netdev - Re: [PATCH net-next v2 1/7] bnx2x: convert to use ndo

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Message-ID: <20251104173737.3f655692@kernel.org>
Date: Tue, 4 Nov 2025 17:37:37 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: Manish Chopra <manishc@...vell.com>, Marco Crivellari
 <marco.crivellari@...e.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Sunil Goutham <sgoutham@...vell.com>, Richard
 Cochran <richardcochran@...il.com>, Russell King <linux@...linux.org.uk>,
 Vladimir Oltean <vladimir.oltean@....com>, Simon Horman <horms@...nel.org>,
 Jacob Keller <jacob.e.keller@...el.com>, Kory Maincent
 <kory.maincent@...tlin.com>, linux-arm-kernel@...ts.infradead.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/7] bnx2x: convert to use ndo_hwtstamp
 callbacks

On Mon,  3 Nov 2025 15:09:46 +0000 Vadim Fedorenko wrote:
> -static int bnx2x_hwtstamp_ioctl(struct bnx2x *bp, struct ifreq *ifr)
> +static int bnx2x_hwtstamp_set(struct net_device *dev,
> +			      struct kernel_hwtstamp_config *config,
> +			      struct netlink_ext_ack *extack)
>  {
> -	struct hwtstamp_config config;
> +	struct bnx2x *bp = netdev_priv(dev);
>  	int rc;
>  
> -	DP(BNX2X_MSG_PTP, "HWTSTAMP IOCTL called\n");
> -
> -	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
> -		return -EFAULT;
> +	DP(BNX2X_MSG_PTP, "HWTSTAMP SET called\n");
>  
>  	DP(BNX2X_MSG_PTP, "Requested tx_type: %d, requested rx_filters = %d\n",
> -	   config.tx_type, config.rx_filter);
> +	   config->tx_type, config->rx_filter);
>  
>  	bp->hwtstamp_ioctl_called = true;
> -	bp->tx_type = config.tx_type;
> -	bp->rx_filter = config.rx_filter;
> +	bp->tx_type = config->tx_type;
> +	bp->rx_filter = config->rx_filter;
>  
>  	rc = bnx2x_configure_ptp_filters(bp);

bnx2x_configure_ptp_filters() may return -ERANGE if settings were not applied.
This may already be semi-broken but with the get in place we will make
it even worse. 

>  	if (rc)
>  		return rc;
>  
> -	config.rx_filter = bp->rx_filter;
> +	config->rx_filter = bp->rx_filter;
> +
> +	return 0;
> +}
>  
> -	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
> -		-EFAULT : 0;
> +static int bnx2x_hwtstamp_get(struct net_device *dev,
> +			      struct kernel_hwtstamp_config *config)
> +{
> +	struct bnx2x *bp = netdev_priv(dev);
> +
> +	config->rx_filter = bp->rx_filter;
> +	config->tx_type = bp->tx_type;
> +
> +	return 0;
>  }