function::ipmib_filter_key.3stap man page
function::ipmib_filter_key — Default filter function for ipmib.* probes
pointer to the struct sk_buff
value to be counted if skb passes the filter
1 is local operation and 0 is non-local operation
This function is a default filter function. The user can replace this function with their own. The user-supplied filter function returns an index key based on the values in skb. A return value of 0 means this particular skb should be not be counted.