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

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Date: Mon, 3 Jul 2023 18:10:35 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: 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>, Yinjun Zhang
	<yinjun.zhang@...igine.com>, <netdev@...r.kernel.org>,
	<stable@...r.kernel.org>, <oss-drivers@...igine.com>
Subject: Re: [PATCH net v2] nfp: clean mc addresses in application firmware
 when closing port

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.

> +
>  /**
>   * 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