linux-kernel - Re: [PATCH 4/4] octeon_ep: add ethtool support for Octeon PCI Endpoint NIC.

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Date:   Fri, 11 Feb 2022 22:40:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Veerasenareddy Burru <vburru@...vell.com>
Cc:     davem@...emloft.net, kuba@...nel.org, corbet@....net,
        netdev@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        Satananda Burla <sburla@...vell.com>
Subject: Re: [PATCH 4/4] octeon_ep: add ethtool support for Octeon PCI
 Endpoint NIC.

> +static void octep_get_drvinfo(struct net_device *netdev,
> +			      struct ethtool_drvinfo *info)
> +{
> +	struct octep_device *oct = netdev_priv(netdev);
> +
> +	strscpy(info->driver, OCTEP_DRV_NAME, sizeof(info->driver));
> +	strscpy(info->version, OCTEP_DRV_VERSION_STR, sizeof(info->version));

A driver version string is meaningless. If you don't set it, the core
will fill in the kernel version, which is actually usable information.

> +static int octep_get_link_ksettings(struct net_device *netdev,
> +				    struct ethtool_link_ksettings *cmd)
> +{
> +	struct octep_device *oct = netdev_priv(netdev);
> +	struct octep_iface_link_info *link_info;
> +	u32 advertised, supported;
> +
> +	ethtool_link_ksettings_zero_link_mode(cmd, supported);
> +	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
> +
> +	octep_get_link_info(oct);
> +
> +	advertised = oct->link_info.advertised_modes;
> +	supported = oct->link_info.supported_modes;
> +	link_info = &oct->link_info;
> +
> +	if (supported & BIT(OCTEP_LINK_MODE_10GBASE_T))
> +		ethtool_link_ksettings_add_link_mode(cmd, supported, 10000baseT_Full);
> +	if (supported & BIT(OCTEP_LINK_MODE_10GBASE_R))
> +		ethtool_link_ksettings_add_link_mode(cmd, supported, 10000baseR_FEC);

....

> +
> +	if (advertised & BIT(OCTEP_LINK_MODE_10GBASE_T))
> +		ethtool_link_ksettings_add_link_mode(cmd, advertising, 10000baseT_Full);
> +	if (advertised & BIT(OCTEP_LINK_MODE_10GBASE_R))
> +		ethtool_link_ksettings_add_link_mode(cmd, advertising, 10000baseR_FEC);

It looks like you are doing the same thing twice, just different
variables. Pull this out into a helper.

Do you know what the link partner is advertising? It is useful debug
information if your firmware will tell you.

> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> index 700852fd4c3a..00c6ca047332 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> @@ -827,7 +827,7 @@ static int octep_set_mac(struct net_device *netdev, void *p)
>  		return err;
>  
>  	memcpy(oct->mac_addr, addr->sa_data, ETH_ALEN);
> -	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
> +	eth_hw_addr_set(netdev, addr->sa_data);
>  
>  	return 0;
>  }
> @@ -1067,7 +1068,7 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	netdev->mtu = OCTEP_DEFAULT_MTU;
>  
>  	octep_get_mac_addr(octep_dev, octep_dev->mac_addr);
> -	memcpy(netdev->dev_addr, octep_dev->mac_addr, netdev->addr_len);
> +	eth_hw_addr_set(netdev, octep_dev->mac_addr);

These two changes don't belong here.

      Andrew