Setup the ASO (Advanced Steering Operation) object that is needed
for IPsec to interact with SW stack about various fast changing
events: replay window, lifetime limits,  e.t.c
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

mlx5 priv structure is driver main structure that holds high level data.
That information is not needed for IPsec flow steering logic and the
pointer to mlx5e_priv was not supposed to be passed in the first place.

This change "cleans" the logic to rely on internal to IPsec structures
without touching global mlx5e_priv.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Low level mlx5 code needs to use mlx5_core print routines and
not netdev ones, as the failures are relevant to the HW itself
and not to its netdev.

This change allows us to remove access to mlx5 priv structure, which
holds high level driver data that isn't needed for mlx5 IPsec code.
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Remove AF family obfuscation by creating symmetric structs for RX and
TX IPsec flow steering chains. This simplifies to us low level IPsec
FS creation logic without need to dig into multiple levels of structs.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Instead of performing redefinition of XFRM core defines to same
values but with MLX5_* prefix, cache the input values as is by making
sure that the proper storage objects are used.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

As a preparation for future extension of IPsec hardware object to allow
configuration of packet offload mode, extend the XFRM validator to check
replay window values.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Add needed capabilities check to determine if device supports IPsec
packet offload mode.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Add all needed bits to support IPsec packet offload mode.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

There is no need in hiding returned ASO WQE type by providing void*,
use the real type instead. Do it together with zeroing that memory,
so ASO WQE will be ready to use immediately.
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Leon Romanovsky says:

============
The following series extends XFRM core code to handle a new type of IPsec
offload - packet offload.

In this mode, the HW is going to be responsible for the whole data path,
so both policy and state should be offloaded.

IPsec packet offload is an improved version of IPsec crypto mode,
In packet mode, HW is responsible to trim/add headers in addition to
decrypt/encrypt. In this mode, the packet arrives to the stack as already
decrypted and vice versa for TX (exits to HW as not-encrypted).

Devices that implement IPsec packet offload mode offload policies too.
In the RX path, it causes the situation that HW can't effectively
handle mixed SW and HW priorities unless users make sure that HW offloaded
policies have higher priorities.

It means that we don't need to perform any search of inexact policies
and/or priority checks if HW policy was discovered. In such situation,
the HW will catch the packets anyway and HW can still implement inexact
lookups.

In case specific policy is not found, we will continue with packet lookup
and check for existence of HW policies in inexact list.

HW policies are added to the head of SPD to ensure fast lookup, as XFRM
iterates over all policies in the loop.

This simple solution allows us to achieve same benefits of separate HW/SW
policies databases without over-engineering the code to iterate and manage
two databases at the same path.

To not over-engineer the code, HW policies are treated as SW ones and
don't take into account netdev to allow reuse of the same priorities for
policies databases without over-engineering the code to iterate and manage
two databases at the same path.

To not over-engineer the code, HW policies are treated as SW ones and
don't take into account netdev to allow reuse of the same priorities for
different devices.
 * No software fallback
 * Fragments are dropped, both in RX and TX
 * No sockets policies
 * Only IPsec transport mode is implemented

================================================================================
Rekeying:

In order to support rekeying, as XFRM core is skipped, the HW/driver should
do the following:
 * Count the handled packets
 * Raise event that limits are reached
 * Drop packets once hard limit is occurred.

The XFRM core calls to newly introduced xfrm_dev_state_update_curlft()
function in order to perform sync between device statistics and internal
structures. On HW limit event, driver calls to xfrm_state_check_expire()
to allow XFRM core take relevant decisions.

This separation between control logic (in XFRM) and data plane allows us
to packet reuse SW stack.

================================================================================
Configuration:

iproute2: https://lore.kernel.org/netdev/cover.1652179360.git.leonro@nvidia.com/

Packet offload mode:
  ip xfrm state offload packet dev <if-name> dir <in|out>
  ip xfrm policy .... offload packet dev <if-name>
Crypto offload mode:
  ip xfrm state offload crypto dev <if-name> dir <in|out>
or (backward compatibility)
  ip xfrm state offload dev <if-name> dir <in|out>

================================================================================
Performance results:

TCP multi-stream, using iperf3 instance per-CPU.
+----------------------+--------+--------+--------+--------+---------+---------+
|                      | 1 CPU  | 2 CPUs | 4 CPUs | 8 CPUs | 16 CPUs | 32 CPUs |
|                      +--------+--------+--------+--------+---------+---------+
|                      |                   BW (Gbps)                           |
+----------------------+--------+--------+-------+---------+---------+---------+
| Baseline             | 27.9   | 59     | 93.1  | 92.8    | 93.7    | 94.4    |
+----------------------+--------+--------+-------+---------+---------+---------+
| Software IPsec       | 6      | 11.9   | 23.3  | 45.9    | 83.8    | 91.8    |
+----------------------+--------+--------+-------+---------+---------+---------+
| IPsec crypto offload | 15     | 29.7   | 58.5  | 89.6    | 90.4    | 90.8    |
+----------------------+--------+--------+-------+---------+---------+---------+
| IPsec packet offload | 28     | 57     | 90.7  | 91      | 91.3    | 91.9    |
+----------------------+--------+--------+-------+---------+---------+---------+

IPsec packet offload mode behaves as baseline and reaches linerate with same amount
of CPUs.

Setups details (similar for both sides):
* NIC: ConnectX6-DX dual port, 100 Gbps each.
  Single port used in the tests.
* CPU: Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz

================================================================================
Series together with mlx5 part:
https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git/log/?h=xfrm-next

================================================================================
Changelog:

v10:
 * Added forgotten xdo_dev_state_del. Patch #4.
 * Moved changelog in cover letter to the end.
 * Added "if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {" line to newly
   added netronome IPsec support. Patch #2.
v9: https://lore.kernel.org/all/cover.1669547603.git.leonro@nvidia.com
 * Added acquire support
v8: https://lore.kernel.org/all/cover.1668753030.git.leonro@nvidia.com
 * Removed not-related blank line
 * Fixed typos in documentation
v7: https://lore.kernel.org/all/cover.1667997522.git.leonro@nvidia.com
As was discussed in IPsec workshop:
 * Renamed "full offload" to be "packet offload".
 * Added check that offloaded SA and policy have same device while sending packet
 * Added to SAD same optimization as was done for SPD to speed-up lookups.
v6: https://lore.kernel.org/all/cover.1666692948.git.leonro@nvidia.com
 * Fixed misplaced "!" in sixth patch.
v5: https://lore.kernel.org/all/cover.1666525321.git.leonro@nvidia.com
 * Rebased to latest ipsec-next.
 * Replaced HW priority patch with solution which mimics separated SPDs
   for SW and HW. See more description in this cover letter.
 * Dropped RFC tag, usecase, API and implementation are clear.
v4: https://lore.kernel.org/all/cover.1662295929.git.leonro@nvidia.com
 * Changed title from "PATCH" to "PATCH RFC" per-request.
 * Added two new patches: one to update hard/soft limits and another
   initial take on documentation.
 * Added more info about lifetime/rekeying flow to cover letter, see
   relevant section.
 * perf traces for crypto mode will come later.
v3: https://lore.kernel.org/all/cover.1661260787.git.leonro@nvidia.com
 * I didn't hear any suggestion what term to use instead of
   "packet offload", so left it as is. It is used in commit messages
   and documentation only and easy to rename.
 * Added performance data and background info to cover letter
 * Reused xfrm_output_resume() function to support multiple XFRM transformations
 * Add PMTU check in addition to driver .xdo_dev_offload_ok validation
 * Documentation is in progress, but not part of this series yet.
v2: https://lore.kernel.org/all/cover.1660639789.git.leonro@nvidia.com
 * Rebased to latest 6.0-rc1
 * Add an extra check in TX datapath patch to validate packets before
   forwarding to HW.
 * Added policy cleanup logic in case of netdev down event
v1: https://lore.kernel.org/all/cover.1652851393.git.leonro@nvidia.com
 * Moved comment to be before if (...) in third patch.
v0: https://lore.kernel.org/all/cover.1652176932.git.leonro@nvidia.com
-----------------------------------------------------------------------
============
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Extend XFRM device offload API description with newly
added packet offload mode.
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Both in RX and TX, the traffic that performs IPsec packet offload
transformation is accounted by HW. It is needed to properly handle
hard limits that require to drop the packet.

It means that XFRM core needs to update internal counters with the one
that accounted by the HW, so new callbacks are introduced in this patch.

In case of soft or hard limit is occurred, the driver should call to
xfrm_state_check_expire() that will perform key rekeying exactly as
done by XFRM core.
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Devices that implement IPsec packet offload mode should offload SA and
policies too. In RX path, it causes to the situation that HW will always
have higher priority over any SW policies.

It means that we don't need to perform any search of inexact policies
and/or priority checks if HW policy was discovered. In such situation,
the HW will catch the packets anyway and HW can still implement inexact
lookups.

In case specific policy is not found, we will continue with packet lookup and
check for existence of HW policies in inexact list.

HW policies are added to the head of SPD to ensure fast lookup, as XFRM
iterates over all policies in the loop.

The same solution of adding HW SAs at the begging of the list is applied
to SA database too. However, we don't need to change lookups as they are
sorted by insertion order and not priority.
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Traffic received by device with enabled IPsec packet offload should
be forwarded to the stack only after decryption, packet headers and
trailers removed.

Such packets are expected to be seen as normal (non-XFRM) ones, while
not-supported packets should be dropped by the HW.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

In IPsec packet mode, the device is going to encrypt and encapsulate
packets that are associated with offloaded policy. After successful
policy lookup to indicate if packets should be offloaded or not,
the stack forwards packets to the device to do the magic.
Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Huy Nguyen <huyn@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Extend netlink interface to add and delete XFRM policy from the device.
This functionality is a first step to implement packet IPsec offload solution.
Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Allow users to configure xfrm states with packet offload mode.
The packet mode must be requested both for policy and state, and
such requires us to do not implement fallback.

We explicitly return an error if requested packet mode can't
be configured.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

In the next patches, the xfrm core code will be extended to support
new type of offload - packet offload. In that mode, both policy and state
should be specially configured in order to perform whole offloaded data
path.

Full offload takes care of encryption, decryption, encapsulation and
other operations with headers.

As this mode is new for XFRM policy flow, we can "start fresh" with flag
bits and release first and second bit for future use.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

In order to fix the following sleep while atomic bug always alloc pages
with GFP_ATOMIC in mtk_wed_wo_queue_refill since page_frag_alloc runs in
spin_lock critical section.

[    9.049719] Hardware name: MediaTek MT7986a RFB (DT)
[    9.054665] Call trace:
[    9.057096]  dump_backtrace+0x0/0x154
[    9.060751]  show_stack+0x14/0x1c
[    9.064052]  dump_stack_lvl+0x64/0x7c
[    9.067702]  dump_stack+0x14/0x2c
[    9.071001]  ___might_sleep+0xec/0x120
[    9.074736]  __might_sleep+0x4c/0x9c
[    9.078296]  __alloc_pages+0x184/0x2e4
[    9.082030]  page_frag_alloc_align+0x98/0x1ac
[    9.086369]  mtk_wed_wo_queue_refill+0x134/0x234
[    9.090974]  mtk_wed_wo_init+0x174/0x2c0
[    9.094881]  mtk_wed_attach+0x7c8/0x7e0
[    9.098701]  mt7915_mmio_wed_init+0x1f0/0x3a0 [mt7915e]
[    9.103940]  mt7915_pci_probe+0xec/0x3bc [mt7915e]
[    9.108727]  pci_device_probe+0xac/0x13c
[    9.112638]  really_probe.part.0+0x98/0x2f4
[    9.116807]  __driver_probe_device+0x94/0x13c
[    9.121147]  driver_probe_device+0x40/0x114
[    9.125314]  __driver_attach+0x7c/0x180
[    9.129133]  bus_for_each_dev+0x5c/0x90
[    9.132953]  driver_attach+0x20/0x2c
[    9.136513]  bus_add_driver+0x104/0x1fc
[    9.140333]  driver_register+0x74/0x120
[    9.144153]  __pci_register_driver+0x40/0x50
[    9.148407]  mt7915_init+0x5c/0x1000 [mt7915e]
[    9.152848]  do_one_initcall+0x40/0x25c
[    9.156669]  do_init_module+0x44/0x230
[    9.160403]  load_module+0x1f30/0x2750
[    9.164135]  __do_sys_init_module+0x150/0x200
[    9.168475]  __arm64_sys_init_module+0x18/0x20
[    9.172901]  invoke_syscall.constprop.0+0x4c/0xe0
[    9.177589]  do_el0_svc+0x48/0xe0
[    9.180889]  el0_svc+0x14/0x50
[    9.183929]  el0t_64_sync_handler+0x9c/0x120
[    9.188183]  el0t_64_sync+0x158/0x15c

Fixes: 79968444 ("net: ethernet: mtk_wed: introduce wed wo support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://lore.kernel.org/r/67ca94bdd3d9eaeb86e52b3050fbca0bcf7bb02f.1669908312.git.lorenzo@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

kfree_rcu(1-arg) should be avoided as much as possible,
since this is only possible from sleepable contexts,
and incurr extra rcu barriers.

I wish the 1-arg variant of kfree_rcu() would
get a distinct name, like kfree_rcu_slow()
to avoid it being abused.

Fixes: 459837b5 ("net/tcp: Disable TCP-MD5 static key on tcp_md5sig_info destruction")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20221202052847.2623997-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Merge tag 'wireless-next-2022-12-02' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next

Kalle Valo says:

====================
wireless-next patches for v6.2

Third set of patches for v6.2. mt76 has a new driver for mt7996 Wi-Fi 7
devices and iwlwifi also got initial Wi-Fi 7 support. Otherwise
smaller features and fixes.

Major changes:

ath10k
 - store WLAN firmware version in SMEM image table

mt76
 - mt7996: new driver for MediaTek Wi-Fi 7 (802.11be) devices
 - mt7986, mt7915: enable Wireless Ethernet Dispatch (WED) offload support
 - mt7915: add ack signal support
 - mt7915: enable coredump support
 - mt7921: remain_on_channel support
 - mt7921: channel context support

iwlwifi
 - enable Wi-Fi 7 Extremely High Throughput (EHT) PHY capabilities
 - 320 MHz channels support

* tag 'wireless-next-2022-12-02' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next: (144 commits)
  wifi: ath10k: fix QCOM_SMEM dependency
  wifi: mt76: mt7921e: add pci .shutdown() support
  wifi: mt76: mt7915: mmio: fix naming convention
  wifi: mt76: mt7996: add support to configure spatial reuse parameter set
  wifi: mt76: mt7996: enable ack signal support
  wifi: mt76: mt7996: enable use_cts_prot support
  wifi: mt76: mt7915: rely on band_idx of mt76_phy
  wifi: mt76: mt7915: enable per bandwidth power limit support
  wifi: mt76: mt7915: introduce mt7915_get_power_bound()
  mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init_hif2()
  wifi: mt76: do not send firmware FW_FEATURE_NON_DL region
  wifi: mt76: mt7921: Add missing __packed annotation of struct mt7921_clc
  wifi: mt76: fix coverity overrun-call in mt76_get_txpower()
  wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices
  wifi: mt76: mt76x0: remove dead code in mt76x0_phy_get_target_power
  wifi: mt76: mt7915: fix band_idx usage
  wifi: mt76: mt7915: enable .sta_set_txpwr support
  wifi: mt76: mt7915: add basedband Txpower info into debugfs
  wifi: mt76: mt7915: add support to configure spatial reuse parameter set
  wifi: mt76: mt7915: add missing MODULE_PARM_DESC
  ...
====================

Link: https://lore.kernel.org/r/20221202214254.D0D3DC433C1@smtp.kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Nathan noticed that when HWSPINLOCK is disabled there's a Kconfig warning:

  WARNING: unmet direct dependencies detected for QCOM_SMEM
    Depends on [n]: (ARCH_QCOM [=y] || COMPILE_TEST [=n]) && HWSPINLOCK [=n]
    Selected by [m]:
    - ATH10K_SNOC [=m] && NETDEVICES [=y] && WLAN [=y] && WLAN_VENDOR_ATH [=y] && ATH10K [=m] && (ARCH_QCOM [=y] || COMPILE_TEST [=n])

The problem here is that QCOM_SMEM depends on HWSPINLOCK so we cannot select
QCOM_SMEM and instead we neeed to use 'depends on'.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/all/Y4YsyaIW+CPdHWv3@dev-arch.thelio-3990X/
Fixes: 4d79f6f3 ("wifi: ath10k: Store WLAN firmware version in SMEM image table")
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221202103027.25974-1-kvalo@kernel.org

Refill RX queue in batches of descriptors to improve performance. Refill
is allowed to fail as long as a minimum number of descriptors is active.
Thus, a limited number of failed RX buffer allocations is now allowed
for normal operation. Previously every failed allocation resulted in a
dropped frame.

If the minimum number of active descriptors is reached, then RX buffers
are still reused and frames are dropped. This ensures that the RX queue
never runs empty and always continues to operate.

Prework for future XDP support.
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Without interrupt throttling, iperf server mode generates a CPU load of
100% (A53 1.2GHz). Also the throughput suffers with less than 900Mbit/s
on a 1Gbit/s link. The reason is a high interrupt load with interrupts
every ~20us.

Reduce interrupt load by throttling of interrupts. Interrupt delay
default is 64us. For iperf server mode the CPU load is significantly
reduced to ~20% and the throughput reaches the maximum of 941MBit/s.
Interrupts are generated every ~140us.

RX and TX coalesce can be configured with ethtool. RX coalesce has
priority over TX coalesce if the same interrupt is used.
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Allow user space to read number of TX and RX queue. This is useful for
device dependent qdisc configurations like TAPRIO with hardware offload.
Also ethtool::get_per_queue_coalesce / set_per_queue_coalesce requires
that interface.
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Correct xmit hash steps for layer3+4 as introduced by commit
49aefd13 ("bonding: do not discard lowest hash bit for non layer3+4
hashing").
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

With commit c1f897ce ("bonding: set default miimon value for non-arp
modes if not set") the miimon default was changed from zero to 100 if
arp_interval is also zero. Document this fact in bonding.rst.

Fixes: c1f897ce ("bonding: set default miimon value for non-arp modes if not set")
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The main usage of the struct thunderbolt_ip_frame_header is to handle
the packets on the media layer. The header is bound to the protocol
in which the byte ordering is crucial. However the data type definition
doesn't use that and sparse is unhappy, for example (17 altogether):

  .../thunderbolt.c:718:23: warning: cast to restricted __le32

  .../thunderbolt.c:966:42: warning: incorrect type in assignment (different base types)
  .../thunderbolt.c:966:42:    expected unsigned int [usertype] frame_count
  .../thunderbolt.c:966:42:    got restricted __le32 [usertype]

Switch to the bitwise types in the struct thunderbolt_ip_frame_header to
reduce this, but not completely solving (9 left), because the same data
type is used for Rx header handled locally (in CPU byte order).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less heavier for builds
than the use of __maybe_unused attributes.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Some devlink instances may contain thousands of ports. Storing them in
linked list and looking them up is not scalable. Convert the linked list
into xarray.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Sebastian Andrzej Siewior says:

====================
I started playing with HSR and run into a problem. Tested latest
upstream -rc and noticed more problems. Now it appears to work.
For testing I have a small three node setup with iperf and ping. While
iperf doesn't complain ping reports missing packets and duplicates.
====================

Link: https://lore.kernel.org/r/20221129164815.128922-1-bigeasy@linutronix.de/Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This test adds a basic HSRv0 network with 3 nodes. In its current shape
it sends and forwards packets, announcements and so merges nodes based
on MAC A/B information.
It is able to detect duplicate packets and packetloss should any occur.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

self_node_db is a list_head with one entry of struct hsr_node. The
purpose is to hold the two MAC addresses of the node itself.
It is convenient to recycle the structure. However having a list_head
and fetching always the first entry is not really optimal.

Created a new data strucure contaning the two MAC addresses named
hsr_self_node. Access that structure like an RCU protected pointer so
it can be replaced on the fly without blocking the reader.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

hsr_register_frame_out() compares new sequence_nr vs the old one
recorded in hsr_node::seq_out and if the new sequence_nr is higher then
it will be written to hsr_node::seq_out as the new value.

This operation isn't locked so it is possible that two frames with the
same sequence number arrive (via the two slave devices) and are fed to
hsr_register_frame_out() at the same time. Both will pass the check and
update the sequence counter later to the same value. As a result the
content of the same packet is fed into the stack twice.

This was noticed by running ping and observing DUP being reported from
time to time.

Instead of using the hsr_priv::seqnr_lock for the whole receive path (as
it is for sending in the master node) add an additional lock that is only
used for sequence number checks and updates.

Add a per-node lock that is used during sequence number reads and
updates.

Fixes: f421436a ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Sending frames via the hsr (master) device requires a sequence number
which is tracked in hsr_priv::sequence_nr and protected by
hsr_priv::seqnr_lock. Each time a new frame is sent, it will obtain a
new id and then send it via the slave devices.
Each time a packet is sent (via hsr_forward_do()) the sequence number is
checked via hsr_register_frame_out() to ensure that a frame is not
handled twice. This make sense for the receiving side to ensure that the
frame is not injected into the stack twice after it has been received
from both slave ports.

There is no locking to cover the sending path which means the following
scenario is possible:

  CPU0				CPU1
  hsr_dev_xmit(skb1)		hsr_dev_xmit(skb2)
   fill_frame_info()             fill_frame_info()
    hsr_fill_frame_info()         hsr_fill_frame_info()
     handle_std_frame()            handle_std_frame()
      skb1's sequence_nr = 1
                                    skb2's sequence_nr = 2
   hsr_forward_do()              hsr_forward_do()

                                   hsr_register_frame_out(, 2)  // okay, send)

    hsr_register_frame_out(, 1) // stop, lower seq duplicate

Both skbs (or their struct hsr_frame_info) received an unique id.
However since skb2 was sent before skb1, the higher sequence number was
recorded in hsr_register_frame_out() and the late arriving skb1 was
dropped and never sent.

This scenario has been observed in a three node HSR setup, with node1 +
node2 having ping and iperf running in parallel. From time to time ping
reported a missing packet. Based on tracing that missing ping packet did
not leave the system.

It might be possible (didn't check) to drop the sequence number check on
the sending side. But if the higher sequence number leaves on wire
before the lower does and the destination receives them in that order
and it will drop the packet with the lower sequence number and never
inject into the stack.
Therefore it seems the only way is to lock the whole path from obtaining
the sequence number and sending via dev_queue_xmit() and assuming the
packets leave on wire in the same order (and don't get reordered by the
NIC).

Cover the whole path for the master interface from obtaining the ID
until after it has been forwarded via hsr_forward_skb() to ensure the
skbs are sent to the NIC in the order of the assigned sequence numbers.

Fixes: f421436a ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

The hsr device is a software device. Its
net_device_ops::ndo_start_xmit() routine will process the packet and
then pass the resulting skb to dev_queue_xmit().
During processing, hsr acquires a lock with spin_lock_bh()
(hsr_add_node()) which needs to be promoted to the _irq() suffix in
order to avoid a potential deadlock.
Then there are the warnings in dev_queue_xmit() (due to
local_bh_disable() with disabled interrupts) left.

Instead trying to address those (there is qdisc and…) for netpoll sake,
just disable netpoll on hsr.

Disable netpoll on hsr and replace the _irqsave() locking with _bh().

Fixes: f421436a ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Due to the hashed-MAC optimisation one problem become visible:
hsr_handle_sup_frame() walks over the list of available nodes and merges
two node entries into one if based on the information in the supervision
both MAC addresses belong to one node. The list-walk happens on a RCU
protected list and delete operation happens under a lock.

If the supervision arrives on both slave interfaces at the same time
then this delete operation can occur simultaneously on two CPUs. The
result is the first-CPU deletes the from the list and the second CPUs
BUGs while attempting to dereference a poisoned list-entry. This happens
more likely with the optimisation because a new node for the mac_B entry
is created once a packet has been received and removed (merged) once the
supervision frame has been received.

Avoid removing/ cleaning up a hsr_node twice by adding a `removed' field
which is set to true after the removal and checked before the removal.

Fixes: f266a683 ("net/hsr: Better frame dispatch")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

hsr_forward_skb() a skb and keeps information in an on-stack
hsr_frame_info. hsr_get_node() assigns hsr_frame_info::node_src which is
from a RCU list. This pointer is used later in hsr_forward_do().
I don't see a reason why this pointer can't vanish midway since there is
no guarantee that hsr_forward_skb() is invoked from an RCU read section.

Use rcu_read_lock() to protect hsr_frame_info::node_src from its
assignment until it is no longer used.

Fixes: f266a683 ("net/hsr: Better frame dispatch")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

The hlist optimisation (which not only uses hlist_head instead of
list_head but also splits hsr_priv::node_db into an array of 256 slots)
does not consider the "node merge":
Upon starting the hsr network (with three nodes) a packet that is
sent from node1 to node3 will also be sent from node1 to node2 and then
forwarded to node3.
As a result node3 will receive 2 packets because it is not able
to filter out the duplicate. Each packet received will create a new
struct hsr_node with macaddress_A only set the MAC address it received
from (the two MAC addesses from node1).
At some point (early in the process) two supervision frames will be
received from node1. They will be processed by hsr_handle_sup_frame()
and one frame will leave early ("Node has already been merged") and does
nothing. The other frame will be merged as portB and have its MAC
address written to macaddress_B and the hsr_node (that was created for
it as macaddress_A) will be removed.
From now on HSR is able to identify a duplicate because both packets
sent from one node will result in the same struct hsr_node because
hsr_get_node() will find the MAC address either on macaddress_A or
macaddress_B.

Things get tricky with the optimisation: If sender's MAC address is
saved as macaddress_A then the lookup will work as usual. If the MAC
address has been merged into macaddress_B of another hsr_node then the
lookup won't work because it is likely that the data structure is in
another bucket. This results in creating a new struct hsr_node and not
recognising a possible duplicate.

A way around it would be to add another hsr_node::mac_list_B and attach
it to the other bucket to ensure that this hsr_node will be looked up
either via macaddress_A _or_ macaddress_B.

I however prefer to revert it because it sounds like an academic problem
rather than real life workload plus it adds complexity. I'm not an HSR
expert with what is usual size of a network but I would guess 40 to 60
nodes. With 10.000 nodes and assuming 60us for pass-through (from node
to node) then it would take almost 600ms for a packet to almost wrap
around which sounds a lot.

Revert the hash MAC addresses optimisation.

Fixes: 4acc45db ("net: hsr: use hlist_head instead of list_head for mac addresses")
Cc: Juhee Kang <claudiajkang@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>