From: Shivaji Kant <shivajikant@google.com>
Date: Mon, 6 Apr 2026 09:21:32 +0000 (+0000)
Subject: nvme: enable PCI P2PDMA support for RDMA transport
X-Git-Tag: v7.1-rc2~13^2~2^2~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23528aa3320a74b028e990b5a939fed32a8afc2f;p=thirdparty%2Fkernel%2Flinux.git

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 1ec6e867aedb..f77c960f7632 100644
--- 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,
 };
 
 /*