tools/testing/selftests/bpf/prog_tests/netcnt.c

   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
  11 void serial_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 = bpf_num_possible_cpus();
  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_GE(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_GE(bytes, packets * 104, "bytes");
  76
  77 err:
  78         if (cg_fd != -1)
  79                 close(cg_fd);
  80         free(percpu_netcnt);
  81         netcnt_prog__destroy(skel);
  82 }