CIFS: add iface info to struct cifs_ses

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifsglob.h

@@ -841,6 +841,13 @@ static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 
 #endif
 
+struct cifs_server_iface {
+	size_t speed;
+	unsigned int rdma_capable : 1;
+	unsigned int rss_capable : 1;
+	struct sockaddr_storage sockaddr;
+};
+
 /*
  * Session structure.  One of these for each uid session with a particular host
  */
@@ -878,6 +885,20 @@ struct cifs_ses {
 #ifdef CONFIG_CIFS_SMB311
 	__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
 #endif /* 3.1.1 */
+
+	/*
+	 * Network interfaces available on the server this session is
+	 * connected to.
+	 *
+	 * Other channels can be opened by connecting and binding this
+	 * session to interfaces from this list.
+	 *
+	 * iface_lock should be taken when accessing any of these fields
+	 */
+	spinlock_t iface_lock;
+	struct cifs_server_iface *iface_list;
+	size_t iface_count;
+	unsigned long iface_last_update; /* jiffies */
 };
 
 static inline bool

fs/cifs/misc.c

@@ -82,6 +82,7 @@ sesInfoAlloc(void)
 		INIT_LIST_HEAD(&ret_buf->smb_ses_list);
 		INIT_LIST_HEAD(&ret_buf->tcon_list);
 		mutex_init(&ret_buf->session_mutex);
+		spin_lock_init(&ret_buf->iface_lock);
 	}
 	return ret_buf;
 }
@@ -102,6 +103,7 @@ sesInfoFree(struct cifs_ses *buf_to_free)
 	kfree(buf_to_free->user_name);
 	kfree(buf_to_free->domainName);
 	kzfree(buf_to_free->auth_key.response);
+	kfree(buf_to_free->iface_list);
 	kzfree(buf_to_free);
 }