[PATCH V3 2/3] md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device

Chaitanya Kulkarni
2026-04-16T21:27:29Z

From: Kiran Kumar Modukuri <kmodukuri@nvidia.com>

MD RAID does not propagate BLK_FEAT_PCI_P2PDMA from member devices to
the RAID device, preventing peer-to-peer DMA through the RAID layer even
when all underlying devices support it.

Enable BLK_FEAT_PCI_P2PDMA unconditionally in raid0, raid1 and raid10
personalities during queue limits setup. blk_stack_limits() clears it
automatically if any member device lacks support, consistent with how
BLK_FEAT_NOWAIT and BLK_FEAT_POLL are handled in the block core.

Parity RAID personalities (raid4/5/6) are excluded because they require
CPU access to data pages for parity computation, which is incompatible
with P2P mappings.

Tested with RAID0/1/10 arrays containing multiple NVMe devices with
P2PDMA support, confirming that peer-to-peer transfers work correctly
through the RAID layer.

Signed-off-by: Kiran Kumar Modukuri <kmodukuri@nvidia.com>
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
---
drivers/md/raid0.c | 1 +
drivers/md/raid1.c | 1 +
drivers/md/raid10.c | 1 +
3 files changed, 3 insertions(+)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 5e38a51e349a..2cdaf7495d92 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -392,6 +392,7 @@ static int raid0_set_limits(struct mddev *mddev)
lim.io_opt = lim.io_min * mddev->raid_disks;
lim.chunk_sectors = mddev->chunk_sectors;
lim.features |= BLK_FEAT_ATOMIC_WRITES;
+ lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index ba91f7e61920..422ad4786569 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3215,6 +3215,7 @@ static int raid1_set_limits(struct mddev *mddev)
lim.max_hw_wzeroes_unmap_sectors = 0;
lim.logical_block_size = mddev->logical_block_size;
lim.features |= BLK_FEAT_ATOMIC_WRITES;
+ lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 4901ebe45c87..07a5b734c8f3 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3939,6 +3939,7 @@ static int raid10_set_queue_limits(struct mddev *mddev)
lim.chunk_sectors = mddev->chunk_sectors;
lim.io_opt = lim.io_min * raid10_nr_stripes(conf);
lim.features |= BLK_FEAT_ATOMIC_WRITES;
+ lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
--
2.39.5