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("cq event %s (%d)\n",
55 ib_event_msg(cause
->event
), cause
->event
);
58 static void iser_qp_event_callback(struct ib_event
*cause
, void *context
)
60 iser_err("qp event %s (%d)\n",
61 ib_event_msg(cause
->event
), cause
->event
);
64 static void iser_event_handler(struct ib_event_handler
*handler
,
65 struct ib_event
*event
)
67 iser_err("async event %s (%d) on device %s port %d\n",
68 ib_event_msg(event
->event
), event
->event
,
69 event
->device
->name
, event
->element
.port_num
);
73 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
74 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
77 * returns 0 on success, -1 on failure
79 static int iser_create_device_ib_res(struct iser_device
*device
)
81 struct ib_device_attr
*dev_attr
= &device
->dev_attr
;
84 ret
= ib_query_device(device
->ib_device
, dev_attr
);
86 pr_warn("Query device failed for %s\n", device
->ib_device
->name
);
90 ret
= iser_assign_reg_ops(device
);
94 device
->comps_used
= min_t(int, num_online_cpus(),
95 device
->ib_device
->num_comp_vectors
);
97 device
->comps
= kcalloc(device
->comps_used
, sizeof(*device
->comps
),
102 max_cqe
= min(ISER_MAX_CQ_LEN
, dev_attr
->max_cqe
);
104 iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n",
105 device
->comps_used
, device
->ib_device
->name
,
106 device
->ib_device
->num_comp_vectors
, max_cqe
);
108 device
->pd
= ib_alloc_pd(device
->ib_device
);
109 if (IS_ERR(device
->pd
))
112 for (i
= 0; i
< device
->comps_used
; i
++) {
113 struct ib_cq_init_attr cq_attr
= {};
114 struct iser_comp
*comp
= &device
->comps
[i
];
116 comp
->device
= device
;
117 cq_attr
.cqe
= max_cqe
;
118 cq_attr
.comp_vector
= i
;
119 comp
->cq
= ib_create_cq(device
->ib_device
,
121 iser_cq_event_callback
,
124 if (IS_ERR(comp
->cq
)) {
129 if (ib_req_notify_cq(comp
->cq
, IB_CQ_NEXT_COMP
))
132 tasklet_init(&comp
->tasklet
, iser_cq_tasklet_fn
,
133 (unsigned long)comp
);
136 if (!iser_always_reg
) {
137 int access
= IB_ACCESS_LOCAL_WRITE
|
138 IB_ACCESS_REMOTE_WRITE
|
139 IB_ACCESS_REMOTE_READ
;
141 device
->mr
= ib_get_dma_mr(device
->pd
, access
);
142 if (IS_ERR(device
->mr
))
146 INIT_IB_EVENT_HANDLER(&device
->event_handler
, device
->ib_device
,
148 if (ib_register_event_handler(&device
->event_handler
))
155 ib_dereg_mr(device
->mr
);
157 for (i
= 0; i
< device
->comps_used
; i
++)
158 tasklet_kill(&device
->comps
[i
].tasklet
);
160 for (i
= 0; i
< device
->comps_used
; i
++) {
161 struct iser_comp
*comp
= &device
->comps
[i
];
164 ib_destroy_cq(comp
->cq
);
166 ib_dealloc_pd(device
->pd
);
168 kfree(device
->comps
);
170 iser_err("failed to allocate an IB resource\n");
175 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
176 * CQ and PD created with the device associated with the adapator.
178 static void iser_free_device_ib_res(struct iser_device
*device
)
182 for (i
= 0; i
< device
->comps_used
; i
++) {
183 struct iser_comp
*comp
= &device
->comps
[i
];
185 tasklet_kill(&comp
->tasklet
);
186 ib_destroy_cq(comp
->cq
);
190 (void)ib_unregister_event_handler(&device
->event_handler
);
192 (void)ib_dereg_mr(device
->mr
);
193 ib_dealloc_pd(device
->pd
);
195 kfree(device
->comps
);
196 device
->comps
= NULL
;
203 * iser_alloc_fmr_pool - Creates FMR pool and page_vector
205 * returns 0 on success, or errno code on failure
207 int iser_alloc_fmr_pool(struct ib_conn
*ib_conn
,
211 struct iser_device
*device
= ib_conn
->device
;
212 struct iser_fr_pool
*fr_pool
= &ib_conn
->fr_pool
;
213 struct iser_page_vec
*page_vec
;
214 struct iser_fr_desc
*desc
;
215 struct ib_fmr_pool
*fmr_pool
;
216 struct ib_fmr_pool_param params
;
219 INIT_LIST_HEAD(&fr_pool
->list
);
220 spin_lock_init(&fr_pool
->lock
);
222 desc
= kzalloc(sizeof(*desc
), GFP_KERNEL
);
226 page_vec
= kmalloc(sizeof(*page_vec
) + (sizeof(u64
) * size
),
233 page_vec
->pages
= (u64
*)(page_vec
+ 1);
235 params
.page_shift
= SHIFT_4K
;
236 params
.max_pages_per_fmr
= size
;
237 /* make the pool size twice the max number of SCSI commands *
238 * the ML is expected to queue, watermark for unmap at 50% */
239 params
.pool_size
= cmds_max
* 2;
240 params
.dirty_watermark
= cmds_max
;
242 params
.flush_function
= NULL
;
243 params
.access
= (IB_ACCESS_LOCAL_WRITE
|
244 IB_ACCESS_REMOTE_WRITE
|
245 IB_ACCESS_REMOTE_READ
);
247 fmr_pool
= ib_create_fmr_pool(device
->pd
, ¶ms
);
248 if (IS_ERR(fmr_pool
)) {
249 ret
= PTR_ERR(fmr_pool
);
250 iser_err("FMR allocation failed, err %d\n", ret
);
254 desc
->rsc
.page_vec
= page_vec
;
255 desc
->rsc
.fmr_pool
= fmr_pool
;
256 list_add(&desc
->list
, &fr_pool
->list
);
269 * iser_free_fmr_pool - releases the FMR pool and page vec
271 void iser_free_fmr_pool(struct ib_conn
*ib_conn
)
273 struct iser_fr_pool
*fr_pool
= &ib_conn
->fr_pool
;
274 struct iser_fr_desc
*desc
;
276 desc
= list_first_entry(&fr_pool
->list
,
277 struct iser_fr_desc
, list
);
278 list_del(&desc
->list
);
280 iser_info("freeing conn %p fmr pool %p\n",
281 ib_conn
, desc
->rsc
.fmr_pool
);
283 ib_destroy_fmr_pool(desc
->rsc
.fmr_pool
);
284 kfree(desc
->rsc
.page_vec
);
289 iser_alloc_reg_res(struct ib_device
*ib_device
,
291 struct iser_reg_resources
*res
,
296 res
->mr
= ib_alloc_mr(pd
, IB_MR_TYPE_MEM_REG
, size
);
297 if (IS_ERR(res
->mr
)) {
298 ret
= PTR_ERR(res
->mr
);
299 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret
);
308 iser_free_reg_res(struct iser_reg_resources
*rsc
)
310 ib_dereg_mr(rsc
->mr
);
314 iser_alloc_pi_ctx(struct ib_device
*ib_device
,
316 struct iser_fr_desc
*desc
,
319 struct iser_pi_context
*pi_ctx
= NULL
;
322 desc
->pi_ctx
= kzalloc(sizeof(*desc
->pi_ctx
), GFP_KERNEL
);
326 pi_ctx
= desc
->pi_ctx
;
328 ret
= iser_alloc_reg_res(ib_device
, pd
, &pi_ctx
->rsc
, size
);
330 iser_err("failed to allocate reg_resources\n");
331 goto alloc_reg_res_err
;
334 pi_ctx
->sig_mr
= ib_alloc_mr(pd
, IB_MR_TYPE_SIGNATURE
, 2);
335 if (IS_ERR(pi_ctx
->sig_mr
)) {
336 ret
= PTR_ERR(pi_ctx
->sig_mr
);
339 pi_ctx
->sig_mr_valid
= 1;
340 desc
->pi_ctx
->sig_protected
= 0;
345 iser_free_reg_res(&pi_ctx
->rsc
);
353 iser_free_pi_ctx(struct iser_pi_context
*pi_ctx
)
355 iser_free_reg_res(&pi_ctx
->rsc
);
356 ib_dereg_mr(pi_ctx
->sig_mr
);
360 static struct iser_fr_desc
*
361 iser_create_fastreg_desc(struct ib_device
*ib_device
,
366 struct iser_fr_desc
*desc
;
369 desc
= kzalloc(sizeof(*desc
), GFP_KERNEL
);
371 return ERR_PTR(-ENOMEM
);
373 ret
= iser_alloc_reg_res(ib_device
, pd
, &desc
->rsc
, size
);
375 goto reg_res_alloc_failure
;
378 ret
= iser_alloc_pi_ctx(ib_device
, pd
, desc
, size
);
380 goto pi_ctx_alloc_failure
;
385 pi_ctx_alloc_failure
:
386 iser_free_reg_res(&desc
->rsc
);
387 reg_res_alloc_failure
:
394 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors
395 * for fast registration work requests.
396 * returns 0 on success, or errno code on failure
398 int iser_alloc_fastreg_pool(struct ib_conn
*ib_conn
,
402 struct iser_device
*device
= ib_conn
->device
;
403 struct iser_fr_pool
*fr_pool
= &ib_conn
->fr_pool
;
404 struct iser_fr_desc
*desc
;
407 INIT_LIST_HEAD(&fr_pool
->list
);
408 spin_lock_init(&fr_pool
->lock
);
410 for (i
= 0; i
< cmds_max
; i
++) {
411 desc
= iser_create_fastreg_desc(device
->ib_device
, device
->pd
,
412 ib_conn
->pi_support
, size
);
418 list_add_tail(&desc
->list
, &fr_pool
->list
);
425 iser_free_fastreg_pool(ib_conn
);
430 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
432 void iser_free_fastreg_pool(struct ib_conn
*ib_conn
)
434 struct iser_fr_pool
*fr_pool
= &ib_conn
->fr_pool
;
435 struct iser_fr_desc
*desc
, *tmp
;
438 if (list_empty(&fr_pool
->list
))
441 iser_info("freeing conn %p fr pool\n", ib_conn
);
443 list_for_each_entry_safe(desc
, tmp
, &fr_pool
->list
, list
) {
444 list_del(&desc
->list
);
445 iser_free_reg_res(&desc
->rsc
);
447 iser_free_pi_ctx(desc
->pi_ctx
);
452 if (i
< fr_pool
->size
)
453 iser_warn("pool still has %d regions registered\n",
458 * iser_create_ib_conn_res - Queue-Pair (QP)
460 * returns 0 on success, -1 on failure
462 static int iser_create_ib_conn_res(struct ib_conn
*ib_conn
)
464 struct iser_conn
*iser_conn
= to_iser_conn(ib_conn
);
465 struct iser_device
*device
;
466 struct ib_device_attr
*dev_attr
;
467 struct ib_qp_init_attr init_attr
;
469 int index
, min_index
= 0;
471 BUG_ON(ib_conn
->device
== NULL
);
473 device
= ib_conn
->device
;
474 dev_attr
= &device
->dev_attr
;
476 memset(&init_attr
, 0, sizeof init_attr
);
478 mutex_lock(&ig
.connlist_mutex
);
479 /* select the CQ with the minimal number of usages */
480 for (index
= 0; index
< device
->comps_used
; index
++) {
481 if (device
->comps
[index
].active_qps
<
482 device
->comps
[min_index
].active_qps
)
485 ib_conn
->comp
= &device
->comps
[min_index
];
486 ib_conn
->comp
->active_qps
++;
487 mutex_unlock(&ig
.connlist_mutex
);
488 iser_info("cq index %d used for ib_conn %p\n", min_index
, ib_conn
);
490 init_attr
.event_handler
= iser_qp_event_callback
;
491 init_attr
.qp_context
= (void *)ib_conn
;
492 init_attr
.send_cq
= ib_conn
->comp
->cq
;
493 init_attr
.recv_cq
= ib_conn
->comp
->cq
;
494 init_attr
.cap
.max_recv_wr
= ISER_QP_MAX_RECV_DTOS
;
495 init_attr
.cap
.max_send_sge
= 2;
496 init_attr
.cap
.max_recv_sge
= 1;
497 init_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
498 init_attr
.qp_type
= IB_QPT_RC
;
499 if (ib_conn
->pi_support
) {
500 init_attr
.cap
.max_send_wr
= ISER_QP_SIG_MAX_REQ_DTOS
+ 1;
501 init_attr
.create_flags
|= IB_QP_CREATE_SIGNATURE_EN
;
502 iser_conn
->max_cmds
=
503 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS
);
505 if (dev_attr
->max_qp_wr
> ISER_QP_MAX_REQ_DTOS
) {
506 init_attr
.cap
.max_send_wr
= ISER_QP_MAX_REQ_DTOS
+ 1;
507 iser_conn
->max_cmds
=
508 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS
);
510 init_attr
.cap
.max_send_wr
= dev_attr
->max_qp_wr
;
511 iser_conn
->max_cmds
=
512 ISER_GET_MAX_XMIT_CMDS(dev_attr
->max_qp_wr
);
513 iser_dbg("device %s supports max_send_wr %d\n",
514 device
->ib_device
->name
, dev_attr
->max_qp_wr
);
518 ret
= rdma_create_qp(ib_conn
->cma_id
, device
->pd
, &init_attr
);
522 ib_conn
->qp
= ib_conn
->cma_id
->qp
;
523 iser_info("setting conn %p cma_id %p qp %p\n",
524 ib_conn
, ib_conn
->cma_id
,
525 ib_conn
->cma_id
->qp
);
529 mutex_lock(&ig
.connlist_mutex
);
530 ib_conn
->comp
->active_qps
--;
531 mutex_unlock(&ig
.connlist_mutex
);
532 iser_err("unable to alloc mem or create resource, err %d\n", ret
);
538 * based on the resolved device node GUID see if there already allocated
539 * device for this device. If there's no such, create one.
542 struct iser_device
*iser_device_find_by_ib_device(struct rdma_cm_id
*cma_id
)
544 struct iser_device
*device
;
546 mutex_lock(&ig
.device_list_mutex
);
548 list_for_each_entry(device
, &ig
.device_list
, ig_list
)
549 /* find if there's a match using the node GUID */
550 if (device
->ib_device
->node_guid
== cma_id
->device
->node_guid
)
553 device
= kzalloc(sizeof *device
, GFP_KERNEL
);
557 /* assign this device to the device */
558 device
->ib_device
= cma_id
->device
;
559 /* init the device and link it into ig device list */
560 if (iser_create_device_ib_res(device
)) {
565 list_add(&device
->ig_list
, &ig
.device_list
);
570 mutex_unlock(&ig
.device_list_mutex
);
574 /* if there's no demand for this device, release it */
575 static void iser_device_try_release(struct iser_device
*device
)
577 mutex_lock(&ig
.device_list_mutex
);
579 iser_info("device %p refcount %d\n", device
, device
->refcount
);
580 if (!device
->refcount
) {
581 iser_free_device_ib_res(device
);
582 list_del(&device
->ig_list
);
585 mutex_unlock(&ig
.device_list_mutex
);
589 * Called with state mutex held
591 static int iser_conn_state_comp_exch(struct iser_conn
*iser_conn
,
592 enum iser_conn_state comp
,
593 enum iser_conn_state exch
)
597 ret
= (iser_conn
->state
== comp
);
599 iser_conn
->state
= exch
;
604 void iser_release_work(struct work_struct
*work
)
606 struct iser_conn
*iser_conn
;
608 iser_conn
= container_of(work
, struct iser_conn
, release_work
);
610 /* Wait for conn_stop to complete */
611 wait_for_completion(&iser_conn
->stop_completion
);
612 /* Wait for IB resouces cleanup to complete */
613 wait_for_completion(&iser_conn
->ib_completion
);
615 mutex_lock(&iser_conn
->state_mutex
);
616 iser_conn
->state
= ISER_CONN_DOWN
;
617 mutex_unlock(&iser_conn
->state_mutex
);
619 iser_conn_release(iser_conn
);
623 * iser_free_ib_conn_res - release IB related resources
624 * @iser_conn: iser connection struct
625 * @destroy: indicator if we need to try to release the
626 * iser device and memory regoins pool (only iscsi
627 * shutdown and DEVICE_REMOVAL will use this).
629 * This routine is called with the iser state mutex held
630 * so the cm_id removal is out of here. It is Safe to
631 * be invoked multiple times.
633 static void iser_free_ib_conn_res(struct iser_conn
*iser_conn
,
636 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
637 struct iser_device
*device
= ib_conn
->device
;
639 iser_info("freeing conn %p cma_id %p qp %p\n",
640 iser_conn
, ib_conn
->cma_id
, ib_conn
->qp
);
642 if (ib_conn
->qp
!= NULL
) {
643 ib_conn
->comp
->active_qps
--;
644 rdma_destroy_qp(ib_conn
->cma_id
);
649 if (iser_conn
->rx_descs
)
650 iser_free_rx_descriptors(iser_conn
);
652 if (device
!= NULL
) {
653 iser_device_try_release(device
);
654 ib_conn
->device
= NULL
;
660 * Frees all conn objects and deallocs conn descriptor
662 void iser_conn_release(struct iser_conn
*iser_conn
)
664 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
666 mutex_lock(&ig
.connlist_mutex
);
667 list_del(&iser_conn
->conn_list
);
668 mutex_unlock(&ig
.connlist_mutex
);
670 mutex_lock(&iser_conn
->state_mutex
);
671 /* In case we endup here without ep_disconnect being invoked. */
672 if (iser_conn
->state
!= ISER_CONN_DOWN
) {
673 iser_warn("iser conn %p state %d, expected state down.\n",
674 iser_conn
, iser_conn
->state
);
675 iscsi_destroy_endpoint(iser_conn
->ep
);
676 iser_conn
->state
= ISER_CONN_DOWN
;
679 * In case we never got to bind stage, we still need to
680 * release IB resources (which is safe to call more than once).
682 iser_free_ib_conn_res(iser_conn
, true);
683 mutex_unlock(&iser_conn
->state_mutex
);
685 if (ib_conn
->cma_id
!= NULL
) {
686 rdma_destroy_id(ib_conn
->cma_id
);
687 ib_conn
->cma_id
= NULL
;
694 * triggers start of the disconnect procedures and wait for them to be done
695 * Called with state mutex held
697 int iser_conn_terminate(struct iser_conn
*iser_conn
)
699 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
700 struct ib_send_wr
*bad_wr
;
703 /* terminate the iser conn only if the conn state is UP */
704 if (!iser_conn_state_comp_exch(iser_conn
, ISER_CONN_UP
,
705 ISER_CONN_TERMINATING
))
708 iser_info("iser_conn %p state %d\n", iser_conn
, iser_conn
->state
);
710 /* suspend queuing of new iscsi commands */
711 if (iser_conn
->iscsi_conn
)
712 iscsi_suspend_queue(iser_conn
->iscsi_conn
);
715 * In case we didn't already clean up the cma_id (peer initiated
716 * a disconnection), we need to Cause the CMA to change the QP
719 if (ib_conn
->cma_id
) {
720 err
= rdma_disconnect(ib_conn
->cma_id
);
722 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
725 /* post an indication that all flush errors were consumed */
726 err
= ib_post_send(ib_conn
->qp
, &ib_conn
->beacon
, &bad_wr
);
728 iser_err("conn %p failed to post beacon", ib_conn
);
732 wait_for_completion(&ib_conn
->flush_comp
);
739 * Called with state mutex held
741 static void iser_connect_error(struct rdma_cm_id
*cma_id
)
743 struct iser_conn
*iser_conn
;
745 iser_conn
= (struct iser_conn
*)cma_id
->context
;
746 iser_conn
->state
= ISER_CONN_TERMINATING
;
750 iser_calc_scsi_params(struct iser_conn
*iser_conn
,
751 unsigned int max_sectors
)
753 struct iser_device
*device
= iser_conn
->ib_conn
.device
;
754 unsigned short sg_tablesize
, sup_sg_tablesize
;
756 sg_tablesize
= DIV_ROUND_UP(max_sectors
* 512, SIZE_4K
);
757 sup_sg_tablesize
= min_t(unsigned, ISCSI_ISER_MAX_SG_TABLESIZE
,
758 device
->dev_attr
.max_fast_reg_page_list_len
);
760 if (sg_tablesize
> sup_sg_tablesize
) {
761 sg_tablesize
= sup_sg_tablesize
;
762 iser_conn
->scsi_max_sectors
= sg_tablesize
* SIZE_4K
/ 512;
764 iser_conn
->scsi_max_sectors
= max_sectors
;
767 iser_conn
->scsi_sg_tablesize
= sg_tablesize
;
769 iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n",
770 iser_conn
, iser_conn
->scsi_sg_tablesize
,
771 iser_conn
->scsi_max_sectors
);
775 * Called with state mutex held
777 static void iser_addr_handler(struct rdma_cm_id
*cma_id
)
779 struct iser_device
*device
;
780 struct iser_conn
*iser_conn
;
781 struct ib_conn
*ib_conn
;
784 iser_conn
= (struct iser_conn
*)cma_id
->context
;
785 if (iser_conn
->state
!= ISER_CONN_PENDING
)
789 ib_conn
= &iser_conn
->ib_conn
;
790 device
= iser_device_find_by_ib_device(cma_id
);
792 iser_err("device lookup/creation failed\n");
793 iser_connect_error(cma_id
);
797 ib_conn
->device
= device
;
799 /* connection T10-PI support */
800 if (iser_pi_enable
) {
801 if (!(device
->dev_attr
.device_cap_flags
&
802 IB_DEVICE_SIGNATURE_HANDOVER
)) {
803 iser_warn("T10-PI requested but not supported on %s, "
804 "continue without T10-PI\n",
805 ib_conn
->device
->ib_device
->name
);
806 ib_conn
->pi_support
= false;
808 ib_conn
->pi_support
= true;
812 iser_calc_scsi_params(iser_conn
, iser_max_sectors
);
814 ret
= rdma_resolve_route(cma_id
, 1000);
816 iser_err("resolve route failed: %d\n", ret
);
817 iser_connect_error(cma_id
);
823 * Called with state mutex held
825 static void iser_route_handler(struct rdma_cm_id
*cma_id
)
827 struct rdma_conn_param conn_param
;
829 struct iser_cm_hdr req_hdr
;
830 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
831 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
832 struct iser_device
*device
= ib_conn
->device
;
834 if (iser_conn
->state
!= ISER_CONN_PENDING
)
838 ret
= iser_create_ib_conn_res(ib_conn
);
842 memset(&conn_param
, 0, sizeof conn_param
);
843 conn_param
.responder_resources
= device
->dev_attr
.max_qp_rd_atom
;
844 conn_param
.initiator_depth
= 1;
845 conn_param
.retry_count
= 7;
846 conn_param
.rnr_retry_count
= 6;
848 memset(&req_hdr
, 0, sizeof(req_hdr
));
849 req_hdr
.flags
= (ISER_ZBVA_NOT_SUPPORTED
|
850 ISER_SEND_W_INV_NOT_SUPPORTED
);
851 conn_param
.private_data
= (void *)&req_hdr
;
852 conn_param
.private_data_len
= sizeof(struct iser_cm_hdr
);
854 ret
= rdma_connect(cma_id
, &conn_param
);
856 iser_err("failure connecting: %d\n", ret
);
862 iser_connect_error(cma_id
);
865 static void iser_connected_handler(struct rdma_cm_id
*cma_id
)
867 struct iser_conn
*iser_conn
;
868 struct ib_qp_attr attr
;
869 struct ib_qp_init_attr init_attr
;
871 iser_conn
= (struct iser_conn
*)cma_id
->context
;
872 if (iser_conn
->state
!= ISER_CONN_PENDING
)
876 (void)ib_query_qp(cma_id
->qp
, &attr
, ~0, &init_attr
);
877 iser_info("remote qpn:%x my qpn:%x\n", attr
.dest_qp_num
, cma_id
->qp
->qp_num
);
879 iser_conn
->state
= ISER_CONN_UP
;
880 complete(&iser_conn
->up_completion
);
883 static void iser_disconnected_handler(struct rdma_cm_id
*cma_id
)
885 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
887 if (iser_conn_terminate(iser_conn
)) {
888 if (iser_conn
->iscsi_conn
)
889 iscsi_conn_failure(iser_conn
->iscsi_conn
,
890 ISCSI_ERR_CONN_FAILED
);
892 iser_err("iscsi_iser connection isn't bound\n");
896 static void iser_cleanup_handler(struct rdma_cm_id
*cma_id
,
899 struct iser_conn
*iser_conn
= (struct iser_conn
*)cma_id
->context
;
902 * We are not guaranteed that we visited disconnected_handler
903 * by now, call it here to be safe that we handle CM drep
906 iser_disconnected_handler(cma_id
);
907 iser_free_ib_conn_res(iser_conn
, destroy
);
908 complete(&iser_conn
->ib_completion
);
911 static int iser_cma_handler(struct rdma_cm_id
*cma_id
, struct rdma_cm_event
*event
)
913 struct iser_conn
*iser_conn
;
916 iser_conn
= (struct iser_conn
*)cma_id
->context
;
917 iser_info("%s (%d): status %d conn %p id %p\n",
918 rdma_event_msg(event
->event
), event
->event
,
919 event
->status
, cma_id
->context
, cma_id
);
921 mutex_lock(&iser_conn
->state_mutex
);
922 switch (event
->event
) {
923 case RDMA_CM_EVENT_ADDR_RESOLVED
:
924 iser_addr_handler(cma_id
);
926 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
927 iser_route_handler(cma_id
);
929 case RDMA_CM_EVENT_ESTABLISHED
:
930 iser_connected_handler(cma_id
);
932 case RDMA_CM_EVENT_ADDR_ERROR
:
933 case RDMA_CM_EVENT_ROUTE_ERROR
:
934 case RDMA_CM_EVENT_CONNECT_ERROR
:
935 case RDMA_CM_EVENT_UNREACHABLE
:
936 case RDMA_CM_EVENT_REJECTED
:
937 iser_connect_error(cma_id
);
939 case RDMA_CM_EVENT_DISCONNECTED
:
940 case RDMA_CM_EVENT_ADDR_CHANGE
:
941 case RDMA_CM_EVENT_TIMEWAIT_EXIT
:
942 iser_cleanup_handler(cma_id
, false);
944 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
946 * we *must* destroy the device as we cannot rely
947 * on iscsid to be around to initiate error handling.
948 * also if we are not in state DOWN implicitly destroy
951 iser_cleanup_handler(cma_id
, true);
952 if (iser_conn
->state
!= ISER_CONN_DOWN
) {
953 iser_conn
->ib_conn
.cma_id
= NULL
;
958 iser_err("Unexpected RDMA CM event: %s (%d)\n",
959 rdma_event_msg(event
->event
), event
->event
);
962 mutex_unlock(&iser_conn
->state_mutex
);
967 void iser_conn_init(struct iser_conn
*iser_conn
)
969 iser_conn
->state
= ISER_CONN_INIT
;
970 iser_conn
->ib_conn
.post_recv_buf_count
= 0;
971 init_completion(&iser_conn
->ib_conn
.flush_comp
);
972 init_completion(&iser_conn
->stop_completion
);
973 init_completion(&iser_conn
->ib_completion
);
974 init_completion(&iser_conn
->up_completion
);
975 INIT_LIST_HEAD(&iser_conn
->conn_list
);
976 mutex_init(&iser_conn
->state_mutex
);
980 * starts the process of connecting to the target
981 * sleeps until the connection is established or rejected
983 int iser_connect(struct iser_conn
*iser_conn
,
984 struct sockaddr
*src_addr
,
985 struct sockaddr
*dst_addr
,
988 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
991 mutex_lock(&iser_conn
->state_mutex
);
993 sprintf(iser_conn
->name
, "%pISp", dst_addr
);
995 iser_info("connecting to: %s\n", iser_conn
->name
);
997 /* the device is known only --after-- address resolution */
998 ib_conn
->device
= NULL
;
1000 iser_conn
->state
= ISER_CONN_PENDING
;
1002 ib_conn
->beacon
.wr_id
= ISER_BEACON_WRID
;
1003 ib_conn
->beacon
.opcode
= IB_WR_SEND
;
1005 ib_conn
->cma_id
= rdma_create_id(&init_net
, iser_cma_handler
,
1007 RDMA_PS_TCP
, IB_QPT_RC
);
1008 if (IS_ERR(ib_conn
->cma_id
)) {
1009 err
= PTR_ERR(ib_conn
->cma_id
);
1010 iser_err("rdma_create_id failed: %d\n", err
);
1014 err
= rdma_resolve_addr(ib_conn
->cma_id
, src_addr
, dst_addr
, 1000);
1016 iser_err("rdma_resolve_addr failed: %d\n", err
);
1020 if (!non_blocking
) {
1021 wait_for_completion_interruptible(&iser_conn
->up_completion
);
1023 if (iser_conn
->state
!= ISER_CONN_UP
) {
1025 goto connect_failure
;
1028 mutex_unlock(&iser_conn
->state_mutex
);
1030 mutex_lock(&ig
.connlist_mutex
);
1031 list_add(&iser_conn
->conn_list
, &ig
.connlist
);
1032 mutex_unlock(&ig
.connlist_mutex
);
1036 ib_conn
->cma_id
= NULL
;
1038 iser_conn
->state
= ISER_CONN_DOWN
;
1040 mutex_unlock(&iser_conn
->state_mutex
);
1041 iser_conn_release(iser_conn
);
1045 int iser_post_recvl(struct iser_conn
*iser_conn
)
1047 struct ib_recv_wr rx_wr
, *rx_wr_failed
;
1048 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
1049 struct iser_login_desc
*desc
= &iser_conn
->login_desc
;
1052 desc
->sge
.addr
= desc
->rsp_dma
;
1053 desc
->sge
.length
= ISER_RX_LOGIN_SIZE
;
1054 desc
->sge
.lkey
= ib_conn
->device
->pd
->local_dma_lkey
;
1056 rx_wr
.wr_id
= (uintptr_t)desc
;
1057 rx_wr
.sg_list
= &desc
->sge
;
1061 ib_conn
->post_recv_buf_count
++;
1062 ib_ret
= ib_post_recv(ib_conn
->qp
, &rx_wr
, &rx_wr_failed
);
1064 iser_err("ib_post_recv failed ret=%d\n", ib_ret
);
1065 ib_conn
->post_recv_buf_count
--;
1070 int iser_post_recvm(struct iser_conn
*iser_conn
, int count
)
1072 struct ib_recv_wr
*rx_wr
, *rx_wr_failed
;
1074 struct ib_conn
*ib_conn
= &iser_conn
->ib_conn
;
1075 unsigned int my_rx_head
= iser_conn
->rx_desc_head
;
1076 struct iser_rx_desc
*rx_desc
;
1078 for (rx_wr
= ib_conn
->rx_wr
, i
= 0; i
< count
; i
++, rx_wr
++) {
1079 rx_desc
= &iser_conn
->rx_descs
[my_rx_head
];
1080 rx_wr
->wr_id
= (uintptr_t)rx_desc
;
1081 rx_wr
->sg_list
= &rx_desc
->rx_sg
;
1083 rx_wr
->next
= rx_wr
+ 1;
1084 my_rx_head
= (my_rx_head
+ 1) & iser_conn
->qp_max_recv_dtos_mask
;
1088 rx_wr
->next
= NULL
; /* mark end of work requests list */
1090 ib_conn
->post_recv_buf_count
+= count
;
1091 ib_ret
= ib_post_recv(ib_conn
->qp
, ib_conn
->rx_wr
, &rx_wr_failed
);
1093 iser_err("ib_post_recv failed ret=%d\n", ib_ret
);
1094 ib_conn
->post_recv_buf_count
-= count
;
1096 iser_conn
->rx_desc_head
= my_rx_head
;
1102 * iser_start_send - Initiate a Send DTO operation
1104 * returns 0 on success, -1 on failure
1106 int iser_post_send(struct ib_conn
*ib_conn
, struct iser_tx_desc
*tx_desc
,
1109 struct ib_send_wr
*bad_wr
, *wr
= iser_tx_next_wr(tx_desc
);
1112 ib_dma_sync_single_for_device(ib_conn
->device
->ib_device
,
1113 tx_desc
->dma_addr
, ISER_HEADERS_LEN
,
1117 wr
->wr_id
= (uintptr_t)tx_desc
;
1118 wr
->sg_list
= tx_desc
->tx_sg
;
1119 wr
->num_sge
= tx_desc
->num_sge
;
1120 wr
->opcode
= IB_WR_SEND
;
1121 wr
->send_flags
= signal
? IB_SEND_SIGNALED
: 0;
1123 ib_ret
= ib_post_send(ib_conn
->qp
, &tx_desc
->wrs
[0].send
, &bad_wr
);
1125 iser_err("ib_post_send failed, ret:%d opcode:%d\n",
1126 ib_ret
, bad_wr
->opcode
);
1132 * is_iser_tx_desc - Indicate if the completion wr_id
1133 * is a TX descriptor or not.
1134 * @iser_conn: iser connection
1135 * @wr_id: completion WR identifier
1137 * Since we cannot rely on wc opcode in FLUSH errors
1138 * we must work around it by checking if the wr_id address
1139 * falls in the iser connection rx_descs buffer. If so
1140 * it is an RX descriptor, otherwize it is a TX.
1143 is_iser_tx_desc(struct iser_conn
*iser_conn
, void *wr_id
)
1145 void *start
= iser_conn
->rx_descs
;
1146 int len
= iser_conn
->num_rx_descs
* sizeof(*iser_conn
->rx_descs
);
1148 if (wr_id
>= start
&& wr_id
< start
+ len
)
1155 * iser_handle_comp_error() - Handle error completion
1156 * @ib_conn: connection RDMA resources
1157 * @wc: work completion
1159 * Notes: We may handle a FLUSH error completion and in this case
1160 * we only cleanup in case TX type was DATAOUT. For non-FLUSH
1161 * error completion we should also notify iscsi layer that
1162 * connection is failed (in case we passed bind stage).
1165 iser_handle_comp_error(struct ib_conn
*ib_conn
,
1168 struct iser_conn
*iser_conn
= to_iser_conn(ib_conn
);
1169 void *wr_id
= (void *)(uintptr_t)wc
->wr_id
;
1171 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
1172 if (iser_conn
->iscsi_conn
)
1173 iscsi_conn_failure(iser_conn
->iscsi_conn
,
1174 ISCSI_ERR_CONN_FAILED
);
1176 if (wc
->wr_id
== ISER_FASTREG_LI_WRID
)
1179 if (is_iser_tx_desc(iser_conn
, wr_id
)) {
1180 struct iser_tx_desc
*desc
= wr_id
;
1182 if (desc
->type
== ISCSI_TX_DATAOUT
)
1183 kmem_cache_free(ig
.desc_cache
, desc
);
1185 ib_conn
->post_recv_buf_count
--;
1190 * iser_handle_wc - handle a single work completion
1191 * @wc: work completion
1193 * Soft-IRQ context, work completion can be either
1194 * SEND or RECV, and can turn out successful or
1195 * with error (or flush error).
1197 static void iser_handle_wc(struct ib_wc
*wc
)
1199 struct ib_conn
*ib_conn
;
1200 struct iser_tx_desc
*tx_desc
;
1201 struct iser_rx_desc
*rx_desc
;
1203 ib_conn
= wc
->qp
->qp_context
;
1204 if (likely(wc
->status
== IB_WC_SUCCESS
)) {
1205 if (wc
->opcode
== IB_WC_RECV
) {
1206 rx_desc
= (struct iser_rx_desc
*)(uintptr_t)wc
->wr_id
;
1207 iser_rcv_completion(rx_desc
, wc
->byte_len
,
1210 if (wc
->opcode
== IB_WC_SEND
) {
1211 tx_desc
= (struct iser_tx_desc
*)(uintptr_t)wc
->wr_id
;
1212 iser_snd_completion(tx_desc
, ib_conn
);
1214 iser_err("Unknown wc opcode %d\n", wc
->opcode
);
1217 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
1218 iser_err("%s (%d): wr id %llx vend_err %x\n",
1219 ib_wc_status_msg(wc
->status
), wc
->status
,
1220 wc
->wr_id
, wc
->vendor_err
);
1222 iser_dbg("%s (%d): wr id %llx\n",
1223 ib_wc_status_msg(wc
->status
), wc
->status
,
1226 if (wc
->wr_id
== ISER_BEACON_WRID
)
1227 /* all flush errors were consumed */
1228 complete(&ib_conn
->flush_comp
);
1230 iser_handle_comp_error(ib_conn
, wc
);
1235 * iser_cq_tasklet_fn - iSER completion polling loop
1236 * @data: iSER completion context
1238 * Soft-IRQ context, polling connection CQ until
1239 * either CQ was empty or we exausted polling budget
1241 static void iser_cq_tasklet_fn(unsigned long data
)
1243 struct iser_comp
*comp
= (struct iser_comp
*)data
;
1244 struct ib_cq
*cq
= comp
->cq
;
1245 struct ib_wc
*const wcs
= comp
->wcs
;
1246 int i
, n
, completed
= 0;
1248 while ((n
= ib_poll_cq(cq
, ARRAY_SIZE(comp
->wcs
), wcs
)) > 0) {
1249 for (i
= 0; i
< n
; i
++)
1250 iser_handle_wc(&wcs
[i
]);
1253 if (completed
>= iser_cq_poll_limit
)
1258 * It is assumed here that arming CQ only once its empty
1259 * would not cause interrupts to be missed.
1261 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1263 iser_dbg("got %d completions\n", completed
);
1266 static void iser_cq_callback(struct ib_cq
*cq
, void *cq_context
)
1268 struct iser_comp
*comp
= cq_context
;
1270 tasklet_schedule(&comp
->tasklet
);
1273 u8
iser_check_task_pi_status(struct iscsi_iser_task
*iser_task
,
1274 enum iser_data_dir cmd_dir
, sector_t
*sector
)
1276 struct iser_mem_reg
*reg
= &iser_task
->rdma_reg
[cmd_dir
];
1277 struct iser_fr_desc
*desc
= reg
->mem_h
;
1278 unsigned long sector_size
= iser_task
->sc
->device
->sector_size
;
1279 struct ib_mr_status mr_status
;
1282 if (desc
&& desc
->pi_ctx
->sig_protected
) {
1283 desc
->pi_ctx
->sig_protected
= 0;
1284 ret
= ib_check_mr_status(desc
->pi_ctx
->sig_mr
,
1285 IB_MR_CHECK_SIG_STATUS
, &mr_status
);
1287 pr_err("ib_check_mr_status failed, ret %d\n", ret
);
1291 if (mr_status
.fail_status
& IB_MR_CHECK_SIG_STATUS
) {
1292 sector_t sector_off
= mr_status
.sig_err
.sig_err_offset
;
1294 do_div(sector_off
, sector_size
+ 8);
1295 *sector
= scsi_get_lba(iser_task
->sc
) + sector_off
;
1297 pr_err("PI error found type %d at sector %llx "
1298 "expected %x vs actual %x\n",
1299 mr_status
.sig_err
.err_type
,
1300 (unsigned long long)*sector
,
1301 mr_status
.sig_err
.expected
,
1302 mr_status
.sig_err
.actual
);
1304 switch (mr_status
.sig_err
.err_type
) {
1305 case IB_SIG_BAD_GUARD
:
1307 case IB_SIG_BAD_REFTAG
:
1309 case IB_SIG_BAD_APPTAG
:
1317 /* Not alot we can do here, return ambiguous guard error */