netdev - Re: [PATCH net-next v2 05/22] ovpn: implement interface creation/destruction via netlink

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Date: Tue, 02 Apr 2024 08:48:16 +0200
From: Esben Haabendal <esben@...nix.com>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org,  Jakub Kicinski <kuba@...nel.org>,  Sergey
 Ryazanov <ryazanov.s.a@...il.com>,  Paolo Abeni <pabeni@...hat.com>,  Eric
 Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v2 05/22] ovpn: implement interface
 creation/destruction via netlink

Antonio Quartulli <antonio@...nvpn.net> writes:

> On 25/03/2024 16:01, Esben Haabendal wrote:
>> Antonio Quartulli <antonio@...nvpn.net> writes:
>> 
>>> Allow userspace to create and destroy an interface using netlink
>>> commands.
>>>
>>> Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
>>> ---
>>>   drivers/net/ovpn/netlink.c | 50 ++++++++++++++++++++++++++++++++++++++
>>>   1 file changed, 50 insertions(+)
>>>
>>> diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
>>> index 2e855ce145e7..02b41034f615 100644
>>> --- a/drivers/net/ovpn/netlink.c
>>> +++ b/drivers/net/ovpn/netlink.c
>>> @@ -154,7 +154,57 @@ static void ovpn_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb
>>>   		dev_put(ovpn->dev);
>>>   }
>>>   +static int ovpn_nl_new_iface(struct sk_buff *skb, struct genl_info *info)
>>> +{
>>> +	enum ovpn_mode mode = OVPN_MODE_P2P;
>>> +	struct net_device *dev;
>>> +	char *ifname;
>>> +	int ret;
>>> +
>>> +	if (!info->attrs[OVPN_A_IFNAME])
>>> +		return -EINVAL;
>>> +
>>> +	ifname = nla_data(info->attrs[OVPN_A_IFNAME]);
>>> +
>>> +	if (info->attrs[OVPN_A_MODE]) {
>>> +		mode = nla_get_u8(info->attrs[OVPN_A_MODE]);
>>> +		netdev_dbg(dev, "%s: setting device (%s) mode: %u\n", __func__, ifname,
>>> +			   mode);
>> Maybe print out the message even if the default mode is used, as the
>> mode is applied in ovpn_iface_create anyways.
>
> Being this a debug message, my reasoning was "let's print what we got via
> netlink" (if nothing is printed, we know we are applying the default).
>
> Otherwise, when printing "P2P" we wouldn't be able to understand if it was set
> by default or received via netlink.
>
> Does it make sense?

Yes, reasoning is sane. And the prefixing with __func__ should help
making it clear.

/Esben