hash: fix key store element alignment

Fix the key store array element alignment such that every array
element is aligned on KEY_ALIGNMENT boundary. This is required to
make 'pdata' in 'struct rte_hash_key' align on its natural boundary
for atomic load/store.

Fixes: 473d1bebce43 ("hash: allow to store data in hash table")
Cc: stable@dpdk.org

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Yipeng Wang <yipeng1.wang@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

lib/librte_hash/rte_cuckoo_hash.c

@@ -279,7 +279,9 @@ rte_hash_create(const struct rte_hash_parameters *params)
 			rte_ring_sp_enqueue(r_ext, (void *)((uintptr_t) i));
 	}
 
-	const uint32_t key_entry_size = sizeof(struct rte_hash_key) + params->key_len;
+	const uint32_t key_entry_size =
+		RTE_ALIGN(sizeof(struct rte_hash_key) + params->key_len,
+			  KEY_ALIGNMENT);
 	const uint64_t key_tbl_size = (uint64_t) key_entry_size * num_key_slots;
 
 	k = rte_zmalloc_socket(NULL, key_tbl_size,

lib/librte_hash/rte_cuckoo_hash.h

@@ -123,7 +123,7 @@ struct rte_hash_key {
 	};
 	/* Variable key size */
 	char key[0];
-} __attribute__((aligned(KEY_ALIGNMENT)));
+};
 
 /* All different signature compare functions */
 enum rte_hash_sig_compare_function {