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0087a681fa
linux/tools/lib/bpf
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Andrii Nakryiko 0087a681fa libbpf: Automatically fix up BPF_MAP_TYPE_RINGBUF size, if necessary 
Kernel imposes a pretty particular restriction on ringbuf map size. It
has to be a power-of-2 multiple of page size. While generally this isn't
hard for user to satisfy, sometimes it's impossible to do this
declaratively in BPF source code or just plain inconvenient to do at
runtime.

One such example might be BPF libraries that are supposed to work on
different architectures, which might not agree on what the common page
size is.

Let libbpf find the right size for user instead, if it turns out to not
satisfy kernel requirements. If user didn't set size at all, that's most
probably a mistake so don't upsize such zero size to one full page,
though. Also we need to be careful about not overflowing __u32
max_entries.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220509004148.1801791-9-andrii@kernel.org
2022-05-09 17:15:32 +02:00
..
.gitignore libbpf: Make libbpf_version.h non-auto-generated 2021-09-13 15:36:47 -07:00
bpf_core_read.h libbpf: Complete field-based CO-RE helpers with field offset helper 2022-05-09 17:15:32 +02:00
bpf_endian.h libbpf: Make bpf_endian co-exist with vmlinux.h 2020-07-01 09:06:12 +02:00
bpf_gen_internal.h Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-10 15:56:13 -08:00
bpf_helpers.h libbpf: Provide barrier() and barrier_var() in bpf_helpers.h 2022-05-09 17:15:32 +02:00
bpf_prog_linfo.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
bpf_tracing.h libbpf: Add ARC support to bpf_tracing.h 2022-04-10 18:53:37 -07:00
bpf.c libbpf: Teach bpf_link_create() to fallback to bpf_raw_tracepoint_open() 2022-04-23 00:37:02 +02:00
bpf.h libbpf: Add bpf_link_create support for multi kprobes 2022-03-17 20:17:19 -07:00
btf_dump.c libbpf: Skip forward declaration when counting duplicated type names 2022-03-01 13:40:57 +01:00
btf.c libbpf: Avoid joining .BTF.ext data with BPF programs by section name 2022-04-26 15:41:46 -07:00
btf.h libbpf: Deprecate forgotten btf__get_map_kv_tids() 2022-02-04 01:07:16 +01:00
Build libbpf: Wire up USDT API and bpf_link integration 2022-04-05 13:16:07 -07:00
gen_loader.c libbpf: Prepare light skeleton for the kernel. 2022-02-10 23:31:51 +01:00
hashmap.c libbpf: Use IS_ERR_OR_NULL() in hashmap__free() 2022-01-12 17:01:36 -08:00
hashmap.h libbpf, hashmap: Fix undefined behavior in hash_bits 2020-11-02 23:33:51 +01:00
libbpf_common.h libbpf: Deprecate bpf_prog_load_xattr() API 2021-12-02 15:23:41 -08:00
libbpf_errno.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
libbpf_internal.h libbpf: Avoid joining .BTF.ext data with BPF programs by section name 2022-04-26 15:41:46 -07:00
libbpf_legacy.h libbpf: .text routines are subprograms in strict mode 2022-03-17 23:11:15 -07:00
libbpf_probes.c libbpf: Improve LINUX_VERSION_CODE detection 2021-12-28 19:20:31 -08:00
libbpf_version.h libbpf: Support custom SEC() handlers 2022-03-05 09:38:15 -08:00
libbpf.c libbpf: Automatically fix up BPF_MAP_TYPE_RINGBUF size, if necessary 2022-05-09 17:15:32 +02:00
libbpf.h libbpf: Allow to opt-out from creating BPF maps 2022-04-28 20:03:29 -07:00
libbpf.map libbpf: Allow to opt-out from creating BPF maps 2022-04-28 20:03:29 -07:00
libbpf.pc.template libbpf: Add zlib as a dependency in pkg-config template 2019-12-16 14:55:29 -08:00
linker.c libbpf: Fix using invalidated memory in bpf_linker 2021-11-26 00:15:03 +01:00
Makefile Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-04-08 17:07:29 -07:00
netlink.c libbpf: Fix memleak in libbpf_netlink_recv() 2022-02-17 16:09:07 +01:00
nlattr.c libbpf: Switch to void * casting in netlink helpers 2021-06-22 17:04:02 +02:00
nlattr.h libbpf: Switch to void * casting in netlink helpers 2021-06-22 17:04:02 +02:00
relo_core.c libbpf: Fix up verifier log for unguarded failed CO-RE relos 2022-04-26 15:41:46 -07:00
relo_core.h libbpf: Fix up verifier log for unguarded failed CO-RE relos 2022-04-26 15:41:46 -07:00
ringbuf.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
skel_internal.h libbpf: Prepare light skeleton for the kernel. 2022-02-10 23:31:51 +01:00
str_error.c libbpf: Poison kernel-only integer types 2020-01-10 10:38:00 -08:00
str_error.h
strset.c libbpf: Fix memory leak in strset 2021-10-01 22:54:38 +02:00
strset.h libbpf: Extract internal set-of-strings datastructure APIs 2021-03-18 16:14:22 -07:00
usdt.bpf.h libbpf: Use weak hidden modifier for USDT BPF-side API functions 2022-04-08 22:24:15 +02:00
usdt.c libbpf: Support riscv USDT argument parsing logic 2022-04-19 21:59:35 -07:00
xsk.c libbpf: Fix array_size.cocci warning 2022-03-07 22:13:00 -08:00
xsk.h libbpf: Deprecate AF_XDP support 2021-11-01 18:12:44 -07:00