With support from the master key option in the previous commit, it
becomes easy to make frequent updates/exchanges of session keys between
authenticated cluster nodes.
Basically, there are two situations where the key exchange will take in
place:

- When a new node joins the cluster (with the master key), it will need
  to get its peer's TX key, so that be able to decrypt further messages
  from that peer.

- When a new session key is generated (by either user manual setting or
  later automatic rekeying feature), the key will be distributed to all
  peer nodes in the cluster.

A key to be exchanged is encapsulated in the data part of a 'MSG_CRYPTO
/KEY_DISTR_MSG' TIPC v2 message, then xmit-ed as usual and encrypted by
using the master key before sending out. Upon receipt of the message it
will be decrypted in the same way as regular messages, then attached as
the sender's RX key in the receiver node.

In this way, the key exchange is reliable by the link layer, as well as
security, integrity and authenticity by the crypto layer.

Also, the forward security will be easily achieved by user changing the
master key actively but this should not be required very frequently.

The key exchange feature is independent on the presence of a master key
Note however that the master key still is needed for new nodes to be
able to join the cluster. It is also optional, and can be turned off/on
via the sysfs: 'net/tipc/key_exchange_enabled' [default 1: enabled].

Backward compatibility is guaranteed because for nodes that do not have
master key support, key exchange using master key ie. tx_key = 0 if any
will be shortly discarded at the message validation step. In other
words, the key exchange feature will be automatically disabled to those
nodes.

v2: fix the "implicit declaration of function 'tipc_crypto_key_flush'"
error in node.c. The function only exists when built with the TIPC
"CONFIG_TIPC_CRYPTO" option.

v3: use 'info->extack' for a message emitted due to netlink operations
instead (- David's comment).
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

In addition to the supported cluster & per-node encryption keys for the
en/decryption of TIPC messages, we now introduce one option for user to
set a cluster key as 'master key', which is simply a symmetric key like
the former but has a longer life cycle. It has two purposes:

- Authentication of new member nodes in the cluster. New nodes, having
  no knowledge of current session keys in the cluster will still be
  able to join the cluster as long as they know the master key. This is
  because all neighbor discovery (LINK_CONFIG) messages must be
  encrypted with this key.

- Encryption of session encryption keys during automatic exchange and
  update of those.This is a feature we will introduce in a later commit
  in this series.

We insert the new key into the currently unused slot 0 in the key array
and start using it immediately once the user has set it.
After joining, a node only knowing the master key should be fully
communicable to existing nodes in the cluster, although those nodes may
have their own session keys activated (i.e. not the master one). To
support this, we define a 'grace period', starting from the time a node
itself reports having no RX keys, so the existing nodes will use the
master key for encryption instead. The grace period can be extended but
will automatically stop after e.g. 5 seconds without a new report. This
is also the basis for later key exchanging feature as the new node will
be impossible to decrypt anything without the support from master key.

For user to set a master key, we define a new netlink flag -
'TIPC_NLA_NODE_KEY_MASTER', so it can be added to the current 'set key'
netlink command to specify the setting key to be a master key.

Above all, the traditional cluster/per-node key mechanism is guaranteed
to work when user comes not to use this master key option. This is also
compatible to legacy nodes without the feature supported.

Even this master key can be updated without any interruption of cluster
connectivity but is so is needed, this has to be coordinated and set by
the user.
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

We reduce the lasting time for a pending TX key to be active as well as
for a passive RX key to be freed which generally helps speed up the key
switching. It is not expected to be too fast but should not be too slow
either. Also the key handling logic is simplified that a pending RX key
will be removed automatically if it is found not working after a number
of times; the probing for a pending TX key is now carried on a specific
message user ('LINK_PROTOCOL' or 'LINK_CONFIG') which is more efficient
than using a timer on broadcast messages, the timer is reserved for use
later as needed.

The kernel logs or 'pr***()' are now made as clear as possible to user.
Some prints are added, removed or changed to the debug-level. The
'TIPC_CRYPTO_DEBUG' definition is removed, and the 'pr_debug()' is used
instead which will be much helpful in runtime.

Besides we also optimize the code in some other places as a preparation
for later commits.

v2: silent more kernel logs, also use 'info->extack' for a message
emitted due to netlink operations instead (- David's comments).
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

Shannon Nelson says:

====================
ionic: add devlink dev flash support

Add support for using devlink's dev flash facility to update the
firmware on an ionic device, and add a new timeout parameter to the
devlink flash netlink message.

For long-running flash commands, we add a timeout element to the dev
flash notify message in order for a userland utility to display a timeout
deadline to the user.  This allows the userland utility to display a
count down to the user when a firmware update action is otherwise going
to go for ahile without any updates.  An example use is added to the
netdevsim module.

The ionic driver uses this timeout element in its new flash function.
The driver uses a simple model of pushing the firmware file to the NIC,
asking the NIC to unpack and install the file into the device, and then
selecting it for the next boot.  If any of these steps fail, the whole
transaction is failed.  A couple of the steps can take a long time,
so we use the timeout status message rather than faking it with bogus
done/total messages.

The driver doesn't currently support doing these steps individually.
In the future we want to be able to list the FW that is installed and
selectable but we don't yet have the API to fully support that.

v5: pulled the cmd field back out of the new params struct
    changed netdevsim example message to "Flash select"

v4: Added a new devlink status notify message for showing timeout
    information, and modified the ionic fw update to use it for its long
    running firmware commands.

v3: Changed long dev_cmd timeout on status check calls to a loop around
    calls with a normal timeout, which allows for more intermediate log
    messaging when in a long wait, and for letting other threads run
    dev_cmds if waiting.

v2: Changed "Activate" to "Select" in status messages.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for firmware update through the devlink interface.
This update copies the firmware object into the device, asks
the current firmware to install it, then asks the firmware to
select the new firmware for the next boot-up.

The install and select steps are launched as asynchronous
requests, which are then followed up with status request
commands.  These status request commands will be answered with
an EAGAIN return value and will try again until the request
has completed or reached the timeout specified.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the rest of the firmware api bits needed to support the
driver running a firmware update.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a simple devlink flash timeout message to exercise
the message mechanism.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

The dev flash status notify function parameter lists are getting
rather long, so add a struct to be filled and passed rather than
continuously changing the function signatures.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a timeout element to the DEVLINK_CMD_FLASH_UPDATE_STATUS
netlink message for use by a userland utility to show that
a particular firmware flash activity may take a long but
bounded time to finish.  Also add a handy helper for drivers
to make use of the new timeout value.

UI usage hints:
 - if non-zero, add timeout display to the end of the status line
 	[component] status_msg  ( Xm Ys : Am Bs )
     using the timeout value for Am Bs and updating the Xm Ys
     every second
 - if the timeout expires while awaiting the next update,
   display something like
 	[component] status_msg  ( timeout reached : Am Bs )
 - if new status notify messages are received, remove
   the timeout and start over
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The combination of aca_free_rcu, introduced in commit 2384d025
("net/ipv6: Add anycast addresses to a global hashtable"), and
fib6_info_destroy_rcu, introduced in commit 9b0a8da8 ("net/ipv6:
respect rcu grace period before freeing fib6_info"), can result in
an extra rcu grace period being needed when deleting an interface,
with the result that netdev_wait_allrefs ends up hitting the msleep(250),
which is considerably longer than the required grace period.
This can result in long delays when deleting a large number of interfaces,
and it can be observed with this script:

ns=dummy-ns
NIFS=100

ip netns add $ns
ip netns exec $ns ip link set lo up
ip netns exec $ns sysctl net.ipv6.conf.default.disable_ipv6=0
ip netns exec $ns sysctl net.ipv6.conf.default.forwarding=1

for ((i=0; i<$NIFS; i++))
do
        if=eth$i
        ip netns exec $ns ip link add $if type dummy
        ip netns exec $ns ip link set $if up
        ip netns exec $ns ip -6 addr add 2021:$i::1/120 dev $if
done

for ((i=0; i<$NIFS; i++))
do
        if=eth$i
        ip netns exec $ns ip link del $if
done

ip netns del $ns

Instead of using a fixed msleep(250), this patch tries an extra
rcu_barrier() followed by an exponential backoff.

Time with this patch on a 5.4 kernel:

real	0m7.704s
user	0m0.385s
sys	0m1.230s

Time without this patch:

real    0m31.522s
user    0m0.438s
sys     0m1.156s

v2: use exponential backoff instead of trying to wake up
    netdev_wait_allrefs.
v3: preserve reverse christmas tree ordering of local variables
v4: try an extra rcu_barrier before the backoff, plus some
    cosmetic changes.
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Christoph reported an infinite loop in the subflow receive path
under stress condition.

If there are multiple subflows, each of them using a large send
buffer, the delta between the sequence number used by
MPTCP-level retransmission can and the current msk->ack_seq
can be greater than MAX_INT.

In the above scenario, when calling mptcp_subflow_discard_data(),
such delta will be truncated to int, and could result in a negative
number: no bytes will be dropped, and subflow_check_data_avail()
will try again to process the same packet, looping forever.

This change addresses the issue by expanding the 'limit' size to 64
bits, so that overflows are not possible anymore.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/87
Fixes: 6719331c ("mptcp: trigger msk processing even for OoO data")
Reported-and-tested-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If smc_listen_rmda_finish() returns with an error, the storage
addressed by 'buf' is freed a second time.
Consolidate freeing under a common label and jump to that label.

Fixes: 6bb14e48 ("net/smc: dynamic allocation of CLC proposal buffer")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

>> ld.lld: error: undefined symbol: net_dim_get_rx_moderation
   >>> referenced by ionic_lif.c:52 (drivers/net/ethernet/pensando/ionic/ionic_lif.c:52)
   >>> net/ethernet/pensando/ionic/ionic_lif.o:(ionic_dim_work) in archive drivers/built-in.a

>> ld.lld: error: undefined symbol: net_dim
   >>> referenced by ionic_txrx.c:456 (drivers/net/ethernet/pensando/ionic/ionic_txrx.c:456)
   >>> net/ethernet/pensando/ionic/ionic_txrx.o:(ionic_dim_update) in archive drivers/built-in.a

v2: removed sketchy dashes in commit message

Fixes: 04a83459 ("ionic: dynamic interrupt moderation")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

We removed the misleading comments from struct rtnl_link_stats64
when we added proper kdoc. struct rtnl_link_stats has the same
inline comments, so remove them, too.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This driver makes use of devm_mdiobus_alloc_size. To ensure this is
available select MDIO_DEVRES which provides it.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: David S. Miller <davem@davemloft.net>

IPPROTO_IP (0) is not valid for raw sockets. Default the protocol for
raw sockets to IPPROTO_RAW if the protocol has not been set via the -P
option.
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Ido Schimmel says:

====================
mlxsw: Support dcbnl_setbuffer, dcbnl_getbuffer

Petr says:

On Spectrum, port buffers, also called port headroom, is where packets are
stored while they are parsed and the forwarding decision is being made. For
lossless traffic flows, in case shared buffer admission is not allowed,
headroom is also where to put the extra traffic received before the sent
PAUSE takes effect.

Linux supports two DCB interfaces related to the headroom: dcbnl_setbuffer
for configuration, and dcbnl_getbuffer for inspection. This patch set
implements them.

With dcbnl_setbuffer in place, there will be two sources of authority over
the ingress configuration: the DCB ETS hook, because ETS configuration is
mirrored to ingress, and the DCB setbuffer hook. mlxsw is in a similar
situation on the egress side, where there are two sources of the ETS
configuration: the DCB ETS hook, and the TC qdisc hooks. This is a
non-intuitive situation, because the way the ASIC ends up being configured
depends not only on the actual configured bits, but also on the order in
which they were configured.

To prevent these issues on the ingress side, two configuration modes will
exist: DCB mode and TC mode. DCB ETS will keep getting projected to ingress
in the (default) DCB mode. When a qdisc is installed on a port, it will be
switched to the TC mode, the ingress configuration will be done through the
dcbnl_setbuffer callback. The reason is that the dcbnl_setbuffer hook is
not standardized and supported by lldpad. Projecting DCB ETS configuration
to ingress is a reasonable heuristic to configure ingress especially when
PFC is in effect.

In patch #1, the toggle between the DCB and TC modes of headroom
configuration, described above, is introduced.

Patch #2 implements dcbnl_getbuffer and dcbnl_setbuffer. dcbnl_getbuffer
can be always used to determine the current port headroom configuration.
dcbnl_setbuffer is only permitted in the TC mode.

In patch #3, make the qdisc module toggle the headroom mode from DCB to TC
and back, depending on whether there is an offloaded qdisc on the port.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

There are two interfaces to configure ETS: qdiscs and DCB. Historically,
DCB ETS configuration was projected to ingress as well, and configured port
buffers. Qdisc was not.

Keep qdiscs behaving this way, and if an offloaded qdisc is configured on a
port, move this port's headroom to a manual mode, thus allowing
configuration of port buffers through dcbnl_setbuffer.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add dcbnl_setbuffer, which bounces requests if a headroom is in DCB mode.
Implement dcbnl_getbuffer such that it can always be used to determine
port-buffer configuration, regardless of headroom mode.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There are two interfaces to configure ETS: qdiscs and DCB. Historically,
DCB ETS configuration was projected to ingress as well, and configured port
buffers. Qdisc was not.

So as not to break clients that today use DCB ETS and PFC and rely on
getting a reasonable ingress buffer priomap, keep the ETS mirroring in
effect.

Since qdiscs have not done this mirroring historically, it is reasonable
not to introduce it, but rather permit manual ingress configuration through
dcbnl_setbuffer only in the qdisc mode.

This will require a toggle to indicate whether buffer sizes should be
autocomputed or taken from dcbnl_setbuffer, and likewise for priomaps.
Introduce such and initialize it, and guard port buffer size configuration
as appropriate. The toggle is currently left in the DCB position. In a
following patch, qdisc code will switch it.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It's hard to read the code without spaces around '&',
for better reading, add spaces around '&'.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is no callers in tree, so can remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fixes coccicheck warnig:
net/mptcp/protocol.c:164:11-18: WARNING: Unsigned expression compared with zero: max_seq > 0

Fixes: ab174ad8 ("mptcp: move ooo skbs into msk out of order queue")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge branch 'net-marvell-prestera-Add-Switchdev-driver-for-Prestera-family-ASIC-device-98DX3255-AC3x'

Vadym Kochan says:

====================
net: marvell: prestera: Add Switchdev driver for Prestera family ASIC device 98DX3255 (AC3x)

Marvell Prestera 98DX3255 integrates up to 24 ports of 1GbE with 8
ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
wireless SMB deployment.

Prestera Switchdev is a firmware based driver that operates via PCI bus.  The
current implementation supports only boards designed for the Marvell Switchdev
solution and requires special firmware.

This driver implementation includes only L1, basic L2 support, and RX/TX.

The core Prestera switching logic is implemented in prestera_main.c, there is
an intermediate hw layer between core logic and firmware. It is
implemented in prestera_hw.c, the purpose of it is to encapsulate hw
related logic, in future there is a plan to support more devices with
different HW related configurations.

The following Switchdev features are supported:

    - VLAN-aware bridge offloading
    - VLAN-unaware bridge offloading
    - FDB offloading (learning, ageing)
    - Switchport configuration

The original firmware image is uploaded to the linux-firmware repository.

PATCH v9:
    1) Replace read_poll_timeout_atomic() by original 'do {} while()' loop
       because it works much better than read_poll_timeout_atomic()
       considering the TX rate. Also it fixes warning reported on v8.

    2) Use ENOENT instead of EEXIST when item is not found in few
       places - prestera_hw.c and prestera_rxtx.c

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices

PATCH v8:
    1) Put license in one line.

    2) Sort includes.

    3) Add missing comma for last enum member

    4) Return original error code from last called func
       in places where instead other error code was used.

    5) Add comma for last member in initialized struct in prestera_hw.c

    6) Do not initialize 'int err = 0' where it is not needed.

    7) Simplify device-tree "marvell,prestera" node parsing by removing not
       needed checking on 'np == NULL'.

    8) Use u32p_replace_bits() instead of open-coded ((word & ~mask) | val)

    9) Use dev_warn_ratelimited() instead of pr_warn_ratelimited to indicate the device
        instance in prestera_rxtx.c

    10) Simplify circular buffer list creation in prestera_sdma_{rx,tx}_init() by using
        do { } while (prev != tail) construction.

    11) Use MSEC_PER_SEC instead of hard-coded 1000.

    12) Use traditional error handling pattern:

       err = F();
       if (err)
           return err;

    13) Use ether_addr_copy() instead of memcpy() for mac FDB copying in prestera_hw.c

    14) Drop swdev->ageing_time member which is not used.

    15) Fix ageing macro to be in ms instead of seconds.

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
	[2] net: marvell: prestera: Add PCI interface support
        [3] net: marvell: prestera: Add basic devlink support
	[4] net: marvell: prestera: Add ethtool interface support
	[5] net: marvell: prestera: Add Switchdev driver implementation

PATCH v7:
    1) Use ether_addr_copy() in prestera_main.c:prestera_port_set_mac_address()
       instead of memcpy().

    2) Removed not needed device's DMA address range check on
       dma_pool_alloc() in prestera_rxtx.c:prestera_sdma_buf_init(),
       this should be handled by dma_xxx() API considerig device's DMA mask.

    3) Removed not needed device's DMA address range check on
       dma_map_single() in prestera_rxtx.c:prestera_sdma_rx_skb_alloc(),
       this should be handled by dma_xxx() API considerig device's DMA mask.

    4) Add comment about port mac address limitation in the code where
       it is used and checked - prestera_main.c:

           - prestera_is_valid_mac_addr()
           - prestera_port_create()

    5) Add missing destroy_workqueue(swdev_wq) in prestera_switchdev.c:prestera_switchdev_init()
       on error path handling.

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
        [5] net: marvell: prestera: Add Switchdev driver implementation

PATCH v6:
    1) Use rwlock to protect port list on create/delete stages. The list
       is mostly readable by fw event handler or packets receiver, but
       updated only on create/delete port which are performed on switch init/fini
       stages.

    2) Remove not needed variable initialization in prestera_dsa.c:prestera_dsa_parse()

    3) Get rid of bounce buffer used by tx handler in prestera_rxtx.c,
       the bounce buffer should be handled by dma_xxx API via swiotlb.

    4) Fix PRESTERA_SDMA_RX_DESC_PKT_LEN macro by using correct GENMASK(13, 0) in prestera_rxtx.c

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices

PATCH v5:
    0) add Co-developed tags for people who was involved in development.

    1) Make SPDX license as separate comment

    2) Change 'u8 *' -> 'void *', It allows to avoid not-needed u8* casting.

    3) Remove "," in terminated enum's.

    4) Use GENMASK(end, start) where it is applicable in.

    5) Remove not-needed 'u8 *' casting.

    6) Apply common error-check pattern

    7) Use ether_addr_copy instead of memcpy

    8) Use define for maximum MAC address range (255)

    9) Simplify prestera_port_state_set() in prestera_main.c by
       using separate if-blocks for state setting:

        if (is_up) {
        ...
        } else {
        ...
        }

      which makes logic more understandable.

    10) Simplify sdma tx wait logic when checking/updating tx_ring->burst.

    11) Remove not-needed packed & aligned attributes

    12) Use USEC_PER_MSEC as multiplier when converting ms -> usec on calling
        readl_poll_timeout.

    13) Simplified some error path handling by simple return error code in.

    14) Remove not-needed err assignment in.

    15) Use dev_err() in prestera_devlink_register(...).

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
	[2] net: marvell: prestera: Add PCI interface support
        [3] net: marvell: prestera: Add basic devlink support
	[4] net: marvell: prestera: Add ethtool interface support
	[5] net: marvell: prestera: Add Switchdev driver implementation

PATCH v4:
    1) Use prestera_ prefix in netdev_ops variable.

    2) Kconfig: use 'default PRESTERA' build type for CONFIG_PRESTERA_PCI to be
       synced by default with prestera core module.

    3) Use memcpy_xxio helpers in prestera_pci.c for IO buffer copying.

    4) Generate fw image path via snprintf() instead of macroses.

    5) Use pcim_ helpers in prestera_pci.c which simplified the
       probe/remove logic.

    6) Removed not needed initializations of variables which are used in
       readl_poll_xxx() helpers.

    7) Fixed few grammar mistakes in patch[2] description.

    8) Export only prestera_ethtool_ops struct instead of each
       ethtool handler.

    9) Add check for prestera_dev_check() in switchdev event handling to
       make sure there is no wrong topology.

    Patches updated:
        [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
	[2] net: marvell: prestera: Add PCI interface support
	[4] net: marvell: prestera: Add ethtool interface support
	[5] net: marvell: prestera: Add Switchdev driver implementation

PATCH v3:
    1) Simplify __be32 type casting in prestera_dsa.c

    2) Added per-patch changelog under "---" line.

PATCH v2:
    1) Use devlink_port_type_clear()

    2) Add _MS prefix to timeout defines.

    3) Remove not-needed packed attribute from the firmware ipc structs,
       also the firmware image needs to be uploaded too (will do it soon).

    4) Introduce prestera_hw_switch_fini(), to be mirrored with init and
       do simple validation if the event handlers are unregistered.

    5) Use kfree_rcu() for event handler unregistering.

    6) Get rid of rcu-list usage when dealing with ports, not needed for
       now.

    7) Little spelling corrections in the error/info messages.

    8) Make pci probe & remove logic mirrored.

    9) Get rid of ETH_FCS_LEN in headroom setting, not needed.

PATCH:
    1) Fixed W=1 warnings

    2) Renamed PCI driver name to be more generic "Prestera DX" because
       there will be more devices supported.

    3) Changed firmware image dir path: marvell/ -> mrvl/prestera/
       to be aligned with location in linux-firmware.git (if such
       will be accepted).

RFC v3:
    1) Fix prestera prefix in prestera_rxtx.c

    2) Protect concurrent access from multiple ports on multiple CPU system
       on tx path by spinlock in prestera_rxtx.c

    3) Try to get base mac address from device-tree, otherwise use a random generated one.

    4) Move ethtool interface support into separate prestera_ethtool.c file.

    5) Add basic devlink support and get rid of physical port naming ops.

    6) Add STP support in Switchdev driver.

    7) Removed MODULE_AUTHOR

    8) Renamed prestera.c -> prestera_main.c, and kernel module to
       prestera.ko

RFC v2:
    1) Use "pestera_" prefix in struct's and functions instead of mvsw_pr_

    2) Original series split into additional patches for Switchdev ethtool support.

    3) Use major and minor firmware version numbers in the firmware image filename.

    4) Removed not needed prints.

    5) Use iopoll API for waiting on register's value in prestera_pci.c

    6) Use standart approach for describing PCI ID matching section instead of using
       custom wrappers in prestera_pci.c

    7) Add RX/TX support in prestera_rxtx.c.

    8) Rewritten prestera_switchdev.c with following changes:
       - handle netdev events from prestera.c

       - use struct prestera_bridge for bridge objects, and get rid of
         struct prestera_bridge_device which may confuse.

       - use refcount_t

    9) Get rid of macro usage for sending fw requests in prestera_hw.c

    10) Add base_mac setting as module parameter. base_mac is required for
        generation default port's mac.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add brief description how to configure base mac address binding in
device-tree.

Describe requirement for the PCI port which is connected to the ASIC, to
allow access to the firmware related registers.
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

The following features are supported:

    - VLAN-aware bridge offloading
    - VLAN-unaware bridge offloading
    - FDB offloading (learning, ageing)
    - Switchport configuration

Currently there are some limitations like:

    - Only 1 VLAN-aware bridge instance supported
    - FDB ageing timeout parameter is set globally per device
Co-developed-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Co-developed-by: Serhiy Pshyk <serhiy.pshyk@plvision.eu>
Signed-off-by: Serhiy Pshyk <serhiy.pshyk@plvision.eu>
Co-developed-by: Taras Chornyi <taras.chornyi@plvision.eu>
Signed-off-by: Taras Chornyi <taras.chornyi@plvision.eu>
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

The ethtool API provides support for the configuration of the following
features: speed and duplex, auto-negotiation, MDI-x, forward error
correction, port media type. The API also provides information about the
port status, hardware and software statistic. The following limitation
exists:

    - port media type should be configured before speed setting
    - ethtool -m option is not supported
    - ethtool -p option is not supported
    - ethtool -r option is supported for RJ45 port only
    - the following combination of parameters is not supported:

          ethtool -s sw1pX port XX autoneg on

    - forward error correction feature is supported only on SFP ports, 10G
      speed

    - auto-negotiation and MDI-x features are not supported on
      Copper-to-Fiber SFP module
Co-developed-by: Andrii Savka <andrii.savka@plvision.eu>
Signed-off-by: Andrii Savka <andrii.savka@plvision.eu>
Co-developed-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add very basic support for devlink interface:

    - driver name
    - fw version
    - devlink ports
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add PCI interface driver for Prestera Switch ASICs family devices, which
provides:

    - Firmware loading mechanism
    - Requests & events handling to/from the firmware
    - Access to the firmware on the bus level

The firmware has to be loaded each time the device is reset. The driver
is loading it from:

    /lib/firmware/mrvl/prestera/mvsw_prestera_fw-v{MAJOR}.{MINOR}.img

The full firmware image version is located within the internal header
and consists of 3 numbers - MAJOR.MINOR.PATCH. Additionally, driver has
hard-coded minimum supported firmware version which it can work with:

    MAJOR - reflects the support on ABI level between driver and loaded
            firmware, this number should be the same for driver and loaded
            firmware.

    MINOR - this is the minimum supported version between driver and the
            firmware.

    PATCH - indicates only fixes, firmware ABI is not changed.

Firmware image file name contains only MAJOR and MINOR numbers to make
driver be compatible with any PATCH version.
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

Marvell Prestera 98DX326x integrates up to 24 ports of 1GbE with 8
ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
wireless SMB deployment.

The current implementation supports only boards designed for the Marvell
Switchdev solution and requires special firmware.

The core Prestera switching logic is implemented in prestera_main.c,
there is an intermediate hw layer between core logic and firmware. It is
implemented in prestera_hw.c, the purpose of it is to encapsulate hw
related logic, in future there is a plan to support more devices with
different HW related configurations.

This patch contains only basic switch initialization and RX/TX support
over SDMA mechanism.

Currently supported devices have DMA access range <= 32bit and require
ZONE_DMA to be enabled, for such cases SDMA driver checks if the skb
allocated in proper range supported by the Prestera device.

Also meanwhile there is no TX interrupt support in current firmware
version so recycling work is scheduled on each xmit.

Port's mac address is generated from the switch base mac which may be
provided via device-tree (static one or as nvme cell), or randomly
generated. This is required by the firmware.
Co-developed-by: Andrii Savka <andrii.savka@plvision.eu>
Signed-off-by: Andrii Savka <andrii.savka@plvision.eu>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Co-developed-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Co-developed-by: Serhiy Pshyk <serhiy.pshyk@plvision.eu>
Signed-off-by: Serhiy Pshyk <serhiy.pshyk@plvision.eu>
Co-developed-by: Taras Chornyi <taras.chornyi@plvision.eu>
Signed-off-by: Taras Chornyi <taras.chornyi@plvision.eu>
Co-developed-by: Volodymyr Mytnyk <volodymyr.mytnyk@plvision.eu>
Signed-off-by: Volodymyr Mytnyk <volodymyr.mytnyk@plvision.eu>
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

It is never used, so can remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It is not used since commit a09ceb0e ("sched: remove qdisc->drop")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In case of errors, this message was printed:

  (...)
  # read: Resource temporarily unavailable
  #  client exit code 0, server 3
  # \nnetns ns1-0-BJlt5D socket stat for 10003:
  (...)

Obviously, the idea was to add a new line before the socket stat and not
print "\nnetns".

Fixes: b08fbf24 ("selftests: add test-cases for MPTCP MP_JOIN")
Fixes: 048d19d4 ("mptcp: add basic kselftest for mptcp")
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1. Change all "dev->hard_header" to "dev->header_ops"

2. On receiving incoming frames when header_ops == NULL:

The comment only says what is wrong, but doesn't say what is right.
This patch changes the comment to make it clear what is right.

3. On transmitting and receiving outgoing frames when header_ops == NULL:

The comment explains that the LL header will be later added by the driver.

However, I think it's better to simply say that the LL header is invisible
to us. This phrasing is better from a software engineering perspective,
because this makes it clear that what happens in the driver should be
hidden from us and we should not care about what happens internally in the
driver.

4. On resuming the LL header (for RAW frames) when header_ops == NULL:

The comment says we are "unlikely" to restore the LL header.

However, we should say that we are "unable" to restore it.
It's not possible (rather than not likely) to restore it, because:

1) There is no way for us to restore because the LL header internally
processed by the driver should be invisible to us.

2) In function packet_rcv and tpacket_rcv, the code only tries to restore
the LL header when header_ops != NULL.

Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Huazhong Tan says:

====================
net: hns3: updates for -next

There are some optimizations related to IO path.

Change since V1:
- fixes a unsuitable handling in hns3_lb_clear_tx_ring() of #6 which
  pointed out by Saeed Mahameed.

previous version:
V1: https://patchwork.ozlabs.org/project/netdev/cover/1600085217-26245-1-git-send-email-tanhuazhong@huawei.com/
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Use napi_consume_skb() to batch consuming skb when cleaning
tx desc in NAPI polling.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

writel() can be used to order I/O vs memory by default when
writing portable drivers. Use writel() to replace wmb() +
writel_relaxed(), and writel() is dma_wmb() + writel_relaxed()
for ARM64, so there is an optimization here because dma_wmb()
is a lighter barrier than wmb().
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently HNS3_RING_RX_RING_FBDNUM_REG register is read to determine
how many rx desc can be cleaned. To avoid the register read operation
in the critical data path, use the valid bit in the rx desc to determine
if a specific rx desc can be cleaned.

The hns3 driver clear valid bit in the rx desc before notifying the
rx desc to the hw, and hw will only set the valid bit of the rx desc
after corresponding buffer is filled with packet data and other field
in the rx desc is set accordingly.

Add hns3_rx_ring_move_fw() function to clear the valid bit in the rx
desc before moving rx ring's next_to_clean forward to avoid double
cleaning a rx desc, also add a dma_rmb() barrier in hns3_handle_rx_bd()
to make sure valid bit is set before reading other field in the rx desc.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>