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| author | Shamir Rabinovitch <shamir.rabinovitch@oracle.com> | 2019-02-07 18:44:48 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-02-15 11:17:25 -0700 |
| commit | 730623f4a56fa42d4559715ff2f4a5c32b3ae8bf (patch) | |
| tree | d5c452992681256bf84b2cb232f3614e376d3fd6 /include/rdma/uverbs_ioctl.h | |
| parent | 3d9dfd060391928bd615db62ecddea5e1255edfd (diff) | |
| download | linux-730623f4a56fa42d4559715ff2f4a5c32b3ae8bf.tar.gz | |
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>
Diffstat (limited to 'include/rdma/uverbs_ioctl.h')
| -rw-r--r-- | include/rdma/uverbs_ioctl.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h index b14a9ee786e9..28570ac2b6a0 100644 --- a/include/rdma/uverbs_ioctl.h +++ b/include/rdma/uverbs_ioctl.h @@ -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, |