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mlxsw: spectrum_span: Add APIs to get / put a SPAN agent 

Given a netdev that packets should be mirrored to, create a SPAN agent
and return its identifier to the caller.

The SPAN agent is reference counted, as multiple tc-mirred actions can
point to the same destination netdev.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-04-30 20:01:08 +03:00 committed by David S. Miller
parent 07f81727c1
commit 466010342e
2 changed files with 47 additions and 0 deletions
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43
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
View File

@ -1039,3 +1039,46 @@ void mlxsw_sp_span_respin(struct mlxsw_sp *mlxsw_sp)
return;
mlxsw_core_schedule_work(&mlxsw_sp->span->work);
}
int mlxsw_sp_span_agent_get(struct mlxsw_sp *mlxsw_sp,
const struct net_device *to_dev, int *p_span_id)
{
const struct mlxsw_sp_span_entry_ops *ops;
struct mlxsw_sp_span_entry *span_entry;
struct mlxsw_sp_span_parms sparms;
int err;
ASSERT_RTNL();
ops = mlxsw_sp_span_entry_ops(mlxsw_sp, to_dev);
if (!ops) {
dev_err(mlxsw_sp->bus_info->dev, "Cannot mirror to requested destination\n");
return -EOPNOTSUPP;
}
memset(&sparms, 0, sizeof(sparms));
err = ops->parms_set(to_dev, &sparms);
if (err)
return err;
span_entry = mlxsw_sp_span_entry_get(mlxsw_sp, to_dev, ops, sparms);
if (!span_entry)
return -ENOBUFS;
*p_span_id = span_entry->id;
return 0;
}
void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id)
{
struct mlxsw_sp_span_entry *span_entry;
ASSERT_RTNL();
span_entry = mlxsw_sp_span_entry_find_by_id(mlxsw_sp, span_id);
if (WARN_ON_ONCE(!span_entry))
return;
mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
}

4
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
View File

@ -77,4 +77,8 @@ void mlxsw_sp_span_entry_invalidate(struct mlxsw_sp *mlxsw_sp,
int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu);
void mlxsw_sp_span_speed_update_work(struct work_struct *work);
int mlxsw_sp_span_agent_get(struct mlxsw_sp *mlxsw_sp,
const struct net_device *to_dev, int *p_span_id);
void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id);
#endif