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/pci.h> /* for Tavor hack below */
52 #include "xprt_rdma.h"
59 # define RPCDBG_FACILITY RPCDBG_TRANS
67 * handle replies in tasklet context, using a single, global list
68 * rdma tasklet function -- just turn around and call the func
69 * for all replies on the list
72 static DEFINE_SPINLOCK(rpcrdma_tk_lock_g
);
73 static LIST_HEAD(rpcrdma_tasklets_g
);
76 rpcrdma_run_tasklet(unsigned long data
)
78 struct rpcrdma_rep
*rep
;
79 void (*func
)(struct rpcrdma_rep
*);
83 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
84 while (!list_empty(&rpcrdma_tasklets_g
)) {
85 rep
= list_entry(rpcrdma_tasklets_g
.next
,
86 struct rpcrdma_rep
, rr_list
);
87 list_del(&rep
->rr_list
);
90 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
95 rpcrdma_recv_buffer_put(rep
);
97 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
99 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
102 static DECLARE_TASKLET(rpcrdma_tasklet_g
, rpcrdma_run_tasklet
, 0UL);
105 rpcrdma_schedule_tasklet(struct rpcrdma_rep
*rep
)
109 spin_lock_irqsave(&rpcrdma_tk_lock_g
, flags
);
110 list_add_tail(&rep
->rr_list
, &rpcrdma_tasklets_g
);
111 spin_unlock_irqrestore(&rpcrdma_tk_lock_g
, flags
);
112 tasklet_schedule(&rpcrdma_tasklet_g
);
116 rpcrdma_qp_async_error_upcall(struct ib_event
*event
, void *context
)
118 struct rpcrdma_ep
*ep
= context
;
120 dprintk("RPC: %s: QP error %X on device %s ep %p\n",
121 __func__
, event
->event
, event
->device
->name
, context
);
122 if (ep
->rep_connected
== 1) {
123 ep
->rep_connected
= -EIO
;
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 dprintk("RPC: %s: CQ error %X on device %s ep %p\n",
135 __func__
, event
->event
, event
->device
->name
, context
);
136 if (ep
->rep_connected
== 1) {
137 ep
->rep_connected
= -EIO
;
139 wake_up_all(&ep
->rep_connect_wait
);
144 void rpcrdma_event_process(struct ib_wc
*wc
)
146 struct rpcrdma_rep
*rep
=
147 (struct rpcrdma_rep
*)(unsigned long) wc
->wr_id
;
149 dprintk("RPC: %s: event rep %p status %X opcode %X length %u\n",
150 __func__
, rep
, wc
->status
, wc
->opcode
, wc
->byte_len
);
152 if (!rep
) /* send or bind completion that we don't care about */
155 if (IB_WC_SUCCESS
!= wc
->status
) {
156 dprintk("RPC: %s: %s WC status %X, connection lost\n",
157 __func__
, (wc
->opcode
& IB_WC_RECV
) ? "recv" : "send",
160 rpcrdma_schedule_tasklet(rep
);
164 switch (wc
->opcode
) {
166 rep
->rr_len
= wc
->byte_len
;
167 ib_dma_sync_single_for_cpu(
168 rdmab_to_ia(rep
->rr_buffer
)->ri_id
->device
,
169 rep
->rr_iov
.addr
, rep
->rr_len
, DMA_FROM_DEVICE
);
170 /* Keep (only) the most recent credits, after check validity */
171 if (rep
->rr_len
>= 16) {
172 struct rpcrdma_msg
*p
=
173 (struct rpcrdma_msg
*) rep
->rr_base
;
174 unsigned int credits
= ntohl(p
->rm_credit
);
176 dprintk("RPC: %s: server"
177 " dropped credits to 0!\n", __func__
);
180 } else if (credits
> rep
->rr_buffer
->rb_max_requests
) {
181 dprintk("RPC: %s: server"
182 " over-crediting: %d (%d)\n",
184 rep
->rr_buffer
->rb_max_requests
);
185 credits
= rep
->rr_buffer
->rb_max_requests
;
187 atomic_set(&rep
->rr_buffer
->rb_credits
, credits
);
191 rpcrdma_schedule_tasklet(rep
);
194 dprintk("RPC: %s: unexpected WC event %X\n",
195 __func__
, wc
->opcode
);
201 rpcrdma_cq_poll(struct ib_cq
*cq
)
207 rc
= ib_poll_cq(cq
, 1, &wc
);
209 dprintk("RPC: %s: ib_poll_cq failed %i\n",
216 rpcrdma_event_process(&wc
);
223 * rpcrdma_cq_event_upcall
225 * This upcall handles recv, send, bind and unbind events.
226 * It is reentrant but processes single events in order to maintain
227 * ordering of receives to keep server credits.
229 * It is the responsibility of the scheduled tasklet to return
230 * recv buffers to the pool. NOTE: this affects synchronization of
231 * connection shutdown. That is, the structures required for
232 * the completion of the reply handler must remain intact until
233 * all memory has been reclaimed.
235 * Note that send events are suppressed and do not result in an upcall.
238 rpcrdma_cq_event_upcall(struct ib_cq
*cq
, void *context
)
242 rc
= rpcrdma_cq_poll(cq
);
246 rc
= ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
248 dprintk("RPC: %s: ib_req_notify_cq failed %i\n",
257 static const char * const conn
[] = {
274 rpcrdma_conn_upcall(struct rdma_cm_id
*id
, struct rdma_cm_event
*event
)
276 struct rpcrdma_xprt
*xprt
= id
->context
;
277 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
278 struct rpcrdma_ep
*ep
= &xprt
->rx_ep
;
279 struct sockaddr_in
*addr
= (struct sockaddr_in
*) &ep
->rep_remote_addr
;
280 struct ib_qp_attr attr
;
281 struct ib_qp_init_attr iattr
;
284 switch (event
->event
) {
285 case RDMA_CM_EVENT_ADDR_RESOLVED
:
286 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
288 complete(&ia
->ri_done
);
290 case RDMA_CM_EVENT_ADDR_ERROR
:
291 ia
->ri_async_rc
= -EHOSTUNREACH
;
292 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
294 complete(&ia
->ri_done
);
296 case RDMA_CM_EVENT_ROUTE_ERROR
:
297 ia
->ri_async_rc
= -ENETUNREACH
;
298 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
300 complete(&ia
->ri_done
);
302 case RDMA_CM_EVENT_ESTABLISHED
:
304 ib_query_qp(ia
->ri_id
->qp
, &attr
,
305 IB_QP_MAX_QP_RD_ATOMIC
| IB_QP_MAX_DEST_RD_ATOMIC
,
307 dprintk("RPC: %s: %d responder resources"
309 __func__
, attr
.max_dest_rd_atomic
, attr
.max_rd_atomic
);
311 case RDMA_CM_EVENT_CONNECT_ERROR
:
312 connstate
= -ENOTCONN
;
314 case RDMA_CM_EVENT_UNREACHABLE
:
315 connstate
= -ENETDOWN
;
317 case RDMA_CM_EVENT_REJECTED
:
318 connstate
= -ECONNREFUSED
;
320 case RDMA_CM_EVENT_DISCONNECTED
:
321 connstate
= -ECONNABORTED
;
323 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
326 dprintk("RPC: %s: %s: %pI4:%u (ep 0x%p event 0x%x)\n",
328 (event
->event
<= 11) ? conn
[event
->event
] :
329 "unknown connection error",
330 &addr
->sin_addr
.s_addr
,
331 ntohs(addr
->sin_port
),
333 atomic_set(&rpcx_to_rdmax(ep
->rep_xprt
)->rx_buf
.rb_credits
, 1);
334 dprintk("RPC: %s: %sconnected\n",
335 __func__
, connstate
> 0 ? "" : "dis");
336 ep
->rep_connected
= connstate
;
338 wake_up_all(&ep
->rep_connect_wait
);
341 dprintk("RPC: %s: unexpected CM event %d\n",
342 __func__
, event
->event
);
347 if (connstate
== 1) {
348 int ird
= attr
.max_dest_rd_atomic
;
349 int tird
= ep
->rep_remote_cma
.responder_resources
;
350 printk(KERN_INFO
"rpcrdma: connection to %pI4:%u "
351 "on %s, memreg %d slots %d ird %d%s\n",
352 &addr
->sin_addr
.s_addr
,
353 ntohs(addr
->sin_port
),
354 ia
->ri_id
->device
->name
,
355 ia
->ri_memreg_strategy
,
356 xprt
->rx_buf
.rb_max_requests
,
357 ird
, ird
< 4 && ird
< tird
/ 2 ? " (low!)" : "");
358 } else if (connstate
< 0) {
359 printk(KERN_INFO
"rpcrdma: connection to %pI4:%u closed (%d)\n",
360 &addr
->sin_addr
.s_addr
,
361 ntohs(addr
->sin_port
),
369 static struct rdma_cm_id
*
370 rpcrdma_create_id(struct rpcrdma_xprt
*xprt
,
371 struct rpcrdma_ia
*ia
, struct sockaddr
*addr
)
373 struct rdma_cm_id
*id
;
376 init_completion(&ia
->ri_done
);
378 id
= rdma_create_id(rpcrdma_conn_upcall
, xprt
, RDMA_PS_TCP
);
381 dprintk("RPC: %s: rdma_create_id() failed %i\n",
386 ia
->ri_async_rc
= -ETIMEDOUT
;
387 rc
= rdma_resolve_addr(id
, NULL
, addr
, RDMA_RESOLVE_TIMEOUT
);
389 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
393 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
394 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
395 rc
= ia
->ri_async_rc
;
399 ia
->ri_async_rc
= -ETIMEDOUT
;
400 rc
= rdma_resolve_route(id
, RDMA_RESOLVE_TIMEOUT
);
402 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
406 wait_for_completion_interruptible_timeout(&ia
->ri_done
,
407 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT
) + 1);
408 rc
= ia
->ri_async_rc
;
420 * Drain any cq, prior to teardown.
423 rpcrdma_clean_cq(struct ib_cq
*cq
)
428 while (1 == ib_poll_cq(cq
, 1, &wc
))
432 dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
433 __func__
, count
, wc
.opcode
);
437 * Exported functions.
441 * Open and initialize an Interface Adapter.
442 * o initializes fields of struct rpcrdma_ia, including
443 * interface and provider attributes and protection zone.
446 rpcrdma_ia_open(struct rpcrdma_xprt
*xprt
, struct sockaddr
*addr
, int memreg
)
449 struct ib_device_attr devattr
;
450 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
452 ia
->ri_id
= rpcrdma_create_id(xprt
, ia
, addr
);
453 if (IS_ERR(ia
->ri_id
)) {
454 rc
= PTR_ERR(ia
->ri_id
);
458 ia
->ri_pd
= ib_alloc_pd(ia
->ri_id
->device
);
459 if (IS_ERR(ia
->ri_pd
)) {
460 rc
= PTR_ERR(ia
->ri_pd
);
461 dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
467 * Query the device to determine if the requested memory
468 * registration strategy is supported. If it isn't, set the
469 * strategy to a globally supported model.
471 rc
= ib_query_device(ia
->ri_id
->device
, &devattr
);
473 dprintk("RPC: %s: ib_query_device failed %d\n",
478 if (devattr
.device_cap_flags
& IB_DEVICE_LOCAL_DMA_LKEY
) {
479 ia
->ri_have_dma_lkey
= 1;
480 ia
->ri_dma_lkey
= ia
->ri_id
->device
->local_dma_lkey
;
484 case RPCRDMA_MEMWINDOWS
:
485 case RPCRDMA_MEMWINDOWS_ASYNC
:
486 if (!(devattr
.device_cap_flags
& IB_DEVICE_MEM_WINDOW
)) {
487 dprintk("RPC: %s: MEMWINDOWS registration "
488 "specified but not supported by adapter, "
489 "using slower RPCRDMA_REGISTER\n",
491 memreg
= RPCRDMA_REGISTER
;
494 case RPCRDMA_MTHCAFMR
:
495 if (!ia
->ri_id
->device
->alloc_fmr
) {
496 #if RPCRDMA_PERSISTENT_REGISTRATION
497 dprintk("RPC: %s: MTHCAFMR registration "
498 "specified but not supported by adapter, "
499 "using riskier RPCRDMA_ALLPHYSICAL\n",
501 memreg
= RPCRDMA_ALLPHYSICAL
;
503 dprintk("RPC: %s: MTHCAFMR registration "
504 "specified but not supported by adapter, "
505 "using slower RPCRDMA_REGISTER\n",
507 memreg
= RPCRDMA_REGISTER
;
512 /* Requires both frmr reg and local dma lkey */
513 if ((devattr
.device_cap_flags
&
514 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) !=
515 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) {
516 #if RPCRDMA_PERSISTENT_REGISTRATION
517 dprintk("RPC: %s: FRMR registration "
518 "specified but not supported by adapter, "
519 "using riskier RPCRDMA_ALLPHYSICAL\n",
521 memreg
= RPCRDMA_ALLPHYSICAL
;
523 dprintk("RPC: %s: FRMR registration "
524 "specified but not supported by adapter, "
525 "using slower RPCRDMA_REGISTER\n",
527 memreg
= RPCRDMA_REGISTER
;
534 * Optionally obtain an underlying physical identity mapping in
535 * order to do a memory window-based bind. This base registration
536 * is protected from remote access - that is enabled only by binding
537 * for the specific bytes targeted during each RPC operation, and
538 * revoked after the corresponding completion similar to a storage
542 case RPCRDMA_BOUNCEBUFFERS
:
543 case RPCRDMA_REGISTER
:
546 #if RPCRDMA_PERSISTENT_REGISTRATION
547 case RPCRDMA_ALLPHYSICAL
:
548 mem_priv
= IB_ACCESS_LOCAL_WRITE
|
549 IB_ACCESS_REMOTE_WRITE
|
550 IB_ACCESS_REMOTE_READ
;
553 case RPCRDMA_MEMWINDOWS_ASYNC
:
554 case RPCRDMA_MEMWINDOWS
:
555 mem_priv
= IB_ACCESS_LOCAL_WRITE
|
558 case RPCRDMA_MTHCAFMR
:
559 if (ia
->ri_have_dma_lkey
)
561 mem_priv
= IB_ACCESS_LOCAL_WRITE
;
563 ia
->ri_bind_mem
= ib_get_dma_mr(ia
->ri_pd
, mem_priv
);
564 if (IS_ERR(ia
->ri_bind_mem
)) {
565 printk(KERN_ALERT
"%s: ib_get_dma_mr for "
566 "phys register failed with %lX\n\t"
567 "Will continue with degraded performance\n",
568 __func__
, PTR_ERR(ia
->ri_bind_mem
));
569 memreg
= RPCRDMA_REGISTER
;
570 ia
->ri_bind_mem
= NULL
;
574 printk(KERN_ERR
"%s: invalid memory registration mode %d\n",
579 dprintk("RPC: %s: memory registration strategy is %d\n",
582 /* Else will do memory reg/dereg for each chunk */
583 ia
->ri_memreg_strategy
= memreg
;
587 rdma_destroy_id(ia
->ri_id
);
594 * Clean up/close an IA.
595 * o if event handles and PD have been initialized, free them.
599 rpcrdma_ia_close(struct rpcrdma_ia
*ia
)
603 dprintk("RPC: %s: entering\n", __func__
);
604 if (ia
->ri_bind_mem
!= NULL
) {
605 rc
= ib_dereg_mr(ia
->ri_bind_mem
);
606 dprintk("RPC: %s: ib_dereg_mr returned %i\n",
609 if (ia
->ri_id
!= NULL
&& !IS_ERR(ia
->ri_id
)) {
611 rdma_destroy_qp(ia
->ri_id
);
612 rdma_destroy_id(ia
->ri_id
);
615 if (ia
->ri_pd
!= NULL
&& !IS_ERR(ia
->ri_pd
)) {
616 rc
= ib_dealloc_pd(ia
->ri_pd
);
617 dprintk("RPC: %s: ib_dealloc_pd returned %i\n",
623 * Create unconnected endpoint.
626 rpcrdma_ep_create(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
,
627 struct rpcrdma_create_data_internal
*cdata
)
629 struct ib_device_attr devattr
;
632 rc
= ib_query_device(ia
->ri_id
->device
, &devattr
);
634 dprintk("RPC: %s: ib_query_device failed %d\n",
639 /* check provider's send/recv wr limits */
640 if (cdata
->max_requests
> devattr
.max_qp_wr
)
641 cdata
->max_requests
= devattr
.max_qp_wr
;
643 ep
->rep_attr
.event_handler
= rpcrdma_qp_async_error_upcall
;
644 ep
->rep_attr
.qp_context
= ep
;
645 /* send_cq and recv_cq initialized below */
646 ep
->rep_attr
.srq
= NULL
;
647 ep
->rep_attr
.cap
.max_send_wr
= cdata
->max_requests
;
648 switch (ia
->ri_memreg_strategy
) {
650 /* Add room for frmr register and invalidate WRs */
651 ep
->rep_attr
.cap
.max_send_wr
*= 3;
652 if (ep
->rep_attr
.cap
.max_send_wr
> devattr
.max_qp_wr
)
655 case RPCRDMA_MEMWINDOWS_ASYNC
:
656 case RPCRDMA_MEMWINDOWS
:
657 /* Add room for mw_binds+unbinds - overkill! */
658 ep
->rep_attr
.cap
.max_send_wr
++;
659 ep
->rep_attr
.cap
.max_send_wr
*= (2 * RPCRDMA_MAX_SEGS
);
660 if (ep
->rep_attr
.cap
.max_send_wr
> devattr
.max_qp_wr
)
666 ep
->rep_attr
.cap
.max_recv_wr
= cdata
->max_requests
;
667 ep
->rep_attr
.cap
.max_send_sge
= (cdata
->padding
? 4 : 2);
668 ep
->rep_attr
.cap
.max_recv_sge
= 1;
669 ep
->rep_attr
.cap
.max_inline_data
= 0;
670 ep
->rep_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
671 ep
->rep_attr
.qp_type
= IB_QPT_RC
;
672 ep
->rep_attr
.port_num
= ~0;
674 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
675 "iovs: send %d recv %d\n",
677 ep
->rep_attr
.cap
.max_send_wr
,
678 ep
->rep_attr
.cap
.max_recv_wr
,
679 ep
->rep_attr
.cap
.max_send_sge
,
680 ep
->rep_attr
.cap
.max_recv_sge
);
682 /* set trigger for requesting send completion */
683 ep
->rep_cqinit
= ep
->rep_attr
.cap
.max_send_wr
/2 /* - 1*/;
684 switch (ia
->ri_memreg_strategy
) {
685 case RPCRDMA_MEMWINDOWS_ASYNC
:
686 case RPCRDMA_MEMWINDOWS
:
687 ep
->rep_cqinit
-= RPCRDMA_MAX_SEGS
;
692 if (ep
->rep_cqinit
<= 2)
696 init_waitqueue_head(&ep
->rep_connect_wait
);
699 * Create a single cq for receive dto and mw_bind (only ever
700 * care about unbind, really). Send completions are suppressed.
701 * Use single threaded tasklet upcalls to maintain ordering.
703 ep
->rep_cq
= ib_create_cq(ia
->ri_id
->device
, rpcrdma_cq_event_upcall
,
704 rpcrdma_cq_async_error_upcall
, NULL
,
705 ep
->rep_attr
.cap
.max_recv_wr
+
706 ep
->rep_attr
.cap
.max_send_wr
+ 1, 0);
707 if (IS_ERR(ep
->rep_cq
)) {
708 rc
= PTR_ERR(ep
->rep_cq
);
709 dprintk("RPC: %s: ib_create_cq failed: %i\n",
714 rc
= ib_req_notify_cq(ep
->rep_cq
, IB_CQ_NEXT_COMP
);
716 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
721 ep
->rep_attr
.send_cq
= ep
->rep_cq
;
722 ep
->rep_attr
.recv_cq
= ep
->rep_cq
;
724 /* Initialize cma parameters */
726 /* RPC/RDMA does not use private data */
727 ep
->rep_remote_cma
.private_data
= NULL
;
728 ep
->rep_remote_cma
.private_data_len
= 0;
730 /* Client offers RDMA Read but does not initiate */
731 ep
->rep_remote_cma
.initiator_depth
= 0;
732 if (ia
->ri_memreg_strategy
== RPCRDMA_BOUNCEBUFFERS
)
733 ep
->rep_remote_cma
.responder_resources
= 0;
734 else if (devattr
.max_qp_rd_atom
> 32) /* arbitrary but <= 255 */
735 ep
->rep_remote_cma
.responder_resources
= 32;
737 ep
->rep_remote_cma
.responder_resources
= devattr
.max_qp_rd_atom
;
739 ep
->rep_remote_cma
.retry_count
= 7;
740 ep
->rep_remote_cma
.flow_control
= 0;
741 ep
->rep_remote_cma
.rnr_retry_count
= 0;
746 err
= ib_destroy_cq(ep
->rep_cq
);
748 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
757 * Disconnect and destroy endpoint. After this, the only
758 * valid operations on the ep are to free it (if dynamically
759 * allocated) or re-create it.
761 * The caller's error handling must be sure to not leak the endpoint
762 * if this function fails.
765 rpcrdma_ep_destroy(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
769 dprintk("RPC: %s: entering, connected is %d\n",
770 __func__
, ep
->rep_connected
);
773 rc
= rpcrdma_ep_disconnect(ep
, ia
);
775 dprintk("RPC: %s: rpcrdma_ep_disconnect"
776 " returned %i\n", __func__
, rc
);
777 rdma_destroy_qp(ia
->ri_id
);
778 ia
->ri_id
->qp
= NULL
;
781 /* padding - could be done in rpcrdma_buffer_destroy... */
782 if (ep
->rep_pad_mr
) {
783 rpcrdma_deregister_internal(ia
, ep
->rep_pad_mr
, &ep
->rep_pad
);
784 ep
->rep_pad_mr
= NULL
;
787 rpcrdma_clean_cq(ep
->rep_cq
);
788 rc
= ib_destroy_cq(ep
->rep_cq
);
790 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
797 * Connect unconnected endpoint.
800 rpcrdma_ep_connect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
802 struct rdma_cm_id
*id
;
806 if (ep
->rep_connected
!= 0) {
807 struct rpcrdma_xprt
*xprt
;
809 rc
= rpcrdma_ep_disconnect(ep
, ia
);
810 if (rc
&& rc
!= -ENOTCONN
)
811 dprintk("RPC: %s: rpcrdma_ep_disconnect"
812 " status %i\n", __func__
, rc
);
813 rpcrdma_clean_cq(ep
->rep_cq
);
815 xprt
= container_of(ia
, struct rpcrdma_xprt
, rx_ia
);
816 id
= rpcrdma_create_id(xprt
, ia
,
817 (struct sockaddr
*)&xprt
->rx_data
.addr
);
822 /* TEMP TEMP TEMP - fail if new device:
823 * Deregister/remarshal *all* requests!
824 * Close and recreate adapter, pd, etc!
825 * Re-determine all attributes still sane!
826 * More stuff I haven't thought of!
829 if (ia
->ri_id
->device
!= id
->device
) {
830 printk("RPC: %s: can't reconnect on "
831 "different device!\n", __func__
);
837 rdma_destroy_qp(ia
->ri_id
);
838 rdma_destroy_id(ia
->ri_id
);
842 rc
= rdma_create_qp(ia
->ri_id
, ia
->ri_pd
, &ep
->rep_attr
);
844 dprintk("RPC: %s: rdma_create_qp failed %i\n",
849 /* XXX Tavor device performs badly with 2K MTU! */
850 if (strnicmp(ia
->ri_id
->device
->dma_device
->bus
->name
, "pci", 3) == 0) {
851 struct pci_dev
*pcid
= to_pci_dev(ia
->ri_id
->device
->dma_device
);
852 if (pcid
->device
== PCI_DEVICE_ID_MELLANOX_TAVOR
&&
853 (pcid
->vendor
== PCI_VENDOR_ID_MELLANOX
||
854 pcid
->vendor
== PCI_VENDOR_ID_TOPSPIN
)) {
855 struct ib_qp_attr attr
= {
856 .path_mtu
= IB_MTU_1024
858 rc
= ib_modify_qp(ia
->ri_id
->qp
, &attr
, IB_QP_PATH_MTU
);
862 ep
->rep_connected
= 0;
864 rc
= rdma_connect(ia
->ri_id
, &ep
->rep_remote_cma
);
866 dprintk("RPC: %s: rdma_connect() failed with %i\n",
871 wait_event_interruptible(ep
->rep_connect_wait
, ep
->rep_connected
!= 0);
874 * Check state. A non-peer reject indicates no listener
875 * (ECONNREFUSED), which may be a transient state. All
876 * others indicate a transport condition which has already
877 * undergone a best-effort.
879 if (ep
->rep_connected
== -ECONNREFUSED
880 && ++retry_count
<= RDMA_CONNECT_RETRY_MAX
) {
881 dprintk("RPC: %s: non-peer_reject, retry\n", __func__
);
884 if (ep
->rep_connected
<= 0) {
885 /* Sometimes, the only way to reliably connect to remote
886 * CMs is to use same nonzero values for ORD and IRD. */
887 if (retry_count
++ <= RDMA_CONNECT_RETRY_MAX
+ 1 &&
888 (ep
->rep_remote_cma
.responder_resources
== 0 ||
889 ep
->rep_remote_cma
.initiator_depth
!=
890 ep
->rep_remote_cma
.responder_resources
)) {
891 if (ep
->rep_remote_cma
.responder_resources
== 0)
892 ep
->rep_remote_cma
.responder_resources
= 1;
893 ep
->rep_remote_cma
.initiator_depth
=
894 ep
->rep_remote_cma
.responder_resources
;
897 rc
= ep
->rep_connected
;
899 dprintk("RPC: %s: connected\n", __func__
);
904 ep
->rep_connected
= rc
;
909 * rpcrdma_ep_disconnect
911 * This is separate from destroy to facilitate the ability
912 * to reconnect without recreating the endpoint.
914 * This call is not reentrant, and must not be made in parallel
915 * on the same endpoint.
918 rpcrdma_ep_disconnect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
922 rpcrdma_clean_cq(ep
->rep_cq
);
923 rc
= rdma_disconnect(ia
->ri_id
);
925 /* returns without wait if not connected */
926 wait_event_interruptible(ep
->rep_connect_wait
,
927 ep
->rep_connected
!= 1);
928 dprintk("RPC: %s: after wait, %sconnected\n", __func__
,
929 (ep
->rep_connected
== 1) ? "still " : "dis");
931 dprintk("RPC: %s: rdma_disconnect %i\n", __func__
, rc
);
932 ep
->rep_connected
= rc
;
938 * Initialize buffer memory
941 rpcrdma_buffer_create(struct rpcrdma_buffer
*buf
, struct rpcrdma_ep
*ep
,
942 struct rpcrdma_ia
*ia
, struct rpcrdma_create_data_internal
*cdata
)
947 struct rpcrdma_mw
*r
;
949 buf
->rb_max_requests
= cdata
->max_requests
;
950 spin_lock_init(&buf
->rb_lock
);
951 atomic_set(&buf
->rb_credits
, 1);
954 * 1. arrays for send and recv pointers
955 * 2. arrays of struct rpcrdma_req to fill in pointers
956 * 3. array of struct rpcrdma_rep for replies
958 * 5. mw's, fmr's or frmr's, if any
959 * Send/recv buffers in req/rep need to be registered
962 len
= buf
->rb_max_requests
*
963 (sizeof(struct rpcrdma_req
*) + sizeof(struct rpcrdma_rep
*));
964 len
+= cdata
->padding
;
965 switch (ia
->ri_memreg_strategy
) {
967 len
+= buf
->rb_max_requests
* RPCRDMA_MAX_SEGS
*
968 sizeof(struct rpcrdma_mw
);
970 case RPCRDMA_MTHCAFMR
:
971 /* TBD we are perhaps overallocating here */
972 len
+= (buf
->rb_max_requests
+ 1) * RPCRDMA_MAX_SEGS
*
973 sizeof(struct rpcrdma_mw
);
975 case RPCRDMA_MEMWINDOWS_ASYNC
:
976 case RPCRDMA_MEMWINDOWS
:
977 len
+= (buf
->rb_max_requests
+ 1) * RPCRDMA_MAX_SEGS
*
978 sizeof(struct rpcrdma_mw
);
984 /* allocate 1, 4 and 5 in one shot */
985 p
= kzalloc(len
, GFP_KERNEL
);
987 dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
992 buf
->rb_pool
= p
; /* for freeing it later */
994 buf
->rb_send_bufs
= (struct rpcrdma_req
**) p
;
995 p
= (char *) &buf
->rb_send_bufs
[buf
->rb_max_requests
];
996 buf
->rb_recv_bufs
= (struct rpcrdma_rep
**) p
;
997 p
= (char *) &buf
->rb_recv_bufs
[buf
->rb_max_requests
];
1000 * Register the zeroed pad buffer, if any.
1002 if (cdata
->padding
) {
1003 rc
= rpcrdma_register_internal(ia
, p
, cdata
->padding
,
1004 &ep
->rep_pad_mr
, &ep
->rep_pad
);
1008 p
+= cdata
->padding
;
1011 * Allocate the fmr's, or mw's for mw_bind chunk registration.
1012 * We "cycle" the mw's in order to minimize rkey reuse,
1013 * and also reduce unbind-to-bind collision.
1015 INIT_LIST_HEAD(&buf
->rb_mws
);
1016 r
= (struct rpcrdma_mw
*)p
;
1017 switch (ia
->ri_memreg_strategy
) {
1019 for (i
= buf
->rb_max_requests
* RPCRDMA_MAX_SEGS
; i
; i
--) {
1020 r
->r
.frmr
.fr_mr
= ib_alloc_fast_reg_mr(ia
->ri_pd
,
1022 if (IS_ERR(r
->r
.frmr
.fr_mr
)) {
1023 rc
= PTR_ERR(r
->r
.frmr
.fr_mr
);
1024 dprintk("RPC: %s: ib_alloc_fast_reg_mr"
1025 " failed %i\n", __func__
, rc
);
1029 ib_alloc_fast_reg_page_list(ia
->ri_id
->device
,
1031 if (IS_ERR(r
->r
.frmr
.fr_pgl
)) {
1032 rc
= PTR_ERR(r
->r
.frmr
.fr_pgl
);
1034 "ib_alloc_fast_reg_page_list "
1035 "failed %i\n", __func__
, rc
);
1038 list_add(&r
->mw_list
, &buf
->rb_mws
);
1042 case RPCRDMA_MTHCAFMR
:
1043 /* TBD we are perhaps overallocating here */
1044 for (i
= (buf
->rb_max_requests
+1) * RPCRDMA_MAX_SEGS
; i
; i
--) {
1045 static struct ib_fmr_attr fa
=
1046 { RPCRDMA_MAX_DATA_SEGS
, 1, PAGE_SHIFT
};
1047 r
->r
.fmr
= ib_alloc_fmr(ia
->ri_pd
,
1048 IB_ACCESS_REMOTE_WRITE
| IB_ACCESS_REMOTE_READ
,
1050 if (IS_ERR(r
->r
.fmr
)) {
1051 rc
= PTR_ERR(r
->r
.fmr
);
1052 dprintk("RPC: %s: ib_alloc_fmr"
1053 " failed %i\n", __func__
, rc
);
1056 list_add(&r
->mw_list
, &buf
->rb_mws
);
1060 case RPCRDMA_MEMWINDOWS_ASYNC
:
1061 case RPCRDMA_MEMWINDOWS
:
1062 /* Allocate one extra request's worth, for full cycling */
1063 for (i
= (buf
->rb_max_requests
+1) * RPCRDMA_MAX_SEGS
; i
; i
--) {
1064 r
->r
.mw
= ib_alloc_mw(ia
->ri_pd
);
1065 if (IS_ERR(r
->r
.mw
)) {
1066 rc
= PTR_ERR(r
->r
.mw
);
1067 dprintk("RPC: %s: ib_alloc_mw"
1068 " failed %i\n", __func__
, rc
);
1071 list_add(&r
->mw_list
, &buf
->rb_mws
);
1080 * Allocate/init the request/reply buffers. Doing this
1081 * using kmalloc for now -- one for each buf.
1083 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1084 struct rpcrdma_req
*req
;
1085 struct rpcrdma_rep
*rep
;
1087 len
= cdata
->inline_wsize
+ sizeof(struct rpcrdma_req
);
1088 /* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */
1089 /* Typical ~2400b, so rounding up saves work later */
1092 req
= kmalloc(len
, GFP_KERNEL
);
1094 dprintk("RPC: %s: request buffer %d alloc"
1095 " failed\n", __func__
, i
);
1099 memset(req
, 0, sizeof(struct rpcrdma_req
));
1100 buf
->rb_send_bufs
[i
] = req
;
1101 buf
->rb_send_bufs
[i
]->rl_buffer
= buf
;
1103 rc
= rpcrdma_register_internal(ia
, req
->rl_base
,
1104 len
- offsetof(struct rpcrdma_req
, rl_base
),
1105 &buf
->rb_send_bufs
[i
]->rl_handle
,
1106 &buf
->rb_send_bufs
[i
]->rl_iov
);
1110 buf
->rb_send_bufs
[i
]->rl_size
= len
-sizeof(struct rpcrdma_req
);
1112 len
= cdata
->inline_rsize
+ sizeof(struct rpcrdma_rep
);
1113 rep
= kmalloc(len
, GFP_KERNEL
);
1115 dprintk("RPC: %s: reply buffer %d alloc failed\n",
1120 memset(rep
, 0, sizeof(struct rpcrdma_rep
));
1121 buf
->rb_recv_bufs
[i
] = rep
;
1122 buf
->rb_recv_bufs
[i
]->rr_buffer
= buf
;
1123 init_waitqueue_head(&rep
->rr_unbind
);
1125 rc
= rpcrdma_register_internal(ia
, rep
->rr_base
,
1126 len
- offsetof(struct rpcrdma_rep
, rr_base
),
1127 &buf
->rb_recv_bufs
[i
]->rr_handle
,
1128 &buf
->rb_recv_bufs
[i
]->rr_iov
);
1133 dprintk("RPC: %s: max_requests %d\n",
1134 __func__
, buf
->rb_max_requests
);
1138 rpcrdma_buffer_destroy(buf
);
1143 * Unregister and destroy buffer memory. Need to deal with
1144 * partial initialization, so it's callable from failed create.
1145 * Must be called before destroying endpoint, as registrations
1149 rpcrdma_buffer_destroy(struct rpcrdma_buffer
*buf
)
1152 struct rpcrdma_ia
*ia
= rdmab_to_ia(buf
);
1153 struct rpcrdma_mw
*r
;
1155 /* clean up in reverse order from create
1156 * 1. recv mr memory (mr free, then kfree)
1157 * 1a. bind mw memory
1158 * 2. send mr memory (mr free, then kfree)
1159 * 3. padding (if any) [moved to rpcrdma_ep_destroy]
1162 dprintk("RPC: %s: entering\n", __func__
);
1164 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1165 if (buf
->rb_recv_bufs
&& buf
->rb_recv_bufs
[i
]) {
1166 rpcrdma_deregister_internal(ia
,
1167 buf
->rb_recv_bufs
[i
]->rr_handle
,
1168 &buf
->rb_recv_bufs
[i
]->rr_iov
);
1169 kfree(buf
->rb_recv_bufs
[i
]);
1171 if (buf
->rb_send_bufs
&& buf
->rb_send_bufs
[i
]) {
1172 while (!list_empty(&buf
->rb_mws
)) {
1173 r
= list_entry(buf
->rb_mws
.next
,
1174 struct rpcrdma_mw
, mw_list
);
1175 list_del(&r
->mw_list
);
1176 switch (ia
->ri_memreg_strategy
) {
1178 rc
= ib_dereg_mr(r
->r
.frmr
.fr_mr
);
1184 ib_free_fast_reg_page_list(r
->r
.frmr
.fr_pgl
);
1186 case RPCRDMA_MTHCAFMR
:
1187 rc
= ib_dealloc_fmr(r
->r
.fmr
);
1194 case RPCRDMA_MEMWINDOWS_ASYNC
:
1195 case RPCRDMA_MEMWINDOWS
:
1196 rc
= ib_dealloc_mw(r
->r
.mw
);
1207 rpcrdma_deregister_internal(ia
,
1208 buf
->rb_send_bufs
[i
]->rl_handle
,
1209 &buf
->rb_send_bufs
[i
]->rl_iov
);
1210 kfree(buf
->rb_send_bufs
[i
]);
1214 kfree(buf
->rb_pool
);
1218 * Get a set of request/reply buffers.
1220 * Reply buffer (if needed) is attached to send buffer upon return.
1222 * rb_send_index and rb_recv_index MUST always be pointing to the
1223 * *next* available buffer (non-NULL). They are incremented after
1224 * removing buffers, and decremented *before* returning them.
1226 struct rpcrdma_req
*
1227 rpcrdma_buffer_get(struct rpcrdma_buffer
*buffers
)
1229 struct rpcrdma_req
*req
;
1230 unsigned long flags
;
1232 struct rpcrdma_mw
*r
;
1234 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1235 if (buffers
->rb_send_index
== buffers
->rb_max_requests
) {
1236 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1237 dprintk("RPC: %s: out of request buffers\n", __func__
);
1238 return ((struct rpcrdma_req
*)NULL
);
1241 req
= buffers
->rb_send_bufs
[buffers
->rb_send_index
];
1242 if (buffers
->rb_send_index
< buffers
->rb_recv_index
) {
1243 dprintk("RPC: %s: %d extra receives outstanding (ok)\n",
1245 buffers
->rb_recv_index
- buffers
->rb_send_index
);
1246 req
->rl_reply
= NULL
;
1248 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1249 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1251 buffers
->rb_send_bufs
[buffers
->rb_send_index
++] = NULL
;
1252 if (!list_empty(&buffers
->rb_mws
)) {
1253 i
= RPCRDMA_MAX_SEGS
- 1;
1255 r
= list_entry(buffers
->rb_mws
.next
,
1256 struct rpcrdma_mw
, mw_list
);
1257 list_del(&r
->mw_list
);
1258 req
->rl_segments
[i
].mr_chunk
.rl_mw
= r
;
1261 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1266 * Put request/reply buffers back into pool.
1267 * Pre-decrement counter/array index.
1270 rpcrdma_buffer_put(struct rpcrdma_req
*req
)
1272 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1273 struct rpcrdma_ia
*ia
= rdmab_to_ia(buffers
);
1275 unsigned long flags
;
1277 BUG_ON(req
->rl_nchunks
!= 0);
1278 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1279 buffers
->rb_send_bufs
[--buffers
->rb_send_index
] = req
;
1281 if (req
->rl_reply
) {
1282 buffers
->rb_recv_bufs
[--buffers
->rb_recv_index
] = req
->rl_reply
;
1283 init_waitqueue_head(&req
->rl_reply
->rr_unbind
);
1284 req
->rl_reply
->rr_func
= NULL
;
1285 req
->rl_reply
= NULL
;
1287 switch (ia
->ri_memreg_strategy
) {
1289 case RPCRDMA_MTHCAFMR
:
1290 case RPCRDMA_MEMWINDOWS_ASYNC
:
1291 case RPCRDMA_MEMWINDOWS
:
1293 * Cycle mw's back in reverse order, and "spin" them.
1294 * This delays and scrambles reuse as much as possible.
1298 struct rpcrdma_mw
**mw
;
1299 mw
= &req
->rl_segments
[i
].mr_chunk
.rl_mw
;
1300 list_add_tail(&(*mw
)->mw_list
, &buffers
->rb_mws
);
1302 } while (++i
< RPCRDMA_MAX_SEGS
);
1303 list_add_tail(&req
->rl_segments
[0].mr_chunk
.rl_mw
->mw_list
,
1305 req
->rl_segments
[0].mr_chunk
.rl_mw
= NULL
;
1310 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1314 * Recover reply buffers from pool.
1315 * This happens when recovering from error conditions.
1316 * Post-increment counter/array index.
1319 rpcrdma_recv_buffer_get(struct rpcrdma_req
*req
)
1321 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1322 unsigned long flags
;
1324 if (req
->rl_iov
.length
== 0) /* special case xprt_rdma_allocate() */
1325 buffers
= ((struct rpcrdma_req
*) buffers
)->rl_buffer
;
1326 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1327 if (buffers
->rb_recv_index
< buffers
->rb_max_requests
) {
1328 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1329 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1331 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1335 * Put reply buffers back into pool when not attached to
1336 * request. This happens in error conditions, and when
1337 * aborting unbinds. Pre-decrement counter/array index.
1340 rpcrdma_recv_buffer_put(struct rpcrdma_rep
*rep
)
1342 struct rpcrdma_buffer
*buffers
= rep
->rr_buffer
;
1343 unsigned long flags
;
1345 rep
->rr_func
= NULL
;
1346 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1347 buffers
->rb_recv_bufs
[--buffers
->rb_recv_index
] = rep
;
1348 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1352 * Wrappers for internal-use kmalloc memory registration, used by buffer code.
1356 rpcrdma_register_internal(struct rpcrdma_ia
*ia
, void *va
, int len
,
1357 struct ib_mr
**mrp
, struct ib_sge
*iov
)
1359 struct ib_phys_buf ipb
;
1364 * All memory passed here was kmalloc'ed, therefore phys-contiguous.
1366 iov
->addr
= ib_dma_map_single(ia
->ri_id
->device
,
1367 va
, len
, DMA_BIDIRECTIONAL
);
1370 if (ia
->ri_have_dma_lkey
) {
1372 iov
->lkey
= ia
->ri_dma_lkey
;
1374 } else if (ia
->ri_bind_mem
!= NULL
) {
1376 iov
->lkey
= ia
->ri_bind_mem
->lkey
;
1380 ipb
.addr
= iov
->addr
;
1381 ipb
.size
= iov
->length
;
1382 mr
= ib_reg_phys_mr(ia
->ri_pd
, &ipb
, 1,
1383 IB_ACCESS_LOCAL_WRITE
, &iov
->addr
);
1385 dprintk("RPC: %s: phys convert: 0x%llx "
1386 "registered 0x%llx length %d\n",
1387 __func__
, (unsigned long long)ipb
.addr
,
1388 (unsigned long long)iov
->addr
, len
);
1393 dprintk("RPC: %s: failed with %i\n", __func__
, rc
);
1396 iov
->lkey
= mr
->lkey
;
1404 rpcrdma_deregister_internal(struct rpcrdma_ia
*ia
,
1405 struct ib_mr
*mr
, struct ib_sge
*iov
)
1409 ib_dma_unmap_single(ia
->ri_id
->device
,
1410 iov
->addr
, iov
->length
, DMA_BIDIRECTIONAL
);
1415 rc
= ib_dereg_mr(mr
);
1417 dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__
, rc
);
1422 * Wrappers for chunk registration, shared by read/write chunk code.
1426 rpcrdma_map_one(struct rpcrdma_ia
*ia
, struct rpcrdma_mr_seg
*seg
, int writing
)
1428 seg
->mr_dir
= writing
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
1429 seg
->mr_dmalen
= seg
->mr_len
;
1431 seg
->mr_dma
= ib_dma_map_page(ia
->ri_id
->device
,
1432 seg
->mr_page
, offset_in_page(seg
->mr_offset
),
1433 seg
->mr_dmalen
, seg
->mr_dir
);
1435 seg
->mr_dma
= ib_dma_map_single(ia
->ri_id
->device
,
1437 seg
->mr_dmalen
, seg
->mr_dir
);
1441 rpcrdma_unmap_one(struct rpcrdma_ia
*ia
, struct rpcrdma_mr_seg
*seg
)
1444 ib_dma_unmap_page(ia
->ri_id
->device
,
1445 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
1447 ib_dma_unmap_single(ia
->ri_id
->device
,
1448 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
1452 rpcrdma_register_frmr_external(struct rpcrdma_mr_seg
*seg
,
1453 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
,
1454 struct rpcrdma_xprt
*r_xprt
)
1456 struct rpcrdma_mr_seg
*seg1
= seg
;
1457 struct ib_send_wr frmr_wr
, *bad_wr
;
1462 pageoff
= offset_in_page(seg1
->mr_offset
);
1463 seg1
->mr_offset
-= pageoff
; /* start of page */
1464 seg1
->mr_len
+= pageoff
;
1466 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1467 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1468 for (i
= 0; i
< *nsegs
;) {
1469 rpcrdma_map_one(ia
, seg
, writing
);
1470 seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_pgl
->page_list
[i
] = seg
->mr_dma
;
1474 /* Check for holes */
1475 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1476 offset_in_page((seg
-1)->mr_offset
+ (seg
-1)->mr_len
))
1479 dprintk("RPC: %s: Using frmr %p to map %d segments\n",
1480 __func__
, seg1
->mr_chunk
.rl_mw
, i
);
1483 key
= (u8
)(seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
& 0x000000FF);
1484 ib_update_fast_reg_key(seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
, ++key
);
1486 /* Prepare FRMR WR */
1487 memset(&frmr_wr
, 0, sizeof frmr_wr
);
1488 frmr_wr
.opcode
= IB_WR_FAST_REG_MR
;
1489 frmr_wr
.send_flags
= 0; /* unsignaled */
1490 frmr_wr
.wr
.fast_reg
.iova_start
= (unsigned long)seg1
->mr_dma
;
1491 frmr_wr
.wr
.fast_reg
.page_list
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_pgl
;
1492 frmr_wr
.wr
.fast_reg
.page_list_len
= i
;
1493 frmr_wr
.wr
.fast_reg
.page_shift
= PAGE_SHIFT
;
1494 frmr_wr
.wr
.fast_reg
.length
= i
<< PAGE_SHIFT
;
1495 frmr_wr
.wr
.fast_reg
.access_flags
= (writing
?
1496 IB_ACCESS_REMOTE_WRITE
: IB_ACCESS_REMOTE_READ
);
1497 frmr_wr
.wr
.fast_reg
.rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1498 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1500 rc
= ib_post_send(ia
->ri_id
->qp
, &frmr_wr
, &bad_wr
);
1503 dprintk("RPC: %s: failed ib_post_send for register,"
1504 " status %i\n", __func__
, rc
);
1506 rpcrdma_unmap_one(ia
, --seg
);
1508 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1509 seg1
->mr_base
= seg1
->mr_dma
+ pageoff
;
1518 rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg
*seg
,
1519 struct rpcrdma_ia
*ia
, struct rpcrdma_xprt
*r_xprt
)
1521 struct rpcrdma_mr_seg
*seg1
= seg
;
1522 struct ib_send_wr invalidate_wr
, *bad_wr
;
1525 while (seg1
->mr_nsegs
--)
1526 rpcrdma_unmap_one(ia
, seg
++);
1528 memset(&invalidate_wr
, 0, sizeof invalidate_wr
);
1529 invalidate_wr
.opcode
= IB_WR_LOCAL_INV
;
1530 invalidate_wr
.send_flags
= 0; /* unsignaled */
1531 invalidate_wr
.ex
.invalidate_rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1532 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1534 rc
= ib_post_send(ia
->ri_id
->qp
, &invalidate_wr
, &bad_wr
);
1536 dprintk("RPC: %s: failed ib_post_send for invalidate,"
1537 " status %i\n", __func__
, rc
);
1542 rpcrdma_register_fmr_external(struct rpcrdma_mr_seg
*seg
,
1543 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
)
1545 struct rpcrdma_mr_seg
*seg1
= seg
;
1546 u64 physaddrs
[RPCRDMA_MAX_DATA_SEGS
];
1547 int len
, pageoff
, i
, rc
;
1549 pageoff
= offset_in_page(seg1
->mr_offset
);
1550 seg1
->mr_offset
-= pageoff
; /* start of page */
1551 seg1
->mr_len
+= pageoff
;
1553 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1554 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1555 for (i
= 0; i
< *nsegs
;) {
1556 rpcrdma_map_one(ia
, seg
, writing
);
1557 physaddrs
[i
] = seg
->mr_dma
;
1561 /* Check for holes */
1562 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1563 offset_in_page((seg
-1)->mr_offset
+ (seg
-1)->mr_len
))
1566 rc
= ib_map_phys_fmr(seg1
->mr_chunk
.rl_mw
->r
.fmr
,
1567 physaddrs
, i
, seg1
->mr_dma
);
1569 dprintk("RPC: %s: failed ib_map_phys_fmr "
1570 "%u@0x%llx+%i (%d)... status %i\n", __func__
,
1571 len
, (unsigned long long)seg1
->mr_dma
,
1574 rpcrdma_unmap_one(ia
, --seg
);
1576 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mw
->r
.fmr
->rkey
;
1577 seg1
->mr_base
= seg1
->mr_dma
+ pageoff
;
1586 rpcrdma_deregister_fmr_external(struct rpcrdma_mr_seg
*seg
,
1587 struct rpcrdma_ia
*ia
)
1589 struct rpcrdma_mr_seg
*seg1
= seg
;
1593 list_add(&seg1
->mr_chunk
.rl_mw
->r
.fmr
->list
, &l
);
1594 rc
= ib_unmap_fmr(&l
);
1595 while (seg1
->mr_nsegs
--)
1596 rpcrdma_unmap_one(ia
, seg
++);
1598 dprintk("RPC: %s: failed ib_unmap_fmr,"
1599 " status %i\n", __func__
, rc
);
1604 rpcrdma_register_memwin_external(struct rpcrdma_mr_seg
*seg
,
1605 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
,
1606 struct rpcrdma_xprt
*r_xprt
)
1608 int mem_priv
= (writing
? IB_ACCESS_REMOTE_WRITE
:
1609 IB_ACCESS_REMOTE_READ
);
1610 struct ib_mw_bind param
;
1614 rpcrdma_map_one(ia
, seg
, writing
);
1615 param
.mr
= ia
->ri_bind_mem
;
1616 param
.wr_id
= 0ULL; /* no send cookie */
1617 param
.addr
= seg
->mr_dma
;
1618 param
.length
= seg
->mr_len
;
1619 param
.send_flags
= 0;
1620 param
.mw_access_flags
= mem_priv
;
1622 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1623 rc
= ib_bind_mw(ia
->ri_id
->qp
, seg
->mr_chunk
.rl_mw
->r
.mw
, ¶m
);
1625 dprintk("RPC: %s: failed ib_bind_mw "
1626 "%u@0x%llx status %i\n",
1627 __func__
, seg
->mr_len
,
1628 (unsigned long long)seg
->mr_dma
, rc
);
1629 rpcrdma_unmap_one(ia
, seg
);
1631 seg
->mr_rkey
= seg
->mr_chunk
.rl_mw
->r
.mw
->rkey
;
1632 seg
->mr_base
= param
.addr
;
1639 rpcrdma_deregister_memwin_external(struct rpcrdma_mr_seg
*seg
,
1640 struct rpcrdma_ia
*ia
,
1641 struct rpcrdma_xprt
*r_xprt
, void **r
)
1643 struct ib_mw_bind param
;
1647 BUG_ON(seg
->mr_nsegs
!= 1);
1648 param
.mr
= ia
->ri_bind_mem
;
1649 param
.addr
= 0ULL; /* unbind */
1651 param
.mw_access_flags
= 0;
1653 param
.wr_id
= (u64
) (unsigned long) *r
;
1654 param
.send_flags
= IB_SEND_SIGNALED
;
1655 INIT_CQCOUNT(&r_xprt
->rx_ep
);
1658 param
.send_flags
= 0;
1659 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1661 rc
= ib_bind_mw(ia
->ri_id
->qp
, seg
->mr_chunk
.rl_mw
->r
.mw
, ¶m
);
1662 rpcrdma_unmap_one(ia
, seg
);
1664 dprintk("RPC: %s: failed ib_(un)bind_mw,"
1665 " status %i\n", __func__
, rc
);
1667 *r
= NULL
; /* will upcall on completion */
1672 rpcrdma_register_default_external(struct rpcrdma_mr_seg
*seg
,
1673 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
)
1675 int mem_priv
= (writing
? IB_ACCESS_REMOTE_WRITE
:
1676 IB_ACCESS_REMOTE_READ
);
1677 struct rpcrdma_mr_seg
*seg1
= seg
;
1678 struct ib_phys_buf ipb
[RPCRDMA_MAX_DATA_SEGS
];
1681 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1682 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1683 for (len
= 0, i
= 0; i
< *nsegs
;) {
1684 rpcrdma_map_one(ia
, seg
, writing
);
1685 ipb
[i
].addr
= seg
->mr_dma
;
1686 ipb
[i
].size
= seg
->mr_len
;
1690 /* Check for holes */
1691 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1692 offset_in_page((seg
-1)->mr_offset
+(seg
-1)->mr_len
))
1695 seg1
->mr_base
= seg1
->mr_dma
;
1696 seg1
->mr_chunk
.rl_mr
= ib_reg_phys_mr(ia
->ri_pd
,
1697 ipb
, i
, mem_priv
, &seg1
->mr_base
);
1698 if (IS_ERR(seg1
->mr_chunk
.rl_mr
)) {
1699 rc
= PTR_ERR(seg1
->mr_chunk
.rl_mr
);
1700 dprintk("RPC: %s: failed ib_reg_phys_mr "
1701 "%u@0x%llx (%d)... status %i\n",
1703 (unsigned long long)seg1
->mr_dma
, i
, rc
);
1705 rpcrdma_unmap_one(ia
, --seg
);
1707 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mr
->rkey
;
1716 rpcrdma_deregister_default_external(struct rpcrdma_mr_seg
*seg
,
1717 struct rpcrdma_ia
*ia
)
1719 struct rpcrdma_mr_seg
*seg1
= seg
;
1722 rc
= ib_dereg_mr(seg1
->mr_chunk
.rl_mr
);
1723 seg1
->mr_chunk
.rl_mr
= NULL
;
1724 while (seg1
->mr_nsegs
--)
1725 rpcrdma_unmap_one(ia
, seg
++);
1727 dprintk("RPC: %s: failed ib_dereg_mr,"
1728 " status %i\n", __func__
, rc
);
1733 rpcrdma_register_external(struct rpcrdma_mr_seg
*seg
,
1734 int nsegs
, int writing
, struct rpcrdma_xprt
*r_xprt
)
1736 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
1739 switch (ia
->ri_memreg_strategy
) {
1741 #if RPCRDMA_PERSISTENT_REGISTRATION
1742 case RPCRDMA_ALLPHYSICAL
:
1743 rpcrdma_map_one(ia
, seg
, writing
);
1744 seg
->mr_rkey
= ia
->ri_bind_mem
->rkey
;
1745 seg
->mr_base
= seg
->mr_dma
;
1751 /* Registration using frmr registration */
1753 rc
= rpcrdma_register_frmr_external(seg
, &nsegs
, writing
, ia
, r_xprt
);
1756 /* Registration using fmr memory registration */
1757 case RPCRDMA_MTHCAFMR
:
1758 rc
= rpcrdma_register_fmr_external(seg
, &nsegs
, writing
, ia
);
1761 /* Registration using memory windows */
1762 case RPCRDMA_MEMWINDOWS_ASYNC
:
1763 case RPCRDMA_MEMWINDOWS
:
1764 rc
= rpcrdma_register_memwin_external(seg
, &nsegs
, writing
, ia
, r_xprt
);
1767 /* Default registration each time */
1769 rc
= rpcrdma_register_default_external(seg
, &nsegs
, writing
, ia
);
1779 rpcrdma_deregister_external(struct rpcrdma_mr_seg
*seg
,
1780 struct rpcrdma_xprt
*r_xprt
, void *r
)
1782 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
1783 int nsegs
= seg
->mr_nsegs
, rc
;
1785 switch (ia
->ri_memreg_strategy
) {
1787 #if RPCRDMA_PERSISTENT_REGISTRATION
1788 case RPCRDMA_ALLPHYSICAL
:
1790 rpcrdma_unmap_one(ia
, seg
);
1796 rc
= rpcrdma_deregister_frmr_external(seg
, ia
, r_xprt
);
1799 case RPCRDMA_MTHCAFMR
:
1800 rc
= rpcrdma_deregister_fmr_external(seg
, ia
);
1803 case RPCRDMA_MEMWINDOWS_ASYNC
:
1804 case RPCRDMA_MEMWINDOWS
:
1805 rc
= rpcrdma_deregister_memwin_external(seg
, ia
, r_xprt
, &r
);
1809 rc
= rpcrdma_deregister_default_external(seg
, ia
);
1813 struct rpcrdma_rep
*rep
= r
;
1814 void (*func
)(struct rpcrdma_rep
*) = rep
->rr_func
;
1815 rep
->rr_func
= NULL
;
1816 func(rep
); /* dereg done, callback now */
1822 * Prepost any receive buffer, then post send.
1824 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1827 rpcrdma_ep_post(struct rpcrdma_ia
*ia
,
1828 struct rpcrdma_ep
*ep
,
1829 struct rpcrdma_req
*req
)
1831 struct ib_send_wr send_wr
, *send_wr_fail
;
1832 struct rpcrdma_rep
*rep
= req
->rl_reply
;
1836 rc
= rpcrdma_ep_post_recv(ia
, ep
, rep
);
1839 req
->rl_reply
= NULL
;
1842 send_wr
.next
= NULL
;
1843 send_wr
.wr_id
= 0ULL; /* no send cookie */
1844 send_wr
.sg_list
= req
->rl_send_iov
;
1845 send_wr
.num_sge
= req
->rl_niovs
;
1846 send_wr
.opcode
= IB_WR_SEND
;
1847 if (send_wr
.num_sge
== 4) /* no need to sync any pad (constant) */
1848 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1849 req
->rl_send_iov
[3].addr
, req
->rl_send_iov
[3].length
,
1851 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1852 req
->rl_send_iov
[1].addr
, req
->rl_send_iov
[1].length
,
1854 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1855 req
->rl_send_iov
[0].addr
, req
->rl_send_iov
[0].length
,
1858 if (DECR_CQCOUNT(ep
) > 0)
1859 send_wr
.send_flags
= 0;
1860 else { /* Provider must take a send completion every now and then */
1862 send_wr
.send_flags
= IB_SEND_SIGNALED
;
1865 rc
= ib_post_send(ia
->ri_id
->qp
, &send_wr
, &send_wr_fail
);
1867 dprintk("RPC: %s: ib_post_send returned %i\n", __func__
,
1874 * (Re)post a receive buffer.
1877 rpcrdma_ep_post_recv(struct rpcrdma_ia
*ia
,
1878 struct rpcrdma_ep
*ep
,
1879 struct rpcrdma_rep
*rep
)
1881 struct ib_recv_wr recv_wr
, *recv_wr_fail
;
1884 recv_wr
.next
= NULL
;
1885 recv_wr
.wr_id
= (u64
) (unsigned long) rep
;
1886 recv_wr
.sg_list
= &rep
->rr_iov
;
1887 recv_wr
.num_sge
= 1;
1889 ib_dma_sync_single_for_cpu(ia
->ri_id
->device
,
1890 rep
->rr_iov
.addr
, rep
->rr_iov
.length
, DMA_BIDIRECTIONAL
);
1893 rc
= ib_post_recv(ia
->ri_id
->qp
, &recv_wr
, &recv_wr_fail
);
1896 dprintk("RPC: %s: ib_post_recv returned %i\n", __func__
,