kernel_optimize_test/net/core
Alexei Starovoitov 27b29f6305 bpf: add bpf_redirect() helper
Existing bpf_clone_redirect() helper clones skb before redirecting
it to RX or TX of destination netdev.
Introduce bpf_redirect() helper that does that without cloning.

Benchmarked with two hosts using 10G ixgbe NICs.
One host is doing line rate pktgen.
Another host is configured as:
$ tc qdisc add dev $dev ingress
$ tc filter add dev $dev root pref 10 u32 match u32 0 0 flowid 1:2 \
   action bpf run object-file tcbpf1_kern.o section clone_redirect_xmit drop
so it receives the packet on $dev and immediately xmits it on $dev + 1
The section 'clone_redirect_xmit' in tcbpf1_kern.o file has the program
that does bpf_clone_redirect() and performance is 2.0 Mpps

$ tc filter add dev $dev root pref 10 u32 match u32 0 0 flowid 1:2 \
   action bpf run object-file tcbpf1_kern.o section redirect_xmit drop
which is using bpf_redirect() - 2.4 Mpps

and using cls_bpf with integrated actions as:
$ tc filter add dev $dev root pref 10 \
  bpf run object-file tcbpf1_kern.o section redirect_xmit integ_act classid 1
performance is 2.5 Mpps

To summarize:
u32+act_bpf using clone_redirect - 2.0 Mpps
u32+act_bpf using redirect - 2.4 Mpps
cls_bpf using redirect - 2.5 Mpps

For comparison linux bridge in this setup is doing 2.1 Mpps
and ixgbe rx + drop in ip_rcv - 7.8 Mpps

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-09-17 21:09:07 -07:00
..
datagram.c net: Fix skb_set_peeked use-after-free bug 2015-08-06 21:55:47 -07:00
dev_addr_lists.c net: fix spelling for synchronized 2014-11-18 15:26:32 -05:00
dev_ioctl.c dev_ioctl: use sizeof(x) instead of sizeof x 2014-11-18 15:27:32 -05:00
dev.c bpf: add bpf_redirect() helper 2015-09-17 21:09:07 -07:00
drop_monitor.c net: Replace get_cpu_var through this_cpu_ptr 2014-08-26 13:45:47 -04:00
dst.c tun_dst: Remove opts_size 2015-08-31 21:23:42 -07:00
ethtool.c net/ethtool: Add current supported tunable options 2015-06-11 00:36:37 -07:00
fib_rules.c net: ipv6: use common fib_default_rule_pref 2015-09-09 14:19:50 -07:00
filter.c bpf: add bpf_redirect() helper 2015-09-17 21:09:07 -07:00
flow_dissector.c flow_dissector: Use 'const' where possible. 2015-09-01 21:19:17 -07:00
flow.c flow: Move __get_hash_from_flowi{4,6} into flow_dissector.c 2015-09-01 17:00:24 -07:00
gen_estimator.c net_sched: gen_estimator: extend pps limit 2015-07-08 13:59:20 -07:00
gen_stats.c gen_stats.c: Duplicate xstats buffer for later use 2015-02-19 15:45:53 -05:00
link_watch.c dev: introduce dev_get_iflink() 2015-04-02 14:04:59 -04:00
lwtunnel.c lwt: Add cfg argument to build_state 2015-08-24 10:34:40 -07:00
Makefile lwtunnel: infrastructure for handling light weight tunnels like mpls 2015-07-21 10:39:03 -07:00
neighbour.c net: add explicit logging and stat for neighbour table overflow 2015-08-10 13:46:21 -07:00
net_namespace.c netns: make nsid_lock per net 2015-05-17 23:41:11 -04:00
net-procfs.c
net-sysfs.c net-sysfs: get_netdev_queue_index() cleanup 2015-09-17 16:35:15 -07:00
net-sysfs.h
net-traces.c net: FIB tracepoints 2015-08-29 13:05:16 -07:00
netclassid_cgroup.c cgroup: net_cls: fix false-positive "suspicious RCU usage" 2015-07-25 00:13:18 -07:00
netevent.c netevent: remove automatic variable in register_netevent_notifier() 2015-05-31 00:03:21 -07:00
netpoll.c netpoll: warn on netpoll_send_udp users who haven't disabled irqs 2015-08-28 16:24:54 -07:00
netprio_cgroup.c
pktgen.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-08-13 16:23:11 -07:00
ptp_classifier.c net: filter: split 'struct sk_filter' into socket and bpf parts 2014-08-02 15:03:58 -07:00
request_sock.c inet: fix races with reqsk timers 2015-08-10 21:17:29 -07:00
rtnetlink.c rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats 2015-09-15 15:25:02 -07:00
scm.c net: introduce helper macro for_each_cmsghdr 2014-12-10 22:41:55 -05:00
secure_seq.c net: remove a sparse error in secure_dccpv6_sequence_number() 2015-05-25 22:55:37 -04:00
skbuff.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-08-27 21:45:31 -07:00
sock_diag.c sock, diag: fix panic in sock_diag_put_filterinfo 2015-09-02 11:29:29 -07:00
sock.c sock: fix kernel doc error 2015-08-27 17:12:41 -07:00
stream.c tcp: set SOCK_NOSPACE under memory pressure 2015-05-09 17:38:36 -04:00
sysctl_net_core.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-03-20 18:51:09 -04:00
timestamping.c net: skb_defer_rx_timestamp should check for phydev before setting up classify 2015-07-09 14:17:15 -07:00
tso.c net: tso: fix unaligned access to crafted TCP header in helper API 2014-10-22 12:52:55 -04:00
utils.c net: Add inet_proto_csum_replace_by_diff utility function 2015-08-17 21:33:06 -07:00