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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <uapi/linux/bpf.h>
   3 #include <linux/if_link.h>
   4 #include <test_progs.h>
   5 #include <network_helpers.h>
   6
   7 #include "test_xdp_with_cpumap_frags_helpers.skel.h"
   8 #include "test_xdp_with_cpumap_helpers.skel.h"
   9
  10 #define IFINDEX_LO      1
  11 #define TEST_NS "cpu_attach_ns"
  12
  13 static void test_xdp_with_cpumap_helpers(void)
  14 {
  15         struct test_xdp_with_cpumap_helpers *skel = NULL;
  16         struct bpf_prog_info info = {};
  17         __u32 len = sizeof(info);
  18         struct bpf_cpumap_val val = {
  19                 .qsize = 192,
  20         };
  21         int err, prog_fd, prog_redir_fd, map_fd;
  22         struct nstoken *nstoken = NULL;
  23         __u32 idx = 0;
  24
  25         SYS(out_close, "ip netns add %s", TEST_NS);
  26         nstoken = open_netns(TEST_NS);
  27         if (!ASSERT_OK_PTR(nstoken, "open_netns"))
  28                 goto out_close;
  29         SYS(out_close, "ip link set dev lo up");
  30
  31         skel = test_xdp_with_cpumap_helpers__open_and_load();
  32         if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
  33                 return;
  34
  35         prog_redir_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
  36         err = bpf_xdp_attach(IFINDEX_LO, prog_redir_fd, XDP_FLAGS_SKB_MODE, NULL);
  37         if (!ASSERT_OK(err, "Generic attach of program with 8-byte CPUMAP"))
  38                 goto out_close;
  39
  40         prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
  41         map_fd = bpf_map__fd(skel->maps.cpu_map);
  42         err = bpf_prog_get_info_by_fd(prog_fd, &info, &len);
  43         if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
  44                 goto out_close;
  45
  46         val.bpf_prog.fd = prog_fd;
  47         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  48         ASSERT_OK(err, "Add program to cpumap entry");
  49
  50         err = bpf_map_lookup_elem(map_fd, &idx, &val);
  51         ASSERT_OK(err, "Read cpumap entry");
  52         ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to cpumap entry prog_id");
  53
  54         /* send a packet to trigger any potential bugs in there */
  55         char data[10] = {};
  56         DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
  57                             .data_in = &data,
  58                             .data_size_in = 10,
  59                             .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
  60                             .repeat = 1,
  61                 );
  62         err = bpf_prog_test_run_opts(prog_redir_fd, &opts);
  63         ASSERT_OK(err, "XDP test run");
  64
  65         /* wait for the packets to be flushed, then check that redirect has been
  66          * performed
  67          */
  68         kern_sync_rcu();
  69         ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");
  70
  71         err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
  72         ASSERT_OK(err, "XDP program detach");
  73
  74         /* can not attach BPF_XDP_CPUMAP program to a device */
  75         err = bpf_xdp_attach(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE, NULL);
  76         if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_CPUMAP program"))
  77                 bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
  78
  79         val.qsize = 192;
  80         val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
  81         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  82         ASSERT_NEQ(err, 0, "Add non-BPF_XDP_CPUMAP program to cpumap entry");
  83
  84         /* Try to attach BPF_XDP program with frags to cpumap when we have
  85          * already loaded a BPF_XDP program on the map
  86          */
  87         idx = 1;
  88         val.qsize = 192;
  89         val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
  90         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  91         ASSERT_NEQ(err, 0, "Add BPF_XDP program with frags to cpumap entry");
  92
  93 out_close:
  94         close_netns(nstoken);
  95         SYS_NOFAIL("ip netns del %s", TEST_NS);
  96         test_xdp_with_cpumap_helpers__destroy(skel);
  97 }
  98
  99 static void test_xdp_with_cpumap_frags_helpers(void)
 100 {
 101         struct test_xdp_with_cpumap_frags_helpers *skel;
 102         struct bpf_prog_info info = {};
 103         __u32 len = sizeof(info);
 104         struct bpf_cpumap_val val = {
 105                 .qsize = 192,
 106         };
 107         int err, frags_prog_fd, map_fd;
 108         __u32 idx = 0;
 109
 110         skel = test_xdp_with_cpumap_frags_helpers__open_and_load();
 111         if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
 112                 return;
 113
 114         frags_prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
 115         map_fd = bpf_map__fd(skel->maps.cpu_map);
 116         err = bpf_prog_get_info_by_fd(frags_prog_fd, &info, &len);
 117         if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
 118                 goto out_close;
 119
 120         val.bpf_prog.fd = frags_prog_fd;
 121         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
 122         ASSERT_OK(err, "Add program to cpumap entry");
 123
 124         err = bpf_map_lookup_elem(map_fd, &idx, &val);
 125         ASSERT_OK(err, "Read cpumap entry");
 126         ASSERT_EQ(info.id, val.bpf_prog.id,
 127                   "Match program id to cpumap entry prog_id");
 128
 129         /* Try to attach BPF_XDP program to cpumap when we have
 130          * already loaded a BPF_XDP program with frags on the map
 131          */
 132         idx = 1;
 133         val.qsize = 192;
 134         val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
 135         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
 136         ASSERT_NEQ(err, 0, "Add BPF_XDP program to cpumap entry");
 137
 138 out_close:
 139         test_xdp_with_cpumap_frags_helpers__destroy(skel);
 140 }
 141
 142 void test_xdp_cpumap_attach(void)
 143 {
 144         if (test__start_subtest("CPUMAP with programs in entries"))
 145                 test_xdp_with_cpumap_helpers();
 146
 147         if (test__start_subtest("CPUMAP with frags programs in entries"))
 148                 test_xdp_with_cpumap_frags_helpers();
 149 }