602 lines
14 KiB
C
602 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
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*/
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static const char *__doc__ = " XDP RX-queue info extract example\n\n"
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"Monitor how many packets per sec (pps) are received\n"
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"per NIC RX queue index and which CPU processed the packet\n"
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;
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <locale.h>
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#include <sys/resource.h>
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#include <getopt.h>
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#include <net/if.h>
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#include <time.h>
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#include <arpa/inet.h>
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#include <linux/if_link.h>
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#include "bpf.h"
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#include "libbpf.h"
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#include "bpf_util.h"
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static int ifindex = -1;
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static char ifname_buf[IF_NAMESIZE];
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static char *ifname;
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static __u32 prog_id;
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static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
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static struct bpf_map *stats_global_map;
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static struct bpf_map *rx_queue_index_map;
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/* Exit return codes */
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#define EXIT_OK 0
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#define EXIT_FAIL 1
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#define EXIT_FAIL_OPTION 2
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#define EXIT_FAIL_XDP 3
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#define EXIT_FAIL_BPF 4
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#define EXIT_FAIL_MEM 5
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static const struct option long_options[] = {
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{"help", no_argument, NULL, 'h' },
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{"dev", required_argument, NULL, 'd' },
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{"skb-mode", no_argument, NULL, 'S' },
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{"sec", required_argument, NULL, 's' },
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{"no-separators", no_argument, NULL, 'z' },
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{"action", required_argument, NULL, 'a' },
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{"readmem", no_argument, NULL, 'r' },
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{"swapmac", no_argument, NULL, 'm' },
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{"force", no_argument, NULL, 'F' },
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{0, 0, NULL, 0 }
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};
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static void int_exit(int sig)
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{
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__u32 curr_prog_id = 0;
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if (ifindex > -1) {
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if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
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printf("bpf_get_link_xdp_id failed\n");
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exit(EXIT_FAIL);
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}
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if (prog_id == curr_prog_id) {
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fprintf(stderr,
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"Interrupted: Removing XDP program on ifindex:%d device:%s\n",
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ifindex, ifname);
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bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
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} else if (!curr_prog_id) {
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printf("couldn't find a prog id on a given iface\n");
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} else {
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printf("program on interface changed, not removing\n");
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}
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}
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exit(EXIT_OK);
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}
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struct config {
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__u32 action;
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int ifindex;
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__u32 options;
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};
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enum cfg_options_flags {
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NO_TOUCH = 0x0U,
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READ_MEM = 0x1U,
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SWAP_MAC = 0x2U,
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};
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#define XDP_ACTION_MAX (XDP_TX + 1)
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#define XDP_ACTION_MAX_STRLEN 11
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static const char *xdp_action_names[XDP_ACTION_MAX] = {
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[XDP_ABORTED] = "XDP_ABORTED",
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[XDP_DROP] = "XDP_DROP",
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[XDP_PASS] = "XDP_PASS",
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[XDP_TX] = "XDP_TX",
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};
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static const char *action2str(int action)
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{
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if (action < XDP_ACTION_MAX)
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return xdp_action_names[action];
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return NULL;
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}
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static int parse_xdp_action(char *action_str)
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{
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size_t maxlen;
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__u64 action = -1;
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int i;
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for (i = 0; i < XDP_ACTION_MAX; i++) {
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maxlen = XDP_ACTION_MAX_STRLEN;
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if (strncmp(xdp_action_names[i], action_str, maxlen) == 0) {
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action = i;
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break;
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}
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}
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return action;
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}
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static void list_xdp_actions(void)
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{
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int i;
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printf("Available XDP --action <options>\n");
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for (i = 0; i < XDP_ACTION_MAX; i++)
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printf("\t%s\n", xdp_action_names[i]);
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printf("\n");
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}
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static char* options2str(enum cfg_options_flags flag)
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{
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if (flag == NO_TOUCH)
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return "no_touch";
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if (flag & SWAP_MAC)
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return "swapmac";
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if (flag & READ_MEM)
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return "read";
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fprintf(stderr, "ERR: Unknown config option flags");
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exit(EXIT_FAIL);
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}
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static void usage(char *argv[])
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{
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int i;
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printf("\nDOCUMENTATION:\n%s\n", __doc__);
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printf(" Usage: %s (options-see-below)\n", argv[0]);
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printf(" Listing options:\n");
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for (i = 0; long_options[i].name != 0; i++) {
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printf(" --%-12s", long_options[i].name);
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if (long_options[i].flag != NULL)
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printf(" flag (internal value:%d)",
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*long_options[i].flag);
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else
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printf(" short-option: -%c",
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long_options[i].val);
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printf("\n");
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}
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printf("\n");
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list_xdp_actions();
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}
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#define NANOSEC_PER_SEC 1000000000 /* 10^9 */
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static __u64 gettime(void)
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{
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struct timespec t;
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int res;
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res = clock_gettime(CLOCK_MONOTONIC, &t);
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if (res < 0) {
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fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
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exit(EXIT_FAIL);
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}
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return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
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}
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/* Common stats data record shared with _kern.c */
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struct datarec {
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__u64 processed;
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__u64 issue;
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};
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struct record {
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__u64 timestamp;
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struct datarec total;
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struct datarec *cpu;
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};
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struct stats_record {
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struct record stats;
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struct record *rxq;
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};
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static struct datarec *alloc_record_per_cpu(void)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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struct datarec *array;
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array = calloc(nr_cpus, sizeof(struct datarec));
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if (!array) {
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fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
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exit(EXIT_FAIL_MEM);
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}
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return array;
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}
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static struct record *alloc_record_per_rxq(void)
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{
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unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
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struct record *array;
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array = calloc(nr_rxqs, sizeof(struct record));
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if (!array) {
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fprintf(stderr, "Mem alloc error (nr_rxqs:%u)\n", nr_rxqs);
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exit(EXIT_FAIL_MEM);
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}
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return array;
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}
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static struct stats_record *alloc_stats_record(void)
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{
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unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
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struct stats_record *rec;
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int i;
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rec = calloc(1, sizeof(struct stats_record));
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if (!rec) {
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fprintf(stderr, "Mem alloc error\n");
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exit(EXIT_FAIL_MEM);
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}
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rec->rxq = alloc_record_per_rxq();
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for (i = 0; i < nr_rxqs; i++)
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rec->rxq[i].cpu = alloc_record_per_cpu();
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rec->stats.cpu = alloc_record_per_cpu();
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return rec;
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}
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static void free_stats_record(struct stats_record *r)
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{
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unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
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int i;
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for (i = 0; i < nr_rxqs; i++)
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free(r->rxq[i].cpu);
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free(r->rxq);
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free(r->stats.cpu);
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free(r);
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}
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static bool map_collect_percpu(int fd, __u32 key, struct record *rec)
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{
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/* For percpu maps, userspace gets a value per possible CPU */
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unsigned int nr_cpus = bpf_num_possible_cpus();
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struct datarec values[nr_cpus];
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__u64 sum_processed = 0;
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__u64 sum_issue = 0;
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int i;
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if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
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fprintf(stderr,
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"ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
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return false;
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}
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/* Get time as close as possible to reading map contents */
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rec->timestamp = gettime();
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/* Record and sum values from each CPU */
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for (i = 0; i < nr_cpus; i++) {
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rec->cpu[i].processed = values[i].processed;
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sum_processed += values[i].processed;
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rec->cpu[i].issue = values[i].issue;
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sum_issue += values[i].issue;
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}
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rec->total.processed = sum_processed;
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rec->total.issue = sum_issue;
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return true;
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}
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static void stats_collect(struct stats_record *rec)
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{
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int fd, i, max_rxqs;
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fd = bpf_map__fd(stats_global_map);
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map_collect_percpu(fd, 0, &rec->stats);
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fd = bpf_map__fd(rx_queue_index_map);
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max_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
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for (i = 0; i < max_rxqs; i++)
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map_collect_percpu(fd, i, &rec->rxq[i]);
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}
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static double calc_period(struct record *r, struct record *p)
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{
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double period_ = 0;
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__u64 period = 0;
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period = r->timestamp - p->timestamp;
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if (period > 0)
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period_ = ((double) period / NANOSEC_PER_SEC);
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return period_;
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}
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static __u64 calc_pps(struct datarec *r, struct datarec *p, double period_)
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{
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__u64 packets = 0;
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__u64 pps = 0;
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if (period_ > 0) {
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packets = r->processed - p->processed;
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pps = packets / period_;
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}
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return pps;
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}
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static __u64 calc_errs_pps(struct datarec *r,
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struct datarec *p, double period_)
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{
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__u64 packets = 0;
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__u64 pps = 0;
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if (period_ > 0) {
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packets = r->issue - p->issue;
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pps = packets / period_;
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}
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return pps;
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}
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static void stats_print(struct stats_record *stats_rec,
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struct stats_record *stats_prev,
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int action, __u32 cfg_opt)
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{
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unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
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unsigned int nr_cpus = bpf_num_possible_cpus();
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double pps = 0, err = 0;
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struct record *rec, *prev;
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double t;
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int rxq;
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int i;
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/* Header */
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printf("\nRunning XDP on dev:%s (ifindex:%d) action:%s options:%s\n",
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ifname, ifindex, action2str(action), options2str(cfg_opt));
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/* stats_global_map */
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{
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char *fmt_rx = "%-15s %-7d %'-11.0f %'-10.0f %s\n";
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char *fm2_rx = "%-15s %-7s %'-11.0f\n";
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char *errstr = "";
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printf("%-15s %-7s %-11s %-11s\n",
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"XDP stats", "CPU", "pps", "issue-pps");
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rec = &stats_rec->stats;
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prev = &stats_prev->stats;
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t = calc_period(rec, prev);
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for (i = 0; i < nr_cpus; i++) {
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struct datarec *r = &rec->cpu[i];
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struct datarec *p = &prev->cpu[i];
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pps = calc_pps (r, p, t);
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err = calc_errs_pps(r, p, t);
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if (err > 0)
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errstr = "invalid-ifindex";
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if (pps > 0)
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printf(fmt_rx, "XDP-RX CPU",
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i, pps, err, errstr);
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}
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pps = calc_pps (&rec->total, &prev->total, t);
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err = calc_errs_pps(&rec->total, &prev->total, t);
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printf(fm2_rx, "XDP-RX CPU", "total", pps, err);
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}
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/* rx_queue_index_map */
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printf("\n%-15s %-7s %-11s %-11s\n",
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"RXQ stats", "RXQ:CPU", "pps", "issue-pps");
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for (rxq = 0; rxq < nr_rxqs; rxq++) {
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char *fmt_rx = "%-15s %3d:%-3d %'-11.0f %'-10.0f %s\n";
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char *fm2_rx = "%-15s %3d:%-3s %'-11.0f\n";
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char *errstr = "";
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int rxq_ = rxq;
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/* Last RXQ in map catch overflows */
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if (rxq_ == nr_rxqs - 1)
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rxq_ = -1;
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rec = &stats_rec->rxq[rxq];
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prev = &stats_prev->rxq[rxq];
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t = calc_period(rec, prev);
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for (i = 0; i < nr_cpus; i++) {
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struct datarec *r = &rec->cpu[i];
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struct datarec *p = &prev->cpu[i];
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pps = calc_pps (r, p, t);
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err = calc_errs_pps(r, p, t);
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if (err > 0) {
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if (rxq_ == -1)
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errstr = "map-overflow-RXQ";
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else
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errstr = "err";
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}
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if (pps > 0)
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printf(fmt_rx, "rx_queue_index",
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rxq_, i, pps, err, errstr);
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}
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pps = calc_pps (&rec->total, &prev->total, t);
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err = calc_errs_pps(&rec->total, &prev->total, t);
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if (pps || err)
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printf(fm2_rx, "rx_queue_index", rxq_, "sum", pps, err);
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}
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}
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/* Pointer swap trick */
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static inline void swap(struct stats_record **a, struct stats_record **b)
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{
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struct stats_record *tmp;
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tmp = *a;
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*a = *b;
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*b = tmp;
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}
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static void stats_poll(int interval, int action, __u32 cfg_opt)
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{
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struct stats_record *record, *prev;
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record = alloc_stats_record();
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prev = alloc_stats_record();
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stats_collect(record);
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while (1) {
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swap(&prev, &record);
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stats_collect(record);
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stats_print(record, prev, action, cfg_opt);
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sleep(interval);
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}
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free_stats_record(record);
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free_stats_record(prev);
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}
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int main(int argc, char **argv)
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{
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__u32 cfg_options= NO_TOUCH ; /* Default: Don't touch packet memory */
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struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_XDP,
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};
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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int prog_fd, map_fd, opt, err;
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bool use_separators = true;
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struct config cfg = { 0 };
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struct bpf_object *obj;
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struct bpf_map *map;
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char filename[256];
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int longindex = 0;
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int interval = 2;
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__u32 key = 0;
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char action_str_buf[XDP_ACTION_MAX_STRLEN + 1 /* for \0 */] = { 0 };
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int action = XDP_PASS; /* Default action */
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char *action_str = NULL;
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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prog_load_attr.file = filename;
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if (setrlimit(RLIMIT_MEMLOCK, &r)) {
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perror("setrlimit(RLIMIT_MEMLOCK)");
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return 1;
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}
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if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
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return EXIT_FAIL;
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map = bpf_object__find_map_by_name(obj, "config_map");
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stats_global_map = bpf_object__find_map_by_name(obj, "stats_global_map");
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rx_queue_index_map = bpf_object__find_map_by_name(obj, "rx_queue_index_map");
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if (!map || !stats_global_map || !rx_queue_index_map) {
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printf("finding a map in obj file failed\n");
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return EXIT_FAIL;
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}
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map_fd = bpf_map__fd(map);
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if (!prog_fd) {
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fprintf(stderr, "ERR: load_bpf_file: %s\n", strerror(errno));
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return EXIT_FAIL;
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}
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/* Parse commands line args */
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while ((opt = getopt_long(argc, argv, "FhSrmzd:s:a:",
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long_options, &longindex)) != -1) {
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switch (opt) {
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case 'd':
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if (strlen(optarg) >= IF_NAMESIZE) {
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fprintf(stderr, "ERR: --dev name too long\n");
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goto error;
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}
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ifname = (char *)&ifname_buf;
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strncpy(ifname, optarg, IF_NAMESIZE);
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ifindex = if_nametoindex(ifname);
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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;
|
|
}
|
|
}
|
|
/* 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_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
|
|
fprintf(stderr, "link set xdp fd failed\n");
|
|
return EXIT_FAIL_XDP;
|
|
}
|
|
|
|
err = bpf_obj_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;
|
|
}
|