This patchset is the 2nd in the dynptr series. The 1st can be found here [0].
This patchset adds skb and xdp type dynptrs, which have two main benefits for
packet parsing:
* allowing operations on sizes that are not statically known at
compile-time (eg variable-sized accesses).
* more ergonomic and less brittle iteration through data (eg does not need
manual if checking for being within bounds of data_end)
When comparing the differences in runtime for packet parsing without dynptrs
vs. with dynptrs, there is no noticeable difference (see patch 3 for more
details).
[0] https://lore.kernel.org/bpf/20220523210712.3641569-1-joannelkoong@xxxxxxxxx/
Joanne Koong (3):
bpf: Add skb dynptrs
bpf: Add xdp dynptrs
selftests/bpf: tests for using dynptrs to parse skb and xdp buffers
include/linux/bpf.h | 14 ++-
include/linux/filter.h | 7 ++
include/uapi/linux/bpf.h | 58 ++++++++-
kernel/bpf/helpers.c | 64 +++++++++-
kernel/bpf/verifier.c | 48 +++++++-
net/core/filter.c | 99 +++++++++++++--
tools/include/uapi/linux/bpf.h | 58 ++++++++-
.../testing/selftests/bpf/prog_tests/dynptr.c | 85 ++++++++++---
.../selftests/bpf/prog_tests/dynptr_xdp.c | 49 ++++++++
.../testing/selftests/bpf/progs/dynptr_fail.c | 76 ++++++++++++
.../selftests/bpf/progs/dynptr_success.c | 32 +++++
.../selftests/bpf/progs/test_dynptr_xdp.c | 115 ++++++++++++++++++
.../selftests/bpf/progs/test_l4lb_noinline.c | 71 +++++------
tools/testing/selftests/bpf/progs/test_xdp.c | 95 +++++++--------
.../selftests/bpf/test_tcp_hdr_options.h | 1 +
15 files changed, 741 insertions(+), 131 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/dynptr_xdp.c
create mode 100644 tools/testing/selftests/bpf/progs/test_dynptr_xdp.c
--
2.30.2
