IB/core: Make testing MR flags for writability a static inline function
commit 08bb558ac11ab944e0539e78619d7b4c356278bd upstream.
Make the MR writability flags check, which is performed in umem.c,
a static inline function in file ib_verbs.h
This allows the function to be used by low-level infiniband drivers.
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 5ad43a4..a42535f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -3308,6 +3308,20 @@
return 0;
}
+static inline bool ib_access_writable(int access_flags)
+{
+ /*
+ * We have writable memory backing the MR if any of the following
+ * access flags are set. "Local write" and "remote write" obviously
+ * require write access. "Remote atomic" can do things like fetch and
+ * add, which will modify memory, and "MW bind" can change permissions
+ * by binding a window.
+ */
+ return access_flags &
+ (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND);
+}
+
/**
* ib_check_mr_status: lightweight check of MR status.
* This routine may provide status checks on a selected