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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: 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>
This commit is contained in:
Mark Bloch 2018-10-10 09:55:10 +03:00 committed by Jason Gunthorpe
parent 645ba5970c
commit ba4a411983
2 changed files with 15 additions and 1 deletions
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15
drivers/infiniband/hw/mlx5/flow.c
View File

@ -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,

1
include/uapi/rdma/mlx5_user_ioctl_cmds.h
View File

@ -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 {