2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
4 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/delay.h>
39 #include "iscsi_iser.h"
41 #define ISCSI_ISER_MAX_CONN 8
42 #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
43 #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
44 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \
47 static int iser_cq_poll_limit
= 512;
49 static void iser_cq_tasklet_fn(unsigned long data
);
50 static void iser_cq_callback(struct ib_cq
*cq
, void *cq_context
);
52 static void iser_cq_event_callback(struct ib_event
*cause
, void *context
)
54 iser_err("got cq event %d \n", cause
->event
);
57 static void iser_qp_event_callback(struct ib_event
*cause
, void *context
)
59 iser_err("got qp event %d\n",cause
->event
);
62 static void iser_event_handler(struct ib_event_handler
*handler
,
63 struct ib_event
*event
)
65 iser_err("async event %d on device %s port %d\n", event
->event
,
66 event
->device
->name
, event
->element
.port_num
);
70 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
71 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
74 * returns 0 on success, -1 on failure
76 static int iser_create_device_ib_res(struct iser_device
*device
)
78 struct ib_device_attr
*dev_attr
= &device
->dev_attr
;
81 ret
= ib_query_device(device
->ib_device
, dev_attr
);
83 pr_warn("Query device failed for %s\n", device
->ib_device
->name
);
87 /* Assign function handles - based on FMR support */
88 if (device
->ib_device
->alloc_fmr
&& device
->ib_device
->dealloc_fmr
&&
89 device
->ib_device
->map_phys_fmr
&& device
->ib_device
->unmap_fmr
) {
90 iser_info("FMR supported, using FMR for registration\n");
91 device
->iser_alloc_rdma_reg_res
= iser_create_fmr_pool
;
92 device
->iser_free_rdma_reg_res
= iser_free_fmr_pool
;
93 device
->iser_reg_rdma_mem
= iser_reg_rdma_mem_fmr
;
94 device
->iser_unreg_rdma_mem
= iser_unreg_mem_fmr
;
96 if (dev_attr
->device_cap_flags
& IB_DEVICE_MEM_MGT_EXTENSIONS
) {
97 iser_info("FastReg supported, using FastReg for registration\n");
98 device
->iser_alloc_rdma_reg_res
= iser_create_fastreg_pool
;
99 device
->iser_free_rdma_reg_res
= iser_free_fastreg_pool
;
100 device
->iser_reg_rdma_mem
= iser_reg_rdma_mem_fastreg
;
101 device
->iser_unreg_rdma_mem
= iser_unreg_mem_fastreg
;
103 iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
107 device
->comps_used
= min_t(int, num_online_cpus(),
108 device
->ib_device
->num_comp_vectors
);
110 device
->comps
= kcalloc(device
->comps_used
, sizeof(*device
->comps
),
115 max_cqe
= min(ISER_MAX_CQ_LEN
, dev_attr
->max_cqe
);
117 iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n",
118 device
->comps_used
, device
->ib_device
->name
,
119 device
->ib_device
->num_comp_vectors
, max_cqe
);
121 device
->pd
= ib_alloc_pd(device
->ib_device
);
122 if (IS_ERR(device
->pd
))
125 for (i
= 0; i
< device
->comps_used
; i
++) {
126 struct iser_comp
*comp
= &device
->comps
[i
];
128 comp
->device
= device
;
129 comp
->cq
= ib_create_cq(device
->ib_device
,
131 iser_cq_event_callback
,
134 if (IS_ERR(comp
->cq
)) {
139 if (ib_req_notify_cq(comp
->cq
, IB_CQ_NEXT_COMP
))
142 tasklet_init(&comp
->tasklet
, iser_cq_tasklet_fn
,
143 (unsigned long)comp
);
146 device
->mr
= ib_get_dma_mr(device
->pd
, IB_ACCESS_LOCAL_WRITE
|
147 IB_ACCESS_REMOTE_WRITE
|
148 IB_ACCESS_REMOTE_READ
);
149 if (IS_ERR(device
->mr
))
152 INIT_IB_EVENT_HANDLER(&device
->event_handler
, device
->ib_device
,
154 if (ib_register_event_handler(&device
->event_handler
))
160 ib_dereg_mr(device
->mr
);
162 for (i
= 0; i
< device
->comps_used
; i
++)
163 tasklet_kill(&device
->comps
[i
].tasklet
);
165 for (i
= 0; i
< device
->comps_used
; i
++) {
166 struct iser_comp
*comp
= &device
->comps
[i
];
169 ib_destroy_cq(comp
->cq
);
171 ib_dealloc_pd(device
->pd
);
173 kfree(device
->comps
);
175 iser_err("failed to allocate an IB resource\n");
180 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
181 * CQ and PD created with the device associated with the adapator.
183 static void iser_free_device_ib_res(struct iser_device
*device
)
186 BUG_ON(device
->mr
== NULL
);
188 for (i
= 0; i
< device
->comps_used
; i
++) {
189 struct iser_comp
*comp
= &device
->comps
[i
];
191 tasklet_kill(&comp
->tasklet
);
192 ib_destroy_cq(comp
->cq
);
196 (void)ib_unregister_event_handler(&device
->event_handler
);
197 (void)ib_dereg_mr(device
->mr
);
198 (void)ib_dealloc_pd(device
->pd
);
200 kfree(device
->comps
);
201 device
->comps
= NULL
;
208 * iser_create_fmr_pool - Creates FMR pool and page_vector
210 * returns 0 on success, or errno code on failure
212 int iser_create_fmr_pool(struct ib_conn
*ib_conn
, unsigned cmds_max
)
214 struct iser_device
*device
= ib_conn
->device
;
215 struct ib_fmr_pool_param params
;
218 ib_conn
->fmr
.page_vec
= kmalloc(sizeof(*ib_conn
->fmr
.page_vec
) +
219 (sizeof(u64
)*(ISCSI_ISER_SG_TABLESIZE
+ 1)),
221 if (!ib_conn
->fmr
.page_vec
)
224 ib_conn
->fmr
.page_vec
->pages
= (u64
*)(ib_conn
->fmr
.page_vec
+ 1);
226 params
.page_shift
= SHIFT_4K
;
227 /* when the first/last SG element are not start/end *
228 * page aligned, the map whould be of N+1 pages */
229 params
.max_pages_per_fmr
= ISCSI_ISER_SG_TABLESIZE
+ 1;
230 /* make the pool size twice the max number of SCSI commands *
231 * the ML is expected to queue, watermark for unmap at 50% */
232 params
.pool_size
= cmds_max
* 2;
233 params
.dirty_watermark
= cmds_max
;
235 params
.flush_function
= NULL
;
236 params
.access
= (IB_ACCESS_LOCAL_WRITE
|
237 IB_ACCESS_REMOTE_WRITE
|
238 IB_ACCESS_REMOTE_READ
);
240 ib_conn
->fmr
.pool
= ib_create_fmr_pool(device
->pd
, ¶ms
);
241 if (!IS_ERR(ib_conn
->fmr
.pool
))
244 /* no FMR => no need for page_vec */
245 kfree(ib_conn
->fmr
.page_vec
);
246 ib_conn
->fmr
.page_vec
= NULL
;
248 ret
= PTR_ERR(ib_conn
->fmr
.pool
);
249 ib_conn
->fmr
.pool
= NULL
;
250 if (ret
!= -ENOSYS
) {
251 iser_err("FMR allocation failed, err %d\n", ret
);
254 iser_warn("FMRs are not supported, using unaligned mode\n");
260 * iser_free_fmr_pool - releases the FMR pool and page vec
262 void iser_free_fmr_pool(struct ib_conn
*ib_conn
)
264 iser_info("freeing conn %p fmr pool %p\n",
265 ib_conn
, ib_conn
->fmr
.pool
);
267 if (ib_conn
->fmr
.pool
!= NULL
)
268 ib_destroy_fmr_pool(ib_conn
->fmr
.pool
);
270 ib_conn
->fmr
.pool
= NULL
;
272 kfree(ib_conn
->fmr
.page_vec
);
273 ib_conn
->fmr
.page_vec
= NULL
;
277 iser_create_fastreg_desc(struct ib_device
*ib_device
, struct ib_pd
*pd
,
278 bool pi_enable
, struct fast_reg_descriptor
*desc
)
282 desc
->data_frpl
= ib_alloc_fast_reg_page_list(ib_device
,
283 ISCSI_ISER_SG_TABLESIZE
+ 1);
284 if (IS_ERR(desc
->data_frpl
)) {
285 ret
= PTR_ERR(desc
->data_frpl
);
286 iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n",
288 return PTR_ERR(desc
->data_frpl
);
291 desc
->data_mr
= ib_alloc_fast_reg_mr(pd
, ISCSI_ISER_SG_TABLESIZE
+ 1);
292 if (IS_ERR(desc
->data_mr
)) {
293 ret
= PTR_ERR(desc
->data_mr
);
294 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret
);
295 goto fast_reg_mr_failure
;
297 desc
->reg_indicators
|= ISER_DATA_KEY_VALID
;
300 struct ib_mr_init_attr mr_init_attr
= {0};
301 struct iser_pi_context
*pi_ctx
= NULL
;
303 desc
->pi_ctx
= kzalloc(sizeof(*desc
->pi_ctx
), GFP_KERNEL
);
305 iser_err("Failed to allocate pi context\n");
307 goto pi_ctx_alloc_failure
;
309 pi_ctx
= desc
->pi_ctx
;
311 pi_ctx
->prot_frpl
= ib_alloc_fast_reg_page_list(ib_device
,
312 ISCSI_ISER_SG_TABLESIZE
);
313 if (IS_ERR(pi_ctx
->prot_frpl
)) {
314 ret
= PTR_ERR(pi_ctx
->prot_frpl
);
315 iser_err("Failed to allocate prot frpl ret=%d\n",
317 goto prot_frpl_failure
;
320 pi_ctx
->prot_mr
= ib_alloc_fast_reg_mr(pd
,
321 ISCSI_ISER_SG_TABLESIZE
+ 1);
322 if (IS_ERR(pi_ctx
->prot_mr
)) {
323 ret
= PTR_ERR(pi_ctx
->prot_mr
);
324 iser_err("Failed to allocate prot frmr ret=%d\n",
326 goto prot_mr_failure
;
328 desc
->reg_indicators
|= ISER_PROT_KEY_VALID
;
330 mr_init_attr
.max_reg_descriptors
= 2;
331 mr_init_attr
.flags
|= IB_MR_SIGNATURE_EN
;
332 pi_ctx
->sig_mr
= ib_create_mr(pd
, &mr_init_attr
);
333 if (IS_ERR(pi_ctx
->sig_mr
)) {
334 ret
= PTR_ERR(pi_ctx
->sig_mr
);
335 iser_err("Failed to allocate signature enabled mr err=%d\n",
339 desc
->reg_indicators
|= ISER_SIG_KEY_VALID
;
341 desc
->reg_indicators
&= ~ISER_FASTREG_PROTECTED
;
343 iser_dbg("Create fr_desc %p page_list %p\n",
344 desc
, desc
->data_frpl
->page_list
);
348 ib_dereg_mr(desc
->pi_ctx
->prot_mr
);
350 ib_free_fast_reg_page_list(desc
->pi_ctx
->prot_frpl
);
353 pi_ctx_alloc_failure
:
354 ib_dereg_mr(desc
->data_mr
);
356 ib_free_fast_reg_page_list(desc
->data_frpl
);
362 * iser_create_fastreg_pool - Creates pool of fast_reg descriptors
363 * for fast registration work requests.
364 * returns 0 on success, or errno code on failure
366 int iser_create_fastreg_pool(struct ib_conn
*ib_conn
, unsigned cmds_max
)
368 struct iser_device
*device
= ib_conn
->device
;
369 struct fast_reg_descriptor
*desc
;
372 INIT_LIST_HEAD(&ib_conn
->fastreg
.pool
);
373 ib_conn
->fastreg
.pool_size
= 0;
374 for (i
= 0; i
< cmds_max
; i
++) {
375 desc
= kzalloc(sizeof(*desc
), GFP_KERNEL
);
377 iser_err("Failed to allocate a new fast_reg descriptor\n");
382 ret
= iser_create_fastreg_desc(device
->ib_device
, device
->pd
,
383 ib_conn
->pi_support
, desc
);
385 iser_err("Failed to create fastreg descriptor err=%d\n",
391 list_add_tail(&desc
->list
, &ib_conn
->fastreg
.pool
);
392 ib_conn
->fastreg
.pool_size
++;
398 iser_free_fastreg_pool(ib_conn
);
403 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
405 void iser_free_fastreg_pool(struct ib_conn
*ib_conn
)
407 struct fast_reg_descriptor
*desc
, *tmp
;
410 if (list_empty(&ib_conn
->fastreg
.pool
))
413 iser_info("freeing conn %p fr pool\n", ib_conn
);
415 list_for_each_entry_safe(desc
, tmp
, &ib_conn
->fastreg
.pool
, list
) {
416 list_del(&desc
->list
);
417 ib_free_fast_reg_page_list(desc
->data_frpl
);
418 ib_dereg_mr(desc
->data_mr
);
420 ib_free_fast_reg_page_list(desc
->pi_ctx
->prot_frpl
);
421 ib_dereg_mr(desc
->pi_ctx
->prot_mr
);
422 ib_destroy_mr(desc
->pi_ctx
->sig_mr
);
429 if (i
< ib_conn
->fastreg
.pool_size
)
430 iser_warn("pool still has %d regions registered\n",
431 ib_conn
->fastreg
.pool_size
- i
);
435 * iser_create_ib_conn_res - Queue-Pair (QP)
437 * returns 0 on success, -1 on failure
439 static int iser_create_ib_conn_res(struct ib_conn
*ib_conn
)
441 struct iser_conn
*iser_conn
= container_of(ib_conn
, struct iser_conn
,
443 struct iser_device
*device
;
444 struct ib_device_attr
*dev_attr
;
445 struct ib_qp_init_attr init_attr
;
447 int index
, min_index
= 0;
449 BUG_ON(ib_conn
->device
== NULL
);
451 device
= ib_conn
->device
;
452 dev_attr
= &device
->dev_attr
;
454 memset(&init_attr
, 0, sizeof init_attr
);
456 mutex_lock(&ig
.connlist_mutex
);
457 /* select the CQ with the minimal number of usages */
458 for (index
= 0; index
< device
->comps_used
; index
++) {
459 if (device
->comps
[index
].active_qps
<
460 device
->comps
[min_index
].active_qps
)
463 ib_conn
->comp
= &device
->comps
[min_index
];
464 ib_conn
->comp
->active_qps
++;
465 mutex_unlock(&ig
.connlist_mutex
);
466 iser_info("cq index %d used for ib_conn %p\n", min_index
, ib_conn
);
468 init_attr
.event_handler
= iser_qp_event_callback
;
469 init_attr
.qp_context
= (void *)ib_conn
;
470 init_attr
.send_cq
= ib_conn
->comp
->cq
;
471 init_attr
.recv_cq
= ib_conn
->comp
->cq
;
472 init_attr
.cap
.max_recv_wr
= ISER_QP_MAX_RECV_DTOS
;
473 init_attr
.cap
.max_send_sge
= 2;
474 init_attr
.cap
.max_recv_sge
= 1;
475 init_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
476 init_attr
.qp_type
= IB_QPT_RC
;
477 if (ib_conn
->pi_support
) {
478 init_attr
.cap
.max_send_wr
= ISER_QP_SIG_MAX_REQ_DTOS
+ 1;
479 init_attr
.create_flags
|= IB_QP_CREATE_SIGNATURE_EN
;
480 iser_conn
->max_cmds
=
481 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS
);
483 if (dev_attr
->max_qp_wr
> ISER_QP_MAX_REQ_DTOS
) {
484 init_attr
.cap
.max_send_wr
= ISER_QP_MAX_REQ_DTOS
+ 1;
485 iser_conn
->max_cmds
=
486 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS
);
488 init_attr
.cap
.max_send_wr
= dev_attr
->max_qp_wr
;
489 iser_conn
->max_cmds
=
490 ISER_GET_MAX_XMIT_CMDS(dev_attr
->max_qp_wr
);
491 iser_dbg("device %s supports max_send_wr %d\n",
492 device
->ib_device
->name
, dev_attr
->max_qp_wr
);
496 ret
= rdma_create_qp(ib_conn
->cma_id
, device
->pd
, &init_attr
);
500 ib_conn
->qp
= ib_conn
->cma_id
->qp
;
501 iser_info("setting conn %p cma_id %p qp %p\n",
502 ib_conn
, ib_conn
->cma_id
,
503 ib_conn
->cma_id
->qp
);
507 mutex_lock(&ig
.connlist_mutex
);
508 ib_conn
->comp
->active_qps
--;
509 mutex_unlock(&ig
.connlist_mutex
);
510 iser_err("unable to alloc mem or create resource, err %d\n", ret
);
516 * based on the resolved device node GUID see if there already allocated
517 * device for this device. If there's no such, create one.
520 struct iser_device
*iser_device_find_by_ib_device(struct rdma_cm_id
*cma_id
)
522 struct iser_device
*device
;
524 mutex_lock(&ig
.device_list_mutex
);
526 list_for_each_entry(device
, &ig
.device_list
, ig_list
)
527 /* find if there's a match using the node GUID */
528 if (device
->ib_device
->node_guid
== cma_id
->device
->node_guid
)
531 device
= kzalloc(sizeof *device
, GFP_KERNEL
);
535 /* assign this device to the device */
536 device
->ib_device
= cma_id
->device
;
537 /* init the device and link it into ig device list */
538 if (iser_create_device_ib_res(device
)) {
543 list_add(&device
->ig_list
, &ig
.device_list
);
548 mutex_unlock(&ig
.device_list_mutex
);
552 /* if there's no demand for this device, release it */
553 static void iser_device_try_release(struct iser_device
*device
)
555 mutex_lock(&ig
.device_list_mutex
);
557 iser_info("device %p refcount %d\n", device
, device
->refcount
);
558 if (!device
->refcount
) {
559 iser_free_device_ib_res(device
);
560 list_del(&device
->ig_list
);
563 mutex_unlock(&ig
.device_list_mutex
);
567 * Called with state mutex held
569 static int iser_conn_state_comp_exch(struct iser_conn
*iser_conn
,
570 enum iser_conn_state comp
,
571 enum iser_conn_state exch
)
575 ret
= (iser_conn
->state
== comp
);
577 iser_conn
->state
= exch
;
582 void iser_release_work(struct work_struct
*work
)
584 struct iser_conn
*iser_conn
;
586 iser_conn
= container_of(work
, struct iser_conn
, release_work
);
588 /* Wait for conn_stop to complete */
589 wait_for_completion(&iser_conn
->stop_completion
);
590 /* Wait for IB resouces cleanup to complete */
591 wait_for_completion(&iser_conn
->ib_completion
);
593 mutex_lock(&iser_conn
->state_mutex
);
594 iser_conn
->state
= ISER_CONN_DOWN
;
595 mutex_unlock(&iser_conn
->state_mutex
);
597 iser_conn_release(iser_conn
);
601 * iser_free_ib_conn_res - release IB related resources
602 * @iser_conn: iser connection struct
603 * @destroy: indicator if we need to try to release the
604 * iser device and memory regoins pool (only iscsi
605 * shutdown and DEVICE_REMOVAL will use this).
607 * This routine is called with the iser state mutex held
608 * so the cm_id removal is out of here. It is Safe to
609 * be invoked multiple times.
611 static void iser_free_ib_conn_res(struct iser_conn
*iser_conn
,
614 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
615 struct iser_device
*device
= ib_conn
->device
;
617 iser_info("freeing conn %p cma_id %p qp %p\n",
618 iser_conn
, ib_conn
->cma_id
, ib_conn
->qp
);
620 if (ib_conn
->qp
!= NULL
) {
621 ib_conn
->comp
->active_qps
--;
622 rdma_destroy_qp(ib_conn
->cma_id
);
627 if (iser_conn
->rx_descs
)
628 iser_free_rx_descriptors(iser_conn
);
630 if (device
!= NULL
) {
631 iser_device_try_release(device
);
632 ib_conn
->device
= NULL
;
638 * Frees all conn objects and deallocs conn descriptor
640 void iser_conn_release(struct iser_conn
*iser_conn
)
642 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
644 mutex_lock(&ig
.connlist_mutex
);
645 list_del(&iser_conn
->conn_list
);
646 mutex_unlock(&ig
.connlist_mutex
);
648 mutex_lock(&iser_conn
->state_mutex
);
649 /* In case we endup here without ep_disconnect being invoked. */
650 if (iser_conn
->state
!= ISER_CONN_DOWN
) {
651 iser_warn("iser conn %p state %d, expected state down.\n",
652 iser_conn
, iser_conn
->state
);
653 iscsi_destroy_endpoint(iser_conn
->ep
);
654 iser_conn
->state
= ISER_CONN_DOWN
;
657 * In case we never got to bind stage, we still need to
658 * release IB resources (which is safe to call more than once).
660 iser_free_ib_conn_res(iser_conn
, true);
661 mutex_unlock(&iser_conn
->state_mutex
);
663 if (ib_conn
->cma_id
!= NULL
) {
664 rdma_destroy_id(ib_conn
->cma_id
);
665 ib_conn
->cma_id
= NULL
;
672 * triggers start of the disconnect procedures and wait for them to be done
673 * Called with state mutex held
675 int iser_conn_terminate(struct iser_conn
*iser_conn
)
677 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
678 struct ib_send_wr
*bad_wr
;
681 /* terminate the iser conn only if the conn state is UP */
682 if (!iser_conn_state_comp_exch(iser_conn
, ISER_CONN_UP
,
683 ISER_CONN_TERMINATING
))
686 iser_info("iser_conn %p state %d\n", iser_conn
, iser_conn
->state
);
688 /* suspend queuing of new iscsi commands */
689 if (iser_conn
->iscsi_conn
)
690 iscsi_suspend_queue(iser_conn
->iscsi_conn
);
693 * In case we didn't already clean up the cma_id (peer initiated
694 * a disconnection), we need to Cause the CMA to change the QP
697 if (ib_conn
->cma_id
) {
698 err
= rdma_disconnect(ib_conn
->cma_id
);
700 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
703 /* post an indication that all flush errors were consumed */
704 err
= ib_post_send(ib_conn
->qp
, &ib_conn
->beacon
, &bad_wr
);
706 iser_err("conn %p failed to post beacon", ib_conn
);
710 wait_for_completion(&ib_conn
->flush_comp
);
717 * Called with state mutex held
719 static void iser_connect_error(struct rdma_cm_id
*cma_id
)
721 struct iser_conn
*iser_conn
;
723 iser_conn
= (struct iser_conn
*)cma_id
->context
;
724 iser_conn
->state
= ISER_CONN_TERMINATING
;
728 * Called with state mutex held
730 static void iser_addr_handler(struct rdma_cm_id
*cma_id
)
732 struct iser_device
*device
;
733 struct iser_conn
*iser_conn
;
734 struct ib_conn
*ib_conn
;
737 iser_conn
= (struct iser_conn
*)cma_id
->context
;
738 if (iser_conn
->state
!= ISER_CONN_PENDING
)
742 ib_conn
= &iser_conn
->ib_conn
;
743 device
= iser_device_find_by_ib_device(cma_id
);
745 iser_err("device lookup/creation failed\n");
746 iser_connect_error(cma_id
);
750 ib_conn
->device
= device
;
752 /* connection T10-PI support */
753 if (iser_pi_enable
) {
754 if (!(device
->dev_attr
.device_cap_flags
&
755 IB_DEVICE_SIGNATURE_HANDOVER
)) {
756 iser_warn("T10-PI requested but not supported on %s, "
757 "continue without T10-PI\n",
758 ib_conn
->device
->ib_device
->name
);
759 ib_conn
->pi_support
= false;
761 ib_conn
->pi_support
= true;
765 ret
= rdma_resolve_route(cma_id
, 1000);
767 iser_err("resolve route failed: %d\n", ret
);
768 iser_connect_error(cma_id
);
774 * Called with state mutex held
776 static void iser_route_handler(struct rdma_cm_id
*cma_id
)
778 struct rdma_conn_param conn_param
;
780 struct iser_cm_hdr req_hdr
;
781 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
782 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
783 struct iser_device
*device
= ib_conn
->device
;
785 if (iser_conn
->state
!= ISER_CONN_PENDING
)
789 ret
= iser_create_ib_conn_res(ib_conn
);
793 memset(&conn_param
, 0, sizeof conn_param
);
794 conn_param
.responder_resources
= device
->dev_attr
.max_qp_rd_atom
;
795 conn_param
.initiator_depth
= 1;
796 conn_param
.retry_count
= 7;
797 conn_param
.rnr_retry_count
= 6;
799 memset(&req_hdr
, 0, sizeof(req_hdr
));
800 req_hdr
.flags
= (ISER_ZBVA_NOT_SUPPORTED
|
801 ISER_SEND_W_INV_NOT_SUPPORTED
);
802 conn_param
.private_data
= (void *)&req_hdr
;
803 conn_param
.private_data_len
= sizeof(struct iser_cm_hdr
);
805 ret
= rdma_connect(cma_id
, &conn_param
);
807 iser_err("failure connecting: %d\n", ret
);
813 iser_connect_error(cma_id
);
816 static void iser_connected_handler(struct rdma_cm_id
*cma_id
)
818 struct iser_conn
*iser_conn
;
819 struct ib_qp_attr attr
;
820 struct ib_qp_init_attr init_attr
;
822 iser_conn
= (struct iser_conn
*)cma_id
->context
;
823 if (iser_conn
->state
!= ISER_CONN_PENDING
)
827 (void)ib_query_qp(cma_id
->qp
, &attr
, ~0, &init_attr
);
828 iser_info("remote qpn:%x my qpn:%x\n", attr
.dest_qp_num
, cma_id
->qp
->qp_num
);
830 iser_conn
->state
= ISER_CONN_UP
;
831 complete(&iser_conn
->up_completion
);
834 static void iser_disconnected_handler(struct rdma_cm_id
*cma_id
)
836 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
838 if (iser_conn_terminate(iser_conn
)) {
839 if (iser_conn
->iscsi_conn
)
840 iscsi_conn_failure(iser_conn
->iscsi_conn
,
841 ISCSI_ERR_CONN_FAILED
);
843 iser_err("iscsi_iser connection isn't bound\n");
847 static void iser_cleanup_handler(struct rdma_cm_id
*cma_id
,
850 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
853 * We are not guaranteed that we visited disconnected_handler
854 * by now, call it here to be safe that we handle CM drep
857 iser_disconnected_handler(cma_id
);
858 iser_free_ib_conn_res(iser_conn
, destroy
);
859 complete(&iser_conn
->ib_completion
);
862 static int iser_cma_handler(struct rdma_cm_id
*cma_id
, struct rdma_cm_event
*event
)
864 struct iser_conn
*iser_conn
;
867 iser_conn
= (struct iser_conn
*)cma_id
->context
;
868 iser_info("event %d status %d conn %p id %p\n",
869 event
->event
, event
->status
, cma_id
->context
, cma_id
);
871 mutex_lock(&iser_conn
->state_mutex
);
872 switch (event
->event
) {
873 case RDMA_CM_EVENT_ADDR_RESOLVED
:
874 iser_addr_handler(cma_id
);
876 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
877 iser_route_handler(cma_id
);
879 case RDMA_CM_EVENT_ESTABLISHED
:
880 iser_connected_handler(cma_id
);
882 case RDMA_CM_EVENT_ADDR_ERROR
:
883 case RDMA_CM_EVENT_ROUTE_ERROR
:
884 case RDMA_CM_EVENT_CONNECT_ERROR
:
885 case RDMA_CM_EVENT_UNREACHABLE
:
886 case RDMA_CM_EVENT_REJECTED
:
887 iser_connect_error(cma_id
);
889 case RDMA_CM_EVENT_DISCONNECTED
:
890 case RDMA_CM_EVENT_ADDR_CHANGE
:
891 case RDMA_CM_EVENT_TIMEWAIT_EXIT
:
892 iser_cleanup_handler(cma_id
, false);
894 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
896 * we *must* destroy the device as we cannot rely
897 * on iscsid to be around to initiate error handling.
898 * also if we are not in state DOWN implicitly destroy
901 iser_cleanup_handler(cma_id
, true);
902 if (iser_conn
->state
!= ISER_CONN_DOWN
) {
903 iser_conn
->ib_conn
.cma_id
= NULL
;
908 iser_err("Unexpected RDMA CM event (%d)\n", event
->event
);
911 mutex_unlock(&iser_conn
->state_mutex
);
916 void iser_conn_init(struct iser_conn
*iser_conn
)
918 iser_conn
->state
= ISER_CONN_INIT
;
919 iser_conn
->ib_conn
.post_recv_buf_count
= 0;
920 init_completion(&iser_conn
->ib_conn
.flush_comp
);
921 init_completion(&iser_conn
->stop_completion
);
922 init_completion(&iser_conn
->ib_completion
);
923 init_completion(&iser_conn
->up_completion
);
924 INIT_LIST_HEAD(&iser_conn
->conn_list
);
925 spin_lock_init(&iser_conn
->ib_conn
.lock
);
926 mutex_init(&iser_conn
->state_mutex
);
930 * starts the process of connecting to the target
931 * sleeps until the connection is established or rejected
933 int iser_connect(struct iser_conn
*iser_conn
,
934 struct sockaddr
*src_addr
,
935 struct sockaddr
*dst_addr
,
938 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
941 mutex_lock(&iser_conn
->state_mutex
);
943 sprintf(iser_conn
->name
, "%pISp", dst_addr
);
945 iser_info("connecting to: %s\n", iser_conn
->name
);
947 /* the device is known only --after-- address resolution */
948 ib_conn
->device
= NULL
;
950 iser_conn
->state
= ISER_CONN_PENDING
;
952 ib_conn
->beacon
.wr_id
= ISER_BEACON_WRID
;
953 ib_conn
->beacon
.opcode
= IB_WR_SEND
;
955 ib_conn
->cma_id
= rdma_create_id(iser_cma_handler
,
957 RDMA_PS_TCP
, IB_QPT_RC
);
958 if (IS_ERR(ib_conn
->cma_id
)) {
959 err
= PTR_ERR(ib_conn
->cma_id
);
960 iser_err("rdma_create_id failed: %d\n", err
);
964 err
= rdma_resolve_addr(ib_conn
->cma_id
, src_addr
, dst_addr
, 1000);
966 iser_err("rdma_resolve_addr failed: %d\n", err
);
971 wait_for_completion_interruptible(&iser_conn
->up_completion
);
973 if (iser_conn
->state
!= ISER_CONN_UP
) {
975 goto connect_failure
;
978 mutex_unlock(&iser_conn
->state_mutex
);
980 mutex_lock(&ig
.connlist_mutex
);
981 list_add(&iser_conn
->conn_list
, &ig
.connlist
);
982 mutex_unlock(&ig
.connlist_mutex
);
986 ib_conn
->cma_id
= NULL
;
988 iser_conn
->state
= ISER_CONN_DOWN
;
990 mutex_unlock(&iser_conn
->state_mutex
);
991 iser_conn_release(iser_conn
);
996 * iser_reg_page_vec - Register physical memory
998 * returns: 0 on success, errno code on failure
1000 int iser_reg_page_vec(struct ib_conn
*ib_conn
,
1001 struct iser_page_vec
*page_vec
,
1002 struct iser_mem_reg
*mem_reg
)
1004 struct ib_pool_fmr
*mem
;
1009 page_list
= page_vec
->pages
;
1010 io_addr
= page_list
[0];
1012 mem
= ib_fmr_pool_map_phys(ib_conn
->fmr
.pool
,
1018 status
= (int)PTR_ERR(mem
);
1019 iser_err("ib_fmr_pool_map_phys failed: %d\n", status
);
1023 mem_reg
->lkey
= mem
->fmr
->lkey
;
1024 mem_reg
->rkey
= mem
->fmr
->rkey
;
1025 mem_reg
->len
= page_vec
->length
* SIZE_4K
;
1026 mem_reg
->va
= io_addr
;
1027 mem_reg
->mem_h
= (void *)mem
;
1029 mem_reg
->va
+= page_vec
->offset
;
1030 mem_reg
->len
= page_vec
->data_size
;
1032 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
1033 "entry[0]: (0x%08lx,%ld)] -> "
1034 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
1035 page_vec
, page_vec
->length
,
1036 (unsigned long)page_vec
->pages
[0],
1037 (unsigned long)page_vec
->data_size
,
1038 (unsigned int)mem_reg
->lkey
, mem_reg
->mem_h
,
1039 (unsigned long)mem_reg
->va
, (unsigned long)mem_reg
->len
);
1044 * Unregister (previosuly registered using FMR) memory.
1045 * If memory is non-FMR does nothing.
1047 void iser_unreg_mem_fmr(struct iscsi_iser_task
*iser_task
,
1048 enum iser_data_dir cmd_dir
)
1050 struct iser_mem_reg
*reg
= &iser_task
->rdma_regd
[cmd_dir
].reg
;
1056 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg
->mem_h
);
1058 ret
= ib_fmr_pool_unmap((struct ib_pool_fmr
*)reg
->mem_h
);
1060 iser_err("ib_fmr_pool_unmap failed %d\n", ret
);
1065 void iser_unreg_mem_fastreg(struct iscsi_iser_task
*iser_task
,
1066 enum iser_data_dir cmd_dir
)
1068 struct iser_mem_reg
*reg
= &iser_task
->rdma_regd
[cmd_dir
].reg
;
1069 struct iser_conn
*iser_conn
= iser_task
->iser_conn
;
1070 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
1071 struct fast_reg_descriptor
*desc
= reg
->mem_h
;
1077 spin_lock_bh(&ib_conn
->lock
);
1078 list_add_tail(&desc
->list
, &ib_conn
->fastreg
.pool
);
1079 spin_unlock_bh(&ib_conn
->lock
);
1082 int iser_post_recvl(struct iser_conn
*iser_conn
)
1084 struct ib_recv_wr rx_wr
, *rx_wr_failed
;
1085 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
1089 sge
.addr
= iser_conn
->login_resp_dma
;
1090 sge
.length
= ISER_RX_LOGIN_SIZE
;
1091 sge
.lkey
= ib_conn
->device
->mr
->lkey
;
1093 rx_wr
.wr_id
= (uintptr_t)iser_conn
->login_resp_buf
;
1094 rx_wr
.sg_list
= &sge
;
1098 ib_conn
->post_recv_buf_count
++;
1099 ib_ret
= ib_post_recv(ib_conn
->qp
, &rx_wr
, &rx_wr_failed
);
1101 iser_err("ib_post_recv failed ret=%d\n", ib_ret
);
1102 ib_conn
->post_recv_buf_count
--;
1107 int iser_post_recvm(struct iser_conn
*iser_conn
, int count
)
1109 struct ib_recv_wr
*rx_wr
, *rx_wr_failed
;
1111 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
1112 unsigned int my_rx_head
= iser_conn
->rx_desc_head
;
1113 struct iser_rx_desc
*rx_desc
;
1115 for (rx_wr
= ib_conn
->rx_wr
, i
= 0; i
< count
; i
++, rx_wr
++) {
1116 rx_desc
= &iser_conn
->rx_descs
[my_rx_head
];
1117 rx_wr
->wr_id
= (uintptr_t)rx_desc
;
1118 rx_wr
->sg_list
= &rx_desc
->rx_sg
;
1120 rx_wr
->next
= rx_wr
+ 1;
1121 my_rx_head
= (my_rx_head
+ 1) & iser_conn
->qp_max_recv_dtos_mask
;
1125 rx_wr
->next
= NULL
; /* mark end of work requests list */
1127 ib_conn
->post_recv_buf_count
+= count
;
1128 ib_ret
= ib_post_recv(ib_conn
->qp
, ib_conn
->rx_wr
, &rx_wr_failed
);
1130 iser_err("ib_post_recv failed ret=%d\n", ib_ret
);
1131 ib_conn
->post_recv_buf_count
-= count
;
1133 iser_conn
->rx_desc_head
= my_rx_head
;
1139 * iser_start_send - Initiate a Send DTO operation
1141 * returns 0 on success, -1 on failure
1143 int iser_post_send(struct ib_conn
*ib_conn
, struct iser_tx_desc
*tx_desc
,
1147 struct ib_send_wr send_wr
, *send_wr_failed
;
1149 ib_dma_sync_single_for_device(ib_conn
->device
->ib_device
,
1150 tx_desc
->dma_addr
, ISER_HEADERS_LEN
,
1153 send_wr
.next
= NULL
;
1154 send_wr
.wr_id
= (uintptr_t)tx_desc
;
1155 send_wr
.sg_list
= tx_desc
->tx_sg
;
1156 send_wr
.num_sge
= tx_desc
->num_sge
;
1157 send_wr
.opcode
= IB_WR_SEND
;
1158 send_wr
.send_flags
= signal
? IB_SEND_SIGNALED
: 0;
1160 ib_ret
= ib_post_send(ib_conn
->qp
, &send_wr
, &send_wr_failed
);
1162 iser_err("ib_post_send failed, ret:%d\n", ib_ret
);
1168 * is_iser_tx_desc - Indicate if the completion wr_id
1169 * is a TX descriptor or not.
1170 * @iser_conn: iser connection
1171 * @wr_id: completion WR identifier
1173 * Since we cannot rely on wc opcode in FLUSH errors
1174 * we must work around it by checking if the wr_id address
1175 * falls in the iser connection rx_descs buffer. If so
1176 * it is an RX descriptor, otherwize it is a TX.
1179 is_iser_tx_desc(struct iser_conn
*iser_conn
, void *wr_id
)
1181 void *start
= iser_conn
->rx_descs
;
1182 int len
= iser_conn
->num_rx_descs
* sizeof(*iser_conn
->rx_descs
);
1184 if (wr_id
>= start
&& wr_id
< start
+ len
)
1191 * iser_handle_comp_error() - Handle error completion
1192 * @ib_conn: connection RDMA resources
1193 * @wc: work completion
1195 * Notes: We may handle a FLUSH error completion and in this case
1196 * we only cleanup in case TX type was DATAOUT. For non-FLUSH
1197 * error completion we should also notify iscsi layer that
1198 * connection is failed (in case we passed bind stage).
1201 iser_handle_comp_error(struct ib_conn
*ib_conn
,
1204 void *wr_id
= (void *)(uintptr_t)wc
->wr_id
;
1205 struct iser_conn
*iser_conn
= container_of(ib_conn
, struct iser_conn
,
1208 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
1209 if (iser_conn
->iscsi_conn
)
1210 iscsi_conn_failure(iser_conn
->iscsi_conn
,
1211 ISCSI_ERR_CONN_FAILED
);
1213 if (is_iser_tx_desc(iser_conn
, wr_id
)) {
1214 struct iser_tx_desc
*desc
= wr_id
;
1216 if (desc
->type
== ISCSI_TX_DATAOUT
)
1217 kmem_cache_free(ig
.desc_cache
, desc
);
1219 ib_conn
->post_recv_buf_count
--;
1224 * iser_handle_wc - handle a single work completion
1225 * @wc: work completion
1227 * Soft-IRQ context, work completion can be either
1228 * SEND or RECV, and can turn out successful or
1229 * with error (or flush error).
1231 static void iser_handle_wc(struct ib_wc
*wc
)
1233 struct ib_conn
*ib_conn
;
1234 struct iser_tx_desc
*tx_desc
;
1235 struct iser_rx_desc
*rx_desc
;
1237 ib_conn
= wc
->qp
->qp_context
;
1238 if (likely(wc
->status
== IB_WC_SUCCESS
)) {
1239 if (wc
->opcode
== IB_WC_RECV
) {
1240 rx_desc
= (struct iser_rx_desc
*)(uintptr_t)wc
->wr_id
;
1241 iser_rcv_completion(rx_desc
, wc
->byte_len
,
1244 if (wc
->opcode
== IB_WC_SEND
) {
1245 tx_desc
= (struct iser_tx_desc
*)(uintptr_t)wc
->wr_id
;
1246 iser_snd_completion(tx_desc
, ib_conn
);
1248 iser_err("Unknown wc opcode %d\n", wc
->opcode
);
1251 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
1252 iser_err("wr id %llx status %d vend_err %x\n",
1253 wc
->wr_id
, wc
->status
, wc
->vendor_err
);
1255 iser_dbg("flush error: wr id %llx\n", wc
->wr_id
);
1257 if (wc
->wr_id
!= ISER_FASTREG_LI_WRID
&&
1258 wc
->wr_id
!= ISER_BEACON_WRID
)
1259 iser_handle_comp_error(ib_conn
, wc
);
1261 /* complete in case all flush errors were consumed */
1262 if (wc
->wr_id
== ISER_BEACON_WRID
)
1263 complete(&ib_conn
->flush_comp
);
1268 * iser_cq_tasklet_fn - iSER completion polling loop
1269 * @data: iSER completion context
1271 * Soft-IRQ context, polling connection CQ until
1272 * either CQ was empty or we exausted polling budget
1274 static void iser_cq_tasklet_fn(unsigned long data
)
1276 struct iser_comp
*comp
= (struct iser_comp
*)data
;
1277 struct ib_cq
*cq
= comp
->cq
;
1278 struct ib_wc
*const wcs
= comp
->wcs
;
1279 int i
, n
, completed
= 0;
1281 while ((n
= ib_poll_cq(cq
, ARRAY_SIZE(comp
->wcs
), wcs
)) > 0) {
1282 for (i
= 0; i
< n
; i
++)
1283 iser_handle_wc(&wcs
[i
]);
1286 if (completed
>= iser_cq_poll_limit
)
1291 * It is assumed here that arming CQ only once its empty
1292 * would not cause interrupts to be missed.
1294 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1296 iser_dbg("got %d completions\n", completed
);
1299 static void iser_cq_callback(struct ib_cq
*cq
, void *cq_context
)
1301 struct iser_comp
*comp
= cq_context
;
1303 tasklet_schedule(&comp
->tasklet
);
1306 u8
iser_check_task_pi_status(struct iscsi_iser_task
*iser_task
,
1307 enum iser_data_dir cmd_dir
, sector_t
*sector
)
1309 struct iser_mem_reg
*reg
= &iser_task
->rdma_regd
[cmd_dir
].reg
;
1310 struct fast_reg_descriptor
*desc
= reg
->mem_h
;
1311 unsigned long sector_size
= iser_task
->sc
->device
->sector_size
;
1312 struct ib_mr_status mr_status
;
1315 if (desc
&& desc
->reg_indicators
& ISER_FASTREG_PROTECTED
) {
1316 desc
->reg_indicators
&= ~ISER_FASTREG_PROTECTED
;
1317 ret
= ib_check_mr_status(desc
->pi_ctx
->sig_mr
,
1318 IB_MR_CHECK_SIG_STATUS
, &mr_status
);
1320 pr_err("ib_check_mr_status failed, ret %d\n", ret
);
1324 if (mr_status
.fail_status
& IB_MR_CHECK_SIG_STATUS
) {
1325 sector_t sector_off
= mr_status
.sig_err
.sig_err_offset
;
1327 do_div(sector_off
, sector_size
+ 8);
1328 *sector
= scsi_get_lba(iser_task
->sc
) + sector_off
;
1330 pr_err("PI error found type %d at sector %llx "
1331 "expected %x vs actual %x\n",
1332 mr_status
.sig_err
.err_type
,
1333 (unsigned long long)*sector
,
1334 mr_status
.sig_err
.expected
,
1335 mr_status
.sig_err
.actual
);
1337 switch (mr_status
.sig_err
.err_type
) {
1338 case IB_SIG_BAD_GUARD
:
1340 case IB_SIG_BAD_REFTAG
:
1342 case IB_SIG_BAD_APPTAG
:
1350 /* Not alot we can do here, return ambiguous guard error */