+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0
- * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
- */
-static const char *__doc__ = " XDP RX-queue info extract example\n\n"
- "Monitor how many packets per sec (pps) are received\n"
- "per NIC RX queue index and which CPU processed the packet\n"
- ;
-
-#include <errno.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <string.h>
-#include <unistd.h>
-#include <locale.h>
-#include <getopt.h>
-#include <net/if.h>
-#include <time.h>
-#include <limits.h>
-#include <arpa/inet.h>
-#include <linux/if_link.h>
-
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-#include "bpf_util.h"
-
-static int ifindex = -1;
-static char ifname_buf[IF_NAMESIZE];
-static char *ifname;
-static __u32 prog_id;
-
-static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
-
-static struct bpf_map *stats_global_map;
-static struct bpf_map *rx_queue_index_map;
-
-/* 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
-
-#define FAIL_MEM_SIG INT_MAX
-#define FAIL_STAT_SIG (INT_MAX - 1)
-
-static const struct option long_options[] = {
- {"help", no_argument, NULL, 'h' },
- {"dev", required_argument, NULL, 'd' },
- {"skb-mode", no_argument, NULL, 'S' },
- {"sec", required_argument, NULL, 's' },
- {"no-separators", no_argument, NULL, 'z' },
- {"action", required_argument, NULL, 'a' },
- {"readmem", no_argument, NULL, 'r' },
- {"swapmac", no_argument, NULL, 'm' },
- {"force", no_argument, NULL, 'F' },
- {0, 0, NULL, 0 }
-};
-
-static void int_exit(int sig)
-{
- __u32 curr_prog_id = 0;
-
- if (ifindex > -1) {
- if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) {
- printf("bpf_xdp_query_id failed\n");
- exit(EXIT_FAIL);
- }
- if (prog_id == curr_prog_id) {
- fprintf(stderr,
- "Interrupted: Removing XDP program on ifindex:%d device:%s\n",
- ifindex, ifname);
- bpf_xdp_detach(ifindex, xdp_flags, NULL);
- } else if (!curr_prog_id) {
- printf("couldn't find a prog id on a given iface\n");
- } else {
- printf("program on interface changed, not removing\n");
- }
- }
-
- if (sig == FAIL_MEM_SIG)
- exit(EXIT_FAIL_MEM);
- else if (sig == FAIL_STAT_SIG)
- exit(EXIT_FAIL);
-
- exit(EXIT_OK);
-}
-
-struct config {
- __u32 action;
- int ifindex;
- __u32 options;
-};
-enum cfg_options_flags {
- NO_TOUCH = 0x0U,
- READ_MEM = 0x1U,
- SWAP_MAC = 0x2U,
-};
-#define XDP_ACTION_MAX (XDP_TX + 1)
-#define XDP_ACTION_MAX_STRLEN 11
-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",
-};
-
-static const char *action2str(int action)
-{
- if (action < XDP_ACTION_MAX)
- return xdp_action_names[action];
- return NULL;
-}
-
-static int parse_xdp_action(char *action_str)
-{
- size_t maxlen;
- __u64 action = -1;
- int i;
-
- for (i = 0; i < XDP_ACTION_MAX; i++) {
- maxlen = XDP_ACTION_MAX_STRLEN;
- if (strncmp(xdp_action_names[i], action_str, maxlen) == 0) {
- action = i;
- break;
- }
- }
- return action;
-}
-
-static void list_xdp_actions(void)
-{
- int i;
-
- printf("Available XDP --action <options>\n");
- for (i = 0; i < XDP_ACTION_MAX; i++)
- printf("\t%s\n", xdp_action_names[i]);
- printf("\n");
-}
-
-static char* options2str(enum cfg_options_flags flag)
-{
- if (flag == NO_TOUCH)
- return "no_touch";
- if (flag & SWAP_MAC)
- return "swapmac";
- if (flag & READ_MEM)
- return "read";
- fprintf(stderr, "ERR: Unknown config option flags");
- int_exit(FAIL_STAT_SIG);
- return "unknown";
-}
-
-static void usage(char *argv[])
-{
- int i;
-
- printf("\nDOCUMENTATION:\n%s\n", __doc__);
- printf(" Usage: %s (options-see-below)\n", argv[0]);
- printf(" Listing options:\n");
- for (i = 0; long_options[i].name != 0; i++) {
- printf(" --%-12s", 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");
- list_xdp_actions();
-}
-
-#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);
- int_exit(FAIL_STAT_SIG);
- }
- return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
-}
-
-/* Common stats data record shared with _kern.c */
-struct datarec {
- __u64 processed;
- __u64 issue;
-};
-struct record {
- __u64 timestamp;
- struct datarec total;
- struct datarec *cpu;
-};
-struct stats_record {
- struct record stats;
- struct record *rxq;
-};
-
-static struct datarec *alloc_record_per_cpu(void)
-{
- unsigned int nr_cpus = bpf_num_possible_cpus();
- struct datarec *array;
-
- array = calloc(nr_cpus, sizeof(struct datarec));
- if (!array) {
- fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
- int_exit(FAIL_MEM_SIG);
- }
- return array;
-}
-
-static struct record *alloc_record_per_rxq(void)
-{
- unsigned int nr_rxqs = bpf_map__max_entries(rx_queue_index_map);
- struct record *array;
-
- array = calloc(nr_rxqs, sizeof(struct record));
- if (!array) {
- fprintf(stderr, "Mem alloc error (nr_rxqs:%u)\n", nr_rxqs);
- int_exit(FAIL_MEM_SIG);
- }
- return array;
-}
-
-static struct stats_record *alloc_stats_record(void)
-{
- unsigned int nr_rxqs = bpf_map__max_entries(rx_queue_index_map);
- struct stats_record *rec;
- int i;
-
- rec = calloc(1, sizeof(struct stats_record));
- if (!rec) {
- fprintf(stderr, "Mem alloc error\n");
- int_exit(FAIL_MEM_SIG);
- }
- rec->rxq = alloc_record_per_rxq();
- for (i = 0; i < nr_rxqs; i++)
- rec->rxq[i].cpu = alloc_record_per_cpu();
-
- rec->stats.cpu = alloc_record_per_cpu();
- return rec;
-}
-
-static void free_stats_record(struct stats_record *r)
-{
- unsigned int nr_rxqs = bpf_map__max_entries(rx_queue_index_map);
- int i;
-
- for (i = 0; i < nr_rxqs; i++)
- free(r->rxq[i].cpu);
-
- free(r->rxq);
- free(r->stats.cpu);
- free(r);
-}
-
-static bool map_collect_percpu(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_issue = 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].issue = values[i].issue;
- sum_issue += values[i].issue;
- }
- rec->total.processed = sum_processed;
- rec->total.issue = sum_issue;
- return true;
-}
-
-static void stats_collect(struct stats_record *rec)
-{
- int fd, i, max_rxqs;
-
- fd = bpf_map__fd(stats_global_map);
- map_collect_percpu(fd, 0, &rec->stats);
-
- fd = bpf_map__fd(rx_queue_index_map);
- max_rxqs = bpf_map__max_entries(rx_queue_index_map);
- for (i = 0; i < max_rxqs; i++)
- map_collect_percpu(fd, i, &rec->rxq[i]);
-}
-
-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 __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 = 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 = packets / period_;
- }
- return pps;
-}
-
-static void stats_print(struct stats_record *stats_rec,
- struct stats_record *stats_prev,
- int action, __u32 cfg_opt)
-{
- unsigned int nr_rxqs = bpf_map__max_entries(rx_queue_index_map);
- unsigned int nr_cpus = bpf_num_possible_cpus();
- double pps = 0, err = 0;
- struct record *rec, *prev;
- double t;
- int rxq;
- int i;
-
- /* Header */
- printf("\nRunning XDP on dev:%s (ifindex:%d) action:%s options:%s\n",
- ifname, ifindex, action2str(action), options2str(cfg_opt));
-
- /* stats_global_map */
- {
- char *fmt_rx = "%-15s %-7d %'-11.0f %'-10.0f %s\n";
- char *fm2_rx = "%-15s %-7s %'-11.0f\n";
- char *errstr = "";
-
- printf("%-15s %-7s %-11s %-11s\n",
- "XDP stats", "CPU", "pps", "issue-pps");
-
- rec = &stats_rec->stats;
- prev = &stats_prev->stats;
- 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);
- err = calc_errs_pps(r, p, t);
- if (err > 0)
- errstr = "invalid-ifindex";
- if (pps > 0)
- printf(fmt_rx, "XDP-RX CPU",
- i, pps, err, errstr);
- }
- pps = calc_pps (&rec->total, &prev->total, t);
- err = calc_errs_pps(&rec->total, &prev->total, t);
- printf(fm2_rx, "XDP-RX CPU", "total", pps, err);
- }
-
- /* rx_queue_index_map */
- printf("\n%-15s %-7s %-11s %-11s\n",
- "RXQ stats", "RXQ:CPU", "pps", "issue-pps");
-
- for (rxq = 0; rxq < nr_rxqs; rxq++) {
- char *fmt_rx = "%-15s %3d:%-3d %'-11.0f %'-10.0f %s\n";
- char *fm2_rx = "%-15s %3d:%-3s %'-11.0f\n";
- char *errstr = "";
- int rxq_ = rxq;
-
- /* Last RXQ in map catch overflows */
- if (rxq_ == nr_rxqs - 1)
- rxq_ = -1;
-
- rec = &stats_rec->rxq[rxq];
- prev = &stats_prev->rxq[rxq];
- 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);
- err = calc_errs_pps(r, p, t);
- if (err > 0) {
- if (rxq_ == -1)
- errstr = "map-overflow-RXQ";
- else
- errstr = "err";
- }
- if (pps > 0)
- printf(fmt_rx, "rx_queue_index",
- rxq_, i, pps, err, errstr);
- }
- pps = calc_pps (&rec->total, &prev->total, t);
- err = calc_errs_pps(&rec->total, &prev->total, t);
- if (pps || err)
- printf(fm2_rx, "rx_queue_index", rxq_, "sum", pps, err);
- }
-}
-
-
-/* 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, int action, __u32 cfg_opt)
-{
- struct stats_record *record, *prev;
-
- record = alloc_stats_record();
- prev = alloc_stats_record();
- stats_collect(record);
-
- while (1) {
- swap(&prev, &record);
- stats_collect(record);
- stats_print(record, prev, action, cfg_opt);
- sleep(interval);
- }
-
- free_stats_record(record);
- free_stats_record(prev);
-}
-
-
-int main(int argc, char **argv)
-{
- __u32 cfg_options= NO_TOUCH ; /* Default: Don't touch packet memory */
- struct bpf_prog_info info = {};
- __u32 info_len = sizeof(info);
- int prog_fd, map_fd, opt, err;
- bool use_separators = true;
- struct config cfg = { 0 };
- struct bpf_program *prog;
- struct bpf_object *obj;
- struct bpf_map *map;
- char filename[256];
- int longindex = 0;
- int interval = 2;
- __u32 key = 0;
-
-
- char action_str_buf[XDP_ACTION_MAX_STRLEN + 1 /* for \0 */] = { 0 };
- int action = XDP_PASS; /* Default action */
- char *action_str = NULL;
-
- snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-
- obj = bpf_object__open_file(filename, NULL);
- if (libbpf_get_error(obj))
- return EXIT_FAIL;
-
- prog = bpf_object__next_program(obj, NULL);
- bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);
-
- err = bpf_object__load(obj);
- if (err)
- return EXIT_FAIL;
- prog_fd = bpf_program__fd(prog);
-
- map = bpf_object__find_map_by_name(obj, "config_map");
- stats_global_map = bpf_object__find_map_by_name(obj, "stats_global_map");
- rx_queue_index_map = bpf_object__find_map_by_name(obj, "rx_queue_index_map");
- if (!map || !stats_global_map || !rx_queue_index_map) {
- printf("finding a map in obj file failed\n");
- return EXIT_FAIL;
- }
- map_fd = bpf_map__fd(map);
-
- if (!prog_fd) {
- fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n", strerror(errno));
- return EXIT_FAIL;
- }
-
- /* Parse commands line args */
- while ((opt = getopt_long(argc, argv, "FhSrmzd:s:a:",
- long_options, &longindex)) != -1) {
- switch (opt) {
- case 'd':
- if (strlen(optarg) >= IF_NAMESIZE) {
- fprintf(stderr, "ERR: --dev name too long\n");
- goto error;
- }
- ifname = (char *)&ifname_buf;
- strncpy(ifname, optarg, IF_NAMESIZE);
- ifindex = if_nametoindex(ifname);
- if (ifindex == 0) {
- fprintf(stderr,
- "ERR: --dev name unknown err(%d):%s\n",
- errno, strerror(errno));
- goto error;
- }
- break;
- case 's':
- interval = atoi(optarg);
- break;
- case 'S':
- xdp_flags |= XDP_FLAGS_SKB_MODE;
- break;
- case 'z':
- use_separators = false;
- break;
- case 'a':
- action_str = (char *)&action_str_buf;
- strncpy(action_str, optarg, XDP_ACTION_MAX_STRLEN);
- break;
- case 'r':
- cfg_options |= READ_MEM;
- break;
- case 'm':
- cfg_options |= SWAP_MAC;
- break;
- case 'F':
- xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
- break;
- case 'h':
- error:
- default:
- usage(argv);
- return EXIT_FAIL_OPTION;
- }
- }
-
- if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
- xdp_flags |= XDP_FLAGS_DRV_MODE;
-
- /* Required option */
- if (ifindex == -1) {
- fprintf(stderr, "ERR: required option --dev missing\n");
- usage(argv);
- return EXIT_FAIL_OPTION;
- }
- cfg.ifindex = ifindex;
-
- /* Parse action string */
- if (action_str) {
- action = parse_xdp_action(action_str);
- if (action < 0) {
- fprintf(stderr, "ERR: Invalid XDP --action: %s\n",
- action_str);
- list_xdp_actions();
- return EXIT_FAIL_OPTION;
- }
- }
- cfg.action = action;
-
- /* XDP_TX requires changing MAC-addrs, else HW may drop */
- if (action == XDP_TX)
- cfg_options |= SWAP_MAC;
- cfg.options = cfg_options;
-
- /* Trick to pretty printf with thousands separators use %' */
- if (use_separators)
- setlocale(LC_NUMERIC, "en_US");
-
- /* User-side setup ifindex in config_map */
- err = bpf_map_update_elem(map_fd, &key, &cfg, 0);
- if (err) {
- fprintf(stderr, "Store config failed (err:%d)\n", err);
- exit(EXIT_FAIL_BPF);
- }
-
- /* Remove XDP program when program is interrupted or killed */
- signal(SIGINT, int_exit);
- signal(SIGTERM, int_exit);
-
- if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
- fprintf(stderr, "link set xdp fd failed\n");
- return EXIT_FAIL_XDP;
- }
-
- err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
- if (err) {
- printf("can't get prog info - %s\n", strerror(errno));
- return err;
- }
- prog_id = info.id;
-
- stats_poll(interval, action, cfg_options);
- return EXIT_OK;
-}
projects / linux.git / commitdiff