Shay Agroskin a447dbb44d net: ena: set initial DMA width to avoid intel iommu issue ... [ Upstream commit 09323b3bca ] The ENA driver uses the readless mechanism, which uses DMA, to find out what the DMA mask is supposed to be. If DMA is used without setting the dma_mask first, it causes the Intel IOMMU driver to think that ENA is a 32-bit device and therefore disables IOMMU passthrough permanently. This patch sets the dma_mask to be ENA_MAX_PHYS_ADDR_SIZE_BITS=48 before readless initialization in ena_device_init()->ena_com_mmio_reg_read_request_init(), which is large enough to workaround the intel_iommu issue. DMA mask is set again to the correct value after it's received from the device after readless is initialized. The patch also changes the driver to use dma_set_mask_and_coherent() function instead of the two pci_set_dma_mask() and pci_set_consistent_dma_mask() ones. Both methods achieve the same effect. Fixes: 1738cd3ed3 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Mike Cui <mikecui@amazon.com> Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com> Signed-off-by: Shay Agroskin <shayagr@amazon.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-12-02 08:49:52 +01:00
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ena	net: ena: set initial DMA width to avoid intel iommu issue	2020-12-02 08:49:52 +01:00
Kconfig	net: ena: Select DIMLIB for ENA_ETHERNET	2019-09-22 14:05:18 -07:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00