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Message-ID: <20231102104813.qyzkfpbwz4kiloez@skbuf> 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.
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