Commit ba4a4119 authored by Mark Bloch's avatar Mark Bloch Committed by Jason Gunthorpe

RDMA/mlx5: Add support for flow tag to raw create flow

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: default avatarMark Bloch <markb@mellanox.com>
Reviewed-by: default avatarYishai Hadas <yishaih@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 645ba597
......@@ -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);
......@@ -513,6 +523,9 @@ DECLARE_UVERBS_NAMED_METHOD(
UVERBS_OBJECT_FLOW_ACTION,
UVERBS_ACCESS_READ, 1,
MLX5_IB_CREATE_FLOW_MAX_FLOW_ACTIONS,
UA_OPTIONAL),
UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_CREATE_FLOW_TAG,
UVERBS_ATTR_TYPE(u32),
UA_OPTIONAL));
DECLARE_UVERBS_NAMED_METHOD_DESTROY(
......
......@@ -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 {
......
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