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41 #include <sys/queue.h>
43 #include <rte_common.h>
45 #include <rte_debug.h>
46 #include <rte_memory.h>
47 #include <rte_memzone.h>
48 #include <rte_atomic.h>
49 #include <rte_launch.h>
50 #include <rte_tailq.h>
52 #include <rte_eal_memconfig.h>
53 #include <rte_per_lcore.h>
54 #include <rte_lcore.h>
55 #include <rte_branch_prediction.h>
57 #include <rte_errno.h>
58 #include <rte_string_fns.h>
60 #include "rte_mempool.h"
62 TAILQ_HEAD(rte_mempool_list, rte_mempool);
64 #define CACHE_FLUSHTHRESH_MULTIPLIER 1.5
67 * return the greatest common divisor between a and b (fast algorithm)
70 static unsigned get_gcd(unsigned a, unsigned b)
95 * Depending on memory configuration, objects addresses are spreaded
96 * between channels and ranks in RAM: the pool allocator will add
97 * padding between objects. This function return the new size of the
100 static unsigned optimize_object_size(unsigned obj_size)
102 unsigned nrank, nchan;
103 unsigned new_obj_size;
105 /* get number of channels */
106 nchan = rte_memory_get_nchannel();
110 nrank = rte_memory_get_nrank();
114 /* process new object size */
115 new_obj_size = (obj_size + CACHE_LINE_MASK) / CACHE_LINE_SIZE;
116 while (get_gcd(new_obj_size, nrank * nchan) != 1 ||
117 get_gcd(nchan, new_obj_size) != 1)
119 return new_obj_size * CACHE_LINE_SIZE;
122 /* create the mempool */
124 rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
125 unsigned cache_size, unsigned private_data_size,
126 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
127 rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
128 int socket_id, unsigned flags)
130 char mz_name[RTE_MEMZONE_NAMESIZE];
131 char rg_name[RTE_RING_NAMESIZE];
132 struct rte_mempool *mp = NULL;
134 const struct rte_memzone *mz;
136 int mz_flags = RTE_MEMZONE_1GB|RTE_MEMZONE_SIZE_HINT_ONLY;
138 uint32_t header_size, trailer_size;
139 uint32_t total_elt_size;
143 /* compilation-time checks */
144 RTE_BUILD_BUG_ON((sizeof(struct rte_mempool) &
145 CACHE_LINE_MASK) != 0);
146 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
147 RTE_BUILD_BUG_ON((sizeof(struct rte_mempool_cache) &
148 CACHE_LINE_MASK) != 0);
149 RTE_BUILD_BUG_ON((offsetof(struct rte_mempool, local_cache) &
150 CACHE_LINE_MASK) != 0);
152 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
153 RTE_BUILD_BUG_ON((sizeof(struct rte_mempool_debug_stats) &
154 CACHE_LINE_MASK) != 0);
155 RTE_BUILD_BUG_ON((offsetof(struct rte_mempool, stats) &
156 CACHE_LINE_MASK) != 0);
159 /* check that we have an initialised tail queue */
160 if (RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_MEMPOOL, rte_mempool_list) == NULL) {
161 rte_errno = E_RTE_NO_TAILQ;
165 /* asked cache too big */
166 if (cache_size > RTE_MEMPOOL_CACHE_MAX_SIZE){
171 /* "no cache align" imply "no spread" */
172 if (flags & MEMPOOL_F_NO_CACHE_ALIGN)
173 flags |= MEMPOOL_F_NO_SPREAD;
176 if (flags & MEMPOOL_F_SP_PUT)
177 rg_flags |= RING_F_SP_ENQ;
178 if (flags & MEMPOOL_F_SC_GET)
179 rg_flags |= RING_F_SC_DEQ;
181 /* allocate the ring that will be used to store objects */
182 /* Ring functions will return appropriate errors if we are
183 * running as a secondary process etc., so no checks made
184 * in this function for that condition */
185 rte_snprintf(rg_name, sizeof(rg_name), "MP_%s", name);
186 r = rte_ring_create(rg_name, rte_align32pow2(n+1), socket_id, rg_flags);
191 * In header, we have at least the pointer to the pool, and
192 * optionaly a 64 bits cookie.
195 header_size += sizeof(struct rte_mempool *); /* ptr to pool */
196 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
197 header_size += sizeof(uint64_t); /* cookie */
199 if ((flags & MEMPOOL_F_NO_CACHE_ALIGN) == 0)
200 header_size = (header_size + CACHE_LINE_MASK) & (~CACHE_LINE_MASK);
202 /* trailer contains the cookie in debug mode */
204 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
205 trailer_size += sizeof(uint64_t); /* cookie */
207 /* element size is 8 bytes-aligned at least */
208 elt_size = (elt_size + 7) & (~7);
210 /* expand trailer to next cache line */
211 if ((flags & MEMPOOL_F_NO_CACHE_ALIGN) == 0) {
212 total_elt_size = header_size + elt_size + trailer_size;
213 trailer_size += ((CACHE_LINE_SIZE -
214 (total_elt_size & CACHE_LINE_MASK)) &
219 * increase trailer to add padding between objects in order to
220 * spread them accross memory channels/ranks
222 if ((flags & MEMPOOL_F_NO_SPREAD) == 0) {
224 new_size = optimize_object_size(header_size + elt_size +
226 trailer_size = new_size - header_size - elt_size;
229 /* this is the size of an object, including header and trailer */
230 total_elt_size = header_size + elt_size + trailer_size;
232 /* reserve a memory zone for this mempool: private data is
234 private_data_size = (private_data_size +
235 CACHE_LINE_MASK) & (~CACHE_LINE_MASK);
236 mempool_size = total_elt_size * n +
237 sizeof(struct rte_mempool) + private_data_size;
238 rte_snprintf(mz_name, sizeof(mz_name), "MP_%s", name);
239 mz = rte_memzone_reserve(mz_name, mempool_size, socket_id, mz_flags);
242 * no more memory: in this case we loose previously reserved
243 * space for the as we cannot free it
248 /* init the mempool structure */
250 memset(mp, 0, sizeof(*mp));
251 rte_snprintf(mp->name, sizeof(mp->name), "%s", name);
252 mp->phys_addr = mz->phys_addr;
256 mp->elt_size = elt_size;
257 mp->header_size = header_size;
258 mp->trailer_size = trailer_size;
259 mp->cache_size = cache_size;
260 mp->cache_flushthresh = (uint32_t)(cache_size * CACHE_FLUSHTHRESH_MULTIPLIER);
261 mp->private_data_size = private_data_size;
263 /* call the initializer */
265 mp_init(mp, mp_init_arg);
267 /* fill the headers and trailers, and add objects in ring */
268 obj = (char *)mp + sizeof(struct rte_mempool) + private_data_size;
269 for (i = 0; i < n; i++) {
270 struct rte_mempool **mpp;
271 obj = (char *)obj + header_size;
273 /* set mempool ptr in header */
274 mpp = __mempool_from_obj(obj);
277 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
278 __mempool_write_header_cookie(obj, 1);
279 __mempool_write_trailer_cookie(obj);
281 /* call the initializer */
283 obj_init(mp, obj_init_arg, obj, i);
285 /* enqueue in ring */
286 rte_ring_sp_enqueue(mp->ring, obj);
287 obj = (char *)obj + elt_size + trailer_size;
290 RTE_EAL_TAILQ_INSERT_TAIL(RTE_TAILQ_MEMPOOL, rte_mempool_list, mp);
295 /* Return the number of entries in the mempool */
297 rte_mempool_count(const struct rte_mempool *mp)
301 count = rte_ring_count(mp->ring);
303 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
306 if (mp->cache_size == 0)
309 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++)
310 count += mp->local_cache[lcore_id].len;
315 * due to race condition (access to len is not locked), the
316 * total can be greater than size... so fix the result
318 if (count > mp->size)
323 /* dump the cache status */
325 rte_mempool_dump_cache(const struct rte_mempool *mp)
327 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
330 unsigned cache_count;
332 printf(" cache infos:\n");
333 printf(" cache_size=%"PRIu32"\n", mp->cache_size);
334 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
335 cache_count = mp->local_cache[lcore_id].len;
336 printf(" cache_count[%u]=%u\n", lcore_id, cache_count);
337 count += cache_count;
339 printf(" total_cache_count=%u\n", count);
343 printf(" cache disabled\n");
348 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
349 /* check cookies before and after objects */
350 #ifndef __INTEL_COMPILER
351 #pragma GCC diagnostic ignored "-Wcast-qual"
354 mempool_audit_cookies(const struct rte_mempool *mp)
358 void * const *obj_table;
360 obj = (char *)mp + sizeof(struct rte_mempool) + mp->private_data_size;
361 for (i = 0; i < mp->size; i++) {
362 obj = (char *)obj + mp->header_size;
364 __mempool_check_cookies(mp, obj_table, 1, 2);
365 obj = (char *)obj + mp->elt_size + mp->trailer_size;
368 #ifndef __INTEL_COMPILER
369 #pragma GCC diagnostic error "-Wcast-qual"
372 #define mempool_audit_cookies(mp) do {} while(0)
375 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
376 /* check cookies before and after objects */
378 mempool_audit_cache(const struct rte_mempool *mp)
380 /* check cache size consistency */
382 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
383 if (mp->local_cache[lcore_id].len > mp->cache_flushthresh) {
384 RTE_LOG(CRIT, MEMPOOL, "badness on cache[%u]\n",
386 rte_panic("MEMPOOL: invalid cache len\n");
391 #define mempool_audit_cache(mp) do {} while(0)
395 /* check the consistency of mempool (size, cookies, ...) */
397 rte_mempool_audit(const struct rte_mempool *mp)
399 mempool_audit_cache(mp);
400 mempool_audit_cookies(mp);
403 /* dump the status of the mempool on the console */
405 rte_mempool_dump(const struct rte_mempool *mp)
407 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
408 struct rte_mempool_debug_stats sum;
411 unsigned common_count;
412 unsigned cache_count;
414 printf("mempool <%s>@%p\n", mp->name, mp);
415 printf(" flags=%x\n", mp->flags);
416 printf(" ring=<%s>@%p\n", mp->ring->name, mp->ring);
417 printf(" size=%"PRIu32"\n", mp->size);
418 printf(" header_size=%"PRIu32"\n", mp->header_size);
419 printf(" elt_size=%"PRIu32"\n", mp->elt_size);
420 printf(" trailer_size=%"PRIu32"\n", mp->trailer_size);
421 printf(" total_obj_size=%"PRIu32"\n",
422 mp->header_size + mp->elt_size + mp->trailer_size);
424 cache_count = rte_mempool_dump_cache(mp);
425 common_count = rte_ring_count(mp->ring);
426 if ((cache_count + common_count) > mp->size)
427 common_count = mp->size - cache_count;
428 printf(" common_pool_count=%u\n", common_count);
430 /* sum and dump statistics */
431 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
432 memset(&sum, 0, sizeof(sum));
433 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
434 sum.put_bulk += mp->stats[lcore_id].put_bulk;
435 sum.put_objs += mp->stats[lcore_id].put_objs;
436 sum.get_success_bulk += mp->stats[lcore_id].get_success_bulk;
437 sum.get_success_objs += mp->stats[lcore_id].get_success_objs;
438 sum.get_fail_bulk += mp->stats[lcore_id].get_fail_bulk;
439 sum.get_fail_objs += mp->stats[lcore_id].get_fail_objs;
442 printf(" put_bulk=%"PRIu64"\n", sum.put_bulk);
443 printf(" put_objs=%"PRIu64"\n", sum.put_objs);
444 printf(" get_success_bulk=%"PRIu64"\n", sum.get_success_bulk);
445 printf(" get_success_objs=%"PRIu64"\n", sum.get_success_objs);
446 printf(" get_fail_bulk=%"PRIu64"\n", sum.get_fail_bulk);
447 printf(" get_fail_objs=%"PRIu64"\n", sum.get_fail_objs);
449 printf(" no statistics available\n");
452 rte_mempool_audit(mp);
455 /* dump the status of all mempools on the console */
457 rte_mempool_list_dump(void)
459 const struct rte_mempool *mp = NULL;
460 struct rte_mempool_list *mempool_list;
463 RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_MEMPOOL, rte_mempool_list)) == NULL) {
464 rte_errno = E_RTE_NO_TAILQ;
468 TAILQ_FOREACH(mp, mempool_list, next) {
469 rte_mempool_dump(mp);
473 /* search a mempool from its name */
475 rte_mempool_lookup(const char *name)
477 struct rte_mempool *mp = NULL;
478 struct rte_mempool_list *mempool_list;
481 RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_MEMPOOL, rte_mempool_list)) == NULL) {
482 rte_errno = E_RTE_NO_TAILQ;
486 TAILQ_FOREACH(mp, mempool_list, next) {
487 if (strncmp(name, mp->name, RTE_MEMPOOL_NAMESIZE) == 0)