blob: d7310109b6014b110e5fec626f799b4bb44ba104 [file] [log] [blame]
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -04001/*
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -04002 * Copyright (c) 2003-2007 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
40/*
41 * rpc_rdma.c
42 *
43 * This file contains the guts of the RPC RDMA protocol, and
44 * does marshaling/unmarshaling, etc. It is also where interfacing
45 * to the Linux RPC framework lives.
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -040046 */
47
48#include "xprt_rdma.h"
49
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040050#include <linux/highmem.h>
51
Jeff Laytonf895b252014-11-17 16:58:04 -050052#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040053# define RPCDBG_FACILITY RPCDBG_TRANS
54#endif
55
Jeff Laytonf895b252014-11-17 16:58:04 -050056#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040057static const char transfertypes[][12] = {
58 "pure inline", /* no chunks */
59 " read chunk", /* some argument via rdma read */
60 "*read chunk", /* entire request via rdma read */
61 "write chunk", /* some result via rdma write */
62 "reply chunk" /* entire reply via rdma write */
63};
64#endif
65
66/*
67 * Chunk assembly from upper layer xdr_buf.
68 *
69 * Prepare the passed-in xdr_buf into representation as RPC/RDMA chunk
70 * elements. Segments are then coalesced when registered, if possible
71 * within the selected memreg mode.
Chuck Leverc93c6222014-05-28 10:35:14 -040072 *
73 * Returns positive number of segments converted, or a negative errno.
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040074 */
75
76static int
Chuck Lever2a428b22007-10-26 13:30:43 -040077rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040078 enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg, int nsegs)
79{
80 int len, n = 0, p;
Tom Tuckerbd7ea312011-02-09 19:45:28 +000081 int page_base;
82 struct page **ppages;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040083
84 if (pos == 0 && xdrbuf->head[0].iov_len) {
85 seg[n].mr_page = NULL;
86 seg[n].mr_offset = xdrbuf->head[0].iov_base;
87 seg[n].mr_len = xdrbuf->head[0].iov_len;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -040088 ++n;
89 }
90
Tom Tuckerbd7ea312011-02-09 19:45:28 +000091 len = xdrbuf->page_len;
92 ppages = xdrbuf->pages + (xdrbuf->page_base >> PAGE_SHIFT);
93 page_base = xdrbuf->page_base & ~PAGE_MASK;
94 p = 0;
95 while (len && n < nsegs) {
Shirley Ma196c6992014-05-28 10:34:24 -040096 if (!ppages[p]) {
97 /* alloc the pagelist for receiving buffer */
98 ppages[p] = alloc_page(GFP_ATOMIC);
99 if (!ppages[p])
Chuck Leverc93c6222014-05-28 10:35:14 -0400100 return -ENOMEM;
Shirley Ma196c6992014-05-28 10:34:24 -0400101 }
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000102 seg[n].mr_page = ppages[p];
103 seg[n].mr_offset = (void *)(unsigned long) page_base;
104 seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);
Chuck Leverc93c6222014-05-28 10:35:14 -0400105 if (seg[n].mr_len > PAGE_SIZE)
106 return -EIO;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000107 len -= seg[n].mr_len;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400108 ++n;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000109 ++p;
110 page_base = 0; /* page offset only applies to first page */
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400111 }
112
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000113 /* Message overflows the seg array */
114 if (len && n == nsegs)
Chuck Leverc93c6222014-05-28 10:35:14 -0400115 return -EIO;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000116
James Lentini50e10922007-12-10 11:24:48 -0500117 if (xdrbuf->tail[0].iov_len) {
Tom Talpey9191ca32008-10-09 15:01:11 -0400118 /* the rpcrdma protocol allows us to omit any trailing
119 * xdr pad bytes, saving the server an RDMA operation. */
120 if (xdrbuf->tail[0].iov_len < 4 && xprt_rdma_pad_optimize)
121 return n;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400122 if (n == nsegs)
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000123 /* Tail remains, but we're out of segments */
Chuck Leverc93c6222014-05-28 10:35:14 -0400124 return -EIO;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400125 seg[n].mr_page = NULL;
126 seg[n].mr_offset = xdrbuf->tail[0].iov_base;
127 seg[n].mr_len = xdrbuf->tail[0].iov_len;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400128 ++n;
129 }
130
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400131 return n;
132}
133
134/*
135 * Create read/write chunk lists, and reply chunks, for RDMA
136 *
137 * Assume check against THRESHOLD has been done, and chunks are required.
138 * Assume only encoding one list entry for read|write chunks. The NFSv3
139 * protocol is simple enough to allow this as it only has a single "bulk
140 * result" in each procedure - complicated NFSv4 COMPOUNDs are not. (The
141 * RDMA/Sessions NFSv4 proposal addresses this for future v4 revs.)
142 *
143 * When used for a single reply chunk (which is a special write
144 * chunk used for the entire reply, rather than just the data), it
145 * is used primarily for READDIR and READLINK which would otherwise
146 * be severely size-limited by a small rdma inline read max. The server
147 * response will come back as an RDMA Write, followed by a message
148 * of type RDMA_NOMSG carrying the xid and length. As a result, reply
149 * chunks do not provide data alignment, however they do not require
150 * "fixup" (moving the response to the upper layer buffer) either.
151 *
152 * Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
153 *
154 * Read chunklist (a linked list):
155 * N elements, position P (same P for all chunks of same arg!):
156 * 1 - PHLOO - 1 - PHLOO - ... - 1 - PHLOO - 0
157 *
158 * Write chunklist (a list of (one) counted array):
159 * N elements:
160 * 1 - N - HLOO - HLOO - ... - HLOO - 0
161 *
162 * Reply chunk (a counted array):
163 * N elements:
164 * 1 - N - HLOO - HLOO - ... - HLOO
Chuck Leverc93c6222014-05-28 10:35:14 -0400165 *
166 * Returns positive RPC/RDMA header size, or negative errno.
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400167 */
168
Chuck Leverc93c6222014-05-28 10:35:14 -0400169static ssize_t
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400170rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
171 struct rpcrdma_msg *headerp, enum rpcrdma_chunktype type)
172{
173 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
Trond Myklebusta4f08352013-01-08 09:10:21 -0500174 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
Chuck Leverc93c6222014-05-28 10:35:14 -0400175 int n, nsegs, nchunks = 0;
Chuck Lever2a428b22007-10-26 13:30:43 -0400176 unsigned int pos;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400177 struct rpcrdma_mr_seg *seg = req->rl_segments;
178 struct rpcrdma_read_chunk *cur_rchunk = NULL;
179 struct rpcrdma_write_array *warray = NULL;
180 struct rpcrdma_write_chunk *cur_wchunk = NULL;
Al Viro2d8a9722007-10-29 04:37:58 +0000181 __be32 *iptr = headerp->rm_body.rm_chunks;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400182
183 if (type == rpcrdma_readch || type == rpcrdma_areadch) {
184 /* a read chunk - server will RDMA Read our memory */
185 cur_rchunk = (struct rpcrdma_read_chunk *) iptr;
186 } else {
187 /* a write or reply chunk - server will RDMA Write our memory */
188 *iptr++ = xdr_zero; /* encode a NULL read chunk list */
189 if (type == rpcrdma_replych)
190 *iptr++ = xdr_zero; /* a NULL write chunk list */
191 warray = (struct rpcrdma_write_array *) iptr;
192 cur_wchunk = (struct rpcrdma_write_chunk *) (warray + 1);
193 }
194
195 if (type == rpcrdma_replych || type == rpcrdma_areadch)
196 pos = 0;
197 else
198 pos = target->head[0].iov_len;
199
200 nsegs = rpcrdma_convert_iovs(target, pos, type, seg, RPCRDMA_MAX_SEGS);
Chuck Leverc93c6222014-05-28 10:35:14 -0400201 if (nsegs < 0)
202 return nsegs;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400203
204 do {
Chuck Leverc93c6222014-05-28 10:35:14 -0400205 n = rpcrdma_register_external(seg, nsegs,
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400206 cur_wchunk != NULL, r_xprt);
207 if (n <= 0)
208 goto out;
209 if (cur_rchunk) { /* read */
210 cur_rchunk->rc_discrim = xdr_one;
211 /* all read chunks have the same "position" */
Chuck Lever284f4902015-01-21 11:02:13 -0500212 cur_rchunk->rc_position = cpu_to_be32(pos);
213 cur_rchunk->rc_target.rs_handle =
214 cpu_to_be32(seg->mr_rkey);
215 cur_rchunk->rc_target.rs_length =
216 cpu_to_be32(seg->mr_len);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400217 xdr_encode_hyper(
Al Viro2d8a9722007-10-29 04:37:58 +0000218 (__be32 *)&cur_rchunk->rc_target.rs_offset,
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400219 seg->mr_base);
220 dprintk("RPC: %s: read chunk "
Chuck Lever2a428b22007-10-26 13:30:43 -0400221 "elem %d@0x%llx:0x%x pos %u (%s)\n", __func__,
Stephen Rothwelle08a1322007-10-30 00:44:32 -0700222 seg->mr_len, (unsigned long long)seg->mr_base,
223 seg->mr_rkey, pos, n < nsegs ? "more" : "last");
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400224 cur_rchunk++;
225 r_xprt->rx_stats.read_chunk_count++;
226 } else { /* write/reply */
Chuck Lever284f4902015-01-21 11:02:13 -0500227 cur_wchunk->wc_target.rs_handle =
228 cpu_to_be32(seg->mr_rkey);
229 cur_wchunk->wc_target.rs_length =
230 cpu_to_be32(seg->mr_len);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400231 xdr_encode_hyper(
Al Viro2d8a9722007-10-29 04:37:58 +0000232 (__be32 *)&cur_wchunk->wc_target.rs_offset,
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400233 seg->mr_base);
234 dprintk("RPC: %s: %s chunk "
235 "elem %d@0x%llx:0x%x (%s)\n", __func__,
236 (type == rpcrdma_replych) ? "reply" : "write",
Stephen Rothwelle08a1322007-10-30 00:44:32 -0700237 seg->mr_len, (unsigned long long)seg->mr_base,
238 seg->mr_rkey, n < nsegs ? "more" : "last");
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400239 cur_wchunk++;
240 if (type == rpcrdma_replych)
241 r_xprt->rx_stats.reply_chunk_count++;
242 else
243 r_xprt->rx_stats.write_chunk_count++;
244 r_xprt->rx_stats.total_rdma_request += seg->mr_len;
245 }
246 nchunks++;
247 seg += n;
248 nsegs -= n;
249 } while (nsegs);
250
251 /* success. all failures return above */
252 req->rl_nchunks = nchunks;
253
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400254 /*
255 * finish off header. If write, marshal discrim and nchunks.
256 */
257 if (cur_rchunk) {
Al Viro2d8a9722007-10-29 04:37:58 +0000258 iptr = (__be32 *) cur_rchunk;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400259 *iptr++ = xdr_zero; /* finish the read chunk list */
260 *iptr++ = xdr_zero; /* encode a NULL write chunk list */
261 *iptr++ = xdr_zero; /* encode a NULL reply chunk */
262 } else {
263 warray->wc_discrim = xdr_one;
Chuck Lever284f4902015-01-21 11:02:13 -0500264 warray->wc_nchunks = cpu_to_be32(nchunks);
Al Viro2d8a9722007-10-29 04:37:58 +0000265 iptr = (__be32 *) cur_wchunk;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400266 if (type == rpcrdma_writech) {
267 *iptr++ = xdr_zero; /* finish the write chunk list */
268 *iptr++ = xdr_zero; /* encode a NULL reply chunk */
269 }
270 }
271
272 /*
273 * Return header size.
274 */
275 return (unsigned char *)iptr - (unsigned char *)headerp;
276
277out:
Chuck Lever539431a2014-07-29 17:24:01 -0400278 if (r_xprt->rx_ia.ri_memreg_strategy != RPCRDMA_FRMR) {
279 for (pos = 0; nchunks--;)
280 pos += rpcrdma_deregister_external(
281 &req->rl_segments[pos], r_xprt);
282 }
Chuck Leverc93c6222014-05-28 10:35:14 -0400283 return n;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400284}
285
286/*
Chuck Lever6ab59942014-07-29 17:23:43 -0400287 * Marshal chunks. This routine returns the header length
288 * consumed by marshaling.
289 *
290 * Returns positive RPC/RDMA header size, or negative errno.
291 */
292
293ssize_t
294rpcrdma_marshal_chunks(struct rpc_rqst *rqst, ssize_t result)
295{
296 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
297 struct rpcrdma_msg *headerp = (struct rpcrdma_msg *)req->rl_base;
298
299 if (req->rl_rtype != rpcrdma_noch)
300 result = rpcrdma_create_chunks(rqst, &rqst->rq_snd_buf,
301 headerp, req->rl_rtype);
302 else if (req->rl_wtype != rpcrdma_noch)
303 result = rpcrdma_create_chunks(rqst, &rqst->rq_rcv_buf,
304 headerp, req->rl_wtype);
305 return result;
306}
307
308/*
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400309 * Copy write data inline.
310 * This function is used for "small" requests. Data which is passed
311 * to RPC via iovecs (or page list) is copied directly into the
312 * pre-registered memory buffer for this request. For small amounts
313 * of data, this is efficient. The cutoff value is tunable.
314 */
315static int
316rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
317{
318 int i, npages, curlen;
319 int copy_len;
320 unsigned char *srcp, *destp;
321 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000322 int page_base;
323 struct page **ppages;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400324
325 destp = rqst->rq_svec[0].iov_base;
326 curlen = rqst->rq_svec[0].iov_len;
327 destp += curlen;
328 /*
329 * Do optional padding where it makes sense. Alignment of write
330 * payload can help the server, if our setting is accurate.
331 */
332 pad -= (curlen + 36/*sizeof(struct rpcrdma_msg_padded)*/);
333 if (pad < 0 || rqst->rq_slen - curlen < RPCRDMA_INLINE_PAD_THRESH)
334 pad = 0; /* don't pad this request */
335
336 dprintk("RPC: %s: pad %d destp 0x%p len %d hdrlen %d\n",
337 __func__, pad, destp, rqst->rq_slen, curlen);
338
339 copy_len = rqst->rq_snd_buf.page_len;
Tom Talpeyb38ab402009-03-11 14:37:55 -0400340
341 if (rqst->rq_snd_buf.tail[0].iov_len) {
342 curlen = rqst->rq_snd_buf.tail[0].iov_len;
343 if (destp + copy_len != rqst->rq_snd_buf.tail[0].iov_base) {
344 memmove(destp + copy_len,
345 rqst->rq_snd_buf.tail[0].iov_base, curlen);
346 r_xprt->rx_stats.pullup_copy_count += curlen;
347 }
348 dprintk("RPC: %s: tail destp 0x%p len %d\n",
349 __func__, destp + copy_len, curlen);
350 rqst->rq_svec[0].iov_len += curlen;
351 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400352 r_xprt->rx_stats.pullup_copy_count += copy_len;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000353
354 page_base = rqst->rq_snd_buf.page_base;
355 ppages = rqst->rq_snd_buf.pages + (page_base >> PAGE_SHIFT);
356 page_base &= ~PAGE_MASK;
357 npages = PAGE_ALIGN(page_base+copy_len) >> PAGE_SHIFT;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400358 for (i = 0; copy_len && i < npages; i++) {
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000359 curlen = PAGE_SIZE - page_base;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400360 if (curlen > copy_len)
361 curlen = copy_len;
362 dprintk("RPC: %s: page %d destp 0x%p len %d curlen %d\n",
363 __func__, i, destp, copy_len, curlen);
Cong Wangb8541782011-11-25 23:14:40 +0800364 srcp = kmap_atomic(ppages[i]);
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000365 memcpy(destp, srcp+page_base, curlen);
Cong Wangb8541782011-11-25 23:14:40 +0800366 kunmap_atomic(srcp);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400367 rqst->rq_svec[0].iov_len += curlen;
368 destp += curlen;
369 copy_len -= curlen;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000370 page_base = 0;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400371 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400372 /* header now contains entire send message */
373 return pad;
374}
375
376/*
377 * Marshal a request: the primary job of this routine is to choose
378 * the transfer modes. See comments below.
379 *
380 * Uses multiple RDMA IOVs for a request:
381 * [0] -- RPC RDMA header, which uses memory from the *start* of the
382 * preregistered buffer that already holds the RPC data in
383 * its middle.
384 * [1] -- the RPC header/data, marshaled by RPC and the NFS protocol.
385 * [2] -- optional padding.
386 * [3] -- if padded, header only in [1] and data here.
Chuck Leverc93c6222014-05-28 10:35:14 -0400387 *
388 * Returns zero on success, otherwise a negative errno.
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400389 */
390
391int
392rpcrdma_marshal_req(struct rpc_rqst *rqst)
393{
Trond Myklebusta4f08352013-01-08 09:10:21 -0500394 struct rpc_xprt *xprt = rqst->rq_xprt;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400395 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
396 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
397 char *base;
Chuck Leverc93c6222014-05-28 10:35:14 -0400398 size_t rpclen, padlen;
399 ssize_t hdrlen;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400400 struct rpcrdma_msg *headerp;
401
402 /*
403 * rpclen gets amount of data in first buffer, which is the
404 * pre-registered buffer.
405 */
406 base = rqst->rq_svec[0].iov_base;
407 rpclen = rqst->rq_svec[0].iov_len;
408
409 /* build RDMA header in private area at front */
410 headerp = (struct rpcrdma_msg *) req->rl_base;
Chuck Lever284f4902015-01-21 11:02:13 -0500411 /* don't byte-swap XID, it's already done in request */
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400412 headerp->rm_xid = rqst->rq_xid;
Chuck Lever284f4902015-01-21 11:02:13 -0500413 headerp->rm_vers = rpcrdma_version;
414 headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_max_requests);
415 headerp->rm_type = rdma_msg;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400416
417 /*
418 * Chunks needed for results?
419 *
420 * o If the expected result is under the inline threshold, all ops
421 * return as inline (but see later).
422 * o Large non-read ops return as a single reply chunk.
423 * o Large read ops return data as write chunk(s), header as inline.
424 *
425 * Note: the NFS code sending down multiple result segments implies
426 * the op is one of read, readdir[plus], readlink or NFSv4 getacl.
427 */
428
429 /*
430 * This code can handle read chunks, write chunks OR reply
431 * chunks -- only one type. If the request is too big to fit
432 * inline, then we will choose read chunks. If the request is
433 * a READ, then use write chunks to separate the file data
434 * into pages; otherwise use reply chunks.
435 */
436 if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst))
Chuck Lever6ab59942014-07-29 17:23:43 -0400437 req->rl_wtype = rpcrdma_noch;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400438 else if (rqst->rq_rcv_buf.page_len == 0)
Chuck Lever6ab59942014-07-29 17:23:43 -0400439 req->rl_wtype = rpcrdma_replych;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400440 else if (rqst->rq_rcv_buf.flags & XDRBUF_READ)
Chuck Lever6ab59942014-07-29 17:23:43 -0400441 req->rl_wtype = rpcrdma_writech;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400442 else
Chuck Lever6ab59942014-07-29 17:23:43 -0400443 req->rl_wtype = rpcrdma_replych;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400444
445 /*
446 * Chunks needed for arguments?
447 *
448 * o If the total request is under the inline threshold, all ops
449 * are sent as inline.
450 * o Large non-write ops are sent with the entire message as a
451 * single read chunk (protocol 0-position special case).
452 * o Large write ops transmit data as read chunk(s), header as
453 * inline.
454 *
455 * Note: the NFS code sending down multiple argument segments
456 * implies the op is a write.
457 * TBD check NFSv4 setacl
458 */
459 if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst))
Chuck Lever6ab59942014-07-29 17:23:43 -0400460 req->rl_rtype = rpcrdma_noch;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400461 else if (rqst->rq_snd_buf.page_len == 0)
Chuck Lever6ab59942014-07-29 17:23:43 -0400462 req->rl_rtype = rpcrdma_areadch;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400463 else
Chuck Lever6ab59942014-07-29 17:23:43 -0400464 req->rl_rtype = rpcrdma_readch;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400465
466 /* The following simplification is not true forever */
Chuck Lever6ab59942014-07-29 17:23:43 -0400467 if (req->rl_rtype != rpcrdma_noch && req->rl_wtype == rpcrdma_replych)
468 req->rl_wtype = rpcrdma_noch;
469 if (req->rl_rtype != rpcrdma_noch && req->rl_wtype != rpcrdma_noch) {
Chuck Leverc93c6222014-05-28 10:35:14 -0400470 dprintk("RPC: %s: cannot marshal multiple chunk lists\n",
471 __func__);
472 return -EIO;
473 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400474
Chuck Leverf2846482015-01-21 11:02:29 -0500475 hdrlen = RPCRDMA_HDRLEN_MIN;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400476 padlen = 0;
477
478 /*
479 * Pull up any extra send data into the preregistered buffer.
480 * When padding is in use and applies to the transfer, insert
481 * it and change the message type.
482 */
Chuck Lever6ab59942014-07-29 17:23:43 -0400483 if (req->rl_rtype == rpcrdma_noch) {
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400484
485 padlen = rpcrdma_inline_pullup(rqst,
486 RPCRDMA_INLINE_PAD_VALUE(rqst));
487
488 if (padlen) {
Chuck Lever284f4902015-01-21 11:02:13 -0500489 headerp->rm_type = rdma_msgp;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400490 headerp->rm_body.rm_padded.rm_align =
Chuck Lever284f4902015-01-21 11:02:13 -0500491 cpu_to_be32(RPCRDMA_INLINE_PAD_VALUE(rqst));
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400492 headerp->rm_body.rm_padded.rm_thresh =
Chuck Lever284f4902015-01-21 11:02:13 -0500493 cpu_to_be32(RPCRDMA_INLINE_PAD_THRESH);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400494 headerp->rm_body.rm_padded.rm_pempty[0] = xdr_zero;
495 headerp->rm_body.rm_padded.rm_pempty[1] = xdr_zero;
496 headerp->rm_body.rm_padded.rm_pempty[2] = xdr_zero;
497 hdrlen += 2 * sizeof(u32); /* extra words in padhdr */
Chuck Lever6ab59942014-07-29 17:23:43 -0400498 if (req->rl_wtype != rpcrdma_noch) {
Chuck Leverc93c6222014-05-28 10:35:14 -0400499 dprintk("RPC: %s: invalid chunk list\n",
500 __func__);
501 return -EIO;
502 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400503 } else {
504 headerp->rm_body.rm_nochunks.rm_empty[0] = xdr_zero;
505 headerp->rm_body.rm_nochunks.rm_empty[1] = xdr_zero;
506 headerp->rm_body.rm_nochunks.rm_empty[2] = xdr_zero;
507 /* new length after pullup */
508 rpclen = rqst->rq_svec[0].iov_len;
509 /*
510 * Currently we try to not actually use read inline.
511 * Reply chunks have the desirable property that
512 * they land, packed, directly in the target buffers
513 * without headers, so they require no fixup. The
514 * additional RDMA Write op sends the same amount
515 * of data, streams on-the-wire and adds no overhead
516 * on receive. Therefore, we request a reply chunk
517 * for non-writes wherever feasible and efficient.
518 */
Chuck Lever6ab59942014-07-29 17:23:43 -0400519 if (req->rl_wtype == rpcrdma_noch)
520 req->rl_wtype = rpcrdma_replych;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400521 }
522 }
523
Chuck Lever6ab59942014-07-29 17:23:43 -0400524 hdrlen = rpcrdma_marshal_chunks(rqst, hdrlen);
Chuck Leverc93c6222014-05-28 10:35:14 -0400525 if (hdrlen < 0)
526 return hdrlen;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400527
Tom Talpey5f37d562008-10-09 15:01:52 -0400528 dprintk("RPC: %s: %s: hdrlen %zd rpclen %zd padlen %zd"
529 " headerp 0x%p base 0x%p lkey 0x%x\n",
Chuck Lever6ab59942014-07-29 17:23:43 -0400530 __func__, transfertypes[req->rl_wtype], hdrlen, rpclen, padlen,
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400531 headerp, base, req->rl_iov.lkey);
532
533 /*
534 * initialize send_iov's - normally only two: rdma chunk header and
535 * single preregistered RPC header buffer, but if padding is present,
536 * then use a preregistered (and zeroed) pad buffer between the RPC
537 * header and any write data. In all non-rdma cases, any following
538 * data has been copied into the RPC header buffer.
539 */
540 req->rl_send_iov[0].addr = req->rl_iov.addr;
541 req->rl_send_iov[0].length = hdrlen;
542 req->rl_send_iov[0].lkey = req->rl_iov.lkey;
543
544 req->rl_send_iov[1].addr = req->rl_iov.addr + (base - req->rl_base);
545 req->rl_send_iov[1].length = rpclen;
546 req->rl_send_iov[1].lkey = req->rl_iov.lkey;
547
548 req->rl_niovs = 2;
549
550 if (padlen) {
551 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
552
553 req->rl_send_iov[2].addr = ep->rep_pad.addr;
554 req->rl_send_iov[2].length = padlen;
555 req->rl_send_iov[2].lkey = ep->rep_pad.lkey;
556
557 req->rl_send_iov[3].addr = req->rl_send_iov[1].addr + rpclen;
558 req->rl_send_iov[3].length = rqst->rq_slen - rpclen;
559 req->rl_send_iov[3].lkey = req->rl_iov.lkey;
560
561 req->rl_niovs = 4;
562 }
563
564 return 0;
565}
566
567/*
568 * Chase down a received write or reply chunklist to get length
569 * RDMA'd by server. See map at rpcrdma_create_chunks()! :-)
570 */
571static int
Chuck Leverd4b37ff2007-10-26 13:30:49 -0400572rpcrdma_count_chunks(struct rpcrdma_rep *rep, unsigned int max, int wrchunk, __be32 **iptrp)
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400573{
574 unsigned int i, total_len;
575 struct rpcrdma_write_chunk *cur_wchunk;
576
Chuck Lever284f4902015-01-21 11:02:13 -0500577 i = be32_to_cpu(**iptrp);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400578 if (i > max)
579 return -1;
580 cur_wchunk = (struct rpcrdma_write_chunk *) (*iptrp + 1);
581 total_len = 0;
582 while (i--) {
583 struct rpcrdma_segment *seg = &cur_wchunk->wc_target;
584 ifdebug(FACILITY) {
585 u64 off;
Al Viro2d8a9722007-10-29 04:37:58 +0000586 xdr_decode_hyper((__be32 *)&seg->rs_offset, &off);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400587 dprintk("RPC: %s: chunk %d@0x%llx:0x%x\n",
588 __func__,
Chuck Lever284f4902015-01-21 11:02:13 -0500589 be32_to_cpu(seg->rs_length),
Stephen Rothwelle08a1322007-10-30 00:44:32 -0700590 (unsigned long long)off,
Chuck Lever284f4902015-01-21 11:02:13 -0500591 be32_to_cpu(seg->rs_handle));
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400592 }
Chuck Lever284f4902015-01-21 11:02:13 -0500593 total_len += be32_to_cpu(seg->rs_length);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400594 ++cur_wchunk;
595 }
596 /* check and adjust for properly terminated write chunk */
597 if (wrchunk) {
Al Viro2d8a9722007-10-29 04:37:58 +0000598 __be32 *w = (__be32 *) cur_wchunk;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400599 if (*w++ != xdr_zero)
600 return -1;
601 cur_wchunk = (struct rpcrdma_write_chunk *) w;
602 }
603 if ((char *) cur_wchunk > rep->rr_base + rep->rr_len)
604 return -1;
605
Al Viro2d8a9722007-10-29 04:37:58 +0000606 *iptrp = (__be32 *) cur_wchunk;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400607 return total_len;
608}
609
610/*
611 * Scatter inline received data back into provided iov's.
612 */
613static void
Tom Talpey9191ca32008-10-09 15:01:11 -0400614rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400615{
616 int i, npages, curlen, olen;
617 char *destp;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000618 struct page **ppages;
619 int page_base;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400620
621 curlen = rqst->rq_rcv_buf.head[0].iov_len;
622 if (curlen > copy_len) { /* write chunk header fixup */
623 curlen = copy_len;
624 rqst->rq_rcv_buf.head[0].iov_len = curlen;
625 }
626
627 dprintk("RPC: %s: srcp 0x%p len %d hdrlen %d\n",
628 __func__, srcp, copy_len, curlen);
629
630 /* Shift pointer for first receive segment only */
631 rqst->rq_rcv_buf.head[0].iov_base = srcp;
632 srcp += curlen;
633 copy_len -= curlen;
634
635 olen = copy_len;
636 i = 0;
637 rpcx_to_rdmax(rqst->rq_xprt)->rx_stats.fixup_copy_count += olen;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000638 page_base = rqst->rq_rcv_buf.page_base;
639 ppages = rqst->rq_rcv_buf.pages + (page_base >> PAGE_SHIFT);
640 page_base &= ~PAGE_MASK;
641
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400642 if (copy_len && rqst->rq_rcv_buf.page_len) {
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000643 npages = PAGE_ALIGN(page_base +
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400644 rqst->rq_rcv_buf.page_len) >> PAGE_SHIFT;
645 for (; i < npages; i++) {
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000646 curlen = PAGE_SIZE - page_base;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400647 if (curlen > copy_len)
648 curlen = copy_len;
649 dprintk("RPC: %s: page %d"
650 " srcp 0x%p len %d curlen %d\n",
651 __func__, i, srcp, copy_len, curlen);
Cong Wangb8541782011-11-25 23:14:40 +0800652 destp = kmap_atomic(ppages[i]);
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000653 memcpy(destp + page_base, srcp, curlen);
654 flush_dcache_page(ppages[i]);
Cong Wangb8541782011-11-25 23:14:40 +0800655 kunmap_atomic(destp);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400656 srcp += curlen;
657 copy_len -= curlen;
658 if (copy_len == 0)
659 break;
Tom Tuckerbd7ea312011-02-09 19:45:28 +0000660 page_base = 0;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400661 }
Chuck Lever2b7bbc92014-03-12 12:51:30 -0400662 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400663
664 if (copy_len && rqst->rq_rcv_buf.tail[0].iov_len) {
665 curlen = copy_len;
666 if (curlen > rqst->rq_rcv_buf.tail[0].iov_len)
667 curlen = rqst->rq_rcv_buf.tail[0].iov_len;
668 if (rqst->rq_rcv_buf.tail[0].iov_base != srcp)
Tom Talpeyb38ab402009-03-11 14:37:55 -0400669 memmove(rqst->rq_rcv_buf.tail[0].iov_base, srcp, curlen);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400670 dprintk("RPC: %s: tail srcp 0x%p len %d curlen %d\n",
671 __func__, srcp, copy_len, curlen);
672 rqst->rq_rcv_buf.tail[0].iov_len = curlen;
673 copy_len -= curlen; ++i;
674 } else
675 rqst->rq_rcv_buf.tail[0].iov_len = 0;
676
Tom Talpey9191ca32008-10-09 15:01:11 -0400677 if (pad) {
678 /* implicit padding on terminal chunk */
679 unsigned char *p = rqst->rq_rcv_buf.tail[0].iov_base;
680 while (pad--)
681 p[rqst->rq_rcv_buf.tail[0].iov_len++] = 0;
682 }
683
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400684 if (copy_len)
685 dprintk("RPC: %s: %d bytes in"
686 " %d extra segments (%d lost)\n",
687 __func__, olen, i, copy_len);
688
689 /* TBD avoid a warning from call_decode() */
690 rqst->rq_private_buf = rqst->rq_rcv_buf;
691}
692
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400693void
Chuck Lever254f91e2014-05-28 10:32:17 -0400694rpcrdma_connect_worker(struct work_struct *work)
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400695{
Chuck Lever254f91e2014-05-28 10:32:17 -0400696 struct rpcrdma_ep *ep =
697 container_of(work, struct rpcrdma_ep, rep_connect_worker.work);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400698 struct rpc_xprt *xprt = ep->rep_xprt;
699
700 spin_lock_bh(&xprt->transport_lock);
Tom Talpey575448b2008-10-09 15:00:40 -0400701 if (++xprt->connect_cookie == 0) /* maintain a reserved value */
702 ++xprt->connect_cookie;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400703 if (ep->rep_connected > 0) {
704 if (!xprt_test_and_set_connected(xprt))
705 xprt_wake_pending_tasks(xprt, 0);
706 } else {
707 if (xprt_test_and_clear_connected(xprt))
Tom Talpey926449b2008-10-09 15:01:21 -0400708 xprt_wake_pending_tasks(xprt, -ENOTCONN);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400709 }
710 spin_unlock_bh(&xprt->transport_lock);
711}
712
713/*
Chuck Lever254f91e2014-05-28 10:32:17 -0400714 * This function is called when an async event is posted to
715 * the connection which changes the connection state. All it
716 * does at this point is mark the connection up/down, the rpc
717 * timers do the rest.
718 */
719void
720rpcrdma_conn_func(struct rpcrdma_ep *ep)
721{
722 schedule_delayed_work(&ep->rep_connect_worker, 0);
723}
724
725/*
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400726 * Called as a tasklet to do req/reply match and complete a request
727 * Errors must result in the RPC task either being awakened, or
728 * allowed to timeout, to discover the errors at that time.
729 */
730void
731rpcrdma_reply_handler(struct rpcrdma_rep *rep)
732{
733 struct rpcrdma_msg *headerp;
734 struct rpcrdma_req *req;
735 struct rpc_rqst *rqst;
736 struct rpc_xprt *xprt = rep->rr_xprt;
737 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
Al Viro2d8a9722007-10-29 04:37:58 +0000738 __be32 *iptr;
Chuck Levereba8ff62015-01-21 11:03:02 -0500739 int credits, rdmalen, status;
Chuck Levere7ce7102014-05-28 10:34:57 -0400740 unsigned long cwnd;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400741
742 /* Check status. If bad, signal disconnect and return rep to pool */
743 if (rep->rr_len == ~0U) {
744 rpcrdma_recv_buffer_put(rep);
745 if (r_xprt->rx_ep.rep_connected == 1) {
746 r_xprt->rx_ep.rep_connected = -EIO;
747 rpcrdma_conn_func(&r_xprt->rx_ep);
748 }
749 return;
750 }
Chuck Leverf2846482015-01-21 11:02:29 -0500751 if (rep->rr_len < RPCRDMA_HDRLEN_MIN) {
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400752 dprintk("RPC: %s: short/invalid reply\n", __func__);
753 goto repost;
754 }
755 headerp = (struct rpcrdma_msg *) rep->rr_base;
Chuck Lever284f4902015-01-21 11:02:13 -0500756 if (headerp->rm_vers != rpcrdma_version) {
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400757 dprintk("RPC: %s: invalid version %d\n",
Chuck Lever284f4902015-01-21 11:02:13 -0500758 __func__, be32_to_cpu(headerp->rm_vers));
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400759 goto repost;
760 }
761
762 /* Get XID and try for a match. */
763 spin_lock(&xprt->transport_lock);
764 rqst = xprt_lookup_rqst(xprt, headerp->rm_xid);
765 if (rqst == NULL) {
766 spin_unlock(&xprt->transport_lock);
767 dprintk("RPC: %s: reply 0x%p failed "
768 "to match any request xid 0x%08x len %d\n",
Chuck Lever052151a2015-01-21 11:02:21 -0500769 __func__, rep, be32_to_cpu(headerp->rm_xid),
770 rep->rr_len);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400771repost:
772 r_xprt->rx_stats.bad_reply_count++;
773 rep->rr_func = rpcrdma_reply_handler;
774 if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, &r_xprt->rx_ep, rep))
775 rpcrdma_recv_buffer_put(rep);
776
777 return;
778 }
779
780 /* get request object */
781 req = rpcr_to_rdmar(rqst);
Tom Tucker4a6862b2012-02-20 13:07:42 -0600782 if (req->rl_reply) {
783 spin_unlock(&xprt->transport_lock);
784 dprintk("RPC: %s: duplicate reply 0x%p to RPC "
785 "request 0x%p: xid 0x%08x\n", __func__, rep, req,
Chuck Lever052151a2015-01-21 11:02:21 -0500786 be32_to_cpu(headerp->rm_xid));
Tom Tucker4a6862b2012-02-20 13:07:42 -0600787 goto repost;
788 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400789
790 dprintk("RPC: %s: reply 0x%p completes request 0x%p\n"
791 " RPC request 0x%p xid 0x%08x\n",
Chuck Lever052151a2015-01-21 11:02:21 -0500792 __func__, rep, req, rqst,
793 be32_to_cpu(headerp->rm_xid));
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400794
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400795 /* from here on, the reply is no longer an orphan */
796 req->rl_reply = rep;
Chuck Lever18906972014-05-28 10:34:41 -0400797 xprt->reestablish_timeout = 0;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400798
799 /* check for expected message types */
800 /* The order of some of these tests is important. */
801 switch (headerp->rm_type) {
Chuck Lever284f4902015-01-21 11:02:13 -0500802 case rdma_msg:
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400803 /* never expect read chunks */
804 /* never expect reply chunks (two ways to check) */
805 /* never expect write chunks without having offered RDMA */
806 if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
807 (headerp->rm_body.rm_chunks[1] == xdr_zero &&
808 headerp->rm_body.rm_chunks[2] != xdr_zero) ||
809 (headerp->rm_body.rm_chunks[1] != xdr_zero &&
810 req->rl_nchunks == 0))
811 goto badheader;
812 if (headerp->rm_body.rm_chunks[1] != xdr_zero) {
813 /* count any expected write chunks in read reply */
814 /* start at write chunk array count */
815 iptr = &headerp->rm_body.rm_chunks[2];
816 rdmalen = rpcrdma_count_chunks(rep,
817 req->rl_nchunks, 1, &iptr);
818 /* check for validity, and no reply chunk after */
819 if (rdmalen < 0 || *iptr++ != xdr_zero)
820 goto badheader;
821 rep->rr_len -=
822 ((unsigned char *)iptr - (unsigned char *)headerp);
823 status = rep->rr_len + rdmalen;
824 r_xprt->rx_stats.total_rdma_reply += rdmalen;
Tom Talpey9191ca32008-10-09 15:01:11 -0400825 /* special case - last chunk may omit padding */
826 if (rdmalen &= 3) {
827 rdmalen = 4 - rdmalen;
828 status += rdmalen;
829 }
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400830 } else {
831 /* else ordinary inline */
Tom Talpey9191ca32008-10-09 15:01:11 -0400832 rdmalen = 0;
Chuck Leverf2846482015-01-21 11:02:29 -0500833 iptr = (__be32 *)((unsigned char *)headerp +
834 RPCRDMA_HDRLEN_MIN);
835 rep->rr_len -= RPCRDMA_HDRLEN_MIN;
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400836 status = rep->rr_len;
837 }
838 /* Fix up the rpc results for upper layer */
Tom Talpey9191ca32008-10-09 15:01:11 -0400839 rpcrdma_inline_fixup(rqst, (char *)iptr, rep->rr_len, rdmalen);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400840 break;
841
Chuck Lever284f4902015-01-21 11:02:13 -0500842 case rdma_nomsg:
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400843 /* never expect read or write chunks, always reply chunks */
844 if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
845 headerp->rm_body.rm_chunks[1] != xdr_zero ||
846 headerp->rm_body.rm_chunks[2] != xdr_one ||
847 req->rl_nchunks == 0)
848 goto badheader;
Chuck Leverf2846482015-01-21 11:02:29 -0500849 iptr = (__be32 *)((unsigned char *)headerp +
850 RPCRDMA_HDRLEN_MIN);
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400851 rdmalen = rpcrdma_count_chunks(rep, req->rl_nchunks, 0, &iptr);
852 if (rdmalen < 0)
853 goto badheader;
854 r_xprt->rx_stats.total_rdma_reply += rdmalen;
855 /* Reply chunk buffer already is the reply vector - no fixup. */
856 status = rdmalen;
857 break;
858
859badheader:
860 default:
861 dprintk("%s: invalid rpcrdma reply header (type %d):"
862 " chunks[012] == %d %d %d"
863 " expected chunks <= %d\n",
Chuck Lever284f4902015-01-21 11:02:13 -0500864 __func__, be32_to_cpu(headerp->rm_type),
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400865 headerp->rm_body.rm_chunks[0],
866 headerp->rm_body.rm_chunks[1],
867 headerp->rm_body.rm_chunks[2],
868 req->rl_nchunks);
869 status = -EIO;
870 r_xprt->rx_stats.bad_reply_count++;
871 break;
872 }
873
Chuck Levereba8ff62015-01-21 11:03:02 -0500874 credits = be32_to_cpu(headerp->rm_credit);
875 if (credits == 0)
876 credits = 1; /* don't deadlock */
877 else if (credits > r_xprt->rx_buf.rb_max_requests)
878 credits = r_xprt->rx_buf.rb_max_requests;
879
Chuck Levere7ce7102014-05-28 10:34:57 -0400880 cwnd = xprt->cwnd;
Chuck Levereba8ff62015-01-21 11:03:02 -0500881 xprt->cwnd = credits << RPC_CWNDSHIFT;
Chuck Levere7ce7102014-05-28 10:34:57 -0400882 if (xprt->cwnd > cwnd)
883 xprt_release_rqst_cong(rqst->rq_task);
884
\"Talpey, Thomas\e9601822007-09-10 13:50:42 -0400885 dprintk("RPC: %s: xprt_complete_rqst(0x%p, 0x%p, %d)\n",
886 __func__, xprt, rqst, status);
887 xprt_complete_rqst(rqst->rq_task, status);
888 spin_unlock(&xprt->transport_lock);
889}