this is a clone repo I had https://github.com/vincentmli/XDPeriments/blob/master/Cookies/xdp_dns_cookies_kern.c and i am trying to initialize the tail call program array map statically instead of running user space eBPF loader to populate the program array map like https://github.com/vincentmli/XDPeriments/blob/master/Cookies/xdp_dns_cookies_user.c
here is the program array map I modified as below
https://github.com/vincentmli/XDPeriments/blob/master/Cookies/xdp_dns_cookies_kern.c#L659-L671
struct {
__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
__uint(max_entries, 3);
__uint(key_size, sizeof(uint32_t));
__uint(value_size, sizeof(uint64_t));
__array(values, int (void *));
} jmp_rate_table SEC(".maps") = {
.values = {
[DO_RATE_LIMIT_IPV6] = (void *)&xdp_do_rate_limit_ipv6,
[DO_RATE_LIMIT_IPV4] = (void *)&xdp_do_rate_limit_ipv4,
},
};
Note I had to use gcc to compile the xdp_dns_cookies_user to load the program https://github.com/NLnetLabs/XDPeriments/issues/6
root@vincent-pc2:/home/vincent/go/src/github.com/vincentmli/XDPeriments/Cookies# ./xdp_dns_cookies_user
libbpf: map 'jmp_rate_table': should be map-in-map.
ERROR: opening BPF object file failed
(null) successfully loaded and running on interface lo.
Press Ctrl-C to stop and unload.
^C
you can see libbpf indicates that the jmp_rate_table should be map-in-map table, am I initializing the map wrong?
