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Thu, 23 May 2019 09:04:44 -0700 (PDT) Date: Thu, 23 May 2019 09:04:43 -0700 From: Stanislav Fomichev To: Andrii Nakryiko Cc: Andrii Nakryiko , Alexei Starovoitov , Daniel Borkmann , Networking , bpf@vger.kernel.org, Kernel Team Subject: Re: [PATCH bpf-next 06/12] selftests/bpf: add tests for libbpf's hashmap Message-ID: <20190523160443.GD3032@mini-arch> References: <20190522195053.4017624-1-andriin@fb.com> <20190522195053.4017624-7-andriin@fb.com> <20190522203146.GP10244@mini-arch> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 05/22, Andrii Nakryiko wrote: > On Wed, May 22, 2019 at 3:15 PM Andrii Nakryiko > wrote: > > > > On Wed, May 22, 2019 at 1:31 PM Stanislav Fomichev wrote: > > > > > > On 05/22, Andrii Nakryiko wrote: > > > > Test all APIs for internal hashmap implementation. > > > > > > > > Signed-off-by: Andrii Nakryiko > > > > --- > > > > tools/testing/selftests/bpf/.gitignore | 1 + > > > > tools/testing/selftests/bpf/Makefile | 2 +- > > > > tools/testing/selftests/bpf/test_hashmap.c | 382 +++++++++++++++++++++ > > > > 3 files changed, 384 insertions(+), 1 deletion(-) > > > > create mode 100644 tools/testing/selftests/bpf/test_hashmap.c > > > > > > > > diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore > > > > index dd5d69529382..138b6c063916 100644 > > > > --- a/tools/testing/selftests/bpf/.gitignore > > > > +++ b/tools/testing/selftests/bpf/.gitignore > > > > @@ -35,3 +35,4 @@ test_sysctl > > > > alu32 > > > > libbpf.pc > > > > libbpf.so.* > > > > +test_hashmap > > > > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile > > > > index 66f2dca1dee1..ddae06498a00 100644 > > > > --- a/tools/testing/selftests/bpf/Makefile > > > > +++ b/tools/testing/selftests/bpf/Makefile > > > > @@ -23,7 +23,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test > > > > test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \ > > > > test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user \ > > > > test_socket_cookie test_cgroup_storage test_select_reuseport test_section_names \ > > > > - test_netcnt test_tcpnotify_user test_sock_fields test_sysctl > > > > + test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap > > > > > > > > BPF_OBJ_FILES = $(patsubst %.c,%.o, $(notdir $(wildcard progs/*.c))) > > > > TEST_GEN_FILES = $(BPF_OBJ_FILES) > > > > diff --git a/tools/testing/selftests/bpf/test_hashmap.c b/tools/testing/selftests/bpf/test_hashmap.c > > > > new file mode 100644 > > > > index 000000000000..b64094c981e3 > > > > --- /dev/null > > > [..] > > > > +++ b/tools/testing/selftests/bpf/test_hashmap.c > > > Any reason against putting it in bpf/prog_tests? No need for your own > > > CHECK macro and no Makefile changes. > > > > I didn't know they are special and I assumed they are mostly for > > loading BPF programs and testing them. I'll check that set up and will > > move there, if it makes sense. > > Seems like my assumption was right. I converted these hashmap tests to > progs_test, and each CHECK usage emits either SUCCESS or FAIL message, > spamming output like this: > > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > test_hashmap_generic:PASS:test_hashmap_generic 0 nsec > > > CHECK also expects __u32 duration to be in the scope, so I need to add > it just to make macro happy. > > It feels like at the moment this "framework" is not yet well-suited > for generic tests, but more towards loading BPF program and checking > (once per BPF program) that everything went fine. I'll keep it as is > for now. It won't be hard to convert it into prog_tests, once we > develop it a bit more. Oh, yeah, it's mostly for the tests which do bpf_prog_test_run. Might not be a good fit if you're not loading any bpf progs, agreed. > > > > @@ -0,0 +1,382 @@ > > > > +// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) > > > > + > > > > +/* > > > > + * Tests for libbpf's hashmap. > > > > + * > > > > + * Copyright (c) 2019 Facebook > > > > + */ > > > > +#include > > > > +#include > > > > +#include > > > > +#include "hashmap.h" > > > > + > > > > +#define CHECK(condition, format...) ({ \ > > > > + int __ret = !!(condition); \ > > > > + if (__ret) { \ > > > > + fprintf(stderr, "%s:%d:FAIL ", __func__, __LINE__); \ > > > > + fprintf(stderr, format); \ > > > > + } \ > > > > + __ret; \ > > > > +}) > > > > + > > > > +size_t hash_fn(const void *k, void *ctx) > > > > +{ > > > > + return (long)k; > > > > +} > > > > + > > > > +bool equal_fn(const void *a, const void *b, void *ctx) > > > > +{ > > > > + return (long)a == (long)b; > > > > +} > > > > + > > > > +static inline size_t next_pow_2(size_t n) > > > > +{ > > > > + size_t r = 1; > > > > + > > > > + while (r < n) > > > > + r <<= 1; > > > > + return r; > > > > +} > > > > + > > > > +static inline size_t exp_cap(size_t sz) > > > > +{ > > > > + size_t r = next_pow_2(sz); > > > > + > > > > + if (sz * 4 / 3 > r) > > > > + r <<= 1; > > > > + return r; > > > > +} > > > > + > > > > +#define ELEM_CNT 62 > > > > + > > > > +int test_hashmap_generic(void) > > > > +{ > > > > + struct hashmap_entry *entry, *tmp; > > > > + int err, bkt, found_cnt, i; > > > > + long long found_msk; > > > > + struct hashmap *map; > > > > + > > > > + fprintf(stderr, "%s: ", __func__); > > > > + > > > > + map = hashmap__new(hash_fn, equal_fn, NULL); > > > > + if (CHECK(IS_ERR(map), "failed to create map: %ld\n", PTR_ERR(map))) > > > > + return 1; > > > > + > > > > + for (i = 0; i < ELEM_CNT; i++) { > > > > + const void *oldk, *k = (const void *)(long)i; > > > > + void *oldv, *v = (void *)(long)(1024 + i); > > > > + > > > > + err = hashmap__update(map, k, v, &oldk, &oldv); > > > > + if (CHECK(err != -ENOENT, "unexpected result: %d\n", err)) > > > > + return 1; > > > > + > > > > + if (i % 2) { > > > > + err = hashmap__add(map, k, v); > > > > + } else { > > > > + err = hashmap__set(map, k, v, &oldk, &oldv); > > > > + if (CHECK(oldk != NULL || oldv != NULL, > > > > + "unexpected k/v: %p=%p\n", oldk, oldv)) > > > > + return 1; > > > > + } > > > > + > > > > + if (CHECK(err, "failed to add k/v %ld = %ld: %d\n", > > > > + (long)k, (long)v, err)) > > > > + return 1; > > > > + > > > > + if (CHECK(!hashmap__find(map, k, &oldv), > > > > + "failed to find key %ld\n", (long)k)) > > > > + return 1; > > > > + if (CHECK(oldv != v, "found value is wrong: %ld\n", (long)oldv)) > > > > + return 1; > > > > + } > > > > + > > > > + if (CHECK(hashmap__size(map) != ELEM_CNT, > > > > + "invalid map size: %zu\n", hashmap__size(map))) > > > > + return 1; > > > > + if (CHECK(hashmap__capacity(map) != exp_cap(hashmap__size(map)), > > > > + "unexpected map capacity: %zu\n", hashmap__capacity(map))) > > > > + return 1; > > > > + > > > > + found_msk = 0; > > > > + hashmap__for_each_entry(map, entry, bkt) { > > > > + long k = (long)entry->key; > > > > + long v = (long)entry->value; > > > > + > > > > + found_msk |= 1ULL << k; > > > > + if (CHECK(v - k != 1024, "invalid k/v pair: %ld = %ld\n", k, v)) > > > > + return 1; > > > > + } > > > > + if (CHECK(found_msk != (1ULL << ELEM_CNT) - 1, > > > > + "not all keys iterated: %llx\n", found_msk)) > > > > + return 1; > > > > + > > > > + for (i = 0; i < ELEM_CNT; i++) { > > > > + const void *oldk, *k = (const void *)(long)i; > > > > + void *oldv, *v = (void *)(long)(256 + i); > > > > + > > > > + err = hashmap__add(map, k, v); > > > > + if (CHECK(err != -EEXIST, "unexpected add result: %d\n", err)) > > > > + return 1; > > > > + > > > > + if (i % 2) > > > > + err = hashmap__update(map, k, v, &oldk, &oldv); > > > > + else > > > > + err = hashmap__set(map, k, v, &oldk, &oldv); > > > > + > > > > + if (CHECK(err, "failed to update k/v %ld = %ld: %d\n", > > > > + (long)k, (long)v, err)) > > > > + return 1; > > > > + if (CHECK(!hashmap__find(map, k, &oldv), > > > > + "failed to find key %ld\n", (long)k)) > > > > + return 1; > > > > + if (CHECK(oldv != v, "found value is wrong: %ld\n", (long)oldv)) > > > > + return 1; > > > > + } > > > > + > > > > + if (CHECK(hashmap__size(map) != ELEM_CNT, > > > > + "invalid updated map size: %zu\n", hashmap__size(map))) > > > > + return 1; > > > > + if (CHECK(hashmap__capacity(map) != exp_cap(hashmap__size(map)), > > > > + "unexpected map capacity: %zu\n", hashmap__capacity(map))) > > > > + return 1; > > > > + > > > > + found_msk = 0; > > > > + hashmap__for_each_entry_safe(map, entry, tmp, bkt) { > > > > + long k = (long)entry->key; > > > > + long v = (long)entry->value; > > > > + > > > > + found_msk |= 1ULL << k; > > > > + if (CHECK(v - k != 256, > > > > + "invalid updated k/v pair: %ld = %ld\n", k, v)) > > > > + return 1; > > > > + } > > > > + if (CHECK(found_msk != (1ULL << ELEM_CNT) - 1, > > > > + "not all keys iterated after update: %llx\n", found_msk)) > > > > + return 1; > > > > + > > > > + found_cnt = 0; > > > > + hashmap__for_each_key_entry(map, entry, (void *)0) { > > > > + found_cnt++; > > > > + } > > > > + if (CHECK(!found_cnt, "didn't find any entries for key 0\n")) > > > > + return 1; > > > > + > > > > + found_msk = 0; > > > > + found_cnt = 0; > > > > + hashmap__for_each_key_entry_safe(map, entry, tmp, (void *)0) { > > > > + const void *oldk, *k; > > > > + void *oldv, *v; > > > > + > > > > + k = entry->key; > > > > + v = entry->value; > > > > + > > > > + found_cnt++; > > > > + found_msk |= 1ULL << (long)k; > > > > + > > > > + if (CHECK(!hashmap__delete(map, k, &oldk, &oldv), > > > > + "failed to delete k/v %ld = %ld\n", > > > > + (long)k, (long)v)) > > > > + return 1; > > > > + if (CHECK(oldk != k || oldv != v, > > > > + "invalid deleted k/v: expected %ld = %ld, got %ld = %ld\n", > > > > + (long)k, (long)v, (long)oldk, (long)oldv)) > > > > + return 1; > > > > + if (CHECK(hashmap__delete(map, k, &oldk, &oldv), > > > > + "unexpectedly deleted k/v %ld = %ld\n", > > > > + (long)oldk, (long)oldv)) > > > > + return 1; > > > > + } > > > > + > > > > + if (CHECK(!found_cnt || !found_msk, > > > > + "didn't delete any key entries\n")) > > > > + return 1; > > > > + if (CHECK(hashmap__size(map) != ELEM_CNT - found_cnt, > > > > + "invalid updated map size (already deleted: %d): %zu\n", > > > > + found_cnt, hashmap__size(map))) > > > > + return 1; > > > > + if (CHECK(hashmap__capacity(map) != exp_cap(hashmap__size(map)), > > > > + "unexpected map capacity: %zu\n", hashmap__capacity(map))) > > > > + return 1; > > > > + > > > > + hashmap__for_each_entry_safe(map, entry, tmp, bkt) { > > > > + const void *oldk, *k; > > > > + void *oldv, *v; > > > > + > > > > + k = entry->key; > > > > + v = entry->value; > > > > + > > > > + found_cnt++; > > > > + found_msk |= 1ULL << (long)k; > > > > + > > > > + if (CHECK(!hashmap__delete(map, k, &oldk, &oldv), > > > > + "failed to delete k/v %ld = %ld\n", > > > > + (long)k, (long)v)) > > > > + return 1; > > > > + if (CHECK(oldk != k || oldv != v, > > > > + "invalid old k/v: expect %ld = %ld, got %ld = %ld\n", > > > > + (long)k, (long)v, (long)oldk, (long)oldv)) > > > > + return 1; > > > > + if (CHECK(hashmap__delete(map, k, &oldk, &oldv), > > > > + "unexpectedly deleted k/v %ld = %ld\n", > > > > + (long)k, (long)v)) > > > > + return 1; > > > > + } > > > > + > > > > + if (CHECK(found_cnt != ELEM_CNT || found_msk != (1ULL << ELEM_CNT) - 1, > > > > + "not all keys were deleted: found_cnt:%d, found_msk:%llx\n", > > > > + found_cnt, found_msk)) > > > > + return 1; > > > > + if (CHECK(hashmap__size(map) != 0, > > > > + "invalid updated map size (already deleted: %d): %zu\n", > > > > + found_cnt, hashmap__size(map))) > > > > + return 1; > > > > + > > > > + found_cnt = 0; > > > > + hashmap__for_each_entry(map, entry, bkt) { > > > > + CHECK(false, "unexpected map entries left: %ld = %ld\n", > > > > + (long)entry->key, (long)entry->value); > > > > + return 1; > > > > + } > > > > + > > > > + hashmap__free(map); > > > > + hashmap__for_each_entry(map, entry, bkt) { > > > > + CHECK(false, "unexpected map entries left: %ld = %ld\n", > > > > + (long)entry->key, (long)entry->value); > > > > + return 1; > > > > + } > > > > + > > > > + fprintf(stderr, "OK\n"); > > > > + return 0; > > > > +} > > > > + > > > > +size_t collision_hash_fn(const void *k, void *ctx) > > > > +{ > > > > + return 0; > > > > +} > > > > + > > > > +int test_hashmap_multimap(void) > > > > +{ > > > > + void *k1 = (void *)0, *k2 = (void *)1; > > > > + struct hashmap_entry *entry; > > > > + struct hashmap *map; > > > > + long found_msk; > > > > + int err, bkt; > > > > + > > > > + fprintf(stderr, "%s: ", __func__); > > > > + > > > > + /* force collisions */ > > > > + map = hashmap__new(collision_hash_fn, equal_fn, NULL); > > > > + if (CHECK(IS_ERR(map), "failed to create map: %ld\n", PTR_ERR(map))) > > > > + return 1; > > > > + > > > > + > > > > + /* set up multimap: > > > > + * [0] -> 1, 2, 4; > > > > + * [1] -> 8, 16, 32; > > > > + */ > > > > + err = hashmap__append(map, k1, (void *)1); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + err = hashmap__append(map, k1, (void *)2); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + err = hashmap__append(map, k1, (void *)4); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + > > > > + err = hashmap__append(map, k2, (void *)8); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + err = hashmap__append(map, k2, (void *)16); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + err = hashmap__append(map, k2, (void *)32); > > > > + if (CHECK(err, "failed to add k/v: %d\n", err)) > > > > + return 1; > > > > + > > > > + if (CHECK(hashmap__size(map) != 6, > > > > + "invalid map size: %zu\n", hashmap__size(map))) > > > > + return 1; > > > > + > > > > + /* verify global iteration still works and sees all values */ > > > > + found_msk = 0; > > > > + hashmap__for_each_entry(map, entry, bkt) { > > > > + found_msk |= (long)entry->value; > > > > + } > > > > + if (CHECK(found_msk != (1 << 6) - 1, > > > > + "not all keys iterated: %lx\n", found_msk)) > > > > + return 1; > > > > + > > > > + /* iterate values for key 1 */ > > > > + found_msk = 0; > > > > + hashmap__for_each_key_entry(map, entry, k1) { > > > > + found_msk |= (long)entry->value; > > > > + } > > > > + if (CHECK(found_msk != (1 | 2 | 4), > > > > + "invalid k1 values: %lx\n", found_msk)) > > > > + return 1; > > > > + > > > > + /* iterate values for key 2 */ > > > > + found_msk = 0; > > > > + hashmap__for_each_key_entry(map, entry, k2) { > > > > + found_msk |= (long)entry->value; > > > > + } > > > > + if (CHECK(found_msk != (8 | 16 | 32), > > > > + "invalid k2 values: %lx\n", found_msk)) > > > > + return 1; > > > > + > > > > + fprintf(stderr, "OK\n"); > > > > + return 0; > > > > +} > > > > + > > > > +int test_hashmap_empty() > > > > +{ > > > > + struct hashmap_entry *entry; > > > > + int bkt; > > > > + struct hashmap *map; > > > > + void *k = (void *)0; > > > > + > > > > + fprintf(stderr, "%s: ", __func__); > > > > + > > > > + /* force collisions */ > > > > + map = hashmap__new(hash_fn, equal_fn, NULL); > > > > + if (CHECK(IS_ERR(map), "failed to create map: %ld\n", PTR_ERR(map))) > > > > + return 1; > > > > + > > > > + if (CHECK(hashmap__size(map) != 0, > > > > + "invalid map size: %zu\n", hashmap__size(map))) > > > > + return 1; > > > > + if (CHECK(hashmap__capacity(map) != 0, > > > > + "invalid map capacity: %zu\n", hashmap__capacity(map))) > > > > + return 1; > > > > + if (CHECK(hashmap__find(map, k, NULL), "unexpected find\n")) > > > > + return 1; > > > > + if (CHECK(hashmap__delete(map, k, NULL, NULL), "unexpected delete\n")) > > > > + return 1; > > > > + > > > > + hashmap__for_each_entry(map, entry, bkt) { > > > > + CHECK(false, "unexpected iterated entry\n"); > > > > + return 1; > > > > + } > > > > + hashmap__for_each_key_entry(map, entry, k) { > > > > + CHECK(false, "unexpected key entry\n"); > > > > + return 1; > > > > + } > > > > + > > > > + fprintf(stderr, "OK\n"); > > > > + return 0; > > > > +} > > > > + > > > > +int main(int argc, char **argv) > > > > +{ > > > > + bool failed = false; > > > > + > > > > + if (test_hashmap_generic()) > > > > + failed = true; > > > > + if (test_hashmap_multimap()) > > > > + failed = true; > > > > + if (test_hashmap_empty()) > > > > + failed = true; > > > > + > > > > + return failed; > > > > +} > > > > -- > > > > 2.17.1 > > > >