netdev - RE: [PATCH net v2] nfp: clean mc addresses in application firmware when closing port

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Date: Tue, 4 Jul 2023 01:50:45 +0000
From: Yinjun Zhang <yinjun.zhang@...igine.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>, Louis Peens
	<louis.peens@...igine.com>
CC: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Jacob Keller <jacob.e.keller@...el.com>,
	Simon Horman <simon.horman@...igine.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org>,
	oss-drivers <oss-drivers@...igine.com>
Subject: RE: [PATCH net v2] nfp: clean mc addresses in application firmware
 when closing port

On Tuesday, July 4, 2023 12:11 AM, Alexander Lobakin wrote:
> From: Louis Peens <louis.peens@...igine.com>
> Date: Mon,  3 Jul 2023 14:01:16 +0200
> 
> > From: Yinjun Zhang <yinjun.zhang@...igine.com>
> >
> > When moving devices from one namespace to another, mc addresses are
> > cleaned in software while not removed from application firmware. Thus
> > the mc addresses are remained and will cause resource leak.
> >
> > Now use `__dev_mc_unsync` to clean mc addresses when closing port.
> >
> > Fixes: e20aa071cd95 ("nfp: fix schedule in atomic context when sync mc
> address")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Yinjun Zhang <yinjun.zhang@...igine.com>
> > Acked-by: Simon Horman <simon.horman@...igine.com>
> > Signed-off-by: Louis Peens <louis.peens@...igine.com>
> > ---
> > Changes since v1:
> >
> > * Use __dev_mc_unsyc to clean mc addresses instead of tracking mc
> addresses by
> >   driver itself.
> > * Clean mc addresses when closing port instead of driver exits,
> >   so that the issue of moving devices between namespaces can be fixed.
> > * Modify commit message accordingly.
> >
> >  .../ethernet/netronome/nfp/nfp_net_common.c   | 171 +++++++++---------
> >  1 file changed, 87 insertions(+), 84 deletions(-)
> 
> [...]
> 
> > +static int nfp_net_mc_sync(struct net_device *netdev, const unsigned char
> *addr)
> > +{
> > +	struct nfp_net *nn = netdev_priv(netdev);
> > +
> > +	if (netdev_mc_count(netdev) > NFP_NET_CFG_MAC_MC_MAX) {
> > +		nn_err(nn, "Requested number of MC addresses (%d)
> exceeds maximum (%d).\n",
> > +		       netdev_mc_count(netdev),
> NFP_NET_CFG_MAC_MC_MAX);
> > +		return -EINVAL;
> > +	}
> > +
> > +	return nfp_net_sched_mbox_amsg_work(nn,
> NFP_NET_CFG_MBOX_CMD_MULTICAST_ADD, addr,
> > +					    NFP_NET_CFG_MULTICAST_SZ,
> nfp_net_mc_cfg);
> > +}
> > +
> > +static int nfp_net_mc_unsync(struct net_device *netdev, const unsigned
> char *addr)
> > +{
> > +	struct nfp_net *nn = netdev_priv(netdev);
> > +
> > +	return nfp_net_sched_mbox_amsg_work(nn,
> NFP_NET_CFG_MBOX_CMD_MULTICAST_DEL, addr,
> > +					    NFP_NET_CFG_MULTICAST_SZ,
> nfp_net_mc_cfg);
> > +}
> 
> You can just declare nfp_net_mc_unsync()'s prototype here, so that it
> will be visible to nfp_net_netdev_close(), without moving the whole set
> of functions. Either way works, but that one would allow avoiding big
> diffs not really related to fixing things going through the net-fixes tree.

I didn't know which was preferred. Looks like minimum change is concerned
more. I'll change it.

> 
> > +
> >  /**
> >   * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
> >   * @nn:      NFP Net device to reconfigure
> > @@ -1084,6 +1168,9 @@ static int nfp_net_netdev_close(struct net_device
> *netdev)
> >
> >  	/* Step 2: Tell NFP
> >  	 */
> > +	if (nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER)
> > +		__dev_mc_unsync(netdev, nfp_net_mc_unsync);
> > +
> >  	nfp_net_clear_config_and_disable(nn);
> >  	nfp_port_configure(netdev, false);
> [...]
> 
> Thanks,
> Olek