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Willem de Bruijn a0bc96c0cd selftests: net: verify fq per-band packet limit 
Commit 29f834aa32 ("net_sched: sch_fq: add 3 bands and WRR
scheduling") introduces multiple traffic bands, and per-band maximum
packet count.

Per-band limits ensures that packets in one class cannot fill the
entire qdisc and so cause DoS to the traffic in the other classes.

Verify this behavior:
  1. set the limit to 10 per band
  2. send 20 pkts on band A: verify that 10 are queued, 10 dropped
  3. send 20 pkts on band A: verify that  0 are queued, 20 dropped
  4. send 20 pkts on band B: verify that 10 are queued, 10 dropped

Packets must remain queued for a period to trigger this behavior.
Use SO_TXTIME to store packets for 100 msec.

The test reuses existing upstream test infra. The script is a fork of
cmsg_time.sh. The scripts call cmsg_sender.

The test extends cmsg_sender with two arguments:

* '-P' SO_PRIORITY
  There is a subtle difference between IPv4 and IPv6 stack behavior:
  PF_INET/IP_TOS        sets IP header bits and sk_priority
  PF_INET6/IPV6_TCLASS  sets IP header bits BUT NOT sk_priority

* '-n' num pkts
  Send multiple packets in quick succession.
  I first attempted a for loop in the script, but this is too slow in
  virtualized environments, causing flakiness as the 100ms timeout is
  reached and packets are dequeued.

Also do not wait for timestamps to be queued unless timestamps are
requested.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20231116203449.2627525-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-11-20 17:48:36 -08:00
arch acpi/processor: sanitize _OSC/_PDC capabilities for Xen dom0 2023-11-13 07:22:00 +01:00
block blk-core: use pr_warn_ratelimited() in bio_check_ro() 2023-11-07 08:15:23 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto This push fixes a regression in ahash and hides the Kconfig sub-options for the jitter RNG. 2023-11-09 17:04:58 -08:00
Documentation net: partial revert of the "Make timestamping selectable: series 2023-11-18 18:42:37 -08:00
drivers net: microchip: lan743x : bidirectional throughput improvement 2023-11-20 17:47:30 -08:00
fs for-6.7-rc1-tag 2023-11-13 09:09:12 -08:00
include rtnetlink: introduce nlmsg_new_large and use it in rtnl_getlink 2023-11-18 20:18:25 -08:00
init As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
io_uring io_uring: do not clamp read length for multishot read 2023-11-06 13:41:58 -07:00
ipc Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
kernel Including fixes from BPF and netfilter. 2023-11-16 07:51:26 -05:00
lib Zstd fixes for v6.7 2023-11-14 23:35:31 -05:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm memblock: report failures when memblock_can_resize is not set 2023-11-08 09:40:13 -08:00
net rtnetlink: introduce nlmsg_new_large and use it in rtnl_getlink 2023-11-18 20:18:25 -08:00
rust Kbuild updates for v6.7 2023-11-04 08:07:19 -10:00
samples Landlock updates for v6.7-rc1 2023-11-03 09:28:53 -10:00
scripts kernel hardening fixes for v6.7-rc2 2023-11-14 23:47:12 -05:00
security + Features 2023-11-03 09:48:17 -10:00
sound sound fixes for 6.7-rc1 2023-11-10 11:57:51 -08:00
tools selftests: net: verify fq per-band packet limit 2023-11-20 17:48:36 -08:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/ 2023-10-03 20:49:09 +09:00
.mailmap As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
.rustfmt.toml
COPYING
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS Including fixes from BPF and netfilter. 2023-11-16 07:51:26 -05:00
Makefile Linux 6.7-rc1 2023-11-12 16:19:07 -08:00
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.