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Nandita Dukkipati 9b717a8d24 tcp: TLP loss detection. 
This is the second of the TLP patch series; it augments the basic TLP
algorithm with a loss detection scheme.

This patch implements a mechanism for loss detection when a Tail
loss probe retransmission plugs a hole thereby masking packet loss
from the sender. The loss detection algorithm relies on counting
TLP dupacks as outlined in Sec. 3 of:
http://tools.ietf.org/html/draft-dukkipati-tcpm-tcp-loss-probe-01

The basic idea is: Sender keeps track of TLP "episode" upon
retransmission of a TLP packet. An episode ends when the sender receives
an ACK above the SND.NXT (tracked by tlp_high_seq) at the time of the
episode. We want to make sure that before the episode ends the sender
receives a "TLP dupack", indicating that the TLP retransmission was
unnecessary, so there was no loss/hole that needed plugging. If the
sender gets no TLP dupack before the end of the episode, then it reduces
ssthresh and the congestion window, because the TLP packet arriving at
the receiver probably plugged a hole.

Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2013-03-12 08:30:34 -04:00
..
netfilter Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
Kconfig net/ipv4: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:40:00 -08:00
Makefile memcg: rename config variables 2012-07-31 18:42:43 -07:00
af_inet.c tunneling: Add generic Tunnel segmentation. 2013-03-09 16:09:17 -05:00
ah4.c net: Add skb_unclone() helper function. 2013-02-15 15:10:37 -05:00
arp.c net: proc: change proc_net_remove to remove_proc_entry 2013-02-18 14:53:08 -05:00
cipso_ipv4.c cipso: don't follow a NULL pointer when setsockopt() is called 2012-07-18 09:01:12 -07:00
datagram.c ipv4: Add a socket release callback for datagram sockets 2013-01-21 14:17:05 -05:00
devinet.c netconf: add the handler to dump entries 2013-03-06 15:40:53 -05:00
esp4.c xfrm4: Invalidate all ipv4 routes on IPsec pmtu events 2013-01-21 12:43:54 +01:00
fib_frontend.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
fib_lookup.h
…
fib_rules.c sections: fix section conflicts in net 2012-10-06 03:04:45 +09:00
fib_semantics.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
fib_trie.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
gre.c v4 GRE: Add TCP segmentation offload for GRE 2013-02-15 15:17:11 -05:00
icmp.c ipv4: fix error handling in icmp_protocol. 2013-02-22 15:10:18 -05:00
igmp.c net: proc: change proc_net_remove to remove_proc_entry 2013-02-18 14:53:08 -05:00
inet_connection_sock.c Fix: sparse warning in inet_csk_prepare_forced_close 2013-03-07 16:31:29 -05:00
inet_diag.c tcp: Tail loss probe (TLP) 2013-03-12 08:30:34 -04:00
inet_fragment.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
inet_hashtables.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
inet_lro.c net: add skb frag size accessors 2011-10-19 03:10:46 -04:00
inet_timewait_sock.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
inetpeer.c Merge branch 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2012-10-02 09:54:49 -07:00
ip_forward.c ipv4: introduce rt_uses_gateway 2012-10-08 17:42:36 -04:00
ip_fragment.c net: Add skb_unclone() helper function. 2013-02-15 15:10:37 -05:00
ip_gre.c tunnel: use iptunnel_xmit() again 2013-03-10 03:05:44 -04:00
ip_input.c ipv[4|6]: correct dropwatch false positive in local_deliver_finish 2013-03-01 15:56:29 -05:00
ip_options.c net/ipv4: Ensure that location of timestamp option is stored 2013-03-12 05:35:39 -04:00
ip_output.c net: Fix possible wrong checksum generation. 2013-02-13 13:30:10 -05:00
ip_sockglue.c net: prevent setting ttl=0 via IP_TTL 2013-01-08 17:57:10 -08:00
ip_vti.c net: Allow userns root to control ipv4 2012-11-18 20:32:45 -05:00
ipcomp.c ipcomp: Mark as netns_ok. 2013-02-04 15:46:15 -05:00
ipconfig.c net: proc: change proc_net_fops_create to proc_create 2013-02-18 14:53:08 -05:00
ipip.c tunnel: use iptunnel_xmit() again 2013-03-10 03:05:44 -04:00
ipmr.c net: proc: change proc_net_remove to remove_proc_entry 2013-02-18 14:53:08 -05:00
netfilter.c netfilter: properly annotate ipv4_netfilter_{init,fini}() 2012-09-03 13:56:04 +02:00
ping.c ipv4: fix a bug in ping_err(). 2013-02-21 15:25:00 -05:00
proc.c tcp: TLP loss detection. 2013-03-12 08:30:34 -04:00
protocol.c ipv4: Disallow non-namespace aware protocols to register. 2013-02-05 14:42:23 -05:00
raw.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
route.c net: ipv4: fix waring -Wunused-variable 2013-02-19 13:18:13 -05:00
syncookies.c tcp: make sysctl_tcp_ecn namespace aware 2013-01-06 21:09:56 -08:00
sysctl_net_ipv4.c tcp: Tail loss probe (TLP) 2013-03-12 08:30:34 -04:00
tcp.c tunneling: Add generic Tunnel segmentation. 2013-03-09 16:09:17 -05:00
tcp_bic.c tcp: fix undo after RTO for BIC 2012-01-20 14:17:26 -05:00
tcp_cong.c tcp: remove Appropriate Byte Count support 2013-02-05 14:51:16 -05:00
tcp_cubic.c tcp: fix undo after RTO for CUBIC 2012-01-20 14:17:26 -05:00
tcp_diag.c inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
tcp_fastopen.c tcp: TCP Fast Open Server - header & support functions 2012-08-31 20:02:18 -04:00
tcp_highspeed.c
…
tcp_htcp.c
…
tcp_hybla.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_illinois.c net: fix divide by zero in tcp algorithm illinois 2012-11-01 11:55:59 -04:00
tcp_input.c tcp: TLP loss detection. 2013-03-12 08:30:34 -04:00
tcp_ipv4.c tcp: Tail loss probe (TLP) 2013-03-12 08:30:34 -04:00
tcp_lp.c
…
tcp_memcontrol.c memcg: decrement static keys at real destroy time 2012-05-29 16:22:28 -07:00
tcp_metrics.c tcp: handle tcp_net_metrics_init() order-5 memory allocation failures 2012-11-16 13:36:27 -05:00
tcp_minisocks.c tcp: TLP loss detection. 2013-03-12 08:30:34 -04:00
tcp_output.c tcp: TLP loss detection. 2013-03-12 08:30:34 -04:00
tcp_probe.c net: proc: change proc_net_remove to remove_proc_entry 2013-02-18 14:53:08 -05:00
tcp_scalable.c
…
tcp_timer.c tcp: TLP loss detection. 2013-03-12 08:30:34 -04:00
tcp_vegas.c
…
tcp_vegas.h
…
tcp_veno.c
…
tcp_westwood.c
…
tcp_yeah.c
…
tunnel4.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
udp.c tunneling: Add generic Tunnel segmentation. 2013-03-09 16:09:17 -05:00
udp_diag.c netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
udp_impl.h ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
udplite.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
xfrm4_input.c net: Add skb_unclone() helper function. 2013-02-15 15:10:37 -05:00
xfrm4_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c ip: fix warning in xfrm4_mode_tunnel_input 2013-02-18 12:42:48 -05:00
xfrm4_output.c
…
xfrm4_policy.c xfrm: make gc_thresh configurable in all namespaces 2013-02-06 11:36:29 +01:00
xfrm4_state.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
xfrm4_tunnel.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00