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Message-ID: <20230307131828.ly5zudvllke2pe4j@skbuf>
Date: Tue, 7 Mar 2023 15:18:28 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: "Song, Xiongwei" <Xiongwei.Song@...driver.com>
Cc: "claudiu.manoil@....com" <claudiu.manoil@....com>,
"alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
"UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"kuba@...nel.org" <kuba@...nel.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"richardcochran@...il.com" <richardcochran@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Response error to fragmented ICMP echo request
On Tue, Mar 07, 2023 at 12:56:17PM +0000, Song, Xiongwei wrote:
> > Frames 3 and 4 are sent with DEI=1 and are dropped, frames 1 and 2 are
> > sent with DEI=0 and are not dropped. I'm not sure if varying the DEI
> > field is part of the intentions of the test? Is there any RFC which says
> > that IP fragments over VLAN should use DEI=1, or some other reason?
>
> I didn't notice that. Let me check the test why set DEI=1.
Ok. It would be good to have an answer to this, because one of the
assumptions of that patch was that whomever sets DEI=1 doesn't get to
complain that their packets are *actually* dropped :)
FWIW, if you do need to set up a reservation for traffic received on a
port, section 8.6.3.3.15 Buffer reservation watermarks (page 817) should
help with this:
https://www.nxp.com/docs/en/user-guide/LLDPUG_RevL5.15.71-2.2.0.pdf
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