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Date: Thu, 28 Apr 2022 13:59:20 -0700
From: Yonghong Song <yhs@...com>
To: Takshak Chahande <ctakshak@...com>, netdev@...r.kernel.org,
bpf@...r.kernel.org
Cc: andrii@...nel.org, ast@...nel.org, ndixit@...com, kafai@...com,
andriin@...com, daniel@...earbox.net
Subject: Re: [PATCH v3 bpf-next 2/2] selftests/bpf: handle batch operations
for map-in-map bpf-maps
On 4/25/22 11:41 AM, Takshak Chahande wrote:
> This patch adds up test cases that handles 4 combinations:
> a) outer map: BPF_MAP_TYPE_ARRAY_OF_MAPS
> inner maps: BPF_MAP_TYPE_ARRAY and BPF_MAP_TYPE_HASH
> b) outer map: BPF_MAP_TYPE_HASH_OF_MAPS
> inner maps: BPF_MAP_TYPE_ARRAY and BPF_MAP_TYPE_HASH
>
> v2->v3:
> - Handled transient ENOSPC correctly, bug was found in BPF CI (Daniel)
>
> v1->v2:
> - Fixed no format arguments error (Andrii)
Please put the above version changes between
create mode 100644
tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c
and
diff --git
a/tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c ...
So they won't appear in the commit message when the patch
is merged. The same for patch #1.
>
> Signed-off-by: Takshak Chahande <ctakshak@...com>
Ack with a few nits below.
Acked-by: Yonghong Song <yhs@...com>
> ---
> .../bpf/map_tests/map_in_map_batch_ops.c | 239 ++++++++++++++++++
> 1 file changed, 239 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c
>
> diff --git a/tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c b/tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c
> new file mode 100644
> index 000000000000..f1eee580ba2e
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/map_tests/map_in_map_batch_ops.c
> @@ -0,0 +1,239 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <stdio.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <unistd.h>
> +
> +#include <bpf/bpf.h>
> +#include <bpf/libbpf.h>
> +
> +#include <test_maps.h>
> +
> +#define OUTER_MAP_ENTRIES 10
> +
> +static __u32 get_map_id_from_fd(int map_fd)
> +{
> + struct bpf_map_info map_info = {};
> + uint32_t info_len = sizeof(map_info);
> + int ret;
> +
> + ret = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
> + CHECK(ret < 0, "Finding map info failed", "error:%s\n",
> + strerror(errno));
> +
> + return map_info.id;
> +}
> +
> +/* This creates number of OUTER_MAP_ENTRIES maps that will be stored
> + * in outer map and return the created map_fds
> + */
> +static void create_inner_maps(enum bpf_map_type map_type,
> + __u32 *inner_map_fds)
> +{
> + int map_fd, map_index, ret;
> + __u32 map_key = 0, map_id;
> + char map_name[15];
> +
> + for (map_index = 0; map_index < OUTER_MAP_ENTRIES; map_index++) {
> + memset(map_name, 0, sizeof(map_name));
> + sprintf(map_name, "inner_map_fd_%d", map_index);
> + map_fd = bpf_map_create(map_type, map_name, sizeof(__u32),
> + sizeof(__u32), 1, NULL);
> + CHECK(map_fd < 0,
> + "inner bpf_map_create() failed",
> + "map_type=(%d) map_name(%s), error:%s\n",
> + map_type, map_name, strerror(errno));
> +
> + /* keep track of the inner map fd as it is required
> + * to add records in outer map
> + */
> + inner_map_fds[map_index] = map_fd;
> +
> + /* Add entry into this created map
> + * eg: map1 key = 0, value = map1's map id
> + * map2 key = 0, value = map2's map id
> + */
> + map_id = get_map_id_from_fd(map_fd);
> + ret = bpf_map_update_elem(map_fd, &map_key, &map_id, 0);
> + CHECK(ret != 0,
> + "bpf_map_update_elem failed",
> + "map_type=(%d) map_name(%s), error:%s\n",
> + map_type, map_name, strerror(errno));
> + }
> +}
> +
> +static int create_outer_map(enum bpf_map_type map_type, __u32 inner_map_fd)
> +{
> + int outer_map_fd;
> +
Remove the empty line in the above.
> + LIBBPF_OPTS(bpf_map_create_opts, attr);
LIBBPF_OPTS is a declaration. So put an empty line here.
> + attr.inner_map_fd = inner_map_fd;
> + outer_map_fd = bpf_map_create(map_type, "outer_map", sizeof(__u32),
> + sizeof(__u32), OUTER_MAP_ENTRIES,
> + &attr);
> + CHECK(outer_map_fd < 0,
> + "outer bpf_map_create()",
> + "map_type=(%d), error:%s\n",
> + map_type, strerror(errno));
> +
> + return outer_map_fd;
> +}
> +
> +static void validate_fetch_results(int outer_map_fd, __u32 *inner_map_fds,
> + __u32 *fetched_keys, __u32 *fetched_values,
> + __u32 max_entries_fetched)
> +{
> + __u32 inner_map_key, inner_map_value;
> + int inner_map_fd, entry, err;
> + __u32 outer_map_value;
> +
> + for (entry = 0; entry < max_entries_fetched; ++entry) {
> + outer_map_value = fetched_values[entry];
> + inner_map_fd = bpf_map_get_fd_by_id(outer_map_value);
> + CHECK(inner_map_fd < 0,
> + "Failed to get inner map fd",
> + "from id(%d), error=%s\n",
> + outer_map_value, strerror(errno));
> + err = bpf_map_get_next_key(inner_map_fd, NULL, &inner_map_key);
> + CHECK(err != 0,
> + "Failed to get inner map key",
> + "error=%s\n", strerror(errno));
> +
> + err = bpf_map_lookup_elem(inner_map_fd, &inner_map_key,
> + &inner_map_value);
> + CHECK(err != 0,
> + "Failed to get inner map value",
> + "for key(%d), error=%s\n",
> + inner_map_key, strerror(errno));
> +
> + /* Actual value validation */
> + CHECK(outer_map_value != inner_map_value,
> + "Failed to validate inner map value",
> + "fetched(%d) and lookedup(%d)!\n",
> + outer_map_value, inner_map_value);
> + }
> +}
> +
> +static void fetch_and_validate(int outer_map_fd,
> + __u32 *inner_map_fds,
> + struct bpf_map_batch_opts *opts,
> + __u32 batch_size, bool delete_entries)
> +{
> + __u32 *fetched_keys, *fetched_values, total_fetched = 0;
> + __u32 batch_key = 0, fetch_count, step_size;
> + int err, max_entries = OUTER_MAP_ENTRIES;
> + __u32 value_size = sizeof(__u32);
> +
> + /* Total entries needs to be fetched */
> + fetched_keys = calloc(max_entries, value_size);
> + fetched_values = calloc(max_entries, value_size);
Just for completeness, should we check whether either of
fetched_keys or fetched_values is NULL or not?
> +
> + for (step_size = batch_size; step_size <= max_entries; step_size += batch_size) {
> + fetch_count = step_size;
> + err = delete_entries
> + ? bpf_map_lookup_and_delete_batch(outer_map_fd,
> + total_fetched ? &batch_key : NULL,
> + &batch_key,
> + fetched_keys + total_fetched,
> + fetched_values + total_fetched,
> + &fetch_count, opts)
> + : bpf_map_lookup_batch(outer_map_fd,
> + total_fetched ? &batch_key : NULL,
> + &batch_key,
> + fetched_keys + total_fetched,
> + fetched_values + total_fetched,
> + &fetch_count, opts);
> +
> + if (err && errno == ENOSPC) {
> + /* Fetch again with higher batch size */
> + total_fetched = 0;
> + continue;
> + }
> +
> + CHECK((err < 0 && (errno != ENOENT)),
> + "lookup with steps failed",
> + "error: %s\n", strerror(errno));
> +
> + /* Update the total fetched number */
> + total_fetched += fetch_count;
> + if (err)
> + break;
> + }
> +
> + CHECK((total_fetched != max_entries),
> + "Unable to fetch expected entries !",
> + "total_fetched(%d) and max_entries(%d) error: (%d):%s\n",
> + total_fetched, max_entries, errno, strerror(errno));
> +
> + /* validate the fetched entries */
> + validate_fetch_results(outer_map_fd, inner_map_fds, fetched_keys,
> + fetched_values, total_fetched);
> + printf("batch_op(%s) is successful with batch_size(%d)\n",
> + delete_entries ? "LOOKUP_AND_DELETE" : "LOOKUP", batch_size);
indentation issue?
> +
> + free(fetched_keys);
> + free(fetched_values);
> +}
> +
> +static void _map_in_map_batch_ops(enum bpf_map_type outer_map_type,
> + enum bpf_map_type inner_map_type)
> +{
> + __u32 *outer_map_keys, *inner_map_fds;
> + __u32 max_entries = OUTER_MAP_ENTRIES;
> + __u32 value_size = sizeof(__u32);
> + int batch_size[2] = {5, 10};
> + __u32 map_index, op_index;
> + int outer_map_fd, ret;
> + DECLARE_LIBBPF_OPTS(bpf_map_batch_opts, opts,
> + .elem_flags = 0,
> + .flags = 0,
> + );
Do we need this opts, why not just NULL pointer for opts?
> +
> + outer_map_keys = calloc(max_entries, value_size);
> + inner_map_fds = calloc(max_entries, value_size);
check whether outer_map_keys or inner_map_fds is NULL or not?
> + create_inner_maps(inner_map_type, inner_map_fds);
> +
> + outer_map_fd = create_outer_map(outer_map_type, *inner_map_fds);
> + /* create outer map keys */
> + for (map_index = 0; map_index < max_entries; map_index++)
> + outer_map_keys[map_index] =
> + ((outer_map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
> + ? 9 : 1000) - map_index;
> +
> + /* batch operation - map_update */
> + ret = bpf_map_update_batch(outer_map_fd, outer_map_keys,
> + inner_map_fds, &max_entries, &opts);
> + CHECK(ret != 0,
> + "Failed to update the outer map batch ops",
> + "error=%s\n", strerror(errno));
> +
> + /* batch operation - map_lookup */
> + for (op_index = 0; op_index < 2; ++op_index)
> + fetch_and_validate(outer_map_fd, inner_map_fds, &opts,
> + batch_size[op_index], false);
> +
> + /* batch operation - map_lookup_delete */
> + if (outer_map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
> + fetch_and_validate(outer_map_fd, inner_map_fds, &opts,
> + max_entries, true /*delete*/);
> +
> + free(inner_map_fds);
> + free(outer_map_keys);
> +}
[...]
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