netdev - Re: [Q] How to invalidate ARP cache for a network device from within kernel

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Date:	Sat, 27 Nov 2010 03:25:43 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux1394-devel <linux1394-devel@...ts.sourceforge.net>
Subject: Re: [Q] How to invalidate ARP cache for a network device from
 within kernel

On Sat, 2010-11-27 at 02:18 +0100, Stefan Richter wrote:
> On Nov 26 Maxim Levitsky wrote:
> > However as soon as bus reset happens, the upper layer ARP cache isn't
> > invalidated, thus all attempts to send packets to remote node now fail,
> > because the additional information (node id and bus address) about
> > remote node is now invalid, but ARP core doesn't send ARP requests
> > because it has the response in the cache.
> 
> When is this a problem?  With nodes which stay on the bus (i.e. are
> present before and after the bus reset)?  Or with nodes which go away
> and come back much later (but before the old ARP cache entry was cleaned
> out)?
Its about later.
A node that disconnects and connects after 5 seconds for example or 20
seconds.
ARP timeout is I think 30 seconds or even more.

Btw I already solved that problem.
Patches attached.

With this and all great patches from you and Clemens, the firewire
networking strongly resembles ethernet in terms of speed and
reliability.
(When I resume from ram my desktop, connection restores after less that
5 seconds).

On laptop I still see few issues on s2ram cycle, I am tackling them now.

Best regards,
	Maxim Levitsky

View attachment "0001-firewire-net-restart-ISO-channel-on-bus-resets.patch" of type "text/x-patch" (1017 bytes)

View attachment "0002-NET-ARP-allow-to-invalidate-specific-ARP-entries.patch" of type "text/x-patch" (2602 bytes)

View attachment "0003-firewire-net-invalidate-ARP-entries-for-removed-node.patch" of type "text/x-patch" (1673 bytes)