netdev - Re: Strange network timeouts w/ 2.6.30.5

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Date:	Thu, 20 Aug 2009 15:45:21 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Walt Holman <walt@...mansrus.com>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Strange network timeouts w/ 2.6.30.5

Walt Holman <walt@...mansrus.com> writes:

> dmesg is attached. This box does have >2GB Ram (6GB total).  The dmesg
> will show e100 init'd 3 times since the first is the stock modprobe,
> 2nd was forced with use_io and the 3rd modprobe was after reverting
> the patch.

You most probably can't test without swiotlb (RAM has to be limited to
2 GB or so), can you? That would (dis)prove my theory. Alternatively (or
better), a test on IOMMU-equipped system would do.

Since swiotlb is x86-only thing (though other 64-bit archs may have
something similar), I think the correct work around is to enable the
"for_device" handoff on !X86.

Something like maybe:

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;
 	}
 
-- 
Krzysztof Halasa
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