netdev - Re: future developments of usbnet

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Date:	Sat, 14 May 2011 12:46:09 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	tom.leiming@...il.com, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: future developments of usbnet

2011/5/14 Oliver Neukum <oliver@...kum.org>:
> Am Donnerstag, 12. Mai 2011, 16:37:28 schrieb Alan Stern:
>> Therefore usbnet's poll routine should take the "weight" argument as an
>> indication of how many outstanding rx URBs are allowed.  Each time the
>> poll routine is called, it should check to see if any rx URBs have
>> completed since the previous poll.  If not then there is no network
>> traffic, so usbnet can take itself out of the poll loop.  Otherwise,
>> the number of outstanding URBs should be adjusted (by unlinking some or
>> submitting more -- subject to some fixed maximum limit) to match the
>> new "weight".
> What does happen if we reach the weight 0 ?

Poll callback won't be called with weight 0. If there are more RX
packets after processing 'weight' of them, then the callback will be
called again later.

Best Regards,
Michał Mirosław
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