[PATCH v4 020/145] smb: smbdirect: introduce smbdirect_frwr_is_supported()

[Stefan Metzmacher]

This will replace frwr_is_supported() on the client and
rdma_frwr_is_supported() on the server.

Cc: Steve French <smfrench at gmail.com>
Cc: Tom Talpey <tom at talpey.com>
Cc: Long Li <longli at microsoft.com>
Cc: Namjae Jeon <linkinjeon at kernel.org>
Cc: linux-cifs at vger.kernel.org
Cc: samba-technical at lists.samba.org
Signed-off-by: Stefan Metzmacher <metze at samba.org>
Signed-off-by: Steve French <stfrench at microsoft.com>
---
 fs/smb/common/smbdirect/smbdirect_socket.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/fs/smb/common/smbdirect/smbdirect_socket.c b/fs/smb/common/smbdirect/smbdirect_socket.c
index cd7192584820..c064cbcb6b5c 100644
--- a/fs/smb/common/smbdirect/smbdirect_socket.c
+++ b/fs/smb/common/smbdirect/smbdirect_socket.c
@@ -6,6 +6,22 @@
 
 #include "smbdirect_internal.h"
 
+__maybe_unused /* this is temporary while this file is included in others */
+static bool smbdirect_frwr_is_supported(const struct ib_device_attr *attrs)
+{
+	/*
+	 * Test if FRWR (Fast Registration Work Requests) is supported on the
+	 * device This implementation requires FRWR on RDMA read/write return
+	 * value: true if it is supported
+	 */
+
+	if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
+		return false;
+	if (attrs->max_fast_reg_page_list_len == 0)
+		return false;
+	return true;
+}
+
 static void smbdirect_socket_cleanup_work(struct work_struct *work);
 
 __maybe_unused /* this is temporary while this file is included in others */
-- 
2.43.0