From: David Ahern <dsahern@kernel.org>
To: Jack Ma <jack4it@gmail.com>, Ido Schimmel <idosch@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>, Shuah Khan <shuah@kernel.org>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH net-next v4 2/3] vxlan: honor per-nexthop fdb destination port
Date: Thu, 23 Jul 2026 08:41:30 -0600 [thread overview]
Message-ID: <991b7602-fd1c-4d17-aee2-bb60650cdbed@kernel.org> (raw)
In-Reply-To: <20260723-b4-vxlan-fdb-port-v4-2-46e3a2dd88a3@gmail.com>
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 <jack4it@gmail.com>
> ---
> include/net/nexthop.h | 4 +++-
> include/net/vxlan.h | 5 ++++-
> 2 files changed, 7 insertions(+), 2 deletions(-)
>
Reviewed-by: David Ahern <dsahern@kernel.org>
next prev parent reply other threads:[~2026-07-23 14:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 1:17 [PATCH net-next v4 0/3] net: nexthop: per-nexthop UDP dst port for fdb (VXLAN) nexthops Jack Ma
2026-07-23 1:17 ` [PATCH net-next v4 1/3] net: nexthop: add NHA_DST_PORT for fdb nexthops Jack Ma
2026-07-23 7:48 ` Ido Schimmel
2026-07-23 14:40 ` David Ahern
2026-07-23 1:17 ` [PATCH net-next v4 2/3] vxlan: honor per-nexthop fdb destination port Jack Ma
2026-07-23 7:48 ` Ido Schimmel
2026-07-23 14:41 ` David Ahern [this message]
2026-07-23 1:17 ` [PATCH net-next v4 3/3] selftests: net: add coverage for fdb nexthop dst_port Jack Ma
2026-07-23 7:49 ` Ido Schimmel
2026-07-23 14:44 ` David Ahern
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