linux-kernel - Re: [PATCH] net: usb: ax88179_178a: fix link status when link is set to down/up

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Message-ID: <20240613094546.508121-1-jtornosm@redhat.com>
Date: Thu, 13 Jun 2024 11:45:44 +0200
From: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
To: yongqin.liu@...aro.org
Cc: amit.pundir@...aro.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	inventor500@...aldi.net,
	jstultz@...gle.com,
	jtornosm@...hat.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	stable@...r.kernel.org,
	sumit.semwal@...aro.org
Subject: Re: [PATCH] net: usb: ax88179_178a: fix link status when link is set to down/up

Hello Yongqin,

After some research  and testing, it seems to happen that if initialization
is slower the second reset from open is needed too.
So, I have been working with some reproducers and I think I have the
solution for detecting when there is a problem.
If you can test it in your real environment that would be great.

Here the patch on the latest version of the file:
$ git diff drivers/net/usb/ax88179_178a.c
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 51c295e1e823..60357796be99 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -174,7 +174,6 @@ struct ax88179_data {
        u32 wol_supported;
        u32 wolopts;
        u8 disconnecting;
-       u8 initialized;
 };
 
 struct ax88179_int_data {
@@ -327,7 +326,8 @@ static void ax88179_status(struct usbnet *dev, struct urb *urb)
 
        if (netif_carrier_ok(dev->net) != link) {
                usbnet_link_change(dev, link, 1);
-               netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
+               if (!link)
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 51c295e1e823..60357796be99 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -174,7 +174,6 @@ struct ax88179_data {
        u32 wol_supported;
        u32 wolopts;
        u8 disconnecting;
-       u8 initialized;
 };
 
 struct ax88179_int_data {
@@ -327,7 +326,8 @@ static void ax88179_status(struct usbnet *dev, struct urb *urb)
 
        if (netif_carrier_ok(dev->net) != link) {
                usbnet_link_change(dev, link, 1);
-               netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
+               if (!link)
+                       netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
        }
 }
 
@@ -1543,6 +1543,7 @@ static int ax88179_link_reset(struct usbnet *dev)
                         GMII_PHY_PHYSR, 2, &tmp16);
 
        if (!(tmp16 & GMII_PHY_PHYSR_LINK)) {
+               netdev_info(dev->net, "ax88179 - Link status is: 0\n");
                return 0;
        } else if (GMII_PHY_PHYSR_GIGA == (tmp16 & GMII_PHY_PHYSR_SMASK)) {
                mode |= AX_MEDIUM_GIGAMODE | AX_MEDIUM_EN_125MHZ;
@@ -1580,6 +1581,8 @@ static int ax88179_link_reset(struct usbnet *dev)
 
        netif_carrier_on(dev->net);
 
+       netdev_info(dev->net, "ax88179 - Link status is: 1\n");
+
        return 0;
 }
 
@@ -1678,12 +1681,21 @@ static int ax88179_reset(struct usbnet *dev)
 
 static int ax88179_net_reset(struct usbnet *dev)
 {
-       struct ax88179_data *ax179_data = dev->driver_priv;
+       u16 tmp16;
 
-       if (ax179_data->initialized)
+       ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID, GMII_PHY_PHYSR,
+                        2, &tmp16);
+       if (tmp16) {
+               ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
+                                2, 2, &tmp16);
+               if (!(tmp16 & AX_MEDIUM_RECEIVE_EN)) {
+                       tmp16 |= AX_MEDIUM_RECEIVE_EN;
+                       ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
+                                         2, 2, &tmp16);
+               }
+       } else {
                ax88179_reset(dev);
-       else
-               ax179_data->initialized = 1;
+       }
 
        return 0;
 }

In addition, I have fixed the logs to show the link correclty.

If this is ok, I will submit the patch.

Thanks

Best regards
José Ignacio