LXR linux/tools/testing/selftests/bpf/prog

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <sys/sysinfo.h>
   4#include <test_progs.h>
   5#include "network_helpers.h"
   6#include "netcnt_prog.skel.h"
   7#include "netcnt_common.h"
   8
   9#define CG_NAME "/netcnt"
  10
  11void test_netcnt(void)
  12{
  13        union percpu_net_cnt *percpu_netcnt = NULL;
  14        struct bpf_cgroup_storage_key key;
  15        int map_fd, percpu_map_fd;
  16        struct netcnt_prog *skel;
  17        unsigned long packets;
  18        union net_cnt netcnt;
  19        unsigned long bytes;
  20        int cpu, nproc;
  21        int cg_fd = -1;
  22        char cmd[128];
  23
  24        skel = netcnt_prog__open_and_load();
  25        if (!ASSERT_OK_PTR(skel, "netcnt_prog__open_and_load"))
  26                return;
  27
  28        nproc = get_nprocs_conf();
  29        percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
  30        if (!ASSERT_OK_PTR(percpu_netcnt, "malloc(percpu_netcnt)"))
  31                goto err;
  32
  33        cg_fd = test__join_cgroup(CG_NAME);
  34        if (!ASSERT_GE(cg_fd, 0, "test__join_cgroup"))
  35                goto err;
  36
  37        skel->links.bpf_nextcnt = bpf_program__attach_cgroup(skel->progs.bpf_nextcnt, cg_fd);
  38        if (!ASSERT_OK_PTR(skel->links.bpf_nextcnt,
  39                           "attach_cgroup(bpf_nextcnt)"))
  40                goto err;
  41
  42        snprintf(cmd, sizeof(cmd), "%s ::1 -A -c 10000 -q > /dev/null", ping_command(AF_INET6));
  43        ASSERT_OK(system(cmd), cmd);
  44
  45        map_fd = bpf_map__fd(skel->maps.netcnt);
  46        if (!ASSERT_OK(bpf_map_get_next_key(map_fd, NULL, &key), "bpf_map_get_next_key"))
  47                goto err;
  48
  49        if (!ASSERT_OK(bpf_map_lookup_elem(map_fd, &key, &netcnt), "bpf_map_lookup_elem(netcnt)"))
  50                goto err;
  51
  52        percpu_map_fd = bpf_map__fd(skel->maps.percpu_netcnt);
  53        if (!ASSERT_OK(bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0]),
  54                       "bpf_map_lookup_elem(percpu_netcnt)"))
  55                goto err;
  56
  57        /* Some packets can be still in per-cpu cache, but not more than
  58         * MAX_PERCPU_PACKETS.
  59         */
  60        packets = netcnt.packets;
  61        bytes = netcnt.bytes;
  62        for (cpu = 0; cpu < nproc; cpu++) {
  63                ASSERT_LE(percpu_netcnt[cpu].packets, MAX_PERCPU_PACKETS, "MAX_PERCPU_PACKETS");
  64
  65                packets += percpu_netcnt[cpu].packets;
  66                bytes += percpu_netcnt[cpu].bytes;
  67        }
  68
  69        /* No packets should be lost */
  70        ASSERT_EQ(packets, 10000, "packets");
  71
  72        /* Let's check that bytes counter matches the number of packets
  73         * multiplied by the size of ipv6 ICMP packet.
  74         */
  75        ASSERT_EQ(bytes, packets * 104, "bytes");
  76
  77err:
  78        if (cg_fd != -1)
  79                close(cg_fd);
  80        free(percpu_netcnt);
  81        netcnt_prog__destroy(skel);
  82}
  83