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IB/verbs: Add helper function rdma_udata_to_drv_context 

Helper function to get driver's context out of ib_udata wrapped in
uverbs_attr_bundle for user objects or NULL for kernel objects.

Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Shamir Rabinovitch 2019-02-07 18:44:48 +02:00 committed by Jason Gunthorpe
parent 3d9dfd0603
commit 730623f4a5
1 changed files with 17 additions and 0 deletions
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17
include/rdma/uverbs_ioctl.h
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@ -664,6 +664,23 @@ static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_b
attrs_bundle->attr_present);
}
/**
* rdma_udata_to_drv_context - Helper macro to get the driver's context out of
* ib_udata which is embedded in uverbs_attr_bundle.
*
* If udata is not NULL this cannot fail. Otherwise a NULL udata will result
* in a NULL ucontext pointer, as a safety precaution. Callers should be using
* 'udata' to determine if the driver call is in user or kernel mode, not
* 'ucontext'.
*
*/
#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
(udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \
driver_udata) \
->context, \
drv_dev_struct, member) : \
(drv_dev_struct *)NULL)
#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,