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Eric Dumazet 3b24d854cb tcp/dccp: do not touch listener sk_refcnt under synflood 
When a SYNFLOOD targets a non SO_REUSEPORT listener, multiple
cpus contend on sk->sk_refcnt and sk->sk_wmem_alloc changes.

By letting listeners use SOCK_RCU_FREE infrastructure,
we can relax TCP_LISTEN lookup rules and avoid touching sk_refcnt

Note that we still use SLAB_DESTROY_BY_RCU rules for other sockets,
only listeners are impacted by this change.

Peak performance under SYNFLOOD is increased by ~33% :

On my test machine, I could process 3.2 Mpps instead of 2.4 Mpps

Most consuming functions are now skb_set_owner_w() and sock_wfree()
contending on sk->sk_wmem_alloc when cooking SYNACK and freeing them.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-04 22:11:20 -04:00
..
9p
…
bluetooth
Bluetooth: Add support for limited privacy mode
2016-03-10 19:51:30 +01:00
caif
…
irda
…
iucv
s390/iucv: do not use arrays as argument
2015-09-21 16:03:04 -07:00
netfilter
netfilter: nft_masq: support port range
2016-03-02 20:05:27 +01:00
netns
ipv6: per netns FIB garbage collection
2016-03-08 15:16:51 -05:00
nfc
nfc: netlink: HCI event connectivity implementation
2015-12-29 19:06:20 +01:00
phonet
sock: struct proto hash function may error
2016-02-11 03:54:14 -05:00
sctp
sctp: keep fragmentation point aligned to word size
2016-03-20 16:31:12 -04:00
tc_act
net/act_skbedit: Utility functions for mark action
2016-03-10 16:24:02 -05:00
6lowpan.h
6lowpan: iphc: add support for stateful compression
2016-02-23 20:29:40 +01:00
act_api.h
net/sched: Macro instead of CONFIG_NET_CLS_ACT ifdef
2016-03-10 16:24:02 -05:00
addrconf.h
inet: refactor inet[6]_lookup functions to take skb
2016-02-11 03:54:14 -05:00
af_ieee802154.h
ieee802154: af_ieee802154: fix typo in comment.
2015-09-17 13:20:05 +02:00
af_rxrpc.h
…
af_unix.h
unix: correctly track in-flight fds in sending process user_struct
2016-02-08 10:30:42 -05:00
af_vsock.h
Revert "Merge branch 'vsock-virtio'"
2015-12-08 21:55:49 -05:00
ah.h
…
arp.h
…
atmclip.h
…
ax25.h
…
ax88796.h
…
bond_3ad.h
bonding: 3ad: apply ad_actor settings changes immediately
2016-02-09 04:45:49 -05:00
bond_alb.h
…
bond_options.h
…
bonding.h
bonding: fix bond_get_stats()
2016-03-18 23:14:15 -04:00
busy_poll.h
net: un-inline sk_busy_loop()
2015-11-18 16:17:38 -05:00
cfg80211-wext.h
…
cfg80211.h
cfg80211: basic support for PBSS network type
2016-02-24 09:04:34 +01:00
cfg802154.h
nl802154: add support for security layer
2015-09-30 13:16:44 +02:00
checksum.h
csum: Update csum_block_add to use rotate instead of byteswap
2016-03-13 15:01:00 -04:00
cipso_ipv4.h
…
cls_cgroup.h
net: wrap sock->sk_cgrp_prioidx and ->sk_classid inside a struct
2015-12-08 22:02:33 -05:00
codel.h
net_sched: update hierarchical backlog too
2016-02-29 17:02:33 -05:00
compat.h
…
datalink.h
…
dcbevent.h
…
dcbnl.h
…
devlink.h
Introduce devlink infrastructure
2016-03-01 16:07:29 -05:00
dn_dev.h
…
dn_fib.h
…
dn_neigh.h
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
dn_nsp.h
…
dn_route.h
…
dn.h
…
dsa.h
net: dsa: make port_bridge_leave return void
2016-03-14 16:05:31 -04:00
dsfield.h
…
dst_cache.h
net: add dst_cache support
2016-02-16 20:21:48 -05:00
dst_metadata.h
ip_tunnel: add support for setting flow label via collect metadata
2016-03-11 15:14:26 -05:00
dst_ops.h
ipv4, ipv6: Pass net into __ip_local_out and __ip6_local_out
2015-10-08 04:27:02 -07:00
dst.h
bpf, dst: add and use dst_tclassid helper
2016-03-18 19:38:46 -04:00
esp.h
…
ethoc.h
net/ethoc: support big-endian register layout
2015-09-23 15:33:15 -07:00
fib_rules.h
net: ipv6: use common fib_default_rule_pref
2015-09-09 14:19:50 -07:00
firewire.h
…
flow_dissector.h
net/flow_dissector: Make dissector_uses_key() and skb_flow_dissector_target() public
2016-03-10 16:24:02 -05:00
flow.h
ipv6, trace: fix tos reporting on fib6_table_lookup
2016-03-20 13:44:34 -04:00
flowcache.h
…
fou.h
…
garp.h
…
gen_stats.h
…
genetlink.h
Revert "genl: Add genlmsg_new_unicast() for unicast message allocation"
2016-02-18 11:42:19 -05:00
geneve.h
geneve: Add geneve_get_rx_port support
2015-12-16 10:58:56 -05:00
gre.h
…
gro_cells.h
gro_cells: remove spinlock protecting receive queues
2015-08-31 15:17:17 -07:00
gue.h
…
hwbm.h
net: add a hardware buffer management helper API
2016-03-14 12:19:46 -04:00
icmp.h
…
ieee80211_radiotap.h
…
ieee802154_netdev.h
mac802154: constify ieee802154_llsec_ops structure
2016-01-04 20:40:41 +01:00
if_inet6.h
…
ila.h
ila: Add generic ILA translation facility
2015-12-15 23:25:20 -05:00
inet6_connection_sock.h
ipv6: remove unused in6_addr struct
2016-03-22 15:45:44 -04:00
inet6_hashtables.h
tcp/dccp: do not touch listener sk_refcnt under synflood
2016-04-04 22:11:20 -04:00
inet_common.h
net: avoid NULL deref in inet_ctl_sock_destroy()
2015-11-02 22:46:09 -05:00
inet_connection_sock.h
tcp/dccp: fix another race at listener dismantle
2016-02-18 11:35:51 -05:00
inet_ecn.h
ipv6: update skb->csum when CE mark is propagated
2016-01-15 15:07:23 -05:00
inet_frag.h
ipv4: namespacify ip fragment max dist sysctl knob
2016-02-16 20:42:54 -05:00
inet_hashtables.h
tcp/dccp: do not touch listener sk_refcnt under synflood
2016-04-04 22:11:20 -04:00
inet_sock.h
net: Allow accepted sockets to be bound to l3mdev domain
2015-12-18 14:43:38 -05:00
inet_timewait_sock.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-10-20 06:08:27 -07:00
inetpeer.h
inet: tcp: fix inetpeer_set_addr_v4()
2015-12-16 00:14:12 -05:00
ip6_checksum.h
ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short
2016-03-13 23:55:13 -04:00
ip6_fib.h
ipv6: Check rt->dst.from for the DST_NOCACHE route
2015-11-15 17:12:37 -05:00
ip6_route.h
ipv6: enforce flowi6_oif usage in ip6_dst_lookup_tail()
2016-01-29 20:31:26 -08:00
ip6_tunnel.h
net: replace dst_cache ip6_tunnel implementation with the generic one
2016-02-16 20:21:48 -05:00
ip_fib.h
route: check and remove route cache when we get route
2016-02-18 11:31:36 -05:00
ip_tunnels.h
tunnels: Remove encapsulation offloads on decap.
2016-03-20 16:33:40 -04:00
ip_vs.h
ipvs: drop first packet to redirect conntrack
2016-03-07 11:53:30 +09:00
ip.h
ipv4: process socket-level control messages in IPv4
2016-04-04 15:50:30 -04:00
ipcomp.h
…
ipconfig.h
…
ipv6.h
sock: enable timestamping using control messages
2016-04-04 15:50:30 -04:00
ipx.h
…
iw_handler.h
cfg80211/wext: fix message ordering
2016-01-29 17:13:43 +01:00
kcm.h
kcm: mark helper functions inline
2016-03-10 14:42:03 -05:00
l3mdev.h
net: l3mdev: address selection should only consider devices in L3 domain
2016-02-26 14:22:26 -05:00
lapb.h
…
lib80211.h
…
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
…
llc_if.h
…
llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
llc.h
…
lwtunnel.h
lwtunnel: autoload of lwt modules
2016-02-21 22:00:28 -05:00
mac80211.h
mac80211: move MU_MIMO_OWNER flag to ieee80211_vif
2016-02-24 09:04:40 +01:00
mac802154.h
mac802154: use put and get unaligned functions
2016-03-10 19:51:28 +01:00
mip6.h
…
mld.h
…
mpls_iptunnel.h
mpls: multipath route support
2015-10-23 06:26:42 -07:00
mpls.h
…
mrp.h
…
ndisc.h
Revert "ipv6: ndisc: inherit metadata dst when creating ndisc requests"
2015-12-01 15:07:59 -05:00
neighbour.h
…
net_namespace.h
netfilter: cttimeout: add netns support
2015-12-14 12:48:58 +01:00
net_ratelimit.h
…
netevent.h
…
netlabel.h
…
netlink.h
netlink: add nla_get for le32 and le64
2015-09-30 13:16:44 +02:00
netprio_cgroup.h
net: wrap sock->sk_cgrp_prioidx and ->sk_classid inside a struct
2015-12-08 22:02:33 -05:00
netrom.h
…
nexthop.h
…
nl802154.h
nl802154: add support for security layer
2015-09-30 13:16:44 +02:00
p8022.h
…
ping.h
net: ping: make ping_v6_sendmsg static
2016-03-23 22:09:58 -04:00
pkt_cls.h
net/flower: Fix pointer cast
2016-03-11 12:04:37 -05:00
pkt_sched.h
net: sched: consolidate tc_classify{,_compat}
2015-08-27 14:18:48 -07:00
protocol.h
udp: restrict offloads to one namespace
2016-01-10 17:28:24 -05:00
psnap.h
…
raw.h
sock: struct proto hash function may error
2016-02-11 03:54:14 -05:00
rawv6.h
…
red.h
…
regulatory.h
…
request_sock.h
inet: reqsk_alloc() needs to take care of dead listeners
2016-04-04 22:11:19 -04:00
rose.h
…
route.h
ipv4: Namespaceify ip_default_ttl sysctl knob
2016-02-16 20:42:54 -05:00
rtnetlink.h
netlink: Rightsize IFLA_AF_SPEC size calculation
2015-10-21 19:15:20 -07:00
sch_generic.h
net: sched: use pfifo_fast for non real queues
2016-03-03 17:38:46 -05:00
scm.h
unix: correctly track in-flight fds in sending process user_struct
2016-02-08 10:30:42 -05:00
secure_seq.h
…
slhc_vj.h
…
snmp.h
…
sock_reuseport.h
soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind
2016-01-19 14:44:23 -05:00
sock.h
udp: no longer use SLAB_DESTROY_BY_RCU
2016-04-04 22:11:19 -04:00
Space.h
…
stp.h
…
switchdev.h
switchdev: Adding MDB entry offload
2016-01-10 16:50:20 -05:00
tcp_states.h
…
tcp.h
tcp: use one bit in TCP_SKB_CB to mark ACK timestamps
2016-04-04 15:50:29 -04:00
timewait_sock.h
…
transp_v6.h
ipv6: process socket-level control messages in IPv6
2016-04-04 15:50:30 -04:00
tso.h
net: tso: add support for IPv6
2015-10-26 22:24:22 -07:00
udp_tunnel.h
ip_tunnel: add support for setting flow label via collect metadata
2016-03-11 15:14:26 -05:00
udp.h
udp: no longer use SLAB_DESTROY_BY_RCU
2016-04-04 22:11:19 -04:00
udplite.h
…
vsock_addr.h
…
vxlan.h
vxlan: fix sparse warnings
2016-03-21 13:30:02 -04:00
wext.h
…
wimax.h
…
x25.h
…
x25device.h
…
xfrm.h
xfrm: add rcu protection to sk->sk_policy[]
2015-12-11 19:22:06 -05:00