|author||Alexei Starovoitov <email@example.com>||2019-03-02 10:48:27 -0800|
|committer||Alexei Starovoitov <firstname.lastname@example.org>||2019-03-02 10:48:28 -0800|
|parent||samples/bpf: silence compiler warning for xdpsock_user.c (diff)|
|parent||bpf: HBM test script (diff)|
Merge branch 'bpf_skb_ecn_set_ce'
Lawrence Brakmo says: ==================== Host Bandwidth Manager is a framework for limiting the bandwidth used by v2 cgroups. It consists of 1 BPF helper, a sample BPF program to limit egress bandwdith as well as a sample user program and script to simplify HBM testing. The sample HBM 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. A future patch will add support for reducing TCP's cwnd (we are evaluating alternatives). Another patch will add support for fair queueing's Earliest Departure Time. Until then, HBM is better suited for flows supporitng ECN. In addition, A BPF program to limit ingress bandwidth 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 Changes from v2 to v3: * Changed name from NRM (Network Resource Manager) to HBM (Host Bandwdith Manager) * The bpf helper to set ECN ce now checks that the header is writeable * Removed helper bpf functions that modified TCP state due to a concern about whether the socket is locked by the current thread. ==================== Signed-off-by: Alexei Starovoitov <email@example.com>
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