blob: 73e600ffd87ff533d5091b866ab7f5bff586663b [file] [log] [blame]
Andy Grover7875e182009-02-24 15:30:26 +00001/*
2 * Copyright (c) 2006 Oracle. 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
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * 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
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34
35#include "rds.h"
36#include "rdma.h"
37
38static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq);
39
40static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
41[RDS_EXTHDR_NONE] = 0,
42[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
43[RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma),
44[RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest),
45};
46
47
48void rds_message_addref(struct rds_message *rm)
49{
50 rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
51 atomic_inc(&rm->m_refcount);
52}
Andy Grover616b7572009-08-21 12:28:32 +000053EXPORT_SYMBOL_GPL(rds_message_addref);
Andy Grover7875e182009-02-24 15:30:26 +000054
55/*
56 * This relies on dma_map_sg() not touching sg[].page during merging.
57 */
58static void rds_message_purge(struct rds_message *rm)
59{
60 unsigned long i;
61
62 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
63 return;
64
65 for (i = 0; i < rm->m_nents; i++) {
66 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i]));
67 /* XXX will have to put_page for page refs */
68 __free_page(sg_page(&rm->m_sg[i]));
69 }
70 rm->m_nents = 0;
71
72 if (rm->m_rdma_op)
73 rds_rdma_free_op(rm->m_rdma_op);
74 if (rm->m_rdma_mr)
75 rds_mr_put(rm->m_rdma_mr);
76}
77
78void rds_message_inc_purge(struct rds_incoming *inc)
79{
80 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
81 rds_message_purge(rm);
82}
83
84void rds_message_put(struct rds_message *rm)
85{
86 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
87
88 if (atomic_dec_and_test(&rm->m_refcount)) {
89 BUG_ON(!list_empty(&rm->m_sock_item));
90 BUG_ON(!list_empty(&rm->m_conn_item));
91 rds_message_purge(rm);
92
93 kfree(rm);
94 }
95}
Andy Grover616b7572009-08-21 12:28:32 +000096EXPORT_SYMBOL_GPL(rds_message_put);
Andy Grover7875e182009-02-24 15:30:26 +000097
98void rds_message_inc_free(struct rds_incoming *inc)
99{
100 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
101 rds_message_put(rm);
102}
103
104void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
105 __be16 dport, u64 seq)
106{
107 hdr->h_flags = 0;
108 hdr->h_sport = sport;
109 hdr->h_dport = dport;
110 hdr->h_sequence = cpu_to_be64(seq);
111 hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
112}
Andy Grover616b7572009-08-21 12:28:32 +0000113EXPORT_SYMBOL_GPL(rds_message_populate_header);
Andy Grover7875e182009-02-24 15:30:26 +0000114
115int rds_message_add_extension(struct rds_header *hdr,
116 unsigned int type, const void *data, unsigned int len)
117{
118 unsigned int ext_len = sizeof(u8) + len;
119 unsigned char *dst;
120
121 /* For now, refuse to add more than one extension header */
122 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
123 return 0;
124
Joe Perchesf64f9e72009-11-29 16:55:45 -0800125 if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
Andy Grover7875e182009-02-24 15:30:26 +0000126 return 0;
127
128 if (ext_len >= RDS_HEADER_EXT_SPACE)
129 return 0;
130 dst = hdr->h_exthdr;
131
132 *dst++ = type;
133 memcpy(dst, data, len);
134
135 dst[len] = RDS_EXTHDR_NONE;
136 return 1;
137}
Andy Grover616b7572009-08-21 12:28:32 +0000138EXPORT_SYMBOL_GPL(rds_message_add_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000139
140/*
141 * If a message has extension headers, retrieve them here.
142 * Call like this:
143 *
144 * unsigned int pos = 0;
145 *
146 * while (1) {
147 * buflen = sizeof(buffer);
148 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
149 * if (type == RDS_EXTHDR_NONE)
150 * break;
151 * ...
152 * }
153 */
154int rds_message_next_extension(struct rds_header *hdr,
155 unsigned int *pos, void *buf, unsigned int *buflen)
156{
157 unsigned int offset, ext_type, ext_len;
158 u8 *src = hdr->h_exthdr;
159
160 offset = *pos;
161 if (offset >= RDS_HEADER_EXT_SPACE)
162 goto none;
163
164 /* Get the extension type and length. For now, the
165 * length is implied by the extension type. */
166 ext_type = src[offset++];
167
168 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
169 goto none;
170 ext_len = rds_exthdr_size[ext_type];
171 if (offset + ext_len > RDS_HEADER_EXT_SPACE)
172 goto none;
173
174 *pos = offset + ext_len;
175 if (ext_len < *buflen)
176 *buflen = ext_len;
177 memcpy(buf, src + offset, *buflen);
178 return ext_type;
179
180none:
181 *pos = RDS_HEADER_EXT_SPACE;
182 *buflen = 0;
183 return RDS_EXTHDR_NONE;
184}
185
186int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version)
187{
188 struct rds_ext_header_version ext_hdr;
189
190 ext_hdr.h_version = cpu_to_be32(version);
191 return rds_message_add_extension(hdr, RDS_EXTHDR_VERSION, &ext_hdr, sizeof(ext_hdr));
192}
193
194int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version)
195{
196 struct rds_ext_header_version ext_hdr;
197 unsigned int pos = 0, len = sizeof(ext_hdr);
198
199 /* We assume the version extension is the only one present */
200 if (rds_message_next_extension(hdr, &pos, &ext_hdr, &len) != RDS_EXTHDR_VERSION)
201 return 0;
202 *version = be32_to_cpu(ext_hdr.h_version);
203 return 1;
204}
205
206int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
207{
208 struct rds_ext_header_rdma_dest ext_hdr;
209
210 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
211 ext_hdr.h_rdma_offset = cpu_to_be32(offset);
212 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
213}
Andy Grover616b7572009-08-21 12:28:32 +0000214EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000215
216struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp)
217{
218 struct rds_message *rm;
219
220 rm = kzalloc(sizeof(struct rds_message) +
221 (nents * sizeof(struct scatterlist)), gfp);
222 if (!rm)
223 goto out;
224
225 if (nents)
226 sg_init_table(rm->m_sg, nents);
227 atomic_set(&rm->m_refcount, 1);
228 INIT_LIST_HEAD(&rm->m_sock_item);
229 INIT_LIST_HEAD(&rm->m_conn_item);
230 spin_lock_init(&rm->m_rs_lock);
231
232out:
233 return rm;
234}
235
236struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
237{
238 struct rds_message *rm;
239 unsigned int i;
240
241 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
242 if (rm == NULL)
243 return ERR_PTR(-ENOMEM);
244
245 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
246 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
247 rm->m_nents = ceil(total_len, PAGE_SIZE);
248
249 for (i = 0; i < rm->m_nents; ++i) {
250 sg_set_page(&rm->m_sg[i],
251 virt_to_page(page_addrs[i]),
252 PAGE_SIZE, 0);
253 }
254
255 return rm;
256}
257
258struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
259 size_t total_len)
260{
261 unsigned long to_copy;
262 unsigned long iov_off;
263 unsigned long sg_off;
264 struct rds_message *rm;
265 struct iovec *iov;
266 struct scatterlist *sg;
267 int ret;
268
269 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
270 if (rm == NULL) {
271 ret = -ENOMEM;
272 goto out;
273 }
274
275 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
276
277 /*
278 * now allocate and copy in the data payload.
279 */
280 sg = rm->m_sg;
281 iov = first_iov;
282 iov_off = 0;
283 sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
284
285 while (total_len) {
286 if (sg_page(sg) == NULL) {
287 ret = rds_page_remainder_alloc(sg, total_len,
288 GFP_HIGHUSER);
289 if (ret)
290 goto out;
291 rm->m_nents++;
292 sg_off = 0;
293 }
294
295 while (iov_off == iov->iov_len) {
296 iov_off = 0;
297 iov++;
298 }
299
300 to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
301 to_copy = min_t(size_t, to_copy, total_len);
302
303 rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
304 "sg [%p, %u, %u] + %lu\n",
305 to_copy, iov->iov_base, iov->iov_len, iov_off,
306 (void *)sg_page(sg), sg->offset, sg->length, sg_off);
307
308 ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
309 iov->iov_base + iov_off,
310 to_copy);
311 if (ret)
312 goto out;
313
314 iov_off += to_copy;
315 total_len -= to_copy;
316 sg_off += to_copy;
317
318 if (sg_off == sg->length)
319 sg++;
320 }
321
322 ret = 0;
323out:
324 if (ret) {
325 if (rm)
326 rds_message_put(rm);
327 rm = ERR_PTR(ret);
328 }
329 return rm;
330}
331
332int rds_message_inc_copy_to_user(struct rds_incoming *inc,
333 struct iovec *first_iov, size_t size)
334{
335 struct rds_message *rm;
336 struct iovec *iov;
337 struct scatterlist *sg;
338 unsigned long to_copy;
339 unsigned long iov_off;
340 unsigned long vec_off;
341 int copied;
342 int ret;
343 u32 len;
344
345 rm = container_of(inc, struct rds_message, m_inc);
346 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
347
348 iov = first_iov;
349 iov_off = 0;
350 sg = rm->m_sg;
351 vec_off = 0;
352 copied = 0;
353
354 while (copied < size && copied < len) {
355 while (iov_off == iov->iov_len) {
356 iov_off = 0;
357 iov++;
358 }
359
360 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off);
361 to_copy = min_t(size_t, to_copy, size - copied);
362 to_copy = min_t(unsigned long, to_copy, len - copied);
363
364 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to "
365 "sg [%p, %u, %u] + %lu\n",
366 to_copy, iov->iov_base, iov->iov_len, iov_off,
367 sg_page(sg), sg->offset, sg->length, vec_off);
368
369 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off,
370 iov->iov_base + iov_off,
371 to_copy);
372 if (ret) {
373 copied = ret;
374 break;
375 }
376
377 iov_off += to_copy;
378 vec_off += to_copy;
379 copied += to_copy;
380
381 if (vec_off == sg->length) {
382 vec_off = 0;
383 sg++;
384 }
385 }
386
387 return copied;
388}
389
390/*
391 * If the message is still on the send queue, wait until the transport
392 * is done with it. This is particularly important for RDMA operations.
393 */
394void rds_message_wait(struct rds_message *rm)
395{
396 wait_event(rds_message_flush_waitq,
397 !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
398}
399
400void rds_message_unmapped(struct rds_message *rm)
401{
402 clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
403 if (waitqueue_active(&rds_message_flush_waitq))
404 wake_up(&rds_message_flush_waitq);
405}
Andy Grover616b7572009-08-21 12:28:32 +0000406EXPORT_SYMBOL_GPL(rds_message_unmapped);
Andy Grover7875e182009-02-24 15:30:26 +0000407