linux-kernel - [PATCH] igb: Add MII write support

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Date: Tue,  4 Jun 2024 15:10:20 +1200
From: jackie.jone@...iedtelesis.co.nz
To: davem@...emloft.net
Cc: jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	kuba@...nel.org,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chris.packham@...iedtelesis.co.nz,
	jackie.jone@...iedtelesis.co.nz
Subject: [PATCH] igb: Add MII write support

From: Jackie Jone <jackie.jone@...iedtelesis.co.nz>

To facilitate running PHY parametric tests, add support for the SIOCSMIIREG
ioctl. This allows a userspace application to write to the PHY registers
to enable the test modes.

Signed-off-by: Jackie Jone <jackie.jone@...iedtelesis.co.nz>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 03a4da6a1447..7fbfcf01fbf9 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -8977,6 +8977,10 @@ static int igb_mii_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 			return -EIO;
 		break;
 	case SIOCSMIIREG:
+		if (igb_write_phy_reg(&adapter->hw, data->reg_num & 0x1F,
+				     data->val_in))
+			return -EIO;
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}