netdev - Re: Why do we use RX queue mapping for TX?

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Message-ID: <1424459287.5565.23.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 20 Feb 2015 11:08:07 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <cwang@...pensource.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Why do we use RX queue mapping for TX?

On Fri, 2015-02-20 at 10:09 -0800, Cong Wang wrote:

> Yes of course, but that means I need an indirect layer to
> map RX to TX (ifb or mirred), since I only care about TX queues. :-/

We do care of TX queues as well, but we use XPS, for performance
reasons.

It looks like you want something very different.

Note : netdev_pick_tx/ndo_select_queue() is called before queue
selection.

Maybe you want something close to the reclassify thing in tc, allowing
a packet to restart the tx _before_ the point netdev_pick_tx() is
called.

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