-.. code-block:: c
-
- static struct rte_flow *
- generate_ipv4_flow(uint8_t port_id, uint16_t rx_q,
- uint32_t src_ip, uint32_t src_mask,
- uint32_t dest_ip, uint32_t dest_mask,
- struct rte_flow_error *error)
- {
- struct rte_flow_attr attr;
- struct rte_flow_item pattern[MAX_PATTERN_NUM];
- struct rte_flow_action action[MAX_ACTION_NUM];
- struct rte_flow *flow = NULL;
- struct rte_flow_action_queue queue = { .index = rx_q };
- struct rte_flow_item_ipv4 ip_spec;
- struct rte_flow_item_ipv4 ip_mask;
-
- memset(pattern, 0, sizeof(pattern));
- memset(action, 0, sizeof(action));
-
- /*
- * set the rule attribute.
- * in this case only ingress packets will be checked.
- */
- memset(&attr, 0, sizeof(struct rte_flow_attr));
- attr.ingress = 1;
-
- /*
- * create the action sequence.
- * one action only, move packet to queue
- */
- action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
- action[0].conf = &queue;
- action[1].type = RTE_FLOW_ACTION_TYPE_END;
-
- /*
- * set the first level of the pattern (ETH).
- * since in this example we just want to get the
- * ipv4 we set this level to allow all.
- */
- pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
-
- /*
- * setting the second level of the pattern (IP).
- * in this example this is the level we care about
- * so we set it according to the parameters.
- */
- memset(&ip_spec, 0, sizeof(struct rte_flow_item_ipv4));
- memset(&ip_mask, 0, sizeof(struct rte_flow_item_ipv4));
- ip_spec.hdr.dst_addr = htonl(dest_ip);
- ip_mask.hdr.dst_addr = dest_mask;
- ip_spec.hdr.src_addr = htonl(src_ip);
- ip_mask.hdr.src_addr = src_mask;
- pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
- pattern[1].spec = &ip_spec;
- pattern[1].mask = &ip_mask;
-
- /* the final level must be always type end */
- pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
-
- int res = rte_flow_validate(port_id, &attr, pattern, action, error);
- if(!res)
- flow = rte_flow_create(port_id, &attr, pattern, action, error);
-
- return flow;
- }