1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
3 * Copyright (c) 2016-2018 Oracle. All rights reserved.
4 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 * Author: Tom Tucker <tom@opengridcomputing.com>
47 * The main entry point is svc_rdma_recvfrom. This is called from
48 * svc_recv when the transport indicates there is incoming data to
49 * be read. "Data Ready" is signaled when an RDMA Receive completes,
50 * or when a set of RDMA Reads complete.
52 * An svc_rqst is passed in. This structure contains an array of
53 * free pages (rq_pages) that will contain the incoming RPC message.
55 * Short messages are moved directly into svc_rqst::rq_arg, and
56 * the RPC Call is ready to be processed by the Upper Layer.
57 * svc_rdma_recvfrom returns the length of the RPC Call message,
58 * completing the reception of the RPC Call.
60 * However, when an incoming message has Read chunks,
61 * svc_rdma_recvfrom must post RDMA Reads to pull the RPC Call's
62 * data payload from the client. svc_rdma_recvfrom sets up the
63 * RDMA Reads using pages in svc_rqst::rq_pages, which are
64 * transferred to an svc_rdma_recv_ctxt for the duration of the
65 * I/O. svc_rdma_recvfrom then returns zero, since the RPC message
66 * is still not yet ready.
68 * When the Read chunk payloads have become available on the
69 * server, "Data Ready" is raised again, and svc_recv calls
70 * svc_rdma_recvfrom again. This second call may use a different
71 * svc_rqst than the first one, thus any information that needs
72 * to be preserved across these two calls is kept in an
75 * The second call to svc_rdma_recvfrom performs final assembly
76 * of the RPC Call message, using the RDMA Read sink pages kept in
77 * the svc_rdma_recv_ctxt. The xdr_buf is copied from the
78 * svc_rdma_recv_ctxt to the second svc_rqst. The second call returns
79 * the length of the completed RPC Call message.
83 * Pages under I/O must be transferred from the first svc_rqst to an
84 * svc_rdma_recv_ctxt before the first svc_rdma_recvfrom call returns.
86 * The first svc_rqst supplies pages for RDMA Reads. These are moved
87 * from rqstp::rq_pages into ctxt::pages. The consumed elements of
88 * the rq_pages array are set to NULL and refilled with the first
89 * svc_rdma_recvfrom call returns.
91 * During the second svc_rdma_recvfrom call, RDMA Read sink pages
92 * are transferred from the svc_rdma_recv_ctxt to the second svc_rqst
93 * (see rdma_read_complete() below).
96 #include <linux/spinlock.h>
97 #include <asm/unaligned.h>
98 #include <rdma/ib_verbs.h>
99 #include <rdma/rdma_cm.h>
101 #include <linux/sunrpc/xdr.h>
102 #include <linux/sunrpc/debug.h>
103 #include <linux/sunrpc/rpc_rdma.h>
104 #include <linux/sunrpc/svc_rdma.h>
106 #include "xprt_rdma.h"
107 #include <trace/events/rpcrdma.h>
109 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
111 static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc);
113 static inline struct svc_rdma_recv_ctxt *
114 svc_rdma_next_recv_ctxt(struct list_head *list)
116 return list_first_entry_or_null(list, struct svc_rdma_recv_ctxt,
120 static struct svc_rdma_recv_ctxt *
121 svc_rdma_recv_ctxt_alloc(struct svcxprt_rdma *rdma)
123 struct svc_rdma_recv_ctxt *ctxt;
127 ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
130 buffer = kmalloc(rdma->sc_max_req_size, GFP_KERNEL);
133 addr = ib_dma_map_single(rdma->sc_pd->device, buffer,
134 rdma->sc_max_req_size, DMA_FROM_DEVICE);
135 if (ib_dma_mapping_error(rdma->sc_pd->device, addr))
138 ctxt->rc_recv_wr.next = NULL;
139 ctxt->rc_recv_wr.wr_cqe = &ctxt->rc_cqe;
140 ctxt->rc_recv_wr.sg_list = &ctxt->rc_recv_sge;
141 ctxt->rc_recv_wr.num_sge = 1;
142 ctxt->rc_cqe.done = svc_rdma_wc_receive;
143 ctxt->rc_recv_sge.addr = addr;
144 ctxt->rc_recv_sge.length = rdma->sc_max_req_size;
145 ctxt->rc_recv_sge.lkey = rdma->sc_pd->local_dma_lkey;
146 ctxt->rc_recv_buf = buffer;
147 ctxt->rc_temp = false;
158 static void svc_rdma_recv_ctxt_destroy(struct svcxprt_rdma *rdma,
159 struct svc_rdma_recv_ctxt *ctxt)
161 ib_dma_unmap_single(rdma->sc_pd->device, ctxt->rc_recv_sge.addr,
162 ctxt->rc_recv_sge.length, DMA_FROM_DEVICE);
163 kfree(ctxt->rc_recv_buf);
168 * svc_rdma_recv_ctxts_destroy - Release all recv_ctxt's for an xprt
169 * @rdma: svcxprt_rdma being torn down
172 void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma)
174 struct svc_rdma_recv_ctxt *ctxt;
176 while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts))) {
177 list_del(&ctxt->rc_list);
178 svc_rdma_recv_ctxt_destroy(rdma, ctxt);
182 static struct svc_rdma_recv_ctxt *
183 svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma)
185 struct svc_rdma_recv_ctxt *ctxt;
187 spin_lock(&rdma->sc_recv_lock);
188 ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts);
191 list_del(&ctxt->rc_list);
192 spin_unlock(&rdma->sc_recv_lock);
195 ctxt->rc_page_count = 0;
199 spin_unlock(&rdma->sc_recv_lock);
201 ctxt = svc_rdma_recv_ctxt_alloc(rdma);
208 * svc_rdma_recv_ctxt_put - Return recv_ctxt to free list
209 * @rdma: controlling svcxprt_rdma
210 * @ctxt: object to return to the free list
213 void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
214 struct svc_rdma_recv_ctxt *ctxt)
218 for (i = 0; i < ctxt->rc_page_count; i++)
219 put_page(ctxt->rc_pages[i]);
221 if (!ctxt->rc_temp) {
222 spin_lock(&rdma->sc_recv_lock);
223 list_add(&ctxt->rc_list, &rdma->sc_recv_ctxts);
224 spin_unlock(&rdma->sc_recv_lock);
226 svc_rdma_recv_ctxt_destroy(rdma, ctxt);
230 * svc_rdma_release_rqst - Release transport-specific per-rqst resources
231 * @rqstp: svc_rqst being released
233 * Ensure that the recv_ctxt is released whether or not a Reply
234 * was sent. For example, the client could close the connection,
235 * or svc_process could drop an RPC, before the Reply is sent.
237 void svc_rdma_release_rqst(struct svc_rqst *rqstp)
239 struct svc_rdma_recv_ctxt *ctxt = rqstp->rq_xprt_ctxt;
240 struct svc_xprt *xprt = rqstp->rq_xprt;
241 struct svcxprt_rdma *rdma =
242 container_of(xprt, struct svcxprt_rdma, sc_xprt);
244 rqstp->rq_xprt_ctxt = NULL;
246 svc_rdma_recv_ctxt_put(rdma, ctxt);
249 static int __svc_rdma_post_recv(struct svcxprt_rdma *rdma,
250 struct svc_rdma_recv_ctxt *ctxt)
254 svc_xprt_get(&rdma->sc_xprt);
255 ret = ib_post_recv(rdma->sc_qp, &ctxt->rc_recv_wr, NULL);
256 trace_svcrdma_post_recv(&ctxt->rc_recv_wr, ret);
262 svc_rdma_recv_ctxt_put(rdma, ctxt);
263 svc_xprt_put(&rdma->sc_xprt);
267 static int svc_rdma_post_recv(struct svcxprt_rdma *rdma)
269 struct svc_rdma_recv_ctxt *ctxt;
271 if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))
273 ctxt = svc_rdma_recv_ctxt_get(rdma);
276 return __svc_rdma_post_recv(rdma, ctxt);
280 * svc_rdma_post_recvs - Post initial set of Recv WRs
281 * @rdma: fresh svcxprt_rdma
283 * Returns true if successful, otherwise false.
285 bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma)
287 struct svc_rdma_recv_ctxt *ctxt;
291 for (i = 0; i < rdma->sc_max_requests; i++) {
292 ctxt = svc_rdma_recv_ctxt_get(rdma);
295 ctxt->rc_temp = true;
296 ret = __svc_rdma_post_recv(rdma, ctxt);
298 pr_err("svcrdma: failure posting recv buffers: %d\n",
307 * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
308 * @cq: Completion Queue context
309 * @wc: Work Completion object
311 * NB: The svc_xprt/svcxprt_rdma is pinned whenever it's possible that
312 * the Receive completion handler could be running.
314 static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
316 struct svcxprt_rdma *rdma = cq->cq_context;
317 struct ib_cqe *cqe = wc->wr_cqe;
318 struct svc_rdma_recv_ctxt *ctxt;
320 trace_svcrdma_wc_receive(wc);
322 /* WARNING: Only wc->wr_cqe and wc->status are reliable */
323 ctxt = container_of(cqe, struct svc_rdma_recv_ctxt, rc_cqe);
325 if (wc->status != IB_WC_SUCCESS)
328 if (svc_rdma_post_recv(rdma))
331 /* All wc fields are now known to be valid */
332 ctxt->rc_byte_len = wc->byte_len;
333 ib_dma_sync_single_for_cpu(rdma->sc_pd->device,
334 ctxt->rc_recv_sge.addr,
335 wc->byte_len, DMA_FROM_DEVICE);
337 spin_lock(&rdma->sc_rq_dto_lock);
338 list_add_tail(&ctxt->rc_list, &rdma->sc_rq_dto_q);
339 spin_unlock(&rdma->sc_rq_dto_lock);
340 set_bit(XPT_DATA, &rdma->sc_xprt.xpt_flags);
341 if (!test_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags))
342 svc_xprt_enqueue(&rdma->sc_xprt);
346 if (wc->status != IB_WC_WR_FLUSH_ERR)
347 pr_err("svcrdma: Recv: %s (%u/0x%x)\n",
348 ib_wc_status_msg(wc->status),
349 wc->status, wc->vendor_err);
351 svc_rdma_recv_ctxt_put(rdma, ctxt);
352 set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
353 svc_xprt_enqueue(&rdma->sc_xprt);
355 svc_xprt_put(&rdma->sc_xprt);
359 * svc_rdma_flush_recv_queues - Drain pending Receive work
360 * @rdma: svcxprt_rdma being shut down
363 void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma)
365 struct svc_rdma_recv_ctxt *ctxt;
367 while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_read_complete_q))) {
368 list_del(&ctxt->rc_list);
369 svc_rdma_recv_ctxt_put(rdma, ctxt);
371 while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_rq_dto_q))) {
372 list_del(&ctxt->rc_list);
373 svc_rdma_recv_ctxt_put(rdma, ctxt);
377 static void svc_rdma_build_arg_xdr(struct svc_rqst *rqstp,
378 struct svc_rdma_recv_ctxt *ctxt)
380 struct xdr_buf *arg = &rqstp->rq_arg;
382 arg->head[0].iov_base = ctxt->rc_recv_buf;
383 arg->head[0].iov_len = ctxt->rc_byte_len;
384 arg->tail[0].iov_base = NULL;
385 arg->tail[0].iov_len = 0;
388 arg->buflen = ctxt->rc_byte_len;
389 arg->len = ctxt->rc_byte_len;
392 /* This accommodates the largest possible Write chunk,
395 #define MAX_BYTES_WRITE_SEG ((u32)(RPCSVC_MAXPAGES << PAGE_SHIFT))
397 /* This accommodates the largest possible Position-Zero
398 * Read chunk or Reply chunk, in one segment.
400 #define MAX_BYTES_SPECIAL_SEG ((u32)((RPCSVC_MAXPAGES + 2) << PAGE_SHIFT))
402 /* Sanity check the Read list.
404 * Implementation limits:
405 * - This implementation supports only one Read chunk.
408 * - Read list does not overflow buffer.
409 * - Segment size limited by largest NFS data payload.
411 * The segment count is limited to how many segments can
412 * fit in the transport header without overflowing the
413 * buffer. That's about 40 Read segments for a 1KB inline
416 * Returns pointer to the following Write list.
418 static __be32 *xdr_check_read_list(__be32 *p, const __be32 *end)
424 while (*p++ != xdr_zero) {
426 position = be32_to_cpup(p++);
428 } else if (be32_to_cpup(p++) != position) {
432 if (be32_to_cpup(p++) > MAX_BYTES_SPECIAL_SEG)
442 /* The segment count is limited to how many segments can
443 * fit in the transport header without overflowing the
444 * buffer. That's about 60 Write segments for a 1KB inline
447 static __be32 *xdr_check_write_chunk(__be32 *p, const __be32 *end,
452 segcount = be32_to_cpup(p++);
453 for (i = 0; i < segcount; i++) {
455 if (be32_to_cpup(p++) > maxlen)
466 /* Sanity check the Write list.
468 * Implementation limits:
469 * - This implementation supports only one Write chunk.
472 * - Write list does not overflow buffer.
473 * - Segment size limited by largest NFS data payload.
475 * Returns pointer to the following Reply chunk.
477 static __be32 *xdr_check_write_list(__be32 *p, const __be32 *end)
482 while (*p++ != xdr_zero) {
483 p = xdr_check_write_chunk(p, end, MAX_BYTES_WRITE_SEG);
492 /* Sanity check the Reply chunk.
495 * - Reply chunk does not overflow buffer.
496 * - Segment size limited by largest NFS data payload.
498 * Returns pointer to the following RPC header.
500 static __be32 *xdr_check_reply_chunk(__be32 *p, const __be32 *end)
502 if (*p++ != xdr_zero) {
503 p = xdr_check_write_chunk(p, end, MAX_BYTES_SPECIAL_SEG);
510 /* On entry, xdr->head[0].iov_base points to first byte in the
511 * RPC-over-RDMA header.
513 * On successful exit, head[0] points to first byte past the
514 * RPC-over-RDMA header. For RDMA_MSG, this is the RPC message.
515 * The length of the RPC-over-RDMA header is returned.
518 * - The transport header is entirely contained in the head iovec.
520 static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
522 __be32 *p, *end, *rdma_argp;
523 unsigned int hdr_len;
525 /* Verify that there's enough bytes for header + something */
526 if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
529 rdma_argp = rq_arg->head[0].iov_base;
530 if (*(rdma_argp + 1) != rpcrdma_version)
533 switch (*(rdma_argp + 3)) {
549 end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
550 p = xdr_check_read_list(rdma_argp + 4, end);
553 p = xdr_check_write_list(p, end);
556 p = xdr_check_reply_chunk(p, end);
562 rq_arg->head[0].iov_base = p;
563 hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
564 rq_arg->head[0].iov_len -= hdr_len;
565 rq_arg->len -= hdr_len;
566 trace_svcrdma_decode_rqst(rdma_argp, hdr_len);
570 trace_svcrdma_decode_short(rq_arg->len);
574 trace_svcrdma_decode_badvers(rdma_argp);
575 return -EPROTONOSUPPORT;
578 trace_svcrdma_decode_drop(rdma_argp);
582 trace_svcrdma_decode_badproc(rdma_argp);
586 trace_svcrdma_decode_parse(rdma_argp);
590 static void rdma_read_complete(struct svc_rqst *rqstp,
591 struct svc_rdma_recv_ctxt *head)
595 /* Move Read chunk pages to rqstp so that they will be released
596 * when svc_process is done with them.
598 for (page_no = 0; page_no < head->rc_page_count; page_no++) {
599 put_page(rqstp->rq_pages[page_no]);
600 rqstp->rq_pages[page_no] = head->rc_pages[page_no];
602 head->rc_page_count = 0;
604 /* Point rq_arg.pages past header */
605 rqstp->rq_arg.pages = &rqstp->rq_pages[head->rc_hdr_count];
606 rqstp->rq_arg.page_len = head->rc_arg.page_len;
608 /* rq_respages starts after the last arg page */
609 rqstp->rq_respages = &rqstp->rq_pages[page_no];
610 rqstp->rq_next_page = rqstp->rq_respages + 1;
612 /* Rebuild rq_arg head and tail. */
613 rqstp->rq_arg.head[0] = head->rc_arg.head[0];
614 rqstp->rq_arg.tail[0] = head->rc_arg.tail[0];
615 rqstp->rq_arg.len = head->rc_arg.len;
616 rqstp->rq_arg.buflen = head->rc_arg.buflen;
619 static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
620 __be32 *rdma_argp, int status)
622 struct svc_rdma_send_ctxt *ctxt;
627 ctxt = svc_rdma_send_ctxt_get(xprt);
631 p = ctxt->sc_xprt_buf;
633 *p++ = *(rdma_argp + 1);
634 *p++ = xprt->sc_fc_credits;
637 case -EPROTONOSUPPORT:
639 *p++ = rpcrdma_version;
640 *p++ = rpcrdma_version;
641 trace_svcrdma_err_vers(*rdma_argp);
645 trace_svcrdma_err_chunk(*rdma_argp);
647 length = (unsigned long)p - (unsigned long)ctxt->sc_xprt_buf;
648 svc_rdma_sync_reply_hdr(xprt, ctxt, length);
650 ctxt->sc_send_wr.opcode = IB_WR_SEND;
651 ret = svc_rdma_send(xprt, &ctxt->sc_send_wr);
653 svc_rdma_send_ctxt_put(xprt, ctxt);
656 /* By convention, backchannel calls arrive via rdma_msg type
657 * messages, and never populate the chunk lists. This makes
658 * the RPC/RDMA header small and fixed in size, so it is
659 * straightforward to check the RPC header's direction field.
661 static bool svc_rdma_is_backchannel_reply(struct svc_xprt *xprt,
666 if (!xprt->xpt_bc_xprt)
670 if (*p++ != rdma_msg)
673 if (*p++ != xdr_zero)
675 if (*p++ != xdr_zero)
677 if (*p++ != xdr_zero)
681 if (*p++ != *rdma_resp)
684 if (*p == cpu_to_be32(RPC_CALL))
691 * svc_rdma_recvfrom - Receive an RPC call
692 * @rqstp: request structure into which to receive an RPC Call
695 * The positive number of bytes in the RPC Call message,
696 * %0 if there were no Calls ready to return,
697 * %-EINVAL if the Read chunk data is too large,
698 * %-ENOMEM if rdma_rw context pool was exhausted,
699 * %-ENOTCONN if posting failed (connection is lost),
700 * %-EIO if rdma_rw initialization failed (DMA mapping, etc).
702 * Called in a loop when XPT_DATA is set. XPT_DATA is cleared only
703 * when there are no remaining ctxt's to process.
705 * The next ctxt is removed from the "receive" lists.
707 * - If the ctxt completes a Read, then finish assembling the Call
708 * message and return the number of bytes in the message.
710 * - If the ctxt completes a Receive, then construct the Call
711 * message from the contents of the Receive buffer.
713 * - If there are no Read chunks in this message, then finish
714 * assembling the Call message and return the number of bytes
717 * - If there are Read chunks in this message, post Read WRs to
718 * pull that payload and return 0.
720 int svc_rdma_recvfrom(struct svc_rqst *rqstp)
722 struct svc_xprt *xprt = rqstp->rq_xprt;
723 struct svcxprt_rdma *rdma_xprt =
724 container_of(xprt, struct svcxprt_rdma, sc_xprt);
725 struct svc_rdma_recv_ctxt *ctxt;
729 rqstp->rq_xprt_ctxt = NULL;
731 spin_lock(&rdma_xprt->sc_rq_dto_lock);
732 ctxt = svc_rdma_next_recv_ctxt(&rdma_xprt->sc_read_complete_q);
734 list_del(&ctxt->rc_list);
735 spin_unlock(&rdma_xprt->sc_rq_dto_lock);
736 rdma_read_complete(rqstp, ctxt);
739 ctxt = svc_rdma_next_recv_ctxt(&rdma_xprt->sc_rq_dto_q);
741 /* No new incoming requests, terminate the loop */
742 clear_bit(XPT_DATA, &xprt->xpt_flags);
743 spin_unlock(&rdma_xprt->sc_rq_dto_lock);
746 list_del(&ctxt->rc_list);
747 spin_unlock(&rdma_xprt->sc_rq_dto_lock);
749 atomic_inc(&rdma_stat_recv);
751 svc_rdma_build_arg_xdr(rqstp, ctxt);
753 /* Prevent svc_xprt_release from releasing pages in rq_pages
754 * if we return 0 or an error.
756 rqstp->rq_respages = rqstp->rq_pages;
757 rqstp->rq_next_page = rqstp->rq_respages;
759 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
760 ret = svc_rdma_xdr_decode_req(&rqstp->rq_arg);
765 rqstp->rq_xprt_hlen = ret;
767 if (svc_rdma_is_backchannel_reply(xprt, p)) {
768 ret = svc_rdma_handle_bc_reply(xprt->xpt_bc_xprt, p,
770 svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
774 p += rpcrdma_fixed_maxsz;
779 rqstp->rq_xprt_ctxt = ctxt;
780 rqstp->rq_prot = IPPROTO_MAX;
781 svc_xprt_copy_addrs(rqstp, xprt);
782 return rqstp->rq_arg.len;
785 ret = svc_rdma_recv_read_chunk(rdma_xprt, rqstp, ctxt, p);
791 svc_rdma_send_error(rdma_xprt, p, ret);
792 svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
797 svc_rdma_send_error(rdma_xprt, p, ret);
798 svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
802 svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);