[IPV4]: Consolidate common SNMP code

[deliverable/linux.git] / net / ipv4 / af_inet.c

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index a33ca7e7e8f8e225efc8194be725cfe8f917f870..16aae8ef5555b65855f5437a729c13134cf9739b 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1219,6 +1219,46 @@ out:
        return segs;
 }
 
+unsigned long snmp_fold_field(void *mib[], int offt)
+{
+       unsigned long res = 0;
+       int i;
+
+       for_each_possible_cpu(i) {
+               res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
+               res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
+       }
+       return res;
+}
+EXPORT_SYMBOL_GPL(snmp_fold_field);
+
+int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
+{
+       BUG_ON(ptr == NULL);
+       ptr[0] = __alloc_percpu(mibsize);
+       if (!ptr[0])
+               goto err0;
+       ptr[1] = __alloc_percpu(mibsize);
+       if (!ptr[1])
+               goto err1;
+       return 0;
+err1:
+       free_percpu(ptr[0]);
+       ptr[0] = NULL;
+err0:
+       return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(snmp_mib_init);
+
+void snmp_mib_free(void *ptr[2])
+{
+       BUG_ON(ptr == NULL);
+       free_percpu(ptr[0]);
+       free_percpu(ptr[1]);
+       ptr[0] = ptr[1] = NULL;
+}
+EXPORT_SYMBOL_GPL(snmp_mib_free);
+
 #ifdef CONFIG_IP_MULTICAST
 static struct net_protocol igmp_protocol = {
        .handler =      igmp_rcv,