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  1. 04 Mar, 2024 5 commits
  3. 03 Mar, 2024 2 commits
    • Dave Thaler's avatar
      bpf, docs: Use IETF format for field definitions in instruction-set.rst · 4e73e1bc
      Dave Thaler authored 
      In preparation for publication as an IETF RFC, the WG chairs asked me
to convert the document to use IETF packet format for field layout, so
this patch attempts to make it consistent with other IETF documents.

Some fields that are not byte aligned were previously inconsistent
in how values were defined.  Some were defined as the value of the
byte containing the field (like 0x20 for a field holding the high
four bits of the byte), and others were defined as the value of the
field itself (like 0x2).  This PR makes them be consistent in using
just the values of the field itself, which is IETF convention.

As a result, some of the defines that used BPF_* would no longer
match the value in the spec, and so this patch also drops the BPF_*
prefix to avoid confusion with the defines that are the full-byte
equivalent values.  For consistency, BPF_* is then dropped from
other fields too.  BPF_<foo> is thus the Linux implementation-specific
define for <foo> as it appears in the BPF ISA specification.

The syntax BPF_ADD | BPF_X | BPF_ALU only worked for full-byte
values so the convention {ADD, X, ALU} is proposed for referring
to field values instead.

Also replace the redundant "LSB bits" with "least significant bits".

A preview of what the resulting Internet Draft would look like can
be seen at:
https://htmlpreview.github.io/?https://raw.githubusercontent.com/dthaler/ebp
f-docs-1/format/draft-ietf-bpf-isa.html

v1->v2: Fix sphinx issue as recommended by David Vernet
Signed-off-by: default avatarDave Thaler <dthaler1968@gmail.com>
Acked-by: default avatarDavid Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20240301222337.15931-1-dthaler1968@gmail.comSigned-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
      4e73e1bc
    • Jakub Kicinski's avatar
      Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next · 4b2765ae
      Jakub Kicinski authored 
      Daniel Borkmann says:

====================
pull-request: bpf-next 2024-02-29

We've added 119 non-merge commits during the last 32 day(s) which contain
a total of 150 files changed, 3589 insertions(+), 995 deletions(-).

The main changes are:

1) Extend the BPF verifier to enable static subprog calls in spin lock
   critical sections, from Kumar Kartikeya Dwivedi.

2) Fix confusing and incorrect inference of PTR_TO_CTX argument type
   in BPF global subprogs, from Andrii Nakryiko.

3) Larger batch of riscv BPF JIT improvements and enabling inlining
   of the bpf_kptr_xchg() for RV64, from Pu Lehui.

4) Allow skeleton users to change the values of the fields in struct_ops
   maps at runtime, from Kui-Feng Lee.

5) Extend the verifier's capabilities of tracking scalars when they
   are spilled to stack, especially when the spill or fill is narrowing,
   from Maxim Mikityanskiy & Eduard Zingerman.

6) Various BPF selftest improvements to fix errors under gcc BPF backend,
   from Jose E. Marchesi.

7) Avoid module loading failure when the module trying to register
   a struct_ops has its BTF section stripped, from Geliang Tang.

8) Annotate all kfuncs in .BTF_ids section which eventually allows
   for automatic kfunc prototype generation from bpftool, from Daniel Xu.

9) Several updates to the instruction-set.rst IETF standardization
   document, from Dave Thaler.

10) Shrink the size of struct bpf_map resp. bpf_array,
    from Alexei Starovoitov.

11) Initial small subset of BPF verifier prepwork for sleepable bpf_timer,
    from Benjamin Tissoires.

12) Fix bpftool to be more portable to musl libc by using POSIX's
    basename(), from Arnaldo Carvalho de Melo.

13) Add libbpf support to gcc in CORE macro definitions,
    from Cupertino Miranda.

14) Remove a duplicate type check in perf_event_bpf_event,
    from Florian Lehner.

15) Fix bpf_spin_{un,}lock BPF helpers to actually annotate them
    with notrace correctly, from Yonghong Song.

16) Replace the deprecated bpf_lpm_trie_key 0-length array with flexible
    array to fix build warnings, from Kees Cook.

17) Fix resolve_btfids cross-compilation to non host-native endianness,
    from Viktor Malik.

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (119 commits)
  selftests/bpf: Test if shadow types work correctly.
  bpftool: Add an example for struct_ops map and shadow type.
  bpftool: Generated shadow variables for struct_ops maps.
  libbpf: Convert st_ops->data to shadow type.
  libbpf: Set btf_value_type_id of struct bpf_map for struct_ops.
  bpf: Replace bpf_lpm_trie_key 0-length array with flexible array
  bpf, arm64: use bpf_prog_pack for memory management
  arm64: patching: implement text_poke API
  bpf, arm64: support exceptions
  arm64: stacktrace: Implement arch_bpf_stack_walk() for the BPF JIT
  bpf: add is_async_callback_calling_insn() helper
  bpf: introduce in_sleepable() helper
  bpf: allow more maps in sleepable bpf programs
  selftests/bpf: Test case for lacking CFI stub functions.
  bpf: Check cfi_stubs before registering a struct_ops type.
  bpf: Clarify batch lookup/lookup_and_delete semantics
  bpf, docs: specify which BPF_ABS and BPF_IND fields were zero
  bpf, docs: Fix typos in instruction-set.rst
  selftests/bpf: update tcp_custom_syncookie to use scalar packet offset
  bpf: Shrink size of struct bpf_map/bpf_array.
  ...
====================

Link: https://lore.kernel.org/r/20240301001625.8800-1-daniel@iogearbox.netSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      4b2765ae
  5. 01 Mar, 2024 33 commits
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