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TOMOYO Linux Cross Reference
Linux/net/rds/message.c

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 #include <linux/skbuff.h>
 37 #include <linux/list.h>
 38 #include <linux/errqueue.h>
 39 
 40 #include "rds.h"
 41 
 42 static unsigned int     rds_exthdr_size[__RDS_EXTHDR_MAX] = {
 43 [RDS_EXTHDR_NONE]       = 0,
 44 [RDS_EXTHDR_VERSION]    = sizeof(struct rds_ext_header_version),
 45 [RDS_EXTHDR_RDMA]       = sizeof(struct rds_ext_header_rdma),
 46 [RDS_EXTHDR_RDMA_DEST]  = sizeof(struct rds_ext_header_rdma_dest),
 47 [RDS_EXTHDR_NPATHS]     = sizeof(u16),
 48 [RDS_EXTHDR_GEN_NUM]    = sizeof(u32),
 49 };
 50 
 51 void rds_message_addref(struct rds_message *rm)
 52 {
 53         rdsdebug("addref rm %p ref %d\n", rm, refcount_read(&rm->m_refcount));
 54         refcount_inc(&rm->m_refcount);
 55 }
 56 EXPORT_SYMBOL_GPL(rds_message_addref);
 57 
 58 static inline bool rds_zcookie_add(struct rds_msg_zcopy_info *info, u32 cookie)
 59 {
 60         struct rds_zcopy_cookies *ck = &info->zcookies;
 61         int ncookies = ck->num;
 62 
 63         if (ncookies == RDS_MAX_ZCOOKIES)
 64                 return false;
 65         ck->cookies[ncookies] = cookie;
 66         ck->num =  ++ncookies;
 67         return true;
 68 }
 69 
 70 static struct rds_msg_zcopy_info *rds_info_from_znotifier(struct rds_znotifier *znotif)
 71 {
 72         return container_of(znotif, struct rds_msg_zcopy_info, znotif);
 73 }
 74 
 75 void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *q)
 76 {
 77         unsigned long flags;
 78         LIST_HEAD(copy);
 79         struct rds_msg_zcopy_info *info, *tmp;
 80 
 81         spin_lock_irqsave(&q->lock, flags);
 82         list_splice(&q->zcookie_head, &copy);
 83         INIT_LIST_HEAD(&q->zcookie_head);
 84         spin_unlock_irqrestore(&q->lock, flags);
 85 
 86         list_for_each_entry_safe(info, tmp, &copy, rs_zcookie_next) {
 87                 list_del(&info->rs_zcookie_next);
 88                 kfree(info);
 89         }
 90 }
 91 
 92 static void rds_rm_zerocopy_callback(struct rds_sock *rs,
 93                                      struct rds_znotifier *znotif)
 94 {
 95         struct rds_msg_zcopy_info *info;
 96         struct rds_msg_zcopy_queue *q;
 97         u32 cookie = znotif->z_cookie;
 98         struct rds_zcopy_cookies *ck;
 99         struct list_head *head;
100         unsigned long flags;
101 
102         mm_unaccount_pinned_pages(&znotif->z_mmp);
103         q = &rs->rs_zcookie_queue;
104         spin_lock_irqsave(&q->lock, flags);
105         head = &q->zcookie_head;
106         if (!list_empty(head)) {
107                 info = list_entry(head, struct rds_msg_zcopy_info,
108                                   rs_zcookie_next);
109                 if (info && rds_zcookie_add(info, cookie)) {
110                         spin_unlock_irqrestore(&q->lock, flags);
111                         kfree(rds_info_from_znotifier(znotif));
112                         /* caller invokes rds_wake_sk_sleep() */
113                         return;
114                 }
115         }
116 
117         info = rds_info_from_znotifier(znotif);
118         ck = &info->zcookies;
119         memset(ck, 0, sizeof(*ck));
120         WARN_ON(!rds_zcookie_add(info, cookie));
121         list_add_tail(&q->zcookie_head, &info->rs_zcookie_next);
122 
123         spin_unlock_irqrestore(&q->lock, flags);
124         /* caller invokes rds_wake_sk_sleep() */
125 }
126 
127 /*
128  * This relies on dma_map_sg() not touching sg[].page during merging.
129  */
130 static void rds_message_purge(struct rds_message *rm)
131 {
132         unsigned long i, flags;
133         bool zcopy = false;
134 
135         if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
136                 return;
137 
138         spin_lock_irqsave(&rm->m_rs_lock, flags);
139         if (rm->m_rs) {
140                 struct rds_sock *rs = rm->m_rs;
141 
142                 if (rm->data.op_mmp_znotifier) {
143                         zcopy = true;
144                         rds_rm_zerocopy_callback(rs, rm->data.op_mmp_znotifier);
145                         rds_wake_sk_sleep(rs);
146                         rm->data.op_mmp_znotifier = NULL;
147                 }
148                 sock_put(rds_rs_to_sk(rs));
149                 rm->m_rs = NULL;
150         }
151         spin_unlock_irqrestore(&rm->m_rs_lock, flags);
152 
153         for (i = 0; i < rm->data.op_nents; i++) {
154                 /* XXX will have to put_page for page refs */
155                 if (!zcopy)
156                         __free_page(sg_page(&rm->data.op_sg[i]));
157                 else
158                         put_page(sg_page(&rm->data.op_sg[i]));
159         }
160         rm->data.op_nents = 0;
161 
162         if (rm->rdma.op_active)
163                 rds_rdma_free_op(&rm->rdma);
164         if (rm->rdma.op_rdma_mr)
165                 rds_mr_put(rm->rdma.op_rdma_mr);
166 
167         if (rm->atomic.op_active)
168                 rds_atomic_free_op(&rm->atomic);
169         if (rm->atomic.op_rdma_mr)
170                 rds_mr_put(rm->atomic.op_rdma_mr);
171 }
172 
173 void rds_message_put(struct rds_message *rm)
174 {
175         rdsdebug("put rm %p ref %d\n", rm, refcount_read(&rm->m_refcount));
176         WARN(!refcount_read(&rm->m_refcount), "danger refcount zero on %p\n", rm);
177         if (refcount_dec_and_test(&rm->m_refcount)) {
178                 BUG_ON(!list_empty(&rm->m_sock_item));
179                 BUG_ON(!list_empty(&rm->m_conn_item));
180                 rds_message_purge(rm);
181 
182                 kfree(rm);
183         }
184 }
185 EXPORT_SYMBOL_GPL(rds_message_put);
186 
187 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
188                                  __be16 dport, u64 seq)
189 {
190         hdr->h_flags = 0;
191         hdr->h_sport = sport;
192         hdr->h_dport = dport;
193         hdr->h_sequence = cpu_to_be64(seq);
194         hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
195 }
196 EXPORT_SYMBOL_GPL(rds_message_populate_header);
197 
198 int rds_message_add_extension(struct rds_header *hdr, unsigned int type,
199                               const void *data, unsigned int len)
200 {
201         unsigned int ext_len = sizeof(u8) + len;
202         unsigned char *dst;
203 
204         /* For now, refuse to add more than one extension header */
205         if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
206                 return 0;
207 
208         if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
209                 return 0;
210 
211         if (ext_len >= RDS_HEADER_EXT_SPACE)
212                 return 0;
213         dst = hdr->h_exthdr;
214 
215         *dst++ = type;
216         memcpy(dst, data, len);
217 
218         dst[len] = RDS_EXTHDR_NONE;
219         return 1;
220 }
221 EXPORT_SYMBOL_GPL(rds_message_add_extension);
222 
223 /*
224  * If a message has extension headers, retrieve them here.
225  * Call like this:
226  *
227  * unsigned int pos = 0;
228  *
229  * while (1) {
230  *      buflen = sizeof(buffer);
231  *      type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
232  *      if (type == RDS_EXTHDR_NONE)
233  *              break;
234  *      ...
235  * }
236  */
237 int rds_message_next_extension(struct rds_header *hdr,
238                 unsigned int *pos, void *buf, unsigned int *buflen)
239 {
240         unsigned int offset, ext_type, ext_len;
241         u8 *src = hdr->h_exthdr;
242 
243         offset = *pos;
244         if (offset >= RDS_HEADER_EXT_SPACE)
245                 goto none;
246 
247         /* Get the extension type and length. For now, the
248          * length is implied by the extension type. */
249         ext_type = src[offset++];
250 
251         if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
252                 goto none;
253         ext_len = rds_exthdr_size[ext_type];
254         if (offset + ext_len > RDS_HEADER_EXT_SPACE)
255                 goto none;
256 
257         *pos = offset + ext_len;
258         if (ext_len < *buflen)
259                 *buflen = ext_len;
260         memcpy(buf, src + offset, *buflen);
261         return ext_type;
262 
263 none:
264         *pos = RDS_HEADER_EXT_SPACE;
265         *buflen = 0;
266         return RDS_EXTHDR_NONE;
267 }
268 
269 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
270 {
271         struct rds_ext_header_rdma_dest ext_hdr;
272 
273         ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
274         ext_hdr.h_rdma_offset = cpu_to_be32(offset);
275         return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
276 }
277 EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
278 
279 /*
280  * Each rds_message is allocated with extra space for the scatterlist entries
281  * rds ops will need. This is to minimize memory allocation count. Then, each rds op
282  * can grab SGs when initializing its part of the rds_message.
283  */
284 struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
285 {
286         struct rds_message *rm;
287 
288         if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message))
289                 return NULL;
290 
291         rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
292         if (!rm)
293                 goto out;
294 
295         rm->m_used_sgs = 0;
296         rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
297 
298         refcount_set(&rm->m_refcount, 1);
299         INIT_LIST_HEAD(&rm->m_sock_item);
300         INIT_LIST_HEAD(&rm->m_conn_item);
301         spin_lock_init(&rm->m_rs_lock);
302         init_waitqueue_head(&rm->m_flush_wait);
303 
304 out:
305         return rm;
306 }
307 
308 /*
309  * RDS ops use this to grab SG entries from the rm's sg pool.
310  */
311 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents,
312                                           int *ret)
313 {
314         struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
315         struct scatterlist *sg_ret;
316 
317         if (WARN_ON(!ret))
318                 return NULL;
319 
320         if (nents <= 0) {
321                 pr_warn("rds: alloc sgs failed! nents <= 0\n");
322                 *ret = -EINVAL;
323                 return NULL;
324         }
325 
326         if (rm->m_used_sgs + nents > rm->m_total_sgs) {
327                 pr_warn("rds: alloc sgs failed! total %d used %d nents %d\n",
328                         rm->m_total_sgs, rm->m_used_sgs, nents);
329                 *ret = -ENOMEM;
330                 return NULL;
331         }
332 
333         sg_ret = &sg_first[rm->m_used_sgs];
334         sg_init_table(sg_ret, nents);
335         rm->m_used_sgs += nents;
336 
337         return sg_ret;
338 }
339 
340 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
341 {
342         struct rds_message *rm;
343         unsigned int i;
344         int num_sgs = DIV_ROUND_UP(total_len, PAGE_SIZE);
345         int extra_bytes = num_sgs * sizeof(struct scatterlist);
346         int ret;
347 
348         rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
349         if (!rm)
350                 return ERR_PTR(-ENOMEM);
351 
352         set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
353         rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
354         rm->data.op_nents = DIV_ROUND_UP(total_len, PAGE_SIZE);
355         rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs, &ret);
356         if (!rm->data.op_sg) {
357                 rds_message_put(rm);
358                 return ERR_PTR(ret);
359         }
360 
361         for (i = 0; i < rm->data.op_nents; ++i) {
362                 sg_set_page(&rm->data.op_sg[i],
363                                 virt_to_page(page_addrs[i]),
364                                 PAGE_SIZE, 0);
365         }
366 
367         return rm;
368 }
369 
370 static int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from)
371 {
372         struct scatterlist *sg;
373         int ret = 0;
374         int length = iov_iter_count(from);
375         int total_copied = 0;
376         struct rds_msg_zcopy_info *info;
377 
378         rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
379 
380         /*
381          * now allocate and copy in the data payload.
382          */
383         sg = rm->data.op_sg;
384 
385         info = kzalloc(sizeof(*info), GFP_KERNEL);
386         if (!info)
387                 return -ENOMEM;
388         INIT_LIST_HEAD(&info->rs_zcookie_next);
389         rm->data.op_mmp_znotifier = &info->znotif;
390         if (mm_account_pinned_pages(&rm->data.op_mmp_znotifier->z_mmp,
391                                     length)) {
392                 ret = -ENOMEM;
393                 goto err;
394         }
395         while (iov_iter_count(from)) {
396                 struct page *pages;
397                 size_t start;
398                 ssize_t copied;
399 
400                 copied = iov_iter_get_pages(from, &pages, PAGE_SIZE,
401                                             1, &start);
402                 if (copied < 0) {
403                         struct mmpin *mmp;
404                         int i;
405 
406                         for (i = 0; i < rm->data.op_nents; i++)
407                                 put_page(sg_page(&rm->data.op_sg[i]));
408                         mmp = &rm->data.op_mmp_znotifier->z_mmp;
409                         mm_unaccount_pinned_pages(mmp);
410                         ret = -EFAULT;
411                         goto err;
412                 }
413                 total_copied += copied;
414                 iov_iter_advance(from, copied);
415                 length -= copied;
416                 sg_set_page(sg, pages, copied, start);
417                 rm->data.op_nents++;
418                 sg++;
419         }
420         WARN_ON_ONCE(length != 0);
421         return ret;
422 err:
423         kfree(info);
424         rm->data.op_mmp_znotifier = NULL;
425         return ret;
426 }
427 
428 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
429                                bool zcopy)
430 {
431         unsigned long to_copy, nbytes;
432         unsigned long sg_off;
433         struct scatterlist *sg;
434         int ret = 0;
435 
436         rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
437 
438         /* now allocate and copy in the data payload.  */
439         sg = rm->data.op_sg;
440         sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
441 
442         if (zcopy)
443                 return rds_message_zcopy_from_user(rm, from);
444 
445         while (iov_iter_count(from)) {
446                 if (!sg_page(sg)) {
447                         ret = rds_page_remainder_alloc(sg, iov_iter_count(from),
448                                                        GFP_HIGHUSER);
449                         if (ret)
450                                 return ret;
451                         rm->data.op_nents++;
452                         sg_off = 0;
453                 }
454 
455                 to_copy = min_t(unsigned long, iov_iter_count(from),
456                                 sg->length - sg_off);
457 
458                 rds_stats_add(s_copy_from_user, to_copy);
459                 nbytes = copy_page_from_iter(sg_page(sg), sg->offset + sg_off,
460                                              to_copy, from);
461                 if (nbytes != to_copy)
462                         return -EFAULT;
463 
464                 sg_off += to_copy;
465 
466                 if (sg_off == sg->length)
467                         sg++;
468         }
469 
470         return ret;
471 }
472 
473 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to)
474 {
475         struct rds_message *rm;
476         struct scatterlist *sg;
477         unsigned long to_copy;
478         unsigned long vec_off;
479         int copied;
480         int ret;
481         u32 len;
482 
483         rm = container_of(inc, struct rds_message, m_inc);
484         len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
485 
486         sg = rm->data.op_sg;
487         vec_off = 0;
488         copied = 0;
489 
490         while (iov_iter_count(to) && copied < len) {
491                 to_copy = min_t(unsigned long, iov_iter_count(to),
492                                 sg->length - vec_off);
493                 to_copy = min_t(unsigned long, to_copy, len - copied);
494 
495                 rds_stats_add(s_copy_to_user, to_copy);
496                 ret = copy_page_to_iter(sg_page(sg), sg->offset + vec_off,
497                                         to_copy, to);
498                 if (ret != to_copy)
499                         return -EFAULT;
500 
501                 vec_off += to_copy;
502                 copied += to_copy;
503 
504                 if (vec_off == sg->length) {
505                         vec_off = 0;
506                         sg++;
507                 }
508         }
509 
510         return copied;
511 }
512 
513 /*
514  * If the message is still on the send queue, wait until the transport
515  * is done with it. This is particularly important for RDMA operations.
516  */
517 void rds_message_wait(struct rds_message *rm)
518 {
519         wait_event_interruptible(rm->m_flush_wait,
520                         !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
521 }
522 
523 void rds_message_unmapped(struct rds_message *rm)
524 {
525         clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
526         wake_up_interruptible(&rm->m_flush_wait);
527 }
528 EXPORT_SYMBOL_GPL(rds_message_unmapped);
529 

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