netdev - [PATCH bpf-next v4 0/3] Add kernel symbol for struct

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Message-Id: <20241112145849.3436772-1-xukuohai@huaweicloud.com>
Date: Tue, 12 Nov 2024 22:58:46 +0800
From: Xu Kuohai <xukuohai@...weicloud.com>
To: bpf@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Kui-Feng Lee <thinker.li@...il.com>
Subject: [PATCH bpf-next v4 0/3] Add kernel symbol for struct_ops trampoline

Add kernel symbol for struct_ops trampoline.

Without kernel symbol for struct_ops trampoline, the unwinder may
produce unexpected stacktraces. For example, the x86 ORC and FP
unwinder stops stacktrace on a struct_ops trampoline address since
there is no kernel symbol for the address.

v4:
- Add a separate cleanup patch to remove unused member rcu from
  bpf_struct_ops_map (patch 1)
- Use funcs_cnt instead of btf_type_vlen(vt) for links memory
  calculation in .map_mem_usage (patch 2)
- Include ksyms[] memory in map_mem_usage (patch 3)
- Various fixes in patch 3 (Thanks to Martin)

v3: https://lore.kernel.org/bpf/20241111121641.2679885-1-xukuohai@huaweicloud.com/
- Add a separate cleanup patch to replace links_cnt with funcs_cnt
- Allocate ksyms on-demand in update_elem() to stay with the links
  allocation way
- Set ksym name to prog__<struct_ops_name>_<member_name>

v2: https://lore.kernel.org/bpf/20241101111948.1570547-1-xukuohai@huaweicloud.com/
- Refine the commit message for clarity and fix a test bot warning

v1: https://lore.kernel.org/bpf/20241030111533.907289-1-xukuohai@huaweicloud.com/

Xu Kuohai (3):
  bpf: Remove unused member rcu from bpf_struct_ops_map
  bpf: Use function pointers count as struct_ops links count
  bpf: Add kernel symbol for struct_ops trampoline

 include/linux/bpf.h         |   3 +-
 kernel/bpf/bpf_struct_ops.c | 115 ++++++++++++++++++++++++++++++++----
 kernel/bpf/dispatcher.c     |   3 +-
 kernel/bpf/trampoline.c     |   9 ++-
 4 files changed, 114 insertions(+), 16 deletions(-)

-- 
2.39.5