datapath: Fix max MTU size on RHEL 7.5 kernel

Without the patch, in RHEL 7.5, the maximum configurable MTU of vport
internal device is 1500, which shall be 65535.  This patch fixes this
issue.

Fixes: 39ca338374ab ("datapath: compat: Fix build on RHEL 7.5")
Reported-by: Lucas Alvares Gomes <lucasagomes@gmail.com>
Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>

diff --git a/datapath/vport-internal_dev.c b/datapath/vport-internal_dev.c
index 3cb8d06b2475c7612f9fb17cee6b23379098a4d2..3fa86815c7fa08b6e1df977dd0335821d3645cfb 100644 (file)
--- a/datapath/vport-internal_dev.c
+++ b/datapath/vport-internal_dev.c
@@ -169,6 +169,8 @@ static void do_setup(struct net_device *netdev)
 
 #ifdef HAVE_NET_DEVICE_WITH_MAX_MTU
        netdev->max_mtu = ETH_MAX_MTU;
+#elif HAVE_RHEL7_MAX_MTU
+       netdev->extended->max_mtu = ETH_MAX_MTU;
 #endif
        netdev->netdev_ops = &internal_dev_netdev_ops;