Extending core and vendor verb commands require us to check that the
unknown part of the user's given command is all zeros.
Adding ib_is_udata_cleared in order to do so.

Signed-off-by: Matan Barak <mat...@mellanox.com>
---
 include/rdma/ib_verbs.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index e4cc389..43f3cf2 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1855,6 +1855,26 @@ static inline int ib_copy_to_udata(struct ib_udata 
*udata, void *src, size_t len
        return copy_to_user(udata->outbuf, src, len) ? -EFAULT : 0;
 }
 
+static inline bool ib_is_udata_cleared(struct ib_udata *udata,
+                                      char cleared_char,
+                                      size_t offset,
+                                      size_t len)
+{
+       short i;
+
+       for (i = 0; i < len; i++) {
+               char c;
+
+               if (copy_from_user(&c, udata->inbuf + offset + i, sizeof(c)))
+                       return false;
+
+               if (c != cleared_char)
+                       return false;
+       }
+
+       return true;
+}
+
 /**
  * ib_modify_qp_is_ok - Check that the supplied attribute mask
  * contains all required attributes and no attributes not allowed for
-- 
2.1.0

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