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mirror-linux/net/ipv4
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Jakub Kicinski b025461303 tcp: update window_clamp when SO_RCVBUF is set 
Commit under Fixes moved recomputing the window clamp to
tcp_measure_rcv_mss() (when scaling_ratio changes).
I suspect it missed the fact that we don't recompute the clamp
when rcvbuf is set. Until scaling_ratio changes we are
stuck with the old window clamp which may be based on
the small initial buffer. scaling_ratio may never change.

Inspired by Eric's recent commit d1361840f8 ("tcp: fix
SO_RCVLOWAT and RCVBUF autotuning") plumb the user action
thru to TCP and have it update the clamp.

A smaller fix would be to just have tcp_rcvbuf_grow()
adjust the clamp even if SOCK_RCVBUF_LOCK is set.
But IIUC this is what we were trying to get away from
in the first place.

Fixes: a2cbb16039 ("tcp: Update window clamping condition")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Eric Dumazet <edumaze@google.com>
Link: https://patch.msgid.link/20260408001438.129165-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
 		2026-04-13 15:32:35 +02:00
..
netfilter netfilter: nf_tables: remove register tracking infrastructure 2026-02-25 19:36:26 -08:00
Kconfig ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs 2026-03-29 11:21:22 -07:00
Makefile ipv4: Retire UDP-Lite. 2026-03-13 18:57:44 -07:00
af_inet.c tcp: update window_clamp when SO_RCVBUF is set 2026-04-13 15:32:35 +02:00
ah4.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
arp.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
bpf_tcp_ca.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
cipso_ipv4.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
datagram.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
devinet.c ipv4: validate IPV4_DEVCONF attributes properly 2026-03-14 09:52:30 -07:00
esp4.c esp: fix skb leak with espintcp and async crypto 2026-02-25 09:11:40 +01:00
esp4_offload.c xfrm: Fix inner mode lookup in tunnel mode GSO segmentation 2025-12-04 09:54:53 +01:00
fib_frontend.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_lookup.h ipv4: fib: Annotate access to struct fib_alias.fa_state. 2026-01-28 19:33:07 -08:00
fib_notifier.c
…
fib_rules.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_semantics.c ipv4: drop ipv6_stub usage and use direct function calls 2026-03-29 11:21:23 -07:00
fib_trie.c ipv4: fib: Annotate access to struct fib_alias.fa_state. 2026-01-28 19:33:07 -08:00
fou_bpf.c
…
fou_core.c fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err(). 2026-03-17 16:10:59 -07:00
fou_nl.c fou: Don't allow 0 for FOU_ATTR_IPPROTO. 2026-01-17 16:00:24 -08:00
fou_nl.h tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
gre_demux.c gre: Count GRE packet drops 2026-04-12 12:33:33 -07:00
gre_offload.c
…
icmp.c ipv4: icmp: fix null-ptr-deref in icmp_build_probe() 2026-04-03 15:46:17 -07:00
igmp.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
igmp_internal.h netlink: support dumping IPv4 multicast addresses 2025-02-11 11:26:53 +01:00
inet_connection_sock.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
inet_diag.c inet_diag: report delayed ack timer information 2026-03-06 16:32:26 -08:00
inet_fragment.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
inet_hashtables.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
inet_timewait_sock.c inet: Avoid ehash lookup race in inet_twsk_hashdance_schedule() 2025-10-17 16:08:43 -07:00
inetpeer.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
ip_forward.c
…
ip_fragment.c inet: frags: flush pending skbs in fqdir_pre_exit() 2025-12-10 01:15:27 -08:00
ip_gre.c gre: Count GRE packet drops 2026-04-12 12:33:33 -07:00
ip_input.c tcp: move tcp_v4_early_demux() to net/ipv4/ip_input.c 2026-03-09 18:50:24 -07:00
ip_options.c net: Switch to skb_dstref_steal/skb_dstref_restore for ip_route_input callers 2025-08-19 17:54:35 -07:00
ip_output.c ipv4: use dst4_mtu() instead of dst_mtu() 2026-02-02 17:49:29 -08:00
ip_sockglue.c net: remove addr_len argument of recvmsg() handlers 2026-03-02 18:17:17 -08:00
ip_tunnel.c ipv4: ip_tunnel: spread netdev_lockdep_set_classes() 2026-01-08 18:02:35 -08:00
ip_tunnel_core.c net: Add net_cookie to Dead loop messages 2026-04-12 09:05:02 -07:00
ip_vti.c ipv4: adopt dst_dev, skb_dst_dev and skb_dst_dev_net[_rcu] 2025-07-02 14:32:30 -07:00
ipcomp.c xfrm: delete x->tunnel as we delete x 2025-07-08 13:28:27 +02:00
ipconfig.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ipip.c netfilter: flowtable: Add IPIP rx sw acceleration 2025-11-28 00:00:38 +00:00
ipmr.c ipmr: Don't hold RTNL for ipmr_rtm_route(). 2026-03-02 18:49:41 -08:00
ipmr_base.c inet: remove leftover EXPORT_SYMBOL() 2026-04-03 15:07:46 -07:00
metrics.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
netfilter.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
netlink.c
…
nexthop.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-04-09 13:20:59 -07:00
ping.c net: change sock_queue_rcv_skb_reason() to return a drop_reason 2026-04-12 14:30:25 -07:00
proc.c udp: Remove UDP-Lite SNMP stats. 2026-03-13 18:57:44 -07:00
protocol.c
…
raw.c net: change sock_queue_rcv_skb_reason() to return a drop_reason 2026-04-12 14:30:25 -07:00
raw_diag.c inet_diag: change inet_diag_bc_sk() first argument 2025-08-29 19:29:24 -07:00
route.c ipv4: drop ipv6_stub usage and use direct function calls 2026-03-29 11:21:23 -07:00
syncookies.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
sysctl_net_ipv4.c inet: add ip_local_port_step_width sysctl to improve port usage distribution 2026-03-10 18:59:39 -07:00
tcp.c tcp: update window_clamp when SO_RCVBUF is set 2026-04-13 15:32:35 +02:00
tcp_ao.c net/tcp-ao: Fix MAC comparison to be constant-time 2026-03-03 17:16:54 -08:00
tcp_bbr.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tcp_bic.c
…
tcp_bpf.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-03-05 12:11:05 -08:00
tcp_cdg.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
tcp_cong.c tcp: ECT_1_NEGOTIATION and NEEDS_ACCECN identifiers 2026-02-03 15:13:24 +01:00
tcp_cubic.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tcp_dctcp.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tcp_dctcp.h net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
tcp_diag.c inet_diag: report delayed ack timer information 2026-03-06 16:32:26 -08:00
tcp_fastopen.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
tcp_highspeed.c
…
tcp_htcp.c
…
tcp_hybla.c
…
tcp_illinois.c
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tcp_input.c tcp: add indirect call wrapper in tcp_conn_request() 2026-04-12 09:17:03 -07:00
tcp_ipv4.c Merge branch 'net-reduce-sk_filter-and-friends-bloat' 2026-04-12 14:30:28 -07:00
tcp_lp.c net: tcp_lp: fix kernel-doc warnings and update outdated reference links 2025-10-28 17:52:44 -07:00
tcp_metrics.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
tcp_minisocks.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
tcp_nv.c
…
tcp_offload.c gro: flushing when CWR is set negatively affects AccECN 2026-02-03 15:13:24 +01:00
tcp_output.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
tcp_plb.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
tcp_recovery.c tcp: move tcp_rack_advance() to tcp_input.c 2026-01-28 19:31:51 -08:00
tcp_scalable.c
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tcp_sigpool.c compiler-context-analysis: Change __cond_acquires to take return value 2026-01-05 16:43:29 +01:00
tcp_timer.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
tcp_ulp.c
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tcp_vegas.c tcp: tcp_vegas: use tcp_vegas_cwnd_event_tx_start() 2026-03-26 20:11:53 -07:00
tcp_vegas.h tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tcp_veno.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tcp_westwood.c
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tcp_yeah.c tcp: add cwnd_event_tx_start to tcp_congestion_ops 2026-03-24 21:00:38 -07:00
tunnel4.c
…
udp.c net: change sk_filter_trim_cap() to return a drop_reason by value 2026-04-12 14:30:25 -07:00
udp_bpf.c ipv4: Retire UDP-Lite. 2026-03-13 18:57:44 -07:00
udp_diag.c udp: Don't pass udptable to IPv4 socket lookup functions. 2026-03-13 18:57:46 -07:00
udp_offload.c inet: remove leftover EXPORT_SYMBOL() 2026-04-03 15:07:46 -07:00
udp_tunnel_core.c net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
udp_tunnel_nic.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
udp_tunnel_stub.c
…
xfrm4_input.c xfrm: hold dev ref until after transport_finish NF_HOOK 2026-04-07 10:12:40 +02:00
xfrm4_output.c ipv4: adopt dst_dev, skb_dst_dev and skb_dst_dev_net[_rcu] 2025-07-02 14:32:30 -07:00
xfrm4_policy.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
xfrm4_protocol.c
…
xfrm4_state.c
…
xfrm4_tunnel.c
…