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
72 * handle replies in tasklet context, using a single, global list
73 * rdma tasklet function -- just turn around and call the func
74 * for all replies on the list
77 static DEFINE_SPINLOCK(rpcrdma_tk_lock_g
);
78 static LIST_HEAD(rpcrdma_tasklets_g
);
81 rpcrdma_run_tasklet(unsigned long data
)
83 struct rpcrdma_rep
*rep
;
87 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
88 while (!list_empty(&rpcrdma_tasklets_g
)) {
89 rep
= list_entry(rpcrdma_tasklets_g
.next
,
90 struct rpcrdma_rep
, rr_list
);
91 list_del(&rep
->rr_list
);
92 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
94 rpcrdma_reply_handler(rep
);
96 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
98 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
101 static DECLARE_TASKLET(rpcrdma_tasklet_g
, rpcrdma_run_tasklet
, 0UL);
104 rpcrdma_schedule_tasklet(struct list_head
*sched_list
)
108 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
109 list_splice_tail(sched_list
, &rpcrdma_tasklets_g
);
110 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
111 tasklet_schedule(&rpcrdma_tasklet_g
);
115 rpcrdma_qp_async_error_upcall(struct ib_event
*event
, void *context
)
117 struct rpcrdma_ep
*ep
= context
;
119 pr_err("RPC: %s: %s on device %s ep %p\n",
120 __func__
, ib_event_msg(event
->event
),
121 event
->device
->name
, context
);
122 if (ep
->rep_connected
== 1) {
123 ep
->rep_connected
= -EIO
;
124 rpcrdma_conn_func(ep
);
125 wake_up_all(&ep
->rep_connect_wait
);
130 rpcrdma_cq_async_error_upcall(struct ib_event
*event
, void *context
)
132 struct rpcrdma_ep
*ep
= context
;
134 pr_err("RPC: %s: %s on device %s ep %p\n",
135 __func__
, ib_event_msg(event
->event
),
136 event
->device
->name
, context
);
137 if (ep
->rep_connected
== 1) {
138 ep
->rep_connected
= -EIO
;
139 rpcrdma_conn_func(ep
);
140 wake_up_all(&ep
->rep_connect_wait
);
145 rpcrdma_sendcq_process_wc(struct ib_wc
*wc
)
147 /* WARNING: Only wr_id and status are reliable at this point */
148 if (wc
->wr_id
== RPCRDMA_IGNORE_COMPLETION
) {
149 if (wc
->status
!= IB_WC_SUCCESS
&&
150 wc
->status
!= IB_WC_WR_FLUSH_ERR
)
151 pr_err("RPC: %s: SEND: %s\n",
152 __func__
, ib_wc_status_msg(wc
->status
));
154 struct rpcrdma_mw
*r
;
156 r
= (struct rpcrdma_mw
*)(unsigned long)wc
->wr_id
;
157 r
->mw_sendcompletion(wc
);
162 rpcrdma_sendcq_poll(struct ib_cq
*cq
, struct rpcrdma_ep
*ep
)
165 int budget
, count
, rc
;
167 budget
= RPCRDMA_WC_BUDGET
/ RPCRDMA_POLLSIZE
;
169 wcs
= ep
->rep_send_wcs
;
171 rc
= ib_poll_cq(cq
, RPCRDMA_POLLSIZE
, wcs
);
177 rpcrdma_sendcq_process_wc(wcs
++);
178 } while (rc
== RPCRDMA_POLLSIZE
&& --budget
);
183 * Handle send, fast_reg_mr, and local_inv completions.
185 * Send events are typically suppressed and thus do not result
186 * in an upcall. Occasionally one is signaled, however. This
187 * prevents the provider's completion queue from wrapping and
188 * losing a completion.
191 rpcrdma_sendcq_upcall(struct ib_cq
*cq
, void *cq_context
)
193 struct rpcrdma_ep
*ep
= (struct rpcrdma_ep
*)cq_context
;
196 rc
= rpcrdma_sendcq_poll(cq
, ep
);
198 dprintk("RPC: %s: ib_poll_cq failed: %i\n",
203 rc
= ib_req_notify_cq(cq
,
204 IB_CQ_NEXT_COMP
| IB_CQ_REPORT_MISSED_EVENTS
);
208 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
213 rpcrdma_sendcq_poll(cq
, ep
);
217 rpcrdma_recvcq_process_wc(struct ib_wc
*wc
, struct list_head
*sched_list
)
219 struct rpcrdma_rep
*rep
=
220 (struct rpcrdma_rep
*)(unsigned long)wc
->wr_id
;
222 /* WARNING: Only wr_id and status are reliable at this point */
223 if (wc
->status
!= IB_WC_SUCCESS
)
226 /* status == SUCCESS means all fields in wc are trustworthy */
227 if (wc
->opcode
!= IB_WC_RECV
)
230 dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
231 __func__
, rep
, wc
->byte_len
);
233 rep
->rr_len
= wc
->byte_len
;
234 ib_dma_sync_single_for_cpu(rep
->rr_device
,
235 rdmab_addr(rep
->rr_rdmabuf
),
236 rep
->rr_len
, DMA_FROM_DEVICE
);
237 prefetch(rdmab_to_msg(rep
->rr_rdmabuf
));
240 list_add_tail(&rep
->rr_list
, sched_list
);
243 if (wc
->status
!= IB_WC_WR_FLUSH_ERR
)
244 pr_err("RPC: %s: rep %p: %s\n",
245 __func__
, rep
, ib_wc_status_msg(wc
->status
));
251 rpcrdma_recvcq_poll(struct ib_cq
*cq
, struct rpcrdma_ep
*ep
)
253 struct list_head sched_list
;
255 int budget
, count
, rc
;
257 INIT_LIST_HEAD(&sched_list
);
258 budget
= RPCRDMA_WC_BUDGET
/ RPCRDMA_POLLSIZE
;
260 wcs
= ep
->rep_recv_wcs
;
262 rc
= ib_poll_cq(cq
, RPCRDMA_POLLSIZE
, wcs
);
268 rpcrdma_recvcq_process_wc(wcs
++, &sched_list
);
269 } while (rc
== RPCRDMA_POLLSIZE
&& --budget
);
273 rpcrdma_schedule_tasklet(&sched_list
);
278 * Handle receive completions.
280 * It is reentrant but processes single events in order to maintain
281 * ordering of receives to keep server credits.
283 * It is the responsibility of the scheduled tasklet to return
284 * recv buffers to the pool. NOTE: this affects synchronization of
285 * connection shutdown. That is, the structures required for
286 * the completion of the reply handler must remain intact until
287 * all memory has been reclaimed.
290 rpcrdma_recvcq_upcall(struct ib_cq
*cq
, void *cq_context
)
292 struct rpcrdma_ep
*ep
= (struct rpcrdma_ep
*)cq_context
;
295 rc
= rpcrdma_recvcq_poll(cq
, ep
);
297 dprintk("RPC: %s: ib_poll_cq failed: %i\n",
302 rc
= ib_req_notify_cq(cq
,
303 IB_CQ_NEXT_COMP
| IB_CQ_REPORT_MISSED_EVENTS
);
307 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
312 rpcrdma_recvcq_poll(cq
, ep
);
316 rpcrdma_flush_cqs(struct rpcrdma_ep
*ep
)
319 LIST_HEAD(sched_list
);
321 while (ib_poll_cq(ep
->rep_attr
.recv_cq
, 1, &wc
) > 0)
322 rpcrdma_recvcq_process_wc(&wc
, &sched_list
);
323 if (!list_empty(&sched_list
))
324 rpcrdma_schedule_tasklet(&sched_list
);
325 while (ib_poll_cq(ep
->rep_attr
.send_cq
, 1, &wc
) > 0)
326 rpcrdma_sendcq_process_wc(&wc
);
330 rpcrdma_conn_upcall(struct rdma_cm_id
*id
, struct rdma_cm_event
*event
)
332 struct rpcrdma_xprt
*xprt
= id
->context
;
333 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
334 struct rpcrdma_ep
*ep
= &xprt
->rx_ep
;
335 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
336 struct sockaddr
*sap
= (struct sockaddr
*)&ep
->rep_remote_addr
;
338 struct ib_qp_attr
*attr
= &ia
->ri_qp_attr
;
339 struct ib_qp_init_attr
*iattr
= &ia
->ri_qp_init_attr
;
342 switch (event
->event
) {
343 case RDMA_CM_EVENT_ADDR_RESOLVED
:
344 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
346 complete(&ia
->ri_done
);
348 case RDMA_CM_EVENT_ADDR_ERROR
:
349 ia
->ri_async_rc
= -EHOSTUNREACH
;
350 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
352 complete(&ia
->ri_done
);
354 case RDMA_CM_EVENT_ROUTE_ERROR
:
355 ia
->ri_async_rc
= -ENETUNREACH
;
356 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
358 complete(&ia
->ri_done
);
360 case RDMA_CM_EVENT_ESTABLISHED
:
362 ib_query_qp(ia
->ri_id
->qp
, attr
,
363 IB_QP_MAX_QP_RD_ATOMIC
| IB_QP_MAX_DEST_RD_ATOMIC
,
365 dprintk("RPC: %s: %d responder resources"
367 __func__
, attr
->max_dest_rd_atomic
,
368 attr
->max_rd_atomic
);
370 case RDMA_CM_EVENT_CONNECT_ERROR
:
371 connstate
= -ENOTCONN
;
373 case RDMA_CM_EVENT_UNREACHABLE
:
374 connstate
= -ENETDOWN
;
376 case RDMA_CM_EVENT_REJECTED
:
377 connstate
= -ECONNREFUSED
;
379 case RDMA_CM_EVENT_DISCONNECTED
:
380 connstate
= -ECONNABORTED
;
382 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
385 dprintk("RPC: %s: %sconnected\n",
386 __func__
, connstate
> 0 ? "" : "dis");
387 ep
->rep_connected
= connstate
;
388 rpcrdma_conn_func(ep
);
389 wake_up_all(&ep
->rep_connect_wait
);
392 dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
393 __func__
, sap
, rpc_get_port(sap
), ep
,
394 rdma_event_msg(event
->event
));
398 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
399 if (connstate
== 1) {
400 int ird
= attr
->max_dest_rd_atomic
;
401 int tird
= ep
->rep_remote_cma
.responder_resources
;
403 pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
404 sap
, rpc_get_port(sap
),
406 ia
->ri_ops
->ro_displayname
,
407 xprt
->rx_buf
.rb_max_requests
,
408 ird
, ird
< 4 && ird
< tird
/ 2 ? " (low!)" : "");
409 } else if (connstate
< 0) {
410 pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
411 sap
, rpc_get_port(sap
), connstate
);
418 static void rpcrdma_destroy_id(struct rdma_cm_id
*id
)
421 module_put(id
->device
->owner
);
426 static struct rdma_cm_id
*
427 rpcrdma_create_id(struct rpcrdma_xprt
*xprt
,
428 struct rpcrdma_ia
*ia
, struct sockaddr
*addr
)
430 struct rdma_cm_id
*id
;
433 init_completion(&ia
->ri_done
);
435 id
= rdma_create_id(rpcrdma_conn_upcall
, xprt
, RDMA_PS_TCP
, IB_QPT_RC
);
438 dprintk("RPC: %s: rdma_create_id() failed %i\n",
443 ia
->ri_async_rc
= -ETIMEDOUT
;
444 rc
= rdma_resolve_addr(id
, NULL
, addr
, RDMA_RESOLVE_TIMEOUT
);
446 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
450 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
451 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
454 * Until xprtrdma supports DEVICE_REMOVAL, the provider must
455 * be pinned while there are active NFS/RDMA mounts to prevent
456 * hangs and crashes at umount time.
458 if (!ia
->ri_async_rc
&& !try_module_get(id
->device
->owner
)) {
459 dprintk("RPC: %s: Failed to get device module\n",
461 ia
->ri_async_rc
= -ENODEV
;
463 rc
= ia
->ri_async_rc
;
467 ia
->ri_async_rc
= -ETIMEDOUT
;
468 rc
= rdma_resolve_route(id
, RDMA_RESOLVE_TIMEOUT
);
470 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
474 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
475 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
476 rc
= ia
->ri_async_rc
;
482 module_put(id
->device
->owner
);
489 * Drain any cq, prior to teardown.
492 rpcrdma_clean_cq(struct ib_cq
*cq
)
497 while (1 == ib_poll_cq(cq
, 1, &wc
))
501 dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
502 __func__
, count
, wc
.opcode
);
506 * Exported functions.
510 * Open and initialize an Interface Adapter.
511 * o initializes fields of struct rpcrdma_ia, including
512 * interface and provider attributes and protection zone.
515 rpcrdma_ia_open(struct rpcrdma_xprt
*xprt
, struct sockaddr
*addr
, int memreg
)
517 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
518 struct ib_device_attr
*devattr
= &ia
->ri_devattr
;
521 ia
->ri_dma_mr
= NULL
;
523 ia
->ri_id
= rpcrdma_create_id(xprt
, ia
, addr
);
524 if (IS_ERR(ia
->ri_id
)) {
525 rc
= PTR_ERR(ia
->ri_id
);
528 ia
->ri_device
= ia
->ri_id
->device
;
530 ia
->ri_pd
= ib_alloc_pd(ia
->ri_device
);
531 if (IS_ERR(ia
->ri_pd
)) {
532 rc
= PTR_ERR(ia
->ri_pd
);
533 dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
538 rc
= ib_query_device(ia
->ri_device
, devattr
);
540 dprintk("RPC: %s: ib_query_device failed %d\n",
545 if (memreg
== RPCRDMA_FRMR
) {
546 /* Requires both frmr reg and local dma lkey */
547 if (((devattr
->device_cap_flags
&
548 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) !=
549 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) ||
550 (devattr
->max_fast_reg_page_list_len
== 0)) {
551 dprintk("RPC: %s: FRMR registration "
552 "not supported by HCA\n", __func__
);
553 memreg
= RPCRDMA_MTHCAFMR
;
556 if (memreg
== RPCRDMA_MTHCAFMR
) {
557 if (!ia
->ri_device
->alloc_fmr
) {
558 dprintk("RPC: %s: MTHCAFMR registration "
559 "not supported by HCA\n", __func__
);
566 ia
->ri_ops
= &rpcrdma_frwr_memreg_ops
;
568 case RPCRDMA_ALLPHYSICAL
:
569 ia
->ri_ops
= &rpcrdma_physical_memreg_ops
;
571 case RPCRDMA_MTHCAFMR
:
572 ia
->ri_ops
= &rpcrdma_fmr_memreg_ops
;
575 printk(KERN_ERR
"RPC: Unsupported memory "
576 "registration mode: %d\n", memreg
);
580 dprintk("RPC: %s: memory registration strategy is '%s'\n",
581 __func__
, ia
->ri_ops
->ro_displayname
);
583 rwlock_init(&ia
->ri_qplock
);
587 ib_dealloc_pd(ia
->ri_pd
);
590 rpcrdma_destroy_id(ia
->ri_id
);
597 * Clean up/close an IA.
598 * o if event handles and PD have been initialized, free them.
602 rpcrdma_ia_close(struct rpcrdma_ia
*ia
)
604 dprintk("RPC: %s: entering\n", __func__
);
605 if (ia
->ri_id
!= NULL
&& !IS_ERR(ia
->ri_id
)) {
607 rdma_destroy_qp(ia
->ri_id
);
608 rpcrdma_destroy_id(ia
->ri_id
);
612 /* If the pd is still busy, xprtrdma missed freeing a resource */
613 if (ia
->ri_pd
&& !IS_ERR(ia
->ri_pd
))
614 WARN_ON(ib_dealloc_pd(ia
->ri_pd
));
618 * Create unconnected endpoint.
621 rpcrdma_ep_create(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
,
622 struct rpcrdma_create_data_internal
*cdata
)
624 struct ib_device_attr
*devattr
= &ia
->ri_devattr
;
625 struct ib_cq
*sendcq
, *recvcq
;
626 struct ib_cq_init_attr cq_attr
= {};
629 if (devattr
->max_sge
< RPCRDMA_MAX_IOVS
) {
630 dprintk("RPC: %s: insufficient sge's available\n",
635 /* check provider's send/recv wr limits */
636 if (cdata
->max_requests
> devattr
->max_qp_wr
)
637 cdata
->max_requests
= devattr
->max_qp_wr
;
639 ep
->rep_attr
.event_handler
= rpcrdma_qp_async_error_upcall
;
640 ep
->rep_attr
.qp_context
= ep
;
641 ep
->rep_attr
.srq
= NULL
;
642 ep
->rep_attr
.cap
.max_send_wr
= cdata
->max_requests
;
643 rc
= ia
->ri_ops
->ro_open(ia
, ep
, cdata
);
646 ep
->rep_attr
.cap
.max_recv_wr
= cdata
->max_requests
;
647 ep
->rep_attr
.cap
.max_send_sge
= RPCRDMA_MAX_IOVS
;
648 ep
->rep_attr
.cap
.max_recv_sge
= 1;
649 ep
->rep_attr
.cap
.max_inline_data
= 0;
650 ep
->rep_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
651 ep
->rep_attr
.qp_type
= IB_QPT_RC
;
652 ep
->rep_attr
.port_num
= ~0;
654 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
655 "iovs: send %d recv %d\n",
657 ep
->rep_attr
.cap
.max_send_wr
,
658 ep
->rep_attr
.cap
.max_recv_wr
,
659 ep
->rep_attr
.cap
.max_send_sge
,
660 ep
->rep_attr
.cap
.max_recv_sge
);
662 /* set trigger for requesting send completion */
663 ep
->rep_cqinit
= ep
->rep_attr
.cap
.max_send_wr
/2 - 1;
664 if (ep
->rep_cqinit
> RPCRDMA_MAX_UNSIGNALED_SENDS
)
665 ep
->rep_cqinit
= RPCRDMA_MAX_UNSIGNALED_SENDS
;
666 else if (ep
->rep_cqinit
<= 2)
669 init_waitqueue_head(&ep
->rep_connect_wait
);
670 INIT_DELAYED_WORK(&ep
->rep_connect_worker
, rpcrdma_connect_worker
);
672 cq_attr
.cqe
= ep
->rep_attr
.cap
.max_send_wr
+ 1;
673 sendcq
= ib_create_cq(ia
->ri_device
, rpcrdma_sendcq_upcall
,
674 rpcrdma_cq_async_error_upcall
, ep
, &cq_attr
);
675 if (IS_ERR(sendcq
)) {
676 rc
= PTR_ERR(sendcq
);
677 dprintk("RPC: %s: failed to create send CQ: %i\n",
682 rc
= ib_req_notify_cq(sendcq
, IB_CQ_NEXT_COMP
);
684 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
689 cq_attr
.cqe
= ep
->rep_attr
.cap
.max_recv_wr
+ 1;
690 recvcq
= ib_create_cq(ia
->ri_device
, rpcrdma_recvcq_upcall
,
691 rpcrdma_cq_async_error_upcall
, ep
, &cq_attr
);
692 if (IS_ERR(recvcq
)) {
693 rc
= PTR_ERR(recvcq
);
694 dprintk("RPC: %s: failed to create recv CQ: %i\n",
699 rc
= ib_req_notify_cq(recvcq
, IB_CQ_NEXT_COMP
);
701 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
703 ib_destroy_cq(recvcq
);
707 ep
->rep_attr
.send_cq
= sendcq
;
708 ep
->rep_attr
.recv_cq
= recvcq
;
710 /* Initialize cma parameters */
712 /* RPC/RDMA does not use private data */
713 ep
->rep_remote_cma
.private_data
= NULL
;
714 ep
->rep_remote_cma
.private_data_len
= 0;
716 /* Client offers RDMA Read but does not initiate */
717 ep
->rep_remote_cma
.initiator_depth
= 0;
718 if (devattr
->max_qp_rd_atom
> 32) /* arbitrary but <= 255 */
719 ep
->rep_remote_cma
.responder_resources
= 32;
721 ep
->rep_remote_cma
.responder_resources
=
722 devattr
->max_qp_rd_atom
;
724 ep
->rep_remote_cma
.retry_count
= 7;
725 ep
->rep_remote_cma
.flow_control
= 0;
726 ep
->rep_remote_cma
.rnr_retry_count
= 0;
731 err
= ib_destroy_cq(sendcq
);
733 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
737 ib_dereg_mr(ia
->ri_dma_mr
);
744 * Disconnect and destroy endpoint. After this, the only
745 * valid operations on the ep are to free it (if dynamically
746 * allocated) or re-create it.
749 rpcrdma_ep_destroy(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
753 dprintk("RPC: %s: entering, connected is %d\n",
754 __func__
, ep
->rep_connected
);
756 cancel_delayed_work_sync(&ep
->rep_connect_worker
);
759 rpcrdma_ep_disconnect(ep
, ia
);
761 rpcrdma_clean_cq(ep
->rep_attr
.recv_cq
);
762 rpcrdma_clean_cq(ep
->rep_attr
.send_cq
);
765 rdma_destroy_qp(ia
->ri_id
);
766 ia
->ri_id
->qp
= NULL
;
769 rc
= ib_destroy_cq(ep
->rep_attr
.recv_cq
);
771 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
774 rc
= ib_destroy_cq(ep
->rep_attr
.send_cq
);
776 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
780 rc
= ib_dereg_mr(ia
->ri_dma_mr
);
781 dprintk("RPC: %s: ib_dereg_mr returned %i\n",
787 * Connect unconnected endpoint.
790 rpcrdma_ep_connect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
792 struct rdma_cm_id
*id
, *old
;
796 if (ep
->rep_connected
!= 0) {
797 struct rpcrdma_xprt
*xprt
;
799 dprintk("RPC: %s: reconnecting...\n", __func__
);
801 rpcrdma_ep_disconnect(ep
, ia
);
802 rpcrdma_flush_cqs(ep
);
804 xprt
= container_of(ia
, struct rpcrdma_xprt
, rx_ia
);
805 id
= rpcrdma_create_id(xprt
, ia
,
806 (struct sockaddr
*)&xprt
->rx_data
.addr
);
811 /* TEMP TEMP TEMP - fail if new device:
812 * Deregister/remarshal *all* requests!
813 * Close and recreate adapter, pd, etc!
814 * Re-determine all attributes still sane!
815 * More stuff I haven't thought of!
818 if (ia
->ri_device
!= id
->device
) {
819 printk("RPC: %s: can't reconnect on "
820 "different device!\n", __func__
);
821 rpcrdma_destroy_id(id
);
826 rc
= rdma_create_qp(id
, ia
->ri_pd
, &ep
->rep_attr
);
828 dprintk("RPC: %s: rdma_create_qp failed %i\n",
830 rpcrdma_destroy_id(id
);
835 write_lock(&ia
->ri_qplock
);
838 write_unlock(&ia
->ri_qplock
);
840 rdma_destroy_qp(old
);
841 rpcrdma_destroy_id(old
);
843 dprintk("RPC: %s: connecting...\n", __func__
);
844 rc
= rdma_create_qp(ia
->ri_id
, ia
->ri_pd
, &ep
->rep_attr
);
846 dprintk("RPC: %s: rdma_create_qp failed %i\n",
848 /* do not update ep->rep_connected */
853 ep
->rep_connected
= 0;
855 rc
= rdma_connect(ia
->ri_id
, &ep
->rep_remote_cma
);
857 dprintk("RPC: %s: rdma_connect() failed with %i\n",
862 wait_event_interruptible(ep
->rep_connect_wait
, ep
->rep_connected
!= 0);
865 * Check state. A non-peer reject indicates no listener
866 * (ECONNREFUSED), which may be a transient state. All
867 * others indicate a transport condition which has already
868 * undergone a best-effort.
870 if (ep
->rep_connected
== -ECONNREFUSED
&&
871 ++retry_count
<= RDMA_CONNECT_RETRY_MAX
) {
872 dprintk("RPC: %s: non-peer_reject, retry\n", __func__
);
875 if (ep
->rep_connected
<= 0) {
876 /* Sometimes, the only way to reliably connect to remote
877 * CMs is to use same nonzero values for ORD and IRD. */
878 if (retry_count
++ <= RDMA_CONNECT_RETRY_MAX
+ 1 &&
879 (ep
->rep_remote_cma
.responder_resources
== 0 ||
880 ep
->rep_remote_cma
.initiator_depth
!=
881 ep
->rep_remote_cma
.responder_resources
)) {
882 if (ep
->rep_remote_cma
.responder_resources
== 0)
883 ep
->rep_remote_cma
.responder_resources
= 1;
884 ep
->rep_remote_cma
.initiator_depth
=
885 ep
->rep_remote_cma
.responder_resources
;
888 rc
= ep
->rep_connected
;
890 dprintk("RPC: %s: connected\n", __func__
);
895 ep
->rep_connected
= rc
;
900 * rpcrdma_ep_disconnect
902 * This is separate from destroy to facilitate the ability
903 * to reconnect without recreating the endpoint.
905 * This call is not reentrant, and must not be made in parallel
906 * on the same endpoint.
909 rpcrdma_ep_disconnect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
913 rpcrdma_flush_cqs(ep
);
914 rc
= rdma_disconnect(ia
->ri_id
);
916 /* returns without wait if not connected */
917 wait_event_interruptible(ep
->rep_connect_wait
,
918 ep
->rep_connected
!= 1);
919 dprintk("RPC: %s: after wait, %sconnected\n", __func__
,
920 (ep
->rep_connected
== 1) ? "still " : "dis");
922 dprintk("RPC: %s: rdma_disconnect %i\n", __func__
, rc
);
923 ep
->rep_connected
= rc
;
927 static struct rpcrdma_req
*
928 rpcrdma_create_req(struct rpcrdma_xprt
*r_xprt
)
930 struct rpcrdma_req
*req
;
932 req
= kzalloc(sizeof(*req
), GFP_KERNEL
);
934 return ERR_PTR(-ENOMEM
);
936 req
->rl_buffer
= &r_xprt
->rx_buf
;
940 static struct rpcrdma_rep
*
941 rpcrdma_create_rep(struct rpcrdma_xprt
*r_xprt
)
943 struct rpcrdma_create_data_internal
*cdata
= &r_xprt
->rx_data
;
944 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
945 struct rpcrdma_rep
*rep
;
949 rep
= kzalloc(sizeof(*rep
), GFP_KERNEL
);
953 rep
->rr_rdmabuf
= rpcrdma_alloc_regbuf(ia
, cdata
->inline_rsize
,
955 if (IS_ERR(rep
->rr_rdmabuf
)) {
956 rc
= PTR_ERR(rep
->rr_rdmabuf
);
960 rep
->rr_device
= ia
->ri_device
;
961 rep
->rr_rxprt
= r_xprt
;
971 rpcrdma_buffer_create(struct rpcrdma_xprt
*r_xprt
)
973 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
974 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
975 struct rpcrdma_create_data_internal
*cdata
= &r_xprt
->rx_data
;
980 buf
->rb_max_requests
= cdata
->max_requests
;
981 spin_lock_init(&buf
->rb_lock
);
984 * 1. arrays for send and recv pointers
985 * 2. arrays of struct rpcrdma_req to fill in pointers
986 * 3. array of struct rpcrdma_rep for replies
987 * Send/recv buffers in req/rep need to be registered
989 len
= buf
->rb_max_requests
*
990 (sizeof(struct rpcrdma_req
*) + sizeof(struct rpcrdma_rep
*));
992 p
= kzalloc(len
, GFP_KERNEL
);
994 dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
999 buf
->rb_pool
= p
; /* for freeing it later */
1001 buf
->rb_send_bufs
= (struct rpcrdma_req
**) p
;
1002 p
= (char *) &buf
->rb_send_bufs
[buf
->rb_max_requests
];
1003 buf
->rb_recv_bufs
= (struct rpcrdma_rep
**) p
;
1004 p
= (char *) &buf
->rb_recv_bufs
[buf
->rb_max_requests
];
1006 rc
= ia
->ri_ops
->ro_init(r_xprt
);
1010 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1011 struct rpcrdma_req
*req
;
1012 struct rpcrdma_rep
*rep
;
1014 req
= rpcrdma_create_req(r_xprt
);
1016 dprintk("RPC: %s: request buffer %d alloc"
1017 " failed\n", __func__
, i
);
1021 buf
->rb_send_bufs
[i
] = req
;
1023 rep
= rpcrdma_create_rep(r_xprt
);
1025 dprintk("RPC: %s: reply buffer %d alloc failed\n",
1030 buf
->rb_recv_bufs
[i
] = rep
;
1035 rpcrdma_buffer_destroy(buf
);
1040 rpcrdma_destroy_rep(struct rpcrdma_ia
*ia
, struct rpcrdma_rep
*rep
)
1045 rpcrdma_free_regbuf(ia
, rep
->rr_rdmabuf
);
1050 rpcrdma_destroy_req(struct rpcrdma_ia
*ia
, struct rpcrdma_req
*req
)
1055 rpcrdma_free_regbuf(ia
, req
->rl_sendbuf
);
1056 rpcrdma_free_regbuf(ia
, req
->rl_rdmabuf
);
1061 rpcrdma_buffer_destroy(struct rpcrdma_buffer
*buf
)
1063 struct rpcrdma_ia
*ia
= rdmab_to_ia(buf
);
1066 /* clean up in reverse order from create
1067 * 1. recv mr memory (mr free, then kfree)
1068 * 2. send mr memory (mr free, then kfree)
1071 dprintk("RPC: %s: entering\n", __func__
);
1073 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1074 if (buf
->rb_recv_bufs
)
1075 rpcrdma_destroy_rep(ia
, buf
->rb_recv_bufs
[i
]);
1076 if (buf
->rb_send_bufs
)
1077 rpcrdma_destroy_req(ia
, buf
->rb_send_bufs
[i
]);
1080 ia
->ri_ops
->ro_destroy(buf
);
1082 kfree(buf
->rb_pool
);
1086 rpcrdma_get_mw(struct rpcrdma_xprt
*r_xprt
)
1088 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
1089 struct rpcrdma_mw
*mw
= NULL
;
1091 spin_lock(&buf
->rb_mwlock
);
1092 if (!list_empty(&buf
->rb_mws
)) {
1093 mw
= list_first_entry(&buf
->rb_mws
,
1094 struct rpcrdma_mw
, mw_list
);
1095 list_del_init(&mw
->mw_list
);
1097 spin_unlock(&buf
->rb_mwlock
);
1100 pr_err("RPC: %s: no MWs available\n", __func__
);
1105 rpcrdma_put_mw(struct rpcrdma_xprt
*r_xprt
, struct rpcrdma_mw
*mw
)
1107 struct rpcrdma_buffer
*buf
= &r_xprt
->rx_buf
;
1109 spin_lock(&buf
->rb_mwlock
);
1110 list_add_tail(&mw
->mw_list
, &buf
->rb_mws
);
1111 spin_unlock(&buf
->rb_mwlock
);
1115 rpcrdma_buffer_put_sendbuf(struct rpcrdma_req
*req
, struct rpcrdma_buffer
*buf
)
1117 buf
->rb_send_bufs
[--buf
->rb_send_index
] = req
;
1119 if (req
->rl_reply
) {
1120 buf
->rb_recv_bufs
[--buf
->rb_recv_index
] = req
->rl_reply
;
1121 req
->rl_reply
= NULL
;
1126 * Get a set of request/reply buffers.
1128 * Reply buffer (if needed) is attached to send buffer upon return.
1130 * rb_send_index and rb_recv_index MUST always be pointing to the
1131 * *next* available buffer (non-NULL). They are incremented after
1132 * removing buffers, and decremented *before* returning them.
1134 struct rpcrdma_req
*
1135 rpcrdma_buffer_get(struct rpcrdma_buffer
*buffers
)
1137 struct rpcrdma_req
*req
;
1138 unsigned long flags
;
1140 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1142 if (buffers
->rb_send_index
== buffers
->rb_max_requests
) {
1143 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1144 dprintk("RPC: %s: out of request buffers\n", __func__
);
1145 return ((struct rpcrdma_req
*)NULL
);
1148 req
= buffers
->rb_send_bufs
[buffers
->rb_send_index
];
1149 if (buffers
->rb_send_index
< buffers
->rb_recv_index
) {
1150 dprintk("RPC: %s: %d extra receives outstanding (ok)\n",
1152 buffers
->rb_recv_index
- buffers
->rb_send_index
);
1153 req
->rl_reply
= NULL
;
1155 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1156 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1158 buffers
->rb_send_bufs
[buffers
->rb_send_index
++] = NULL
;
1160 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1165 * Put request/reply buffers back into pool.
1166 * Pre-decrement counter/array index.
1169 rpcrdma_buffer_put(struct rpcrdma_req
*req
)
1171 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1172 unsigned long flags
;
1174 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1175 rpcrdma_buffer_put_sendbuf(req
, buffers
);
1176 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1180 * Recover reply buffers from pool.
1181 * This happens when recovering from error conditions.
1182 * Post-increment counter/array index.
1185 rpcrdma_recv_buffer_get(struct rpcrdma_req
*req
)
1187 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1188 unsigned long flags
;
1190 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1191 if (buffers
->rb_recv_index
< buffers
->rb_max_requests
) {
1192 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1193 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1195 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1199 * Put reply buffers back into pool when not attached to
1200 * request. This happens in error conditions.
1203 rpcrdma_recv_buffer_put(struct rpcrdma_rep
*rep
)
1205 struct rpcrdma_buffer
*buffers
= &rep
->rr_rxprt
->rx_buf
;
1206 unsigned long flags
;
1208 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1209 buffers
->rb_recv_bufs
[--buffers
->rb_recv_index
] = rep
;
1210 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1214 * Wrappers for internal-use kmalloc memory registration, used by buffer code.
1218 rpcrdma_mapping_error(struct rpcrdma_mr_seg
*seg
)
1220 dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
1222 (unsigned long long)seg
->mr_dma
, seg
->mr_dmalen
);
1226 * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
1227 * @ia: controlling rpcrdma_ia
1228 * @size: size of buffer to be allocated, in bytes
1231 * Returns pointer to private header of an area of internally
1232 * registered memory, or an ERR_PTR. The registered buffer follows
1233 * the end of the private header.
1235 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
1236 * receiving the payload of RDMA RECV operations. regbufs are not
1237 * used for RDMA READ/WRITE operations, thus are registered only for
1240 struct rpcrdma_regbuf
*
1241 rpcrdma_alloc_regbuf(struct rpcrdma_ia
*ia
, size_t size
, gfp_t flags
)
1243 struct rpcrdma_regbuf
*rb
;
1246 rb
= kmalloc(sizeof(*rb
) + size
, flags
);
1251 iov
->addr
= ib_dma_map_single(ia
->ri_device
,
1252 (void *)rb
->rg_base
, size
,
1254 if (ib_dma_mapping_error(ia
->ri_device
, iov
->addr
))
1258 iov
->lkey
= ia
->ri_dma_lkey
;
1260 rb
->rg_owner
= NULL
;
1266 return ERR_PTR(-ENOMEM
);
1270 * rpcrdma_free_regbuf - deregister and free registered buffer
1271 * @ia: controlling rpcrdma_ia
1272 * @rb: regbuf to be deregistered and freed
1275 rpcrdma_free_regbuf(struct rpcrdma_ia
*ia
, struct rpcrdma_regbuf
*rb
)
1283 ib_dma_unmap_single(ia
->ri_device
,
1284 iov
->addr
, iov
->length
, DMA_BIDIRECTIONAL
);
1289 * Prepost any receive buffer, then post send.
1291 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1294 rpcrdma_ep_post(struct rpcrdma_ia
*ia
,
1295 struct rpcrdma_ep
*ep
,
1296 struct rpcrdma_req
*req
)
1298 struct ib_device
*device
= ia
->ri_device
;
1299 struct ib_send_wr send_wr
, *send_wr_fail
;
1300 struct rpcrdma_rep
*rep
= req
->rl_reply
;
1301 struct ib_sge
*iov
= req
->rl_send_iov
;
1305 rc
= rpcrdma_ep_post_recv(ia
, ep
, rep
);
1308 req
->rl_reply
= NULL
;
1311 send_wr
.next
= NULL
;
1312 send_wr
.wr_id
= RPCRDMA_IGNORE_COMPLETION
;
1313 send_wr
.sg_list
= iov
;
1314 send_wr
.num_sge
= req
->rl_niovs
;
1315 send_wr
.opcode
= IB_WR_SEND
;
1317 for (i
= 0; i
< send_wr
.num_sge
; i
++)
1318 ib_dma_sync_single_for_device(device
, iov
[i
].addr
,
1319 iov
[i
].length
, DMA_TO_DEVICE
);
1320 dprintk("RPC: %s: posting %d s/g entries\n",
1321 __func__
, send_wr
.num_sge
);
1323 if (DECR_CQCOUNT(ep
) > 0)
1324 send_wr
.send_flags
= 0;
1325 else { /* Provider must take a send completion every now and then */
1327 send_wr
.send_flags
= IB_SEND_SIGNALED
;
1330 rc
= ib_post_send(ia
->ri_id
->qp
, &send_wr
, &send_wr_fail
);
1332 dprintk("RPC: %s: ib_post_send returned %i\n", __func__
,
1339 * (Re)post a receive buffer.
1342 rpcrdma_ep_post_recv(struct rpcrdma_ia
*ia
,
1343 struct rpcrdma_ep
*ep
,
1344 struct rpcrdma_rep
*rep
)
1346 struct ib_recv_wr recv_wr
, *recv_wr_fail
;
1349 recv_wr
.next
= NULL
;
1350 recv_wr
.wr_id
= (u64
) (unsigned long) rep
;
1351 recv_wr
.sg_list
= &rep
->rr_rdmabuf
->rg_iov
;
1352 recv_wr
.num_sge
= 1;
1354 ib_dma_sync_single_for_cpu(ia
->ri_device
,
1355 rdmab_addr(rep
->rr_rdmabuf
),
1356 rdmab_length(rep
->rr_rdmabuf
),
1359 rc
= ib_post_recv(ia
->ri_id
->qp
, &recv_wr
, &recv_wr_fail
);
1362 dprintk("RPC: %s: ib_post_recv returned %i\n", __func__
,
1367 /* How many chunk list items fit within our inline buffers?
1370 rpcrdma_max_segments(struct rpcrdma_xprt
*r_xprt
)
1372 struct rpcrdma_create_data_internal
*cdata
= &r_xprt
->rx_data
;
1373 int bytes
, segments
;
1375 bytes
= min_t(unsigned int, cdata
->inline_wsize
, cdata
->inline_rsize
);
1376 bytes
-= RPCRDMA_HDRLEN_MIN
;
1377 if (bytes
< sizeof(struct rpcrdma_segment
) * 2) {
1378 pr_warn("RPC: %s: inline threshold too small\n",
1383 segments
= 1 << (fls(bytes
/ sizeof(struct rpcrdma_segment
)) - 1);
1384 dprintk("RPC: %s: max chunk list size = %d segments\n",
1385 __func__
, segments
);