[PATCH 1/4] vdpa/octeon_ep: Fix PF->VF mailbox data address calculation

[Srujana Challa <schalla@marvell.com>]

The mailbox address was computed assuming 1 ring per VF. Read the
actual rings-per-VF from OCTEP_EPF_RINFO and use it when calculating
OCTEP_PF_MBOX_DATA offsets, fixing VF initialization when rings
per VF > 1.

Fixes: 8b6c724cdab8 ("virtio: vdpa: vDPA driver for Marvell OCTEON DPU devices")
Signed-off-by: Srujana Challa <schalla@marvell.com>
---
 drivers/vdpa/octeon_ep/octep_vdpa_main.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/octeon_ep/octep_vdpa_main.c b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
index 31a02e7fd7f2..9946480ee704 100644
--- a/drivers/vdpa/octeon_ep/octep_vdpa_main.c
+++ b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (C) 2024 Marvell. */
 
+#include <linux/bitfield.h>
 #include <linux/interrupt.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/module.h>
@@ -722,6 +723,8 @@ static int octep_sriov_enable(struct pci_dev *pdev, int num_vfs)
 	bool done = false;
 	int index = 0;
 	int ret, i;
+	u8 rpvf;
+	u64 val;
 
 	ret = pci_enable_sriov(pdev, num_vfs);
 	if (ret)
@@ -741,9 +744,11 @@ static int octep_sriov_enable(struct pci_dev *pdev, int num_vfs)
 		}
 	}
 
+	val = readq(addr + OCTEP_EPF_RINFO(0));
+	rpvf = FIELD_GET(GENMASK_ULL(35, 32), val);
 	if (done) {
 		for (i = 0; i < pf->enabled_vfs; i++)
-			writeq(OCTEP_DEV_READY_SIGNATURE, addr + OCTEP_PF_MBOX_DATA(i));
+			writeq(OCTEP_DEV_READY_SIGNATURE, addr + OCTEP_PF_MBOX_DATA(i * rpvf));
 	}
 
 	return num_vfs;
-- 
2.25.1