linux-kernel - Re: [PATCH net-next v3 06/12] net: vxlan: make vxlan

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Message-ID: <ZuFP9EAu4MxlY7k0@shredder.lan>
Date: Wed, 11 Sep 2024 11:08:20 +0300
From: Ido Schimmel <idosch@...dia.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: kuba@...nel.org, aleksander.lobakin@...el.com, horms@...nel.org,
	davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
	dsahern@...nel.org, dongml2@...natelecom.cn, amcohen@...dia.com,
	gnault@...hat.com, bpoirier@...dia.com, b.galvani@...il.com,
	razor@...ckwall.org, petrm@...dia.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 06/12] net: vxlan: make vxlan_snoop() return
 drop reasons

On Mon, Sep 09, 2024 at 03:16:46PM +0800, Menglong Dong wrote:
> @@ -1447,7 +1448,7 @@ static bool vxlan_snoop(struct net_device *dev,
>  
>  	/* Ignore packets from invalid src-address */
>  	if (!is_valid_ether_addr(src_mac))
> -		return true;
> +		return SKB_DROP_REASON_VXLAN_INVALID_SMAC;

[...]

> diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
> index 98259d2b3e92..1b9ec4a49c38 100644
> --- a/include/net/dropreason-core.h
> +++ b/include/net/dropreason-core.h
> @@ -94,6 +94,8 @@
>  	FN(TC_RECLASSIFY_LOOP)		\
>  	FN(VXLAN_INVALID_HDR)		\
>  	FN(VXLAN_VNI_NOT_FOUND)		\
> +	FN(VXLAN_INVALID_SMAC)		\

Since this is now part of the core reasons, why not name it
"INVALID_SMAC" so that it could be reused outside of the VXLAN driver?
For example, the bridge driver has the exact same check in its receive
path (see br_handle_frame()).

> +	FN(VXLAN_ENTRY_EXISTS)		\
>  	FN(IP_TUNNEL_ECN)		\
>  	FNe(MAX)