From 8762d149e88dea5bc09e0d7faa84b635807167ab Mon Sep 17 00:00:00 2001 From: Matan Barak Date: Sun, 17 Jun 2018 12:59:52 +0300 Subject: IB/uverbs: Add PTR_IN attributes that are allocated/copied automatically Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak Signed-off-by: Yishai Hadas Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- include/rdma/uverbs_ioctl.h | 36 +++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) (limited to 'include/rdma') diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h index bd6bba3a6e04..11cc40ef1cb6 100644 --- a/include/rdma/uverbs_ioctl.h +++ b/include/rdma/uverbs_ioctl.h @@ -65,6 +65,10 @@ enum { UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0, /* Support extending attributes by length, validate all unknown size == zero */ UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO = 1U << 1, + /* + * Valid only for PTR_IN. Allocate and copy the data inside the parser + */ + UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY = 1U << 2, }; /* Specification of a single attribute inside the ioctl message */ @@ -323,7 +327,14 @@ struct uverbs_object_tree_def { */ struct uverbs_ptr_attr { - u64 data; + /* + * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is + * used. + */ + union { + void *ptr; + u64 data; + }; u16 len; /* Combination of bits from enum UVERBS_ATTR_F_XXXX */ u16 flags; @@ -431,6 +442,17 @@ static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_att return attr->obj_attr.uobject; } +static inline int +uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return PTR_ERR(attr); + + return attr->ptr_attr.len; +} + static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx, const void *from, size_t size) { @@ -457,6 +479,18 @@ static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr) return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data); } +static inline void *uverbs_attr_get_alloced_ptr( + const struct uverbs_attr_bundle *attrs_bundle, u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return (void *)attr; + + return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data : + attr->ptr_attr.ptr; +} + static inline int _uverbs_copy_from(void *to, const struct uverbs_attr_bundle *attrs_bundle, size_t idx, -- cgit v1.2.3