[PATCH net-next 13/13] mlxsw: core: Use mirror reason during Rx listener lookup

[Ido Schimmel <idosch@idosch.org>]

From: Ido Schimmel <idosch@mellanox.com>

The Rx listener abstraction allows the switch driver (e.g.,
mlxsw_spectrum) to register a function that is called when a packet is
received (trapped) for a specific reason.

Up until now, the Rx listener lookup was solely based on the trap
identifier. However, when a packet is mirrored to the CPU the trap
identifier merely indicates that the packet was mirrored, but not why it
was mirrored. This makes it impossible for the switch driver to register
different Rx listeners for different mirror reasons.

Solve this by allowing the switch driver to register a Rx listener with
a mirror reason and by extending the Rx listener lookup to take the
mirror reason into account.

Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 6 ++++--
 drivers/net/ethernet/mellanox/mlxsw/core.h | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 8b3791d73c99..1363168b3c82 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1524,7 +1524,8 @@ static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
 {
 	return (rxl_a->func == rxl_b->func &&
 		rxl_a->local_port == rxl_b->local_port &&
-		rxl_a->trap_id == rxl_b->trap_id);
+		rxl_a->trap_id == rxl_b->trap_id &&
+		rxl_a->mirror_reason == rxl_b->mirror_reason);
 }
 
 static struct mlxsw_rx_listener_item *
@@ -2044,7 +2045,8 @@ void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
 		rxl = &rxl_item->rxl;
 		if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
 		     rxl->local_port == local_port) &&
-		    rxl->trap_id == rx_info->trap_id) {
+		    rxl->trap_id == rx_info->trap_id &&
+		    rxl->mirror_reason == rx_info->mirror_reason) {
 			if (rxl_item->enabled)
 				found = true;
 			break;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.h b/drivers/net/ethernet/mellanox/mlxsw/core.h
index c736b8673791..c1c1e039323a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.h
@@ -61,6 +61,7 @@ void mlxsw_core_ptp_transmitted(struct mlxsw_core *mlxsw_core,
 struct mlxsw_rx_listener {
 	void (*func)(struct sk_buff *skb, u8 local_port, void *priv);
 	u8 local_port;
+	u8 mirror_reason;
 	u16 trap_id;
 };
 
-- 
2.26.2