2 * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
17 * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
22 * Neither the name of the Network Appliance, Inc. nor the names of
23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * Author: Tom Tucker <tom@opengridcomputing.com>
42 #include <linux/sunrpc/svc_xprt.h>
43 #include <linux/sunrpc/debug.h>
44 #include <linux/sunrpc/rpc_rdma.h>
45 #include <linux/spinlock.h>
46 #include <rdma/ib_verbs.h>
47 #include <rdma/rdma_cm.h>
48 #include <linux/sunrpc/svc_rdma.h>
50 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
52 static struct svc_xprt
*svc_rdma_create(struct svc_serv
*serv
,
53 struct sockaddr
*sa
, int salen
,
55 static struct svc_xprt
*svc_rdma_accept(struct svc_xprt
*xprt
);
56 static void svc_rdma_release_rqst(struct svc_rqst
*);
57 static void dto_tasklet_func(unsigned long data
);
58 static void svc_rdma_detach(struct svc_xprt
*xprt
);
59 static void svc_rdma_free(struct svc_xprt
*xprt
);
60 static int svc_rdma_has_wspace(struct svc_xprt
*xprt
);
61 static void rq_cq_reap(struct svcxprt_rdma
*xprt
);
62 static void sq_cq_reap(struct svcxprt_rdma
*xprt
);
64 DECLARE_TASKLET(dto_tasklet
, dto_tasklet_func
, 0UL);
65 static DEFINE_SPINLOCK(dto_lock
);
66 static LIST_HEAD(dto_xprt_q
);
68 static struct svc_xprt_ops svc_rdma_ops
= {
69 .xpo_create
= svc_rdma_create
,
70 .xpo_recvfrom
= svc_rdma_recvfrom
,
71 .xpo_sendto
= svc_rdma_sendto
,
72 .xpo_release_rqst
= svc_rdma_release_rqst
,
73 .xpo_detach
= svc_rdma_detach
,
74 .xpo_free
= svc_rdma_free
,
75 .xpo_prep_reply_hdr
= svc_rdma_prep_reply_hdr
,
76 .xpo_has_wspace
= svc_rdma_has_wspace
,
77 .xpo_accept
= svc_rdma_accept
,
80 struct svc_xprt_class svc_rdma_class
= {
82 .xcl_owner
= THIS_MODULE
,
83 .xcl_ops
= &svc_rdma_ops
,
84 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_TCP
,
87 static int rdma_bump_context_cache(struct svcxprt_rdma
*xprt
)
91 struct svc_rdma_op_ctxt
*ctxt
;
93 target
= min(xprt
->sc_ctxt_cnt
+ xprt
->sc_ctxt_bump
,
96 spin_lock_bh(&xprt
->sc_ctxt_lock
);
97 while (xprt
->sc_ctxt_cnt
< target
) {
99 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
101 ctxt
= kmalloc(sizeof(*ctxt
), GFP_KERNEL
);
103 spin_lock_bh(&xprt
->sc_ctxt_lock
);
106 INIT_LIST_HEAD(&ctxt
->free_list
);
107 list_add(&ctxt
->free_list
, &xprt
->sc_ctxt_free
);
109 /* kmalloc failed...give up for now */
114 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
115 dprintk("svcrdma: sc_ctxt_max=%d, sc_ctxt_cnt=%d\n",
116 xprt
->sc_ctxt_max
, xprt
->sc_ctxt_cnt
);
120 struct svc_rdma_op_ctxt
*svc_rdma_get_context(struct svcxprt_rdma
*xprt
)
122 struct svc_rdma_op_ctxt
*ctxt
;
125 spin_lock_bh(&xprt
->sc_ctxt_lock
);
126 if (unlikely(list_empty(&xprt
->sc_ctxt_free
))) {
127 /* Try to bump my cache. */
128 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
130 if (rdma_bump_context_cache(xprt
))
133 printk(KERN_INFO
"svcrdma: sleeping waiting for "
134 "context memory on xprt=%p\n",
136 schedule_timeout_uninterruptible(msecs_to_jiffies(500));
139 ctxt
= list_entry(xprt
->sc_ctxt_free
.next
,
140 struct svc_rdma_op_ctxt
,
142 list_del_init(&ctxt
->free_list
);
143 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
145 INIT_LIST_HEAD(&ctxt
->dto_q
);
147 atomic_inc(&xprt
->sc_ctxt_used
);
153 void svc_rdma_put_context(struct svc_rdma_op_ctxt
*ctxt
, int free_pages
)
155 struct svcxprt_rdma
*xprt
;
161 for (i
= 0; i
< ctxt
->count
; i
++)
162 put_page(ctxt
->pages
[i
]);
164 for (i
= 0; i
< ctxt
->count
; i
++)
165 dma_unmap_single(xprt
->sc_cm_id
->device
->dma_device
,
170 spin_lock_bh(&xprt
->sc_ctxt_lock
);
171 list_add(&ctxt
->free_list
, &xprt
->sc_ctxt_free
);
172 spin_unlock_bh(&xprt
->sc_ctxt_lock
);
173 atomic_dec(&xprt
->sc_ctxt_used
);
176 /* ib_cq event handler */
177 static void cq_event_handler(struct ib_event
*event
, void *context
)
179 struct svc_xprt
*xprt
= context
;
180 dprintk("svcrdma: received CQ event id=%d, context=%p\n",
181 event
->event
, context
);
182 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
185 /* QP event handler */
186 static void qp_event_handler(struct ib_event
*event
, void *context
)
188 struct svc_xprt
*xprt
= context
;
190 switch (event
->event
) {
191 /* These are considered benign events */
192 case IB_EVENT_PATH_MIG
:
193 case IB_EVENT_COMM_EST
:
194 case IB_EVENT_SQ_DRAINED
:
195 case IB_EVENT_QP_LAST_WQE_REACHED
:
196 dprintk("svcrdma: QP event %d received for QP=%p\n",
197 event
->event
, event
->element
.qp
);
199 /* These are considered fatal events */
200 case IB_EVENT_PATH_MIG_ERR
:
201 case IB_EVENT_QP_FATAL
:
202 case IB_EVENT_QP_REQ_ERR
:
203 case IB_EVENT_QP_ACCESS_ERR
:
204 case IB_EVENT_DEVICE_FATAL
:
206 dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
207 "closing transport\n",
208 event
->event
, event
->element
.qp
);
209 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
215 * Data Transfer Operation Tasklet
217 * Walks a list of transports with I/O pending, removing entries as
218 * they are added to the server's I/O pending list. Two bits indicate
219 * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
220 * spinlock that serializes access to the transport list with the RQ
221 * and SQ interrupt handlers.
223 static void dto_tasklet_func(unsigned long data
)
225 struct svcxprt_rdma
*xprt
;
228 spin_lock_irqsave(&dto_lock
, flags
);
229 while (!list_empty(&dto_xprt_q
)) {
230 xprt
= list_entry(dto_xprt_q
.next
,
231 struct svcxprt_rdma
, sc_dto_q
);
232 list_del_init(&xprt
->sc_dto_q
);
233 spin_unlock_irqrestore(&dto_lock
, flags
);
238 svc_xprt_put(&xprt
->sc_xprt
);
239 spin_lock_irqsave(&dto_lock
, flags
);
241 spin_unlock_irqrestore(&dto_lock
, flags
);
245 * Receive Queue Completion Handler
247 * Since an RQ completion handler is called on interrupt context, we
248 * need to defer the handling of the I/O to a tasklet
250 static void rq_comp_handler(struct ib_cq
*cq
, void *cq_context
)
252 struct svcxprt_rdma
*xprt
= cq_context
;
256 * Set the bit regardless of whether or not it's on the list
257 * because it may be on the list already due to an SQ
260 set_bit(RDMAXPRT_RQ_PENDING
, &xprt
->sc_flags
);
263 * If this transport is not already on the DTO transport queue,
266 spin_lock_irqsave(&dto_lock
, flags
);
267 if (list_empty(&xprt
->sc_dto_q
)) {
268 svc_xprt_get(&xprt
->sc_xprt
);
269 list_add_tail(&xprt
->sc_dto_q
, &dto_xprt_q
);
271 spin_unlock_irqrestore(&dto_lock
, flags
);
273 /* Tasklet does all the work to avoid irqsave locks. */
274 tasklet_schedule(&dto_tasklet
);
278 * rq_cq_reap - Process the RQ CQ.
280 * Take all completing WC off the CQE and enqueue the associated DTO
281 * context on the dto_q for the transport.
283 static void rq_cq_reap(struct svcxprt_rdma
*xprt
)
287 struct svc_rdma_op_ctxt
*ctxt
= NULL
;
289 if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING
, &xprt
->sc_flags
))
292 ib_req_notify_cq(xprt
->sc_rq_cq
, IB_CQ_NEXT_COMP
);
293 atomic_inc(&rdma_stat_rq_poll
);
295 spin_lock_bh(&xprt
->sc_rq_dto_lock
);
296 while ((ret
= ib_poll_cq(xprt
->sc_rq_cq
, 1, &wc
)) > 0) {
297 ctxt
= (struct svc_rdma_op_ctxt
*)(unsigned long)wc
.wr_id
;
298 ctxt
->wc_status
= wc
.status
;
299 ctxt
->byte_len
= wc
.byte_len
;
300 if (wc
.status
!= IB_WC_SUCCESS
) {
301 /* Close the transport */
302 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
303 svc_rdma_put_context(ctxt
, 1);
306 list_add_tail(&ctxt
->dto_q
, &xprt
->sc_rq_dto_q
);
308 spin_unlock_bh(&xprt
->sc_rq_dto_lock
);
311 atomic_inc(&rdma_stat_rq_prod
);
313 set_bit(XPT_DATA
, &xprt
->sc_xprt
.xpt_flags
);
315 * If data arrived before established event,
316 * don't enqueue. This defers RPC I/O until the
317 * RDMA connection is complete.
319 if (!test_bit(RDMAXPRT_CONN_PENDING
, &xprt
->sc_flags
))
320 svc_xprt_enqueue(&xprt
->sc_xprt
);
324 * Send Queue Completion Handler - potentially called on interrupt context.
326 static void sq_cq_reap(struct svcxprt_rdma
*xprt
)
328 struct svc_rdma_op_ctxt
*ctxt
= NULL
;
330 struct ib_cq
*cq
= xprt
->sc_sq_cq
;
334 if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING
, &xprt
->sc_flags
))
337 ib_req_notify_cq(xprt
->sc_sq_cq
, IB_CQ_NEXT_COMP
);
338 atomic_inc(&rdma_stat_sq_poll
);
339 while ((ret
= ib_poll_cq(cq
, 1, &wc
)) > 0) {
340 ctxt
= (struct svc_rdma_op_ctxt
*)(unsigned long)wc
.wr_id
;
343 if (wc
.status
!= IB_WC_SUCCESS
)
344 /* Close the transport */
345 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
347 /* Decrement used SQ WR count */
348 atomic_dec(&xprt
->sc_sq_count
);
349 wake_up(&xprt
->sc_send_wait
);
351 switch (ctxt
->wr_op
) {
353 case IB_WR_RDMA_WRITE
:
354 svc_rdma_put_context(ctxt
, 1);
357 case IB_WR_RDMA_READ
:
358 if (test_bit(RDMACTXT_F_LAST_CTXT
, &ctxt
->flags
)) {
359 struct svc_rdma_op_ctxt
*read_hdr
= ctxt
->read_hdr
;
361 set_bit(XPT_DATA
, &xprt
->sc_xprt
.xpt_flags
);
362 spin_lock_bh(&xprt
->sc_read_complete_lock
);
363 list_add_tail(&read_hdr
->dto_q
,
364 &xprt
->sc_read_complete_q
);
365 spin_unlock_bh(&xprt
->sc_read_complete_lock
);
366 svc_xprt_enqueue(&xprt
->sc_xprt
);
368 svc_rdma_put_context(ctxt
, 0);
372 printk(KERN_ERR
"svcrdma: unexpected completion type, "
373 "opcode=%d, status=%d\n",
374 wc
.opcode
, wc
.status
);
380 atomic_inc(&rdma_stat_sq_prod
);
383 static void sq_comp_handler(struct ib_cq
*cq
, void *cq_context
)
385 struct svcxprt_rdma
*xprt
= cq_context
;
389 * Set the bit regardless of whether or not it's on the list
390 * because it may be on the list already due to an RQ
393 set_bit(RDMAXPRT_SQ_PENDING
, &xprt
->sc_flags
);
396 * If this transport is not already on the DTO transport queue,
399 spin_lock_irqsave(&dto_lock
, flags
);
400 if (list_empty(&xprt
->sc_dto_q
)) {
401 svc_xprt_get(&xprt
->sc_xprt
);
402 list_add_tail(&xprt
->sc_dto_q
, &dto_xprt_q
);
404 spin_unlock_irqrestore(&dto_lock
, flags
);
406 /* Tasklet does all the work to avoid irqsave locks. */
407 tasklet_schedule(&dto_tasklet
);
410 static void create_context_cache(struct svcxprt_rdma
*xprt
,
411 int ctxt_count
, int ctxt_bump
, int ctxt_max
)
413 struct svc_rdma_op_ctxt
*ctxt
;
416 xprt
->sc_ctxt_max
= ctxt_max
;
417 xprt
->sc_ctxt_bump
= ctxt_bump
;
418 xprt
->sc_ctxt_cnt
= 0;
419 atomic_set(&xprt
->sc_ctxt_used
, 0);
421 INIT_LIST_HEAD(&xprt
->sc_ctxt_free
);
422 for (i
= 0; i
< ctxt_count
; i
++) {
423 ctxt
= kmalloc(sizeof(*ctxt
), GFP_KERNEL
);
425 INIT_LIST_HEAD(&ctxt
->free_list
);
426 list_add(&ctxt
->free_list
, &xprt
->sc_ctxt_free
);
432 static void destroy_context_cache(struct svcxprt_rdma
*xprt
)
434 while (!list_empty(&xprt
->sc_ctxt_free
)) {
435 struct svc_rdma_op_ctxt
*ctxt
;
436 ctxt
= list_entry(xprt
->sc_ctxt_free
.next
,
437 struct svc_rdma_op_ctxt
,
439 list_del_init(&ctxt
->free_list
);
444 static struct svcxprt_rdma
*rdma_create_xprt(struct svc_serv
*serv
,
447 struct svcxprt_rdma
*cma_xprt
= kzalloc(sizeof *cma_xprt
, GFP_KERNEL
);
451 svc_xprt_init(&svc_rdma_class
, &cma_xprt
->sc_xprt
, serv
);
452 INIT_LIST_HEAD(&cma_xprt
->sc_accept_q
);
453 INIT_LIST_HEAD(&cma_xprt
->sc_dto_q
);
454 INIT_LIST_HEAD(&cma_xprt
->sc_rq_dto_q
);
455 INIT_LIST_HEAD(&cma_xprt
->sc_read_complete_q
);
456 init_waitqueue_head(&cma_xprt
->sc_send_wait
);
458 spin_lock_init(&cma_xprt
->sc_lock
);
459 spin_lock_init(&cma_xprt
->sc_read_complete_lock
);
460 spin_lock_init(&cma_xprt
->sc_ctxt_lock
);
461 spin_lock_init(&cma_xprt
->sc_rq_dto_lock
);
463 cma_xprt
->sc_ord
= svcrdma_ord
;
465 cma_xprt
->sc_max_req_size
= svcrdma_max_req_size
;
466 cma_xprt
->sc_max_requests
= svcrdma_max_requests
;
467 cma_xprt
->sc_sq_depth
= svcrdma_max_requests
* RPCRDMA_SQ_DEPTH_MULT
;
468 atomic_set(&cma_xprt
->sc_sq_count
, 0);
471 int reqs
= cma_xprt
->sc_max_requests
;
472 create_context_cache(cma_xprt
,
473 reqs
<< 1, /* starting size */
474 reqs
, /* bump amount */
476 cma_xprt
->sc_sq_depth
+
477 RPCRDMA_MAX_THREADS
+ 1); /* max */
478 if (list_empty(&cma_xprt
->sc_ctxt_free
)) {
482 clear_bit(XPT_LISTENER
, &cma_xprt
->sc_xprt
.xpt_flags
);
484 set_bit(XPT_LISTENER
, &cma_xprt
->sc_xprt
.xpt_flags
);
489 struct page
*svc_rdma_get_page(void)
493 while ((page
= alloc_page(GFP_KERNEL
)) == NULL
) {
494 /* If we can't get memory, wait a bit and try again */
495 printk(KERN_INFO
"svcrdma: out of memory...retrying in 1000 "
497 schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
502 int svc_rdma_post_recv(struct svcxprt_rdma
*xprt
)
504 struct ib_recv_wr recv_wr
, *bad_recv_wr
;
505 struct svc_rdma_op_ctxt
*ctxt
;
512 ctxt
= svc_rdma_get_context(xprt
);
514 ctxt
->direction
= DMA_FROM_DEVICE
;
515 for (sge_no
= 0; buflen
< xprt
->sc_max_req_size
; sge_no
++) {
516 BUG_ON(sge_no
>= xprt
->sc_max_sge
);
517 page
= svc_rdma_get_page();
518 ctxt
->pages
[sge_no
] = page
;
519 pa
= ib_dma_map_page(xprt
->sc_cm_id
->device
,
522 ctxt
->sge
[sge_no
].addr
= pa
;
523 ctxt
->sge
[sge_no
].length
= PAGE_SIZE
;
524 ctxt
->sge
[sge_no
].lkey
= xprt
->sc_phys_mr
->lkey
;
527 ctxt
->count
= sge_no
;
529 recv_wr
.sg_list
= &ctxt
->sge
[0];
530 recv_wr
.num_sge
= ctxt
->count
;
531 recv_wr
.wr_id
= (u64
)(unsigned long)ctxt
;
533 ret
= ib_post_recv(xprt
->sc_qp
, &recv_wr
, &bad_recv_wr
);
535 svc_rdma_put_context(ctxt
, 1);
540 * This function handles the CONNECT_REQUEST event on a listening
541 * endpoint. It is passed the cma_id for the _new_ connection. The context in
542 * this cma_id is inherited from the listening cma_id and is the svc_xprt
543 * structure for the listening endpoint.
545 * This function creates a new xprt for the new connection and enqueues it on
546 * the accept queue for the listent xprt. When the listen thread is kicked, it
547 * will call the recvfrom method on the listen xprt which will accept the new
550 static void handle_connect_req(struct rdma_cm_id
*new_cma_id
)
552 struct svcxprt_rdma
*listen_xprt
= new_cma_id
->context
;
553 struct svcxprt_rdma
*newxprt
;
555 /* Create a new transport */
556 newxprt
= rdma_create_xprt(listen_xprt
->sc_xprt
.xpt_server
, 0);
558 dprintk("svcrdma: failed to create new transport\n");
561 newxprt
->sc_cm_id
= new_cma_id
;
562 new_cma_id
->context
= newxprt
;
563 dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
564 newxprt
, newxprt
->sc_cm_id
, listen_xprt
);
567 * Enqueue the new transport on the accept queue of the listening
570 spin_lock_bh(&listen_xprt
->sc_lock
);
571 list_add_tail(&newxprt
->sc_accept_q
, &listen_xprt
->sc_accept_q
);
572 spin_unlock_bh(&listen_xprt
->sc_lock
);
575 * Can't use svc_xprt_received here because we are not on a
578 set_bit(XPT_CONN
, &listen_xprt
->sc_xprt
.xpt_flags
);
579 svc_xprt_enqueue(&listen_xprt
->sc_xprt
);
583 * Handles events generated on the listening endpoint. These events will be
584 * either be incoming connect requests or adapter removal events.
586 static int rdma_listen_handler(struct rdma_cm_id
*cma_id
,
587 struct rdma_cm_event
*event
)
589 struct svcxprt_rdma
*xprt
= cma_id
->context
;
592 switch (event
->event
) {
593 case RDMA_CM_EVENT_CONNECT_REQUEST
:
594 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
595 "event=%d\n", cma_id
, cma_id
->context
, event
->event
);
596 handle_connect_req(cma_id
);
599 case RDMA_CM_EVENT_ESTABLISHED
:
600 /* Accept complete */
601 dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
602 "cm_id=%p\n", xprt
, cma_id
);
605 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
606 dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
609 set_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
);
613 dprintk("svcrdma: Unexpected event on listening endpoint %p, "
614 "event=%d\n", cma_id
, event
->event
);
621 static int rdma_cma_handler(struct rdma_cm_id
*cma_id
,
622 struct rdma_cm_event
*event
)
624 struct svc_xprt
*xprt
= cma_id
->context
;
625 struct svcxprt_rdma
*rdma
=
626 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
627 switch (event
->event
) {
628 case RDMA_CM_EVENT_ESTABLISHED
:
629 /* Accept complete */
631 dprintk("svcrdma: Connection completed on DTO xprt=%p, "
632 "cm_id=%p\n", xprt
, cma_id
);
633 clear_bit(RDMAXPRT_CONN_PENDING
, &rdma
->sc_flags
);
634 svc_xprt_enqueue(xprt
);
636 case RDMA_CM_EVENT_DISCONNECTED
:
637 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
640 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
641 svc_xprt_enqueue(xprt
);
645 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
646 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
647 "event=%d\n", cma_id
, xprt
, event
->event
);
649 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
650 svc_xprt_enqueue(xprt
);
654 dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
655 "event=%d\n", cma_id
, event
->event
);
662 * Create a listening RDMA service endpoint.
664 static struct svc_xprt
*svc_rdma_create(struct svc_serv
*serv
,
665 struct sockaddr
*sa
, int salen
,
668 struct rdma_cm_id
*listen_id
;
669 struct svcxprt_rdma
*cma_xprt
;
670 struct svc_xprt
*xprt
;
673 dprintk("svcrdma: Creating RDMA socket\n");
675 cma_xprt
= rdma_create_xprt(serv
, 1);
677 return ERR_PTR(-ENOMEM
);
678 xprt
= &cma_xprt
->sc_xprt
;
680 listen_id
= rdma_create_id(rdma_listen_handler
, cma_xprt
, RDMA_PS_TCP
);
681 if (IS_ERR(listen_id
)) {
682 ret
= PTR_ERR(listen_id
);
683 dprintk("svcrdma: rdma_create_id failed = %d\n", ret
);
687 ret
= rdma_bind_addr(listen_id
, sa
);
689 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret
);
692 cma_xprt
->sc_cm_id
= listen_id
;
694 ret
= rdma_listen(listen_id
, RPCRDMA_LISTEN_BACKLOG
);
696 dprintk("svcrdma: rdma_listen failed = %d\n", ret
);
701 * We need to use the address from the cm_id in case the
702 * caller specified 0 for the port number.
704 sa
= (struct sockaddr
*)&cma_xprt
->sc_cm_id
->route
.addr
.src_addr
;
705 svc_xprt_set_local(&cma_xprt
->sc_xprt
, sa
, salen
);
707 return &cma_xprt
->sc_xprt
;
710 rdma_destroy_id(listen_id
);
717 * This is the xpo_recvfrom function for listening endpoints. Its
718 * purpose is to accept incoming connections. The CMA callback handler
719 * has already created a new transport and attached it to the new CMA
722 * There is a queue of pending connections hung on the listening
723 * transport. This queue contains the new svc_xprt structure. This
724 * function takes svc_xprt structures off the accept_q and completes
727 static struct svc_xprt
*svc_rdma_accept(struct svc_xprt
*xprt
)
729 struct svcxprt_rdma
*listen_rdma
;
730 struct svcxprt_rdma
*newxprt
= NULL
;
731 struct rdma_conn_param conn_param
;
732 struct ib_qp_init_attr qp_attr
;
733 struct ib_device_attr devattr
;
738 listen_rdma
= container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
739 clear_bit(XPT_CONN
, &xprt
->xpt_flags
);
740 /* Get the next entry off the accept list */
741 spin_lock_bh(&listen_rdma
->sc_lock
);
742 if (!list_empty(&listen_rdma
->sc_accept_q
)) {
743 newxprt
= list_entry(listen_rdma
->sc_accept_q
.next
,
744 struct svcxprt_rdma
, sc_accept_q
);
745 list_del_init(&newxprt
->sc_accept_q
);
747 if (!list_empty(&listen_rdma
->sc_accept_q
))
748 set_bit(XPT_CONN
, &listen_rdma
->sc_xprt
.xpt_flags
);
749 spin_unlock_bh(&listen_rdma
->sc_lock
);
753 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
754 newxprt
, newxprt
->sc_cm_id
);
756 ret
= ib_query_device(newxprt
->sc_cm_id
->device
, &devattr
);
758 dprintk("svcrdma: could not query device attributes on "
759 "device %p, rc=%d\n", newxprt
->sc_cm_id
->device
, ret
);
763 /* Qualify the transport resource defaults with the
764 * capabilities of this particular device */
765 newxprt
->sc_max_sge
= min((size_t)devattr
.max_sge
,
766 (size_t)RPCSVC_MAXPAGES
);
767 newxprt
->sc_max_requests
= min((size_t)devattr
.max_qp_wr
,
768 (size_t)svcrdma_max_requests
);
769 newxprt
->sc_sq_depth
= RPCRDMA_SQ_DEPTH_MULT
* newxprt
->sc_max_requests
;
771 newxprt
->sc_ord
= min((size_t)devattr
.max_qp_rd_atom
,
772 (size_t)svcrdma_ord
);
774 newxprt
->sc_pd
= ib_alloc_pd(newxprt
->sc_cm_id
->device
);
775 if (IS_ERR(newxprt
->sc_pd
)) {
776 dprintk("svcrdma: error creating PD for connect request\n");
779 newxprt
->sc_sq_cq
= ib_create_cq(newxprt
->sc_cm_id
->device
,
783 newxprt
->sc_sq_depth
,
785 if (IS_ERR(newxprt
->sc_sq_cq
)) {
786 dprintk("svcrdma: error creating SQ CQ for connect request\n");
789 newxprt
->sc_rq_cq
= ib_create_cq(newxprt
->sc_cm_id
->device
,
793 newxprt
->sc_max_requests
,
795 if (IS_ERR(newxprt
->sc_rq_cq
)) {
796 dprintk("svcrdma: error creating RQ CQ for connect request\n");
800 memset(&qp_attr
, 0, sizeof qp_attr
);
801 qp_attr
.event_handler
= qp_event_handler
;
802 qp_attr
.qp_context
= &newxprt
->sc_xprt
;
803 qp_attr
.cap
.max_send_wr
= newxprt
->sc_sq_depth
;
804 qp_attr
.cap
.max_recv_wr
= newxprt
->sc_max_requests
;
805 qp_attr
.cap
.max_send_sge
= newxprt
->sc_max_sge
;
806 qp_attr
.cap
.max_recv_sge
= newxprt
->sc_max_sge
;
807 qp_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
808 qp_attr
.qp_type
= IB_QPT_RC
;
809 qp_attr
.send_cq
= newxprt
->sc_sq_cq
;
810 qp_attr
.recv_cq
= newxprt
->sc_rq_cq
;
811 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
812 " cm_id->device=%p, sc_pd->device=%p\n"
813 " cap.max_send_wr = %d\n"
814 " cap.max_recv_wr = %d\n"
815 " cap.max_send_sge = %d\n"
816 " cap.max_recv_sge = %d\n",
817 newxprt
->sc_cm_id
, newxprt
->sc_pd
,
818 newxprt
->sc_cm_id
->device
, newxprt
->sc_pd
->device
,
819 qp_attr
.cap
.max_send_wr
,
820 qp_attr
.cap
.max_recv_wr
,
821 qp_attr
.cap
.max_send_sge
,
822 qp_attr
.cap
.max_recv_sge
);
824 ret
= rdma_create_qp(newxprt
->sc_cm_id
, newxprt
->sc_pd
, &qp_attr
);
827 * XXX: This is a hack. We need a xx_request_qp interface
828 * that will adjust the qp_attr's with a best-effort
831 qp_attr
.cap
.max_send_sge
-= 2;
832 qp_attr
.cap
.max_recv_sge
-= 2;
833 ret
= rdma_create_qp(newxprt
->sc_cm_id
, newxprt
->sc_pd
,
836 dprintk("svcrdma: failed to create QP, ret=%d\n", ret
);
839 newxprt
->sc_max_sge
= qp_attr
.cap
.max_send_sge
;
840 newxprt
->sc_max_sge
= qp_attr
.cap
.max_recv_sge
;
841 newxprt
->sc_sq_depth
= qp_attr
.cap
.max_send_wr
;
842 newxprt
->sc_max_requests
= qp_attr
.cap
.max_recv_wr
;
844 svc_xprt_get(&newxprt
->sc_xprt
);
845 newxprt
->sc_qp
= newxprt
->sc_cm_id
->qp
;
847 /* Register all of physical memory */
848 newxprt
->sc_phys_mr
= ib_get_dma_mr(newxprt
->sc_pd
,
849 IB_ACCESS_LOCAL_WRITE
|
850 IB_ACCESS_REMOTE_WRITE
);
851 if (IS_ERR(newxprt
->sc_phys_mr
)) {
852 dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret
);
856 /* Post receive buffers */
857 for (i
= 0; i
< newxprt
->sc_max_requests
; i
++) {
858 ret
= svc_rdma_post_recv(newxprt
);
860 dprintk("svcrdma: failure posting receive buffers\n");
865 /* Swap out the handler */
866 newxprt
->sc_cm_id
->event_handler
= rdma_cma_handler
;
868 /* Accept Connection */
869 set_bit(RDMAXPRT_CONN_PENDING
, &newxprt
->sc_flags
);
870 memset(&conn_param
, 0, sizeof conn_param
);
871 conn_param
.responder_resources
= 0;
872 conn_param
.initiator_depth
= newxprt
->sc_ord
;
873 ret
= rdma_accept(newxprt
->sc_cm_id
, &conn_param
);
875 dprintk("svcrdma: failed to accept new connection, ret=%d\n",
880 dprintk("svcrdma: new connection %p accepted with the following "
882 " local_ip : %d.%d.%d.%d\n"
884 " remote_ip : %d.%d.%d.%d\n"
885 " remote_port : %d\n"
888 " max_requests : %d\n"
891 NIPQUAD(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
892 route
.addr
.src_addr
)->sin_addr
.s_addr
),
893 ntohs(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
894 route
.addr
.src_addr
)->sin_port
),
895 NIPQUAD(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
896 route
.addr
.dst_addr
)->sin_addr
.s_addr
),
897 ntohs(((struct sockaddr_in
*)&newxprt
->sc_cm_id
->
898 route
.addr
.dst_addr
)->sin_port
),
900 newxprt
->sc_sq_depth
,
901 newxprt
->sc_max_requests
,
904 /* Set the local and remote addresses in the transport */
905 sa
= (struct sockaddr
*)&newxprt
->sc_cm_id
->route
.addr
.dst_addr
;
906 svc_xprt_set_remote(&newxprt
->sc_xprt
, sa
, svc_addr_len(sa
));
907 sa
= (struct sockaddr
*)&newxprt
->sc_cm_id
->route
.addr
.src_addr
;
908 svc_xprt_set_local(&newxprt
->sc_xprt
, sa
, svc_addr_len(sa
));
910 ib_req_notify_cq(newxprt
->sc_sq_cq
, IB_CQ_NEXT_COMP
);
911 ib_req_notify_cq(newxprt
->sc_rq_cq
, IB_CQ_NEXT_COMP
);
912 return &newxprt
->sc_xprt
;
915 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret
);
916 /* Take a reference in case the DTO handler runs */
917 svc_xprt_get(&newxprt
->sc_xprt
);
918 if (newxprt
->sc_qp
&& !IS_ERR(newxprt
->sc_qp
)) {
919 ib_destroy_qp(newxprt
->sc_qp
);
920 svc_xprt_put(&newxprt
->sc_xprt
);
922 rdma_destroy_id(newxprt
->sc_cm_id
);
923 /* This call to put will destroy the transport */
924 svc_xprt_put(&newxprt
->sc_xprt
);
928 static void svc_rdma_release_rqst(struct svc_rqst
*rqstp
)
933 * When connected, an svc_xprt has at least three references:
935 * - A reference held by the QP. We still hold that here because this
936 * code deletes the QP and puts the reference.
938 * - A reference held by the cm_id between the ESTABLISHED and
939 * DISCONNECTED events. If the remote peer disconnected first, this
940 * reference could be gone.
942 * - A reference held by the svc_recv code that called this function
943 * as part of close processing.
945 * At a minimum two references should still be held.
947 static void svc_rdma_detach(struct svc_xprt
*xprt
)
949 struct svcxprt_rdma
*rdma
=
950 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
951 dprintk("svc: svc_rdma_detach(%p)\n", xprt
);
953 /* Disconnect and flush posted WQE */
954 rdma_disconnect(rdma
->sc_cm_id
);
956 /* Destroy the QP if present (not a listener) */
957 if (rdma
->sc_qp
&& !IS_ERR(rdma
->sc_qp
)) {
958 ib_destroy_qp(rdma
->sc_qp
);
962 /* Destroy the CM ID */
963 rdma_destroy_id(rdma
->sc_cm_id
);
966 static void svc_rdma_free(struct svc_xprt
*xprt
)
968 struct svcxprt_rdma
*rdma
= (struct svcxprt_rdma
*)xprt
;
969 dprintk("svcrdma: svc_rdma_free(%p)\n", rdma
);
970 /* We should only be called from kref_put */
971 BUG_ON(atomic_read(&xprt
->xpt_ref
.refcount
) != 0);
972 if (rdma
->sc_sq_cq
&& !IS_ERR(rdma
->sc_sq_cq
))
973 ib_destroy_cq(rdma
->sc_sq_cq
);
975 if (rdma
->sc_rq_cq
&& !IS_ERR(rdma
->sc_rq_cq
))
976 ib_destroy_cq(rdma
->sc_rq_cq
);
978 if (rdma
->sc_phys_mr
&& !IS_ERR(rdma
->sc_phys_mr
))
979 ib_dereg_mr(rdma
->sc_phys_mr
);
981 if (rdma
->sc_pd
&& !IS_ERR(rdma
->sc_pd
))
982 ib_dealloc_pd(rdma
->sc_pd
);
984 destroy_context_cache(rdma
);
988 static int svc_rdma_has_wspace(struct svc_xprt
*xprt
)
990 struct svcxprt_rdma
*rdma
=
991 container_of(xprt
, struct svcxprt_rdma
, sc_xprt
);
994 * If there are fewer SQ WR available than required to send a
995 * simple response, return false.
997 if ((rdma
->sc_sq_depth
- atomic_read(&rdma
->sc_sq_count
) < 3))
1001 * ...or there are already waiters on the SQ,
1004 if (waitqueue_active(&rdma
->sc_send_wait
))
1007 /* Otherwise return true. */
1011 int svc_rdma_send(struct svcxprt_rdma
*xprt
, struct ib_send_wr
*wr
)
1013 struct ib_send_wr
*bad_wr
;
1016 if (test_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
))
1019 BUG_ON(wr
->send_flags
!= IB_SEND_SIGNALED
);
1020 BUG_ON(((struct svc_rdma_op_ctxt
*)(unsigned long)wr
->wr_id
)->wr_op
!=
1022 /* If the SQ is full, wait until an SQ entry is available */
1024 spin_lock_bh(&xprt
->sc_lock
);
1025 if (xprt
->sc_sq_depth
== atomic_read(&xprt
->sc_sq_count
)) {
1026 spin_unlock_bh(&xprt
->sc_lock
);
1027 atomic_inc(&rdma_stat_sq_starve
);
1029 /* See if we can opportunistically reap SQ WR to make room */
1032 /* Wait until SQ WR available if SQ still full */
1033 wait_event(xprt
->sc_send_wait
,
1034 atomic_read(&xprt
->sc_sq_count
) <
1036 if (test_bit(XPT_CLOSE
, &xprt
->sc_xprt
.xpt_flags
))
1040 /* Bumped used SQ WR count and post */
1041 ret
= ib_post_send(xprt
->sc_qp
, wr
, &bad_wr
);
1043 atomic_inc(&xprt
->sc_sq_count
);
1045 dprintk("svcrdma: failed to post SQ WR rc=%d, "
1046 "sc_sq_count=%d, sc_sq_depth=%d\n",
1047 ret
, atomic_read(&xprt
->sc_sq_count
),
1049 spin_unlock_bh(&xprt
->sc_lock
);
1055 int svc_rdma_send_error(struct svcxprt_rdma
*xprt
, struct rpcrdma_msg
*rmsgp
,
1056 enum rpcrdma_errcode err
)
1058 struct ib_send_wr err_wr
;
1061 struct svc_rdma_op_ctxt
*ctxt
;
1066 p
= svc_rdma_get_page();
1067 va
= page_address(p
);
1069 /* XDR encode error */
1070 length
= svc_rdma_xdr_encode_error(xprt
, rmsgp
, err
, va
);
1072 /* Prepare SGE for local address */
1073 sge
.addr
= ib_dma_map_page(xprt
->sc_cm_id
->device
,
1074 p
, 0, PAGE_SIZE
, DMA_FROM_DEVICE
);
1075 sge
.lkey
= xprt
->sc_phys_mr
->lkey
;
1076 sge
.length
= length
;
1078 ctxt
= svc_rdma_get_context(xprt
);
1082 /* Prepare SEND WR */
1083 memset(&err_wr
, 0, sizeof err_wr
);
1084 ctxt
->wr_op
= IB_WR_SEND
;
1085 err_wr
.wr_id
= (unsigned long)ctxt
;
1086 err_wr
.sg_list
= &sge
;
1088 err_wr
.opcode
= IB_WR_SEND
;
1089 err_wr
.send_flags
= IB_SEND_SIGNALED
;
1092 ret
= svc_rdma_send(xprt
, &err_wr
);
1094 dprintk("svcrdma: Error posting send = %d\n", ret
);
1095 svc_rdma_put_context(ctxt
, 1);