netdev - Re: [patch 5/5] IPv6 to Intel EtherExpress 16 fails

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Message-ID: <482085EF.1040005@garzik.org>
Date:	Tue, 06 May 2008 12:23:11 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	akpm@...ux-foundation.org
CC:	netdev@...r.kernel.org, bns_robson@...mail.com
Subject: Re: [patch 5/5] IPv6 to Intel EtherExpress 16 fails - multicast problems

akpm@...ux-foundation.org wrote:
> From: Bruce Robson <bns_robson@...mail.com>
> 
> Taken from http://bugzilla.kernel.org/show_bug.cgi?id=10577
> 
> I was unable to access a computer containing an Intel EtherExpress 16 network
> card using IPv6.
> 
> I traced this to failure of neighbour discovery.  When I used an "ip -6 neigh
> add" command, on the computer attempting access, to insert a binding between
> the IPv6 address of the computer with the Intel EtherExpress 16 network card
> and the card's ethernet address, I was able to access that computer using
> IPv6.
> 
> Neighbour discovery requires working multicast.  The driver sources file
> eexpress.c contains an approximately 30 line function eexp_setup_filter used
> when loading multicast addresses.
> 
> I found 3 problems in this function
> 
> 1) It wrote the number of multicast addresses to the card instead of the
>     number of bytes in the multicast addresses.
> 
> 2) When loading multiple multicast addresses it loaded the first one
>     provided multiple times instead of loading each one once.
> 
> 3) The setting of pointer 'data' from 'dmi->dmi_addr' occured before the
>     test for the error situation of 'dmi' being NULL.
> 
> Correcting these problems allows the computer with the Intel EtherExpress 16
> network card to found by IPv6 neighbour discovery.
> 
> p.s. There is some information on the Intel EtherExpress 16 at
> http://www.intel.com/support/etherexpress/vintage/sb/cs-013500.htm
> Datasheet for the Intel 82586 ethernet controller used by the card
> http://www.datasheetcatalog.com/datasheets_pdf/8/2/5/8/82586.shtml
> 
> Signed-off-by: Bruce Robson <bns_robson@...mail.com>
> Cc: Jeff Garzik <jeff@...zik.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  drivers/net/eexpress.c |   11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)

applied


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