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

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Message-ID: <6e7b19fd-c8da-439d-9b9d-4dd3b6a5567d@openvpn.net>
Date: Wed, 8 May 2024 09:53:40 +0200
From: Antonio Quartulli <antonio@...nvpn.net>
To: Jakub Kicinski <kuba@...nel.org>
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 08/05/2024 02:18, Jakub Kicinski wrote:
> 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

ok

> 
>> +	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.

oh ok - this wasn't clear.
Will move the kdoc next to the implementation.

> 
>> +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

Thanks for pointing this out.
I see dev_get_stats() takes care of all this for us.

> 
>> +};
>> +
>>   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

ok, will move it up.


-- 
Antonio Quartulli
OpenVPN Inc.