Re: [PATCH net-next v4 2/3] vxlan: honor per-nexthop fdb destination port

On 7/22/26 7:17 PM, Jack Ma wrote:

When an fdb entry points at a nexthop group, vxlan_fdb_nh_path_select()
resolves the selected leg's remote IP but leaves the UDP destination port
at the device default (vxlan->cfg.dst_port).

Extend nexthop_path_fdb_result() to also return the selected nexthop's
NHA_DST_PORT (0 when unset) and have vxlan_fdb_nh_path_select() store it
in rdst->remote_port.  vxlan_xmit_one() already prefers rdst->remote_port
when non-zero and falls back to the device port otherwise, so nexthops
without a port are unaffected.

This lets one fdb nexthop group load-balance a flow across legs that
share an underlay IP but differ in UDP destination port.

Signed-off-by: Jack Ma <redacted>
---
 include/net/nexthop.h | 4 +++-
 include/net/vxlan.h   | 5 ++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

Reviewed-by: David Ahern <dsahern@kernel.org>