samples: bpf: convert some XDP samples from bpf_load to libbpf
Now that we can use full powers of libbpf in BPF samples, we should perhaps make the simplest XDP programs not depend on bpf_load helpers. This way newcomers will be exposed to the recommended library from the start. Use of bpf_prog_load_xattr() will also make it trivial to later on request offload of the programs by simply adding ifindex to the xattr. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski
Daniel Borkmann
parent
17387dd5ac
commit
be5bca44aa
|
|
@ -79,9 +79,9 @@ test_cgrp2_attach-objs := test_cgrp2_attach.o $(LIBBPF)
|
|||
test_cgrp2_attach2-objs := test_cgrp2_attach2.o $(LIBBPF) $(CGROUP_HELPERS)
|
||||
test_cgrp2_sock-objs := test_cgrp2_sock.o $(LIBBPF)
|
||||
test_cgrp2_sock2-objs := bpf_load.o $(LIBBPF) test_cgrp2_sock2.o
|
||||
xdp1-objs := bpf_load.o $(LIBBPF) xdp1_user.o
|
||||
xdp1-objs := xdp1_user.o $(LIBBPF)
|
||||
# reuse xdp1 source intentionally
|
||||
xdp2-objs := bpf_load.o $(LIBBPF) xdp1_user.o
|
||||
xdp2-objs := xdp1_user.o $(LIBBPF)
|
||||
xdp_router_ipv4-objs := bpf_load.o $(LIBBPF) xdp_router_ipv4_user.o
|
||||
test_current_task_under_cgroup-objs := bpf_load.o $(LIBBPF) $(CGROUP_HELPERS) \
|
||||
test_current_task_under_cgroup_user.o
|
||||
|
|
@ -96,10 +96,10 @@ xdp_redirect-objs := bpf_load.o $(LIBBPF) xdp_redirect_user.o
|
|||
xdp_redirect_map-objs := bpf_load.o $(LIBBPF) xdp_redirect_map_user.o
|
||||
xdp_redirect_cpu-objs := bpf_load.o $(LIBBPF) xdp_redirect_cpu_user.o
|
||||
xdp_monitor-objs := bpf_load.o $(LIBBPF) xdp_monitor_user.o
|
||||
xdp_rxq_info-objs := bpf_load.o $(LIBBPF) xdp_rxq_info_user.o
|
||||
xdp_rxq_info-objs := xdp_rxq_info_user.o $(LIBBPF)
|
||||
syscall_tp-objs := bpf_load.o $(LIBBPF) syscall_tp_user.o
|
||||
cpustat-objs := bpf_load.o $(LIBBPF) cpustat_user.o
|
||||
xdp_adjust_tail-objs := bpf_load.o $(LIBBPF) xdp_adjust_tail_user.o
|
||||
xdp_adjust_tail-objs := xdp_adjust_tail_user.o $(LIBBPF)
|
||||
xdpsock-objs := bpf_load.o $(LIBBPF) xdpsock_user.o
|
||||
xdp_fwd-objs := bpf_load.o $(LIBBPF) xdp_fwd_user.o
|
||||
|
||||
|
|
|
|||
|
|
@ -16,9 +16,9 @@
|
|||
#include <libgen.h>
|
||||
#include <sys/resource.h>
|
||||
|
||||
#include "bpf_load.h"
|
||||
#include "bpf_util.h"
|
||||
#include "libbpf.h"
|
||||
#include "bpf/bpf.h"
|
||||
#include "bpf/libbpf.h"
|
||||
|
||||
static int ifindex;
|
||||
static __u32 xdp_flags;
|
||||
|
|
@ -31,7 +31,7 @@ static void int_exit(int sig)
|
|||
|
||||
/* simple per-protocol drop counter
|
||||
*/
|
||||
static void poll_stats(int interval)
|
||||
static void poll_stats(int map_fd, int interval)
|
||||
{
|
||||
unsigned int nr_cpus = bpf_num_possible_cpus();
|
||||
const unsigned int nr_keys = 256;
|
||||
|
|
@ -47,7 +47,7 @@ static void poll_stats(int interval)
|
|||
for (key = 0; key < nr_keys; key++) {
|
||||
__u64 sum = 0;
|
||||
|
||||
assert(bpf_map_lookup_elem(map_fd[0], &key, values) == 0);
|
||||
assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
|
||||
for (i = 0; i < nr_cpus; i++)
|
||||
sum += (values[i] - prev[key][i]);
|
||||
if (sum)
|
||||
|
|
@ -71,9 +71,14 @@ static void usage(const char *prog)
|
|||
int main(int argc, char **argv)
|
||||
{
|
||||
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
||||
struct bpf_prog_load_attr prog_load_attr = {
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
};
|
||||
const char *optstr = "SN";
|
||||
int prog_fd, map_fd, opt;
|
||||
struct bpf_object *obj;
|
||||
struct bpf_map *map;
|
||||
char filename[256];
|
||||
int opt;
|
||||
|
||||
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
||||
switch (opt) {
|
||||
|
|
@ -102,13 +107,19 @@ int main(int argc, char **argv)
|
|||
ifindex = strtoul(argv[optind], NULL, 0);
|
||||
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
prog_load_attr.file = filename;
|
||||
|
||||
if (load_bpf_file(filename)) {
|
||||
printf("%s", bpf_log_buf);
|
||||
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
|
||||
return 1;
|
||||
|
||||
map = bpf_map__next(NULL, obj);
|
||||
if (!map) {
|
||||
printf("finding a map in obj file failed\n");
|
||||
return 1;
|
||||
}
|
||||
map_fd = bpf_map__fd(map);
|
||||
|
||||
if (!prog_fd[0]) {
|
||||
if (!prog_fd) {
|
||||
printf("load_bpf_file: %s\n", strerror(errno));
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -116,12 +127,12 @@ int main(int argc, char **argv)
|
|||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
|
||||
printf("link set xdp fd failed\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
poll_stats(2);
|
||||
poll_stats(map_fd, 2);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,9 +18,8 @@
|
|||
#include <netinet/ether.h>
|
||||
#include <unistd.h>
|
||||
#include <time.h>
|
||||
#include "bpf_load.h"
|
||||
#include "libbpf.h"
|
||||
#include "bpf_util.h"
|
||||
#include "bpf/bpf.h"
|
||||
#include "bpf/libbpf.h"
|
||||
|
||||
#define STATS_INTERVAL_S 2U
|
||||
|
||||
|
|
@ -36,7 +35,7 @@ static void int_exit(int sig)
|
|||
|
||||
/* simple "icmp packet too big sent" counter
|
||||
*/
|
||||
static void poll_stats(unsigned int kill_after_s)
|
||||
static void poll_stats(unsigned int map_fd, unsigned int kill_after_s)
|
||||
{
|
||||
time_t started_at = time(NULL);
|
||||
__u64 value = 0;
|
||||
|
|
@ -46,7 +45,7 @@ static void poll_stats(unsigned int kill_after_s)
|
|||
while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
|
||||
sleep(STATS_INTERVAL_S);
|
||||
|
||||
assert(bpf_map_lookup_elem(map_fd[0], &key, &value) == 0);
|
||||
assert(bpf_map_lookup_elem(map_fd, &key, &value) == 0);
|
||||
|
||||
printf("icmp \"packet too big\" sent: %10llu pkts\n", value);
|
||||
}
|
||||
|
|
@ -66,14 +65,17 @@ static void usage(const char *cmd)
|
|||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
||||
struct bpf_prog_load_attr prog_load_attr = {
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
};
|
||||
unsigned char opt_flags[256] = {};
|
||||
unsigned int kill_after_s = 0;
|
||||
const char *optstr = "i:T:SNh";
|
||||
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
||||
int i, prog_fd, map_fd, opt;
|
||||
struct bpf_object *obj;
|
||||
struct bpf_map *map;
|
||||
char filename[256];
|
||||
int opt;
|
||||
int i;
|
||||
|
||||
|
||||
for (i = 0; i < strlen(optstr); i++)
|
||||
if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
|
||||
|
|
@ -115,13 +117,19 @@ int main(int argc, char **argv)
|
|||
}
|
||||
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
prog_load_attr.file = filename;
|
||||
|
||||
if (load_bpf_file(filename)) {
|
||||
printf("%s", bpf_log_buf);
|
||||
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
|
||||
return 1;
|
||||
|
||||
map = bpf_map__next(NULL, obj);
|
||||
if (!map) {
|
||||
printf("finding a map in obj file failed\n");
|
||||
return 1;
|
||||
}
|
||||
map_fd = bpf_map__fd(map);
|
||||
|
||||
if (!prog_fd[0]) {
|
||||
if (!prog_fd) {
|
||||
printf("load_bpf_file: %s\n", strerror(errno));
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -129,12 +137,12 @@ int main(int argc, char **argv)
|
|||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
|
||||
printf("link set xdp fd failed\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
poll_stats(kill_after_s);
|
||||
poll_stats(map_fd, kill_after_s);
|
||||
|
||||
bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
|
||||
|
||||
|
|
|
|||
|
|
@ -22,8 +22,8 @@ static const char *__doc__ = " XDP RX-queue info extract example\n\n"
|
|||
#include <arpa/inet.h>
|
||||
#include <linux/if_link.h>
|
||||
|
||||
#include "libbpf.h"
|
||||
#include "bpf_load.h"
|
||||
#include "bpf/bpf.h"
|
||||
#include "bpf/libbpf.h"
|
||||
#include "bpf_util.h"
|
||||
|
||||
static int ifindex = -1;
|
||||
|
|
@ -32,6 +32,9 @@ static char *ifname;
|
|||
|
||||
static __u32 xdp_flags;
|
||||
|
||||
static struct bpf_map *stats_global_map;
|
||||
static struct bpf_map *rx_queue_index_map;
|
||||
|
||||
/* Exit return codes */
|
||||
#define EXIT_OK 0
|
||||
#define EXIT_FAIL 1
|
||||
|
|
@ -174,7 +177,7 @@ static struct datarec *alloc_record_per_cpu(void)
|
|||
|
||||
static struct record *alloc_record_per_rxq(void)
|
||||
{
|
||||
unsigned int nr_rxqs = map_data[2].def.max_entries;
|
||||
unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
|
||||
struct record *array;
|
||||
size_t size;
|
||||
|
||||
|
|
@ -190,7 +193,7 @@ static struct record *alloc_record_per_rxq(void)
|
|||
|
||||
static struct stats_record *alloc_stats_record(void)
|
||||
{
|
||||
unsigned int nr_rxqs = map_data[2].def.max_entries;
|
||||
unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
|
||||
struct stats_record *rec;
|
||||
int i;
|
||||
|
||||
|
|
@ -210,7 +213,7 @@ static struct stats_record *alloc_stats_record(void)
|
|||
|
||||
static void free_stats_record(struct stats_record *r)
|
||||
{
|
||||
unsigned int nr_rxqs = map_data[2].def.max_entries;
|
||||
unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < nr_rxqs; i++)
|
||||
|
|
@ -254,11 +257,11 @@ static void stats_collect(struct stats_record *rec)
|
|||
{
|
||||
int fd, i, max_rxqs;
|
||||
|
||||
fd = map_data[1].fd; /* map: stats_global_map */
|
||||
fd = bpf_map__fd(stats_global_map);
|
||||
map_collect_percpu(fd, 0, &rec->stats);
|
||||
|
||||
fd = map_data[2].fd; /* map: rx_queue_index_map */
|
||||
max_rxqs = map_data[2].def.max_entries;
|
||||
fd = bpf_map__fd(rx_queue_index_map);
|
||||
max_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
|
||||
for (i = 0; i < max_rxqs; i++)
|
||||
map_collect_percpu(fd, i, &rec->rxq[i]);
|
||||
}
|
||||
|
|
@ -304,8 +307,8 @@ static void stats_print(struct stats_record *stats_rec,
|
|||
struct stats_record *stats_prev,
|
||||
int action)
|
||||
{
|
||||
unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
|
||||
unsigned int nr_cpus = bpf_num_possible_cpus();
|
||||
unsigned int nr_rxqs = map_data[2].def.max_entries;
|
||||
double pps = 0, err = 0;
|
||||
struct record *rec, *prev;
|
||||
double t;
|
||||
|
|
@ -419,31 +422,44 @@ static void stats_poll(int interval, int action)
|
|||
int main(int argc, char **argv)
|
||||
{
|
||||
struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
|
||||
struct bpf_prog_load_attr prog_load_attr = {
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
};
|
||||
int prog_fd, map_fd, opt, err;
|
||||
bool use_separators = true;
|
||||
struct config cfg = { 0 };
|
||||
struct bpf_object *obj;
|
||||
struct bpf_map *map;
|
||||
char filename[256];
|
||||
int longindex = 0;
|
||||
int interval = 2;
|
||||
__u32 key = 0;
|
||||
int opt, err;
|
||||
|
||||
char action_str_buf[XDP_ACTION_MAX_STRLEN + 1 /* for \0 */] = { 0 };
|
||||
int action = XDP_PASS; /* Default action */
|
||||
char *action_str = NULL;
|
||||
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
prog_load_attr.file = filename;
|
||||
|
||||
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
||||
perror("setrlimit(RLIMIT_MEMLOCK)");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (load_bpf_file(filename)) {
|
||||
fprintf(stderr, "ERR in load_bpf_file(): %s", bpf_log_buf);
|
||||
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
|
||||
return EXIT_FAIL;
|
||||
|
||||
map = bpf_map__next(NULL, obj);
|
||||
stats_global_map = bpf_map__next(map, obj);
|
||||
rx_queue_index_map = bpf_map__next(stats_global_map, obj);
|
||||
if (!map || !stats_global_map || !rx_queue_index_map) {
|
||||
printf("finding a map in obj file failed\n");
|
||||
return EXIT_FAIL;
|
||||
}
|
||||
map_fd = bpf_map__fd(map);
|
||||
|
||||
if (!prog_fd[0]) {
|
||||
if (!prog_fd) {
|
||||
fprintf(stderr, "ERR: load_bpf_file: %s\n", strerror(errno));
|
||||
return EXIT_FAIL;
|
||||
}
|
||||
|
|
@ -512,7 +528,7 @@ int main(int argc, char **argv)
|
|||
setlocale(LC_NUMERIC, "en_US");
|
||||
|
||||
/* User-side setup ifindex in config_map */
|
||||
err = bpf_map_update_elem(map_fd[0], &key, &cfg, 0);
|
||||
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);
|
||||
|
|
@ -521,7 +537,7 @@ int main(int argc, char **argv)
|
|||
/* Remove XDP program when program is interrupted */
|
||||
signal(SIGINT, int_exit);
|
||||
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
|
||||
if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
|
||||
fprintf(stderr, "link set xdp fd failed\n");
|
||||
return EXIT_FAIL_XDP;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue