From: Stefan Metzmacher <metze@samba.org>
Date: Thu, 28 Aug 2025 14:45:23 +0000 (+0200)
Subject: smb: smbdirect: introduce smbdirect_frwr_is_supported()
X-Git-Tag: v7.1-rc1~128^2~129
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66a840b3ba538142fec5895cb197b1ec9f3a717c;p=thirdparty%2Fkernel%2Flinux.git

smb: smbdirect: introduce smbdirect_frwr_is_supported()

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

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/smb/common/smbdirect/smbdirect_socket.c b/fs/smb/common/smbdirect/smbdirect_socket.c
index b5ce5f6443f60..05a284526aa21 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 */