team: add loadbalance mode

This patch introduces new team mode. It's TX port is selected by
user-set BPF hash function.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/team/Kconfig b/drivers/net/team/Kconfig
index 248a144..89024d5 100644 (file)
--- a/drivers/net/team/Kconfig
+++ b/drivers/net/team/Kconfig
@@ -40,4 +40,15 @@ config NET_TEAM_MODE_ACTIVEBACKUP
          To compile this team mode as a module, choose M here: the module
          will be called team_mode_activebackup.
 
+config NET_TEAM_MODE_LOADBALANCE
+       tristate "Load-balance mode support"
+       depends on NET_TEAM
+       ---help---
+         This mode provides load balancing functionality. Tx port selection
+         is done using BPF function set up from userspace (bpf_hash_func
+         option)
+
+         To compile this team mode as a module, choose M here: the module
+         will be called team_mode_loadbalance.
+
 endif # NET_TEAM

diff --git a/drivers/net/team/Makefile b/drivers/net/team/Makefile
index 85f2028..fb9f4c1 100644 (file)
--- a/drivers/net/team/Makefile
+++ b/drivers/net/team/Makefile
@@ -5,3 +5,4 @@
 obj-$(CONFIG_NET_TEAM) += team.o
 obj-$(CONFIG_NET_TEAM_MODE_ROUNDROBIN) += team_mode_roundrobin.o
 obj-$(CONFIG_NET_TEAM_MODE_ACTIVEBACKUP) += team_mode_activebackup.o
+obj-$(CONFIG_NET_TEAM_MODE_LOADBALANCE) += team_mode_loadbalance.o

diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
new file mode 100644 (file)
index 0000000..ed20f39
--- /dev/null
+++ b/drivers/net/team/team_mode_loadbalance.c
@@ -0,0 +1,188 @@
+/*
+ * drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
+ * Copyright (c) 2012 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 <linux/filter.h>
+#include <linux/if_team.h>
+
+struct lb_priv {
+       struct sk_filter __rcu *fp;
+       struct sock_fprog *orig_fprog;
+};
+
+static struct lb_priv *lb_priv(struct team *team)
+{
+       return (struct lb_priv *) &team->mode_priv;
+}
+
+static bool lb_transmit(struct team *team, struct sk_buff *skb)
+{
+       struct sk_filter *fp;
+       struct team_port *port;
+       unsigned int hash;
+       int port_index;
+
+       fp = rcu_dereference(lb_priv(team)->fp);
+       if (unlikely(!fp))
+               goto drop;
+       hash = SK_RUN_FILTER(fp, skb);
+       port_index = hash % team->port_count;
+       port = team_get_port_by_index_rcu(team, port_index);
+       if (unlikely(!port))
+               goto drop;
+       skb->dev = port->dev;
+       if (dev_queue_xmit(skb))
+               return false;
+       return true;
+
+drop:
+       dev_kfree_skb_any(skb);
+       return false;
+}
+
+static int lb_bpf_func_get(struct team *team, void *arg)
+{
+       struct team_option_binary *tbinary = team_optarg_tbinary(arg);
+
+       memset(tbinary, 0, sizeof(*tbinary));
+       if (!lb_priv(team)->orig_fprog)
+               return 0;
+
+       tbinary->data_len = lb_priv(team)->orig_fprog->len *
+                           sizeof(struct sock_filter);
+       tbinary->data = lb_priv(team)->orig_fprog->filter;
+       return 0;
+}
+
+static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,
+                         void *data)
+{
+       struct sock_fprog *fprog;
+       struct sock_filter *filter = (struct sock_filter *) data;
+
+       if (data_len % sizeof(struct sock_filter))
+               return -EINVAL;
+       fprog = kmalloc(sizeof(struct sock_fprog), GFP_KERNEL);
+       if (!fprog)
+               return -ENOMEM;
+       fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
+       if (!fprog->filter) {
+               kfree(fprog);
+               return -ENOMEM;
+       }
+       fprog->len = data_len / sizeof(struct sock_filter);
+       *pfprog = fprog;
+       return 0;
+}
+
+static void __fprog_destroy(struct sock_fprog *fprog)
+{
+       kfree(fprog->filter);
+       kfree(fprog);
+}
+
+static int lb_bpf_func_set(struct team *team, void *arg)
+{
+       struct team_option_binary *tbinary = team_optarg_tbinary(arg);
+       struct sk_filter *fp = NULL;
+       struct sock_fprog *fprog = NULL;
+       int err;
+
+       if (tbinary->data_len) {
+               err = __fprog_create(&fprog, tbinary->data_len,
+                                    tbinary->data);
+               if (err)
+                       return err;
+               err = sk_unattached_filter_create(&fp, fprog);
+               if (err) {
+                       __fprog_destroy(fprog);
+                       return err;
+               }
+       }
+
+       if (lb_priv(team)->orig_fprog) {
+               /* Clear old filter data */
+               __fprog_destroy(lb_priv(team)->orig_fprog);
+               sk_unattached_filter_destroy(lb_priv(team)->fp);
+       }
+
+       rcu_assign_pointer(lb_priv(team)->fp, fp);
+       lb_priv(team)->orig_fprog = fprog;
+       return 0;
+}
+
+static const struct team_option lb_options[] = {
+       {
+               .name = "bpf_hash_func",
+               .type = TEAM_OPTION_TYPE_BINARY,
+               .getter = lb_bpf_func_get,
+               .setter = lb_bpf_func_set,
+       },
+};
+
+int lb_init(struct team *team)
+{
+       return team_options_register(team, lb_options,
+                                    ARRAY_SIZE(lb_options));
+}
+
+void lb_exit(struct team *team)
+{
+       team_options_unregister(team, lb_options,
+                               ARRAY_SIZE(lb_options));
+}
+
+static int lb_port_enter(struct team *team, struct team_port *port)
+{
+       return team_port_set_team_mac(port);
+}
+
+static void lb_port_change_mac(struct team *team, struct team_port *port)
+{
+       team_port_set_team_mac(port);
+}
+
+static const struct team_mode_ops lb_mode_ops = {
+       .init                   = lb_init,
+       .exit                   = lb_exit,
+       .transmit               = lb_transmit,
+       .port_enter             = lb_port_enter,
+       .port_change_mac        = lb_port_change_mac,
+};
+
+static struct team_mode lb_mode = {
+       .kind           = "loadbalance",
+       .owner          = THIS_MODULE,
+       .priv_size      = sizeof(struct lb_priv),
+       .ops            = &lb_mode_ops,
+};
+
+static int __init lb_init_module(void)
+{
+       return team_mode_register(&lb_mode);
+}
+
+static void __exit lb_cleanup_module(void)
+{
+       team_mode_unregister(&lb_mode);
+}
+
+module_init(lb_init_module);
+module_exit(lb_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
+MODULE_DESCRIPTION("Load-balancing mode for team");
+MODULE_ALIAS("team-mode-loadbalance");