// SPDX-License-Identifier: GPL-2.0

#include <sys/sysinfo.h>
#include <test_progs.h>
#include "network_helpers.h"
#include "netcnt_prog.skel.h"
#include "netcnt_common.h"

#define CG_NAME "/netcnt"

void serial_test_netcnt(void)
{
        union percpu_net_cnt *percpu_netcnt = NULL;
        struct bpf_cgroup_storage_key key;
        int map_fd, percpu_map_fd;
        struct netcnt_prog *skel;
        unsigned long packets;
        union net_cnt netcnt;
        unsigned long bytes;
        int cpu, nproc;
        int cg_fd = -1;
        char cmd[128];

        skel = netcnt_prog__open_and_load();
        if (!ASSERT_OK_PTR(skel, "netcnt_prog__open_and_load"))
                return;

        nproc = bpf_num_possible_cpus();
        percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
        if (!ASSERT_OK_PTR(percpu_netcnt, "malloc(percpu_netcnt)"))
                goto err;

        cg_fd = test__join_cgroup(CG_NAME);
        if (!ASSERT_GE(cg_fd, 0, "test__join_cgroup"))
                goto err;

        skel->links.bpf_nextcnt = bpf_program__attach_cgroup(skel->progs.bpf_nextcnt, cg_fd);
        if (!ASSERT_OK_PTR(skel->links.bpf_nextcnt,
                           "attach_cgroup(bpf_nextcnt)"))
                goto err;

        snprintf(cmd, sizeof(cmd), "%s ::1 -A -c 10000 -q > /dev/null", ping_command(AF_INET6));
        ASSERT_OK(system(cmd), cmd);

        map_fd = bpf_map__fd(skel->maps.netcnt);
        if (!ASSERT_OK(bpf_map_get_next_key(map_fd, NULL, &key), "bpf_map_get_next_key"))
                goto err;

        if (!ASSERT_OK(bpf_map_lookup_elem(map_fd, &key, &netcnt), "bpf_map_lookup_elem(netcnt)"))
                goto err;

        percpu_map_fd = bpf_map__fd(skel->maps.percpu_netcnt);
        if (!ASSERT_OK(bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0]),
                       "bpf_map_lookup_elem(percpu_netcnt)"))
                goto err;

        /* Some packets can be still in per-cpu cache, but not more than
         * MAX_PERCPU_PACKETS.
         */
        packets = netcnt.packets;
        bytes = netcnt.bytes;
        for (cpu = 0; cpu < nproc; cpu++) {
                ASSERT_LE(percpu_netcnt[cpu].packets, MAX_PERCPU_PACKETS, "MAX_PERCPU_PACKETS");

                packets += percpu_netcnt[cpu].packets;
                bytes += percpu_netcnt[cpu].bytes;
        }

        /* No packets should be lost */
        ASSERT_GE(packets, 10000, "packets");

        /* Let's check that bytes counter matches the number of packets
         * multiplied by the size of ipv6 ICMP packet.
         */
        ASSERT_GE(bytes, packets * 104, "bytes");

err:
        if (cg_fd != -1)
                close(cg_fd);
        free(percpu_netcnt);
        netcnt_prog__destroy(skel);
}