From: Long Li <longli@microsoft.com>
Date: Fri, 17 Nov 2017 17:26:52 -0800
Subject: [PATCH] CIFS: SMBD: Implement function to create a SMB Direct
 connection
Git-commit: 399f9539d951adf26a1078e38c1b0f10cf6c3e71
Patch-mainline: v4.15
References: bsc#1144333

The upper layer calls this function to connect to peer through SMB Direct.
Each SMB Direct connection is based on a RDMA RC Queue Pair.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
 fs/cifs/smbdirect.c | 17 +++++++++++++++++
 fs/cifs/smbdirect.h |  6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 2ecd5c19d313..862cdf9424cb 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -1646,3 +1646,20 @@ struct smbd_connection *_smbd_get_connection(
 	kfree(info);
 	return NULL;
 }
+
+struct smbd_connection *smbd_get_connection(
+	struct TCP_Server_Info *server, struct sockaddr *dstaddr)
+{
+	struct smbd_connection *ret;
+	int port = SMBD_PORT;
+
+try_again:
+	ret = _smbd_get_connection(server, dstaddr, port);
+
+	/* Try SMB_PORT if SMBD_PORT doesn't work */
+	if (!ret && port == SMBD_PORT) {
+		port = SMB_PORT;
+		goto try_again;
+	}
+	return ret;
+}
diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h
index e4e65d3c6de8..25b3782cc692 100644
--- a/fs/cifs/smbdirect.h
+++ b/fs/cifs/smbdirect.h
@@ -243,9 +243,15 @@ struct smbd_response {
 	u8 packet[];
 };
 
+/* Create a SMBDirect session */
+struct smbd_connection *smbd_get_connection(
+	struct TCP_Server_Info *server, struct sockaddr *dstaddr);
+
 #else
 #define cifs_rdma_enabled(server)	0
 struct smbd_connection {};
+static inline void *smbd_get_connection(
+	struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
 #endif
 
 #endif
-- 
2.16.4