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 <linux/sunrpc/svc_rdma.h>
55 #include <asm/bitops.h>
56 #include <linux/module.h> /* try_module_get()/module_put() */
58 #include "xprt_rdma.h"
64 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
65 # define RPCDBG_FACILITY RPCDBG_TRANS
72 static struct workqueue_struct *rpcrdma_receive_wq;
75 rpcrdma_alloc_wq(void)
77 struct workqueue_struct *recv_wq;
79 recv_wq = alloc_workqueue("xprtrdma_receive",
80 WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_HIGHPRI,
85 rpcrdma_receive_wq = recv_wq;
90 rpcrdma_destroy_wq(void)
92 struct workqueue_struct *wq;
94 if (rpcrdma_receive_wq) {
95 wq = rpcrdma_receive_wq;
96 rpcrdma_receive_wq = NULL;
97 destroy_workqueue(wq);
102 rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
104 struct rpcrdma_ep *ep = context;
106 pr_err("RPC: %s: %s on device %s ep %p\n",
107 __func__, ib_event_msg(event->event),
108 event->device->name, context);
109 if (ep->rep_connected == 1) {
110 ep->rep_connected = -EIO;
111 rpcrdma_conn_func(ep);
112 wake_up_all(&ep->rep_connect_wait);
117 * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
118 * @cq: completion queue (ignored)
123 rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
125 /* WARNING: Only wr_cqe and status are reliable at this point */
126 if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR)
127 pr_err("rpcrdma: Send: %s (%u/0x%x)\n",
128 ib_wc_status_msg(wc->status),
129 wc->status, wc->vendor_err);
132 /* Perform basic sanity checking to avoid using garbage
133 * to update the credit grant value.
136 rpcrdma_update_granted_credits(struct rpcrdma_rep *rep)
138 struct rpcrdma_msg *rmsgp = rdmab_to_msg(rep->rr_rdmabuf);
139 struct rpcrdma_buffer *buffer = &rep->rr_rxprt->rx_buf;
142 if (rep->rr_len < RPCRDMA_HDRLEN_ERR)
145 credits = be32_to_cpu(rmsgp->rm_credit);
147 credits = 1; /* don't deadlock */
148 else if (credits > buffer->rb_max_requests)
149 credits = buffer->rb_max_requests;
151 atomic_set(&buffer->rb_credits, credits);
155 * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
156 * @cq: completion queue (ignored)
161 rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
163 struct ib_cqe *cqe = wc->wr_cqe;
164 struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
167 /* WARNING: Only wr_id and status are reliable at this point */
168 if (wc->status != IB_WC_SUCCESS)
171 /* status == SUCCESS means all fields in wc are trustworthy */
172 if (wc->opcode != IB_WC_RECV)
175 dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
176 __func__, rep, wc->byte_len);
178 rep->rr_len = wc->byte_len;
179 rep->rr_wc_flags = wc->wc_flags;
180 rep->rr_inv_rkey = wc->ex.invalidate_rkey;
182 ib_dma_sync_single_for_cpu(rep->rr_device,
183 rdmab_addr(rep->rr_rdmabuf),
184 rep->rr_len, DMA_FROM_DEVICE);
186 rpcrdma_update_granted_credits(rep);
189 queue_work(rpcrdma_receive_wq, &rep->rr_work);
193 if (wc->status != IB_WC_WR_FLUSH_ERR)
194 pr_err("rpcrdma: Recv: %s (%u/0x%x)\n",
195 ib_wc_status_msg(wc->status),
196 wc->status, wc->vendor_err);
197 rep->rr_len = RPCRDMA_BAD_LEN;
202 rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
203 struct rdma_conn_param *param)
205 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
206 const struct rpcrdma_connect_private *pmsg = param->private_data;
207 unsigned int rsize, wsize;
209 /* Default settings for RPC-over-RDMA Version One */
210 r_xprt->rx_ia.ri_reminv_expected = false;
211 r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize;
212 rsize = RPCRDMA_V1_DEF_INLINE_SIZE;
213 wsize = RPCRDMA_V1_DEF_INLINE_SIZE;
216 pmsg->cp_magic == rpcrdma_cmp_magic &&
217 pmsg->cp_version == RPCRDMA_CMP_VERSION) {
218 r_xprt->rx_ia.ri_reminv_expected = true;
219 r_xprt->rx_ia.ri_implicit_roundup = true;
220 rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size);
221 wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
224 if (rsize < cdata->inline_rsize)
225 cdata->inline_rsize = rsize;
226 if (wsize < cdata->inline_wsize)
227 cdata->inline_wsize = wsize;
228 dprintk("RPC: %s: max send %u, max recv %u\n",
229 __func__, cdata->inline_wsize, cdata->inline_rsize);
230 rpcrdma_set_max_header_sizes(r_xprt);
234 rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
236 struct rpcrdma_xprt *xprt = id->context;
237 struct rpcrdma_ia *ia = &xprt->rx_ia;
238 struct rpcrdma_ep *ep = &xprt->rx_ep;
239 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
240 struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr;
242 struct ib_qp_attr *attr = &ia->ri_qp_attr;
243 struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
246 switch (event->event) {
247 case RDMA_CM_EVENT_ADDR_RESOLVED:
248 case RDMA_CM_EVENT_ROUTE_RESOLVED:
250 complete(&ia->ri_done);
252 case RDMA_CM_EVENT_ADDR_ERROR:
253 ia->ri_async_rc = -EHOSTUNREACH;
254 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
256 complete(&ia->ri_done);
258 case RDMA_CM_EVENT_ROUTE_ERROR:
259 ia->ri_async_rc = -ENETUNREACH;
260 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
262 complete(&ia->ri_done);
264 case RDMA_CM_EVENT_ESTABLISHED:
266 ib_query_qp(ia->ri_id->qp, attr,
267 IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
269 dprintk("RPC: %s: %d responder resources"
271 __func__, attr->max_dest_rd_atomic,
272 attr->max_rd_atomic);
273 rpcrdma_update_connect_private(xprt, &event->param.conn);
275 case RDMA_CM_EVENT_CONNECT_ERROR:
276 connstate = -ENOTCONN;
278 case RDMA_CM_EVENT_UNREACHABLE:
279 connstate = -ENETDOWN;
281 case RDMA_CM_EVENT_REJECTED:
282 connstate = -ECONNREFUSED;
284 case RDMA_CM_EVENT_DISCONNECTED:
285 connstate = -ECONNABORTED;
287 case RDMA_CM_EVENT_DEVICE_REMOVAL:
290 dprintk("RPC: %s: %sconnected\n",
291 __func__, connstate > 0 ? "" : "dis");
292 atomic_set(&xprt->rx_buf.rb_credits, 1);
293 ep->rep_connected = connstate;
294 rpcrdma_conn_func(ep);
295 wake_up_all(&ep->rep_connect_wait);
298 dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
299 __func__, sap, rpc_get_port(sap), ep,
300 rdma_event_msg(event->event));
304 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
305 if (connstate == 1) {
306 int ird = attr->max_dest_rd_atomic;
307 int tird = ep->rep_remote_cma.responder_resources;
309 pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
310 sap, rpc_get_port(sap),
312 ia->ri_ops->ro_displayname,
313 xprt->rx_buf.rb_max_requests,
314 ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
315 } else if (connstate < 0) {
316 pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
317 sap, rpc_get_port(sap), connstate);
324 static void rpcrdma_destroy_id(struct rdma_cm_id *id)
327 module_put(id->device->owner);
332 static struct rdma_cm_id *
333 rpcrdma_create_id(struct rpcrdma_xprt *xprt,
334 struct rpcrdma_ia *ia, struct sockaddr *addr)
336 struct rdma_cm_id *id;
339 init_completion(&ia->ri_done);
341 id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP,
345 dprintk("RPC: %s: rdma_create_id() failed %i\n",
350 ia->ri_async_rc = -ETIMEDOUT;
351 rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
353 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
357 wait_for_completion_interruptible_timeout(&ia->ri_done,
358 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
361 * Until xprtrdma supports DEVICE_REMOVAL, the provider must
362 * be pinned while there are active NFS/RDMA mounts to prevent
363 * hangs and crashes at umount time.
365 if (!ia->ri_async_rc && !try_module_get(id->device->owner)) {
366 dprintk("RPC: %s: Failed to get device module\n",
368 ia->ri_async_rc = -ENODEV;
370 rc = ia->ri_async_rc;
374 ia->ri_async_rc = -ETIMEDOUT;
375 rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
377 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
381 wait_for_completion_interruptible_timeout(&ia->ri_done,
382 msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
383 rc = ia->ri_async_rc;
389 module_put(id->device->owner);
396 * Exported functions.
400 * Open and initialize an Interface Adapter.
401 * o initializes fields of struct rpcrdma_ia, including
402 * interface and provider attributes and protection zone.
405 rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
407 struct rpcrdma_ia *ia = &xprt->rx_ia;
410 ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
411 if (IS_ERR(ia->ri_id)) {
412 rc = PTR_ERR(ia->ri_id);
415 ia->ri_device = ia->ri_id->device;
417 ia->ri_pd = ib_alloc_pd(ia->ri_device, 0);
418 if (IS_ERR(ia->ri_pd)) {
419 rc = PTR_ERR(ia->ri_pd);
420 pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc);
426 if (frwr_is_supported(ia)) {
427 ia->ri_ops = &rpcrdma_frwr_memreg_ops;
431 case RPCRDMA_MTHCAFMR:
432 if (fmr_is_supported(ia)) {
433 ia->ri_ops = &rpcrdma_fmr_memreg_ops;
438 pr_err("rpcrdma: Unsupported memory registration mode: %d\n",
447 ib_dealloc_pd(ia->ri_pd);
450 rpcrdma_destroy_id(ia->ri_id);
457 * Clean up/close an IA.
458 * o if event handles and PD have been initialized, free them.
462 rpcrdma_ia_close(struct rpcrdma_ia *ia)
464 dprintk("RPC: %s: entering\n", __func__);
465 if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
467 rdma_destroy_qp(ia->ri_id);
468 rpcrdma_destroy_id(ia->ri_id);
472 /* If the pd is still busy, xprtrdma missed freeing a resource */
473 if (ia->ri_pd && !IS_ERR(ia->ri_pd))
474 ib_dealloc_pd(ia->ri_pd);
478 * Create unconnected endpoint.
481 rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
482 struct rpcrdma_create_data_internal *cdata)
484 struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
485 unsigned int max_qp_wr, max_sge;
486 struct ib_cq *sendcq, *recvcq;
489 max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
490 RPCRDMA_MAX_SEND_SGES);
491 if (max_sge < RPCRDMA_MIN_SEND_SGES) {
492 pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge);
495 ia->ri_max_send_sges = max_sge - RPCRDMA_MIN_SEND_SGES;
497 if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
498 dprintk("RPC: %s: insufficient wqe's available\n",
502 max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
504 /* check provider's send/recv wr limits */
505 if (cdata->max_requests > max_qp_wr)
506 cdata->max_requests = max_qp_wr;
508 ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
509 ep->rep_attr.qp_context = ep;
510 ep->rep_attr.srq = NULL;
511 ep->rep_attr.cap.max_send_wr = cdata->max_requests;
512 ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
513 ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
514 rc = ia->ri_ops->ro_open(ia, ep, cdata);
517 ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
518 ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
519 ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
520 ep->rep_attr.cap.max_send_sge = max_sge;
521 ep->rep_attr.cap.max_recv_sge = 1;
522 ep->rep_attr.cap.max_inline_data = 0;
523 ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
524 ep->rep_attr.qp_type = IB_QPT_RC;
525 ep->rep_attr.port_num = ~0;
527 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
528 "iovs: send %d recv %d\n",
530 ep->rep_attr.cap.max_send_wr,
531 ep->rep_attr.cap.max_recv_wr,
532 ep->rep_attr.cap.max_send_sge,
533 ep->rep_attr.cap.max_recv_sge);
535 /* set trigger for requesting send completion */
536 ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
537 if (ep->rep_cqinit <= 2)
538 ep->rep_cqinit = 0; /* always signal? */
539 rpcrdma_init_cqcount(ep, 0);
540 init_waitqueue_head(&ep->rep_connect_wait);
541 INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
543 sendcq = ib_alloc_cq(ia->ri_device, NULL,
544 ep->rep_attr.cap.max_send_wr + 1,
546 if (IS_ERR(sendcq)) {
547 rc = PTR_ERR(sendcq);
548 dprintk("RPC: %s: failed to create send CQ: %i\n",
553 recvcq = ib_alloc_cq(ia->ri_device, NULL,
554 ep->rep_attr.cap.max_recv_wr + 1,
556 if (IS_ERR(recvcq)) {
557 rc = PTR_ERR(recvcq);
558 dprintk("RPC: %s: failed to create recv CQ: %i\n",
563 ep->rep_attr.send_cq = sendcq;
564 ep->rep_attr.recv_cq = recvcq;
566 /* Initialize cma parameters */
567 memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));
569 /* Prepare RDMA-CM private message */
570 pmsg->cp_magic = rpcrdma_cmp_magic;
571 pmsg->cp_version = RPCRDMA_CMP_VERSION;
572 pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok;
573 pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize);
574 pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize);
575 ep->rep_remote_cma.private_data = pmsg;
576 ep->rep_remote_cma.private_data_len = sizeof(*pmsg);
578 /* Client offers RDMA Read but does not initiate */
579 ep->rep_remote_cma.initiator_depth = 0;
580 if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */
581 ep->rep_remote_cma.responder_resources = 32;
583 ep->rep_remote_cma.responder_resources =
584 ia->ri_device->attrs.max_qp_rd_atom;
586 /* Limit transport retries so client can detect server
587 * GID changes quickly. RPC layer handles re-establishing
588 * transport connection and retransmission.
590 ep->rep_remote_cma.retry_count = 6;
592 /* RPC-over-RDMA handles its own flow control. In addition,
593 * make all RNR NAKs visible so we know that RPC-over-RDMA
594 * flow control is working correctly (no NAKs should be seen).
596 ep->rep_remote_cma.flow_control = 0;
597 ep->rep_remote_cma.rnr_retry_count = 0;
610 * Disconnect and destroy endpoint. After this, the only
611 * valid operations on the ep are to free it (if dynamically
612 * allocated) or re-create it.
615 rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
617 dprintk("RPC: %s: entering, connected is %d\n",
618 __func__, ep->rep_connected);
620 cancel_delayed_work_sync(&ep->rep_connect_worker);
623 rpcrdma_ep_disconnect(ep, ia);
624 rdma_destroy_qp(ia->ri_id);
625 ia->ri_id->qp = NULL;
628 ib_free_cq(ep->rep_attr.recv_cq);
629 ib_free_cq(ep->rep_attr.send_cq);
633 * Connect unconnected endpoint.
636 rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
638 struct rdma_cm_id *id, *old;
642 if (ep->rep_connected != 0) {
643 struct rpcrdma_xprt *xprt;
645 dprintk("RPC: %s: reconnecting...\n", __func__);
647 rpcrdma_ep_disconnect(ep, ia);
649 xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
650 id = rpcrdma_create_id(xprt, ia,
651 (struct sockaddr *)&xprt->rx_data.addr);
656 /* TEMP TEMP TEMP - fail if new device:
657 * Deregister/remarshal *all* requests!
658 * Close and recreate adapter, pd, etc!
659 * Re-determine all attributes still sane!
660 * More stuff I haven't thought of!
663 if (ia->ri_device != id->device) {
664 printk("RPC: %s: can't reconnect on "
665 "different device!\n", __func__);
666 rpcrdma_destroy_id(id);
671 rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
673 dprintk("RPC: %s: rdma_create_qp failed %i\n",
675 rpcrdma_destroy_id(id);
683 rdma_destroy_qp(old);
684 rpcrdma_destroy_id(old);
686 dprintk("RPC: %s: connecting...\n", __func__);
687 rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
689 dprintk("RPC: %s: rdma_create_qp failed %i\n",
691 /* do not update ep->rep_connected */
696 ep->rep_connected = 0;
698 rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
700 dprintk("RPC: %s: rdma_connect() failed with %i\n",
705 wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
708 * Check state. A non-peer reject indicates no listener
709 * (ECONNREFUSED), which may be a transient state. All
710 * others indicate a transport condition which has already
711 * undergone a best-effort.
713 if (ep->rep_connected == -ECONNREFUSED &&
714 ++retry_count <= RDMA_CONNECT_RETRY_MAX) {
715 dprintk("RPC: %s: non-peer_reject, retry\n", __func__);
718 if (ep->rep_connected <= 0) {
719 /* Sometimes, the only way to reliably connect to remote
720 * CMs is to use same nonzero values for ORD and IRD. */
721 if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 &&
722 (ep->rep_remote_cma.responder_resources == 0 ||
723 ep->rep_remote_cma.initiator_depth !=
724 ep->rep_remote_cma.responder_resources)) {
725 if (ep->rep_remote_cma.responder_resources == 0)
726 ep->rep_remote_cma.responder_resources = 1;
727 ep->rep_remote_cma.initiator_depth =
728 ep->rep_remote_cma.responder_resources;
731 rc = ep->rep_connected;
733 struct rpcrdma_xprt *r_xprt;
736 dprintk("RPC: %s: connected\n", __func__);
738 r_xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
739 extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
742 rc = rpcrdma_ep_post_extra_recv(r_xprt, extras);
744 pr_warn("%s: rpcrdma_ep_post_extra_recv: %i\n",
753 ep->rep_connected = rc;
758 * rpcrdma_ep_disconnect
760 * This is separate from destroy to facilitate the ability
761 * to reconnect without recreating the endpoint.
763 * This call is not reentrant, and must not be made in parallel
764 * on the same endpoint.
767 rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
771 rc = rdma_disconnect(ia->ri_id);
773 /* returns without wait if not connected */
774 wait_event_interruptible(ep->rep_connect_wait,
775 ep->rep_connected != 1);
776 dprintk("RPC: %s: after wait, %sconnected\n", __func__,
777 (ep->rep_connected == 1) ? "still " : "dis");
779 dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc);
780 ep->rep_connected = rc;
783 ib_drain_qp(ia->ri_id->qp);
787 rpcrdma_mr_recovery_worker(struct work_struct *work)
789 struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
790 rb_recovery_worker.work);
791 struct rpcrdma_mw *mw;
793 spin_lock(&buf->rb_recovery_lock);
794 while (!list_empty(&buf->rb_stale_mrs)) {
795 mw = list_first_entry(&buf->rb_stale_mrs,
796 struct rpcrdma_mw, mw_list);
797 list_del_init(&mw->mw_list);
798 spin_unlock(&buf->rb_recovery_lock);
800 dprintk("RPC: %s: recovering MR %p\n", __func__, mw);
801 mw->mw_xprt->rx_ia.ri_ops->ro_recover_mr(mw);
803 spin_lock(&buf->rb_recovery_lock);
805 spin_unlock(&buf->rb_recovery_lock);
809 rpcrdma_defer_mr_recovery(struct rpcrdma_mw *mw)
811 struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
812 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
814 spin_lock(&buf->rb_recovery_lock);
815 list_add(&mw->mw_list, &buf->rb_stale_mrs);
816 spin_unlock(&buf->rb_recovery_lock);
818 schedule_delayed_work(&buf->rb_recovery_worker, 0);
822 rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt)
824 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
825 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
830 for (count = 0; count < 32; count++) {
831 struct rpcrdma_mw *mw;
834 mw = kzalloc(sizeof(*mw), GFP_KERNEL);
838 rc = ia->ri_ops->ro_init_mr(ia, mw);
844 mw->mw_xprt = r_xprt;
846 list_add(&mw->mw_list, &free);
847 list_add(&mw->mw_all, &all);
850 spin_lock(&buf->rb_mwlock);
851 list_splice(&free, &buf->rb_mws);
852 list_splice(&all, &buf->rb_all);
853 r_xprt->rx_stats.mrs_allocated += count;
854 spin_unlock(&buf->rb_mwlock);
856 dprintk("RPC: %s: created %u MRs\n", __func__, count);
860 rpcrdma_mr_refresh_worker(struct work_struct *work)
862 struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
863 rb_refresh_worker.work);
864 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
867 rpcrdma_create_mrs(r_xprt);
871 rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
873 struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
874 struct rpcrdma_req *req;
876 req = kzalloc(sizeof(*req), GFP_KERNEL);
878 return ERR_PTR(-ENOMEM);
880 INIT_LIST_HEAD(&req->rl_free);
881 spin_lock(&buffer->rb_reqslock);
882 list_add(&req->rl_all, &buffer->rb_allreqs);
883 spin_unlock(&buffer->rb_reqslock);
884 req->rl_cqe.done = rpcrdma_wc_send;
885 req->rl_buffer = &r_xprt->rx_buf;
886 INIT_LIST_HEAD(&req->rl_registered);
887 req->rl_send_wr.next = NULL;
888 req->rl_send_wr.wr_cqe = &req->rl_cqe;
889 req->rl_send_wr.sg_list = req->rl_send_sge;
890 req->rl_send_wr.opcode = IB_WR_SEND;
895 * rpcrdma_create_rep - Allocate an rpcrdma_rep object
896 * @r_xprt: controlling transport
898 * Returns 0 on success or a negative errno on failure.
901 rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
903 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
904 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
905 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
906 struct rpcrdma_rep *rep;
910 rep = kzalloc(sizeof(*rep), GFP_KERNEL);
914 rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize,
915 DMA_FROM_DEVICE, GFP_KERNEL);
916 if (IS_ERR(rep->rr_rdmabuf)) {
917 rc = PTR_ERR(rep->rr_rdmabuf);
921 rep->rr_device = ia->ri_device;
922 rep->rr_cqe.done = rpcrdma_wc_receive;
923 rep->rr_rxprt = r_xprt;
924 INIT_WORK(&rep->rr_work, rpcrdma_reply_handler);
925 rep->rr_recv_wr.next = NULL;
926 rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
927 rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
928 rep->rr_recv_wr.num_sge = 1;
930 spin_lock(&buf->rb_lock);
931 list_add(&rep->rr_list, &buf->rb_recv_bufs);
932 spin_unlock(&buf->rb_lock);
938 dprintk("RPC: %s: reply buffer %d alloc failed\n",
944 rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
946 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
949 buf->rb_max_requests = r_xprt->rx_data.max_requests;
950 buf->rb_bc_srv_max_requests = 0;
951 atomic_set(&buf->rb_credits, 1);
952 spin_lock_init(&buf->rb_mwlock);
953 spin_lock_init(&buf->rb_lock);
954 spin_lock_init(&buf->rb_recovery_lock);
955 INIT_LIST_HEAD(&buf->rb_mws);
956 INIT_LIST_HEAD(&buf->rb_all);
957 INIT_LIST_HEAD(&buf->rb_stale_mrs);
958 INIT_DELAYED_WORK(&buf->rb_refresh_worker,
959 rpcrdma_mr_refresh_worker);
960 INIT_DELAYED_WORK(&buf->rb_recovery_worker,
961 rpcrdma_mr_recovery_worker);
963 rpcrdma_create_mrs(r_xprt);
965 INIT_LIST_HEAD(&buf->rb_send_bufs);
966 INIT_LIST_HEAD(&buf->rb_allreqs);
967 spin_lock_init(&buf->rb_reqslock);
968 for (i = 0; i < buf->rb_max_requests; i++) {
969 struct rpcrdma_req *req;
971 req = rpcrdma_create_req(r_xprt);
973 dprintk("RPC: %s: request buffer %d alloc"
974 " failed\n", __func__, i);
978 req->rl_backchannel = false;
979 list_add(&req->rl_free, &buf->rb_send_bufs);
982 INIT_LIST_HEAD(&buf->rb_recv_bufs);
983 for (i = 0; i <= buf->rb_max_requests; i++) {
984 rc = rpcrdma_create_rep(r_xprt);
991 rpcrdma_buffer_destroy(buf);
995 static struct rpcrdma_req *
996 rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
998 struct rpcrdma_req *req;
1000 req = list_first_entry(&buf->rb_send_bufs,
1001 struct rpcrdma_req, rl_free);
1002 list_del(&req->rl_free);
1006 static struct rpcrdma_rep *
1007 rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf)
1009 struct rpcrdma_rep *rep;
1011 rep = list_first_entry(&buf->rb_recv_bufs,
1012 struct rpcrdma_rep, rr_list);
1013 list_del(&rep->rr_list);
1018 rpcrdma_destroy_rep(struct rpcrdma_rep *rep)
1020 rpcrdma_free_regbuf(rep->rr_rdmabuf);
1025 rpcrdma_destroy_req(struct rpcrdma_req *req)
1027 rpcrdma_free_regbuf(req->rl_recvbuf);
1028 rpcrdma_free_regbuf(req->rl_sendbuf);
1029 rpcrdma_free_regbuf(req->rl_rdmabuf);
1034 rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf)
1036 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
1038 struct rpcrdma_ia *ia = rdmab_to_ia(buf);
1039 struct rpcrdma_mw *mw;
1043 spin_lock(&buf->rb_mwlock);
1044 while (!list_empty(&buf->rb_all)) {
1045 mw = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);
1046 list_del(&mw->mw_all);
1048 spin_unlock(&buf->rb_mwlock);
1049 ia->ri_ops->ro_release_mr(mw);
1051 spin_lock(&buf->rb_mwlock);
1053 spin_unlock(&buf->rb_mwlock);
1054 r_xprt->rx_stats.mrs_allocated = 0;
1056 dprintk("RPC: %s: released %u MRs\n", __func__, count);
1060 rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
1062 cancel_delayed_work_sync(&buf->rb_recovery_worker);
1063 cancel_delayed_work_sync(&buf->rb_refresh_worker);
1065 while (!list_empty(&buf->rb_recv_bufs)) {
1066 struct rpcrdma_rep *rep;
1068 rep = rpcrdma_buffer_get_rep_locked(buf);
1069 rpcrdma_destroy_rep(rep);
1071 buf->rb_send_count = 0;
1073 spin_lock(&buf->rb_reqslock);
1074 while (!list_empty(&buf->rb_allreqs)) {
1075 struct rpcrdma_req *req;
1077 req = list_first_entry(&buf->rb_allreqs,
1078 struct rpcrdma_req, rl_all);
1079 list_del(&req->rl_all);
1081 spin_unlock(&buf->rb_reqslock);
1082 rpcrdma_destroy_req(req);
1083 spin_lock(&buf->rb_reqslock);
1085 spin_unlock(&buf->rb_reqslock);
1086 buf->rb_recv_count = 0;
1088 rpcrdma_destroy_mrs(buf);
1092 rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
1094 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
1095 struct rpcrdma_mw *mw = NULL;
1097 spin_lock(&buf->rb_mwlock);
1098 if (!list_empty(&buf->rb_mws)) {
1099 mw = list_first_entry(&buf->rb_mws,
1100 struct rpcrdma_mw, mw_list);
1101 list_del_init(&mw->mw_list);
1103 spin_unlock(&buf->rb_mwlock);
1110 dprintk("RPC: %s: no MWs available\n", __func__);
1111 schedule_delayed_work(&buf->rb_refresh_worker, 0);
1113 /* Allow the reply handler and refresh worker to run */
1120 rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
1122 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
1124 spin_lock(&buf->rb_mwlock);
1125 list_add_tail(&mw->mw_list, &buf->rb_mws);
1126 spin_unlock(&buf->rb_mwlock);
1129 static struct rpcrdma_rep *
1130 rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers)
1132 /* If an RPC previously completed without a reply (say, a
1133 * credential problem or a soft timeout occurs) then hold off
1134 * on supplying more Receive buffers until the number of new
1135 * pending RPCs catches up to the number of posted Receives.
1137 if (unlikely(buffers->rb_send_count < buffers->rb_recv_count))
1140 if (unlikely(list_empty(&buffers->rb_recv_bufs)))
1142 buffers->rb_recv_count++;
1143 return rpcrdma_buffer_get_rep_locked(buffers);
1147 * Get a set of request/reply buffers.
1149 * Reply buffer (if available) is attached to send buffer upon return.
1151 struct rpcrdma_req *
1152 rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
1154 struct rpcrdma_req *req;
1156 spin_lock(&buffers->rb_lock);
1157 if (list_empty(&buffers->rb_send_bufs))
1159 buffers->rb_send_count++;
1160 req = rpcrdma_buffer_get_req_locked(buffers);
1161 req->rl_reply = rpcrdma_buffer_get_rep(buffers);
1162 spin_unlock(&buffers->rb_lock);
1166 spin_unlock(&buffers->rb_lock);
1167 pr_warn("RPC: %s: out of request buffers\n", __func__);
1172 * Put request/reply buffers back into pool.
1173 * Pre-decrement counter/array index.
1176 rpcrdma_buffer_put(struct rpcrdma_req *req)
1178 struct rpcrdma_buffer *buffers = req->rl_buffer;
1179 struct rpcrdma_rep *rep = req->rl_reply;
1181 req->rl_send_wr.num_sge = 0;
1182 req->rl_reply = NULL;
1184 spin_lock(&buffers->rb_lock);
1185 buffers->rb_send_count--;
1186 list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
1188 buffers->rb_recv_count--;
1189 list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
1191 spin_unlock(&buffers->rb_lock);
1195 * Recover reply buffers from pool.
1196 * This happens when recovering from disconnect.
1199 rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
1201 struct rpcrdma_buffer *buffers = req->rl_buffer;
1203 spin_lock(&buffers->rb_lock);
1204 req->rl_reply = rpcrdma_buffer_get_rep(buffers);
1205 spin_unlock(&buffers->rb_lock);
1209 * Put reply buffers back into pool when not attached to
1210 * request. This happens in error conditions.
1213 rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
1215 struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
1217 spin_lock(&buffers->rb_lock);
1218 buffers->rb_recv_count--;
1219 list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
1220 spin_unlock(&buffers->rb_lock);
1224 * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers
1225 * @size: size of buffer to be allocated, in bytes
1226 * @direction: direction of data movement
1229 * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that
1230 * can be persistently DMA-mapped for I/O.
1232 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
1233 * receiving the payload of RDMA RECV operations. During Long Calls
1234 * or Replies they may be registered externally via ro_map.
1236 struct rpcrdma_regbuf *
1237 rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction,
1240 struct rpcrdma_regbuf *rb;
1242 rb = kmalloc(sizeof(*rb) + size, flags);
1244 return ERR_PTR(-ENOMEM);
1246 rb->rg_device = NULL;
1247 rb->rg_direction = direction;
1248 rb->rg_iov.length = size;
1254 * __rpcrdma_map_regbuf - DMA-map a regbuf
1255 * @ia: controlling rpcrdma_ia
1256 * @rb: regbuf to be mapped
1259 __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
1261 if (rb->rg_direction == DMA_NONE)
1264 rb->rg_iov.addr = ib_dma_map_single(ia->ri_device,
1265 (void *)rb->rg_base,
1268 if (ib_dma_mapping_error(ia->ri_device, rdmab_addr(rb)))
1271 rb->rg_device = ia->ri_device;
1272 rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey;
1277 rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb)
1279 if (!rpcrdma_regbuf_is_mapped(rb))
1282 ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb),
1283 rdmab_length(rb), rb->rg_direction);
1284 rb->rg_device = NULL;
1288 * rpcrdma_free_regbuf - deregister and free registered buffer
1289 * @rb: regbuf to be deregistered and freed
1292 rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb)
1297 rpcrdma_dma_unmap_regbuf(rb);
1302 * Prepost any receive buffer, then post send.
1304 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1307 rpcrdma_ep_post(struct rpcrdma_ia *ia,
1308 struct rpcrdma_ep *ep,
1309 struct rpcrdma_req *req)
1311 struct ib_send_wr *send_wr = &req->rl_send_wr;
1312 struct ib_send_wr *send_wr_fail;
1315 if (req->rl_reply) {
1316 rc = rpcrdma_ep_post_recv(ia, req->rl_reply);
1319 req->rl_reply = NULL;
1322 dprintk("RPC: %s: posting %d s/g entries\n",
1323 __func__, send_wr->num_sge);
1325 rpcrdma_set_signaled(ep, send_wr);
1326 rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail);
1328 goto out_postsend_err;
1332 pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc);
1337 rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
1338 struct rpcrdma_rep *rep)
1340 struct ib_recv_wr *recv_wr_fail;
1343 if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf))
1345 rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail);
1351 pr_err("rpcrdma: failed to DMA map the Receive buffer\n");
1355 pr_err("rpcrdma: ib_post_recv returned %i\n", rc);
1360 * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
1361 * @r_xprt: transport associated with these backchannel resources
1362 * @min_reqs: minimum number of incoming requests expected
1364 * Returns zero if all requested buffers were posted, or a negative errno.
1367 rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count)
1369 struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
1370 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
1371 struct rpcrdma_rep *rep;
1375 spin_lock(&buffers->rb_lock);
1376 if (list_empty(&buffers->rb_recv_bufs))
1378 rep = rpcrdma_buffer_get_rep_locked(buffers);
1379 spin_unlock(&buffers->rb_lock);
1381 rc = rpcrdma_ep_post_recv(ia, rep);
1389 spin_unlock(&buffers->rb_lock);
1390 pr_warn("%s: no extra receive buffers\n", __func__);
1394 rpcrdma_recv_buffer_put(rep);