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Pengcheng Yang 432f313577 tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN 
commit 62d9f1a694 upstream.

Upon receiving a cumulative ACK that changes the congestion state from
Disorder to Open, the TLP timer is not set. If the sender is app-limited,
it can only wait for the RTO timer to expire and retransmit.

The reason for this is that the TLP timer is set before the congestion
state changes in tcp_ack(), so we delay the time point of calling
tcp_set_xmit_timer() until after tcp_fastretrans_alert() returns and
remove the FLAG_SET_XMIT_TIMER from ack_flag when the RACK reorder timer
is set.

This commit has two additional benefits:
1) Make sure to reset RTO according to RFC6298 when receiving ACK, to
avoid spurious RTO caused by RTO timer early expires.
2) Reduce the xmit timer reschedule once per ACK when the RACK reorder
timer is set.

Fixes: df92c8394e ("tcp: fix xmit timer to only be reset if data ACKed/SACKed")
Link: https://lore.kernel.org/netdev/1611311242-6675-1-git-send-email-yangpc@wangsu.com
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/1611464834-23030-1-git-send-email-yangpc@wangsu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-03 23:22:23 +01:00
arch x86/entry/64/compat: Fix "x86/entry/64/compat: Preserve r8-r11 in int $0x80" 2021-02-03 23:22:22 +01:00
block block: fix use-after-free in disk_part_iter_next 2021-01-17 13:59:01 +01:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: ecdh - avoid buffer overflow in ecdh_set_secret() 2021-01-12 20:09:09 +01:00
Documentation USB: UAS: introduce a quirk to set no_write_same 2020-12-29 13:46:46 +01:00
drivers team: protect features update by RCU to avoid deadlock 2021-02-03 23:22:23 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs fs: fix lazytime expiration handling in __writeback_single_inode() 2021-01-30 13:31:17 +01:00
include tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN 2021-02-03 23:22:23 +01:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-11-05 11:06:55 +01:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:17:07 +02:00
kernel tracing: Fix race in trace_open and buffer resize call 2021-01-30 13:31:16 +01:00
lib lib/genalloc: fix the overflow when size is too big 2021-01-12 20:09:06 +01:00
mm Revert "mm/slub: fix a memory leak in sysfs_slab_add()" 2021-01-30 13:31:15 +01:00
net tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN 2021-02-03 23:22:23 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-29 13:46:56 +01:00
scripts depmod: handle the case of /sbin/depmod without /sbin in PATH 2021-01-12 20:09:06 +01:00
security dump_common_audit_data(): fix racy accesses to ->d_name 2021-01-23 15:48:43 +01:00
sound ASoC: Intel: haswell: Add missing pm_ops 2021-01-30 13:31:12 +01:00
tools x86/entry/64/compat: Preserve r8-r11 in int $0x80 2021-02-03 23:22:22 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: fix overflow of zero page refcount with ksm running 2020-10-01 13:12:33 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.218 2021-01-30 13:31:17 +01:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.