netdev - Re: [PATCH v5 1/3] net: mhi : Add support to enable ethernet interface

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Message-ID: <aQ2uKPThPbTFhwKq@horms.kernel.org>
Date: Fri, 7 Nov 2025 08:30:32 +0000
From: Simon Horman <horms@...nel.org>
To: Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Manivannan Sadhasivam <mani@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 1/3] net: mhi : Add support to enable ethernet
 interface

On Thu, Nov 06, 2025 at 06:58:08PM +0530, Vivek Pernamitta wrote:
> From: Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>
> 
> Currently, we only have support for the NET driver. This update allows a
> new client to be configured as an Ethernet type over MHI by setting
> "mhi_device_info.ethernet_if = true". A new interface for Ethernet will
> be created with eth%d.
> 
> Signed-off-by: Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>

...

> @@ -119,11 +122,37 @@ static void mhi_ndo_get_stats64(struct net_device *ndev,
>  	} while (u64_stats_fetch_retry(&mhi_netdev->stats.tx_syncp, start));
>  }
>  
> +static int mhi_mac_address(struct net_device *dev, void *p)
> +{
> +	int ret;
> +
> +	if (dev->type == ARPHRD_ETHER) {
> +		ret = eth_mac_addr(dev, p);
> +	return ret;

nit: the indentation for the line above seems incorrect.

> +	}

But I wonder if we can simplify this slightly, like this:

	if (dev->type == ARPHRD_ETHER)
		return eth_mac_addr(dev, p);

Which would allow ret to be entirely removed from this function.

> +
> +	return 0;
> +}
> +
> +static int mhi_validate_address(struct net_device *dev)
> +{
> +	int ret;
> +
> +	if (dev->type == ARPHRD_ETHER) {
> +		ret = eth_validate_addr(dev);
> +		return ret;
> +	}

Likewise here.

> +
> +	return 0;
> +}

...

> @@ -140,6 +169,14 @@ static void mhi_net_setup(struct net_device *ndev)
>  	ndev->tx_queue_len = 1000;
>  }
>  
> +static void mhi_ethernet_setup(struct net_device *ndev)
> +{
> +	ndev->netdev_ops = &mhi_netdev_ops;
> +	ether_setup(ndev);
> +	ndev->min_mtu = ETH_MIN_MTU;

nit: The configuration on the line above is included in ether_setup.

> +	ndev->max_mtu = ETH_MAX_MTU;
> +}
> +
>  static struct sk_buff *mhi_net_skb_agg(struct mhi_net_dev *mhi_netdev,
>  				       struct sk_buff *skb)
>  {

...

> @@ -380,10 +431,17 @@ static void mhi_net_remove(struct mhi_device *mhi_dev)
>  
>  static const struct mhi_device_info mhi_hwip0 = {
>  	.netname = "mhi_hwip%d",
> +	.ethernet_if = false,
>  };
>  
>  static const struct mhi_device_info mhi_swip0 = {
>  	.netname = "mhi_swip%d",
> +	.ethernet_if = false,
> +};
> +
> +static const struct mhi_device_info mhi_eth0 = {
> +	.netname = "eth%d",
> +	.ethernet_if = true,
>  };

W=1 builds warn that mhi_eth0 is unused.
I think this can be addressed by squashing patches 1/2 and 2/2.

...

-- 
pw-bot: changes-requested