netdev - Re: [RFC net-next PATCH V2 2/3] qdisc: bulk dequeue support for qdiscs with TCQ_F

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Message-ID: <1410008149.11872.9.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 06 Sep 2014 05:55:49 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Florian Westphal <fw@...len.de>,
	Daniel Borkmann <dborkman@...hat.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Alexander Duyck <alexander.duyck@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: Re: [RFC net-next PATCH V2 2/3] qdisc: bulk dequeue support for
 qdiscs with TCQ_F_ONETXQUEUE

On Fri, 2014-09-05 at 10:28 +0200, Jesper Dangaard Brouer wrote:

> 
> So, I cannot see if it is a TSO packet via the skb_is_gso(skb) check?
> Will skb->len be the length of the full TSO packet size?


There is no difference between a TSO and GSO packet. They are what we
call a GSO packet.

The difference lies on the device ability to perform TSO.

If device is not able to send a TSO packet, packet is segmented by the
core networking stack.



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