summaryrefslogtreecommitdiffstats
path: root/tools/bpf/bpftool/prog.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/bpf/bpftool/prog.c')
-rw-r--r--tools/bpf/bpftool/prog.c148
1 files changed, 135 insertions, 13 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 2bdd5ecd1aad..dce960d22106 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -31,6 +31,7 @@
* SOFTWARE.
*/
+#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
@@ -682,18 +683,34 @@ static int do_pin(int argc, char **argv)
return err;
}
+struct map_replace {
+ int idx;
+ int fd;
+ char *name;
+};
+
+int map_replace_compar(const void *p1, const void *p2)
+{
+ const struct map_replace *a = p1, *b = p2;
+
+ return a->idx - b->idx;
+}
+
static int do_load(int argc, char **argv)
{
enum bpf_attach_type expected_attach_type;
struct bpf_object_open_attr attr = {
.prog_type = BPF_PROG_TYPE_UNSPEC,
};
+ struct map_replace *map_replace = NULL;
+ unsigned int old_map_fds = 0;
struct bpf_program *prog;
struct bpf_object *obj;
struct bpf_map *map;
const char *pinfile;
+ unsigned int i, j;
__u32 ifindex = 0;
- int err;
+ int idx, err;
if (!REQ_ARGS(2))
return -1;
@@ -708,16 +725,16 @@ static int do_load(int argc, char **argv)
if (attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
p_err("program type already specified");
- return -1;
+ goto err_free_reuse_maps;
}
if (!REQ_ARGS(1))
- return -1;
+ goto err_free_reuse_maps;
/* Put a '/' at the end of type to appease libbpf */
type = malloc(strlen(*argv) + 2);
if (!type) {
p_err("mem alloc failed");
- return -1;
+ goto err_free_reuse_maps;
}
*type = 0;
strcat(type, *argv);
@@ -728,37 +745,81 @@ static int do_load(int argc, char **argv)
free(type);
if (err < 0) {
p_err("unknown program type '%s'", *argv);
- return err;
+ goto err_free_reuse_maps;
}
NEXT_ARG();
+ } else if (is_prefix(*argv, "map")) {
+ char *endptr, *name;
+ int fd;
+
+ NEXT_ARG();
+
+ if (!REQ_ARGS(4))
+ goto err_free_reuse_maps;
+
+ if (is_prefix(*argv, "idx")) {
+ NEXT_ARG();
+
+ idx = strtoul(*argv, &endptr, 0);
+ if (*endptr) {
+ p_err("can't parse %s as IDX", *argv);
+ goto err_free_reuse_maps;
+ }
+ name = NULL;
+ } else if (is_prefix(*argv, "name")) {
+ NEXT_ARG();
+
+ name = *argv;
+ idx = -1;
+ } else {
+ p_err("expected 'idx' or 'name', got: '%s'?",
+ *argv);
+ goto err_free_reuse_maps;
+ }
+ NEXT_ARG();
+
+ fd = map_parse_fd(&argc, &argv);
+ if (fd < 0)
+ goto err_free_reuse_maps;
+
+ map_replace = reallocarray(map_replace, old_map_fds + 1,
+ sizeof(*map_replace));
+ if (!map_replace) {
+ p_err("mem alloc failed");
+ goto err_free_reuse_maps;
+ }
+ map_replace[old_map_fds].idx = idx;
+ map_replace[old_map_fds].name = name;
+ map_replace[old_map_fds].fd = fd;
+ old_map_fds++;
} else if (is_prefix(*argv, "dev")) {
NEXT_ARG();
if (ifindex) {
p_err("offload device already specified");
- return -1;
+ goto err_free_reuse_maps;
}
if (!REQ_ARGS(1))
- return -1;
+ goto err_free_reuse_maps;
ifindex = if_nametoindex(*argv);
if (!ifindex) {
p_err("unrecognized netdevice '%s': %s",
*argv, strerror(errno));
- return -1;
+ goto err_free_reuse_maps;
}
NEXT_ARG();
} else {
- p_err("expected no more arguments, 'type' or 'dev', got: '%s'?",
+ p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
*argv);
- return -1;
+ goto err_free_reuse_maps;
}
}
obj = bpf_object__open_xattr(&attr);
if (IS_ERR_OR_NULL(obj)) {
p_err("failed to open object file");
- return -1;
+ goto err_free_reuse_maps;
}
prog = bpf_program__next(NULL, obj);
@@ -782,10 +843,62 @@ static int do_load(int argc, char **argv)
bpf_program__set_type(prog, attr.prog_type);
bpf_program__set_expected_attach_type(prog, expected_attach_type);
- bpf_map__for_each(map, obj)
+ qsort(map_replace, old_map_fds, sizeof(*map_replace),
+ map_replace_compar);
+
+ /* After the sort maps by name will be first on the list, because they
+ * have idx == -1. Resolve them.
+ */
+ j = 0;
+ while (j < old_map_fds && map_replace[j].name) {
+ i = 0;
+ bpf_map__for_each(map, obj) {
+ if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
+ map_replace[j].idx = i;
+ break;
+ }
+ i++;
+ }
+ if (map_replace[j].idx == -1) {
+ p_err("unable to find map '%s'", map_replace[j].name);
+ goto err_close_obj;
+ }
+ j++;
+ }
+ /* Resort if any names were resolved */
+ if (j)
+ qsort(map_replace, old_map_fds, sizeof(*map_replace),
+ map_replace_compar);
+
+ /* Set ifindex and name reuse */
+ j = 0;
+ idx = 0;
+ bpf_map__for_each(map, obj) {
if (!bpf_map__is_offload_neutral(map))
bpf_map__set_ifindex(map, ifindex);
+ if (j < old_map_fds && idx == map_replace[j].idx) {
+ err = bpf_map__reuse_fd(map, map_replace[j++].fd);
+ if (err) {
+ p_err("unable to set up map reuse: %d", err);
+ goto err_close_obj;
+ }
+
+ /* Next reuse wants to apply to the same map */
+ if (j < old_map_fds && map_replace[j].idx == idx) {
+ p_err("replacement for map idx %d specified more than once",
+ idx);
+ goto err_close_obj;
+ }
+ }
+
+ idx++;
+ }
+ if (j < old_map_fds) {
+ p_err("map idx '%d' not used", map_replace[j].idx);
+ goto err_close_obj;
+ }
+
err = bpf_object__load(obj);
if (err) {
p_err("failed to load object file");
@@ -799,11 +912,18 @@ static int do_load(int argc, char **argv)
jsonw_null(json_wtr);
bpf_object__close(obj);
+ for (i = 0; i < old_map_fds; i++)
+ close(map_replace[i].fd);
+ free(map_replace);
return 0;
err_close_obj:
bpf_object__close(obj);
+err_free_reuse_maps:
+ for (i = 0; i < old_map_fds; i++)
+ close(map_replace[i].fd);
+ free(map_replace);
return -1;
}
@@ -819,9 +939,11 @@ static int do_help(int argc, char **argv)
" %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n"
" %s %s dump jited PROG [{ file FILE | opcodes }]\n"
" %s %s pin PROG FILE\n"
- " %s %s load OBJ FILE [type TYPE] [dev NAME]\n"
+ " %s %s load OBJ FILE [type TYPE] [dev NAME] \\\n"
+ " [map { idx IDX | name NAME } MAP]\n"
" %s %s help\n"
"\n"
+ " " HELP_SPEC_MAP "\n"
" " HELP_SPEC_PROGRAM "\n"
" TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
" tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-13 14:33:10 +0100