netdev - Re: [PATCH net-next v3 04/24] ovpn: add basic interface creation/destruction/management routines

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Message-ID: <20240507171835.1e92cffa@kernel.org>
Date: Tue, 7 May 2024 17:18:35 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Sergey Ryazanov <ryazanov.s.a@...il.com>, Paolo
 Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Andrew Lunn
 <andrew@...n.ch>, Esben Haabendal <esben@...nix.com>
Subject: Re: [PATCH net-next v3 04/24] ovpn: add basic interface
 creation/destruction/management routines

On Mon,  6 May 2024 03:16:17 +0200 Antonio Quartulli wrote:

> diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c
> index ad3813419c33..338e99dfe886 100644
> --- a/drivers/net/ovpn/io.c
> +++ b/drivers/net/ovpn/io.c
> @@ -11,6 +11,26 @@
>  #include <linux/skbuff.h>
>  
>  #include "io.h"
> +#include "ovpnstruct.h"
> +#include "netlink.h"
> +
> +int ovpn_struct_init(struct net_device *dev)
> +{
> +	struct ovpn_struct *ovpn = netdev_priv(dev);
> +	int err;
> +
> +	ovpn->dev = dev;
> +
> +	err = ovpn_nl_init(ovpn);
> +	if (err < 0)
> +		return err;
> +
> +	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);

Set pcpu_stat_type, core will allocate for you

> +	if (!dev->tstats)
> +		return -ENOMEM;
> +
> +	return 0;
> +}

> +/**
> + * ovpn_struct_init - Initialize the netdevice private area
> + * @dev: the device to initialize
> + *
> + * Return: 0 on success or a negative error code otherwise
> + */
> +int ovpn_struct_init(struct net_device *dev);

Weak preference for kdoc to go with the implementation, not declaration.

> +static const struct net_device_ops ovpn_netdev_ops = {
> +	.ndo_open		= ovpn_net_open,
> +	.ndo_stop		= ovpn_net_stop,
> +	.ndo_start_xmit		= ovpn_net_xmit,
> +	.ndo_get_stats64        = dev_get_tstats64,

Core should count pcpu stats automatically

> +};
> +
>  bool ovpn_dev_is_valid(const struct net_device *dev)
>  {
>  	return dev->netdev_ops->ndo_start_xmit == ovpn_net_xmit;
>  }

> +	list_add(&ovpn->dev_list, &dev_list);
> +	rtnl_unlock();
> +
> +	/* turn carrier explicitly off after registration, this way state is
> +	 * clearly defined
> +	 */
> +	netif_carrier_off(dev);

carrier off inside the locked section, user can call open
immediately after unlock