Commit e00698d1 authored by Petr Machata's avatar Petr Machata Committed by David S. Miller
Browse files

mlxsw: spectrum_span: Support mirror-to-VLAN 



Offload "tc action mirred mirror" to a device that is a vlan device on
top of a front-panel port device. The hardware encapsulates the mirrored
packets in a VLAN tag. That includes the case that the mirrored traffic
is already VLAN-tagged--in that case the monitor traffic will be
double-tagged, just like in the software path.

Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41947662

drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c

+64 −0
Original line number Diff line number Diff line
@@ -235,6 +235,14 @@ mlxsw_sp_span_entry_bridge(const struct net_device *br_dev, 
	return dev;

}



static struct net_device *

mlxsw_sp_span_entry_vlan(const struct net_device *vlan_dev,

			 u16 *p_vid)

{

	*p_vid = vlan_dev_vlan_id(vlan_dev);

	return vlan_dev_real_dev(vlan_dev);

}



static __maybe_unused int

mlxsw_sp_span_entry_tunnel_parms_common(struct net_device *l3edev,

					union mlxsw_sp_l3addr saddr,
@@ -477,6 +485,61 @@ struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_gretap6 = { 
};

#endif



static bool

mlxsw_sp_span_vlan_can_handle(const struct net_device *dev)

{

	return is_vlan_dev(dev) &&

	       mlxsw_sp_port_dev_check(vlan_dev_real_dev(dev));

}



static int

mlxsw_sp_span_entry_vlan_parms(const struct net_device *to_dev,

			       struct mlxsw_sp_span_parms *sparmsp)

{

	struct net_device *real_dev;

	u16 vid;



	if (!(to_dev->flags & IFF_UP))

		return mlxsw_sp_span_entry_unoffloadable(sparmsp);



	real_dev = mlxsw_sp_span_entry_vlan(to_dev, &vid);

	sparmsp->dest_port = netdev_priv(real_dev);

	sparmsp->vid = vid;

	return 0;

}



static int

mlxsw_sp_span_entry_vlan_configure(struct mlxsw_sp_span_entry *span_entry,

				   struct mlxsw_sp_span_parms sparms)

{

	struct mlxsw_sp_port *dest_port = sparms.dest_port;

	struct mlxsw_sp *mlxsw_sp = dest_port->mlxsw_sp;

	u8 local_port = dest_port->local_port;

	char mpat_pl[MLXSW_REG_MPAT_LEN];

	int pa_id = span_entry->id;



	mlxsw_reg_mpat_pack(mpat_pl, pa_id, local_port, true,

			    MLXSW_REG_MPAT_SPAN_TYPE_REMOTE_ETH);

	mlxsw_reg_mpat_eth_rspan_pack(mpat_pl, sparms.vid);



	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mpat), mpat_pl);

}



static void

mlxsw_sp_span_entry_vlan_deconfigure(struct mlxsw_sp_span_entry *span_entry)

{

	mlxsw_sp_span_entry_deconfigure_common(span_entry,

					MLXSW_REG_MPAT_SPAN_TYPE_REMOTE_ETH);

}



static const

struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_vlan = {

	.can_handle = mlxsw_sp_span_vlan_can_handle,

	.parms = mlxsw_sp_span_entry_vlan_parms,

	.configure = mlxsw_sp_span_entry_vlan_configure,

	.deconfigure = mlxsw_sp_span_entry_vlan_deconfigure,

};



static const

struct mlxsw_sp_span_entry_ops *const mlxsw_sp_span_entry_types[] = {

	&mlxsw_sp_span_entry_ops_phys,
@@ -486,6 +549,7 @@ struct mlxsw_sp_span_entry_ops *const mlxsw_sp_span_entry_types[] = { 
#if IS_ENABLED(CONFIG_IPV6_GRE)

	&mlxsw_sp_span_entry_ops_gretap6,

#endif

	&mlxsw_sp_span_entry_ops_vlan,

};



static int

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