Re: [PATCH 09/14] net: axienet: Add mii-tool support

On Mon, 13 Jan 2020 06:12:10 +0000
Radhey Shyam Pandey [off-list ref] wrote:

Hi,

(sorry, forgot to send this out before posting v2)

quoted

-----Original Message-----
From: Andre Przywara <andre.przywara@arm.com>
Sent: Friday, January 10, 2020 5:24 PM
To: David S . Miller <davem@davemloft.net>; Radhey Shyam Pandey
[off-list ref]
Cc: Michal Simek <redacted>; Robert Hancock
[off-list ref]; netdev@vger.kernel.org; linux-arm-
kernel@lists.infradead.org; linux-kernel@vger.kernel.org
Subject: [PATCH 09/14] net: axienet: Add mii-tool support

mii-tool is useful for debugging, and all it requires to work is to wire
up the ioctl ops function pointer.
Add this to the axienet driver to enable mii-tool.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c

b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 7a747345e98e..64f799f3d248 100644

--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c

@@ -1152,6 +1152,16 @@ static void axienet_poll_controller(struct net_device

*ndev)
 }
 #endif

+static int axienet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct axienet_local *lp = netdev_priv(dev);
+
+	if (!netif_running(dev))
+		return -EINVAL;  

I think phy ioctl should be allowed even if the device is not up. 
Or is there any specific reason for keeping it?

I found that some of the drivers check this (macb, stmmac), while others (dpaa2, mvneta, mvpp2, mtk_eth) don't. I don't know the reasons for that, so I play safe here.
Happy to change this if someone provides some rationale.

Cheers,
Andre.

quoted

+
+	return phylink_mii_ioctl(lp->phylink, rq, cmd);
+}
+
 static const struct net_device_ops axienet_netdev_ops = {
 	.ndo_open = axienet_open,
 	.ndo_stop = axienet_stop,

@@ -1159,6 +1169,7 @@ static const struct net_device_ops

axienet_netdev_ops = {
 	.ndo_change_mtu	= axienet_change_mtu,
 	.ndo_set_mac_address = netdev_set_mac_address,
 	.ndo_validate_addr = eth_validate_addr,
+	.ndo_do_ioctl = axienet_ioctl,
 	.ndo_set_rx_mode = axienet_set_multicast_list,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = axienet_poll_controller,
--
2.17.1