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Linux/net/rds/message.c

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  1 /*
  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 
 38 static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq);
 39 
 40 static 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 
 48 void 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 EXPORT_SYMBOL_GPL(rds_message_addref);
 54 
 55 /*
 56  * This relies on dma_map_sg() not touching sg[].page during merging.
 57  */
 58 static 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 
 78 void 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 
 84 void 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 }
 96 EXPORT_SYMBOL_GPL(rds_message_put);
 97 
 98 void 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 
104 void 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 }
113 EXPORT_SYMBOL_GPL(rds_message_populate_header);
114 
115 int 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 
125         if (type >= __RDS_EXTHDR_MAX
126          || len != rds_exthdr_size[type])
127                 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 }
139 EXPORT_SYMBOL_GPL(rds_message_add_extension);
140 
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  */
155 int 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 
181 none:
182         *pos = RDS_HEADER_EXT_SPACE;
183         *buflen = 0;
184         return RDS_EXTHDR_NONE;
185 }
186 
187 int 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 
195 int 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 
207 int 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 }
215 EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
216 
217 struct 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 
233 out:
234         return rm;
235 }
236 
237 struct 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 
259 struct 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;
324 out:
325         if (ret) {
326                 if (rm)
327                         rds_message_put(rm);
328                 rm = ERR_PTR(ret);
329         }
330         return rm;
331 }
332 
333 int 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  */
395 void 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 
401 void 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 }
407 EXPORT_SYMBOL_GPL(rds_message_unmapped);
408 
409 

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