[LU-17039] Cleanup solution for broken Mellanox ib_dma_map_sg()

Fri, 1 Sep 2023 03:27:22 +0000

Currently the solution to open code the inline function: ib_dma_map_sg() can be simplified by #undef CONFIG_INFINIBAND_VIRT_DMA in the case where a broken ib_dma_map_sg() is discovered.

CONFIG_INFINIBAND_VIRT_DMA is a kernel configuration option that in some cases
conflicts with the configuration of the externally provided OFED stack.

The #undef CONFIG_INFINIBAND_VIRT_DMA should be restricted to broken implementations [MOFED/OPA] and only when building against the external stack.

An in-kernel broken ib_dma_map_sg suggests that the kernel is badly misconfigured and not a Lustre specific problem.

Whamcloud Community JIRA

[LU-17039] Cleanup solution for broken Mellanox ib_dma_map_sg()