diff options
Diffstat (limited to 'drivers/net/can')
| -rw-r--r-- | drivers/net/can/dev.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 8ebe112458c..4e20d82b799 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -595,6 +595,39 @@ void free_candev(struct net_device *dev) EXPORT_SYMBOL_GPL(free_candev); /* + * changing MTU and control mode for CAN/CANFD devices + */ +int can_change_mtu(struct net_device *dev, int new_mtu) +{ + struct can_priv *priv = netdev_priv(dev); + + /* Do not allow changing the MTU while running */ + if (dev->flags & IFF_UP) + return -EBUSY; + + /* allow change of MTU according to the CANFD ability of the device */ + switch (new_mtu) { + case CAN_MTU: + priv->ctrlmode &= ~CAN_CTRLMODE_FD; + break; + + case CANFD_MTU: + if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD)) + return -EINVAL; + + priv->ctrlmode |= CAN_CTRLMODE_FD; + break; + + default: + return -EINVAL; + } + + dev->mtu = new_mtu; + return 0; +} +EXPORT_SYMBOL_GPL(can_change_mtu); + +/* * Common open function when the device gets opened. * * This function should be called in the open function of the device @@ -693,6 +726,12 @@ static int can_changelink(struct net_device *dev, return -EOPNOTSUPP; priv->ctrlmode &= ~cm->mask; priv->ctrlmode |= cm->flags; + + /* CAN_CTRLMODE_FD can only be set when driver supports FD */ + if (priv->ctrlmode & CAN_CTRLMODE_FD) + dev->mtu = CANFD_MTU; + else + dev->mtu = CAN_MTU; } if (data[IFLA_CAN_RESTART_MS]) { |