if (!spd)
return VNET_API_ERROR_SYSCALL_ERROR_1;
+ if (im->flow_cache_flag && !policy->is_ipv6 &&
+ policy->type == IPSEC_SPD_POLICY_IP4_OUTBOUND)
+ {
+ /*
+ * Flow cache entry is valid only when epoch_count value in control
+ * plane and data plane match. Otherwise, flow cache entry is considered
+ * stale. To avoid the race condition of using old epoch_count value
+ * in data plane after the roll over of epoch_count in control plane,
+ * entire flow cache is reset.
+ */
+ if (im->epoch_count == 0xFFFFFFFF)
+ {
+ /* Reset all the entries in flow cache */
+ clib_memset_u8 (im->ipsec4_out_spd_hash_tbl, 0,
+ im->ipsec4_out_spd_hash_num_buckets *
+ (sizeof (*(im->ipsec4_out_spd_hash_tbl))));
+ }
+ /* Increment epoch counter by 1 */
+ clib_atomic_fetch_add_relax (&im->epoch_count, 1);
+ /* Reset spd flow cache counter since all old entries are stale */
+ clib_atomic_store_relax_n (&im->ipsec4_out_spd_flow_cache_entries, 0);
+ }
+
if (is_add)
{
u32 policy_index;