The function i40e_validate_cloud_filter checks that the destination and
source port numbers are valid by attempting to ensure that the number is
non-zero and no larger than 0xFFFF. However, the types for the dst_port
and src_port variable are __be16 which by definition cannot be larger
than 0xFFFF

Since these values cannot be larger than 2 bytes, the check to see if
they exceed 0xFFFF is meaningless.

One might consider these checks as some sort of defensive coding, in
case the type was later changed. However, these checks also byte-swap
the value before comparison using be16_to_cpu, which will truncate the
values to 16bits anyways. Additionally, changing the type would require
updating the opcodes to support new data layout of these virtchnl
commands.

Remove the check to silence the -Wtype-limits warning that was added to
GCC 8.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

This code implements driver code changes necessary for LLDP
Agent support. Modified i40e_aq_start_lldp() and
i40e_aq_stop_lldp() adding false parameter whether LLDP state
should be persistent across power cycles.
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Add assignments for advertising 40GBase_LR4, 40GBase_CR4 and fibre
Signed-off-by: Adam Ludkiewicz <adam.ludkiewicz@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Due to changes in FW the SW is required to perform double SR dump in
some cases.

Implementation adds two new steps to update nvm checksum function:
* recalculate checksum and check if checksum in NVM is correct
* if checksum in NVM is not correct then update it again
Signed-off-by: Maciej Paczkowski <maciej.paczkowski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

VF's attempt to delete vlan 0 when a port vlan is configured is harmless
in this case pf driver just does nothing.  If vf will try to remove
other vlans when a port vlan is configured it will still produce error
as before.
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

TX MDD events reported on the PF are the result of the
PF misconfiguring a descriptor and not because of "bad actions"
by anything else.  No need to reset now because if it
results in a Tx hang, the Tx hang check will take care of it.
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

This patch changes the driver behavior when detecting a VF MDD event.
It now disables the VF after one event, which indicates a hw detected
problem in the VF.  Before this change, the PF would allow a couple of
events before doing the reset.
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Vladimir Oltean says:

====================
NXP SJA1105 DSA driver

This patchset adds a DSA driver for the SPI-controlled NXP SJA1105
switch.  Due to the hardware's unfriendliness, most of its state needs
to be shadowed in kernel memory by the driver. To support this and keep
a decent amount of cleanliness in the code, a new generic API for
converting between CPU-accessible ("unpacked") structures and
hardware-accessible ("packed") structures is proposed and used.

The driver is GPL-2.0 licensed. The source code files which are licensed
as BSD-3-Clause are hardware support files and derivative of the
userspace NXP sja1105-tool program, which is BSD-3-Clause licensed.

TODO items:
* Add support for traffic.
* Add full support for the P/Q/R/S series. The patches were mostly
  tested on a first-generation T device.
* Add timestamping support and PTP clock manipulation.
* Figure out how the tc-taprio hardware offload that was just proposed
  by Vinicius can be used to configure the switch's time-aware scheduler.
* Rework link state callbacks to use phylink once the SGMII port
  is supported.

Changes in v5:
1. Removed trailing empty lines at the end of files.
2. Moved the lib/packing.c file under a CONFIG_PACKING option instead of
   having it always built-in. The module is GPL licensed, which applies
   to its distribution in binary form, but the code is dual-licensed
   which means it can be used in projects with other licenses as well.
3. Made SJA1105 driver select CONFIG_PACKING and CONFIG_CRC32.

v4 patchset can be found at:
https://lwn.net/Articles/787077/

Changes in v4:
1. Previous patchset was broken apart, and for the moment the driver is
   configuring the switch as unmanaged. Support for regular and management
   traffic, as well as for PTP timestamping, will be submitted once the
   basic driver is accepted. Some core DSA patches were also broken out
   of the series, and are a dependency for this series:
   https://patchwork.ozlabs.org/project/netdev/list/?series=105069
2. Addressed Jiri Pirko's feedback about too generic function and macro
   naming.
3. Re-introduced ETH_P_DSA_8021Q.

v3 patchset can be found at:
https://lkml.org/lkml/2019/4/12/978

Changes in v3:
1. Removed the patch for a dedicated Ethertype to use with 802.1Q DSA
   tagging
2. Changed the SJA1105 switch tagging protocol sysfs label from
   "sja1105" to "8021q" to denote to users such as tcpdump that the
   structure is more generic.
3. Respun previous patch "net: dsa: Allow drivers to modulate between
   presence and absence of tagging". Current equivalent patch is called
   "net: dsa: Allow drivers to filter packets they can decode source
   port from" and at least allows reception of management traffic during
   the time when switch tagging is not enabled.
4. Added DSA-level fixes for the bridge core not unsetting
   vlan_filtering when ports leave. The global VLAN filtering is treated
   as a special case. Made the mt7530 driver use this. This patch
   benefits the SJA1105 because otherwise traffic in standalone mode
   would no longer work after removing the ports from a vlan_filtering
   bridge, since the driver and the hardware would be in an inconsistent
   state.
5. Restructured the documentation as rst. This depends upon the recently
   submitted "[PATCH net-next] Documentation: net: dsa: transition to
   the rst format": https://patchwork.ozlabs.org/patch/1084658/.

v2 patchset can be found at:
https://www.spinics.net/lists/netdev/msg563454.html

Changes in v2:
1. Device ID is no longer auto-detected but enforced based on explicit DT
   compatible string. This helps with stricter checking of DT bindings.
2. Group all device-specific operations into a sja1105_info structure and
   avoid using the IS_ET() and IS_PQRS() macros at runtime as much as possible.
3. Added more verbiage to commit messages and documentation.
4. Treat the case where RGMII internal delays are requested through DT bindings
   and return error.
5. Miscellaneous cosmetic cleanup in sja1105_clocking.c
6. Not advertising link features that are not supported, such as pause frames
   and the half duplex modes.
7. Fixed a mistake in previous patchset where the switch tagging was not
   actually enabled (lost during a rebase). This brought up another uncaught
   issue where switching at runtime between tagging and no-tagging was not
   supported by DSA. Fixed up the mistake in "net: dsa: sja1105: Add support
   for traffic through standalone ports", and added the new patch "net: dsa:
   Allow drivers to modulate between presence and absence of tagging" to
   address the other issue.
8. Added a workaround for switch resets cutting a frame in the middle of
   transmission, which would throw off some link partners.
9. Changed the TPID from ETH_P_EDSA (0xDADA) to a newly introduced one:
   ETH_P_DSA_8021Q (0xDADB). Uncovered another mistake in the previous patchset
   with a missing ntohs(), which was not caught because 0xDADA is
   endian-agnostic.
10. Made NET_DSA_TAG_8021Q select VLAN_8021Q
11. Renamed __dsa_port_vlan_add to dsa_port_vid_add and not to
    dsa_port_vlan_add_trans, as suggested, because the corresponding _del function
    does not have a transactional phase and the naming is more uniform this way.

v1 patchset can be found at:
https://www.spinics.net/lists/netdev/msg561589.html

Changes from RFC:
1. Removed the packing code for the static configuration tables that were
   not currently used
2. Removed the code for unpacking a static configuration structure from
   a memory buffer (not used)
3. Completely removed the SGMII stubs, since the configuration is not
   complete anyway.
4. Moved some code from the SJA1105 introduction commit into the patch
   that used it.
5. Made the code for checking global VLAN filtering generic and made b53
   driver use it.
6. Made mt7530 driver use the new generic dp->vlan_filtering
7. Fixed check for stringset in .get_sset_count
8. Minor cleanup in sja1105_clocking.c
9. Fixed a confusing typo in DSA

RFC can be found at:
https://www.mail-archive.com/netdev@vger.kernel.org/msg291717.html
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Ethernet flow control:

The switch MAC does not consume, nor does it emit pause frames. It
simply forwards them as any other Ethernet frame (and since the DMAC is,
per IEEE spec, 01-80-C2-00-00-01, it means they are filtered as
link-local traffic and forwarded to the CPU, which can't do anything
useful with them).

Duplex:

There is no duplex setting in the SJA1105 MAC. It is known to forward
traffic at line rate on the same port in both directions. Therefore it
must be that it only supports full duplex.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Resetting the switch at runtime is currently done while changing the
vlan_filtering setting (due to the required TPID change).

But reset is asynchronous with packet egress, and the switch core will
not wait for egress to finish before carrying on with the reset
operation.

As a result, a connected PHY such as the BCM5464 would see an
unterminated Ethernet frame and start to jabber (repeat the last seen
Ethernet symbols - jabber is by definition an oversized Ethernet frame
with bad FCS). This behavior is strange in itself, but it also causes
the MACs of some link partners (such as the FRDM-LS1012A) to completely
lock up.

So as a remedy for this situation, when switch reset is required, simply
inhibit Tx on all ports, and wait for the necessary time for the
eventual one frame left in the egress queue (not even the Tx inhibit
command is instantaneous) to be flushed.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

If STP is active, this setting is applied on bridged ports each time an
Ethernet link is established (topology changes).

Since the setting is global to the switch and a reset is required to
change it, resets are prevented if the new callback does not change the
value that the hardware already is programmed for.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

VLAN filtering cannot be properly disabled in SJA1105. So in order to
emulate the "no VLAN awareness" behavior (not dropping traffic that is
tagged with a VID that isn't configured on the port), we need to hack
another switch feature: programmable TPID (which is 0x8100 for 802.1Q).
We are reprogramming the TPID to a bogus value which leaves the switch
thinking that all traffic is untagged, and therefore accepts it.

Under a vlan_filtering bridge, the proper TPID of ETH_P_8021Q is
installed again, and the switch starts identifying 802.1Q-tagged
traffic.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There are two possible utilizations so far:

- Switch devices that don't support a native insertion/extraction header
  on the CPU port may still enjoy the benefits of port isolation with a
  custom VLAN tag.

  For this, they need to have a customizable TPID in hardware and a new
  Ethertype to distinguish between real 802.1Q traffic and the private
  tags used for port separation.

- Switches that don't support the deactivation of VLAN awareness, but
  still want to have a mode in which they accept all traffic, including
  frames that are tagged with a VLAN not configured on their ports, may
  use this as a fake to trick the hardware into thinking that the TPID
  for VLAN is something other than 0x8100.

What follows after the ETH_P_DSA_8021Q EtherType is a regular VLAN
header (TCI), however there is no other EtherType that can be used for
this purpose and doesn't already have a well-defined meaning.
ETH_P_8021AD, ETH_P_QINQ1, ETH_P_QINQ2 and ETH_P_QINQ3 expect that
another follow-up VLAN tag is present, which is not the case here.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ethernet.txt is confusing because
it says what the MAC should not do, but not what it *should* do:

  * "rgmii-rxid" (RGMII with internal RX delay provided by the PHY, the MAC
     should not add an RX delay in this case)

The gap in semantics is threefold:
1. Is it illegal for the MAC to apply the Rx internal delay by itself,
   and simplify the phy_mode (mask off "rgmii-rxid" into "rgmii") before
   passing it to of_phy_connect? The documentation would suggest yes.
1. For "rgmii-rxid", while the situation with the Rx clock skew is more
   or less clear (needs to be added by the PHY), what should the MAC
   driver do about the Tx delays? Is it an implicit wild card for the
   MAC to apply delays in the Tx direction if it can? What if those were
   already added as serpentine PCB traces, how could that be made more
   obvious through DT bindings so that the MAC doesn't attempt to add
   them twice and again potentially break the link?
3. If the interface is a fixed-link and therefore the PHY object is
   fixed (a purely software entity that obviously cannot add clock
   skew), what is the meaning of the above property?

So an interpretation of the RGMII bindings was chosen that hopefully
does not contradict their intention but also makes them more applied.
The SJA1105 driver understands to act upon "rgmii-*id" phy-mode bindings
if the port is in the PHY role (either explicitly, or if it is a
fixed-link). Otherwise it always passes the duty of setting up delays to
the PHY driver.

The error behavior that this patch adds is required on SJA1105E/T where
the MAC really cannot apply internal delays. If the other end of the
fixed-link cannot apply RGMII delays either (this would be specified
through its own DT bindings), then the situation requires PCB delays.

For SJA1105P/Q/R/S, this is however hardware supported and the error is
thus only temporary. I created a stub function pointer for configuring
delays per-port on RXC and TXC, and will implement it when I have access
to a board with this hardware setup.

Meanwhile do not allow the user to select an invalid configuration.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently only the (more difficult) first generation E/T series is
supported. Here the TCAM is only 4-way associative, and to know where
the hardware will search for a FDB entry, we need to perform the same
hash algorithm in order to install the entry in the correct bin.

On P/Q/R/S, the TCAM should be fully associative. However the SPI
command interface is different, and because I don't have access to a
new-generation device at the moment, support for it is TODO.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

At this moment the following is supported:
* Link state management through phylib
* Autonomous L2 forwarding managed through iproute2 bridge commands.

IP termination must be done currently through the master netdevice,
since the switch is unmanaged at this point and using
DSA_TAG_PROTO_NONE.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Georg Waibel <georg.waibel@sensor-technik.de>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This provides an unified API for accessing register bit fields
regardless of memory layout. The basic unit of data for these API
functions is the u64. The process of transforming an u64 from native CPU
encoding into the peripheral's encoding is called 'pack', and
transforming it from peripheral to native CPU encoding is 'unpack'.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This structure was used intensively for machine specific values
when DT was not used. Since the removal of AVR32 from the kernel,
this structure is only used for passing clocks from PCI macb wrapper, all
other fields being 0.
All other known platforms use DT.

Remove the leftovers but make sure that PCI macb still works as
expected by using default values:
- phydev->irq is set to PHY_POLL by mdiobus_alloc()
- mii_bus->phy_mask is cleared while allocating it
- bp->phy_interface is set to PHY_INTERFACE_MODE_MII if mode not found
in DT.

This simplifies driver probe path and particularly phy handling.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

While moving the chunk of code during 739de9a1
("net: macb: Reorganize macb_mii bringup"), the declaration of
struct phy_device declaration was kept. It's not useful in this
function as we alrady have a phydev pointer.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Three trivial overlapping conflicts.
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull networking fixes from David Miller:

 1) Out of bounds access in xfrm IPSEC policy unlink, from Yue Haibing.

 2) Missing length check for esp4 UDP encap, from Sabrina Dubroca.

 3) Fix byte order of RX STBC access in mac80211, from Johannes Berg.

 4) Inifnite loop in bpftool map create, from Alban Crequy.

 5) Register mark fix in ebpf verifier after pkt/null checks, from Paul
    Chaignon.

 6) Properly use rcu_dereference_sk_user_data in L2TP code, from Eric
    Dumazet.

 7) Buffer overrun in marvell phy driver, from Andrew Lunn.

 8) Several crash and statistics handling fixes to bnxt_en driver, from
    Michael Chan and Vasundhara Volam.

 9) Several fixes to the TLS layer from Jakub Kicinski (copying negative
    amounts of data in reencrypt, reencrypt frag copying, blind nskb->sk
    NULL deref, etc).

10) Several UDP GRO fixes, from Paolo Abeni and Eric Dumazet.

11) PID/UID checks on ipv6 flow labels are inverted, from Willem de
    Bruijn.

12) Use after free in l2tp, from Eric Dumazet.

13) IPV6 route destroy races, also from Eric Dumazet.

14) SCTP state machine can erroneously run recursively, fix from Xin
    Long.

15) Adjust AF_PACKET msg_name length checks, add padding bytes if
    necessary. From Willem de Bruijn.

16) Preserve skb_iif, so that forwarded packets have consistent values
    even if fragmentation is involved. From Shmulik Ladkani.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (69 commits)
  udp: fix GRO packet of death
  ipv6: A few fixes on dereferencing rt->from
  rds: ib: force endiannes annotation
  selftests: fib_rule_tests: print the result and return 1 if any tests failed
  ipv4: ip_do_fragment: Preserve skb_iif during fragmentation
  net/tls: avoid NULL pointer deref on nskb->sk in fallback
  selftests: fib_rule_tests: Fix icmp proto with ipv6
  packet: validate msg_namelen in send directly
  packet: in recvmsg msg_name return at least sizeof sockaddr_ll
  sctp: avoid running the sctp state machine recursively
  stmmac: pci: Fix typo in IOT2000 comment
  Documentation: fix netdev-FAQ.rst markup warning
  ipv6: fix races in ip6_dst_destroy()
  l2ip: fix possible use-after-free
  appletalk: Set error code if register_snap_client failed
  net: dsa: bcm_sf2: fix buffer overflow doing set_rxnfc
  rxrpc: Fix net namespace cleanup
  ipv6/flowlabel: wait rcu grace period before put_pid()
  vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach
  tcp: add sanity tests in tcp_add_backlog()
  ...

Pull io_uring fixes from Jens Axboe:
 "This is mostly io_uring fixes/tweaks. Most of these were actually done
  in time for the last -rc, but I wanted to ensure that everything
  tested out great before including them. The code delta looks larger
  than it really is, as it's mostly just comment additions/changes.

  Outside of the comment additions/changes, this is mostly removal of
  unnecessary barriers. In all, this pull request contains:

   - Tweak to how we handle errors at submission time. We now post a
     completion event if the error occurs on behalf of an sqe, instead
     of returning it through the system call. If the error happens
     outside of a specific sqe, we return the error through the system
     call. This makes it nicer to use and makes the "normal" use case
     behave the same as the offload cases. (me)

   - Fix for a missing req reference drop from async context (me)

   - If an sqe is submitted with RWF_NOWAIT, don't punt it to async
     context. Return -EAGAIN directly, instead of using it as a hint to
     do async punt. (Stefan)

   - Fix notes on barriers (Stefan)

   - Remove unnecessary barriers (Stefan)

   - Fix potential double free of memory in setup error (Mark)

   - Further improve sq poll CPU validation (Mark)

   - Fix page allocation warning and leak on buffer registration error
     (Mark)

   - Fix iov_iter_type() for new no-ref flag (Ming)

   - Fix a case where dio doesn't honor bio no-page-ref (Ming)"

* tag 'for-linus-20190502' of git://git.kernel.dk/linux-block:
  io_uring: avoid page allocation warnings
  iov_iter: fix iov_iter_type
  block: fix handling for BIO_NO_PAGE_REF
  io_uring: drop req submit reference always in async punt
  io_uring: free allocated io_memory once
  io_uring: fix SQPOLL cpu validation
  io_uring: have submission side sqe errors post a cqe
  io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUP
  io_uring: remove unnecessary barrier after incrementing dropped counter
  io_uring: remove unnecessary barrier before reading SQ tail
  io_uring: remove unnecessary barrier after updating SQ head
  io_uring: remove unnecessary barrier before reading cq head
  io_uring: remove unnecessary barrier before wq_has_sleeper
  io_uring: fix notes on barriers
  io_uring: fix handling SQEs requesting NOWAIT

Pull PCI fixes from Bjorn Helgaas:
 "I apologize for sending these so late in the cycle. We went back and
  forth about how to deal with the unexpected logging of intentional
  link state changes and finally decided to just config them off by
  default.

  PCI fixes:

   - Stop ignoring "pci=disable_acs_redir" parameter (Logan Gunthorpe)

   - Use shared MSI/MSI-X vector for Link Bandwidth Management (Alex
     Williamson)

   - Add Kconfig option for Link Bandwidth notification messages (Keith
     Busch)"

* tag 'pci-v5.1-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI/LINK: Add Kconfig option (default off)
  PCI/portdrv: Use shared MSI/MSI-X vector for Bandwidth Management
  PCI: Fix issue with "pci=disable_acs_redir" parameter being ignored

Pull MTD fix from Richard Weinberger:
 "A single regression fix for the marvell nand driver"

* tag 'mtd/fixes-for-5.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
  mtd: rawnand: marvell: Clean the controller state before each operation

e8303bb7 ("PCI/LINK: Report degraded links via link bandwidth
notification") added dmesg logging whenever a link changes speed or width
to a state that is considered degraded.  Unfortunately, it cannot
differentiate signal integrity-related link changes from those
intentionally initiated by an endpoint driver, including drivers that may
live in userspace or VMs when making use of vfio-pci.  Some GPU drivers
actively manage the link state to save power, which generates a stream of
messages like this:

  vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5 GT/s x16 link)

Since we can't distinguish the intentional changes from the signal
integrity issues, leave the reporting turned off by default.  Add a Kconfig
option to turn it on if desired.

Fixes: e8303bb7 ("PCI/LINK: Report degraded links via link bandwidth notification")
Link: https://lore.kernel.org/linux-pci/20190501142942.26972-1-keith.busch@intel.comSigned-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Fixes: d84aec42 ("net: ll_temac: Fix support for 64-bit platforms")
Signed-off-by: Esben Haabendal <esben@geanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

syzbot was able to crash host by sending UDP packets with a 0 payload.

TCP does not have this issue since we do not aggregate packets without
payload.

Since dev_gro_receive() sets gso_size based on skb_gro_len(skb)
it seems not worth trying to cope with padded packets.

BUG: KASAN: slab-out-of-bounds in skb_gro_receive+0xf5f/0x10e0 net/core/skbuff.c:3826
Read of size 16 at addr ffff88808893fff0 by task syz-executor612/7889

CPU: 0 PID: 7889 Comm: syz-executor612 Not tainted 5.1.0-rc7+ #96
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load16_noabort+0x14/0x20 mm/kasan/generic_report.c:133
 skb_gro_receive+0xf5f/0x10e0 net/core/skbuff.c:3826
 udp_gro_receive_segment net/ipv4/udp_offload.c:382 [inline]
 call_gro_receive include/linux/netdevice.h:2349 [inline]
 udp_gro_receive+0xb61/0xfd0 net/ipv4/udp_offload.c:414
 udp4_gro_receive+0x763/0xeb0 net/ipv4/udp_offload.c:478
 inet_gro_receive+0xe72/0x1110 net/ipv4/af_inet.c:1510
 dev_gro_receive+0x1cd0/0x23c0 net/core/dev.c:5581
 napi_gro_frags+0x36b/0xd10 net/core/dev.c:5843
 tun_get_user+0x2f24/0x3fb0 drivers/net/tun.c:1981
 tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2027
 call_write_iter include/linux/fs.h:1866 [inline]
 do_iter_readv_writev+0x5e1/0x8e0 fs/read_write.c:681
 do_iter_write fs/read_write.c:957 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:938
 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1002
 do_writev+0x15e/0x370 fs/read_write.c:1037
 __do_sys_writev fs/read_write.c:1110 [inline]
 __se_sys_writev fs/read_write.c:1107 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1107
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441cc0
Code: 05 48 3d 01 f0 ff ff 0f 83 9d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 51 93 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 74 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00
RSP: 002b:00007ffe8c716118 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007ffe8c716150 RCX: 0000000000441cc0
RDX: 0000000000000001 RSI: 00007ffe8c716170 RDI: 00000000000000f0
RBP: 0000000000000000 R08: 000000000000ffff R09: 0000000000a64668
R10: 0000000020000040 R11: 0000000000000246 R12: 000000000000c2d9
R13: 0000000000402b50 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 5143:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_kmalloc mm/kasan/common.c:497 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc mm/slab.c:3393 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3555
 mm_alloc+0x1d/0xd0 kernel/fork.c:1030
 bprm_mm_init fs/exec.c:363 [inline]
 __do_execve_file.isra.0+0xaa3/0x23f0 fs/exec.c:1791
 do_execveat_common fs/exec.c:1865 [inline]
 do_execve fs/exec.c:1882 [inline]
 __do_sys_execve fs/exec.c:1958 [inline]
 __se_sys_execve fs/exec.c:1953 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:1953
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 5351:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
 __cache_free mm/slab.c:3499 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3765
 __mmdrop+0x238/0x320 kernel/fork.c:677
 mmdrop include/linux/sched/mm.h:49 [inline]
 finish_task_switch+0x47b/0x780 kernel/sched/core.c:2746
 context_switch kernel/sched/core.c:2880 [inline]
 __schedule+0x81b/0x1cc0 kernel/sched/core.c:3518
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:3745
 retint_kernel+0x1b/0x2d
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline]
 kmem_cache_free+0xab/0x260 mm/slab.c:3766
 anon_vma_chain_free mm/rmap.c:134 [inline]
 unlink_anon_vmas+0x2ba/0x870 mm/rmap.c:401
 free_pgtables+0x1af/0x2f0 mm/memory.c:394
 exit_mmap+0x2d1/0x530 mm/mmap.c:3144
 __mmput kernel/fork.c:1046 [inline]
 mmput+0x15f/0x4c0 kernel/fork.c:1067
 exec_mmap fs/exec.c:1046 [inline]
 flush_old_exec+0x8d9/0x1c20 fs/exec.c:1279
 load_elf_binary+0x9bc/0x53f0 fs/binfmt_elf.c:864
 search_binary_handler fs/exec.c:1656 [inline]
 search_binary_handler+0x17f/0x570 fs/exec.c:1634
 exec_binprm fs/exec.c:1698 [inline]
 __do_execve_file.isra.0+0x1394/0x23f0 fs/exec.c:1818
 do_execveat_common fs/exec.c:1865 [inline]
 do_execve fs/exec.c:1882 [inline]
 __do_sys_execve fs/exec.c:1958 [inline]
 __se_sys_execve fs/exec.c:1953 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:1953
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88808893f7c0
 which belongs to the cache mm_struct of size 1496
The buggy address is located 600 bytes to the right of
 1496-byte region [ffff88808893f7c0, ffff88808893fd98)
The buggy address belongs to the page:
page:ffffea0002224f80 count:1 mapcount:0 mapping:ffff88821bc40ac0 index:0xffff88808893f7c0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00025b4f08 ffffea00027b9d08 ffff88821bc40ac0
raw: ffff88808893f7c0 ffff88808893e440 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808893fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808893ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808893ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff888088940000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888088940080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Fixes: e20cf8d3 ("udp: implement GRO for plain UDP sockets.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull power supply fixes from Sebastian Reichel:
 "Two more fixes for the 5.1 cycle.

  One division by zero fix in a specific driver and one core workaround
  for bad userspace behaviour from systemd regarding uevents. IMHO this
  can be considered to be a userspace bug, but the debug messages are
  useless anyways

   - cpcap-battery: fix a division by zero

   - core: fix systemd issue due to log messages produced by uevent"

* tag 'for-v5.1-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
  power: supply: sysfs: prevent endless uevent loop with CONFIG_POWER_SUPPLY_DEBUG
  power: supply: cpcap-battery: Fix division by zero

It is a followup after the fix in
commit 9c69a132 ("route: Avoid crash from dereferencing NULL rt->from")

rt6_do_redirect():
1. NULL checking is needed on rt->from because a parallel
   fib6_info delete could happen that sets rt->from to NULL.
   (e.g. rt6_remove_exception() and fib6_drop_pcpu_from()).

2. fib6_info_hold() is not enough.  Same reason as (1).
   Meaning, holding dst->__refcnt cannot ensure
   rt->from is not NULL or rt->from->fib6_ref is not 0.

   Instead of using fib6_info_hold_safe() which ip6_rt_cache_alloc()
   is already doing, this patch chooses to extend the rcu section
   to keep "from" dereference-able after checking for NULL.

inet6_rtm_getroute():
1. NULL checking is also needed on rt->from for a similar reason.
   Note that inet6_rtm_getroute() is using RTNL_FLAG_DOIT_UNLOCKED.

Fixes: a68886a6 ("net/ipv6: Make from in rt6_info rcu protected")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Wei Wang <weiwan@google.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

While the endiannes is being handled correctly as indicated by the comment
above the offending line - sparse was unhappy with the missing annotation
as be64_to_cpu() expects a __be64 argument. To mitigate this annotation
all involved variables are changed to a consistent __le64 and the
 conversion to uint64_t delayed to the call to rds_cong_map_updated().
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Maxime Chevallier says:

====================
net: mvpp2: cls: Add classification

This series is a rework of the previously standalone patch adding
classification support for mvpp2 :

https://lore.kernel.org/netdev/20190423075031.26074-1-maxime.chevallier@bootlin.com/

This patch has been reworked according to Saeed's review, to make sure
that the location of the rule is always respected and serves as a way to
prioritize rules between each other. This the 3rd iteration of this
submission, but since it's now a series, I reset the revision numbering.

This series implements that in a limited configuration for now, since we
limit the total number of rules per port to 4.

The main factors for this limitation are that :
 - We share the classification tables between all ports (4 max, although
   one is only used for internal loopback), hence we have to perform a
   logical separation between rules, which is done today by dedicated
   ranges for each port in each table

 - The "Flow table", which dictates which lookups operations are
   performed for an ingress packet, in subdivided into 22 "sub flows",
   each corresponding to a traffic type based on the L3 proto, L4
   proto, the presence or not of a VLAN tag and the L3 fragmentation.

   This makes so that when adding a rule, it has to be added into each
   of these subflows, introducing duplications of entries and limiting
   our max number of entries.

These limitations can be overcomed in several ways, but for readability
sake, I'd rather submit basic classification offload support for now,
and improve it gradually.

This series also adds a small cosmetic cleanup patch (1), and also adds
support for the "Drop" action compared to the first submission of this
feature. It is simple enough to be added with this basic support.

Compared to the first submissions, the NETIF_F_NTUPLE flag was also
removed, following Saeed's comment.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

This commit introduces support for the "Drop" action in classification
offload. This corresponds to the "-1" action with ethtool -N.

This is achieved using the color marking actions available in the C2
engine, which associate a color to a packet. These colors can be either
Green, Yellow or Red, Red meaning that the packet should be dropped.

Green and Yellow colors are interpreted by the Policer, which isn't
supported yet.

This method of dropping using the Classifier is different than the
already existing early-drop features, such as VLAN filtering and MAC
UC/MC filtering, which are performed during the Parsing step, and
therefore take precedence over classification actions.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This commit introduces basic classification offloading support for the
PPv2 controller.

The PPv2 classifier has many classification engines, for now we only use
the C2 TCAM match engine.

This engine allows to perform ternary lookups on 64 bits keys (called
Header Extracted Key), that are built by extracting fields from the packet
header and concatenating them. At most 4 fields can be extracted for a
single lookup.

This basic implementation allows to build the HEK from the following
fields :
 - L4 source and destination ports (for UDP and TCP)

More fields are to be added in the future.

Classification flows are added through the ethtool interface, using the
newly introduced flow_rule infrastructure as an internal rule
representation, allowing to more easily implement tc flower rules if
need be.

The internal design for now allocates one range of 4 rules per port
due to the internal design of the flow table, which uses 22 sub-flows.

When inserting a classification rule, the rule is created in every
relevant sub-flow.

This low rule-count is a very simple design which reaches quickly the
limitations of the flow table ordering, but guarantees that the rule
ordering will always be respected.

This commit only introduces support for the "steer to rxq" action.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As of today, the classification code is used only for RSS. We split the
incoming traffic into multiple flows, that correspond to the ethtool
flow_type parameter.

We don't want to use the ethtool flow definitions such as TCP_V4_FLOW,
for several reason :

 - We want to decorrelate the driver code from ethtool as much as
   possible, so that we can easily use other interfaces such as tc flower,

 - We want the flow_type to be a bitfield, so that we can match flows
   embedded into each other, such as TCP4 which is a subset of IP4.

This commit does the conversion to the newer type.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Cosmetic patch removing extra whitespaces when writing the flow_table
entries
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull ARC fixes from Vineet Gupta:
 "A few minor fixes for ARC.

   - regression in memset if line size !64

   - avoid panic if PAE and IOC"

* tag 'arc-5.1-final' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: memset: fix build with L1_CACHE_SHIFT != 6
  ARC: [hsdk] Make it easier to add PAE40 region to DTB
  ARC: PAE40: don't panic and instead turn off hw ioc

The Interrupt Message Number in the PCIe Capabilities register (PCIe r4.0,
sec 7.5.3.2) indicates which MSI/MSI-X vector is shared by interrupts
related to the PCIe Capability, including Link Bandwidth Management and
Link Autonomous Bandwidth Interrupts (Link Control, 7.5.3.7), Command
Completed and Hot-Plug Interrupts (Slot Control, 7.5.3.10), and the PME
Interrupt (Root Control, 7.5.3.12).

pcie_message_numbers() checked whether we want to enable PME or Hot-Plug
interrupts but neglected to check for Link Bandwidth Management, so if we
only wanted the Bandwidth Management interrupts, it decided we didn't need
any vectors at all.  Then pcie_port_enable_irq_vec() tried to reallocate
zero vectors, which failed, resulting in fallback to INTx.

On some systems, e.g., an X79-based workstation, that INTx seems broken or
not handled correctly, so we got spurious IRQ16 interrupts for Bandwidth
Management events.

Change pcie_message_numbers() so that if we want Link Bandwidth Management
interrupts, we use the shared MSI/MSI-X vector from the PCIe Capabilities
register.

Fixes: e8303bb7 ("PCI/LINK: Report degraded links via link bandwidth notification")
Link: https://lore.kernel.org/lkml/155597243666.19387.1205950870601742062.stgit@gimli.homeSigned-off-by: Alex Williamson <alex.williamson@redhat.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>