while net-next is closed, collecting feedback... V2: No changes to BPF engine No changes to uapi Add static branch prediction markings, remove unnecessary safety checks, fix crash where packets were enqueued to a BPF program while program was being unloaded
V1: Today OVS is a cache engine. Userspace controller simulates traversal of network topology and establishes a flow (cached result of the traversal). Suffering upcall penalty, flow explosion, flow invalidation on topology changes, difficulties in keeping inner topology stats, etc. This patch enhances OVS by moving simple cases of topology traversal next to the packet. On a flow miss the chain of BPF programs executes the network topology. If packet requires userspace processing it can be pushed up by BPF program. BPF program that represent a bridge just needs to forward packets. MAC learning can be done either by BPF program or via userpsace upcall. Such bridge/router/nat can be programmed in BPF. To achieve that BPF was extended to allow easier programability in restricted C or in dataplane language. Patch 1/2: generic BPF extension Original A and X 32-bit BPF registers are replaced with ten 64-bit registers. bpf opcode encoding kept the same. load/store were generalized to access stack, bpf_tables and bpf_context. BPF program interfaces to outside world via tables that it can read and write, and via bpf_context which is in/out blob of data. Other kernel components can provide callbacks to tailor BPF to specific needs. Patch 2/2: extends OVS with network functions that use BPF as execution engine BPF backend for GCC is available at: https://github.com/iovisor/bpf_gcc Distributed bridge demo written in BPF: https://github.com/iovisor/iovisor Alexei Starovoitov (2): extended BPF extend OVS to use BPF programs on flow miss arch/x86/net/Makefile | 2 +- arch/x86/net/bpf2_jit_comp.c | 610 +++++++++++++++++++ arch/x86/net/bpf_jit_comp.c | 41 +- arch/x86/net/bpf_jit_comp.h | 36 ++ include/linux/filter.h | 79 +++ include/uapi/linux/filter.h | 125 +++- include/uapi/linux/openvswitch.h | 140 +++++ net/core/Makefile | 2 +- net/core/bpf_check.c | 1043 ++++++++++++++++++++++++++++++++ net/core/bpf_run.c | 412 +++++++++++++ net/openvswitch/Makefile | 7 +- net/openvswitch/bpf_callbacks.c | 295 +++++++++ net/openvswitch/bpf_plum.c | 931 +++++++++++++++++++++++++++++ net/openvswitch/bpf_replicator.c | 155 +++++ net/openvswitch/bpf_table.c | 500 ++++++++++++++++ net/openvswitch/datapath.c | 102 +++- net/openvswitch/datapath.h | 5 + net/openvswitch/dp_bpf.c | 1228 ++++++++++++++++++++++++++++++++++++++ net/openvswitch/dp_bpf.h | 160 +++++ net/openvswitch/dp_notify.c | 7 + net/openvswitch/vport-gre.c | 10 - net/openvswitch/vport-netdev.c | 15 +- net/openvswitch/vport-netdev.h | 1 + net/openvswitch/vport.h | 10 + 24 files changed, 5854 insertions(+), 62 deletions(-) create mode 100644 arch/x86/net/bpf2_jit_comp.c create mode 100644 arch/x86/net/bpf_jit_comp.h create mode 100644 net/core/bpf_check.c create mode 100644 net/core/bpf_run.c create mode 100644 net/openvswitch/bpf_callbacks.c create mode 100644 net/openvswitch/bpf_plum.c create mode 100644 net/openvswitch/bpf_replicator.c create mode 100644 net/openvswitch/bpf_table.c create mode 100644 net/openvswitch/dp_bpf.c create mode 100644 net/openvswitch/dp_bpf.h -- 1.7.9.5 _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
