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authorOliver Hartkopp <socketcan@hartkopp.net>2016-03-21 22:18:21 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2016-05-09 12:07:28 +0300
commitbb208f144cf3f59d8f89a09a80efd04389718907 (patch)
treedbf6d52a61a76aafa28e907d6d419464aa3fba89 /include/linux/can
parentb6fd3aba6041922e115bd8e10539b8545f4120ac (diff)
downloadlinux-bb208f144cf3f59d8f89a09a80efd04389718907.tar.xz
can: fix handling of unmodifiable configuration options
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 <ramesh.shanmugasundaram@bp.renesas.com> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Reviewed-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Cc: <stable@vger.kernel.org> # >= 3.18 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/can')
-rw-r--r--include/linux/can/dev.h22
1 files changed, 20 insertions, 2 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 735f9f8c4e43..5261751f6bd4 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -40,8 +40,11 @@ struct can_priv {
struct can_clock clock;
enum can_state state;
- u32 ctrlmode;
- u32 ctrlmode_supported;
+
+ /* CAN controller features - see include/uapi/linux/can/netlink.h */
+ u32 ctrlmode; /* current options setting */
+ u32 ctrlmode_supported; /* options that can be modified by netlink */
+ u32 ctrlmode_static; /* static enabled options for driver/hardware */
int restart_ms;
struct timer_list restart_timer;
@@ -108,6 +111,21 @@ static inline bool can_is_canfd_skb(const struct sk_buff *skb)
return skb->len == CANFD_MTU;
}
+/* helper to define static CAN controller features at device creation time */
+static inline void can_set_static_ctrlmode(struct net_device *dev,
+ u32 static_mode)
+{
+ struct can_priv *priv = netdev_priv(dev);
+
+ /* alloc_candev() succeeded => netdev_priv() is valid at this point */
+ priv->ctrlmode = static_mode;
+ priv->ctrlmode_static = static_mode;
+
+ /* override MTU which was set by default in can_setup()? */
+ if (static_mode & CAN_CTRLMODE_FD)
+ dev->mtu = CANFD_MTU;
+}
+
/* get data length from can_dlc with sanitized can_dlc */
u8 can_dlc2len(u8 can_dlc);