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samples: bpf: Add xdp_exception tracepoint statistics support
This implements the retrieval and printing, as well the help output. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210821002010.845777-8-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi
Alexei Starovoitov
parent
451588764e
commit
82c450803a
@ -74,6 +74,7 @@
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enum map_type {
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MAP_RX,
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MAP_REDIRECT_ERR,
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MAP_EXCEPTION,
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NUM_MAP,
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};
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@ -98,6 +99,7 @@ struct map_entry {
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struct stats_record {
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struct record rx_cnt;
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struct record redir_err[XDP_REDIRECT_ERR_MAX];
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struct record exception[XDP_ACTION_MAX];
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};
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struct sample_output {
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@ -115,6 +117,9 @@ struct sample_output {
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__u64 suc;
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__u64 err;
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} redir_cnt;
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struct {
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__u64 hits;
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} except_cnt;
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};
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struct xdp_desc {
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@ -156,6 +161,15 @@ static const char *xdp_redirect_err_help[XDP_REDIRECT_ERR_MAX - 1] = {
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"No space in ptr_ring of cpumap kthread",
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};
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static const char *xdp_action_names[XDP_ACTION_MAX] = {
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[XDP_ABORTED] = "XDP_ABORTED",
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[XDP_DROP] = "XDP_DROP",
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[XDP_PASS] = "XDP_PASS",
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[XDP_TX] = "XDP_TX",
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[XDP_REDIRECT] = "XDP_REDIRECT",
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[XDP_UNKNOWN] = "XDP_UNKNOWN",
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};
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static __u64 gettime(void)
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{
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struct timespec t;
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@ -169,6 +183,13 @@ static __u64 gettime(void)
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return (__u64)t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
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}
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static const char *action2str(int action)
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{
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if (action < XDP_ACTION_MAX)
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return xdp_action_names[action];
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return NULL;
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}
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static void sample_print_help(int mask)
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{
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printf("Output format description\n\n"
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@ -206,6 +227,15 @@ static void sample_print_help(int mask)
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printf(" \n\t\t\t\terror/s - Packets that failed redirection per second\n\n");
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}
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if (mask & SAMPLE_EXCEPTION_CNT) {
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printf(" xdp_exception\t\tDisplays xdp_exception tracepoint events\n"
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" \t\t\tThis can occur due to internal driver errors, unrecognized\n"
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" \t\t\tXDP actions and due to explicit user trigger by use of XDP_ABORTED\n"
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" \t\t\tEach action is expanded below this field with its count\n"
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" \t\t\t\thit/s - Number of times the tracepoint was hit per second\n\n");
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}
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}
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void sample_usage(char *argv[], const struct option *long_options,
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@ -327,9 +357,26 @@ static struct stats_record *alloc_stats_record(void)
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}
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}
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}
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if (sample_mask & SAMPLE_EXCEPTION_CNT) {
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for (i = 0; i < XDP_ACTION_MAX; i++) {
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rec->exception[i].cpu = alloc_record_per_cpu();
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if (!rec->exception[i].cpu) {
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fprintf(stderr,
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"Failed to allocate exception per-CPU array for "
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"\"%s\" case\n",
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action2str(i));
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while (i--)
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free(rec->exception[i].cpu);
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goto end_redir;
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}
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}
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}
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return rec;
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end_redir:
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for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++)
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free(rec->redir_err[i].cpu);
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end_rx_cnt:
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free(rec->rx_cnt.cpu);
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end_rec:
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@ -343,6 +390,8 @@ static void free_stats_record(struct stats_record *r)
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struct map_entry *e;
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int i;
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for (i = 0; i < XDP_ACTION_MAX; i++)
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free(r->exception[i].cpu);
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for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++)
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free(r->redir_err[i].cpu);
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free(r->rx_cnt.cpu);
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@ -551,6 +600,50 @@ static void stats_get_redirect_err_cnt(struct stats_record *stats_rec,
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}
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}
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static void stats_get_exception_cnt(struct stats_record *stats_rec,
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struct stats_record *stats_prev,
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unsigned int nr_cpus,
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struct sample_output *out)
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{
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double t, drop, sum = 0;
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struct record *rec, *prev;
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int rec_i, i;
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for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) {
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rec = &stats_rec->exception[rec_i];
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prev = &stats_prev->exception[rec_i];
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t = calc_period(rec, prev);
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drop = calc_drop_pps(&rec->total, &prev->total, t);
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/* Fold out errors after heading */
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sum += drop;
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if (drop > 0 && !out) {
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print_always(" %-18s " FMT_COLUMNf "\n",
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action2str(rec_i), ERR(drop));
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for (i = 0; i < nr_cpus; i++) {
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struct datarec *r = &rec->cpu[i];
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struct datarec *p = &prev->cpu[i];
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char str[64];
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double drop;
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drop = calc_drop_pps(r, p, t);
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if (!drop)
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continue;
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snprintf(str, sizeof(str), "cpu:%d", i);
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print_default(" %-16s" FMT_COLUMNf "\n",
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str, ERR(drop));
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}
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}
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}
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if (out) {
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out->except_cnt.hits = sum;
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out->totals.err += sum;
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}
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}
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static void stats_print(const char *prefix, int mask, struct stats_record *r,
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struct stats_record *p, struct sample_output *out)
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@ -595,6 +688,16 @@ static void stats_print(const char *prefix, int mask, struct stats_record *r,
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stats_get_redirect_err_cnt(r, p, nr_cpus, NULL);
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}
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if (mask & SAMPLE_EXCEPTION_CNT) {
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str = out->except_cnt.hits ? "xdp_exception total" :
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"xdp_exception";
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print_err(out->except_cnt.hits, " %-20s " FMT_COLUMNl "\n", str,
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HITS(out->except_cnt.hits));
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stats_get_exception_cnt(r, p, nr_cpus, NULL);
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}
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if (sample_log_level & LL_DEFAULT ||
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((sample_log_level & LL_SIMPLE) && sample_err_exp)) {
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sample_err_exp = false;
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@ -617,6 +720,9 @@ int sample_setup_maps(struct bpf_map **maps)
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sample_map_count[i] =
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XDP_REDIRECT_ERR_MAX * sample_n_cpus;
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break;
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case MAP_EXCEPTION:
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sample_map_count[i] = XDP_ACTION_MAX * sample_n_cpus;
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break;
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default:
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return -EINVAL;
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}
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@ -788,6 +894,11 @@ static int sample_stats_collect(struct stats_record *rec)
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&rec->redir_err[i]);
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}
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if (sample_mask & SAMPLE_EXCEPTION_CNT)
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for (i = 0; i < XDP_ACTION_MAX; i++)
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map_collect_percpu(&sample_mmap[MAP_EXCEPTION][i * sample_n_cpus],
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&rec->exception[i]);
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return 0;
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}
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@ -811,6 +922,8 @@ static void sample_stats_print(int mask, struct stats_record *cur,
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stats_get_redirect_cnt(cur, prev, 0, &out);
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if (mask & SAMPLE_REDIRECT_ERR_CNT)
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stats_get_redirect_err_cnt(cur, prev, 0, &out);
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if (mask & SAMPLE_EXCEPTION_CNT)
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stats_get_exception_cnt(cur, prev, 0, &out);
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sample_summary_update(&out, interval);
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stats_print(prog_name, mask, cur, prev, &out);
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@ -11,6 +11,7 @@ enum stats_mask {
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_SAMPLE_REDIRECT_MAP = 1U << 0,
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SAMPLE_RX_CNT = 1U << 1,
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SAMPLE_REDIRECT_ERR_CNT = 1U << 2,
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SAMPLE_EXCEPTION_CNT = 1U << 5,
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SAMPLE_REDIRECT_CNT = 1U << 7,
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SAMPLE_REDIRECT_MAP_CNT = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
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SAMPLE_REDIRECT_ERR_MAP_CNT = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
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@ -75,6 +76,8 @@ static inline char *safe_strncpy(char *dst, const char *src, size_t size)
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__attach_tp(tp_xdp_redirect_map_err); \
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if (mask & SAMPLE_REDIRECT_ERR_CNT) \
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__attach_tp(tp_xdp_redirect_err); \
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if (mask & SAMPLE_EXCEPTION_CNT) \
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__attach_tp(tp_xdp_exception); \
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return 0; \
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}
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