linux-kernel - 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: <20250312133804.GC1322339@unreal>
Date: Wed, 12 Mar 2025 15:38:04 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Long Li <longli@...rosoft.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>,
	"longli@...uxonhyperv.com" <longli@...uxonhyperv.com>,
	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

On Mon, Mar 10, 2025 at 09:46:08PM +0000, Long Li wrote:
> > 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.

Let's use v5 version as it is more complete variant, however the series
needs to be rebased as it doesn't apply after Konstantin's changes.

Thanks

> 
> Thanks,
> Long