bonding: move mode setting into separate function

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 74 insertions, 37 deletions

diff --git a/drivers/net/bonding/Makefile b/drivers/net/bonding/Makefile
index 09e8b2c83afe..5a5d720da929 100644
--- a/drivers/net/bonding/Makefile
+++ b/drivers/net/bonding/Makefile
@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_BONDING) += bonding.o
 
-bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o bond_debugfs.o bond_netlink.o
+bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o bond_debugfs.o bond_netlink.o bond_options.o
 
 proc-$(CONFIG_PROC_FS) += bond_procfs.o
 bonding-objs += $(proc-y)
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
new file mode 100644
index 000000000000..294b7660b054
--- /dev/null
+++ b/drivers/net/bonding/bond_options.c
@@ -0,0 +1,55 @@
+/*
+ * drivers/net/bond/bond_options.c - bonding options
+ * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/if.h>
+#include "bonding.h"
+
+static bool bond_mode_is_valid(int mode)
+{
+        int i;
+
+        for (i = 0; bond_mode_tbl[i].modename; i++);
+
+        return mode >= 0 && mode < i;
+}
+
+int bond_option_mode_set(struct bonding *bond, int mode)
+{
+        if (!bond_mode_is_valid(mode)) {
+                pr_err("invalid mode value %d.\n", mode);
+                return -EINVAL;
+        }
+
+        if (bond->dev->flags & IFF_UP) {
+                pr_err("%s: unable to update mode because interface is up.\n",
+                       bond->dev->name);
+                return -EPERM;
+        }
+
+        if (bond_has_slaves(bond)) {
+                pr_err("%s: unable to update mode because bond has slaves.\n",
+                        bond->dev->name);
+                return -EPERM;
+        }
+
+        if (BOND_MODE_IS_LB(mode) && bond->params.arp_interval) {
+                pr_err("%s: %s mode is incompatible with arp monitoring.\n",
+                       bond->dev->name, bond_mode_tbl[mode].modename);
+                return -EINVAL;
+        }
+
+        /* don't cache arp_validate between modes */
+        bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
+        bond->params.mode = mode;
+        return 0;
+}
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 03bed0ca935e..c234cec10e05 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -283,49 +283,26 @@ static ssize_t bonding_store_mode(struct device *d,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
 {
-        int new_value, ret = count;
+        int new_value, ret;
         struct bonding *bond = to_bond(d);
 
-        if (!rtnl_trylock())
-                return restart_syscall();
-
-        if (bond->dev->flags & IFF_UP) {
-                pr_err("unable to update mode of %s because interface is up.\n",
-                       bond->dev->name);
-                ret = -EPERM;
-                goto out;
-        }
-
-        if (bond_has_slaves(bond)) {
-                pr_err("unable to update mode of %s because it has slaves.\n",
-                        bond->dev->name);
-                ret = -EPERM;
-                goto out;
-        }
-
         new_value = bond_parse_parm(buf, bond_mode_tbl);
         if (new_value < 0)  {
                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
                        bond->dev->name, (int)strlen(buf) - 1, buf);
-                ret = -EINVAL;
-                goto out;
+                return -EINVAL;
         }
-        if ((new_value == BOND_MODE_ALB ||
-             new_value == BOND_MODE_TLB) &&
-            bond->params.arp_interval) {
-                pr_err("%s: %s mode is incompatible with arp monitoring.\n",
-                       bond->dev->name, bond_mode_tbl[new_value].modename);
-                ret = -EINVAL;
-                goto out;
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        ret = bond_option_mode_set(bond, new_value);
+        if (!ret) {
+                pr_info("%s: setting mode to %s (%d).\n",
+                        bond->dev->name, bond_mode_tbl[new_value].modename,
+                        new_value);
+                ret = count;
         }
 
-        /* don't cache arp_validate between modes */
-        bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
-        bond->params.mode = new_value;
-        pr_info("%s: setting mode to %s (%d).\n",
-                bond->dev->name, bond_mode_tbl[new_value].modename,
-                new_value);
-out:
         rtnl_unlock();
         return ret;
 }
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index a2a353bf9ea6..7446849a20c4 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -58,6 +58,11 @@
 #define TX_QUEUE_OVERRIDE(mode)                         \
                         (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
                          ((mode) == BOND_MODE_ROUNDROBIN))
+
+#define BOND_MODE_IS_LB(mode)                   \
+                (((mode) == BOND_MODE_TLB) ||   \
+                 ((mode) == BOND_MODE_ALB))
+
 /*
  * Less bad way to call ioctl from within the kernel; this needs to be
  * done some other way to get the call out of interrupt context.
@@ -259,8 +264,7 @@ static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 
 static inline bool bond_is_lb(const struct bonding *bond)
 {
-        return (bond->params.mode == BOND_MODE_TLB ||
-                bond->params.mode == BOND_MODE_ALB);
+        return BOND_MODE_IS_LB(bond->params.mode);
 }
 
 static inline void bond_set_active_slave(struct slave *slave)
@@ -422,6 +426,7 @@ void bond_setup(struct net_device *bond_dev);
 unsigned int bond_get_num_tx_queues(void);
 int bond_netlink_init(void);
 void bond_netlink_fini(void);
+int bond_option_mode_set(struct bonding *bond, int mode);
 
 struct bond_net {
         struct net *            net;    /* Associated network namespace */