Commit | Line | Data |
---|---|---|
c06b540a TT |
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 | * | |
34d16e42 TT |
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. | |
c06b540a | 71 | */ |
34d16e42 TT |
72 | static void xdr_to_sge(struct svcxprt_rdma *xprt, |
73 | struct xdr_buf *xdr, | |
74 | struct svc_rdma_req_map *vec) | |
c06b540a | 75 | { |
c06b540a TT |
76 | int sge_max = (xdr->len+PAGE_SIZE-1) / PAGE_SIZE + 3; |
77 | int sge_no; | |
c06b540a TT |
78 | u32 sge_bytes; |
79 | u32 page_bytes; | |
34d16e42 | 80 | u32 page_off; |
c06b540a TT |
81 | int page_no; |
82 | ||
34d16e42 TT |
83 | BUG_ON(xdr->len != |
84 | (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len)); | |
85 | ||
c06b540a TT |
86 | /* Skip the first sge, this is for the RPCRDMA header */ |
87 | sge_no = 1; | |
88 | ||
89 | /* Head SGE */ | |
34d16e42 TT |
90 | vec->sge[sge_no].iov_base = xdr->head[0].iov_base; |
91 | vec->sge[sge_no].iov_len = xdr->head[0].iov_len; | |
c06b540a TT |
92 | sge_no++; |
93 | ||
94 | /* pages SGE */ | |
95 | page_no = 0; | |
96 | page_bytes = xdr->page_len; | |
97 | page_off = xdr->page_base; | |
34d16e42 TT |
98 | while (page_bytes) { |
99 | vec->sge[sge_no].iov_base = | |
100 | page_address(xdr->pages[page_no]) + page_off; | |
101 | sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off)); | |
c06b540a | 102 | page_bytes -= sge_bytes; |
34d16e42 | 103 | vec->sge[sge_no].iov_len = sge_bytes; |
c06b540a TT |
104 | |
105 | sge_no++; | |
106 | page_no++; | |
107 | page_off = 0; /* reset for next time through loop */ | |
108 | } | |
109 | ||
110 | /* Tail SGE */ | |
34d16e42 TT |
111 | if (xdr->tail[0].iov_len) { |
112 | vec->sge[sge_no].iov_base = xdr->tail[0].iov_base; | |
113 | vec->sge[sge_no].iov_len = xdr->tail[0].iov_len; | |
c06b540a TT |
114 | sge_no++; |
115 | } | |
116 | ||
117 | BUG_ON(sge_no > sge_max); | |
34d16e42 | 118 | vec->count = sge_no; |
c06b540a TT |
119 | } |
120 | ||
c06b540a TT |
121 | /* Assumptions: |
122 | * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE | |
123 | */ | |
124 | static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp, | |
125 | u32 rmr, u64 to, | |
126 | u32 xdr_off, int write_len, | |
34d16e42 | 127 | struct svc_rdma_req_map *vec) |
c06b540a | 128 | { |
c06b540a TT |
129 | struct ib_send_wr write_wr; |
130 | struct ib_sge *sge; | |
131 | int xdr_sge_no; | |
132 | int sge_no; | |
133 | int sge_bytes; | |
134 | int sge_off; | |
135 | int bc; | |
136 | struct svc_rdma_op_ctxt *ctxt; | |
c06b540a | 137 | |
34d16e42 | 138 | BUG_ON(vec->count > RPCSVC_MAXPAGES); |
c06b540a | 139 | dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, " |
34d16e42 | 140 | "write_len=%d, vec->sge=%p, vec->count=%lu\n", |
bb50c801 | 141 | rmr, (unsigned long long)to, xdr_off, |
34d16e42 | 142 | write_len, vec->sge, vec->count); |
c06b540a TT |
143 | |
144 | ctxt = svc_rdma_get_context(xprt); | |
34d16e42 TT |
145 | ctxt->direction = DMA_TO_DEVICE; |
146 | sge = ctxt->sge; | |
c06b540a TT |
147 | |
148 | /* Find the SGE associated with xdr_off */ | |
34d16e42 | 149 | for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count; |
c06b540a | 150 | xdr_sge_no++) { |
34d16e42 | 151 | if (vec->sge[xdr_sge_no].iov_len > bc) |
c06b540a | 152 | break; |
34d16e42 | 153 | bc -= vec->sge[xdr_sge_no].iov_len; |
c06b540a TT |
154 | } |
155 | ||
156 | sge_off = bc; | |
157 | bc = write_len; | |
158 | sge_no = 0; | |
159 | ||
160 | /* Copy the remaining SGE */ | |
34d16e42 TT |
161 | while (bc != 0 && xdr_sge_no < vec->count) { |
162 | sge[sge_no].lkey = xprt->sc_phys_mr->lkey; | |
c06b540a | 163 | sge_bytes = min((size_t)bc, |
34d16e42 | 164 | (size_t)(vec->sge[xdr_sge_no].iov_len-sge_off)); |
c06b540a | 165 | sge[sge_no].length = sge_bytes; |
87295b6c | 166 | atomic_inc(&xprt->sc_dma_used); |
34d16e42 TT |
167 | sge[sge_no].addr = |
168 | ib_dma_map_single(xprt->sc_cm_id->device, | |
169 | (void *) | |
170 | vec->sge[xdr_sge_no].iov_base + sge_off, | |
171 | sge_bytes, DMA_TO_DEVICE); | |
8d8bb39b FT |
172 | if (dma_mapping_error(xprt->sc_cm_id->device->dma_device, |
173 | sge[sge_no].addr)) | |
34d16e42 | 174 | goto err; |
c06b540a TT |
175 | sge_off = 0; |
176 | sge_no++; | |
34d16e42 | 177 | ctxt->count++; |
c06b540a TT |
178 | xdr_sge_no++; |
179 | bc -= sge_bytes; | |
180 | } | |
181 | ||
182 | BUG_ON(bc != 0); | |
34d16e42 | 183 | BUG_ON(xdr_sge_no > vec->count); |
c06b540a TT |
184 | |
185 | /* Prepare WRITE WR */ | |
186 | memset(&write_wr, 0, sizeof write_wr); | |
187 | ctxt->wr_op = IB_WR_RDMA_WRITE; | |
188 | write_wr.wr_id = (unsigned long)ctxt; | |
189 | write_wr.sg_list = &sge[0]; | |
190 | write_wr.num_sge = sge_no; | |
191 | write_wr.opcode = IB_WR_RDMA_WRITE; | |
192 | write_wr.send_flags = IB_SEND_SIGNALED; | |
193 | write_wr.wr.rdma.rkey = rmr; | |
194 | write_wr.wr.rdma.remote_addr = to; | |
195 | ||
196 | /* Post It */ | |
197 | atomic_inc(&rdma_stat_write); | |
34d16e42 TT |
198 | if (svc_rdma_send(xprt, &write_wr)) |
199 | goto err; | |
200 | return 0; | |
201 | err: | |
202 | svc_rdma_put_context(ctxt, 0); | |
203 | /* Fatal error, close transport */ | |
204 | return -EIO; | |
c06b540a TT |
205 | } |
206 | ||
207 | static int send_write_chunks(struct svcxprt_rdma *xprt, | |
208 | struct rpcrdma_msg *rdma_argp, | |
209 | struct rpcrdma_msg *rdma_resp, | |
210 | struct svc_rqst *rqstp, | |
34d16e42 | 211 | struct svc_rdma_req_map *vec) |
c06b540a TT |
212 | { |
213 | u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len; | |
214 | int write_len; | |
215 | int max_write; | |
216 | u32 xdr_off; | |
217 | int chunk_off; | |
218 | int chunk_no; | |
219 | struct rpcrdma_write_array *arg_ary; | |
220 | struct rpcrdma_write_array *res_ary; | |
221 | int ret; | |
222 | ||
223 | arg_ary = svc_rdma_get_write_array(rdma_argp); | |
224 | if (!arg_ary) | |
225 | return 0; | |
226 | res_ary = (struct rpcrdma_write_array *) | |
227 | &rdma_resp->rm_body.rm_chunks[1]; | |
228 | ||
229 | max_write = xprt->sc_max_sge * PAGE_SIZE; | |
230 | ||
231 | /* Write chunks start at the pagelist */ | |
232 | for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0; | |
233 | xfer_len && chunk_no < arg_ary->wc_nchunks; | |
234 | chunk_no++) { | |
235 | struct rpcrdma_segment *arg_ch; | |
236 | u64 rs_offset; | |
237 | ||
238 | arg_ch = &arg_ary->wc_array[chunk_no].wc_target; | |
239 | write_len = min(xfer_len, arg_ch->rs_length); | |
240 | ||
241 | /* Prepare the response chunk given the length actually | |
242 | * written */ | |
243 | rs_offset = get_unaligned(&(arg_ch->rs_offset)); | |
244 | svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no, | |
245 | arg_ch->rs_handle, | |
246 | rs_offset, | |
247 | write_len); | |
248 | chunk_off = 0; | |
249 | while (write_len) { | |
250 | int this_write; | |
251 | this_write = min(write_len, max_write); | |
252 | ret = send_write(xprt, rqstp, | |
253 | arg_ch->rs_handle, | |
254 | rs_offset + chunk_off, | |
255 | xdr_off, | |
256 | this_write, | |
34d16e42 | 257 | vec); |
c06b540a TT |
258 | if (ret) { |
259 | dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n", | |
260 | ret); | |
261 | return -EIO; | |
262 | } | |
263 | chunk_off += this_write; | |
264 | xdr_off += this_write; | |
265 | xfer_len -= this_write; | |
266 | write_len -= this_write; | |
267 | } | |
268 | } | |
269 | /* Update the req with the number of chunks actually used */ | |
270 | svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no); | |
271 | ||
272 | return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len; | |
273 | } | |
274 | ||
275 | static int send_reply_chunks(struct svcxprt_rdma *xprt, | |
276 | struct rpcrdma_msg *rdma_argp, | |
277 | struct rpcrdma_msg *rdma_resp, | |
278 | struct svc_rqst *rqstp, | |
34d16e42 | 279 | struct svc_rdma_req_map *vec) |
c06b540a TT |
280 | { |
281 | u32 xfer_len = rqstp->rq_res.len; | |
282 | int write_len; | |
283 | int max_write; | |
284 | u32 xdr_off; | |
285 | int chunk_no; | |
286 | int chunk_off; | |
287 | struct rpcrdma_segment *ch; | |
288 | struct rpcrdma_write_array *arg_ary; | |
289 | struct rpcrdma_write_array *res_ary; | |
290 | int ret; | |
291 | ||
292 | arg_ary = svc_rdma_get_reply_array(rdma_argp); | |
293 | if (!arg_ary) | |
294 | return 0; | |
295 | /* XXX: need to fix when reply lists occur with read-list and or | |
296 | * write-list */ | |
297 | res_ary = (struct rpcrdma_write_array *) | |
298 | &rdma_resp->rm_body.rm_chunks[2]; | |
299 | ||
300 | max_write = xprt->sc_max_sge * PAGE_SIZE; | |
301 | ||
302 | /* xdr offset starts at RPC message */ | |
303 | for (xdr_off = 0, chunk_no = 0; | |
304 | xfer_len && chunk_no < arg_ary->wc_nchunks; | |
305 | chunk_no++) { | |
306 | u64 rs_offset; | |
307 | ch = &arg_ary->wc_array[chunk_no].wc_target; | |
308 | write_len = min(xfer_len, ch->rs_length); | |
309 | ||
310 | ||
311 | /* Prepare the reply chunk given the length actually | |
312 | * written */ | |
313 | rs_offset = get_unaligned(&(ch->rs_offset)); | |
314 | svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no, | |
315 | ch->rs_handle, rs_offset, | |
316 | write_len); | |
317 | chunk_off = 0; | |
318 | while (write_len) { | |
319 | int this_write; | |
320 | ||
321 | this_write = min(write_len, max_write); | |
322 | ret = send_write(xprt, rqstp, | |
323 | ch->rs_handle, | |
324 | rs_offset + chunk_off, | |
325 | xdr_off, | |
326 | this_write, | |
34d16e42 | 327 | vec); |
c06b540a TT |
328 | if (ret) { |
329 | dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n", | |
330 | ret); | |
331 | return -EIO; | |
332 | } | |
333 | chunk_off += this_write; | |
334 | xdr_off += this_write; | |
335 | xfer_len -= this_write; | |
336 | write_len -= this_write; | |
337 | } | |
338 | } | |
339 | /* Update the req with the number of chunks actually used */ | |
340 | svc_rdma_xdr_encode_reply_array(res_ary, chunk_no); | |
341 | ||
342 | return rqstp->rq_res.len; | |
343 | } | |
344 | ||
345 | /* This function prepares the portion of the RPCRDMA message to be | |
346 | * sent in the RDMA_SEND. This function is called after data sent via | |
347 | * RDMA has already been transmitted. There are three cases: | |
348 | * - The RPCRDMA header, RPC header, and payload are all sent in a | |
349 | * single RDMA_SEND. This is the "inline" case. | |
350 | * - The RPCRDMA header and some portion of the RPC header and data | |
351 | * are sent via this RDMA_SEND and another portion of the data is | |
352 | * sent via RDMA. | |
353 | * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC | |
354 | * header and data are all transmitted via RDMA. | |
355 | * In all three cases, this function prepares the RPCRDMA header in | |
356 | * sge[0], the 'type' parameter indicates the type to place in the | |
357 | * RPCRDMA header, and the 'byte_count' field indicates how much of | |
358 | * the XDR to include in this RDMA_SEND. | |
359 | */ | |
360 | static int send_reply(struct svcxprt_rdma *rdma, | |
361 | struct svc_rqst *rqstp, | |
362 | struct page *page, | |
363 | struct rpcrdma_msg *rdma_resp, | |
364 | struct svc_rdma_op_ctxt *ctxt, | |
34d16e42 | 365 | struct svc_rdma_req_map *vec, |
c06b540a TT |
366 | int byte_count) |
367 | { | |
368 | struct ib_send_wr send_wr; | |
369 | int sge_no; | |
370 | int sge_bytes; | |
371 | int page_no; | |
372 | int ret; | |
373 | ||
0e7f011a TT |
374 | /* Post a recv buffer to handle another request. */ |
375 | ret = svc_rdma_post_recv(rdma); | |
376 | if (ret) { | |
377 | printk(KERN_INFO | |
378 | "svcrdma: could not post a receive buffer, err=%d." | |
379 | "Closing transport %p.\n", ret, rdma); | |
380 | set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags); | |
5ac461a6 TT |
381 | svc_rdma_put_context(ctxt, 0); |
382 | return -ENOTCONN; | |
0e7f011a TT |
383 | } |
384 | ||
c06b540a TT |
385 | /* Prepare the context */ |
386 | ctxt->pages[0] = page; | |
387 | ctxt->count = 1; | |
388 | ||
389 | /* Prepare the SGE for the RPCRDMA Header */ | |
87295b6c | 390 | atomic_inc(&rdma->sc_dma_used); |
c06b540a TT |
391 | ctxt->sge[0].addr = |
392 | ib_dma_map_page(rdma->sc_cm_id->device, | |
393 | page, 0, PAGE_SIZE, DMA_TO_DEVICE); | |
394 | ctxt->direction = DMA_TO_DEVICE; | |
395 | ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp); | |
396 | ctxt->sge[0].lkey = rdma->sc_phys_mr->lkey; | |
397 | ||
398 | /* Determine how many of our SGE are to be transmitted */ | |
34d16e42 TT |
399 | for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) { |
400 | sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count); | |
c06b540a | 401 | byte_count -= sge_bytes; |
87295b6c | 402 | atomic_inc(&rdma->sc_dma_used); |
34d16e42 TT |
403 | ctxt->sge[sge_no].addr = |
404 | ib_dma_map_single(rdma->sc_cm_id->device, | |
405 | vec->sge[sge_no].iov_base, | |
406 | sge_bytes, DMA_TO_DEVICE); | |
407 | ctxt->sge[sge_no].length = sge_bytes; | |
408 | ctxt->sge[sge_no].lkey = rdma->sc_phys_mr->lkey; | |
c06b540a TT |
409 | } |
410 | BUG_ON(byte_count != 0); | |
411 | ||
412 | /* Save all respages in the ctxt and remove them from the | |
413 | * respages array. They are our pages until the I/O | |
414 | * completes. | |
415 | */ | |
416 | for (page_no = 0; page_no < rqstp->rq_resused; page_no++) { | |
417 | ctxt->pages[page_no+1] = rqstp->rq_respages[page_no]; | |
418 | ctxt->count++; | |
419 | rqstp->rq_respages[page_no] = NULL; | |
34d16e42 TT |
420 | /* If there are more pages than SGE, terminate SGE list */ |
421 | if (page_no+1 >= sge_no) | |
422 | ctxt->sge[page_no+1].length = 0; | |
c06b540a | 423 | } |
c06b540a TT |
424 | BUG_ON(sge_no > rdma->sc_max_sge); |
425 | memset(&send_wr, 0, sizeof send_wr); | |
426 | ctxt->wr_op = IB_WR_SEND; | |
427 | send_wr.wr_id = (unsigned long)ctxt; | |
428 | send_wr.sg_list = ctxt->sge; | |
429 | send_wr.num_sge = sge_no; | |
430 | send_wr.opcode = IB_WR_SEND; | |
431 | send_wr.send_flags = IB_SEND_SIGNALED; | |
432 | ||
433 | ret = svc_rdma_send(rdma, &send_wr); | |
434 | if (ret) | |
435 | svc_rdma_put_context(ctxt, 1); | |
436 | ||
437 | return ret; | |
438 | } | |
439 | ||
440 | void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp) | |
441 | { | |
442 | } | |
443 | ||
444 | /* | |
445 | * Return the start of an xdr buffer. | |
446 | */ | |
447 | static void *xdr_start(struct xdr_buf *xdr) | |
448 | { | |
449 | return xdr->head[0].iov_base - | |
450 | (xdr->len - | |
451 | xdr->page_len - | |
452 | xdr->tail[0].iov_len - | |
453 | xdr->head[0].iov_len); | |
454 | } | |
455 | ||
456 | int svc_rdma_sendto(struct svc_rqst *rqstp) | |
457 | { | |
458 | struct svc_xprt *xprt = rqstp->rq_xprt; | |
459 | struct svcxprt_rdma *rdma = | |
460 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
461 | struct rpcrdma_msg *rdma_argp; | |
462 | struct rpcrdma_msg *rdma_resp; | |
463 | struct rpcrdma_write_array *reply_ary; | |
464 | enum rpcrdma_proc reply_type; | |
465 | int ret; | |
466 | int inline_bytes; | |
c06b540a TT |
467 | struct page *res_page; |
468 | struct svc_rdma_op_ctxt *ctxt; | |
34d16e42 | 469 | struct svc_rdma_req_map *vec; |
c06b540a TT |
470 | |
471 | dprintk("svcrdma: sending response for rqstp=%p\n", rqstp); | |
472 | ||
473 | /* Get the RDMA request header. */ | |
474 | rdma_argp = xdr_start(&rqstp->rq_arg); | |
475 | ||
34d16e42 | 476 | /* Build an req vec for the XDR */ |
c06b540a TT |
477 | ctxt = svc_rdma_get_context(rdma); |
478 | ctxt->direction = DMA_TO_DEVICE; | |
34d16e42 TT |
479 | vec = svc_rdma_get_req_map(); |
480 | xdr_to_sge(rdma, &rqstp->rq_res, vec); | |
c06b540a TT |
481 | |
482 | inline_bytes = rqstp->rq_res.len; | |
483 | ||
484 | /* Create the RDMA response header */ | |
485 | res_page = svc_rdma_get_page(); | |
486 | rdma_resp = page_address(res_page); | |
487 | reply_ary = svc_rdma_get_reply_array(rdma_argp); | |
488 | if (reply_ary) | |
489 | reply_type = RDMA_NOMSG; | |
490 | else | |
491 | reply_type = RDMA_MSG; | |
492 | svc_rdma_xdr_encode_reply_header(rdma, rdma_argp, | |
493 | rdma_resp, reply_type); | |
494 | ||
495 | /* Send any write-chunk data and build resp write-list */ | |
496 | ret = send_write_chunks(rdma, rdma_argp, rdma_resp, | |
34d16e42 | 497 | rqstp, vec); |
c06b540a TT |
498 | if (ret < 0) { |
499 | printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n", | |
500 | ret); | |
501 | goto error; | |
502 | } | |
503 | inline_bytes -= ret; | |
504 | ||
505 | /* Send any reply-list data and update resp reply-list */ | |
506 | ret = send_reply_chunks(rdma, rdma_argp, rdma_resp, | |
34d16e42 | 507 | rqstp, vec); |
c06b540a TT |
508 | if (ret < 0) { |
509 | printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n", | |
510 | ret); | |
511 | goto error; | |
512 | } | |
513 | inline_bytes -= ret; | |
514 | ||
34d16e42 | 515 | ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec, |
c06b540a | 516 | inline_bytes); |
34d16e42 | 517 | svc_rdma_put_req_map(vec); |
c06b540a TT |
518 | dprintk("svcrdma: send_reply returns %d\n", ret); |
519 | return ret; | |
520 | error: | |
34d16e42 | 521 | svc_rdma_put_req_map(vec); |
c06b540a TT |
522 | svc_rdma_put_context(ctxt, 0); |
523 | put_page(res_page); | |
524 | return ret; | |
525 | } |