diff options
| author | Craig Hada <craig.hada@hp.com> | 2013-04-21 23:28:18 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-22 15:36:06 -0400 |
| commit | 2bd92cd2a5f96458519ed4cbbf90d9bd108edcc6 (patch) | |
| tree | 2e43c920662b1427f84f3ed4663a7db77f1039fc /drivers/net/ethernet/emulex | |
| parent | a05f99db86e6a57265890de1c9c7d748c3b25667 (diff) | |
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 ea2447f700cab264019b52e2b417d689e052dcfd
commit 2e12bc29fc5a12242d68e11875db3dd58efad9ff
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>
Diffstat (limited to 'drivers/net/ethernet/emulex')
| -rw-r--r-- | drivers/net/ethernet/emulex/benet/be_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c index e773fbaf8d02..21808680b91f 100644 --- a/drivers/net/ethernet/emulex/benet/be_main.c +++ b/drivers/net/ethernet/emulex/benet/be_main.c @@ -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)); |