[dpdk-dev] [PATCH] examples: fix symmetric_mp, set NIC rx_drop_en bit

[Bruce Richardson <bruce.richardson@intel.com>]

The symmetric_mp example app is set up to allow two processes to
share a NIC port, with each pulling packets from one queue. In order
to have the app continue working when one of the process dies, the
drop_en bit should be set in the NIC configuration. Without this bit
set, the NIC will stall once any queue fills. With the bit set, once
a queue fills, all subsequent packets for that queue are discarded
allowing other queues to continue operating as normal.

This setting was missed when converting to use standardised defaults
in commit 81f7ecd9.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 examples/multi_process/symmetric_mp/main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/multi_process/symmetric_mp/main.c b/examples/multi_process/symmetric_mp/main.c
index 01faae9..2fc2acf 100644
--- a/examples/multi_process/symmetric_mp/main.c
+++ b/examples/multi_process/symmetric_mp/main.c
@@ -229,6 +229,7 @@ smp_port_init(uint8_t port, struct rte_mempool *mbuf_pool, uint16_t num_queues)
 			}
 	};
 	const uint16_t rx_rings = num_queues, tx_rings = num_queues;
+	struct rte_eth_dev_info info;
 	int retval;
 	uint16_t q;
 
@@ -241,6 +242,9 @@ smp_port_init(uint8_t port, struct rte_mempool *mbuf_pool, uint16_t num_queues)
 	printf("# Initialising port %u... ", (unsigned)port);
 	fflush(stdout);
 
+	rte_eth_dev_info_get(port, &info);
+	info.default_rxconf.rx_drop_en = 1;
+
 	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
 	if (retval < 0)
 		return retval;
@@ -248,7 +252,7 @@ smp_port_init(uint8_t port, struct rte_mempool *mbuf_pool, uint16_t num_queues)
 	for (q = 0; q < rx_rings; q ++) {
 		retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
 				rte_eth_dev_socket_id(port),
-				NULL,
+				&info.default_rxconf,
 				mbuf_pool);
 		if (retval < 0)
 			return retval;
-- 
1.9.3