linux-kernel - Re: uli526x hangs on 2.6.29, not on rc8

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Date:	Fri, 27 Mar 2009 00:35:49 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Santiago Garcia Mantinan <manty@...ty.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: uli526x hangs on 2.6.29, not on rc8

Santiago Garcia Mantinan a écrit :
> Hi!
> 
> After upgrading from rc8 to final 2.6.29 my machine's network stops working
> after some full speed (100Mb/s) downloads ifdown;ifup, or powering off the
> switch won't solve the problem, however it is solved if I unload the driver
> module and load it again. Tested with another NIC (e1000e based) and
> couldn't reproduce the problem.
> 
> This is happening on final 2.6.29 version but doesn't seem to happen on rc8
> with the same kernel config. Machine is a AMD Athlon 64 running Debian 64
> bits.
> 
> I don't see any changes on the git for uli526x from rc8 to final, but the
> tulip driver on which this one is based had some changes.
> 
> Don't know what else to add, just ask me for whatever data that may help on
> this.
> 
> Regards...

Hi

This is a known problem, and a fix should be available very soon for 2.6.29.1

http://www.spinics.net/lists/netdev/msg92829.html

You can check net/core/dev.c function process_backlog() should get this
updated version :

static int process_backlog(struct napi_struct *napi, int quota)
{
	int work = 0;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	unsigned long start_time = jiffies;

	napi->weight = weight_p;
	do {
		struct sk_buff *skb;

		local_irq_disable();
		skb = __skb_dequeue(&queue->input_pkt_queue);
		if (!skb) {
			list_del(&napi->poll_list);
			clear_bit(NAPI_STATE_SCHED, &napi->state);
			local_irq_enable();
			break;
		}
		local_irq_enable();

		napi_gro_receive(napi, skb);
	} while (++work < quota && jiffies == start_time);

	napi_gro_flush(napi);

	return work;
}


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