netdev - Re: [PATCH] net: Allocate RX and TX queues in alloc_netdev

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Date:	Thu, 28 Oct 2010 11:08:23 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: Allocate RX and TX queues in alloc_netdev_mq

On Thu, Oct 28, 2010 at 10:49 AM, David Miller <davem@...emloft.net> wrote:
> From: Tom Herbert <therbert@...gle.com>
> Date: Thu, 28 Oct 2010 10:45:45 -0700 (PDT)
>
>> Both TX and RX queue allocations in the netdev structure had been moved
>> to register_device with the idea that the number of queues could be
>> changed between device allocation and registration.  It was determined
>> that changing the num_queues after the call to alloc_netdev_mq was not
>> a good idea, so that was abandoned.  Also, some drivers call
>> netif_queue_start without registering device, which causes panic
>> when dev->_tx queue structure is accessed.  This patch moves queue
>> allocations back to alloc_netdev_mq to fix these issues.
>>
>> Signed-off-by: Tom Herbert <therbert@...gle.com>
>
> Changing the TX queue state with a netif_stop_queue() call or
> similar was always completely pointless and frankly a bug.
>
> So that should not influence the motivation behind this change
> at all.
>
> In fact I _like_ that it crashes now so that we are forced
> to fix these cases.
>
> Really, the queue state is absolutely immaterial during
> device allocation and registration.  It's state is
> %100 "don't care" until ->open() is invoked.
>
> So any code that touches the queue state at these earlier points in
> time is completely extraneous if not broken.
>
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