2 * Copyright (c) 2005-2007 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.
39 * Author: Tom Tucker <tom@opengridcomputing.com>
42 #include <linux/sunrpc/svc_xprt.h>
43 #include <linux/sunrpc/debug.h>
44 #include <linux/sunrpc/rpc_rdma.h>
45 #include <linux/spinlock.h>
46 #include <rdma/ib_verbs.h>
47 #include <rdma/rdma_cm.h>
48 #include <linux/sunrpc/svc_rdma.h>
50 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
52 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
53 struct sockaddr *sa, int salen,
55 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
56 static void svc_rdma_release_rqst(struct svc_rqst *);
57 static void dto_tasklet_func(unsigned long data);
58 static void svc_rdma_detach(struct svc_xprt *xprt);
59 static void svc_rdma_free(struct svc_xprt *xprt);
60 static int svc_rdma_has_wspace(struct svc_xprt *xprt);
61 static void rq_cq_reap(struct svcxprt_rdma *xprt);
62 static void sq_cq_reap(struct svcxprt_rdma *xprt);
64 DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL);
65 static DEFINE_SPINLOCK(dto_lock);
66 static LIST_HEAD(dto_xprt_q);
68 static struct svc_xprt_ops svc_rdma_ops = {
69 .xpo_create = svc_rdma_create,
70 .xpo_recvfrom = svc_rdma_recvfrom,
71 .xpo_sendto = svc_rdma_sendto,
72 .xpo_release_rqst = svc_rdma_release_rqst,
73 .xpo_detach = svc_rdma_detach,
74 .xpo_free = svc_rdma_free,
75 .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
76 .xpo_has_wspace = svc_rdma_has_wspace,
77 .xpo_accept = svc_rdma_accept,
80 struct svc_xprt_class svc_rdma_class = {
82 .xcl_owner = THIS_MODULE,
83 .xcl_ops = &svc_rdma_ops,
84 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
87 /* WR context cache. Created in svc_rdma.c */
88 extern struct kmem_cache *svc_rdma_ctxt_cachep;
90 struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
92 struct svc_rdma_op_ctxt *ctxt;
95 ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL);
98 schedule_timeout_uninterruptible(msecs_to_jiffies(500));
101 INIT_LIST_HEAD(&ctxt->dto_q);
104 atomic_inc(&xprt->sc_ctxt_used);
108 static void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
110 struct svcxprt_rdma *xprt = ctxt->xprt;
112 for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
114 * Unmap the DMA addr in the SGE if the lkey matches
115 * the sc_dma_lkey, otherwise, ignore it since it is
116 * an FRMR lkey and will be unmapped later when the
117 * last WR that uses it completes.
119 if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) {
120 atomic_dec(&xprt->sc_dma_used);
121 ib_dma_unmap_single(xprt->sc_cm_id->device,
129 void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
131 struct svcxprt_rdma *xprt;
137 for (i = 0; i < ctxt->count; i++)
138 put_page(ctxt->pages[i]);
140 kmem_cache_free(svc_rdma_ctxt_cachep, ctxt);
141 atomic_dec(&xprt->sc_ctxt_used);
144 /* Temporary NFS request map cache. Created in svc_rdma.c */
145 extern struct kmem_cache *svc_rdma_map_cachep;
148 * Temporary NFS req mappings are shared across all transport
149 * instances. These are short lived and should be bounded by the number
150 * of concurrent server threads * depth of the SQ.
152 struct svc_rdma_req_map *svc_rdma_get_req_map(void)
154 struct svc_rdma_req_map *map;
156 map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL);
159 schedule_timeout_uninterruptible(msecs_to_jiffies(500));
166 void svc_rdma_put_req_map(struct svc_rdma_req_map *map)
168 kmem_cache_free(svc_rdma_map_cachep, map);
171 /* ib_cq event handler */
172 static void cq_event_handler(struct ib_event *event, void *context)
174 struct svc_xprt *xprt = context;
175 dprintk("svcrdma: received CQ event id=%d, context=%p\n",
176 event->event, context);
177 set_bit(XPT_CLOSE, &xprt->xpt_flags);
180 /* QP event handler */
181 static void qp_event_handler(struct ib_event *event, void *context)
183 struct svc_xprt *xprt = context;
185 switch (event->event) {
186 /* These are considered benign events */
187 case IB_EVENT_PATH_MIG:
188 case IB_EVENT_COMM_EST:
189 case IB_EVENT_SQ_DRAINED:
190 case IB_EVENT_QP_LAST_WQE_REACHED:
191 dprintk("svcrdma: QP event %d received for QP=%p\n",
192 event->event, event->element.qp);
194 /* These are considered fatal events */
195 case IB_EVENT_PATH_MIG_ERR:
196 case IB_EVENT_QP_FATAL:
197 case IB_EVENT_QP_REQ_ERR:
198 case IB_EVENT_QP_ACCESS_ERR:
199 case IB_EVENT_DEVICE_FATAL:
201 dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
202 "closing transport\n",
203 event->event, event->element.qp);
204 set_bit(XPT_CLOSE, &xprt->xpt_flags);
210 * Data Transfer Operation Tasklet
212 * Walks a list of transports with I/O pending, removing entries as
213 * they are added to the server's I/O pending list. Two bits indicate
214 * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
215 * spinlock that serializes access to the transport list with the RQ
216 * and SQ interrupt handlers.
218 static void dto_tasklet_func(unsigned long data)
220 struct svcxprt_rdma *xprt;
223 spin_lock_irqsave(&dto_lock, flags);
224 while (!list_empty(&dto_xprt_q)) {
225 xprt = list_entry(dto_xprt_q.next,
226 struct svcxprt_rdma, sc_dto_q);
227 list_del_init(&xprt->sc_dto_q);
228 spin_unlock_irqrestore(&dto_lock, flags);
233 svc_xprt_put(&xprt->sc_xprt);
234 spin_lock_irqsave(&dto_lock, flags);
236 spin_unlock_irqrestore(&dto_lock, flags);
240 * Receive Queue Completion Handler
242 * Since an RQ completion handler is called on interrupt context, we
243 * need to defer the handling of the I/O to a tasklet
245 static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
247 struct svcxprt_rdma *xprt = cq_context;
250 /* Guard against unconditional flush call for destroyed QP */
251 if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
255 * Set the bit regardless of whether or not it's on the list
256 * because it may be on the list already due to an SQ
259 set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags);
262 * If this transport is not already on the DTO transport queue,
265 spin_lock_irqsave(&dto_lock, flags);
266 if (list_empty(&xprt->sc_dto_q)) {
267 svc_xprt_get(&xprt->sc_xprt);
268 list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
270 spin_unlock_irqrestore(&dto_lock, flags);
272 /* Tasklet does all the work to avoid irqsave locks. */
273 tasklet_schedule(&dto_tasklet);
277 * rq_cq_reap - Process the RQ CQ.
279 * Take all completing WC off the CQE and enqueue the associated DTO
280 * context on the dto_q for the transport.
282 * Note that caller must hold a transport reference.
284 static void rq_cq_reap(struct svcxprt_rdma *xprt)
288 struct svc_rdma_op_ctxt *ctxt = NULL;
290 if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags))
293 ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
294 atomic_inc(&rdma_stat_rq_poll);
296 while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
297 ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
298 ctxt->wc_status = wc.status;
299 ctxt->byte_len = wc.byte_len;
300 svc_rdma_unmap_dma(ctxt);
301 if (wc.status != IB_WC_SUCCESS) {
302 /* Close the transport */
303 dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt);
304 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
305 svc_rdma_put_context(ctxt, 1);
306 svc_xprt_put(&xprt->sc_xprt);
309 spin_lock_bh(&xprt->sc_rq_dto_lock);
310 list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
311 spin_unlock_bh(&xprt->sc_rq_dto_lock);
312 svc_xprt_put(&xprt->sc_xprt);
316 atomic_inc(&rdma_stat_rq_prod);
318 set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
320 * If data arrived before established event,
321 * don't enqueue. This defers RPC I/O until the
322 * RDMA connection is complete.
324 if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
325 svc_xprt_enqueue(&xprt->sc_xprt);
329 * Send Queue Completion Handler - potentially called on interrupt context.
331 * Note that caller must hold a transport reference.
333 static void sq_cq_reap(struct svcxprt_rdma *xprt)
335 struct svc_rdma_op_ctxt *ctxt = NULL;
337 struct ib_cq *cq = xprt->sc_sq_cq;
341 if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags))
344 ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
345 atomic_inc(&rdma_stat_sq_poll);
346 while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
347 ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
350 svc_rdma_unmap_dma(ctxt);
351 if (wc.status != IB_WC_SUCCESS)
352 /* Close the transport */
353 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
355 /* Decrement used SQ WR count */
356 atomic_dec(&xprt->sc_sq_count);
357 wake_up(&xprt->sc_send_wait);
359 switch (ctxt->wr_op) {
361 svc_rdma_put_context(ctxt, 1);
364 case IB_WR_RDMA_WRITE:
365 svc_rdma_put_context(ctxt, 0);
368 case IB_WR_RDMA_READ:
369 if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
370 struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
372 spin_lock_bh(&xprt->sc_rq_dto_lock);
373 set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
374 list_add_tail(&read_hdr->dto_q,
375 &xprt->sc_read_complete_q);
376 spin_unlock_bh(&xprt->sc_rq_dto_lock);
377 svc_xprt_enqueue(&xprt->sc_xprt);
379 svc_rdma_put_context(ctxt, 0);
383 printk(KERN_ERR "svcrdma: unexpected completion type, "
384 "opcode=%d, status=%d\n",
385 wc.opcode, wc.status);
388 svc_xprt_put(&xprt->sc_xprt);
392 atomic_inc(&rdma_stat_sq_prod);
395 static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
397 struct svcxprt_rdma *xprt = cq_context;
400 /* Guard against unconditional flush call for destroyed QP */
401 if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
405 * Set the bit regardless of whether or not it's on the list
406 * because it may be on the list already due to an RQ
409 set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags);
412 * If this transport is not already on the DTO transport queue,
415 spin_lock_irqsave(&dto_lock, flags);
416 if (list_empty(&xprt->sc_dto_q)) {
417 svc_xprt_get(&xprt->sc_xprt);
418 list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
420 spin_unlock_irqrestore(&dto_lock, flags);
422 /* Tasklet does all the work to avoid irqsave locks. */
423 tasklet_schedule(&dto_tasklet);
426 static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
429 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
433 svc_xprt_init(&svc_rdma_class, &cma_xprt->sc_xprt, serv);
434 INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
435 INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
436 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
437 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
438 INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);
439 init_waitqueue_head(&cma_xprt->sc_send_wait);
441 spin_lock_init(&cma_xprt->sc_lock);
442 spin_lock_init(&cma_xprt->sc_rq_dto_lock);
443 spin_lock_init(&cma_xprt->sc_frmr_q_lock);
445 cma_xprt->sc_ord = svcrdma_ord;
447 cma_xprt->sc_max_req_size = svcrdma_max_req_size;
448 cma_xprt->sc_max_requests = svcrdma_max_requests;
449 cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
450 atomic_set(&cma_xprt->sc_sq_count, 0);
451 atomic_set(&cma_xprt->sc_ctxt_used, 0);
454 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
459 struct page *svc_rdma_get_page(void)
463 while ((page = alloc_page(GFP_KERNEL)) == NULL) {
464 /* If we can't get memory, wait a bit and try again */
465 printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 "
467 schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
472 int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
474 struct ib_recv_wr recv_wr, *bad_recv_wr;
475 struct svc_rdma_op_ctxt *ctxt;
482 ctxt = svc_rdma_get_context(xprt);
484 ctxt->direction = DMA_FROM_DEVICE;
485 for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
486 BUG_ON(sge_no >= xprt->sc_max_sge);
487 page = svc_rdma_get_page();
488 ctxt->pages[sge_no] = page;
489 atomic_inc(&xprt->sc_dma_used);
490 pa = ib_dma_map_page(xprt->sc_cm_id->device,
493 ctxt->sge[sge_no].addr = pa;
494 ctxt->sge[sge_no].length = PAGE_SIZE;
495 ctxt->sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
498 ctxt->count = sge_no;
500 recv_wr.sg_list = &ctxt->sge[0];
501 recv_wr.num_sge = ctxt->count;
502 recv_wr.wr_id = (u64)(unsigned long)ctxt;
504 svc_xprt_get(&xprt->sc_xprt);
505 ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
507 svc_xprt_put(&xprt->sc_xprt);
508 svc_rdma_put_context(ctxt, 1);
514 * This function handles the CONNECT_REQUEST event on a listening
515 * endpoint. It is passed the cma_id for the _new_ connection. The context in
516 * this cma_id is inherited from the listening cma_id and is the svc_xprt
517 * structure for the listening endpoint.
519 * This function creates a new xprt for the new connection and enqueues it on
520 * the accept queue for the listent xprt. When the listen thread is kicked, it
521 * will call the recvfrom method on the listen xprt which will accept the new
524 static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
526 struct svcxprt_rdma *listen_xprt = new_cma_id->context;
527 struct svcxprt_rdma *newxprt;
530 /* Create a new transport */
531 newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
533 dprintk("svcrdma: failed to create new transport\n");
536 newxprt->sc_cm_id = new_cma_id;
537 new_cma_id->context = newxprt;
538 dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
539 newxprt, newxprt->sc_cm_id, listen_xprt);
541 /* Save client advertised inbound read limit for use later in accept. */
542 newxprt->sc_ord = client_ird;
544 /* Set the local and remote addresses in the transport */
545 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
546 svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
547 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
548 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
551 * Enqueue the new transport on the accept queue of the listening
554 spin_lock_bh(&listen_xprt->sc_lock);
555 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
556 spin_unlock_bh(&listen_xprt->sc_lock);
559 * Can't use svc_xprt_received here because we are not on a
562 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
563 svc_xprt_enqueue(&listen_xprt->sc_xprt);
567 * Handles events generated on the listening endpoint. These events will be
568 * either be incoming connect requests or adapter removal events.
570 static int rdma_listen_handler(struct rdma_cm_id *cma_id,
571 struct rdma_cm_event *event)
573 struct svcxprt_rdma *xprt = cma_id->context;
576 switch (event->event) {
577 case RDMA_CM_EVENT_CONNECT_REQUEST:
578 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
579 "event=%d\n", cma_id, cma_id->context, event->event);
580 handle_connect_req(cma_id,
581 event->param.conn.responder_resources);
584 case RDMA_CM_EVENT_ESTABLISHED:
585 /* Accept complete */
586 dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
587 "cm_id=%p\n", xprt, cma_id);
590 case RDMA_CM_EVENT_DEVICE_REMOVAL:
591 dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
594 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
598 dprintk("svcrdma: Unexpected event on listening endpoint %p, "
599 "event=%d\n", cma_id, event->event);
606 static int rdma_cma_handler(struct rdma_cm_id *cma_id,
607 struct rdma_cm_event *event)
609 struct svc_xprt *xprt = cma_id->context;
610 struct svcxprt_rdma *rdma =
611 container_of(xprt, struct svcxprt_rdma, sc_xprt);
612 switch (event->event) {
613 case RDMA_CM_EVENT_ESTABLISHED:
614 /* Accept complete */
616 dprintk("svcrdma: Connection completed on DTO xprt=%p, "
617 "cm_id=%p\n", xprt, cma_id);
618 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
619 svc_xprt_enqueue(xprt);
621 case RDMA_CM_EVENT_DISCONNECTED:
622 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
625 set_bit(XPT_CLOSE, &xprt->xpt_flags);
626 svc_xprt_enqueue(xprt);
630 case RDMA_CM_EVENT_DEVICE_REMOVAL:
631 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
632 "event=%d\n", cma_id, xprt, event->event);
634 set_bit(XPT_CLOSE, &xprt->xpt_flags);
635 svc_xprt_enqueue(xprt);
639 dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
640 "event=%d\n", cma_id, event->event);
647 * Create a listening RDMA service endpoint.
649 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
650 struct sockaddr *sa, int salen,
653 struct rdma_cm_id *listen_id;
654 struct svcxprt_rdma *cma_xprt;
655 struct svc_xprt *xprt;
658 dprintk("svcrdma: Creating RDMA socket\n");
660 cma_xprt = rdma_create_xprt(serv, 1);
662 return ERR_PTR(-ENOMEM);
663 xprt = &cma_xprt->sc_xprt;
665 listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP);
666 if (IS_ERR(listen_id)) {
667 ret = PTR_ERR(listen_id);
668 dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
672 ret = rdma_bind_addr(listen_id, sa);
674 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
677 cma_xprt->sc_cm_id = listen_id;
679 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
681 dprintk("svcrdma: rdma_listen failed = %d\n", ret);
686 * We need to use the address from the cm_id in case the
687 * caller specified 0 for the port number.
689 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
690 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
692 return &cma_xprt->sc_xprt;
695 rdma_destroy_id(listen_id);
701 static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
704 struct ib_fast_reg_page_list *pl;
705 struct svc_rdma_fastreg_mr *frmr;
707 frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
711 mr = ib_alloc_fast_reg_mr(xprt->sc_pd, RPCSVC_MAXPAGES);
715 pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device,
721 frmr->page_list = pl;
722 INIT_LIST_HEAD(&frmr->frmr_list);
730 return ERR_PTR(-ENOMEM);
733 static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
735 struct svc_rdma_fastreg_mr *frmr;
737 while (!list_empty(&xprt->sc_frmr_q)) {
738 frmr = list_entry(xprt->sc_frmr_q.next,
739 struct svc_rdma_fastreg_mr, frmr_list);
740 list_del_init(&frmr->frmr_list);
741 ib_dereg_mr(frmr->mr);
742 ib_free_fast_reg_page_list(frmr->page_list);
747 struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
749 struct svc_rdma_fastreg_mr *frmr = NULL;
751 spin_lock_bh(&rdma->sc_frmr_q_lock);
752 if (!list_empty(&rdma->sc_frmr_q)) {
753 frmr = list_entry(rdma->sc_frmr_q.next,
754 struct svc_rdma_fastreg_mr, frmr_list);
755 list_del_init(&frmr->frmr_list);
757 frmr->page_list_len = 0;
759 spin_unlock_bh(&rdma->sc_frmr_q_lock);
763 return rdma_alloc_frmr(rdma);
766 static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
767 struct svc_rdma_fastreg_mr *frmr)
770 for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
771 dma_addr_t addr = frmr->page_list->page_list[page_no];
772 if (ib_dma_mapping_error(frmr->mr->device, addr))
774 atomic_dec(&xprt->sc_dma_used);
775 ib_dma_unmap_single(frmr->mr->device, addr, PAGE_SIZE,
780 void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
781 struct svc_rdma_fastreg_mr *frmr)
784 frmr_unmap_dma(rdma, frmr);
785 spin_lock_bh(&rdma->sc_frmr_q_lock);
786 BUG_ON(!list_empty(&frmr->frmr_list));
787 list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
788 spin_unlock_bh(&rdma->sc_frmr_q_lock);
793 * This is the xpo_recvfrom function for listening endpoints. Its
794 * purpose is to accept incoming connections. The CMA callback handler
795 * has already created a new transport and attached it to the new CMA
798 * There is a queue of pending connections hung on the listening
799 * transport. This queue contains the new svc_xprt structure. This
800 * function takes svc_xprt structures off the accept_q and completes
803 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
805 struct svcxprt_rdma *listen_rdma;
806 struct svcxprt_rdma *newxprt = NULL;
807 struct rdma_conn_param conn_param;
808 struct ib_qp_init_attr qp_attr;
809 struct ib_device_attr devattr;
813 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
814 clear_bit(XPT_CONN, &xprt->xpt_flags);
815 /* Get the next entry off the accept list */
816 spin_lock_bh(&listen_rdma->sc_lock);
817 if (!list_empty(&listen_rdma->sc_accept_q)) {
818 newxprt = list_entry(listen_rdma->sc_accept_q.next,
819 struct svcxprt_rdma, sc_accept_q);
820 list_del_init(&newxprt->sc_accept_q);
822 if (!list_empty(&listen_rdma->sc_accept_q))
823 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
824 spin_unlock_bh(&listen_rdma->sc_lock);
828 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
829 newxprt, newxprt->sc_cm_id);
831 ret = ib_query_device(newxprt->sc_cm_id->device, &devattr);
833 dprintk("svcrdma: could not query device attributes on "
834 "device %p, rc=%d\n", newxprt->sc_cm_id->device, ret);
838 /* Qualify the transport resource defaults with the
839 * capabilities of this particular device */
840 newxprt->sc_max_sge = min((size_t)devattr.max_sge,
841 (size_t)RPCSVC_MAXPAGES);
842 newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
843 (size_t)svcrdma_max_requests);
844 newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
847 * Limit ORD based on client limit, local device limit, and
848 * configured svcrdma limit.
850 newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord);
851 newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord);
853 newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device);
854 if (IS_ERR(newxprt->sc_pd)) {
855 dprintk("svcrdma: error creating PD for connect request\n");
858 newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device,
862 newxprt->sc_sq_depth,
864 if (IS_ERR(newxprt->sc_sq_cq)) {
865 dprintk("svcrdma: error creating SQ CQ for connect request\n");
868 newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device,
872 newxprt->sc_max_requests,
874 if (IS_ERR(newxprt->sc_rq_cq)) {
875 dprintk("svcrdma: error creating RQ CQ for connect request\n");
879 memset(&qp_attr, 0, sizeof qp_attr);
880 qp_attr.event_handler = qp_event_handler;
881 qp_attr.qp_context = &newxprt->sc_xprt;
882 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
883 qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
884 qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
885 qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
886 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
887 qp_attr.qp_type = IB_QPT_RC;
888 qp_attr.send_cq = newxprt->sc_sq_cq;
889 qp_attr.recv_cq = newxprt->sc_rq_cq;
890 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
891 " cm_id->device=%p, sc_pd->device=%p\n"
892 " cap.max_send_wr = %d\n"
893 " cap.max_recv_wr = %d\n"
894 " cap.max_send_sge = %d\n"
895 " cap.max_recv_sge = %d\n",
896 newxprt->sc_cm_id, newxprt->sc_pd,
897 newxprt->sc_cm_id->device, newxprt->sc_pd->device,
898 qp_attr.cap.max_send_wr,
899 qp_attr.cap.max_recv_wr,
900 qp_attr.cap.max_send_sge,
901 qp_attr.cap.max_recv_sge);
903 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
906 * XXX: This is a hack. We need a xx_request_qp interface
907 * that will adjust the qp_attr's with a best-effort
910 qp_attr.cap.max_send_sge -= 2;
911 qp_attr.cap.max_recv_sge -= 2;
912 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd,
915 dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
918 newxprt->sc_max_sge = qp_attr.cap.max_send_sge;
919 newxprt->sc_max_sge = qp_attr.cap.max_recv_sge;
920 newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
921 newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
923 newxprt->sc_qp = newxprt->sc_cm_id->qp;
925 /* Register all of physical memory */
926 newxprt->sc_phys_mr = ib_get_dma_mr(newxprt->sc_pd,
927 IB_ACCESS_LOCAL_WRITE |
928 IB_ACCESS_REMOTE_WRITE);
929 if (IS_ERR(newxprt->sc_phys_mr)) {
930 dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret);
934 /* Post receive buffers */
935 for (i = 0; i < newxprt->sc_max_requests; i++) {
936 ret = svc_rdma_post_recv(newxprt);
938 dprintk("svcrdma: failure posting receive buffers\n");
943 /* Swap out the handler */
944 newxprt->sc_cm_id->event_handler = rdma_cma_handler;
947 * Arm the CQs for the SQ and RQ before accepting so we can't
948 * miss the first message
950 ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP);
951 ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP);
953 /* Accept Connection */
954 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
955 memset(&conn_param, 0, sizeof conn_param);
956 conn_param.responder_resources = 0;
957 conn_param.initiator_depth = newxprt->sc_ord;
958 ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
960 dprintk("svcrdma: failed to accept new connection, ret=%d\n",
965 dprintk("svcrdma: new connection %p accepted with the following "
967 " local_ip : %d.%d.%d.%d\n"
969 " remote_ip : %d.%d.%d.%d\n"
970 " remote_port : %d\n"
973 " max_requests : %d\n"
976 NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
977 route.addr.src_addr)->sin_addr.s_addr),
978 ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
979 route.addr.src_addr)->sin_port),
980 NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
981 route.addr.dst_addr)->sin_addr.s_addr),
982 ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
983 route.addr.dst_addr)->sin_port),
985 newxprt->sc_sq_depth,
986 newxprt->sc_max_requests,
989 return &newxprt->sc_xprt;
992 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
993 /* Take a reference in case the DTO handler runs */
994 svc_xprt_get(&newxprt->sc_xprt);
995 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
996 ib_destroy_qp(newxprt->sc_qp);
997 rdma_destroy_id(newxprt->sc_cm_id);
998 /* This call to put will destroy the transport */
999 svc_xprt_put(&newxprt->sc_xprt);
1003 static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
1008 * When connected, an svc_xprt has at least two references:
1010 * - A reference held by the cm_id between the ESTABLISHED and
1011 * DISCONNECTED events. If the remote peer disconnected first, this
1012 * reference could be gone.
1014 * - A reference held by the svc_recv code that called this function
1015 * as part of close processing.
1017 * At a minimum one references should still be held.
1019 static void svc_rdma_detach(struct svc_xprt *xprt)
1021 struct svcxprt_rdma *rdma =
1022 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1023 dprintk("svc: svc_rdma_detach(%p)\n", xprt);
1025 /* Disconnect and flush posted WQE */
1026 rdma_disconnect(rdma->sc_cm_id);
1029 static void __svc_rdma_free(struct work_struct *work)
1031 struct svcxprt_rdma *rdma =
1032 container_of(work, struct svcxprt_rdma, sc_work);
1033 dprintk("svcrdma: svc_rdma_free(%p)\n", rdma);
1035 /* We should only be called from kref_put */
1036 BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0);
1039 * Destroy queued, but not processed read completions. Note
1040 * that this cleanup has to be done before destroying the
1041 * cm_id because the device ptr is needed to unmap the dma in
1042 * svc_rdma_put_context.
1044 while (!list_empty(&rdma->sc_read_complete_q)) {
1045 struct svc_rdma_op_ctxt *ctxt;
1046 ctxt = list_entry(rdma->sc_read_complete_q.next,
1047 struct svc_rdma_op_ctxt,
1049 list_del_init(&ctxt->dto_q);
1050 svc_rdma_put_context(ctxt, 1);
1053 /* Destroy queued, but not processed recv completions */
1054 while (!list_empty(&rdma->sc_rq_dto_q)) {
1055 struct svc_rdma_op_ctxt *ctxt;
1056 ctxt = list_entry(rdma->sc_rq_dto_q.next,
1057 struct svc_rdma_op_ctxt,
1059 list_del_init(&ctxt->dto_q);
1060 svc_rdma_put_context(ctxt, 1);
1063 /* Warn if we leaked a resource or under-referenced */
1064 WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);
1065 WARN_ON(atomic_read(&rdma->sc_dma_used) != 0);
1067 /* De-allocate fastreg mr */
1068 rdma_dealloc_frmr_q(rdma);
1070 /* Destroy the QP if present (not a listener) */
1071 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
1072 ib_destroy_qp(rdma->sc_qp);
1074 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
1075 ib_destroy_cq(rdma->sc_sq_cq);
1077 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
1078 ib_destroy_cq(rdma->sc_rq_cq);
1080 if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr))
1081 ib_dereg_mr(rdma->sc_phys_mr);
1083 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
1084 ib_dealloc_pd(rdma->sc_pd);
1086 /* Destroy the CM ID */
1087 rdma_destroy_id(rdma->sc_cm_id);
1092 static void svc_rdma_free(struct svc_xprt *xprt)
1094 struct svcxprt_rdma *rdma =
1095 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1096 INIT_WORK(&rdma->sc_work, __svc_rdma_free);
1097 schedule_work(&rdma->sc_work);
1100 static int svc_rdma_has_wspace(struct svc_xprt *xprt)
1102 struct svcxprt_rdma *rdma =
1103 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1106 * If there are fewer SQ WR available than required to send a
1107 * simple response, return false.
1109 if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3))
1113 * ...or there are already waiters on the SQ,
1116 if (waitqueue_active(&rdma->sc_send_wait))
1119 /* Otherwise return true. */
1123 int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
1125 struct ib_send_wr *bad_wr;
1128 if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
1131 BUG_ON(wr->send_flags != IB_SEND_SIGNALED);
1132 BUG_ON(((struct svc_rdma_op_ctxt *)(unsigned long)wr->wr_id)->wr_op !=
1134 /* If the SQ is full, wait until an SQ entry is available */
1136 spin_lock_bh(&xprt->sc_lock);
1137 if (xprt->sc_sq_depth == atomic_read(&xprt->sc_sq_count)) {
1138 spin_unlock_bh(&xprt->sc_lock);
1139 atomic_inc(&rdma_stat_sq_starve);
1141 /* See if we can opportunistically reap SQ WR to make room */
1144 /* Wait until SQ WR available if SQ still full */
1145 wait_event(xprt->sc_send_wait,
1146 atomic_read(&xprt->sc_sq_count) <
1148 if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
1152 /* Bumped used SQ WR count and post */
1153 svc_xprt_get(&xprt->sc_xprt);
1154 ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
1156 atomic_inc(&xprt->sc_sq_count);
1158 svc_xprt_put(&xprt->sc_xprt);
1159 dprintk("svcrdma: failed to post SQ WR rc=%d, "
1160 "sc_sq_count=%d, sc_sq_depth=%d\n",
1161 ret, atomic_read(&xprt->sc_sq_count),
1164 spin_unlock_bh(&xprt->sc_lock);
1170 void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
1171 enum rpcrdma_errcode err)
1173 struct ib_send_wr err_wr;
1176 struct svc_rdma_op_ctxt *ctxt;
1181 p = svc_rdma_get_page();
1182 va = page_address(p);
1184 /* XDR encode error */
1185 length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
1187 /* Prepare SGE for local address */
1188 atomic_inc(&xprt->sc_dma_used);
1189 sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
1190 p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
1191 sge.lkey = xprt->sc_phys_mr->lkey;
1192 sge.length = length;
1194 ctxt = svc_rdma_get_context(xprt);
1198 /* Prepare SEND WR */
1199 memset(&err_wr, 0, sizeof err_wr);
1200 ctxt->wr_op = IB_WR_SEND;
1201 err_wr.wr_id = (unsigned long)ctxt;
1202 err_wr.sg_list = &sge;
1204 err_wr.opcode = IB_WR_SEND;
1205 err_wr.send_flags = IB_SEND_SIGNALED;
1208 ret = svc_rdma_send(xprt, &err_wr);
1210 dprintk("svcrdma: Error %d posting send for protocol error\n",
1212 svc_rdma_put_context(ctxt, 1);