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
:
287 complete(&ia
->ri_done
);
289 case RDMA_CM_EVENT_ADDR_ERROR
:
290 ia
->ri_async_rc
= -EHOSTUNREACH
;
291 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
293 complete(&ia
->ri_done
);
295 case RDMA_CM_EVENT_ROUTE_ERROR
:
296 ia
->ri_async_rc
= -ENETUNREACH
;
297 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
299 complete(&ia
->ri_done
);
301 case RDMA_CM_EVENT_ESTABLISHED
:
303 ib_query_qp(ia
->ri_id
->qp
, &attr
,
304 IB_QP_MAX_QP_RD_ATOMIC
| IB_QP_MAX_DEST_RD_ATOMIC
,
306 dprintk("RPC: %s: %d responder resources"
308 __func__
, attr
.max_dest_rd_atomic
, attr
.max_rd_atomic
);
310 case RDMA_CM_EVENT_CONNECT_ERROR
:
311 connstate
= -ENOTCONN
;
313 case RDMA_CM_EVENT_UNREACHABLE
:
314 connstate
= -ENETDOWN
;
316 case RDMA_CM_EVENT_REJECTED
:
317 connstate
= -ECONNREFUSED
;
319 case RDMA_CM_EVENT_DISCONNECTED
:
320 connstate
= -ECONNABORTED
;
322 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
325 dprintk("RPC: %s: %s: %u.%u.%u.%u:%u"
326 " (ep 0x%p event 0x%x)\n",
328 (event
->event
<= 11) ? conn
[event
->event
] :
329 "unknown connection error",
330 NIPQUAD(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
);
349 static struct rdma_cm_id
*
350 rpcrdma_create_id(struct rpcrdma_xprt
*xprt
,
351 struct rpcrdma_ia
*ia
, struct sockaddr
*addr
)
353 struct rdma_cm_id
*id
;
356 init_completion(&ia
->ri_done
);
358 id
= rdma_create_id(rpcrdma_conn_upcall
, xprt
, RDMA_PS_TCP
);
361 dprintk("RPC: %s: rdma_create_id() failed %i\n",
367 rc
= rdma_resolve_addr(id
, NULL
, addr
, RDMA_RESOLVE_TIMEOUT
);
369 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
373 wait_for_completion(&ia
->ri_done
);
374 rc
= ia
->ri_async_rc
;
379 rc
= rdma_resolve_route(id
, RDMA_RESOLVE_TIMEOUT
);
381 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
385 wait_for_completion(&ia
->ri_done
);
386 rc
= ia
->ri_async_rc
;
398 * Drain any cq, prior to teardown.
401 rpcrdma_clean_cq(struct ib_cq
*cq
)
406 while (1 == ib_poll_cq(cq
, 1, &wc
))
410 dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
411 __func__
, count
, wc
.opcode
);
415 * Exported functions.
419 * Open and initialize an Interface Adapter.
420 * o initializes fields of struct rpcrdma_ia, including
421 * interface and provider attributes and protection zone.
424 rpcrdma_ia_open(struct rpcrdma_xprt
*xprt
, struct sockaddr
*addr
, int memreg
)
427 struct ib_device_attr devattr
;
428 struct rpcrdma_ia
*ia
= &xprt
->rx_ia
;
430 ia
->ri_id
= rpcrdma_create_id(xprt
, ia
, addr
);
431 if (IS_ERR(ia
->ri_id
)) {
432 rc
= PTR_ERR(ia
->ri_id
);
436 ia
->ri_pd
= ib_alloc_pd(ia
->ri_id
->device
);
437 if (IS_ERR(ia
->ri_pd
)) {
438 rc
= PTR_ERR(ia
->ri_pd
);
439 dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
445 * Query the device to determine if the requested memory
446 * registration strategy is supported. If it isn't, set the
447 * strategy to a globally supported model.
449 rc
= ib_query_device(ia
->ri_id
->device
, &devattr
);
451 dprintk("RPC: %s: ib_query_device failed %d\n",
456 if (devattr
.device_cap_flags
& IB_DEVICE_LOCAL_DMA_LKEY
) {
457 ia
->ri_have_dma_lkey
= 1;
458 ia
->ri_dma_lkey
= ia
->ri_id
->device
->local_dma_lkey
;
462 case RPCRDMA_MEMWINDOWS
:
463 case RPCRDMA_MEMWINDOWS_ASYNC
:
464 if (!(devattr
.device_cap_flags
& IB_DEVICE_MEM_WINDOW
)) {
465 dprintk("RPC: %s: MEMWINDOWS registration "
466 "specified but not supported by adapter, "
467 "using slower RPCRDMA_REGISTER\n",
469 memreg
= RPCRDMA_REGISTER
;
472 case RPCRDMA_MTHCAFMR
:
473 if (!ia
->ri_id
->device
->alloc_fmr
) {
474 #if RPCRDMA_PERSISTENT_REGISTRATION
475 dprintk("RPC: %s: MTHCAFMR registration "
476 "specified but not supported by adapter, "
477 "using riskier RPCRDMA_ALLPHYSICAL\n",
479 memreg
= RPCRDMA_ALLPHYSICAL
;
481 dprintk("RPC: %s: MTHCAFMR registration "
482 "specified but not supported by adapter, "
483 "using slower RPCRDMA_REGISTER\n",
485 memreg
= RPCRDMA_REGISTER
;
490 /* Requires both frmr reg and local dma lkey */
491 if ((devattr
.device_cap_flags
&
492 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) !=
493 (IB_DEVICE_MEM_MGT_EXTENSIONS
|IB_DEVICE_LOCAL_DMA_LKEY
)) {
494 #if RPCRDMA_PERSISTENT_REGISTRATION
495 dprintk("RPC: %s: FRMR registration "
496 "specified but not supported by adapter, "
497 "using riskier RPCRDMA_ALLPHYSICAL\n",
499 memreg
= RPCRDMA_ALLPHYSICAL
;
501 dprintk("RPC: %s: FRMR registration "
502 "specified but not supported by adapter, "
503 "using slower RPCRDMA_REGISTER\n",
505 memreg
= RPCRDMA_REGISTER
;
512 * Optionally obtain an underlying physical identity mapping in
513 * order to do a memory window-based bind. This base registration
514 * is protected from remote access - that is enabled only by binding
515 * for the specific bytes targeted during each RPC operation, and
516 * revoked after the corresponding completion similar to a storage
520 case RPCRDMA_BOUNCEBUFFERS
:
521 case RPCRDMA_REGISTER
:
524 #if RPCRDMA_PERSISTENT_REGISTRATION
525 case RPCRDMA_ALLPHYSICAL
:
526 mem_priv
= IB_ACCESS_LOCAL_WRITE
|
527 IB_ACCESS_REMOTE_WRITE
|
528 IB_ACCESS_REMOTE_READ
;
531 case RPCRDMA_MEMWINDOWS_ASYNC
:
532 case RPCRDMA_MEMWINDOWS
:
533 mem_priv
= IB_ACCESS_LOCAL_WRITE
|
536 case RPCRDMA_MTHCAFMR
:
537 if (ia
->ri_have_dma_lkey
)
539 mem_priv
= IB_ACCESS_LOCAL_WRITE
;
541 ia
->ri_bind_mem
= ib_get_dma_mr(ia
->ri_pd
, mem_priv
);
542 if (IS_ERR(ia
->ri_bind_mem
)) {
543 printk(KERN_ALERT
"%s: ib_get_dma_mr for "
544 "phys register failed with %lX\n\t"
545 "Will continue with degraded performance\n",
546 __func__
, PTR_ERR(ia
->ri_bind_mem
));
547 memreg
= RPCRDMA_REGISTER
;
548 ia
->ri_bind_mem
= NULL
;
552 printk(KERN_ERR
"%s: invalid memory registration mode %d\n",
557 dprintk("RPC: %s: memory registration strategy is %d\n",
560 /* Else will do memory reg/dereg for each chunk */
561 ia
->ri_memreg_strategy
= memreg
;
565 rdma_destroy_id(ia
->ri_id
);
572 * Clean up/close an IA.
573 * o if event handles and PD have been initialized, free them.
577 rpcrdma_ia_close(struct rpcrdma_ia
*ia
)
581 dprintk("RPC: %s: entering\n", __func__
);
582 if (ia
->ri_bind_mem
!= NULL
) {
583 rc
= ib_dereg_mr(ia
->ri_bind_mem
);
584 dprintk("RPC: %s: ib_dereg_mr returned %i\n",
587 if (ia
->ri_id
!= NULL
&& !IS_ERR(ia
->ri_id
)) {
589 rdma_destroy_qp(ia
->ri_id
);
590 rdma_destroy_id(ia
->ri_id
);
593 if (ia
->ri_pd
!= NULL
&& !IS_ERR(ia
->ri_pd
)) {
594 rc
= ib_dealloc_pd(ia
->ri_pd
);
595 dprintk("RPC: %s: ib_dealloc_pd returned %i\n",
601 * Create unconnected endpoint.
604 rpcrdma_ep_create(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
,
605 struct rpcrdma_create_data_internal
*cdata
)
607 struct ib_device_attr devattr
;
610 rc
= ib_query_device(ia
->ri_id
->device
, &devattr
);
612 dprintk("RPC: %s: ib_query_device failed %d\n",
617 /* check provider's send/recv wr limits */
618 if (cdata
->max_requests
> devattr
.max_qp_wr
)
619 cdata
->max_requests
= devattr
.max_qp_wr
;
621 ep
->rep_attr
.event_handler
= rpcrdma_qp_async_error_upcall
;
622 ep
->rep_attr
.qp_context
= ep
;
623 /* send_cq and recv_cq initialized below */
624 ep
->rep_attr
.srq
= NULL
;
625 ep
->rep_attr
.cap
.max_send_wr
= cdata
->max_requests
;
626 switch (ia
->ri_memreg_strategy
) {
628 /* Add room for frmr register and invalidate WRs */
629 ep
->rep_attr
.cap
.max_send_wr
*= 3;
630 if (ep
->rep_attr
.cap
.max_send_wr
> devattr
.max_qp_wr
)
633 case RPCRDMA_MEMWINDOWS_ASYNC
:
634 case RPCRDMA_MEMWINDOWS
:
635 /* Add room for mw_binds+unbinds - overkill! */
636 ep
->rep_attr
.cap
.max_send_wr
++;
637 ep
->rep_attr
.cap
.max_send_wr
*= (2 * RPCRDMA_MAX_SEGS
);
638 if (ep
->rep_attr
.cap
.max_send_wr
> devattr
.max_qp_wr
)
644 ep
->rep_attr
.cap
.max_recv_wr
= cdata
->max_requests
;
645 ep
->rep_attr
.cap
.max_send_sge
= (cdata
->padding
? 4 : 2);
646 ep
->rep_attr
.cap
.max_recv_sge
= 1;
647 ep
->rep_attr
.cap
.max_inline_data
= 0;
648 ep
->rep_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
649 ep
->rep_attr
.qp_type
= IB_QPT_RC
;
650 ep
->rep_attr
.port_num
= ~0;
652 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
653 "iovs: send %d recv %d\n",
655 ep
->rep_attr
.cap
.max_send_wr
,
656 ep
->rep_attr
.cap
.max_recv_wr
,
657 ep
->rep_attr
.cap
.max_send_sge
,
658 ep
->rep_attr
.cap
.max_recv_sge
);
660 /* set trigger for requesting send completion */
661 ep
->rep_cqinit
= ep
->rep_attr
.cap
.max_send_wr
/2 /* - 1*/;
662 switch (ia
->ri_memreg_strategy
) {
663 case RPCRDMA_MEMWINDOWS_ASYNC
:
664 case RPCRDMA_MEMWINDOWS
:
665 ep
->rep_cqinit
-= RPCRDMA_MAX_SEGS
;
670 if (ep
->rep_cqinit
<= 2)
674 init_waitqueue_head(&ep
->rep_connect_wait
);
677 * Create a single cq for receive dto and mw_bind (only ever
678 * care about unbind, really). Send completions are suppressed.
679 * Use single threaded tasklet upcalls to maintain ordering.
681 ep
->rep_cq
= ib_create_cq(ia
->ri_id
->device
, rpcrdma_cq_event_upcall
,
682 rpcrdma_cq_async_error_upcall
, NULL
,
683 ep
->rep_attr
.cap
.max_recv_wr
+
684 ep
->rep_attr
.cap
.max_send_wr
+ 1, 0);
685 if (IS_ERR(ep
->rep_cq
)) {
686 rc
= PTR_ERR(ep
->rep_cq
);
687 dprintk("RPC: %s: ib_create_cq failed: %i\n",
692 rc
= ib_req_notify_cq(ep
->rep_cq
, IB_CQ_NEXT_COMP
);
694 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
699 ep
->rep_attr
.send_cq
= ep
->rep_cq
;
700 ep
->rep_attr
.recv_cq
= ep
->rep_cq
;
702 /* Initialize cma parameters */
704 /* RPC/RDMA does not use private data */
705 ep
->rep_remote_cma
.private_data
= NULL
;
706 ep
->rep_remote_cma
.private_data_len
= 0;
708 /* Client offers RDMA Read but does not initiate */
709 ep
->rep_remote_cma
.initiator_depth
= 0;
710 if (ia
->ri_memreg_strategy
== RPCRDMA_BOUNCEBUFFERS
)
711 ep
->rep_remote_cma
.responder_resources
= 0;
712 else if (devattr
.max_qp_rd_atom
> 32) /* arbitrary but <= 255 */
713 ep
->rep_remote_cma
.responder_resources
= 32;
715 ep
->rep_remote_cma
.responder_resources
= devattr
.max_qp_rd_atom
;
717 ep
->rep_remote_cma
.retry_count
= 7;
718 ep
->rep_remote_cma
.flow_control
= 0;
719 ep
->rep_remote_cma
.rnr_retry_count
= 0;
724 err
= ib_destroy_cq(ep
->rep_cq
);
726 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
735 * Disconnect and destroy endpoint. After this, the only
736 * valid operations on the ep are to free it (if dynamically
737 * allocated) or re-create it.
739 * The caller's error handling must be sure to not leak the endpoint
740 * if this function fails.
743 rpcrdma_ep_destroy(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
747 dprintk("RPC: %s: entering, connected is %d\n",
748 __func__
, ep
->rep_connected
);
751 rc
= rpcrdma_ep_disconnect(ep
, ia
);
753 dprintk("RPC: %s: rpcrdma_ep_disconnect"
754 " returned %i\n", __func__
, rc
);
755 rdma_destroy_qp(ia
->ri_id
);
756 ia
->ri_id
->qp
= NULL
;
759 /* padding - could be done in rpcrdma_buffer_destroy... */
760 if (ep
->rep_pad_mr
) {
761 rpcrdma_deregister_internal(ia
, ep
->rep_pad_mr
, &ep
->rep_pad
);
762 ep
->rep_pad_mr
= NULL
;
765 rpcrdma_clean_cq(ep
->rep_cq
);
766 rc
= ib_destroy_cq(ep
->rep_cq
);
768 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
775 * Connect unconnected endpoint.
778 rpcrdma_ep_connect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
780 struct rdma_cm_id
*id
;
783 int reconnect
= (ep
->rep_connected
!= 0);
786 struct rpcrdma_xprt
*xprt
;
788 rc
= rpcrdma_ep_disconnect(ep
, ia
);
789 if (rc
&& rc
!= -ENOTCONN
)
790 dprintk("RPC: %s: rpcrdma_ep_disconnect"
791 " status %i\n", __func__
, rc
);
792 rpcrdma_clean_cq(ep
->rep_cq
);
794 xprt
= container_of(ia
, struct rpcrdma_xprt
, rx_ia
);
795 id
= rpcrdma_create_id(xprt
, ia
,
796 (struct sockaddr
*)&xprt
->rx_data
.addr
);
801 /* TEMP TEMP TEMP - fail if new device:
802 * Deregister/remarshal *all* requests!
803 * Close and recreate adapter, pd, etc!
804 * Re-determine all attributes still sane!
805 * More stuff I haven't thought of!
808 if (ia
->ri_id
->device
!= id
->device
) {
809 printk("RPC: %s: can't reconnect on "
810 "different device!\n", __func__
);
816 rdma_destroy_qp(ia
->ri_id
);
817 rdma_destroy_id(ia
->ri_id
);
821 rc
= rdma_create_qp(ia
->ri_id
, ia
->ri_pd
, &ep
->rep_attr
);
823 dprintk("RPC: %s: rdma_create_qp failed %i\n",
828 /* XXX Tavor device performs badly with 2K MTU! */
829 if (strnicmp(ia
->ri_id
->device
->dma_device
->bus
->name
, "pci", 3) == 0) {
830 struct pci_dev
*pcid
= to_pci_dev(ia
->ri_id
->device
->dma_device
);
831 if (pcid
->device
== PCI_DEVICE_ID_MELLANOX_TAVOR
&&
832 (pcid
->vendor
== PCI_VENDOR_ID_MELLANOX
||
833 pcid
->vendor
== PCI_VENDOR_ID_TOPSPIN
)) {
834 struct ib_qp_attr attr
= {
835 .path_mtu
= IB_MTU_1024
837 rc
= ib_modify_qp(ia
->ri_id
->qp
, &attr
, IB_QP_PATH_MTU
);
841 ep
->rep_connected
= 0;
843 rc
= rdma_connect(ia
->ri_id
, &ep
->rep_remote_cma
);
845 dprintk("RPC: %s: rdma_connect() failed with %i\n",
853 wait_event_interruptible(ep
->rep_connect_wait
, ep
->rep_connected
!= 0);
856 * Check state. A non-peer reject indicates no listener
857 * (ECONNREFUSED), which may be a transient state. All
858 * others indicate a transport condition which has already
859 * undergone a best-effort.
861 if (ep
->rep_connected
== -ECONNREFUSED
862 && ++retry_count
<= RDMA_CONNECT_RETRY_MAX
) {
863 dprintk("RPC: %s: non-peer_reject, retry\n", __func__
);
866 if (ep
->rep_connected
<= 0) {
867 /* Sometimes, the only way to reliably connect to remote
868 * CMs is to use same nonzero values for ORD and IRD. */
869 if (retry_count
++ <= RDMA_CONNECT_RETRY_MAX
+ 1 &&
870 (ep
->rep_remote_cma
.responder_resources
== 0 ||
871 ep
->rep_remote_cma
.initiator_depth
!=
872 ep
->rep_remote_cma
.responder_resources
)) {
873 if (ep
->rep_remote_cma
.responder_resources
== 0)
874 ep
->rep_remote_cma
.responder_resources
= 1;
875 ep
->rep_remote_cma
.initiator_depth
=
876 ep
->rep_remote_cma
.responder_resources
;
879 rc
= ep
->rep_connected
;
881 dprintk("RPC: %s: connected\n", __func__
);
886 ep
->rep_connected
= rc
;
891 * rpcrdma_ep_disconnect
893 * This is separate from destroy to facilitate the ability
894 * to reconnect without recreating the endpoint.
896 * This call is not reentrant, and must not be made in parallel
897 * on the same endpoint.
900 rpcrdma_ep_disconnect(struct rpcrdma_ep
*ep
, struct rpcrdma_ia
*ia
)
904 rpcrdma_clean_cq(ep
->rep_cq
);
905 rc
= rdma_disconnect(ia
->ri_id
);
907 /* returns without wait if not connected */
908 wait_event_interruptible(ep
->rep_connect_wait
,
909 ep
->rep_connected
!= 1);
910 dprintk("RPC: %s: after wait, %sconnected\n", __func__
,
911 (ep
->rep_connected
== 1) ? "still " : "dis");
913 dprintk("RPC: %s: rdma_disconnect %i\n", __func__
, rc
);
914 ep
->rep_connected
= rc
;
920 * Initialize buffer memory
923 rpcrdma_buffer_create(struct rpcrdma_buffer
*buf
, struct rpcrdma_ep
*ep
,
924 struct rpcrdma_ia
*ia
, struct rpcrdma_create_data_internal
*cdata
)
929 struct rpcrdma_mw
*r
;
931 buf
->rb_max_requests
= cdata
->max_requests
;
932 spin_lock_init(&buf
->rb_lock
);
933 atomic_set(&buf
->rb_credits
, 1);
936 * 1. arrays for send and recv pointers
937 * 2. arrays of struct rpcrdma_req to fill in pointers
938 * 3. array of struct rpcrdma_rep for replies
940 * 5. mw's, fmr's or frmr's, if any
941 * Send/recv buffers in req/rep need to be registered
944 len
= buf
->rb_max_requests
*
945 (sizeof(struct rpcrdma_req
*) + sizeof(struct rpcrdma_rep
*));
946 len
+= cdata
->padding
;
947 switch (ia
->ri_memreg_strategy
) {
949 len
+= buf
->rb_max_requests
* RPCRDMA_MAX_SEGS
*
950 sizeof(struct rpcrdma_mw
);
952 case RPCRDMA_MTHCAFMR
:
953 /* TBD we are perhaps overallocating here */
954 len
+= (buf
->rb_max_requests
+ 1) * RPCRDMA_MAX_SEGS
*
955 sizeof(struct rpcrdma_mw
);
957 case RPCRDMA_MEMWINDOWS_ASYNC
:
958 case RPCRDMA_MEMWINDOWS
:
959 len
+= (buf
->rb_max_requests
+ 1) * RPCRDMA_MAX_SEGS
*
960 sizeof(struct rpcrdma_mw
);
966 /* allocate 1, 4 and 5 in one shot */
967 p
= kzalloc(len
, GFP_KERNEL
);
969 dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
974 buf
->rb_pool
= p
; /* for freeing it later */
976 buf
->rb_send_bufs
= (struct rpcrdma_req
**) p
;
977 p
= (char *) &buf
->rb_send_bufs
[buf
->rb_max_requests
];
978 buf
->rb_recv_bufs
= (struct rpcrdma_rep
**) p
;
979 p
= (char *) &buf
->rb_recv_bufs
[buf
->rb_max_requests
];
982 * Register the zeroed pad buffer, if any.
984 if (cdata
->padding
) {
985 rc
= rpcrdma_register_internal(ia
, p
, cdata
->padding
,
986 &ep
->rep_pad_mr
, &ep
->rep_pad
);
993 * Allocate the fmr's, or mw's for mw_bind chunk registration.
994 * We "cycle" the mw's in order to minimize rkey reuse,
995 * and also reduce unbind-to-bind collision.
997 INIT_LIST_HEAD(&buf
->rb_mws
);
998 r
= (struct rpcrdma_mw
*)p
;
999 switch (ia
->ri_memreg_strategy
) {
1001 for (i
= buf
->rb_max_requests
* RPCRDMA_MAX_SEGS
; i
; i
--) {
1002 r
->r
.frmr
.fr_mr
= ib_alloc_fast_reg_mr(ia
->ri_pd
,
1004 if (IS_ERR(r
->r
.frmr
.fr_mr
)) {
1005 rc
= PTR_ERR(r
->r
.frmr
.fr_mr
);
1006 dprintk("RPC: %s: ib_alloc_fast_reg_mr"
1007 " failed %i\n", __func__
, rc
);
1011 ib_alloc_fast_reg_page_list(ia
->ri_id
->device
,
1013 if (IS_ERR(r
->r
.frmr
.fr_pgl
)) {
1014 rc
= PTR_ERR(r
->r
.frmr
.fr_pgl
);
1016 "ib_alloc_fast_reg_page_list "
1017 "failed %i\n", __func__
, rc
);
1020 list_add(&r
->mw_list
, &buf
->rb_mws
);
1024 case RPCRDMA_MTHCAFMR
:
1025 /* TBD we are perhaps overallocating here */
1026 for (i
= (buf
->rb_max_requests
+1) * RPCRDMA_MAX_SEGS
; i
; i
--) {
1027 static struct ib_fmr_attr fa
=
1028 { RPCRDMA_MAX_DATA_SEGS
, 1, PAGE_SHIFT
};
1029 r
->r
.fmr
= ib_alloc_fmr(ia
->ri_pd
,
1030 IB_ACCESS_REMOTE_WRITE
| IB_ACCESS_REMOTE_READ
,
1032 if (IS_ERR(r
->r
.fmr
)) {
1033 rc
= PTR_ERR(r
->r
.fmr
);
1034 dprintk("RPC: %s: ib_alloc_fmr"
1035 " failed %i\n", __func__
, rc
);
1038 list_add(&r
->mw_list
, &buf
->rb_mws
);
1042 case RPCRDMA_MEMWINDOWS_ASYNC
:
1043 case RPCRDMA_MEMWINDOWS
:
1044 /* Allocate one extra request's worth, for full cycling */
1045 for (i
= (buf
->rb_max_requests
+1) * RPCRDMA_MAX_SEGS
; i
; i
--) {
1046 r
->r
.mw
= ib_alloc_mw(ia
->ri_pd
);
1047 if (IS_ERR(r
->r
.mw
)) {
1048 rc
= PTR_ERR(r
->r
.mw
);
1049 dprintk("RPC: %s: ib_alloc_mw"
1050 " failed %i\n", __func__
, rc
);
1053 list_add(&r
->mw_list
, &buf
->rb_mws
);
1062 * Allocate/init the request/reply buffers. Doing this
1063 * using kmalloc for now -- one for each buf.
1065 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1066 struct rpcrdma_req
*req
;
1067 struct rpcrdma_rep
*rep
;
1069 len
= cdata
->inline_wsize
+ sizeof(struct rpcrdma_req
);
1070 /* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */
1071 /* Typical ~2400b, so rounding up saves work later */
1074 req
= kmalloc(len
, GFP_KERNEL
);
1076 dprintk("RPC: %s: request buffer %d alloc"
1077 " failed\n", __func__
, i
);
1081 memset(req
, 0, sizeof(struct rpcrdma_req
));
1082 buf
->rb_send_bufs
[i
] = req
;
1083 buf
->rb_send_bufs
[i
]->rl_buffer
= buf
;
1085 rc
= rpcrdma_register_internal(ia
, req
->rl_base
,
1086 len
- offsetof(struct rpcrdma_req
, rl_base
),
1087 &buf
->rb_send_bufs
[i
]->rl_handle
,
1088 &buf
->rb_send_bufs
[i
]->rl_iov
);
1092 buf
->rb_send_bufs
[i
]->rl_size
= len
-sizeof(struct rpcrdma_req
);
1094 len
= cdata
->inline_rsize
+ sizeof(struct rpcrdma_rep
);
1095 rep
= kmalloc(len
, GFP_KERNEL
);
1097 dprintk("RPC: %s: reply buffer %d alloc failed\n",
1102 memset(rep
, 0, sizeof(struct rpcrdma_rep
));
1103 buf
->rb_recv_bufs
[i
] = rep
;
1104 buf
->rb_recv_bufs
[i
]->rr_buffer
= buf
;
1105 init_waitqueue_head(&rep
->rr_unbind
);
1107 rc
= rpcrdma_register_internal(ia
, rep
->rr_base
,
1108 len
- offsetof(struct rpcrdma_rep
, rr_base
),
1109 &buf
->rb_recv_bufs
[i
]->rr_handle
,
1110 &buf
->rb_recv_bufs
[i
]->rr_iov
);
1115 dprintk("RPC: %s: max_requests %d\n",
1116 __func__
, buf
->rb_max_requests
);
1120 rpcrdma_buffer_destroy(buf
);
1125 * Unregister and destroy buffer memory. Need to deal with
1126 * partial initialization, so it's callable from failed create.
1127 * Must be called before destroying endpoint, as registrations
1131 rpcrdma_buffer_destroy(struct rpcrdma_buffer
*buf
)
1134 struct rpcrdma_ia
*ia
= rdmab_to_ia(buf
);
1135 struct rpcrdma_mw
*r
;
1137 /* clean up in reverse order from create
1138 * 1. recv mr memory (mr free, then kfree)
1139 * 1a. bind mw memory
1140 * 2. send mr memory (mr free, then kfree)
1141 * 3. padding (if any) [moved to rpcrdma_ep_destroy]
1144 dprintk("RPC: %s: entering\n", __func__
);
1146 for (i
= 0; i
< buf
->rb_max_requests
; i
++) {
1147 if (buf
->rb_recv_bufs
&& buf
->rb_recv_bufs
[i
]) {
1148 rpcrdma_deregister_internal(ia
,
1149 buf
->rb_recv_bufs
[i
]->rr_handle
,
1150 &buf
->rb_recv_bufs
[i
]->rr_iov
);
1151 kfree(buf
->rb_recv_bufs
[i
]);
1153 if (buf
->rb_send_bufs
&& buf
->rb_send_bufs
[i
]) {
1154 while (!list_empty(&buf
->rb_mws
)) {
1155 r
= list_entry(buf
->rb_mws
.next
,
1156 struct rpcrdma_mw
, mw_list
);
1157 list_del(&r
->mw_list
);
1158 switch (ia
->ri_memreg_strategy
) {
1160 rc
= ib_dereg_mr(r
->r
.frmr
.fr_mr
);
1166 ib_free_fast_reg_page_list(r
->r
.frmr
.fr_pgl
);
1168 case RPCRDMA_MTHCAFMR
:
1169 rc
= ib_dealloc_fmr(r
->r
.fmr
);
1176 case RPCRDMA_MEMWINDOWS_ASYNC
:
1177 case RPCRDMA_MEMWINDOWS
:
1178 rc
= ib_dealloc_mw(r
->r
.mw
);
1189 rpcrdma_deregister_internal(ia
,
1190 buf
->rb_send_bufs
[i
]->rl_handle
,
1191 &buf
->rb_send_bufs
[i
]->rl_iov
);
1192 kfree(buf
->rb_send_bufs
[i
]);
1196 kfree(buf
->rb_pool
);
1200 * Get a set of request/reply buffers.
1202 * Reply buffer (if needed) is attached to send buffer upon return.
1204 * rb_send_index and rb_recv_index MUST always be pointing to the
1205 * *next* available buffer (non-NULL). They are incremented after
1206 * removing buffers, and decremented *before* returning them.
1208 struct rpcrdma_req
*
1209 rpcrdma_buffer_get(struct rpcrdma_buffer
*buffers
)
1211 struct rpcrdma_req
*req
;
1212 unsigned long flags
;
1214 struct rpcrdma_mw
*r
;
1216 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1217 if (buffers
->rb_send_index
== buffers
->rb_max_requests
) {
1218 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1219 dprintk("RPC: %s: out of request buffers\n", __func__
);
1220 return ((struct rpcrdma_req
*)NULL
);
1223 req
= buffers
->rb_send_bufs
[buffers
->rb_send_index
];
1224 if (buffers
->rb_send_index
< buffers
->rb_recv_index
) {
1225 dprintk("RPC: %s: %d extra receives outstanding (ok)\n",
1227 buffers
->rb_recv_index
- buffers
->rb_send_index
);
1228 req
->rl_reply
= NULL
;
1230 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1231 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1233 buffers
->rb_send_bufs
[buffers
->rb_send_index
++] = NULL
;
1234 if (!list_empty(&buffers
->rb_mws
)) {
1235 i
= RPCRDMA_MAX_SEGS
- 1;
1237 r
= list_entry(buffers
->rb_mws
.next
,
1238 struct rpcrdma_mw
, mw_list
);
1239 list_del(&r
->mw_list
);
1240 req
->rl_segments
[i
].mr_chunk
.rl_mw
= r
;
1243 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1248 * Put request/reply buffers back into pool.
1249 * Pre-decrement counter/array index.
1252 rpcrdma_buffer_put(struct rpcrdma_req
*req
)
1254 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1255 struct rpcrdma_ia
*ia
= rdmab_to_ia(buffers
);
1257 unsigned long flags
;
1259 BUG_ON(req
->rl_nchunks
!= 0);
1260 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1261 buffers
->rb_send_bufs
[--buffers
->rb_send_index
] = req
;
1263 if (req
->rl_reply
) {
1264 buffers
->rb_recv_bufs
[--buffers
->rb_recv_index
] = req
->rl_reply
;
1265 init_waitqueue_head(&req
->rl_reply
->rr_unbind
);
1266 req
->rl_reply
->rr_func
= NULL
;
1267 req
->rl_reply
= NULL
;
1269 switch (ia
->ri_memreg_strategy
) {
1271 case RPCRDMA_MTHCAFMR
:
1272 case RPCRDMA_MEMWINDOWS_ASYNC
:
1273 case RPCRDMA_MEMWINDOWS
:
1275 * Cycle mw's back in reverse order, and "spin" them.
1276 * This delays and scrambles reuse as much as possible.
1280 struct rpcrdma_mw
**mw
;
1281 mw
= &req
->rl_segments
[i
].mr_chunk
.rl_mw
;
1282 list_add_tail(&(*mw
)->mw_list
, &buffers
->rb_mws
);
1284 } while (++i
< RPCRDMA_MAX_SEGS
);
1285 list_add_tail(&req
->rl_segments
[0].mr_chunk
.rl_mw
->mw_list
,
1287 req
->rl_segments
[0].mr_chunk
.rl_mw
= NULL
;
1292 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1296 * Recover reply buffers from pool.
1297 * This happens when recovering from error conditions.
1298 * Post-increment counter/array index.
1301 rpcrdma_recv_buffer_get(struct rpcrdma_req
*req
)
1303 struct rpcrdma_buffer
*buffers
= req
->rl_buffer
;
1304 unsigned long flags
;
1306 if (req
->rl_iov
.length
== 0) /* special case xprt_rdma_allocate() */
1307 buffers
= ((struct rpcrdma_req
*) buffers
)->rl_buffer
;
1308 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1309 if (buffers
->rb_recv_index
< buffers
->rb_max_requests
) {
1310 req
->rl_reply
= buffers
->rb_recv_bufs
[buffers
->rb_recv_index
];
1311 buffers
->rb_recv_bufs
[buffers
->rb_recv_index
++] = NULL
;
1313 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1317 * Put reply buffers back into pool when not attached to
1318 * request. This happens in error conditions, and when
1319 * aborting unbinds. Pre-decrement counter/array index.
1322 rpcrdma_recv_buffer_put(struct rpcrdma_rep
*rep
)
1324 struct rpcrdma_buffer
*buffers
= rep
->rr_buffer
;
1325 unsigned long flags
;
1327 rep
->rr_func
= NULL
;
1328 spin_lock_irqsave(&buffers
->rb_lock
, flags
);
1329 buffers
->rb_recv_bufs
[--buffers
->rb_recv_index
] = rep
;
1330 spin_unlock_irqrestore(&buffers
->rb_lock
, flags
);
1334 * Wrappers for internal-use kmalloc memory registration, used by buffer code.
1338 rpcrdma_register_internal(struct rpcrdma_ia
*ia
, void *va
, int len
,
1339 struct ib_mr
**mrp
, struct ib_sge
*iov
)
1341 struct ib_phys_buf ipb
;
1346 * All memory passed here was kmalloc'ed, therefore phys-contiguous.
1348 iov
->addr
= ib_dma_map_single(ia
->ri_id
->device
,
1349 va
, len
, DMA_BIDIRECTIONAL
);
1352 if (ia
->ri_have_dma_lkey
) {
1354 iov
->lkey
= ia
->ri_dma_lkey
;
1356 } else if (ia
->ri_bind_mem
!= NULL
) {
1358 iov
->lkey
= ia
->ri_bind_mem
->lkey
;
1362 ipb
.addr
= iov
->addr
;
1363 ipb
.size
= iov
->length
;
1364 mr
= ib_reg_phys_mr(ia
->ri_pd
, &ipb
, 1,
1365 IB_ACCESS_LOCAL_WRITE
, &iov
->addr
);
1367 dprintk("RPC: %s: phys convert: 0x%llx "
1368 "registered 0x%llx length %d\n",
1369 __func__
, (unsigned long long)ipb
.addr
,
1370 (unsigned long long)iov
->addr
, len
);
1375 dprintk("RPC: %s: failed with %i\n", __func__
, rc
);
1378 iov
->lkey
= mr
->lkey
;
1386 rpcrdma_deregister_internal(struct rpcrdma_ia
*ia
,
1387 struct ib_mr
*mr
, struct ib_sge
*iov
)
1391 ib_dma_unmap_single(ia
->ri_id
->device
,
1392 iov
->addr
, iov
->length
, DMA_BIDIRECTIONAL
);
1397 rc
= ib_dereg_mr(mr
);
1399 dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__
, rc
);
1404 * Wrappers for chunk registration, shared by read/write chunk code.
1408 rpcrdma_map_one(struct rpcrdma_ia
*ia
, struct rpcrdma_mr_seg
*seg
, int writing
)
1410 seg
->mr_dir
= writing
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
1411 seg
->mr_dmalen
= seg
->mr_len
;
1413 seg
->mr_dma
= ib_dma_map_page(ia
->ri_id
->device
,
1414 seg
->mr_page
, offset_in_page(seg
->mr_offset
),
1415 seg
->mr_dmalen
, seg
->mr_dir
);
1417 seg
->mr_dma
= ib_dma_map_single(ia
->ri_id
->device
,
1419 seg
->mr_dmalen
, seg
->mr_dir
);
1423 rpcrdma_unmap_one(struct rpcrdma_ia
*ia
, struct rpcrdma_mr_seg
*seg
)
1426 ib_dma_unmap_page(ia
->ri_id
->device
,
1427 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
1429 ib_dma_unmap_single(ia
->ri_id
->device
,
1430 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
1434 rpcrdma_register_frmr_external(struct rpcrdma_mr_seg
*seg
,
1435 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
,
1436 struct rpcrdma_xprt
*r_xprt
)
1438 struct rpcrdma_mr_seg
*seg1
= seg
;
1439 struct ib_send_wr frmr_wr
, *bad_wr
;
1444 pageoff
= offset_in_page(seg1
->mr_offset
);
1445 seg1
->mr_offset
-= pageoff
; /* start of page */
1446 seg1
->mr_len
+= pageoff
;
1448 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1449 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1450 for (i
= 0; i
< *nsegs
;) {
1451 rpcrdma_map_one(ia
, seg
, writing
);
1452 seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_pgl
->page_list
[i
] = seg
->mr_dma
;
1456 /* Check for holes */
1457 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1458 offset_in_page((seg
-1)->mr_offset
+ (seg
-1)->mr_len
))
1461 dprintk("RPC: %s: Using frmr %p to map %d segments\n",
1462 __func__
, seg1
->mr_chunk
.rl_mw
, i
);
1465 key
= (u8
)(seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
& 0x000000FF);
1466 ib_update_fast_reg_key(seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
, ++key
);
1468 /* Prepare FRMR WR */
1469 memset(&frmr_wr
, 0, sizeof frmr_wr
);
1470 frmr_wr
.opcode
= IB_WR_FAST_REG_MR
;
1471 frmr_wr
.send_flags
= 0; /* unsignaled */
1472 frmr_wr
.wr
.fast_reg
.iova_start
= (unsigned long)seg1
->mr_dma
;
1473 frmr_wr
.wr
.fast_reg
.page_list
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_pgl
;
1474 frmr_wr
.wr
.fast_reg
.page_list_len
= i
;
1475 frmr_wr
.wr
.fast_reg
.page_shift
= PAGE_SHIFT
;
1476 frmr_wr
.wr
.fast_reg
.length
= i
<< PAGE_SHIFT
;
1477 frmr_wr
.wr
.fast_reg
.access_flags
= (writing
?
1478 IB_ACCESS_REMOTE_WRITE
: IB_ACCESS_REMOTE_READ
);
1479 frmr_wr
.wr
.fast_reg
.rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1480 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1482 rc
= ib_post_send(ia
->ri_id
->qp
, &frmr_wr
, &bad_wr
);
1485 dprintk("RPC: %s: failed ib_post_send for register,"
1486 " status %i\n", __func__
, rc
);
1488 rpcrdma_unmap_one(ia
, --seg
);
1490 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1491 seg1
->mr_base
= seg1
->mr_dma
+ pageoff
;
1500 rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg
*seg
,
1501 struct rpcrdma_ia
*ia
, struct rpcrdma_xprt
*r_xprt
)
1503 struct rpcrdma_mr_seg
*seg1
= seg
;
1504 struct ib_send_wr invalidate_wr
, *bad_wr
;
1507 while (seg1
->mr_nsegs
--)
1508 rpcrdma_unmap_one(ia
, seg
++);
1510 memset(&invalidate_wr
, 0, sizeof invalidate_wr
);
1511 invalidate_wr
.opcode
= IB_WR_LOCAL_INV
;
1512 invalidate_wr
.send_flags
= 0; /* unsignaled */
1513 invalidate_wr
.ex
.invalidate_rkey
= seg1
->mr_chunk
.rl_mw
->r
.frmr
.fr_mr
->rkey
;
1514 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1516 rc
= ib_post_send(ia
->ri_id
->qp
, &invalidate_wr
, &bad_wr
);
1518 dprintk("RPC: %s: failed ib_post_send for invalidate,"
1519 " status %i\n", __func__
, rc
);
1524 rpcrdma_register_fmr_external(struct rpcrdma_mr_seg
*seg
,
1525 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
)
1527 struct rpcrdma_mr_seg
*seg1
= seg
;
1528 u64 physaddrs
[RPCRDMA_MAX_DATA_SEGS
];
1529 int len
, pageoff
, i
, rc
;
1531 pageoff
= offset_in_page(seg1
->mr_offset
);
1532 seg1
->mr_offset
-= pageoff
; /* start of page */
1533 seg1
->mr_len
+= pageoff
;
1535 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1536 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1537 for (i
= 0; i
< *nsegs
;) {
1538 rpcrdma_map_one(ia
, seg
, writing
);
1539 physaddrs
[i
] = seg
->mr_dma
;
1543 /* Check for holes */
1544 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1545 offset_in_page((seg
-1)->mr_offset
+ (seg
-1)->mr_len
))
1548 rc
= ib_map_phys_fmr(seg1
->mr_chunk
.rl_mw
->r
.fmr
,
1549 physaddrs
, i
, seg1
->mr_dma
);
1551 dprintk("RPC: %s: failed ib_map_phys_fmr "
1552 "%u@0x%llx+%i (%d)... status %i\n", __func__
,
1553 len
, (unsigned long long)seg1
->mr_dma
,
1556 rpcrdma_unmap_one(ia
, --seg
);
1558 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mw
->r
.fmr
->rkey
;
1559 seg1
->mr_base
= seg1
->mr_dma
+ pageoff
;
1568 rpcrdma_deregister_fmr_external(struct rpcrdma_mr_seg
*seg
,
1569 struct rpcrdma_ia
*ia
)
1571 struct rpcrdma_mr_seg
*seg1
= seg
;
1575 list_add(&seg1
->mr_chunk
.rl_mw
->r
.fmr
->list
, &l
);
1576 rc
= ib_unmap_fmr(&l
);
1577 while (seg1
->mr_nsegs
--)
1578 rpcrdma_unmap_one(ia
, seg
++);
1580 dprintk("RPC: %s: failed ib_unmap_fmr,"
1581 " status %i\n", __func__
, rc
);
1586 rpcrdma_register_memwin_external(struct rpcrdma_mr_seg
*seg
,
1587 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
,
1588 struct rpcrdma_xprt
*r_xprt
)
1590 int mem_priv
= (writing
? IB_ACCESS_REMOTE_WRITE
:
1591 IB_ACCESS_REMOTE_READ
);
1592 struct ib_mw_bind param
;
1596 rpcrdma_map_one(ia
, seg
, writing
);
1597 param
.mr
= ia
->ri_bind_mem
;
1598 param
.wr_id
= 0ULL; /* no send cookie */
1599 param
.addr
= seg
->mr_dma
;
1600 param
.length
= seg
->mr_len
;
1601 param
.send_flags
= 0;
1602 param
.mw_access_flags
= mem_priv
;
1604 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1605 rc
= ib_bind_mw(ia
->ri_id
->qp
, seg
->mr_chunk
.rl_mw
->r
.mw
, ¶m
);
1607 dprintk("RPC: %s: failed ib_bind_mw "
1608 "%u@0x%llx status %i\n",
1609 __func__
, seg
->mr_len
,
1610 (unsigned long long)seg
->mr_dma
, rc
);
1611 rpcrdma_unmap_one(ia
, seg
);
1613 seg
->mr_rkey
= seg
->mr_chunk
.rl_mw
->r
.mw
->rkey
;
1614 seg
->mr_base
= param
.addr
;
1621 rpcrdma_deregister_memwin_external(struct rpcrdma_mr_seg
*seg
,
1622 struct rpcrdma_ia
*ia
,
1623 struct rpcrdma_xprt
*r_xprt
, void **r
)
1625 struct ib_mw_bind param
;
1629 BUG_ON(seg
->mr_nsegs
!= 1);
1630 param
.mr
= ia
->ri_bind_mem
;
1631 param
.addr
= 0ULL; /* unbind */
1633 param
.mw_access_flags
= 0;
1635 param
.wr_id
= (u64
) (unsigned long) *r
;
1636 param
.send_flags
= IB_SEND_SIGNALED
;
1637 INIT_CQCOUNT(&r_xprt
->rx_ep
);
1640 param
.send_flags
= 0;
1641 DECR_CQCOUNT(&r_xprt
->rx_ep
);
1643 rc
= ib_bind_mw(ia
->ri_id
->qp
, seg
->mr_chunk
.rl_mw
->r
.mw
, ¶m
);
1644 rpcrdma_unmap_one(ia
, seg
);
1646 dprintk("RPC: %s: failed ib_(un)bind_mw,"
1647 " status %i\n", __func__
, rc
);
1649 *r
= NULL
; /* will upcall on completion */
1654 rpcrdma_register_default_external(struct rpcrdma_mr_seg
*seg
,
1655 int *nsegs
, int writing
, struct rpcrdma_ia
*ia
)
1657 int mem_priv
= (writing
? IB_ACCESS_REMOTE_WRITE
:
1658 IB_ACCESS_REMOTE_READ
);
1659 struct rpcrdma_mr_seg
*seg1
= seg
;
1660 struct ib_phys_buf ipb
[RPCRDMA_MAX_DATA_SEGS
];
1663 if (*nsegs
> RPCRDMA_MAX_DATA_SEGS
)
1664 *nsegs
= RPCRDMA_MAX_DATA_SEGS
;
1665 for (len
= 0, i
= 0; i
< *nsegs
;) {
1666 rpcrdma_map_one(ia
, seg
, writing
);
1667 ipb
[i
].addr
= seg
->mr_dma
;
1668 ipb
[i
].size
= seg
->mr_len
;
1672 /* Check for holes */
1673 if ((i
< *nsegs
&& offset_in_page(seg
->mr_offset
)) ||
1674 offset_in_page((seg
-1)->mr_offset
+(seg
-1)->mr_len
))
1677 seg1
->mr_base
= seg1
->mr_dma
;
1678 seg1
->mr_chunk
.rl_mr
= ib_reg_phys_mr(ia
->ri_pd
,
1679 ipb
, i
, mem_priv
, &seg1
->mr_base
);
1680 if (IS_ERR(seg1
->mr_chunk
.rl_mr
)) {
1681 rc
= PTR_ERR(seg1
->mr_chunk
.rl_mr
);
1682 dprintk("RPC: %s: failed ib_reg_phys_mr "
1683 "%u@0x%llx (%d)... status %i\n",
1685 (unsigned long long)seg1
->mr_dma
, i
, rc
);
1687 rpcrdma_unmap_one(ia
, --seg
);
1689 seg1
->mr_rkey
= seg1
->mr_chunk
.rl_mr
->rkey
;
1698 rpcrdma_deregister_default_external(struct rpcrdma_mr_seg
*seg
,
1699 struct rpcrdma_ia
*ia
)
1701 struct rpcrdma_mr_seg
*seg1
= seg
;
1704 rc
= ib_dereg_mr(seg1
->mr_chunk
.rl_mr
);
1705 seg1
->mr_chunk
.rl_mr
= NULL
;
1706 while (seg1
->mr_nsegs
--)
1707 rpcrdma_unmap_one(ia
, seg
++);
1709 dprintk("RPC: %s: failed ib_dereg_mr,"
1710 " status %i\n", __func__
, rc
);
1715 rpcrdma_register_external(struct rpcrdma_mr_seg
*seg
,
1716 int nsegs
, int writing
, struct rpcrdma_xprt
*r_xprt
)
1718 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
1721 switch (ia
->ri_memreg_strategy
) {
1723 #if RPCRDMA_PERSISTENT_REGISTRATION
1724 case RPCRDMA_ALLPHYSICAL
:
1725 rpcrdma_map_one(ia
, seg
, writing
);
1726 seg
->mr_rkey
= ia
->ri_bind_mem
->rkey
;
1727 seg
->mr_base
= seg
->mr_dma
;
1733 /* Registration using frmr registration */
1735 rc
= rpcrdma_register_frmr_external(seg
, &nsegs
, writing
, ia
, r_xprt
);
1738 /* Registration using fmr memory registration */
1739 case RPCRDMA_MTHCAFMR
:
1740 rc
= rpcrdma_register_fmr_external(seg
, &nsegs
, writing
, ia
);
1743 /* Registration using memory windows */
1744 case RPCRDMA_MEMWINDOWS_ASYNC
:
1745 case RPCRDMA_MEMWINDOWS
:
1746 rc
= rpcrdma_register_memwin_external(seg
, &nsegs
, writing
, ia
, r_xprt
);
1749 /* Default registration each time */
1751 rc
= rpcrdma_register_default_external(seg
, &nsegs
, writing
, ia
);
1761 rpcrdma_deregister_external(struct rpcrdma_mr_seg
*seg
,
1762 struct rpcrdma_xprt
*r_xprt
, void *r
)
1764 struct rpcrdma_ia
*ia
= &r_xprt
->rx_ia
;
1765 int nsegs
= seg
->mr_nsegs
, rc
;
1767 switch (ia
->ri_memreg_strategy
) {
1769 #if RPCRDMA_PERSISTENT_REGISTRATION
1770 case RPCRDMA_ALLPHYSICAL
:
1772 rpcrdma_unmap_one(ia
, seg
);
1778 rc
= rpcrdma_deregister_frmr_external(seg
, ia
, r_xprt
);
1781 case RPCRDMA_MTHCAFMR
:
1782 rc
= rpcrdma_deregister_fmr_external(seg
, ia
);
1785 case RPCRDMA_MEMWINDOWS_ASYNC
:
1786 case RPCRDMA_MEMWINDOWS
:
1787 rc
= rpcrdma_deregister_memwin_external(seg
, ia
, r_xprt
, &r
);
1791 rc
= rpcrdma_deregister_default_external(seg
, ia
);
1795 struct rpcrdma_rep
*rep
= r
;
1796 void (*func
)(struct rpcrdma_rep
*) = rep
->rr_func
;
1797 rep
->rr_func
= NULL
;
1798 func(rep
); /* dereg done, callback now */
1804 * Prepost any receive buffer, then post send.
1806 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1809 rpcrdma_ep_post(struct rpcrdma_ia
*ia
,
1810 struct rpcrdma_ep
*ep
,
1811 struct rpcrdma_req
*req
)
1813 struct ib_send_wr send_wr
, *send_wr_fail
;
1814 struct rpcrdma_rep
*rep
= req
->rl_reply
;
1818 rc
= rpcrdma_ep_post_recv(ia
, ep
, rep
);
1821 req
->rl_reply
= NULL
;
1824 send_wr
.next
= NULL
;
1825 send_wr
.wr_id
= 0ULL; /* no send cookie */
1826 send_wr
.sg_list
= req
->rl_send_iov
;
1827 send_wr
.num_sge
= req
->rl_niovs
;
1828 send_wr
.opcode
= IB_WR_SEND
;
1829 if (send_wr
.num_sge
== 4) /* no need to sync any pad (constant) */
1830 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1831 req
->rl_send_iov
[3].addr
, req
->rl_send_iov
[3].length
,
1833 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1834 req
->rl_send_iov
[1].addr
, req
->rl_send_iov
[1].length
,
1836 ib_dma_sync_single_for_device(ia
->ri_id
->device
,
1837 req
->rl_send_iov
[0].addr
, req
->rl_send_iov
[0].length
,
1840 if (DECR_CQCOUNT(ep
) > 0)
1841 send_wr
.send_flags
= 0;
1842 else { /* Provider must take a send completion every now and then */
1844 send_wr
.send_flags
= IB_SEND_SIGNALED
;
1847 rc
= ib_post_send(ia
->ri_id
->qp
, &send_wr
, &send_wr_fail
);
1849 dprintk("RPC: %s: ib_post_send returned %i\n", __func__
,
1856 * (Re)post a receive buffer.
1859 rpcrdma_ep_post_recv(struct rpcrdma_ia
*ia
,
1860 struct rpcrdma_ep
*ep
,
1861 struct rpcrdma_rep
*rep
)
1863 struct ib_recv_wr recv_wr
, *recv_wr_fail
;
1866 recv_wr
.next
= NULL
;
1867 recv_wr
.wr_id
= (u64
) (unsigned long) rep
;
1868 recv_wr
.sg_list
= &rep
->rr_iov
;
1869 recv_wr
.num_sge
= 1;
1871 ib_dma_sync_single_for_cpu(ia
->ri_id
->device
,
1872 rep
->rr_iov
.addr
, rep
->rr_iov
.length
, DMA_BIDIRECTIONAL
);
1875 rc
= ib_post_recv(ia
->ri_id
->qp
, &recv_wr
, &recv_wr_fail
);
1878 dprintk("RPC: %s: ib_post_recv returned %i\n", __func__
,