netdev - [PATCH net-next 0/3] net: sched: update default qdisc visibility after Tx queue cnt changes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 13 Sep 2021 15:53:29 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, jiri@...nulli.us,
        xiyou.wangcong@...il.com, edumazet@...gle.com,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 0/3] net: sched: update default qdisc visibility after Tx queue cnt changes

Matthew noticed that number of children reported by mq does not match
number of queues on reconfigured interfaces. For example if mq is
instantiated when there is 8 queues it will always show 8 children,
regardless of config being changed:

 # ethtool -L eth0 combined 8
 # tc qdisc replace dev eth0 root handle 100: mq
 # tc qdisc show dev eth0
 qdisc mq 100: root 
 qdisc pfifo_fast 0: parent 100:8 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:7 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:6 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:5 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:4 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:3 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:2 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:1 bands 3 priomap 1 2 ...
 # ethtool -L eth0 combined 1
 # tc qdisc show dev eth0
 qdisc mq 100: root 
 qdisc pfifo_fast 0: parent 100:8 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:7 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:6 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:5 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:4 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:3 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:2 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:1 bands 3 priomap 1 2 ...
 # ethtool -L eth0 combined 32
 # tc qdisc show dev eth0
 qdisc mq 100: root 
 qdisc pfifo_fast 0: parent 100:8 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:7 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:6 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:5 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:4 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:3 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:2 bands 3 priomap 1 2 ...
 qdisc pfifo_fast 0: parent 100:1 bands 3 priomap 1 2 ...

This patchset fixes this by hashing and unhasing the default
child qdiscs as number of queues gets adjusted.

Jakub Kicinski (3):
  net: sched: update default qdisc visibility after Tx queue cnt changes
  netdevsim: add ability to change channel count
  selftests: net: test ethtool -L vs mq

 drivers/net/netdevsim/ethtool.c               | 28 +++++++
 drivers/net/netdevsim/netdevsim.h             |  1 +
 include/net/sch_generic.h                     |  4 +
 net/core/dev.c                                |  2 +
 net/sched/sch_generic.c                       |  9 +++
 net/sched/sch_mq.c                            | 24 ++++++
 net/sched/sch_mqprio.c                        | 23 ++++++
 .../drivers/net/netdevsim/ethtool-common.sh   |  2 +-
 .../drivers/net/netdevsim/tc-mq-visibility.sh | 77 +++++++++++++++++++
 9 files changed, 169 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/drivers/net/netdevsim/tc-mq-visibility.sh

-- 
2.31.1