xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

IB/core: Add legacy driver's user-data

Browse Source 
In this phase, we don't want to change all the drivers to use
flexible driver's specific attributes. Therefore, we add two default
attributes: UHW_IN and UHW_OUT. These attributes are optional in some
methods and they encode the driver specific command data. We add
a function that extract this data and creates the legacy udata over
it.

Driver's data should start from UVERBS_UDATA_DRIVER_DATA_FLAG. This
turns on the first bit of the namespace, indicating this attribute
belongs to the driver's namespace.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Matan Barak
2017-08-03 16:07:04 +03:00
committed by Doug Ledford
parent 64b19e1323
commit d70724f149
3 changed files with 96 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
include/rdma/uverbs_ioctl.h
View File

@@ -36,6 +36,7 @@
#include <rdma/uverbs_types.h>
#include <linux/uaccess.h>
#include <rdma/rdma_user_ioctl.h>
#include <rdma/ib_user_ioctl_verbs.h>
/*
* =======================================
@@ -338,6 +339,51 @@ static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_b
idx & ~UVERBS_ID_NS_MASK);
}
static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx)
{
u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
if (!uverbs_attr_is_valid(attrs_bundle, idx))
return ERR_PTR(-ENOENT);
return &attrs_bundle->hash[idx_bucket].attrs[idx & ~UVERBS_ID_NS_MASK];
}
static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
u16 flags;
if (IS_ERR(attr))
return PTR_ERR(attr);
flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
return (!copy_to_user(attr->ptr_attr.ptr, from, attr->ptr_attr.len) &&
!put_user(flags, &attr->uattr->flags)) ? 0 : -EFAULT;
}
static inline int _uverbs_copy_from(void *to, size_t to_size,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return PTR_ERR(attr);
if (to_size <= sizeof(((struct ib_uverbs_attr *)0)->data))
memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
else if (copy_from_user(to, attr->ptr_attr.ptr, attr->ptr_attr.len))
return -EFAULT;
return 0;
}
#define uverbs_copy_from(to, attrs_bundle, idx) \
_uverbs_copy_from(to, sizeof(*(to)), attrs_bundle, idx)
/* =================================================
* Definitions -> Specs infrastructure
* =================================================