netdev - Re: [PATCH net v2] net: dsa: tag_rtl4

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Date: Thu, 2 Nov 2023 12:48:13 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: dsa: tag_rtl4_a: Bump min packet size

On Tue, Oct 31, 2023 at 10:22:05PM +0100, Linus Walleij wrote:
> Hi Vladimir,
> 
> I got around to testing this too:
> 
> # ping -s 1472 192.168.1.137
> 
> The result:
> 
> SKB before padding:
> 37 (192.168.1.13skb len=1514 headroom=18 headlen=1514 tailroom=260
> mac=(18,14) net=(32,20) trans=52
> shinfo(txflags=0 nr_frags=0 gso(size=0 type=0 segs=0))
> csum(0xd4ef2b1 ip_summed=0 complete_sw=0 valid=0 level=0)
> hash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0
> 7): 1472 data bydev name=lan0 feat=0x0002000000005020
> tes
> sk family=2 type=3 proto=1
> 
> SKB after padding:
> skb len=1518 headroom=18 headlen=1518 tailroom=256
> mac=(18,14) net=(32,20) trans=52
> shinfo(txflags=0 nr_frags=0 gso(size=0 type=0 segs=0))
> csum(0xd4ef2b1 ip_summed=0 complete_sw=0 valid=0 level=0)
> hash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0
> dev name=lan0 feat=0x0002000000005020
> sk family=2 type=3 proto=1
> 
> As expected the linear SKB is 4 bytes longer in this case.

Ok, I'm not seeing anything unusual about the skb geometry in the
skb_dump() output.