Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / net / team / team_mode_activebackup.c

diff --git a/kernel/drivers/net/team/team_mode_activebackup.c b/kernel/drivers/net/team/team_mode_activebackup.c
new file mode 100644 (file)
index 0000000..40fd338
--- /dev/null
+++ b/kernel/drivers/net/team/team_mode_activebackup.c
@@ -0,0 +1,148 @@
+/*
+ * drivers/net/team/team_mode_activebackup.c - Active-backup mode for team
+ * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <net/rtnetlink.h>
+#include <linux/if_team.h>
+
+struct ab_priv {
+       struct team_port __rcu *active_port;
+       struct team_option_inst_info *ap_opt_inst_info;
+};
+
+static struct ab_priv *ab_priv(struct team *team)
+{
+       return (struct ab_priv *) &team->mode_priv;
+}
+
+static rx_handler_result_t ab_receive(struct team *team, struct team_port *port,
+                                     struct sk_buff *skb) {
+       struct team_port *active_port;
+
+       active_port = rcu_dereference(ab_priv(team)->active_port);
+       if (active_port != port)
+               return RX_HANDLER_EXACT;
+       return RX_HANDLER_ANOTHER;
+}
+
+static bool ab_transmit(struct team *team, struct sk_buff *skb)
+{
+       struct team_port *active_port;
+
+       active_port = rcu_dereference_bh(ab_priv(team)->active_port);
+       if (unlikely(!active_port))
+               goto drop;
+       if (team_dev_queue_xmit(team, active_port, skb))
+               return false;
+       return true;
+
+drop:
+       dev_kfree_skb_any(skb);
+       return false;
+}
+
+static void ab_port_leave(struct team *team, struct team_port *port)
+{
+       if (ab_priv(team)->active_port == port) {
+               RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
+               team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info);
+       }
+}
+
+static int ab_active_port_init(struct team *team,
+                              struct team_option_inst_info *info)
+{
+       ab_priv(team)->ap_opt_inst_info = info;
+       return 0;
+}
+
+static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
+{
+       struct team_port *active_port;
+
+       active_port = rcu_dereference_protected(ab_priv(team)->active_port,
+                                               lockdep_is_held(&team->lock));
+       if (active_port)
+               ctx->data.u32_val = active_port->dev->ifindex;
+       else
+               ctx->data.u32_val = 0;
+       return 0;
+}
+
+static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
+{
+       struct team_port *port;
+
+       list_for_each_entry(port, &team->port_list, list) {
+               if (port->dev->ifindex == ctx->data.u32_val) {
+                       rcu_assign_pointer(ab_priv(team)->active_port, port);
+                       return 0;
+               }
+       }
+       return -ENOENT;
+}
+
+static const struct team_option ab_options[] = {
+       {
+               .name = "activeport",
+               .type = TEAM_OPTION_TYPE_U32,
+               .init = ab_active_port_init,
+               .getter = ab_active_port_get,
+               .setter = ab_active_port_set,
+       },
+};
+
+static int ab_init(struct team *team)
+{
+       return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
+}
+
+static void ab_exit(struct team *team)
+{
+       team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
+}
+
+static const struct team_mode_ops ab_mode_ops = {
+       .init                   = ab_init,
+       .exit                   = ab_exit,
+       .receive                = ab_receive,
+       .transmit               = ab_transmit,
+       .port_leave             = ab_port_leave,
+};
+
+static const struct team_mode ab_mode = {
+       .kind           = "activebackup",
+       .owner          = THIS_MODULE,
+       .priv_size      = sizeof(struct ab_priv),
+       .ops            = &ab_mode_ops,
+};
+
+static int __init ab_init_module(void)
+{
+       return team_mode_register(&ab_mode);
+}
+
+static void __exit ab_cleanup_module(void)
+{
+       team_mode_unregister(&ab_mode);
+}
+
+module_init(ab_init_module);
+module_exit(ab_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
+MODULE_DESCRIPTION("Active-backup mode for team");
+MODULE_ALIAS("team-mode-activebackup");