diff options
| author | Jack Ma <jack4it@gmail.com> | 2026-07-24 00:26:16 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-07-30 16:09:22 -0700 |
| commit | 53531e6a644a48c2d5a9423f084ae4e91ec6019a (patch) | |
| tree | 7bd8e48524858041fd8c3ab24db043dcf66e33e0 /include/uapi | |
| parent | 61a878bafdf67748cde1358c0533b9dc73bda789 (diff) | |
net: nexthop: add NHA_DST_PORT for fdb nexthops
Commit 1274e1cc4226 ("vxlan: ecmp support for mac fdb entries") lets a
single inner MAC be reached through a group of remote VTEPs, with the
kernel flow-hashing across the group members. Each member carries its
own remote IP, but the UDP destination port is always taken from the
VXLAN device (vxlan->cfg.dst_port) and cannot be set per member.
Some deployments pack several receivers behind one underlay IP and tell
them apart by UDP port, so they need a per-nexthop destination port to
spread flows across (IP, port) tuples rather than IP alone.
Add a netlink attribute NHA_DST_PORT (__be16, mirroring NDA_PORT) that
carries an optional UDP destination port on an fdb nexthop. It is only
accepted together with NHA_FDB and NHA_GATEWAY; it is stored in struct
nh_info and echoed back on dump. The attribute is named generically
rather than fdb-specific so it can be reused should another nexthop type
ever need a destination port. This patch is control-plane plumbing
only; the VXLAN datapath is wired up in a follow-up patch, so behaviour
is unchanged for now.
Signed-off-by: Jack Ma <jack4it@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20260724-b4-vxlan-fdb-port-v5-1-cd1c6aeee058@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/nexthop.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/nexthop.h b/include/uapi/linux/nexthop.h index bc49baf4a267..59cf1cee93bd 100644 --- a/include/uapi/linux/nexthop.h +++ b/include/uapi/linux/nexthop.h @@ -83,6 +83,9 @@ enum { /* u32; read-only; whether any driver collects HW stats */ NHA_HW_STATS_USED, + /* be16; UDP destination port for an fdb nexthop (e.g. VXLAN) */ + NHA_DST_PORT, + __NHA_MAX, }; |