1. 04 Mar, 2024 2 commits
  2. 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
  3. 01 Mar, 2024 36 commits