bpf/prog_tests/netcnt.c

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 #include <sys/sysinfo.h>
0004 #include <test_progs.h>
0005 #include "network_helpers.h"
0006 #include "netcnt_prog.skel.h"
0007 #include "netcnt_common.h"
0008
0009 #define CG_NAME "/netcnt"
0010
0011 void serial_test_netcnt(void)
0012 {
0013     union percpu_net_cnt *percpu_netcnt = NULL;
0014     struct bpf_cgroup_storage_key key;
0015     int map_fd, percpu_map_fd;
0016     struct netcnt_prog *skel;
0017     unsigned long packets;
0018     union net_cnt netcnt;
0019     unsigned long bytes;
0020     int cpu, nproc;
0021     int cg_fd = -1;
0022     char cmd[128];
0023
0024     skel = netcnt_prog__open_and_load();
0025     if (!ASSERT_OK_PTR(skel, "netcnt_prog__open_and_load"))
0026         return;
0027
0028     nproc = bpf_num_possible_cpus();
0029     percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
0030     if (!ASSERT_OK_PTR(percpu_netcnt, "malloc(percpu_netcnt)"))
0031         goto err;
0032
0033     cg_fd = test__join_cgroup(CG_NAME);
0034     if (!ASSERT_GE(cg_fd, 0, "test__join_cgroup"))
0035         goto err;
0036
0037     skel->links.bpf_nextcnt = bpf_program__attach_cgroup(skel->progs.bpf_nextcnt, cg_fd);
0038     if (!ASSERT_OK_PTR(skel->links.bpf_nextcnt,
0039                "attach_cgroup(bpf_nextcnt)"))
0040         goto err;
0041
0042     snprintf(cmd, sizeof(cmd), "%s ::1 -A -c 10000 -q > /dev/null", ping_command(AF_INET6));
0043     ASSERT_OK(system(cmd), cmd);
0044
0045     map_fd = bpf_map__fd(skel->maps.netcnt);
0046     if (!ASSERT_OK(bpf_map_get_next_key(map_fd, NULL, &key), "bpf_map_get_next_key"))
0047         goto err;
0048
0049     if (!ASSERT_OK(bpf_map_lookup_elem(map_fd, &key, &netcnt), "bpf_map_lookup_elem(netcnt)"))
0050         goto err;
0051
0052     percpu_map_fd = bpf_map__fd(skel->maps.percpu_netcnt);
0053     if (!ASSERT_OK(bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0]),
0054                "bpf_map_lookup_elem(percpu_netcnt)"))
0055         goto err;
0056
0057     /* Some packets can be still in per-cpu cache, but not more than
0058      * MAX_PERCPU_PACKETS.
0059      */
0060     packets = netcnt.packets;
0061     bytes = netcnt.bytes;
0062     for (cpu = 0; cpu < nproc; cpu++) {
0063         ASSERT_LE(percpu_netcnt[cpu].packets, MAX_PERCPU_PACKETS, "MAX_PERCPU_PACKETS");
0064
0065         packets += percpu_netcnt[cpu].packets;
0066         bytes += percpu_netcnt[cpu].bytes;
0067     }
0068
0069     /* No packets should be lost */
0070     ASSERT_EQ(packets, 10000, "packets");
0071
0072     /* Let's check that bytes counter matches the number of packets
0073      * multiplied by the size of ipv6 ICMP packet.
0074      */
0075     ASSERT_EQ(bytes, packets * 104, "bytes");
0076
0077 err:
0078     if (cg_fd != -1)
0079         close(cg_fd);
0080     free(percpu_netcnt);
0081     netcnt_prog__destroy(skel);
0082 }