RE: Kernel Oops when receiving a lot of UDP packets while booting

Hi,

I have verified that I am getting packets over the ethernet
before the scc_enet_open() is called, I somehow suspect that
this might be causing my random crashes.

I inserted the following in enet.c

static int opened = 0

and in scc_enet_open() I put

opened = 1;

and in scc_enet_interrupt() I put

if(opened == 0)
	printk("ETHO IRQ before open\n");

How do you propose to that the initialization is done to prevent this?

I have tried simply to move

sccp->scc_gmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);

from scc_enet_init() to scc_enet_open() both before and after the
netif_start_queue()
call. But it only makes thing worse.

Thanks,

K.D.

-----Original Message-----
From: Peter Desnoyers [mailto:pdesnoyers@chinook.com]
Sent: 28. desember 2001 16:10
To: LEROY Christophe
Cc: linuxppc
Subject: Re: Kernel Oops when receiving a lot of UDP packets while
booting



LEROY Christophe wrote:

quoted

What is HHL2.0 ?

Montevista hardhat linux 2.0.  A couple of days ago someone had an
ethernet question about that, and I was confused.

quoted

I'm using the official 2.4.16 kernel from kernel.org with

the ppc ports

quoted

patch for 2.4.15.
I'm not using FEC but MC68160A (that is enet.c). But that's

probably the

quoted

same problem.
Any idea how to solve the problem ?

Check to make sure that ethernet packet reception is disabled when you
leave the init() function, and doesn't get enabled until the _open()
function is called.  You might have to actually do work to
disable it if
the bootloader already enabled things...

First you could use some flags and printks to see whether the crash is
really due to early packets, as I suspect.

--
.....................................................................
 Peter Desnoyers            (781) 457-1165   pdesnoyers@chinook.com
 Chinook Communications     (617) 661-1979   pjd@fred.cambridge.ma.us
 100 Hayden Ave, Lexington MA 02421

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

I have verified that I am getting packets over the ethernet
before the scc_enet_open() is called, I somehow suspect that
this might be causing my random crashes.

You just kludge it by looking at your 'opened' flag and dropping the
packet in scc_enet_rx if it's false.  If it stops the crashes, you'll be
OK until you find a version of the driver that doesn't have this
problem.

The version of the driver I use does all the hardware initialization in
scc_enet_init, and then all that scc_enet_open does is call
netif_start_queue.

--
.....................................................................
 Peter Desnoyers            (781) 457-1165   pdesnoyers@chinook.com
 Chinook Communications     (617) 661-1979   pjd@fred.cambridge.ma.us
 100 Hayden Ave, Lexington MA 02421

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/