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authorJason Gunthorpe <jgg@mellanox.com>2018-08-10 05:14:39 +0300
committerJason Gunthorpe <jgg@mellanox.com>2018-08-11 01:06:24 +0300
commit6a1f444fefeba392d1232b408aaf5902e33e0982 (patch)
tree7e1e771666a574797c890a2a9d2a29fa22c9c2ab /include/rdma
parent4b3dd2bbf0818ccb23e7f2831f2ca4a86789cd1f (diff)
downloadlinux-6a1f444fefeba392d1232b408aaf5902e33e0982.tar.xz
IB/uverbs: Remove the ib_uverbs_attr pointer from each attr
Memory in the bundle is valuable, do not waste it holding an 8 byte pointer for the rare case of writing to a PTR_OUT. We can compute the pointer by storing a small 1 byte array offset and the base address of the uattr memory in the bundle private memory. This also means we can access the kernel's copy of the ib_uverbs_attr, so drop the copy of flags as well. Since the uattr base should be private bundle information this also de-inlines the already too big uverbs_copy_to inline and moves create_udata into uverbs_ioctl.c so they can see the private struct definition. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/uverbs_ioctl.h36
1 files changed, 8 insertions, 28 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h
index 3b497d9ed395..ecf028446cdf 100644
--- a/include/rdma/uverbs_ioctl.h
+++ b/include/rdma/uverbs_ioctl.h
@@ -461,8 +461,7 @@ struct uverbs_ptr_attr {
u64 data;
};
u16 len;
- /* Combination of bits from enum UVERBS_ATTR_F_XXXX */
- u16 flags;
+ u16 uattr_idx;
u8 enum_id;
};
@@ -471,11 +470,6 @@ struct uverbs_obj_attr {
};
struct uverbs_attr {
- /*
- * pointer to the user-space given attribute, in order to write the
- * new uobject's id or update flags.
- */
- struct ib_uverbs_attr __user *uattr;
union {
struct uverbs_ptr_attr ptr_attr;
struct uverbs_obj_attr obj_attr;
@@ -575,27 +569,6 @@ uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
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)
-{
- const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
- u16 flags;
- size_t min_size;
-
- if (IS_ERR(attr))
- return PTR_ERR(attr);
-
- min_size = min_t(size_t, attr->ptr_attr.len, size);
- if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
- return -EFAULT;
-
- flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
- if (put_user(flags, &attr->uattr->flags))
- return -EFAULT;
-
- return 0;
-}
-
static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
{
return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
@@ -676,6 +649,8 @@ int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
+int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx,
+ const void *from, size_t size);
#else
static inline int
uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
@@ -689,6 +664,11 @@ uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
{
return -EINVAL;
}
+static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
+ size_t idx, const void *from, size_t size)
+{
+ return -EINVAL;
+}
#endif
/* =================================================