2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
17 * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
22 * Neither the name of the Network Appliance, Inc. nor the names of
23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 * Encapsulates the major functions managing:
50 #include <linux/interrupt.h>
51 #include <linux/slab.h>
52 #include <linux/prefetch.h>
53 #include <linux/sunrpc/addr.h>
54 #include <asm/bitops.h>
56 #include "xprt_rdma.h"
62 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
63 # define RPCDBG_FACILITY RPCDBG_TRANS
71 * handle replies in tasklet context, using a single, global list
72 * rdma tasklet function -- just turn around and call the func
73 * for all replies on the list
76 static DEFINE_SPINLOCK(rpcrdma_tk_lock_g);
77 static LIST_HEAD(rpcrdma_tasklets_g);
80 rpcrdma_run_tasklet(unsigned long data)
82 struct rpcrdma_rep *rep;
83 void (*func)(struct rpcrdma_rep *);
87 spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
88 while (!list_empty(&rpcrdma_tasklets_g)) {
89 rep = list_entry(rpcrdma_tasklets_g.next,
90 struct rpcrdma_rep, rr_list);
91 list_del(&rep->rr_list);
94 spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
99 rpcrdma_recv_buffer_put(rep);
101 spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
103 spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
106 static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL);
109 rpcrdma_schedule_tasklet(struct list_head *sched_list)
113 spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
114 list_splice_tail(sched_list, &rpcrdma_tasklets_g);
115 spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
116 tasklet_schedule(&rpcrdma_tasklet_g);
120 rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
122 struct rpcrdma_ep *ep = context;
124 pr_err("RPC: %s: %s on device %s ep %p\n",
125 __func__, ib_event_msg(event->event),
126 event->device->name, context);
127 if (ep->rep_connected == 1) {
128 ep->rep_connected = -EIO;
129 rpcrdma_conn_func(ep);
130 wake_up_all(&ep->rep_connect_wait);
135 rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
137 struct rpcrdma_ep *ep = context;
139 pr_err("RPC: %s: %s on device %s ep %p\n",
140 __func__, ib_event_msg(event->event),
141 event->device->name, context);
142 if (ep->rep_connected == 1) {
143 ep->rep_connected = -EIO;
144 rpcrdma_conn_func(ep);
145 wake_up_all(&ep->rep_connect_wait);
150 rpcrdma_sendcq_process_wc(struct ib_wc *wc)
152 /* WARNING: Only wr_id and status are reliable at this point */
153 if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) {
154 if (wc->status != IB_WC_SUCCESS &&
155 wc->status != IB_WC_WR_FLUSH_ERR)
156 pr_err("RPC: %s: SEND: %s\n",
157 __func__, ib_wc_status_msg(wc->status));
159 struct rpcrdma_mw *r;
161 r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
162 r->mw_sendcompletion(wc);
167 rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
170 int budget, count, rc;
172 budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
174 wcs = ep->rep_send_wcs;
176 rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
182 rpcrdma_sendcq_process_wc(wcs++);
183 } while (rc == RPCRDMA_POLLSIZE && --budget);
188 * Handle send, fast_reg_mr, and local_inv completions.
190 * Send events are typically suppressed and thus do not result
191 * in an upcall. Occasionally one is signaled, however. This
192 * prevents the provider's completion queue from wrapping and
193 * losing a completion.
196 rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context)
198 struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
201 rc = rpcrdma_sendcq_poll(cq, ep);
203 dprintk("RPC: %s: ib_poll_cq failed: %i\n",
208 rc = ib_req_notify_cq(cq,
209 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
213 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
218 rpcrdma_sendcq_poll(cq, ep);
222 rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list)
224 struct rpcrdma_rep *rep =
225 (struct rpcrdma_rep *)(unsigned long)wc->wr_id;
227 /* WARNING: Only wr_id and status are reliable at this point */
228 if (wc->status != IB_WC_SUCCESS)
231 /* status == SUCCESS means all fields in wc are trustworthy */
232 if (wc->opcode != IB_WC_RECV)
235 dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
236 __func__, rep, wc->byte_len);
238 rep->rr_len = wc->byte_len;
239 ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device,
240 rdmab_addr(rep->rr_rdmabuf),
241 rep->rr_len, DMA_FROM_DEVICE);
242 prefetch(rdmab_to_msg(rep->rr_rdmabuf));
245 list_add_tail(&rep->rr_list, sched_list);
248 if (wc->status != IB_WC_WR_FLUSH_ERR)
249 pr_err("RPC: %s: rep %p: %s\n",
250 __func__, rep, ib_wc_status_msg(wc->status));
256 rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
258 struct list_head sched_list;
260 int budget, count, rc;
262 INIT_LIST_HEAD(&sched_list);
263 budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
265 wcs = ep->rep_recv_wcs;
267 rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
273 rpcrdma_recvcq_process_wc(wcs++, &sched_list);
274 } while (rc == RPCRDMA_POLLSIZE && --budget);
278 rpcrdma_schedule_tasklet(&sched_list);
283 * Handle receive completions.
285 * It is reentrant but processes single events in order to maintain
286 * ordering of receives to keep server credits.
288 * It is the responsibility of the scheduled tasklet to return
289 * recv buffers to the pool. NOTE: this affects synchronization of
290 * connection shutdown. That is, the structures required for
291 * the completion of the reply handler must remain intact until
292 * all memory has been reclaimed.
295 rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context)
297 struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
300 rc = rpcrdma_recvcq_poll(cq, ep);
302 dprintk("RPC: %s: ib_poll_cq failed: %i\n",
307 rc = ib_req_notify_cq(cq,
308 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
312 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
317 rpcrdma_recvcq_poll(cq, ep);
321 rpcrdma_flush_cqs(struct rpcrdma_ep *ep)
324 LIST_HEAD(sched_list);
326 while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0)
327 rpcrdma_recvcq_process_wc(&wc, &sched_list);
328 if (!list_empty(&sched_list))
329 rpcrdma_schedule_tasklet(&sched_list);
330 while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0)
331 rpcrdma_sendcq_process_wc(&wc);
335 rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
337 struct rpcrdma_xprt *xprt = id->context;
338 struct rpcrdma_ia *ia = &xprt->rx_ia;
339 struct rpcrdma_ep *ep = &xprt->rx_ep;
340 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
341 struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr;
343 struct ib_qp_attr *attr = &ia->ri_qp_attr;
344 struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
347 switch (event->event) {
348 case RDMA_CM_EVENT_ADDR_RESOLVED:
349 case RDMA_CM_EVENT_ROUTE_RESOLVED:
351 complete(&ia->ri_done);
353 case RDMA_CM_EVENT_ADDR_ERROR:
354 ia->ri_async_rc = -EHOSTUNREACH;
355 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
357 complete(&ia->ri_done);
359 case RDMA_CM_EVENT_ROUTE_ERROR:
360 ia->ri_async_rc = -ENETUNREACH;
361 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
363 complete(&ia->ri_done);
365 case RDMA_CM_EVENT_ESTABLISHED:
367 ib_query_qp(ia->ri_id->qp, attr,
368 IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
370 dprintk("RPC: %s: %d responder resources"
372 __func__, attr->max_dest_rd_atomic,
373 attr->max_rd_atomic);
375 case RDMA_CM_EVENT_CONNECT_ERROR:
376 connstate = -ENOTCONN;
378 case RDMA_CM_EVENT_UNREACHABLE:
379 connstate = -ENETDOWN;
381 case RDMA_CM_EVENT_REJECTED:
382 connstate = -ECONNREFUSED;
384 case RDMA_CM_EVENT_DISCONNECTED:
385 connstate = -ECONNABORTED;
387 case RDMA_CM_EVENT_DEVICE_REMOVAL:
390 dprintk("RPC: %s: %sconnected\n",
391 __func__, connstate > 0 ? "" : "dis");
392 ep->rep_connected = connstate;
393 rpcrdma_conn_func(ep);
394 wake_up_all(&ep->rep_connect_wait);
397 dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
398 __func__, sap, rpc_get_port(sap), ep,
399 rdma_event_msg(event->event));
403 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
404 if (connstate == 1) {
405 int ird = attr->max_dest_rd_atomic;
406 int tird = ep->rep_remote_cma.responder_resources;
408 pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
409 sap, rpc_get_port(sap),
410 ia->ri_id->device->name,
411 ia->ri_ops->ro_displayname,
412 xprt->rx_buf.rb_max_requests,
413 ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
414 } else if (connstate < 0) {
415 pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
416 sap, rpc_get_port(sap), connstate);
423 static struct rdma_cm_id *
424 rpcrdma_create_id(struct rpcrdma_xprt *xprt,
425 struct rpcrdma_ia *ia, struct sockaddr *addr)
427 struct rdma_cm_id *id;
430 init_completion(&ia->ri_done);
432 id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC);
435 dprintk("RPC: %s: rdma_create_id() failed %i\n",
440 ia->ri_async_rc = -ETIMEDOUT;
441 rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
443 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
447 wait_for_completion_interruptible_timeout(&ia->ri_done,
448 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
449 rc = ia->ri_async_rc;
453 ia->ri_async_rc = -ETIMEDOUT;
454 rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
456 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
460 wait_for_completion_interruptible_timeout(&ia->ri_done,
461 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
462 rc = ia->ri_async_rc;
474 * Drain any cq, prior to teardown.
477 rpcrdma_clean_cq(struct ib_cq *cq)
482 while (1 == ib_poll_cq(cq, 1, &wc))
486 dprintk("RPC: %s: flushed %d events (last 0x%x)\n",
487 __func__, count, wc.opcode);
491 * Exported functions.
495 * Open and initialize an Interface Adapter.
496 * o initializes fields of struct rpcrdma_ia, including
497 * interface and provider attributes and protection zone.
500 rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
503 struct rpcrdma_ia *ia = &xprt->rx_ia;
504 struct ib_device_attr *devattr = &ia->ri_devattr;
506 ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
507 if (IS_ERR(ia->ri_id)) {
508 rc = PTR_ERR(ia->ri_id);
512 ia->ri_pd = ib_alloc_pd(ia->ri_id->device);
513 if (IS_ERR(ia->ri_pd)) {
514 rc = PTR_ERR(ia->ri_pd);
515 dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
520 rc = ib_query_device(ia->ri_id->device, devattr);
522 dprintk("RPC: %s: ib_query_device failed %d\n",
527 if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) {
528 ia->ri_have_dma_lkey = 1;
529 ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey;
532 if (memreg == RPCRDMA_FRMR) {
533 /* Requires both frmr reg and local dma lkey */
534 if (((devattr->device_cap_flags &
535 (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) !=
536 (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) ||
537 (devattr->max_fast_reg_page_list_len == 0)) {
538 dprintk("RPC: %s: FRMR registration "
539 "not supported by HCA\n", __func__);
540 memreg = RPCRDMA_MTHCAFMR;
543 if (memreg == RPCRDMA_MTHCAFMR) {
544 if (!ia->ri_id->device->alloc_fmr) {
545 dprintk("RPC: %s: MTHCAFMR registration "
546 "not supported by HCA\n", __func__);
547 memreg = RPCRDMA_ALLPHYSICAL;
552 * Optionally obtain an underlying physical identity mapping in
553 * order to do a memory window-based bind. This base registration
554 * is protected from remote access - that is enabled only by binding
555 * for the specific bytes targeted during each RPC operation, and
556 * revoked after the corresponding completion similar to a storage
561 ia->ri_ops = &rpcrdma_frwr_memreg_ops;
563 case RPCRDMA_ALLPHYSICAL:
564 ia->ri_ops = &rpcrdma_physical_memreg_ops;
565 mem_priv = IB_ACCESS_LOCAL_WRITE |
566 IB_ACCESS_REMOTE_WRITE |
567 IB_ACCESS_REMOTE_READ;
569 case RPCRDMA_MTHCAFMR:
570 ia->ri_ops = &rpcrdma_fmr_memreg_ops;
571 if (ia->ri_have_dma_lkey)
573 mem_priv = IB_ACCESS_LOCAL_WRITE;
575 ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv);
576 if (IS_ERR(ia->ri_bind_mem)) {
577 printk(KERN_ALERT "%s: ib_get_dma_mr for "
578 "phys register failed with %lX\n",
579 __func__, PTR_ERR(ia->ri_bind_mem));
585 printk(KERN_ERR "RPC: Unsupported memory "
586 "registration mode: %d\n", memreg);
590 dprintk("RPC: %s: memory registration strategy is '%s'\n",
591 __func__, ia->ri_ops->ro_displayname);
593 /* Else will do memory reg/dereg for each chunk */
594 ia->ri_memreg_strategy = memreg;
596 rwlock_init(&ia->ri_qplock);
600 ib_dealloc_pd(ia->ri_pd);
603 rdma_destroy_id(ia->ri_id);
610 * Clean up/close an IA.
611 * o if event handles and PD have been initialized, free them.
615 rpcrdma_ia_close(struct rpcrdma_ia *ia)
619 dprintk("RPC: %s: entering\n", __func__);
620 if (ia->ri_bind_mem != NULL) {
621 rc = ib_dereg_mr(ia->ri_bind_mem);
622 dprintk("RPC: %s: ib_dereg_mr returned %i\n",
625 if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
627 rdma_destroy_qp(ia->ri_id);
628 rdma_destroy_id(ia->ri_id);
631 if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) {
632 rc = ib_dealloc_pd(ia->ri_pd);
633 dprintk("RPC: %s: ib_dealloc_pd returned %i\n",
639 * Create unconnected endpoint.
642 rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
643 struct rpcrdma_create_data_internal *cdata)
645 struct ib_device_attr *devattr = &ia->ri_devattr;
646 struct ib_cq *sendcq, *recvcq;
647 struct ib_cq_init_attr cq_attr = {};
650 /* check provider's send/recv wr limits */
651 if (cdata->max_requests > devattr->max_qp_wr)
652 cdata->max_requests = devattr->max_qp_wr;
654 ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
655 ep->rep_attr.qp_context = ep;
656 ep->rep_attr.srq = NULL;
657 ep->rep_attr.cap.max_send_wr = cdata->max_requests;
658 rc = ia->ri_ops->ro_open(ia, ep, cdata);
661 ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
662 ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2);
663 ep->rep_attr.cap.max_recv_sge = 1;
664 ep->rep_attr.cap.max_inline_data = 0;
665 ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
666 ep->rep_attr.qp_type = IB_QPT_RC;
667 ep->rep_attr.port_num = ~0;
669 if (cdata->padding) {
670 ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding,
672 if (IS_ERR(ep->rep_padbuf))
673 return PTR_ERR(ep->rep_padbuf);
675 ep->rep_padbuf = NULL;
677 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
678 "iovs: send %d recv %d\n",
680 ep->rep_attr.cap.max_send_wr,
681 ep->rep_attr.cap.max_recv_wr,
682 ep->rep_attr.cap.max_send_sge,
683 ep->rep_attr.cap.max_recv_sge);
685 /* set trigger for requesting send completion */
686 ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
687 if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS)
688 ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS;
689 else if (ep->rep_cqinit <= 2)
692 init_waitqueue_head(&ep->rep_connect_wait);
693 INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
695 cq_attr.cqe = ep->rep_attr.cap.max_send_wr + 1;
696 sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall,
697 rpcrdma_cq_async_error_upcall, ep, &cq_attr);
698 if (IS_ERR(sendcq)) {
699 rc = PTR_ERR(sendcq);
700 dprintk("RPC: %s: failed to create send CQ: %i\n",
705 rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP);
707 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
712 cq_attr.cqe = ep->rep_attr.cap.max_recv_wr + 1;
713 recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall,
714 rpcrdma_cq_async_error_upcall, ep, &cq_attr);
715 if (IS_ERR(recvcq)) {
716 rc = PTR_ERR(recvcq);
717 dprintk("RPC: %s: failed to create recv CQ: %i\n",
722 rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP);
724 dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
726 ib_destroy_cq(recvcq);
730 ep->rep_attr.send_cq = sendcq;
731 ep->rep_attr.recv_cq = recvcq;
733 /* Initialize cma parameters */
735 /* RPC/RDMA does not use private data */
736 ep->rep_remote_cma.private_data = NULL;
737 ep->rep_remote_cma.private_data_len = 0;
739 /* Client offers RDMA Read but does not initiate */
740 ep->rep_remote_cma.initiator_depth = 0;
741 if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */
742 ep->rep_remote_cma.responder_resources = 32;
744 ep->rep_remote_cma.responder_resources =
745 devattr->max_qp_rd_atom;
747 ep->rep_remote_cma.retry_count = 7;
748 ep->rep_remote_cma.flow_control = 0;
749 ep->rep_remote_cma.rnr_retry_count = 0;
754 err = ib_destroy_cq(sendcq);
756 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
759 rpcrdma_free_regbuf(ia, ep->rep_padbuf);
766 * Disconnect and destroy endpoint. After this, the only
767 * valid operations on the ep are to free it (if dynamically
768 * allocated) or re-create it.
771 rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
775 dprintk("RPC: %s: entering, connected is %d\n",
776 __func__, ep->rep_connected);
778 cancel_delayed_work_sync(&ep->rep_connect_worker);
781 rpcrdma_ep_disconnect(ep, ia);
782 rdma_destroy_qp(ia->ri_id);
783 ia->ri_id->qp = NULL;
786 rpcrdma_free_regbuf(ia, ep->rep_padbuf);
788 rpcrdma_clean_cq(ep->rep_attr.recv_cq);
789 rc = ib_destroy_cq(ep->rep_attr.recv_cq);
791 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
794 rpcrdma_clean_cq(ep->rep_attr.send_cq);
795 rc = ib_destroy_cq(ep->rep_attr.send_cq);
797 dprintk("RPC: %s: ib_destroy_cq returned %i\n",
802 * Connect unconnected endpoint.
805 rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
807 struct rdma_cm_id *id, *old;
811 if (ep->rep_connected != 0) {
812 struct rpcrdma_xprt *xprt;
814 dprintk("RPC: %s: reconnecting...\n", __func__);
816 rpcrdma_ep_disconnect(ep, ia);
817 rpcrdma_flush_cqs(ep);
819 xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
820 ia->ri_ops->ro_reset(xprt);
822 id = rpcrdma_create_id(xprt, ia,
823 (struct sockaddr *)&xprt->rx_data.addr);
828 /* TEMP TEMP TEMP - fail if new device:
829 * Deregister/remarshal *all* requests!
830 * Close and recreate adapter, pd, etc!
831 * Re-determine all attributes still sane!
832 * More stuff I haven't thought of!
835 if (ia->ri_id->device != id->device) {
836 printk("RPC: %s: can't reconnect on "
837 "different device!\n", __func__);
843 rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
845 dprintk("RPC: %s: rdma_create_qp failed %i\n",
852 write_lock(&ia->ri_qplock);
855 write_unlock(&ia->ri_qplock);
857 rdma_destroy_qp(old);
858 rdma_destroy_id(old);
860 dprintk("RPC: %s: connecting...\n", __func__);
861 rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
863 dprintk("RPC: %s: rdma_create_qp failed %i\n",
865 /* do not update ep->rep_connected */
870 ep->rep_connected = 0;
872 rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
874 dprintk("RPC: %s: rdma_connect() failed with %i\n",
879 wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
882 * Check state. A non-peer reject indicates no listener
883 * (ECONNREFUSED), which may be a transient state. All
884 * others indicate a transport condition which has already
885 * undergone a best-effort.
887 if (ep->rep_connected == -ECONNREFUSED &&
888 ++retry_count <= RDMA_CONNECT_RETRY_MAX) {
889 dprintk("RPC: %s: non-peer_reject, retry\n", __func__);
892 if (ep->rep_connected <= 0) {
893 /* Sometimes, the only way to reliably connect to remote
894 * CMs is to use same nonzero values for ORD and IRD. */
895 if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 &&
896 (ep->rep_remote_cma.responder_resources == 0 ||
897 ep->rep_remote_cma.initiator_depth !=
898 ep->rep_remote_cma.responder_resources)) {
899 if (ep->rep_remote_cma.responder_resources == 0)
900 ep->rep_remote_cma.responder_resources = 1;
901 ep->rep_remote_cma.initiator_depth =
902 ep->rep_remote_cma.responder_resources;
905 rc = ep->rep_connected;
907 dprintk("RPC: %s: connected\n", __func__);
912 ep->rep_connected = rc;
917 * rpcrdma_ep_disconnect
919 * This is separate from destroy to facilitate the ability
920 * to reconnect without recreating the endpoint.
922 * This call is not reentrant, and must not be made in parallel
923 * on the same endpoint.
926 rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
930 rpcrdma_flush_cqs(ep);
931 rc = rdma_disconnect(ia->ri_id);
933 /* returns without wait if not connected */
934 wait_event_interruptible(ep->rep_connect_wait,
935 ep->rep_connected != 1);
936 dprintk("RPC: %s: after wait, %sconnected\n", __func__,
937 (ep->rep_connected == 1) ? "still " : "dis");
939 dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc);
940 ep->rep_connected = rc;
944 static struct rpcrdma_req *
945 rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
947 struct rpcrdma_req *req;
949 req = kzalloc(sizeof(*req), GFP_KERNEL);
951 return ERR_PTR(-ENOMEM);
953 req->rl_buffer = &r_xprt->rx_buf;
957 static struct rpcrdma_rep *
958 rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
960 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
961 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
962 struct rpcrdma_rep *rep;
966 rep = kzalloc(sizeof(*rep), GFP_KERNEL);
970 rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize,
972 if (IS_ERR(rep->rr_rdmabuf)) {
973 rc = PTR_ERR(rep->rr_rdmabuf);
977 rep->rr_buffer = &r_xprt->rx_buf;
987 rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
989 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
990 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
991 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
996 buf->rb_max_requests = cdata->max_requests;
997 spin_lock_init(&buf->rb_lock);
1000 * 1. arrays for send and recv pointers
1001 * 2. arrays of struct rpcrdma_req to fill in pointers
1002 * 3. array of struct rpcrdma_rep for replies
1003 * Send/recv buffers in req/rep need to be registered
1005 len = buf->rb_max_requests *
1006 (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));
1008 p = kzalloc(len, GFP_KERNEL);
1010 dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
1015 buf->rb_pool = p; /* for freeing it later */
1017 buf->rb_send_bufs = (struct rpcrdma_req **) p;
1018 p = (char *) &buf->rb_send_bufs[buf->rb_max_requests];
1019 buf->rb_recv_bufs = (struct rpcrdma_rep **) p;
1020 p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests];
1022 rc = ia->ri_ops->ro_init(r_xprt);
1026 for (i = 0; i < buf->rb_max_requests; i++) {
1027 struct rpcrdma_req *req;
1028 struct rpcrdma_rep *rep;
1030 req = rpcrdma_create_req(r_xprt);
1032 dprintk("RPC: %s: request buffer %d alloc"
1033 " failed\n", __func__, i);
1037 buf->rb_send_bufs[i] = req;
1039 rep = rpcrdma_create_rep(r_xprt);
1041 dprintk("RPC: %s: reply buffer %d alloc failed\n",
1046 buf->rb_recv_bufs[i] = rep;
1051 rpcrdma_buffer_destroy(buf);
1056 rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep)
1061 rpcrdma_free_regbuf(ia, rep->rr_rdmabuf);
1066 rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
1071 rpcrdma_free_regbuf(ia, req->rl_sendbuf);
1072 rpcrdma_free_regbuf(ia, req->rl_rdmabuf);
1077 rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
1079 struct rpcrdma_ia *ia = rdmab_to_ia(buf);
1082 /* clean up in reverse order from create
1083 * 1. recv mr memory (mr free, then kfree)
1084 * 2. send mr memory (mr free, then kfree)
1087 dprintk("RPC: %s: entering\n", __func__);
1089 for (i = 0; i < buf->rb_max_requests; i++) {
1090 if (buf->rb_recv_bufs)
1091 rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]);
1092 if (buf->rb_send_bufs)
1093 rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]);
1096 ia->ri_ops->ro_destroy(buf);
1098 kfree(buf->rb_pool);
1101 /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving
1102 * some req segments uninitialized.
1105 rpcrdma_buffer_put_mr(struct rpcrdma_mw **mw, struct rpcrdma_buffer *buf)
1108 list_add_tail(&(*mw)->mw_list, &buf->rb_mws);
1113 /* Cycle mw's back in reverse order, and "spin" them.
1114 * This delays and scrambles reuse as much as possible.
1117 rpcrdma_buffer_put_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
1119 struct rpcrdma_mr_seg *seg = req->rl_segments;
1120 struct rpcrdma_mr_seg *seg1 = seg;
1123 for (i = 1, seg++; i < RPCRDMA_MAX_SEGS; seg++, i++)
1124 rpcrdma_buffer_put_mr(&seg->rl_mw, buf);
1125 rpcrdma_buffer_put_mr(&seg1->rl_mw, buf);
1129 rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
1131 buf->rb_send_bufs[--buf->rb_send_index] = req;
1133 if (req->rl_reply) {
1134 buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply;
1135 req->rl_reply->rr_func = NULL;
1136 req->rl_reply = NULL;
1140 /* rpcrdma_unmap_one() was already done during deregistration.
1141 * Redo only the ib_post_send().
1144 rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia)
1146 struct rpcrdma_xprt *r_xprt =
1147 container_of(ia, struct rpcrdma_xprt, rx_ia);
1148 struct ib_send_wr invalidate_wr, *bad_wr;
1151 dprintk("RPC: %s: FRMR %p is stale\n", __func__, r);
1153 /* When this FRMR is re-inserted into rb_mws, it is no longer stale */
1154 r->r.frmr.fr_state = FRMR_IS_INVALID;
1156 memset(&invalidate_wr, 0, sizeof(invalidate_wr));
1157 invalidate_wr.wr_id = (unsigned long)(void *)r;
1158 invalidate_wr.opcode = IB_WR_LOCAL_INV;
1159 invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey;
1160 DECR_CQCOUNT(&r_xprt->rx_ep);
1162 dprintk("RPC: %s: frmr %p invalidating rkey %08x\n",
1163 __func__, r, r->r.frmr.fr_mr->rkey);
1165 read_lock(&ia->ri_qplock);
1166 rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
1167 read_unlock(&ia->ri_qplock);
1169 /* Force rpcrdma_buffer_get() to retry */
1170 r->r.frmr.fr_state = FRMR_IS_STALE;
1171 dprintk("RPC: %s: ib_post_send failed, %i\n",
1177 rpcrdma_retry_flushed_linv(struct list_head *stale,
1178 struct rpcrdma_buffer *buf)
1180 struct rpcrdma_ia *ia = rdmab_to_ia(buf);
1181 struct list_head *pos;
1182 struct rpcrdma_mw *r;
1183 unsigned long flags;
1185 list_for_each(pos, stale) {
1186 r = list_entry(pos, struct rpcrdma_mw, mw_list);
1187 rpcrdma_retry_local_inv(r, ia);
1190 spin_lock_irqsave(&buf->rb_lock, flags);
1191 list_splice_tail(stale, &buf->rb_mws);
1192 spin_unlock_irqrestore(&buf->rb_lock, flags);
1195 static struct rpcrdma_req *
1196 rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf,
1197 struct list_head *stale)
1199 struct rpcrdma_mw *r;
1202 i = RPCRDMA_MAX_SEGS - 1;
1203 while (!list_empty(&buf->rb_mws)) {
1204 r = list_entry(buf->rb_mws.next,
1205 struct rpcrdma_mw, mw_list);
1206 list_del(&r->mw_list);
1207 if (r->r.frmr.fr_state == FRMR_IS_STALE) {
1208 list_add(&r->mw_list, stale);
1211 req->rl_segments[i].rl_mw = r;
1212 if (unlikely(i-- == 0))
1213 return req; /* Success */
1216 /* Not enough entries on rb_mws for this req */
1217 rpcrdma_buffer_put_sendbuf(req, buf);
1218 rpcrdma_buffer_put_mrs(req, buf);
1222 static struct rpcrdma_req *
1223 rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
1225 struct rpcrdma_mw *r;
1228 i = RPCRDMA_MAX_SEGS - 1;
1229 while (!list_empty(&buf->rb_mws)) {
1230 r = list_entry(buf->rb_mws.next,
1231 struct rpcrdma_mw, mw_list);
1232 list_del(&r->mw_list);
1233 req->rl_segments[i].rl_mw = r;
1234 if (unlikely(i-- == 0))
1235 return req; /* Success */
1238 /* Not enough entries on rb_mws for this req */
1239 rpcrdma_buffer_put_sendbuf(req, buf);
1240 rpcrdma_buffer_put_mrs(req, buf);
1245 * Get a set of request/reply buffers.
1247 * Reply buffer (if needed) is attached to send buffer upon return.
1249 * rb_send_index and rb_recv_index MUST always be pointing to the
1250 * *next* available buffer (non-NULL). They are incremented after
1251 * removing buffers, and decremented *before* returning them.
1253 struct rpcrdma_req *
1254 rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
1256 struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
1257 struct list_head stale;
1258 struct rpcrdma_req *req;
1259 unsigned long flags;
1261 spin_lock_irqsave(&buffers->rb_lock, flags);
1262 if (buffers->rb_send_index == buffers->rb_max_requests) {
1263 spin_unlock_irqrestore(&buffers->rb_lock, flags);
1264 dprintk("RPC: %s: out of request buffers\n", __func__);
1265 return ((struct rpcrdma_req *)NULL);
1268 req = buffers->rb_send_bufs[buffers->rb_send_index];
1269 if (buffers->rb_send_index < buffers->rb_recv_index) {
1270 dprintk("RPC: %s: %d extra receives outstanding (ok)\n",
1272 buffers->rb_recv_index - buffers->rb_send_index);
1273 req->rl_reply = NULL;
1275 req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
1276 buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
1278 buffers->rb_send_bufs[buffers->rb_send_index++] = NULL;
1280 INIT_LIST_HEAD(&stale);
1281 switch (ia->ri_memreg_strategy) {
1283 req = rpcrdma_buffer_get_frmrs(req, buffers, &stale);
1285 case RPCRDMA_MTHCAFMR:
1286 req = rpcrdma_buffer_get_fmrs(req, buffers);
1291 spin_unlock_irqrestore(&buffers->rb_lock, flags);
1292 if (!list_empty(&stale))
1293 rpcrdma_retry_flushed_linv(&stale, buffers);
1298 * Put request/reply buffers back into pool.
1299 * Pre-decrement counter/array index.
1302 rpcrdma_buffer_put(struct rpcrdma_req *req)
1304 struct rpcrdma_buffer *buffers = req->rl_buffer;
1305 struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
1306 unsigned long flags;
1308 spin_lock_irqsave(&buffers->rb_lock, flags);
1309 rpcrdma_buffer_put_sendbuf(req, buffers);
1310 switch (ia->ri_memreg_strategy) {
1312 case RPCRDMA_MTHCAFMR:
1313 rpcrdma_buffer_put_mrs(req, buffers);
1318 spin_unlock_irqrestore(&buffers->rb_lock, flags);
1322 * Recover reply buffers from pool.
1323 * This happens when recovering from error conditions.
1324 * Post-increment counter/array index.
1327 rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
1329 struct rpcrdma_buffer *buffers = req->rl_buffer;
1330 unsigned long flags;
1332 spin_lock_irqsave(&buffers->rb_lock, flags);
1333 if (buffers->rb_recv_index < buffers->rb_max_requests) {
1334 req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
1335 buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
1337 spin_unlock_irqrestore(&buffers->rb_lock, flags);
1341 * Put reply buffers back into pool when not attached to
1342 * request. This happens in error conditions.
1345 rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
1347 struct rpcrdma_buffer *buffers = rep->rr_buffer;
1348 unsigned long flags;
1350 rep->rr_func = NULL;
1351 spin_lock_irqsave(&buffers->rb_lock, flags);
1352 buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep;
1353 spin_unlock_irqrestore(&buffers->rb_lock, flags);
1357 * Wrappers for internal-use kmalloc memory registration, used by buffer code.
1361 rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
1363 dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
1365 (unsigned long long)seg->mr_dma, seg->mr_dmalen);
1369 rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
1370 struct ib_mr **mrp, struct ib_sge *iov)
1372 struct ib_phys_buf ipb;
1377 * All memory passed here was kmalloc'ed, therefore phys-contiguous.
1379 iov->addr = ib_dma_map_single(ia->ri_id->device,
1380 va, len, DMA_BIDIRECTIONAL);
1381 if (ib_dma_mapping_error(ia->ri_id->device, iov->addr))
1386 if (ia->ri_have_dma_lkey) {
1388 iov->lkey = ia->ri_dma_lkey;
1390 } else if (ia->ri_bind_mem != NULL) {
1392 iov->lkey = ia->ri_bind_mem->lkey;
1396 ipb.addr = iov->addr;
1397 ipb.size = iov->length;
1398 mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1,
1399 IB_ACCESS_LOCAL_WRITE, &iov->addr);
1401 dprintk("RPC: %s: phys convert: 0x%llx "
1402 "registered 0x%llx length %d\n",
1403 __func__, (unsigned long long)ipb.addr,
1404 (unsigned long long)iov->addr, len);
1409 dprintk("RPC: %s: failed with %i\n", __func__, rc);
1412 iov->lkey = mr->lkey;
1420 rpcrdma_deregister_internal(struct rpcrdma_ia *ia,
1421 struct ib_mr *mr, struct ib_sge *iov)
1425 ib_dma_unmap_single(ia->ri_id->device,
1426 iov->addr, iov->length, DMA_BIDIRECTIONAL);
1431 rc = ib_dereg_mr(mr);
1433 dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc);
1438 * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
1439 * @ia: controlling rpcrdma_ia
1440 * @size: size of buffer to be allocated, in bytes
1443 * Returns pointer to private header of an area of internally
1444 * registered memory, or an ERR_PTR. The registered buffer follows
1445 * the end of the private header.
1447 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
1448 * receiving the payload of RDMA RECV operations. regbufs are not
1449 * used for RDMA READ/WRITE operations, thus are registered only for
1452 struct rpcrdma_regbuf *
1453 rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags)
1455 struct rpcrdma_regbuf *rb;
1459 rb = kmalloc(sizeof(*rb) + size, flags);
1464 rb->rg_owner = NULL;
1465 rc = rpcrdma_register_internal(ia, rb->rg_base, size,
1466 &rb->rg_mr, &rb->rg_iov);
1479 * rpcrdma_free_regbuf - deregister and free registered buffer
1480 * @ia: controlling rpcrdma_ia
1481 * @rb: regbuf to be deregistered and freed
1484 rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
1487 rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov);
1493 * Prepost any receive buffer, then post send.
1495 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1498 rpcrdma_ep_post(struct rpcrdma_ia *ia,
1499 struct rpcrdma_ep *ep,
1500 struct rpcrdma_req *req)
1502 struct ib_send_wr send_wr, *send_wr_fail;
1503 struct rpcrdma_rep *rep = req->rl_reply;
1507 rc = rpcrdma_ep_post_recv(ia, ep, rep);
1510 req->rl_reply = NULL;
1513 send_wr.next = NULL;
1514 send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION;
1515 send_wr.sg_list = req->rl_send_iov;
1516 send_wr.num_sge = req->rl_niovs;
1517 send_wr.opcode = IB_WR_SEND;
1518 if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */
1519 ib_dma_sync_single_for_device(ia->ri_id->device,
1520 req->rl_send_iov[3].addr, req->rl_send_iov[3].length,
1522 ib_dma_sync_single_for_device(ia->ri_id->device,
1523 req->rl_send_iov[1].addr, req->rl_send_iov[1].length,
1525 ib_dma_sync_single_for_device(ia->ri_id->device,
1526 req->rl_send_iov[0].addr, req->rl_send_iov[0].length,
1529 if (DECR_CQCOUNT(ep) > 0)
1530 send_wr.send_flags = 0;
1531 else { /* Provider must take a send completion every now and then */
1533 send_wr.send_flags = IB_SEND_SIGNALED;
1536 rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
1538 dprintk("RPC: %s: ib_post_send returned %i\n", __func__,
1545 * (Re)post a receive buffer.
1548 rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
1549 struct rpcrdma_ep *ep,
1550 struct rpcrdma_rep *rep)
1552 struct ib_recv_wr recv_wr, *recv_wr_fail;
1555 recv_wr.next = NULL;
1556 recv_wr.wr_id = (u64) (unsigned long) rep;
1557 recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
1558 recv_wr.num_sge = 1;
1560 ib_dma_sync_single_for_cpu(ia->ri_id->device,
1561 rdmab_addr(rep->rr_rdmabuf),
1562 rdmab_length(rep->rr_rdmabuf),
1565 rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
1568 dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
1573 /* How many chunk list items fit within our inline buffers?
1576 rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt)
1578 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
1579 int bytes, segments;
1581 bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize);
1582 bytes -= RPCRDMA_HDRLEN_MIN;
1583 if (bytes < sizeof(struct rpcrdma_segment) * 2) {
1584 pr_warn("RPC: %s: inline threshold too small\n",
1589 segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1);
1590 dprintk("RPC: %s: max chunk list size = %d segments\n",
1591 __func__, segments);