netdev - Re: [PATCH iproute2-next v1 1/1 v1] ip-link: add support for nolocalbypass in vxlan

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Date:   Fri, 24 Mar 2023 09:38:29 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Vladimir Nikishkin <vladimir@...ishkin.pw>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com,
        eng.alaamohamedsoliman.am@...il.com, gnault@...hat.com,
        razor@...ckwall.org, idosch@...dia.com, eyal.birger@...il.com,
        jtoppins@...hat.com
Subject: Re: [PATCH iproute2-next v1 1/1 v1] ip-link: add support for
 nolocalbypass in vxlan

Hi Vladimir,

For the subject prefix, [PATCH iproute2-next] is enough for the v1 patch.

On Thu, Mar 23, 2023 at 02:04:51PM +0800, Vladimir Nikishkin wrote:
> Add userspace support for the nolocalbypass vxlan netlink
> attribute. With nolocalbypass, if an entry is pointing to the
> local machine, but the system driver is not listening on this
> port, the driver will not drop packets, but will forward them
> to the userspace network stack instead.
> 
> This commit has a corresponding patch in the net-next list.
> 
> Signed-off-by: Vladimir Nikishkin <vladimir@...ishkin.pw>
> ---
>  include/uapi/linux/if_link.h |  1 +
>  ip/iplink_vxlan.c            | 18 ++++++++++++++++++
>  man/man8/ip-link.8.in        |  8 ++++++++
>  3 files changed, 27 insertions(+)
> 
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index d61bd32d..fd390b40 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -824,6 +824,7 @@ enum {
>  	IFLA_VXLAN_TTL_INHERIT,
>  	IFLA_VXLAN_DF,
>  	IFLA_VXLAN_VNIFILTER, /* only applicable with COLLECT_METADATA mode */
> +	IFLA_VXLAN_LOCALBYPASS,
>  	__IFLA_VXLAN_MAX
>  };
>  #define IFLA_VXLAN_MAX	(__IFLA_VXLAN_MAX - 1)

There is no need to include the uapi header. Stephen will sync it with upstream.

Hi Stephen, should we add this note to the README.devel?

> diff --git a/ip/iplink_vxlan.c b/ip/iplink_vxlan.c
> index c7e0e1c4..17fa5cf7 100644
> --- a/ip/iplink_vxlan.c
> +++ b/ip/iplink_vxlan.c
> @@ -276,6 +276,12 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
>  		} else if (!matches(*argv, "noudpcsum")) {
>  			check_duparg(&attrs, IFLA_VXLAN_UDP_CSUM, *argv, *argv);
>  			addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, 0);
> +		} else if (!matches(*argv, "localbypass")) {
> +			check_duparg(&attrs, IFLA_VXLAN_LOCALBYPASS, *argv, *argv);
> +			addattr8(n, 1024, IFLA_VXLAN_LOCALBYPASS, 1);
> +		} else if (!matches(*argv, "nolocalbypass")) {
> +			check_duparg(&attrs, IFLA_VXLAN_LOCALBYPASS, *argv, *argv);
> +			addattr8(n, 1024, IFLA_VXLAN_LOCALBYPASS, 0);

matches is deparated, please use strcmp instead.

Thanks
Hangbin