2 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
3 * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
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 BSD-type
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
18 * Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials provided
21 * with the distribution.
23 * Neither the name of the Network Appliance, Inc. nor the names of
24 * its contributors may be used to endorse or promote products
25 * derived from this software without specific prior written
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 * Author: Tom Tucker <tom@opengridcomputing.com>
43 #include <linux/sunrpc/svc_xprt.h>
44 #include <linux/sunrpc/debug.h>
45 #include <linux/sunrpc/rpc_rdma.h>
46 #include <linux/interrupt.h>
47 #include <linux/sched.h>
48 #include <linux/slab.h>
49 #include <linux/spinlock.h>
50 #include <linux/workqueue.h>
51 #include <rdma/ib_verbs.h>
52 #include <rdma/rdma_cm.h>
53 #include <linux/sunrpc/svc_rdma.h>
54 #include <linux/export.h>
55 #include "xprt_rdma.h"
57 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
59 static struct svcxprt_rdma
*rdma_create_xprt(struct svc_serv
*, int);
60 static struct svc_xprt
*svc_rdma_create(struct svc_serv
*serv
,
62 struct sockaddr
*sa
, int salen
,
64 static struct svc_xprt
*svc_rdma_accept(struct svc_xprt
*xprt
);
65 static void svc_rdma_release_rqst(struct svc_rqst
*);
66 static void svc_rdma_detach(struct svc_xprt
*xprt
);
67 static void svc_rdma_free(struct svc_xprt
*xprt
);
68 static int svc_rdma_has_wspace(struct svc_xprt
*xprt
);
69 static int svc_rdma_secure_port(struct svc_rqst
*);
71 static struct svc_xprt_ops svc_rdma_ops
= {
72 .xpo_create
= svc_rdma_create
,
73 .xpo_recvfrom
= svc_rdma_recvfrom
,
74 .xpo_sendto
= svc_rdma_sendto
,
75 .xpo_release_rqst
= svc_rdma_release_rqst
,
76 .xpo_detach
= svc_rdma_detach
,
77 .xpo_free
= svc_rdma_free
,
78 .xpo_prep_reply_hdr
= svc_rdma_prep_reply_hdr
,
79 .xpo_has_wspace
= svc_rdma_has_wspace
,
80 .xpo_accept
= svc_rdma_accept
,
81 .xpo_secure_port
= svc_rdma_secure_port
,
84 struct svc_xprt_class svc_rdma_class
= {
86 .xcl_owner
= THIS_MODULE
,
87 .xcl_ops
= &svc_rdma_ops
,
88 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_RDMA
,
89 .xcl_ident
= XPRT_TRANSPORT_RDMA
,
92 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
93 static struct svc_xprt
*svc_rdma_bc_create(struct svc_serv
*, struct net
*,
94 struct sockaddr
*, int, int);
95 static void svc_rdma_bc_detach(struct svc_xprt
*);
96 static void svc_rdma_bc_free(struct svc_xprt
*);
98 static struct svc_xprt_ops svc_rdma_bc_ops
= {
99 .xpo_create
= svc_rdma_bc_create
,
100 .xpo_detach
= svc_rdma_bc_detach
,
101 .xpo_free
= svc_rdma_bc_free
,
102 .xpo_prep_reply_hdr
= svc_rdma_prep_reply_hdr
,
103 .xpo_secure_port
= svc_rdma_secure_port
,
106 struct svc_xprt_class svc_rdma_bc_class
= {
107 .xcl_name
= "rdma-bc",
108 .xcl_owner
= THIS_MODULE
,
109 .xcl_ops
= &svc_rdma_bc_ops
,
110 .xcl_max_payload
= (1024 - RPCRDMA_HDRLEN_MIN
)
113 static struct svc_xprt
*svc_rdma_bc_create(struct svc_serv
*serv
,
115 struct sockaddr
*sa
, int salen
,
118 struct svcxprt_rdma
*cma_xprt
;
119 struct svc_xprt
*xprt
;
121 cma_xprt
= rdma_create_xprt(serv
, 0);
123 return ERR_PTR(-ENOMEM
);
124 xprt
= &cma_xprt
->sc_xprt
;
126 svc_xprt_init(net
, &svc_rdma_bc_class
, xprt
, serv
);
127 serv
->sv_bc_xprt
= xprt
;
129 dprintk("svcrdma: %s(%p)\n", __func__
, xprt
);
133 static void svc_rdma_bc_detach(struct svc_xprt
*xprt
)
135 dprintk("svcrdma: %s(%p)\n", __func__
, xprt
);
138 static void svc_rdma_bc_free(struct svc_xprt
*xprt
)
140 struct svcxprt_rdma
*rdma
=
141 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
143 dprintk("svcrdma: %s(%p)\n", __func__
, xprt
);
147 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
149 static struct svc_rdma_op_ctxt
*alloc_ctxt(struct svcxprt_rdma
*xprt
,
152 struct svc_rdma_op_ctxt
*ctxt
;
154 ctxt
= kmalloc(sizeof(*ctxt
), flags
);
157 INIT_LIST_HEAD(&ctxt
->free
);
158 INIT_LIST_HEAD(&ctxt
->dto_q
);
163 static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma
*xprt
)
167 /* Each RPC/RDMA credit can consume a number of send
168 * and receive WQEs. One ctxt is allocated for each.
170 i
= xprt
->sc_sq_depth
+ xprt
->sc_rq_depth
;
173 struct svc_rdma_op_ctxt
*ctxt
;
175 ctxt
= alloc_ctxt(xprt
, GFP_KERNEL
);
177 dprintk("svcrdma: No memory for RDMA ctxt\n");
180 list_add(&ctxt
->free
, &xprt
->sc_ctxts
);
185 struct svc_rdma_op_ctxt
*svc_rdma_get_context(struct svcxprt_rdma
*xprt
)
187 struct svc_rdma_op_ctxt
*ctxt
= NULL
;
189 spin_lock_bh(&xprt
->sc_ctxt_lock
);
190 xprt
->sc_ctxt_used
++;
191 if (list_empty(&xprt
->sc_ctxts
))
194 ctxt
= list_first_entry(&xprt
->sc_ctxts
,
195 struct svc_rdma_op_ctxt
, free
);
196 list_del_init(&ctxt
->free
);
197 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
201 ctxt
->mapped_sges
= 0;
206 /* Either pre-allocation missed the mark, or send
207 * queue accounting is broken.
209 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
211 ctxt
= alloc_ctxt(xprt
, GFP_NOIO
);
215 spin_lock_bh(&xprt
->sc_ctxt_lock
);
216 xprt
->sc_ctxt_used
--;
217 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
218 WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n");
222 void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt
*ctxt
)
224 struct svcxprt_rdma
*xprt
= ctxt
->xprt
;
225 struct ib_device
*device
= xprt
->sc_cm_id
->device
;
226 u32 lkey
= xprt
->sc_pd
->local_dma_lkey
;
227 unsigned int i
, count
;
229 for (count
= 0, i
= 0; i
< ctxt
->mapped_sges
; i
++) {
231 * Unmap the DMA addr in the SGE if the lkey matches
232 * the local_dma_lkey, otherwise, ignore it since it is
233 * an FRMR lkey and will be unmapped later when the
234 * last WR that uses it completes.
236 if (ctxt
->sge
[i
].lkey
== lkey
) {
238 ib_dma_unmap_page(device
,
244 ctxt
->mapped_sges
= 0;
245 atomic_sub(count
, &xprt
->sc_dma_used
);
248 void svc_rdma_put_context(struct svc_rdma_op_ctxt
*ctxt
, int free_pages
)
250 struct svcxprt_rdma
*xprt
= ctxt
->xprt
;
254 for (i
= 0; i
< ctxt
->count
; i
++)
255 put_page(ctxt
->pages
[i
]);
257 spin_lock_bh(&xprt
->sc_ctxt_lock
);
258 xprt
->sc_ctxt_used
--;
259 list_add(&ctxt
->free
, &xprt
->sc_ctxts
);
260 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
263 static void svc_rdma_destroy_ctxts(struct svcxprt_rdma
*xprt
)
265 while (!list_empty(&xprt
->sc_ctxts
)) {
266 struct svc_rdma_op_ctxt
*ctxt
;
268 ctxt
= list_first_entry(&xprt
->sc_ctxts
,
269 struct svc_rdma_op_ctxt
, free
);
270 list_del(&ctxt
->free
);
275 static struct svc_rdma_req_map
*alloc_req_map(gfp_t flags
)
277 struct svc_rdma_req_map
*map
;
279 map
= kmalloc(sizeof(*map
), flags
);
281 INIT_LIST_HEAD(&map
->free
);
285 static bool svc_rdma_prealloc_maps(struct svcxprt_rdma
*xprt
)
289 /* One for each receive buffer on this connection. */
290 i
= xprt
->sc_max_requests
;
293 struct svc_rdma_req_map
*map
;
295 map
= alloc_req_map(GFP_KERNEL
);
297 dprintk("svcrdma: No memory for request map\n");
300 list_add(&map
->free
, &xprt
->sc_maps
);
305 struct svc_rdma_req_map
*svc_rdma_get_req_map(struct svcxprt_rdma
*xprt
)
307 struct svc_rdma_req_map
*map
= NULL
;
309 spin_lock(&xprt
->sc_map_lock
);
310 if (list_empty(&xprt
->sc_maps
))
313 map
= list_first_entry(&xprt
->sc_maps
,
314 struct svc_rdma_req_map
, free
);
315 list_del_init(&map
->free
);
316 spin_unlock(&xprt
->sc_map_lock
);
323 spin_unlock(&xprt
->sc_map_lock
);
325 /* Pre-allocation amount was incorrect */
326 map
= alloc_req_map(GFP_NOIO
);
330 WARN_ONCE(1, "svcrdma: empty request map list?\n");
334 void svc_rdma_put_req_map(struct svcxprt_rdma
*xprt
,
335 struct svc_rdma_req_map
*map
)
337 spin_lock(&xprt
->sc_map_lock
);
338 list_add(&map
->free
, &xprt
->sc_maps
);
339 spin_unlock(&xprt
->sc_map_lock
);
342 static void svc_rdma_destroy_maps(struct svcxprt_rdma
*xprt
)
344 while (!list_empty(&xprt
->sc_maps
)) {
345 struct svc_rdma_req_map
*map
;
347 map
= list_first_entry(&xprt
->sc_maps
,
348 struct svc_rdma_req_map
, free
);
349 list_del(&map
->free
);
354 /* QP event handler */
355 static void qp_event_handler(struct ib_event
*event
, void *context
)
357 struct svc_xprt
*xprt
= context
;
359 switch (event
->event
) {
360 /* These are considered benign events */
361 case IB_EVENT_PATH_MIG
:
362 case IB_EVENT_COMM_EST
:
363 case IB_EVENT_SQ_DRAINED
:
364 case IB_EVENT_QP_LAST_WQE_REACHED
:
365 dprintk("svcrdma: QP event %s (%d) received for QP=%p\n",
366 ib_event_msg(event
->event
), event
->event
,
369 /* These are considered fatal events */
370 case IB_EVENT_PATH_MIG_ERR
:
371 case IB_EVENT_QP_FATAL
:
372 case IB_EVENT_QP_REQ_ERR
:
373 case IB_EVENT_QP_ACCESS_ERR
:
374 case IB_EVENT_DEVICE_FATAL
:
376 dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, "
377 "closing transport\n",
378 ib_event_msg(event
->event
), event
->event
,
380 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
386 * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
387 * @cq: completion queue
391 static void svc_rdma_wc_receive(struct ib_cq
*cq
, struct ib_wc
*wc
)
393 struct svcxprt_rdma
*xprt
= cq
->cq_context
;
394 struct ib_cqe
*cqe
= wc
->wr_cqe
;
395 struct svc_rdma_op_ctxt
*ctxt
;
397 /* WARNING: Only wc->wr_cqe and wc->status are reliable */
398 ctxt
= container_of(cqe
, struct svc_rdma_op_ctxt
, cqe
);
399 ctxt
->wc_status
= wc
->status
;
400 svc_rdma_unmap_dma(ctxt
);
402 if (wc
->status
!= IB_WC_SUCCESS
)
405 /* All wc fields are now known to be valid */
406 ctxt
->byte_len
= wc
->byte_len
;
407 spin_lock(&xprt
->sc_rq_dto_lock
);
408 list_add_tail(&ctxt
->dto_q
, &xprt
->sc_rq_dto_q
);
409 spin_unlock(&xprt
->sc_rq_dto_lock
);
411 set_bit(XPT_DATA
, &xprt
->sc_xprt
.xpt_flags
);
412 if (test_bit(RDMAXPRT_CONN_PENDING
, &xprt
->sc_flags
))
414 svc_xprt_enqueue(&xprt
->sc_xprt
);
418 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
419 pr_warn("svcrdma: receive: %s (%u/0x%x)\n",
420 ib_wc_status_msg(wc
->status
),
421 wc
->status
, wc
->vendor_err
);
422 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
423 svc_rdma_put_context(ctxt
, 1);
426 svc_xprt_put(&xprt
->sc_xprt
);
429 static void svc_rdma_send_wc_common(struct svcxprt_rdma
*xprt
,
433 if (wc
->status
!= IB_WC_SUCCESS
)
437 atomic_dec(&xprt
->sc_sq_count
);
438 wake_up(&xprt
->sc_send_wait
);
442 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
443 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
444 pr_err("svcrdma: %s: %s (%u/0x%x)\n",
445 opname
, ib_wc_status_msg(wc
->status
),
446 wc
->status
, wc
->vendor_err
);
450 static void svc_rdma_send_wc_common_put(struct ib_cq
*cq
, struct ib_wc
*wc
,
453 struct svcxprt_rdma
*xprt
= cq
->cq_context
;
455 svc_rdma_send_wc_common(xprt
, wc
, opname
);
456 svc_xprt_put(&xprt
->sc_xprt
);
460 * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
461 * @cq: completion queue
465 void svc_rdma_wc_send(struct ib_cq
*cq
, struct ib_wc
*wc
)
467 struct ib_cqe
*cqe
= wc
->wr_cqe
;
468 struct svc_rdma_op_ctxt
*ctxt
;
470 svc_rdma_send_wc_common_put(cq
, wc
, "send");
472 ctxt
= container_of(cqe
, struct svc_rdma_op_ctxt
, cqe
);
473 svc_rdma_unmap_dma(ctxt
);
474 svc_rdma_put_context(ctxt
, 1);
478 * svc_rdma_wc_write - Invoked by RDMA provider for each polled Write WC
479 * @cq: completion queue
483 void svc_rdma_wc_write(struct ib_cq
*cq
, struct ib_wc
*wc
)
485 struct ib_cqe
*cqe
= wc
->wr_cqe
;
486 struct svc_rdma_op_ctxt
*ctxt
;
488 svc_rdma_send_wc_common_put(cq
, wc
, "write");
490 ctxt
= container_of(cqe
, struct svc_rdma_op_ctxt
, cqe
);
491 svc_rdma_unmap_dma(ctxt
);
492 svc_rdma_put_context(ctxt
, 0);
496 * svc_rdma_wc_reg - Invoked by RDMA provider for each polled FASTREG WC
497 * @cq: completion queue
501 void svc_rdma_wc_reg(struct ib_cq
*cq
, struct ib_wc
*wc
)
503 svc_rdma_send_wc_common_put(cq
, wc
, "fastreg");
507 * svc_rdma_wc_read - Invoked by RDMA provider for each polled Read WC
508 * @cq: completion queue
512 void svc_rdma_wc_read(struct ib_cq
*cq
, struct ib_wc
*wc
)
514 struct svcxprt_rdma
*xprt
= cq
->cq_context
;
515 struct ib_cqe
*cqe
= wc
->wr_cqe
;
516 struct svc_rdma_op_ctxt
*ctxt
;
518 svc_rdma_send_wc_common(xprt
, wc
, "read");
520 ctxt
= container_of(cqe
, struct svc_rdma_op_ctxt
, cqe
);
521 svc_rdma_unmap_dma(ctxt
);
522 svc_rdma_put_frmr(xprt
, ctxt
->frmr
);
524 if (test_bit(RDMACTXT_F_LAST_CTXT
, &ctxt
->flags
)) {
525 struct svc_rdma_op_ctxt
*read_hdr
;
527 read_hdr
= ctxt
->read_hdr
;
528 spin_lock(&xprt
->sc_rq_dto_lock
);
529 list_add_tail(&read_hdr
->dto_q
,
530 &xprt
->sc_read_complete_q
);
531 spin_unlock(&xprt
->sc_rq_dto_lock
);
533 set_bit(XPT_DATA
, &xprt
->sc_xprt
.xpt_flags
);
534 svc_xprt_enqueue(&xprt
->sc_xprt
);
537 svc_rdma_put_context(ctxt
, 0);
538 svc_xprt_put(&xprt
->sc_xprt
);
542 * svc_rdma_wc_inv - Invoked by RDMA provider for each polled LOCAL_INV WC
543 * @cq: completion queue
547 void svc_rdma_wc_inv(struct ib_cq
*cq
, struct ib_wc
*wc
)
549 svc_rdma_send_wc_common_put(cq
, wc
, "localInv");
552 static struct svcxprt_rdma
*rdma_create_xprt(struct svc_serv
*serv
,
555 struct svcxprt_rdma
*cma_xprt
= kzalloc(sizeof *cma_xprt
, GFP_KERNEL
);
559 svc_xprt_init(&init_net
, &svc_rdma_class
, &cma_xprt
->sc_xprt
, serv
);
560 INIT_LIST_HEAD(&cma_xprt
->sc_accept_q
);
561 INIT_LIST_HEAD(&cma_xprt
->sc_dto_q
);
562 INIT_LIST_HEAD(&cma_xprt
->sc_rq_dto_q
);
563 INIT_LIST_HEAD(&cma_xprt
->sc_read_complete_q
);
564 INIT_LIST_HEAD(&cma_xprt
->sc_frmr_q
);
565 INIT_LIST_HEAD(&cma_xprt
->sc_ctxts
);
566 INIT_LIST_HEAD(&cma_xprt
->sc_maps
);
567 init_waitqueue_head(&cma_xprt
->sc_send_wait
);
569 spin_lock_init(&cma_xprt
->sc_lock
);
570 spin_lock_init(&cma_xprt
->sc_rq_dto_lock
);
571 spin_lock_init(&cma_xprt
->sc_frmr_q_lock
);
572 spin_lock_init(&cma_xprt
->sc_ctxt_lock
);
573 spin_lock_init(&cma_xprt
->sc_map_lock
);
576 set_bit(XPT_LISTENER
, &cma_xprt
->sc_xprt
.xpt_flags
);
581 int svc_rdma_post_recv(struct svcxprt_rdma
*xprt
, gfp_t flags
)
583 struct ib_recv_wr recv_wr
, *bad_recv_wr
;
584 struct svc_rdma_op_ctxt
*ctxt
;
591 ctxt
= svc_rdma_get_context(xprt
);
593 ctxt
->direction
= DMA_FROM_DEVICE
;
594 ctxt
->cqe
.done
= svc_rdma_wc_receive
;
595 for (sge_no
= 0; buflen
< xprt
->sc_max_req_size
; sge_no
++) {
596 if (sge_no
>= xprt
->sc_max_sge
) {
597 pr_err("svcrdma: Too many sges (%d)\n", sge_no
);
600 page
= alloc_page(flags
);
603 ctxt
->pages
[sge_no
] = page
;
604 pa
= ib_dma_map_page(xprt
->sc_cm_id
->device
,
607 if (ib_dma_mapping_error(xprt
->sc_cm_id
->device
, pa
))
609 svc_rdma_count_mappings(xprt
, ctxt
);
610 ctxt
->sge
[sge_no
].addr
= pa
;
611 ctxt
->sge
[sge_no
].length
= PAGE_SIZE
;
612 ctxt
->sge
[sge_no
].lkey
= xprt
->sc_pd
->local_dma_lkey
;
613 ctxt
->count
= sge_no
+ 1;
617 recv_wr
.sg_list
= &ctxt
->sge
[0];
618 recv_wr
.num_sge
= ctxt
->count
;
619 recv_wr
.wr_cqe
= &ctxt
->cqe
;
621 svc_xprt_get(&xprt
->sc_xprt
);
622 ret
= ib_post_recv(xprt
->sc_qp
, &recv_wr
, &bad_recv_wr
);
624 svc_rdma_unmap_dma(ctxt
);
625 svc_rdma_put_context(ctxt
, 1);
626 svc_xprt_put(&xprt
->sc_xprt
);
631 svc_rdma_unmap_dma(ctxt
);
632 svc_rdma_put_context(ctxt
, 1);
636 int svc_rdma_repost_recv(struct svcxprt_rdma
*xprt
, gfp_t flags
)
640 ret
= svc_rdma_post_recv(xprt
, flags
);
642 pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
644 pr_err("svcrdma: closing transport %p.\n", xprt
);
645 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
652 svc_rdma_parse_connect_private(struct svcxprt_rdma
*newxprt
,
653 struct rdma_conn_param
*param
)
655 const struct rpcrdma_connect_private
*pmsg
= param
->private_data
;
658 pmsg
->cp_magic
== rpcrdma_cmp_magic
&&
659 pmsg
->cp_version
== RPCRDMA_CMP_VERSION
) {
660 newxprt
->sc_snd_w_inv
= pmsg
->cp_flags
&
661 RPCRDMA_CMP_F_SND_W_INV_OK
;
663 dprintk("svcrdma: client send_size %u, recv_size %u "
664 "remote inv %ssupported\n",
665 rpcrdma_decode_buffer_size(pmsg
->cp_send_size
),
666 rpcrdma_decode_buffer_size(pmsg
->cp_recv_size
),
667 newxprt
->sc_snd_w_inv
? "" : "un");
672 * This function handles the CONNECT_REQUEST event on a listening
673 * endpoint. It is passed the cma_id for the _new_ connection. The context in
674 * this cma_id is inherited from the listening cma_id and is the svc_xprt
675 * structure for the listening endpoint.
677 * This function creates a new xprt for the new connection and enqueues it on
678 * the accept queue for the listent xprt. When the listen thread is kicked, it
679 * will call the recvfrom method on the listen xprt which will accept the new
682 static void handle_connect_req(struct rdma_cm_id
*new_cma_id
,
683 struct rdma_conn_param
*param
)
685 struct svcxprt_rdma
*listen_xprt
= new_cma_id
->context
;
686 struct svcxprt_rdma
*newxprt
;
689 /* Create a new transport */
690 newxprt
= rdma_create_xprt(listen_xprt
->sc_xprt
.xpt_server
, 0);
692 dprintk("svcrdma: failed to create new transport\n");
695 newxprt
->sc_cm_id
= new_cma_id
;
696 new_cma_id
->context
= newxprt
;
697 dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
698 newxprt
, newxprt
->sc_cm_id
, listen_xprt
);
699 svc_rdma_parse_connect_private(newxprt
, param
);
701 /* Save client advertised inbound read limit for use later in accept. */
702 newxprt
->sc_ord
= param
->initiator_depth
;
704 /* Set the local and remote addresses in the transport */
705 sa
= (struct sockaddr
*)&newxprt
->sc_cm_id
->route
.addr
.dst_addr
;
706 svc_xprt_set_remote(&newxprt
->sc_xprt
, sa
, svc_addr_len(sa
));
707 sa
= (struct sockaddr
*)&newxprt
->sc_cm_id
->route
.addr
.src_addr
;
708 svc_xprt_set_local(&newxprt
->sc_xprt
, sa
, svc_addr_len(sa
));
711 * Enqueue the new transport on the accept queue of the listening
714 spin_lock_bh(&listen_xprt
->sc_lock
);
715 list_add_tail(&newxprt
->sc_accept_q
, &listen_xprt
->sc_accept_q
);
716 spin_unlock_bh(&listen_xprt
->sc_lock
);
718 set_bit(XPT_CONN
, &listen_xprt
->sc_xprt
.xpt_flags
);
719 svc_xprt_enqueue(&listen_xprt
->sc_xprt
);
723 * Handles events generated on the listening endpoint. These events will be
724 * either be incoming connect requests or adapter removal events.
726 static int rdma_listen_handler(struct rdma_cm_id
*cma_id
,
727 struct rdma_cm_event
*event
)
729 struct svcxprt_rdma
*xprt
= cma_id
->context
;
732 switch (event
->event
) {
733 case RDMA_CM_EVENT_CONNECT_REQUEST
:
734 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
735 "event = %s (%d)\n", cma_id
, cma_id
->context
,
736 rdma_event_msg(event
->event
), event
->event
);
737 handle_connect_req(cma_id
, &event
->param
.conn
);
740 case RDMA_CM_EVENT_ESTABLISHED
:
741 /* Accept complete */
742 dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
743 "cm_id=%p\n", xprt
, cma_id
);
746 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
747 dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
750 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
754 dprintk("svcrdma: Unexpected event on listening endpoint %p, "
755 "event = %s (%d)\n", cma_id
,
756 rdma_event_msg(event
->event
), event
->event
);
763 static int rdma_cma_handler(struct rdma_cm_id
*cma_id
,
764 struct rdma_cm_event
*event
)
766 struct svc_xprt
*xprt
= cma_id
->context
;
767 struct svcxprt_rdma
*rdma
=
768 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
769 switch (event
->event
) {
770 case RDMA_CM_EVENT_ESTABLISHED
:
771 /* Accept complete */
773 dprintk("svcrdma: Connection completed on DTO xprt=%p, "
774 "cm_id=%p\n", xprt
, cma_id
);
775 clear_bit(RDMAXPRT_CONN_PENDING
, &rdma
->sc_flags
);
776 svc_xprt_enqueue(xprt
);
778 case RDMA_CM_EVENT_DISCONNECTED
:
779 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
782 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
783 svc_xprt_enqueue(xprt
);
787 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
788 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
789 "event = %s (%d)\n", cma_id
, xprt
,
790 rdma_event_msg(event
->event
), event
->event
);
792 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
793 svc_xprt_enqueue(xprt
);
798 dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
799 "event = %s (%d)\n", cma_id
,
800 rdma_event_msg(event
->event
), event
->event
);
807 * Create a listening RDMA service endpoint.
809 static struct svc_xprt
*svc_rdma_create(struct svc_serv
*serv
,
811 struct sockaddr
*sa
, int salen
,
814 struct rdma_cm_id
*listen_id
;
815 struct svcxprt_rdma
*cma_xprt
;
818 dprintk("svcrdma: Creating RDMA socket\n");
819 if ((sa
->sa_family
!= AF_INET
) && (sa
->sa_family
!= AF_INET6
)) {
820 dprintk("svcrdma: Address family %d is not supported.\n", sa
->sa_family
);
821 return ERR_PTR(-EAFNOSUPPORT
);
823 cma_xprt
= rdma_create_xprt(serv
, 1);
825 return ERR_PTR(-ENOMEM
);
827 listen_id
= rdma_create_id(&init_net
, rdma_listen_handler
, cma_xprt
,
828 RDMA_PS_TCP
, IB_QPT_RC
);
829 if (IS_ERR(listen_id
)) {
830 ret
= PTR_ERR(listen_id
);
831 dprintk("svcrdma: rdma_create_id failed = %d\n", ret
);
835 /* Allow both IPv4 and IPv6 sockets to bind a single port
838 #if IS_ENABLED(CONFIG_IPV6)
839 ret
= rdma_set_afonly(listen_id
, 1);
841 dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret
);
845 ret
= rdma_bind_addr(listen_id
, sa
);
847 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret
);
850 cma_xprt
->sc_cm_id
= listen_id
;
852 ret
= rdma_listen(listen_id
, RPCRDMA_LISTEN_BACKLOG
);
854 dprintk("svcrdma: rdma_listen failed = %d\n", ret
);
859 * We need to use the address from the cm_id in case the
860 * caller specified 0 for the port number.
862 sa
= (struct sockaddr
*)&cma_xprt
->sc_cm_id
->route
.addr
.src_addr
;
863 svc_xprt_set_local(&cma_xprt
->sc_xprt
, sa
, salen
);
865 return &cma_xprt
->sc_xprt
;
868 rdma_destroy_id(listen_id
);
874 static struct svc_rdma_fastreg_mr
*rdma_alloc_frmr(struct svcxprt_rdma
*xprt
)
877 struct scatterlist
*sg
;
878 struct svc_rdma_fastreg_mr
*frmr
;
881 frmr
= kmalloc(sizeof(*frmr
), GFP_KERNEL
);
885 num_sg
= min_t(u32
, RPCSVC_MAXPAGES
, xprt
->sc_frmr_pg_list_len
);
886 mr
= ib_alloc_mr(xprt
->sc_pd
, IB_MR_TYPE_MEM_REG
, num_sg
);
890 sg
= kcalloc(RPCSVC_MAXPAGES
, sizeof(*sg
), GFP_KERNEL
);
894 sg_init_table(sg
, RPCSVC_MAXPAGES
);
898 INIT_LIST_HEAD(&frmr
->frmr_list
);
906 return ERR_PTR(-ENOMEM
);
909 static void rdma_dealloc_frmr_q(struct svcxprt_rdma
*xprt
)
911 struct svc_rdma_fastreg_mr
*frmr
;
913 while (!list_empty(&xprt
->sc_frmr_q
)) {
914 frmr
= list_entry(xprt
->sc_frmr_q
.next
,
915 struct svc_rdma_fastreg_mr
, frmr_list
);
916 list_del_init(&frmr
->frmr_list
);
918 ib_dereg_mr(frmr
->mr
);
923 struct svc_rdma_fastreg_mr
*svc_rdma_get_frmr(struct svcxprt_rdma
*rdma
)
925 struct svc_rdma_fastreg_mr
*frmr
= NULL
;
927 spin_lock_bh(&rdma
->sc_frmr_q_lock
);
928 if (!list_empty(&rdma
->sc_frmr_q
)) {
929 frmr
= list_entry(rdma
->sc_frmr_q
.next
,
930 struct svc_rdma_fastreg_mr
, frmr_list
);
931 list_del_init(&frmr
->frmr_list
);
934 spin_unlock_bh(&rdma
->sc_frmr_q_lock
);
938 return rdma_alloc_frmr(rdma
);
941 void svc_rdma_put_frmr(struct svcxprt_rdma
*rdma
,
942 struct svc_rdma_fastreg_mr
*frmr
)
945 ib_dma_unmap_sg(rdma
->sc_cm_id
->device
,
946 frmr
->sg
, frmr
->sg_nents
, frmr
->direction
);
947 atomic_dec(&rdma
->sc_dma_used
);
948 spin_lock_bh(&rdma
->sc_frmr_q_lock
);
949 WARN_ON_ONCE(!list_empty(&frmr
->frmr_list
));
950 list_add(&frmr
->frmr_list
, &rdma
->sc_frmr_q
);
951 spin_unlock_bh(&rdma
->sc_frmr_q_lock
);
956 * This is the xpo_recvfrom function for listening endpoints. Its
957 * purpose is to accept incoming connections. The CMA callback handler
958 * has already created a new transport and attached it to the new CMA
961 * There is a queue of pending connections hung on the listening
962 * transport. This queue contains the new svc_xprt structure. This
963 * function takes svc_xprt structures off the accept_q and completes
966 static struct svc_xprt
*svc_rdma_accept(struct svc_xprt
*xprt
)
968 struct svcxprt_rdma
*listen_rdma
;
969 struct svcxprt_rdma
*newxprt
= NULL
;
970 struct rdma_conn_param conn_param
;
971 struct rpcrdma_connect_private pmsg
;
972 struct ib_qp_init_attr qp_attr
;
973 struct ib_device
*dev
;
977 listen_rdma
= container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
978 clear_bit(XPT_CONN
, &xprt
->xpt_flags
);
979 /* Get the next entry off the accept list */
980 spin_lock_bh(&listen_rdma
->sc_lock
);
981 if (!list_empty(&listen_rdma
->sc_accept_q
)) {
982 newxprt
= list_entry(listen_rdma
->sc_accept_q
.next
,
983 struct svcxprt_rdma
, sc_accept_q
);
984 list_del_init(&newxprt
->sc_accept_q
);
986 if (!list_empty(&listen_rdma
->sc_accept_q
))
987 set_bit(XPT_CONN
, &listen_rdma
->sc_xprt
.xpt_flags
);
988 spin_unlock_bh(&listen_rdma
->sc_lock
);
992 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
993 newxprt
, newxprt
->sc_cm_id
);
995 dev
= newxprt
->sc_cm_id
->device
;
997 /* Qualify the transport resource defaults with the
998 * capabilities of this particular device */
999 newxprt
->sc_max_sge
= min((size_t)dev
->attrs
.max_sge
,
1000 (size_t)RPCSVC_MAXPAGES
);
1001 newxprt
->sc_max_sge_rd
= min_t(size_t, dev
->attrs
.max_sge_rd
,
1003 newxprt
->sc_max_req_size
= svcrdma_max_req_size
;
1004 newxprt
->sc_max_requests
= min_t(u32
, dev
->attrs
.max_qp_wr
,
1005 svcrdma_max_requests
);
1006 newxprt
->sc_max_bc_requests
= min_t(u32
, dev
->attrs
.max_qp_wr
,
1007 svcrdma_max_bc_requests
);
1008 newxprt
->sc_rq_depth
= newxprt
->sc_max_requests
+
1009 newxprt
->sc_max_bc_requests
;
1010 newxprt
->sc_sq_depth
= RPCRDMA_SQ_DEPTH_MULT
* newxprt
->sc_rq_depth
;
1012 if (!svc_rdma_prealloc_ctxts(newxprt
))
1014 if (!svc_rdma_prealloc_maps(newxprt
))
1018 * Limit ORD based on client limit, local device limit, and
1019 * configured svcrdma limit.
1021 newxprt
->sc_ord
= min_t(size_t, dev
->attrs
.max_qp_rd_atom
, newxprt
->sc_ord
);
1022 newxprt
->sc_ord
= min_t(size_t, svcrdma_ord
, newxprt
->sc_ord
);
1024 newxprt
->sc_pd
= ib_alloc_pd(dev
, 0);
1025 if (IS_ERR(newxprt
->sc_pd
)) {
1026 dprintk("svcrdma: error creating PD for connect request\n");
1029 newxprt
->sc_sq_cq
= ib_alloc_cq(dev
, newxprt
, newxprt
->sc_sq_depth
,
1030 0, IB_POLL_SOFTIRQ
);
1031 if (IS_ERR(newxprt
->sc_sq_cq
)) {
1032 dprintk("svcrdma: error creating SQ CQ for connect request\n");
1035 newxprt
->sc_rq_cq
= ib_alloc_cq(dev
, newxprt
, newxprt
->sc_rq_depth
,
1036 0, IB_POLL_SOFTIRQ
);
1037 if (IS_ERR(newxprt
->sc_rq_cq
)) {
1038 dprintk("svcrdma: error creating RQ CQ for connect request\n");
1042 memset(&qp_attr
, 0, sizeof qp_attr
);
1043 qp_attr
.event_handler
= qp_event_handler
;
1044 qp_attr
.qp_context
= &newxprt
->sc_xprt
;
1045 qp_attr
.cap
.max_send_wr
= newxprt
->sc_sq_depth
;
1046 qp_attr
.cap
.max_recv_wr
= newxprt
->sc_rq_depth
;
1047 qp_attr
.cap
.max_send_sge
= newxprt
->sc_max_sge
;
1048 qp_attr
.cap
.max_recv_sge
= newxprt
->sc_max_sge
;
1049 qp_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
1050 qp_attr
.qp_type
= IB_QPT_RC
;
1051 qp_attr
.send_cq
= newxprt
->sc_sq_cq
;
1052 qp_attr
.recv_cq
= newxprt
->sc_rq_cq
;
1053 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
1054 " cm_id->device=%p, sc_pd->device=%p\n"
1055 " cap.max_send_wr = %d\n"
1056 " cap.max_recv_wr = %d\n"
1057 " cap.max_send_sge = %d\n"
1058 " cap.max_recv_sge = %d\n",
1059 newxprt
->sc_cm_id
, newxprt
->sc_pd
,
1060 dev
, newxprt
->sc_pd
->device
,
1061 qp_attr
.cap
.max_send_wr
,
1062 qp_attr
.cap
.max_recv_wr
,
1063 qp_attr
.cap
.max_send_sge
,
1064 qp_attr
.cap
.max_recv_sge
);
1066 ret
= rdma_create_qp(newxprt
->sc_cm_id
, newxprt
->sc_pd
, &qp_attr
);
1068 dprintk("svcrdma: failed to create QP, ret=%d\n", ret
);
1071 newxprt
->sc_qp
= newxprt
->sc_cm_id
->qp
;
1074 * Use the most secure set of MR resources based on the
1075 * transport type and available memory management features in
1076 * the device. Here's the table implemented below:
1078 * Fast Global DMA Remote WR
1079 * Reg LKEY MR Access
1080 * Sup'd Sup'd Needed Needed
1092 * NB: iWARP requires remote write access for the data sink
1093 * of an RDMA_READ. IB does not.
1095 newxprt
->sc_reader
= rdma_read_chunk_lcl
;
1096 if (dev
->attrs
.device_cap_flags
& IB_DEVICE_MEM_MGT_EXTENSIONS
) {
1097 newxprt
->sc_frmr_pg_list_len
=
1098 dev
->attrs
.max_fast_reg_page_list_len
;
1099 newxprt
->sc_dev_caps
|= SVCRDMA_DEVCAP_FAST_REG
;
1100 newxprt
->sc_reader
= rdma_read_chunk_frmr
;
1102 newxprt
->sc_snd_w_inv
= false;
1105 * Determine if a DMA MR is required and if so, what privs are required
1107 if (!rdma_protocol_iwarp(dev
, newxprt
->sc_cm_id
->port_num
) &&
1108 !rdma_ib_or_roce(dev
, newxprt
->sc_cm_id
->port_num
))
1111 if (rdma_protocol_iwarp(dev
, newxprt
->sc_cm_id
->port_num
))
1112 newxprt
->sc_dev_caps
|= SVCRDMA_DEVCAP_READ_W_INV
;
1114 /* Post receive buffers */
1115 for (i
= 0; i
< newxprt
->sc_max_requests
; i
++) {
1116 ret
= svc_rdma_post_recv(newxprt
, GFP_KERNEL
);
1118 dprintk("svcrdma: failure posting receive buffers\n");
1123 /* Swap out the handler */
1124 newxprt
->sc_cm_id
->event_handler
= rdma_cma_handler
;
1126 /* Construct RDMA-CM private message */
1127 pmsg
.cp_magic
= rpcrdma_cmp_magic
;
1128 pmsg
.cp_version
= RPCRDMA_CMP_VERSION
;
1130 pmsg
.cp_send_size
= pmsg
.cp_recv_size
=
1131 rpcrdma_encode_buffer_size(newxprt
->sc_max_req_size
);
1133 /* Accept Connection */
1134 set_bit(RDMAXPRT_CONN_PENDING
, &newxprt
->sc_flags
);
1135 memset(&conn_param
, 0, sizeof conn_param
);
1136 conn_param
.responder_resources
= 0;
1137 conn_param
.initiator_depth
= newxprt
->sc_ord
;
1138 conn_param
.private_data
= &pmsg
;
1139 conn_param
.private_data_len
= sizeof(pmsg
);
1140 ret
= rdma_accept(newxprt
->sc_cm_id
, &conn_param
);
1142 dprintk("svcrdma: failed to accept new connection, ret=%d\n",
1147 dprintk("svcrdma: new connection %p accepted with the following "
1149 " local_ip : %pI4\n"
1150 " local_port : %d\n"
1151 " remote_ip : %pI4\n"
1152 " remote_port : %d\n"
1154 " max_sge_rd : %d\n"
1156 " max_requests : %d\n"
1159 &((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
1160 route
.addr
.src_addr
)->sin_addr
.s_addr
,
1161 ntohs(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
1162 route
.addr
.src_addr
)->sin_port
),
1163 &((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
1164 route
.addr
.dst_addr
)->sin_addr
.s_addr
,
1165 ntohs(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
1166 route
.addr
.dst_addr
)->sin_port
),
1167 newxprt
->sc_max_sge
,
1168 newxprt
->sc_max_sge_rd
,
1169 newxprt
->sc_sq_depth
,
1170 newxprt
->sc_max_requests
,
1173 return &newxprt
->sc_xprt
;
1176 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret
);
1177 /* Take a reference in case the DTO handler runs */
1178 svc_xprt_get(&newxprt
->sc_xprt
);
1179 if (newxprt
->sc_qp
&& !IS_ERR(newxprt
->sc_qp
))
1180 ib_destroy_qp(newxprt
->sc_qp
);
1181 rdma_destroy_id(newxprt
->sc_cm_id
);
1182 /* This call to put will destroy the transport */
1183 svc_xprt_put(&newxprt
->sc_xprt
);
1187 static void svc_rdma_release_rqst(struct svc_rqst
*rqstp
)
1192 * When connected, an svc_xprt has at least two references:
1194 * - A reference held by the cm_id between the ESTABLISHED and
1195 * DISCONNECTED events. If the remote peer disconnected first, this
1196 * reference could be gone.
1198 * - A reference held by the svc_recv code that called this function
1199 * as part of close processing.
1201 * At a minimum one references should still be held.
1203 static void svc_rdma_detach(struct svc_xprt
*xprt
)
1205 struct svcxprt_rdma
*rdma
=
1206 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
1207 dprintk("svc: svc_rdma_detach(%p)\n", xprt
);
1209 /* Disconnect and flush posted WQE */
1210 rdma_disconnect(rdma
->sc_cm_id
);
1213 static void __svc_rdma_free(struct work_struct
*work
)
1215 struct svcxprt_rdma
*rdma
=
1216 container_of(work
, struct svcxprt_rdma
, sc_work
);
1217 struct svc_xprt
*xprt
= &rdma
->sc_xprt
;
1219 dprintk("svcrdma: %s(%p)\n", __func__
, rdma
);
1221 if (rdma
->sc_qp
&& !IS_ERR(rdma
->sc_qp
))
1222 ib_drain_qp(rdma
->sc_qp
);
1224 /* We should only be called from kref_put */
1225 if (atomic_read(&xprt
->xpt_ref
.refcount
) != 0)
1226 pr_err("svcrdma: sc_xprt still in use? (%d)\n",
1227 atomic_read(&xprt
->xpt_ref
.refcount
));
1230 * Destroy queued, but not processed read completions. Note
1231 * that this cleanup has to be done before destroying the
1232 * cm_id because the device ptr is needed to unmap the dma in
1233 * svc_rdma_put_context.
1235 while (!list_empty(&rdma
->sc_read_complete_q
)) {
1236 struct svc_rdma_op_ctxt
*ctxt
;
1237 ctxt
= list_entry(rdma
->sc_read_complete_q
.next
,
1238 struct svc_rdma_op_ctxt
,
1240 list_del_init(&ctxt
->dto_q
);
1241 svc_rdma_put_context(ctxt
, 1);
1244 /* Destroy queued, but not processed recv completions */
1245 while (!list_empty(&rdma
->sc_rq_dto_q
)) {
1246 struct svc_rdma_op_ctxt
*ctxt
;
1247 ctxt
= list_entry(rdma
->sc_rq_dto_q
.next
,
1248 struct svc_rdma_op_ctxt
,
1250 list_del_init(&ctxt
->dto_q
);
1251 svc_rdma_put_context(ctxt
, 1);
1254 /* Warn if we leaked a resource or under-referenced */
1255 if (rdma
->sc_ctxt_used
!= 0)
1256 pr_err("svcrdma: ctxt still in use? (%d)\n",
1257 rdma
->sc_ctxt_used
);
1258 if (atomic_read(&rdma
->sc_dma_used
) != 0)
1259 pr_err("svcrdma: dma still in use? (%d)\n",
1260 atomic_read(&rdma
->sc_dma_used
));
1262 /* Final put of backchannel client transport */
1263 if (xprt
->xpt_bc_xprt
) {
1264 xprt_put(xprt
->xpt_bc_xprt
);
1265 xprt
->xpt_bc_xprt
= NULL
;
1268 rdma_dealloc_frmr_q(rdma
);
1269 svc_rdma_destroy_ctxts(rdma
);
1270 svc_rdma_destroy_maps(rdma
);
1272 /* Destroy the QP if present (not a listener) */
1273 if (rdma
->sc_qp
&& !IS_ERR(rdma
->sc_qp
))
1274 ib_destroy_qp(rdma
->sc_qp
);
1276 if (rdma
->sc_sq_cq
&& !IS_ERR(rdma
->sc_sq_cq
))
1277 ib_free_cq(rdma
->sc_sq_cq
);
1279 if (rdma
->sc_rq_cq
&& !IS_ERR(rdma
->sc_rq_cq
))
1280 ib_free_cq(rdma
->sc_rq_cq
);
1282 if (rdma
->sc_pd
&& !IS_ERR(rdma
->sc_pd
))
1283 ib_dealloc_pd(rdma
->sc_pd
);
1285 /* Destroy the CM ID */
1286 rdma_destroy_id(rdma
->sc_cm_id
);
1291 static void svc_rdma_free(struct svc_xprt
*xprt
)
1293 struct svcxprt_rdma
*rdma
=
1294 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
1295 INIT_WORK(&rdma
->sc_work
, __svc_rdma_free
);
1296 queue_work(svc_rdma_wq
, &rdma
->sc_work
);
1299 static int svc_rdma_has_wspace(struct svc_xprt
*xprt
)
1301 struct svcxprt_rdma
*rdma
=
1302 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
1305 * If there are already waiters on the SQ,
1308 if (waitqueue_active(&rdma
->sc_send_wait
))
1311 /* Otherwise return true. */
1315 static int svc_rdma_secure_port(struct svc_rqst
*rqstp
)
1320 int svc_rdma_send(struct svcxprt_rdma
*xprt
, struct ib_send_wr
*wr
)
1322 struct ib_send_wr
*bad_wr
, *n_wr
;
1327 if (test_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
))
1331 for (n_wr
= wr
->next
; n_wr
; n_wr
= n_wr
->next
)
1334 /* If the SQ is full, wait until an SQ entry is available */
1336 spin_lock_bh(&xprt
->sc_lock
);
1337 if (xprt
->sc_sq_depth
< atomic_read(&xprt
->sc_sq_count
) + wr_count
) {
1338 spin_unlock_bh(&xprt
->sc_lock
);
1339 atomic_inc(&rdma_stat_sq_starve
);
1341 /* Wait until SQ WR available if SQ still full */
1342 wait_event(xprt
->sc_send_wait
,
1343 atomic_read(&xprt
->sc_sq_count
) <
1345 if (test_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
))
1349 /* Take a transport ref for each WR posted */
1350 for (i
= 0; i
< wr_count
; i
++)
1351 svc_xprt_get(&xprt
->sc_xprt
);
1353 /* Bump used SQ WR count and post */
1354 atomic_add(wr_count
, &xprt
->sc_sq_count
);
1355 ret
= ib_post_send(xprt
->sc_qp
, wr
, &bad_wr
);
1357 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
1358 atomic_sub(wr_count
, &xprt
->sc_sq_count
);
1359 for (i
= 0; i
< wr_count
; i
++)
1360 svc_xprt_put(&xprt
->sc_xprt
);
1361 dprintk("svcrdma: failed to post SQ WR rc=%d, "
1362 "sc_sq_count=%d, sc_sq_depth=%d\n",
1363 ret
, atomic_read(&xprt
->sc_sq_count
),
1366 spin_unlock_bh(&xprt
->sc_lock
);
1368 wake_up(&xprt
->sc_send_wait
);