netdev - RE: [EXTERNAL] Re: [patch rdma-next v5 2/2] RDMA/mana_ib: Handle net event for pointing to the current netdev

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Message-ID:
 <SA6PR21MB42316CA1E7C6CF083A89ECE4CED62@SA6PR21MB4231.namprd21.prod.outlook.com>
Date: Mon, 10 Mar 2025 21:46:08 +0000
From: Long Li <longli@...rosoft.com>
To: Jason Gunthorpe <jgg@...pe.ca>, "longli@...uxonhyperv.com"
	<longli@...uxonhyperv.com>
CC: Leon Romanovsky <leon@...nel.org>, Konstantin Taranov
	<kotaranov@...rosoft.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>
Subject: RE: [EXTERNAL] Re: [patch rdma-next v5 2/2] RDMA/mana_ib: Handle net
 event for pointing to the current netdev

> Subject: RE: [EXTERNAL] Re: [patch rdma-next v5 2/2] RDMA/mana_ib:
> Handle net event for pointing to the current netdev
> 
> > Subject: [EXTERNAL] Re: [patch rdma-next v5 2/2] RDMA/mana_ib: Handle
> > net event for pointing to the current netdev
> >
> > On Thu, Mar 06, 2025 at 11:24:39AM -0800, longli@...uxonhyperv.com
> wrote:
> > > +	switch (event) {
> > > +	case NETDEV_CHANGEUPPER:
> > > +		ndev = mana_get_primary_netdev(mc, 0, &dev->dev_tracker);
> > > +		/*
> > > +		 * RDMA core will setup GID based on updated netdev.
> > > +		 * It's not possible to race with the core as rtnl lock is being
> > > +		 * held.
> > > +		 */
> > > +		ib_device_set_netdev(&dev->ib_dev, ndev, 1);
> > > +
> > > +		/* mana_get_primary_netdev() returns ndev with refcount
> held
> > */
> > > +		netdev_put(ndev, &dev->dev_tracker);
> >
> > ? What is the point of a tracker in dev if it never lasts outside this scope?
> >
> > ib_device_set_netdev() already has a tracker built into it.
> >
> > Jason
> 
> I was asked to use a tracker for netdev_hold()/netdev_put(). But this code
> (and the code in mana_ib_probe() of the 1st patch) is simple enough that
> everything is done in one scope.
> 
> Jakub, do you think it's okay to use NULL as the tracker in both patches?
> 
> Long

Hi, 

If we don't want to use a tracker, can we take the v4 version of the patch set?

Otherwise, please take v5 (this patch) if a tracker is required.

Thanks,
Long