[PATCH net-next v14 3/7] bonding: arp_ip_target helpers.

[David Wilder <wilder@us.ibm.com>]

Adding helpers and defines needed for extending the
arp_ip_target parameters.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 include/net/bonding.h | 52 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/include/net/bonding.h b/include/net/bonding.h
index 3497e5061f90..0537b92c65eb 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -809,4 +809,56 @@ static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *s
 	return NET_XMIT_DROP;
 }
 
+/* Helpers for handling arp_ip_target */
+#define BOND_OPTION_STRING_MAX_SIZE 64
+#define BOND_MAX_VLAN_TAGS 5
+#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
+
+static inline char *bond_arp_target_to_string(const struct bond_arp_target *target,
+					      char *buf, int size)
+{
+	struct bond_vlan_tag *tags = target->tags;
+	int i, num = 0;
+
+	BUILD_BUG_ON(size != BOND_OPTION_STRING_MAX_SIZE);
+
+	if (!(target->flags & BOND_TARGET_USERTAGS)) {
+		num = snprintf(&buf[0], size, "%pI4", &target->target_ip);
+		return buf;
+	}
+
+	num = snprintf(&buf[0], size, "%pI4[", &target->target_ip);
+	if (tags) {
+		for (i = 0; (tags[i].vlan_proto != BOND_VLAN_PROTO_NONE); i++) {
+			if (!tags[i].vlan_id)
+				continue;
+			if (i != 0)
+				num = num + snprintf(&buf[num], size - num, "/");
+			num = num + snprintf(&buf[num], size - num, "%u",
+					     tags[i].vlan_id);
+		}
+	}
+	snprintf(&buf[num], size - num, "]");
+	return buf;
+}
+
+static inline void bond_free_vlan_tag(struct bond_arp_target *target)
+{
+	struct bond_vlan_tag *tags = target->tags;
+
+	target->tags = NULL;
+	target->flags = 0;
+	kfree(tags);
+}
+
+static inline void __bond_free_vlan_tags(struct bond_arp_target *targets)
+{
+	int i;
+
+	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i].tags; i++)
+		bond_free_vlan_tag(&targets[i]);
+}
+
+#define bond_free_vlan_tags(targets)  __bond_free_vlan_tags(targets)
+
 #endif /* _NET_BONDING_H */
-- 
2.50.1