4 * Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 * Derived from FreeBSD's bufring.c
37 **************************************************************************
39 * Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
40 * All rights reserved.
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions are met:
45 * 1. Redistributions of source code must retain the above copyright notice,
46 * this list of conditions and the following disclaimer.
48 * 2. The name of Kip Macy nor the names of other
49 * contributors may be used to endorse or promote products derived from
50 * this software without specific prior written permission.
52 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
53 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
56 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
57 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
58 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
59 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
60 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
61 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
62 * POSSIBILITY OF SUCH DAMAGE.
64 ***************************************************************************/
72 #include <sys/queue.h>
74 #include <rte_common.h>
76 #include <rte_memory.h>
77 #include <rte_memzone.h>
78 #include <rte_malloc.h>
79 #include <rte_launch.h>
81 #include <rte_eal_memconfig.h>
82 #include <rte_atomic.h>
83 #include <rte_per_lcore.h>
84 #include <rte_lcore.h>
85 #include <rte_branch_prediction.h>
86 #include <rte_errno.h>
87 #include <rte_string_fns.h>
88 #include <rte_spinlock.h>
92 TAILQ_HEAD(rte_ring_list, rte_tailq_entry);
94 static struct rte_tailq_elem rte_ring_tailq = {
95 .name = RTE_TAILQ_RING_NAME,
97 EAL_REGISTER_TAILQ(rte_ring_tailq)
99 /* true if x is a power of 2 */
100 #define POWEROF2(x) ((((x)-1) & (x)) == 0)
102 /* return the size of memory occupied by a ring */
104 rte_ring_get_memsize(unsigned count)
108 /* count must be a power of 2 */
109 if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK )) {
111 "Requested size is invalid, must be power of 2, and "
112 "do not exceed the size limit %u\n", RTE_RING_SZ_MASK);
116 sz = sizeof(struct rte_ring) + count * sizeof(void *);
117 sz = RTE_ALIGN(sz, RTE_CACHE_LINE_SIZE);
122 rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
127 /* compilation-time checks */
128 RTE_BUILD_BUG_ON((sizeof(struct rte_ring) &
129 RTE_CACHE_LINE_MASK) != 0);
130 RTE_BUILD_BUG_ON((offsetof(struct rte_ring, cons) &
131 RTE_CACHE_LINE_MASK) != 0);
132 RTE_BUILD_BUG_ON((offsetof(struct rte_ring, prod) &
133 RTE_CACHE_LINE_MASK) != 0);
135 /* init the ring structure */
136 memset(r, 0, sizeof(*r));
137 ret = snprintf(r->name, sizeof(r->name), "%s", name);
138 if (ret < 0 || ret >= (int)sizeof(r->name))
139 return -ENAMETOOLONG;
141 r->prod.single = (flags & RING_F_SP_ENQ) ? __IS_SP : __IS_MP;
142 r->cons.single = (flags & RING_F_SC_DEQ) ? __IS_SC : __IS_MC;
144 if (flags & RING_F_EXACT_SZ) {
145 r->size = rte_align32pow2(count + 1);
146 r->mask = r->size - 1;
149 if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK)) {
151 "Requested size is invalid, must be power of 2, and not exceed the size limit %u\n",
157 r->capacity = r->mask;
159 r->prod.head = r->cons.head = 0;
160 r->prod.tail = r->cons.tail = 0;
165 /* create the ring */
167 rte_ring_create(const char *name, unsigned count, int socket_id,
170 char mz_name[RTE_MEMZONE_NAMESIZE];
172 struct rte_tailq_entry *te;
173 const struct rte_memzone *mz;
176 struct rte_ring_list* ring_list = NULL;
177 const unsigned int requested_count = count;
180 ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
182 /* for an exact size ring, round up from count to a power of two */
183 if (flags & RING_F_EXACT_SZ)
184 count = rte_align32pow2(count + 1);
186 ring_size = rte_ring_get_memsize(count);
188 rte_errno = ring_size;
192 ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
193 RTE_RING_MZ_PREFIX, name);
194 if (ret < 0 || ret >= (int)sizeof(mz_name)) {
195 rte_errno = ENAMETOOLONG;
199 te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
201 RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
206 rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
208 /* reserve a memory zone for this ring. If we can't get rte_config or
209 * we are secondary process, the memzone_reserve function will set
210 * rte_errno for us appropriately - hence no check in this this function */
211 mz = rte_memzone_reserve_aligned(mz_name, ring_size, socket_id,
212 mz_flags, __alignof__(*r));
215 /* no need to check return value here, we already checked the
217 rte_ring_init(r, name, requested_count, flags);
219 te->data = (void *) r;
222 TAILQ_INSERT_TAIL(ring_list, te, next);
225 RTE_LOG(ERR, RING, "Cannot reserve memory\n");
228 rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
235 rte_ring_free(struct rte_ring *r)
237 struct rte_ring_list *ring_list = NULL;
238 struct rte_tailq_entry *te;
244 * Ring was not created with rte_ring_create,
245 * therefore, there is no memzone to free.
247 if (r->memzone == NULL) {
248 RTE_LOG(ERR, RING, "Cannot free ring (not created with rte_ring_create()");
252 if (rte_memzone_free(r->memzone) != 0) {
253 RTE_LOG(ERR, RING, "Cannot free memory\n");
257 ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
258 rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
260 /* find out tailq entry */
261 TAILQ_FOREACH(te, ring_list, next) {
262 if (te->data == (void *) r)
267 rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
271 TAILQ_REMOVE(ring_list, te, next);
273 rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
278 /* dump the status of the ring on the console */
280 rte_ring_dump(FILE *f, const struct rte_ring *r)
282 fprintf(f, "ring <%s>@%p\n", r->name, r);
283 fprintf(f, " flags=%x\n", r->flags);
284 fprintf(f, " size=%"PRIu32"\n", r->size);
285 fprintf(f, " capacity=%"PRIu32"\n", r->capacity);
286 fprintf(f, " ct=%"PRIu32"\n", r->cons.tail);
287 fprintf(f, " ch=%"PRIu32"\n", r->cons.head);
288 fprintf(f, " pt=%"PRIu32"\n", r->prod.tail);
289 fprintf(f, " ph=%"PRIu32"\n", r->prod.head);
290 fprintf(f, " used=%u\n", rte_ring_count(r));
291 fprintf(f, " avail=%u\n", rte_ring_free_count(r));
294 /* dump the status of all rings on the console */
296 rte_ring_list_dump(FILE *f)
298 const struct rte_tailq_entry *te;
299 struct rte_ring_list *ring_list;
301 ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
303 rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
305 TAILQ_FOREACH(te, ring_list, next) {
306 rte_ring_dump(f, (struct rte_ring *) te->data);
309 rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
312 /* search a ring from its name */
314 rte_ring_lookup(const char *name)
316 struct rte_tailq_entry *te;
317 struct rte_ring *r = NULL;
318 struct rte_ring_list *ring_list;
320 ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
322 rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
324 TAILQ_FOREACH(te, ring_list, next) {
325 r = (struct rte_ring *) te->data;
326 if (strncmp(name, r->name, RTE_RING_NAMESIZE) == 0)
330 rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);