[dpdk-dev] [PATCH 3/3] examples/ipv4_multicast: limit max frame size

[Andriy Berestovskyy <Andriy.Berestovskyy@caviumnetworks.com>]

Some PMDs do not support 9,5K jumbo frames, so the example fails.
Limit the frame size to the maximum supported by the underlying NIC.

Signed-off-by: Andriy Berestovskyy <Andriy.Berestovskyy@caviumnetworks.com>
---
 examples/ipv4_multicast/main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/ipv4_multicast/main.c b/examples/ipv4_multicast/main.c
index b681f8e..b4bd699 100644
--- a/examples/ipv4_multicast/main.c
+++ b/examples/ipv4_multicast/main.c
@@ -137,7 +137,7 @@ struct lcore_queue_conf {
 } __rte_cache_aligned;
 static struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];
 
-static const struct rte_eth_conf port_conf = {
+static struct rte_eth_conf port_conf = {
 	.rxmode = {
 		.max_rx_pkt_len = JUMBO_FRAME_MAX_SIZE,
 		.split_hdr_size = 0,
@@ -725,6 +725,11 @@ main(int argc, char **argv)
 
 		qconf = &lcore_queue_conf[rx_lcore_id];
 
+		/* limit the frame size to the maximum supported by NIC */
+		rte_eth_dev_info_get(portid, &dev_info);
+		port_conf.rxmode.max_rx_pkt_len = RTE_MIN(
+		    dev_info.max_rx_pktlen, port_conf.rxmode.max_rx_pkt_len);
+
 		/* get the lcore_id for this port */
 		while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
 		       qconf->n_rx_queue == (unsigned)rx_queue_per_lcore) {
@@ -777,7 +782,6 @@ main(int argc, char **argv)
 			printf("txq=%u,%hu ", lcore_id, queueid);
 			fflush(stdout);
 
-			rte_eth_dev_info_get(portid, &dev_info);
 			txconf = &dev_info.default_txconf;
 			txconf->txq_flags = 0;
 			ret = rte_eth_tx_queue_setup(portid, queueid, nb_txd,
-- 
2.7.4