[dpdk-dev] [PATCH 1/5] mempool: allow unaligned addr/len in populate virt

[Olivier Matz <olivier.matz@6wind.com>]

rte_mempool_populate_virt() currently requires that both addr
and length are page-aligned.

Remove this uneeded constraint which can be annoying with big
hugepages (ex: 1GB).

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 lib/librte_mempool/rte_mempool.c | 18 +++++++-----------
 lib/librte_mempool/rte_mempool.h |  3 +--
 2 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 0f29e8712..76cbacdf3 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -368,17 +368,11 @@ rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
 	size_t off, phys_len;
 	int ret, cnt = 0;
 
-	/* address and len must be page-aligned */
-	if (RTE_PTR_ALIGN_CEIL(addr, pg_sz) != addr)
-		return -EINVAL;
-	if (RTE_ALIGN_CEIL(len, pg_sz) != len)
-		return -EINVAL;
-
 	if (mp->flags & MEMPOOL_F_NO_IOVA_CONTIG)
 		return rte_mempool_populate_iova(mp, addr, RTE_BAD_IOVA,
 			len, free_cb, opaque);
 
-	for (off = 0; off + pg_sz <= len &&
+	for (off = 0; off < len &&
 		     mp->populated_size < mp->size; off += phys_len) {
 
 		iova = rte_mem_virt2iova(addr + off);
@@ -389,7 +383,10 @@ rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
 		}
 
 		/* populate with the largest group of contiguous pages */
-		for (phys_len = pg_sz; off + phys_len < len; phys_len += pg_sz) {
+		for (phys_len = RTE_PTR_ALIGN_CEIL(addr + off + 1, pg_sz) -
+			     (addr + off);
+		     off + phys_len < len;
+		     phys_len = RTE_MIN(phys_len + pg_sz, len - off)) {
 			rte_iova_t iova_tmp;
 
 			iova_tmp = rte_mem_virt2iova(addr + off + phys_len);
@@ -575,8 +572,7 @@ rte_mempool_populate_default(struct rte_mempool *mp)
 			 * have
 			 */
 			mz = rte_memzone_reserve_aligned(mz_name, 0,
-					mp->socket_id, flags,
-					RTE_MAX(pg_sz, align));
+					mp->socket_id, flags, align);
 		}
 		if (mz == NULL) {
 			ret = -rte_errno;
@@ -601,7 +597,7 @@ rte_mempool_populate_default(struct rte_mempool *mp)
 				(void *)(uintptr_t)mz);
 		else
 			ret = rte_mempool_populate_virt(mp, mz->addr,
-				RTE_ALIGN_FLOOR(mz->len, pg_sz), pg_sz,
+				mz->len, pg_sz,
 				rte_mempool_memchunk_mz_free,
 				(void *)(uintptr_t)mz);
 		if (ret < 0) {
diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index 8053f7a04..0fe8aa7b8 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -1042,9 +1042,8 @@ int rte_mempool_populate_iova(struct rte_mempool *mp, char *vaddr,
  *   A pointer to the mempool structure.
  * @param addr
  *   The virtual address of memory that should be used to store objects.
- *   Must be page-aligned.
  * @param len
- *   The length of memory in bytes. Must be page-aligned.
+ *   The length of memory in bytes.
  * @param pg_sz
  *   The size of memory pages in this virtual area.
  * @param free_cb
-- 
2.20.1