app/testpmd: fix MTU after device configure

[dpdk.git] / app / test-pmd / testpmd.c

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 33fc0fd..48e9647 100644 (file)
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2537,6 +2537,8 @@ start_port(portid_t pid)
                }
 
                if (port->need_reconfig > 0) {
+                       uint16_t mtu = RTE_ETHER_MTU;
+
                        port->need_reconfig = 0;
 
                        if (flow_isolate_all) {
@@ -2570,6 +2572,23 @@ start_port(portid_t pid)
                                port->need_reconfig = 1;
                                return -1;
                        }
+
+                       /*
+                        * Workaround for rte_eth_dev_configure(), max_rx_pkt_len
+                        * set MTU wrong for the PMDs that have frame overhead
+                        * bigger than RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN.
+                        * For a PMD that has 26 bytes overhead, rte_eth_dev_configure()
+                        * can set MTU to max 1492, not to expected 1500 bytes.
+                        * Using rte_eth_dev_set_mtu() to be able to set MTU correctly,
+                        * default MTU value is 1500.
+                        */
+                       diag = rte_eth_dev_get_mtu(pi, &mtu);
+                       if (diag)
+                               printf("Failed to get MTU for port %d\n", pi);
+                       diag = rte_eth_dev_set_mtu(pi, mtu);
+                       if (diag != 0 && diag != -ENOTSUP)
+                               printf("Failed to set MTU to %u for port %d\n",
+                                               mtu, pi);
                }
                if (port->need_reconfig_queues > 0) {
                        port->need_reconfig_queues = 0;