blob: 5a15dc8d0cd78bf63a27dfc0d9816477fa1959b8 [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}
53
54/*
55 * This relies on dma_map_sg() not touching sg[].page during merging.
56 */
57static void rds_message_purge(struct rds_message *rm)
58{
59 unsigned long i;
60
61 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
62 return;
63
64 for (i = 0; i < rm->m_nents; i++) {
65 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i]));
66 /* XXX will have to put_page for page refs */
67 __free_page(sg_page(&rm->m_sg[i]));
68 }
69 rm->m_nents = 0;
70
71 if (rm->m_rdma_op)
72 rds_rdma_free_op(rm->m_rdma_op);
73 if (rm->m_rdma_mr)
74 rds_mr_put(rm->m_rdma_mr);
75}
76
77void rds_message_inc_purge(struct rds_incoming *inc)
78{
79 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
80 rds_message_purge(rm);
81}
82
83void rds_message_put(struct rds_message *rm)
84{
85 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
86
87 if (atomic_dec_and_test(&rm->m_refcount)) {
88 BUG_ON(!list_empty(&rm->m_sock_item));
89 BUG_ON(!list_empty(&rm->m_conn_item));
90 rds_message_purge(rm);
91
92 kfree(rm);
93 }
94}
95
96void rds_message_inc_free(struct rds_incoming *inc)
97{
98 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
99 rds_message_put(rm);
100}
101
102void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
103 __be16 dport, u64 seq)
104{
105 hdr->h_flags = 0;
106 hdr->h_sport = sport;
107 hdr->h_dport = dport;
108 hdr->h_sequence = cpu_to_be64(seq);
109 hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
110}
111
112int rds_message_add_extension(struct rds_header *hdr,
113 unsigned int type, const void *data, unsigned int len)
114{
115 unsigned int ext_len = sizeof(u8) + len;
116 unsigned char *dst;
117
118 /* For now, refuse to add more than one extension header */
119 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
120 return 0;
121
122 if (type >= __RDS_EXTHDR_MAX
123 || len != rds_exthdr_size[type])
124 return 0;
125
126 if (ext_len >= RDS_HEADER_EXT_SPACE)
127 return 0;
128 dst = hdr->h_exthdr;
129
130 *dst++ = type;
131 memcpy(dst, data, len);
132
133 dst[len] = RDS_EXTHDR_NONE;
134 return 1;
135}
136
137/*
138 * If a message has extension headers, retrieve them here.
139 * Call like this:
140 *
141 * unsigned int pos = 0;
142 *
143 * while (1) {
144 * buflen = sizeof(buffer);
145 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
146 * if (type == RDS_EXTHDR_NONE)
147 * break;
148 * ...
149 * }
150 */
151int rds_message_next_extension(struct rds_header *hdr,
152 unsigned int *pos, void *buf, unsigned int *buflen)
153{
154 unsigned int offset, ext_type, ext_len;
155 u8 *src = hdr->h_exthdr;
156
157 offset = *pos;
158 if (offset >= RDS_HEADER_EXT_SPACE)
159 goto none;
160
161 /* Get the extension type and length. For now, the
162 * length is implied by the extension type. */
163 ext_type = src[offset++];
164
165 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
166 goto none;
167 ext_len = rds_exthdr_size[ext_type];
168 if (offset + ext_len > RDS_HEADER_EXT_SPACE)
169 goto none;
170
171 *pos = offset + ext_len;
172 if (ext_len < *buflen)
173 *buflen = ext_len;
174 memcpy(buf, src + offset, *buflen);
175 return ext_type;
176
177none:
178 *pos = RDS_HEADER_EXT_SPACE;
179 *buflen = 0;
180 return RDS_EXTHDR_NONE;
181}
182
183int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version)
184{
185 struct rds_ext_header_version ext_hdr;
186
187 ext_hdr.h_version = cpu_to_be32(version);
188 return rds_message_add_extension(hdr, RDS_EXTHDR_VERSION, &ext_hdr, sizeof(ext_hdr));
189}
190
191int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version)
192{
193 struct rds_ext_header_version ext_hdr;
194 unsigned int pos = 0, len = sizeof(ext_hdr);
195
196 /* We assume the version extension is the only one present */
197 if (rds_message_next_extension(hdr, &pos, &ext_hdr, &len) != RDS_EXTHDR_VERSION)
198 return 0;
199 *version = be32_to_cpu(ext_hdr.h_version);
200 return 1;
201}
202
203int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
204{
205 struct rds_ext_header_rdma_dest ext_hdr;
206
207 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
208 ext_hdr.h_rdma_offset = cpu_to_be32(offset);
209 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
210}
211
212struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp)
213{
214 struct rds_message *rm;
215
216 rm = kzalloc(sizeof(struct rds_message) +
217 (nents * sizeof(struct scatterlist)), gfp);
218 if (!rm)
219 goto out;
220
221 if (nents)
222 sg_init_table(rm->m_sg, nents);
223 atomic_set(&rm->m_refcount, 1);
224 INIT_LIST_HEAD(&rm->m_sock_item);
225 INIT_LIST_HEAD(&rm->m_conn_item);
226 spin_lock_init(&rm->m_rs_lock);
227
228out:
229 return rm;
230}
231
232struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
233{
234 struct rds_message *rm;
235 unsigned int i;
236
237 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
238 if (rm == NULL)
239 return ERR_PTR(-ENOMEM);
240
241 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
242 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
243 rm->m_nents = ceil(total_len, PAGE_SIZE);
244
245 for (i = 0; i < rm->m_nents; ++i) {
246 sg_set_page(&rm->m_sg[i],
247 virt_to_page(page_addrs[i]),
248 PAGE_SIZE, 0);
249 }
250
251 return rm;
252}
253
254struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
255 size_t total_len)
256{
257 unsigned long to_copy;
258 unsigned long iov_off;
259 unsigned long sg_off;
260 struct rds_message *rm;
261 struct iovec *iov;
262 struct scatterlist *sg;
263 int ret;
264
265 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
266 if (rm == NULL) {
267 ret = -ENOMEM;
268 goto out;
269 }
270
271 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
272
273 /*
274 * now allocate and copy in the data payload.
275 */
276 sg = rm->m_sg;
277 iov = first_iov;
278 iov_off = 0;
279 sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
280
281 while (total_len) {
282 if (sg_page(sg) == NULL) {
283 ret = rds_page_remainder_alloc(sg, total_len,
284 GFP_HIGHUSER);
285 if (ret)
286 goto out;
287 rm->m_nents++;
288 sg_off = 0;
289 }
290
291 while (iov_off == iov->iov_len) {
292 iov_off = 0;
293 iov++;
294 }
295
296 to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
297 to_copy = min_t(size_t, to_copy, total_len);
298
299 rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
300 "sg [%p, %u, %u] + %lu\n",
301 to_copy, iov->iov_base, iov->iov_len, iov_off,
302 (void *)sg_page(sg), sg->offset, sg->length, sg_off);
303
304 ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
305 iov->iov_base + iov_off,
306 to_copy);
307 if (ret)
308 goto out;
309
310 iov_off += to_copy;
311 total_len -= to_copy;
312 sg_off += to_copy;
313
314 if (sg_off == sg->length)
315 sg++;
316 }
317
318 ret = 0;
319out:
320 if (ret) {
321 if (rm)
322 rds_message_put(rm);
323 rm = ERR_PTR(ret);
324 }
325 return rm;
326}
327
328int rds_message_inc_copy_to_user(struct rds_incoming *inc,
329 struct iovec *first_iov, size_t size)
330{
331 struct rds_message *rm;
332 struct iovec *iov;
333 struct scatterlist *sg;
334 unsigned long to_copy;
335 unsigned long iov_off;
336 unsigned long vec_off;
337 int copied;
338 int ret;
339 u32 len;
340
341 rm = container_of(inc, struct rds_message, m_inc);
342 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
343
344 iov = first_iov;
345 iov_off = 0;
346 sg = rm->m_sg;
347 vec_off = 0;
348 copied = 0;
349
350 while (copied < size && copied < len) {
351 while (iov_off == iov->iov_len) {
352 iov_off = 0;
353 iov++;
354 }
355
356 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off);
357 to_copy = min_t(size_t, to_copy, size - copied);
358 to_copy = min_t(unsigned long, to_copy, len - copied);
359
360 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to "
361 "sg [%p, %u, %u] + %lu\n",
362 to_copy, iov->iov_base, iov->iov_len, iov_off,
363 sg_page(sg), sg->offset, sg->length, vec_off);
364
365 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off,
366 iov->iov_base + iov_off,
367 to_copy);
368 if (ret) {
369 copied = ret;
370 break;
371 }
372
373 iov_off += to_copy;
374 vec_off += to_copy;
375 copied += to_copy;
376
377 if (vec_off == sg->length) {
378 vec_off = 0;
379 sg++;
380 }
381 }
382
383 return copied;
384}
385
386/*
387 * If the message is still on the send queue, wait until the transport
388 * is done with it. This is particularly important for RDMA operations.
389 */
390void rds_message_wait(struct rds_message *rm)
391{
392 wait_event(rds_message_flush_waitq,
393 !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
394}
395
396void rds_message_unmapped(struct rds_message *rm)
397{
398 clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
399 if (waitqueue_active(&rds_message_flush_waitq))
400 wake_up(&rds_message_flush_waitq);
401}
402