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linuxdebug/samples/bpf/xdp_sample_user.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/ethtool.h>
#include <linux/hashtable.h>
#include <linux/if_link.h>
#include <linux/jhash.h>
#include <linux/limits.h>
#include <linux/list.h>
#include <linux/sockios.h>
#include <locale.h>
#include <math.h>
#include <net/if.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/signalfd.h>
#include <sys/sysinfo.h>
#include <sys/timerfd.h>
#include <sys/utsname.h>
#include <time.h>
#include <unistd.h>
#include "bpf_util.h"
#include "xdp_sample_user.h"
#define __sample_print(fmt, cond, ...) \
({ \
if (cond) \
printf(fmt, ##__VA_ARGS__); \
})
#define print_always(fmt, ...) __sample_print(fmt, 1, ##__VA_ARGS__)
#define print_default(fmt, ...) \
__sample_print(fmt, sample_log_level & LL_DEFAULT, ##__VA_ARGS__)
#define __print_err(err, fmt, ...) \
({ \
__sample_print(fmt, err > 0 || sample_log_level & LL_DEFAULT, \
##__VA_ARGS__); \
sample_err_exp = sample_err_exp ? true : err > 0; \
})
#define print_err(err, fmt, ...) __print_err(err, fmt, ##__VA_ARGS__)
#define __COLUMN(x) "%'10" x " %-13s"
#define FMT_COLUMNf __COLUMN(".0f")
#define FMT_COLUMNd __COLUMN("d")
#define FMT_COLUMNl __COLUMN("llu")
#define RX(rx) rx, "rx/s"
#define PPS(pps) pps, "pkt/s"
#define DROP(drop) drop, "drop/s"
#define ERR(err) err, "error/s"
#define HITS(hits) hits, "hit/s"
#define XMIT(xmit) xmit, "xmit/s"
#define PASS(pass) pass, "pass/s"
#define REDIR(redir) redir, "redir/s"
#define NANOSEC_PER_SEC 1000000000 /* 10^9 */
#define XDP_UNKNOWN (XDP_REDIRECT + 1)
#define XDP_ACTION_MAX (XDP_UNKNOWN + 1)
#define XDP_REDIRECT_ERR_MAX 7
enum map_type {
MAP_RX,
MAP_REDIRECT_ERR,
MAP_CPUMAP_ENQUEUE,
MAP_CPUMAP_KTHREAD,
MAP_EXCEPTION,
MAP_DEVMAP_XMIT,
MAP_DEVMAP_XMIT_MULTI,
NUM_MAP,
};
enum log_level {
LL_DEFAULT = 1U << 0,
LL_SIMPLE = 1U << 1,
LL_DEBUG = 1U << 2,
};
struct record {
__u64 timestamp;
struct datarec total;
struct datarec *cpu;
};
struct map_entry {
struct hlist_node node;
__u64 pair;
struct record val;
};
struct stats_record {
struct record rx_cnt;
struct record redir_err[XDP_REDIRECT_ERR_MAX];
struct record kthread;
struct record exception[XDP_ACTION_MAX];
struct record devmap_xmit;
DECLARE_HASHTABLE(xmit_map, 5);
struct record enq[];
};
struct sample_output {
struct {
__u64 rx;
__u64 redir;
__u64 drop;
__u64 drop_xmit;
__u64 err;
__u64 xmit;
} totals;
struct {
union {
__u64 pps;
__u64 num;
};
__u64 drop;
__u64 err;
} rx_cnt;
struct {
__u64 suc;
__u64 err;
} redir_cnt;
struct {
__u64 hits;
} except_cnt;
struct {
__u64 pps;
__u64 drop;
__u64 err;
double bavg;
} xmit_cnt;
};
struct xdp_desc {
int ifindex;
__u32 prog_id;
int flags;
} sample_xdp_progs[32];
struct datarec *sample_mmap[NUM_MAP];
struct bpf_map *sample_map[NUM_MAP];
size_t sample_map_count[NUM_MAP];
enum log_level sample_log_level;
struct sample_output sample_out;
unsigned long sample_interval;
bool sample_err_exp;
int sample_xdp_cnt;
int sample_n_cpus;
int sample_sig_fd;
int sample_mask;
static const char *xdp_redirect_err_names[XDP_REDIRECT_ERR_MAX] = {
/* Key=1 keeps unknown errors */
"Success",
"Unknown",
"EINVAL",
"ENETDOWN",
"EMSGSIZE",
"EOPNOTSUPP",
"ENOSPC",
};
/* Keyed from Unknown */
static const char *xdp_redirect_err_help[XDP_REDIRECT_ERR_MAX - 1] = {
"Unknown error",
"Invalid redirection",
"Device being redirected to is down",
"Packet length too large for device",
"Operation not supported",
"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;
int res;
res = clock_gettime(CLOCK_MONOTONIC, &t);
if (res < 0) {
fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
return UINT64_MAX;
}
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"
"By default, redirect success statistics are disabled, use -s to enable.\n"
"The terse output mode is default, verbose mode can be activated using -v\n"
"Use SIGQUIT (Ctrl + \\) to switch the mode dynamically at runtime\n\n"
"Terse mode displays at most the following fields:\n"
" rx/s Number of packets received per second\n"
" redir/s Number of packets successfully redirected per second\n"
" err,drop/s Aggregated count of errors per second (including dropped packets)\n"
" xmit/s Number of packets transmitted on the output device per second\n\n"
"Output description for verbose mode:\n"
" FIELD DESCRIPTION\n");
if (mask & SAMPLE_RX_CNT) {
printf(" receive\t\tDisplays the number of packets received & errors encountered\n"
" \t\t\tWhenever an error or packet drop occurs, details of per CPU error\n"
" \t\t\tand drop statistics will be expanded inline in terse mode.\n"
" \t\t\t\tpkt/s - Packets received per second\n"
" \t\t\t\tdrop/s - Packets dropped per second\n"
" \t\t\t\terror/s - Errors encountered per second\n\n");
}
if (mask & (SAMPLE_REDIRECT_CNT | SAMPLE_REDIRECT_ERR_CNT)) {
printf(" redirect\t\tDisplays the number of packets successfully redirected\n"
" \t\t\tErrors encountered are expanded under redirect_err field\n"
" \t\t\tNote that passing -s to enable it has a per packet overhead\n"
" \t\t\t\tredir/s - Packets redirected successfully per second\n\n"
" redirect_err\t\tDisplays the number of packets that failed redirection\n"
" \t\t\tThe errno is expanded under this field with per CPU count\n"
" \t\t\tThe recognized errors are:\n");
for (int i = 2; i < XDP_REDIRECT_ERR_MAX; i++)
printf("\t\t\t %s: %s\n", xdp_redirect_err_names[i],
xdp_redirect_err_help[i - 1]);
printf(" \n\t\t\t\terror/s - Packets that failed redirection per second\n\n");
}
if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT) {
printf(" enqueue to cpu N\tDisplays the number of packets enqueued to bulk queue of CPU N\n"
" \t\t\tExpands to cpu:FROM->N to display enqueue stats for each CPU enqueuing to CPU N\n"
" \t\t\tReceived packets can be associated with the CPU redirect program is enqueuing \n"
" \t\t\tpackets to.\n"
" \t\t\t\tpkt/s - Packets enqueued per second from other CPU to CPU N\n"
" \t\t\t\tdrop/s - Packets dropped when trying to enqueue to CPU N\n"
" \t\t\t\tbulk-avg - Average number of packets processed for each event\n\n");
}
if (mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
printf(" kthread\t\tDisplays the number of packets processed in CPUMAP kthread for each CPU\n"
" \t\t\tPackets consumed from ptr_ring in kthread, and its xdp_stats (after calling \n"
" \t\t\tCPUMAP bpf prog) are expanded below this. xdp_stats are expanded as a total and\n"
" \t\t\tthen per-CPU to associate it to each CPU's pinned CPUMAP kthread.\n"
" \t\t\t\tpkt/s - Packets consumed per second from ptr_ring\n"
" \t\t\t\tdrop/s - Packets dropped per second in kthread\n"
" \t\t\t\tsched - Number of times kthread called schedule()\n\n"
" \t\t\txdp_stats (also expands to per-CPU counts)\n"
" \t\t\t\tpass/s - XDP_PASS count for CPUMAP program execution\n"
" \t\t\t\tdrop/s - XDP_DROP count for CPUMAP program execution\n"
" \t\t\t\tredir/s - XDP_REDIRECT count for CPUMAP program execution\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");
}
if (mask & SAMPLE_DEVMAP_XMIT_CNT) {
printf(" devmap_xmit\t\tDisplays devmap_xmit tracepoint events\n"
" \t\t\tThis tracepoint is invoked for successful transmissions on output\n"
" \t\t\tdevice but these statistics are not available for generic XDP mode,\n"
" \t\t\thence they will be omitted from the output when using SKB mode\n"
" \t\t\t\txmit/s - Number of packets that were transmitted per second\n"
" \t\t\t\tdrop/s - Number of packets that failed transmissions per second\n"
" \t\t\t\tdrv_err/s - Number of internal driver errors per second\n"
" \t\t\t\tbulk-avg - Average number of packets processed for each event\n\n");
}
}
void sample_usage(char *argv[], const struct option *long_options,
const char *doc, int mask, bool error)
{
int i;
if (!error)
sample_print_help(mask);
printf("\n%s\nOption for %s:\n", doc, argv[0]);
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("\t short-option: -%c", long_options[i].val);
printf("\n");
}
printf("\n");
}
static struct datarec *alloc_record_per_cpu(void)
{
unsigned int nr_cpus = libbpf_num_possible_cpus();
struct datarec *array;
array = calloc(nr_cpus, sizeof(*array));
if (!array) {
fprintf(stderr, "Failed to allocate memory (nr_cpus: %u)\n",
nr_cpus);
return NULL;
}
return array;
}
static int map_entry_init(struct map_entry *e, __u64 pair)
{
e->pair = pair;
INIT_HLIST_NODE(&e->node);
e->val.timestamp = gettime();
e->val.cpu = alloc_record_per_cpu();
if (!e->val.cpu)
return -ENOMEM;
return 0;
}
static void map_collect_percpu(struct datarec *values, struct record *rec)
{
/* For percpu maps, userspace gets a value per possible CPU */
unsigned int nr_cpus = libbpf_num_possible_cpus();
__u64 sum_xdp_redirect = 0;
__u64 sum_processed = 0;
__u64 sum_xdp_pass = 0;
__u64 sum_xdp_drop = 0;
__u64 sum_dropped = 0;
__u64 sum_issue = 0;
int i;
/* 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 = READ_ONCE(values[i].processed);
rec->cpu[i].dropped = READ_ONCE(values[i].dropped);
rec->cpu[i].issue = READ_ONCE(values[i].issue);
rec->cpu[i].xdp_pass = READ_ONCE(values[i].xdp_pass);
rec->cpu[i].xdp_drop = READ_ONCE(values[i].xdp_drop);
rec->cpu[i].xdp_redirect = READ_ONCE(values[i].xdp_redirect);
sum_processed += rec->cpu[i].processed;
sum_dropped += rec->cpu[i].dropped;
sum_issue += rec->cpu[i].issue;
sum_xdp_pass += rec->cpu[i].xdp_pass;
sum_xdp_drop += rec->cpu[i].xdp_drop;
sum_xdp_redirect += rec->cpu[i].xdp_redirect;
}
rec->total.processed = sum_processed;
rec->total.dropped = sum_dropped;
rec->total.issue = sum_issue;
rec->total.xdp_pass = sum_xdp_pass;
rec->total.xdp_drop = sum_xdp_drop;
rec->total.xdp_redirect = sum_xdp_redirect;
}
static int map_collect_percpu_devmap(int map_fd, struct stats_record *rec)
{
unsigned int nr_cpus = bpf_num_possible_cpus();
__u32 batch, count = 32;
struct datarec *values;
bool init = false;
__u64 *keys;
int i, ret;
keys = calloc(count, sizeof(__u64));
if (!keys)
return -ENOMEM;
values = calloc(count * nr_cpus, sizeof(struct datarec));
if (!values) {
free(keys);
return -ENOMEM;
}
for (;;) {
bool exit = false;
ret = bpf_map_lookup_batch(map_fd, init ? &batch : NULL, &batch,
keys, values, &count, NULL);
if (ret < 0 && errno != ENOENT)
break;
if (errno == ENOENT)
exit = true;
init = true;
for (i = 0; i < count; i++) {
struct map_entry *e, *x = NULL;
__u64 pair = keys[i];
struct datarec *arr;
arr = &values[i * nr_cpus];
hash_for_each_possible(rec->xmit_map, e, node, pair) {
if (e->pair == pair) {
x = e;
break;
}
}
if (!x) {
x = calloc(1, sizeof(*x));
if (!x)
goto cleanup;
if (map_entry_init(x, pair) < 0) {
free(x);
goto cleanup;
}
hash_add(rec->xmit_map, &x->node, pair);
}
map_collect_percpu(arr, &x->val);
}
if (exit)
break;
count = 32;
}
free(values);
free(keys);
return 0;
cleanup:
free(values);
free(keys);
return -ENOMEM;
}
static struct stats_record *alloc_stats_record(void)
{
struct stats_record *rec;
int i;
rec = calloc(1, sizeof(*rec) + sample_n_cpus * sizeof(struct record));
if (!rec) {
fprintf(stderr, "Failed to allocate memory\n");
return NULL;
}
if (sample_mask & SAMPLE_RX_CNT) {
rec->rx_cnt.cpu = alloc_record_per_cpu();
if (!rec->rx_cnt.cpu) {
fprintf(stderr,
"Failed to allocate rx_cnt per-CPU array\n");
goto end_rec;
}
}
if (sample_mask & (SAMPLE_REDIRECT_CNT | SAMPLE_REDIRECT_ERR_CNT)) {
for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++) {
rec->redir_err[i].cpu = alloc_record_per_cpu();
if (!rec->redir_err[i].cpu) {
fprintf(stderr,
"Failed to allocate redir_err per-CPU array for "
"\"%s\" case\n",
xdp_redirect_err_names[i]);
while (i--)
free(rec->redir_err[i].cpu);
goto end_rx_cnt;
}
}
}
if (sample_mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
rec->kthread.cpu = alloc_record_per_cpu();
if (!rec->kthread.cpu) {
fprintf(stderr,
"Failed to allocate kthread per-CPU array\n");
goto end_redir;
}
}
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_kthread;
}
}
}
if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT) {
rec->devmap_xmit.cpu = alloc_record_per_cpu();
if (!rec->devmap_xmit.cpu) {
fprintf(stderr,
"Failed to allocate devmap_xmit per-CPU array\n");
goto end_exception;
}
}
if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
hash_init(rec->xmit_map);
if (sample_mask & SAMPLE_CPUMAP_ENQUEUE_CNT) {
for (i = 0; i < sample_n_cpus; i++) {
rec->enq[i].cpu = alloc_record_per_cpu();
if (!rec->enq[i].cpu) {
fprintf(stderr,
"Failed to allocate enqueue per-CPU array for "
"CPU %d\n",
i);
while (i--)
free(rec->enq[i].cpu);
goto end_devmap_xmit;
}
}
}
return rec;
end_devmap_xmit:
free(rec->devmap_xmit.cpu);
end_exception:
for (i = 0; i < XDP_ACTION_MAX; i++)
free(rec->exception[i].cpu);
end_kthread:
free(rec->kthread.cpu);
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:
free(rec);
return NULL;
}
static void free_stats_record(struct stats_record *r)
{
struct hlist_node *tmp;
struct map_entry *e;
int i;
for (i = 0; i < sample_n_cpus; i++)
free(r->enq[i].cpu);
hash_for_each_safe(r->xmit_map, i, tmp, e, node) {
hash_del(&e->node);
free(e->val.cpu);
free(e);
}
free(r->devmap_xmit.cpu);
for (i = 0; i < XDP_ACTION_MAX; i++)
free(r->exception[i].cpu);
free(r->kthread.cpu);
for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++)
free(r->redir_err[i].cpu);
free(r->rx_cnt.cpu);
free(r);
}
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 sample_round(double val)
{
if (val - floor(val) < 0.5)
return floor(val);
return ceil(val);
}
static __u64 calc_pps(struct datarec *r, struct datarec *p, double period_)
{
__u64 packets = 0;
__u64 pps = 0;
if (period_ > 0) {
packets = r->processed - p->processed;
pps = sample_round(packets / period_);
}
return pps;
}
static __u64 calc_drop_pps(struct datarec *r, struct datarec *p, double period_)
{
__u64 packets = 0;
__u64 pps = 0;
if (period_ > 0) {
packets = r->dropped - p->dropped;
pps = sample_round(packets / period_);
}
return pps;
}
static __u64 calc_errs_pps(struct datarec *r, struct datarec *p, double period_)
{
__u64 packets = 0;
__u64 pps = 0;
if (period_ > 0) {
packets = r->issue - p->issue;
pps = sample_round(packets / period_);
}
return pps;
}
static __u64 calc_info_pps(struct datarec *r, struct datarec *p, double period_)
{
__u64 packets = 0;
__u64 pps = 0;
if (period_ > 0) {
packets = r->info - p->info;
pps = sample_round(packets / period_);
}
return pps;
}
static void calc_xdp_pps(struct datarec *r, struct datarec *p, double *xdp_pass,
double *xdp_drop, double *xdp_redirect, double period_)
{
*xdp_pass = 0, *xdp_drop = 0, *xdp_redirect = 0;
if (period_ > 0) {
*xdp_redirect = (r->xdp_redirect - p->xdp_redirect) / period_;
*xdp_pass = (r->xdp_pass - p->xdp_pass) / period_;
*xdp_drop = (r->xdp_drop - p->xdp_drop) / period_;
}
}
static void stats_get_rx_cnt(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus, struct sample_output *out)
{
struct record *rec, *prev;
double t, pps, drop, err;
int i;
rec = &stats_rec->rx_cnt;
prev = &stats_prev->rx_cnt;
t = calc_period(rec, prev);
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
char str[64];
pps = calc_pps(r, p, t);
drop = calc_drop_pps(r, p, t);
err = calc_errs_pps(r, p, t);
if (!pps && !drop && !err)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
print_default(" %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
"\n",
str, PPS(pps), DROP(drop), ERR(err));
}
if (out) {
pps = calc_pps(&rec->total, &prev->total, t);
drop = calc_drop_pps(&rec->total, &prev->total, t);
err = calc_errs_pps(&rec->total, &prev->total, t);
out->rx_cnt.pps = pps;
out->rx_cnt.drop = drop;
out->rx_cnt.err = err;
out->totals.rx += pps;
out->totals.drop += drop;
out->totals.err += err;
}
}
static void stats_get_cpumap_enqueue(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus)
{
struct record *rec, *prev;
double t, pps, drop, err;
int i, to_cpu;
/* cpumap enqueue stats */
for (to_cpu = 0; to_cpu < sample_n_cpus; to_cpu++) {
rec = &stats_rec->enq[to_cpu];
prev = &stats_prev->enq[to_cpu];
t = calc_period(rec, prev);
pps = calc_pps(&rec->total, &prev->total, t);
drop = calc_drop_pps(&rec->total, &prev->total, t);
err = calc_errs_pps(&rec->total, &prev->total, t);
if (pps > 0 || drop > 0) {
char str[64];
snprintf(str, sizeof(str), "enqueue to cpu %d", to_cpu);
if (err > 0)
err = pps / err; /* calc average bulk size */
print_err(drop,
" %-20s " FMT_COLUMNf FMT_COLUMNf __COLUMN(
".2f") "\n",
str, PPS(pps), DROP(drop), err, "bulk-avg");
}
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
char str[64];
pps = calc_pps(r, p, t);
drop = calc_drop_pps(r, p, t);
err = calc_errs_pps(r, p, t);
if (!pps && !drop && !err)
continue;
snprintf(str, sizeof(str), "cpu:%d->%d", i, to_cpu);
if (err > 0)
err = pps / err; /* calc average bulk size */
print_default(
" %-18s " FMT_COLUMNf FMT_COLUMNf __COLUMN(
".2f") "\n",
str, PPS(pps), DROP(drop), err, "bulk-avg");
}
}
}
static void stats_get_cpumap_remote(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus)
{
double xdp_pass, xdp_drop, xdp_redirect;
struct record *rec, *prev;
double t;
int i;
rec = &stats_rec->kthread;
prev = &stats_prev->kthread;
t = calc_period(rec, prev);
calc_xdp_pps(&rec->total, &prev->total, &xdp_pass, &xdp_drop,
&xdp_redirect, t);
if (xdp_pass || xdp_drop || xdp_redirect) {
print_err(xdp_drop,
" %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf "\n",
"xdp_stats", PASS(xdp_pass), DROP(xdp_drop),
REDIR(xdp_redirect));
}
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
char str[64];
calc_xdp_pps(r, p, &xdp_pass, &xdp_drop, &xdp_redirect, t);
if (!xdp_pass && !xdp_drop && !xdp_redirect)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
print_default(" %-16s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
"\n",
str, PASS(xdp_pass), DROP(xdp_drop),
REDIR(xdp_redirect));
}
}
static void stats_get_cpumap_kthread(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus)
{
struct record *rec, *prev;
double t, pps, drop, err;
int i;
rec = &stats_rec->kthread;
prev = &stats_prev->kthread;
t = calc_period(rec, prev);
pps = calc_pps(&rec->total, &prev->total, t);
drop = calc_drop_pps(&rec->total, &prev->total, t);
err = calc_errs_pps(&rec->total, &prev->total, t);
print_err(drop, " %-20s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf "\n",
pps ? "kthread total" : "kthread", PPS(pps), DROP(drop), err,
"sched");
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
char str[64];
pps = calc_pps(r, p, t);
drop = calc_drop_pps(r, p, t);
err = calc_errs_pps(r, p, t);
if (!pps && !drop && !err)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
print_default(" %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
"\n",
str, PPS(pps), DROP(drop), err, "sched");
}
}
static void stats_get_redirect_cnt(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus,
struct sample_output *out)
{
struct record *rec, *prev;
double t, pps;
int i;
rec = &stats_rec->redir_err[0];
prev = &stats_prev->redir_err[0];
t = calc_period(rec, prev);
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
char str[64];
pps = calc_pps(r, p, t);
if (!pps)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
print_default(" %-18s " FMT_COLUMNf "\n", str, REDIR(pps));
}
if (out) {
pps = calc_pps(&rec->total, &prev->total, t);
out->redir_cnt.suc = pps;
out->totals.redir += pps;
}
}
static void stats_get_redirect_err_cnt(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus,
struct sample_output *out)
{
struct record *rec, *prev;
double t, drop, sum = 0;
int rec_i, i;
for (rec_i = 1; rec_i < XDP_REDIRECT_ERR_MAX; rec_i++) {
char str[64];
rec = &stats_rec->redir_err[rec_i];
prev = &stats_prev->redir_err[rec_i];
t = calc_period(rec, prev);
drop = calc_drop_pps(&rec->total, &prev->total, t);
if (drop > 0 && !out) {
snprintf(str, sizeof(str),
sample_log_level & LL_DEFAULT ? "%s total" :
"%s",
xdp_redirect_err_names[rec_i]);
print_err(drop, " %-18s " FMT_COLUMNf "\n", str,
ERR(drop));
}
for (i = 0; i < nr_cpus; i++) {
struct datarec *r = &rec->cpu[i];
struct datarec *p = &prev->cpu[i];
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));
}
sum += drop;
}
if (out) {
out->redir_cnt.err = sum;
out->totals.err += sum;
}
}
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_get_devmap_xmit(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus,
struct sample_output *out)
{
double pps, drop, info, err;
struct record *rec, *prev;
double t;
int i;
rec = &stats_rec->devmap_xmit;
prev = &stats_prev->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];
char str[64];
pps = calc_pps(r, p, t);
drop = calc_drop_pps(r, p, t);
err = calc_errs_pps(r, p, t);
if (!pps && !drop && !err)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
info = calc_info_pps(r, p, t);
if (info > 0)
info = (pps + drop) / info; /* calc avg bulk */
print_default(" %-18s" FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
__COLUMN(".2f") "\n",
str, XMIT(pps), DROP(drop), err, "drv_err/s",
info, "bulk-avg");
}
if (out) {
pps = calc_pps(&rec->total, &prev->total, t);
drop = calc_drop_pps(&rec->total, &prev->total, t);
info = calc_info_pps(&rec->total, &prev->total, t);
if (info > 0)
info = (pps + drop) / info; /* calc avg bulk */
err = calc_errs_pps(&rec->total, &prev->total, t);
out->xmit_cnt.pps = pps;
out->xmit_cnt.drop = drop;
out->xmit_cnt.bavg = info;
out->xmit_cnt.err = err;
out->totals.xmit += pps;
out->totals.drop_xmit += drop;
out->totals.err += err;
}
}
static void stats_get_devmap_xmit_multi(struct stats_record *stats_rec,
struct stats_record *stats_prev,
unsigned int nr_cpus,
struct sample_output *out,
bool xmit_total)
{
double pps, drop, info, err;
struct map_entry *entry;
struct record *r, *p;
double t;
int bkt;
hash_for_each(stats_rec->xmit_map, bkt, entry, node) {
struct map_entry *e, *x = NULL;
char ifname_from[IFNAMSIZ];
char ifname_to[IFNAMSIZ];
const char *fstr, *tstr;
unsigned long prev_time;
struct record beg = {};
__u32 from_idx, to_idx;
char str[128];
__u64 pair;
int i;
prev_time = sample_interval * NANOSEC_PER_SEC;
pair = entry->pair;
from_idx = pair >> 32;
to_idx = pair & 0xFFFFFFFF;
r = &entry->val;
beg.timestamp = r->timestamp - prev_time;
/* Find matching entry from stats_prev map */
hash_for_each_possible(stats_prev->xmit_map, e, node, pair) {
if (e->pair == pair) {
x = e;
break;
}
}
if (x)
p = &x->val;
else
p = &beg;
t = calc_period(r, p);
pps = calc_pps(&r->total, &p->total, t);
drop = calc_drop_pps(&r->total, &p->total, t);
info = calc_info_pps(&r->total, &p->total, t);
if (info > 0)
info = (pps + drop) / info; /* calc avg bulk */
err = calc_errs_pps(&r->total, &p->total, t);
if (out) {
/* We are responsible for filling out totals */
out->totals.xmit += pps;
out->totals.drop_xmit += drop;
out->totals.err += err;
continue;
}
fstr = tstr = NULL;
if (if_indextoname(from_idx, ifname_from))
fstr = ifname_from;
if (if_indextoname(to_idx, ifname_to))
tstr = ifname_to;
snprintf(str, sizeof(str), "xmit %s->%s", fstr ?: "?",
tstr ?: "?");
/* Skip idle streams of redirection */
if (pps || drop || err) {
print_err(drop,
" %-20s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
__COLUMN(".2f") "\n", str, XMIT(pps), DROP(drop),
err, "drv_err/s", info, "bulk-avg");
}
for (i = 0; i < nr_cpus; i++) {
struct datarec *rc = &r->cpu[i];
struct datarec *pc, p_beg = {};
char str[64];
pc = p == &beg ? &p_beg : &p->cpu[i];
pps = calc_pps(rc, pc, t);
drop = calc_drop_pps(rc, pc, t);
err = calc_errs_pps(rc, pc, t);
if (!pps && !drop && !err)
continue;
snprintf(str, sizeof(str), "cpu:%d", i);
info = calc_info_pps(rc, pc, t);
if (info > 0)
info = (pps + drop) / info; /* calc avg bulk */
print_default(" %-18s" FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
__COLUMN(".2f") "\n", str, XMIT(pps),
DROP(drop), err, "drv_err/s", info, "bulk-avg");
}
}
}
static void stats_print(const char *prefix, int mask, struct stats_record *r,
struct stats_record *p, struct sample_output *out)
{
int nr_cpus = libbpf_num_possible_cpus();
const char *str;
print_always("%-23s", prefix ?: "Summary");
if (mask & SAMPLE_RX_CNT)
print_always(FMT_COLUMNl, RX(out->totals.rx));
if (mask & SAMPLE_REDIRECT_CNT)
print_always(FMT_COLUMNl, REDIR(out->totals.redir));
printf(FMT_COLUMNl,
out->totals.err + out->totals.drop + out->totals.drop_xmit,
"err,drop/s");
if (mask & SAMPLE_DEVMAP_XMIT_CNT ||
mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
printf(FMT_COLUMNl, XMIT(out->totals.xmit));
printf("\n");
if (mask & SAMPLE_RX_CNT) {
str = (sample_log_level & LL_DEFAULT) && out->rx_cnt.pps ?
"receive total" :
"receive";
print_err((out->rx_cnt.err || out->rx_cnt.drop),
" %-20s " FMT_COLUMNl FMT_COLUMNl FMT_COLUMNl "\n",
str, PPS(out->rx_cnt.pps), DROP(out->rx_cnt.drop),
ERR(out->rx_cnt.err));
stats_get_rx_cnt(r, p, nr_cpus, NULL);
}
if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT)
stats_get_cpumap_enqueue(r, p, nr_cpus);
if (mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
stats_get_cpumap_kthread(r, p, nr_cpus);
stats_get_cpumap_remote(r, p, nr_cpus);
}
if (mask & SAMPLE_REDIRECT_CNT) {
str = out->redir_cnt.suc ? "redirect total" : "redirect";
print_default(" %-20s " FMT_COLUMNl "\n", str,
REDIR(out->redir_cnt.suc));
stats_get_redirect_cnt(r, p, nr_cpus, NULL);
}
if (mask & SAMPLE_REDIRECT_ERR_CNT) {
str = (sample_log_level & LL_DEFAULT) && out->redir_cnt.err ?
"redirect_err total" :
"redirect_err";
print_err(out->redir_cnt.err, " %-20s " FMT_COLUMNl "\n", str,
ERR(out->redir_cnt.err));
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 (mask & SAMPLE_DEVMAP_XMIT_CNT) {
str = (sample_log_level & LL_DEFAULT) && out->xmit_cnt.pps ?
"devmap_xmit total" :
"devmap_xmit";
print_err(out->xmit_cnt.err || out->xmit_cnt.drop,
" %-20s " FMT_COLUMNl FMT_COLUMNl FMT_COLUMNl
__COLUMN(".2f") "\n",
str, XMIT(out->xmit_cnt.pps),
DROP(out->xmit_cnt.drop), out->xmit_cnt.err,
"drv_err/s", out->xmit_cnt.bavg, "bulk-avg");
stats_get_devmap_xmit(r, p, nr_cpus, NULL);
}
if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
stats_get_devmap_xmit_multi(r, p, nr_cpus, NULL,
mask & SAMPLE_DEVMAP_XMIT_CNT);
if (sample_log_level & LL_DEFAULT ||
((sample_log_level & LL_SIMPLE) && sample_err_exp)) {
sample_err_exp = false;
printf("\n");
}
}
int sample_setup_maps(struct bpf_map **maps)
{
sample_n_cpus = libbpf_num_possible_cpus();
for (int i = 0; i < MAP_DEVMAP_XMIT_MULTI; i++) {
sample_map[i] = maps[i];
switch (i) {
case MAP_RX:
case MAP_CPUMAP_KTHREAD:
case MAP_DEVMAP_XMIT:
sample_map_count[i] = sample_n_cpus;
break;
case MAP_REDIRECT_ERR:
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;
case MAP_CPUMAP_ENQUEUE:
sample_map_count[i] = sample_n_cpus * sample_n_cpus;
break;
default:
return -EINVAL;
}
if (bpf_map__set_max_entries(sample_map[i], sample_map_count[i]) < 0)
return -errno;
}
sample_map[MAP_DEVMAP_XMIT_MULTI] = maps[MAP_DEVMAP_XMIT_MULTI];
return 0;
}
static int sample_setup_maps_mappings(void)
{
for (int i = 0; i < MAP_DEVMAP_XMIT_MULTI; i++) {
size_t size = sample_map_count[i] * sizeof(struct datarec);
sample_mmap[i] = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, bpf_map__fd(sample_map[i]), 0);
if (sample_mmap[i] == MAP_FAILED)
return -errno;
}
return 0;
}
int __sample_init(int mask)
{
sigset_t st;
sigemptyset(&st);
sigaddset(&st, SIGQUIT);
sigaddset(&st, SIGINT);
sigaddset(&st, SIGTERM);
if (sigprocmask(SIG_BLOCK, &st, NULL) < 0)
return -errno;
sample_sig_fd = signalfd(-1, &st, SFD_CLOEXEC | SFD_NONBLOCK);
if (sample_sig_fd < 0)
return -errno;
sample_mask = mask;
return sample_setup_maps_mappings();
}
static int __sample_remove_xdp(int ifindex, __u32 prog_id, int xdp_flags)
{
__u32 cur_prog_id = 0;
int ret;
if (prog_id) {
ret = bpf_xdp_query_id(ifindex, xdp_flags, &cur_prog_id);
if (ret < 0)
return -errno;
if (prog_id != cur_prog_id) {
print_always(
"Program on ifindex %d does not match installed "
"program, skipping unload\n",
ifindex);
return -ENOENT;
}
}
return bpf_xdp_detach(ifindex, xdp_flags, NULL);
}
int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
bool force)
{
int ret, xdp_flags = 0;
__u32 prog_id = 0;
if (sample_xdp_cnt == 32) {
fprintf(stderr,
"Total limit for installed XDP programs in a sample reached\n");
return -ENOTSUP;
}
xdp_flags |= !force ? XDP_FLAGS_UPDATE_IF_NOEXIST : 0;
xdp_flags |= generic ? XDP_FLAGS_SKB_MODE : XDP_FLAGS_DRV_MODE;
ret = bpf_xdp_attach(ifindex, bpf_program__fd(xdp_prog), xdp_flags, NULL);
if (ret < 0) {
ret = -errno;
fprintf(stderr,
"Failed to install program \"%s\" on ifindex %d, mode = %s, "
"force = %s: %s\n",
bpf_program__name(xdp_prog), ifindex,
generic ? "skb" : "native", force ? "true" : "false",
strerror(-ret));
return ret;
}
ret = bpf_xdp_query_id(ifindex, xdp_flags, &prog_id);
if (ret < 0) {
ret = -errno;
fprintf(stderr,
"Failed to get XDP program id for ifindex %d, removing program: %s\n",
ifindex, strerror(errno));
__sample_remove_xdp(ifindex, 0, xdp_flags);
return ret;
}
sample_xdp_progs[sample_xdp_cnt++] =
(struct xdp_desc){ ifindex, prog_id, xdp_flags };
return 0;
}
static void sample_summary_print(void)
{
double num = sample_out.rx_cnt.num;
if (sample_out.totals.rx) {
double pkts = sample_out.totals.rx;
print_always(" Packets received : %'-10llu\n",
sample_out.totals.rx);
print_always(" Average packets/s : %'-10.0f\n",
sample_round(pkts / num));
}
if (sample_out.totals.redir) {
double pkts = sample_out.totals.redir;
print_always(" Packets redirected : %'-10llu\n",
sample_out.totals.redir);
print_always(" Average redir/s : %'-10.0f\n",
sample_round(pkts / num));
}
if (sample_out.totals.drop)
print_always(" Rx dropped : %'-10llu\n",
sample_out.totals.drop);
if (sample_out.totals.drop_xmit)
print_always(" Tx dropped : %'-10llu\n",
sample_out.totals.drop_xmit);
if (sample_out.totals.err)
print_always(" Errors recorded : %'-10llu\n",
sample_out.totals.err);
if (sample_out.totals.xmit) {
double pkts = sample_out.totals.xmit;
print_always(" Packets transmitted : %'-10llu\n",
sample_out.totals.xmit);
print_always(" Average transmit/s : %'-10.0f\n",
sample_round(pkts / num));
}
}
void sample_exit(int status)
{
size_t size;
for (int i = 0; i < NUM_MAP; i++) {
size = sample_map_count[i] * sizeof(**sample_mmap);
munmap(sample_mmap[i], size);
}
while (sample_xdp_cnt--) {
int i = sample_xdp_cnt, ifindex, xdp_flags;
__u32 prog_id;
prog_id = sample_xdp_progs[i].prog_id;
ifindex = sample_xdp_progs[i].ifindex;
xdp_flags = sample_xdp_progs[i].flags;
__sample_remove_xdp(ifindex, prog_id, xdp_flags);
}
sample_summary_print();
close(sample_sig_fd);
exit(status);
}
static int sample_stats_collect(struct stats_record *rec)
{
int i;
if (sample_mask & SAMPLE_RX_CNT)
map_collect_percpu(sample_mmap[MAP_RX], &rec->rx_cnt);
if (sample_mask & SAMPLE_REDIRECT_CNT)
map_collect_percpu(sample_mmap[MAP_REDIRECT_ERR], &rec->redir_err[0]);
if (sample_mask & SAMPLE_REDIRECT_ERR_CNT) {
for (i = 1; i < XDP_REDIRECT_ERR_MAX; i++)
map_collect_percpu(&sample_mmap[MAP_REDIRECT_ERR][i * sample_n_cpus],
&rec->redir_err[i]);
}
if (sample_mask & SAMPLE_CPUMAP_ENQUEUE_CNT)
for (i = 0; i < sample_n_cpus; i++)
map_collect_percpu(&sample_mmap[MAP_CPUMAP_ENQUEUE][i * sample_n_cpus],
&rec->enq[i]);
if (sample_mask & SAMPLE_CPUMAP_KTHREAD_CNT)
map_collect_percpu(sample_mmap[MAP_CPUMAP_KTHREAD],
&rec->kthread);
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]);
if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT)
map_collect_percpu(sample_mmap[MAP_DEVMAP_XMIT], &rec->devmap_xmit);
if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI) {
if (map_collect_percpu_devmap(bpf_map__fd(sample_map[MAP_DEVMAP_XMIT_MULTI]), rec) < 0)
return -EINVAL;
}
return 0;
}
static void sample_summary_update(struct sample_output *out)
{
sample_out.totals.rx += out->totals.rx;
sample_out.totals.redir += out->totals.redir;
sample_out.totals.drop += out->totals.drop;
sample_out.totals.drop_xmit += out->totals.drop_xmit;
sample_out.totals.err += out->totals.err;
sample_out.totals.xmit += out->totals.xmit;
sample_out.rx_cnt.num++;
}
static void sample_stats_print(int mask, struct stats_record *cur,
struct stats_record *prev, char *prog_name)
{
struct sample_output out = {};
if (mask & SAMPLE_RX_CNT)
stats_get_rx_cnt(cur, prev, 0, &out);
if (mask & SAMPLE_REDIRECT_CNT)
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);
if (mask & SAMPLE_DEVMAP_XMIT_CNT)
stats_get_devmap_xmit(cur, prev, 0, &out);
else if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
stats_get_devmap_xmit_multi(cur, prev, 0, &out,
mask & SAMPLE_DEVMAP_XMIT_CNT);
sample_summary_update(&out);
stats_print(prog_name, mask, cur, prev, &out);
}
void sample_switch_mode(void)
{
sample_log_level ^= LL_DEBUG - 1;
}
static int sample_signal_cb(void)
{
struct signalfd_siginfo si;
int r;
r = read(sample_sig_fd, &si, sizeof(si));
if (r < 0)
return -errno;
switch (si.ssi_signo) {
case SIGQUIT:
sample_switch_mode();
printf("\n");
break;
default:
printf("\n");
return 1;
}
return 0;
}
/* Pointer swap trick */
static void swap(struct stats_record **a, struct stats_record **b)
{
struct stats_record *tmp;
tmp = *a;
*a = *b;
*b = tmp;
}
static int sample_timer_cb(int timerfd, struct stats_record **rec,
struct stats_record **prev)
{
char line[64] = "Summary";
int ret;
__u64 t;
ret = read(timerfd, &t, sizeof(t));
if (ret < 0)
return -errno;
swap(prev, rec);
ret = sample_stats_collect(*rec);
if (ret < 0)
return ret;
if (sample_xdp_cnt == 2 && !(sample_mask & SAMPLE_SKIP_HEADING)) {
char fi[IFNAMSIZ];
char to[IFNAMSIZ];
const char *f, *t;
f = t = NULL;
if (if_indextoname(sample_xdp_progs[0].ifindex, fi))
f = fi;
if (if_indextoname(sample_xdp_progs[1].ifindex, to))
t = to;
snprintf(line, sizeof(line), "%s->%s", f ?: "?", t ?: "?");
}
sample_stats_print(sample_mask, *rec, *prev, line);
return 0;
}
int sample_run(int interval, void (*post_cb)(void *), void *ctx)
{
struct timespec ts = { interval, 0 };
struct itimerspec its = { ts, ts };
struct stats_record *rec, *prev;
struct pollfd pfd[2] = {};
int timerfd, ret;
if (!interval) {
fprintf(stderr, "Incorrect interval 0\n");
return -EINVAL;
}
sample_interval = interval;
/* Pretty print numbers */
setlocale(LC_NUMERIC, "en_US.UTF-8");
timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
if (timerfd < 0)
return -errno;
timerfd_settime(timerfd, 0, &its, NULL);
pfd[0].fd = sample_sig_fd;
pfd[0].events = POLLIN;
pfd[1].fd = timerfd;
pfd[1].events = POLLIN;
ret = -ENOMEM;
rec = alloc_stats_record();
if (!rec)
goto end;
prev = alloc_stats_record();
if (!prev)
goto end_rec;
ret = sample_stats_collect(rec);
if (ret < 0)
goto end_rec_prev;
for (;;) {
ret = poll(pfd, 2, -1);
if (ret < 0) {
if (errno == EINTR)
continue;
else
break;
}
if (pfd[0].revents & POLLIN)
ret = sample_signal_cb();
else if (pfd[1].revents & POLLIN)
ret = sample_timer_cb(timerfd, &rec, &prev);
if (ret)
break;
if (post_cb)
post_cb(ctx);
}
end_rec_prev:
free_stats_record(prev);
end_rec:
free_stats_record(rec);
end:
close(timerfd);
return ret;
}
const char *get_driver_name(int ifindex)
{
struct ethtool_drvinfo drv = {};
char ifname[IF_NAMESIZE];
static char drvname[32];
struct ifreq ifr = {};
int fd, r = 0;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
return "[error]";
if (!if_indextoname(ifindex, ifname))
goto end;
drv.cmd = ETHTOOL_GDRVINFO;
safe_strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
ifr.ifr_data = (void *)&drv;
r = ioctl(fd, SIOCETHTOOL, &ifr);
if (r)
goto end;
safe_strncpy(drvname, drv.driver, sizeof(drvname));
close(fd);
return drvname;
end:
r = errno;
close(fd);
return r == EOPNOTSUPP ? "loopback" : "[error]";
}
int get_mac_addr(int ifindex, void *mac_addr)
{
char ifname[IF_NAMESIZE];
struct ifreq ifr = {};
int fd, r;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
return -errno;
if (!if_indextoname(ifindex, ifname)) {
r = -errno;
goto end;
}
safe_strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
r = ioctl(fd, SIOCGIFHWADDR, &ifr);
if (r) {
r = -errno;
goto end;
}
memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char));
end:
close(fd);
return r;
}
__attribute__((constructor)) static void sample_ctor(void)
{
if (libbpf_set_strict_mode(LIBBPF_STRICT_ALL) < 0) {
fprintf(stderr, "Failed to set libbpf strict mode: %s\n",
strerror(errno));
/* Just exit, nothing to cleanup right now */
exit(EXIT_FAIL_BPF);
}
}