diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c index 0da6e9e7132e..8b862a7a6c6a 100644 --- a/samples/bpf/xdp_redirect_cpu_user.c +++ b/samples/bpf/xdp_redirect_cpu_user.c @@ -16,6 +16,10 @@ static const char *__doc__ = #include #include #include +#include + +#define __must_check +#include #include #include @@ -46,6 +50,10 @@ static int cpus_count_map_fd; static int cpus_iterator_map_fd; static int exception_cnt_map_fd; +#define NUM_TP 5 +struct bpf_link *tp_links[NUM_TP] = { 0 }; +static int tp_cnt = 0; + /* Exit return codes */ #define EXIT_OK 0 #define EXIT_FAIL 1 @@ -88,6 +96,10 @@ static void int_exit(int sig) printf("program on interface changed, not removing\n"); } } + /* Detach tracepoints */ + while (tp_cnt) + bpf_link__destroy(tp_links[--tp_cnt]); + exit(EXIT_OK); } @@ -588,23 +600,61 @@ static void stats_poll(int interval, bool use_separators, char *prog_name, free_stats_record(prev); } +static struct bpf_link * attach_tp(struct bpf_object *obj, + const char *tp_category, + const char* tp_name) +{ + struct bpf_program *prog; + struct bpf_link *link; + char sec_name[PATH_MAX]; + int len; + + len = snprintf(sec_name, PATH_MAX, "tracepoint/%s/%s", + tp_category, tp_name); + if (len < 0) + exit(EXIT_FAIL); + + prog = bpf_object__find_program_by_title(obj, sec_name); + if (!prog) { + fprintf(stderr, "ERR: finding progsec: %s\n", sec_name); + exit(EXIT_FAIL_BPF); + } + + link = bpf_program__attach_tracepoint(prog, tp_category, tp_name); + if (IS_ERR(link)) + exit(EXIT_FAIL_BPF); + + return link; +} + +static void init_tracepoints(struct bpf_object *obj) { + tp_links[tp_cnt++] = attach_tp(obj, "xdp", "xdp_redirect_err"); + tp_links[tp_cnt++] = attach_tp(obj, "xdp", "xdp_redirect_map_err"); + tp_links[tp_cnt++] = attach_tp(obj, "xdp", "xdp_exception"); + tp_links[tp_cnt++] = attach_tp(obj, "xdp", "xdp_cpumap_enqueue"); + tp_links[tp_cnt++] = attach_tp(obj, "xdp", "xdp_cpumap_kthread"); +} + static int init_map_fds(struct bpf_object *obj) { - cpu_map_fd = bpf_object__find_map_fd_by_name(obj, "cpu_map"); - rx_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rx_cnt"); + /* Maps updated by tracepoints */ redirect_err_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "redirect_err_cnt"); + exception_cnt_map_fd = + bpf_object__find_map_fd_by_name(obj, "exception_cnt"); cpumap_enqueue_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "cpumap_enqueue_cnt"); cpumap_kthread_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "cpumap_kthread_cnt"); + + /* Maps used by XDP */ + rx_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rx_cnt"); + cpu_map_fd = bpf_object__find_map_fd_by_name(obj, "cpu_map"); cpus_available_map_fd = bpf_object__find_map_fd_by_name(obj, "cpus_available"); cpus_count_map_fd = bpf_object__find_map_fd_by_name(obj, "cpus_count"); cpus_iterator_map_fd = bpf_object__find_map_fd_by_name(obj, "cpus_iterator"); - exception_cnt_map_fd = - bpf_object__find_map_fd_by_name(obj, "exception_cnt"); if (cpu_map_fd < 0 || rx_cnt_map_fd < 0 || redirect_err_cnt_map_fd < 0 || cpumap_enqueue_cnt_map_fd < 0 || @@ -662,6 +712,7 @@ int main(int argc, char **argv) strerror(errno)); return EXIT_FAIL; } + init_tracepoints(obj); if (init_map_fds(obj) < 0) { fprintf(stderr, "bpf_object__find_map_fd_by_name failed\n"); return EXIT_FAIL;