As reported by a comment in the c_can_start_xmit() this was not a FIFO.
C/D_CAN controller sends out the buffers prioritized so that the lowest
buffer number wins.

What did c_can_start_xmit() do if head was less tail in the tx ring ? It
waited until all the frames queued in the FIFO was actually transmitted
by the controller before accepting a new CAN frame to transmit, even if
the FIFO was not full, to ensure that the messages were transmitted in
the order in which they were loaded.

By storing the frames in the FIFO without requiring its transmission, we
will be able to use the full size of the FIFO even in cases such as the
one described above. The transmission interrupt will trigger their
transmission only when all the messages previously loaded but stored in
less priority positions of the buffers have been transmitted.

Link: https://lore.kernel.org/r/20210807130800.5246-5-dariobin@libero.itSuggested-by: Gianluca Falavigna <gianluca.falavigna@inwind.it>
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The algorithm is already used successfully by other CAN drivers
(e.g. mcp251xfd). Its implementation was kindly suggested to me by
Marc Kleine-Budde following a patch I had previously submitted. You can
find every detail at https://lore.kernel.org/patchwork/patch/1422929/.

The idea is that after this patch, it will be easier to patch the driver
to use the message object memory as a true FIFO.

Link: https://lore.kernel.org/r/20210807130800.5246-4-dariobin@libero.itSuggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The c_can_poll() handles RX/TX events unconditionally. It may therefore
happen that c_can_do_tx() is called unnecessarily because the interrupt
was triggered by the reception of a frame. In these cases, we avoid to
execute unnecessary statements and exit immediately.

Link: https://lore.kernel.org/r/20210807130800.5246-3-dariobin@libero.itSigned-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

It references the clock but it is never used. So let's remove it.

Link: https://lore.kernel.org/r/20210807130800.5246-2-dariobin@libero.itSigned-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The C_CAN/D_CAN cores implement 2 interfaces to manage the message
objects. To avoid concurrency and the need for locking one interface
is used in the TX path (IF_TX). While the other one, named IF_RX is
used from NAPI context only. As this interface is not only used to
manage RX, but also TX message objects, this patch renames IF_RX to
IF_NAPI.

Link: https://lore.kernel.org/r/20210809080608.171545-1-mkl@pengutronix.de
Cc: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

This patch fixes a typo in the comment in c_can_do_tx().

Fixes: eddf6711 ("can: c_can: add a comment about IF_RX interface's use")
Link: https://lore.kernel.org/r/20210806105127.103302-1-mkl@pengutronix.de
Cc: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Convert the Bosch C_CAN/D_CAN controller device tree binding
documentation to json-schema.

Document missing properties.
Remove "ti,hwmods" as it is no longer used in TI dts.
Make "clocks" required as it is used in all dts.
Update the examples.

Link: https://lore.kernel.org/r/20210805192750.9051-1-dariobin@libero.itSigned-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Give FIFO writes the same treatment as reads to avoid fixed costs of
individual transfers on a slow bus (e.g., tcan4x5x).

Link: https://lore.kernel.org/r/20210817050853.14875-4-matt@bitbashing.ioSigned-off-by: Matt Kline <matt@bitbashing.io>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

On peripherals communicating over a relatively slow SPI line
(e.g. tcan4x5x), individual transfers have high fixed costs.
This causes the driver to spend most of its time waiting between
transfers and severely limits throughput.

Reduce these overheads by reading more than one word at a time.
Writing could get a similar treatment in follow-on commits.

Link: https://lore.kernel.org/r/20210817050853.14875-3-matt@bitbashing.ioSigned-off-by: Matt Kline <matt@bitbashing.io>
[mkl: remove __packed from struct id_and_dlc]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

If FIFO reads or writes fail due to the underlying regmap (e.g., SPI)
I/O, propagate that up to the m_can driver, log an error, and disable
interrupts, similar to the mcp251xfd driver.

While reworking the FIFO functions to add this error handling,
add support for bulk reads and writes of multiple registers.

Link: https://lore.kernel.org/r/20210817050853.14875-2-matt@bitbashing.ioSigned-off-by: Matt Kline <matt@bitbashing.io>
[mkl: re-wrap long lines, remove WARN_ON, convert to netdev block comments]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

This patch fixes the commenting style in the m_can driver.

Fixes: 1be37d3b ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")
Fixes: df06fd67 ("can: m_can: m_can_chip_config(): enable and configure internal timestamps")
Link: https://lore.kernel.org/r/20210819111703.599686-2-mkl@pengutronix.de
Cc: Chandrasekar Ramakrishnan <rcsekar@samsung.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

This patch removes a stray empty line in the cdev_to_priv() function.

Fixes: ac33ffd3 ("can: m_can: let m_can_class_allocate_dev() allocate driver specific private data")
Link: https://lore.kernel.org/r/20210819111703.599686-1-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

CANFD block on RZ/G2L SoC is almost identical to one found on
R-Car Gen3 SoC's. On RZ/G2L SoC interrupt sources for each channel
are split into different sources and the IP doesn't divide (1/2)
CANFD clock within the IP.

This patch adds compatible string for RZ/G2L family and splits
the irq handlers to accommodate both RZ/G2L and R-Car Gen3 SoC's.

Link: https://lore.kernel.org/r/20210727133022.634-3-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
[mkl: fixed typo: recieve -> receive, thanks Geert]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Add CANFD binding documentation for Renesas RZ/G2L SoC.

Link: https://lore.kernel.org/r/20210727133022.634-2-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

With the patch 07ff4aed ("time/timecounter: Mark 1st argument of
timecounter_cyc2time() as const") some instances of the struct
mcp251xfd_priv can be marked as const. This patch marks these as
const.

Link: https://lore.kernel.org/r/20210813091027.159379-1-mkl@pengutronix.de
Cc: Manivannan Sadhasivam <mani@kernel.org>
Cc: Thomas Kopp <thomas.kopp@microchip.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The documentation of struct es58x_fd_tx_conf_msg explains in details
the different TDC parameters. However, those description are redundant
with the documentation of struct can_tdc.

Remove most of the description.

Also, fixes a typo in the reference to the datasheet (E701 -> E70).

Link: https://lore.kernel.org/r/20210815033248.98111-8-mailhol.vincent@wanadoo.frSigned-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Adding myself (Vincent Mailhol) as a maintainer for the ETAS ES58X
CAN/USB driver.

Link: https://lore.kernel.org/r/20210814093353.74391-1-mailhol.vincent@wanadoo.frSigned-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The sanity checks on the control modes will reject any request related
to an unsupported features, even turning it off.

Example on an interface which does not support CAN-FD:

$ ip link set can0 type can bitrate 500000 fd off
RTNETLINK answers: Operation not supported

This patch lets such command go through (but requests to turn on an
unsupported feature are, of course, still denied).

Link: https://lore.kernel.org/r/20210815033248.98111-2-mailhol.vincent@wanadoo.frSigned-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

For CAN buses to work, a termination resistor has to be present at both
ends of the bus. This resistor is usually 120 Ohms, other values may be
required for special bus topologies.

This patch adds support for a generic GPIO based CAN termination. The
resistor value has to be specified via device tree, and it can only be
attached to or detached from the bus. By default the termination is not
active.

Link: https://lore.kernel.org/r/20210818071232.20585-4-o.rempel@pengutronix.deSigned-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Enable termination-* binding and provide validation example for it.

Link: https://lore.kernel.org/r/20210818071232.20585-3-o.rempel@pengutronix.deSigned-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Some boards provide GPIO controllable termination resistor. Provide
binding to make use of it.

Link: https://lore.kernel.org/r/20210818071232.20585-2-o.rempel@pengutronix.deSigned-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Matthias Fuchs's and Thomas Körper's email addresses aren't valid
anymore. Use the newly created role account instead.

Link: https://lore.kernel.org/r/20210809175843.207864-1-mkl@pengutronix.de
Cc: socketcan@esd.eu
Cc: Stefan Mätje <Stefan.Maetje@esd.eu>
Acked-by: Stefan Mätje <stefan.maetje@esd.eu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The ARRAY_SIZE macro is defined to get an array's size which is
more compact and more formal in linux source. Thus, we can replace
the long sizeof(arr)/sizeof(arr[0]) with the compact ARRAY_SIZE.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20210817121106.44189-1-wangborong@cdjrlc.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Currently, the declaration of fill_imix_distribution() is dependent
on CONFIG_XFRM. This is incorrect.

Move fill_imix_distribution() declaration out of #ifndef CONFIG_XFRM
block.
Signed-off-by: Nick Richardson <richardsonnick@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add gfp_t mask as an input parameter to mem_cgroup_charge_skmem(),
to give more control to the networking stack and enable it to change
memcg charging behavior. In the future, the networking stack may decide
to avoid oom-kills when fallbacks are more appropriate.

One behavior change in mem_cgroup_charge_skmem() by this patch is to
avoid force charging by default and let the caller decide when and if
force charging is needed through the presence or absence of
__GFP_NOFAIL.
Signed-off-by: Wei Wang <weiwan@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

VLAN TCI is a 16 bit field which includes Priority(3 bits),
CFI(1 bit) and VID(12 bits). Currently ntuple filters support
installing rules to steer packets based on VID only.
This patch extends that support such that filters can
be installed for entire VLAN TCI.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 09e856d5 ("vrf: Reset skb conntrack connection on VRF rcv")
fixes the "reverse-DNAT" of an SNAT-ed packet over a VRF.

This patch adds a test for this scenario.
Signed-off-by: Lahav Schlesinger <lschlesinger@drivenets.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is only one caller for ops_free(), so inline it.
Separate net_drop_ns() and net_free(), so the net_free()
can be called directly.
Add free_exit_list() helper function for free net_exit_list.

====================
v2:
 - v1 does not apply, rebase it.
====================
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for tag_sja1105 running on non-sja1105 DSA ports, by making
sure that every time we dereference dp->priv, we check the switch's
dsa_switch_ops (otherwise we access a struct sja1105_port structure that
is in fact something else).

This adds an unconditional build-time dependency between sja1105 being
built as module => tag_sja1105 must also be built as module. This was
there only for PTP before.

Some sane defaults must also take place when not running on sja1105
hardware. These are:

- sja1105_xmit_tpid: the sja1105 driver uses different VLAN protocols
  depending on VLAN awareness and switch revision (when an encapsulated
  VLAN must be sent). Default to 0x8100.

- sja1105_rcv_meta_state_machine: this aggregates PTP frames with their
  metadata timestamp frames. When running on non-sja1105 hardware, don't
  do that and accept all frames unmodified.

- sja1105_defer_xmit: calls sja1105_port_deferred_xmit in sja1105_main.c
  which writes a management route over SPI. When not running on sja1105
  hardware, bypass the SPI write and send the frame as-is.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Bongsu Jeon says:

====================
Update the virtual NCI device driver and add the NCI testcase

This series updates the virtual NCI device driver and NCI selftest code
and add the NCI test case in selftests.

1/8 to use wait queue in virtual device driver.
2/8 to remove the polling code in selftests.
3/8 to fix a typo.
4/8 to fix the next nlattr offset calculation.
5/8 to fix the wrong condition in if statement.
6/8 to add a flag parameter to the Netlink send function.
7/8 to extract the start/stop discovery function.
8/8 to add the NCI testcase in selftests.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the NCI testcase reading T4T Tag that has NFC TEST in plain text.
the virtual device application acts as T4T Tag in this testcase.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

To reuse the start/stop discovery code in other testcase, extract the code.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

To reuse the send_cmd_mt_nla for NLM_F_REQUEST and NLM_F_DUMP flag,
add the flags parameter to the function.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

memcpy should be executed only in case nla_len's value is greater than 0.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

nlattr could have a padding for 4 bytes alignment. So next nla's offset
should be calculated with a padding.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix typo: rep_len -> resp_len
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Because the virtual NCI device uses Wait Queue, the virtual device
application doesn't need to poll the NCI frame.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In previous version, the user level virtual device application that used
this driver should have the polling scheme to read a NCI frame.
To remove this polling scheme, use Wait Queue.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add seq_puts() statement for dev_mcast, make it more readable.
As also, keep vertical alignment for {dev, ptype, dev_mcast} that
under /proc/net.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make all dependent RxRPC kconfig entries be dependent on AF_RXRPC
so that they are presented (indented) after AF_RXRPC instead
of being presented at the same level on indentation.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: linux-afs@lists.infradead.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>