Hi Feifei,
        Can you add this at the head of the series? It will help with proving 
that the test case fails and hence we need subsequent fixes.

> -----Original Message-----
> From: Feifei Wang <feifei.wa...@arm.com>
> Sent: Wednesday, August 5, 2020 1:14 AM
> To: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>; Konstantin
> Ananyev <konstantin.anan...@intel.com>
> Cc: dev@dpdk.org; nd <n...@arm.com>; Feifei Wang <feifei.wa...@arm.com>
> Subject: [PATCH v2 4/4] test/ring: add check to validate the dequeued objects
> 
> For the single element enqueue and dequeue in test_ring_basic_ex and
> test_ring_with_exact_size, add check to validate the dequeued objects.
> 
> Signed-off-by: Feifei Wang <feifei.wa...@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>
> ---
>  app/test/test_ring.c | 145 ++++++++++++++++++++++++++++++++-----------
>  1 file changed, 109 insertions(+), 36 deletions(-)
> 
> diff --git a/app/test/test_ring.c b/app/test/test_ring.c index
> 51bae0d48..a1ff73a05 100644
> --- a/app/test/test_ring.c
> +++ b/app/test/test_ring.c
> @@ -791,15 +791,9 @@ test_ring_basic_ex(void)
>       int ret = -1;
>       unsigned int i, j;
>       struct rte_ring *rp = NULL;
> -     void *obj = NULL;
> +     void **src = NULL, **cur_src = NULL, **dst = NULL, **cur_dst = NULL;
> 
>       for (i = 0; i < RTE_DIM(esize); i++) {
> -             obj = test_ring_calloc(RING_SIZE, esize[i]);
> -             if (obj == NULL) {
> -                     printf("%s: failed to alloc memory\n", __func__);
> -                     goto fail_test;
> -             }
> -
>               rp = test_ring_create("test_ring_basic_ex", esize[i], RING_SIZE,
>                                       SOCKET_ID_ANY,
>                                       RING_F_SP_ENQ | RING_F_SC_DEQ);
> @@ -808,6 +802,23 @@ test_ring_basic_ex(void)
>                       goto fail_test;
>               }
> 
> +             /* alloc dummy object pointers */
> +             src = test_ring_calloc(RING_SIZE, esize[i]);
> +             if (src == NULL) {
> +                     printf("%s: failed to alloc src memory\n", __func__);
> +                     goto fail_test;
> +             }
> +             test_ring_mem_init(src, RING_SIZE, esize[i]);
> +             cur_src = src;
> +
> +             /* alloc some room for copied objects */
> +             dst = test_ring_calloc(RING_SIZE, esize[i]);
> +             if (dst == NULL) {
> +                     printf("%s: failed to alloc dst memory\n", __func__);
> +                     goto fail_test;
> +             }
> +             cur_dst = dst;
> +
>               if (rte_ring_lookup("test_ring_basic_ex") != rp) {
>                       printf("%s: failed to find ring\n", __func__);
>                       goto fail_test;
> @@ -823,8 +834,9 @@ test_ring_basic_ex(void)
>                       rte_ring_free_count(rp));
> 
>               for (j = 0; j < RING_SIZE - 1; j++) {
> -                     test_ring_enqueue(rp, obj, esize[i], 1,
> +                     test_ring_enqueue(rp, cur_src, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
> +                     cur_src = test_ring_inc_ptr(cur_src, esize[i], 1);
>               }
> 
>               if (rte_ring_full(rp) != 1) {
> @@ -834,8 +846,9 @@ test_ring_basic_ex(void)
>               }
> 
>               for (j = 0; j < RING_SIZE - 1; j++) {
> -                     test_ring_dequeue(rp, obj, esize[i], 1,
> +                     test_ring_dequeue(rp, cur_dst, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
> +                     cur_dst = test_ring_inc_ptr(cur_dst, esize[i], 1);
>               }
> 
>               if (rte_ring_empty(rp) != 1) {
> @@ -844,52 +857,88 @@ test_ring_basic_ex(void)
>                       goto fail_test;
>               }
> 
> +             /* check data */
> +             if (memcmp(src, dst, RTE_PTR_DIFF(cur_src, src))) {
> +                     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_test;
> +             }
> +
> +
>               /* Following tests use the configured flags to decide
>                * SP/SC or MP/MC.
>                */
> +             /* reset dst */
> +             if (esize[i] == -1)
> +                     memset(dst, 0, RING_SIZE * sizeof(void *));
> +             else
> +                     memset(dst, 0, RING_SIZE * esize[i]);
Can you convert the above into a function like 'test_ring_mem_reset'?

> +
> +             /* reset cur_src and cur_dst */
> +             cur_src = src;
> +             cur_dst = dst;
> +
>               /* Covering the ring burst operation */
> -             ret = test_ring_enqueue(rp, obj, esize[i], 2,
> +             ret = test_ring_enqueue(rp, cur_src, esize[i], 2,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_BURST);
>               if (ret != 2) {
>                       printf("%s: rte_ring_enqueue_burst fails\n", __func__);
>                       goto fail_test;
>               }
> +             cur_src = test_ring_inc_ptr(cur_src, esize[i], 2);
> 
> -             ret = test_ring_dequeue(rp, obj, esize[i], 2,
> +             ret = test_ring_dequeue(rp, cur_dst, esize[i], 2,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_BURST);
>               if (ret != 2) {
>                       printf("%s: rte_ring_dequeue_burst fails\n", __func__);
>                       goto fail_test;
>               }
> +             cur_dst = test_ring_inc_ptr(cur_dst, esize[i], 2);
> 
>               /* Covering the ring bulk operation */
> -             ret = test_ring_enqueue(rp, obj, esize[i], 2,
> +             ret = test_ring_enqueue(rp, cur_src, esize[i], 2,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_BULK);
>               if (ret != 2) {
>                       printf("%s: rte_ring_enqueue_bulk fails\n", __func__);
>                       goto fail_test;
>               }
> +             cur_src = test_ring_inc_ptr(cur_src, esize[i], 2);
> 
> -             ret = test_ring_dequeue(rp, obj, esize[i], 2,
> +             ret = test_ring_dequeue(rp, cur_dst, esize[i], 2,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_BULK);
>               if (ret != 2) {
>                       printf("%s: rte_ring_dequeue_bulk fails\n", __func__);
>                       goto fail_test;
>               }
> +             cur_dst = test_ring_inc_ptr(cur_dst, esize[i], 2);
> +
> +             /* check data */
> +             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_test;
> +             }
> 
>               rte_ring_free(rp);
> -             rte_free(obj);
> +             rte_free(src);
> +             rte_free(dst);
>               rp = NULL;
> -             obj = NULL;
> +             src = NULL;
> +             dst = NULL;
>       }
> 
>       return 0;
> 
>  fail_test:
>       rte_ring_free(rp);
> -     if (obj != NULL)
> -             rte_free(obj);
> -
> +     rte_free(src);
> +     rte_free(dst);
>       return -1;
>  }
> 
> @@ -900,8 +949,8 @@ static int
>  test_ring_with_exact_size(void)
>  {
>       struct rte_ring *std_r = NULL, *exact_sz_r = NULL;
> -     void *obj_orig;
> -     void *obj;
> +     void **src_orig = NULL, **dst_orig = NULL;
> +     void **src = NULL, **cur_src = NULL, **dst = NULL, **cur_dst = NULL;
>       const unsigned int ring_sz = 16;
>       unsigned int i, j;
>       int ret = -1;
> @@ -911,14 +960,6 @@ test_ring_with_exact_size(void)
>                               TEST_RING_IGNORE_API_TYPE,
>                               esize[i]);
> 
> -             /* alloc object pointers. Allocate one extra object
> -              * and create an unaligned address.
> -              */
> -             obj_orig = test_ring_calloc(17, esize[i]);
> -             if (obj_orig == NULL)
> -                     goto test_fail;
> -             obj = ((char *)obj_orig) + 1;
> -
>               std_r = test_ring_create("std", esize[i], ring_sz,
>                                       rte_socket_id(),
>                                       RING_F_SP_ENQ | RING_F_SC_DEQ);
> @@ -936,6 +977,22 @@ test_ring_with_exact_size(void)
>                       goto test_fail;
>               }
> 
> +             /* alloc object pointers. Allocate one extra object
> +              * and create an unaligned address.
> +              */
> +             src_orig = test_ring_calloc(17, esize[i]);
> +             if (src_orig == NULL)
> +                     goto test_fail;
> +             test_ring_mem_init(src_orig, 17, esize[i]);
> +             src = ((void **)src_orig) + 1;
                                         ^^^^^^ This does not create an 
unaligned address. You have to use the typecasting to 'char *' like in the 
original code.

> +             cur_src = src;
> +
> +             dst_orig = test_ring_calloc(17, esize[i]);
> +             if (dst_orig == NULL)
> +                     goto test_fail;
> +             dst = ((void **)dst_orig) + 1;
Same here.

> +             cur_dst = dst;
> +
>               /*
>                * Check that the exact size ring is bigger than the
>                * standard ring
> @@ -952,33 +1009,36 @@ test_ring_with_exact_size(void)
>                * than the standard ring. (16 vs 15 elements)
>                */
>               for (j = 0; j < ring_sz - 1; j++) {
> -                     test_ring_enqueue(std_r, obj, esize[i], 1,
> +                     test_ring_enqueue(std_r, cur_src, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
> -                     test_ring_enqueue(exact_sz_r, obj, esize[i], 1,
> +                     test_ring_enqueue(exact_sz_r, cur_src, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
> +                     cur_src = test_ring_inc_ptr(cur_src, esize[i], 1);
>               }
> -             ret = test_ring_enqueue(std_r, obj, esize[i], 1,
> +             ret = test_ring_enqueue(std_r, cur_src, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
>               if (ret != -ENOBUFS) {
>                       printf("%s: error, unexpected successful enqueue\n",
>                               __func__);
>                       goto test_fail;
>               }
> -             ret = test_ring_enqueue(exact_sz_r, obj, esize[i], 1,
> +             ret = test_ring_enqueue(exact_sz_r, cur_src, esize[i], 1,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_SINGLE);
>               if (ret == -ENOBUFS) {
>                       printf("%s: error, enqueue failed\n", __func__);
>                       goto test_fail;
>               }
> +             cur_src = test_ring_inc_ptr(cur_src, esize[i], 1);
> 
>               /* check that dequeue returns the expected number of
> elements */
> -             ret = test_ring_dequeue(exact_sz_r, obj, esize[i], ring_sz,
> +             ret = test_ring_dequeue(exact_sz_r, cur_dst, esize[i], ring_sz,
>                               TEST_RING_THREAD_DEF |
> TEST_RING_ELEM_BURST);
>               if (ret != (int)ring_sz) {
>                       printf("%s: error, failed to dequeue expected nb of
> elements\n",
>                               __func__);
>                       goto test_fail;
>               }
> +             cur_dst = test_ring_inc_ptr(cur_dst, esize[i], ring_sz);
> 
>               /* check that the capacity function returns expected value */
>               if (rte_ring_get_capacity(exact_sz_r) != ring_sz) { @@ -987,10
> +1047,22 @@ test_ring_with_exact_size(void)
>                       goto test_fail;
>               }
> 
> -             rte_free(obj_orig);
> +             /* check data */
> +             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 test_fail;
> +             }
> +
> +             rte_free(src_orig);
> +             rte_free(dst_orig);
>               rte_ring_free(std_r);
>               rte_ring_free(exact_sz_r);
> -             obj_orig = NULL;
> +             src_orig = NULL;
> +             dst_orig = NULL;
>               std_r = NULL;
>               exact_sz_r = NULL;
>       }
> @@ -998,7 +1070,8 @@ test_ring_with_exact_size(void)
>       return 0;
> 
>  test_fail:
> -     rte_free(obj_orig);
> +     rte_free(src_orig);
> +     rte_free(dst_orig);
>       rte_ring_free(std_r);
>       rte_ring_free(exact_sz_r);
>       return -1;
> --
> 2.17.1

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