linux-kernel - Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped frames

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Date:   Wed, 5 Aug 2020 06:44:09 -0400
From:   Neil Horman <nhorman@...alhost.localdomain>
To:     David Miller <davem@...emloft.net>
Cc:     izabela.bakollari@...il.com, nhorman@...driver.com,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped
 frames

On Tue, Aug 04, 2020 at 04:14:14PM -0700, David Miller wrote:
> From: izabela.bakollari@...il.com
> Date: Tue,  4 Aug 2020 18:09:08 +0200
> 
> > @@ -1315,6 +1334,53 @@ static int net_dm_cmd_trace(struct sk_buff *skb,
> >  	return -EOPNOTSUPP;
> >  }
> >  
> > +static int net_dm_interface_start(struct net *net, const char *ifname)
> > +{
> > +	struct net_device *nd = dev_get_by_name(net, ifname);
> > +
> > +	if (nd)
> > +		interface = nd;
> > +	else
> > +		return -ENODEV;
> > +
> > +	return 0;
> > +}
> > +
> > +static int net_dm_interface_stop(struct net *net, const char *ifname)
> > +{
> > +	dev_put(interface);
> > +	interface = NULL;
> > +
> > +	return 0;
> > +}
> 
> Where is the netdev notifier that will drop this reference if the network
> device is unregistered?
> 
See the changes to dropmon_net_event in the patch.  Its there under the case for
NETDEV_UNREGISTER

Neil