kmod/vdpa: use lower 4-bytes for signature

The upper 4-bytes are reserved by the firmware for
storing meta data. Use only lower 4-bytes to update
the signature details.

Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
Change-Id: I9f8a9d7c783e7849d00f623e49822ca0d02f48cc
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/dataplane/dpu-offload/+/143087
Tested-by: sa_ip-toolkits-Jenkins <sa_ip-toolkits-jenkins@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
Reviewed-by: Shijith Thotton <sthotton@marvell.com>

kmod/vdpa/octeon_ep/octep_vdpa_main.c

@@ -603,10 +603,10 @@ static const struct vdpa_mgmtdev_ops octep_vdpa_mgmt_dev_ops = {
 
 static bool get_device_ready_status(u8 __iomem *addr)
 {
-	u64 signature = readq(addr + OCTEP_VF_MBOX_DATA(0));
+	u32 signature = readl(addr + OCTEP_VF_MBOX_DATA(0));
 
 	if (signature == OCTEP_DEV_READY_SIGNATURE) {
-		writeq(0, addr + OCTEP_VF_MBOX_DATA(0));
+		writel(0, addr + OCTEP_VF_MBOX_DATA(0));
 		return true;
 	}
 
@@ -777,7 +777,7 @@ static int octep_sriov_enable(struct pci_dev *pdev, int num_vfs)
 	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 * rpvf));
+			writel(OCTEP_DEV_READY_SIGNATURE, addr + OCTEP_PF_MBOX_DATA(i * rpvf));
 	}
 
 	return num_vfs;