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-rw-r--r--samples/bpf/xdp_sample_shared.h17
-rw-r--r--samples/bpf/xdp_sample_user.c838
-rw-r--r--samples/bpf/xdp_sample_user.h60
3 files changed, 915 insertions, 0 deletions
diff --git a/samples/bpf/xdp_sample_shared.h b/samples/bpf/xdp_sample_shared.h
new file mode 100644
index 000000000000..8a7669a5d563
--- /dev/null
+++ b/samples/bpf/xdp_sample_shared.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#ifndef _XDP_SAMPLE_SHARED_H
+#define _XDP_SAMPLE_SHARED_H
+
+struct datarec {
+ size_t processed;
+ size_t dropped;
+ size_t issue;
+ union {
+ size_t xdp_pass;
+ size_t info;
+ };
+ size_t xdp_drop;
+ size_t xdp_redirect;
+} __attribute__((aligned(64)));
+
+#endif
diff --git a/samples/bpf/xdp_sample_user.c b/samples/bpf/xdp_sample_user.c
new file mode 100644
index 000000000000..073aa3424e4b
--- /dev/null
+++ b/samples/bpf/xdp_sample_user.c
@@ -0,0 +1,838 @@
+// 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/resource.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,
+ 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 sample_output {
+ struct {
+ __u64 rx;
+ } totals;
+ struct {
+ __u64 pps;
+ __u64 drop;
+ __u64 err;
+ } rx_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 __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 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");
+ }
+}
+
+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 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;
+ }
+ }
+
+ return rec;
+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;
+
+ 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_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));
+ 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 (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 < NUM_MAP; i++) {
+ sample_map[i] = maps[i];
+
+ switch (i) {
+ case MAP_RX:
+ sample_map_count[i] = sample_n_cpus;
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (bpf_map__resize(sample_map[i], sample_map_count[i]) < 0)
+ return -errno;
+ }
+ return 0;
+}
+
+static int sample_setup_maps_mappings(void)
+{
+ for (int i = 0; i < NUM_MAP; 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_get_link_xdp_id(ifindex, &cur_prog_id, xdp_flags);
+ 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_set_link_xdp_fd(ifindex, -1, xdp_flags);
+}
+
+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_set_link_xdp_fd(ifindex, bpf_program__fd(xdp_prog),
+ xdp_flags);
+ 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_get_link_xdp_id(ifindex, &prog_id, xdp_flags);
+ 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 period = sample_out.rx_cnt.pps;
+
+ 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 / period));
+ }
+}
+
+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);
+
+ return 0;
+}
+
+static void sample_summary_update(struct sample_output *out, int interval)
+{
+ sample_out.totals.rx += out->totals.rx;
+ sample_out.rx_cnt.pps += interval;
+}
+
+static void sample_stats_print(int mask, struct stats_record *cur,
+ struct stats_record *prev, char *prog_name,
+ int interval)
+{
+ struct sample_output out = {};
+
+ if (mask & SAMPLE_RX_CNT)
+ stats_get_rx_cnt(cur, prev, 0, &out);
+ sample_summary_update(&out, interval);
+
+ 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, int interval)
+{
+ 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) {
+ 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, interval);
+ 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, interval);
+
+ 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);
+ }
+}
diff --git a/samples/bpf/xdp_sample_user.h b/samples/bpf/xdp_sample_user.h
new file mode 100644
index 000000000000..d630998df547
--- /dev/null
+++ b/samples/bpf/xdp_sample_user.h
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#ifndef XDP_SAMPLE_USER_H
+#define XDP_SAMPLE_USER_H
+
+#include <bpf/libbpf.h>
+#include <linux/compiler.h>
+
+#include "xdp_sample_shared.h"
+
+enum stats_mask {
+ _SAMPLE_REDIRECT_MAP = 1U << 0,
+ SAMPLE_RX_CNT = 1U << 1,
+};
+
+/* Exit return codes */
+#define EXIT_OK 0
+#define EXIT_FAIL 1
+#define EXIT_FAIL_OPTION 2
+#define EXIT_FAIL_XDP 3
+#define EXIT_FAIL_BPF 4
+#define EXIT_FAIL_MEM 5
+
+int sample_setup_maps(struct bpf_map **maps);
+int __sample_init(int mask);
+void sample_exit(int status);
+int sample_run(int interval, void (*post_cb)(void *), void *ctx);
+
+void sample_switch_mode(void);
+int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
+ bool force);
+void sample_usage(char *argv[], const struct option *long_options,
+ const char *doc, int mask, bool error);
+
+const char *get_driver_name(int ifindex);
+int get_mac_addr(int ifindex, void *mac_addr);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-truncation"
+__attribute__((unused))
+static inline char *safe_strncpy(char *dst, const char *src, size_t size)
+{
+ if (!size)
+ return dst;
+ strncpy(dst, src, size - 1);
+ dst[size - 1] = '\0';
+ return dst;
+}
+#pragma GCC diagnostic pop
+
+#define DEFINE_SAMPLE_INIT(name) \
+ static int sample_init(struct name *skel, int mask) \
+ { \
+ int ret; \
+ ret = __sample_init(mask); \
+ if (ret < 0) \
+ return ret; \
+ return 0; \
+ }
+
+#endif
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.