[patch net-next 6/7] mlxsw: spectrum: mr_tcam: Add trap-and-forward multicast route

[Jiri Pirko]

From: Yotam Gigi <yot...@mellanox.com>

In addition to the current multicast route actions, which include trap
route action and a forward route action, add the trap-and-forward multicast
route action, and implement it in the multicast routing hardware logic.

To implement that, add a trap-and-forward ACL action as the last action in
the route flexible action set. The used trap is the ACL2 trap, which marks
the packets with offload_mr_forward_mark, to prevent the packet from being
forwarded again by the kernel.

Note: At that stage the offloading logic does not support trap-and-forward
multicast routes. This patch adds the support only in the hardware logic.

Signed-off-by: Yotam Gigi <yot...@mellanox.com>
Reviewed-by: Ido Schimmel <ido...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.h      | 1 +
 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.h 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.h
index c851b23..5d26a12 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.h
@@ -42,6 +42,7 @@
 enum mlxsw_sp_mr_route_action {
        MLXSW_SP_MR_ROUTE_ACTION_FORWARD,
        MLXSW_SP_MR_ROUTE_ACTION_TRAP,
+       MLXSW_SP_MR_ROUTE_ACTION_TRAP_AND_FORWARD,
 };
 
 enum mlxsw_sp_mr_route_prio {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
index cda9e9a..3ffb28d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
@@ -253,6 +253,7 @@ mlxsw_sp_mr_tcam_afa_block_create(struct mlxsw_sp *mlxsw_sp,
                if (err)
                        goto err;
                break;
+       case MLXSW_SP_MR_ROUTE_ACTION_TRAP_AND_FORWARD:
        case MLXSW_SP_MR_ROUTE_ACTION_FORWARD:
                /* If we are about to append a multicast router action, commit
                 * the erif_list.
@@ -266,6 +267,13 @@ mlxsw_sp_mr_tcam_afa_block_create(struct mlxsw_sp 
*mlxsw_sp,
                                                      erif_list->kvdl_index);
                if (err)
                        goto err;
+
+               if (route_action == MLXSW_SP_MR_ROUTE_ACTION_TRAP_AND_FORWARD) {
+                       err = mlxsw_afa_block_append_trap_and_forward(afa_block,
+                                                                     
MLXSW_TRAP_ID_ACL2);
+                       if (err)
+                               goto err;
+               }
                break;
        default:
                err = -EINVAL;
-- 
2.9.5