From: Eric Dumazet
Date: Thu Nov 05 2015 - 10:56:15 EST

On Thu, 2015-11-05 at 16:00 +0100, Jason A. Donenfeld wrote:

> Right -- I saw the expansion in the header file -- it gets the various
> TSOs plus UFO. So what this means is that the packet hasn't yet been
> split up? So were I to add this option, then my driver would have to
> be responsible for splitting up the super-packets manually? In which
> case, there would be no performance benefit in using it, since GSO
> already does this just prior to ndo_start_xmit? Or would there be a
> performance benefit in receiving the super-packets and splitting them
> myself?

It is a performance benefit only if you use the helpers from
net/core/tso.c as some drivers already do.

Otherwise, calling the skb_gso_segment() from your driver has no gain
compared to the one done from core networking stack.

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