linux-kernel - RE: [PATCH net-next 2/2] r8152: adjust rtl_start

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2ECE46C@RTITMBSV03.realtek.com.tw>
Date:	Wed, 12 Nov 2014 06:29:46 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next 2/2] r8152: adjust rtl_start_rx

David Miller [mailto:davem@...emloft.net] 
> Sent: Wednesday, November 12, 2014 1:44 PM
[...]
> What do other USB network drivers do in similar situations?

According to the usbnet.c, it would make sure to submit the
number of min(10, RX_QLEN(dev)) rx buffers. If there are
not enough rx buffers, it schedule a tasklet for next try.

The brief flow is as following.
1. Call open().
   - schedule a tasklet.
2. Tasklet is called.
   if (dev->rxq.qlen < RX_QLEN(dev)) {
	   - submit rx buffers util the number of
	     min(10, RX_QLEN(dev)). If the error
	     occurs, break the loop.
	   - If the dev->rxq.qlen < RX_QLEN(dev),
	     schedule the tasklet.
   }

Best Regards,
Hayes
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