netdev - Re: [RFC PATCH v2 0/9] bql: Byte Queue Limits

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Date:	Mon, 8 Aug 2011 10:56:21 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/9] bql: Byte Queue Limits

On Mon, Aug 8, 2011 at 10:55 AM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Mon, 8 Aug 2011 10:51:06 -0700
> Tom Herbert <therbert@...gle.com> wrote:
>
>> On Mon, Aug 8, 2011 at 8:40 AM, Stephen Hemminger <shemminger@...tta.com> wrote:
>> > On Sun, 7 Aug 2011 21:43:13 -0700 (PDT)
>> > Tom Herbert <therbert@...gle.com> wrote:
>> >
>> >>     netdev_tx_completed_queue: Called at end of transmit completion
>> >>       to inform stack of number of bytes and packets processed.
>> >>     netdev_tx_sent_queue: Called to inform stack when packets are
>> >>       queued.
>> >
>> > Couldn't these be done for the device in the existing qdisc infra
>> > structure (or dev_start_xmit). Alternatively, rename ndo_start_xmit
>> > to something else and make all the callers use the wrapper.
>> >
>> > Changing all the drivers for something that the driver has no real
>> > need to care about seems like incorrect object design.
>> >
>> The netdev_tx_completed_queue is needed to inform the stack of number
>> of packets and bytes completed in an execution of transmit completion
>> (epic).  I don't see a way to get that information outside of the
>> driver.
>>
>> Tom
>
> Since transmit completion means calling dev_kfree_skb() why not account
> there? You could add some info to netdev if necessary to get compile
> the statistics.
>
> I just hate driver api complexity growth.
>
>
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