iostat can only track the whole device's io statistics. This patch
introduces iostat per cgroup based on blk-rq-qos framework which
can track bw, iops, queue latency and device latency and distinguish
regular or meta data. The blkio.iostat per cgroup output in following
format,
vda-data bytes iops queue_lat dev_lat [ditto]  [ditto]
    meta   \___________ ______________/    |        |
	               v                   v        v
	             read               write   discard
In particular, the blkio.iostat of root only output the statistics
of IOs from root cgroup. However, the non-root blkio.iostat outputs
all of the children cgroups. With meta stats in root cgroup, hope
to observe the performace of fs metadata.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

After blk_update_request, the bios can be gone. We cannot track
the req in cgroup fashion in following IO completion path. This
patch add blkcg_gq into request, get it when install bio, put it
before request is released.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

No functional changes here

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

Make blk-ioprio pluggable and modular. Then we can close or open
it through /sys/block/xxx/queue/qos and rmmod the module if we don't
need it which can release one blkcg policy slot.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

In next patch, blk-ioprio.c is changed to a module named ioprio.ko.
Rename ioprio.c to ioprio-common.c to avoid same ioprio.o in Makefile

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

Make blk-iocost pluggable and modular. Then we can close or open
it through /sys/block/xxx/queue/qos and rmmod the module if we don't
need it which can release one blkcg policy slot.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

This is a preparation to make iocost modular

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

Remove it as nobody use it any more.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

Make blk-iolatency pluggable and modular. Then we can close or open
it through /sys/block/xxx/queue/qos and rmmod the module if we don't
need it which can release one blkcg policy slot.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

This is a preparation for making blk-rq-qos modular, there is no
functional change, but just export interfaces pr_cont_cgroup_path
and cgroup_parse_float.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

This is a preparation for making blk-rq-qos policyies modular,
there is no functional change.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

This patch makes wbt pluggable through /sys/block/xxx/queue/qos.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

blk-rq-qos is a standalone framework out of io-sched and can be
used to control or observe the IO progress in block-layer with
hooks. blk-rq-qos is a great design but right now, it is totally
fixed and built-in and shut out peoples who want to use it with
external module.

This patch make blk-rq-qos policies pluggable and modular.
(1) Add code to maintain the rq_qos_ops. A rq-qos module need to
    register itself with rq_qos_register(). The original enum
    rq_qos_id will be removed in following patch. They will use
    a dynamic id maintained by rq_qos_ida.
(2) Add .init callback into rq_qos_ops. We use it to initialize the
    resource.
(3) Add /sys/block/x/queue/qos
    We can use '+name' or "-name" to open or close the blk-rq-qos
    policy.

Because the rq-qos list can be modified at anytime, rq_qos_id()
which has been renamed to rq_qos_by_id() has to iterate the list
under sysfs_lock or queue_lock. This patch adapts the code for this.
More details, please refer to the comment above rq_qos_get(), And
the rq_qos_exit() is moved to blk_cleanup_queue. Except for these
modification, there is no other functional change here. Following
patches will adpat the code of wbt, iolatency, iocost and ioprio
to make them pluggable and modular one by one.

Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>

Convert 'allowed' in __cpuset_node_allowed() to be boolean since the
return types of node_isset() and __cpuset_node_allowed() are both
boolean.

Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

After commit dc26532 ("cgroup: rstat: punt root-level optimization to
individual controllers"), each rstat on updated_children list has its
->updated_next not NULL.

This means we can remove the check on ->updated_next, if we make sure
the subtree from @root is on list, which could be done by checking
updated_next for root.

tj: Coding style fixes.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Instead of do while unconditionally, let's put the loop variant in
while.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

…n checks

When a task is writing to an fd opened by a different task, the perm check
should use the cgroup namespace of the latter task. Add a test for it.

Tested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

When a task is writing to an fd opened by a different task, the perm check
should use the credentials of the latter task. Add a test for it.

Tested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

…f 0644

0644 is an odd perm to create a cgroup which is a directory. Use the regular
0755 instead. This is necessary for euid switching test case.

Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

cgroup process migration permission checks are performed at write time as
whether a given operation is allowed or not is dependent on the content of
the write - the PID. This currently uses current's cgroup namespace which is
a potential security weakness as it may allow scenarios where a less
privileged process tricks a more privileged one into writing into a fd that
it created.

This patch makes cgroup remember the cgroup namespace at the time of open
and uses it for migration permission checks instad of current's. Note that
this only applies to cgroup2 as cgroup1 doesn't have namespace support.

This also fixes a use-after-free bug on cgroupns reported in

 https://lore.kernel.org/r/00000000000048c15c05d0083397@google.com

Note that backporting this fix also requires the preceding patch.

Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Reported-by: syzbot+50f5cf33a284ce738b62@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/00000000000048c15c05d0083397@google.com
Fixes: 5136f63 ("cgroup: implement "nsdelegate" mount option")
Signed-off-by: Tejun Heo <tj@kernel.org>

of->priv is currently used by each interface file implementation to store
private information. This patch collects the current two private data usages
into struct cgroup_file_ctx which is allocated and freed by the common path.
This allows generic private data which applies to multiple files, which will
be used to in the following patch.

Note that cgroup_procs iterator is now embedded as procs.iter in the new
cgroup_file_ctx so that it doesn't need to be allocated and freed
separately.

v2: union dropped from cgroup_file_ctx and the procs iterator is embedded in
    cgroup_file_ctx as suggested by Linus.

v3: Michal pointed out that cgroup1's procs pidlist uses of->priv too.
    Converted. Didn't change to embedded allocation as cgroup1 pidlists get
    stored for caching.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Michal Koutný <mkoutny@suse.com>

cgroup process migration permission checks are performed at write time as
whether a given operation is allowed or not is dependent on the content of
the write - the PID. This currently uses current's credentials which is a
potential security weakness as it may allow scenarios where a less
privileged process tricks a more privileged one into writing into a fd that
it created.

This patch makes both cgroup2 and cgroup1 process migration interfaces to
use the credentials saved at the time of open (file->f_cred) instead of
current's.

Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Fixes: 187fe84 ("cgroup: require write perm on common ancestor when moving processes on the default hierarchy")
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

…el/git/netdev/net

Pull networking fixes from Jakub Kicinski"
 "Networking fixes, including fixes from bpf, and WiFi. One last pull
  request, turns out some of the recent fixes did more harm than good.

  Current release - regressions:

   - Revert "xsk: Do not sleep in poll() when need_wakeup set", made the
     problem worse

   - Revert "net: phy: fixed_phy: Fix NULL vs IS_ERR() checking in
     __fixed_phy_register", broke EPROBE_DEFER handling

   - Revert "net: usb: r8152: Add MAC pass-through support for more
     Lenovo Docks", broke setups without a Lenovo dock

  Current release - new code bugs:

   - selftests: set amt.sh executable

  Previous releases - regressions:

   - batman-adv: mcast: don't send link-local multicast to mcast routers

  Previous releases - always broken:

   - ipv4/ipv6: check attribute length for RTA_FLOW / RTA_GATEWAY

   - sctp: hold endpoint before calling cb in
     sctp_transport_lookup_process

   - mac80211: mesh: embed mesh_paths and mpp_paths into
     ieee80211_if_mesh to avoid complicated handling of sub-object
     allocation failures

   - seg6: fix traceroute in the presence of SRv6

   - tipc: fix a kernel-infoleak in __tipc_sendmsg()"

* tag 'net-5.16-final' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (36 commits)
  selftests: set amt.sh executable
  Revert "net: usb: r8152: Add MAC passthrough support for more Lenovo Docks"
  sfc: The RX page_ring is optional
  iavf: Fix limit of total number of queues to active queues of VF
  i40e: Fix incorrect netdev's real number of RX/TX queues
  i40e: Fix for displaying message regarding NVM version
  i40e: fix use-after-free in i40e_sync_filters_subtask()
  i40e: Fix to not show opcode msg on unsuccessful VF MAC change
  ieee802154: atusb: fix uninit value in atusb_set_extended_addr
  mac80211: mesh: embedd mesh_paths and mpp_paths into ieee80211_if_mesh
  mac80211: initialize variable have_higher_than_11mbit
  sch_qfq: prevent shift-out-of-bounds in qfq_init_qdisc
  netrom: fix copying in user data in nr_setsockopt
  udp6: Use Segment Routing Header for dest address if present
  icmp: ICMPV6: Examine invoking packet for Segment Route Headers.
  seg6: export get_srh() for ICMP handling
  Revert "net: phy: fixed_phy: Fix NULL vs IS_ERR() checking in __fixed_phy_register"
  ipv6: Do cleanup if attribute validation fails in multipath route
  ipv6: Continue processing multipath route even if gateway attribute is invalid
  net/fsl: Remove leftover definition in xgmac_mdio
  ...

amt.sh test script will not work because it doesn't have execution
permission. So, it adds execution permission.

Reported-by: Hangbin Liu <liuhangbin@gmail.com>
Fixes: c08e8ba ("selftests: add amt interface selftest script")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20220105144436.13415-1-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

…Docks"

This reverts commit f77b83b.

This change breaks multiple usb to ethernet dongles attached on Lenovo
USB hub.

Fixes: f77b83b ("net: usb: r8152: Add MAC passthrough support for more Lenovo Docks")
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Link: https://lore.kernel.org/r/20220105155102.8557-1-aaron.ma@canonical.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

…x/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:
 "Here are two last fixes for this release cycle from the GPIO
  subsystem:

   - fix irq offset calculation in gpio-aspeed-sgpio

   - update the MAINTAINERS entry for gpio-brcmstb"

* tag 'gpio-fixes-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  MAINTAINERS: update gpio-brcmstb maintainers
  gpio: gpio-aspeed-sgpio: Fix wrong hwirq base in irq handler

…/scm/linux/kernel/git/sschmidt/wpan

Stefan Schmidt says:

====================
pull-request: ieee802154 for net 2022-01-05

Below I have a last minute fix for the atusb driver.

Pavel fixes a KASAN uninit report for the driver. This version is the
minimal impact fix to ease backporting. A bigger rework of the driver to
avoid potential similar problems is ongoing and will come through net-next
when ready.

* tag 'ieee802154-for-net-2022-01-05' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan:
  ieee802154: atusb: fix uninit value in atusb_set_extended_addr
====================

Link: https://lore.kernel.org/r/20220105153914.512305-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

…/tnguy/net-queue

Tony Nguyen says:

====================
Intel Wired LAN Driver Updates 2022-01-04

This series contains updates to i40e and iavf drivers.

Mateusz adjusts displaying of failed VF MAC message when the failure is
expected as well as modifying an NVM info message to not confuse the user
for i40e.

Di Zhu fixes a use-after-free issue MAC filters for i40e.

Jedrzej fixes an issue with misreporting of Rx and Tx queues during
reinitialization for i40e.

Karen correct checking of channel queue configuration to occur against
active queues for iavf.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

The RX page_ring is an optional feature that improves
performance. When allocation fails the driver can still
function, but possibly with a lower bandwidth.
Guard against dereferencing a NULL page_ring.

Fixes: 2768935 ("sfc: reuse pages to avoid DMA mapping/unmapping costs")
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Reported-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/164111288276.5798.10330502993729113868.stgit@palantir17.mph.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

In the absence of this validation, if the user requests to
configure queues more than the enabled queues, it results in
sending the requested number of queues to the kernel stack
(due to the asynchronous nature of VF response), in which
case the stack might pick a queue to transmit that is not
enabled and result in Tx hang. Fix this bug by
limiting the total number of queues allocated for VF to
active queues of VF.

Fixes: d5b33d0 ("i40evf: add ndo_setup_tc callback to i40evf")
Signed-off-by: Ashwin Vijayavel <ashwin.vijayavel@intel.com>
Signed-off-by: Karen Sornek <karen.sornek@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

There was a wrong queues representation in sysfs during
driver's reinitialization in case of online cpus number is
less than combined queues. It was caused by stopped
NetworkManager, which is responsible for calling vsi_open
function during driver's initialization.
In specific situation (ex. 12 cpus online) there were 16 queues
in /sys/class/net/<iface>/queues. In case of modifying queues with
value higher, than number of online cpus, then it caused write
errors and other errors.
Add updating of sysfs's queues representation during driver
initialization.

Fixes: 41c445f ("i40e: main driver core")
Signed-off-by: Lukasz Cieplicki <lukaszx.cieplicki@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

When loading the i40e driver, it prints a message like: 'The driver for the
device detected a newer version of the NVM image v1.x than expected v1.y.
Please install the most recent version of the network driver.' This is
misleading as the driver is working as expected.

Fix that by removing the second part of message and changing it from
dev_info to dev_dbg.

Fixes: 4fb29bd ("i40e: The driver now prints the API version in error message")
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>