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libbpf: Use page size as max_entries when probing ring buffer map

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[ Upstream commit 689eb2f1ba ]

Using page size as max_entries when probing ring buffer map, else the
probe may fail on host with 64KB page size (e.g., an ARM64 host).

After the fix, the output of "bpftool feature" on above host will be
correct.

Before :
    eBPF map_type ringbuf is NOT available
    eBPF map_type user_ringbuf is NOT available

After :
    eBPF map_type ringbuf is available
    eBPF map_type user_ringbuf is available

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221116072351.1168938-2-houtao@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hou Tao 2022-11-16 15:23:48 +08:00 committed by Greg Kroah-Hartman
parent 1798b62d64
commit 0a81076a36
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/libbpf_probes.c
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@ -233,7 +233,7 @@ static int probe_map_create(enum bpf_map_type map_type)
case BPF_MAP_TYPE_RINGBUF:
key_size = 0;
value_size = 0;
max_entries = 4096;
max_entries = sysconf(_SC_PAGE_SIZE);
break;
case BPF_MAP_TYPE_STRUCT_OPS:
/* we'll get -ENOTSUPP for invalid BTF type ID for struct_ops */