bonding: fix bond_arp_rcv setting and arp validate desync state

We make bond_arp_rcv global so it can be used in bond_sysfs if the bond
interface is up and arp_interval is being changed to a positive value
and cleared otherwise as per Jay's suggestion.
This also fixes a problem where bond_arp_rcv was set even though
arp_validate was disabled while the bond was up by unsetting recv_probe
in bond_store_arp_validate and respectively setting it if enabled.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Acked-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 39e5b1c..72df399 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2404,8 +2404,8 @@ static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32
        slave->target_last_arp_rx[i] = jiffies;
 }
 
-static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
-                       struct slave *slave)
+int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
+                struct slave *slave)
 {
        struct arphdr *arp = (struct arphdr *)skb->data;
        unsigned char *arp_ptr;

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 4e38683..eeab40b 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -349,6 +349,8 @@ static ssize_t bonding_store_mode(struct device *d,
                goto out;
        }
 
+       /* don't cache arp_validate between modes */
+       bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
        bond->params.mode = new_value;
        bond_set_mode_ops(bond, bond->params.mode);
        pr_info("%s: setting mode to %s (%d).\n",
@@ -419,8 +421,8 @@ static ssize_t bonding_store_arp_validate(struct device *d,
                                          struct device_attribute *attr,
                                          const char *buf, size_t count)
 {
-       int new_value, ret = count;
        struct bonding *bond = to_bond(d);
+       int new_value, ret = count;
 
        if (!rtnl_trylock())
                return restart_syscall();
@@ -431,7 +433,7 @@ static ssize_t bonding_store_arp_validate(struct device *d,
                ret = -EINVAL;
                goto out;
        }
-       if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
+       if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
                pr_err("%s: arp_validate only supported in active-backup mode.\n",
                       bond->dev->name);
                ret = -EINVAL;
@@ -441,6 +443,12 @@ static ssize_t bonding_store_arp_validate(struct device *d,
                bond->dev->name, arp_validate_tbl[new_value].modename,
                new_value);
 
+       if (bond->dev->flags & IFF_UP) {
+               if (!new_value)
+                       bond->recv_probe = NULL;
+               else if (bond->params.arp_interval)
+                       bond->recv_probe = bond_arp_rcv;
+       }
        bond->params.arp_validate = new_value;
 out:
        rtnl_unlock();
@@ -561,8 +569,8 @@ static ssize_t bonding_store_arp_interval(struct device *d,
                                          struct device_attribute *attr,
                                          const char *buf, size_t count)
 {
-       int new_value, ret = count;
        struct bonding *bond = to_bond(d);
+       int new_value, ret = count;
 
        if (!rtnl_trylock())
                return restart_syscall();
@@ -605,8 +613,13 @@ static ssize_t bonding_store_arp_interval(struct device *d,
                 * is called.
                 */
                if (!new_value) {
+                       if (bond->params.arp_validate)
+                               bond->recv_probe = NULL;
                        cancel_delayed_work_sync(&bond->arp_work);
                } else {
+                       /* arp_validate can be set only in active-backup mode */
+                       if (bond->params.arp_validate)
+                               bond->recv_probe = bond_arp_rcv;
                        cancel_delayed_work_sync(&bond->mii_work);
                        queue_delayed_work(bond->wq, &bond->arp_work, 0);
                }

diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index f7ab161..7ad8bd5 100644 (file)
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -430,6 +430,7 @@ static inline bool slave_can_tx(struct slave *slave)
 
 struct bond_net;
 
+int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id);