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Filename Latest commit message Latest commit date
Juergen Gross 0d99b3c6bd xen/netback: don't queue unlimited number of packages 
commit be81992f9086b230623ae3ebbc85ecee4d00a3d3 upstream.

In case a guest isn't consuming incoming network traffic as fast as it
is coming in, xen-netback is buffering network packages in unlimited
numbers today. This can result in host OOM situations.

Commit f48da8b14d ("xen-netback: fix unlimited guest Rx internal
queue and carrier flapping") meant to introduce a mechanism to limit
the amount of buffered data by stopping the Tx queue when reaching the
data limit, but this doesn't work for cases like UDP.

When hitting the limit don't queue further SKBs, but drop them instead.
In order to be able to tell Rx packages have been dropped increment the
rx_dropped statistics counter in this case.

It should be noted that the old solution to continue queueing SKBs had
the additional problem of an overflow of the 32-bit rx_queue_len value
would result in intermittent Tx queue enabling.

This is part of XSA-392

Fixes: f48da8b14d ("xen-netback: fix unlimited guest Rx internal queue and carrier flapping")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-22 09:29:41 +01:00
arch ARM: dts: imx6ull-pinfunc: Fix CSI_DATA07__ESAI_TX0 pad name 2021-12-22 09:29:39 +01:00
block block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2) 2021-12-14 14:49:02 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-17 09:48:40 +01:00
Documentation dt-bindings: net: Reintroduce PHY no lane swap binding 2021-12-14 14:49:03 +01:00
drivers xen/netback: don't queue unlimited number of packages 2021-12-22 09:29:41 +01:00
fs ovl: fix warning in ovl_create_real() 2021-12-22 09:29:40 +01:00
include net: sched: Fix suspicious RCU usage while accessing tcf_tunnel_info 2021-12-22 09:29:40 +01:00
init
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel rcu: Mark accesses to rcu_state.n_force_qs 2021-12-22 09:29:40 +01:00
lib siphash: use _unaligned version by default 2021-12-08 09:01:12 +01:00
LICENSES
mm memblock: ensure there is no overflow in memblock_overlaps_region() 2021-12-17 10:12:24 +01:00
net Revert "xsk: Do not sleep in poll() when need_wakeup set" 2021-12-22 09:29:40 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts recordmcount.pl: look for jgnop instruction as well as bcrl on s390 2021-12-22 09:29:35 +01:00
security selinux: fix race condition when computing ocontext SIDs 2021-12-17 10:12:24 +01:00
sound ASoC: qdsp6: q6routing: Fix return value from msm_routing_put_audio_mixer 2021-12-14 14:49:03 +01:00
tools selftest/net/forwarding: declare NETIFS p9 p10 2021-12-22 09:29:36 +01:00
usr
virt KVM: do not shrink halt_poll_ns below grow_start 2021-10-09 14:39:50 +02:00
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Makefile Linux 5.4.167 2021-12-17 10:12:25 +01:00
README

README 

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

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.