From: Mark Bloch <markb@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Reviewed-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/flow.c | 15 ++++++++++++++-
include/uapi/rdma/mlx5_user_ioctl_cmds.h | 1 +
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/mlx5/flow.c b/drivers/infiniband/hw/mlx5/flow.c
index 4ee4af450720..e57435cb6d96 100644
--- 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_CREATE_FLOW)(
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.has_flow_tag = true;
+ }
+
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,
diff --git a/include/uapi/rdma/mlx5_user_ioctl_cmds.h b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
index fb4a8b17cca8..408e220034de 100644
--- 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 {
--
2.14.4
