Commit | Line | Data |
---|---|---|
c06b540a | 1 | /* |
0bf48289 | 2 | * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. |
c06b540a TT |
3 | * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the BSD-type | |
9 | * license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials provided | |
21 | * with the distribution. | |
22 | * | |
23 | * Neither the name of the Network Appliance, Inc. nor the names of | |
24 | * its contributors may be used to endorse or promote products | |
25 | * derived from this software without specific prior written | |
26 | * permission. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
29 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
30 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
31 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
32 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
33 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
34 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
38 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | * | |
40 | * Author: Tom Tucker <tom@opengridcomputing.com> | |
41 | */ | |
42 | ||
43 | #include <linux/sunrpc/debug.h> | |
44 | #include <linux/sunrpc/rpc_rdma.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <asm/unaligned.h> | |
47 | #include <rdma/ib_verbs.h> | |
48 | #include <rdma/rdma_cm.h> | |
49 | #include <linux/sunrpc/svc_rdma.h> | |
50 | ||
51 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT | |
52 | ||
afd566ea TT |
53 | static int map_xdr(struct svcxprt_rdma *xprt, |
54 | struct xdr_buf *xdr, | |
55 | struct svc_rdma_req_map *vec) | |
c06b540a | 56 | { |
c06b540a | 57 | int sge_no; |
c06b540a TT |
58 | u32 sge_bytes; |
59 | u32 page_bytes; | |
34d16e42 | 60 | u32 page_off; |
c06b540a TT |
61 | int page_no; |
62 | ||
34d16e42 TT |
63 | BUG_ON(xdr->len != |
64 | (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len)); | |
65 | ||
c06b540a TT |
66 | /* Skip the first sge, this is for the RPCRDMA header */ |
67 | sge_no = 1; | |
68 | ||
69 | /* Head SGE */ | |
34d16e42 TT |
70 | vec->sge[sge_no].iov_base = xdr->head[0].iov_base; |
71 | vec->sge[sge_no].iov_len = xdr->head[0].iov_len; | |
c06b540a TT |
72 | sge_no++; |
73 | ||
74 | /* pages SGE */ | |
75 | page_no = 0; | |
76 | page_bytes = xdr->page_len; | |
77 | page_off = xdr->page_base; | |
34d16e42 TT |
78 | while (page_bytes) { |
79 | vec->sge[sge_no].iov_base = | |
80 | page_address(xdr->pages[page_no]) + page_off; | |
81 | sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off)); | |
c06b540a | 82 | page_bytes -= sge_bytes; |
34d16e42 | 83 | vec->sge[sge_no].iov_len = sge_bytes; |
c06b540a TT |
84 | |
85 | sge_no++; | |
86 | page_no++; | |
87 | page_off = 0; /* reset for next time through loop */ | |
88 | } | |
89 | ||
90 | /* Tail SGE */ | |
34d16e42 TT |
91 | if (xdr->tail[0].iov_len) { |
92 | vec->sge[sge_no].iov_base = xdr->tail[0].iov_base; | |
93 | vec->sge[sge_no].iov_len = xdr->tail[0].iov_len; | |
c06b540a TT |
94 | sge_no++; |
95 | } | |
96 | ||
b1e1e158 | 97 | dprintk("svcrdma: map_xdr: sge_no %d page_no %d " |
2e3c230b | 98 | "page_base %u page_len %u head_len %zu tail_len %zu\n", |
b1e1e158 TT |
99 | sge_no, page_no, xdr->page_base, xdr->page_len, |
100 | xdr->head[0].iov_len, xdr->tail[0].iov_len); | |
101 | ||
34d16e42 | 102 | vec->count = sge_no; |
afd566ea | 103 | return 0; |
c06b540a TT |
104 | } |
105 | ||
b432e6b3 TT |
106 | static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt, |
107 | struct xdr_buf *xdr, | |
108 | u32 xdr_off, size_t len, int dir) | |
109 | { | |
110 | struct page *page; | |
111 | dma_addr_t dma_addr; | |
112 | if (xdr_off < xdr->head[0].iov_len) { | |
113 | /* This offset is in the head */ | |
114 | xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK; | |
115 | page = virt_to_page(xdr->head[0].iov_base); | |
116 | } else { | |
117 | xdr_off -= xdr->head[0].iov_len; | |
118 | if (xdr_off < xdr->page_len) { | |
119 | /* This offset is in the page list */ | |
3cbe01a9 | 120 | xdr_off += xdr->page_base; |
b432e6b3 TT |
121 | page = xdr->pages[xdr_off >> PAGE_SHIFT]; |
122 | xdr_off &= ~PAGE_MASK; | |
123 | } else { | |
124 | /* This offset is in the tail */ | |
125 | xdr_off -= xdr->page_len; | |
126 | xdr_off += (unsigned long) | |
127 | xdr->tail[0].iov_base & ~PAGE_MASK; | |
128 | page = virt_to_page(xdr->tail[0].iov_base); | |
129 | } | |
130 | } | |
131 | dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off, | |
132 | min_t(size_t, PAGE_SIZE, len), dir); | |
133 | return dma_addr; | |
134 | } | |
135 | ||
c06b540a TT |
136 | /* Assumptions: |
137 | * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE | |
138 | */ | |
139 | static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp, | |
140 | u32 rmr, u64 to, | |
141 | u32 xdr_off, int write_len, | |
34d16e42 | 142 | struct svc_rdma_req_map *vec) |
c06b540a | 143 | { |
c06b540a TT |
144 | struct ib_send_wr write_wr; |
145 | struct ib_sge *sge; | |
146 | int xdr_sge_no; | |
147 | int sge_no; | |
148 | int sge_bytes; | |
149 | int sge_off; | |
150 | int bc; | |
151 | struct svc_rdma_op_ctxt *ctxt; | |
c06b540a | 152 | |
34d16e42 | 153 | BUG_ON(vec->count > RPCSVC_MAXPAGES); |
c06b540a | 154 | dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, " |
34d16e42 | 155 | "write_len=%d, vec->sge=%p, vec->count=%lu\n", |
bb50c801 | 156 | rmr, (unsigned long long)to, xdr_off, |
34d16e42 | 157 | write_len, vec->sge, vec->count); |
c06b540a TT |
158 | |
159 | ctxt = svc_rdma_get_context(xprt); | |
34d16e42 TT |
160 | ctxt->direction = DMA_TO_DEVICE; |
161 | sge = ctxt->sge; | |
c06b540a TT |
162 | |
163 | /* Find the SGE associated with xdr_off */ | |
34d16e42 | 164 | for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count; |
c06b540a | 165 | xdr_sge_no++) { |
34d16e42 | 166 | if (vec->sge[xdr_sge_no].iov_len > bc) |
c06b540a | 167 | break; |
34d16e42 | 168 | bc -= vec->sge[xdr_sge_no].iov_len; |
c06b540a TT |
169 | } |
170 | ||
171 | sge_off = bc; | |
172 | bc = write_len; | |
173 | sge_no = 0; | |
174 | ||
175 | /* Copy the remaining SGE */ | |
afd566ea TT |
176 | while (bc != 0) { |
177 | sge_bytes = min_t(size_t, | |
178 | bc, vec->sge[xdr_sge_no].iov_len-sge_off); | |
c06b540a | 179 | sge[sge_no].length = sge_bytes; |
0bf48289 SW |
180 | sge[sge_no].addr = |
181 | dma_map_xdr(xprt, &rqstp->rq_res, xdr_off, | |
182 | sge_bytes, DMA_TO_DEVICE); | |
183 | xdr_off += sge_bytes; | |
184 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, | |
185 | sge[sge_no].addr)) | |
186 | goto err; | |
187 | atomic_inc(&xprt->sc_dma_used); | |
188 | sge[sge_no].lkey = xprt->sc_dma_lkey; | |
afd566ea | 189 | ctxt->count++; |
c06b540a TT |
190 | sge_off = 0; |
191 | sge_no++; | |
192 | xdr_sge_no++; | |
afd566ea | 193 | BUG_ON(xdr_sge_no > vec->count); |
c06b540a | 194 | bc -= sge_bytes; |
25594290 SW |
195 | if (sge_no == xprt->sc_max_sge) |
196 | break; | |
c06b540a TT |
197 | } |
198 | ||
c06b540a TT |
199 | /* Prepare WRITE WR */ |
200 | memset(&write_wr, 0, sizeof write_wr); | |
201 | ctxt->wr_op = IB_WR_RDMA_WRITE; | |
202 | write_wr.wr_id = (unsigned long)ctxt; | |
203 | write_wr.sg_list = &sge[0]; | |
204 | write_wr.num_sge = sge_no; | |
205 | write_wr.opcode = IB_WR_RDMA_WRITE; | |
206 | write_wr.send_flags = IB_SEND_SIGNALED; | |
207 | write_wr.wr.rdma.rkey = rmr; | |
208 | write_wr.wr.rdma.remote_addr = to; | |
209 | ||
210 | /* Post It */ | |
211 | atomic_inc(&rdma_stat_write); | |
34d16e42 TT |
212 | if (svc_rdma_send(xprt, &write_wr)) |
213 | goto err; | |
25594290 | 214 | return write_len - bc; |
34d16e42 | 215 | err: |
4a84386f | 216 | svc_rdma_unmap_dma(ctxt); |
34d16e42 TT |
217 | svc_rdma_put_context(ctxt, 0); |
218 | /* Fatal error, close transport */ | |
219 | return -EIO; | |
c06b540a TT |
220 | } |
221 | ||
222 | static int send_write_chunks(struct svcxprt_rdma *xprt, | |
223 | struct rpcrdma_msg *rdma_argp, | |
224 | struct rpcrdma_msg *rdma_resp, | |
225 | struct svc_rqst *rqstp, | |
34d16e42 | 226 | struct svc_rdma_req_map *vec) |
c06b540a TT |
227 | { |
228 | u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len; | |
229 | int write_len; | |
c06b540a TT |
230 | u32 xdr_off; |
231 | int chunk_off; | |
232 | int chunk_no; | |
233 | struct rpcrdma_write_array *arg_ary; | |
234 | struct rpcrdma_write_array *res_ary; | |
235 | int ret; | |
236 | ||
237 | arg_ary = svc_rdma_get_write_array(rdma_argp); | |
238 | if (!arg_ary) | |
239 | return 0; | |
240 | res_ary = (struct rpcrdma_write_array *) | |
241 | &rdma_resp->rm_body.rm_chunks[1]; | |
242 | ||
c06b540a TT |
243 | /* Write chunks start at the pagelist */ |
244 | for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0; | |
245 | xfer_len && chunk_no < arg_ary->wc_nchunks; | |
246 | chunk_no++) { | |
247 | struct rpcrdma_segment *arg_ch; | |
248 | u64 rs_offset; | |
249 | ||
250 | arg_ch = &arg_ary->wc_array[chunk_no].wc_target; | |
cec56c8f | 251 | write_len = min(xfer_len, ntohl(arg_ch->rs_length)); |
c06b540a TT |
252 | |
253 | /* Prepare the response chunk given the length actually | |
254 | * written */ | |
cec56c8f | 255 | xdr_decode_hyper((__be32 *)&arg_ch->rs_offset, &rs_offset); |
c06b540a | 256 | svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no, |
cec56c8f TT |
257 | arg_ch->rs_handle, |
258 | arg_ch->rs_offset, | |
259 | write_len); | |
c06b540a TT |
260 | chunk_off = 0; |
261 | while (write_len) { | |
c06b540a | 262 | ret = send_write(xprt, rqstp, |
cec56c8f | 263 | ntohl(arg_ch->rs_handle), |
c06b540a TT |
264 | rs_offset + chunk_off, |
265 | xdr_off, | |
25594290 | 266 | write_len, |
34d16e42 | 267 | vec); |
25594290 | 268 | if (ret <= 0) { |
c06b540a TT |
269 | dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n", |
270 | ret); | |
271 | return -EIO; | |
272 | } | |
25594290 SW |
273 | chunk_off += ret; |
274 | xdr_off += ret; | |
275 | xfer_len -= ret; | |
276 | write_len -= ret; | |
c06b540a TT |
277 | } |
278 | } | |
279 | /* Update the req with the number of chunks actually used */ | |
280 | svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no); | |
281 | ||
282 | return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len; | |
283 | } | |
284 | ||
285 | static int send_reply_chunks(struct svcxprt_rdma *xprt, | |
286 | struct rpcrdma_msg *rdma_argp, | |
287 | struct rpcrdma_msg *rdma_resp, | |
288 | struct svc_rqst *rqstp, | |
34d16e42 | 289 | struct svc_rdma_req_map *vec) |
c06b540a TT |
290 | { |
291 | u32 xfer_len = rqstp->rq_res.len; | |
292 | int write_len; | |
c06b540a TT |
293 | u32 xdr_off; |
294 | int chunk_no; | |
295 | int chunk_off; | |
cec56c8f | 296 | int nchunks; |
c06b540a TT |
297 | struct rpcrdma_segment *ch; |
298 | struct rpcrdma_write_array *arg_ary; | |
299 | struct rpcrdma_write_array *res_ary; | |
300 | int ret; | |
301 | ||
302 | arg_ary = svc_rdma_get_reply_array(rdma_argp); | |
303 | if (!arg_ary) | |
304 | return 0; | |
305 | /* XXX: need to fix when reply lists occur with read-list and or | |
306 | * write-list */ | |
307 | res_ary = (struct rpcrdma_write_array *) | |
308 | &rdma_resp->rm_body.rm_chunks[2]; | |
309 | ||
c06b540a | 310 | /* xdr offset starts at RPC message */ |
cec56c8f | 311 | nchunks = ntohl(arg_ary->wc_nchunks); |
c06b540a | 312 | for (xdr_off = 0, chunk_no = 0; |
cec56c8f | 313 | xfer_len && chunk_no < nchunks; |
c06b540a TT |
314 | chunk_no++) { |
315 | u64 rs_offset; | |
316 | ch = &arg_ary->wc_array[chunk_no].wc_target; | |
cec56c8f | 317 | write_len = min(xfer_len, htonl(ch->rs_length)); |
c06b540a | 318 | |
c06b540a TT |
319 | /* Prepare the reply chunk given the length actually |
320 | * written */ | |
cec56c8f | 321 | xdr_decode_hyper((__be32 *)&ch->rs_offset, &rs_offset); |
c06b540a | 322 | svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no, |
cec56c8f TT |
323 | ch->rs_handle, ch->rs_offset, |
324 | write_len); | |
c06b540a TT |
325 | chunk_off = 0; |
326 | while (write_len) { | |
c06b540a | 327 | ret = send_write(xprt, rqstp, |
cec56c8f | 328 | ntohl(ch->rs_handle), |
c06b540a TT |
329 | rs_offset + chunk_off, |
330 | xdr_off, | |
25594290 | 331 | write_len, |
34d16e42 | 332 | vec); |
25594290 | 333 | if (ret <= 0) { |
c06b540a TT |
334 | dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n", |
335 | ret); | |
336 | return -EIO; | |
337 | } | |
25594290 SW |
338 | chunk_off += ret; |
339 | xdr_off += ret; | |
340 | xfer_len -= ret; | |
341 | write_len -= ret; | |
c06b540a TT |
342 | } |
343 | } | |
344 | /* Update the req with the number of chunks actually used */ | |
345 | svc_rdma_xdr_encode_reply_array(res_ary, chunk_no); | |
346 | ||
347 | return rqstp->rq_res.len; | |
348 | } | |
349 | ||
350 | /* This function prepares the portion of the RPCRDMA message to be | |
351 | * sent in the RDMA_SEND. This function is called after data sent via | |
352 | * RDMA has already been transmitted. There are three cases: | |
353 | * - The RPCRDMA header, RPC header, and payload are all sent in a | |
354 | * single RDMA_SEND. This is the "inline" case. | |
355 | * - The RPCRDMA header and some portion of the RPC header and data | |
356 | * are sent via this RDMA_SEND and another portion of the data is | |
357 | * sent via RDMA. | |
358 | * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC | |
359 | * header and data are all transmitted via RDMA. | |
360 | * In all three cases, this function prepares the RPCRDMA header in | |
361 | * sge[0], the 'type' parameter indicates the type to place in the | |
362 | * RPCRDMA header, and the 'byte_count' field indicates how much of | |
b432e6b3 TT |
363 | * the XDR to include in this RDMA_SEND. NB: The offset of the payload |
364 | * to send is zero in the XDR. | |
c06b540a TT |
365 | */ |
366 | static int send_reply(struct svcxprt_rdma *rdma, | |
367 | struct svc_rqst *rqstp, | |
368 | struct page *page, | |
369 | struct rpcrdma_msg *rdma_resp, | |
370 | struct svc_rdma_op_ctxt *ctxt, | |
34d16e42 | 371 | struct svc_rdma_req_map *vec, |
c06b540a TT |
372 | int byte_count) |
373 | { | |
374 | struct ib_send_wr send_wr; | |
375 | int sge_no; | |
376 | int sge_bytes; | |
377 | int page_no; | |
afc59400 | 378 | int pages; |
c06b540a TT |
379 | int ret; |
380 | ||
0e7f011a TT |
381 | /* Post a recv buffer to handle another request. */ |
382 | ret = svc_rdma_post_recv(rdma); | |
383 | if (ret) { | |
384 | printk(KERN_INFO | |
385 | "svcrdma: could not post a receive buffer, err=%d." | |
386 | "Closing transport %p.\n", ret, rdma); | |
387 | set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags); | |
5ac461a6 TT |
388 | svc_rdma_put_context(ctxt, 0); |
389 | return -ENOTCONN; | |
0e7f011a TT |
390 | } |
391 | ||
c06b540a TT |
392 | /* Prepare the context */ |
393 | ctxt->pages[0] = page; | |
394 | ctxt->count = 1; | |
395 | ||
396 | /* Prepare the SGE for the RPCRDMA Header */ | |
98779be8 SW |
397 | ctxt->sge[0].lkey = rdma->sc_dma_lkey; |
398 | ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp); | |
c06b540a | 399 | ctxt->sge[0].addr = |
b432e6b3 TT |
400 | ib_dma_map_page(rdma->sc_cm_id->device, page, 0, |
401 | ctxt->sge[0].length, DMA_TO_DEVICE); | |
afd566ea TT |
402 | if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr)) |
403 | goto err; | |
404 | atomic_inc(&rdma->sc_dma_used); | |
405 | ||
c06b540a | 406 | ctxt->direction = DMA_TO_DEVICE; |
afd566ea | 407 | |
b432e6b3 | 408 | /* Map the payload indicated by 'byte_count' */ |
34d16e42 | 409 | for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) { |
b432e6b3 | 410 | int xdr_off = 0; |
34d16e42 | 411 | sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count); |
c06b540a | 412 | byte_count -= sge_bytes; |
0bf48289 SW |
413 | ctxt->sge[sge_no].addr = |
414 | dma_map_xdr(rdma, &rqstp->rq_res, xdr_off, | |
415 | sge_bytes, DMA_TO_DEVICE); | |
416 | xdr_off += sge_bytes; | |
417 | if (ib_dma_mapping_error(rdma->sc_cm_id->device, | |
418 | ctxt->sge[sge_no].addr)) | |
419 | goto err; | |
420 | atomic_inc(&rdma->sc_dma_used); | |
421 | ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey; | |
34d16e42 | 422 | ctxt->sge[sge_no].length = sge_bytes; |
c06b540a TT |
423 | } |
424 | BUG_ON(byte_count != 0); | |
425 | ||
426 | /* Save all respages in the ctxt and remove them from the | |
427 | * respages array. They are our pages until the I/O | |
428 | * completes. | |
429 | */ | |
afc59400 BF |
430 | pages = rqstp->rq_next_page - rqstp->rq_respages; |
431 | for (page_no = 0; page_no < pages; page_no++) { | |
c06b540a TT |
432 | ctxt->pages[page_no+1] = rqstp->rq_respages[page_no]; |
433 | ctxt->count++; | |
434 | rqstp->rq_respages[page_no] = NULL; | |
afd566ea TT |
435 | /* |
436 | * If there are more pages than SGE, terminate SGE | |
437 | * list so that svc_rdma_unmap_dma doesn't attempt to | |
438 | * unmap garbage. | |
439 | */ | |
34d16e42 TT |
440 | if (page_no+1 >= sge_no) |
441 | ctxt->sge[page_no+1].length = 0; | |
c06b540a | 442 | } |
7e4359e2 | 443 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
0bf48289 | 444 | |
c06b540a TT |
445 | BUG_ON(sge_no > rdma->sc_max_sge); |
446 | memset(&send_wr, 0, sizeof send_wr); | |
447 | ctxt->wr_op = IB_WR_SEND; | |
448 | send_wr.wr_id = (unsigned long)ctxt; | |
449 | send_wr.sg_list = ctxt->sge; | |
450 | send_wr.num_sge = sge_no; | |
451 | send_wr.opcode = IB_WR_SEND; | |
452 | send_wr.send_flags = IB_SEND_SIGNALED; | |
453 | ||
454 | ret = svc_rdma_send(rdma, &send_wr); | |
455 | if (ret) | |
afd566ea | 456 | goto err; |
c06b540a | 457 | |
afd566ea TT |
458 | return 0; |
459 | ||
460 | err: | |
21515e46 | 461 | svc_rdma_unmap_dma(ctxt); |
afd566ea TT |
462 | svc_rdma_put_context(ctxt, 1); |
463 | return -EIO; | |
c06b540a TT |
464 | } |
465 | ||
466 | void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp) | |
467 | { | |
468 | } | |
469 | ||
470 | /* | |
471 | * Return the start of an xdr buffer. | |
472 | */ | |
473 | static void *xdr_start(struct xdr_buf *xdr) | |
474 | { | |
475 | return xdr->head[0].iov_base - | |
476 | (xdr->len - | |
477 | xdr->page_len - | |
478 | xdr->tail[0].iov_len - | |
479 | xdr->head[0].iov_len); | |
480 | } | |
481 | ||
482 | int svc_rdma_sendto(struct svc_rqst *rqstp) | |
483 | { | |
484 | struct svc_xprt *xprt = rqstp->rq_xprt; | |
485 | struct svcxprt_rdma *rdma = | |
486 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
487 | struct rpcrdma_msg *rdma_argp; | |
488 | struct rpcrdma_msg *rdma_resp; | |
489 | struct rpcrdma_write_array *reply_ary; | |
490 | enum rpcrdma_proc reply_type; | |
491 | int ret; | |
492 | int inline_bytes; | |
c06b540a TT |
493 | struct page *res_page; |
494 | struct svc_rdma_op_ctxt *ctxt; | |
34d16e42 | 495 | struct svc_rdma_req_map *vec; |
c06b540a TT |
496 | |
497 | dprintk("svcrdma: sending response for rqstp=%p\n", rqstp); | |
498 | ||
499 | /* Get the RDMA request header. */ | |
500 | rdma_argp = xdr_start(&rqstp->rq_arg); | |
501 | ||
34d16e42 | 502 | /* Build an req vec for the XDR */ |
c06b540a TT |
503 | ctxt = svc_rdma_get_context(rdma); |
504 | ctxt->direction = DMA_TO_DEVICE; | |
34d16e42 | 505 | vec = svc_rdma_get_req_map(); |
afd566ea TT |
506 | ret = map_xdr(rdma, &rqstp->rq_res, vec); |
507 | if (ret) | |
508 | goto err0; | |
c06b540a TT |
509 | inline_bytes = rqstp->rq_res.len; |
510 | ||
511 | /* Create the RDMA response header */ | |
512 | res_page = svc_rdma_get_page(); | |
513 | rdma_resp = page_address(res_page); | |
514 | reply_ary = svc_rdma_get_reply_array(rdma_argp); | |
515 | if (reply_ary) | |
516 | reply_type = RDMA_NOMSG; | |
517 | else | |
518 | reply_type = RDMA_MSG; | |
519 | svc_rdma_xdr_encode_reply_header(rdma, rdma_argp, | |
520 | rdma_resp, reply_type); | |
521 | ||
522 | /* Send any write-chunk data and build resp write-list */ | |
523 | ret = send_write_chunks(rdma, rdma_argp, rdma_resp, | |
34d16e42 | 524 | rqstp, vec); |
c06b540a TT |
525 | if (ret < 0) { |
526 | printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n", | |
527 | ret); | |
afd566ea | 528 | goto err1; |
c06b540a TT |
529 | } |
530 | inline_bytes -= ret; | |
531 | ||
532 | /* Send any reply-list data and update resp reply-list */ | |
533 | ret = send_reply_chunks(rdma, rdma_argp, rdma_resp, | |
34d16e42 | 534 | rqstp, vec); |
c06b540a TT |
535 | if (ret < 0) { |
536 | printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n", | |
537 | ret); | |
afd566ea | 538 | goto err1; |
c06b540a TT |
539 | } |
540 | inline_bytes -= ret; | |
541 | ||
34d16e42 | 542 | ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec, |
c06b540a | 543 | inline_bytes); |
34d16e42 | 544 | svc_rdma_put_req_map(vec); |
c06b540a TT |
545 | dprintk("svcrdma: send_reply returns %d\n", ret); |
546 | return ret; | |
afd566ea TT |
547 | |
548 | err1: | |
549 | put_page(res_page); | |
550 | err0: | |
34d16e42 | 551 | svc_rdma_put_req_map(vec); |
c06b540a | 552 | svc_rdma_put_context(ctxt, 0); |
c06b540a TT |
553 | return ret; |
554 | } |