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-rw-r--r--samples/bpf/xdp_redirect_cpu_user.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
new file mode 100644
index 000000000..a12381c37
--- /dev/null
+++ b/samples/bpf/xdp_redirect_cpu_user.c
@@ -0,0 +1,559 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc.
+ */
+static const char *__doc__ =
+"XDP CPU redirect tool, using BPF_MAP_TYPE_CPUMAP\n"
+"Usage: xdp_redirect_cpu -d <IFINDEX|IFNAME> -c 0 ... -c N\n"
+"Valid specification for CPUMAP BPF program:\n"
+" --mprog-name/-e pass (use built-in XDP_PASS program)\n"
+" --mprog-name/-e drop (use built-in XDP_DROP program)\n"
+" --redirect-device/-r <ifindex|ifname> (use built-in DEVMAP redirect program)\n"
+" Custom CPUMAP BPF program:\n"
+" --mprog-filename/-f <filename> --mprog-name/-e <program>\n"
+" Optionally, also pass --redirect-map/-m and --redirect-device/-r together\n"
+" to configure DEVMAP in BPF object <filename>\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 <sys/sysinfo.h>
+#include <getopt.h>
+#include <net/if.h>
+#include <time.h>
+#include <linux/limits.h>
+#include <arpa/inet.h>
+#include <linux/if_link.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+#include "bpf_util.h"
+#include "xdp_sample_user.h"
+#include "xdp_redirect_cpu.skel.h"
+
+static int map_fd;
+static int avail_fd;
+static int count_fd;
+
+static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
+ SAMPLE_CPUMAP_ENQUEUE_CNT | SAMPLE_CPUMAP_KTHREAD_CNT |
+ SAMPLE_EXCEPTION_CNT;
+
+DEFINE_SAMPLE_INIT(xdp_redirect_cpu);
+
+static const struct option long_options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "dev", required_argument, NULL, 'd' },
+ { "skb-mode", no_argument, NULL, 'S' },
+ { "progname", required_argument, NULL, 'p' },
+ { "qsize", required_argument, NULL, 'q' },
+ { "cpu", required_argument, NULL, 'c' },
+ { "stress-mode", no_argument, NULL, 'x' },
+ { "force", no_argument, NULL, 'F' },
+ { "interval", required_argument, NULL, 'i' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "stats", no_argument, NULL, 's' },
+ { "mprog-name", required_argument, NULL, 'e' },
+ { "mprog-filename", required_argument, NULL, 'f' },
+ { "redirect-device", required_argument, NULL, 'r' },
+ { "redirect-map", required_argument, NULL, 'm' },
+ {}
+};
+
+static void print_avail_progs(struct bpf_object *obj)
+{
+ struct bpf_program *pos;
+
+ printf(" Programs to be used for -p/--progname:\n");
+ bpf_object__for_each_program(pos, obj) {
+ if (bpf_program__type(pos) == BPF_PROG_TYPE_XDP) {
+ if (!strncmp(bpf_program__name(pos), "xdp_prognum",
+ sizeof("xdp_prognum") - 1))
+ printf(" %s\n", bpf_program__name(pos));
+ }
+ }
+}
+
+static void usage(char *argv[], const struct option *long_options,
+ const char *doc, int mask, bool error, struct bpf_object *obj)
+{
+ sample_usage(argv, long_options, doc, mask, error);
+ print_avail_progs(obj);
+}
+
+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_fd, &cpu, value, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Create CPU entry failed: %s\n", strerror(errno));
+ return ret;
+ }
+
+ /* Inform bpf_prog's that a new CPU is available to select
+ * from via some control maps.
+ */
+ ret = bpf_map_update_elem(avail_fd, &avail_idx, &cpu, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Add to avail CPUs failed: %s\n", strerror(errno));
+ return ret;
+ }
+
+ /* When not replacing/updating existing entry, bump the count */
+ ret = bpf_map_lookup_elem(count_fd, &key, &curr_cpus_count);
+ if (ret < 0) {
+ fprintf(stderr, "Failed reading curr cpus_count: %s\n",
+ strerror(errno));
+ return ret;
+ }
+ if (new) {
+ curr_cpus_count++;
+ ret = bpf_map_update_elem(count_fd, &key,
+ &curr_cpus_count, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Failed write curr cpus_count: %s\n",
+ strerror(errno));
+ return ret;
+ }
+ }
+
+ printf("%s CPU: %u as idx: %u qsize: %d cpumap_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 int mark_cpus_unavailable(void)
+{
+ int ret, i, n_cpus = libbpf_num_possible_cpus();
+ __u32 invalid_cpu = n_cpus;
+
+ for (i = 0; i < n_cpus; i++) {
+ ret = bpf_map_update_elem(avail_fd, &i,
+ &invalid_cpu, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Failed marking CPU unavailable: %s\n",
+ strerror(errno));
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/* Stress cpumap management code by concurrently changing underlying cpumap */
+static void stress_cpumap(void *ctx)
+{
+ struct bpf_cpumap_val *value = ctx;
+
+ /* 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 int set_cpumap_prog(struct xdp_redirect_cpu *skel,
+ const char *redir_interface, const char *redir_map,
+ const char *mprog_filename, const char *mprog_name)
+{
+ if (mprog_filename) {
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ int ret;
+
+ if (!mprog_name) {
+ fprintf(stderr, "BPF program not specified for file %s\n",
+ mprog_filename);
+ goto end;
+ }
+ if ((redir_interface && !redir_map) || (!redir_interface && redir_map)) {
+ fprintf(stderr, "--redirect-%s specified but --redirect-%s not specified\n",
+ redir_interface ? "device" : "map", redir_interface ? "map" : "device");
+ goto end;
+ }
+
+ /* Custom BPF program */
+ obj = bpf_object__open_file(mprog_filename, NULL);
+ if (!obj) {
+ ret = -errno;
+ fprintf(stderr, "Failed to bpf_prog_load_xattr: %s\n",
+ strerror(errno));
+ return ret;
+ }
+
+ ret = bpf_object__load(obj);
+ if (ret < 0) {
+ ret = -errno;
+ fprintf(stderr, "Failed to bpf_object__load: %s\n",
+ strerror(errno));
+ return ret;
+ }
+
+ if (redir_map) {
+ int err, redir_map_fd, ifindex_out, key = 0;
+
+ redir_map_fd = bpf_object__find_map_fd_by_name(obj, redir_map);
+ if (redir_map_fd < 0) {
+ fprintf(stderr, "Failed to bpf_object__find_map_fd_by_name: %s\n",
+ strerror(errno));
+ return redir_map_fd;
+ }
+
+ ifindex_out = if_nametoindex(redir_interface);
+ if (!ifindex_out)
+ ifindex_out = strtoul(redir_interface, NULL, 0);
+ if (!ifindex_out) {
+ fprintf(stderr, "Bad interface name or index\n");
+ return -EINVAL;
+ }
+
+ err = bpf_map_update_elem(redir_map_fd, &key, &ifindex_out, 0);
+ if (err < 0)
+ return err;
+ }
+
+ prog = bpf_object__find_program_by_name(obj, mprog_name);
+ if (!prog) {
+ ret = -errno;
+ fprintf(stderr, "Failed to bpf_object__find_program_by_name: %s\n",
+ strerror(errno));
+ return ret;
+ }
+
+ return bpf_program__fd(prog);
+ } else {
+ if (mprog_name) {
+ if (redir_interface || redir_map) {
+ fprintf(stderr, "Need to specify --mprog-filename/-f\n");
+ goto end;
+ }
+ if (!strcmp(mprog_name, "pass") || !strcmp(mprog_name, "drop")) {
+ /* Use built-in pass/drop programs */
+ return *mprog_name == 'p' ? bpf_program__fd(skel->progs.xdp_redirect_cpu_pass)
+ : bpf_program__fd(skel->progs.xdp_redirect_cpu_drop);
+ } else {
+ fprintf(stderr, "Unknown name \"%s\" for built-in BPF program\n",
+ mprog_name);
+ goto end;
+ }
+ } else {
+ if (redir_map) {
+ fprintf(stderr, "Need to specify --mprog-filename, --mprog-name and"
+ " --redirect-device with --redirect-map\n");
+ goto end;
+ }
+ if (redir_interface) {
+ /* Use built-in devmap redirect */
+ struct bpf_devmap_val val = {};
+ int ifindex_out, err;
+ __u32 key = 0;
+
+ if (!redir_interface)
+ return 0;
+
+ ifindex_out = if_nametoindex(redir_interface);
+ if (!ifindex_out)
+ ifindex_out = strtoul(redir_interface, NULL, 0);
+ if (!ifindex_out) {
+ fprintf(stderr, "Bad interface name or index\n");
+ return -EINVAL;
+ }
+
+ if (get_mac_addr(ifindex_out, skel->bss->tx_mac_addr) < 0) {
+ printf("Get interface %d mac failed\n", ifindex_out);
+ return -EINVAL;
+ }
+
+ val.ifindex = ifindex_out;
+ val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_redirect_egress_prog);
+ err = bpf_map_update_elem(bpf_map__fd(skel->maps.tx_port), &key, &val, 0);
+ if (err < 0)
+ return -errno;
+
+ return bpf_program__fd(skel->progs.xdp_redirect_cpu_devmap);
+ }
+ }
+ }
+
+ /* Disabled */
+ return 0;
+end:
+ fprintf(stderr, "Invalid options for CPUMAP BPF program\n");
+ return -EINVAL;
+}
+
+int main(int argc, char **argv)
+{
+ const char *redir_interface = NULL, *redir_map = NULL;
+ const char *mprog_filename = NULL, *mprog_name = NULL;
+ struct xdp_redirect_cpu *skel;
+ struct bpf_map_info info = {};
+ struct bpf_cpumap_val value;
+ __u32 infosz = sizeof(info);
+ int ret = EXIT_FAIL_OPTION;
+ unsigned long interval = 2;
+ bool stress_mode = false;
+ struct bpf_program *prog;
+ const char *prog_name;
+ bool generic = false;
+ bool force = false;
+ int added_cpus = 0;
+ bool error = true;
+ int longindex = 0;
+ int add_cpu = -1;
+ int ifindex = -1;
+ int *cpu, i, opt;
+ __u32 qsize;
+ int n_cpus;
+
+ n_cpus = libbpf_num_possible_cpus();
+
+ /* Notice: Choosing the queue size is very important when CPU is
+ * configured with power-saving states.
+ *
+ * If deepest state take 133 usec to wakeup from (133/10^6). When link
+ * speed is 10Gbit/s ((10*10^9/8) in bytes/sec). How many bytes can
+ * arrive with in 133 usec at this speed: (10*10^9/8)*(133/10^6) =
+ * 166250 bytes. With MTU size packets this is 110 packets, and with
+ * minimum Ethernet (MAC-preamble + intergap) 84 bytes is 1979 packets.
+ *
+ * Setting default cpumap queue to 2048 as worst-case (small packet)
+ * should be +64 packet due kthread wakeup call (due to xdp_do_flush)
+ * worst-case is 2043 packets.
+ *
+ * Sysadm can configured system to avoid deep-sleep via:
+ * tuned-adm profile network-latency
+ */
+ qsize = 2048;
+
+ skel = xdp_redirect_cpu__open();
+ if (!skel) {
+ fprintf(stderr, "Failed to xdp_redirect_cpu__open: %s\n",
+ strerror(errno));
+ ret = EXIT_FAIL_BPF;
+ goto end;
+ }
+
+ ret = sample_init_pre_load(skel);
+ if (ret < 0) {
+ fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
+ ret = EXIT_FAIL_BPF;
+ goto end_destroy;
+ }
+
+ if (bpf_map__set_max_entries(skel->maps.cpu_map, n_cpus) < 0) {
+ fprintf(stderr, "Failed to set max entries for cpu_map map: %s",
+ strerror(errno));
+ ret = EXIT_FAIL_BPF;
+ goto end_destroy;
+ }
+
+ if (bpf_map__set_max_entries(skel->maps.cpus_available, n_cpus) < 0) {
+ fprintf(stderr, "Failed to set max entries for cpus_available map: %s",
+ strerror(errno));
+ ret = EXIT_FAIL_BPF;
+ goto end_destroy;
+ }
+
+ cpu = calloc(n_cpus, sizeof(int));
+ if (!cpu) {
+ fprintf(stderr, "Failed to allocate cpu array\n");
+ goto end_destroy;
+ }
+
+ prog = skel->progs.xdp_prognum5_lb_hash_ip_pairs;
+ while ((opt = getopt_long(argc, argv, "d:si:Sxp:f:e:r:m:c:q:Fvh",
+ long_options, &longindex)) != -1) {
+ switch (opt) {
+ case 'd':
+ if (strlen(optarg) >= IF_NAMESIZE) {
+ fprintf(stderr, "-d/--dev name too long\n");
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+ ifindex = if_nametoindex(optarg);
+ if (!ifindex)
+ ifindex = strtoul(optarg, NULL, 0);
+ if (!ifindex) {
+ fprintf(stderr, "Bad interface index or name (%d): %s\n",
+ errno, strerror(errno));
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+ break;
+ case 's':
+ mask |= SAMPLE_REDIRECT_MAP_CNT;
+ break;
+ case 'i':
+ interval = strtoul(optarg, NULL, 0);
+ break;
+ case 'S':
+ generic = true;
+ break;
+ case 'x':
+ stress_mode = true;
+ break;
+ case 'p':
+ /* Selecting eBPF prog to load */
+ prog_name = optarg;
+ prog = bpf_object__find_program_by_name(skel->obj,
+ prog_name);
+ if (!prog) {
+ fprintf(stderr,
+ "Failed to find program %s specified by"
+ " option -p/--progname\n",
+ prog_name);
+ print_avail_progs(skel->obj);
+ goto end_cpu;
+ }
+ break;
+ case 'f':
+ mprog_filename = optarg;
+ break;
+ case 'e':
+ mprog_name = optarg;
+ break;
+ case 'r':
+ redir_interface = optarg;
+ mask |= SAMPLE_DEVMAP_XMIT_CNT_MULTI;
+ 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));
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+ cpu[added_cpus++] = add_cpu;
+ break;
+ case 'q':
+ qsize = strtoul(optarg, NULL, 0);
+ break;
+ case 'F':
+ force = true;
+ break;
+ case 'v':
+ sample_switch_mode();
+ break;
+ case 'h':
+ error = false;
+ default:
+ usage(argv, long_options, __doc__, mask, error, skel->obj);
+ goto end_cpu;
+ }
+ }
+
+ ret = EXIT_FAIL_OPTION;
+ if (ifindex == -1) {
+ fprintf(stderr, "Required option --dev missing\n");
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+
+ if (add_cpu == -1) {
+ fprintf(stderr, "Required option --cpu missing\n"
+ "Specify multiple --cpu option to add more\n");
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+
+ skel->rodata->from_match[0] = ifindex;
+ if (redir_interface)
+ skel->rodata->to_match[0] = if_nametoindex(redir_interface);
+
+ ret = xdp_redirect_cpu__load(skel);
+ if (ret < 0) {
+ fprintf(stderr, "Failed to xdp_redirect_cpu__load: %s\n",
+ strerror(errno));
+ goto end_cpu;
+ }
+
+ ret = bpf_obj_get_info_by_fd(bpf_map__fd(skel->maps.cpu_map), &info, &infosz);
+ if (ret < 0) {
+ fprintf(stderr, "Failed bpf_obj_get_info_by_fd for cpumap: %s\n",
+ strerror(errno));
+ goto end_cpu;
+ }
+
+ skel->bss->cpumap_map_id = info.id;
+
+ map_fd = bpf_map__fd(skel->maps.cpu_map);
+ avail_fd = bpf_map__fd(skel->maps.cpus_available);
+ count_fd = bpf_map__fd(skel->maps.cpus_count);
+
+ ret = mark_cpus_unavailable();
+ if (ret < 0) {
+ fprintf(stderr, "Unable to mark CPUs as unavailable\n");
+ goto end_cpu;
+ }
+
+ ret = sample_init(skel, mask);
+ if (ret < 0) {
+ fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
+ ret = EXIT_FAIL;
+ goto end_cpu;
+ }
+
+ value.bpf_prog.fd = set_cpumap_prog(skel, redir_interface, redir_map,
+ mprog_filename, mprog_name);
+ if (value.bpf_prog.fd < 0) {
+ fprintf(stderr, "Failed to set CPUMAP BPF program: %s\n",
+ strerror(-value.bpf_prog.fd));
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ ret = EXIT_FAIL_BPF;
+ goto end_cpu;
+ }
+ value.qsize = qsize;
+
+ for (i = 0; i < added_cpus; i++) {
+ if (create_cpu_entry(cpu[i], &value, i, true) < 0) {
+ fprintf(stderr, "Cannot proceed, exiting\n");
+ usage(argv, long_options, __doc__, mask, true, skel->obj);
+ goto end_cpu;
+ }
+ }
+
+ ret = EXIT_FAIL_XDP;
+ if (sample_install_xdp(prog, ifindex, generic, force) < 0)
+ goto end_cpu;
+
+ ret = sample_run(interval, stress_mode ? stress_cpumap : NULL, &value);
+ if (ret < 0) {
+ fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
+ ret = EXIT_FAIL;
+ goto end_cpu;
+ }
+ ret = EXIT_OK;
+end_cpu:
+ free(cpu);
+end_destroy:
+ xdp_redirect_cpu__destroy(skel);
+end:
+ sample_exit(ret);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-21 05:53:18 +0000