Re: [dpdk-stable] [PATCH v2 2/4] test/ring: fix wrong size used in memcmp

[Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>]

<snip>

> 
> When using memcmp function to check data, the third param should be the
> size of all elements, rather than the number of the elements.
> 
> Fixes: a9fe152363e2 ("test/ring: add custom element size functional tests")
> Cc: honnappa.nagarahalli@arm.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> ---
>  app/test/test_ring.c | 31 +++++++++++++++++++++----------
>  1 file changed, 21 insertions(+), 10 deletions(-)
> 
> diff --git a/app/test/test_ring.c b/app/test/test_ring.c index
> 0ae97d341..c508a13a9 100644
> --- a/app/test/test_ring.c
> +++ b/app/test/test_ring.c
> @@ -444,7 +444,12 @@ test_ring_burst_bulk_tests1(unsigned int test_idx)
>  			TEST_RING_VERIFY(rte_ring_empty(r));
> 
>  			/* check data */
> -			TEST_RING_VERIFY(memcmp(src, dst, rsz) == 0);
> +			if (esize[i] == -1) {
> +				TEST_RING_VERIFY(memcmp(src, dst,
> +					rsz * sizeof(void *)) == 0);
> +			} else
> +				TEST_RING_VERIFY(memcmp(src, dst,
> +					rsz * esize[i]) == 0);
Can you implement a function similar to 'test_ring_mem_init' to do this comparison?

>  		}
> 
>  		/* Free memory before test completed */ @@ -538,9 +543,11
> @@ test_ring_burst_bulk_tests2(unsigned int test_idx)
>  		cur_dst = test_ring_inc_ptr(cur_dst, esize[i], MAX_BULK);
> 
>  		/* check data */
> -		if (memcmp(src, dst, cur_dst - dst)) {
> -			rte_hexdump(stdout, "src", src, cur_src - src);
> -			rte_hexdump(stdout, "dst", dst, cur_dst - dst);
> +		if (memcmp(src, dst, RTE_PTR_DIFF(cur_dst, dst))) {
> +			rte_hexdump(stdout, "src", src,
> +					RTE_PTR_DIFF(cur_src, src));
> +			rte_hexdump(stdout, "dst", dst,
> +					RTE_PTR_DIFF(cur_dst, dst));
I do not think, this change and the rest below are bug fixes. Can you please separate them into another commit?

>  			printf("data after dequeue is not the same\n");
>  			goto fail;
>  		}
> @@ -614,9 +621,11 @@ test_ring_burst_bulk_tests3(unsigned int test_idx)
>  		}
> 
>  		/* check data */
> -		if (memcmp(src, dst, cur_dst - dst)) {
> -			rte_hexdump(stdout, "src", src, cur_src - src);
> -			rte_hexdump(stdout, "dst", dst, cur_dst - dst);
> +		if (memcmp(src, dst, RTE_PTR_DIFF(cur_dst, dst))) {
> +			rte_hexdump(stdout, "src", src,
> +					RTE_PTR_DIFF(cur_src, src));
> +			rte_hexdump(stdout, "dst", dst,
> +					RTE_PTR_DIFF(cur_dst, dst));
>  			printf("data after dequeue is not the same\n");
>  			goto fail;
>  		}
> @@ -747,9 +756,11 @@ test_ring_burst_bulk_tests4(unsigned int test_idx)
>  			goto fail;
> 
>  		/* check data */
> -		if (memcmp(src, dst, cur_dst - dst)) {
> -			rte_hexdump(stdout, "src", src, cur_src - src);
> -			rte_hexdump(stdout, "dst", dst, cur_dst - dst);
> +		if (memcmp(src, dst, RTE_PTR_DIFF(cur_dst, dst))) {
> +			rte_hexdump(stdout, "src", src,
> +					RTE_PTR_DIFF(cur_src, src));
> +			rte_hexdump(stdout, "dst", dst,
> +					RTE_PTR_DIFF(cur_dst, dst));
>  			printf("data after dequeue is not the same\n");
>  			goto fail;
>  		}
> --
> 2.17.1