2 * Copyright (c) 2003-2007 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.
43 * Encapsulates the major functions managing:
50 #include <linux/interrupt.h>
51 #include <linux/slab.h>
52 #include <linux/prefetch.h>
53 #include <linux/sunrpc/addr.h>
54 #include <asm/bitops.h>
55 #include <linux/module.h> /* try_module_get()/module_put() */
57 #include "xprt_rdma.h"
63 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
64 # define RPCDBG_FACILITY RPCDBG_TRANS
71 static struct workqueue_struct
*rpcrdma_receive_wq
;
74 rpcrdma_alloc_wq(void)
76 struct workqueue_struct
*recv_wq
;
78 recv_wq
= alloc_workqueue("xprtrdma_receive",
79 WQ_MEM_RECLAIM
| WQ_UNBOUND
| WQ_HIGHPRI
,
84 rpcrdma_receive_wq
= recv_wq
;
89 rpcrdma_destroy_wq(void)
91 struct workqueue_struct
*wq
;
93 if (rpcrdma_receive_wq
) {
94 wq
= rpcrdma_receive_wq
;
95 rpcrdma_receive_wq
= NULL
;
96 destroy_workqueue(wq
);
101 rpcrdma_qp_async_error_upcall(struct ib_event
*event
, void *context
)
103 struct rpcrdma_ep
*ep
= context
;
105 pr_err("RPC: %s: %s on device %s ep %p\n",
106 __func__
, ib_event_msg(event
->event
),
107 event
->device
->name
, context
);
108 if (ep
->rep_connected
== 1) {
109 ep
->rep_connected
= -EIO
;
110 rpcrdma_conn_func(ep
);
111 wake_up_all(&ep
->rep_connect_wait
);
116 rpcrdma_cq_async_error_upcall(struct ib_event
*event
, void *context
)
118 struct rpcrdma_ep
*ep
= context
;
120 pr_err("RPC: %s: %s on device %s ep %p\n",
121 __func__
, ib_event_msg(event
->event
),
122 event
->device
->name
, context
);
123 if (ep
->rep_connected
== 1) {
124 ep
->rep_connected
= -EIO
;
125 rpcrdma_conn_func(ep
);
126 wake_up_all(&ep
->rep_connect_wait
);
131 rpcrdma_sendcq_process_wc(struct ib_wc
*wc
)
133 /* WARNING: Only wr_id and status are reliable at this point */
134 if (wc
->wr_id
== RPCRDMA_IGNORE_COMPLETION
) {
135 if (wc
->status
!= IB_WC_SUCCESS
&&
136 wc
->status
!= IB_WC_WR_FLUSH_ERR
)
137 pr_err("RPC: %s: SEND: %s\n",
138 __func__
, ib_wc_status_msg(wc
->status
));
140 struct rpcrdma_mw
*r
;
142 r
= (struct rpcrdma_mw
*)(unsigned long)wc
->wr_id
;
143 r
->mw_sendcompletion(wc
);
147 /* The common case is a single send completion is waiting. By
148 * passing two WC entries to ib_poll_cq, a return code of 1
149 * means there is exactly one WC waiting and no more. We don't
150 * have to invoke ib_poll_cq again to know that the CQ has been
154 rpcrdma_sendcq_poll(struct ib_cq
*cq
)
156 struct ib_wc
*pos
, wcs
[2];
162 rc
= ib_poll_cq(cq
, ARRAY_SIZE(wcs
), pos
);
168 rpcrdma_sendcq_process_wc(pos
++);
169 } while (rc
== ARRAY_SIZE(wcs
));
173 /* Handle provider send completion upcalls.
176 rpcrdma_sendcq_upcall(struct ib_cq
*cq
, void *cq_context
)
179 rpcrdma_sendcq_poll(cq
);
180 } while (ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
|
181 IB_CQ_REPORT_MISSED_EVENTS
) > 0);
185 rpcrdma_receive_worker(struct work_struct
*work
)
187 struct rpcrdma_rep
*rep
=
188 container_of(work
, struct rpcrdma_rep
, rr_work
);
190 rpcrdma_reply_handler(rep
);
194 rpcrdma_recvcq_process_wc(struct ib_wc
*wc
)
196 struct rpcrdma_rep
*rep
=
197 (struct rpcrdma_rep
*)(unsigned long)wc
->wr_id
;
199 /* WARNING: Only wr_id and status are reliable at this point */
200 if (wc
->status
!= IB_WC_SUCCESS
)
203 /* status == SUCCESS means all fields in wc are trustworthy */
204 if (wc
->opcode
!= IB_WC_RECV
)
207 dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
208 __func__
, rep
, wc
->byte_len
);
210 rep
->rr_len
= wc
->byte_len
;
211 ib_dma_sync_single_for_cpu(rep
->rr_device
,
212 rdmab_addr(rep
->rr_rdmabuf
),
213 rep
->rr_len
, DMA_FROM_DEVICE
);
214 prefetch(rdmab_to_msg(rep
->rr_rdmabuf
));
217 queue_work(rpcrdma_receive_wq
, &rep
->rr_work
);
221 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
222 pr_err("RPC: %s: rep %p: %s\n",
223 __func__
, rep
, ib_wc_status_msg(wc
->status
));
224 rep
->rr_len
= RPCRDMA_BAD_LEN
;
228 /* The wc array is on stack: automatic memory is always CPU-local.
230 * struct ib_wc is 64 bytes, making the poll array potentially
231 * large. But this is at the bottom of the call chain. Further
232 * substantial work is done in another thread.
235 rpcrdma_recvcq_poll(struct ib_cq
*cq
)
237 struct ib_wc
*pos
, wcs
[4];
243 rc
= ib_poll_cq(cq
, ARRAY_SIZE(wcs
), pos
);
249 rpcrdma_recvcq_process_wc(pos
++);
250 } while (rc
== ARRAY_SIZE(wcs
));
253 /* Handle provider receive completion upcalls.
256 rpcrdma_recvcq_upcall(struct ib_cq
*cq
, void *cq_context
)
259 rpcrdma_recvcq_poll(cq
);
260 } while (ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
|
261 IB_CQ_REPORT_MISSED_EVENTS
) > 0);
265 rpcrdma_flush_cqs(struct rpcrdma_ep
*ep
)
269 while (ib_poll_cq(ep
->rep_attr
.recv_cq
, 1, &wc
) > 0)
270 rpcrdma_recvcq_process_wc(&wc
);
271 while (ib_poll_cq(ep
->rep_attr
.send_cq
, 1, &wc
) > 0)
272 rpcrdma_sendcq_process_wc(&wc
);
276 rpcrdma_conn_upcall(struct rdma_cm_id
*id
, struct rdma_cm_event
*event
)
278 struct rpcrdma_xprt
*xprt
= id
->context
;
279 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
280 struct rpcrdma_ep
*ep
= &xprt
->rx_ep
;
281 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
282 struct sockaddr
*sap
= (struct sockaddr
*)&ep
->rep_remote_addr
;
284 struct ib_qp_attr
*attr
= &ia
->ri_qp_attr
;
285 struct ib_qp_init_attr
*iattr
= &ia
->ri_qp_init_attr
;
288 switch (event
->event
) {
289 case RDMA_CM_EVENT_ADDR_RESOLVED
:
290 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
292 complete(&ia
->ri_done
);
294 case RDMA_CM_EVENT_ADDR_ERROR
:
295 ia
->ri_async_rc
= -EHOSTUNREACH
;
296 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
298 complete(&ia
->ri_done
);
300 case RDMA_CM_EVENT_ROUTE_ERROR
:
301 ia
->ri_async_rc
= -ENETUNREACH
;
302 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
304 complete(&ia
->ri_done
);
306 case RDMA_CM_EVENT_ESTABLISHED
:
308 ib_query_qp(ia
->ri_id
->qp
, attr
,
309 IB_QP_MAX_QP_RD_ATOMIC
| IB_QP_MAX_DEST_RD_ATOMIC
,
311 dprintk("RPC: %s: %d responder resources"
313 __func__
, attr
->max_dest_rd_atomic
,
314 attr
->max_rd_atomic
);
316 case RDMA_CM_EVENT_CONNECT_ERROR
:
317 connstate
= -ENOTCONN
;
319 case RDMA_CM_EVENT_UNREACHABLE
:
320 connstate
= -ENETDOWN
;
322 case RDMA_CM_EVENT_REJECTED
:
323 connstate
= -ECONNREFUSED
;
325 case RDMA_CM_EVENT_DISCONNECTED
:
326 connstate
= -ECONNABORTED
;
328 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
331 dprintk("RPC: %s: %sconnected\n",
332 __func__
, connstate
> 0 ? "" : "dis");
333 ep
->rep_connected
= connstate
;
334 rpcrdma_conn_func(ep
);
335 wake_up_all(&ep
->rep_connect_wait
);
338 dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
339 __func__
, sap
, rpc_get_port(sap
), ep
,
340 rdma_event_msg(event
->event
));
344 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
345 if (connstate
== 1) {
346 int ird
= attr
->max_dest_rd_atomic
;
347 int tird
= ep
->rep_remote_cma
.responder_resources
;
349 pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
350 sap
, rpc_get_port(sap
),
352 ia
->ri_ops
->ro_displayname
,
353 xprt
->rx_buf
.rb_max_requests
,
354 ird
, ird
< 4 && ird
< tird
/ 2 ? " (low!)" : "");
355 } else if (connstate
< 0) {
356 pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
357 sap
, rpc_get_port(sap
), connstate
);
364 static void rpcrdma_destroy_id(struct rdma_cm_id
*id
)
367 module_put(id
->device
->owner
);
372 static struct rdma_cm_id
*
373 rpcrdma_create_id(struct rpcrdma_xprt
*xprt
,
374 struct rpcrdma_ia
*ia
, struct sockaddr
*addr
)
376 struct rdma_cm_id
*id
;
379 init_completion(&ia
->ri_done
);
381 id
= rdma_create_id(&init_net
, rpcrdma_conn_upcall
, xprt
, RDMA_PS_TCP
,
385 dprintk("RPC: %s: rdma_create_id() failed %i\n",
390 ia
->ri_async_rc
= -ETIMEDOUT
;
391 rc
= rdma_resolve_addr(id
, NULL
, addr
, RDMA_RESOLVE_TIMEOUT
);
393 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
397 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
398 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
401 * Until xprtrdma supports DEVICE_REMOVAL, the provider must
402 * be pinned while there are active NFS/RDMA mounts to prevent
403 * hangs and crashes at umount time.
405 if (!ia
->ri_async_rc
&& !try_module_get(id
->device
->owner
)) {
406 dprintk("RPC: %s: Failed to get device module\n",
408 ia
->ri_async_rc
= -ENODEV
;
410 rc
= ia
->ri_async_rc
;
414 ia
->ri_async_rc
= -ETIMEDOUT
;
415 rc
= rdma_resolve_route(id
, RDMA_RESOLVE_TIMEOUT
);
417 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
421 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
422 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
423 rc
= ia
->ri_async_rc
;
429 module_put(id
->device
->owner
);
436 * Drain any cq, prior to teardown.
439 rpcrdma_clean_cq(struct ib_cq
*cq
)
444 while (1 == ib_poll_cq(cq
, 1, &wc
))
448 dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
449 __func__
, count
, wc
.opcode
);
453 * Exported functions.
457 * Open and initialize an Interface Adapter.
458 * o initializes fields of struct rpcrdma_ia, including
459 * interface and provider attributes and protection zone.
462 rpcrdma_ia_open(struct rpcrdma_xprt
*xprt
, struct sockaddr
*addr
, int memreg
)
464 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
467 ia
->ri_dma_mr
= NULL
;
469 ia
->ri_id
= rpcrdma_create_id(xprt
, ia
, addr
);
470 if (IS_ERR(ia
->ri_id
)) {
471 rc
= PTR_ERR(ia
->ri_id
);
474 ia
->ri_device
= ia
->ri_id
->device
;
476 ia
->ri_pd
= ib_alloc_pd(ia
->ri_device
);
477 if (IS_ERR(ia
->ri_pd
)) {
478 rc
= PTR_ERR(ia
->ri_pd
);
479 dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
484 if (memreg
== RPCRDMA_FRMR
) {
485 if (!(ia
->ri_device
->attrs
.device_cap_flags
&
486 IB_DEVICE_MEM_MGT_EXTENSIONS
) ||
487 (ia
->ri_device
->attrs
.max_fast_reg_page_list_len
== 0)) {
488 dprintk("RPC: %s: FRMR registration "
489 "not supported by HCA\n", __func__
);
490 memreg
= RPCRDMA_MTHCAFMR
;
493 if (memreg
== RPCRDMA_MTHCAFMR
) {
494 if (!ia
->ri_device
->alloc_fmr
) {
495 dprintk("RPC: %s: MTHCAFMR registration "
496 "not supported by HCA\n", __func__
);
504 ia
->ri_ops
= &rpcrdma_frwr_memreg_ops
;
506 case RPCRDMA_ALLPHYSICAL
:
507 ia
->ri_ops
= &rpcrdma_physical_memreg_ops
;
509 case RPCRDMA_MTHCAFMR
:
510 ia
->ri_ops
= &rpcrdma_fmr_memreg_ops
;
513 printk(KERN_ERR
"RPC: Unsupported memory "
514 "registration mode: %d\n", memreg
);
518 dprintk("RPC: %s: memory registration strategy is '%s'\n",
519 __func__
, ia
->ri_ops
->ro_displayname
);
521 rwlock_init(&ia
->ri_qplock
);
525 ib_dealloc_pd(ia
->ri_pd
);
528 rpcrdma_destroy_id(ia
->ri_id
);
535 * Clean up/close an IA.
536 * o if event handles and PD have been initialized, free them.
540 rpcrdma_ia_close(struct rpcrdma_ia
*ia
)
542 dprintk("RPC: %s: entering\n", __func__
);
543 if (ia
->ri_id
!= NULL
&& !IS_ERR(ia
->ri_id
)) {
545 rdma_destroy_qp(ia
->ri_id
);
546 rpcrdma_destroy_id(ia
->ri_id
);
550 /* If the pd is still busy, xprtrdma missed freeing a resource */
551 if (ia
->ri_pd
&& !IS_ERR(ia
->ri_pd
))
552 ib_dealloc_pd(ia
->ri_pd
);
556 * Create unconnected endpoint.
559 rpcrdma_ep_create(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
,
560 struct rpcrdma_create_data_internal
*cdata
)
562 struct ib_cq
*sendcq
, *recvcq
;
563 struct ib_cq_init_attr cq_attr
= {};
564 unsigned int max_qp_wr
;
567 if (ia
->ri_device
->attrs
.max_sge
< RPCRDMA_MAX_IOVS
) {
568 dprintk("RPC: %s: insufficient sge's available\n",
573 if (ia
->ri_device
->attrs
.max_qp_wr
<= RPCRDMA_BACKWARD_WRS
) {
574 dprintk("RPC: %s: insufficient wqe's available\n",
578 max_qp_wr
= ia
->ri_device
->attrs
.max_qp_wr
- RPCRDMA_BACKWARD_WRS
;
580 /* check provider's send/recv wr limits */
581 if (cdata
->max_requests
> max_qp_wr
)
582 cdata
->max_requests
= max_qp_wr
;
584 ep
->rep_attr
.event_handler
= rpcrdma_qp_async_error_upcall
;
585 ep
->rep_attr
.qp_context
= ep
;
586 ep
->rep_attr
.srq
= NULL
;
587 ep
->rep_attr
.cap
.max_send_wr
= cdata
->max_requests
;
588 ep
->rep_attr
.cap
.max_send_wr
+= RPCRDMA_BACKWARD_WRS
;
589 rc
= ia
->ri_ops
->ro_open(ia
, ep
, cdata
);
592 ep
->rep_attr
.cap
.max_recv_wr
= cdata
->max_requests
;
593 ep
->rep_attr
.cap
.max_recv_wr
+= RPCRDMA_BACKWARD_WRS
;
594 ep
->rep_attr
.cap
.max_send_sge
= RPCRDMA_MAX_IOVS
;
595 ep
->rep_attr
.cap
.max_recv_sge
= 1;
596 ep
->rep_attr
.cap
.max_inline_data
= 0;
597 ep
->rep_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
598 ep
->rep_attr
.qp_type
= IB_QPT_RC
;
599 ep
->rep_attr
.port_num
= ~0;
601 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
602 "iovs: send %d recv %d\n",
604 ep
->rep_attr
.cap
.max_send_wr
,
605 ep
->rep_attr
.cap
.max_recv_wr
,
606 ep
->rep_attr
.cap
.max_send_sge
,
607 ep
->rep_attr
.cap
.max_recv_sge
);
609 /* set trigger for requesting send completion */
610 ep
->rep_cqinit
= ep
->rep_attr
.cap
.max_send_wr
/2 - 1;
611 if (ep
->rep_cqinit
<= 2)
612 ep
->rep_cqinit
= 0; /* always signal? */
614 init_waitqueue_head(&ep
->rep_connect_wait
);
615 INIT_DELAYED_WORK(&ep
->rep_connect_worker
, rpcrdma_connect_worker
);
617 cq_attr
.cqe
= ep
->rep_attr
.cap
.max_send_wr
+ 1;
618 sendcq
= ib_create_cq(ia
->ri_device
, rpcrdma_sendcq_upcall
,
619 rpcrdma_cq_async_error_upcall
, NULL
, &cq_attr
);
620 if (IS_ERR(sendcq
)) {
621 rc
= PTR_ERR(sendcq
);
622 dprintk("RPC: %s: failed to create send CQ: %i\n",
627 rc
= ib_req_notify_cq(sendcq
, IB_CQ_NEXT_COMP
);
629 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
634 cq_attr
.cqe
= ep
->rep_attr
.cap
.max_recv_wr
+ 1;
635 recvcq
= ib_create_cq(ia
->ri_device
, rpcrdma_recvcq_upcall
,
636 rpcrdma_cq_async_error_upcall
, NULL
, &cq_attr
);
637 if (IS_ERR(recvcq
)) {
638 rc
= PTR_ERR(recvcq
);
639 dprintk("RPC: %s: failed to create recv CQ: %i\n",
644 rc
= ib_req_notify_cq(recvcq
, IB_CQ_NEXT_COMP
);
646 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
648 ib_destroy_cq(recvcq
);
652 ep
->rep_attr
.send_cq
= sendcq
;
653 ep
->rep_attr
.recv_cq
= recvcq
;
655 /* Initialize cma parameters */
657 /* RPC/RDMA does not use private data */
658 ep
->rep_remote_cma
.private_data
= NULL
;
659 ep
->rep_remote_cma
.private_data_len
= 0;
661 /* Client offers RDMA Read but does not initiate */
662 ep
->rep_remote_cma
.initiator_depth
= 0;
663 if (ia
->ri_device
->attrs
.max_qp_rd_atom
> 32) /* arbitrary but <= 255 */
664 ep
->rep_remote_cma
.responder_resources
= 32;
666 ep
->rep_remote_cma
.responder_resources
=
667 ia
->ri_device
->attrs
.max_qp_rd_atom
;
669 ep
->rep_remote_cma
.retry_count
= 7;
670 ep
->rep_remote_cma
.flow_control
= 0;
671 ep
->rep_remote_cma
.rnr_retry_count
= 0;
676 err
= ib_destroy_cq(sendcq
);
678 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
682 ib_dereg_mr(ia
->ri_dma_mr
);
689 * Disconnect and destroy endpoint. After this, the only
690 * valid operations on the ep are to free it (if dynamically
691 * allocated) or re-create it.
694 rpcrdma_ep_destroy(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
698 dprintk("RPC: %s: entering, connected is %d\n",
699 __func__
, ep
->rep_connected
);
701 cancel_delayed_work_sync(&ep
->rep_connect_worker
);
704 rpcrdma_ep_disconnect(ep
, ia
);
706 rpcrdma_clean_cq(ep
->rep_attr
.recv_cq
);
707 rpcrdma_clean_cq(ep
->rep_attr
.send_cq
);
710 rdma_destroy_qp(ia
->ri_id
);
711 ia
->ri_id
->qp
= NULL
;
714 rc
= ib_destroy_cq(ep
->rep_attr
.recv_cq
);
716 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
719 rc
= ib_destroy_cq(ep
->rep_attr
.send_cq
);
721 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
725 rc
= ib_dereg_mr(ia
->ri_dma_mr
);
726 dprintk("RPC: %s: ib_dereg_mr returned %i\n",
732 * Connect unconnected endpoint.
735 rpcrdma_ep_connect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
737 struct rdma_cm_id
*id
, *old
;
741 if (ep
->rep_connected
!= 0) {
742 struct rpcrdma_xprt
*xprt
;
744 dprintk("RPC: %s: reconnecting...\n", __func__
);
746 rpcrdma_ep_disconnect(ep
, ia
);
747 rpcrdma_flush_cqs(ep
);
749 xprt
= container_of(ia
, struct rpcrdma_xprt
, rx_ia
);
750 id
= rpcrdma_create_id(xprt
, ia
,
751 (struct sockaddr
*)&xprt
->rx_data
.addr
);
756 /* TEMP TEMP TEMP - fail if new device:
757 * Deregister/remarshal *all* requests!
758 * Close and recreate adapter, pd, etc!
759 * Re-determine all attributes still sane!
760 * More stuff I haven't thought of!
763 if (ia
->ri_device
!= id
->device
) {
764 printk("RPC: %s: can't reconnect on "
765 "different device!\n", __func__
);
766 rpcrdma_destroy_id(id
);
771 rc
= rdma_create_qp(id
, ia
->ri_pd
, &ep
->rep_attr
);
773 dprintk("RPC: %s: rdma_create_qp failed %i\n",
775 rpcrdma_destroy_id(id
);
780 write_lock(&ia
->ri_qplock
);
783 write_unlock(&ia
->ri_qplock
);
785 rdma_destroy_qp(old
);
786 rpcrdma_destroy_id(old
);
788 dprintk("RPC: %s: connecting...\n", __func__
);
789 rc
= rdma_create_qp(ia
->ri_id
, ia
->ri_pd
, &ep
->rep_attr
);
791 dprintk("RPC: %s: rdma_create_qp failed %i\n",
793 /* do not update ep->rep_connected */
798 ep
->rep_connected
= 0;
800 rc
= rdma_connect(ia
->ri_id
, &ep
->rep_remote_cma
);
802 dprintk("RPC: %s: rdma_connect() failed with %i\n",
807 wait_event_interruptible(ep
->rep_connect_wait
, ep
->rep_connected
!= 0);
810 * Check state. A non-peer reject indicates no listener
811 * (ECONNREFUSED), which may be a transient state. All
812 * others indicate a transport condition which has already
813 * undergone a best-effort.
815 if (ep
->rep_connected
== -ECONNREFUSED
&&
816 ++retry_count
<= RDMA_CONNECT_RETRY_MAX
) {
817 dprintk("RPC: %s: non-peer_reject, retry\n", __func__
);
820 if (ep
->rep_connected
<= 0) {
821 /* Sometimes, the only way to reliably connect to remote
822 * CMs is to use same nonzero values for ORD and IRD. */
823 if (retry_count
++ <= RDMA_CONNECT_RETRY_MAX
+ 1 &&
824 (ep
->rep_remote_cma
.responder_resources
== 0 ||
825 ep
->rep_remote_cma
.initiator_depth
!=
826 ep
->rep_remote_cma
.responder_resources
)) {
827 if (ep
->rep_remote_cma
.responder_resources
== 0)
828 ep
->rep_remote_cma
.responder_resources
= 1;
829 ep
->rep_remote_cma
.initiator_depth
=
830 ep
->rep_remote_cma
.responder_resources
;
833 rc
= ep
->rep_connected
;
835 struct rpcrdma_xprt
*r_xprt
;
838 dprintk("RPC: %s: connected\n", __func__
);
840 r_xprt
= container_of(ia
, struct rpcrdma_xprt
, rx_ia
);
841 extras
= r_xprt
->rx_buf
.rb_bc_srv_max_requests
;
844 rc
= rpcrdma_ep_post_extra_recv(r_xprt
, extras
);
846 pr_warn("%s: rpcrdma_ep_post_extra_recv: %i\n",
855 ep
->rep_connected
= rc
;
860 * rpcrdma_ep_disconnect
862 * This is separate from destroy to facilitate the ability
863 * to reconnect without recreating the endpoint.
865 * This call is not reentrant, and must not be made in parallel
866 * on the same endpoint.
869 rpcrdma_ep_disconnect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
873 rpcrdma_flush_cqs(ep
);
874 rc
= rdma_disconnect(ia
->ri_id
);
876 /* returns without wait if not connected */
877 wait_event_interruptible(ep
->rep_connect_wait
,
878 ep
->rep_connected
!= 1);
879 dprintk("RPC: %s: after wait, %sconnected\n", __func__
,
880 (ep
->rep_connected
== 1) ? "still " : "dis");
882 dprintk("RPC: %s: rdma_disconnect %i\n", __func__
, rc
);
883 ep
->rep_connected
= rc
;
888 rpcrdma_create_req(struct rpcrdma_xprt
*r_xprt
)
890 struct rpcrdma_buffer
*buffer
= &r_xprt
->rx_buf
;
891 struct rpcrdma_req
*req
;
893 req
= kzalloc(sizeof(*req
), GFP_KERNEL
);
895 return ERR_PTR(-ENOMEM
);
897 INIT_LIST_HEAD(&req
->rl_free
);
898 spin_lock(&buffer
->rb_reqslock
);
899 list_add(&req
->rl_all
, &buffer
->rb_allreqs
);
900 spin_unlock(&buffer
->rb_reqslock
);
901 req
->rl_buffer
= &r_xprt
->rx_buf
;
906 rpcrdma_create_rep(struct rpcrdma_xprt
*r_xprt
)
908 struct rpcrdma_create_data_internal
*cdata
= &r_xprt
->rx_data
;
909 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
910 struct rpcrdma_rep
*rep
;
914 rep
= kzalloc(sizeof(*rep
), GFP_KERNEL
);
918 rep
->rr_rdmabuf
= rpcrdma_alloc_regbuf(ia
, cdata
->inline_rsize
,
920 if (IS_ERR(rep
->rr_rdmabuf
)) {
921 rc
= PTR_ERR(rep
->rr_rdmabuf
);
925 rep
->rr_device
= ia
->ri_device
;
926 rep
->rr_rxprt
= r_xprt
;
927 INIT_WORK(&rep
->rr_work
, rpcrdma_receive_worker
);
937 rpcrdma_buffer_create(struct rpcrdma_xprt
*r_xprt
)
939 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
940 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
943 buf
->rb_max_requests
= r_xprt
->rx_data
.max_requests
;
944 buf
->rb_bc_srv_max_requests
= 0;
945 spin_lock_init(&buf
->rb_lock
);
947 rc
= ia
->ri_ops
->ro_init(r_xprt
);
951 INIT_LIST_HEAD(&buf
->rb_send_bufs
);
952 INIT_LIST_HEAD(&buf
->rb_allreqs
);
953 spin_lock_init(&buf
->rb_reqslock
);
954 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
955 struct rpcrdma_req
*req
;
957 req
= rpcrdma_create_req(r_xprt
);
959 dprintk("RPC: %s: request buffer %d alloc"
960 " failed\n", __func__
, i
);
964 req
->rl_backchannel
= false;
965 list_add(&req
->rl_free
, &buf
->rb_send_bufs
);
968 INIT_LIST_HEAD(&buf
->rb_recv_bufs
);
969 for (i
= 0; i
< buf
->rb_max_requests
+ 2; i
++) {
970 struct rpcrdma_rep
*rep
;
972 rep
= rpcrdma_create_rep(r_xprt
);
974 dprintk("RPC: %s: reply buffer %d alloc failed\n",
979 list_add(&rep
->rr_list
, &buf
->rb_recv_bufs
);
984 rpcrdma_buffer_destroy(buf
);
988 static struct rpcrdma_req
*
989 rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer
*buf
)
991 struct rpcrdma_req
*req
;
993 req
= list_first_entry(&buf
->rb_send_bufs
,
994 struct rpcrdma_req
, rl_free
);
995 list_del(&req
->rl_free
);
999 static struct rpcrdma_rep
*
1000 rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer
*buf
)
1002 struct rpcrdma_rep
*rep
;
1004 rep
= list_first_entry(&buf
->rb_recv_bufs
,
1005 struct rpcrdma_rep
, rr_list
);
1006 list_del(&rep
->rr_list
);
1011 rpcrdma_destroy_rep(struct rpcrdma_ia
*ia
, struct rpcrdma_rep
*rep
)
1013 rpcrdma_free_regbuf(ia
, rep
->rr_rdmabuf
);
1018 rpcrdma_destroy_req(struct rpcrdma_ia
*ia
, struct rpcrdma_req
*req
)
1020 rpcrdma_free_regbuf(ia
, req
->rl_sendbuf
);
1021 rpcrdma_free_regbuf(ia
, req
->rl_rdmabuf
);
1026 rpcrdma_buffer_destroy(struct rpcrdma_buffer
*buf
)
1028 struct rpcrdma_ia
*ia
= rdmab_to_ia(buf
);
1030 while (!list_empty(&buf
->rb_recv_bufs
)) {
1031 struct rpcrdma_rep
*rep
;
1033 rep
= rpcrdma_buffer_get_rep_locked(buf
);
1034 rpcrdma_destroy_rep(ia
, rep
);
1037 spin_lock(&buf
->rb_reqslock
);
1038 while (!list_empty(&buf
->rb_allreqs
)) {
1039 struct rpcrdma_req
*req
;
1041 req
= list_first_entry(&buf
->rb_allreqs
,
1042 struct rpcrdma_req
, rl_all
);
1043 list_del(&req
->rl_all
);
1045 spin_unlock(&buf
->rb_reqslock
);
1046 rpcrdma_destroy_req(ia
, req
);
1047 spin_lock(&buf
->rb_reqslock
);
1049 spin_unlock(&buf
->rb_reqslock
);
1051 ia
->ri_ops
->ro_destroy(buf
);
1055 rpcrdma_get_mw(struct rpcrdma_xprt
*r_xprt
)
1057 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
1058 struct rpcrdma_mw
*mw
= NULL
;
1060 spin_lock(&buf
->rb_mwlock
);
1061 if (!list_empty(&buf
->rb_mws
)) {
1062 mw
= list_first_entry(&buf
->rb_mws
,
1063 struct rpcrdma_mw
, mw_list
);
1064 list_del_init(&mw
->mw_list
);
1066 spin_unlock(&buf
->rb_mwlock
);
1069 pr_err("RPC: %s: no MWs available\n", __func__
);
1074 rpcrdma_put_mw(struct rpcrdma_xprt
*r_xprt
, struct rpcrdma_mw
*mw
)
1076 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
1078 spin_lock(&buf
->rb_mwlock
);
1079 list_add_tail(&mw
->mw_list
, &buf
->rb_mws
);
1080 spin_unlock(&buf
->rb_mwlock
);
1084 * Get a set of request/reply buffers.
1086 * Reply buffer (if available) is attached to send buffer upon return.
1088 struct rpcrdma_req
*
1089 rpcrdma_buffer_get(struct rpcrdma_buffer
*buffers
)
1091 struct rpcrdma_req
*req
;
1093 spin_lock(&buffers
->rb_lock
);
1094 if (list_empty(&buffers
->rb_send_bufs
))
1096 req
= rpcrdma_buffer_get_req_locked(buffers
);
1097 if (list_empty(&buffers
->rb_recv_bufs
))
1099 req
->rl_reply
= rpcrdma_buffer_get_rep_locked(buffers
);
1100 spin_unlock(&buffers
->rb_lock
);
1104 spin_unlock(&buffers
->rb_lock
);
1105 pr_warn("RPC: %s: out of request buffers\n", __func__
);
1108 spin_unlock(&buffers
->rb_lock
);
1109 pr_warn("RPC: %s: out of reply buffers\n", __func__
);
1110 req
->rl_reply
= NULL
;
1115 * Put request/reply buffers back into pool.
1116 * Pre-decrement counter/array index.
1119 rpcrdma_buffer_put(struct rpcrdma_req
*req
)
1121 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1122 struct rpcrdma_rep
*rep
= req
->rl_reply
;
1125 req
->rl_reply
= NULL
;
1127 spin_lock(&buffers
->rb_lock
);
1128 list_add_tail(&req
->rl_free
, &buffers
->rb_send_bufs
);
1130 list_add_tail(&rep
->rr_list
, &buffers
->rb_recv_bufs
);
1131 spin_unlock(&buffers
->rb_lock
);
1135 * Recover reply buffers from pool.
1136 * This happens when recovering from disconnect.
1139 rpcrdma_recv_buffer_get(struct rpcrdma_req
*req
)
1141 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1143 spin_lock(&buffers
->rb_lock
);
1144 if (!list_empty(&buffers
->rb_recv_bufs
))
1145 req
->rl_reply
= rpcrdma_buffer_get_rep_locked(buffers
);
1146 spin_unlock(&buffers
->rb_lock
);
1150 * Put reply buffers back into pool when not attached to
1151 * request. This happens in error conditions.
1154 rpcrdma_recv_buffer_put(struct rpcrdma_rep
*rep
)
1156 struct rpcrdma_buffer
*buffers
= &rep
->rr_rxprt
->rx_buf
;
1158 spin_lock(&buffers
->rb_lock
);
1159 list_add_tail(&rep
->rr_list
, &buffers
->rb_recv_bufs
);
1160 spin_unlock(&buffers
->rb_lock
);
1164 * Wrappers for internal-use kmalloc memory registration, used by buffer code.
1168 rpcrdma_mapping_error(struct rpcrdma_mr_seg
*seg
)
1170 dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
1172 (unsigned long long)seg
->mr_dma
, seg
->mr_dmalen
);
1176 * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
1177 * @ia: controlling rpcrdma_ia
1178 * @size: size of buffer to be allocated, in bytes
1181 * Returns pointer to private header of an area of internally
1182 * registered memory, or an ERR_PTR. The registered buffer follows
1183 * the end of the private header.
1185 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
1186 * receiving the payload of RDMA RECV operations. regbufs are not
1187 * used for RDMA READ/WRITE operations, thus are registered only for
1190 struct rpcrdma_regbuf
*
1191 rpcrdma_alloc_regbuf(struct rpcrdma_ia
*ia
, size_t size
, gfp_t flags
)
1193 struct rpcrdma_regbuf
*rb
;
1196 rb
= kmalloc(sizeof(*rb
) + size
, flags
);
1201 iov
->addr
= ib_dma_map_single(ia
->ri_device
,
1202 (void *)rb
->rg_base
, size
,
1204 if (ib_dma_mapping_error(ia
->ri_device
, iov
->addr
))
1208 iov
->lkey
= ia
->ri_pd
->local_dma_lkey
;
1210 rb
->rg_owner
= NULL
;
1216 return ERR_PTR(-ENOMEM
);
1220 * rpcrdma_free_regbuf - deregister and free registered buffer
1221 * @ia: controlling rpcrdma_ia
1222 * @rb: regbuf to be deregistered and freed
1225 rpcrdma_free_regbuf(struct rpcrdma_ia
*ia
, struct rpcrdma_regbuf
*rb
)
1233 ib_dma_unmap_single(ia
->ri_device
,
1234 iov
->addr
, iov
->length
, DMA_BIDIRECTIONAL
);
1239 * Prepost any receive buffer, then post send.
1241 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1244 rpcrdma_ep_post(struct rpcrdma_ia
*ia
,
1245 struct rpcrdma_ep
*ep
,
1246 struct rpcrdma_req
*req
)
1248 struct ib_device
*device
= ia
->ri_device
;
1249 struct ib_send_wr send_wr
, *send_wr_fail
;
1250 struct rpcrdma_rep
*rep
= req
->rl_reply
;
1251 struct ib_sge
*iov
= req
->rl_send_iov
;
1255 rc
= rpcrdma_ep_post_recv(ia
, ep
, rep
);
1258 req
->rl_reply
= NULL
;
1261 send_wr
.next
= NULL
;
1262 send_wr
.wr_id
= RPCRDMA_IGNORE_COMPLETION
;
1263 send_wr
.sg_list
= iov
;
1264 send_wr
.num_sge
= req
->rl_niovs
;
1265 send_wr
.opcode
= IB_WR_SEND
;
1267 for (i
= 0; i
< send_wr
.num_sge
; i
++)
1268 ib_dma_sync_single_for_device(device
, iov
[i
].addr
,
1269 iov
[i
].length
, DMA_TO_DEVICE
);
1270 dprintk("RPC: %s: posting %d s/g entries\n",
1271 __func__
, send_wr
.num_sge
);
1273 if (DECR_CQCOUNT(ep
) > 0)
1274 send_wr
.send_flags
= 0;
1275 else { /* Provider must take a send completion every now and then */
1277 send_wr
.send_flags
= IB_SEND_SIGNALED
;
1280 rc
= ib_post_send(ia
->ri_id
->qp
, &send_wr
, &send_wr_fail
);
1282 dprintk("RPC: %s: ib_post_send returned %i\n", __func__
,
1289 * (Re)post a receive buffer.
1292 rpcrdma_ep_post_recv(struct rpcrdma_ia
*ia
,
1293 struct rpcrdma_ep
*ep
,
1294 struct rpcrdma_rep
*rep
)
1296 struct ib_recv_wr recv_wr
, *recv_wr_fail
;
1299 recv_wr
.next
= NULL
;
1300 recv_wr
.wr_id
= (u64
) (unsigned long) rep
;
1301 recv_wr
.sg_list
= &rep
->rr_rdmabuf
->rg_iov
;
1302 recv_wr
.num_sge
= 1;
1304 ib_dma_sync_single_for_cpu(ia
->ri_device
,
1305 rdmab_addr(rep
->rr_rdmabuf
),
1306 rdmab_length(rep
->rr_rdmabuf
),
1309 rc
= ib_post_recv(ia
->ri_id
->qp
, &recv_wr
, &recv_wr_fail
);
1312 dprintk("RPC: %s: ib_post_recv returned %i\n", __func__
,
1318 * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
1319 * @r_xprt: transport associated with these backchannel resources
1320 * @min_reqs: minimum number of incoming requests expected
1322 * Returns zero if all requested buffers were posted, or a negative errno.
1325 rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt
*r_xprt
, unsigned int count
)
1327 struct rpcrdma_buffer
*buffers
= &r_xprt
->rx_buf
;
1328 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
1329 struct rpcrdma_ep
*ep
= &r_xprt
->rx_ep
;
1330 struct rpcrdma_rep
*rep
;
1334 spin_lock(&buffers
->rb_lock
);
1335 if (list_empty(&buffers
->rb_recv_bufs
))
1337 rep
= rpcrdma_buffer_get_rep_locked(buffers
);
1338 spin_unlock(&buffers
->rb_lock
);
1340 rc
= rpcrdma_ep_post_recv(ia
, ep
, rep
);
1348 spin_unlock(&buffers
->rb_lock
);
1349 pr_warn("%s: no extra receive buffers\n", __func__
);
1353 rpcrdma_recv_buffer_put(rep
);
1357 /* How many chunk list items fit within our inline buffers?
1360 rpcrdma_max_segments(struct rpcrdma_xprt
*r_xprt
)
1362 struct rpcrdma_create_data_internal
*cdata
= &r_xprt
->rx_data
;
1363 int bytes
, segments
;
1365 bytes
= min_t(unsigned int, cdata
->inline_wsize
, cdata
->inline_rsize
);
1366 bytes
-= RPCRDMA_HDRLEN_MIN
;
1367 if (bytes
< sizeof(struct rpcrdma_segment
) * 2) {
1368 pr_warn("RPC: %s: inline threshold too small\n",
1373 segments
= 1 << (fls(bytes
/ sizeof(struct rpcrdma_segment
)) - 1);
1374 dprintk("RPC: %s: max chunk list size = %d segments\n",
1375 __func__
, segments
);