netdev - Re: [PATCH net-next 10/14] vxlan: Support MC routing in the underlay

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Message-ID: <bf706975-c716-47af-b7ab-3444a06bece2@blackwall.org>
Date: Thu, 12 Jun 2025 13:36:51 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Petr Machata <petrm@...dia.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...il.com>,
 netdev@...r.kernel.org
Cc: Simon Horman <horms@...nel.org>, Ido Schimmel <idosch@...dia.com>,
 mlxsw@...dia.com
Subject: Re: [PATCH net-next 10/14] vxlan: Support MC routing in the underlay

On 6/9/25 23:50, Petr Machata wrote:
> Locally-generated MC packets have so far not been subject to MC routing.
> Instead an MC-enabled installation would maintain the MC routing tables,
> and separately from that the list of interfaces to send packets to as part
> of the VXLAN FDB and MDB.
> 
> In a previous patch, a ip_mr_output() and ip6_mr_output() routines were
> added for IPv4 and IPv6. All locally generated MC traffic is now passed
> through these functions. For reasons of backward compatibility, an SKB
> (IPCB / IP6CB) flag guards the actual MC routing.
> 
> This patch adds logic to set the flag, and the UAPI to enable the behavior.
> 
> Signed-off-by: Petr Machata <petrm@...dia.com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> ---
> 
> Notes:
> CC:Andrew Lunn <andrew+netdev@...n.ch>
> CC:Menglong Dong <menglong8.dong@...il.com>
> 
>   drivers/net/vxlan/vxlan_core.c | 22 ++++++++++++++++++++--
>   include/net/vxlan.h            |  5 ++++-
>   include/uapi/linux/if_link.h   |  1 +
>   3 files changed, 25 insertions(+), 3 deletions(-)
> 

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>