Re: Broadcom Gigabit 5703 and Bridging

On Wed, Jan 08, 2003 at 02:52:37PM +1030, Paul Schulz wrote:
> Greetings,
> 
> I'm seeing 'TCP Checksum' Errors after packets pass through a host
> bridging TCP packets with:
> 
>  - Kernel 2.4.20
>  - Bridge code
>  - tg3 (Broadcom Gigabit 5703)
> 
>    eth0: Tigon3 [partno(BCM95703A30) rev 1002 PHY(5703)]
>     (PCIX:100MHz:64-bit) 10/100/1000BaseT
>   (eth1 is similar)

The BCM95703A30 rev 1002 has issues with the hardware checksumming.

The following patch for the tg3 (linux-2.4.20-ac2/drivers/net/tg3.c)
driver, fixes the problem.

Note: I've tested this on the 2.4.20-ac2, but it should work OK with
2.4.20 too.

diff -u linux-2.4.20/drivers/net/tg3.c linux-2.4.20-ac2/drivers/net/tg3.c
--- linux-2.4.20/drivers/net/tg3.c	Fri Nov 29 10:23:14 2002
+++ linux-2.4.20-ac2/drivers/net/tg3.c	Wed Jan  8 14:34:44 2003
@@ -6161,6 +6161,10 @@
 	if (tp->pci_chip_rev_id == CHIPREV_ID_5700_B0)
 		tp->tg3_flags |= TG3_FLAG_BROKEN_CHECKSUMS;
 
+	/* 5703 A2 have issues with checksumming too. (sarah) */
+	if (tp->pci_chip_rev_id == CHIPREV_ID_5703_A2)
+		tp->tg3_flags |= TG3_FLAG_BROKEN_CHECKSUMS;
+
 	/* Regardless of whether checksums work or not, we configure
 	 * the StrongARM chips to not compute the pseudo header checksums
 	 * in either direction.  Because of the way Linux checksum support

Cheers,
Sarah Bolderoff
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