[dpdk-dev] [PATCH v2 3/6] mempool: detect physical contiguous object in pool

[Santosh Shukla]

The memory area containing all the objects must be physically
contiguous.
Introducing MEMPOOL_F_CAPA_PHYS_CONTIG flag for such use-case.

The flag useful to detect whether pool area has sufficient space
to fit all objects. If not then return -ENOSPC.
This way, we make sure that all object within a pool is contiguous.

Signed-off-by: Santosh Shukla <santosh.shukla at caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
v1 -- v2:
- Renamed flag to MEMPOOL_F_CAPA_PHYS_CONTIG
- Comment reworded.
Refer [1].
[1] http://dpdk.org/dev/patchwork/patch/25604/

 lib/librte_mempool/rte_mempool.c | 8 ++++++++
 lib/librte_mempool/rte_mempool.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 34619aafd..65a98c046 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -368,6 +368,14 @@ rte_mempool_populate_phys(struct rte_mempool *mp, char *vaddr,
 
 	total_elt_sz = mp->header_size + mp->elt_size + mp->trailer_size;
 
+	/* Detect pool area has sufficient space for elements */
+	if (mp->flags & MEMPOOL_F_CAPA_PHYS_CONTIG) {
+		if (len < total_elt_sz * mp->size) {
+			RTE_LOG(ERR, MEMPOOL, "pool area %" PRIx64 " not enough\n", len);
+			return -ENOSPC;
+		}
+	}
+
 	memhdr = rte_zmalloc("MEMPOOL_MEMHDR", sizeof(*memhdr), 0);
 	if (memhdr == NULL)
 		return -ENOMEM;
diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index 0fa571c72..ca5634eaf 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -265,6 +265,7 @@ struct rte_mempool {
 #define MEMPOOL_F_SC_GET         0x0008 /**< Default get is "single-consumer".*/
 #define MEMPOOL_F_POOL_CREATED   0x0010 /**< Internal: pool is created. */
 #define MEMPOOL_F_NO_PHYS_CONTIG 0x0020 /**< Don't need physically contiguous objs. */
+#define MEMPOOL_F_CAPA_PHYS_CONTIG 0x0040 /**< Detect physcially contiguous objs */
 
 /**
  * @internal When debug is enabled, store some statistics.
-- 
2.13.0