netdev - Re: Strange network timeouts w/ 2.6.30.5

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Message-ID: <20090823191808.GA29972@linux-gec2.site>
Date:	Sun, 23 Aug 2009 22:18:08 +0300
From:	Aviv Greenberg <avivgnet@...il.com>
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	Walt Holman <walt@...mansrus.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Strange network timeouts w/ 2.6.30.5

On Thu, Aug 20, 2009 at 03:45:21PM +0200, Krzysztof Halasa wrote:
 
> Signed-off-by: Krzysztof Hałasa <khc@...waw.pl>
> 
> diff --git a/drivers/net/e100.c b/drivers/net/e100.c
> index 014dfb6..b610088 100644
> --- a/drivers/net/e100.c
> +++ b/drivers/net/e100.c
> @@ -1762,9 +1762,12 @@ static int e100_rx_indicate(struct nic *nic, struct rx *rx,
>  
>  			if (ioread8(&nic->csr->scb.status) & rus_no_res)
>  				nic->ru_running = RU_SUSPENDED;
> +#ifndef CONFIG_X86
> +		/* FIXME interferes with swiotlb. */
>  		pci_dma_sync_single_for_device(nic->pdev, rx->dma_addr,
>  					       sizeof(struct rfd),
>  					       PCI_DMA_BIDIRECTIONAL);
> +#endif
>  		return -ENODATA;
>  	}
>  
> -- 

Why do you use PCI_DMA_BIDIRECTIONAL? From what i get, the device writes and the
cpu reads - so the direction should be PCI_DMA_FROMDEVICE. Maybe just maybe the 
bi-directionality bites you in the swiotlb case.

> Krzysztof Halasa
> --
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