nvme: enable PCI P2PDMA support for RDMA transport

Enable BLK_FEAT_PCI_P2PDMA on the NVMe when the underlying
RDMA controller supports it.

Suggested-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Henrique Carvalho <henrique.carvalho@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Shivaji Kant <shivajikant@google.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 1ec6e867aedb634e0ed5ff7517bf4cee9c2ace24..f77c960f7632d19db46d8954751bd7fb6670febe 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2189,6 +2189,13 @@ out_fail:
        nvme_rdma_reconnect_or_remove(ctrl, ret);
 }
 
+static bool nvme_rdma_supports_pci_p2pdma(struct nvme_ctrl *ctrl)
+{
+       struct nvme_rdma_ctrl *r_ctrl = to_rdma_ctrl(ctrl);
+
+       return ib_dma_pci_p2p_dma_supported(r_ctrl->device->dev);
+}
+
 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
        .name                   = "rdma",
        .module                 = THIS_MODULE,
@@ -2203,6 +2210,7 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
        .get_address            = nvmf_get_address,
        .stop_ctrl              = nvme_rdma_stop_ctrl,
        .get_virt_boundary      = nvme_get_virt_boundary,
+       .supports_pci_p2pdma    = nvme_rdma_supports_pci_p2pdma,
 };
 
 /*