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

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
View File

@ -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);

22
include/rdma/uverbs_ioctl.h
View File

@ -719,6 +719,28 @@ uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
return attr->ptr_attr.len;
}
/*
* uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
* attribute.
* @attrs: The attribute bundle
* @idx: The ID of the attribute
* @elem_size: The size of the element in the array
*/
static inline int
uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
size_t elem_size)
{
int size = uverbs_attr_get_len(attrs, idx);
if (size < 0)
return size;
if (size % elem_size)
return -EINVAL;
return size / elem_size;
}
/**
* uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
* UVERBS_ATTR_TYPE_IDRS_ARRAY.