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

Jose Ignacio Tornos Martinez
2024-06-13T09:46:02Z

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