bonding: add xmit_hash_policy attribute netlink support

Add IFLA_BOND_XMIT_HASH_POLICY to allow get/set of bonding parameter
xmit_hash_policy via netlink.

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

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index dc465ad..67acd21 100644 (file)
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -35,6 +35,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
        [IFLA_BOND_PRIMARY]             = { .type = NLA_U32 },
        [IFLA_BOND_PRIMARY_RESELECT]    = { .type = NLA_U8 },
        [IFLA_BOND_FAIL_OVER_MAC]       = { .type = NLA_U8 },
+       [IFLA_BOND_XMIT_HASH_POLICY]    = { .type = NLA_U8 },
 };
 
 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -186,6 +187,14 @@ static int bond_changelink(struct net_device *bond_dev,
                if (err)
                        return err;
        }
+       if (data[IFLA_BOND_XMIT_HASH_POLICY]) {
+               int xmit_hash_policy =
+                       nla_get_u8(data[IFLA_BOND_XMIT_HASH_POLICY]);
+
+               err = bond_option_xmit_hash_policy_set(bond, xmit_hash_policy);
+               if (err)
+                       return err;
+       }
        return 0;
 }
 
@@ -217,6 +226,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
                nla_total_size(sizeof(u32)) +   /* IFLA_BOND_PRIMARY */
                nla_total_size(sizeof(u8)) +    /* IFLA_BOND_PRIMARY_RESELECT */
                nla_total_size(sizeof(u8)) +    /* IFLA_BOND_FAIL_OVER_MAC */
+               nla_total_size(sizeof(u8)) +    /* IFLA_BOND_XMIT_HASH_POLICY */
                0;
 }
 
@@ -289,6 +299,10 @@ static int bond_fill_info(struct sk_buff *skb,
                       bond->params.fail_over_mac))
                goto nla_put_failure;
 
+       if (nla_put_u8(skb, IFLA_BOND_XMIT_HASH_POLICY,
+                      bond->params.xmit_policy))
+               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 86f4620..8510c6d 100644 (file)
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -551,3 +551,13 @@ int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac)
 
        return 0;
 }
+
+int bond_option_xmit_hash_policy_set(struct bonding *bond, int xmit_hash_policy)
+{
+       bond->params.xmit_policy = xmit_hash_policy;
+       pr_info("%s: setting xmit hash policy to %s (%d).\n",
+               bond->dev->name,
+               xmit_hashtype_tbl[xmit_hash_policy].modename, xmit_hash_policy);
+
+       return 0;
+}

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index c84a90f..4c75322 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -318,7 +318,7 @@ static ssize_t bonding_store_xmit_hash(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);
 
        new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
@@ -326,14 +326,17 @@ static ssize_t bonding_store_xmit_hash(struct device *d,
                pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
                       bond->dev->name,
                       (int)strlen(buf) - 1, buf);
-               ret = -EINVAL;
-       } else {
-               bond->params.xmit_policy = new_value;
-               pr_info("%s: setting xmit hash policy to %s (%d).\n",
-                       bond->dev->name,
-                       xmit_hashtype_tbl[new_value].modename, new_value);
+               return -EINVAL;
        }
 
+       if (!rtnl_trylock())
+               return restart_syscall();
+
+       ret = bond_option_xmit_hash_policy_set(bond, new_value);
+       if (!ret)
+               ret = count;
+
+       rtnl_unlock();
        return ret;
 }
 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,

diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index b69059b..4cb603e 100644 (file)
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -458,6 +458,8 @@ int bond_option_primary_set(struct bonding *bond, const char *primary);
 int bond_option_primary_reselect_set(struct bonding *bond,
                                     int primary_reselect);
 int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac);
+int bond_option_xmit_hash_policy_set(struct bonding *bond,
+                                    int xmit_hash_policy);
 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 fd181ab..1a5d394 100644 (file)
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -342,6 +342,7 @@ enum {
        IFLA_BOND_PRIMARY,
        IFLA_BOND_PRIMARY_RESELECT,
        IFLA_BOND_FAIL_OVER_MAC,
+       IFLA_BOND_XMIT_HASH_POLICY,
        __IFLA_BOND_MAX,
 };