Network Resource Manager is a framework for limiting the bandwidth used
by v2 cgroups. It consists of 4 BPF helpers and a sample BPF program to
limit egress bandwdith as well as a sample user program and script to
simplify NRM testing.
The sample NRM BPF program is not meant to be production quality, it is
provided as proof of concept. A lot more information, including sample
runs in some cases, are provided in the commit messages of the individual
patches.
Two more BPF programs, one to limit ingress and one that limits egress
and uses fq's Earliest Departure Time feature (EDT), will be provided in an
upcomming patchset.
Changes from v1 to v2:
* bpf_tcp_enter_cwr can only be called from a cgroup skb egress BPF
program (otherwise load or attach will fail) where we already hold
the sk lock. Also only applies for ESTABLISHED state.
* bpf_skb_ecn_set_ce uses INET_ECN_set_ce()
* bpf_tcp_check_probe_timer now uses tcp_reset_xmit_timer. Can only be
used by egress cgroup skb programs.
* removed load_cg_skb user program.
* nrm bpf egress program checks packet header in skb to determine
ECN value. Now also works for ECN enabled UDP packets.
Using ECN_ defines instead of integers.
* NRM script test program now uses bpftool instead of load_cg_skb
Martin KaFai Lau (2):
bpf: Remove const from get_func_proto
bpf: Add bpf helper bpf_tcp_enter_cwr
brakmo (7):
bpf: Test bpf_tcp_enter_cwr in test_verifier
bpf: add bpf helper bpf_skb_ecn_set_ce
bpf: Add bpf helper bpf_tcp_check_probe_timer
bpf: sync bpf.h to tools and update bpf_helpers.h
bpf: Sample NRM BPF program to limit egress bw
bpf: User program for testing NRM
bpf: NRM test script
drivers/media/rc/bpf-lirc.c | 2 +-
include/linux/bpf.h | 3 +-
include/linux/filter.h | 3 +-
include/uapi/linux/bpf.h | 27 +-
kernel/bpf/cgroup.c | 2 +-
kernel/bpf/syscall.c | 12 +
kernel/bpf/verifier.c | 4 +
kernel/trace/bpf_trace.c | 10 +-
net/core/filter.c | 101 ++++-
samples/bpf/Makefile | 5 +
samples/bpf/do_nrm_test.sh | 437 +++++++++++++++++++
samples/bpf/nrm.c | 440 ++++++++++++++++++++
samples/bpf/nrm.h | 31 ++
samples/bpf/nrm_kern.h | 137 ++++++
samples/bpf/nrm_out_kern.c | 190 +++++++++
tools/include/uapi/linux/bpf.h | 27 +-
tools/testing/selftests/bpf/bpf_helpers.h | 6 +
tools/testing/selftests/bpf/verifier/sock.c | 33 ++
18 files changed, 1444 insertions(+), 26 deletions(-)
create mode 100755 samples/bpf/do_nrm_test.sh
create mode 100644 samples/bpf/nrm.c
create mode 100644 samples/bpf/nrm.h
create mode 100644 samples/bpf/nrm_kern.h
create mode 100644 samples/bpf/nrm_out_kern.c
--
2.17.1
