netdev-dpdk: Disable outer udp checksum offload for txgbe driver.

Fixing the issue of incorrect outer UDP checksum in packets sent by
the wangxun network card (driver is txgbe), we disabled
RTE_ETH_TX_OFFLOAD_OUTER_UDP_CKSUM.

Fixes: 084c808 ("userspace: Support VXLAN and GENEVE TSO.")
Reported-by: Jun Wang <junwang01@cestc.cn>

Acked-by: David Marchand <david.marchand@redhat.com>
Acked-by: Simon Horman <horms@ovn.org>
Signed-off-by: Jun Wang <junwang01@cestc.cn>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>

lib/netdev-dpdk.c

@@ -1355,12 +1355,13 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
 
     if (!strcmp(info.driver_name, "net_ice")
         || !strcmp(info.driver_name, "net_i40e")
-        || !strcmp(info.driver_name, "net_iavf")) {
+        || !strcmp(info.driver_name, "net_iavf")
+        || !strcmp(info.driver_name, "net_txgbe")) {
         /* FIXME: Driver advertises the capability but doesn't seem
          * to actually support it correctly.  Can remove this once
          * the driver is fixed on DPDK side. */
         VLOG_INFO("%s: disabled Tx outer udp checksum offloads for a "
-                  "net/ice, net/i40e or net/iavf port.",
+                  "net/ice, net/i40e, net/iavf or net/txgbe port.",
                   netdev_get_name(&dev->up));
         info.tx_offload_capa &= ~RTE_ETH_TX_OFFLOAD_OUTER_UDP_CKSUM;
         info.tx_offload_capa &= ~RTE_ETH_TX_OFFLOAD_VXLAN_TNL_TSO;