Eric Dumazet e6c022a4fa tcp: better retrans tracking for defer-accept ... For passive TCP connections using TCP_DEFER_ACCEPT facility, we incorrectly increment req->retrans each time timeout triggers while no SYNACK is sent. SYNACK are not sent for TCP_DEFER_ACCEPT that were established (for which we received the ACK from client). Only the last SYNACK is sent so that we can receive again an ACK from client, to move the req into accept queue. We plan to change this later to avoid the useless retransmit (and potential problem as this SYNACK could be lost) TCP_INFO later gives wrong information to user, claiming imaginary retransmits. Decouple req->retrans field into two independent fields : num_retrans : number of retransmit num_timeout : number of timeouts num_timeout is the counter that is incremented at each timeout, regardless of actual SYNACK being sent or not, and used to compute the exponential timeout. Introduce inet_rtx_syn_ack() helper to increment num_retrans only if ->rtx_syn_ack() succeeded. Use inet_rtx_syn_ack() from tcp_check_req() to increment num_retrans when we re-send a SYNACK in answer to a (retransmitted) SYN. Prior to this patch, we were not counting these retransmits. Change tcp_v[46]_rtx_synack() to increment TCP_MIB_RETRANSSEGS only if a synack packet was successfully queued. Reported-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Julian Anastasov <ja@ssi.bg> Cc: Vijay Subramanian <subramanian.vijay@gmail.com> Cc: Elliott Hughes <enh@google.com> Cc: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2012-11-03 14:45:00 -04:00
..
9p	9p: Reduce object size with CONFIG_NET_9P_DEBUG	2012-01-05 10:51:44 -06:00
bluetooth	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next	2012-09-24 14:39:16 -04:00
caif	caif-hsi: Remove use of module parameters	2012-06-25 16:44:12 -07:00
irda	TTY: ircomm, use tty from tty_port	2012-06-12 15:50:24 -07:00
iucv	af_iucv: add shutdown for HS transport	2012-03-07 22:52:24 -08:00
netfilter	netlink: Rename pid to portid to avoid confusion	2012-09-10 15:30:41 -04:00
netns	sctp: Make hmac algorithm selection for cookie generation dynamic	2012-10-26 02:22:18 -04:00
nfc	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem	2012-09-28 11:11:16 -04:00
phonet	net: remove my future former mail address	2012-06-17 16:29:38 -07:00
sctp	sctp: Make hmac algorithm selection for cookie generation dynamic	2012-10-26 02:22:18 -04:00
tc_act
act_api.h
addrconf.h	netfilter: ip6tables: add MASQUERADE target	2012-08-30 03:00:18 +02:00
af_ieee802154.h
af_rxrpc.h
af_unix.h	unix: Remove unused field from unix_sock	2012-10-21 20:37:06 -04:00
ah.h
arp.h	net: Dont use ifindices in hash fns	2012-08-09 16:18:06 -07:00
atmclip.h	atm: clip: Use device neigh support on top of "arp_tbl".	2011-11-30 18:51:03 -05:00
ax25.h	userns: Convert net/ax25 to use kuid_t where appropriate	2012-08-14 21:49:42 -07:00
ax88796.h
cfg80211-wext.h
cfg80211.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem	2012-09-28 11:11:16 -04:00
checksum.h	net: core: add function for incremental IPv6 pseudo header checksum updates	2012-08-30 03:00:16 +02:00
cipso_ipv4.h	cipso: handle CIPSO options correctly when NetLabel is disabled	2012-06-01 14:18:29 -04:00
cls_cgroup.h	net: Update args to dummy sock_update_classid().	2012-10-26 05:07:00 -04:00
codel.h	codel: refine one condition to avoid a nul rec_inv_sqrt	2012-08-10 16:52:54 -07:00
compat.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
datalink.h
dcbevent.h
dcbnl.h	net/dcb: Add an optional max rate attribute	2012-04-05 05:08:04 -04:00
dn.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dn_dev.h
dn_fib.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dn_neigh.h
dn_nsp.h
dn_route.h	decnet: Use neighbours privately in dn_route struct.	2012-07-05 01:12:14 -07:00
dsa.h	dsa: Include linux/if_ether.h to fix build error	2011-12-01 11:41:06 -05:00
dsfield.h
dst.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-08-22 14:21:38 -07:00
dst_ops.h	net: Fix warnings in dst_ops.h	2012-07-19 10:43:03 -07:00
esp.h
ethoc.h
fib_rules.h	ipv4: Elide fib_validate_source() completely when possible.	2012-06-29 01:36:36 -07:00
flow.h	ipv4: Add FLOWI_FLAG_KNOWN_NH	2012-10-08 17:42:36 -04:00
flow_keys.h	flow_dissector: use a 64bit load/store	2011-11-29 13:17:03 -05:00
garp.h
gen_stats.h
genetlink.h	netlink: Rename pid to portid to avoid confusion	2012-09-10 15:30:41 -04:00
gre.h
gro_cells.h	net: add gro_cells infrastructure	2012-10-01 17:01:46 -04:00
icmp.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
ieee80211_radiotap.h	wireless: add radiotap A-MPDU status field	2012-08-20 13:53:09 +02:00
ieee802154.h	6LoWPAN: add fragmentation support	2011-11-14 00:19:42 -05:00
ieee802154_netdev.h	mac802154: declare reduced mlme operations	2012-05-16 15:16:56 -04:00
if_inet6.h	net: delete all instances of special processing for token ring	2012-05-15 20:14:35 -04:00
inet6_connection_sock.h	ipv6: Add helper inet6_csk_update_pmtu().	2012-07-16 03:44:56 -07:00
inet6_hashtables.h	ipv6: Early TCP socket demux	2012-07-26 15:50:39 -07:00
inet_common.h	net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN)	2012-07-19 11:02:03 -07:00
inet_connection_sock.h	net: ipv6: fix TCP early demux	2012-08-06 13:33:21 -07:00
inet_ecn.h	tunnel: drop packet if ECN present with not-ECT	2012-09-27 18:12:37 -04:00
inet_frag.h	ipv6: unify fragment thresh handling code	2012-09-19 17:23:28 -04:00
inet_hashtables.h	ipv4: Early TCP socket demux.	2012-06-19 21:22:05 -07:00
inet_sock.h	net: use a per task frag allocator	2012-09-24 16:31:37 -04:00
inet_timewait_sock.h	inet: remove rcu protection on tw_net	2011-12-14 13:34:55 -05:00
inetpeer.h	ipv4: Maintain redirect and PMTU info in struct rtable again.	2012-07-10 22:40:14 -07:00
ip.h	ipv4: fix path MTU discovery with connection tracking	2012-08-26 19:13:55 +02:00
ip6_checksum.h
ip6_fib.h	ipv6: add support of equal cost multipath (ECMP)	2012-10-23 02:38:32 -04:00
ip6_route.h	ipv6: fix inet6_csk_xmit()	2012-07-18 08:59:58 -07:00
ip6_tunnel.h	gre: Support GRE over IPv6	2012-08-14 14:28:32 -07:00
ip_fib.h	ipv4: add a fib_type to fib_info	2012-10-04 13:58:26 -04:00
ip_vs.h	ipvs: fix build errors related to config option combinations	2012-10-23 09:23:40 +09:00
ipcomp.h
ipconfig.h
ipip.h	ipv4: gre: add GRO capability	2012-10-01 17:01:57 -04:00
ipv6.h	ipv6: make ip6_frag_nqueues() and ip6_frag_mem() static inline	2012-09-19 17:23:28 -04:00
ipx.h
iw_handler.h
lapb.h	lapb: Neaten debugging	2012-05-17 18:45:20 -04:00
lib80211.h	include: replace linux/module.h with "struct module" wherever possible	2011-10-31 19:32:32 -04:00
llc.h	llc: Remove stray reference to sysctl_llc_station_ack_timeout.	2012-09-17 13:13:24 -04:00
llc_c_ac.h
llc_c_ev.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h	net: delete all instances of special processing for token ring	2012-05-15 20:14:35 -04:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
mac80211.h	mac80211: add key flag for management keys	2012-09-10 11:29:17 +02:00
mac802154.h	mac802154: add wpan device-class support	2012-06-26 21:06:11 -07:00
mip6.h
mld.h
ndisc.h	net: Dont use ifindices in hash fns	2012-08-09 16:18:06 -07:00
neighbour.h	net: output path optimizations	2012-08-07 16:24:55 -07:00
net_namespace.h	sections: fix section conflicts in net	2012-10-06 03:04:45 +09:00
net_ratelimit.h
netdma.h
netevent.h	net: Pass neighbours and dest address into NETEVENT_REDIRECT events.	2012-07-05 02:21:55 -07:00
netlabel.h	userns: Convert the audit loginuid to be a kuid	2012-09-17 18:08:54 -07:00
netlink.h	netlink: Rename pid to portid to avoid confusion	2012-09-10 15:30:41 -04:00
netprio_cgroup.h	cgroup: Assign subsystem IDs during compile time	2012-09-14 09:57:43 -07:00
netrom.h
nexthop.h
nl802154.h
p8022.h
ping.h
pkt_cls.h
pkt_sched.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
protocol.h	ipv6: Early TCP socket demux	2012-07-26 15:50:39 -07:00
psnap.h
raw.h
rawv6.h	ipv6: bool/const conversions phase2	2012-05-19 01:08:16 -04:00
red.h	net_sched: red: Make minor corrections to comments	2012-04-16 23:53:11 -04:00
regulatory.h	cfg80211: add cellular base station regulatory hint support	2012-07-17 12:16:39 +02:00
request_sock.h	tcp: better retrans tracking for defer-accept	2012-11-03 14:45:00 -04:00
rose.h
route.h	ipv4: introduce rt_uses_gateway	2012-10-08 17:42:36 -04:00
rtnetlink.h	rtnl: allow to specify different num for rx and tx queue count	2012-07-20 11:06:59 -07:00
sch_generic.h	net sched: Pass the skb into change so it can access NETLINK_CB	2012-08-14 21:55:28 -07:00
scm.h	net: Remove unnecessary NULL check in scm_destroy().	2012-09-24 15:52:33 -04:00
secure_seq.h	tcp: add const qualifiers where possible	2011-10-21 05:22:42 -04:00
slhc_vj.h
snmp.h	net: avoid reloads in SNMP_UPD_PO_STATS	2012-08-06 13:40:47 -07:00
sock.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-10-02 13:38:27 -07:00
stp.h
tcp.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-10-02 11:11:09 -07:00
tcp_memcontrol.h	cgroup: pass struct mem_cgroup instead of struct cgroup to socket memcg	2012-04-10 10:04:07 -07:00
tcp_states.h
timewait_sock.h	[PATCH] tcp: Cache inetpeer in timewait socket, and only when necessary.	2012-06-09 14:56:12 -07:00
transp_v6.h
udp.h	net/ipv6/udp: UDP encapsulation: introduce encap_rcv hook into IPv6	2012-04-28 22:21:51 -04:00
udplite.h	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
wext.h
wimax.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
wpan-phy.h	mac802154: monitor device support	2012-05-16 15:17:08 -04:00
x25.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
x25device.h
xfrm.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-10-02 13:38:27 -07:00