[dpdk-dev] [PATCH v1 13/15] mempool: add support to non-EAL thread

[Cunming Liang <cunming.liang@intel.com>]

For non-EAL thread, bypass per lcore cache, directly use ring pool.
It allows using rte_mempool in either EAL thread or any user pthread.
As in non-EAL thread, it directly rely on rte_ring and it's none preemptive.
It doesn't suggest to run multi-pthread/cpu which compete the rte_mempool.
It will get bad performance and has critical risk if scheduling policy is RT.

Signed-off-by: Cunming Liang <cunming.liang@intel.com>
---
 lib/librte_mempool/rte_mempool.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index 3314651..4845f27 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -198,10 +198,12 @@ struct rte_mempool {
  *   Number to add to the object-oriented statistics.
  */
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
-#define __MEMPOOL_STAT_ADD(mp, name, n) do {			\
-		unsigned __lcore_id = rte_lcore_id();		\
-		mp->stats[__lcore_id].name##_objs += n;		\
-		mp->stats[__lcore_id].name##_bulk += 1;		\
+#define __MEMPOOL_STAT_ADD(mp, name, n) do {                    \
+		unsigned __lcore_id = rte_lcore_id();           \
+		if (__lcore_id < RTE_MAX_LCORE) {               \
+			mp->stats[__lcore_id].name##_objs += n;	\
+			mp->stats[__lcore_id].name##_bulk += 1;	\
+		}                                               \
 	} while(0)
 #else
 #define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
@@ -767,8 +769,9 @@ __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
 	__MEMPOOL_STAT_ADD(mp, put, n);
 
 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
-	/* cache is not enabled or single producer */
-	if (unlikely(cache_size == 0 || is_mp == 0))
+	/* cache is not enabled or single producer or none EAL thread */
+	if (unlikely(cache_size == 0 || is_mp == 0 ||
+		     lcore_id >= RTE_MAX_LCORE))
 		goto ring_enqueue;
 
 	/* Go straight to ring if put would overflow mem allocated for cache */
@@ -952,7 +955,8 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
 	uint32_t cache_size = mp->cache_size;
 
 	/* cache is not enabled or single consumer */
-	if (unlikely(cache_size == 0 || is_mc == 0 || n >= cache_size))
+	if (unlikely(cache_size == 0 || is_mc == 0 ||
+		     n >= cache_size || lcore_id >= RTE_MAX_LCORE))
 		goto ring_dequeue;
 
 	cache = &mp->local_cache[lcore_id];
-- 
1.8.1.4