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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

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Alexei Starovoitov says:

====================
pull-request: bpf 2020-11-06

1) Pre-allocated per-cpu hashmap needs to zero-fill reused element, from David.

2) Tighten bpf_lsm function check, from KP.

3) Fix bpftool attaching to flow dissector, from Lorenz.

4) Use -fno-gcse for the whole kernel/bpf/core.c instead of function attribute, from Ard.

* git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf: Update verification logic for LSM programs
  bpf: Zero-fill re-used per-cpu map element
  bpf: BPF_PRELOAD depends on BPF_SYSCALL
  tools/bpftool: Fix attaching flow dissector
  libbpf: Fix possible use after free in xsk_socket__delete
  libbpf: Fix null dereference in xsk_socket__delete
  libbpf, hashmap: Fix undefined behavior in hash_bits
  bpf: Don't rely on GCC __attribute__((optimize)) to disable GCSE
  tools, bpftool: Remove two unused variables.
  tools, bpftool: Avoid array index warnings.
  xsk: Fix possible memory leak at socket close
  bpf: Add struct bpf_redir_neigh forward declaration to BPF helper defs
  samples/bpf: Set rlimit for memlock to infinity in all samples
  bpf: Fix -Wshadow warnings
  selftest/bpf: Fix profiler test using CO-RE relocation for enums
====================

Link: https://lore.kernel.org/r/20201106221759.24143-1-alexei.starovoitov@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2020-11-06 17:49:31 -08:00
commit 86bbf01977
25 changed files with 346 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/compiler-gcc.h
View File

@ -175,5 +175,3 @@
#else
#define __diag_GCC_8(s)
#endif
#define __no_fgcse __attribute__((optimize("-fno-gcse")))

4
include/linux/compiler_types.h
View File

@ -247,10 +247,6 @@ struct ftrace_likely_data {
#define asm_inline asm
#endif
#ifndef __no_fgcse
# define __no_fgcse
#endif
/* Are two types/vars the same type (ignoring qualifiers)? */
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))

22
include/linux/filter.h
View File

@ -558,21 +558,21 @@ struct sk_filter {
DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
#define __BPF_PROG_RUN(prog, ctx, dfunc) ({ \
u32 ret; \
u32 __ret; \
cant_migrate(); \
if (static_branch_unlikely(&bpf_stats_enabled_key)) { \
struct bpf_prog_stats *stats; \
u64 start = sched_clock(); \
ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
stats = this_cpu_ptr(prog->aux->stats); \
u64_stats_update_begin(&stats->syncp); \
stats->cnt++; \
stats->nsecs += sched_clock() - start; \
u64_stats_update_end(&stats->syncp); \
struct bpf_prog_stats *__stats; \
u64 __start = sched_clock(); \
__ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
__stats = this_cpu_ptr(prog->aux->stats); \
u64_stats_update_begin(&__stats->syncp); \
__stats->cnt++; \
__stats->nsecs += sched_clock() - __start; \
u64_stats_update_end(&__stats->syncp); \
} else { \
ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
__ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
} \
ret; })
__ret; })
#define BPF_PROG_RUN(prog, ctx) \
__BPF_PROG_RUN(prog, ctx, bpf_dispatcher_nop_func)

2
include/net/xsk_buff_pool.h
View File

@ -86,7 +86,7 @@ int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
void xp_destroy(struct xsk_buff_pool *pool);
void xp_release(struct xdp_buff_xsk *xskb);
void xp_get_pool(struct xsk_buff_pool *pool);
void xp_put_pool(struct xsk_buff_pool *pool);
bool xp_put_pool(struct xsk_buff_pool *pool);
void xp_clear_dev(struct xsk_buff_pool *pool);
void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);
void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);

6
kernel/bpf/Makefile
View File

@ -1,6 +1,10 @@
# SPDX-License-Identifier: GPL-2.0
obj-y := core.o
CFLAGS_core.o += $(call cc-disable-warning, override-init)
ifneq ($(CONFIG_BPF_JIT_ALWAYS_ON),y)
# ___bpf_prog_run() needs GCSE disabled on x86; see 3193c0836f203 for details
cflags-nogcse-$(CONFIG_X86)$(CONFIG_CC_IS_GCC) := -fno-gcse
endif
CFLAGS_core.o += $(call cc-disable-warning, override-init) $(cflags-nogcse-yy)
obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o map_iter.o task_iter.o prog_iter.o
obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o

10
kernel/bpf/bpf_lsm.c
View File

@ -13,6 +13,7 @@
#include <linux/bpf_verifier.h>
#include <net/bpf_sk_storage.h>
#include <linux/bpf_local_storage.h>
#include <linux/btf_ids.h>
/* For every LSM hook that allows attachment of BPF programs, declare a nop
* function where a BPF program can be attached.
@ -26,7 +27,11 @@ noinline RET bpf_lsm_##NAME(__VA_ARGS__) \
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
#define BPF_LSM_SYM_PREFX "bpf_lsm_"
#define LSM_HOOK(RET, DEFAULT, NAME, ...) BTF_ID(func, bpf_lsm_##NAME)
BTF_SET_START(bpf_lsm_hooks)
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
BTF_SET_END(bpf_lsm_hooks)
int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
const struct bpf_prog *prog)
@ -37,8 +42,7 @@ int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
return -EINVAL;
}
if (strncmp(BPF_LSM_SYM_PREFX, prog->aux->attach_func_name,
sizeof(BPF_LSM_SYM_PREFX) - 1)) {
if (!btf_id_set_contains(&bpf_lsm_hooks, prog->aux->attach_btf_id)) {
bpf_log(vlog, "attach_btf_id %u points to wrong type name %s\n",
prog->aux->attach_btf_id, prog->aux->attach_func_name);
return -EINVAL;

2
kernel/bpf/core.c
View File

@ -1369,7 +1369,7 @@ u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
*
* Decode and execute eBPF instructions.
*/
static u64 __no_fgcse ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
{
#define BPF_INSN_2_LBL(x, y) [BPF_##x | BPF_##y] = &&x##_##y
#define BPF_INSN_3_LBL(x, y, z) [BPF_##x | BPF_##y | BPF_##z] = &&x##_##y##_##z

30
kernel/bpf/hashtab.c
View File

@ -821,6 +821,32 @@ static void pcpu_copy_value(struct bpf_htab *htab, void __percpu *pptr,
}
}
static void pcpu_init_value(struct bpf_htab *htab, void __percpu *pptr,
void *value, bool onallcpus)
{
/* When using prealloc and not setting the initial value on all cpus,
* zero-fill element values for other cpus (just as what happens when
* not using prealloc). Otherwise, bpf program has no way to ensure
* known initial values for cpus other than current one
* (onallcpus=false always when coming from bpf prog).
*/
if (htab_is_prealloc(htab) && !onallcpus) {
u32 size = round_up(htab->map.value_size, 8);
int current_cpu = raw_smp_processor_id();
int cpu;
for_each_possible_cpu(cpu) {
if (cpu == current_cpu)
bpf_long_memcpy(per_cpu_ptr(pptr, cpu), value,
size);
else
memset(per_cpu_ptr(pptr, cpu), 0, size);
}
} else {
pcpu_copy_value(htab, pptr, value, onallcpus);
}
}
static bool fd_htab_map_needs_adjust(const struct bpf_htab *htab)
{
return htab->map.map_type == BPF_MAP_TYPE_HASH_OF_MAPS &&
@ -891,7 +917,7 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
}
}
pcpu_copy_value(htab, pptr, value, onallcpus);
pcpu_init_value(htab, pptr, value, onallcpus);
if (!prealloc)
htab_elem_set_ptr(l_new, key_size, pptr);
@ -1183,7 +1209,7 @@ static int __htab_lru_percpu_map_update_elem(struct bpf_map *map, void *key,
pcpu_copy_value(htab, htab_elem_get_ptr(l_old, key_size),
value, onallcpus);
} else {
pcpu_copy_value(htab, htab_elem_get_ptr(l_new, key_size),
pcpu_init_value(htab, htab_elem_get_ptr(l_new, key_size),
value, onallcpus);
hlist_nulls_add_head_rcu(&l_new->hash_node, head);
l_new = NULL;

1
kernel/bpf/preload/Kconfig
View File

@ -6,6 +6,7 @@ config USERMODE_DRIVER
menuconfig BPF_PRELOAD
bool "Preload BPF file system with kernel specific program and map iterators"
depends on BPF
depends on BPF_SYSCALL
# The dependency on !COMPILE_TEST prevents it from being enabled
# in allmodconfig or allyesconfig configurations
depends on !COMPILE_TEST

3
net/xdp/xsk.c
View File

@ -1146,7 +1146,8 @@ static void xsk_destruct(struct sock *sk)
if (!sock_flag(sk, SOCK_DEAD))
return;
xp_put_pool(xs->pool);
if (!xp_put_pool(xs->pool))
xdp_put_umem(xs->umem);
sk_refcnt_debug_dec(sk);
}

7
net/xdp/xsk_buff_pool.c
View File

@ -251,15 +251,18 @@ void xp_get_pool(struct xsk_buff_pool *pool)
refcount_inc(&pool->users);
}
void xp_put_pool(struct xsk_buff_pool *pool)
bool xp_put_pool(struct xsk_buff_pool *pool)
{
if (!pool)
return;
return false;
if (refcount_dec_and_test(&pool->users)) {
INIT_WORK(&pool->work, xp_release_deferred);
schedule_work(&pool->work);
return true;
}
return false;
}
static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool)

2
samples/bpf/task_fd_query_user.c
View File

@ -290,7 +290,7 @@ static int test_debug_fs_uprobe(char *binary_path, long offset, bool is_return)
int main(int argc, char **argv)
{
struct rlimit r = {1024*1024, RLIM_INFINITY};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
extern char __executable_start;
char filename[256], buf[256];
__u64 uprobe_file_offset;

2
samples/bpf/tracex2_user.c
View File

@ -116,7 +116,7 @@ static void int_exit(int sig)
int main(int ac, char **argv)
{
struct rlimit r = {1024*1024, RLIM_INFINITY};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
long key, next_key, value;
struct bpf_link *links[2];
struct bpf_program *prog;

2
samples/bpf/tracex3_user.c
View File

@ -107,7 +107,7 @@ static void print_hist(int fd)
int main(int ac, char **argv)
{
struct rlimit r = {1024*1024, RLIM_INFINITY};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct bpf_link *links[2];
struct bpf_program *prog;
struct bpf_object *obj;

2
samples/bpf/xdp_redirect_cpu_user.c
View File

@ -765,7 +765,7 @@ static int load_cpumap_prog(char *file_name, char *prog_name,
int main(int argc, char **argv)
{
struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
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;

2
samples/bpf/xdp_rxq_info_user.c
View File

@ -450,7 +450,7 @@ static void stats_poll(int interval, int action, __u32 cfg_opt)
int main(int argc, char **argv)
{
__u32 cfg_options= NO_TOUCH ; /* Default: Don't touch packet memory */
struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct bpf_prog_load_attr prog_load_attr = {
.prog_type = BPF_PROG_TYPE_XDP,
};

1
scripts/bpf_helpers_doc.py
View File

@ -408,6 +408,7 @@ class PrinterHelpers(Printer):
'struct bpf_perf_event_data',
'struct bpf_perf_event_value',
'struct bpf_pidns_info',
'struct bpf_redir_neigh',
'struct bpf_sock',
'struct bpf_sock_addr',
'struct bpf_sock_ops',

7
tools/bpf/bpftool/feature.c
View File

@ -843,9 +843,14 @@ static int handle_perms(void)
else
p_err("missing %s%s%s%s%s%s%s%srequired for full feature probing; run as root or use 'unprivileged'",
capability_msg(bpf_caps, 0),
#ifdef CAP_BPF
capability_msg(bpf_caps, 1),
capability_msg(bpf_caps, 2),
capability_msg(bpf_caps, 3));
capability_msg(bpf_caps, 3)
#else
"", "", "", "", "", ""
#endif /* CAP_BPF */
);
goto exit_free;
}

2
tools/bpf/bpftool/prog.c
View File

@ -940,7 +940,7 @@ static int parse_attach_detach_args(int argc, char **argv, int *progfd,
}
if (*attach_type == BPF_FLOW_DISSECTOR) {
*mapfd = -1;
*mapfd = 0;
return 0;
}

4
tools/bpf/bpftool/skeleton/profiler.bpf.c
View File

@ -70,7 +70,7 @@ int BPF_PROG(fentry_XXX)
static inline void
fexit_update_maps(u32 id, struct bpf_perf_event_value *after)
{
struct bpf_perf_event_value *before, diff, *accum;
struct bpf_perf_event_value *before, diff;
before = bpf_map_lookup_elem(&fentry_readings, &id);
/* only account samples with a valid fentry_reading */
@ -95,7 +95,7 @@ int BPF_PROG(fexit_XXX)
{
struct bpf_perf_event_value readings[MAX_NUM_MATRICS];
u32 cpu = bpf_get_smp_processor_id();
u32 i, one = 1, zero = 0;
u32 i, zero = 0;
int err;
u64 *count;

15
tools/lib/bpf/hashmap.h
View File

@ -15,6 +15,9 @@
static inline size_t hash_bits(size_t h, int bits)
{
/* shuffle bits and return requested number of upper bits */
if (bits == 0)
return 0;
#if (__SIZEOF_SIZE_T__ == __SIZEOF_LONG_LONG__)
/* LP64 case */
return (h * 11400714819323198485llu) >> (__SIZEOF_LONG_LONG__ * 8 - bits);
@ -174,17 +177,17 @@ bool hashmap__find(const struct hashmap *map, const void *key, void **value);
* @key: key to iterate entries for
*/
#define hashmap__for_each_key_entry(map, cur, _key) \
for (cur = ({ size_t bkt = hash_bits(map->hash_fn((_key), map->ctx),\
map->cap_bits); \
map->buckets ? map->buckets[bkt] : NULL; }); \
for (cur = map->buckets \
? map->buckets[hash_bits(map->hash_fn((_key), map->ctx), map->cap_bits)] \
: NULL; \
cur; \
cur = cur->next) \
if (map->equal_fn(cur->key, (_key), map->ctx))
#define hashmap__for_each_key_entry_safe(map, cur, tmp, _key) \
for (cur = ({ size_t bkt = hash_bits(map->hash_fn((_key), map->ctx),\
map->cap_bits); \
cur = map->buckets ? map->buckets[bkt] : NULL; }); \
for (cur = map->buckets \
? map->buckets[hash_bits(map->hash_fn((_key), map->ctx), map->cap_bits)] \
: NULL; \
cur && ({ tmp = cur->next; true; }); \
cur = tmp) \
if (map->equal_fn(cur->key, (_key), map->ctx))

9
tools/lib/bpf/xsk.c
View File

@ -891,13 +891,16 @@ int xsk_umem__delete(struct xsk_umem *umem)
void xsk_socket__delete(struct xsk_socket *xsk)
{
size_t desc_sz = sizeof(struct xdp_desc);
struct xsk_ctx *ctx = xsk->ctx;
struct xdp_mmap_offsets off;
struct xsk_umem *umem;
struct xsk_ctx *ctx;
int err;
if (!xsk)
return;
ctx = xsk->ctx;
umem = ctx->umem;
if (ctx->prog_fd != -1) {
xsk_delete_bpf_maps(xsk);
close(ctx->prog_fd);
@ -917,11 +920,11 @@ void xsk_socket__delete(struct xsk_socket *xsk)
xsk_put_ctx(ctx);
ctx->umem->refcount--;
umem->refcount--;
/* Do not close an fd that also has an associated umem connected
* to it.
*/
if (xsk->fd != ctx->umem->fd)
if (xsk->fd != umem->fd)
close(xsk->fd);
free(xsk);
}

214
tools/testing/selftests/bpf/prog_tests/map_init.c Normal file
View File

@ -0,0 +1,214 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2020 Tessares SA <http://www.tessares.net> */
#include <test_progs.h>
#include "test_map_init.skel.h"
#define TEST_VALUE 0x1234
#define FILL_VALUE 0xdeadbeef
static int nr_cpus;
static int duration;
typedef unsigned long long map_key_t;
typedef unsigned long long map_value_t;
typedef struct {
map_value_t v; /* padding */
} __bpf_percpu_val_align pcpu_map_value_t;
static int map_populate(int map_fd, int num)
{
pcpu_map_value_t value[nr_cpus];
int i, err;
map_key_t key;
for (i = 0; i < nr_cpus; i++)
bpf_percpu(value, i) = FILL_VALUE;
for (key = 1; key <= num; key++) {
err = bpf_map_update_elem(map_fd, &key, value, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem"))
return -1;
}
return 0;
}
static struct test_map_init *setup(enum bpf_map_type map_type, int map_sz,
int *map_fd, int populate)
{
struct test_map_init *skel;
int err;
skel = test_map_init__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return NULL;
err = bpf_map__set_type(skel->maps.hashmap1, map_type);
if (!ASSERT_OK(err, "bpf_map__set_type"))
goto error;
err = bpf_map__set_max_entries(skel->maps.hashmap1, map_sz);
if (!ASSERT_OK(err, "bpf_map__set_max_entries"))
goto error;
err = test_map_init__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto error;
*map_fd = bpf_map__fd(skel->maps.hashmap1);
if (CHECK(*map_fd < 0, "bpf_map__fd", "failed\n"))
goto error;
err = map_populate(*map_fd, populate);
if (!ASSERT_OK(err, "map_populate"))
goto error_map;
return skel;
error_map:
close(*map_fd);
error:
test_map_init__destroy(skel);
return NULL;
}
/* executes bpf program that updates map with key, value */
static int prog_run_insert_elem(struct test_map_init *skel, map_key_t key,
map_value_t value)
{
struct test_map_init__bss *bss;
bss = skel->bss;
bss->inKey = key;
bss->inValue = value;
bss->inPid = getpid();
if (!ASSERT_OK(test_map_init__attach(skel), "skel_attach"))
return -1;
/* Let tracepoint trigger */
syscall(__NR_getpgid);
test_map_init__detach(skel);
return 0;
}
static int check_values_one_cpu(pcpu_map_value_t *value, map_value_t expected)
{
int i, nzCnt = 0;
map_value_t val;
for (i = 0; i < nr_cpus; i++) {
val = bpf_percpu(value, i);
if (val) {
if (CHECK(val != expected, "map value",
"unexpected for cpu %d: 0x%llx\n", i, val))
return -1;
nzCnt++;
}
}
if (CHECK(nzCnt != 1, "map value", "set for %d CPUs instead of 1!\n",
nzCnt))
return -1;
return 0;
}
/* Add key=1 elem with values set for all CPUs
* Delete elem key=1
* Run bpf prog that inserts new key=1 elem with value=0x1234
* (bpf prog can only set value for current CPU)
* Lookup Key=1 and check value is as expected for all CPUs:
* value set by bpf prog for one CPU, 0 for all others
*/
static void test_pcpu_map_init(void)
{
pcpu_map_value_t value[nr_cpus];
struct test_map_init *skel;
int map_fd, err;
map_key_t key;
/* max 1 elem in map so insertion is forced to reuse freed entry */
skel = setup(BPF_MAP_TYPE_PERCPU_HASH, 1, &map_fd, 1);
if (!ASSERT_OK_PTR(skel, "prog_setup"))
return;
/* delete element so the entry can be re-used*/
key = 1;
err = bpf_map_delete_elem(map_fd, &key);
if (!ASSERT_OK(err, "bpf_map_delete_elem"))
goto cleanup;
/* run bpf prog that inserts new elem, re-using the slot just freed */
err = prog_run_insert_elem(skel, key, TEST_VALUE);
if (!ASSERT_OK(err, "prog_run_insert_elem"))
goto cleanup;
/* check that key=1 was re-created by bpf prog */
err = bpf_map_lookup_elem(map_fd, &key, value);
if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
goto cleanup;
/* and has expected values */
check_values_one_cpu(value, TEST_VALUE);
cleanup:
test_map_init__destroy(skel);
}
/* Add key=1 and key=2 elems with values set for all CPUs
* Run bpf prog that inserts new key=3 elem
* (only for current cpu; other cpus should have initial value = 0)
* Lookup Key=1 and check value is as expected for all CPUs
*/
static void test_pcpu_lru_map_init(void)
{
pcpu_map_value_t value[nr_cpus];
struct test_map_init *skel;
int map_fd, err;
map_key_t key;
/* Set up LRU map with 2 elements, values filled for all CPUs.
* With these 2 elements, the LRU map is full
*/
skel = setup(BPF_MAP_TYPE_LRU_PERCPU_HASH, 2, &map_fd, 2);
if (!ASSERT_OK_PTR(skel, "prog_setup"))
return;
/* run bpf prog that inserts new key=3 element, re-using LRU slot */
key = 3;
err = prog_run_insert_elem(skel, key, TEST_VALUE);
if (!ASSERT_OK(err, "prog_run_insert_elem"))
goto cleanup;
/* check that key=3 replaced one of earlier elements */
err = bpf_map_lookup_elem(map_fd, &key, value);
if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
goto cleanup;
/* and has expected values */
check_values_one_cpu(value, TEST_VALUE);
cleanup:
test_map_init__destroy(skel);
}
void test_map_init(void)
{
nr_cpus = bpf_num_possible_cpus();
if (nr_cpus <= 1) {
printf("%s:SKIP: >1 cpu needed for this test\n", __func__);
test__skip();
return;
}
if (test__start_subtest("pcpu_map_init"))
test_pcpu_map_init();
if (test__start_subtest("pcpu_lru_map_init"))
test_pcpu_lru_map_init();
}

11
tools/testing/selftests/bpf/progs/profiler.inc.h
View File

@ -243,7 +243,10 @@ static ino_t get_inode_from_kernfs(struct kernfs_node* node)
}
}
int pids_cgrp_id = 1;
extern bool CONFIG_CGROUP_PIDS __kconfig __weak;
enum cgroup_subsys_id___local {
pids_cgrp_id___local = 123, /* value doesn't matter */
};
static INLINE void* populate_cgroup_info(struct cgroup_data_t* cgroup_data,
struct task_struct* task,
@ -253,7 +256,9 @@ static INLINE void* populate_cgroup_info(struct cgroup_data_t* cgroup_data,
BPF_CORE_READ(task, nsproxy, cgroup_ns, root_cset, dfl_cgrp, kn);
struct kernfs_node* proc_kernfs = BPF_CORE_READ(task, cgroups, dfl_cgrp, kn);
if (ENABLE_CGROUP_V1_RESOLVER) {
if (ENABLE_CGROUP_V1_RESOLVER && CONFIG_CGROUP_PIDS) {
int cgrp_id = bpf_core_enum_value(enum cgroup_subsys_id___local,
pids_cgrp_id___local);
#ifdef UNROLL
#pragma unroll
#endif
@ -262,7 +267,7 @@ static INLINE void* populate_cgroup_info(struct cgroup_data_t* cgroup_data,
BPF_CORE_READ(task, cgroups, subsys[i]);
if (subsys != NULL) {
int subsys_id = BPF_CORE_READ(subsys, ss, id);
if (subsys_id == pids_cgrp_id) {
if (subsys_id == cgrp_id) {
proc_kernfs = BPF_CORE_READ(subsys, cgroup, kn);
root_kernfs = BPF_CORE_READ(subsys, ss, root, kf_root, kn);
break;

33
tools/testing/selftests/bpf/progs/test_map_init.c Normal file
View File

@ -0,0 +1,33 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Tessares SA <http://www.tessares.net> */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
__u64 inKey = 0;
__u64 inValue = 0;
__u32 inPid = 0;
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
__uint(max_entries, 2);
__type(key, __u64);
__type(value, __u64);
} hashmap1 SEC(".maps");
SEC("tp/syscalls/sys_enter_getpgid")
int sysenter_getpgid(const void *ctx)
{
/* Just do it for once, when called from our own test prog. This
* ensures the map value is only updated for a single CPU.
*/
int cur_pid = bpf_get_current_pid_tgid() >> 32;
if (cur_pid == inPid)
bpf_map_update_elem(&hashmap1, &inKey, &inValue, BPF_NOEXIST);
return 0;
}
char _license[] SEC("license") = "GPL";