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    SubjectRe: Strange network timeouts w/ 2.6.30.5

    ----- "Krzysztof Halasa" <khc@pm.waw.pl> wrote:

    > Walt Holman <walt@holmansrus.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.

    Would something like passing a mem=xx cmdline on x86_64 be sufficient to test this?

    -Walt



    >
    > 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@pm.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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