On Wed, 2013-09-18 at 13:00 +0400, Igor Gnatenko wrote:
> Since 136d8f377e1575463b47840bc5f1b22d94bf8f63 commit we have kernel
> panic on:
[...]
At a first glance, it looks like this bit is wrong:
> @@ -3058,13 +3090,17 @@ static struct sk_buff *skge_rx_get(struct net_device
> *dev,
> if (!nskb)
> goto resubmit;
>
> + if (skge_rx_setup(skge, e, nskb, skge->rx_buf_size) < 0) {
> + dev_kfree_skb(nskb);
> + goto resubmit;
> + }
> +
> pci_unmap_single(skge->hw->pdev,
> dma_unmap_addr(e, mapaddr),
> dma_unmap_len(e, maplen),
> PCI_DMA_FROMDEVICE);
> skb = e->skb;
> prefetch(skb->data);
> - skge_rx_setup(skge, e, nskb, skge->rx_buf_size);
> }
>
> skb_put(skb, len);
That pci_unmap_single() appears to unmap the *new*, rather than old, DMA
mapping. I think you need to copy out the old DMA address and length
before doing skge_rx_setup().
Try it with an IOMMU in strict mode (intel_iommu=on,strict or
amd_iommu=fullflush).
Ben.
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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