netdev - Re: [PATCH] e1000: fix loss of multicast packets

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Date:	Sat, 04 Apr 2009 16:37:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	jesse.brandeburg@...el.com, daveboutcher@...il.com
Subject: Re: [PATCH] e1000: fix loss of multicast packets

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Thu, 02 Apr 2009 19:00:32 -0700

> e1000 (and e1000e, igb, ixgbe, ixgb) all do a series of
> operations each time a multicast address is added.  The flow goes
> something like
> 
> 1) stack adds one multicast address
> 2) stack passes whole current list of unicast and multicast
>    addresses to driver
> 3) driver clears entire list in hardware
> 4) driver programs each multicast address using iomem in a loop
> 
> This was causing multicast packets to be lost during the
> reprogramming process.
> 
> reference with test program:
> http://kerneltrap.org/mailarchive/linux-netdev/2009/3/14/5160514/thread
> 
> Thanks to Dave Boutcher for his report and test program.
> 
> This driver fix prepares an array all at once in memory and
> programs it in one shot to the hardware, not requiring an "erase"
> cycle.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied, thanks.
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