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authorShamir Rabinovitch <shamir.rabinovitch@oracle.com>2019-02-07 19:44:48 +0300
committerJason Gunthorpe <jgg@mellanox.com>2019-02-15 21:17:25 +0300
commit730623f4a56fa42d4559715ff2f4a5c32b3ae8bf (patch)
treed5c452992681256bf84b2cb232f3614e376d3fd6 /include/rdma
parent3d9dfd060391928bd615db62ecddea5e1255edfd (diff)
downloadlinux-730623f4a56fa42d4559715ff2f4a5c32b3ae8bf.tar.xz
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')
-rw-r--r--include/rdma/uverbs_ioctl.h17
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,