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IB/uverbs: Add helper to get array size from ptr attribute

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When the parser of an ioctl command has the knowledge that a ptr attribute
in a bundle represents an array of structures, it is useful for it to know
the number of elements in the array. This is done by dividing the
attribute length with the element size.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Moni Shoua
2018-12-11 13:37:51 +02:00
committed by Jason Gunthorpe
parent bbc13cda37
commit cbfdd442c4
2 changed files with 27 additions and 7 deletions
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12
drivers/infiniband/hw/mlx5/flow.c
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@@ -331,7 +331,6 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_FLOW_ACTION_CREATE_MODIFY_HEADER)(
struct ib_flow_action *action;
size_t num_actions;
void *in;
int len;
int ret;
if (!mlx5_ib_modify_header_supported(mdev))
@@ -339,18 +338,17 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_FLOW_ACTION_CREATE_MODIFY_HEADER)(
in = uverbs_attr_get_alloced_ptr(attrs,
MLX5_IB_ATTR_CREATE_MODIFY_HEADER_ACTIONS_PRM);
len = uverbs_attr_get_len(attrs,
MLX5_IB_ATTR_CREATE_MODIFY_HEADER_ACTIONS_PRM);
if (len % MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto))
return -EINVAL;
num_actions = uverbs_attr_ptr_get_array_size(
attrs, MLX5_IB_ATTR_CREATE_MODIFY_HEADER_ACTIONS_PRM,
MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto));
if (num_actions < 0)
return num_actions;
ret = uverbs_get_const(&ft_type, attrs,
MLX5_IB_ATTR_CREATE_MODIFY_HEADER_FT_TYPE);
if (ret)
return ret;
num_actions = len / MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto),
action = mlx5_ib_create_modify_header(mdev, ft_type, num_actions, in);
if (IS_ERR(action))
return PTR_ERR(action);