From: Mark Bloch <markb@mellanox.com>
Date: Wed, 10 Oct 2018 09:55:10 +0300
Subject: RDMA/mlx5: Add support for flow tag to raw create flow
Patch-mainline: v4.20-rc1
Git-commit: ba4a41198324be2e6fbb06c270fdc8500c0e38de
References: bsc#1103991 FATE#326007

A user can provide a hint which will be attached to the packet and written
to the CQE on receive. This can be used as a way to offload operations
into the HW, for example parsing a packet which is a tunneled packet, and
if so, pass 0x1 as the hint. The software can use that hint to decapsulate
the packet and parse only the inner headers thus saving CPU cycles.

Signed-off-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/mlx5/flow.c        |   15 ++++++++++++++-
 include/uapi/rdma/mlx5_user_ioctl_cmds.h |    1 +
 2 files changed, 15 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx5/flow.c
+++ b/drivers/infiniband/hw/mlx5/flow.c
@@ -153,6 +153,16 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD
 				   arr_flow_actions[i]->object);
 	}
 
+	ret = uverbs_copy_from(&flow_act.flow_tag, attrs,
+			       MLX5_IB_ATTR_CREATE_FLOW_TAG);
+	if (!ret) {
+		if (flow_act.flow_tag >= BIT(24)) {
+			ret = -EINVAL;
+			goto err_out;
+		}
+		flow_act.flags |= FLOW_ACT_HAS_TAG;
+	}
+
 	flow_handler = mlx5_ib_raw_fs_rule_add(dev, fs_matcher, &flow_act,
 					       cmd_in, inlen,
 					       dest_id, dest_type);
@@ -513,7 +523,10 @@ DECLARE_UVERBS_NAMED_METHOD(
 			     UVERBS_OBJECT_FLOW_ACTION,
 			     UVERBS_ACCESS_READ, 1,
 			     MLX5_IB_CREATE_FLOW_MAX_FLOW_ACTIONS,
-			     UA_OPTIONAL));
+			     UA_OPTIONAL),
+	UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_CREATE_FLOW_TAG,
+			   UVERBS_ATTR_TYPE(u32),
+			   UA_OPTIONAL));
 
 DECLARE_UVERBS_NAMED_METHOD_DESTROY(
 	MLX5_IB_METHOD_DESTROY_FLOW,
--- a/include/uapi/rdma/mlx5_user_ioctl_cmds.h
+++ b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
@@ -157,6 +157,7 @@ enum mlx5_ib_create_flow_attrs {
 	MLX5_IB_ATTR_CREATE_FLOW_DEST_DEVX,
 	MLX5_IB_ATTR_CREATE_FLOW_MATCHER,
 	MLX5_IB_ATTR_CREATE_FLOW_ARR_FLOW_ACTIONS,
+	MLX5_IB_ATTR_CREATE_FLOW_TAG,
 };
 
 enum mlx5_ib_destoy_flow_attrs {