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e73ebb0881
linux/net/ipv4
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Neal Cardwell e73ebb0881 tcp: stretch ACK fixes prep 
LRO, GRO, delayed ACKs, and middleboxes can cause "stretch ACKs" that
cover more than the RFC-specified maximum of 2 packets. These stretch
ACKs can cause serious performance shortfalls in common congestion
control algorithms that were designed and tuned years ago with
receiver hosts that were not using LRO or GRO, and were instead
politely ACKing every other packet.

This patch series fixes Reno and CUBIC to handle stretch ACKs.

This patch prepares for the upcoming stretch ACK bug fix patches. It
adds an "acked" parameter to tcp_cong_avoid_ai() to allow for future
fixes to tcp_cong_avoid_ai() to correctly handle stretch ACKs, and
changes all congestion control algorithms to pass in 1 for the ACKed
count. It also changes tcp_slow_start() to return the number of packet
ACK "credits" that were not processed in slow start mode, and can be
processed by the congestion control module in additive increase mode.

In future patches we will fix tcp_cong_avoid_ai() to handle stretch
ACKs, and fix Reno and CUBIC handling of stretch ACKs in slow start
and additive increase mode.

Reported-by: Eyal Perry <eyalpe@mellanox.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-28 22:18:37 -08:00
..
netfilter netfilter: nf_tables: fix port natting in little endian archs 2014-12-23 15:34:28 +01:00
af_inet.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-29 20:47:48 -08:00
ah4.c ipsec: Remove obsolete MAX_AH_AUTH_LEN 2014-09-18 10:54:36 +02:00
arp.c neigh: remove dynamic neigh table registration support 2014-11-11 15:23:54 -05:00
cipso_ipv4.c cipso: remove NULL assignment on static 2014-11-04 15:09:52 -05:00
datagram.c net: Save TX flow hash in sock and set in skbuf on xmit 2014-07-07 21:14:21 -07:00
devinet.c ipv4: fail early when creating netdev named all or default 2014-07-29 11:43:50 -07:00
esp4.c net: esp: Convert NETDEBUG to pr_info 2014-11-06 15:11:10 -05:00
fib_frontend.c ipv4: Restore accept_local behaviour in fib_validate_source() 2014-08-22 12:23:10 -07:00
fib_lookup.h
fib_rules.c ipv4: Fix incorrect error code when adding an unreachable route 2014-11-16 14:11:45 -05:00
fib_semantics.c ipv4: fix nexthop attlen check in fib_nh_match 2014-10-14 15:59:37 -04:00
fib_trie.c fib_trie: Fix trie balancing issue if new node pushes down existing node 2014-12-12 10:58:53 -05:00
fou.c gue: Call remcsum_adjust 2014-11-26 12:25:44 -05:00
geneve.c openvswitch: Fix vport_send double free 2014-12-23 23:57:31 -05:00
gre_demux.c net: Fix GRE RX to use skb_transport_header for GRE header offset 2014-09-08 15:23:05 -07:00
gre_offload.c gre: Set inner mac header in gro complete 2014-12-05 21:18:34 -08:00
icmp.c icmp: Remove some spurious dropped packet profile hits from the ICMP path 2014-11-18 15:28:28 -05:00
igmp.c ipv6: mld: fix add_grhead skb_over_panic for devs with large MTUs 2014-11-16 16:55:06 -05:00
inet_connection_sock.c ipv4: make ip_local_reserved_ports per netns 2014-05-14 15:31:45 -04:00
inet_diag.c
inet_fragment.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
inet_hashtables.c net: use reciprocal_scale() helper 2014-08-23 12:21:21 -07:00
inet_lro.c
inet_timewait_sock.c
inetpeer.c inet: remove dead inetpeer sequence code 2014-09-08 16:42:42 -07:00
ip_forward.c ipv4: try to cache dst_entries which would cause a redirect 2015-01-26 17:28:27 -08:00
ip_fragment.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
ip_gre.c gre: fix the inner mac header in nbma tunnel xmit path 2014-12-15 11:46:04 -05:00
ip_input.c
ip_options.c ipv4: rename ip_options_echo to __ip_options_echo() 2014-09-28 16:35:42 -04:00
ip_output.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
ip_sockglue.c ip: zero sockaddr returned on error queue 2015-01-15 19:41:16 -05:00
ip_tunnel_core.c ipv4: fix a potential use after free in ip_tunnel_core.c 2014-10-17 23:45:26 -04:00
ip_tunnel.c ip_tunnel: Add missing validation of encap type to ip_tunnel_encap_setup() 2014-12-16 15:20:41 -05:00
ip_vti.c ip_tunnel: the lack of vti_link_ops' dellink() cause kernel panic 2014-11-23 21:11:17 -05:00
ipcomp.c
ipconfig.c ipv4: remove 0/NULL assignment on static 2014-11-04 15:09:52 -05:00
ipip.c fou: Fix typo in returning flags in netlink 2014-11-05 22:18:20 -05:00
ipmr.c net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
Kconfig net: Move fou_build_header into fou.c and refactor 2014-11-05 16:30:02 -05:00
Makefile net: Add Geneve tunneling protocol driver 2014-10-06 00:32:20 -04:00
netfilter.c
ping.c ping: Fix race in free in receive path 2015-01-27 00:04:53 -08:00
proc.c tcp_cubic: add SNMP counters to track how effective is Hystart 2014-12-09 14:58:23 -05:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
route.c ipv4: try to cache dst_entries which would cause a redirect 2015-01-26 17:28:27 -08:00
syncookies.c net: allow setting ecn via routing table 2014-11-04 16:06:09 -05:00
sysctl_net_ipv4.c tcp: allow for bigger reordering level 2014-10-29 15:05:15 -04:00
tcp_bic.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_cong.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_cubic.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_dctcp.c net: tcp: add DCTCP congestion control algorithm 2014-09-29 00:13:10 -04:00
tcp_diag.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_fastopen.c tcp: remove unnecessary assignment. 2014-09-29 12:31:12 -04:00
tcp_highspeed.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_htcp.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_hybla.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_illinois.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_input.c switch tcp_sock->ucopy from iovec (ucopy.iov) to msghdr (ucopy.msg) 2014-12-09 16:28:22 -05:00
tcp_ipv4.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-12-10 15:48:20 -05:00
tcp_lp.c
tcp_memcontrol.c mm: memcontrol: lockless page counters 2014-12-10 17:41:04 -08:00
tcp_metrics.c tcp: don't allow syn packets without timestamps to pass tcp_tw_recycle logic 2014-08-14 14:38:54 -07:00
tcp_minisocks.c tcp: change TCP_ECN prefixes to lower case 2014-09-29 14:41:22 -04:00
tcp_offload.c net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
tcp_output.c tcp: Do not apply TSO segment limit to non-TSO packets 2015-01-02 16:13:20 -05:00
tcp_probe.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_scalable.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_timer.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
tcp_vegas.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_vegas.h
tcp_veno.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_westwood.c net: tcp: split ack slow/fast events from cwnd_event 2014-09-29 00:13:10 -04:00
tcp_yeah.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp.c Merge branch 'for-davem-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-12-10 13:17:23 -05:00
tunnel4.c
udp_diag.c udp_diag: Fix socket skipping within chain 2015-01-27 00:02:41 -08:00
udp_impl.h
udp_offload.c net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
udp_tunnel.c udp-tunnel: Add a few more UDP tunnel APIs 2014-09-19 15:57:15 -04:00
udp.c ip_generic_getfrag, udplite_getfrag: switch to passing msghdr 2014-12-09 16:28:22 -05:00
udplite.c net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c inetpeer: get rid of ip_id_count 2014-06-02 11:00:41 -07:00
xfrm4_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-05-24 00:32:30 -04:00
xfrm4_policy.c
xfrm4_protocol.c xfrm4: Remove duplicate semicolon 2014-06-30 07:49:47 +02:00
xfrm4_state.c
xfrm4_tunnel.c