On link state change, the controller gets reset,
causing PPS to drop out and the PHC to lose its
time and calibration. So we restart it if needed,
restoring calibration and time registers.

Changes since v2:
* Add `fec_ptp_save_state()`/`fec_ptp_restore_state()`
* Use `ktime_get_real_ns()`
* Use `BIT()` macro
Changes since v1:
* More ECR #define's
* Stop PPS in `fec_ptp_stop()`
Signed-off-by: Csókás Bence <csokas.bence@prolan.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>

It is not allowed to call kfree_skb() from hardware interrupt
context or with interrupts being disabled. So add all skb to
a tmp list, then free them after spin_unlock_irqrestore() at
once.

Fixes: 66ba215c ("neigh: fix possible DoS due to net iface start/stop loop")
Suggested-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Saeed Mahameed says:

====================
mlx5 fixes 2022-08-22

This series provides bug fixes to mlx5 driver.

* tag 'mlx5-fixes-2022-08-22' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux:
  net/mlx5: Unlock on error in mlx5_sriov_enable()
  net/mlx5e: Fix use after free in mlx5e_fs_init()
  net/mlx5e: kTLS, Use _safe() iterator in mlx5e_tls_priv_tx_list_cleanup()
  net/mlx5: unlock on error path in esw_vfs_changed_event_handler()
  net/mlx5e: Fix wrong tc flag used when set hw-tc-offload off
  net/mlx5e: TC, Add missing policer validation
  net/mlx5e: Fix wrong application of the LRO state
  net/mlx5: Avoid false positive lockdep warning by adding lock_class_key
  net/mlx5: Fix cmd error logging for manage pages cmd
  net/mlx5: Disable irq when locking lag_lock
  net/mlx5: Eswitch, Fix forwarding decision to uplink
  net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY
  net/mlx5e: Properly disable vlan strip on non-UL reps
====================

Link: https://lore.kernel.org/r/20220822195917.216025-1-saeed@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Tony Nguyen says:

====================
ice: xsk: reduced queue count fixes

Maciej Fijalkowski says:

this small series is supposed to fix the issues around AF_XDP usage with
reduced queue count on interface. Due to the XDP rings setup, some
configurations can result in sockets not seeing traffic flowing. More
about this in description of patch 2.

* '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue:
  ice: xsk: use Rx ring's XDP ring when picking NAPI context
  ice: xsk: prohibit usage of non-balanced queue id
====================

Link: https://lore.kernel.org/r/20220822163257.2382487-1-anthony.l.nguyen@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Michael Chan says:

====================
bnxt_en: Bug fixes

This series includes 2 fixes for regressions introduced by the XDP
multi-buffer feature, 1 devlink reload bug fix, and 1 SRIOV resource
accounting bug fix.
====================

Link: https://lore.kernel.org/r/1661180814-19350-1-git-send-email-michael.chan@broadcom.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

LRO/GRO_HW should be disabled if there is an attached XDP program.
BNXT_FLAG_TPA is the current setting of the LRO/GRO_HW.  Using
BNXT_FLAG_TPA to disable LRO/GRO_HW will cause these features to be
permanently disabled once they are disabled.

Fixes: 1dc4c557 ("bnxt: adding bnxt_xdp_build_skb to build skb from multibuffer xdp_buff")
Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

There are 2 issues:

1. We should decrement hw_resc->max_nqs instead of hw_resc->max_irqs
   with the number of NQs assigned to the VFs.  The IRQs are fixed
   on each function and cannot be re-assigned.  Only the NQs are being
   assigned to the VFs.

2. vf_msix is the total number of NQs to be assigned to the VFs.  So
   we should decrement vf_msix from hw_resc->max_nqs.

Fixes: b16b6891 ("bnxt_en: Add SR-IOV support for 57500 chips.")
Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Add missing devlink_set_features() API for callbacks reload_down
and reload_up to function.

Fixes: 228ea8c1 ("bnxt_en: implement devlink dev reload driver_reinit")
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Using BNXT_PAGE_MODE_BUF_SIZE + offset as buffer length value is not
sufficient when running single buffer XDP programs doing redirect
operations. The stack will complain on missing skb tail room. Fix it
by using PAGE_SIZE when calling xdp_init_buff() for single buffer
programs.

Fixes: b231c3f3 ("bnxt: refactor bnxt_rx_xdp to separate xdp_init_buff/xdp_prepare_buff")
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Address learning should initially be turned off by the driver for port
operation in standalone mode, then the DSA core handles changes to it
via ds->ops->port_bridge_flags().

Leaving address learning enabled while ports are standalone breaks any
kind of communication which involves port B receiving what port A has
sent. Notably it breaks the ksz9477 driver used with a (non offloaded,
ports act as if standalone) bonding interface in active-backup mode,
when the ports are connected together through external switches, for
redundancy purposes.

This fixes a major design flaw in the ksz9477 and ksz8795 drivers, which
unconditionally leave address learning enabled even while ports operate
as standalone.

Fixes: b987e98e ("dsa: add DSA switch driver for Microchip KSZ9477")
Link: https://lore.kernel.org/netdev/CAFZh4h-JVWt80CrQWkFji7tZJahMfOToUJQgKS5s0_=9zzpvYQ@mail.gmail.com/Reported-by: Brian Hutchinson <b.hutchman@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220818164809.3198039-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

When a driver returns -EOPNOTSUPP in dsa_port_bridge_join() but failed
to provide a reason for it, DSA attempts to set the extack to say that
software fallback will kick in.

The problem is, when we use brctl and the legacy bridge ioctls, the
extack will be NULL, and DSA dereferences it in the process of setting
it.

Sergei Antonov proves this using the following stack trace:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
PC is at dsa_slave_changeupper+0x5c/0x158

 dsa_slave_changeupper from raw_notifier_call_chain+0x38/0x6c
 raw_notifier_call_chain from __netdev_upper_dev_link+0x198/0x3b4
 __netdev_upper_dev_link from netdev_master_upper_dev_link+0x50/0x78
 netdev_master_upper_dev_link from br_add_if+0x430/0x7f4
 br_add_if from br_ioctl_stub+0x170/0x530
 br_ioctl_stub from br_ioctl_call+0x54/0x7c
 br_ioctl_call from dev_ifsioc+0x4e0/0x6bc
 dev_ifsioc from dev_ioctl+0x2f8/0x758
 dev_ioctl from sock_ioctl+0x5f0/0x674
 sock_ioctl from sys_ioctl+0x518/0xe40
 sys_ioctl from ret_fast_syscall+0x0/0x1c

Fix the problem by only overriding the extack if non-NULL.

Fixes: 1c6e8088 ("net: dsa: allow port_bridge_join() to override extack message")
Link: https://lore.kernel.org/netdev/CABikg9wx7vB5eRDAYtvAm7fprJ09Ta27a4ZazC=NX5K4wn6pWA@mail.gmail.com/Reported-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Sergei Antonov <saproj@gmail.com>
Link: https://lore.kernel.org/r/20220819173925.3581871-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Looks to have been left out in an oversight.

Cc: Mahesh Bandewar <maheshb@google.com>
Cc: Sainath Grandhi <sainath.grandhi@intel.com>
Fixes: 235a9d89 ('ipvtap: IP-VLAN based tap driver')
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Link: https://lore.kernel.org/r/20220821130808.12143-1-zenczykowski@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Jonathan Toppins says:

====================
bonding: 802.3ad: fix no transmission of LACPDUs

Configuring a bond in a specific order can leave the bond in a state
where it never transmits LACPDUs.

The first patch adds some kselftest infrastructure and the reproducer
that demonstrates the problem. The second patch fixes the issue. The
new third patch makes ad_ticks_per_sec a static const and removes the
passing of this variable via the stack.
====================

Link: https://lore.kernel.org/r/cover.1660919940.git.jtoppins@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The value is only ever set once in bond_3ad_initialize and only ever
read otherwise. There seems to be no reason to set the variable via
bond_3ad_initialize when setting the global variable will do. Change
ad_ticks_per_sec to a const to enforce its read-only usage.
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This is caused by the global variable ad_ticks_per_sec being zero as
demonstrated by the reproducer script discussed below. This causes
all timer values in __ad_timer_to_ticks to be zero, resulting
in the periodic timer to never fire.

To reproduce:
Run the script in
`tools/testing/selftests/drivers/net/bonding/bond-break-lacpdu-tx.sh` which
puts bonding into a state where it never transmits LACPDUs.

line 44: ip link add fbond type bond mode 4 miimon 200 \
            xmit_hash_policy 1 ad_actor_sys_prio 65535 lacp_rate fast
setting bond param: ad_actor_sys_prio
given:
    params.ad_actor_system = 0
call stack:
    bond_option_ad_actor_sys_prio()
    -> bond_3ad_update_ad_actor_settings()
       -> set ad.system.sys_priority = bond->params.ad_actor_sys_prio
       -> ad.system.sys_mac_addr = bond->dev->dev_addr; because
            params.ad_actor_system == 0
results:
     ad.system.sys_mac_addr = bond->dev->dev_addr

line 48: ip link set fbond address 52:54:00:3B:7C:A6
setting bond MAC addr
call stack:
    bond->dev->dev_addr = new_mac

line 52: ip link set fbond type bond ad_actor_sys_prio 65535
setting bond param: ad_actor_sys_prio
given:
    params.ad_actor_system = 0
call stack:
    bond_option_ad_actor_sys_prio()
    -> bond_3ad_update_ad_actor_settings()
       -> set ad.system.sys_priority = bond->params.ad_actor_sys_prio
       -> ad.system.sys_mac_addr = bond->dev->dev_addr; because
            params.ad_actor_system == 0
results:
     ad.system.sys_mac_addr = bond->dev->dev_addr

line 60: ip link set veth1-bond down master fbond
given:
    params.ad_actor_system = 0
    params.mode = BOND_MODE_8023AD
    ad.system.sys_mac_addr == bond->dev->dev_addr
call stack:
    bond_enslave
    -> bond_3ad_initialize(); because first slave
       -> if ad.system.sys_mac_addr != bond->dev->dev_addr
          return
results:
     Nothing is run in bond_3ad_initialize() because dev_addr equals
     sys_mac_addr leaving the global ad_ticks_per_sec zero as it is
     never initialized anywhere else.

The if check around the contents of bond_3ad_initialize() is no longer
needed due to commit 5ee14e6d ("bonding: 3ad: apply ad_actor settings
changes immediately") which sets ad.system.sys_mac_addr if any one of
the bonding parameters whos set function calls
bond_3ad_update_ad_actor_settings(). This is because if
ad.system.sys_mac_addr is zero it will be set to the current bond mac
address, this causes the if check to never be true.

Fixes: 5ee14e6d ("bonding: 3ad: apply ad_actor settings changes immediately")
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This creates a test collection in drivers/net/bonding for bonding
specific kernel selftests.

The first test is a reproducer that provisions a bond and given the
specific order in how the ip-link(8) commands are issued the bond never
transmits an LACPDU frame on any of its slaves.
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Since priv->rx_mapping[i] is maped in moxart_mac_open(), we
should unmap it from moxart_mac_stop(). Fixes 2 warnings.

1. During error unwinding in moxart_mac_probe(): "goto init_fail;",
then moxart_mac_free_memory() calls dma_unmap_single() with
priv->rx_mapping[i] pointers zeroed.

WARNING: CPU: 0 PID: 1 at kernel/dma/debug.c:963 check_unmap+0x704/0x980
DMA-API: moxart-ethernet 92000000.mac: device driver tries to free DMA memory it has not allocated [device address=0x0000000000000000] [size=1600 bytes]
CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0+ #60
Hardware name: Generic DT based system
 unwind_backtrace from show_stack+0x10/0x14
 show_stack from dump_stack_lvl+0x34/0x44
 dump_stack_lvl from __warn+0xbc/0x1f0
 __warn from warn_slowpath_fmt+0x94/0xc8
 warn_slowpath_fmt from check_unmap+0x704/0x980
 check_unmap from debug_dma_unmap_page+0x8c/0x9c
 debug_dma_unmap_page from moxart_mac_free_memory+0x3c/0xa8
 moxart_mac_free_memory from moxart_mac_probe+0x190/0x218
 moxart_mac_probe from platform_probe+0x48/0x88
 platform_probe from really_probe+0xc0/0x2e4

2. After commands:
 ip link set dev eth0 down
 ip link set dev eth0 up

WARNING: CPU: 0 PID: 55 at kernel/dma/debug.c:570 add_dma_entry+0x204/0x2ec
DMA-API: moxart-ethernet 92000000.mac: cacheline tracking EEXIST, overlapping mappings aren't supported
CPU: 0 PID: 55 Comm: ip Not tainted 5.19.0+ #57
Hardware name: Generic DT based system
 unwind_backtrace from show_stack+0x10/0x14
 show_stack from dump_stack_lvl+0x34/0x44
 dump_stack_lvl from __warn+0xbc/0x1f0
 __warn from warn_slowpath_fmt+0x94/0xc8
 warn_slowpath_fmt from add_dma_entry+0x204/0x2ec
 add_dma_entry from dma_map_page_attrs+0x110/0x328
 dma_map_page_attrs from moxart_mac_open+0x134/0x320
 moxart_mac_open from __dev_open+0x11c/0x1ec
 __dev_open from __dev_change_flags+0x194/0x22c
 __dev_change_flags from dev_change_flags+0x14/0x44
 dev_change_flags from devinet_ioctl+0x6d4/0x93c
 devinet_ioctl from inet_ioctl+0x1ac/0x25c

v1 -> v2:
Extraneous change removed.

Fixes: 6c821bd9 ("net: Add MOXA ART SoCs ethernet driver")
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220819110519.1230877-1-saproj@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

For some MAC drivers, they set the mac_managed_pm to true in its
->ndo_open() callback. So before the mac_managed_pm is set to true,
we still want to leverage the mdio_bus_phy_suspend()/resume() for
the phy device suspend and resume. In this case, the phy device is
in PHY_READY, and we shouldn't warn about this. It also seems that
the check of mac_managed_pm in WARN_ON is redundant since we already
check this in the entry of mdio_bus_phy_resume(), so drop it.

Fixes: 744d23c7 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220819082451.1992102-1-xiaolei.wang@windriver.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

In ipa_smem_init(), a Qualcomm SMEM region is allocated (if needed)
and then its virtual address is fetched using qcom_smem_get().  The
physical address associated with that region is also fetched.

The physical address is adjusted so that it is page-aligned, and an
attempt is made to update the size of the region to compensate for
any non-zero adjustment.

But that adjustment isn't done properly.  The physical address is
aligned twice, and as a result the size is never actually adjusted.

Fix this by *not* aligning the "addr" local variable, and instead
making the "phys" local variable be the adjusted "addr" value.

Fixes: a0036bb4 ("net: ipa: define SMEM memory region for IPA")
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20220818134206.567618-1-elder@linaro.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

DSA has multiple ways of specifying a MAC connection to an internal PHY.
One requires a DT description like this:

	port@0 {
		reg = <0>;
		phy-handle = <&internal_phy>;
		phy-mode = "internal";
	};

(which is IMO the recommended approach, as it is the clearest
description)

but it is also possible to leave the specification as just:

	port@0 {
		reg = <0>;
	}

and if the driver implements ds->ops->phy_read and ds->ops->phy_write,
the DSA framework "knows" it should create a ds->slave_mii_bus, and it
should connect to a non-OF-based internal PHY on this MDIO bus, at an
MDIO address equal to the port address.

There is also an intermediary way of describing things:

	port@0 {
		reg = <0>;
		phy-handle = <&internal_phy>;
	};

In case 2, DSA calls phylink_connect_phy() and in case 3, it calls
phylink_of_phy_connect(). In both cases, phylink_create() has been
called with a phy_interface_t of PHY_INTERFACE_MODE_NA, and in both
cases, PHY_INTERFACE_MODE_NA is translated into phy->interface.

It is important to note that phy_device_create() initializes
dev->interface = PHY_INTERFACE_MODE_GMII, and so, when we use
phylink_create(PHY_INTERFACE_MODE_NA), no one will override this, and we
will end up with a PHY_INTERFACE_MODE_GMII interface inherited from the
PHY.

All this means that in order to maintain compatibility with device tree
blobs where the phy-mode property is missing, we need to allow the
"gmii" phy-mode and treat it as "internal".

Fixes: 2c709e0b ("net: dsa: microchip: ksz8795: add phylink support")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216320Reported-by: Craig McQueen <craig@mcqueen.id.au>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Tested-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Link: https://lore.kernel.org/r/20220818143250.2797111-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Unlock before returning if mlx5_device_enable_sriov() fails.

Fixes: 84a433a4 ("net/mlx5: Lock mlx5 devlink reload callbacks")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Call mlx5e_fs_vlan_free(fs) before kvfree(fs).

Fixes: af8bbf73 ("net/mlx5e: Convert mlx5e_flow_steering member of mlx5e_priv to pointer")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Use the list_for_each_entry_safe() macro to prevent dereferencing "obj"
after it has been freed.

Fixes: c4dfe704 ("net/mlx5e: kTLS, Recycle objects of device-offloaded TLS TX connections")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Unlock before returning on this error path.

Fixes: f1bc646c ("net/mlx5: Use devl_ API in mlx5_esw_offloads_devlink_port_register")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

The cited commit reintroduced the ability to set hw-tc-offload
in switchdev mode by reusing NIC mode calls without modifying it
to support both modes, this can cause an illegal memory access
when trying to turn hw-tc-offload off.

Fix this by using the right TC_FLAG when checking if tc rules
are installed while disabling hw-tc-offload.

Fixes: d3cbd425 ("net/mlx5e: Add ndo_set_feature for uplink representor")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

There is a missing policer validation when offloading police action
with tc action api. Add it.

Fixes: 7d1a5ce4 ("net/mlx5e: TC, Support tc action api for police")
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Driver caches packet merge type in mlx5e_params instance which must be
in perfect sync with the netdev_feature's bit.
Prior to this patch, in certain conditions (*) LRO state was set in
mlx5e_params, while netdev_feature's bit was off. Causing the LRO to
be applied on the RQs (HW level).

(*) This can happen only on profile init (mlx5e_build_nic_params()),
when RQ expect non-linear SKB and PCI is fast enough in comparison to
link width.

Solution: remove setting of packet merge type from
mlx5e_build_nic_params() as netdev features are not updated.

Fixes: 619a8f2a ("net/mlx5e: Use linear SKB in Striding RQ")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Add a lock_class_key per mlx5 device to avoid a false positive
"possible circular locking dependency" warning by lockdep, on flows
which lock more than one mlx5 device, such as adding SF.

kernel log:
 ======================================================
 WARNING: possible circular locking dependency detected
 5.19.0-rc8+ #2 Not tainted
 ------------------------------------------------------
 kworker/u20:0/8 is trying to acquire lock:
 ffff88812dfe0d98 (&dev->intf_state_mutex){+.+.}-{3:3}, at: mlx5_init_one+0x2e/0x490 [mlx5_core]

 but task is already holding lock:
 ffff888101aa7898 (&(&notifier->n_head)->rwsem){++++}-{3:3}, at: blocking_notifier_call_chain+0x5a/0x130

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #1 (&(&notifier->n_head)->rwsem){++++}-{3:3}:
        down_write+0x90/0x150
        blocking_notifier_chain_register+0x53/0xa0
        mlx5_sf_table_init+0x369/0x4a0 [mlx5_core]
        mlx5_init_one+0x261/0x490 [mlx5_core]
        probe_one+0x430/0x680 [mlx5_core]
        local_pci_probe+0xd6/0x170
        work_for_cpu_fn+0x4e/0xa0
        process_one_work+0x7c2/0x1340
        worker_thread+0x6f6/0xec0
        kthread+0x28f/0x330
        ret_from_fork+0x1f/0x30

 -> #0 (&dev->intf_state_mutex){+.+.}-{3:3}:
        __lock_acquire+0x2fc7/0x6720
        lock_acquire+0x1c1/0x550
        __mutex_lock+0x12c/0x14b0
        mlx5_init_one+0x2e/0x490 [mlx5_core]
        mlx5_sf_dev_probe+0x29c/0x370 [mlx5_core]
        auxiliary_bus_probe+0x9d/0xe0
        really_probe+0x1e0/0xaa0
        __driver_probe_device+0x219/0x480
        driver_probe_device+0x49/0x130
        __device_attach_driver+0x1b8/0x280
        bus_for_each_drv+0x123/0x1a0
        __device_attach+0x1a3/0x460
        bus_probe_device+0x1a2/0x260
        device_add+0x9b1/0x1b40
        __auxiliary_device_add+0x88/0xc0
        mlx5_sf_dev_state_change_handler+0x67e/0x9d0 [mlx5_core]
        blocking_notifier_call_chain+0xd5/0x130
        mlx5_vhca_state_work_handler+0x2b0/0x3f0 [mlx5_core]
        process_one_work+0x7c2/0x1340
        worker_thread+0x59d/0xec0
        kthread+0x28f/0x330
        ret_from_fork+0x1f/0x30

  other info that might help us debug this:

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&(&notifier->n_head)->rwsem);
                                lock(&dev->intf_state_mutex);
                                lock(&(&notifier->n_head)->rwsem);
   lock(&dev->intf_state_mutex);

  *** DEADLOCK ***

 4 locks held by kworker/u20:0/8:
  #0: ffff888150612938 ((wq_completion)mlx5_events){+.+.}-{0:0}, at: process_one_work+0x6e2/0x1340
  #1: ffff888100cafdb8 ((work_completion)(&work->work)#3){+.+.}-{0:0}, at: process_one_work+0x70f/0x1340
  #2: ffff888101aa7898 (&(&notifier->n_head)->rwsem){++++}-{3:3}, at: blocking_notifier_call_chain+0x5a/0x130
  #3: ffff88813682d0e8 (&dev->mutex){....}-{3:3}, at:__device_attach+0x76/0x460

 stack backtrace:
 CPU: 6 PID: 8 Comm: kworker/u20:0 Not tainted 5.19.0-rc8+
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
 Workqueue: mlx5_events mlx5_vhca_state_work_handler [mlx5_core]
 Call Trace:
  <TASK>
  dump_stack_lvl+0x57/0x7d
  check_noncircular+0x278/0x300
  ? print_circular_bug+0x460/0x460
  ? lock_chain_count+0x20/0x20
  ? register_lock_class+0x1880/0x1880
  __lock_acquire+0x2fc7/0x6720
  ? register_lock_class+0x1880/0x1880
  ? register_lock_class+0x1880/0x1880
  lock_acquire+0x1c1/0x550
  ? mlx5_init_one+0x2e/0x490 [mlx5_core]
  ? lockdep_hardirqs_on_prepare+0x400/0x400
  __mutex_lock+0x12c/0x14b0
  ? mlx5_init_one+0x2e/0x490 [mlx5_core]
  ? mlx5_init_one+0x2e/0x490 [mlx5_core]
  ? _raw_read_unlock+0x1f/0x30
  ? mutex_lock_io_nested+0x1320/0x1320
  ? __ioremap_caller.constprop.0+0x306/0x490
  ? mlx5_sf_dev_probe+0x269/0x370 [mlx5_core]
  ? iounmap+0x160/0x160
  mlx5_init_one+0x2e/0x490 [mlx5_core]
  mlx5_sf_dev_probe+0x29c/0x370 [mlx5_core]
  ? mlx5_sf_dev_remove+0x130/0x130 [mlx5_core]
  auxiliary_bus_probe+0x9d/0xe0
  really_probe+0x1e0/0xaa0
  __driver_probe_device+0x219/0x480
  ? auxiliary_match_id+0xe9/0x140
  driver_probe_device+0x49/0x130
  __device_attach_driver+0x1b8/0x280
  ? driver_allows_async_probing+0x140/0x140
  bus_for_each_drv+0x123/0x1a0
  ? bus_for_each_dev+0x1a0/0x1a0
  ? lockdep_hardirqs_on_prepare+0x286/0x400
  ? trace_hardirqs_on+0x2d/0x100
  __device_attach+0x1a3/0x460
  ? device_driver_attach+0x1e0/0x1e0
  ? kobject_uevent_env+0x22d/0xf10
  bus_probe_device+0x1a2/0x260
  device_add+0x9b1/0x1b40
  ? dev_set_name+0xab/0xe0
  ? __fw_devlink_link_to_suppliers+0x260/0x260
  ? memset+0x20/0x40
  ? lockdep_init_map_type+0x21a/0x7d0
  __auxiliary_device_add+0x88/0xc0
  ? auxiliary_device_init+0x86/0xa0
  mlx5_sf_dev_state_change_handler+0x67e/0x9d0 [mlx5_core]
  blocking_notifier_call_chain+0xd5/0x130
  mlx5_vhca_state_work_handler+0x2b0/0x3f0 [mlx5_core]
  ? mlx5_vhca_event_arm+0x100/0x100 [mlx5_core]
  ? lock_downgrade+0x6e0/0x6e0
  ? lockdep_hardirqs_on_prepare+0x286/0x400
  process_one_work+0x7c2/0x1340
  ? lockdep_hardirqs_on_prepare+0x400/0x400
  ? pwq_dec_nr_in_flight+0x230/0x230
  ? rwlock_bug.part.0+0x90/0x90
  worker_thread+0x59d/0xec0
  ? process_one_work+0x1340/0x1340
  kthread+0x28f/0x330
  ? kthread_complete_and_exit+0x20/0x20
  ret_from_fork+0x1f/0x30
  </TASK>

Fixes: 6a327321 ("net/mlx5: SF, Port function state change support")
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

When the driver unloads, give/reclaim_pages may fail as PF driver in
teardown flow, current code will lead to the following kernel log print
'failed reclaiming pages: err 0'.

Fix it to get same behavior as before the cited commits,
by calling mlx5_cmd_check before handling error state.
mlx5_cmd_check will verify if the returned error is an actual error
needed to be handled by the driver or not and will return an
appropriate value.

Fixes: 8d564292 ("net/mlx5: Remove redundant error on reclaim pages")
Fixes: 4dac2f10 ("net/mlx5: Remove redundant notify fail on give pages")
Signed-off-by: Roy Novich <royno@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

The lag_lock is taken from both process and softirq contexts which results
lockdep warning[0] about potential deadlock. However, just disabling
softirqs by using *_bh spinlock API is not enough since it will cause
warning in some contexts where the lock is obtained with hard irqs
disabled. To fix the issue save current irq state, disable them before
obtaining the lock an re-enable irqs from saved state after releasing it.

[0]:

[Sun Aug  7 13:12:29 2022] ================================
[Sun Aug  7 13:12:29 2022] WARNING: inconsistent lock state
[Sun Aug  7 13:12:29 2022] 5.19.0_for_upstream_debug_2022_08_04_16_06 #1 Not tainted
[Sun Aug  7 13:12:29 2022] --------------------------------
[Sun Aug  7 13:12:29 2022] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[Sun Aug  7 13:12:29 2022] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[Sun Aug  7 13:12:29 2022] ffffffffa06dc0d8 (lag_lock){+.?.}-{2:2}, at: mlx5_lag_is_shared_fdb+0x1f/0x120 [mlx5_core]
[Sun Aug  7 13:12:29 2022] {SOFTIRQ-ON-W} state was registered at:
[Sun Aug  7 13:12:29 2022]   lock_acquire+0x1c1/0x550
[Sun Aug  7 13:12:29 2022]   _raw_spin_lock+0x2c/0x40
[Sun Aug  7 13:12:29 2022]   mlx5_lag_add_netdev+0x13b/0x480 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   mlx5e_nic_enable+0x114/0x470 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   mlx5e_attach_netdev+0x30e/0x6a0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   mlx5e_resume+0x105/0x160 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   mlx5e_probe+0xac3/0x14f0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   auxiliary_bus_probe+0x9d/0xe0
[Sun Aug  7 13:12:29 2022]   really_probe+0x1e0/0xaa0
[Sun Aug  7 13:12:29 2022]   __driver_probe_device+0x219/0x480
[Sun Aug  7 13:12:29 2022]   driver_probe_device+0x49/0x130
[Sun Aug  7 13:12:29 2022]   __driver_attach+0x1e4/0x4d0
[Sun Aug  7 13:12:29 2022]   bus_for_each_dev+0x11e/0x1a0
[Sun Aug  7 13:12:29 2022]   bus_add_driver+0x3f4/0x5a0
[Sun Aug  7 13:12:29 2022]   driver_register+0x20f/0x390
[Sun Aug  7 13:12:29 2022]   __auxiliary_driver_register+0x14e/0x260
[Sun Aug  7 13:12:29 2022]   mlx5e_init+0x38/0x90 [mlx5_core]
[Sun Aug  7 13:12:29 2022]   vhost_iotlb_itree_augment_rotate+0xcb/0x180 [vhost_iotlb]
[Sun Aug  7 13:12:29 2022]   do_one_initcall+0xc4/0x400
[Sun Aug  7 13:12:29 2022]   do_init_module+0x18a/0x620
[Sun Aug  7 13:12:29 2022]   load_module+0x563a/0x7040
[Sun Aug  7 13:12:29 2022]   __do_sys_finit_module+0x122/0x1d0
[Sun Aug  7 13:12:29 2022]   do_syscall_64+0x3d/0x90
[Sun Aug  7 13:12:29 2022]   entry_SYSCALL_64_after_hwframe+0x46/0xb0
[Sun Aug  7 13:12:29 2022] irq event stamp: 3596508
[Sun Aug  7 13:12:29 2022] hardirqs last  enabled at (3596508): [<ffffffff813687c2>] __local_bh_enable_ip+0xa2/0x100
[Sun Aug  7 13:12:29 2022] hardirqs last disabled at (3596507): [<ffffffff813687da>] __local_bh_enable_ip+0xba/0x100
[Sun Aug  7 13:12:29 2022] softirqs last  enabled at (3596488): [<ffffffff81368a2a>] irq_exit_rcu+0x11a/0x170
[Sun Aug  7 13:12:29 2022] softirqs last disabled at (3596495): [<ffffffff81368a2a>] irq_exit_rcu+0x11a/0x170
[Sun Aug  7 13:12:29 2022]
                           other info that might help us debug this:
[Sun Aug  7 13:12:29 2022]  Possible unsafe locking scenario:

[Sun Aug  7 13:12:29 2022]        CPU0
[Sun Aug  7 13:12:29 2022]        ----
[Sun Aug  7 13:12:29 2022]   lock(lag_lock);
[Sun Aug  7 13:12:29 2022]   <Interrupt>
[Sun Aug  7 13:12:29 2022]     lock(lag_lock);
[Sun Aug  7 13:12:29 2022]
                            *** DEADLOCK ***

[Sun Aug  7 13:12:29 2022] 4 locks held by swapper/0/0:
[Sun Aug  7 13:12:29 2022]  #0: ffffffff84643260 (rcu_read_lock){....}-{1:2}, at: mlx5e_napi_poll+0x43/0x20a0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  #1: ffffffff84643260 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_list_internal+0x2d7/0xd60
[Sun Aug  7 13:12:29 2022]  #2: ffff888144a18b58 (&br->hash_lock){+.-.}-{2:2}, at: br_fdb_update+0x301/0x570
[Sun Aug  7 13:12:29 2022]  #3: ffffffff84643260 (rcu_read_lock){....}-{1:2}, at: atomic_notifier_call_chain+0x5/0x1d0
[Sun Aug  7 13:12:29 2022]
                           stack backtrace:
[Sun Aug  7 13:12:29 2022] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0_for_upstream_debug_2022_08_04_16_06 #1
[Sun Aug  7 13:12:29 2022] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[Sun Aug  7 13:12:29 2022] Call Trace:
[Sun Aug  7 13:12:29 2022]  <IRQ>
[Sun Aug  7 13:12:29 2022]  dump_stack_lvl+0x57/0x7d
[Sun Aug  7 13:12:29 2022]  mark_lock.part.0.cold+0x5f/0x92
[Sun Aug  7 13:12:29 2022]  ? lock_chain_count+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? unwind_next_frame+0x1c4/0x1b50
[Sun Aug  7 13:12:29 2022]  ? secondary_startup_64_no_verify+0xcd/0xdb
[Sun Aug  7 13:12:29 2022]  ? mlx5e_napi_poll+0x4e9/0x20a0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? mlx5e_napi_poll+0x4e9/0x20a0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? stack_access_ok+0x1d0/0x1d0
[Sun Aug  7 13:12:29 2022]  ? start_kernel+0x3a7/0x3c5
[Sun Aug  7 13:12:29 2022]  __lock_acquire+0x1260/0x6720
[Sun Aug  7 13:12:29 2022]  ? lock_chain_count+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? lock_chain_count+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? register_lock_class+0x1880/0x1880
[Sun Aug  7 13:12:29 2022]  ? mark_lock.part.0+0xed/0x3060
[Sun Aug  7 13:12:29 2022]  ? stack_trace_save+0x91/0xc0
[Sun Aug  7 13:12:29 2022]  lock_acquire+0x1c1/0x550
[Sun Aug  7 13:12:29 2022]  ? mlx5_lag_is_shared_fdb+0x1f/0x120 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? lockdep_hardirqs_on_prepare+0x400/0x400
[Sun Aug  7 13:12:29 2022]  ? __lock_acquire+0xd6f/0x6720
[Sun Aug  7 13:12:29 2022]  _raw_spin_lock+0x2c/0x40
[Sun Aug  7 13:12:29 2022]  ? mlx5_lag_is_shared_fdb+0x1f/0x120 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  mlx5_lag_is_shared_fdb+0x1f/0x120 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  mlx5_esw_bridge_rep_vport_num_vhca_id_get+0x1a0/0x600 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? mlx5_esw_bridge_update_work+0x90/0x90 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? lock_acquire+0x1c1/0x550
[Sun Aug  7 13:12:29 2022]  mlx5_esw_bridge_switchdev_event+0x185/0x8f0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? mlx5_esw_bridge_port_obj_attr_set+0x3e0/0x3e0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? check_chain_key+0x24a/0x580
[Sun Aug  7 13:12:29 2022]  atomic_notifier_call_chain+0xd7/0x1d0
[Sun Aug  7 13:12:29 2022]  br_switchdev_fdb_notify+0xea/0x100
[Sun Aug  7 13:12:29 2022]  ? br_switchdev_set_port_flag+0x310/0x310
[Sun Aug  7 13:12:29 2022]  fdb_notify+0x11b/0x150
[Sun Aug  7 13:12:29 2022]  br_fdb_update+0x34c/0x570
[Sun Aug  7 13:12:29 2022]  ? lock_chain_count+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? br_fdb_add_local+0x50/0x50
[Sun Aug  7 13:12:29 2022]  ? br_allowed_ingress+0x5f/0x1070
[Sun Aug  7 13:12:29 2022]  ? check_chain_key+0x24a/0x580
[Sun Aug  7 13:12:29 2022]  br_handle_frame_finish+0x786/0x18e0
[Sun Aug  7 13:12:29 2022]  ? check_chain_key+0x24a/0x580
[Sun Aug  7 13:12:29 2022]  ? br_handle_local_finish+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? __lock_acquire+0xd6f/0x6720
[Sun Aug  7 13:12:29 2022]  ? sctp_inet_bind_verify+0x4d/0x190
[Sun Aug  7 13:12:29 2022]  ? xlog_unpack_data+0x2e0/0x310
[Sun Aug  7 13:12:29 2022]  ? br_handle_local_finish+0x20/0x20
[Sun Aug  7 13:12:29 2022]  br_nf_hook_thresh+0x227/0x380 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? setup_pre_routing+0x460/0x460 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? br_handle_local_finish+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? br_nf_pre_routing_ipv6+0x48b/0x69c [br_netfilter]
[Sun Aug  7 13:12:29 2022]  br_nf_pre_routing_finish_ipv6+0x5c2/0xbf0 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? br_handle_local_finish+0x20/0x20
[Sun Aug  7 13:12:29 2022]  br_nf_pre_routing_ipv6+0x4c6/0x69c [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? br_validate_ipv6+0x9e0/0x9e0 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? br_nf_forward_arp+0xb70/0xb70 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  ? br_nf_pre_routing+0xacf/0x1160 [br_netfilter]
[Sun Aug  7 13:12:29 2022]  br_handle_frame+0x8a9/0x1270
[Sun Aug  7 13:12:29 2022]  ? br_handle_frame_finish+0x18e0/0x18e0
[Sun Aug  7 13:12:29 2022]  ? register_lock_class+0x1880/0x1880
[Sun Aug  7 13:12:29 2022]  ? br_handle_local_finish+0x20/0x20
[Sun Aug  7 13:12:29 2022]  ? bond_handle_frame+0xf9/0xac0 [bonding]
[Sun Aug  7 13:12:29 2022]  ? br_handle_frame_finish+0x18e0/0x18e0
[Sun Aug  7 13:12:29 2022]  __netif_receive_skb_core+0x7c0/0x2c70
[Sun Aug  7 13:12:29 2022]  ? check_chain_key+0x24a/0x580
[Sun Aug  7 13:12:29 2022]  ? generic_xdp_tx+0x5b0/0x5b0
[Sun Aug  7 13:12:29 2022]  ? __lock_acquire+0xd6f/0x6720
[Sun Aug  7 13:12:29 2022]  ? register_lock_class+0x1880/0x1880
[Sun Aug  7 13:12:29 2022]  ? check_chain_key+0x24a/0x580
[Sun Aug  7 13:12:29 2022]  __netif_receive_skb_list_core+0x2d7/0x8a0
[Sun Aug  7 13:12:29 2022]  ? lock_acquire+0x1c1/0x550
[Sun Aug  7 13:12:29 2022]  ? process_backlog+0x960/0x960
[Sun Aug  7 13:12:29 2022]  ? lockdep_hardirqs_on_prepare+0x129/0x400
[Sun Aug  7 13:12:29 2022]  ? kvm_clock_get_cycles+0x14/0x20
[Sun Aug  7 13:12:29 2022]  netif_receive_skb_list_internal+0x5f4/0xd60
[Sun Aug  7 13:12:29 2022]  ? do_xdp_generic+0x150/0x150
[Sun Aug  7 13:12:29 2022]  ? mlx5e_poll_rx_cq+0xf6b/0x2960 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? mlx5e_poll_ico_cq+0x3d/0x1590 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  napi_complete_done+0x188/0x710
[Sun Aug  7 13:12:29 2022]  mlx5e_napi_poll+0x4e9/0x20a0 [mlx5_core]
[Sun Aug  7 13:12:29 2022]  ? __queue_work+0x53c/0xeb0
[Sun Aug  7 13:12:29 2022]  __napi_poll+0x9f/0x540
[Sun Aug  7 13:12:29 2022]  net_rx_action+0x420/0xb70
[Sun Aug  7 13:12:29 2022]  ? napi_threaded_poll+0x470/0x470
[Sun Aug  7 13:12:29 2022]  ? __common_interrupt+0x79/0x1a0
[Sun Aug  7 13:12:29 2022]  __do_softirq+0x271/0x92c
[Sun Aug  7 13:12:29 2022]  irq_exit_rcu+0x11a/0x170
[Sun Aug  7 13:12:29 2022]  common_interrupt+0x7d/0xa0
[Sun Aug  7 13:12:29 2022]  </IRQ>
[Sun Aug  7 13:12:29 2022]  <TASK>
[Sun Aug  7 13:12:29 2022]  asm_common_interrupt+0x22/0x40
[Sun Aug  7 13:12:29 2022] RIP: 0010:default_idle+0x42/0x60
[Sun Aug  7 13:12:29 2022] Code: c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 04 84 d2 75 14 8b 05 6b f1 22 02 85 c0 7e 07 0f 00 2d 80 3b 4a 00 fb f4 <c3> 48 c7 c7 e0 07 7e 85 e8 21 bd 40 fe eb de 66 66 2e 0f 1f 84 00
[Sun Aug  7 13:12:29 2022] RSP: 0018:ffffffff84407e18 EFLAGS: 00000242
[Sun Aug  7 13:12:29 2022] RAX: 0000000000000001 RBX: ffffffff84ec4a68 RCX: 1ffffffff0afc0fc
[Sun Aug  7 13:12:29 2022] RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff835b1fac
[Sun Aug  7 13:12:29 2022] RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8884d2c44ac3
[Sun Aug  7 13:12:29 2022] R10: ffffed109a588958 R11: 00000000ffffffff R12: 0000000000000000
[Sun Aug  7 13:12:29 2022] R13: ffffffff84efac20 R14: 0000000000000000 R15: dffffc0000000000
[Sun Aug  7 13:12:29 2022]  ? default_idle_call+0xcc/0x460
[Sun Aug  7 13:12:29 2022]  default_idle_call+0xec/0x460
[Sun Aug  7 13:12:29 2022]  do_idle+0x394/0x450
[Sun Aug  7 13:12:29 2022]  ? arch_cpu_idle_exit+0x40/0x40
[Sun Aug  7 13:12:29 2022]  cpu_startup_entry+0x19/0x20
[Sun Aug  7 13:12:29 2022]  rest_init+0x156/0x250
[Sun Aug  7 13:12:29 2022]  arch_call_rest_init+0xf/0x15
[Sun Aug  7 13:12:29 2022]  start_kernel+0x3a7/0x3c5
[Sun Aug  7 13:12:29 2022]  secondary_startup_64_no_verify+0xcd/0xdb
[Sun Aug  7 13:12:29 2022]  </TASK>

Fixes: ff9b7521 ("net/mlx5: Bridge, support LAG")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Make sure to modify the rule for uplink forwarding only for the case
where destination vport number is MLX5_VPORT_UPLINK.

Fixes: 94db3317 ("net/mlx5: Support multiport eswitch mode")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Only set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered.
Doing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and
ldev->pf[MLX5_LAG_P1].dev have valid pointers when
MLX5_LAG_FLAG_NDEVS_READY is set.

The core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and
clearing it. Setting it is done wrongly when both
ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set;
clearing it is done right when either of ldev->pf[i].netdev is cleared.

Consider the following scenario:
1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer
2. PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and
   ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in
   MLX5_LAG_FLAG_NDEVS_READY is set.
3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev.
   MLX5_LAG_FLAG_NDEVS_READY remains set.

Further execution of mlx5_do_bond() will result in null pointer
dereference when calling mlx5_lag_is_multipath()

This patch fixes the following call trace actually encountered:

[ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8
[ 1293.478756] #PF: supervisor read access in kernel mode
[ 1293.481320] #PF: error_code(0x0000) - not-present page
[ 1293.483686] PGD 0 P4D 0
[ 1293.484434] Oops: 0000 [#1] SMP PTI
[ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 Not tainted 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1
[ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]
[ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core]
[ 1293.494044] Code: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 <48> 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8
[ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202
[ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000
[ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000
[ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c
[ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0
[ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858
[ 1293.508753] FS:  0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000
[ 1293.510782] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0
[ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Fixes: 8a66e458 ("net/mlx5: Change ownership model for lag")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

When querying mlx5 non-uplink representors capabilities with ethtool
rx-vlan-offload is marked as "off [fixed]". However, it is actually always
enabled because mlx5e_params->vlan_strip_disable is 0 by default when
initializing struct mlx5e_params instance. Fix the issue by explicitly
setting the vlan_strip_disable to 'true' for non-uplink representors.

Fixes: cb67b832 ("net/mlx5e: Introduce SRIOV VF representors")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Ice driver allocates per cpu XDP queues so that redirect path can safely
use smp_processor_id() as an index to the array. At the same time
though, XDP rings are used to pick NAPI context to call napi_schedule()
or set NAPIF_STATE_MISSED. When user reduces queue count, say to 8, and
num_possible_cpus() of underlying platform is 44, then this means queue
vectors with correlated NAPI contexts will carry several XDP queues.

This in turn can result in a broken behavior where NAPI context of
interest will never be scheduled and AF_XDP socket will not process any
traffic.

To fix this, let us change the way how XDP rings are assigned to Rx
rings and use this information later on when setting
ice_tx_ring::xsk_pool pointer. For each Rx ring, grab the associated
queue vector and walk through Tx ring's linked list. Once we stumble
upon XDP ring in it, assign this ring to ice_rx_ring::xdp_ring.

Previous [0] approach of fixing this issue was for txonly scenario
because of the described grouping of XDP rings across queue vectors. So,
relying on Rx ring meant that NAPI context could be scheduled with a
queue vector without XDP ring with associated XSK pool.

[0]: https://lore.kernel.org/netdev/20220707161128.54215-1-maciej.fijalkowski@intel.com/

Fixes: 2d4238f5 ("ice: Add support for AF_XDP")
Fixes: 22bf877e ("ice: introduce XDP_TX fallback path")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Fix the following scenario:
1. ethtool -L $IFACE rx 8 tx 96
2. xdpsock -q 10 -t -z

Above refers to a case where user would like to attach XSK socket in
txonly mode at a queue id that does not have a corresponding Rx queue.
At this moment ice's XSK logic is tightly bound to act on a "queue pair",
e.g. both Tx and Rx queues at a given queue id are disabled/enabled and
both of them will get XSK pool assigned, which is broken for the presented
queue configuration. This results in the splat included at the bottom,
which is basically an OOB access to Rx ring array.

To fix this, allow using the ids only in scope of "combined" queues
reported by ethtool. However, logic should be rewritten to allow such
configurations later on, which would end up as a complete rewrite of the
control path, so let us go with this temporary fix.

[420160.558008] BUG: kernel NULL pointer dereference, address: 0000000000000082
[420160.566359] #PF: supervisor read access in kernel mode
[420160.572657] #PF: error_code(0x0000) - not-present page
[420160.579002] PGD 0 P4D 0
[420160.582756] Oops: 0000 [#1] PREEMPT SMP NOPTI
[420160.588396] CPU: 10 PID: 21232 Comm: xdpsock Tainted: G           OE     5.19.0-rc7+ #10
[420160.597893] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
[420160.609894] RIP: 0010:ice_xsk_pool_setup+0x44/0x7d0 [ice]
[420160.616968] Code: f3 48 83 ec 40 48 8b 4f 20 48 8b 3f 65 48 8b 04 25 28 00 00 00 48 89 44 24 38 31 c0 48 8d 04 ed 00 00 00 00 48 01 c1 48 8b 11 <0f> b7 92 82 00 00 00 48 85 d2 0f 84 2d 75 00 00 48 8d 72 ff 48 85
[420160.639421] RSP: 0018:ffffc9002d2afd48 EFLAGS: 00010282
[420160.646650] RAX: 0000000000000050 RBX: ffff88811d8bdd00 RCX: ffff888112c14ff8
[420160.655893] RDX: 0000000000000000 RSI: ffff88811d8bdd00 RDI: ffff888109861000
[420160.665166] RBP: 000000000000000a R08: 000000000000000a R09: 0000000000000000
[420160.674493] R10: 000000000000889f R11: 0000000000000000 R12: 000000000000000a
[420160.683833] R13: 000000000000000a R14: 0000000000000000 R15: ffff888117611828
[420160.693211] FS:  00007fa869fc1f80(0000) GS:ffff8897e0880000(0000) knlGS:0000000000000000
[420160.703645] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[420160.711783] CR2: 0000000000000082 CR3: 00000001d076c001 CR4: 00000000007706e0
[420160.721399] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[420160.731045] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[420160.740707] PKRU: 55555554
[420160.745960] Call Trace:
[420160.750962]  <TASK>
[420160.755597]  ? kmalloc_large_node+0x79/0x90
[420160.762703]  ? __kmalloc_node+0x3f5/0x4b0
[420160.769341]  xp_assign_dev+0xfd/0x210
[420160.775661]  ? shmem_file_read_iter+0x29a/0x420
[420160.782896]  xsk_bind+0x152/0x490
[420160.788943]  __sys_bind+0xd0/0x100
[420160.795097]  ? exit_to_user_mode_prepare+0x20/0x120
[420160.802801]  __x64_sys_bind+0x16/0x20
[420160.809298]  do_syscall_64+0x38/0x90
[420160.815741]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[420160.823731] RIP: 0033:0x7fa86a0dd2fb
[420160.830264] Code: c3 66 0f 1f 44 00 00 48 8b 15 69 8b 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb bc 0f 1f 44 00 00 f3 0f 1e fa b8 31 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 3d 8b 0c 00 f7 d8 64 89 01 48
[420160.855410] RSP: 002b:00007ffc1146f618 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
[420160.866366] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa86a0dd2fb
[420160.876957] RDX: 0000000000000010 RSI: 00007ffc1146f680 RDI: 0000000000000003
[420160.887604] RBP: 000055d7113a0520 R08: 00007fa868fb8000 R09: 0000000080000000
[420160.898293] R10: 0000000000008001 R11: 0000000000000246 R12: 000055d7113a04e0
[420160.909038] R13: 000055d7113a0320 R14: 000000000000000a R15: 0000000000000000
[420160.919817]  </TASK>
[420160.925659] Modules linked in: ice(OE) af_packet binfmt_misc nls_iso8859_1 ipmi_ssif intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp mei_me coretemp ioatdma mei ipmi_si wmi ipmi_msghandler acpi_pad acpi_power_meter ip_tables x_tables autofs4 ixgbe i40e crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd ahci mdio dca libahci lpc_ich [last unloaded: ice]
[420160.977576] CR2: 0000000000000082
[420160.985037] ---[ end trace 0000000000000000 ]---
[420161.097724] RIP: 0010:ice_xsk_pool_setup+0x44/0x7d0 [ice]
[420161.107341] Code: f3 48 83 ec 40 48 8b 4f 20 48 8b 3f 65 48 8b 04 25 28 00 00 00 48 89 44 24 38 31 c0 48 8d 04 ed 00 00 00 00 48 01 c1 48 8b 11 <0f> b7 92 82 00 00 00 48 85 d2 0f 84 2d 75 00 00 48 8d 72 ff 48 85
[420161.134741] RSP: 0018:ffffc9002d2afd48 EFLAGS: 00010282
[420161.144274] RAX: 0000000000000050 RBX: ffff88811d8bdd00 RCX: ffff888112c14ff8
[420161.155690] RDX: 0000000000000000 RSI: ffff88811d8bdd00 RDI: ffff888109861000
[420161.168088] RBP: 000000000000000a R08: 000000000000000a R09: 0000000000000000
[420161.179295] R10: 000000000000889f R11: 0000000000000000 R12: 000000000000000a
[420161.190420] R13: 000000000000000a R14: 0000000000000000 R15: ffff888117611828
[420161.201505] FS:  00007fa869fc1f80(0000) GS:ffff8897e0880000(0000) knlGS:0000000000000000
[420161.213628] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[420161.223413] CR2: 0000000000000082 CR3: 00000001d076c001 CR4: 00000000007706e0
[420161.234653] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[420161.245893] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[420161.257052] PKRU: 55555554

Fixes: 2d4238f5 ("ice: Add support for AF_XDP")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

When the pn532 uart device is detaching, the pn532_uart_remove()
is called. But there are no functions in pn532_uart_remove() that
could delete the cmd_timeout timer, which will cause use-after-free
bugs. The process is shown below:

    (thread 1)                  |        (thread 2)
                                |  pn532_uart_send_frame
pn532_uart_remove               |    mod_timer(&pn532->cmd_timeout,...)
  ...                           |    (wait a time)
  kfree(pn532) //FREE           |    pn532_cmd_timeout
                                |      pn532_uart_send_frame
                                |        pn532->... //USE

This patch adds del_timer_sync() in pn532_uart_remove() in order to
prevent the use-after-free bugs. What's more, the pn53x_unregister_nfc()
is well synchronized, it sets nfc_dev->shutting_down to true and there
are no syscalls could restart the cmd_timeout timer.

Fixes: c656aa4c ("nfc: pn533: add UART phy driver")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

Hayes Wang says:

====================
r8152: fix flow control settings

These patches fix the settings of RX FIFO about flow control.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The RX FIFO would be changed when suspending, so the related settings
have to be modified, too. Otherwise, the flow control would work
abnormally.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=216333Reported-by: Mark Blakeney <mark.blakeney@bullet-systems.net>
Fixes: cdf0b86b ("r8152: fix a WOL issue")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The units of PLA_RX_FIFO_FULL and PLA_RX_FIFO_EMPTY are 16 bytes.

Fixes: 195aae32 ("r8152: support new chips")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 3b3fd068 added NULL check for
`rose_loopback_neigh->dev` in rose_loopback_timer() but omitted to
check rose_loopback_neigh->loopback.

It thus prevents *all* rose connect.

The reason is that a special rose_neigh loopback has a NULL device.

/proc/net/rose_neigh illustrates it via rose_neigh_show() function :
[...]
seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
	   rose_neigh->number,
	   (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
	   rose_neigh->dev ? rose_neigh->dev->name : "???",
	   rose_neigh->count,

/proc/net/rose_neigh displays special rose_loopback_neigh->loopback as
callsign RSLOOP-0:

addr  callsign  dev  count use mode restart  t0  tf digipeaters
00001 RSLOOP-0  ???      1   2  DCE     yes   0   0

By checking rose_loopback_neigh->loopback, rose_rx_call_request() is called
even in case rose_loopback_neigh->dev is NULL. This repairs rose connections.

Verification with rose client application FPAC:

FPAC-Node v 4.1.3 (built Aug  5 2022) for LINUX (help = h)
F6BVP-4 (Commands = ?) : u
Users - AX.25 Level 2 sessions :
Port   Callsign     Callsign  AX.25 state  ROSE state  NetRom status
axudp  F6BVP-5   -> F6BVP-9   Connected    Connected   ---------

Fixes: 3b3fd068 ("rose: Fix Null pointer dereference in rose_send_frame()")
Signed-off-by: Bernard Pidoux <f6bvp@free.fr>
Suggested-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Thomas DL9SAU Osterried <thomas@osterried.de>
Signed-off-by: David S. Miller <davem@davemloft.net>