netdev - Re: [PATCH 0/2] net: introduce IFF_NO_QUEUE as successor of zero tx_queue

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Message-ID: <20150813104950.1b8346f2@urahara>
Date:	Thu, 13 Aug 2015 10:49:50 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Phil Sutter <phil@....cc>
Cc:	netdev@...r.kernel.org, brouer@...hat.com,
	alexei.starovoitov@...il.com, davem@...emloft.net, fw@...len.de,
	cwang@...pensource.com, eric.dumazet@...il.com
Subject: Re: [PATCH 0/2] net: introduce IFF_NO_QUEUE as successor of zero
 tx_queue_len

On Thu, 13 Aug 2015 19:01:05 +0200
Phil Sutter <phil@....cc> wrote:

> Up to now, drivers being aware of the above applying to them set
> dev->tx_queue_len to zero to indicate no qdisc should be attached to the
> interface they drive and the kernel reacts upon this by assigning the noop
> qdisc instead of the default pfifo_fast. This implicit agreement though leads
> to an inconvenient situation once a user tries to attach a real qdisc to these
> devices, as the formerly special tx_queue_len value becomes a regular one,

So this is a workaround for user ignorance by introducing kernel API complexity.
Before user sets qdisc, why don't they set tx queue length?
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