This patch support for cable test for the ksz886x switches and the
ksz8081 PHY.

The patch was tested on a KSZ8873RLL switch with following results:

- port 1:
  - provides invalid values, thus return -ENOTSUPP
    (Errata: DS80000830A: "LinkMD does not work on Port 1",
     http://ww1.microchip.com/downloads/en/DeviceDoc/KSZ8873-Errata-DS80000830A.pdf)

- port 2:
  - can detect distance
  - can detect open on each wire of pair A (wire 1 and 2)
  - can detect open only on one wire of pair B (only wire 3)
  - can detect short between wires of a pair (wires 1 + 2 or 3 + 6)
  - short between pairs is detected as open.
    For example short between wires 2 + 3 is detected as open.
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The current get_phy_flags() is only processed when we connect to a PHY
via a designed phy-handle property via phylink_of_phy_connect(), but if
we fallback on the internal MDIO bus created by a switch and take the
dsa_slave_phy_connect() path then we would not be processing that flag
and using it at PHY connection time.
Suggested-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add mapping for LINK_MD register to enable cable testing functionality.
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support for MDI-X status and configuration
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support for MDI-X status and configuration
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch changes the alignments to one space between "#define" and the
macro.
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NVladimir Oltean <olteanv@gmail.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds the phylink support to the ksz8795 driver to provide
configuration exceptions on quirky KSZ8863 and KSZ8873 ports.
Signed-off-by: NMichael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NVladimir Oltean <olteanv@gmail.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Some micrel devices share the same PHY register defines. This patch
moves them to one common header so other drivers can reuse them.
And reuse generic MII_* defines where possible.
Signed-off-by: NMichael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: NOleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: NVladimir Oltean <olteanv@gmail.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

If link mtu is too big, mld_newpack() allocates high-order page.
But most mld packets don't need high-order page.
So, it might waste unnecessary pages.
To avoid this, it makes mld_newpack() try to allocate order-0 page.
Suggested-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NTaehee Yoo <ap420073@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A recent change tidied up some conditional code, avoiding the use of
some #ifdefs.  Unfortunately, if CONFIG_IPV6 was not enabled, it
meant that two functions were referenced but never defined.

The easiest fix is to just define stubs for these functions if
CONFIG_IPV6 is not defined.  This will soon be simplified further
by some other development in the works...
Reported-by: Nkernel test robot <lkp@intel.com>
Fixes: 75db5b07 ("net: qualcomm: rmnet: eliminate some ifdefs")
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The variable err is being initialized with a value that is never read, the
assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The pointer of_node is being initialized with a value that is never
read and it is being updated later with a new value inside a do-while
loop. The initialization is redundant and can be removed and the
pointer dev is no longer required and can be removed too.

Addresses-Coverity: ("Unused value")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Current MCAM allocation scheme allocates a single lot of
MCAM entries for ntuple filters, unicast filters and VF VLAN
rules. This patch attempts to cleanup this logic by segregating
MCAM rule allocation and management for Ntuple rules and unicast,
VF VLAN rules. This segregation will result in reusing most of
the logic for supporting ntuple filters for VF devices.

Also added debug messages for MCAM entry allocation failures.
Signed-off-by: NSunil Goutham <sgoutham@marvell.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Test cleanup path for routes usinig nexthop objects before the
reference is taken on the nexthop. Specifically, bad metric for
ipv4 and ipv6 and source routing for ipv6.

Selftests that correspond to the recent bug fix:
    821bbf79 ("ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions")
Signed-off-by: NDavid Ahern <dsahern@kernel.org>
Cc: Coco Li <lixiaoyan@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

M Chetan Kumar says:

====================
net: iosm: PCIe Driver for Intel M.2 Modem

The IOSM (IPC over Shared Memory) driver is a PCIe host driver implemented
for linux or chrome platform for data exchange over PCIe interface between
Host platform & Intel M.2 Modem. The driver exposes interface conforming to
the MBIM protocol. Any front end application ( eg: Modem Manager) could
easily manage the MBIM interface to enable data communication towards WWAN.

Intel M.2 modem uses 2 BAR regions. The first region is dedicated to Doorbell
register for IRQs and the second region is used as scratchpad area for book
keeping modem execution stage details along with host system shared memory
region context details. The upper edge of the driver exposes the control and
data channels for user space application interaction. At lower edge these data
and control channels are associated to pipes. The pipes are lowest level
interfaces used over PCIe as a logical channel for message exchange. A single
channel maps to UL and DL pipe and are initialized on device open.

On UL path, driver copies application sent data to SKBs associate it with
transfer descriptor and puts it on to ring buffer for DMA transfer. Once
information has been updated in shared memory region, host gives a Doorbell
to modem to perform DMA and modem uses MSI to communicate back to host.
For receiving data in DL path, SKBs are pre-allocated during pipe open and
transfer descriptors are given to modem for DMA transfer.

The driver exposes two types of ports, namely "wwan0mbim0", a char device node
which is used for MBIM control operation and "wwan0-x",(x = 0,1,2..7) network
interfaces for IP data communication.
1) MBIM Control Interface:
This node exposes an interface between modem and application using char device
exposed by "IOSM" driver to establish and manage the MBIM data communication
with PCIe based Intel M.2 Modems.

2) MBIM Data Interface:
The IOSM driver exposes IP link interface "wwan0-x" of type "wwan" for IP traffic.
Iproute network utility is used for creating "wwan0-x" network interface and for
associating it with MBIM IP session. The Driver supports upto 8 IP sessions for
simultaneous IP communication.

This applies on top of WWAN core rtnetlink series posted here:
https://lore.kernel.org/netdev/1623486057-13075-1-git-send-email-loic.poulain@linaro.org/

Also driver has been compiled and tested on top of netdev net-next tree.
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Kconfig & Makefile changes for IOSM Driver compilation.
2) Add IOSM Driver documentation.
3) Modified MAINTAINER file for IOSM Driver addition.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Create net device & implement net operations for data/IP communication.
2) Bind IP Link to mux IP session for simultaneous IP traffic.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Report modem status via uevent.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Update UL/DL transfer descriptors in message ring.
2) Define message set for pipe/sleep protocol.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Defines messaging protocol for handling Transfer Descriptor
   in both UL/DL direction.
2) Ring buffer management.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Implements state machine to handle host & device sleep.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Encode UL packet into datagram.
2) Decode DL datagram and route it to network layer.
3) Supports credit based flow control.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Establish IP session between host-device & session management.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Bottom half(tasklet) for IRQ and task processing.
2) Tasks are processed asynchronous and synchronously.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Implements wwan port for MBIM & AT protocol communication
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Defines pipes & channel configurations like channel type,
pipe mappings, No. of transfer descriptors and transfer
buffer size etc.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Binds logical channel between host-device for communication.
2) Implements device specific(Char/Net) IO operations.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Initializes shared memory for host-device communication.
2) Allocate resources required for control & data operations.
3) Transfers the Device IRQ to IPC execution thread.
4) Defines the timer cbs for async events.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Initializes the Scratchpad region for Host-Device communication.
2) Exposes device capabilities like chip info and device execution
   stages.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Request interrupt vector, frees allocated resource.
2) Registers IRQ handler.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

1) Register IOSM driver with kernel to manage Intel WWAN PCIe
   device(PCI_VENDOR_ID_INTEL, INTEL_CP_DEVICE_7560_ID).
2) Exposes the EP PCIe device capability to Host PCIe core.
3) Initializes PCIe EP configuration and defines PCIe driver probe, remove
   and power management OPS.
4) Allocate and map(dma) skb memory for data communication from device to
   kernel and vice versa.
Signed-off-by: NM Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Alex Elder says:

====================
net: qualcomm: rmnet: MAPv4 download checksum cleanup, part 2

This is part 2 of a large series that reworks some code that handles
downloaded packets when MAPv4 checksum offload is enabled.  The
first part, which includes an overview, is here:
  https://lore.kernel.org/netdev/20210611190529.3085813-1-elder@linaro.org/

This second part of the series completes the simplification of this
handling code, removing unnecessary byte swaps and bitwise inversions
of checksum values, and along the way avoids the need for almost all
of the forced type casts.  The checksum field in an RMNet download
trailer is given __sum16_t type to accurately reflect the meaning of
that field.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We don't support any extension headers for IPv6 packets.  Extension
headers therefore contribute 0 bytes to the payload length.  As a
result we can just use the IPv6 payload length as the length used to
compute the pseudo header checksum for both UDP and TCP messages.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We compare a payload checksum with a pseudo checksum value for
equality in rmnet_map_ipv4_dl_csum_trailer().  Both of those values
are computed with a unary NOT (~) operation.  The result of the
comparison is the same if we omit that NOT for both values.

Remove these operations in rmnet_map_ipv6_dl_csum_trailer() also.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The csum_value field in the rmnet_map_dl_csum_trailer structure is a
"real" Internet checksum.  It is a 16 bit value, in big endian format,
which represents an inverted ones' complement sum over pairs of bytes.

Make that clear by changing its type to __sum16.

This makes a typecast in rmnet_map_ipv4_dl_csum_trailer() and
another in rmnet_map_ipv6_dl_csum_trailer() unnecessary.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The previous patch makes rmnet_map_ipv4_dl_csum_trailer() return
early with an error if it is determined that the computed checksum
for the IP payload does not match what was expected.

If the computed checksum *does* match the expected value, the IP
payload (i.e., the transport message), can be considered good.
There is no need to do any further processing of the message.

This means a big block of code is unnecessary for validating the
transport checksum value, and can be removed.

Make comparable changes in rmnet_map_ipv6_dl_csum_trailer().
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In rmnet_map_ipv4_dl_csum_trailer(), if the sum of the trailer
checksum and the pseudo checksum is non-zero, checksum validation
has failed.  We can return an error as soon as we know that.

We can do the same thing in rmnet_map_ipv6_dl_csum_trailer().

Add some comments that explain where we're headed.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch simply demonstrates that a checksum value computed when
verifying an offloaded transport checksum value for both IPv4 and
IPv6 is (normally) 0.  It can be squashed into the next patch.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

With the ones' complement arithmetic, the sum of two negated values
is equal to the negation of the sum of the two original values [1].
Rearrange the calculation ip6_payload_sum using this property.

[1] https://tools.ietf.org/html/rfc1071Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In rmnet_map_ipv4_dl_csum_trailer(), remove the "csum_temp" and
"addend" local variables, and simplify a few lines of code.

Remove the "csum_temp", "csum_value", "ip6_hdr_csum", and "addend"
local variables in rmnet_map_ipv6_dl_csum_trailer(), and simplify a
few lines of code there as well.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>