netdev - Re: [PATCH v2 net-next 06/10] net: dsa: Pass VLAN MSTI migration notifications to driver

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Date:   Fri, 4 Mar 2022 00:29:42 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, kuba@...nel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Petr Machata <petrm@...dia.com>,
        Cooper Lees <me@...perlees.com>,
        Ido Schimmel <idosch@...dia.com>,
        Matt Johnston <matt@...econstruct.com.au>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next 06/10] net: dsa: Pass VLAN MSTI migration
 notifications to driver

On Tue, Mar 01, 2022 at 11:03:17AM +0100, Tobias Waldekranz wrote:
> Add the usual trampoline functionality from the generic DSA layer down
> to the drivers for VLAN MSTI migrations.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---
>  include/net/dsa.h  |  3 +++
>  net/dsa/dsa_priv.h |  1 +
>  net/dsa/port.c     | 10 ++++++++++
>  net/dsa/slave.c    |  6 ++++++
>  4 files changed, 20 insertions(+)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index cfedcfb86350..cc8acb01bd9b 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -962,6 +962,9 @@ struct dsa_switch_ops {
>  				 struct netlink_ext_ack *extack);
>  	int	(*port_vlan_del)(struct dsa_switch *ds, int port,
>  				 const struct switchdev_obj_port_vlan *vlan);
> +	int	(*vlan_msti_set)(struct dsa_switch *ds,
> +				 const struct switchdev_attr *attr);

I would rather pass the struct switchdev_vlan_attr and the orig_dev
(bridge) as separate arguments here. Or even the struct dsa_bridge, for
consistency to the API changes for database isolation.

> +
>  	/*
>  	 * Forwarding database
>  	 */
> diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
> index 07c0ad52395a..87ec0697e92e 100644
> --- a/net/dsa/dsa_priv.h
> +++ b/net/dsa/dsa_priv.h
> @@ -217,6 +217,7 @@ int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
>  			    struct netlink_ext_ack *extack);
>  bool dsa_port_skip_vlan_configuration(struct dsa_port *dp);
>  int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock);
> +int dsa_port_vlan_msti(struct dsa_port *dp, const struct switchdev_attr *attr);
>  int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
>  			bool targeted_match);
>  int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
> diff --git a/net/dsa/port.c b/net/dsa/port.c
> index d9da425a17fb..5f45cb7d70ba 100644
> --- a/net/dsa/port.c
> +++ b/net/dsa/port.c
> @@ -778,6 +778,16 @@ int dsa_port_bridge_flags(struct dsa_port *dp,
>  	return 0;
>  }
>  
> +int dsa_port_vlan_msti(struct dsa_port *dp, const struct switchdev_attr *attr)
> +{
> +	struct dsa_switch *ds = dp->ds;
> +
> +	if (!ds->ops->vlan_msti_set)
> +		return -EOPNOTSUPP;
> +
> +	return ds->ops->vlan_msti_set(ds, attr);

I guess this doesn't need to be a cross-chip notifier event for all
switches, because replication to all bridge ports is handled by
switchdev_handle_port_attr_set(). Ok. But isn't it called too many times
per switch?

> +}
> +
>  int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
>  			bool targeted_match)
>  {
> diff --git a/net/dsa/slave.c b/net/dsa/slave.c
> index 089616206b11..c6ffcd782b5a 100644
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -314,6 +314,12 @@ static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
>  
>  		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
>  		break;
> +	case SWITCHDEV_ATTR_ID_VLAN_MSTI:
> +		if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
> +			return -EOPNOTSUPP;
> +
> +		ret = dsa_port_vlan_msti(dp, attr);
> +		break;
>  	default:
>  		ret = -EOPNOTSUPP;
>  		break;
> -- 
> 2.25.1
>