Function ip4_lookup_node_process_scalar

dpdk/lib/node/ip4_lookup.c:50–119

#endif

static uint16_t
ip4_lookup_node_process_scalar(struct rte_graph *graph, struct rte_node *node,
			void **objs, uint16_t nb_objs)
{
	struct rte_lpm *lpm = IP4_LOOKUP_NODE_LPM(node->ctx);
	const int dyn = IP4_LOOKUP_NODE_PRIV1_OFF(node->ctx);
	struct rte_ipv4_hdr *ipv4_hdr;
	void **to_next, **from;
	uint16_t last_spec = 0;
	struct rte_mbuf *mbuf;
	rte_edge_t next_index;
	uint16_t held = 0;
	uint32_t drop_nh;
	int i, rc;

	/* Speculative next */
	next_index = RTE_NODE_IP4_LOOKUP_NEXT_REWRITE;
	/* Drop node */
	drop_nh = ((uint32_t)RTE_NODE_IP4_LOOKUP_NEXT_PKT_DROP) << 16;
	from = objs;

	/* Get stream for the speculated next node */
	to_next = rte_node_next_stream_get(graph, node, next_index, nb_objs);
	for (i = 0; i < nb_objs; i++) {
		uint32_t next_hop;
		uint16_t next;

		mbuf = (struct rte_mbuf *)objs[i];

		/* Extract DIP of mbuf0 */
		ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf, struct rte_ipv4_hdr *,
				sizeof(struct rte_ether_hdr));
		/* Extract cksum, ttl as ipv4 hdr is in cache */
		node_mbuf_priv1(mbuf, dyn)->cksum = ipv4_hdr->hdr_checksum;
		node_mbuf_priv1(mbuf, dyn)->ttl = ipv4_hdr->time_to_live;

		rc = rte_lpm_lookup(lpm, rte_be_to_cpu_32(ipv4_hdr->dst_addr),
				    &next_hop);
		next_hop = (rc == 0) ? next_hop : drop_nh;

		node_mbuf_priv1(mbuf, dyn)->nh = (uint16_t)next_hop;
		next_hop = next_hop >> 16;
		next = (uint16_t)next_hop;

		if (unlikely(next_index != next)) {
			/* Copy things successfully speculated till now */
			rte_memcpy(to_next, from, last_spec * sizeof(from[0]));
			from += last_spec;
			to_next += last_spec;
			held += last_spec;
			last_spec = 0;

			rte_node_enqueue_x1(graph, node, next, from[0]);
			from += 1;
		} else {
			last_spec += 1;
		}
	}