linux-toradex.git/include/linux/can, branch v4.11-rc3

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

2017-02-06T14:13:24+00:00

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

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

2017-02-06T14:13:23+00:00

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 
Signed-off-by: Marc Kleine-Budde

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-02-02T21:54:00+00:00

All merge conflicts were simple overlapping changes.

Signed-off-by: David S. Miller

can: Fix kernel panic at security_sock_rcv_skb

2017-01-29T23:30:56+00:00

Zhang Yanmin reported crashes [1] and provided a patch adding a
synchronize_rcu() call in can_rx_unregister()

The main problem seems that the sockets themselves are not RCU
protected.

If CAN uses RCU for delivery, then sockets should be freed only after
one RCU grace period.

Recent kernels could use sock_set_flag(sk, SOCK_RCU_FREE), but let's
ease stable backports with the following fix instead.

[1]
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [] selinux_socket_sock_rcv_skb+0x65/0x2a0

Call Trace:
 
 [] security_sock_rcv_skb+0x4c/0x60
 [] sk_filter+0x41/0x210
 [] sock_queue_rcv_skb+0x53/0x3a0
 [] raw_rcv+0x2a3/0x3c0
 [] can_rcv_filter+0x12b/0x370
 [] can_receive+0xd9/0x120
 [] can_rcv+0xab/0x100
 [] __netif_receive_skb_core+0xd8c/0x11f0
 [] __netif_receive_skb+0x24/0xb0
 [] process_backlog+0x127/0x280
 [] net_rx_action+0x33b/0x4f0
 [] __do_softirq+0x184/0x440
 [] do_softirq_own_stack+0x1c/0x30
 
 [] do_softirq.part.18+0x3b/0x40
 [] do_softirq+0x1d/0x20
 [] netif_rx_ni+0xe5/0x110
 [] slcan_receive_buf+0x507/0x520
 [] flush_to_ldisc+0x21c/0x230
 [] process_one_work+0x24f/0x670
 [] worker_thread+0x9d/0x6f0
 [] ? rescuer_thread+0x480/0x480
 [] kthread+0x12c/0x150
 [] ret_from_fork+0x3f/0x70

Reported-by: Zhang Yanmin 
Signed-off-by: Eric Dumazet 
Acked-by: Oliver Hartkopp 
Signed-off-by: David S. Miller

can: dev: add CAN interface API for fixed bitrates

2017-01-24T12:52:00+00:00

Some CAN interfaces only support fixed fixed bitrates. This patch adds a
netlink interface to get the list of the CAN interface's fixed bitrates and
data bitrates.

Inside the driver arrays of supported data- bitrate values are defined.

const u32 drvname_bitrate[] = { 20000, 50000, 100000 };
const u32 drvname_data_bitrate[] = { 200000, 500000, 1000000 };

struct drvname_priv *priv;
priv = netdev_priv(dev);

priv->bitrate_const = drvname_bitrate;
priv->bitrate_const_cnt = ARRAY_SIZE(drvname_bitrate);
priv->data_bitrate_const = drvname_data_bitrate;
priv->data_bitrate_const_cnt = ARRAY_SIZE(drvname_data_bitrate);

Signed-off-by: Marc Kleine-Budde

can: dev: add CAN interface termination API

2017-01-24T12:52:00+00:00

This patch adds a netlink interface to configure the CAN bus termination of
CAN interfaces.

Inside the driver an array of supported termination values is defined:

const u16 drvname_termination[] = { 60, 120, CAN_TERMINATION_DISABLED };

struct drvname_priv *priv;
priv = netdev_priv(dev);

priv->termination_const = drvname_termination;
priv->termination_const_cnt = ARRAY_SIZE(drvname_termination);
priv->termination = CAN_TERMINATION_DISABLED;

And the funtion to set the value has to be defined:

priv->do_set_termination = drvname_set_termination;

Signed-off-by: Oliver Hartkopp 
Reviewed-by: Ramesh Shanmugasundaram 
Signed-off-by: Marc Kleine-Budde

can: dev: fix deadlock reported after bus-off

2016-09-22T08:01:21+00:00

A timer was used to restart after the bus-off state, leading to a
relatively large can_restart() executed in an interrupt context,
which in turn sets up pinctrl. When this happens during system boot,
there is a high probability of grabbing the pinctrl_list_mutex,
which is locked already by the probe() of other device, making the
kernel suspect a deadlock condition [1].

To resolve this issue, the restart_timer is replaced by a delayed
work.

[1] https://github.com/victronenergy/venus/issues/24

Signed-off-by: Sergei Miroshnichenko 
Cc: linux-stable 
Signed-off-by: Marc Kleine-Budde

can: fix handling of unmodifiable configuration options

2016-05-09T09:07:28+00:00

As described in 'can: m_can: tag current CAN FD controllers as non-ISO'
(6cfda7fbebe) it is possible to define fixed configuration options by
setting the according bit in 'ctrlmode' and clear it in 'ctrlmode_supported'.
This leads to the incovenience that the fixed configuration bits can not be
passed by netlink even when they have the correct values (e.g. non-ISO, FD).

This patch fixes that issue and not only allows fixed set bit values to be set
again but now requires(!) to provide these fixed values at configuration time.
A valid CAN FD configuration consists of a nominal/arbitration bittiming, a
data bittiming and a control mode with CAN_CTRLMODE_FD set - which is now
enforced by a new can_validate() function. This fix additionally removed the
inconsistency that was prohibiting the support of 'CANFD-only' controller
drivers, like the RCar CAN FD.

For this reason a new helper can_set_static_ctrlmode() has been introduced to
provide a proper interface to handle static enabled CAN controller options.

Reported-by: Ramesh Shanmugasundaram 
Signed-off-by: Oliver Hartkopp 
Reviewed-by: Ramesh Shanmugasundaram  
Cc:  # >= 3.18
Signed-off-by: Marc Kleine-Budde

net/can: can_dropped_invalid_skb can be boolean

2015-10-09T14:49:01+00:00

This patch makes can_dropped_invalid_skb return bool due to this
particular function only using either one or zero as its return
value.

No functional change.

Signed-off-by: Yaowei Bai 
Acked-by: Marc Kleine-Budde 
Signed-off-by: David S. Miller

can: headers: make header files self contained

2015-09-21T06:38:22+00:00

This patch adds the missing #include-s to the dev.h and led.h, so that they can
be used without including further header files.

Signed-off-by: Marc Kleine-Budde