ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/samples/bpf/xdp_monitor_user.c b/marvell/linux/samples/bpf/xdp_monitor_user.c
new file mode 100644
index 0000000..ef53b93
--- /dev/null
+++ b/marvell/linux/samples/bpf/xdp_monitor_user.c
@@ -0,0 +1,711 @@
+/* SPDX-License-Identifier: GPL-2.0
+ * Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc.
+ */
+static const char *__doc__=
+ "XDP monitor tool, based on tracepoints\n"
+;
+
+static const char *__doc_err_only__=
+ " NOTICE: Only tracking XDP redirect errors\n"
+ " Enable TX success stats via '--stats'\n"
+ " (which comes with a per packet processing overhead)\n"
+;
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <locale.h>
+
+#include <sys/resource.h>
+#include <getopt.h>
+#include <net/if.h>
+#include <time.h>
+
+#include <bpf/bpf.h>
+#include "bpf_load.h"
+#include "bpf_util.h"
+
+static int verbose = 1;
+static bool debug = false;
+
+static const struct option long_options[] = {
+ {"help", no_argument, NULL, 'h' },
+ {"debug", no_argument, NULL, 'D' },
+ {"stats", no_argument, NULL, 'S' },
+ {"sec", required_argument, NULL, 's' },
+ {0, 0, NULL, 0 }
+};
+
+/* C standard specifies two constants, EXIT_SUCCESS(0) and EXIT_FAILURE(1) */
+#define EXIT_FAIL_MEM 5
+
+static void usage(char *argv[])
+{
+ int i;
+ printf("\nDOCUMENTATION:\n%s\n", __doc__);
+ printf("\n");
+ printf(" Usage: %s (options-see-below)\n",
+ argv[0]);
+ printf(" Listing options:\n");
+ for (i = 0; long_options[i].name != 0; i++) {
+ printf(" --%-15s", long_options[i].name);
+ if (long_options[i].flag != NULL)
+ printf(" flag (internal value:%d)",
+ *long_options[i].flag);
+ else
+ printf("short-option: -%c",
+ long_options[i].val);
+ printf("\n");
+ }
+ printf("\n");
+}
+
+#define NANOSEC_PER_SEC 1000000000 /* 10^9 */
+static __u64 gettime(void)
+{
+ struct timespec t;
+ int res;
+
+ res = clock_gettime(CLOCK_MONOTONIC, &t);
+ if (res < 0) {
+ fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
+ exit(EXIT_FAILURE);
+ }
+ return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
+}
+
+enum {
+ REDIR_SUCCESS = 0,
+ REDIR_ERROR = 1,
+};
+#define REDIR_RES_MAX 2
+static const char *redir_names[REDIR_RES_MAX] = {
+ [REDIR_SUCCESS] = "Success",
+ [REDIR_ERROR] = "Error",
+};
+static const char *err2str(int err)
+{
+ if (err < REDIR_RES_MAX)
+ return redir_names[err];
+ return NULL;
+}
+/* enum xdp_action */
+#define XDP_UNKNOWN XDP_REDIRECT + 1
+#define XDP_ACTION_MAX (XDP_UNKNOWN + 1)
+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 const char *action2str(int action)
+{
+ if (action < XDP_ACTION_MAX)
+ return xdp_action_names[action];
+ return NULL;
+}
+
+/* Common stats data record shared with _kern.c */
+struct datarec {
+ __u64 processed;
+ __u64 dropped;
+ __u64 info;
+ __u64 err;
+};
+#define MAX_CPUS 64
+
+/* Userspace structs for collection of stats from maps */
+struct record {
+ __u64 timestamp;
+ struct datarec total;
+ struct datarec *cpu;
+};
+struct u64rec {
+ __u64 processed;
+};
+struct record_u64 {
+ /* record for _kern side __u64 values */
+ __u64 timestamp;
+ struct u64rec total;
+ struct u64rec *cpu;
+};
+
+struct stats_record {
+ struct record_u64 xdp_redirect[REDIR_RES_MAX];
+ struct record_u64 xdp_exception[XDP_ACTION_MAX];
+ struct record xdp_cpumap_kthread;
+ struct record xdp_cpumap_enqueue[MAX_CPUS];
+ struct record xdp_devmap_xmit;
+};
+
+static bool map_collect_record(int fd, __u32 key, struct record *rec)
+{
+ /* For percpu maps, userspace gets a value per possible CPU */
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ struct datarec values[nr_cpus];
+ __u64 sum_processed = 0;
+ __u64 sum_dropped = 0;
+ __u64 sum_info = 0;
+ __u64 sum_err = 0;
+ int i;
+
+ if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
+ fprintf(stderr,
+ "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
+ return false;
+ }
+ /* Get time as close as possible to reading map contents */
+ rec->timestamp = gettime();
+
+ /* Record and sum values from each CPU */
+ for (i = 0; i < nr_cpus; i++) {
+ rec->cpu[i].processed = values[i].processed;
+ sum_processed += values[i].processed;
+ rec->cpu[i].dropped = values[i].dropped;
+ sum_dropped += values[i].dropped;
+ rec->cpu[i].info = values[i].info;
+ sum_info += values[i].info;
+ rec->cpu[i].err = values[i].err;
+ sum_err += values[i].err;
+ }
+ rec->total.processed = sum_processed;
+ rec->total.dropped = sum_dropped;
+ rec->total.info = sum_info;
+ rec->total.err = sum_err;
+ return true;
+}
+
+static bool map_collect_record_u64(int fd, __u32 key, struct record_u64 *rec)
+{
+ /* For percpu maps, userspace gets a value per possible CPU */
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ struct u64rec values[nr_cpus];
+ __u64 sum_total = 0;
+ int i;
+
+ if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
+ fprintf(stderr,
+ "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
+ return false;
+ }
+ /* Get time as close as possible to reading map contents */
+ rec->timestamp = gettime();
+
+ /* Record and sum values from each CPU */
+ for (i = 0; i < nr_cpus; i++) {
+ rec->cpu[i].processed = values[i].processed;
+ sum_total += values[i].processed;
+ }
+ rec->total.processed = sum_total;
+ return true;
+}
+
+static double calc_period(struct record *r, struct record *p)
+{
+ double period_ = 0;
+ __u64 period = 0;
+
+ period = r->timestamp - p->timestamp;
+ if (period > 0)
+ period_ = ((double) period / NANOSEC_PER_SEC);
+
+ return period_;
+}
+
+static double calc_period_u64(struct record_u64 *r, struct record_u64 *p)
+{
+ double period_ = 0;
+ __u64 period = 0;
+
+ period = r->timestamp - p->timestamp;
+ if (period > 0)
+ period_ = ((double) period / NANOSEC_PER_SEC);
+
+ return period_;
+}
+
+static double calc_pps(struct datarec *r, struct datarec *p, double period)
+{
+ __u64 packets = 0;
+ double pps = 0;
+
+ if (period > 0) {
+ packets = r->processed - p->processed;
+ pps = packets / period;
+ }
+ return pps;
+}
+
+static double calc_pps_u64(struct u64rec *r, struct u64rec *p, double period)
+{
+ __u64 packets = 0;
+ double pps = 0;
+
+ if (period > 0) {
+ packets = r->processed - p->processed;
+ pps = packets / period;
+ }
+ return pps;
+}
+
+static double calc_drop(struct datarec *r, struct datarec *p, double period)
+{
+ __u64 packets = 0;
+ double pps = 0;
+
+ if (period > 0) {
+ packets = r->dropped - p->dropped;
+ pps = packets / period;
+ }
+ return pps;
+}
+
+static double calc_info(struct datarec *r, struct datarec *p, double period)
+{
+ __u64 packets = 0;
+ double pps = 0;
+
+ if (period > 0) {
+ packets = r->info - p->info;
+ pps = packets / period;
+ }
+ return pps;
+}
+
+static double calc_err(struct datarec *r, struct datarec *p, double period)
+{
+ __u64 packets = 0;
+ double pps = 0;
+
+ if (period > 0) {
+ packets = r->err - p->err;
+ pps = packets / period;
+ }
+ return pps;
+}
+
+static void stats_print(struct stats_record *stats_rec,
+ struct stats_record *stats_prev,
+ bool err_only)
+{
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ int rec_i = 0, i, to_cpu;
+ double t = 0, pps = 0;
+
+ /* Header */
+ printf("%-15s %-7s %-12s %-12s %-9s\n",
+ "XDP-event", "CPU:to", "pps", "drop-pps", "extra-info");
+
+ /* tracepoint: xdp:xdp_redirect_* */
+ if (err_only)
+ rec_i = REDIR_ERROR;
+
+ for (; rec_i < REDIR_RES_MAX; rec_i++) {
+ struct record_u64 *rec, *prev;
+ char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n";
+ char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n";
+
+ rec = &stats_rec->xdp_redirect[rec_i];
+ prev = &stats_prev->xdp_redirect[rec_i];
+ t = calc_period_u64(rec, prev);
+
+ for (i = 0; i < nr_cpus; i++) {
+ struct u64rec *r = &rec->cpu[i];
+ struct u64rec *p = &prev->cpu[i];
+
+ pps = calc_pps_u64(r, p, t);
+ if (pps > 0)
+ printf(fmt1, "XDP_REDIRECT", i,
+ rec_i ? 0.0: pps, rec_i ? pps : 0.0,
+ err2str(rec_i));
+ }
+ pps = calc_pps_u64(&rec->total, &prev->total, t);
+ printf(fmt2, "XDP_REDIRECT", "total",
+ rec_i ? 0.0: pps, rec_i ? pps : 0.0, err2str(rec_i));
+ }
+
+ /* tracepoint: xdp:xdp_exception */
+ for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) {
+ struct record_u64 *rec, *prev;
+ char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n";
+ char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n";
+
+ rec = &stats_rec->xdp_exception[rec_i];
+ prev = &stats_prev->xdp_exception[rec_i];
+ t = calc_period_u64(rec, prev);
+
+ for (i = 0; i < nr_cpus; i++) {
+ struct u64rec *r = &rec->cpu[i];
+ struct u64rec *p = &prev->cpu[i];
+
+ pps = calc_pps_u64(r, p, t);
+ if (pps > 0)
+ printf(fmt1, "Exception", i,
+ 0.0, pps, action2str(rec_i));
+ }
+ pps = calc_pps_u64(&rec->total, &prev->total, t);
+ if (pps > 0)
+ printf(fmt2, "Exception", "total",
+ 0.0, pps, action2str(rec_i));
+ }
+
+ /* cpumap enqueue stats */
+ for (to_cpu = 0; to_cpu < MAX_CPUS; to_cpu++) {
+ char *fmt1 = "%-15s %3d:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n";
+ char *fmt2 = "%-15s %3s:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n";
+ struct record *rec, *prev;
+ char *info_str = "";
+ double drop, info;
+
+ rec = &stats_rec->xdp_cpumap_enqueue[to_cpu];
+ prev = &stats_prev->xdp_cpumap_enqueue[to_cpu];
+ t = calc_period(rec, prev);
+ for (i = 0; i < nr_cpus; i++) {
+ struct datarec *r = &rec->cpu[i];
+ struct datarec *p = &prev->cpu[i];
+
+ pps = calc_pps(r, p, t);
+ drop = calc_drop(r, p, t);
+ info = calc_info(r, p, t);
+ if (info > 0) {
+ info_str = "bulk-average";
+ info = pps / info; /* calc average bulk size */
+ }
+ if (pps > 0)
+ printf(fmt1, "cpumap-enqueue",
+ i, to_cpu, pps, drop, info, info_str);
+ }
+ pps = calc_pps(&rec->total, &prev->total, t);
+ if (pps > 0) {
+ drop = calc_drop(&rec->total, &prev->total, t);
+ info = calc_info(&rec->total, &prev->total, t);
+ if (info > 0) {
+ info_str = "bulk-average";
+ info = pps / info; /* calc average bulk size */
+ }
+ printf(fmt2, "cpumap-enqueue",
+ "sum", to_cpu, pps, drop, info, info_str);
+ }
+ }
+
+ /* cpumap kthread stats */
+ {
+ char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %'-10.0f %s\n";
+ char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %'-10.0f %s\n";
+ struct record *rec, *prev;
+ double drop, info;
+ char *i_str = "";
+
+ rec = &stats_rec->xdp_cpumap_kthread;
+ prev = &stats_prev->xdp_cpumap_kthread;
+ t = calc_period(rec, prev);
+ for (i = 0; i < nr_cpus; i++) {
+ struct datarec *r = &rec->cpu[i];
+ struct datarec *p = &prev->cpu[i];
+
+ pps = calc_pps(r, p, t);
+ drop = calc_drop(r, p, t);
+ info = calc_info(r, p, t);
+ if (info > 0)
+ i_str = "sched";
+ if (pps > 0 || drop > 0)
+ printf(fmt1, "cpumap-kthread",
+ i, pps, drop, info, i_str);
+ }
+ pps = calc_pps(&rec->total, &prev->total, t);
+ drop = calc_drop(&rec->total, &prev->total, t);
+ info = calc_info(&rec->total, &prev->total, t);
+ if (info > 0)
+ i_str = "sched-sum";
+ printf(fmt2, "cpumap-kthread", "total", pps, drop, info, i_str);
+ }
+
+ /* devmap ndo_xdp_xmit stats */
+ {
+ char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %'-10.2f %s %s\n";
+ char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %'-10.2f %s %s\n";
+ struct record *rec, *prev;
+ double drop, info, err;
+ char *i_str = "";
+ char *err_str = "";
+
+ rec = &stats_rec->xdp_devmap_xmit;
+ prev = &stats_prev->xdp_devmap_xmit;
+ t = calc_period(rec, prev);
+ for (i = 0; i < nr_cpus; i++) {
+ struct datarec *r = &rec->cpu[i];
+ struct datarec *p = &prev->cpu[i];
+
+ pps = calc_pps(r, p, t);
+ drop = calc_drop(r, p, t);
+ info = calc_info(r, p, t);
+ err = calc_err(r, p, t);
+ if (info > 0) {
+ i_str = "bulk-average";
+ info = (pps+drop) / info; /* calc avg bulk */
+ }
+ if (err > 0)
+ err_str = "drv-err";
+ if (pps > 0 || drop > 0)
+ printf(fmt1, "devmap-xmit",
+ i, pps, drop, info, i_str, err_str);
+ }
+ pps = calc_pps(&rec->total, &prev->total, t);
+ drop = calc_drop(&rec->total, &prev->total, t);
+ info = calc_info(&rec->total, &prev->total, t);
+ err = calc_err(&rec->total, &prev->total, t);
+ if (info > 0) {
+ i_str = "bulk-average";
+ info = (pps+drop) / info; /* calc avg bulk */
+ }
+ if (err > 0)
+ err_str = "drv-err";
+ printf(fmt2, "devmap-xmit", "total", pps, drop,
+ info, i_str, err_str);
+ }
+
+ printf("\n");
+}
+
+static bool stats_collect(struct stats_record *rec)
+{
+ int fd;
+ int i;
+
+ /* TODO: Detect if someone unloaded the perf event_fd's, as
+ * this can happen by someone running perf-record -e
+ */
+
+ fd = map_data[0].fd; /* map0: redirect_err_cnt */
+ for (i = 0; i < REDIR_RES_MAX; i++)
+ map_collect_record_u64(fd, i, &rec->xdp_redirect[i]);
+
+ fd = map_data[1].fd; /* map1: exception_cnt */
+ for (i = 0; i < XDP_ACTION_MAX; i++) {
+ map_collect_record_u64(fd, i, &rec->xdp_exception[i]);
+ }
+
+ fd = map_data[2].fd; /* map2: cpumap_enqueue_cnt */
+ for (i = 0; i < MAX_CPUS; i++)
+ map_collect_record(fd, i, &rec->xdp_cpumap_enqueue[i]);
+
+ fd = map_data[3].fd; /* map3: cpumap_kthread_cnt */
+ map_collect_record(fd, 0, &rec->xdp_cpumap_kthread);
+
+ fd = map_data[4].fd; /* map4: devmap_xmit_cnt */
+ map_collect_record(fd, 0, &rec->xdp_devmap_xmit);
+
+ return true;
+}
+
+static void *alloc_rec_per_cpu(int record_size)
+{
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ void *array;
+
+ array = calloc(nr_cpus, record_size);
+ if (!array) {
+ fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
+ exit(EXIT_FAIL_MEM);
+ }
+ return array;
+}
+
+static struct stats_record *alloc_stats_record(void)
+{
+ struct stats_record *rec;
+ int rec_sz;
+ int i;
+
+ /* Alloc main stats_record structure */
+ rec = calloc(1, sizeof(*rec));
+ if (!rec) {
+ fprintf(stderr, "Mem alloc error\n");
+ exit(EXIT_FAIL_MEM);
+ }
+
+ /* Alloc stats stored per CPU for each record */
+ rec_sz = sizeof(struct u64rec);
+ for (i = 0; i < REDIR_RES_MAX; i++)
+ rec->xdp_redirect[i].cpu = alloc_rec_per_cpu(rec_sz);
+
+ for (i = 0; i < XDP_ACTION_MAX; i++)
+ rec->xdp_exception[i].cpu = alloc_rec_per_cpu(rec_sz);
+
+ rec_sz = sizeof(struct datarec);
+ rec->xdp_cpumap_kthread.cpu = alloc_rec_per_cpu(rec_sz);
+ rec->xdp_devmap_xmit.cpu = alloc_rec_per_cpu(rec_sz);
+
+ for (i = 0; i < MAX_CPUS; i++)
+ rec->xdp_cpumap_enqueue[i].cpu = alloc_rec_per_cpu(rec_sz);
+
+ return rec;
+}
+
+static void free_stats_record(struct stats_record *r)
+{
+ int i;
+
+ for (i = 0; i < REDIR_RES_MAX; i++)
+ free(r->xdp_redirect[i].cpu);
+
+ for (i = 0; i < XDP_ACTION_MAX; i++)
+ free(r->xdp_exception[i].cpu);
+
+ free(r->xdp_cpumap_kthread.cpu);
+ free(r->xdp_devmap_xmit.cpu);
+
+ for (i = 0; i < MAX_CPUS; i++)
+ free(r->xdp_cpumap_enqueue[i].cpu);
+
+ free(r);
+}
+
+/* Pointer swap trick */
+static inline void swap(struct stats_record **a, struct stats_record **b)
+{
+ struct stats_record *tmp;
+
+ tmp = *a;
+ *a = *b;
+ *b = tmp;
+}
+
+static void stats_poll(int interval, bool err_only)
+{
+ struct stats_record *rec, *prev;
+
+ rec = alloc_stats_record();
+ prev = alloc_stats_record();
+ stats_collect(rec);
+
+ if (err_only)
+ printf("\n%s\n", __doc_err_only__);
+
+ /* Trick to pretty printf with thousands separators use %' */
+ setlocale(LC_NUMERIC, "en_US");
+
+ /* Header */
+ if (verbose)
+ printf("\n%s", __doc__);
+
+ /* TODO Need more advanced stats on error types */
+ if (verbose) {
+ printf(" - Stats map0: %s\n", map_data[0].name);
+ printf(" - Stats map1: %s\n", map_data[1].name);
+ printf("\n");
+ }
+ fflush(stdout);
+
+ while (1) {
+ swap(&prev, &rec);
+ stats_collect(rec);
+ stats_print(rec, prev, err_only);
+ fflush(stdout);
+ sleep(interval);
+ }
+
+ free_stats_record(rec);
+ free_stats_record(prev);
+}
+
+static void print_bpf_prog_info(void)
+{
+ int i;
+
+ /* Prog info */
+ printf("Loaded BPF prog have %d bpf program(s)\n", prog_cnt);
+ for (i = 0; i < prog_cnt; i++) {
+ printf(" - prog_fd[%d] = fd(%d)\n", i, prog_fd[i]);
+ }
+
+ /* Maps info */
+ printf("Loaded BPF prog have %d map(s)\n", map_data_count);
+ for (i = 0; i < map_data_count; i++) {
+ char *name = map_data[i].name;
+ int fd = map_data[i].fd;
+
+ printf(" - map_data[%d] = fd(%d) name:%s\n", i, fd, name);
+ }
+
+ /* Event info */
+ printf("Searching for (max:%d) event file descriptor(s)\n", prog_cnt);
+ for (i = 0; i < prog_cnt; i++) {
+ if (event_fd[i] != -1)
+ printf(" - event_fd[%d] = fd(%d)\n", i, event_fd[i]);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ int longindex = 0, opt;
+ int ret = EXIT_SUCCESS;
+ char bpf_obj_file[256];
+
+ /* Default settings: */
+ bool errors_only = true;
+ int interval = 2;
+
+ snprintf(bpf_obj_file, sizeof(bpf_obj_file), "%s_kern.o", argv[0]);
+
+ /* Parse commands line args */
+ while ((opt = getopt_long(argc, argv, "hDSs:",
+ long_options, &longindex)) != -1) {
+ switch (opt) {
+ case 'D':
+ debug = true;
+ break;
+ case 'S':
+ errors_only = false;
+ break;
+ case 's':
+ interval = atoi(optarg);
+ break;
+ case 'h':
+ default:
+ usage(argv);
+ return EXIT_FAILURE;
+ }
+ }
+
+ if (setrlimit(RLIMIT_MEMLOCK, &r)) {
+ perror("setrlimit(RLIMIT_MEMLOCK)");
+ return EXIT_FAILURE;
+ }
+
+ if (load_bpf_file(bpf_obj_file)) {
+ printf("ERROR - bpf_log_buf: %s", bpf_log_buf);
+ return EXIT_FAILURE;
+ }
+ if (!prog_fd[0]) {
+ printf("ERROR - load_bpf_file: %s\n", strerror(errno));
+ return EXIT_FAILURE;
+ }
+
+ if (debug) {
+ print_bpf_prog_info();
+ }
+
+ /* Unload/stop tracepoint event by closing fd's */
+ if (errors_only) {
+ /* The prog_fd[i] and event_fd[i] depend on the
+ * order the functions was defined in _kern.c
+ */
+ close(event_fd[2]); /* tracepoint/xdp/xdp_redirect */
+ close(prog_fd[2]); /* func: trace_xdp_redirect */
+ close(event_fd[3]); /* tracepoint/xdp/xdp_redirect_map */
+ close(prog_fd[3]); /* func: trace_xdp_redirect_map */
+ }
+
+ stats_poll(interval, errors_only);
+
+ return ret;
+}