linux-kernel - [RFC PATCH 09/25] NTB: ntb_transport: Support offsetted partial memory windows

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Message-ID: <20251023071916.901355-10-den@valinux.co.jp>
Date: Thu, 23 Oct 2025 16:19:00 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
	linux-pci@...r.kernel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
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Subject: [RFC PATCH 09/25] NTB: ntb_transport: Support offsetted partial memory windows

The NTB API functions ntb_mw_set_trans() and ntb_mw_get_align() now
support non-zero MW offsets. Update ntb_transport to make use of this
capability by propagating the offset when setting up MW translations.

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/ntb/ntb_transport.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 4bb1a64c1090..3f3bc991e667 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -877,13 +877,14 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
 	size_t xlat_size, buff_size;
 	resource_size_t xlat_align;
 	resource_size_t xlat_align_size;
+	resource_size_t offset;
 	int rc;
 
 	if (!size)
 		return -EINVAL;
 
 	rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align,
-			      &xlat_align_size, NULL, NULL);
+			      &xlat_align_size, NULL, &offset);
 	if (rc)
 		return rc;
 
@@ -918,7 +919,7 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
 
 	/* Notify HW the memory location of the receive buffer */
 	rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr,
-			      mw->xlat_size, 0);
+			      mw->xlat_size, offset);
 	if (rc) {
 		dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw);
 		ntb_free_mw(nt, num_mw);
-- 
2.48.1