[dpdk-dev] [PATCH 2/4] mempool: make cache flush threshold macro public

[Robert Sanford]

Rename macros that calculate a mempool cache flush threshold, and
move them from rte_mempool.c to rte_mempool.h, so that the bonding
driver can accurately calculate its mbuf requirements.

Signed-off-by: Robert Sanford <rsanford at akamai.com>
---
 lib/librte_mempool/rte_mempool.c |    8 ++------
 lib/librte_mempool/rte_mempool.h |    7 +++++++
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 2e28e2e..cca4843 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -69,10 +69,6 @@ static struct rte_tailq_elem rte_mempool_tailq = {
 };
 EAL_REGISTER_TAILQ(rte_mempool_tailq)

-#define CACHE_FLUSHTHRESH_MULTIPLIER 1.5
-#define CALC_CACHE_FLUSHTHRESH(c)      \
-       ((typeof(c))((c) * CACHE_FLUSHTHRESH_MULTIPLIER))
-
 /*
  * return the greatest common divisor between a and b (fast algorithm)
  *
@@ -686,7 +682,7 @@ static void
 mempool_cache_init(struct rte_mempool_cache *cache, uint32_t size)
 {
        cache->size = size;
-       cache->flushthresh = CALC_CACHE_FLUSHTHRESH(size);
+       cache->flushthresh = RTE_MEMPOOL_CALC_CACHE_FLUSHTHRESH(size);
        cache->len = 0;
 }

@@ -762,7 +758,7 @@ rte_mempool_create_empty(const char *name, unsigned n, 
unsigned elt_size,

        /* asked cache too big */
        if (cache_size > RTE_MEMPOOL_CACHE_MAX_SIZE ||
-           CALC_CACHE_FLUSHTHRESH(cache_size) > n) {
+           RTE_MEMPOOL_CALC_CACHE_FLUSHTHRESH(cache_size) > n) {
                rte_errno = EINVAL;
                return NULL;
        }
diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index 059ad9e..4323c1b 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -263,6 +263,13 @@ struct rte_mempool {
 #define MEMPOOL_F_NO_PHYS_CONTIG 0x0020 /**< Don't need physically contiguous 
objs. */

 /**
+ * Calculate the threshold before we flush excess elements.
+ */
+#define RTE_MEMPOOL_CACHE_FLUSHTHRESH_MULTIPLIER 1.5
+#define RTE_MEMPOOL_CALC_CACHE_FLUSHTHRESH(c)  \
+       ((typeof(c))((c) * RTE_MEMPOOL_CACHE_FLUSHTHRESH_MULTIPLIER))
+
+/**
  * @internal When debug is enabled, store some statistics.
  *
  * @param mp
-- 
1.7.1