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TOMOYO Linux Cross Reference
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         WARN(!atomic_read(&rm->m_refcount), "danger refcount zero on %p\n", rm);
 86         if (atomic_dec_and_test(&rm->m_refcount)) {
 87                 BUG_ON(!list_empty(&rm->m_sock_item));
 88                 BUG_ON(!list_empty(&rm->m_conn_item));
 89                 rds_message_purge(rm);
 90 
 91                 kfree(rm);
 92         }
 93 }
 94 EXPORT_SYMBOL_GPL(rds_message_put);
 95 
 96 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
 97                                  __be16 dport, u64 seq)
 98 {
 99         hdr->h_flags = 0;
100         hdr->h_sport = sport;
101         hdr->h_dport = dport;
102         hdr->h_sequence = cpu_to_be64(seq);
103         hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
104 }
105 EXPORT_SYMBOL_GPL(rds_message_populate_header);
106 
107 int rds_message_add_extension(struct rds_header *hdr, unsigned int type,
108                               const void *data, unsigned int len)
109 {
110         unsigned int ext_len = sizeof(u8) + len;
111         unsigned char *dst;
112 
113         /* For now, refuse to add more than one extension header */
114         if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
115                 return 0;
116 
117         if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
118                 return 0;
119 
120         if (ext_len >= RDS_HEADER_EXT_SPACE)
121                 return 0;
122         dst = hdr->h_exthdr;
123 
124         *dst++ = type;
125         memcpy(dst, data, len);
126 
127         dst[len] = RDS_EXTHDR_NONE;
128         return 1;
129 }
130 EXPORT_SYMBOL_GPL(rds_message_add_extension);
131 
132 /*
133  * If a message has extension headers, retrieve them here.
134  * Call like this:
135  *
136  * unsigned int pos = 0;
137  *
138  * while (1) {
139  *      buflen = sizeof(buffer);
140  *      type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
141  *      if (type == RDS_EXTHDR_NONE)
142  *              break;
143  *      ...
144  * }
145  */
146 int rds_message_next_extension(struct rds_header *hdr,
147                 unsigned int *pos, void *buf, unsigned int *buflen)
148 {
149         unsigned int offset, ext_type, ext_len;
150         u8 *src = hdr->h_exthdr;
151 
152         offset = *pos;
153         if (offset >= RDS_HEADER_EXT_SPACE)
154                 goto none;
155 
156         /* Get the extension type and length. For now, the
157          * length is implied by the extension type. */
158         ext_type = src[offset++];
159 
160         if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
161                 goto none;
162         ext_len = rds_exthdr_size[ext_type];
163         if (offset + ext_len > RDS_HEADER_EXT_SPACE)
164                 goto none;
165 
166         *pos = offset + ext_len;
167         if (ext_len < *buflen)
168                 *buflen = ext_len;
169         memcpy(buf, src + offset, *buflen);
170         return ext_type;
171 
172 none:
173         *pos = RDS_HEADER_EXT_SPACE;
174         *buflen = 0;
175         return RDS_EXTHDR_NONE;
176 }
177 
178 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
179 {
180         struct rds_ext_header_rdma_dest ext_hdr;
181 
182         ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
183         ext_hdr.h_rdma_offset = cpu_to_be32(offset);
184         return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
185 }
186 EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
187 
188 /*
189  * Each rds_message is allocated with extra space for the scatterlist entries
190  * rds ops will need. This is to minimize memory allocation count. Then, each rds op
191  * can grab SGs when initializing its part of the rds_message.
192  */
193 struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
194 {
195         struct rds_message *rm;
196 
197         if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message))
198                 return NULL;
199 
200         rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
201         if (!rm)
202                 goto out;
203 
204         rm->m_used_sgs = 0;
205         rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
206 
207         atomic_set(&rm->m_refcount, 1);
208         INIT_LIST_HEAD(&rm->m_sock_item);
209         INIT_LIST_HEAD(&rm->m_conn_item);
210         spin_lock_init(&rm->m_rs_lock);
211         init_waitqueue_head(&rm->m_flush_wait);
212 
213 out:
214         return rm;
215 }
216 
217 /*
218  * RDS ops use this to grab SG entries from the rm's sg pool.
219  */
220 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
221 {
222         struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
223         struct scatterlist *sg_ret;
224 
225         WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
226         WARN_ON(!nents);
227 
228         if (rm->m_used_sgs + nents > rm->m_total_sgs)
229                 return NULL;
230 
231         sg_ret = &sg_first[rm->m_used_sgs];
232         sg_init_table(sg_ret, nents);
233         rm->m_used_sgs += nents;
234 
235         return sg_ret;
236 }
237 
238 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
239 {
240         struct rds_message *rm;
241         unsigned int i;
242         int num_sgs = ceil(total_len, PAGE_SIZE);
243         int extra_bytes = num_sgs * sizeof(struct scatterlist);
244 
245         rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
246         if (!rm)
247                 return ERR_PTR(-ENOMEM);
248 
249         set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
250         rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
251         rm->data.op_nents = ceil(total_len, PAGE_SIZE);
252         rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
253         if (!rm->data.op_sg) {
254                 rds_message_put(rm);
255                 return ERR_PTR(-ENOMEM);
256         }
257 
258         for (i = 0; i < rm->data.op_nents; ++i) {
259                 sg_set_page(&rm->data.op_sg[i],
260                                 virt_to_page(page_addrs[i]),
261                                 PAGE_SIZE, 0);
262         }
263 
264         return rm;
265 }
266 
267 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from)
268 {
269         unsigned long to_copy;
270         unsigned long sg_off;
271         struct scatterlist *sg;
272         int ret = 0;
273 
274         rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
275 
276         /*
277          * now allocate and copy in the data payload.
278          */
279         sg = rm->data.op_sg;
280         sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
281 
282         while (iov_iter_count(from)) {
283                 if (!sg_page(sg)) {
284                         ret = rds_page_remainder_alloc(sg, iov_iter_count(from),
285                                                        GFP_HIGHUSER);
286                         if (ret)
287                                 return ret;
288                         rm->data.op_nents++;
289                         sg_off = 0;
290                 }
291 
292                 to_copy = min_t(unsigned long, iov_iter_count(from),
293                                 sg->length - sg_off);
294 
295                 rds_stats_add(s_copy_from_user, to_copy);
296                 ret = copy_page_from_iter(sg_page(sg), sg->offset + sg_off,
297                                           to_copy, from);
298                 if (ret != to_copy)
299                         return -EFAULT;
300 
301                 sg_off += to_copy;
302 
303                 if (sg_off == sg->length)
304                         sg++;
305         }
306 
307         return ret;
308 }
309 
310 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to)
311 {
312         struct rds_message *rm;
313         struct scatterlist *sg;
314         unsigned long to_copy;
315         unsigned long vec_off;
316         int copied;
317         int ret;
318         u32 len;
319 
320         rm = container_of(inc, struct rds_message, m_inc);
321         len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
322 
323         sg = rm->data.op_sg;
324         vec_off = 0;
325         copied = 0;
326 
327         while (iov_iter_count(to) && copied < len) {
328                 to_copy = min_t(unsigned long, iov_iter_count(to),
329                                 sg->length - vec_off);
330                 to_copy = min_t(unsigned long, to_copy, len - copied);
331 
332                 rds_stats_add(s_copy_to_user, to_copy);
333                 ret = copy_page_to_iter(sg_page(sg), sg->offset + vec_off,
334                                         to_copy, to);
335                 if (ret != to_copy)
336                         return -EFAULT;
337 
338                 vec_off += to_copy;
339                 copied += to_copy;
340 
341                 if (vec_off == sg->length) {
342                         vec_off = 0;
343                         sg++;
344                 }
345         }
346 
347         return copied;
348 }
349 
350 /*
351  * If the message is still on the send queue, wait until the transport
352  * is done with it. This is particularly important for RDMA operations.
353  */
354 void rds_message_wait(struct rds_message *rm)
355 {
356         wait_event_interruptible(rm->m_flush_wait,
357                         !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
358 }
359 
360 void rds_message_unmapped(struct rds_message *rm)
361 {
362         clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
363         wake_up_interruptible(&rm->m_flush_wait);
364 }
365 EXPORT_SYMBOL_GPL(rds_message_unmapped);
366 
367 

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