diff options
| -rw-r--r-- | drivers/net/can/dev.c | 56 | ||||
| -rw-r--r-- | drivers/net/can/m_can/m_can.c | 2 | ||||
| -rw-r--r-- | include/linux/can/dev.h | 22 |
3 files changed, 73 insertions, 7 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 141c2a42d7ed..910c12e2638e 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -696,11 +696,17 @@ int can_change_mtu(struct net_device *dev, int new_mtu) /* allow change of MTU according to the CANFD ability of the device */ switch (new_mtu) { case CAN_MTU: + /* 'CANFD-only' controllers can not switch to CAN_MTU */ + if (priv->ctrlmode_static & CAN_CTRLMODE_FD) + return -EINVAL; + priv->ctrlmode &= ~CAN_CTRLMODE_FD; break; case CANFD_MTU: - if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD)) + /* check for potential CANFD ability */ + if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) && + !(priv->ctrlmode_static & CAN_CTRLMODE_FD)) return -EINVAL; priv->ctrlmode |= CAN_CTRLMODE_FD; @@ -782,6 +788,35 @@ static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { = { .len = sizeof(struct can_bittiming_const) }, }; +static int can_validate(struct nlattr *tb[], struct nlattr *data[]) +{ + bool is_can_fd = false; + + /* Make sure that valid CAN FD configurations always consist of + * - nominal/arbitration bittiming + * - data bittiming + * - control mode with CAN_CTRLMODE_FD set + */ + + if (data[IFLA_CAN_CTRLMODE]) { + struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]); + + is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD; + } + + if (is_can_fd) { + if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING]) + return -EOPNOTSUPP; + } + + if (data[IFLA_CAN_DATA_BITTIMING]) { + if (!is_can_fd || !data[IFLA_CAN_BITTIMING]) + return -EOPNOTSUPP; + } + + return 0; +} + static int can_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { @@ -813,19 +848,31 @@ static int can_changelink(struct net_device *dev, if (data[IFLA_CAN_CTRLMODE]) { struct can_ctrlmode *cm; + u32 ctrlstatic; + u32 maskedflags; /* Do not allow changing controller mode while running */ if (dev->flags & IFF_UP) return -EBUSY; cm = nla_data(data[IFLA_CAN_CTRLMODE]); + ctrlstatic = priv->ctrlmode_static; + maskedflags = cm->flags & cm->mask; + + /* check whether provided bits are allowed to be passed */ + if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic)) + return -EOPNOTSUPP; + + /* do not check for static fd-non-iso if 'fd' is disabled */ + if (!(maskedflags & CAN_CTRLMODE_FD)) + ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; - /* check whether changed bits are allowed to be modified */ - if (cm->mask & ~priv->ctrlmode_supported) + /* make sure static options are provided by configuration */ + if ((maskedflags & ctrlstatic) != ctrlstatic) return -EOPNOTSUPP; /* clear bits to be modified and copy the flag values */ priv->ctrlmode &= ~cm->mask; - priv->ctrlmode |= (cm->flags & cm->mask); + priv->ctrlmode |= maskedflags; /* CAN_CTRLMODE_FD can only be set when driver supports FD */ if (priv->ctrlmode & CAN_CTRLMODE_FD) @@ -966,6 +1013,7 @@ static struct rtnl_link_ops can_link_ops __read_mostly = { .maxtype = IFLA_CAN_MAX, .policy = can_policy, .setup = can_setup, + .validate = can_validate, .newlink = can_newlink, .changelink = can_changelink, .get_size = can_get_size, diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 39cf911f7a1e..195f15edb32e 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -955,7 +955,7 @@ static struct net_device *alloc_m_can_dev(void) priv->can.do_get_berr_counter = m_can_get_berr_counter; /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.1 */ - priv->can.ctrlmode = CAN_CTRLMODE_FD_NON_ISO; + can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO); /* CAN_CTRLMODE_FD_NON_ISO can not be changed with M_CAN IP v3.0.1 */ priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 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); |