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linux/net/ipv4
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Arjun Roy 8cc351a3d4 tcp: Prevent low rmem stalls with SO_RCVLOWAT. 
[ Upstream commit 435ccfa894e35e3d4a1799e6ac030e48a7b69ef5 ]

With SO_RCVLOWAT, under memory pressure,
it is possible to enter a state where:

1. We have not received enough bytes to satisfy SO_RCVLOWAT.
2. We have not entered buffer pressure (see tcp_rmem_pressure()).
3. But, we do not have enough buffer space to accept more packets.

In this case, we advertise 0 rwnd (due to #3) but the application does
not drain the receive queue (no wakeup because of #1 and #2) so the
flow stalls.

Modify the heuristic for SO_RCVLOWAT so that, if we are advertising
rwnd<=rcv_mss, force a wakeup to prevent a stall.

Without this patch, setting tcp_rmem to 6143 and disabling TCP
autotune causes a stalled flow. With this patch, no stall occurs. This
is with RPC-style traffic with large messages.

Fixes: 03f45c883c6f ("tcp: avoid extra wakeups for SO_RCVLOWAT users")
Signed-off-by: Arjun Roy <arjunroy@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20201023184709.217614-1-arjunroy.kdev@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-01 12:01:04 +01:00
..
bpfilter
SPDX update for 5.2-rc2, round 1
2019-05-21 12:33:38 -07:00
netfilter
netfilter: nf_log: missing vlan offload tag and proto
2020-10-29 09:57:45 +01:00
af_inet.c
net: remove empty inet_exit_net
2019-08-19 18:22:54 -07:00
ah4.c
xfrm: remove type and offload_type map from xfrm_state_afinfo
2019-06-06 08:34:50 +02:00
arp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cipso_ipv4.c
netlabel: cope with NULL catmap
2020-05-20 08:20:08 +02:00
datagram.c
inet: stop leaking jiffies on the wire
2019-11-01 14:57:52 -07:00
devinet.c
devinet: fix memleak in inetdev_init()
2020-06-10 20:24:54 +02:00
esp4_offload.c
xfrm: remove the xfrm_state_put call becofe going to out_reset
2020-06-03 08:21:32 +02:00
esp4.c
xfrm: remove get_mtu indirection from xfrm_type
2019-07-01 06:16:40 +02:00
fib_frontend.c
ipv4: Initialize flowi4_multipath_hash in data path
2020-09-26 18:03:12 +02:00
fib_lookup.h
ipv4: Use accessors for fib_info nexthop data
2019-06-04 19:26:49 -07:00
fib_notifier.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fib_rules.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2019-06-07 11:00:14 -07:00
fib_semantics.c
net: Fix the arp error in some cases
2020-06-30 15:36:44 -04:00
fib_trie.c
ipv4: Silence suspicious RCU usage warning
2020-09-12 14:18:54 +02:00
fou.c
fou: Fix IPv6 netlink policy
2020-01-29 16:45:22 +01:00
gre_demux.c
gre: fix uninit-value in __iptunnel_pull_header
2020-03-18 07:17:38 +01:00
gre_offload.c
net: gre: recompute gre csum for sctp over gre tunnels
2020-08-11 15:33:40 +02:00
icmp.c
icmp: randomize the global rate limiter
2020-10-29 09:57:27 +01:00
igmp.c
net: fix __ip_mc_inc_group usage
2019-08-20 12:48:06 -07:00
inet_connection_sock.c
net: refactor bind_bucket fastreuse into helper
2020-08-19 08:16:23 +02:00
inet_diag.c
inet_diag: return classid for all socket types
2020-03-18 07:17:38 +01:00
inet_fragment.c
inet: frags: re-introduce skb coalescing for local delivery
2019-08-08 15:55:10 -07:00
inet_hashtables.c
net: initialize fastreuse on inet_inherit_port
2020-08-19 08:16:23 +02:00
inet_timewait_sock.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
inetpeer.c
inetpeer: fix data-race in inet_putpeer / inet_putpeer
2020-01-04 19:18:39 +01:00
ip_forward.c
ipv4: Revert removal of rt_uses_gateway
2019-09-20 18:23:33 -07:00
ip_fragment.c
inet: frags: re-introduce skb coalescing for local delivery
2019-08-08 15:55:10 -07:00
ip_gre.c
ip_gre: set dev->hard_header_len and dev->needed_headroom properly
2020-10-29 09:58:04 +01:00
ip_input.c
netfilter: drop bridge nf reset from nf_reset
2019-10-01 18:42:15 +02:00
ip_options.c
netfilter: nf_tables: add support for matching IPv4 options
2019-06-21 18:35:51 +02:00
ip_output.c
ip: fix tos reflection in ack and reset packets
2020-09-26 18:03:12 +02:00
ip_sockglue.c
ip_sockglue: Fix missing-check bug in ip_ra_control()
2019-05-25 11:00:50 -07:00
ip_tunnel_core.c
ip_tunnel: allow not to count pkts on tstats by setting skb's dev to NULL
2019-06-18 20:48:45 -04:00
ip_tunnel.c
ip_tunnel: fix use-after-free in ip_tunnel_lookup()
2020-06-30 15:36:46 -04:00
ip_vti.c
ip_vti: receive ipip packet by calling ip_tunnel_rcv
2020-06-03 08:21:34 +02:00
ipcomp.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2019-07-05 15:01:15 -07:00
ipconfig.c
ipconfig: add carrier_timeout kernel parameter
2019-02-01 15:24:13 -08:00
ipip.c
net: ipip: fix wrong address family in init error path
2020-06-03 08:20:52 +02:00
ipmr_base.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2019-05-07 17:22:09 -07:00
ipmr.c
net: don't return invalid table id error when we fall back to PF_UNSPEC
2020-06-03 08:20:41 +02:00
Kconfig
vti[6]: fix packet tx through bpf_redirect() in XinY cases
2020-04-01 11:02:05 +02:00
Makefile
net: Initial nexthop code
2019-05-28 21:37:30 -07:00
metrics.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
netfilter.c
netfilter: ipv4: remove useless export_symbol
2019-01-28 11:32:58 +01:00
netlink.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
nexthop.c
nexthop: Fix performance regression in nexthop deletion
2020-10-29 09:57:26 +01:00
ping.c
ipv4: fill fl4_icmp_{type,code} in ping_v4_sendmsg
2020-07-22 09:32:47 +02:00
proc.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2019-06-17 20:20:36 -07:00
protocol.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
raw_diag.c
inet_diag: return classid for all socket types
2020-03-18 07:17:38 +01:00
raw.c
netfilter: drop bridge nf reset from nf_reset
2019-10-01 18:42:15 +02:00
route.c
ipv4: Restore flowi4_oif update before call to xfrm_lookup_route
2020-10-29 09:57:23 +01:00
syncookies.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
sysctl_net_ipv4.c
tcp: correct read of TFO keys on big endian systems
2020-08-19 08:16:23 +02:00
tcp_bbr.c
tcp_bbr: improve arithmetic division in bbr_update_bw()
2020-01-29 16:45:21 +01:00
tcp_bic.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_bpf.c
bpf/sockmap: Fix kernel panic at __tcp_bpf_recvmsg
2020-06-24 17:50:42 +02:00
tcp_cdg.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_cong.c
tcp: make sure listeners don't initialize congestion-control state
2020-07-22 09:32:48 +02:00
tcp_cubic.c
tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT
2020-06-30 15:36:47 -04:00
tcp_dctcp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
tcp_dctcp.h
tcp: refactor DCTCP ECN ACK handling
2018-10-10 22:26:00 -07:00
tcp_diag.c
tcp: annotate tp->write_seq lockless reads
2019-10-13 10:13:08 -07:00
tcp_fastopen.c
tcp: correct read of TFO keys on big endian systems
2020-08-19 08:16:23 +02:00
tcp_highspeed.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_htcp.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_hybla.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_illinois.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_input.c
tcp: Prevent low rmem stalls with SO_RCVLOWAT.
2020-11-01 12:01:04 +01:00
tcp_ipv4.c
tcp: fix receive window update in tcp_add_backlog()
2020-10-14 10:33:06 +02:00
tcp_lp.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_metrics.c
tcp: refactor setting the initial congestion window
2019-05-01 11:47:54 -04:00
tcp_minisocks.c
tcp: annotate tp->snd_nxt lockless reads
2019-10-13 10:13:08 -07:00
tcp_nv.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_offload.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
tcp_output.c
tcp: allow at most one TLP probe per flight
2020-07-31 18:39:31 +02:00
tcp_rate.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
tcp_recovery.c
tcp: introduce tcp_skb_timestamp_us() helper
2018-09-21 19:37:59 -07:00
tcp_scalable.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_timer.c
tcp: add rcu protection around tp->fastopen_rsk
2019-10-13 10:13:08 -07:00
tcp_ulp.c
bpf: Sockmap/tls, push write_space updates through ulp updates
2020-01-23 08:22:45 +01:00
tcp_vegas.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_vegas.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tcp_veno.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_westwood.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp_yeah.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
tcp.c
tcp: Prevent low rmem stalls with SO_RCVLOWAT.
2020-11-01 12:01:04 +01:00
tunnel4.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
udp_diag.c
inet_diag: return classid for all socket types
2020-03-18 07:17:38 +01:00
udp_impl.h
udp: add missing rehash callback to udplite
2019-01-17 15:01:08 -08:00
udp_offload.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2019-06-22 08:59:24 -04:00
udp_tunnel.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
udp.c
udp: Improve load balancing for SO_REUSEPORT.
2020-07-31 18:39:31 +02:00
udplite.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
xfrm4_input.c
xfrm: reset transport header back to network header after all input transforms ahave been applied
2018-09-04 10:26:30 +02:00
xfrm4_output.c
xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish
2020-04-29 16:33:11 +02:00
xfrm4_policy.c
net: add bool confirm_neigh parameter for dst_ops.update_pmtu
2020-01-04 19:18:58 +01:00
xfrm4_protocol.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
xfrm4_state.c
xfrm: remove eth_proto value from xfrm_state_afinfo
2019-06-06 08:34:50 +02:00
xfrm4_tunnel.c
xfrm: remove type and offload_type map from xfrm_state_afinfo
2019-06-06 08:34:50 +02:00