blob: 9a1d67e001ba60a79608275ecfa3ed452f373b19 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Andy Grover7875e182009-02-24 15:30:26 +000035
36#include "rds.h"
37#include "rdma.h"
38
39static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq);
40
41static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
42[RDS_EXTHDR_NONE] = 0,
43[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
44[RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma),
45[RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest),
46};
47
48
49void rds_message_addref(struct rds_message *rm)
50{
51 rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
52 atomic_inc(&rm->m_refcount);
53}
Andy Grover616b7572009-08-21 12:28:32 +000054EXPORT_SYMBOL_GPL(rds_message_addref);
Andy Grover7875e182009-02-24 15:30:26 +000055
56/*
57 * This relies on dma_map_sg() not touching sg[].page during merging.
58 */
59static void rds_message_purge(struct rds_message *rm)
60{
61 unsigned long i;
62
63 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
64 return;
65
66 for (i = 0; i < rm->m_nents; i++) {
67 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i]));
68 /* XXX will have to put_page for page refs */
69 __free_page(sg_page(&rm->m_sg[i]));
70 }
71 rm->m_nents = 0;
72
73 if (rm->m_rdma_op)
74 rds_rdma_free_op(rm->m_rdma_op);
75 if (rm->m_rdma_mr)
76 rds_mr_put(rm->m_rdma_mr);
77}
78
79void rds_message_inc_purge(struct rds_incoming *inc)
80{
81 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
82 rds_message_purge(rm);
83}
84
85void rds_message_put(struct rds_message *rm)
86{
87 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
88
89 if (atomic_dec_and_test(&rm->m_refcount)) {
90 BUG_ON(!list_empty(&rm->m_sock_item));
91 BUG_ON(!list_empty(&rm->m_conn_item));
92 rds_message_purge(rm);
93
94 kfree(rm);
95 }
96}
Andy Grover616b7572009-08-21 12:28:32 +000097EXPORT_SYMBOL_GPL(rds_message_put);
Andy Grover7875e182009-02-24 15:30:26 +000098
99void rds_message_inc_free(struct rds_incoming *inc)
100{
101 struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
102 rds_message_put(rm);
103}
104
105void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
106 __be16 dport, u64 seq)
107{
108 hdr->h_flags = 0;
109 hdr->h_sport = sport;
110 hdr->h_dport = dport;
111 hdr->h_sequence = cpu_to_be64(seq);
112 hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
113}
Andy Grover616b7572009-08-21 12:28:32 +0000114EXPORT_SYMBOL_GPL(rds_message_populate_header);
Andy Grover7875e182009-02-24 15:30:26 +0000115
116int rds_message_add_extension(struct rds_header *hdr,
117 unsigned int type, const void *data, unsigned int len)
118{
119 unsigned int ext_len = sizeof(u8) + len;
120 unsigned char *dst;
121
122 /* For now, refuse to add more than one extension header */
123 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
124 return 0;
125
Joe Perchesf64f9e72009-11-29 16:55:45 -0800126 if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
Andy Grover7875e182009-02-24 15:30:26 +0000127 return 0;
128
129 if (ext_len >= RDS_HEADER_EXT_SPACE)
130 return 0;
131 dst = hdr->h_exthdr;
132
133 *dst++ = type;
134 memcpy(dst, data, len);
135
136 dst[len] = RDS_EXTHDR_NONE;
137 return 1;
138}
Andy Grover616b7572009-08-21 12:28:32 +0000139EXPORT_SYMBOL_GPL(rds_message_add_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000140
141/*
142 * If a message has extension headers, retrieve them here.
143 * Call like this:
144 *
145 * unsigned int pos = 0;
146 *
147 * while (1) {
148 * buflen = sizeof(buffer);
149 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
150 * if (type == RDS_EXTHDR_NONE)
151 * break;
152 * ...
153 * }
154 */
155int rds_message_next_extension(struct rds_header *hdr,
156 unsigned int *pos, void *buf, unsigned int *buflen)
157{
158 unsigned int offset, ext_type, ext_len;
159 u8 *src = hdr->h_exthdr;
160
161 offset = *pos;
162 if (offset >= RDS_HEADER_EXT_SPACE)
163 goto none;
164
165 /* Get the extension type and length. For now, the
166 * length is implied by the extension type. */
167 ext_type = src[offset++];
168
169 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
170 goto none;
171 ext_len = rds_exthdr_size[ext_type];
172 if (offset + ext_len > RDS_HEADER_EXT_SPACE)
173 goto none;
174
175 *pos = offset + ext_len;
176 if (ext_len < *buflen)
177 *buflen = ext_len;
178 memcpy(buf, src + offset, *buflen);
179 return ext_type;
180
181none:
182 *pos = RDS_HEADER_EXT_SPACE;
183 *buflen = 0;
184 return RDS_EXTHDR_NONE;
185}
186
187int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version)
188{
189 struct rds_ext_header_version ext_hdr;
190
191 ext_hdr.h_version = cpu_to_be32(version);
192 return rds_message_add_extension(hdr, RDS_EXTHDR_VERSION, &ext_hdr, sizeof(ext_hdr));
193}
194
195int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version)
196{
197 struct rds_ext_header_version ext_hdr;
198 unsigned int pos = 0, len = sizeof(ext_hdr);
199
200 /* We assume the version extension is the only one present */
201 if (rds_message_next_extension(hdr, &pos, &ext_hdr, &len) != RDS_EXTHDR_VERSION)
202 return 0;
203 *version = be32_to_cpu(ext_hdr.h_version);
204 return 1;
205}
206
207int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
208{
209 struct rds_ext_header_rdma_dest ext_hdr;
210
211 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
212 ext_hdr.h_rdma_offset = cpu_to_be32(offset);
213 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
214}
Andy Grover616b7572009-08-21 12:28:32 +0000215EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000216
217struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp)
218{
219 struct rds_message *rm;
220
221 rm = kzalloc(sizeof(struct rds_message) +
222 (nents * sizeof(struct scatterlist)), gfp);
223 if (!rm)
224 goto out;
225
226 if (nents)
227 sg_init_table(rm->m_sg, nents);
228 atomic_set(&rm->m_refcount, 1);
229 INIT_LIST_HEAD(&rm->m_sock_item);
230 INIT_LIST_HEAD(&rm->m_conn_item);
231 spin_lock_init(&rm->m_rs_lock);
232
233out:
234 return rm;
235}
236
237struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
238{
239 struct rds_message *rm;
240 unsigned int i;
241
242 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
243 if (rm == NULL)
244 return ERR_PTR(-ENOMEM);
245
246 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
247 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
248 rm->m_nents = ceil(total_len, PAGE_SIZE);
249
250 for (i = 0; i < rm->m_nents; ++i) {
251 sg_set_page(&rm->m_sg[i],
252 virt_to_page(page_addrs[i]),
253 PAGE_SIZE, 0);
254 }
255
256 return rm;
257}
258
259struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
260 size_t total_len)
261{
262 unsigned long to_copy;
263 unsigned long iov_off;
264 unsigned long sg_off;
265 struct rds_message *rm;
266 struct iovec *iov;
267 struct scatterlist *sg;
268 int ret;
269
270 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
271 if (rm == NULL) {
272 ret = -ENOMEM;
273 goto out;
274 }
275
276 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
277
278 /*
279 * now allocate and copy in the data payload.
280 */
281 sg = rm->m_sg;
282 iov = first_iov;
283 iov_off = 0;
284 sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
285
286 while (total_len) {
287 if (sg_page(sg) == NULL) {
288 ret = rds_page_remainder_alloc(sg, total_len,
289 GFP_HIGHUSER);
290 if (ret)
291 goto out;
292 rm->m_nents++;
293 sg_off = 0;
294 }
295
296 while (iov_off == iov->iov_len) {
297 iov_off = 0;
298 iov++;
299 }
300
301 to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
302 to_copy = min_t(size_t, to_copy, total_len);
303
304 rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
305 "sg [%p, %u, %u] + %lu\n",
306 to_copy, iov->iov_base, iov->iov_len, iov_off,
307 (void *)sg_page(sg), sg->offset, sg->length, sg_off);
308
309 ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
310 iov->iov_base + iov_off,
311 to_copy);
312 if (ret)
313 goto out;
314
315 iov_off += to_copy;
316 total_len -= to_copy;
317 sg_off += to_copy;
318
319 if (sg_off == sg->length)
320 sg++;
321 }
322
323 ret = 0;
324out:
325 if (ret) {
326 if (rm)
327 rds_message_put(rm);
328 rm = ERR_PTR(ret);
329 }
330 return rm;
331}
332
333int rds_message_inc_copy_to_user(struct rds_incoming *inc,
334 struct iovec *first_iov, size_t size)
335{
336 struct rds_message *rm;
337 struct iovec *iov;
338 struct scatterlist *sg;
339 unsigned long to_copy;
340 unsigned long iov_off;
341 unsigned long vec_off;
342 int copied;
343 int ret;
344 u32 len;
345
346 rm = container_of(inc, struct rds_message, m_inc);
347 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
348
349 iov = first_iov;
350 iov_off = 0;
351 sg = rm->m_sg;
352 vec_off = 0;
353 copied = 0;
354
355 while (copied < size && copied < len) {
356 while (iov_off == iov->iov_len) {
357 iov_off = 0;
358 iov++;
359 }
360
361 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off);
362 to_copy = min_t(size_t, to_copy, size - copied);
363 to_copy = min_t(unsigned long, to_copy, len - copied);
364
365 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to "
366 "sg [%p, %u, %u] + %lu\n",
367 to_copy, iov->iov_base, iov->iov_len, iov_off,
368 sg_page(sg), sg->offset, sg->length, vec_off);
369
370 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off,
371 iov->iov_base + iov_off,
372 to_copy);
373 if (ret) {
374 copied = ret;
375 break;
376 }
377
378 iov_off += to_copy;
379 vec_off += to_copy;
380 copied += to_copy;
381
382 if (vec_off == sg->length) {
383 vec_off = 0;
384 sg++;
385 }
386 }
387
388 return copied;
389}
390
391/*
392 * If the message is still on the send queue, wait until the transport
393 * is done with it. This is particularly important for RDMA operations.
394 */
395void rds_message_wait(struct rds_message *rm)
396{
397 wait_event(rds_message_flush_waitq,
398 !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
399}
400
401void rds_message_unmapped(struct rds_message *rm)
402{
403 clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
404 if (waitqueue_active(&rds_message_flush_waitq))
405 wake_up(&rds_message_flush_waitq);
406}
Andy Grover616b7572009-08-21 12:28:32 +0000407EXPORT_SYMBOL_GPL(rds_message_unmapped);
Andy Grover7875e182009-02-24 15:30:26 +0000408