Add SO_PEERPIDFD which allows to get pidfd of peer socket holder pidfd.
This thing is direct analog of SO_PEERCRED which allows to get plain PID.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: David Ahern <dsahern@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Kuniyuki Iwashima <kuniyu@amazon.com>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Cc: Luca Boccassi <bluca@debian.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Stanislav Fomichev <sdf@google.com>
Cc: bpf@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Reviewed-by: Christian Brauner <brauner@kernel.org>
Acked-by: Stanislav Fomichev <sdf@google.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Implement SCM_PIDFD, a new type of CMSG type analogical to SCM_CREDENTIALS,
but it contains pidfd instead of plain pid, which allows programmers not
to care about PID reuse problem.

We mask SO_PASSPIDFD feature if CONFIG_UNIX is not builtin because
it depends on a pidfd_prepare() API which is not exported to the kernel
modules.

Idea comes from UAPI kernel group:
https://uapi-group.org/kernel-features/

Big thanks to Christian Brauner and Lennart Poettering for productive
discussions about this.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: David Ahern <dsahern@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Kuniyuki Iwashima <kuniyu@amazon.com>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Cc: Luca Boccassi <bluca@debian.org>
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Tested-by: Luca Boccassi <bluca@debian.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Petr Machata says:

====================
mlxsw: Cleanups in router code

This patchset moves some router-related code from spectrum.c to
spectrum_router.c where it should be. It also simplifies handlers of
netevent notifications.

- Patch #1 caches router pointer in a dedicated variable. This obviates the
  need to access the same as mlxsw_sp->router, making lines shorter, and
  permitting a future patch to add code that fits within 80 character
  limit.

- Patch #2 moves IP / IPv6 validation notifier blocks from spectrum.c
  to spectrum_router, where the handlers are anyway.

- In patch #3, pass router pointer to scheduler of deferred work directly,
  instead of having it deduce it on its own.

- This makes the router pointer available in the handler function
  mlxsw_sp_router_netevent_event(), so in patch #4, use it directly,
  instead of finding it through mlxsw_sp_port.

- In patch #5, extend mlxsw_sp_router_schedule_work() so that the
  NETEVENT_NEIGH_UPDATE handler can use it directly instead of inlining
  equivalent code.

- In patches #6 and #7, add helpers for two common operations involving
  a backing netdev of a RIF. This makes it unnecessary for the function
  mlxsw_sp_rif_dev() to be visible outside of the router module, so in
  patch #8, hide it.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Now that the external users of mlxsw_sp_rif_dev() have been converted in
the preceding patches, make the function static.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In a number of places, a netdevice underlying a RIF is obtained only to
compare it to another pointer. In order to clean up the interface between
the router and the other modules, add a new helper to specifically answer
this question, and convert the relevant uses to this new interface.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In a number of places, a netdevice underlying a RIF is obtained only to
check if it a NULL pointer. In order to clean up the interface between the
router and the other modules, add a new helper to specifically answer this
question, and convert the relevant uses to this new interface.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After the struct mlxsw_sp_netevent_work.n field initialization is moved
here, the body of code that handles NETEVENT_NEIGH_UPDATE is almost
identical to the one in the helper function. Therefore defer to the helper
instead of inlining the equivalent.

Note that previously, the code took and put a reference of the netdevice.
The new code defers to mlxsw_sp_dev_lower_is_port() to obviate the need for
taking the reference.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This code handles NETEVENT_DELAY_PROBE_TIME_UPDATE, which is invoked every
time the delay_probe_time changes. mlxsw router currently only maintains
one timer, so the last delay_probe_time set wins.

Currently, mlxsw uses mlxsw_sp_port_lower_dev_hold() to find a reference to
the router. This is no longer necessary. But as a side effect, this makes
sure that only updates to "interesting netdevices" (ones that have a
physical netdevice lower) are projected.

Retain that side effect by calling mlxsw_sp_port_dev_lower_find_rcu() and
punting if there is none. Then just proceed using the router pointer that's
already at hand in the helper.

Note that previously, the code took and put a reference of the netdevice.
Because the mlxsw_sp pointer is now obtained from the notifier block, the
port pointer (non-) NULL-ness is all that's relevant, and the reference
does not need to be taken anymore.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Instead of passing a notifier block and deducing the router pointer from
that in the helper, do that in the caller, and pass the result. In the
following patches, the pointer will also be made useful in the caller.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The validation logic is already in the router code. Move there the notifier
blocks themselves as well.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make mlxsw_sp_router_fini() more similar to the _init() function (and more
concise) by extracting the `router' handle to a named variable and using
that throughout. The availability of a dedicated `router' variable will
come in handy in following patches.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since its introduction, the ovs module execute_hash action allowed
hash algorithms other than the skb->l4_hash to be used.  However,
additional hash algorithms were not implemented.  This means flows
requiring different hash distributions weren't able to use the
kernel datapath.

Now, introduce support for symmetric hashing algorithm as an
alternative hash supported by the ovs module using the flow
dissector.

Output of flow using l4_sym hash:

    recirc_id(0),in_port(3),eth(),eth_type(0x0800),
    ipv4(dst=64.0.0.0/192.0.0.0,proto=6,frag=no), packets:30473425,
    bytes:45902883702, used:0.000s, flags:SP.,
    actions:hash(sym_l4(0)),recirc(0xd)

Some performance testing with no GRO/GSO, two veths, single flow:

    hash(l4(0)):      4.35 GBits/s
    hash(l4_sym(0)):  4.24 GBits/s
Signed-off-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Vladimir Oltean says:

====================
Fixes for taprio xstats

1. Taprio classes correspond to TXQs, and thus, class stats are TXQ
   stats not TC stats.
2. Drivers reporting taprio xstats should report xstats for *this*
   taprio, not for a previous one.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently, the window_drop stats persist even if an incorrect Qdisc was
removed from the interface and a new one is installed. This is because
the enetc driver keeps the state, and that is persistent across multiple
Qdiscs.

To resolve the issue, clear all win_drop counters from all TX queues
when the currently active Qdisc is removed. These counters are zero
by default. The counters visible in ethtool -S are also affected,
but I don't care very much about preserving those enough to keep them
monotonically incrementing.

Fixes: 4802fca8 ("net: enetc: report statistics counters for taprio")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The taprio Qdisc creates child classes per netdev TX queue, but
taprio_dump_class_stats() currently reports offload statistics per
traffic class. Traffic classes are groups of TXQs sharing the same
dequeue priority, so this is incorrect and we shouldn't be bundling up
the TXQ stats when reporting them, as we currently do in enetc.

Modify the API from taprio to drivers such that they report TXQ offload
stats and not TC offload stats.

There is no change in the UAPI or in the global Qdisc stats.

Fixes: 6c1adb65 ("net/sched: taprio: add netlink reporting for offload statistics counters")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use a __be16 variable to store the big endian value of header in
nxp_nci_i2c_fw_read().

Flagged by Sparse as:

 .../i2c.c:113:22: warning: cast to restricted __be16

No functional changes intended.
Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

To support vlan, use MANA_LONG_PKT_FMT if vlan tag is present in TX
skb. Then extract the vlan tag from the skb struct, and save it to
tx_oob for the NIC to transmit. For vlan tags on the payload, they
are accepted by the NIC too.

For RX, extract the vlan tag from CQE and put it into skb.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Reuse the work done for EF100 to add devlink support for EF10.
There is no devlink port support for EF10.
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

./net/sched/act_pedit.c:245:21-28: WARNING opportunity for kmemdup.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5478Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Following the example of 'commit 9a0f830f ("ethtool: linkstate:
add a statistic for PHY down events")', added support for link down
events.

Add callback ionic_get_link_ext_stats to ionic_ethtool.c to support
link_down_count, a property of netdev that gets reported exclusively
on physical link down events.

Run ethtool -I <devname> to display the device link down count.
Signed-off-by: Nitya Sunkad <nitya.sunkad@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Tony Nguyen says:

====================
ice: Improve miscellaneous interrupt code

Jacob Keller says:

This series improves the driver's use of the threaded IRQ and the
communication between ice_misc_intr() and the ice_misc_intr_thread_fn()
which was previously introduced by commit 1229b339 ("ice: Add low
latency Tx timestamp read").

First, a new custom enumerated return value is used instead of a boolean for
ice_ptp_process_ts(). This significantly reduces the cognitive burden when
reviewing the logic for this function, as the expected action is clear from
the return value name.

Second, the unconditional loop in ice_misc_intr_thread_fn() is removed,
replacing it with a write to the Other Interrupt Cause register. This causes
the MAC to trigger the Tx timestamp interrupt again. This makes it possible
to safely use the ice_misc_intr_thread_fn() to handle other tasks beyond
just the Tx timestamps. It is also easier to reason about since the thread
function will exit cleanly if we do something like disable the interrupt and
call synchronize_irq().

Third, refactor the handling for external timestamp events to use the
miscellaneous thread function. This resolves an issue with the external
time stamps getting blocked while processing the periodic work function
task.

Fourth, a simplification of the ice_misc_intr() function to always return
IRQ_WAKE_THREAD, and schedule the ice service task in the
ice_misc_intr_thread_fn() instead.

Finally, the Other Interrupt Cause is kept disabled over the thread function
processing, rather than immediately re-enabled.

Special thanks to Michal Schmidt for the careful review of the series and
pointing out my misunderstandings of the kernel IRQ code. It has been
determined that the race outlined as being fixed in previous series was
actually introduced by this series itself, which I've since corrected.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds runtime pm support for 7560.

As part of probe procedure auto suspend is enabled and auto suspend
delay is set to 5000 ms for runtime pm use. Later auto flag is set
to power manage the device at run time.

On successful communication establishment between host and device the
device usage counter is dropped and request to put the device into
sleep state (suspend).

In TX path, the device usage counter is raised and device is moved out
of sleep(resume) for data transmission. In RX path, if the device has
some data to be sent it request host platform to change the power state
by giving PCI PME message.
Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Convert the bindings document for Xilinx AXI Ethernet Subsystem
from txt to yaml. No changes to existing binding description.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The iproute2 output that eventually landed upstream is different than
the one used in this test, resulting in failures. Fix by adjusting the
test to use iproute2's JSON output, which is more stable than regular
output.

Fixes: 305c0418 ("selftests: net: vxlan: Add tests for vxlan nolocalbypass option.")
Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Yoshihiro Shimoda says:

====================
net: renesas: rswitch: Improve perfromance of TX/RX

This patch series is based on net-next.git / main branch [1]. This patch
series can improve perfromance of TX in a specific condition. The previous code
used "global rate limiter" feature so that this is possible to cause
performance down if we use multiple ports at the same time. To resolve this
issue, use "hardware pause" features of GWCA and COMA. Note that this is not
related to the ethernet PAUSE frames.

< UDP TX by iperf3 >
 before: about 450Mbps on both tsn0 and tsn1
 after:  about 950Mbps on both tsn0 and tsn1

Also, this patch series can improve performance of RX by using
napi_gro_receive().

< TCP RX by iperf >
 before: about 670Mbps on tsn0
 after:  about 840Mbps on tsn0

[1]
The commit e06bd5e3 ("Merge branch 'followup-fixes-for-the-dwmac-and-altera-lynx-conversion'")

Changes from v3:
https://lore.kernel.org/all/20230607015641.1724057-1-yoshihiro.shimoda.uh@renesas.com/
 - Rebased on the latest net-next.git / main branch.
 - Added Reviewed-by in the patch 2/2. (Maciej, thanks!)
 - Fix typos in the commit description in the patch 2/2.

Changes from v2:
https://lore.kernel.org/all/20230606085558.1708766-1-yoshihiro.shimoda.uh@renesas.com/
 - Rebased on the latest net-next.git / main branch.
 - Added Reviewed-by in the patch 1/2. (Maciej, thanks!)
 - Revise the commit description in the patch 2/2.
 - Add definition to remove magic hardcoded numbers in the patch 2/2.

Changes from v1:
https://lore.kernel.org/all/20230529080840.1156458-1-yoshihiro.shimoda.uh@renesas.com/
 - Rebased on the latest net-next.git / main branch.
 - Use "hardware pause" feature instead of "per-queue limiter" feature.
 - Drop refactaring for "per-queue limiter".
 - Drop dt-bindings update because "hardware pause" doesn't need additional
   clock information.
 - Use napi_gro_receive() to improve RX performance.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Since this driver used the "global rate limiter" feature of GWCA,
the TX performance of each port was reduced when multiple ports
transmitted frames simultaneously. To improve performance, remove
the use of the "global rate limiter" feature and use "hardware pause"
features of the following:
 - "per priority pause" of GWCA
 - "global pause" of COMA

Note that these features are not related to the ethernet PAUSE frame.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This hardware can receive multiple frames so that using
napi_gro_receive() instead of netif_receive_skb() gets good
performance of RX.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Edward Cree says:

====================
sfc: TC encap actions offload

This series adds support for offloading TC tunnel_key set actions to the
 EF100 driver, supporting VxLAN and GENEVE tunnels over IPv4 or IPv6.
====================

Link: https://lore.kernel.org/r/cover.1686240142.git.ecree.xilinx@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Support constructing VxLAN and GENEVE headers, on either IPv4 or IPv6,
 using the neighbouring information obtained in encap->neigh to
 populate the Ethernet header.
Note that the ef100 hardware does not insert UDP checksums when
 performing encap, so for IPv6 the remote endpoint will need to be
 configured with udp6zerocsumrx or equivalent.
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

For each neighbour we're interested in, create a struct efx_neigh_binder
 object which has a list of all the encap_actions using it.  When we
 receive a neighbouring update (through the netevent notifier), find the
 corresponding efx_neigh_binder and update all its users.
Since the actual generation of encap headers is still only a stub, the
 resulting rules still get left on fallback actions.
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Besides the raw header data, also pass the tunnel type, so that the
 hardware knows it needs to update the IP Total Length and UDP Length
 fields (and corresponding checksums) for each packet.
Also, populate the ENCAP_HEADER_ID field in efx_mae_alloc_action_set()
 with the fw_id returned from efx_mae_allocate_encap_md().
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

efx_mae_update_rule() changes the action-set-list attached to an MAE
 flow rule in the Action Rule Table.
We will use this when neighbouring updates change encap actions.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Create software objects to manage the metadata for encap actions that
 can be attached to TC rules.  However, since we don't yet have the
 neighbouring information (needed to generate the Ethernet header),
 all rules with encap actions are marked as "unready" and thus insert
 the fallback action into hardware rather than actually offloading the
 encapsulation action.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

When offloading a TC encap action, the action information for the
 hardware might not be "ready": if there's currently no neighbour entry
 available for the destination address, we can't construct the Ethernet
 header to prepend to the packet.  In this case, we still offload the
 flow rule, but with its action-set-list ID pointing at a "fallback"
 action which simply delivers the packet to its default destination (as
 though no flow rule had matched), thus allowing software TC to handle
 it.  Later, when we receive a neighbouring update that allows us to
 construct the encap header, the rule will become "ready" and we will
 update its action-set-list ID in hardware to point at the actual
 offloaded actions.
This patch sets up these fallback ASLs, but does not yet use them.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Move declarations into include/net/gso.h and code into net/core/gso.c
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230608191738.3947077-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Matthieu Baerts says:

====================
mptcp: unify PM interfaces

These patches from Geliang better isolate the two MPTCP path-managers by
avoiding calling userspace PM functions from the in-kernel PM. Instead,
new functions declared in pm.c directly dispatch to the right PM.

In addition to have a clearer code, this also avoids a bit of duplicated
checks.

This is a refactoring, there is no behaviour change intended here.
====================

Link: https://lore.kernel.org/r/20230608-upstream-net-next-20230608-mptcp-unify-pm-interfaces-v1-0-b301717c9ff5@tessares.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

This patch unifies the three PM set_flags() interfaces:

mptcp_pm_nl_set_flags() in mptcp/pm_netlink.c for the in-kernel PM and
mptcp_userspace_pm_set_flags() in mptcp/pm_userspace.c for the
userspace PM.

They'll be switched in the common PM infterface mptcp_pm_set_flags() in
mptcp/pm.c based on whether token is NULL or not.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This patch unifies the three PM get_flags_and_ifindex_by_id() interfaces:

mptcp_pm_nl_get_flags_and_ifindex_by_id() in mptcp/pm_netlink.c for the
in-kernel PM and mptcp_userspace_pm_get_flags_and_ifindex_by_id() in
mptcp/pm_userspace.c for the userspace PM.

They'll be switched in the common PM infterface
mptcp_pm_get_flags_and_ifindex_by_id() in mptcp/pm.c based on whether
mptcp_pm_is_userspace() or not.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This patch unifies the three PM get_local_id() interfaces:

mptcp_pm_nl_get_local_id() in mptcp/pm_netlink.c for the in-kernel PM and
mptcp_userspace_pm_get_local_id() in mptcp/pm_userspace.c for the
userspace PM.

They'll be switched in the common PM infterface mptcp_pm_get_local_id()
in mptcp/pm.c based on whether mptcp_pm_is_userspace() or not.

Also put together the declarations of these three functions in protocol.h.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Rename local_address() with "mptcp_" prefix and export it in protocol.h.

This function will be re-used in the common PM code (pm.c) in the
following commit.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>