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TOMOYO Linux Cross Reference
Linux/net/sunrpc/xprtrdma/svc_rdma_sendto.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  3  *
  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
  8  * license below:
  9  *
 10  * Redistribution and use in source and binary forms, with or without
 11  * modification, are permitted provided that the following conditions
 12  * are met:
 13  *
 14  *      Redistributions of source code must retain the above copyright
 15  *      notice, this list of conditions and the following disclaimer.
 16  *
 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.
 21  *
 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
 25  *      permission.
 26  *
 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.
 38  *
 39  * Author: Tom Tucker <tom@opengridcomputing.com>
 40  */
 41 
 42 #include <linux/sunrpc/debug.h>
 43 #include <linux/sunrpc/rpc_rdma.h>
 44 #include <linux/spinlock.h>
 45 #include <asm/unaligned.h>
 46 #include <rdma/ib_verbs.h>
 47 #include <rdma/rdma_cm.h>
 48 #include <linux/sunrpc/svc_rdma.h>
 49 
 50 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
 51 
 52 /* Encode an XDR as an array of IB SGE
 53  *
 54  * Assumptions:
 55  * - head[0] is physically contiguous.
 56  * - tail[0] is physically contiguous.
 57  * - pages[] is not physically or virtually contigous and consists of
 58  *   PAGE_SIZE elements.
 59  *
 60  * Output:
 61  * SGE[0]              reserved for RCPRDMA header
 62  * SGE[1]              data from xdr->head[]
 63  * SGE[2..sge_count-2] data from xdr->pages[]
 64  * SGE[sge_count-1]    data from xdr->tail.
 65  *
 66  * The max SGE we need is the length of the XDR / pagesize + one for
 67  * head + one for tail + one for RPCRDMA header. Since RPCSVC_MAXPAGES
 68  * reserves a page for both the request and the reply header, and this
 69  * array is only concerned with the reply we are assured that we have
 70  * on extra page for the RPCRMDA header.
 71  */
 72 static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 73                  struct xdr_buf *xdr,
 74                  struct svc_rdma_req_map *vec)
 75 {
 76         int sge_no;
 77         u32 sge_bytes;
 78         u32 page_bytes;
 79         u32 page_off;
 80         int page_no = 0;
 81         u8 *frva;
 82         struct svc_rdma_fastreg_mr *frmr;
 83 
 84         frmr = svc_rdma_get_frmr(xprt);
 85         if (IS_ERR(frmr))
 86                 return -ENOMEM;
 87         vec->frmr = frmr;
 88 
 89         /* Skip the RPCRDMA header */
 90         sge_no = 1;
 91 
 92         /* Map the head. */
 93         frva = (void *)((unsigned long)(xdr->head[0].iov_base) & PAGE_MASK);
 94         vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
 95         vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
 96         vec->count = 2;
 97         sge_no++;
 98 
 99         /* Build the FRMR */
100         frmr->kva = frva;
101         frmr->direction = DMA_TO_DEVICE;
102         frmr->access_flags = 0;
103         frmr->map_len = PAGE_SIZE;
104         frmr->page_list_len = 1;
105         frmr->page_list->page_list[page_no] =
106                 ib_dma_map_single(xprt->sc_cm_id->device,
107                                   (void *)xdr->head[0].iov_base,
108                                   PAGE_SIZE, DMA_TO_DEVICE);
109         if (ib_dma_mapping_error(xprt->sc_cm_id->device,
110                                  frmr->page_list->page_list[page_no]))
111                 goto fatal_err;
112         atomic_inc(&xprt->sc_dma_used);
113 
114         page_off = xdr->page_base;
115         page_bytes = xdr->page_len + page_off;
116         if (!page_bytes)
117                 goto encode_tail;
118 
119         /* Map the pages */
120         vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
121         vec->sge[sge_no].iov_len = page_bytes;
122         sge_no++;
123         while (page_bytes) {
124                 struct page *page;
125 
126                 page = xdr->pages[page_no++];
127                 sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
128                 page_bytes -= sge_bytes;
129 
130                 frmr->page_list->page_list[page_no] =
131                         ib_dma_map_single(xprt->sc_cm_id->device,
132                                           page_address(page),
133                                           PAGE_SIZE, DMA_TO_DEVICE);
134                 if (ib_dma_mapping_error(xprt->sc_cm_id->device,
135                                          frmr->page_list->page_list[page_no]))
136                         goto fatal_err;
137 
138                 atomic_inc(&xprt->sc_dma_used);
139                 page_off = 0; /* reset for next time through loop */
140                 frmr->map_len += PAGE_SIZE;
141                 frmr->page_list_len++;
142         }
143         vec->count++;
144 
145  encode_tail:
146         /* Map tail */
147         if (0 == xdr->tail[0].iov_len)
148                 goto done;
149 
150         vec->count++;
151         vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
152 
153         if (((unsigned long)xdr->tail[0].iov_base & PAGE_MASK) ==
154             ((unsigned long)xdr->head[0].iov_base & PAGE_MASK)) {
155                 /*
156                  * If head and tail use the same page, we don't need
157                  * to map it again.
158                  */
159                 vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
160         } else {
161                 void *va;
162 
163                 /* Map another page for the tail */
164                 page_off = (unsigned long)xdr->tail[0].iov_base & ~PAGE_MASK;
165                 va = (void *)((unsigned long)xdr->tail[0].iov_base & PAGE_MASK);
166                 vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
167 
168                 frmr->page_list->page_list[page_no] =
169                         ib_dma_map_single(xprt->sc_cm_id->device, va, PAGE_SIZE,
170                                           DMA_TO_DEVICE);
171                 if (ib_dma_mapping_error(xprt->sc_cm_id->device,
172                                          frmr->page_list->page_list[page_no]))
173                         goto fatal_err;
174                 atomic_inc(&xprt->sc_dma_used);
175                 frmr->map_len += PAGE_SIZE;
176                 frmr->page_list_len++;
177         }
178 
179  done:
180         if (svc_rdma_fastreg(xprt, frmr))
181                 goto fatal_err;
182 
183         return 0;
184 
185  fatal_err:
186         printk("svcrdma: Error fast registering memory for xprt %p\n", xprt);
187         vec->frmr = NULL;
188         svc_rdma_put_frmr(xprt, frmr);
189         return -EIO;
190 }
191 
192 static int map_xdr(struct svcxprt_rdma *xprt,
193                    struct xdr_buf *xdr,
194                    struct svc_rdma_req_map *vec)
195 {
196         int sge_no;
197         u32 sge_bytes;
198         u32 page_bytes;
199         u32 page_off;
200         int page_no;
201 
202         BUG_ON(xdr->len !=
203                (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len));
204 
205         if (xprt->sc_frmr_pg_list_len)
206                 return fast_reg_xdr(xprt, xdr, vec);
207 
208         /* Skip the first sge, this is for the RPCRDMA header */
209         sge_no = 1;
210 
211         /* Head SGE */
212         vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
213         vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
214         sge_no++;
215 
216         /* pages SGE */
217         page_no = 0;
218         page_bytes = xdr->page_len;
219         page_off = xdr->page_base;
220         while (page_bytes) {
221                 vec->sge[sge_no].iov_base =
222                         page_address(xdr->pages[page_no]) + page_off;
223                 sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
224                 page_bytes -= sge_bytes;
225                 vec->sge[sge_no].iov_len = sge_bytes;
226 
227                 sge_no++;
228                 page_no++;
229                 page_off = 0; /* reset for next time through loop */
230         }
231 
232         /* Tail SGE */
233         if (xdr->tail[0].iov_len) {
234                 vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
235                 vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
236                 sge_no++;
237         }
238 
239         dprintk("svcrdma: map_xdr: sge_no %d page_no %d "
240                 "page_base %u page_len %u head_len %zu tail_len %zu\n",
241                 sge_no, page_no, xdr->page_base, xdr->page_len,
242                 xdr->head[0].iov_len, xdr->tail[0].iov_len);
243 
244         vec->count = sge_no;
245         return 0;
246 }
247 
248 /* Assumptions:
249  * - We are using FRMR
250  *     - or -
251  * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
252  */
253 static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
254                       u32 rmr, u64 to,
255                       u32 xdr_off, int write_len,
256                       struct svc_rdma_req_map *vec)
257 {
258         struct ib_send_wr write_wr;
259         struct ib_sge *sge;
260         int xdr_sge_no;
261         int sge_no;
262         int sge_bytes;
263         int sge_off;
264         int bc;
265         struct svc_rdma_op_ctxt *ctxt;
266 
267         BUG_ON(vec->count > RPCSVC_MAXPAGES);
268         dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
269                 "write_len=%d, vec->sge=%p, vec->count=%lu\n",
270                 rmr, (unsigned long long)to, xdr_off,
271                 write_len, vec->sge, vec->count);
272 
273         ctxt = svc_rdma_get_context(xprt);
274         ctxt->direction = DMA_TO_DEVICE;
275         sge = ctxt->sge;
276 
277         /* Find the SGE associated with xdr_off */
278         for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
279              xdr_sge_no++) {
280                 if (vec->sge[xdr_sge_no].iov_len > bc)
281                         break;
282                 bc -= vec->sge[xdr_sge_no].iov_len;
283         }
284 
285         sge_off = bc;
286         bc = write_len;
287         sge_no = 0;
288 
289         /* Copy the remaining SGE */
290         while (bc != 0) {
291                 sge_bytes = min_t(size_t,
292                           bc, vec->sge[xdr_sge_no].iov_len-sge_off);
293                 sge[sge_no].length = sge_bytes;
294                 if (!vec->frmr) {
295                         sge[sge_no].addr =
296                                 ib_dma_map_single(xprt->sc_cm_id->device,
297                                                   (void *)
298                                                   vec->sge[xdr_sge_no].iov_base + sge_off,
299                                                   sge_bytes, DMA_TO_DEVICE);
300                         if (ib_dma_mapping_error(xprt->sc_cm_id->device,
301                                                  sge[sge_no].addr))
302                                 goto err;
303                         atomic_inc(&xprt->sc_dma_used);
304                         sge[sge_no].lkey = xprt->sc_dma_lkey;
305                 } else {
306                         sge[sge_no].addr = (unsigned long)
307                                 vec->sge[xdr_sge_no].iov_base + sge_off;
308                         sge[sge_no].lkey = vec->frmr->mr->lkey;
309                 }
310                 ctxt->count++;
311                 ctxt->frmr = vec->frmr;
312                 sge_off = 0;
313                 sge_no++;
314                 xdr_sge_no++;
315                 BUG_ON(xdr_sge_no > vec->count);
316                 bc -= sge_bytes;
317         }
318 
319         /* Prepare WRITE WR */
320         memset(&write_wr, 0, sizeof write_wr);
321         ctxt->wr_op = IB_WR_RDMA_WRITE;
322         write_wr.wr_id = (unsigned long)ctxt;
323         write_wr.sg_list = &sge[0];
324         write_wr.num_sge = sge_no;
325         write_wr.opcode = IB_WR_RDMA_WRITE;
326         write_wr.send_flags = IB_SEND_SIGNALED;
327         write_wr.wr.rdma.rkey = rmr;
328         write_wr.wr.rdma.remote_addr = to;
329 
330         /* Post It */
331         atomic_inc(&rdma_stat_write);
332         if (svc_rdma_send(xprt, &write_wr))
333                 goto err;
334         return 0;
335  err:
336         svc_rdma_put_context(ctxt, 0);
337         /* Fatal error, close transport */
338         return -EIO;
339 }
340 
341 static int send_write_chunks(struct svcxprt_rdma *xprt,
342                              struct rpcrdma_msg *rdma_argp,
343                              struct rpcrdma_msg *rdma_resp,
344                              struct svc_rqst *rqstp,
345                              struct svc_rdma_req_map *vec)
346 {
347         u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
348         int write_len;
349         int max_write;
350         u32 xdr_off;
351         int chunk_off;
352         int chunk_no;
353         struct rpcrdma_write_array *arg_ary;
354         struct rpcrdma_write_array *res_ary;
355         int ret;
356 
357         arg_ary = svc_rdma_get_write_array(rdma_argp);
358         if (!arg_ary)
359                 return 0;
360         res_ary = (struct rpcrdma_write_array *)
361                 &rdma_resp->rm_body.rm_chunks[1];
362 
363         if (vec->frmr)
364                 max_write = vec->frmr->map_len;
365         else
366                 max_write = xprt->sc_max_sge * PAGE_SIZE;
367 
368         /* Write chunks start at the pagelist */
369         for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
370              xfer_len && chunk_no < arg_ary->wc_nchunks;
371              chunk_no++) {
372                 struct rpcrdma_segment *arg_ch;
373                 u64 rs_offset;
374 
375                 arg_ch = &arg_ary->wc_array[chunk_no].wc_target;
376                 write_len = min(xfer_len, arg_ch->rs_length);
377 
378                 /* Prepare the response chunk given the length actually
379                  * written */
380                 rs_offset = get_unaligned(&(arg_ch->rs_offset));
381                 svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
382                                             arg_ch->rs_handle,
383                                             rs_offset,
384                                             write_len);
385                 chunk_off = 0;
386                 while (write_len) {
387                         int this_write;
388                         this_write = min(write_len, max_write);
389                         ret = send_write(xprt, rqstp,
390                                          arg_ch->rs_handle,
391                                          rs_offset + chunk_off,
392                                          xdr_off,
393                                          this_write,
394                                          vec);
395                         if (ret) {
396                                 dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
397                                         ret);
398                                 return -EIO;
399                         }
400                         chunk_off += this_write;
401                         xdr_off += this_write;
402                         xfer_len -= this_write;
403                         write_len -= this_write;
404                 }
405         }
406         /* Update the req with the number of chunks actually used */
407         svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);
408 
409         return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
410 }
411 
412 static int send_reply_chunks(struct svcxprt_rdma *xprt,
413                              struct rpcrdma_msg *rdma_argp,
414                              struct rpcrdma_msg *rdma_resp,
415                              struct svc_rqst *rqstp,
416                              struct svc_rdma_req_map *vec)
417 {
418         u32 xfer_len = rqstp->rq_res.len;
419         int write_len;
420         int max_write;
421         u32 xdr_off;
422         int chunk_no;
423         int chunk_off;
424         struct rpcrdma_segment *ch;
425         struct rpcrdma_write_array *arg_ary;
426         struct rpcrdma_write_array *res_ary;
427         int ret;
428 
429         arg_ary = svc_rdma_get_reply_array(rdma_argp);
430         if (!arg_ary)
431                 return 0;
432         /* XXX: need to fix when reply lists occur with read-list and or
433          * write-list */
434         res_ary = (struct rpcrdma_write_array *)
435                 &rdma_resp->rm_body.rm_chunks[2];
436 
437         if (vec->frmr)
438                 max_write = vec->frmr->map_len;
439         else
440                 max_write = xprt->sc_max_sge * PAGE_SIZE;
441 
442         /* xdr offset starts at RPC message */
443         for (xdr_off = 0, chunk_no = 0;
444              xfer_len && chunk_no < arg_ary->wc_nchunks;
445              chunk_no++) {
446                 u64 rs_offset;
447                 ch = &arg_ary->wc_array[chunk_no].wc_target;
448                 write_len = min(xfer_len, ch->rs_length);
449 
450                 /* Prepare the reply chunk given the length actually
451                  * written */
452                 rs_offset = get_unaligned(&(ch->rs_offset));
453                 svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
454                                             ch->rs_handle, rs_offset,
455                                             write_len);
456                 chunk_off = 0;
457                 while (write_len) {
458                         int this_write;
459 
460                         this_write = min(write_len, max_write);
461                         ret = send_write(xprt, rqstp,
462                                          ch->rs_handle,
463                                          rs_offset + chunk_off,
464                                          xdr_off,
465                                          this_write,
466                                          vec);
467                         if (ret) {
468                                 dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
469                                         ret);
470                                 return -EIO;
471                         }
472                         chunk_off += this_write;
473                         xdr_off += this_write;
474                         xfer_len -= this_write;
475                         write_len -= this_write;
476                 }
477         }
478         /* Update the req with the number of chunks actually used */
479         svc_rdma_xdr_encode_reply_array(res_ary, chunk_no);
480 
481         return rqstp->rq_res.len;
482 }
483 
484 /* This function prepares the portion of the RPCRDMA message to be
485  * sent in the RDMA_SEND. This function is called after data sent via
486  * RDMA has already been transmitted. There are three cases:
487  * - The RPCRDMA header, RPC header, and payload are all sent in a
488  *   single RDMA_SEND. This is the "inline" case.
489  * - The RPCRDMA header and some portion of the RPC header and data
490  *   are sent via this RDMA_SEND and another portion of the data is
491  *   sent via RDMA.
492  * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
493  *   header and data are all transmitted via RDMA.
494  * In all three cases, this function prepares the RPCRDMA header in
495  * sge[0], the 'type' parameter indicates the type to place in the
496  * RPCRDMA header, and the 'byte_count' field indicates how much of
497  * the XDR to include in this RDMA_SEND.
498  */
499 static int send_reply(struct svcxprt_rdma *rdma,
500                       struct svc_rqst *rqstp,
501                       struct page *page,
502                       struct rpcrdma_msg *rdma_resp,
503                       struct svc_rdma_op_ctxt *ctxt,
504                       struct svc_rdma_req_map *vec,
505                       int byte_count)
506 {
507         struct ib_send_wr send_wr;
508         struct ib_send_wr inv_wr;
509         int sge_no;
510         int sge_bytes;
511         int page_no;
512         int ret;
513 
514         /* Post a recv buffer to handle another request. */
515         ret = svc_rdma_post_recv(rdma);
516         if (ret) {
517                 printk(KERN_INFO
518                        "svcrdma: could not post a receive buffer, err=%d."
519                        "Closing transport %p.\n", ret, rdma);
520                 set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
521                 svc_rdma_put_frmr(rdma, vec->frmr);
522                 svc_rdma_put_context(ctxt, 0);
523                 return -ENOTCONN;
524         }
525 
526         /* Prepare the context */
527         ctxt->pages[0] = page;
528         ctxt->count = 1;
529         ctxt->frmr = vec->frmr;
530         if (vec->frmr)
531                 set_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
532         else
533                 clear_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
534 
535         /* Prepare the SGE for the RPCRDMA Header */
536         ctxt->sge[0].lkey = rdma->sc_dma_lkey;
537         ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
538         ctxt->sge[0].addr =
539                 ib_dma_map_single(rdma->sc_cm_id->device, page_address(page),
540                                   ctxt->sge[0].length, DMA_TO_DEVICE);
541         if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
542                 goto err;
543         atomic_inc(&rdma->sc_dma_used);
544 
545         ctxt->direction = DMA_TO_DEVICE;
546 
547         /* Determine how many of our SGE are to be transmitted */
548         for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
549                 sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
550                 byte_count -= sge_bytes;
551                 if (!vec->frmr) {
552                         ctxt->sge[sge_no].addr =
553                                 ib_dma_map_single(rdma->sc_cm_id->device,
554                                                   vec->sge[sge_no].iov_base,
555                                                   sge_bytes, DMA_TO_DEVICE);
556                         if (ib_dma_mapping_error(rdma->sc_cm_id->device,
557                                                  ctxt->sge[sge_no].addr))
558                                 goto err;
559                         atomic_inc(&rdma->sc_dma_used);
560                         ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
561                 } else {
562                         ctxt->sge[sge_no].addr = (unsigned long)
563                                 vec->sge[sge_no].iov_base;
564                         ctxt->sge[sge_no].lkey = vec->frmr->mr->lkey;
565                 }
566                 ctxt->sge[sge_no].length = sge_bytes;
567         }
568         BUG_ON(byte_count != 0);
569 
570         /* Save all respages in the ctxt and remove them from the
571          * respages array. They are our pages until the I/O
572          * completes.
573          */
574         for (page_no = 0; page_no < rqstp->rq_resused; page_no++) {
575                 ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
576                 ctxt->count++;
577                 rqstp->rq_respages[page_no] = NULL;
578                 /*
579                  * If there are more pages than SGE, terminate SGE
580                  * list so that svc_rdma_unmap_dma doesn't attempt to
581                  * unmap garbage.
582                  */
583                 if (page_no+1 >= sge_no)
584                         ctxt->sge[page_no+1].length = 0;
585         }
586         BUG_ON(sge_no > rdma->sc_max_sge);
587         memset(&send_wr, 0, sizeof send_wr);
588         ctxt->wr_op = IB_WR_SEND;
589         send_wr.wr_id = (unsigned long)ctxt;
590         send_wr.sg_list = ctxt->sge;
591         send_wr.num_sge = sge_no;
592         send_wr.opcode = IB_WR_SEND;
593         send_wr.send_flags =  IB_SEND_SIGNALED;
594         if (vec->frmr) {
595                 /* Prepare INVALIDATE WR */
596                 memset(&inv_wr, 0, sizeof inv_wr);
597                 inv_wr.opcode = IB_WR_LOCAL_INV;
598                 inv_wr.send_flags = IB_SEND_SIGNALED;
599                 inv_wr.ex.invalidate_rkey =
600                         vec->frmr->mr->lkey;
601                 send_wr.next = &inv_wr;
602         }
603 
604         ret = svc_rdma_send(rdma, &send_wr);
605         if (ret)
606                 goto err;
607 
608         return 0;
609 
610  err:
611         svc_rdma_unmap_dma(ctxt);
612         svc_rdma_put_frmr(rdma, vec->frmr);
613         svc_rdma_put_context(ctxt, 1);
614         return -EIO;
615 }
616 
617 void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
618 {
619 }
620 
621 /*
622  * Return the start of an xdr buffer.
623  */
624 static void *xdr_start(struct xdr_buf *xdr)
625 {
626         return xdr->head[0].iov_base -
627                 (xdr->len -
628                  xdr->page_len -
629                  xdr->tail[0].iov_len -
630                  xdr->head[0].iov_len);
631 }
632 
633 int svc_rdma_sendto(struct svc_rqst *rqstp)
634 {
635         struct svc_xprt *xprt = rqstp->rq_xprt;
636         struct svcxprt_rdma *rdma =
637                 container_of(xprt, struct svcxprt_rdma, sc_xprt);
638         struct rpcrdma_msg *rdma_argp;
639         struct rpcrdma_msg *rdma_resp;
640         struct rpcrdma_write_array *reply_ary;
641         enum rpcrdma_proc reply_type;
642         int ret;
643         int inline_bytes;
644         struct page *res_page;
645         struct svc_rdma_op_ctxt *ctxt;
646         struct svc_rdma_req_map *vec;
647 
648         dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
649 
650         /* Get the RDMA request header. */
651         rdma_argp = xdr_start(&rqstp->rq_arg);
652 
653         /* Build an req vec for the XDR */
654         ctxt = svc_rdma_get_context(rdma);
655         ctxt->direction = DMA_TO_DEVICE;
656         vec = svc_rdma_get_req_map();
657         ret = map_xdr(rdma, &rqstp->rq_res, vec);
658         if (ret)
659                 goto err0;
660         inline_bytes = rqstp->rq_res.len;
661 
662         /* Create the RDMA response header */
663         res_page = svc_rdma_get_page();
664         rdma_resp = page_address(res_page);
665         reply_ary = svc_rdma_get_reply_array(rdma_argp);
666         if (reply_ary)
667                 reply_type = RDMA_NOMSG;
668         else
669                 reply_type = RDMA_MSG;
670         svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
671                                          rdma_resp, reply_type);
672 
673         /* Send any write-chunk data and build resp write-list */
674         ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
675                                 rqstp, vec);
676         if (ret < 0) {
677                 printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
678                        ret);
679                 goto err1;
680         }
681         inline_bytes -= ret;
682 
683         /* Send any reply-list data and update resp reply-list */
684         ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
685                                 rqstp, vec);
686         if (ret < 0) {
687                 printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
688                        ret);
689                 goto err1;
690         }
691         inline_bytes -= ret;
692 
693         ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec,
694                          inline_bytes);
695         svc_rdma_put_req_map(vec);
696         dprintk("svcrdma: send_reply returns %d\n", ret);
697         return ret;
698 
699  err1:
700         put_page(res_page);
701  err0:
702         svc_rdma_put_req_map(vec);
703         svc_rdma_put_context(ctxt, 0);
704         return ret;
705 }
706 

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