[PATCH bpf-next v2 0/2] bpf: Add kfuncs for read-only string operations

[Viktor Malik <vmalik@redhat.com>]

Kernel contains highly optimised implementation of traditional string
operations. Expose them as kfuncs to allow BPF programs leverage the
kernel implementation instead of needing to reimplement the operations.

These will be very helpful to bpftrace as it now needs to implement all
the string operations in LLVM IR.

v1 -> v2:
- use bpf_probe_read_kernel_str instead of bpf_probe_read_str in
  selftests as the latter cannot be used on some arches (s390x)

Viktor Malik (2):
  bpf: Add kfuncs for read-only string operations
  selftests/bpf: Add tests for string kfuncs

 kernel/bpf/helpers.c                          |  66 ++++++
 .../selftests/bpf/prog_tests/string_kfuncs.c  |  37 +++
 .../selftests/bpf/progs/test_string_kfuncs.c  | 215 ++++++++++++++++++
 3 files changed, 318 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/string_kfuncs.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_string_kfuncs.c

-- 
2.46.0