netdev - Re: [PATCH net-next] vxlan: set mac

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Date:	Thu, 12 May 2016 11:07:45 +0200
From:	Jiri Benc <jbenc@...hat.com>
To:	Shmulik Ladkani <shmulik.ladkani@...il.com>
Cc:	netdev@...r.kernel.org, Simon Horman <simon.horman@...ronome.com>
Subject: Re: [PATCH net-next] vxlan: set mac_header correctly in GPE mode

On Thu, 12 May 2016 09:47:58 +0300, Shmulik Ladkani wrote:
> Would it make sense to perform this within __iptunnel_pull_header (in
> case raw_proto is true) for all __iptunnel_pull_header callers?

raw_proto just denotes that inner_proto of ETH_P_TEB should not be
treated specially. Guessing any other special meaning based on this
flag would be unexpected and confusing. Specifically,
__iptunnel_pull_header doesn't have and should not have any notion of
the device type; although all current users of raw_proto == true are of
ARPHRD_NONE type, it's not a requirement.

> If not (meaning vxlan specific), in next few lines we have:
> 
> 	if (!raw_proto) {
> 		if (!vxlan_set_mac(vxlan, vs, skb))
> 			goto drop;
> 	} else {
> 		skb->dev = vxlan->dev;
> 		skb->pkt_type = PACKET_HOST;
> 	}
> 
> Seems more appropriate to place the missing 'skb_reset_mac_header'
> within the "else" part, which logically holds all "things to initialize
> in the skb if raw_proto is true, thus havn't called vxlan_set_mac".

I agree. I'll respin the patch.

Thanks!

 Jiri