Re: [dpdk-dev] [PATCH v3 5/6] 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.
> 
> Furthermore, do code clean up by moving repeated code inside
> 'test_ring_mem_cmp' function to validate data and print information of
> enqueue/dequeue elements if validation fails.
This patch is fixing 2 things. But only the memcmp issue need to be backported to stable. I would prefer to split this into 2 and mark only the memcmp commit to be backported.

Hi David,
	Do you have a different opinion here?

> 
> 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>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
> ---
>  app/test/test_ring.c | 59 ++++++++++++++++++++------------------------
>  1 file changed, 27 insertions(+), 32 deletions(-)
> 
> diff --git a/app/test/test_ring.c b/app/test/test_ring.c index
> 811adc523..4a2bd39fc 100644
> --- a/app/test/test_ring.c
> +++ b/app/test/test_ring.c
> @@ -258,6 +258,21 @@ test_ring_mem_init(void *obj, unsigned int count, int
> esize)
>  			((uint32_t *)obj)[i] = i;
>  }
> 
> +static int
> +test_ring_mem_cmp(void *src, void *dst, unsigned int size) {
> +	int ret;
> +
> +	ret = memcmp(src, dst, size);
> +	if (ret) {
> +		rte_hexdump(stdout, "src", src, size);
> +		rte_hexdump(stdout, "dst", dst, size);
> +		printf("data after dequeue is not the same\n");
> +	}
> +
> +	return ret;
> +}
> +
>  static void
>  test_ring_print_test_string(const char *istr, unsigned int api_type, int esize)
> { @@ -383,7 +398,7 @@ test_ring_burst_bulk_tests1(unsigned int test_idx)
>  	struct rte_ring *r;
>  	void **src = NULL, **cur_src = NULL, **dst = NULL, **cur_dst = NULL;
>  	int ret;
> -	unsigned int i, j;
> +	unsigned int i, j, temp_sz;
>  	int rand;
>  	const unsigned int rsz = RING_SIZE - 1;
> 
> @@ -444,7 +459,11 @@ 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);
> +			temp_sz = rsz * sizeof(void *);
> +			if (esize[i] != -1)
> +				temp_sz = rsz * esize[i];
> +			TEST_RING_VERIFY(test_ring_mem_cmp(src, dst,
> +						temp_sz) == 0);
>  		}
> 
>  		/* Free memory before test completed */ @@ -538,12 +557,8
> @@ 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);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_dst, dst)))
>  			goto fail;
> -		}
> 
>  		/* Free memory before test completed */
>  		rte_ring_free(r);
> @@ -614,12 +629,8 @@ 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);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_dst, dst)))
>  			goto fail;
> -		}
> 
>  		/* Free memory before test completed */
>  		rte_ring_free(r);
> @@ -747,12 +758,8 @@ 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);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_dst, dst)))
>  			goto fail;
> -		}
> 
>  		/* Free memory before test completed */
>  		rte_ring_free(r);
> @@ -857,12 +864,8 @@ test_ring_basic_ex(void)
>  		}
> 
>  		/* check data */
> -		if (memcmp(src, dst, cur_src - src)) {
> -			rte_hexdump(stdout, "src", src, cur_src - src);
> -			rte_hexdump(stdout, "dst", dst, cur_dst - dst);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_src, src)))
>  			goto fail_test;
> -		}
> 
>  		/* Following tests use the configured flags to decide
>  		 * SP/SC or MP/MC.
> @@ -909,12 +912,8 @@ test_ring_basic_ex(void)
>  		cur_dst = test_ring_inc_ptr(cur_dst, esize[i], 2);
> 
>  		/* 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);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_dst, dst)))
>  			goto fail_test;
> -		}
> 
>  		rte_ring_free(rp);
>  		rte_free(src);
> @@ -1047,12 +1046,8 @@ test_ring_with_exact_size(void)
>  		}
> 
>  		/* 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);
> -			printf("data after dequeue is not the same\n");
> +		if (test_ring_mem_cmp(src, dst, RTE_PTR_DIFF(cur_dst, dst)))
>  			goto test_fail;
> -		}
> 
>  		rte_free(src_orig);
>  		rte_free(dst_orig);
> --
> 2.17.1