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be2net: enable IOMMU pass through for be2net 

This patch sets the coherent DMA mask to 64-bit after the be2net driver has
been acknowledged that the system is 64-bit DMA capable. The coherent DMA
mask is examined by the Intel IOMMU driver to determine whether to allow
pass through context mapping for all devices. With this patch, the be2net
driver combined with be2net compatible hardware provides comparable
performance to the case where vt-d is disabled. The main use-case for this
change is to decrease the time necessary to copy virtual machine memory
during KVM live migration instantiations.

This patch was tested on a system that enables the IOMMU in non-coherent
mode. Two DMA remapper issues were encountered in the previous version and
both patches have been committed.
    commit ea2447f700
    commit 2e12bc29fc

Signed-off-by: Craig Hada <craig.hada@hp.com>
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Hada 2013-04-21 23:28:18 +00:00 committed by David S. Miller
parent a05f99db86
commit 2bd92cd2a5
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/emulex/benet/be_main.c
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@ -4134,6 +4134,11 @@ static int be_probe(struct pci_dev *pdev, const struct pci_device_id *pdev_id)
status = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
if (!status) {
status = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
if (status < 0) {
dev_err(&pdev->dev, "dma_set_coherent_mask failed\n");
goto free_netdev;
}
netdev->features |= NETIF_F_HIGHDMA;
} else {
status = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));