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vcan: add CAN FD support

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- move the length calculation from dlc to real length (using canfd_frame)
- allow to switch the driver between CAN and CAN FD (change of MTU)

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2012-06-13 20:56:59 +02:00 committed by Marc Kleine-Budde
parent 1e0625faca
commit 41052ef6df
1 changed files with 20 additions and 7 deletions
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27
drivers/net/can/vcan.c
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@ -70,13 +70,12 @@ MODULE_PARM_DESC(echo, "Echo sent frames (for testing). Default: 0 (Off)");
static void vcan_rx(struct sk_buff *skb, struct net_device *dev)
{
struct can_frame *cf = (struct can_frame *)skb->data;
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
struct net_device_stats *stats = &dev->stats;
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
stats->rx_bytes += cfd->len;
skb->protocol = htons(ETH_P_CAN);
skb->pkt_type = PACKET_BROADCAST;
skb->dev = dev;
skb->ip_summed = CHECKSUM_UNNECESSARY;
@ -86,7 +85,7 @@ static void vcan_rx(struct sk_buff *skb, struct net_device *dev)
static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
{
struct can_frame *cf = (struct can_frame *)skb->data;
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
struct net_device_stats *stats = &dev->stats;
int loop;
@ -94,7 +93,7 @@ static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
stats->tx_packets++;
stats->tx_bytes += cf->can_dlc;
stats->tx_bytes += cfd->len;
/* set flag whether this packet has to be looped back */
loop = skb->pkt_type == PACKET_LOOPBACK;
@ -108,7 +107,7 @@ static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
* CAN core already did the echo for us
*/
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
stats->rx_bytes += cfd->len;
}
kfree_skb(skb);
return NETDEV_TX_OK;
@ -133,14 +132,28 @@ static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
static int vcan_change_mtu(struct net_device *dev, int new_mtu)
{
/* Do not allow changing the MTU while running */
if (dev->flags & IFF_UP)
return -EBUSY;
if (new_mtu != CAN_MTU && new_mtu != CANFD_MTU)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static const struct net_device_ops vcan_netdev_ops = {
.ndo_start_xmit = vcan_tx,
.ndo_change_mtu = vcan_change_mtu,
};
static void vcan_setup(struct net_device *dev)
{
dev->type = ARPHRD_CAN;
dev->mtu = sizeof(struct can_frame);
dev->mtu = CAN_MTU;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->tx_queue_len = 0;