Re: NETIF_F_GSO_SOFTWARE vs NETIF_F_GSO

[Eric Dumazet]

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.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/