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Date: Tue, 26 Jul 2022 12:33:19 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>
Cc: kernel@...gutronix.de, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, Lukas Wunner <lukas@...ner.de>,
Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next v1 1/2] net: asix: ax88772: migrate to phylink
On Sat, 2022-07-23 at 19:47 +0200, Oleksij Rempel wrote:
> There are some exotic ax88772 based devices which may require
> functionality provide by the phylink framework. For example:
> - US100A20SFP, USB 2.0 auf LWL Converter with SFP Cage
> - AX88772B USB to 100Base-TX Ethernet (with RMII) demo board, where it
> is possible to switch between internal PHY and external RMII based
> connection.
>
> So, convert this driver to phylink as soon as possible.
>
> Tested with:
> - AX88772A + internal PHY
> - AX88772B + external DP83TD510E T1L PHY
>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
> drivers/net/usb/Kconfig | 2 +-
> drivers/net/usb/asix.h | 3 +
> drivers/net/usb/asix_devices.c | 123 ++++++++++++++++++++++++++++-----
> 3 files changed, 110 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
> index e62fc4f2aee0..3d46b5f9287a 100644
> --- a/drivers/net/usb/Kconfig
> +++ b/drivers/net/usb/Kconfig
> @@ -168,7 +168,7 @@ config USB_NET_AX8817X
> tristate "ASIX AX88xxx Based USB 2.0 Ethernet Adapters"
> depends on USB_USBNET
> select CRC32
> - select PHYLIB
> + select PHYLINK
> select AX88796B_PHY
> imply NET_SELFTESTS
> default y
> diff --git a/drivers/net/usb/asix.h b/drivers/net/usb/asix.h
> index 21c1ca275cc4..74162190bccc 100644
> --- a/drivers/net/usb/asix.h
> +++ b/drivers/net/usb/asix.h
> @@ -27,6 +27,7 @@
> #include <linux/if_vlan.h>
> #include <linux/phy.h>
> #include <net/selftests.h>
> +#include <linux/phylink.h>
>
> #define DRIVER_VERSION "22-Dec-2011"
> #define DRIVER_NAME "asix"
> @@ -185,6 +186,8 @@ struct asix_common_private {
> struct mii_bus *mdio;
> struct phy_device *phydev;
> struct phy_device *phydev_int;
> + struct phylink *phylink;
> + struct phylink_config phylink_config;
> u16 phy_addr;
> bool embd_phy;
> u8 chipcode;
> diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
> index 5b5eb630c4b7..3f93bc46a7eb 100644
> --- a/drivers/net/usb/asix_devices.c
> +++ b/drivers/net/usb/asix_devices.c
> @@ -327,6 +327,12 @@ static int ax88772_reset(struct usbnet *dev)
> struct asix_common_private *priv = dev->driver_priv;
> int ret;
>
> + ret = phylink_connect_phy(priv->phylink, priv->phydev);
> + if (ret) {
> + netdev_err(dev->net, "Could not connect PHY\n");
> + return ret;
> + }
Don't you need to additionally call phylink_disconnect_phy() in later
error paths? why?
> +
> /* Rewrite MAC address */
> ether_addr_copy(data->mac_addr, dev->net->dev_addr);
> ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0,
> @@ -343,7 +349,7 @@ static int ax88772_reset(struct usbnet *dev)
> if (ret < 0)
> goto out;
>
> - phy_start(priv->phydev);
> + phylink_start(priv->phylink);
>
> return 0;
>
> @@ -590,8 +596,11 @@ static void ax88772_suspend(struct usbnet *dev)
> struct asix_common_private *priv = dev->driver_priv;
> u16 medium;
>
> - if (netif_running(dev->net))
> - phy_stop(priv->phydev);
> + if (netif_running(dev->net)) {
> + rtnl_lock();
> + phylink_suspend(priv->phylink, false);
> + rtnl_unlock();
> + }
>
> /* Stop MAC operation */
> medium = asix_read_medium_status(dev, 1);
> @@ -622,8 +631,11 @@ static void ax88772_resume(struct usbnet *dev)
> if (!priv->reset(dev, 1))
> break;
>
> - if (netif_running(dev->net))
> - phy_start(priv->phydev);
> + if (netif_running(dev->net)) {
> + rtnl_lock();
> + phylink_resume(priv->phylink);
> + rtnl_unlock();
> + }
> }
>
> static int asix_resume(struct usb_interface *intf)
> @@ -659,7 +671,6 @@ static int ax88772_init_mdio(struct usbnet *dev)
> static int ax88772_init_phy(struct usbnet *dev)
> {
> struct asix_common_private *priv = dev->driver_priv;
> - int ret;
>
> priv->phydev = mdiobus_get_phy(priv->mdio, priv->phy_addr);
> if (!priv->phydev) {
> @@ -667,13 +678,6 @@ static int ax88772_init_phy(struct usbnet *dev)
> return -ENODEV;
> }
>
> - ret = phy_connect_direct(dev->net, priv->phydev, &asix_adjust_link,
> - PHY_INTERFACE_MODE_INTERNAL);
> - if (ret) {
> - netdev_err(dev->net, "Could not connect PHY\n");
> - return ret;
> - }
> -
> phy_suspend(priv->phydev);
> priv->phydev->mac_managed_pm = 1;
>
> @@ -698,6 +702,89 @@ static int ax88772_init_phy(struct usbnet *dev)
> return 0;
> }
>
> +static void ax88772_mac_config(struct phylink_config *config, unsigned int mode,
> + const struct phylink_link_state *state)
> +{
> + /* Nothing to do */
> +}
> +
> +static void ax88772_mac_link_down(struct phylink_config *config,
> + unsigned int mode, phy_interface_t interface)
> +{
> + struct usbnet *dev = netdev_priv(to_net_dev(config->dev));
> +
> + asix_write_medium_mode(dev, 0, 0);
> + usbnet_link_change(dev, false, false);
> +}
> +
> +static void ax88772_mac_link_up(struct phylink_config *config,
> + struct phy_device *phy,
> + unsigned int mode, phy_interface_t interface,
> + int speed, int duplex,
> + bool tx_pause, bool rx_pause)
> +{
> + struct usbnet *dev = netdev_priv(to_net_dev(config->dev));
> + u16 m = AX_MEDIUM_AC | AX_MEDIUM_RE;
> +
> + m |= duplex ? AX_MEDIUM_FD : 0;
> +
> + switch (speed) {
> + case SPEED_100:
> + m |= AX_MEDIUM_PS;
> + break;
> + case SPEED_10:
> + break;
> + default:
> + return;
> + }
> +
> + if (tx_pause)
> + m |= AX_MEDIUM_TFC;
> +
> + if (rx_pause)
> + m |= AX_MEDIUM_RFC;
> +
> + asix_write_medium_mode(dev, m, 0);
> + usbnet_link_change(dev, true, false);
> +}
> +
> +static const struct phylink_mac_ops ax88772_phylink_mac_ops = {
> + .validate = phylink_generic_validate,
> + .mac_config = ax88772_mac_config,
> + .mac_link_down = ax88772_mac_link_down,
> + .mac_link_up = ax88772_mac_link_up,
> +};
> +
> +static int ax88772_phylink_setup(struct usbnet *dev)
> +{
> + struct asix_common_private *priv = dev->driver_priv;
> + phy_interface_t phy_if_mode;
> + struct phylink *phylink;
> +
> + priv->phylink_config.dev = &dev->net->dev;
> + priv->phylink_config.type = PHYLINK_NETDEV;
> + priv->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
> + MAC_10 | MAC_100;
> +
> + __set_bit(PHY_INTERFACE_MODE_INTERNAL,
> + priv->phylink_config.supported_interfaces);
> + __set_bit(PHY_INTERFACE_MODE_RMII,
> + priv->phylink_config.supported_interfaces);
> +
> + if (priv->embd_phy)
> + phy_if_mode = PHY_INTERFACE_MODE_INTERNAL;
> + else
> + phy_if_mode = PHY_INTERFACE_MODE_RMII;
> +
> + phylink = phylink_create(&priv->phylink_config, dev->net->dev.fwnode,
> + phy_if_mode, &ax88772_phylink_mac_ops);
> + if (IS_ERR(phylink))
> + return PTR_ERR(phylink);
> +
> + priv->phylink = phylink;
Who will call phylink_destroy() on priv->phylink? It looks like you are
leaking it ?!?
Thanks!
Paolo
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