bonding: add downdelay netlink support

Add IFLA_BOND_DOWNDELAY to allow get/set of bonding parameter
downdelay via netlink.

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

5 files changed, 52 insertions, 31 deletions

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 086cf4f5f0a6..a0a2e8c32fe5 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -26,6 +26,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
         [IFLA_BOND_ACTIVE_SLAVE]        = { .type = NLA_U32 },
         [IFLA_BOND_MIIMON]              = { .type = NLA_U32 },
         [IFLA_BOND_UPDELAY]             = { .type = NLA_U32 },
+        [IFLA_BOND_DOWNDELAY]           = { .type = NLA_U32 },
 };
 
 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -85,6 +86,13 @@ static int bond_changelink(struct net_device *bond_dev,
                 if (err)
                         return err;
         }
+        if (data[IFLA_BOND_DOWNDELAY]) {
+                int downdelay = nla_get_u32(data[IFLA_BOND_DOWNDELAY]);
+
+                err = bond_option_downdelay_set(bond, downdelay);
+                if (err)
+                        return err;
+        }
         return 0;
 }
 
@@ -106,6 +114,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_ACTIVE_SLAVE */
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_MIIMON */
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_UPDELAY */
+                nla_total_size(sizeof(u32)) +   /* IFLA_BOND_DOWNDELAY */
                 0;
 }
 
@@ -129,6 +138,10 @@ static int bond_fill_info(struct sk_buff *skb,
                         bond->params.updelay * bond->params.miimon))
                 goto nla_put_failure;
 
+        if (nla_put_u32(skb, IFLA_BOND_DOWNDELAY,
+                        bond->params.downdelay * bond->params.miimon))
+                goto nla_put_failure;
+
         return 0;
 
 nla_put_failure:
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index ae94b847ffcc..2914d649ee34 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -216,3 +216,32 @@ int bond_option_updelay_set(struct bonding *bond, int updelay)
 
         return 0;
 }
+
+int bond_option_downdelay_set(struct bonding *bond, int downdelay)
+{
+        if (!(bond->params.miimon)) {
+                pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
+                       bond->dev->name);
+                return -EPERM;
+        }
+
+        if (downdelay < 0) {
+                pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
+                       bond->dev->name, downdelay, 0, INT_MAX);
+                return -EINVAL;
+        } else {
+                if ((downdelay % bond->params.miimon) != 0) {
+                        pr_warn("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
+                                bond->dev->name, downdelay,
+                                bond->params.miimon,
+                                (downdelay / bond->params.miimon) *
+                                bond->params.miimon);
+                }
+                bond->params.downdelay = downdelay / bond->params.miimon;
+                pr_info("%s: Setting down delay to %d.\n",
+                        bond->dev->name,
+                        bond->params.downdelay * bond->params.miimon);
+        }
+
+        return 0;
+}
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 4dcbec4e07c0..bec20bc08d31 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -689,44 +689,21 @@ static ssize_t bonding_store_downdelay(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->params.miimon)) {
-                pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
-                       bond->dev->name);
-                ret = -EPERM;
-                goto out;
-        }
-
         if (sscanf(buf, "%d", &new_value) != 1) {
                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
-                ret = -EINVAL;
-                goto out;
+                return -EINVAL;
         }
-        if (new_value < 0) {
-                pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
-                       bond->dev->name, new_value, 0, INT_MAX);
-                ret = -EINVAL;
-                goto out;
-        } else {
-                if ((new_value % bond->params.miimon) != 0) {
-                        pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
-                                   bond->dev->name, new_value,
-                                   bond->params.miimon,
-                                   (new_value / bond->params.miimon) *
-                                   bond->params.miimon);
-                }
-                bond->params.downdelay = new_value / bond->params.miimon;
-                pr_info("%s: Setting down delay to %d.\n",
-                        bond->dev->name,
-                        bond->params.downdelay * bond->params.miimon);
 
-        }
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        ret = bond_option_downdelay_set(bond, new_value);
+        if (!ret)
+                ret = count;
 
-out:
         rtnl_unlock();
         return ret;
 }
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 8a91f7187e51..f5749b18d168 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -441,6 +441,7 @@ int bond_option_mode_set(struct bonding *bond, int mode);
 int bond_option_active_slave_set(struct bonding *bond, struct net_device *slave_dev);
 int bond_option_miimon_set(struct bonding *bond, int miimon);
 int bond_option_updelay_set(struct bonding *bond, int updelay);
+int bond_option_downdelay_set(struct bonding *bond, int downdelay);
 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 struct net_device *bond_option_active_slave_get(struct bonding *bond);
 
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 7588c8120e7f..f95506777710 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -333,6 +333,7 @@ enum {
         IFLA_BOND_ACTIVE_SLAVE,
         IFLA_BOND_MIIMON,
         IFLA_BOND_UPDELAY,
+        IFLA_BOND_DOWNDELAY,
         __IFLA_BOND_MAX,
 };