Message-ID: <4000607D.1020102@attika.ath.cx>
Date: Sat, 10 Jan 2004 21:28:45 +0100
From: Piotr Kaczuba <pepe@attika.ath.cx>
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To: Jeff Garzik <jgarzik@pobox.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: tulip driver: errors instead TX packets?
References: <20040110144831.GA16080@orbiter.attika.ath.cx> <400035F5.3040300@pobox.com>
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Jeff Garzik wrote:
> Piotr Kaczuba wrote:
> 
>> I've got a ADMtek Centaur (3cSOHO100B-TX) running with the tulip 
>> driver  on 2.6.1. I wonder if anyone has noticed that ifconfig shows 
>> the  packets sent in the errors field instead of the TX packets field. 
>> At  least, this is what I assume because it shows 0 TX packets and 
>> 11756  errors.
> 
> This is an old error, but since packets show up, nobody bothers with the 
> incorrect statistics...

It seems that the error lies in the following piece of code from 
drivers/net/tulip/interrupt.c, function tulip_interrupt. I've inserted 
an additional printk after the "if (status & 0x8000)" and it looks like 
normal operation of the nic is considered as an major error by the 
driver because my printk appeared in dmesg output right after bringing 
the interface up. I assume that the else branch is never executed 
although I didn't test what happens if an transmit error really happens. 
I wonder if a fix for this problem consists of just changing the value 
of the AND mask but I have no idea what the right value would be.


   if (status & 0x8000) {
           /* There was an major error, log it. */
#ifndef final_version
           if (tulip_debug > 1)
              printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
                        dev->name, status);
#endif
           tp->stats.tx_errors++;
           if (status & 0x4104) tp->stats.tx_aborted_errors++;
           if (status & 0x0C00) tp->stats.tx_carrier_errors++;
           if (status & 0x0200) tp->stats.tx_window_errors++;
           if (status & 0x0002) tp->stats.tx_fifo_errors++;
           if ((status & 0x0080) && tp->full_duplex == 0)
                   tp->stats.tx_heartbeat_errors++;
   } else {
           tp->stats.tx_bytes +=
                   tp->tx_buffers[entry].skb->len;
           tp->stats.collisions += (status >> 3) & 15;
           tp->stats.tx_packets++;
   }


Piotr Kaczuba
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