Replace the 32-bit unsigned used to track enabled endpoints with a
Linux bitmap, to allow an arbitrary number of endpoints to be
represented.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace the 32-bit unsigned used to track endpoints that have
completed setup with a Linux bitmap, to allow an arbitrary number
of endpoints to be represented.

Rework the error handling in ipa_endpoint_init() so the defined
endpoint bitmap is freed if an error occurs early.  Once endpoints
have been initialized, ipa_endpoint_exit() is used to recover if
the set of filtered endpoints is invalid.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Prior to IPA v5.0, there could be no more than 32 endpoints.

A filter table begins with a bitmap indicating which endpoints have
a filter defined.  That bitmap is currently assumed to fit in a
32-bit value.

Starting with IPA v5.0, more than 32 endpoints are supported, so
it's conceivable that a TX endpoint has an ID that exceeds 32.
Increase the size of the field representing endpoints that support
filtering to 64 bits.  Rename the bitmap field "filtered".

Unlike other similar fields, we do not use an (arbitrarily long)
Linux bitmap for this purpose.  The reason is that if a filter table
ever *did* need to support more than 64 TX endpoints, its format
would change in ways we can't anticipate.

Have ipa_endpoint_init() return a negative errno rather than a mask
that indicates which endpoints support filtering, and have that
function assign the "filtered" field directly.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Similar to the previous patch, replace the 32-bit unsigned used to
track endpoints supported by hardware with a Linux bitmap, to allow
an arbitrary number of endpoints to be represented.

Move ipa_endpoint_deconfig() above ipa_endpoint_config() and use
it in the error path of the latter function.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

IPA v5.0 supports more than 32 endpoints, so we will be unable to
represent endpoints defined in the configuration data with a 32-bit
value.  To prepare for that, convert the field in the IPA structure
representing defined endpoints to be a Linux bitmap.

Convert loops based on that field into for_each_set_bit() calls over
the new bitmap.  Note that the loop in ipa_endpoint_config() still
assumes there are 32 or fewer endpoints (when comparing against the
available endpoint bit mask); that assumption goes away in the next
patch.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The SUSPEND_INFO, SUSPEND_EN, SUSPEND_CLR registers represent
endpoint IDs in a bit mask.  When more than 32 endpoints are
supported, these registers will be replicated as needed to represent
the number of supported endpoints.  Update the definitions of these
registers to have a stride of 4 bytes, and update the code that
operates them to select the proper offset and bit.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Starting with IPA v5.0, a single IPA instance can have more than 32
endpoints defined.  To handle this, each register that holds a
bitmap of IPA endpoints is replicated as needed to represent the
available endpoints.

To prepare for this, registers that represent endpoint IDs in a bit
mask will be defined to have a parameter, with a stride value of 4
bytes.  The first 32 endpoints are represented in the first 32-bit
register, then the next (up to) 32 endpoints at an offset 4 bytes
higher.  When accessing such a register, the endpoint ID divided
by 32 determines the offset, and the endpoint ID modulo 32 defines
the endpoint's bit position within the register.

The first two registers we'll update for this are STATE_AGGR_ACTIVE
and AGGR_FORCE_CLOSE.

Until more than 32 endpoints are supported, this change has no
practical effect.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Similar to the previous commit, pass flags rather than a memory
region ID to ipa_table_reset_add(), and there use ipa_table_mem() to
look up the memory region affected based on those flags.

Currently all eight of these table memory regions are assumed to
exist, because they all have canaries within them.  Stop assuming
that will always be the case, and in ipa_table_reset_add() allow
these memory regions to be non-existent.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Recently ipa_table_mem() was added as a way to look up one of 8
possible memory regions by indicating whether it was a filter or
route table, hashed or not, and IPv6 or not.

We can simplify the interface to ipa_table_init_add() by passing two
flags to it instead of the opcode and both hashed and non-hashed
memory region IDs.  The "filter" and "ipv6" flags are sufficient to
determine the opcode to use, and with ipa_table_mem() can look up
the correct memory region as well.

It's possible to not have hashed tables, but we already verify the
number of entries in a filter or routing table is nonzero.  Stop
assuming a hashed table entry exists in ipa_table_init_add().
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Variable total_payload_len is being used to accumulate payload lengths
however it is never read or used afterwards. It is redundant and can
be removed.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Tony Nguyen says:

====================
Intel Wired LAN Driver Updates 2022-11-02 (i40e, iavf)

This series contains updates to i40e and iavf drivers.

Joe Damato adds tracepoint information to i40e_napi_poll to expose helpful
debug information for users who'd like to get a better understanding of
how their NIC is performing as they adjust various parameters and tuning
knobs.

Note: this does not touch any XDP related code paths. This
tracepoint will only work when not using XDP. Care has been taken to avoid
changing control flow in i40e_napi_poll with this change.

Alicja adds error messaging for unsupported duplex settings for i40e.

Ye Xingchen replaces use of __FUNCTION__ with __func__ for iavf.

Bartosz changes tense of device removal message to be more clear on the
action for iavf.

* '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue:
  iavf: Change information about device removal in dmesg
  iavf: Replace __FUNCTION__ with __func__
  i40e: Add appropriate error message logged for incorrect duplex setting
  i40e: Add i40e_napi_poll tracepoint
  i40e: Record number of RXes cleaned during NAPI
  i40e: Record number TXes cleaned during NAPI
  i40e: Store the irq number in i40e_q_vector
====================

Link: https://lore.kernel.org/r/20221102211011.2944983-1-anthony.l.nguyen@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Tony Nguyen says:

====================
Intel Wired LAN Driver Updates 2022-11-02 (e1000e, e1000, igc)

This series contains updates to e1000e, e1000, and igc drivers.

For e1000e, Sasha adds a new board type to help distinguish platforms and
adds device id support for upcoming platforms. He also adds trace points
for CSME flows to aid in debugging.

Ani removes unnecessary kmap_atomic call for e1000 and e1000e.

Muhammad sets speed based transmit offsets for launchtime functionality to
reduce latency for igc.

* '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue:
  igc: Correct the launchtime offset
  e1000: Remove unnecessary use of kmap_atomic()
  e1000e: Remove unnecessary use of kmap_atomic()
  e1000e: Add e1000e trace module
  e1000e: Add support for the next LOM generation
  e1000e: Separate MTP board type from ADP
====================

Link: https://lore.kernel.org/r/20221102203957.2944396-1-anthony.l.nguyen@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),
indirect call targets are validated against the expected function
pointer prototype to make sure the call target is valid to help mitigate
ROP attacks. If they are not identical, there is a failure at run time,
which manifests as either a kernel panic or thread getting killed. A
proposed warning in clang aims to catch these at compile time, which
reveals:

  drivers/net/hamradio/baycom_epp.c:1119:25: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict]
          .ndo_start_xmit      = baycom_send_packet,
                                ^~~~~~~~~~~~~~~~~~
  1 error generated.

->ndo_start_xmit() in 'struct net_device_ops' expects a return type of
'netdev_tx_t', not 'int'. Adjust the return type of baycom_send_packet()
to match the prototype's to resolve the warning and CFI failure.

Link: https://github.com/ClangBuiltLinux/linux/issues/1750Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221102160610.1186145-1-nathan@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),
indirect call targets are validated against the expected function
pointer prototype to make sure the call target is valid to help mitigate
ROP attacks. If they are not identical, there is a failure at run time,
which manifests as either a kernel panic or thread getting killed. A
proposed warning in clang aims to catch these at compile time, which
reveals:

  drivers/net/ethernet/ti/netcp_core.c:1944:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict]
          .ndo_start_xmit         = netcp_ndo_start_xmit,
                                    ^~~~~~~~~~~~~~~~~~~~
  1 error generated.

->ndo_start_xmit() in 'struct net_device_ops' expects a return type of
'netdev_tx_t', not 'int'. Adjust the return type of
netcp_ndo_start_xmit() to match the prototype's to resolve the warning
and CFI failure.

Link: https://github.com/ClangBuiltLinux/linux/issues/1750Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221102160933.1601260-1-nathan@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.

In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.

While at it, include the corresponding header file (<linux/kstrtox.h>).
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/d4432a67b6f769cac0a9ec910ac725298b64e102.1667336095.git.christophe.jaillet@wanadoo.frSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Jiri Pirko says:

====================
net: fix netdev to devlink_port linkage and expose to user

Currently, the info about linkage from netdev to the related
devlink_port instance is done using ndo_get_devlink_port().
This is not sufficient, as it is up to the driver to implement it and
some of them don't do that. Also it leads to a lot of unnecessary
boilerplate code in all the drivers.

Instead of that, introduce a possibility for driver to expose this
relationship by new SET_NETDEV_DEVLINK_PORT macro which stores it into
dev->devlink_port. It is ensured by the driver init/fini flows that
the devlink_port pointer does not change during the netdev lifetime.
Devlink port is always registered before netdev register and
unregistered after netdev unregister.

Benefit from this linkage setup and remove explicit calls from driver
to devlink_port_type_eth_set() and clear(). Many of the driver
didn't use it correctly anyway. Let the devlink.c to track associated
netdev events and adjust type and type pointer accordingly. Also
use this events to to keep track on ifname change and remove RTNL lock
taking from devlink_nl_port_fill().

Finally, remove the ndo_get_devlink_port() ndo which is no longer used
and expose devlink_port handle as a new netdev netlink attribute to the
user. That way, during the ifname->devlink_port lookup, userspace app
does not have to dump whole devlink port list and instead it can just
do a simple RTM_GETLINK query.
====================

Link: https://lore.kernel.org/r/20221102160211.662752-1-jiri@resnulli.usSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Expose devlink port handle related to netdev over rtnetlink. Introduce a
new nested IFLA attribute to carry the info. Call into devlink code to
fill-up the nest with existing devlink attributes that are used over
devlink netlink.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Remove ndo_get_devlink_port which is no longer used alongside with the
implementations in drivers.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Use newly introduced devlink_port pointer instead of getting it calling
to ndo_get_devlink_port op.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

By the time port unregister is called. There should be no type set. Make
sure that the driver cleared it before and warn in case it didn't. This
enforces symmetricity with type set and port register.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

To avoid a need to take RTNL mutex in port_fill() function, benefit from
the introduce infrastructure that tracks netdevice notifier events.
Store the ifindex and ifname upon register and change name events.
Remove the rtnl_held bool propagated down to port_fill() function as it
is no longer needed.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

It is ensured by the netdevice notifier event processing, that only
netdev pointers from the same net namespaces are filled. Remove the
net namespace check from devlink_nl_port_fill() as it is no longer
needed.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Since devlink_port_type_eth_set() should no longer be called by any
driver with netdev pointer as it should rather use
SET_NETDEV_DEVLINK_PORT, remove the netdev arg. Add a warn to
type_clear()
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Benefit from the previously implemented tracking of netdev events in
devlink code and instead of calling  devlink_port_type_eth_set() and
devlink_port_type_clear() to set devlink port type and link to related
netdev, use SET_NETDEV_DEVLINK_PORT() macro to assign devlink_port
pointer to netdevice which is about to be registered.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Currently, ethernet drivers are using devlink_port_type_eth_set() and
devlink_port_type_clear() to set devlink port type and link to related
netdev.

Instead of calling them directly, let the driver use
SET_NETDEV_DEVLINK_PORT macro to assign devlink_port pointer and let
devlink to track it. Note the devlink port pointer is static during
the time netdevice is registered.

In devlink code, use per-namespace netdev notifier to track
the netdevices with devlink_port assigned and change the internal
devlink_port type and related type pointer accordingly.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Follow-up patch is going to introduce a netdevice notifier event
processing which is called with RTNL mutex held. Processing of this will
eventually lead to call to port_notity() and port_fill() which currently
takes RTNL mutex internally. So as a temporary solution, propagate a
bool indicating if the mutex is already held. This will go away in one
of the follow-up patches.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

As __devlink_port_type_set() is going to be called directly from netdevice
notifier event handle in one of the follow-up patches, move the
port_type_netdev_checks() call there.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

As __devlink_port_type_set() is going to be called directly from netdevice
notifier event handle in one of the follow-up patches, move the
port_type_warn_schedule() call there.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Instead of storing type_dev as a void pointer, convert it to union and
use it to store either struct net_device or struct ib_device pointer.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Ido Schimmel says:

====================
bridge: Add MAC Authentication Bypass (MAB) support

Patch #1 adds MAB support in the bridge driver. See the commit message
for motivation, design choices and implementation details.

Patch #2 adds corresponding test cases.

Follow-up patchsets will add offload support in mlxsw and mv88e6xxx.
====================

Link: https://lore.kernel.org/r/20221101193922.2125323-1-idosch@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Add four test cases to verify MAB functionality:

* Verify that a locked FDB entry can be generated by the bridge,
  preventing a host from communicating via the bridge. Test that user
  space can clear the "locked" flag by replacing the entry, thereby
  authenticating the host and allowing it to communicate via the bridge.

* Test that an entry cannot roam to a locked port, but that it can roam
  to an unlocked port.

* Test that MAB can only be enabled on a port that is both locked and
  has learning enabled.

* Test that locked FDB entries are flushed from a port when MAB is
  disabled.
Signed-off-by: Hans J. Schultz <netdev@kapio-technology.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Hosts that support 802.1X authentication are able to authenticate
themselves by exchanging EAPOL frames with an authenticator (Ethernet
bridge, in this case) and an authentication server. Access to the
network is only granted by the authenticator to successfully
authenticated hosts.

The above is implemented in the bridge using the "locked" bridge port
option. When enabled, link-local frames (e.g., EAPOL) can be locally
received by the bridge, but all other frames are dropped unless the host
is authenticated. That is, unless the user space control plane installed
an FDB entry according to which the source address of the frame is
located behind the locked ingress port. The entry can be dynamic, in
which case learning needs to be enabled so that the entry will be
refreshed by incoming traffic.

There are deployments in which not all the devices connected to the
authenticator (the bridge) support 802.1X. Such devices can include
printers and cameras. One option to support such deployments is to
unlock the bridge ports connecting these devices, but a slightly more
secure option is to use MAB. When MAB is enabled, the MAC address of the
connected device is used as the user name and password for the
authentication.

For MAB to work, the user space control plane needs to be notified about
MAC addresses that are trying to gain access so that they will be
compared against an allow list. This can be implemented via the regular
learning process with the sole difference that learned FDB entries are
installed with a new "locked" flag indicating that the entry cannot be
used to authenticate the device. The flag cannot be set by user space,
but user space can clear the flag by replacing the entry, thereby
authenticating the device.

Locked FDB entries implement the following semantics with regards to
roaming, aging and forwarding:

1. Roaming: Locked FDB entries can roam to unlocked (authorized) ports,
   in which case the "locked" flag is cleared. FDB entries cannot roam
   to locked ports regardless of MAB being enabled or not. Therefore,
   locked FDB entries are only created if an FDB entry with the given {MAC,
   VID} does not already exist. This behavior prevents unauthenticated
   devices from disrupting traffic destined to already authenticated
   devices.

2. Aging: Locked FDB entries age and refresh by incoming traffic like
   regular entries.

3. Forwarding: Locked FDB entries forward traffic like regular entries.
   If user space detects an unauthorized MAC behind a locked port and
   wishes to prevent traffic with this MAC DA from reaching the host, it
   can do so using tc or a different mechanism.

Enable the above behavior using a new bridge port option called "mab".
It can only be enabled on a bridge port that is both locked and has
learning enabled. Locked FDB entries are flushed from the port once MAB
is disabled. A new option is added because there are pure 802.1X
deployments that are not interested in notifications about locked FDB
entries.
Signed-off-by: Hans J. Schultz <netdev@kapio-technology.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

No conflicts.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Pull networking fixes from Paolo Abeni:
 "Including fixes from bluetooth and netfilter.

  Current release - regressions:

   - net: several zerocopy flags fixes

   - netfilter: fix possible memory leak in nf_nat_init()

   - openvswitch: add missing .resv_start_op

  Previous releases - regressions:

   - neigh: fix null-ptr-deref in neigh_table_clear()

   - sched: fix use after free in red_enqueue()

   - dsa: fall back to default tagger if we can't load the one from DT

   - bluetooth: fix use-after-free in l2cap_conn_del()

  Previous releases - always broken:

   - netfilter: netlink notifier might race to release objects

   - nfc: fix potential memory leak of skb

   - bluetooth: fix use-after-free caused by l2cap_reassemble_sdu

   - bluetooth: use skb_put to set length

   - eth: tun: fix bugs for oversize packet when napi frags enabled

   - eth: lan966x: fixes for when MTU is changed

   - eth: dwmac-loongson: fix invalid mdio_node"

* tag 'net-6.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (53 commits)
  vsock: fix possible infinite sleep in vsock_connectible_wait_data()
  vsock: remove the unused 'wait' in vsock_connectible_recvmsg()
  ipv6: fix WARNING in ip6_route_net_exit_late()
  bridge: Fix flushing of dynamic FDB entries
  net, neigh: Fix null-ptr-deref in neigh_table_clear()
  net/smc: Fix possible leaked pernet namespace in smc_init()
  stmmac: dwmac-loongson: fix invalid mdio_node
  ibmvnic: Free rwi on reset success
  net: mdio: fix undefined behavior in bit shift for __mdiobus_register
  Bluetooth: L2CAP: Fix attempting to access uninitialized memory
  Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm
  Bluetooth: L2CAP: Fix accepting connection request for invalid SPSM
  Bluetooth: hci_conn: Fix not restoring ISO buffer count on disconnect
  Bluetooth: L2CAP: Fix memory leak in vhci_write
  Bluetooth: L2CAP: fix use-after-free in l2cap_conn_del()
  Bluetooth: virtio_bt: Use skb_put to set length
  Bluetooth: hci_conn: Fix CIS connection dst_type handling
  Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu
  netfilter: ipset: enforce documented limit to prevent allocating huge memory
  isdn: mISDN: netjet: fix wrong check of device registration
  ...

Pull powerpc fixes from Michael Ellerman:

 - Fix an endian thinko in the asm-generic compat_arg_u64() which led to
   syscall arguments being swapped for some compat syscalls.

 - Fix syscall wrapper handling of syscalls with 64-bit arguments on
   32-bit kernels, which led to syscall arguments being misplaced.

 - A build fix for amdgpu on Book3E with AltiVec disabled.

Thanks to Andreas Schwab, Christian Zigotzky, and Arnd Bergmann.

* tag 'powerpc-6.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/32: Select ARCH_SPLIT_ARG64
  powerpc/32: fix syscall wrappers with 64-bit arguments
  asm-generic: compat: fix compat_arg_u64() and compat_arg_u64_dual()
  powerpc/64e: Fix amdgpu build on Book3E w/o AltiVec

Daniel Machon says:

====================
Add new PCP and APPTRUST attributes to dcbnl

This patch series adds new extension attributes to dcbnl, to support PCP
prioritization (and thereby hw offloadable pcp-based queue
classification) and per-selector trust and trust order. Additionally,
the microchip sparx5 driver has been dcb-enabled to make use of the new
attributes to offload PCP, DSCP and Default prio to the switch, and
implement trust order of selectors.

For pre-RFC discussion see:
https://lore.kernel.org/netdev/Yv9VO1DYAxNduw6A@DEN-LT-70577/

For RFC series see:
https://lore.kernel.org/netdev/20220915095757.2861822-1-daniel.machon@microchip.com/

In summary: there currently exist no convenient way to offload per-port
PCP-based queue classification to hardware. The DCB subsystem offers
different ways to prioritize through its APP table, but lacks an option
for PCP. Similarly, there is no way to indicate the notion of trust for
APP table selectors. This patch series addresses both topics.

PCP based queue classification:
  - 8021Q standardizes the Priority Code Point table (see 6.9.3 of IEEE
    Std 802.1Q-2018).  This patch series makes it possible, to offload
    the PCP classification to said table.  The new PCP selector is not a
    standard part of the APP managed object, therefore it is
    encapsulated in a new non-std extension attribute.

Selector trust:
  - ASIC's often has the notion of trust DSCP and trust PCP. The new
    attribute makes it possible to specify a trust order of app
    selectors, which drivers can then react on.

DCB-enable sparx5 driver:
 - Now supports offloading of DSCP, PCP and default priority. Only one
   mapping of protocol:priority is allowed. Consecutive mappings of the
   same protocol to some new priority, will overwrite the previous. This
   is to keep a consistent view of the app table and the hardware.
 - Now supports dscp and pcp trust, by use of the introduced
   dcbnl_set/getapptrust ops. Sparx5 supports trust orders: [], [dscp],
   [pcp] and [dscp, pcp]. For now, only DSCP and PCP selectors are
   supported by the driver, everything else is bounced.

Patch #1 introduces a new PCP selector to the APP object, which makes it
possible to encode PCP and DEI in the app triplet and offload it to the
PCP table of the ASIC.

Patch #2 Introduces the new extension attributes
DCB_ATTR_DCB_APP_TRUST_TABLE and DCB_ATTR_DCB_APP_TRUST. Trusted
selectors are passed in the nested DCB_ATTR_DCB_APP_TRUST_TABLE
attribute, and assembled into an array of selectors:

  u8 selectors[256];

where lower indexes has higher precedence.  In the array, selectors are
stored consecutively, starting from index zero. With a maximum number of
256 unique selectors, the list has the same maximum size.

Patch #3 Sets up the dcbnl ops hook, and adds support for offloading pcp
app entries, to the PCP table of the switch.

Patch #4 Makes use of the dcbnl_set/getapptrust ops, to set a per-port
trust order.

Patch #5 Adds support for offloading dscp app entries to the DSCP table
of the switch.

Patch #6 Adds support for offloading default prio app entries to the
switch.

====================

Link: https://lore.kernel.org/r/20221101094834.2726202-1-daniel.machon@microchip.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Add support for offloading default prio {ETHERTYPE, 0, prio}.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Add support for offloading dscp app entries. Dscp values are global for
all ports on the sparx5 switch. Therefore, we replicate each dscp app
entry per-port.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Make use of set/getapptrust() to implement per-selector trust and trust
order.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Add new registers and functions to support offload of pcp app entries.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>