[PATCH v1 5/5] examples/l3fwd: enable direct rearm mode

[Feifei Wang]

Enable direct rearm mode. The mapping is decided in the data plane based
on the first packet received.

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
---
 examples/l3fwd/l3fwd_lpm.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/examples/l3fwd/l3fwd_lpm.c b/examples/l3fwd/l3fwd_lpm.c
index bec22c44cd..38ffdf4636 100644
--- a/examples/l3fwd/l3fwd_lpm.c
+++ b/examples/l3fwd/l3fwd_lpm.c
@@ -147,7 +147,7 @@ lpm_main_loop(__rte_unused void *dummy)
 	unsigned lcore_id;
 	uint64_t prev_tsc, diff_tsc, cur_tsc;
 	int i, nb_rx;
-	uint16_t portid;
+	uint16_t portid, tx_portid;
 	uint8_t queueid;
 	struct lcore_conf *qconf;
 	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
@@ -158,6 +158,8 @@ lpm_main_loop(__rte_unused void *dummy)
 
 	const uint16_t n_rx_q = qconf->n_rx_queue;
 	const uint16_t n_tx_p = qconf->n_tx_port;
+	int direct_rearm_map[n_rx_q];
+
 	if (n_rx_q == 0) {
 		RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id);
 		return 0;
@@ -169,6 +171,7 @@ lpm_main_loop(__rte_unused void *dummy)
 
 		portid = qconf->rx_queue_list[i].port_id;
 		queueid = qconf->rx_queue_list[i].queue_id;
+		direct_rearm_map[i] = 0;
 		RTE_LOG(INFO, L3FWD,
 			" -- lcoreid=%u portid=%u rxqueueid=%hhu\n",
 			lcore_id, portid, queueid);
@@ -209,6 +212,17 @@ lpm_main_loop(__rte_unused void *dummy)
 			if (nb_rx == 0)
 				continue;
 
+			/* Determine the direct rearm mapping based on the first
+			 * packet received on the rx queue
+			 */
+			if (direct_rearm_map[i] == 0) {
+				tx_portid = lpm_get_dst_port(qconf, pkts_burst[0],
+							portid);
+				rte_eth_direct_rxrearm_map(portid, queueid,
+								tx_portid, queueid);
+				direct_rearm_map[i] = 1;
+			}
+
 #if defined RTE_ARCH_X86 || defined __ARM_NEON \
 			 || defined RTE_ARCH_PPC_64
 			l3fwd_lpm_send_packets(nb_rx, pkts_burst,
-- 
2.25.1