can: rx-offload: add can_rx_offload_get_echo_skb_queue_tail()

Add can_rx_offload_get_echo_skb_queue_tail(). This function addds the
echo skb at the end of rx-offload the queue. This is intended for

can: rx-offload: add can_rx_offload_get_echo_skb_queue_tail()

Add can_rx_offload_get_echo_skb_queue_tail(). This function addds the
echo skb at the end of rx-offload the queue. This is intended for
devices without timestamp support.

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: rename rx_offload_get_echo_skb() -> can_rx_offload_get_echo_skb_queue_timestamp()

Rename the rx_offload_get_echo_skb() function to
can_rx_offload_get_echo_skb_queue_timestamp(), sin

can: rx-offload: rename rx_offload_get_echo_skb() -> can_rx_offload_get_echo_skb_queue_timestamp()

Rename the rx_offload_get_echo_skb() function to
can_rx_offload_get_echo_skb_queue_timestamp(), since it inserts the
echo skb into the rx-offload queue sorted by timestamp.

This is a preparation for adding
can_rx_offload_get_echo_skb_queue_tail(), which adds the echo skb to
the end of the queue. This is intended for devices that do not support
timestamps.

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: rename can_rx_offload_queue_sorted() -> can_rx_offload_queue_timestamp()

This patch renames the function can_rx_offload_queue_sorted() to
can_rx_offload_queue_timestamp(). This bett

can: rx-offload: rename can_rx_offload_queue_sorted() -> can_rx_offload_queue_timestamp()

This patch renames the function can_rx_offload_queue_sorted() to
can_rx_offload_queue_timestamp(). This better describes what the
function does, it adds a newly RX'ed skb to the sorted queue by its
timestamp.

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: can_rx_offload_threaded_irq_finish(): add new function to be called from threaded interrupt

After reading all CAN frames from the controller in the IRQ handler
and storing them into

can: rx-offload: can_rx_offload_threaded_irq_finish(): add new function to be called from threaded interrupt

After reading all CAN frames from the controller in the IRQ handler
and storing them into a skb_queue, the driver calls napi_schedule().
In the napi poll function the skb from the skb_queue are then pushed
into the networking stack.

However if napi_schedule() is called from a threaded IRQ handler this
triggers the following error:

| NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!

To avoid this, create a new rx-offload
function (can_rx_offload_threaded_irq_finish()) with a call to
local_bh_disable()/local_bh_enable() around the napi_schedule() call.

Convert all drivers that call can_rx_offload_irq_finish() from
threaded IRQ context to can_rx_offload_threaded_irq_finish().

Link: https://lore.kernel.org/r/[email protected]
Suggested-by: Daniel Glöckner <[email protected]>
Tested-by: Oleksij Rempel <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: can_rx_offload_irq_finish(): directly call napi_schedule()

Instead of calling can_rx_offload_schedule() call napi_schedule()
directly. As this was the last use of can_rx_offload_sch

can: rx-offload: can_rx_offload_irq_finish(): directly call napi_schedule()

Instead of calling can_rx_offload_schedule() call napi_schedule()
directly. As this was the last use of can_rx_offload_schedule() remove
this helper function.

Link: https://lore.kernel.org/r/[email protected]
Tested-by: Oleksij Rempel <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: add skb queue for use during ISR

Adding a skb to the skb_queue in rx-offload requires to take a lock.

This commit avoids this by adding an unlocked skb queue that is
appended at th

can: rx-offload: add skb queue for use during ISR

Adding a skb to the skb_queue in rx-offload requires to take a lock.

This commit avoids this by adding an unlocked skb queue that is
appended at the end of the ISR. Having one lock at the end of the ISR
should be OK as the HW is empty, not about to overflow.

Link: https://lore.kernel.org/r/[email protected]
Tested-by: Oleksij Rempel <[email protected]>
Co-developed-by: Kurt Van Dijck <[email protected]>
Signed-off-by: Kurt Van Dijck <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: dev: can_rx_offload_get_echo_skb(): extend to return can frame length

In order to implement byte queue limits (bql) in CAN drivers, the length of the
CAN frame needs to be passed into the netwo

can: dev: can_rx_offload_get_echo_skb(): extend to return can frame length

In order to implement byte queue limits (bql) in CAN drivers, the length of the
CAN frame needs to be passed into the networking stack after queueing and after
transmission completion.

To avoid to calculate this length twice, extend can_rx_offload_get_echo_skb()
to return that value. Convert all users of this function, too.

Reviewed-by: Vincent Mailhol <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: can_rx_offload_add_manual(): add new initialization function

This patch adds a new initialization function:
can_rx_offload_add_manual()

It should be used to add support rx-offload

can: rx-offload: can_rx_offload_add_manual(): add new initialization function

This patch adds a new initialization function:
can_rx_offload_add_manual()

It should be used to add support rx-offload to a driver, if the callback
mechanism should not be used. Use e.g. can_rx_offload_queue_sorted() to queue
skbs into rx-offload.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: Prepare for CAN FD support

The skbs for classic CAN and CAN FD frames are allocated with seperate
functions: alloc_can_skb() and alloc_canfd_skb().

In order to support CAN FD frame

can: rx-offload: Prepare for CAN FD support

The skbs for classic CAN and CAN FD frames are allocated with seperate
functions: alloc_can_skb() and alloc_canfd_skb().

In order to support CAN FD frames via the rx-offload helper, the driver
itself has to allocate the skb (depending whether it received a classic
CAN or CAN FD frame), as the rx-offload helper cannot know which kind of
CAN frame the driver has received.

This patch moves the allocation of the skb into the struct
can_rx_offload::mailbox_read callbacks of the the flexcan and ti_hecc
driver and adjusts the rx-offload helper accordingly.

Signed-off-by: Joakim Zhang <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: can_rx_offload_reset(): remove no-op function

This patch removes the function can_rx_offload_reset(), as it does
nothing. If we ever need this function, add it back again.

Signed-o

can: rx-offload: can_rx_offload_reset(): remove no-op function

This patch removes the function can_rx_offload_reset(), as it does
nothing. If we ever need this function, add it back again.

Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: dev: avoid long lines

This patch fixes long lines in the generic CAN device infrastructure.

Signed-off-by: Marc Kleine-Budde <[email protected]>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 495

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 495

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the version 2 of the gnu general public
license as published by the free software foundation this program is
distributed in the hope that it will be useful but without any
warranty without even the implied warranty of merchantability or
fitness for a particular purpose see the gnu general public license
for more details

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 10 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Reviewed-by: Enrico Weigelt <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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can: rx-offload: rename can_rx_offload_irq_queue_err_skb() to can_rx_offload_queue_tail()

This function has nothing todo with error.

Signed-off-by: Oleksij Rempel <[email protected]>
Cc: linu

can: rx-offload: rename can_rx_offload_irq_queue_err_skb() to can_rx_offload_queue_tail()

This function has nothing todo with error.

Signed-off-by: Oleksij Rempel <[email protected]>
Cc: linux-stable <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: introduce can_rx_offload_get_echo_skb() and can_rx_offload_queue_sorted() functions

Current CAN framework can't guarantee proper/chronological order
of RX and TX-ECHO messages. To m

can: rx-offload: introduce can_rx_offload_get_echo_skb() and can_rx_offload_queue_sorted() functions

Current CAN framework can't guarantee proper/chronological order
of RX and TX-ECHO messages. To make this possible, drivers should use
this functions instead of can_get_echo_skb().

Signed-off-by: Oleksij Rempel <[email protected]>
Cc: linux-stable <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: Add support for timestamp based irq offloading

Some CAN controllers don't implement a FIFO in hardware, but fill their
mailboxes in a particular order (from lowest to highest or hig

can: rx-offload: Add support for timestamp based irq offloading

Some CAN controllers don't implement a FIFO in hardware, but fill their
mailboxes in a particular order (from lowest to highest or highest to lowest).
This makes problems to read the frames in the correct order from the hardware,
as new frames might be filled into just read (low) mailboxes. This gets worse,
when following new frames are received into not read (higher) mailboxes.

On the bright side some these CAN controllers put a timestamp on each received
CAN frame. This patch adds support to offload CAN frames in interrupt context,
order them by timestamp and then transmitted in a NAPI context.

Signed-off-by: Marc Kleine-Budde <[email protected]>

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can: rx-offload: Add support for HW fifo based irq offloading

Some CAN controllers have a usable FIFO already but can still benefit
from off-loading the CAN controller FIFO. The CAN frames of the FI

can: rx-offload: Add support for HW fifo based irq offloading

Some CAN controllers have a usable FIFO already but can still benefit
from off-loading the CAN controller FIFO. The CAN frames of the FIFO are
read and put into a skb queue during interrupt and then transmitted in a
NAPI context.

Signed-off-by: David Jander <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

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