svc_rdma_sendto.c 15.9 KB
Newer Older
T
Tom Tucker 已提交
1
/*
S
Steve Wise 已提交
2
 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
T
Tom Tucker 已提交
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the BSD-type
 * license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *      Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *      Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 *      Neither the name of the Network Appliance, Inc. nor the names of
 *      its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written
 *      permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Tom Tucker <tom@opengridcomputing.com>
 */

#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <linux/sunrpc/svc_rdma.h>

#define RPCDBG_FACILITY	RPCDBG_SVCXPRT

53 54 55
static int map_xdr(struct svcxprt_rdma *xprt,
		   struct xdr_buf *xdr,
		   struct svc_rdma_req_map *vec)
T
Tom Tucker 已提交
56 57 58 59
{
	int sge_no;
	u32 sge_bytes;
	u32 page_bytes;
60
	u32 page_off;
T
Tom Tucker 已提交
61 62
	int page_no;

63 64 65 66 67
	if (xdr->len !=
	    (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len)) {
		pr_err("svcrdma: map_xdr: XDR buffer length error\n");
		return -EIO;
	}
68

T
Tom Tucker 已提交
69 70 71 72
	/* Skip the first sge, this is for the RPCRDMA header */
	sge_no = 1;

	/* Head SGE */
73 74
	vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
	vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
T
Tom Tucker 已提交
75 76 77 78 79 80
	sge_no++;

	/* pages SGE */
	page_no = 0;
	page_bytes = xdr->page_len;
	page_off = xdr->page_base;
81 82 83 84
	while (page_bytes) {
		vec->sge[sge_no].iov_base =
			page_address(xdr->pages[page_no]) + page_off;
		sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
T
Tom Tucker 已提交
85
		page_bytes -= sge_bytes;
86
		vec->sge[sge_no].iov_len = sge_bytes;
T
Tom Tucker 已提交
87 88 89 90 91 92 93

		sge_no++;
		page_no++;
		page_off = 0; /* reset for next time through loop */
	}

	/* Tail SGE */
94 95 96
	if (xdr->tail[0].iov_len) {
		vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
		vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
T
Tom Tucker 已提交
97 98 99
		sge_no++;
	}

100
	dprintk("svcrdma: map_xdr: sge_no %d page_no %d "
101
		"page_base %u page_len %u head_len %zu tail_len %zu\n",
102 103 104
		sge_no, page_no, xdr->page_base, xdr->page_len,
		xdr->head[0].iov_len, xdr->tail[0].iov_len);

105
	vec->count = sge_no;
106
	return 0;
T
Tom Tucker 已提交
107 108
}

109 110 111 112 113 114 115 116 117 118 119 120 121 122
static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
			      struct xdr_buf *xdr,
			      u32 xdr_off, size_t len, int dir)
{
	struct page *page;
	dma_addr_t dma_addr;
	if (xdr_off < xdr->head[0].iov_len) {
		/* This offset is in the head */
		xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
		page = virt_to_page(xdr->head[0].iov_base);
	} else {
		xdr_off -= xdr->head[0].iov_len;
		if (xdr_off < xdr->page_len) {
			/* This offset is in the page list */
123
			xdr_off += xdr->page_base;
124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
			page = xdr->pages[xdr_off >> PAGE_SHIFT];
			xdr_off &= ~PAGE_MASK;
		} else {
			/* This offset is in the tail */
			xdr_off -= xdr->page_len;
			xdr_off += (unsigned long)
				xdr->tail[0].iov_base & ~PAGE_MASK;
			page = virt_to_page(xdr->tail[0].iov_base);
		}
	}
	dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off,
				   min_t(size_t, PAGE_SIZE, len), dir);
	return dma_addr;
}

T
Tom Tucker 已提交
139 140 141 142 143 144
/* Assumptions:
 * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
 */
static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
		      u32 rmr, u64 to,
		      u32 xdr_off, int write_len,
145
		      struct svc_rdma_req_map *vec)
T
Tom Tucker 已提交
146 147 148 149 150 151 152 153 154 155
{
	struct ib_send_wr write_wr;
	struct ib_sge *sge;
	int xdr_sge_no;
	int sge_no;
	int sge_bytes;
	int sge_off;
	int bc;
	struct svc_rdma_op_ctxt *ctxt;

156 157 158 159 160
	if (vec->count > RPCSVC_MAXPAGES) {
		pr_err("svcrdma: Too many pages (%lu)\n", vec->count);
		return -EIO;
	}

T
Tom Tucker 已提交
161
	dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
162
		"write_len=%d, vec->sge=%p, vec->count=%lu\n",
163
		rmr, (unsigned long long)to, xdr_off,
164
		write_len, vec->sge, vec->count);
T
Tom Tucker 已提交
165 166

	ctxt = svc_rdma_get_context(xprt);
167 168
	ctxt->direction = DMA_TO_DEVICE;
	sge = ctxt->sge;
T
Tom Tucker 已提交
169 170

	/* Find the SGE associated with xdr_off */
171
	for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
T
Tom Tucker 已提交
172
	     xdr_sge_no++) {
173
		if (vec->sge[xdr_sge_no].iov_len > bc)
T
Tom Tucker 已提交
174
			break;
175
		bc -= vec->sge[xdr_sge_no].iov_len;
T
Tom Tucker 已提交
176 177 178 179 180 181 182
	}

	sge_off = bc;
	bc = write_len;
	sge_no = 0;

	/* Copy the remaining SGE */
183 184 185
	while (bc != 0) {
		sge_bytes = min_t(size_t,
			  bc, vec->sge[xdr_sge_no].iov_len-sge_off);
T
Tom Tucker 已提交
186
		sge[sge_no].length = sge_bytes;
S
Steve Wise 已提交
187 188 189 190 191 192 193 194 195
		sge[sge_no].addr =
			dma_map_xdr(xprt, &rqstp->rq_res, xdr_off,
				    sge_bytes, DMA_TO_DEVICE);
		xdr_off += sge_bytes;
		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
					 sge[sge_no].addr))
			goto err;
		atomic_inc(&xprt->sc_dma_used);
		sge[sge_no].lkey = xprt->sc_dma_lkey;
196
		ctxt->count++;
T
Tom Tucker 已提交
197 198 199
		sge_off = 0;
		sge_no++;
		xdr_sge_no++;
200 201 202 203
		if (xdr_sge_no > vec->count) {
			pr_err("svcrdma: Too many sges (%d)\n", xdr_sge_no);
			goto err;
		}
T
Tom Tucker 已提交
204
		bc -= sge_bytes;
205 206
		if (sge_no == xprt->sc_max_sge)
			break;
T
Tom Tucker 已提交
207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
	}

	/* Prepare WRITE WR */
	memset(&write_wr, 0, sizeof write_wr);
	ctxt->wr_op = IB_WR_RDMA_WRITE;
	write_wr.wr_id = (unsigned long)ctxt;
	write_wr.sg_list = &sge[0];
	write_wr.num_sge = sge_no;
	write_wr.opcode = IB_WR_RDMA_WRITE;
	write_wr.send_flags = IB_SEND_SIGNALED;
	write_wr.wr.rdma.rkey = rmr;
	write_wr.wr.rdma.remote_addr = to;

	/* Post It */
	atomic_inc(&rdma_stat_write);
222 223
	if (svc_rdma_send(xprt, &write_wr))
		goto err;
224
	return write_len - bc;
225
 err:
226
	svc_rdma_unmap_dma(ctxt);
227 228 229
	svc_rdma_put_context(ctxt, 0);
	/* Fatal error, close transport */
	return -EIO;
T
Tom Tucker 已提交
230 231 232 233 234 235
}

static int send_write_chunks(struct svcxprt_rdma *xprt,
			     struct rpcrdma_msg *rdma_argp,
			     struct rpcrdma_msg *rdma_resp,
			     struct svc_rqst *rqstp,
236
			     struct svc_rdma_req_map *vec)
T
Tom Tucker 已提交
237 238 239 240 241 242
{
	u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
	int write_len;
	u32 xdr_off;
	int chunk_off;
	int chunk_no;
243
	int nchunks;
T
Tom Tucker 已提交
244 245 246 247 248 249 250 251 252 253 254
	struct rpcrdma_write_array *arg_ary;
	struct rpcrdma_write_array *res_ary;
	int ret;

	arg_ary = svc_rdma_get_write_array(rdma_argp);
	if (!arg_ary)
		return 0;
	res_ary = (struct rpcrdma_write_array *)
		&rdma_resp->rm_body.rm_chunks[1];

	/* Write chunks start at the pagelist */
255
	nchunks = be32_to_cpu(arg_ary->wc_nchunks);
T
Tom Tucker 已提交
256
	for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
257
	     xfer_len && chunk_no < nchunks;
T
Tom Tucker 已提交
258 259 260 261 262
	     chunk_no++) {
		struct rpcrdma_segment *arg_ch;
		u64 rs_offset;

		arg_ch = &arg_ary->wc_array[chunk_no].wc_target;
263
		write_len = min(xfer_len, be32_to_cpu(arg_ch->rs_length));
T
Tom Tucker 已提交
264 265 266

		/* Prepare the response chunk given the length actually
		 * written */
267
		xdr_decode_hyper((__be32 *)&arg_ch->rs_offset, &rs_offset);
T
Tom Tucker 已提交
268
		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
269 270 271
						arg_ch->rs_handle,
						arg_ch->rs_offset,
						write_len);
T
Tom Tucker 已提交
272 273 274
		chunk_off = 0;
		while (write_len) {
			ret = send_write(xprt, rqstp,
275
					 be32_to_cpu(arg_ch->rs_handle),
T
Tom Tucker 已提交
276 277
					 rs_offset + chunk_off,
					 xdr_off,
278
					 write_len,
279
					 vec);
280
			if (ret <= 0) {
T
Tom Tucker 已提交
281 282 283 284
				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
					ret);
				return -EIO;
			}
285 286 287 288
			chunk_off += ret;
			xdr_off += ret;
			xfer_len -= ret;
			write_len -= ret;
T
Tom Tucker 已提交
289 290 291 292 293 294 295 296 297 298 299 300
		}
	}
	/* Update the req with the number of chunks actually used */
	svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);

	return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
}

static int send_reply_chunks(struct svcxprt_rdma *xprt,
			     struct rpcrdma_msg *rdma_argp,
			     struct rpcrdma_msg *rdma_resp,
			     struct svc_rqst *rqstp,
301
			     struct svc_rdma_req_map *vec)
T
Tom Tucker 已提交
302 303 304 305 306 307
{
	u32 xfer_len = rqstp->rq_res.len;
	int write_len;
	u32 xdr_off;
	int chunk_no;
	int chunk_off;
308
	int nchunks;
T
Tom Tucker 已提交
309 310 311 312 313 314 315 316 317 318 319 320 321 322
	struct rpcrdma_segment *ch;
	struct rpcrdma_write_array *arg_ary;
	struct rpcrdma_write_array *res_ary;
	int ret;

	arg_ary = svc_rdma_get_reply_array(rdma_argp);
	if (!arg_ary)
		return 0;
	/* XXX: need to fix when reply lists occur with read-list and or
	 * write-list */
	res_ary = (struct rpcrdma_write_array *)
		&rdma_resp->rm_body.rm_chunks[2];

	/* xdr offset starts at RPC message */
323
	nchunks = be32_to_cpu(arg_ary->wc_nchunks);
T
Tom Tucker 已提交
324
	for (xdr_off = 0, chunk_no = 0;
325
	     xfer_len && chunk_no < nchunks;
T
Tom Tucker 已提交
326 327 328
	     chunk_no++) {
		u64 rs_offset;
		ch = &arg_ary->wc_array[chunk_no].wc_target;
329
		write_len = min(xfer_len, be32_to_cpu(ch->rs_length));
T
Tom Tucker 已提交
330 331 332

		/* Prepare the reply chunk given the length actually
		 * written */
333
		xdr_decode_hyper((__be32 *)&ch->rs_offset, &rs_offset);
T
Tom Tucker 已提交
334
		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
335 336
						ch->rs_handle, ch->rs_offset,
						write_len);
T
Tom Tucker 已提交
337 338 339
		chunk_off = 0;
		while (write_len) {
			ret = send_write(xprt, rqstp,
340
					 be32_to_cpu(ch->rs_handle),
T
Tom Tucker 已提交
341 342
					 rs_offset + chunk_off,
					 xdr_off,
343
					 write_len,
344
					 vec);
345
			if (ret <= 0) {
T
Tom Tucker 已提交
346 347 348 349
				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
					ret);
				return -EIO;
			}
350 351 352 353
			chunk_off += ret;
			xdr_off += ret;
			xfer_len -= ret;
			write_len -= ret;
T
Tom Tucker 已提交
354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
		}
	}
	/* Update the req with the number of chunks actually used */
	svc_rdma_xdr_encode_reply_array(res_ary, chunk_no);

	return rqstp->rq_res.len;
}

/* This function prepares the portion of the RPCRDMA message to be
 * sent in the RDMA_SEND. This function is called after data sent via
 * RDMA has already been transmitted. There are three cases:
 * - The RPCRDMA header, RPC header, and payload are all sent in a
 *   single RDMA_SEND. This is the "inline" case.
 * - The RPCRDMA header and some portion of the RPC header and data
 *   are sent via this RDMA_SEND and another portion of the data is
 *   sent via RDMA.
 * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
 *   header and data are all transmitted via RDMA.
 * In all three cases, this function prepares the RPCRDMA header in
 * sge[0], the 'type' parameter indicates the type to place in the
 * RPCRDMA header, and the 'byte_count' field indicates how much of
375 376
 * the XDR to include in this RDMA_SEND. NB: The offset of the payload
 * to send is zero in the XDR.
T
Tom Tucker 已提交
377 378 379 380 381 382
 */
static int send_reply(struct svcxprt_rdma *rdma,
		      struct svc_rqst *rqstp,
		      struct page *page,
		      struct rpcrdma_msg *rdma_resp,
		      struct svc_rdma_op_ctxt *ctxt,
383
		      struct svc_rdma_req_map *vec,
T
Tom Tucker 已提交
384 385 386 387 388 389
		      int byte_count)
{
	struct ib_send_wr send_wr;
	int sge_no;
	int sge_bytes;
	int page_no;
390
	int pages;
T
Tom Tucker 已提交
391 392
	int ret;

393 394 395 396 397 398 399
	/* Post a recv buffer to handle another request. */
	ret = svc_rdma_post_recv(rdma);
	if (ret) {
		printk(KERN_INFO
		       "svcrdma: could not post a receive buffer, err=%d."
		       "Closing transport %p.\n", ret, rdma);
		set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
400 401
		svc_rdma_put_context(ctxt, 0);
		return -ENOTCONN;
402 403
	}

T
Tom Tucker 已提交
404 405 406 407 408
	/* Prepare the context */
	ctxt->pages[0] = page;
	ctxt->count = 1;

	/* Prepare the SGE for the RPCRDMA Header */
409 410
	ctxt->sge[0].lkey = rdma->sc_dma_lkey;
	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
T
Tom Tucker 已提交
411
	ctxt->sge[0].addr =
412 413
	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
			    ctxt->sge[0].length, DMA_TO_DEVICE);
414 415 416 417
	if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
		goto err;
	atomic_inc(&rdma->sc_dma_used);

T
Tom Tucker 已提交
418
	ctxt->direction = DMA_TO_DEVICE;
419

420
	/* Map the payload indicated by 'byte_count' */
421
	for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
422
		int xdr_off = 0;
423
		sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
T
Tom Tucker 已提交
424
		byte_count -= sge_bytes;
S
Steve Wise 已提交
425 426 427 428 429 430 431 432 433
		ctxt->sge[sge_no].addr =
			dma_map_xdr(rdma, &rqstp->rq_res, xdr_off,
				    sge_bytes, DMA_TO_DEVICE);
		xdr_off += sge_bytes;
		if (ib_dma_mapping_error(rdma->sc_cm_id->device,
					 ctxt->sge[sge_no].addr))
			goto err;
		atomic_inc(&rdma->sc_dma_used);
		ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
434
		ctxt->sge[sge_no].length = sge_bytes;
T
Tom Tucker 已提交
435
	}
436 437 438 439
	if (byte_count != 0) {
		pr_err("svcrdma: Could not map %d bytes\n", byte_count);
		goto err;
	}
T
Tom Tucker 已提交
440 441 442 443 444

	/* Save all respages in the ctxt and remove them from the
	 * respages array. They are our pages until the I/O
	 * completes.
	 */
445 446
	pages = rqstp->rq_next_page - rqstp->rq_respages;
	for (page_no = 0; page_no < pages; page_no++) {
T
Tom Tucker 已提交
447 448 449
		ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
		ctxt->count++;
		rqstp->rq_respages[page_no] = NULL;
450 451 452 453 454
		/*
		 * If there are more pages than SGE, terminate SGE
		 * list so that svc_rdma_unmap_dma doesn't attempt to
		 * unmap garbage.
		 */
455 456
		if (page_no+1 >= sge_no)
			ctxt->sge[page_no+1].length = 0;
T
Tom Tucker 已提交
457
	}
T
Tom Tucker 已提交
458
	rqstp->rq_next_page = rqstp->rq_respages + 1;
S
Steve Wise 已提交
459

460 461 462 463
	if (sge_no > rdma->sc_max_sge) {
		pr_err("svcrdma: Too many sges (%d)\n", sge_no);
		goto err;
	}
T
Tom Tucker 已提交
464 465 466 467 468 469 470 471 472 473
	memset(&send_wr, 0, sizeof send_wr);
	ctxt->wr_op = IB_WR_SEND;
	send_wr.wr_id = (unsigned long)ctxt;
	send_wr.sg_list = ctxt->sge;
	send_wr.num_sge = sge_no;
	send_wr.opcode = IB_WR_SEND;
	send_wr.send_flags =  IB_SEND_SIGNALED;

	ret = svc_rdma_send(rdma, &send_wr);
	if (ret)
474
		goto err;
T
Tom Tucker 已提交
475

476 477 478
	return 0;

 err:
S
Steve Wise 已提交
479
	svc_rdma_unmap_dma(ctxt);
480 481
	svc_rdma_put_context(ctxt, 1);
	return -EIO;
T
Tom Tucker 已提交
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
}

void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
{
}

int svc_rdma_sendto(struct svc_rqst *rqstp)
{
	struct svc_xprt *xprt = rqstp->rq_xprt;
	struct svcxprt_rdma *rdma =
		container_of(xprt, struct svcxprt_rdma, sc_xprt);
	struct rpcrdma_msg *rdma_argp;
	struct rpcrdma_msg *rdma_resp;
	struct rpcrdma_write_array *reply_ary;
	enum rpcrdma_proc reply_type;
	int ret;
	int inline_bytes;
	struct page *res_page;
	struct svc_rdma_op_ctxt *ctxt;
501
	struct svc_rdma_req_map *vec;
T
Tom Tucker 已提交
502 503 504

	dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);

C
Chuck Lever 已提交
505 506 507 508
	/* Get the RDMA request header. The receive logic always
	 * places this at the start of page 0.
	 */
	rdma_argp = page_address(rqstp->rq_pages[0]);
T
Tom Tucker 已提交
509

510
	/* Build an req vec for the XDR */
T
Tom Tucker 已提交
511 512
	ctxt = svc_rdma_get_context(rdma);
	ctxt->direction = DMA_TO_DEVICE;
513
	vec = svc_rdma_get_req_map();
514 515 516
	ret = map_xdr(rdma, &rqstp->rq_res, vec);
	if (ret)
		goto err0;
T
Tom Tucker 已提交
517 518 519
	inline_bytes = rqstp->rq_res.len;

	/* Create the RDMA response header */
520
	res_page = alloc_page(GFP_KERNEL | __GFP_NOFAIL);
T
Tom Tucker 已提交
521 522 523 524 525 526 527 528 529 530 531
	rdma_resp = page_address(res_page);
	reply_ary = svc_rdma_get_reply_array(rdma_argp);
	if (reply_ary)
		reply_type = RDMA_NOMSG;
	else
		reply_type = RDMA_MSG;
	svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
					 rdma_resp, reply_type);

	/* Send any write-chunk data and build resp write-list */
	ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
532
				rqstp, vec);
T
Tom Tucker 已提交
533 534 535
	if (ret < 0) {
		printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
		       ret);
536
		goto err1;
T
Tom Tucker 已提交
537 538 539 540 541
	}
	inline_bytes -= ret;

	/* Send any reply-list data and update resp reply-list */
	ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
542
				rqstp, vec);
T
Tom Tucker 已提交
543 544 545
	if (ret < 0) {
		printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
		       ret);
546
		goto err1;
T
Tom Tucker 已提交
547 548 549
	}
	inline_bytes -= ret;

550
	ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec,
T
Tom Tucker 已提交
551
			 inline_bytes);
552
	svc_rdma_put_req_map(vec);
T
Tom Tucker 已提交
553 554
	dprintk("svcrdma: send_reply returns %d\n", ret);
	return ret;
555 556 557 558

 err1:
	put_page(res_page);
 err0:
559
	svc_rdma_put_req_map(vec);
T
Tom Tucker 已提交
560 561 562
	svc_rdma_put_context(ctxt, 0);
	return ret;
}