diff --git a/include/linux/bpf.h b/include/linux/bpf.h index f58895830ada..360433f14496 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -275,6 +275,7 @@ struct bpf_map { } owner; bool bypass_spec_v1; bool frozen; /* write-once; write-protected by freeze_mutex */ + s64 __percpu *elem_count; }; static inline const char *btf_field_type_name(enum btf_field_type type) @@ -2040,6 +2041,35 @@ bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, } #endif +static inline int +bpf_map_init_elem_count(struct bpf_map *map) +{ + size_t size = sizeof(*map->elem_count), align = size; + gfp_t flags = GFP_USER | __GFP_NOWARN; + + map->elem_count = bpf_map_alloc_percpu(map, size, align, flags); + if (!map->elem_count) + return -ENOMEM; + + return 0; +} + +static inline void +bpf_map_free_elem_count(struct bpf_map *map) +{ + free_percpu(map->elem_count); +} + +static inline void bpf_map_inc_elem_count(struct bpf_map *map) +{ + this_cpu_inc(*map->elem_count); +} + +static inline void bpf_map_dec_elem_count(struct bpf_map *map) +{ + this_cpu_dec(*map->elem_count); +} + extern int sysctl_unprivileged_bpf_disabled; static inline bool bpf_allow_ptr_leaks(void) diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c index 56d3da7d0bc6..a8c7e1c5abfa 100644 --- a/kernel/bpf/hashtab.c +++ b/kernel/bpf/hashtab.c @@ -302,6 +302,7 @@ static struct htab_elem *prealloc_lru_pop(struct bpf_htab *htab, void *key, struct htab_elem *l; if (node) { + bpf_map_inc_elem_count(&htab->map); l = container_of(node, struct htab_elem, lru_node); memcpy(l->key, key, htab->map.key_size); return l; @@ -510,12 +511,16 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr) htab->n_buckets > U32_MAX / sizeof(struct bucket)) goto free_htab; + err = bpf_map_init_elem_count(&htab->map); + if (err) + goto free_htab; + err = -ENOMEM; htab->buckets = bpf_map_area_alloc(htab->n_buckets * sizeof(struct bucket), htab->map.numa_node); if (!htab->buckets) - goto free_htab; + goto free_elem_count; for (i = 0; i < HASHTAB_MAP_LOCK_COUNT; i++) { htab->map_locked[i] = bpf_map_alloc_percpu(&htab->map, @@ -593,6 +598,8 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr) bpf_map_area_free(htab->buckets); bpf_mem_alloc_destroy(&htab->pcpu_ma); bpf_mem_alloc_destroy(&htab->ma); +free_elem_count: + bpf_map_free_elem_count(&htab->map); free_htab: lockdep_unregister_key(&htab->lockdep_key); bpf_map_area_free(htab); @@ -804,6 +811,7 @@ static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node) if (l == tgt_l) { hlist_nulls_del_rcu(&l->hash_node); check_and_free_fields(htab, l); + bpf_map_dec_elem_count(&htab->map); break; } @@ -900,6 +908,8 @@ static bool is_map_full(struct bpf_htab *htab) static void inc_elem_count(struct bpf_htab *htab) { + bpf_map_inc_elem_count(&htab->map); + if (htab->use_percpu_counter) percpu_counter_add_batch(&htab->pcount, 1, PERCPU_COUNTER_BATCH); else @@ -908,6 +918,8 @@ static void inc_elem_count(struct bpf_htab *htab) static void dec_elem_count(struct bpf_htab *htab) { + bpf_map_dec_elem_count(&htab->map); + if (htab->use_percpu_counter) percpu_counter_add_batch(&htab->pcount, -1, PERCPU_COUNTER_BATCH); else @@ -920,6 +932,7 @@ static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l) htab_put_fd_value(htab, l); if (htab_is_prealloc(htab)) { + bpf_map_dec_elem_count(&htab->map); check_and_free_fields(htab, l); __pcpu_freelist_push(&htab->freelist, &l->fnode); } else { @@ -1000,6 +1013,7 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key, if (!l) return ERR_PTR(-E2BIG); l_new = container_of(l, struct htab_elem, fnode); + bpf_map_inc_elem_count(&htab->map); } } else { if (is_map_full(htab)) @@ -1168,6 +1182,7 @@ static long htab_map_update_elem(struct bpf_map *map, void *key, void *value, static void htab_lru_push_free(struct bpf_htab *htab, struct htab_elem *elem) { check_and_free_fields(htab, elem); + bpf_map_dec_elem_count(&htab->map); bpf_lru_push_free(&htab->lru, &elem->lru_node); } @@ -1357,8 +1372,10 @@ static long __htab_lru_percpu_map_update_elem(struct bpf_map *map, void *key, err: htab_unlock_bucket(htab, b, hash, flags); err_lock_bucket: - if (l_new) + if (l_new) { + bpf_map_dec_elem_count(&htab->map); bpf_lru_push_free(&htab->lru, &l_new->lru_node); + } return ret; } @@ -1523,6 +1540,7 @@ static void htab_map_free(struct bpf_map *map) prealloc_destroy(htab); } + bpf_map_free_elem_count(map); free_percpu(htab->extra_elems); bpf_map_area_free(htab->buckets); bpf_mem_alloc_destroy(&htab->pcpu_ma); diff --git a/kernel/bpf/map_iter.c b/kernel/bpf/map_iter.c index b0fa190b0979..d06d3b7150e5 100644 --- a/kernel/bpf/map_iter.c +++ b/kernel/bpf/map_iter.c @@ -93,7 +93,7 @@ static struct bpf_iter_reg bpf_map_reg_info = { .ctx_arg_info_size = 1, .ctx_arg_info = { { offsetof(struct bpf_iter__bpf_map, map), - PTR_TO_BTF_ID_OR_NULL }, + PTR_TO_BTF_ID_OR_NULL | PTR_TRUSTED }, }, .seq_info = &bpf_map_seq_info, }; @@ -193,3 +193,40 @@ static int __init bpf_map_iter_init(void) } late_initcall(bpf_map_iter_init); + +__diag_push(); +__diag_ignore_all("-Wmissing-prototypes", + "Global functions as their definitions will be in vmlinux BTF"); + +__bpf_kfunc s64 bpf_map_sum_elem_count(struct bpf_map *map) +{ + s64 *pcount; + s64 ret = 0; + int cpu; + + if (!map || !map->elem_count) + return 0; + + for_each_possible_cpu(cpu) { + pcount = per_cpu_ptr(map->elem_count, cpu); + ret += READ_ONCE(*pcount); + } + return ret; +} + +__diag_pop(); + +BTF_SET8_START(bpf_map_iter_kfunc_ids) +BTF_ID_FLAGS(func, bpf_map_sum_elem_count, KF_TRUSTED_ARGS) +BTF_SET8_END(bpf_map_iter_kfunc_ids) + +static const struct btf_kfunc_id_set bpf_map_iter_kfunc_set = { + .owner = THIS_MODULE, + .set = &bpf_map_iter_kfunc_ids, +}; + +static int init_subsystem(void) +{ + return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_map_iter_kfunc_set); +} +late_initcall(init_subsystem); diff --git a/kernel/bpf/preload/iterators/iterators.bpf.c b/kernel/bpf/preload/iterators/iterators.bpf.c index 03af863314ea..b78968b63fab 100644 --- a/kernel/bpf/preload/iterators/iterators.bpf.c +++ b/kernel/bpf/preload/iterators/iterators.bpf.c @@ -73,6 +73,8 @@ static const char *get_name(struct btf *btf, long btf_id, const char *fallback) return str + name_off; } +__s64 bpf_map_sum_elem_count(struct bpf_map *map) __ksym; + SEC("iter/bpf_map") int dump_bpf_map(struct bpf_iter__bpf_map *ctx) { @@ -84,9 +86,12 @@ int dump_bpf_map(struct bpf_iter__bpf_map *ctx) return 0; if (seq_num == 0) - BPF_SEQ_PRINTF(seq, " id name max_entries\n"); + BPF_SEQ_PRINTF(seq, " id name max_entries cur_entries\n"); + + BPF_SEQ_PRINTF(seq, "%4u %-16s %10d %10lld\n", + map->id, map->name, map->max_entries, + bpf_map_sum_elem_count(map)); - BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->max_entries); return 0; } diff --git a/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h index 70f236a82fe1..5b98ab02025e 100644 --- a/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h +++ b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h @@ -1,5 +1,5 @@ /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ -/* THIS FILE IS AUTOGENERATED! */ +/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ #ifndef __ITERATORS_BPF_SKEL_H__ #define __ITERATORS_BPF_SKEL_H__ @@ -18,8 +18,6 @@ struct iterators_bpf { int dump_bpf_map_fd; int dump_bpf_prog_fd; } links; - struct iterators_bpf__rodata { - } *rodata; }; static inline int @@ -68,7 +66,6 @@ iterators_bpf__destroy(struct iterators_bpf *skel) iterators_bpf__detach(skel); skel_closenz(skel->progs.dump_bpf_map.prog_fd); skel_closenz(skel->progs.dump_bpf_prog.prog_fd); - skel_free_map_data(skel->rodata, skel->maps.rodata.initial_value, 4096); skel_closenz(skel->maps.rodata.map_fd); skel_free(skel); } @@ -81,15 +78,6 @@ iterators_bpf__open(void) if (!skel) goto cleanup; skel->ctx.sz = (void *)&skel->links - (void *)skel; - skel->rodata = skel_prep_map_data((void *)"\ -\x20\x20\x69\x64\x20\x6e\x61\x6d\x65\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\ -\x20\x20\x20\x6d\x61\x78\x5f\x65\x6e\x74\x72\x69\x65\x73\x0a\0\x25\x34\x75\x20\ -\x25\x2d\x31\x36\x73\x25\x36\x64\x0a\0\x20\x20\x69\x64\x20\x6e\x61\x6d\x65\x20\ -\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x61\x74\x74\x61\x63\x68\x65\ -\x64\x0a\0\x25\x34\x75\x20\x25\x2d\x31\x36\x73\x20\x25\x73\x20\x25\x73\x0a\0", 4096, 98); - if (!skel->rodata) - goto cleanup; - skel->maps.rodata.initial_value = (__u64) (long) skel->rodata; return skel; cleanup: iterators_bpf__destroy(skel); @@ -103,7 +91,7 @@ iterators_bpf__load(struct iterators_bpf *skel) int err; opts.ctx = (struct bpf_loader_ctx *)skel; - opts.data_sz = 6056; + opts.data_sz = 6208; opts.data = (void *)"\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ @@ -138,190 +126,197 @@ 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+\x12\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x62\x70\x66\x5f\ +\x69\x74\x65\x72\x5f\x62\x70\x66\x5f\x70\x72\x6f\x67\0\0\0\0\0\0\0"; + opts.insns_sz = 2456; opts.insns = (void *)"\ \xbf\x16\0\0\0\0\0\0\xbf\xa1\0\0\0\0\0\0\x07\x01\0\0\x78\xff\xff\xff\xb7\x02\0\ \0\x88\0\0\0\xb7\x03\0\0\0\0\0\0\x85\0\0\0\x71\0\0\0\x05\0\x14\0\0\0\0\0\x61\ @@ -331,79 +326,83 @@ iterators_bpf__load(struct iterators_bpf *skel) \0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x01\0\0\0\0\ \0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xbf\x70\0\0\ \0\0\0\0\x95\0\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\ -\x48\x0e\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\ -\0\0\x44\x0e\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\ -\0\0\0\0\x38\x0e\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x05\0\0\ -\x18\x61\0\0\0\0\0\0\0\0\0\0\x30\x0e\0\0\x7b\x01\0\0\0\0\0\0\xb7\x01\0\0\x12\0\ 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+\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x98\x17\0\0\xb7\x03\0\0\x8c\0\0\0\x85\ +\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x08\x18\0\0\ +\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\ +\0\0\xc5\x07\xe3\xfe\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\ +\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\ +\0\0\0\0\x63\x06\x28\0\0\0\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\ +\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\ +\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0"; err = bpf_load_and_run(&opts); if (err < 0) return err; - skel->rodata = skel_finalize_map_data(&skel->maps.rodata.initial_value, - 4096, PROT_READ, skel->maps.rodata.map_fd); - if (!skel->rodata) - return -ENOMEM; return 0; } @@ -422,4 +421,15 @@ iterators_bpf__open_and_load(void) return skel; } +__attribute__((unused)) static void +iterators_bpf__assert(struct iterators_bpf *s __attribute__((unused))) +{ +#ifdef __cplusplus +#define _Static_assert static_assert +#endif +#ifdef __cplusplus +#undef _Static_assert +#endif +} + #endif /* __ITERATORS_BPF_SKEL_H__ */ diff --git a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c new file mode 100644 index 000000000000..1a9eeefda9a8 --- /dev/null +++ b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Isovalent */ + +#include +#include +#include + +#include +#include + +#include +#include + +#include "map_percpu_stats.skel.h" + +#define MAX_ENTRIES 16384 +#define MAX_ENTRIES_HASH_OF_MAPS 64 +#define N_THREADS 8 +#define MAX_MAP_KEY_SIZE 4 + +static void map_info(int map_fd, struct bpf_map_info *info) +{ + __u32 len = sizeof(*info); + int ret; + + memset(info, 0, sizeof(*info)); + + ret = bpf_obj_get_info_by_fd(map_fd, info, &len); + CHECK(ret < 0, "bpf_obj_get_info_by_fd", "error: %s\n", strerror(errno)); +} + +static const char *map_type_to_s(__u32 type) +{ + switch (type) { + case BPF_MAP_TYPE_HASH: + return "HASH"; + case BPF_MAP_TYPE_PERCPU_HASH: + return "PERCPU_HASH"; + case BPF_MAP_TYPE_LRU_HASH: + return "LRU_HASH"; + case BPF_MAP_TYPE_LRU_PERCPU_HASH: + return "LRU_PERCPU_HASH"; + case BPF_MAP_TYPE_HASH_OF_MAPS: + return "BPF_MAP_TYPE_HASH_OF_MAPS"; + default: + return ""; + } +} + +static __u32 map_count_elements(__u32 type, int map_fd) +{ + __u32 key = -1; + int n = 0; + + while (!bpf_map_get_next_key(map_fd, &key, &key)) + n++; + return n; +} + +#define BATCH true + +static void delete_and_lookup_batch(int map_fd, void *keys, __u32 count) +{ + static __u8 values[(8 << 10) * MAX_ENTRIES]; + void *in_batch = NULL, *out_batch; + __u32 save_count = count; + int ret; + + ret = bpf_map_lookup_and_delete_batch(map_fd, + &in_batch, &out_batch, + keys, values, &count, + NULL); + + /* + * Despite what uapi header says, lookup_and_delete_batch will return + * -ENOENT in case we successfully have deleted all elements, so check + * this separately + */ + CHECK(ret < 0 && (errno != ENOENT || !count), "bpf_map_lookup_and_delete_batch", + "error: %s\n", strerror(errno)); + + CHECK(count != save_count, + "bpf_map_lookup_and_delete_batch", + "deleted not all elements: removed=%u expected=%u\n", + count, save_count); +} + +static void delete_all_elements(__u32 type, int map_fd, bool batch) +{ + static __u8 val[8 << 10]; /* enough for 1024 CPUs */ + __u32 key = -1; + void *keys; + __u32 i, n; + int ret; + + keys = calloc(MAX_MAP_KEY_SIZE, MAX_ENTRIES); + CHECK(!keys, "calloc", "error: %s\n", strerror(errno)); + + for (n = 0; !bpf_map_get_next_key(map_fd, &key, &key); n++) + memcpy(keys + n*MAX_MAP_KEY_SIZE, &key, MAX_MAP_KEY_SIZE); + + if (batch) { + /* Can't mix delete_batch and delete_and_lookup_batch because + * they have different semantics in relation to the keys + * argument. However, delete_batch utilize map_delete_elem, + * so we actually test it in non-batch scenario */ + delete_and_lookup_batch(map_fd, keys, n); + } else { + /* Intentionally mix delete and lookup_and_delete so we can test both */ + for (i = 0; i < n; i++) { + void *keyp = keys + i*MAX_MAP_KEY_SIZE; + + if (i % 2 || type == BPF_MAP_TYPE_HASH_OF_MAPS) { + ret = bpf_map_delete_elem(map_fd, keyp); + CHECK(ret < 0, "bpf_map_delete_elem", + "error: key %u: %s\n", i, strerror(errno)); + } else { + ret = bpf_map_lookup_and_delete_elem(map_fd, keyp, val); + CHECK(ret < 0, "bpf_map_lookup_and_delete_elem", + "error: key %u: %s\n", i, strerror(errno)); + } + } + } + + free(keys); +} + +static bool is_lru(__u32 map_type) +{ + return map_type == BPF_MAP_TYPE_LRU_HASH || + map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH; +} + +struct upsert_opts { + __u32 map_type; + int map_fd; + __u32 n; +}; + +static int create_small_hash(void) +{ + int map_fd; + + map_fd = bpf_map_create(BPF_MAP_TYPE_HASH, "small", 4, 4, 4, NULL); + CHECK(map_fd < 0, "bpf_map_create()", "error:%s (name=%s)\n", + strerror(errno), "small"); + + return map_fd; +} + +static void *patch_map_thread(void *arg) +{ + struct upsert_opts *opts = arg; + int val; + int ret; + int i; + + for (i = 0; i < opts->n; i++) { + if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) + val = create_small_hash(); + else + val = rand(); + ret = bpf_map_update_elem(opts->map_fd, &i, &val, 0); + CHECK(ret < 0, "bpf_map_update_elem", "key=%d error: %s\n", i, strerror(errno)); + + if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) + close(val); + } + return NULL; +} + +static void upsert_elements(struct upsert_opts *opts) +{ + pthread_t threads[N_THREADS]; + int ret; + int i; + + for (i = 0; i < ARRAY_SIZE(threads); i++) { + ret = pthread_create(&i[threads], NULL, patch_map_thread, opts); + CHECK(ret != 0, "pthread_create", "error: %s\n", strerror(ret)); + } + + for (i = 0; i < ARRAY_SIZE(threads); i++) { + ret = pthread_join(i[threads], NULL); + CHECK(ret != 0, "pthread_join", "error: %s\n", strerror(ret)); + } +} + +static __u32 read_cur_elements(int iter_fd) +{ + char buf[64]; + ssize_t n; + __u32 ret; + + n = read(iter_fd, buf, sizeof(buf)-1); + CHECK(n <= 0, "read", "error: %s\n", strerror(errno)); + buf[n] = '\0'; + + errno = 0; + ret = (__u32)strtol(buf, NULL, 10); + CHECK(errno != 0, "strtol", "error: %s\n", strerror(errno)); + + return ret; +} + +static __u32 get_cur_elements(int map_id) +{ + struct map_percpu_stats *skel; + struct bpf_link *link; + __u32 n_elements; + int iter_fd; + int ret; + + skel = map_percpu_stats__open(); + CHECK(skel == NULL, "map_percpu_stats__open", "error: %s", strerror(errno)); + + skel->bss->target_id = map_id; + + ret = map_percpu_stats__load(skel); + CHECK(ret != 0, "map_percpu_stats__load", "error: %s", strerror(errno)); + + link = bpf_program__attach_iter(skel->progs.dump_bpf_map, NULL); + CHECK(!link, "bpf_program__attach_iter", "error: %s\n", strerror(errno)); + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + CHECK(iter_fd < 0, "bpf_iter_create", "error: %s\n", strerror(errno)); + + n_elements = read_cur_elements(iter_fd); + + close(iter_fd); + bpf_link__destroy(link); + map_percpu_stats__destroy(skel); + + return n_elements; +} + +static void check_expected_number_elements(__u32 n_inserted, int map_fd, + struct bpf_map_info *info) +{ + __u32 n_real; + __u32 n_iter; + + /* Count the current number of elements in the map by iterating through + * all the map keys via bpf_get_next_key + */ + n_real = map_count_elements(info->type, map_fd); + + /* The "real" number of elements should be the same as the inserted + * number of elements in all cases except LRU maps, where some elements + * may have been evicted + */ + if (n_inserted == 0 || !is_lru(info->type)) + CHECK(n_inserted != n_real, "map_count_elements", + "n_real(%u) != n_inserted(%u)\n", n_real, n_inserted); + + /* Count the current number of elements in the map using an iterator */ + n_iter = get_cur_elements(info->id); + + /* Both counts should be the same, as all updates are over */ + CHECK(n_iter != n_real, "get_cur_elements", + "n_iter=%u, expected %u (map_type=%s,map_flags=%08x)\n", + n_iter, n_real, map_type_to_s(info->type), info->map_flags); +} + +static void __test(int map_fd) +{ + struct upsert_opts opts = { + .map_fd = map_fd, + }; + struct bpf_map_info info; + + map_info(map_fd, &info); + opts.map_type = info.type; + opts.n = info.max_entries; + + /* Reduce the number of elements we are updating such that we don't + * bump into -E2BIG from non-preallocated hash maps, but still will + * have some evictions for LRU maps */ + if (opts.map_type != BPF_MAP_TYPE_HASH_OF_MAPS) + opts.n -= 512; + else + opts.n /= 2; + + /* + * Upsert keys [0, n) under some competition: with random values from + * N_THREADS threads. Check values, then delete all elements and check + * values again. + */ + upsert_elements(&opts); + check_expected_number_elements(opts.n, map_fd, &info); + delete_all_elements(info.type, map_fd, !BATCH); + check_expected_number_elements(0, map_fd, &info); + + /* Now do the same, but using batch delete operations */ + upsert_elements(&opts); + check_expected_number_elements(opts.n, map_fd, &info); + delete_all_elements(info.type, map_fd, BATCH); + check_expected_number_elements(0, map_fd, &info); + + close(map_fd); +} + +static int map_create_opts(__u32 type, const char *name, + struct bpf_map_create_opts *map_opts, + __u32 key_size, __u32 val_size) +{ + int max_entries; + int map_fd; + + if (type == BPF_MAP_TYPE_HASH_OF_MAPS) + max_entries = MAX_ENTRIES_HASH_OF_MAPS; + else + max_entries = MAX_ENTRIES; + + map_fd = bpf_map_create(type, name, key_size, val_size, max_entries, map_opts); + CHECK(map_fd < 0, "bpf_map_create()", "error:%s (name=%s)\n", + strerror(errno), name); + + return map_fd; +} + +static int map_create(__u32 type, const char *name, struct bpf_map_create_opts *map_opts) +{ + return map_create_opts(type, name, map_opts, sizeof(int), sizeof(int)); +} + +static int create_hash(void) +{ + struct bpf_map_create_opts map_opts = { + .sz = sizeof(map_opts), + .map_flags = BPF_F_NO_PREALLOC, + }; + + return map_create(BPF_MAP_TYPE_HASH, "hash", &map_opts); +} + +static int create_percpu_hash(void) +{ + struct bpf_map_create_opts map_opts = { + .sz = sizeof(map_opts), + .map_flags = BPF_F_NO_PREALLOC, + }; + + return map_create(BPF_MAP_TYPE_PERCPU_HASH, "percpu_hash", &map_opts); +} + +static int create_hash_prealloc(void) +{ + return map_create(BPF_MAP_TYPE_HASH, "hash", NULL); +} + +static int create_percpu_hash_prealloc(void) +{ + return map_create(BPF_MAP_TYPE_PERCPU_HASH, "percpu_hash_prealloc", NULL); +} + +static int create_lru_hash(__u32 type, __u32 map_flags) +{ + struct bpf_map_create_opts map_opts = { + .sz = sizeof(map_opts), + .map_flags = map_flags, + }; + + return map_create(type, "lru_hash", &map_opts); +} + +static int create_hash_of_maps(void) +{ + struct bpf_map_create_opts map_opts = { + .sz = sizeof(map_opts), + .map_flags = BPF_F_NO_PREALLOC, + .inner_map_fd = create_small_hash(), + }; + int ret; + + ret = map_create_opts(BPF_MAP_TYPE_HASH_OF_MAPS, "hash_of_maps", + &map_opts, sizeof(int), sizeof(int)); + close(map_opts.inner_map_fd); + return ret; +} + +static void map_percpu_stats_hash(void) +{ + __test(create_hash()); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_percpu_hash(void) +{ + __test(create_percpu_hash()); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_hash_prealloc(void) +{ + __test(create_hash_prealloc()); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_percpu_hash_prealloc(void) +{ + __test(create_percpu_hash_prealloc()); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_lru_hash(void) +{ + __test(create_lru_hash(BPF_MAP_TYPE_LRU_HASH, 0)); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_lru_hash_no_common(void) +{ + __test(create_lru_hash(BPF_MAP_TYPE_LRU_HASH, BPF_F_NO_COMMON_LRU)); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_percpu_lru_hash(void) +{ + __test(create_lru_hash(BPF_MAP_TYPE_LRU_PERCPU_HASH, 0)); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_percpu_lru_hash_no_common(void) +{ + __test(create_lru_hash(BPF_MAP_TYPE_LRU_PERCPU_HASH, BPF_F_NO_COMMON_LRU)); + printf("test_%s:PASS\n", __func__); +} + +static void map_percpu_stats_hash_of_maps(void) +{ + __test(create_hash_of_maps()); + printf("test_%s:PASS\n", __func__); +} + +void test_map_percpu_stats(void) +{ + map_percpu_stats_hash(); + map_percpu_stats_percpu_hash(); + map_percpu_stats_hash_prealloc(); + map_percpu_stats_percpu_hash_prealloc(); + map_percpu_stats_lru_hash(); + map_percpu_stats_lru_hash_no_common(); + map_percpu_stats_percpu_lru_hash(); + map_percpu_stats_percpu_lru_hash_no_common(); + map_percpu_stats_hash_of_maps(); +} diff --git a/tools/testing/selftests/bpf/progs/map_percpu_stats.c b/tools/testing/selftests/bpf/progs/map_percpu_stats.c new file mode 100644 index 000000000000..10b2325c1720 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/map_percpu_stats.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Isovalent */ + +#include "vmlinux.h" +#include +#include + +__u32 target_id; + +__s64 bpf_map_sum_elem_count(struct bpf_map *map) __ksym; + +SEC("iter/bpf_map") +int dump_bpf_map(struct bpf_iter__bpf_map *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + struct bpf_map *map = ctx->map; + + if (map && map->id == target_id) + BPF_SEQ_PRINTF(seq, "%lld", bpf_map_sum_elem_count(map)); + + return 0; +} + +char _license[] SEC("license") = "GPL";