// SPDX-License-Identifier: GPL-2.0-only
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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__ =
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" XDP redirect with a CPU-map type \"BPF_MAP_TYPE_CPUMAP\"";
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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 <sys/sysinfo.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 <linux/limits.h>
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#include <arpa/inet.h>
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#include <linux/if_link.h>
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/* How many xdp_progs are defined in _kern.c */
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#define MAX_PROG 6
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#include <bpf/bpf.h>
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#include <bpf/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 int n_cpus;
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enum map_type {
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CPU_MAP,
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RX_CNT,
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REDIRECT_ERR_CNT,
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CPUMAP_ENQUEUE_CNT,
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CPUMAP_KTHREAD_CNT,
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CPUS_AVAILABLE,
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CPUS_COUNT,
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CPUS_ITERATOR,
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EXCEPTION_CNT,
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};
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static const char *const map_type_strings[] = {
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[CPU_MAP] = "cpu_map",
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[RX_CNT] = "rx_cnt",
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[REDIRECT_ERR_CNT] = "redirect_err_cnt",
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[CPUMAP_ENQUEUE_CNT] = "cpumap_enqueue_cnt",
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[CPUMAP_KTHREAD_CNT] = "cpumap_kthread_cnt",
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[CPUS_AVAILABLE] = "cpus_available",
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[CPUS_COUNT] = "cpus_count",
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[CPUS_ITERATOR] = "cpus_iterator",
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[EXCEPTION_CNT] = "exception_cnt",
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};
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#define NUM_TP 5
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#define NUM_MAP 9
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struct bpf_link *tp_links[NUM_TP] = {};
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static int map_fds[NUM_MAP];
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static int tp_cnt = 0;
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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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{"progname", required_argument, NULL, 'p' },
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{"qsize", required_argument, NULL, 'q' },
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{"cpu", required_argument, NULL, 'c' },
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{"stress-mode", no_argument, NULL, 'x' },
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{"no-separators", no_argument, NULL, 'z' },
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{"force", no_argument, NULL, 'F' },
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{"mprog-disable", no_argument, NULL, 'n' },
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{"mprog-name", required_argument, NULL, 'e' },
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{"mprog-filename", required_argument, NULL, 'f' },
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{"redirect-device", required_argument, NULL, 'r' },
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{"redirect-map", required_argument, NULL, 'm' },
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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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/* Detach tracepoints */
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while (tp_cnt)
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bpf_link__destroy(tp_links[--tp_cnt]);
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exit(EXIT_OK);
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}
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static void print_avail_progs(struct bpf_object *obj)
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{
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struct bpf_program *pos;
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bpf_object__for_each_program(pos, obj) {
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if (bpf_program__is_xdp(pos))
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printf(" %s\n", bpf_program__section_name(pos));
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}
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}
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static void usage(char *argv[], struct bpf_object *obj)
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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("\n");
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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 Programs to be used for --progname:\n");
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print_avail_progs(obj);
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printf("\n");
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}
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/* gettime returns the current time of day in nanoseconds.
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* Cost: clock_gettime (ns) => 26ns (CLOCK_MONOTONIC)
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* clock_gettime (ns) => 9ns (CLOCK_MONOTONIC_COARSE)
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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 dropped;
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__u64 issue;
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__u64 xdp_pass;
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__u64 xdp_drop;
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__u64 xdp_redirect;
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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 rx_cnt;
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struct record redir_err;
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struct record kthread;
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struct record exception;
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struct record enq[];
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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_xdp_redirect = 0;
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__u64 sum_xdp_pass = 0;
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__u64 sum_xdp_drop = 0;
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__u64 sum_processed = 0;
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__u64 sum_dropped = 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].dropped = values[i].dropped;
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sum_dropped += values[i].dropped;
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rec->cpu[i].issue = values[i].issue;
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sum_issue += values[i].issue;
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rec->cpu[i].xdp_pass = values[i].xdp_pass;
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sum_xdp_pass += values[i].xdp_pass;
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rec->cpu[i].xdp_drop = values[i].xdp_drop;
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sum_xdp_drop += values[i].xdp_drop;
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rec->cpu[i].xdp_redirect = values[i].xdp_redirect;
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sum_xdp_redirect += values[i].xdp_redirect;
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}
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rec->total.processed = sum_processed;
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rec->total.dropped = sum_dropped;
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rec->total.issue = sum_issue;
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rec->total.xdp_pass = sum_xdp_pass;
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rec->total.xdp_drop = sum_xdp_drop;
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rec->total.xdp_redirect = sum_xdp_redirect;
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return true;
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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 stats_record *alloc_stats_record(void)
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{
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struct stats_record *rec;
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int i, size;
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size = sizeof(*rec) + n_cpus * sizeof(struct record);
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rec = malloc(size);
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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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memset(rec, 0, size);
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rec->rx_cnt.cpu = alloc_record_per_cpu();
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rec->redir_err.cpu = alloc_record_per_cpu();
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rec->kthread.cpu = alloc_record_per_cpu();
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rec->exception.cpu = alloc_record_per_cpu();
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for (i = 0; i < n_cpus; i++)
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rec->enq[i].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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int i;
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for (i = 0; i < n_cpus; i++)
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free(r->enq[i].cpu);
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free(r->exception.cpu);
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free(r->kthread.cpu);
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free(r->redir_err.cpu);
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free(r->rx_cnt.cpu);
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free(r);
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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_drop_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->dropped - p->dropped;
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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 calc_xdp_pps(struct datarec *r, struct datarec *p,
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double *xdp_pass, double *xdp_drop,
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double *xdp_redirect, double period_)
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{
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*xdp_pass = 0, *xdp_drop = 0, *xdp_redirect = 0;
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if (period_ > 0) {
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*xdp_redirect = (r->xdp_redirect - p->xdp_redirect) / period_;
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*xdp_pass = (r->xdp_pass - p->xdp_pass) / period_;
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*xdp_drop = (r->xdp_drop - p->xdp_drop) / period_;
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}
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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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char *prog_name, char *mprog_name, int mprog_fd)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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double pps = 0, drop = 0, err = 0;
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bool mprog_enabled = false;
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struct record *rec, *prev;
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int to_cpu;
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double t;
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int i;
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if (mprog_fd > 0)
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mprog_enabled = true;
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/* Header */
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printf("Running XDP/eBPF prog_name:%s\n", prog_name);
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printf("%-15s %-7s %-14s %-11s %-9s\n",
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"XDP-cpumap", "CPU:to", "pps", "drop-pps", "extra-info");
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/* XDP rx_cnt */
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{
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char *fmt_rx = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f %s\n";
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char *fm2_rx = "%-15s %-7s %'-14.0f %'-11.0f\n";
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char *errstr = "";
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rec = &stats_rec->rx_cnt;
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prev = &stats_prev->rx_cnt;
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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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drop = calc_drop_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 = "cpu-dest/err";
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if (pps > 0)
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printf(fmt_rx, "XDP-RX",
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i, pps, drop, err, errstr);
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}
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pps = calc_pps(&rec->total, &prev->total, t);
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drop = calc_drop_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", "total", pps, drop);
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}
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/* cpumap enqueue stats */
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for (to_cpu = 0; to_cpu < n_cpus; to_cpu++) {
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char *fmt = "%-15s %3d:%-3d %'-14.0f %'-11.0f %'-10.2f %s\n";
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char *fm2 = "%-15s %3s:%-3d %'-14.0f %'-11.0f %'-10.2f %s\n";
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char *errstr = "";
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rec = &stats_rec->enq[to_cpu];
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prev = &stats_prev->enq[to_cpu];
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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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drop = calc_drop_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 = "bulk-average";
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err = pps / err; /* calc average bulk size */
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}
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if (pps > 0)
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printf(fmt, "cpumap-enqueue",
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i, to_cpu, pps, drop, err, errstr);
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}
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pps = calc_pps(&rec->total, &prev->total, t);
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if (pps > 0) {
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drop = calc_drop_pps(&rec->total, &prev->total, t);
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err = calc_errs_pps(&rec->total, &prev->total, t);
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if (err > 0) {
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errstr = "bulk-average";
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err = pps / err; /* calc average bulk size */
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}
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printf(fm2, "cpumap-enqueue",
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"sum", to_cpu, pps, drop, err, errstr);
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}
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}
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/* cpumap kthread stats */
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{
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char *fmt_k = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f %s\n";
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char *fm2_k = "%-15s %-7s %'-14.0f %'-11.0f %'-10.0f %s\n";
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char *e_str = "";
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rec = &stats_rec->kthread;
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prev = &stats_prev->kthread;
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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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drop = calc_drop_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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e_str = "sched";
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if (pps > 0)
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printf(fmt_k, "cpumap_kthread",
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i, pps, drop, err, e_str);
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}
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pps = calc_pps(&rec->total, &prev->total, t);
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drop = calc_drop_pps(&rec->total, &prev->total, t);
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err = calc_errs_pps(&rec->total, &prev->total, t);
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if (err > 0)
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e_str = "sched-sum";
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printf(fm2_k, "cpumap_kthread", "total", pps, drop, err, e_str);
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}
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/* XDP redirect err tracepoints (very unlikely) */
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{
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char *fmt_err = "%-15s %-7d %'-14.0f %'-11.0f\n";
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char *fm2_err = "%-15s %-7s %'-14.0f %'-11.0f\n";
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rec = &stats_rec->redir_err;
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prev = &stats_prev->redir_err;
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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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drop = calc_drop_pps(r, p, t);
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if (pps > 0)
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printf(fmt_err, "redirect_err", i, pps, drop);
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}
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pps = calc_pps(&rec->total, &prev->total, t);
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drop = calc_drop_pps(&rec->total, &prev->total, t);
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printf(fm2_err, "redirect_err", "total", pps, drop);
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}
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/* XDP general exception tracepoints */
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{
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char *fmt_err = "%-15s %-7d %'-14.0f %'-11.0f\n";
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char *fm2_err = "%-15s %-7s %'-14.0f %'-11.0f\n";
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rec = &stats_rec->exception;
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prev = &stats_prev->exception;
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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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drop = calc_drop_pps(r, p, t);
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if (pps > 0)
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printf(fmt_err, "xdp_exception", i, pps, drop);
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}
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pps = calc_pps(&rec->total, &prev->total, t);
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drop = calc_drop_pps(&rec->total, &prev->total, t);
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printf(fm2_err, "xdp_exception", "total", pps, drop);
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}
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/* CPUMAP attached XDP program that runs on remote/destination CPU */
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if (mprog_enabled) {
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char *fmt_k = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f\n";
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char *fm2_k = "%-15s %-7s %'-14.0f %'-11.0f %'-10.0f\n";
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double xdp_pass, xdp_drop, xdp_redirect;
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printf("\n2nd remote XDP/eBPF prog_name: %s\n", mprog_name);
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printf("%-15s %-7s %-14s %-11s %-9s\n",
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"XDP-cpumap", "CPU:to", "xdp-pass", "xdp-drop", "xdp-redir");
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rec = &stats_rec->kthread;
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prev = &stats_prev->kthread;
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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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calc_xdp_pps(r, p, &xdp_pass, &xdp_drop,
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&xdp_redirect, t);
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if (xdp_pass > 0 || xdp_drop > 0 || xdp_redirect > 0)
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printf(fmt_k, "xdp-in-kthread", i, xdp_pass, xdp_drop,
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xdp_redirect);
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}
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calc_xdp_pps(&rec->total, &prev->total, &xdp_pass, &xdp_drop,
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&xdp_redirect, t);
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printf(fm2_k, "xdp-in-kthread", "total", xdp_pass, xdp_drop, xdp_redirect);
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}
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printf("\n");
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fflush(stdout);
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}
|
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static void stats_collect(struct stats_record *rec)
|
{
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int fd, i;
|
|
fd = map_fds[RX_CNT];
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map_collect_percpu(fd, 0, &rec->rx_cnt);
|
|
fd = map_fds[REDIRECT_ERR_CNT];
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map_collect_percpu(fd, 1, &rec->redir_err);
|
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fd = map_fds[CPUMAP_ENQUEUE_CNT];
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for (i = 0; i < n_cpus; i++)
|
map_collect_percpu(fd, i, &rec->enq[i]);
|
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fd = map_fds[CPUMAP_KTHREAD_CNT];
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map_collect_percpu(fd, 0, &rec->kthread);
|
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fd = map_fds[EXCEPTION_CNT];
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map_collect_percpu(fd, 0, &rec->exception);
|
}
|
|
|
/* 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 int create_cpu_entry(__u32 cpu, struct bpf_cpumap_val *value,
|
__u32 avail_idx, bool new)
|
{
|
__u32 curr_cpus_count = 0;
|
__u32 key = 0;
|
int ret;
|
|
/* Add a CPU entry to cpumap, as this allocate a cpu entry in
|
* the kernel for the cpu.
|
*/
|
ret = bpf_map_update_elem(map_fds[CPU_MAP], &cpu, value, 0);
|
if (ret) {
|
fprintf(stderr, "Create CPU entry failed (err:%d)\n", ret);
|
exit(EXIT_FAIL_BPF);
|
}
|
|
/* Inform bpf_prog's that a new CPU is available to select
|
* from via some control maps.
|
*/
|
ret = bpf_map_update_elem(map_fds[CPUS_AVAILABLE], &avail_idx, &cpu, 0);
|
if (ret) {
|
fprintf(stderr, "Add to avail CPUs failed\n");
|
exit(EXIT_FAIL_BPF);
|
}
|
|
/* When not replacing/updating existing entry, bump the count */
|
ret = bpf_map_lookup_elem(map_fds[CPUS_COUNT], &key, &curr_cpus_count);
|
if (ret) {
|
fprintf(stderr, "Failed reading curr cpus_count\n");
|
exit(EXIT_FAIL_BPF);
|
}
|
if (new) {
|
curr_cpus_count++;
|
ret = bpf_map_update_elem(map_fds[CPUS_COUNT], &key,
|
&curr_cpus_count, 0);
|
if (ret) {
|
fprintf(stderr, "Failed write curr cpus_count\n");
|
exit(EXIT_FAIL_BPF);
|
}
|
}
|
/* map_fd[7] = cpus_iterator */
|
printf("%s CPU:%u as idx:%u qsize:%d prog_fd: %d (cpus_count:%u)\n",
|
new ? "Add-new":"Replace", cpu, avail_idx,
|
value->qsize, value->bpf_prog.fd, curr_cpus_count);
|
|
return 0;
|
}
|
|
/* CPUs are zero-indexed. Thus, add a special sentinel default value
|
* in map cpus_available to mark CPU index'es not configured
|
*/
|
static void mark_cpus_unavailable(void)
|
{
|
__u32 invalid_cpu = n_cpus;
|
int ret, i;
|
|
for (i = 0; i < n_cpus; i++) {
|
ret = bpf_map_update_elem(map_fds[CPUS_AVAILABLE], &i,
|
&invalid_cpu, 0);
|
if (ret) {
|
fprintf(stderr, "Failed marking CPU unavailable\n");
|
exit(EXIT_FAIL_BPF);
|
}
|
}
|
}
|
|
/* Stress cpumap management code by concurrently changing underlying cpumap */
|
static void stress_cpumap(struct bpf_cpumap_val *value)
|
{
|
/* Changing qsize will cause kernel to free and alloc a new
|
* bpf_cpu_map_entry, with an associated/complicated tear-down
|
* procedure.
|
*/
|
value->qsize = 1024;
|
create_cpu_entry(1, value, 0, false);
|
value->qsize = 8;
|
create_cpu_entry(1, value, 0, false);
|
value->qsize = 16000;
|
create_cpu_entry(1, value, 0, false);
|
}
|
|
static void stats_poll(int interval, bool use_separators, char *prog_name,
|
char *mprog_name, struct bpf_cpumap_val *value,
|
bool stress_mode)
|
{
|
struct stats_record *record, *prev;
|
int mprog_fd;
|
|
record = alloc_stats_record();
|
prev = alloc_stats_record();
|
stats_collect(record);
|
|
/* Trick to pretty printf with thousands separators use %' */
|
if (use_separators)
|
setlocale(LC_NUMERIC, "en_US");
|
|
while (1) {
|
swap(&prev, &record);
|
mprog_fd = value->bpf_prog.fd;
|
stats_collect(record);
|
stats_print(record, prev, prog_name, mprog_name, mprog_fd);
|
sleep(interval);
|
if (stress_mode)
|
stress_cpumap(value);
|
}
|
|
free_stats_record(record);
|
free_stats_record(prev);
|
}
|
|
static int init_tracepoints(struct bpf_object *obj)
|
{
|
struct bpf_program *prog;
|
|
bpf_object__for_each_program(prog, obj) {
|
if (bpf_program__is_tracepoint(prog) != true)
|
continue;
|
|
tp_links[tp_cnt] = bpf_program__attach(prog);
|
if (libbpf_get_error(tp_links[tp_cnt])) {
|
tp_links[tp_cnt] = NULL;
|
return -EINVAL;
|
}
|
tp_cnt++;
|
}
|
|
return 0;
|
}
|
|
static int init_map_fds(struct bpf_object *obj)
|
{
|
enum map_type type;
|
|
for (type = 0; type < NUM_MAP; type++) {
|
map_fds[type] =
|
bpf_object__find_map_fd_by_name(obj,
|
map_type_strings[type]);
|
|
if (map_fds[type] < 0)
|
return -ENOENT;
|
}
|
|
return 0;
|
}
|
|
static int load_cpumap_prog(char *file_name, char *prog_name,
|
char *redir_interface, char *redir_map)
|
{
|
struct bpf_prog_load_attr prog_load_attr = {
|
.prog_type = BPF_PROG_TYPE_XDP,
|
.expected_attach_type = BPF_XDP_CPUMAP,
|
.file = file_name,
|
};
|
struct bpf_program *prog;
|
struct bpf_object *obj;
|
int fd;
|
|
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &fd))
|
return -1;
|
|
if (fd < 0) {
|
fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n",
|
strerror(errno));
|
return fd;
|
}
|
|
if (redir_interface && redir_map) {
|
int err, map_fd, ifindex_out, key = 0;
|
|
map_fd = bpf_object__find_map_fd_by_name(obj, redir_map);
|
if (map_fd < 0)
|
return map_fd;
|
|
ifindex_out = if_nametoindex(redir_interface);
|
if (!ifindex_out)
|
return -1;
|
|
err = bpf_map_update_elem(map_fd, &key, &ifindex_out, 0);
|
if (err < 0)
|
return err;
|
}
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
if (!prog) {
|
fprintf(stderr, "bpf_object__find_program_by_title failed\n");
|
return EXIT_FAIL;
|
}
|
|
return bpf_program__fd(prog);
|
}
|
|
int main(int argc, char **argv)
|
{
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
char *prog_name = "xdp_cpu_map5_lb_hash_ip_pairs";
|
char *mprog_filename = "xdp_redirect_kern.o";
|
char *redir_interface = NULL, *redir_map = NULL;
|
char *mprog_name = "xdp_redirect_dummy";
|
bool mprog_disable = false;
|
struct bpf_prog_load_attr prog_load_attr = {
|
.prog_type = BPF_PROG_TYPE_UNSPEC,
|
};
|
struct bpf_prog_info info = {};
|
__u32 info_len = sizeof(info);
|
struct bpf_cpumap_val value;
|
bool use_separators = true;
|
bool stress_mode = false;
|
struct bpf_program *prog;
|
struct bpf_object *obj;
|
int err = EXIT_FAIL;
|
char filename[256];
|
int added_cpus = 0;
|
int longindex = 0;
|
int interval = 2;
|
int add_cpu = -1;
|
int opt, prog_fd;
|
int *cpu, i;
|
__u32 qsize;
|
|
n_cpus = get_nprocs_conf();
|
|
/* Notice: choosing he queue size is very important with the
|
* ixgbe driver, because it's driver page recycling trick is
|
* dependend on pages being returned quickly. The number of
|
* out-standing packets in the system must be less-than 2x
|
* RX-ring size.
|
*/
|
qsize = 128+64;
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
prog_load_attr.file = filename;
|
|
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
perror("setrlimit(RLIMIT_MEMLOCK)");
|
return 1;
|
}
|
|
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
|
return err;
|
|
if (prog_fd < 0) {
|
fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n",
|
strerror(errno));
|
return err;
|
}
|
|
if (init_tracepoints(obj) < 0) {
|
fprintf(stderr, "ERR: bpf_program__attach failed\n");
|
return err;
|
}
|
|
if (init_map_fds(obj) < 0) {
|
fprintf(stderr, "bpf_object__find_map_fd_by_name failed\n");
|
return err;
|
}
|
mark_cpus_unavailable();
|
|
cpu = malloc(n_cpus * sizeof(int));
|
if (!cpu) {
|
fprintf(stderr, "failed to allocate cpu array\n");
|
return err;
|
}
|
memset(cpu, 0, n_cpus * sizeof(int));
|
|
/* Parse commands line args */
|
while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzFf:e:r:m:n",
|
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 'x':
|
stress_mode = true;
|
break;
|
case 'z':
|
use_separators = false;
|
break;
|
case 'p':
|
/* Selecting eBPF prog to load */
|
prog_name = optarg;
|
break;
|
case 'n':
|
mprog_disable = true;
|
break;
|
case 'f':
|
mprog_filename = optarg;
|
break;
|
case 'e':
|
mprog_name = optarg;
|
break;
|
case 'r':
|
redir_interface = optarg;
|
break;
|
case 'm':
|
redir_map = optarg;
|
break;
|
case 'c':
|
/* Add multiple CPUs */
|
add_cpu = strtoul(optarg, NULL, 0);
|
if (add_cpu >= n_cpus) {
|
fprintf(stderr,
|
"--cpu nr too large for cpumap err(%d):%s\n",
|
errno, strerror(errno));
|
goto error;
|
}
|
cpu[added_cpus++] = add_cpu;
|
break;
|
case 'q':
|
qsize = atoi(optarg);
|
break;
|
case 'F':
|
xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
|
break;
|
case 'h':
|
error:
|
default:
|
free(cpu);
|
usage(argv, obj);
|
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, obj);
|
err = EXIT_FAIL_OPTION;
|
goto out;
|
}
|
/* Required option */
|
if (add_cpu == -1) {
|
fprintf(stderr, "ERR: required option --cpu missing\n");
|
fprintf(stderr, " Specify multiple --cpu option to add more\n");
|
usage(argv, obj);
|
err = EXIT_FAIL_OPTION;
|
goto out;
|
}
|
|
value.bpf_prog.fd = 0;
|
if (!mprog_disable)
|
value.bpf_prog.fd = load_cpumap_prog(mprog_filename, mprog_name,
|
redir_interface, redir_map);
|
if (value.bpf_prog.fd < 0) {
|
err = value.bpf_prog.fd;
|
goto out;
|
}
|
value.qsize = qsize;
|
|
for (i = 0; i < added_cpus; i++)
|
create_cpu_entry(cpu[i], &value, i, true);
|
|
/* Remove XDP program when program is interrupted or killed */
|
signal(SIGINT, int_exit);
|
signal(SIGTERM, int_exit);
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
if (!prog) {
|
fprintf(stderr, "bpf_object__find_program_by_title failed\n");
|
goto out;
|
}
|
|
prog_fd = bpf_program__fd(prog);
|
if (prog_fd < 0) {
|
fprintf(stderr, "bpf_program__fd failed\n");
|
goto out;
|
}
|
|
if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
|
fprintf(stderr, "link set xdp fd failed\n");
|
err = EXIT_FAIL_XDP;
|
goto out;
|
}
|
|
err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
|
if (err) {
|
printf("can't get prog info - %s\n", strerror(errno));
|
goto out;
|
}
|
prog_id = info.id;
|
|
stats_poll(interval, use_separators, prog_name, mprog_name,
|
&value, stress_mode);
|
|
err = EXIT_OK;
|
out:
|
free(cpu);
|
return err;
|
}
|
