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@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@nvidia.com>