Re: [PATCH] app/test: fix reorder test failure

["Hunt, David" <david.hunt@intel.com>]

Hi Reshma,

On 3/5/2018 4:42 PM, Reshma Pattan wrote:
> Inside test_reorder_insert()
> rte_mempool_get_bulk() and rte_mempool_put_bulk() are used
> to allocate and free the mbufs and then rte_reorder_free()
> is called which again freeing the mbufs using rte_pktmbuf_free().
>
> The mixed use of rte_mempool_put_bulk() and rte_pktmbuf_free()
> causing duplicate mbufs to be created when rte_mempool_get_bulk()
> is called next in test_reorder_drain().
>
> Since reorder library is taking care of freeing the mbufs
> using rte_pktmbuf_free() change UT to allocate mbufs using
> rte_pktmbuf_alloc().
>
> Do not mix and match the bulk get/put APIs with
> alloc/free APIs which can cause undefined behavior.
>
> Fixes: d0c9b58d71 ("app/test: new reorder unit test")
> Cc: stable@dpdk.org
> Cc: david.hunt@intel.com
> Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
> ---
>   test/test/test_reorder.c | 18 ++++++++----------
>   1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/test/test/test_reorder.c b/test/test/test_reorder.c
> index 65e4f38b2..b79b00961 100644
> --- a/test/test/test_reorder.c
> +++ b/test/test/test_reorder.c
> @@ -146,11 +146,11 @@ test_reorder_insert(void)
>   	b = rte_reorder_create("test_insert", rte_socket_id(), size);
>   	TEST_ASSERT_NOT_NULL(b, "Failed to create reorder buffer");
>   
> -	ret = rte_mempool_get_bulk(p, (void *)bufs, num_bufs);
> -	TEST_ASSERT_SUCCESS(ret, "Error getting mbuf from pool");
> -
> -	for (i = 0; i < num_bufs; i++)
> +	for (i = 0; i < num_bufs; i++) {
> +		bufs[i] = rte_pktmbuf_alloc(p);
> +		TEST_ASSERT_NOT_NULL(bufs[i], "Packet allocation failed\n");
>   		bufs[i]->seqn = i;
> +	}
>   
>   	/* This should fill up order buffer:
>   	 * reorder_seq = 0
> @@ -202,7 +202,6 @@ test_reorder_insert(void)
>   
>   	ret = 0;
>   exit:
> -	rte_mempool_put_bulk(p, (void *)bufs, num_bufs);
>   	rte_reorder_free(b);
>   	return ret;
>   }
> @@ -227,9 +226,6 @@ test_reorder_drain(void)
>   	b = rte_reorder_create("test_drain", rte_socket_id(), size);
>   	TEST_ASSERT_NOT_NULL(b, "Failed to create reorder buffer");
>   
> -	ret = rte_mempool_get_bulk(p, (void *)bufs, num_bufs);
> -	TEST_ASSERT_SUCCESS(ret, "Error getting mbuf from pool");
> -
>   	/* Check no drained packets if reorder is empty */
>   	cnt = rte_reorder_drain(b, robufs, 1);
>   	if (cnt != 0) {
> @@ -239,8 +235,11 @@ test_reorder_drain(void)
>   		goto exit;
>   	}
>   
> -	for (i = 0; i < num_bufs; i++)
> +	for (i = 0; i < num_bufs; i++) {
> +		bufs[i] = rte_pktmbuf_alloc(p);
> +		TEST_ASSERT_NOT_NULL(bufs[i], "Packet allocation failed\n");
>   		bufs[i]->seqn = i;
> +	}
>   
>   	/* Insert packet with seqn 1:
>   	 * reorder_seq = 0
> @@ -298,7 +297,6 @@ test_reorder_drain(void)
>   	}
>   	ret = 0;
>   exit:
> -	rte_mempool_put_bulk(p, (void *)bufs, num_bufs);
>   	rte_reorder_free(b);
>   	return ret;
>   }

I have one question. While the rte_reorder_free() takes care of freeing
up any mbufs that were inserted into the reorder buffer, should there
be rte_pktmbuf_free() calls for any remaining unused mbufs left in the
bufs[] array?

Regards,
Dave.