mempool: fix alignment of memzone length when populating

When populating a mempool with the default function, if there is not
enough virtually contiguous memory for the whole mempool, it will be
populated with several chunks. A chunk of the maximum available length
is requested with:

  mz = rte_memzone_reserve_aligned(..., len=0, ..., align=x)

If align is smaller than the page size, the address and the length of
the memzone may not be a multiple of the page size. This makes
rte_mempool_populate_virt() to fail because it requires them to be
page-aligned. This patch fixes that.

The problem can be reproduced easily by allocating more than available
memory:
  ./build/app/testpmd -l 0,1 -- --total-num-mbufs=65536
  ...
  Cause: Creation of mbuf pool for socket 0 failed: Invalid argument

After the patch, the error code is correct:
  ./build/app/testpmd -l 0,1 -- --total-num-mbufs=65536
  ...
  Cause: Creation of mbuf pool for socket 0 failed: Cannot allocate memory

Fixes: ba0009560c30 ("mempool: support new allocation methods")

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index cf5d124..9f1a425 100644 (file)
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -684,7 +684,8 @@ rte_mempool_populate_default(struct rte_mempool *mp)
                         * have
                         */
                        mz = rte_memzone_reserve_aligned(mz_name, 0,
-                                       mp->socket_id, flags, align);
+                                       mp->socket_id, flags,
+                                       RTE_MAX(pg_sz, align));
                }
                if (mz == NULL) {
                        ret = -rte_errno;
@@ -709,7 +710,7 @@ rte_mempool_populate_default(struct rte_mempool *mp)
                                (void *)(uintptr_t)mz);
                else
                        ret = rte_mempool_populate_virt(mp, mz->addr,
-                               mz->len, pg_sz,
+                               RTE_ALIGN_FLOOR(mz->len, pg_sz), pg_sz,
                                rte_mempool_memchunk_mz_free,
                                (void *)(uintptr_t)mz);
                if (ret < 0) {