linux-kernel - Re: [PATCH 13/15] habanalabs/gaudi: Add ethtool support using coresight

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Message-ID: <CAFCwf10W_gzrZi4PtiQpjHCvi+ioS9xCS42q9sWSxOd0VOA4xg@mail.gmail.com>
Date:   Thu, 10 Sep 2020 23:22:25 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, SW_Drivers <SW_Drivers@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Omer Shpigelman <oshpigelman@...ana.ai>
Subject: Re: [PATCH 13/15] habanalabs/gaudi: Add ethtool support using coresight

On Thu, Sep 10, 2020 at 11:19 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > +static int gaudi_nic_get_link_ksettings(struct net_device *netdev,
> > +                                     struct ethtool_link_ksettings *cmd)
> > +{
> > +     struct gaudi_nic_device **ptr = netdev_priv(netdev);
> > +     struct gaudi_nic_device *gaudi_nic = *ptr;
> > +     struct hl_device *hdev = gaudi_nic->hdev;
> > +     u32 port = gaudi_nic->port, speed = gaudi_nic->speed;
>
> Please go through the code and fixup Reverse Christmas tree.
Of course, we will fix this.

>
> > +
> > +     cmd->base.speed = speed;
> > +     cmd->base.duplex = DUPLEX_FULL;
> > +
> > +     ethtool_link_ksettings_zero_link_mode(cmd, supported);
> > +     ethtool_link_ksettings_zero_link_mode(cmd, advertising);
> > +
> > +     ethtool_add_mode(cmd, supported, 100000baseCR4_Full);
> > +     ethtool_add_mode(cmd, supported, 100000baseSR4_Full);
> > +     ethtool_add_mode(cmd, supported, 100000baseKR4_Full);
> > +     ethtool_add_mode(cmd, supported, 100000baseLR4_ER4_Full);
> > +
> > +     ethtool_add_mode(cmd, supported, 50000baseSR2_Full);
> > +     ethtool_add_mode(cmd, supported, 50000baseCR2_Full);
> > +     ethtool_add_mode(cmd, supported, 50000baseKR2_Full);
> > +
> > +     if (speed == SPEED_100000) {
> > +             ethtool_add_mode(cmd, advertising, 100000baseCR4_Full);
> > +             ethtool_add_mode(cmd, advertising, 100000baseSR4_Full);
> > +             ethtool_add_mode(cmd, advertising, 100000baseKR4_Full);
> > +             ethtool_add_mode(cmd, advertising, 100000baseLR4_ER4_Full);
> > +
> > +             cmd->base.port = PORT_FIBRE;
> > +
> > +             ethtool_add_mode(cmd, supported, FIBRE);
> > +             ethtool_add_mode(cmd, advertising, FIBRE);
> > +
> > +             ethtool_add_mode(cmd, supported, Backplane);
> > +             ethtool_add_mode(cmd, advertising, Backplane);
> > +     } else if (speed == SPEED_50000) {
> > +             ethtool_add_mode(cmd, advertising, 50000baseSR2_Full);
> > +             ethtool_add_mode(cmd, advertising, 50000baseCR2_Full);
> > +             ethtool_add_mode(cmd, advertising, 50000baseKR2_Full);
> > +     } else {
> > +             dev_err(hdev->dev, "unknown speed %d, port %d\n", speed, port);
> > +             return -EFAULT;
> > +     }
> > +
> > +     ethtool_add_mode(cmd, supported, Autoneg);
> > +
> > +     if (gaudi_nic->auto_neg_enable) {
> > +             ethtool_add_mode(cmd, advertising, Autoneg);
> > +             cmd->base.autoneg = AUTONEG_ENABLE;
> > +             if (gaudi_nic->auto_neg_resolved)
> > +                     ethtool_add_mode(cmd, lp_advertising, Autoneg);
> > +     } else {
> > +             cmd->base.autoneg = AUTONEG_DISABLE;
> > +     }
> > +
> > +     ethtool_add_mode(cmd, supported, Pause);
> > +
> > +     if (gaudi_nic->pfc_enable)
> > +             ethtool_add_mode(cmd, advertising, Pause);
> > +
> > +     return 0;
> > +}
> > +
> > +static int gaudi_nic_set_link_ksettings(struct net_device *netdev,
> > +                             const struct ethtool_link_ksettings *cmd)
> > +{
> > +     struct gaudi_nic_device **ptr = netdev_priv(netdev);
> > +     struct gaudi_nic_device *gaudi_nic = *ptr;
> > +     struct hl_device *hdev = gaudi_nic->hdev;
> > +     u32 port = gaudi_nic->port;
> > +     int rc = 0, speed = cmd->base.speed;
> > +     bool auto_neg = cmd->base.autoneg == AUTONEG_ENABLE;
>
> It appears you only support speed and auto_neg. You should check that
> all other things which could be configured are empty, e.g. none of the
> bits are set in cmd->link_modes.advertising. If you are requested to
> configure something which is not supported, you need to return
> -EOPNOTSUPP.
>
>         Andrew

Thanks Andrew,
We will do that and send an updated version.
Oded