[PATCH v3 11/20] RDMA/core: introduce ib_dma_pci_p2p_dma_supported()

[Max Gurtovoy]

Logan,

On 9/17/2021 2:40 AM, Logan Gunthorpe wrote:
> Introduce the helper function ib_dma_pci_p2p_dma_supported() to check
> if a given ib_device can be used in P2PDMA transfers. This ensures
> the ib_device is not using virt_dma and also that the underlying
> dma_device supports P2PDMA.
>
> Use the new helper in nvme-rdma to replace the existing check for
> ib_uses_virt_dma(). Adding the dma_pci_p2pdma_supported() check allows
> switching away from pci_p2pdma_[un]map_sg().
>
> Signed-off-by: Logan Gunthorpe <logang at deltatee.com>
> ---
>   drivers/nvme/target/rdma.c |  2 +-
>   include/rdma/ib_verbs.h    | 11 +++++++++++
>   2 files changed, 12 insertions(+), 1 deletion(-)

Looks good,

Reviewed-by: Max Gurtovoy <mgurtovoy at nvidia.com>