summaryrefslogtreecommitdiff
path: root/drivers/net/can/vcan.c
diff options
context:
space:
mode:
authorOliver Hartkopp <socketcan@hartkopp.net>2012-06-13 22:56:59 +0400
committerMarc Kleine-Budde <mkl@pengutronix.de>2012-06-19 23:40:20 +0400
commit41052ef6dfe90e7639103a010f49d13dadc55a28 (patch)
treef0e4a8230dd94ea76f1a7255c10fea6aa708a6f2 /drivers/net/can/vcan.c
parent1e0625facab2e871472472b7df87d8fbe6caf75a (diff)
downloadlinux-41052ef6dfe90e7639103a010f49d13dadc55a28.tar.xz
vcan: add CAN FD support
- 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>
Diffstat (limited to 'drivers/net/can/vcan.c')
-rw-r--r--drivers/net/can/vcan.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/net/can/vcan.c b/drivers/net/can/vcan.c
index ea2d94285936..4f93c0be0053 100644
--- a/drivers/net/can/vcan.c
+++ b/drivers/net/can/vcan.c
@@ -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;