985b
BVA		 3055 }
3056 }
3057
3058 if (state != SRPT_STATE_MGMT)
3059 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->tag,
3060 cmd->scsi_status);
3061 else {
3062 srp_tm_status
3063 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
3064 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
3065 ioctx->tag);
3066 }
3067 ret = srpt_post_send(ch, ioctx, resp_len);
3068 if (ret) {
3069 printk(KERN_ERR "sending cmd response failed for tag %llu\n",
3070 ioctx->tag);
3071 srpt_unmap_sg_to_ib_sge(ch, ioctx);
3072 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
9474b043 3073 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
a42d985b 3074 }
b79fafac 3075}
a42d985b 3076
b79fafac
JE		 3077static int srpt_queue_data_in(struct se_cmd *cmd)
3078{
3079 srpt_queue_response(cmd);
3080 return 0;
3081}
3082
3083static void srpt_queue_tm_rsp(struct se_cmd *cmd)
3084{
3085 srpt_queue_response(cmd);
a42d985b
BVA		 3086}
3087
131e6abc
NB		 3088static void srpt_aborted_task(struct se_cmd *cmd)
3089{
3090 struct srpt_send_ioctx *ioctx = container_of(cmd,
3091 struct srpt_send_ioctx, cmd);
3092
3093 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
3094}
3095
a42d985b
BVA		 3096static int srpt_queue_status(struct se_cmd *cmd)
3097{
3098 struct srpt_send_ioctx *ioctx;
3099
3100 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3101 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
3102 if (cmd->se_cmd_flags &
3103 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
3104 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
3105 ioctx->queue_status_only = true;
b79fafac
JE		 3106 srpt_queue_response(cmd);
3107 return 0;
a42d985b
BVA		 3108}
3109
3110static void srpt_refresh_port_work(struct work_struct *work)
3111{
3112 struct srpt_port *sport = container_of(work, struct srpt_port, work);
3113
3114 srpt_refresh_port(sport);
3115}
3116
3117static int srpt_ch_list_empty(struct srpt_device *sdev)
3118{
3119 int res;
3120
3121 spin_lock_irq(&sdev->spinlock);
3122 res = list_empty(&sdev->rch_list);
3123 spin_unlock_irq(&sdev->spinlock);
3124
3125 return res;
3126}
3127
3128/**
3129 * srpt_release_sdev() - Free the channel resources associated with a target.
3130 */
3131static int srpt_release_sdev(struct srpt_device *sdev)
3132{
3133 struct srpt_rdma_ch *ch, *tmp_ch;
3134 int res;
3135
3136 WARN_ON_ONCE(irqs_disabled());
3137
3138 BUG_ON(!sdev);
3139
3140 spin_lock_irq(&sdev->spinlock);
3141 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list)
3142 __srpt_close_ch(ch);
3143 spin_unlock_irq(&sdev->spinlock);
3144
3145 res = wait_event_interruptible(sdev->ch_releaseQ,
3146 srpt_ch_list_empty(sdev));
3147 if (res)
3148 printk(KERN_ERR "%s: interrupted.\n", __func__);
3149
3150 return 0;
3151}
3152
3153static struct srpt_port *__srpt_lookup_port(const char *name)
3154{
3155 struct ib_device *dev;
3156 struct srpt_device *sdev;
3157 struct srpt_port *sport;
3158 int i;
3159
3160 list_for_each_entry(sdev, &srpt_dev_list, list) {
3161 dev = sdev->device;
3162 if (!dev)
3163 continue;
3164
3165 for (i = 0; i < dev->phys_port_cnt; i++) {
3166 sport = &sdev->port[i];
3167
3168 if (!strcmp(sport->port_guid, name))
3169 return sport;
3170 }
3171 }
3172
3173 return NULL;
3174}
3175
3176static struct srpt_port *srpt_lookup_port(const char *name)
3177{
3178 struct srpt_port *sport;
3179
3180 spin_lock(&srpt_dev_lock);
3181 sport = __srpt_lookup_port(name);
3182 spin_unlock(&srpt_dev_lock);
3183
3184 return sport;
3185}
3186
3187/**
3188 * srpt_add_one() - Infiniband device addition callback function.
3189 */
3190static void srpt_add_one(struct ib_device *device)
3191{
3192 struct srpt_device *sdev;
3193 struct srpt_port *sport;
3194 struct ib_srq_init_attr srq_attr;
3195 int i;
3196
3197 pr_debug("device = %p, device->dma_ops = %p\n", device,
3198 device->dma_ops);
3199
3200 sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
3201 if (!sdev)
3202 goto err;
3203
3204 sdev->device = device;
3205 INIT_LIST_HEAD(&sdev->rch_list);
3206 init_waitqueue_head(&sdev->ch_releaseQ);
3207 spin_lock_init(&sdev->spinlock);
3208
3209 if (ib_query_device(device, &sdev->dev_attr))
3210 goto free_dev;
3211
3212 sdev->pd = ib_alloc_pd(device);
3213 if (IS_ERR(sdev->pd))
3214 goto free_dev;
3215
3216 sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
3217 if (IS_ERR(sdev->mr))
3218 goto err_pd;
3219
3220 sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr);
3221
3222 srq_attr.event_handler = srpt_srq_event;
3223 srq_attr.srq_context = (void *)sdev;
3224 srq_attr.attr.max_wr = sdev->srq_size;
3225 srq_attr.attr.max_sge = 1;
3226 srq_attr.attr.srq_limit = 0;
6f360336 3227 srq_attr.srq_type = IB_SRQT_BASIC;
a42d985b
BVA		 3228
3229 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
3230 if (IS_ERR(sdev->srq))
3231 goto err_mr;
3232
3233 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
3234 __func__, sdev->srq_size, sdev->dev_attr.max_srq_wr,
3235 device->name);
3236
3237 if (!srpt_service_guid)
3238 srpt_service_guid = be64_to_cpu(device->node_guid);
3239
3240 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3241 if (IS_ERR(sdev->cm_id))
3242 goto err_srq;
3243
3244 /* print out target login information */
3245 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3246 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
3247 srpt_service_guid, srpt_service_guid);
3248
3249 /*
3250 * We do not have a consistent service_id (ie. also id_ext of target_id)
3251 * to identify this target. We currently use the guid of the first HCA
3252 * in the system as service_id; therefore, the target_id will change
3253 * if this HCA is gone bad and replaced by different HCA
3254 */
3255 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL))
3256 goto err_cm;
3257
3258 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3259 srpt_event_handler);
3260 if (ib_register_event_handler(&sdev->event_handler))
3261 goto err_cm;
3262
3263 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
3264 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
3265 sizeof(*sdev->ioctx_ring[0]),
3266 srp_max_req_size, DMA_FROM_DEVICE);
3267 if (!sdev->ioctx_ring)
3268 goto err_event;
3269
3270 for (i = 0; i < sdev->srq_size; ++i)
3271 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
3272
f225066b 3273 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
a42d985b
BVA		 3274
3275 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3276 sport = &sdev->port[i - 1];
3277 sport->sdev = sdev;
3278 sport->port = i;
3279 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3280 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3281 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3282 INIT_WORK(&sport->work, srpt_refresh_port_work);
3283 INIT_LIST_HEAD(&sport->port_acl_list);
3284 spin_lock_init(&sport->port_acl_lock);
3285
3286 if (srpt_refresh_port(sport)) {
3287 printk(KERN_ERR "MAD registration failed for %s-%d.\n",
3288 srpt_sdev_name(sdev), i);
3289 goto err_ring;
3290 }
3291 snprintf(sport->port_guid, sizeof(sport->port_guid),
3292 "0x%016llx%016llx",
3293 be64_to_cpu(sport->gid.global.subnet_prefix),
3294 be64_to_cpu(sport->gid.global.interface_id));
3295 }
3296
3297 spin_lock(&srpt_dev_lock);
3298 list_add_tail(&sdev->list, &srpt_dev_list);
3299 spin_unlock(&srpt_dev_lock);
3300
3301out:
3302 ib_set_client_data(device, &srpt_client, sdev);
3303 pr_debug("added %s.\n", device->name);
3304 return;
3305
3306err_ring:
3307 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3308 sdev->srq_size, srp_max_req_size,
3309 DMA_FROM_DEVICE);
3310err_event:
3311 ib_unregister_event_handler(&sdev->event_handler);
3312err_cm:
3313 ib_destroy_cm_id(sdev->cm_id);
3314err_srq:
3315 ib_destroy_srq(sdev->srq);
3316err_mr:
3317 ib_dereg_mr(sdev->mr);
3318err_pd:
3319 ib_dealloc_pd(sdev->pd);
3320free_dev:
3321 kfree(sdev);
3322err:
3323 sdev = NULL;
3324 printk(KERN_INFO "%s(%s) failed.\n", __func__, device->name);
3325 goto out;
3326}
3327
3328/**
3329 * srpt_remove_one() - InfiniBand device removal callback function.
3330 */
3331static void srpt_remove_one(struct ib_device *device)
3332{
3333 struct srpt_device *sdev;
3334 int i;
3335
3336 sdev = ib_get_client_data(device, &srpt_client);
3337 if (!sdev) {
3338 printk(KERN_INFO "%s(%s): nothing to do.\n", __func__,
3339 device->name);
3340 return;
3341 }
3342
3343 srpt_unregister_mad_agent(sdev);
3344
3345 ib_unregister_event_handler(&sdev->event_handler);
3346
3347 /* Cancel any work queued by the just unregistered IB event handler. */
3348 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3349 cancel_work_sync(&sdev->port[i].work);
3350
3351 ib_destroy_cm_id(sdev->cm_id);
3352
3353 /*
3354 * Unregistering a target must happen after destroying sdev->cm_id
3355 * such that no new SRP_LOGIN_REQ information units can arrive while
3356 * destroying the target.
3357 */
3358 spin_lock(&srpt_dev_lock);
3359 list_del(&sdev->list);
3360 spin_unlock(&srpt_dev_lock);
3361 srpt_release_sdev(sdev);
3362
3363 ib_destroy_srq(sdev->srq);
3364 ib_dereg_mr(sdev->mr);
3365 ib_dealloc_pd(sdev->pd);
3366
3367 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3368 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
3369 sdev->ioctx_ring = NULL;
3370 kfree(sdev);
3371}
3372
3373static struct ib_client srpt_client = {
3374 .name = DRV_NAME,
3375 .add = srpt_add_one,
3376 .remove = srpt_remove_one
3377};
3378
3379static int srpt_check_true(struct se_portal_group *se_tpg)
3380{
3381 return 1;
3382}
3383
3384static int srpt_check_false(struct se_portal_group *se_tpg)
3385{
3386 return 0;
3387}
3388
3389static char *srpt_get_fabric_name(void)
3390{
3391 return "srpt";
3392}
3393
3394static u8 srpt_get_fabric_proto_ident(struct se_portal_group *se_tpg)
3395{
3396 return SCSI_TRANSPORTID_PROTOCOLID_SRP;
3397}
3398
3399static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3400{
3401 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3402
3403 return sport->port_guid;
3404}
3405
3406static u16 srpt_get_tag(struct se_portal_group *tpg)
3407{
3408 return 1;
3409}
3410
3411static u32 srpt_get_default_depth(struct se_portal_group *se_tpg)
3412{
3413 return 1;
3414}
3415
3416static u32 srpt_get_pr_transport_id(struct se_portal_group *se_tpg,
3417 struct se_node_acl *se_nacl,
3418 struct t10_pr_registration *pr_reg,
3419 int *format_code, unsigned char *buf)
3420{
3421 struct srpt_node_acl *nacl;
3422 struct spc_rdma_transport_id *tr_id;
3423
3424 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3425 tr_id = (void *)buf;
3426 tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP;
3427 memcpy(tr_id->i_port_id, nacl->i_port_id, sizeof(tr_id->i_port_id));
3428 return sizeof(*tr_id);
3429}
3430
3431static u32 srpt_get_pr_transport_id_len(struct se_portal_group *se_tpg,
3432 struct se_node_acl *se_nacl,
3433 struct t10_pr_registration *pr_reg,
3434 int *format_code)
3435{
3436 *format_code = 0;
3437 return sizeof(struct spc_rdma_transport_id);
3438}
3439
3440static char *srpt_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
3441 const char *buf, u32 *out_tid_len,
3442 char **port_nexus_ptr)
3443{
3444 struct spc_rdma_transport_id *tr_id;
3445
3446 *port_nexus_ptr = NULL;
3447 *out_tid_len = sizeof(struct spc_rdma_transport_id);
3448 tr_id = (void *)buf;
3449 return (char *)tr_id->i_port_id;
3450}
3451
3452static struct se_node_acl *srpt_alloc_fabric_acl(struct se_portal_group *se_tpg)
3453{
3454 struct srpt_node_acl *nacl;
3455
3456 nacl = kzalloc(sizeof(struct srpt_node_acl), GFP_KERNEL);
3457 if (!nacl) {
7367d99b 3458 printk(KERN_ERR "Unable to allocate struct srpt_node_acl\n");
a42d985b
BVA		 3459 return NULL;
3460 }
3461
3462 return &nacl->nacl;
3463}
3464
3465static void srpt_release_fabric_acl(struct se_portal_group *se_tpg,
3466 struct se_node_acl *se_nacl)
3467{
3468 struct srpt_node_acl *nacl;
3469
3470 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3471 kfree(nacl);
3472}
3473
3474static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3475{
3476 return 1;
3477}
3478
3479static void srpt_release_cmd(struct se_cmd *se_cmd)
3480{
9474b043
NB		 3481 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
3482 struct srpt_send_ioctx, cmd);
3483 struct srpt_rdma_ch *ch = ioctx->ch;
3484 unsigned long flags;
3485
3486 WARN_ON(ioctx->state != SRPT_STATE_DONE);
3487 WARN_ON(ioctx->mapped_sg_count != 0);
3488
3489 if (ioctx->n_rbuf > 1) {
3490 kfree(ioctx->rbufs);
3491 ioctx->rbufs = NULL;
3492 ioctx->n_rbuf = 0;
3493 }
3494
3495 spin_lock_irqsave(&ch->spinlock, flags);
3496 list_add(&ioctx->free_list, &ch->free_list);
3497 spin_unlock_irqrestore(&ch->spinlock, flags);
a42d985b
BVA		 3498}
3499
a42d985b
BVA		 3500/**
3501 * srpt_close_session() - Forcibly close a session.
3502 *
3503 * Callback function invoked by the TCM core to clean up sessions associated
3504 * with a node ACL when the user invokes
3505 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3506 */
3507static void srpt_close_session(struct se_session *se_sess)
3508{
3509 DECLARE_COMPLETION_ONSTACK(release_done);
3510 struct srpt_rdma_ch *ch;
3511 struct srpt_device *sdev;
3512 int res;
3513
3514 ch = se_sess->fabric_sess_ptr;
3515 WARN_ON(ch->sess != se_sess);
3516
3517 pr_debug("ch %p state %d\n", ch, srpt_get_ch_state(ch));
3518
3519 sdev = ch->sport->sdev;
3520 spin_lock_irq(&sdev->spinlock);
3521 BUG_ON(ch->release_done);
3522 ch->release_done = &release_done;
3523 __srpt_close_ch(ch);
3524 spin_unlock_irq(&sdev->spinlock);
3525
3526 res = wait_for_completion_timeout(&release_done, 60 * HZ);
3527 WARN_ON(res <= 0);
3528}
3529
a42d985b
BVA		 3530/**
3531 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
3532 *
3533 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3534 * This object represents an arbitrary integer used to uniquely identify a
3535 * particular attached remote initiator port to a particular SCSI target port
3536 * within a particular SCSI target device within a particular SCSI instance.
3537 */
3538static u32 srpt_sess_get_index(struct se_session *se_sess)
3539{
3540 return 0;
3541}
3542
3543static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3544{
3545}
3546
3547static u32 srpt_get_task_tag(struct se_cmd *se_cmd)
3548{
3549 struct srpt_send_ioctx *ioctx;
3550
3551 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3552 return ioctx->tag;
3553}
3554
3555/* Note: only used from inside debug printk's by the TCM core. */
3556static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3557{
3558 struct srpt_send_ioctx *ioctx;
3559
3560 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3561 return srpt_get_cmd_state(ioctx);
3562}
3563
a42d985b
BVA		 3564/**
3565 * srpt_parse_i_port_id() - Parse an initiator port ID.
3566 * @name: ASCII representation of a 128-bit initiator port ID.
3567 * @i_port_id: Binary 128-bit port ID.
3568 */
3569static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3570{
3571 const char *p;
3572 unsigned len, count, leading_zero_bytes;
3573 int ret, rc;
3574
3575 p = name;
3576 if (strnicmp(p, "0x", 2) == 0)
3577 p += 2;
3578 ret = -EINVAL;
3579 len = strlen(p);
3580 if (len % 2)
3581 goto out;
3582 count = min(len / 2, 16U);
3583 leading_zero_bytes = 16 - count;
3584 memset(i_port_id, 0, leading_zero_bytes);
3585 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
3586 if (rc < 0)
3587 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
3588 ret = 0;
3589out:
3590 return ret;
3591}
3592
3593/*
3594 * configfs callback function invoked for
3595 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3596 */
3597static struct se_node_acl *srpt_make_nodeacl(struct se_portal_group *tpg,
3598 struct config_group *group,
3599 const char *name)
3600{
3601 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3602 struct se_node_acl *se_nacl, *se_nacl_new;
3603 struct srpt_node_acl *nacl;
3604 int ret = 0;
3605 u32 nexus_depth = 1;
3606 u8 i_port_id[16];
3607
3608 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
3609 printk(KERN_ERR "invalid initiator port ID %s\n", name);
3610 ret = -EINVAL;
3611 goto err;
3612 }
3613
3614 se_nacl_new = srpt_alloc_fabric_acl(tpg);
3615 if (!se_nacl_new) {
3616 ret = -ENOMEM;
3617 goto err;
3618 }
3619 /*
3620 * nacl_new may be released by core_tpg_add_initiator_node_acl()
3621 * when converting a node ACL from demo mode to explict
3622 */
3623 se_nacl = core_tpg_add_initiator_node_acl(tpg, se_nacl_new, name,
3624 nexus_depth);
3625 if (IS_ERR(se_nacl)) {
3626 ret = PTR_ERR(se_nacl);
3627 goto err;
3628 }
3629 /* Locate our struct srpt_node_acl and set sdev and i_port_id. */
3630 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3631 memcpy(&nacl->i_port_id[0], &i_port_id[0], 16);
3632 nacl->sport = sport;
3633
3634 spin_lock_irq(&sport->port_acl_lock);
3635 list_add_tail(&nacl->list, &sport->port_acl_list);
3636 spin_unlock_irq(&sport->port_acl_lock);
3637
3638 return se_nacl;
3639err:
3640 return ERR_PTR(ret);
3641}
3642
3643/*
3644 * configfs callback function invoked for
3645 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3646 */
3647static void srpt_drop_nodeacl(struct se_node_acl *se_nacl)
3648{
3649 struct srpt_node_acl *nacl;
3650 struct srpt_device *sdev;
3651 struct srpt_port *sport;
3652
3653 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3654 sport = nacl->sport;
3655 sdev = sport->sdev;
3656 spin_lock_irq(&sport->port_acl_lock);
3657 list_del(&nacl->list);
3658 spin_unlock_irq(&sport->port_acl_lock);
3659 core_tpg_del_initiator_node_acl(&sport->port_tpg_1, se_nacl, 1);
3660 srpt_release_fabric_acl(NULL, se_nacl);
3661}
3662
3663static ssize_t srpt_tpg_attrib_show_srp_max_rdma_size(
3664 struct se_portal_group *se_tpg,
3665 char *page)
3666{
3667 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3668
3669 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3670}
3671
3672static ssize_t srpt_tpg_attrib_store_srp_max_rdma_size(
3673 struct se_portal_group *se_tpg,
3674 const char *page,
3675 size_t count)
3676{
3677 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3678 unsigned long val;
3679 int ret;
3680
9d8abf45 3681 ret = kstrtoul(page, 0, &val);
a42d985b 3682 if (ret < 0) {
9d8abf45 3683 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3684 return -EINVAL;
3685 }
3686 if (val > MAX_SRPT_RDMA_SIZE) {
3687 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3688 MAX_SRPT_RDMA_SIZE);
3689 return -EINVAL;
3690 }
3691 if (val < DEFAULT_MAX_RDMA_SIZE) {
3692 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3693 val, DEFAULT_MAX_RDMA_SIZE);
3694 return -EINVAL;
3695 }
3696 sport->port_attrib.srp_max_rdma_size = val;
3697
3698 return count;
3699}
3700
3701TF_TPG_ATTRIB_ATTR(srpt, srp_max_rdma_size, S_IRUGO | S_IWUSR);
3702
3703static ssize_t srpt_tpg_attrib_show_srp_max_rsp_size(
3704 struct se_portal_group *se_tpg,
3705 char *page)
3706{
3707 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3708
3709 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3710}
3711
3712static ssize_t srpt_tpg_attrib_store_srp_max_rsp_size(
3713 struct se_portal_group *se_tpg,
3714 const char *page,
3715 size_t count)
3716{
3717 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3718 unsigned long val;
3719 int ret;
3720
9d8abf45 3721 ret = kstrtoul(page, 0, &val);
a42d985b 3722 if (ret < 0) {
9d8abf45 3723 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3724 return -EINVAL;
3725 }
3726 if (val > MAX_SRPT_RSP_SIZE) {
3727 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3728 MAX_SRPT_RSP_SIZE);
3729 return -EINVAL;
3730 }
3731 if (val < MIN_MAX_RSP_SIZE) {
3732 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3733 MIN_MAX_RSP_SIZE);
3734 return -EINVAL;
3735 }
3736 sport->port_attrib.srp_max_rsp_size = val;
3737
3738 return count;
3739}
3740
3741TF_TPG_ATTRIB_ATTR(srpt, srp_max_rsp_size, S_IRUGO | S_IWUSR);
3742
3743static ssize_t srpt_tpg_attrib_show_srp_sq_size(
3744 struct se_portal_group *se_tpg,
3745 char *page)
3746{
3747 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3748
3749 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3750}
3751
3752static ssize_t srpt_tpg_attrib_store_srp_sq_size(
3753 struct se_portal_group *se_tpg,
3754 const char *page,
3755 size_t count)
3756{
3757 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3758 unsigned long val;
3759 int ret;
3760
9d8abf45 3761 ret = kstrtoul(page, 0, &val);
a42d985b 3762 if (ret < 0) {
9d8abf45 3763 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3764 return -EINVAL;
3765 }
3766 if (val > MAX_SRPT_SRQ_SIZE) {
3767 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3768 MAX_SRPT_SRQ_SIZE);
3769 return -EINVAL;
3770 }
3771 if (val < MIN_SRPT_SRQ_SIZE) {
3772 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3773 MIN_SRPT_SRQ_SIZE);
3774 return -EINVAL;
3775 }
3776 sport->port_attrib.srp_sq_size = val;
3777
3778 return count;
3779}
3780
3781TF_TPG_ATTRIB_ATTR(srpt, srp_sq_size, S_IRUGO | S_IWUSR);
3782
3783static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3784 &srpt_tpg_attrib_srp_max_rdma_size.attr,
3785 &srpt_tpg_attrib_srp_max_rsp_size.attr,
3786 &srpt_tpg_attrib_srp_sq_size.attr,
3787 NULL,
3788};
3789
3790static ssize_t srpt_tpg_show_enable(
3791 struct se_portal_group *se_tpg,
3792 char *page)
3793{
3794 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3795
3796 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3797}
3798
3799static ssize_t srpt_tpg_store_enable(
3800 struct se_portal_group *se_tpg,
3801 const char *page,
3802 size_t count)
3803{
3804 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3805 unsigned long tmp;
3806 int ret;
3807
9d8abf45 3808 ret = kstrtoul(page, 0, &tmp);
a42d985b
BVA		 3809 if (ret < 0) {
3810 printk(KERN_ERR "Unable to extract srpt_tpg_store_enable\n");
3811 return -EINVAL;
3812 }
3813
3814 if ((tmp != 0) && (tmp != 1)) {
3815 printk(KERN_ERR "Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3816 return -EINVAL;
3817 }
3818 if (tmp == 1)
3819 sport->enabled = true;
3820 else
3821 sport->enabled = false;
3822
3823 return count;
3824}
3825
3826TF_TPG_BASE_ATTR(srpt, enable, S_IRUGO | S_IWUSR);
3827
3828static struct configfs_attribute *srpt_tpg_attrs[] = {
3829 &srpt_tpg_enable.attr,
3830 NULL,
3831};
3832
3833/**
3834 * configfs callback invoked for
3835 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3836 */
3837static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3838 struct config_group *group,
3839 const char *name)
3840{
3841 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3842 int res;
3843
3844 /* Initialize sport->port_wwn and sport->port_tpg_1 */
3845 res = core_tpg_register(&srpt_target->tf_ops, &sport->port_wwn,
3846 &sport->port_tpg_1, sport, TRANSPORT_TPG_TYPE_NORMAL);
3847 if (res)
3848 return ERR_PTR(res);
3849
3850 return &sport->port_tpg_1;
3851}
3852
3853/**
3854 * configfs callback invoked for
3855 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3856 */
3857static void srpt_drop_tpg(struct se_portal_group *tpg)
3858{
3859 struct srpt_port *sport = container_of(tpg,
3860 struct srpt_port, port_tpg_1);
3861
3862 sport->enabled = false;
3863 core_tpg_deregister(&sport->port_tpg_1);
3864}
3865
3866/**
3867 * configfs callback invoked for
3868 * mkdir /sys/kernel/config/target/$driver/$port
3869 */
3870static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3871 struct config_group *group,
3872 const char *name)
3873{
3874 struct srpt_port *sport;
3875 int ret;
3876
3877 sport = srpt_lookup_port(name);
3878 pr_debug("make_tport(%s)\n", name);
3879 ret = -EINVAL;
3880 if (!sport)
3881 goto err;
3882
3883 return &sport->port_wwn;
3884
3885err:
3886 return ERR_PTR(ret);
3887}
3888
3889/**
3890 * configfs callback invoked for
3891 * rmdir /sys/kernel/config/target/$driver/$port
3892 */
3893static void srpt_drop_tport(struct se_wwn *wwn)
3894{
3895 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3896
3897 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3898}
3899
3900static ssize_t srpt_wwn_show_attr_version(struct target_fabric_configfs *tf,
3901 char *buf)
3902{
3903 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3904}
3905
3906TF_WWN_ATTR_RO(srpt, version);
3907
3908static struct configfs_attribute *srpt_wwn_attrs[] = {
3909 &srpt_wwn_version.attr,
3910 NULL,
3911};
3912
3913static struct target_core_fabric_ops srpt_template = {
3914 .get_fabric_name = srpt_get_fabric_name,
3915 .get_fabric_proto_ident = srpt_get_fabric_proto_ident,
3916 .tpg_get_wwn = srpt_get_fabric_wwn,
3917 .tpg_get_tag = srpt_get_tag,
3918 .tpg_get_default_depth = srpt_get_default_depth,
3919 .tpg_get_pr_transport_id = srpt_get_pr_transport_id,
3920 .tpg_get_pr_transport_id_len = srpt_get_pr_transport_id_len,
3921 .tpg_parse_pr_out_transport_id = srpt_parse_pr_out_transport_id,
3922 .tpg_check_demo_mode = srpt_check_false,
3923 .tpg_check_demo_mode_cache = srpt_check_true,
3924 .tpg_check_demo_mode_write_protect = srpt_check_true,
3925 .tpg_check_prod_mode_write_protect = srpt_check_false,
3926 .tpg_alloc_fabric_acl = srpt_alloc_fabric_acl,
3927 .tpg_release_fabric_acl = srpt_release_fabric_acl,
3928 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3929 .release_cmd = srpt_release_cmd,
3930 .check_stop_free = srpt_check_stop_free,
3931 .shutdown_session = srpt_shutdown_session,
3932 .close_session = srpt_close_session,
a42d985b
BVA		 3933 .sess_get_index = srpt_sess_get_index,
3934 .sess_get_initiator_sid = NULL,
3935 .write_pending = srpt_write_pending,
3936 .write_pending_status = srpt_write_pending_status,
3937 .set_default_node_attributes = srpt_set_default_node_attrs,
3938 .get_task_tag = srpt_get_task_tag,
3939 .get_cmd_state = srpt_get_tcm_cmd_state,
b79fafac 3940 .queue_data_in = srpt_queue_data_in,
a42d985b 3941 .queue_status = srpt_queue_status,
b79fafac 3942 .queue_tm_rsp = srpt_queue_tm_rsp,
131e6abc 3943 .aborted_task = srpt_aborted_task,
a42d985b
BVA		 3944 /*
3945 * Setup function pointers for generic logic in
3946 * target_core_fabric_configfs.c
3947 */
3948 .fabric_make_wwn = srpt_make_tport,
3949 .fabric_drop_wwn = srpt_drop_tport,
3950 .fabric_make_tpg = srpt_make_tpg,
3951 .fabric_drop_tpg = srpt_drop_tpg,
3952 .fabric_post_link = NULL,
3953 .fabric_pre_unlink = NULL,
3954 .fabric_make_np = NULL,
3955 .fabric_drop_np = NULL,
3956 .fabric_make_nodeacl = srpt_make_nodeacl,
3957 .fabric_drop_nodeacl = srpt_drop_nodeacl,
3958};
3959
3960/**
3961 * srpt_init_module() - Kernel module initialization.
3962 *
3963 * Note: Since ib_register_client() registers callback functions, and since at
3964 * least one of these callback functions (srpt_add_one()) calls target core
3965 * functions, this driver must be registered with the target core before
3966 * ib_register_client() is called.
3967 */
3968static int __init srpt_init_module(void)
3969{
3970 int ret;
3971
3972 ret = -EINVAL;
3973 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3974 printk(KERN_ERR "invalid value %d for kernel module parameter"
3975 " srp_max_req_size -- must be at least %d.\n",
3976 srp_max_req_size, MIN_MAX_REQ_SIZE);
3977 goto out;
3978 }
3979
3980 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3981 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3982 printk(KERN_ERR "invalid value %d for kernel module parameter"
3983 " srpt_srq_size -- must be in the range [%d..%d].\n",
3984 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3985 goto out;
3986 }
3987
a42d985b 3988 srpt_target = target_fabric_configfs_init(THIS_MODULE, "srpt");
3af33637 3989 if (IS_ERR(srpt_target)) {
a42d985b 3990 printk(KERN_ERR "couldn't register\n");
3af33637 3991 ret = PTR_ERR(srpt_target);
a42d985b
BVA		 3992 goto out;
3993 }
3994
3995 srpt_target->tf_ops = srpt_template;
3996
a42d985b
BVA		 3997 /*
3998 * Set up default attribute lists.
3999 */
4000 srpt_target->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = srpt_wwn_attrs;
4001 srpt_target->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = srpt_tpg_attrs;
4002 srpt_target->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = srpt_tpg_attrib_attrs;
4003 srpt_target->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
4004 srpt_target->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
4005 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
4006 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
4007 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
4008 srpt_target->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
4009
4010 ret = target_fabric_configfs_register(srpt_target);
4011 if (ret < 0) {
4012 printk(KERN_ERR "couldn't register\n");
4013 goto out_free_target;
4014 }
4015
4016 ret = ib_register_client(&srpt_client);
4017 if (ret) {
4018 printk(KERN_ERR "couldn't register IB client\n");
4019 goto out_unregister_target;
4020 }
4021
4022 return 0;
4023
4024out_unregister_target:
4025 target_fabric_configfs_deregister(srpt_target);
4026 srpt_target = NULL;
4027out_free_target:
4028 if (srpt_target)
4029 target_fabric_configfs_free(srpt_target);
4030out:
4031 return ret;
4032}
4033
4034static void __exit srpt_cleanup_module(void)
4035{
4036 ib_unregister_client(&srpt_client);
4037 target_fabric_configfs_deregister(srpt_target);
4038 srpt_target = NULL;
4039}
4040
4041module_init(srpt_init_module);
4042module_exit(srpt_cleanup_module);
Linux 6.x block layer and io_uring tree(s)