Commit fa8c08b8 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

mlxsw: spectrum_span: Add support for mirroring towards CPU port 



The Spectrum-2 and Spectrum-3 ASICs are able to mirror packets towards
the CPU. These packets are then trapped like any other packet, but with
a special packet trap and additional metadata such as why the packet was
mirrored.

The ability to mirror packets towards the CPU will be utilized by a
subsequent patch set that will mirror packets that were dropped by the
ASIC for various buffer-related reasons, such as tail-drop and
early-drop.

Add mirroring towards the CPU as a new SPAN agent type and re-use the
functions that mirror to a physical port where possible.

Reviewed-by: default avatarJiri Pirko <jiri@mellanox.com>
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 6edc8bea

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

+88 −0
Original line number Diff line number Diff line
@@ -128,6 +128,38 @@ void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp) 
	kfree(mlxsw_sp->span);

}



static bool mlxsw_sp1_span_cpu_can_handle(const struct net_device *dev)

{

	return !dev;

}



static int mlxsw_sp1_span_entry_cpu_parms(struct mlxsw_sp *mlxsw_sp,

					  const struct net_device *to_dev,

					  struct mlxsw_sp_span_parms *sparmsp)

{

	return -EOPNOTSUPP;

}



static int

mlxsw_sp1_span_entry_cpu_configure(struct mlxsw_sp_span_entry *span_entry,

				   struct mlxsw_sp_span_parms sparms)

{

	return -EOPNOTSUPP;

}



static void

mlxsw_sp1_span_entry_cpu_deconfigure(struct mlxsw_sp_span_entry *span_entry)

{

}



static const

struct mlxsw_sp_span_entry_ops mlxsw_sp1_span_entry_ops_cpu = {

	.can_handle = mlxsw_sp1_span_cpu_can_handle,

	.parms_set = mlxsw_sp1_span_entry_cpu_parms,

	.configure = mlxsw_sp1_span_entry_cpu_configure,

	.deconfigure = mlxsw_sp1_span_entry_cpu_deconfigure,

};



static int

mlxsw_sp_span_entry_phys_parms(struct mlxsw_sp *mlxsw_sp,

			       const struct net_device *to_dev,
@@ -633,6 +665,7 @@ struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_vlan = { 


static const

struct mlxsw_sp_span_entry_ops *mlxsw_sp1_span_entry_ops_arr[] = {

	&mlxsw_sp1_span_entry_ops_cpu,

	&mlxsw_sp_span_entry_ops_phys,

#if IS_ENABLED(CONFIG_NET_IPGRE)

	&mlxsw_sp_span_entry_ops_gretap4,
@@ -643,8 +676,49 @@ struct mlxsw_sp_span_entry_ops *mlxsw_sp1_span_entry_ops_arr[] = { 
	&mlxsw_sp_span_entry_ops_vlan,

};



static bool mlxsw_sp2_span_cpu_can_handle(const struct net_device *dev)

{

	return !dev;

}



static int mlxsw_sp2_span_entry_cpu_parms(struct mlxsw_sp *mlxsw_sp,

					  const struct net_device *to_dev,

					  struct mlxsw_sp_span_parms *sparmsp)

{

	sparmsp->dest_port = mlxsw_sp->ports[MLXSW_PORT_CPU_PORT];

	return 0;

}



static int

mlxsw_sp2_span_entry_cpu_configure(struct mlxsw_sp_span_entry *span_entry,

				   struct mlxsw_sp_span_parms sparms)

{

	/* Mirroring to the CPU port is like mirroring to any other physical

	 * port. Its local port is used instead of that of the physical port.

	 */

	return mlxsw_sp_span_entry_phys_configure(span_entry, sparms);

}



static void

mlxsw_sp2_span_entry_cpu_deconfigure(struct mlxsw_sp_span_entry *span_entry)

{

	enum mlxsw_reg_mpat_span_type span_type;



	span_type = MLXSW_REG_MPAT_SPAN_TYPE_LOCAL_ETH;

	mlxsw_sp_span_entry_deconfigure_common(span_entry, span_type);

}



static const

struct mlxsw_sp_span_entry_ops mlxsw_sp2_span_entry_ops_cpu = {

	.can_handle = mlxsw_sp2_span_cpu_can_handle,

	.parms_set = mlxsw_sp2_span_entry_cpu_parms,

	.configure = mlxsw_sp2_span_entry_cpu_configure,

	.deconfigure = mlxsw_sp2_span_entry_cpu_deconfigure,

};



static const

struct mlxsw_sp_span_entry_ops *mlxsw_sp2_span_entry_ops_arr[] = {

	&mlxsw_sp2_span_entry_ops_cpu,

	&mlxsw_sp_span_entry_ops_phys,

#if IS_ENABLED(CONFIG_NET_IPGRE)

	&mlxsw_sp_span_entry_ops_gretap4,
@@ -1540,6 +1614,13 @@ static int mlxsw_sp1_span_init(struct mlxsw_sp *mlxsw_sp) 
{

	size_t arr_size = ARRAY_SIZE(mlxsw_sp1_span_entry_ops_arr);



	/* Must be first to avoid NULL pointer dereference by subsequent

	 * can_handle() callbacks.

	 */

	if (WARN_ON(mlxsw_sp1_span_entry_ops_arr[0] !=

		    &mlxsw_sp1_span_entry_ops_cpu))

		return -EINVAL;



	mlxsw_sp->span->span_trigger_ops_arr = mlxsw_sp1_span_trigger_ops_arr;

	mlxsw_sp->span->span_entry_ops_arr = mlxsw_sp1_span_entry_ops_arr;

	mlxsw_sp->span->span_entry_ops_arr_size = arr_size;
@@ -1561,6 +1642,13 @@ static int mlxsw_sp2_span_init(struct mlxsw_sp *mlxsw_sp) 
{

	size_t arr_size = ARRAY_SIZE(mlxsw_sp2_span_entry_ops_arr);



	/* Must be first to avoid NULL pointer dereference by subsequent

	 * can_handle() callbacks.

	 */

	if (WARN_ON(mlxsw_sp2_span_entry_ops_arr[0] !=

		    &mlxsw_sp2_span_entry_ops_cpu))

		return -EINVAL;



	mlxsw_sp->span->span_trigger_ops_arr = mlxsw_sp2_span_trigger_ops_arr;

	mlxsw_sp->span->span_entry_ops_arr = mlxsw_sp2_span_entry_ops_arr;

	mlxsw_sp->span->span_entry_ops_arr_size = arr_size;

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