netdev - Re: Problem with sockets an 2.6.21-rc5 kernel

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Date:	Tue, 27 Mar 2007 18:46:59 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Jose Alberto Reguero <jareguero@...efonica.net>
Cc:	netdev@...r.kernel.org, Jay Cliburn <jacliburn@...lsouth.net>
Subject: Re: Problem with sockets an 2.6.21-rc5 kernel

On Tue, Mar 27, 2007 at 04:29:11PM +0200, Jose Alberto Reguero (jareguero@...efonica.net) wrote:
> El Martes, 27 de Marzo de 2007, Evgeniy Polyakov escribió:
> > On Mon, Mar 26, 2007 at 11:03:21PM +0200, Jose Alberto Reguero 
> (jareguero@...efonica.net) wrote:
> > > I had two python programs, server.py and client.py(attached)
> > >
> > > With server.py in  a kernel 2.6.21-rc5 x86_64 and client.py in the same
> > > machine,  server.py get the message.
> > >
> > > With server.py in  a kerner 2.6.21-rc5 x86_64 and client.py in another
> > > machine, server.py don't get the message.
> > >
> > > The same with the programs in c(attached).
> > >
> > > With kernel 2.6.20.3 the programs work well.
> > >
> > > There are something wrong in the programs?
> >
> > Besides full absence of error checks and coding style issues it does not
> > seem to contain errors.
> >
> > And, btw, C program work with 2.6.21-rc5 (git tree
> > e0f2e3a06be513352cb4955313ed7e55909acd84) on x86_64.
> >
> > server.c application compiled with Debian 4.1.1-21 compiler on x86_64
> > sucessfully received message from 2.6.18-3 machine.
> 
> Thanks. I thought it was a kernel BUG. It is a alt1 driver BUG(Attansic(R) L1 
> Ethernet Network Driver). The error happens with the atl1 driver that comes 
> with kernel 2.6.21-rc5. With he original driver from ASUS for M2V motherboard 
> modified to compile with kernel 2.6.21-rc5 there is no problems.

Did it work with in-kernel driver?
There is only one remotely related change in the driver:

-	mta = ioread32((hw + REG_RX_HASH_TABLE) + (hash_reg << 2));
+	mta = ioread32((hw->hw_addr + REG_RX_HASH_TABLE) + (hash_reg << 2));

If it worked before, then spurious ioread() from outside of our
univercity could lead to good/bad mta value (likely zero or ~0), so appropriate 
multicast list update could succeed.

If your programs never worked with this new driver, then it can not be
easily solved without hardware specifications.

I added Jay Cliburn who submitted the driver to Cc list.

> Jose Alberto

-- 
	Evgeniy Polyakov
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