From: Hans Montero <hjm2133@xxxxxxxxxxxx> This patch set adds a BPF local storage optimization. The first patch adds the feature, and the second patch extends the bpf selftests so that the feature is tested. We are running BPF programs for each egress packet and noticed that bpf_sk_storage_get incurs a significant amount of cpu time. By inlining the storage into struct sock and accessing that instead of performing a map lookup, we expect to reduce overhead for our specific use-case. This also has a side-effect of persisting the socket storage, which can be beneficial. This optimization is disabled by default and can be enabled by setting CONFIG_BPF_SHARED_LOCAL_STORAGE_SIZE, the byte length of the inline buffer, to a non-zero number. Hans Montero (2): bpf: Implement shared sk_storage optimization selftests/bpf: Extend tests for shared sk_storage include/net/sock.h | 3 ++ include/uapi/linux/bpf.h | 6 +++ kernel/bpf/Kconfig | 11 +++++ kernel/bpf/bpf_local_storage.c | 3 +- net/core/bpf_sk_storage.c | 47 ++++++++++++++++++- tools/testing/selftests/bpf/config | 1 + .../selftests/bpf/prog_tests/bpf_iter.c | 31 +++++++++++- .../bpf/prog_tests/test_local_storage.c | 3 ++ .../progs/bpf_iter_bpf_sk_storage_helpers.c | 27 ++++++++++- .../selftests/bpf/progs/local_storage.c | 30 ++++++++++++ 10 files changed, 156 insertions(+), 6 deletions(-) -- 2.30.2
