> Fatal DMA error! Please use 'swiotlb=force'
> ----------- cut here --------- please bite here ---------
> Kernel BUG at arch/x86_64/kernel/../../i386/kernel/pci-dma-xen.c:333
What is this bug being caused by? That is, what is line 333 of
pci-dma-xen.c in your source tree?
> RIP: e030:<ffffffff802104d2> <ffffffff802104d2> dma_map_single+0x13f/0x18f
> <ffffffff883179cf> :ib_ipoib:ipoib_cm_alloc_rx_skb+0x92/0x282
The code that calls dma_map_single in ipoib_cm_alloc_rx_skb() looks
fine to me, at least in the upstream kernel (I don't know what extra
patches OFED might add on). It is basically:
skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
skb_reserve(skb, 12);
mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
DMA_FROM_DEVICE);
and I don't see anything at all wrong with with that.
- R.
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