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selftests/bpf: Increase SIZEOF_BPF_LOCAL_STORAGE_ELEM on s390x

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sizeof(struct bpf_local_storage_elem) is 512 on s390x:

    struct bpf_local_storage_elem {
            struct hlist_node          map_node;             /*     0    16 */
            struct hlist_node          snode;                /*    16    16 */
            struct bpf_local_storage * local_storage;        /*    32     8 */
            struct callback_head       rcu __attribute__((__aligned__(8))); /*    40    16 */

            /* XXX 200 bytes hole, try to pack */

            /* --- cacheline 1 boundary (256 bytes) --- */
            struct bpf_local_storage_data sdata __attribute__((__aligned__(256))); /*   256     8 */

            /* size: 512, cachelines: 2, members: 5 */
            /* sum members: 64, holes: 1, sum holes: 200 */
            /* padding: 248 */
            /* forced alignments: 2, forced holes: 1, sum forced holes: 200 */
    } __attribute__((__aligned__(256)));

As the existing comment suggests, use a larger number in order to be
future-proof.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230128000650.1516334-14-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ilya Leoshkevich 2023-01-28 01:06:32 +01:00 committed by Alexei Starovoitov
parent 2934565f04
commit 80a611904e
1 changed files with 3 additions and 3 deletions
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6
tools/testing/selftests/bpf/netcnt_common.h
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@ -8,11 +8,11 @@
/* sizeof(struct bpf_local_storage_elem):
*
* It really is about 128 bytes on x86_64, but allocate more to account for
* possible layout changes, different architectures, etc.
* It is about 128 bytes on x86_64 and 512 bytes on s390x, but allocate more to
* account for possible layout changes, different architectures, etc.
* The kernel will wrap up to PAGE_SIZE internally anyway.
*/
#define SIZEOF_BPF_LOCAL_STORAGE_ELEM 256
#define SIZEOF_BPF_LOCAL_STORAGE_ELEM 768
/* Try to estimate kernel's BPF_LOCAL_STORAGE_MAX_VALUE_SIZE: */
#define BPF_LOCAL_STORAGE_MAX_VALUE_SIZE (0xFFFF - \