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To: Dave Taht <dave.taht@gmail.com>
Cc: Sebastian Moeller <moeller0@gmx.de>, Cake List
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Date: Mon, 18 Oct 2021 15:02:09 +0200
X-Clacks-Overhead: GNU Terry Pratchett
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Subject: Re: [Cake] [Ecn-sane]  l4s kernel submission
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Dave Taht <dave.taht@gmail.com> writes:

> An open question for me:
>
> What happens when a GSO packet is marked? Do all the packets get the
> marking, or just the first?

When segmenting a GSO packet, the IP header is copied to all segments.
The code has grown quite complex over the years, but it's easier to see
in the original submission from 2006:

https://lore.kernel.org/all/20060622081400.GC22671@gondor.apana.org.au/

Which means all packets in a GSO segment will end up marked on the
wire...

-Toke