netdev - Re: [PATCH net-next v3] net/tun: Call netdev notifiers

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Date:   Wed, 18 Nov 2020 06:22:31 +0100
From:   Martin Schiller <ms@....tdt.de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3] net/tun: Call netdev notifiers

On 2020-11-18 01:32, Jakub Kicinski wrote:
> On Mon, 16 Nov 2020 11:41:21 +0100 Martin Schiller wrote:
>> Call netdev notifiers before and after changing the device type.
>> 
>> Signed-off-by: Martin Schiller <ms@....tdt.de>
>> ---
>> 
>> Change from v2:
>> use subject_prefix 'net-next' to fix 'fixes_present' issue
>> 
>> Change from v1:
>> fix 'subject_prefix' and 'checkpatch' warnings
>> 
>> ---
>>  drivers/net/tun.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
>> index 3d45d56172cb..2d9a00f41023 100644
>> --- a/drivers/net/tun.c
>> +++ b/drivers/net/tun.c
>> @@ -3071,9 +3071,13 @@ static long __tun_chr_ioctl(struct file *file, 
>> unsigned int cmd,
>>  				   "Linktype set failed because interface is up\n");
>>  			ret = -EBUSY;
>>  		} else {
>> +			call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
>> +						 tun->dev);
> 
> This call may return an error (which has to be unpacked with
> notifier_to_errno()).

OK, I'll fix that and send a v3 patch.

> 
>>  			tun->dev->type = (int) arg;
>>  			netif_info(tun, drv, tun->dev, "linktype set to %d\n",
>>  				   tun->dev->type);
>> +			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
>> +						 tun->dev);
>>  			ret = 0;
>>  		}
>>  		break;