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author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2021-08-21 02:19:55 +0200 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2021-08-24 23:48:41 +0200 |
commit | 82c450803a917da6edb34a0a769d0b5a0b10990c (patch) | |
tree | 9c6a9e650c7f6afd3df163152c0d53a642df32a6 /samples | |
parent | samples: bpf: Add BPF support for xdp_exception tracepoint (diff) | |
download | linux-82c450803a917da6edb34a0a769d0b5a0b10990c.tar.xz linux-82c450803a917da6edb34a0a769d0b5a0b10990c.zip |
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
Diffstat (limited to 'samples')
-rw-r--r-- | samples/bpf/xdp_sample_user.c | 113 | ||||
-rw-r--r-- | samples/bpf/xdp_sample_user.h | 3 |
2 files changed, 116 insertions, 0 deletions
diff --git a/samples/bpf/xdp_sample_user.c b/samples/bpf/xdp_sample_user.c index c34592566825..52a30fd1f2a3 100644 --- a/samples/bpf/xdp_sample_user.c +++ b/samples/bpf/xdp_sample_user.c @@ -74,6 +74,7 @@ enum map_type { MAP_RX, MAP_REDIRECT_ERR, + MAP_EXCEPTION, NUM_MAP, }; @@ -98,6 +99,7 @@ struct map_entry { struct stats_record { struct record rx_cnt; struct record redir_err[XDP_REDIRECT_ERR_MAX]; + struct record exception[XDP_ACTION_MAX]; }; struct sample_output { @@ -115,6 +117,9 @@ struct sample_output { __u64 suc; __u64 err; } redir_cnt; + struct { + __u64 hits; + } except_cnt; }; struct xdp_desc { @@ -156,6 +161,15 @@ static const char *xdp_redirect_err_help[XDP_REDIRECT_ERR_MAX - 1] = { "No space in ptr_ring of cpumap kthread", }; +static const char *xdp_action_names[XDP_ACTION_MAX] = { + [XDP_ABORTED] = "XDP_ABORTED", + [XDP_DROP] = "XDP_DROP", + [XDP_PASS] = "XDP_PASS", + [XDP_TX] = "XDP_TX", + [XDP_REDIRECT] = "XDP_REDIRECT", + [XDP_UNKNOWN] = "XDP_UNKNOWN", +}; + static __u64 gettime(void) { struct timespec t; @@ -169,6 +183,13 @@ static __u64 gettime(void) return (__u64)t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec; } +static const char *action2str(int action) +{ + if (action < XDP_ACTION_MAX) + return xdp_action_names[action]; + return NULL; +} + static void sample_print_help(int mask) { printf("Output format description\n\n" @@ -206,6 +227,15 @@ static void sample_print_help(int mask) printf(" \n\t\t\t\terror/s - Packets that failed redirection per second\n\n"); } + + if (mask & SAMPLE_EXCEPTION_CNT) { + printf(" xdp_exception\t\tDisplays xdp_exception tracepoint events\n" + " \t\t\tThis can occur due to internal driver errors, unrecognized\n" + " \t\t\tXDP actions and due to explicit user trigger by use of XDP_ABORTED\n" + " \t\t\tEach action is expanded below this field with its count\n" + " \t\t\t\thit/s - Number of times the tracepoint was hit per second\n\n"); + } + } void sample_usage(char *argv[], const struct option *long_options, @@ -327,9 +357,26 @@ static struct stats_record *alloc_stats_record(void) } } } + if (sample_mask & SAMPLE_EXCEPTION_CNT) { + for (i = 0; i < XDP_ACTION_MAX; i++) { + rec->exception[i].cpu = alloc_record_per_cpu(); + if (!rec->exception[i].cpu) { + fprintf(stderr, + "Failed to allocate exception per-CPU array for " + "\"%s\" case\n", + action2str(i)); + while (i--) + free(rec->exception[i].cpu); + goto end_redir; + } + } + } return rec; +end_redir: + for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++) + free(rec->redir_err[i].cpu); end_rx_cnt: free(rec->rx_cnt.cpu); end_rec: @@ -343,6 +390,8 @@ static void free_stats_record(struct stats_record *r) struct map_entry *e; int i; + for (i = 0; i < XDP_ACTION_MAX; i++) + free(r->exception[i].cpu); for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++) free(r->redir_err[i].cpu); free(r->rx_cnt.cpu); @@ -551,6 +600,50 @@ static void stats_get_redirect_err_cnt(struct stats_record *stats_rec, } } +static void stats_get_exception_cnt(struct stats_record *stats_rec, + struct stats_record *stats_prev, + unsigned int nr_cpus, + struct sample_output *out) +{ + double t, drop, sum = 0; + struct record *rec, *prev; + int rec_i, i; + + for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) { + rec = &stats_rec->exception[rec_i]; + prev = &stats_prev->exception[rec_i]; + t = calc_period(rec, prev); + + drop = calc_drop_pps(&rec->total, &prev->total, t); + /* Fold out errors after heading */ + sum += drop; + + if (drop > 0 && !out) { + print_always(" %-18s " FMT_COLUMNf "\n", + action2str(rec_i), ERR(drop)); + + for (i = 0; i < nr_cpus; i++) { + struct datarec *r = &rec->cpu[i]; + struct datarec *p = &prev->cpu[i]; + char str[64]; + double drop; + + drop = calc_drop_pps(r, p, t); + if (!drop) + continue; + + snprintf(str, sizeof(str), "cpu:%d", i); + print_default(" %-16s" FMT_COLUMNf "\n", + str, ERR(drop)); + } + } + } + + if (out) { + out->except_cnt.hits = sum; + out->totals.err += sum; + } +} static void stats_print(const char *prefix, int mask, struct stats_record *r, struct stats_record *p, struct sample_output *out) @@ -595,6 +688,16 @@ static void stats_print(const char *prefix, int mask, struct stats_record *r, stats_get_redirect_err_cnt(r, p, nr_cpus, NULL); } + if (mask & SAMPLE_EXCEPTION_CNT) { + str = out->except_cnt.hits ? "xdp_exception total" : + "xdp_exception"; + + print_err(out->except_cnt.hits, " %-20s " FMT_COLUMNl "\n", str, + HITS(out->except_cnt.hits)); + + stats_get_exception_cnt(r, p, nr_cpus, NULL); + } + if (sample_log_level & LL_DEFAULT || ((sample_log_level & LL_SIMPLE) && sample_err_exp)) { sample_err_exp = false; @@ -617,6 +720,9 @@ int sample_setup_maps(struct bpf_map **maps) sample_map_count[i] = XDP_REDIRECT_ERR_MAX * sample_n_cpus; break; + case MAP_EXCEPTION: + sample_map_count[i] = XDP_ACTION_MAX * sample_n_cpus; + break; default: return -EINVAL; } @@ -788,6 +894,11 @@ static int sample_stats_collect(struct stats_record *rec) &rec->redir_err[i]); } + if (sample_mask & SAMPLE_EXCEPTION_CNT) + for (i = 0; i < XDP_ACTION_MAX; i++) + map_collect_percpu(&sample_mmap[MAP_EXCEPTION][i * sample_n_cpus], + &rec->exception[i]); + return 0; } @@ -811,6 +922,8 @@ static void sample_stats_print(int mask, struct stats_record *cur, stats_get_redirect_cnt(cur, prev, 0, &out); if (mask & SAMPLE_REDIRECT_ERR_CNT) stats_get_redirect_err_cnt(cur, prev, 0, &out); + if (mask & SAMPLE_EXCEPTION_CNT) + stats_get_exception_cnt(cur, prev, 0, &out); sample_summary_update(&out, interval); stats_print(prog_name, mask, cur, prev, &out); diff --git a/samples/bpf/xdp_sample_user.h b/samples/bpf/xdp_sample_user.h index 1935a0e2f85b..aa28e4bdd628 100644 --- a/samples/bpf/xdp_sample_user.h +++ b/samples/bpf/xdp_sample_user.h @@ -11,6 +11,7 @@ enum stats_mask { _SAMPLE_REDIRECT_MAP = 1U << 0, SAMPLE_RX_CNT = 1U << 1, SAMPLE_REDIRECT_ERR_CNT = 1U << 2, + SAMPLE_EXCEPTION_CNT = 1U << 5, SAMPLE_REDIRECT_CNT = 1U << 7, SAMPLE_REDIRECT_MAP_CNT = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP, SAMPLE_REDIRECT_ERR_MAP_CNT = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP, @@ -75,6 +76,8 @@ static inline char *safe_strncpy(char *dst, const char *src, size_t size) __attach_tp(tp_xdp_redirect_map_err); \ if (mask & SAMPLE_REDIRECT_ERR_CNT) \ __attach_tp(tp_xdp_redirect_err); \ + if (mask & SAMPLE_EXCEPTION_CNT) \ + __attach_tp(tp_xdp_exception); \ return 0; \ } |