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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 #include <linux/slab.h>
 35 #include <linux/export.h>
 36 
 37 #include "rds.h"
 38 
 39 static unsigned int     rds_exthdr_size[__RDS_EXTHDR_MAX] = {
 40 [RDS_EXTHDR_NONE]       = 0,
 41 [RDS_EXTHDR_VERSION]    = sizeof(struct rds_ext_header_version),
 42 [RDS_EXTHDR_RDMA]       = sizeof(struct rds_ext_header_rdma),
 43 [RDS_EXTHDR_RDMA_DEST]  = sizeof(struct rds_ext_header_rdma_dest),
 44 };
 45 
 46 
 47 void rds_message_addref(struct rds_message *rm)
 48 {
 49         rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
 50         atomic_inc(&rm->m_refcount);
 51 }
 52 EXPORT_SYMBOL_GPL(rds_message_addref);
 53 
 54 /*
 55  * This relies on dma_map_sg() not touching sg[].page during merging.
 56  */
 57 static 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->data.op_nents; i++) {
 65                 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.op_sg[i]));
 66                 /* XXX will have to put_page for page refs */
 67                 __free_page(sg_page(&rm->data.op_sg[i]));
 68         }
 69         rm->data.op_nents = 0;
 70 
 71         if (rm->rdma.op_active)
 72                 rds_rdma_free_op(&rm->rdma);
 73         if (rm->rdma.op_rdma_mr)
 74                 rds_mr_put(rm->rdma.op_rdma_mr);
 75 
 76         if (rm->atomic.op_active)
 77                 rds_atomic_free_op(&rm->atomic);
 78         if (rm->atomic.op_rdma_mr)
 79                 rds_mr_put(rm->atomic.op_rdma_mr);
 80 }
 81 
 82 void rds_message_put(struct rds_message *rm)
 83 {
 84         rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
 85         if (atomic_read(&rm->m_refcount) == 0) {
 86 printk(KERN_CRIT "danger refcount zero on %p\n", rm);
 87 WARN_ON(1);
 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 }
 97 EXPORT_SYMBOL_GPL(rds_message_put);
 98 
 99 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
100                                  __be16 dport, u64 seq)
101 {
102         hdr->h_flags = 0;
103         hdr->h_sport = sport;
104         hdr->h_dport = dport;
105         hdr->h_sequence = cpu_to_be64(seq);
106         hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
107 }
108 EXPORT_SYMBOL_GPL(rds_message_populate_header);
109 
110 int rds_message_add_extension(struct rds_header *hdr, unsigned int type,
111                               const void *data, unsigned int len)
112 {
113         unsigned int ext_len = sizeof(u8) + len;
114         unsigned char *dst;
115 
116         /* For now, refuse to add more than one extension header */
117         if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
118                 return 0;
119 
120         if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
121                 return 0;
122 
123         if (ext_len >= RDS_HEADER_EXT_SPACE)
124                 return 0;
125         dst = hdr->h_exthdr;
126 
127         *dst++ = type;
128         memcpy(dst, data, len);
129 
130         dst[len] = RDS_EXTHDR_NONE;
131         return 1;
132 }
133 EXPORT_SYMBOL_GPL(rds_message_add_extension);
134 
135 /*
136  * If a message has extension headers, retrieve them here.
137  * Call like this:
138  *
139  * unsigned int pos = 0;
140  *
141  * while (1) {
142  *      buflen = sizeof(buffer);
143  *      type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
144  *      if (type == RDS_EXTHDR_NONE)
145  *              break;
146  *      ...
147  * }
148  */
149 int rds_message_next_extension(struct rds_header *hdr,
150                 unsigned int *pos, void *buf, unsigned int *buflen)
151 {
152         unsigned int offset, ext_type, ext_len;
153         u8 *src = hdr->h_exthdr;
154 
155         offset = *pos;
156         if (offset >= RDS_HEADER_EXT_SPACE)
157                 goto none;
158 
159         /* Get the extension type and length. For now, the
160          * length is implied by the extension type. */
161         ext_type = src[offset++];
162 
163         if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
164                 goto none;
165         ext_len = rds_exthdr_size[ext_type];
166         if (offset + ext_len > RDS_HEADER_EXT_SPACE)
167                 goto none;
168 
169         *pos = offset + ext_len;
170         if (ext_len < *buflen)
171                 *buflen = ext_len;
172         memcpy(buf, src + offset, *buflen);
173         return ext_type;
174 
175 none:
176         *pos = RDS_HEADER_EXT_SPACE;
177         *buflen = 0;
178         return RDS_EXTHDR_NONE;
179 }
180 
181 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
182 {
183         struct rds_ext_header_rdma_dest ext_hdr;
184 
185         ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
186         ext_hdr.h_rdma_offset = cpu_to_be32(offset);
187         return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
188 }
189 EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
190 
191 /*
192  * Each rds_message is allocated with extra space for the scatterlist entries
193  * rds ops will need. This is to minimize memory allocation count. Then, each rds op
194  * can grab SGs when initializing its part of the rds_message.
195  */
196 struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
197 {
198         struct rds_message *rm;
199 
200         if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message))
201                 return NULL;
202 
203         rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
204         if (!rm)
205                 goto out;
206 
207         rm->m_used_sgs = 0;
208         rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
209 
210         atomic_set(&rm->m_refcount, 1);
211         INIT_LIST_HEAD(&rm->m_sock_item);
212         INIT_LIST_HEAD(&rm->m_conn_item);
213         spin_lock_init(&rm->m_rs_lock);
214         init_waitqueue_head(&rm->m_flush_wait);
215 
216 out:
217         return rm;
218 }
219 
220 /*
221  * RDS ops use this to grab SG entries from the rm's sg pool.
222  */
223 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
224 {
225         struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
226         struct scatterlist *sg_ret;
227 
228         WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
229         WARN_ON(!nents);
230 
231         if (rm->m_used_sgs + nents > rm->m_total_sgs)
232                 return NULL;
233 
234         sg_ret = &sg_first[rm->m_used_sgs];
235         sg_init_table(sg_ret, nents);
236         rm->m_used_sgs += nents;
237 
238         return sg_ret;
239 }
240 
241 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
242 {
243         struct rds_message *rm;
244         unsigned int i;
245         int num_sgs = ceil(total_len, PAGE_SIZE);
246         int extra_bytes = num_sgs * sizeof(struct scatterlist);
247 
248         rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
249         if (!rm)
250                 return ERR_PTR(-ENOMEM);
251 
252         set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
253         rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
254         rm->data.op_nents = ceil(total_len, PAGE_SIZE);
255         rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
256         if (!rm->data.op_sg) {
257                 rds_message_put(rm);
258                 return ERR_PTR(-ENOMEM);
259         }
260 
261         for (i = 0; i < rm->data.op_nents; ++i) {
262                 sg_set_page(&rm->data.op_sg[i],
263                                 virt_to_page(page_addrs[i]),
264                                 PAGE_SIZE, 0);
265         }
266 
267         return rm;
268 }
269 
270 int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
271                                                size_t total_len)
272 {
273         unsigned long to_copy;
274         unsigned long iov_off;
275         unsigned long sg_off;
276         struct iovec *iov;
277         struct scatterlist *sg;
278         int ret = 0;
279 
280         rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
281 
282         /*
283          * now allocate and copy in the data payload.
284          */
285         sg = rm->data.op_sg;
286         iov = first_iov;
287         iov_off = 0;
288         sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
289 
290         while (total_len) {
291                 if (!sg_page(sg)) {
292                         ret = rds_page_remainder_alloc(sg, total_len,
293                                                        GFP_HIGHUSER);
294                         if (ret)
295                                 goto out;
296                         rm->data.op_nents++;
297                         sg_off = 0;
298                 }
299 
300                 while (iov_off == iov->iov_len) {
301                         iov_off = 0;
302                         iov++;
303                 }
304 
305                 to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
306                 to_copy = min_t(size_t, to_copy, total_len);
307 
308                 rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
309                          "sg [%p, %u, %u] + %lu\n",
310                          to_copy, iov->iov_base, iov->iov_len, iov_off,
311                          (void *)sg_page(sg), sg->offset, sg->length, sg_off);
312 
313                 ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
314                                               iov->iov_base + iov_off,
315                                               to_copy);
316                 if (ret)
317                         goto out;
318 
319                 iov_off += to_copy;
320                 total_len -= to_copy;
321                 sg_off += to_copy;
322 
323                 if (sg_off == sg->length)
324                         sg++;
325         }
326 
327 out:
328         return ret;
329 }
330 
331 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
332                                  struct iovec *first_iov, size_t size)
333 {
334         struct rds_message *rm;
335         struct iovec *iov;
336         struct scatterlist *sg;
337         unsigned long to_copy;
338         unsigned long iov_off;
339         unsigned long vec_off;
340         int copied;
341         int ret;
342         u32 len;
343 
344         rm = container_of(inc, struct rds_message, m_inc);
345         len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
346 
347         iov = first_iov;
348         iov_off = 0;
349         sg = rm->data.op_sg;
350         vec_off = 0;
351         copied = 0;
352 
353         while (copied < size && copied < len) {
354                 while (iov_off == iov->iov_len) {
355                         iov_off = 0;
356                         iov++;
357                 }
358 
359                 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off);
360                 to_copy = min_t(size_t, to_copy, size - copied);
361                 to_copy = min_t(unsigned long, to_copy, len - copied);
362 
363                 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to "
364                          "sg [%p, %u, %u] + %lu\n",
365                          to_copy, iov->iov_base, iov->iov_len, iov_off,
366                          sg_page(sg), sg->offset, sg->length, vec_off);
367 
368                 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off,
369                                             iov->iov_base + iov_off,
370                                             to_copy);
371                 if (ret) {
372                         copied = ret;
373                         break;
374                 }
375 
376                 iov_off += to_copy;
377                 vec_off += to_copy;
378                 copied += to_copy;
379 
380                 if (vec_off == sg->length) {
381                         vec_off = 0;
382                         sg++;
383                 }
384         }
385 
386         return copied;
387 }
388 
389 /*
390  * If the message is still on the send queue, wait until the transport
391  * is done with it. This is particularly important for RDMA operations.
392  */
393 void rds_message_wait(struct rds_message *rm)
394 {
395         wait_event_interruptible(rm->m_flush_wait,
396                         !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
397 }
398 
399 void rds_message_unmapped(struct rds_message *rm)
400 {
401         clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
402         wake_up_interruptible(&rm->m_flush_wait);
403 }
404 EXPORT_SYMBOL_GPL(rds_message_unmapped);
405 
406 

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