static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct can_frame *frame = (struct can_frame *)skb->data;
struct c_can_priv *priv = netdev_priv(dev);
u32 idx, obj;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
/*
* This is not a FIFO. C/D_CAN sends out the buffers
* prioritized. The lowest buffer number wins.
*/
idx = fls(atomic_read(&priv->tx_active));
obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
/* If this is the last buffer, stop the xmit queue */
if (idx == C_CAN_MSG_OBJ_TX_NUM - 1)
netif_stop_queue(dev);
/*
* Store the message in the interface so we can call
* can_put_echo_skb(). We must do this before we enable
* transmit as we might race against do_tx().
*/
c_can_setup_tx_object(dev, IF_TX, frame, idx);
priv->dlc[idx] = frame->can_dlc;
can_put_echo_skb(skb, dev, idx);
/* Update the active bits */
atomic_add((1 << idx), &priv->tx_active);
/* Start transmission */
c_can_object_put(dev, IF_TX, obj, IF_COMM_TX);
return NETDEV_TX_OK;
}
static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
u32 msg_obj_no;
struct c_can_priv *priv = netdev_priv(dev);
struct can_frame *frame = (struct can_frame *)skb->data;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
msg_obj_no = get_tx_next_msg_obj(priv);
/* prepare message object for transmission */
c_can_write_msg_object(dev, 0, frame, msg_obj_no);
can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
/*
* we have to stop the queue in case of a wrap around or
* if the next TX message object is still in use
*/
priv->tx_next++;
if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv)) ||
(priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)
netif_stop_queue(dev);
return NETDEV_TX_OK;
}
/*
* ti_hecc_xmit: HECC Transmit
*
* The transmit mailboxes start from 0 to HECC_MAX_TX_MBOX. In HECC the
* priority of the mailbox for tranmission is dependent upon priority setting
* field in mailbox registers. The mailbox with highest value in priority field
* is transmitted first. Only when two mailboxes have the same value in
* priority field the highest numbered mailbox is transmitted first.
*
* To utilize the HECC priority feature as described above we start with the
* highest numbered mailbox with highest priority level and move on to the next
* mailbox with the same priority level and so on. Once we loop through all the
* transmit mailboxes we choose the next priority level (lower) and so on
* until we reach the lowest priority level on the lowest numbered mailbox
* when we stop transmission until all mailboxes are transmitted and then
* restart at highest numbered mailbox with highest priority.
*
* Two counters (head and tail) are used to track the next mailbox to transmit
* and to track the echo buffer for already transmitted mailbox. The queue
* is stopped when all the mailboxes are busy or when there is a priority
* value roll-over happens.
*/
static netdev_tx_t ti_hecc_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct ti_hecc_priv *priv = netdev_priv(ndev);
struct can_frame *cf = (struct can_frame *)skb->data;
u32 mbxno, mbx_mask, data;
unsigned long flags;
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
mbxno = get_tx_head_mb(priv);
mbx_mask = BIT(mbxno);
spin_lock_irqsave(&priv->mbx_lock, flags);
if (unlikely(hecc_read(priv, HECC_CANME) & mbx_mask)) {
spin_unlock_irqrestore(&priv->mbx_lock, flags);
netif_stop_queue(ndev);
netdev_err(priv->ndev,
"BUG: TX mbx not ready tx_head=%08X, tx_tail=%08X\n",
priv->tx_head, priv->tx_tail);
return NETDEV_TX_BUSY;
}
spin_unlock_irqrestore(&priv->mbx_lock, flags);
/* Prepare mailbox for transmission */
data = cf->can_dlc | (get_tx_head_prio(priv) << 8);
if (cf->can_id & CAN_RTR_FLAG) /* Remote transmission request */
data |= HECC_CANMCF_RTR;
hecc_write_mbx(priv, mbxno, HECC_CANMCF, data);
if (cf->can_id & CAN_EFF_FLAG) /* Extended frame format */
data = (cf->can_id & CAN_EFF_MASK) | HECC_CANMID_IDE;
else /* Standard frame format */
data = (cf->can_id & CAN_SFF_MASK) << 18;
hecc_write_mbx(priv, mbxno, HECC_CANMID, data);
hecc_write_mbx(priv, mbxno, HECC_CANMDL,
be32_to_cpu(*(u32 *)(cf->data)));
if (cf->can_dlc > 4)
hecc_write_mbx(priv, mbxno, HECC_CANMDH,
be32_to_cpu(*(u32 *)(cf->data + 4)));
else
*(u32 *)(cf->data + 4) = 0;
can_put_echo_skb(skb, ndev, mbxno);
spin_lock_irqsave(&priv->mbx_lock, flags);
--priv->tx_head;
if ((hecc_read(priv, HECC_CANME) & BIT(get_tx_head_mb(priv))) ||
(priv->tx_head & HECC_TX_MASK) == HECC_TX_MASK) {
netif_stop_queue(ndev);
}
hecc_set_bit(priv, HECC_CANME, mbx_mask);
spin_unlock_irqrestore(&priv->mbx_lock, flags);
hecc_clear_bit(priv, HECC_CANMD, mbx_mask);
hecc_set_bit(priv, HECC_CANMIM, mbx_mask);
hecc_write(priv, HECC_CANTRS, mbx_mask);
return NETDEV_TX_OK;
}
static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct can_frame *frame = (struct can_frame *)skb->data;
struct mscan_priv *priv = netdev_priv(dev);
struct mscan_regs __iomem *regs = priv->reg_base;
int i, rtr, buf_id;
u32 can_id;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
out_8(®s->cantier, 0);
i = ~priv->tx_active & MSCAN_TXE;
buf_id = ffs(i) - 1;
switch (hweight8(i)) {
case 0:
netif_stop_queue(dev);
netdev_err(dev, "Tx Ring full when queue awake!\n");
return NETDEV_TX_BUSY;
case 1:
/*
* if buf_id < 3, then current frame will be send out of order,
* since buffer with lower id have higher priority (hell..)
*/
netif_stop_queue(dev);
case 2:
if (buf_id < priv->prev_buf_id) {
priv->cur_pri++;
if (priv->cur_pri == 0xff) {
set_bit(F_TX_WAIT_ALL, &priv->flags);
netif_stop_queue(dev);
}
}
set_bit(F_TX_PROGRESS, &priv->flags);
break;
}
priv->prev_buf_id = buf_id;
out_8(®s->cantbsel, i);
rtr = frame->can_id & CAN_RTR_FLAG;
/* RTR is always the lowest bit of interest, then IDs follow */
if (frame->can_id & CAN_EFF_FLAG) {
can_id = (frame->can_id & CAN_EFF_MASK)
<< (MSCAN_EFF_RTR_SHIFT + 1);
if (rtr)
can_id |= 1 << MSCAN_EFF_RTR_SHIFT;
out_be16(®s->tx.idr3_2, can_id);
can_id >>= 16;
/* EFF_FLAGS are between the IDs :( */
can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0)
| MSCAN_EFF_FLAGS;
} else {
static int vcan_tx(struct sk_buff *skb, struct net_device *dev)
{
struct can_frame *cf = (struct can_frame *)skb->data;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
struct net_device_stats *stats = &dev->stats;
#else
struct net_device_stats *stats = netdev_priv(dev);
#endif
int loop;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
stats->tx_packets++;
stats->tx_bytes += cf->can_dlc;
/* set flag whether this packet has to be looped back */
loop = skb->pkt_type == PACKET_LOOPBACK;
if (!echo) {
/* no echo handling available inside this driver */
if (loop) {
/*
* only count the packets here, because the
* CAN core already did the echo for us
*/
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
}
kfree_skb(skb);
return NETDEV_TX_OK;
}
/* perform standard echo handling for CAN network interfaces */
if (loop) {
struct sock *srcsk = skb->sk;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return NETDEV_TX_OK;
/* receive with packet counting */
skb->sk = srcsk;
vcan_rx(skb, dev);
} else {
/* no looped packets => no counting */
kfree_skb(skb);
}
return NETDEV_TX_OK;
}
static netdev_tx_t netdev_start_xmit(struct sk_buff *skb,
struct net_device *dev)
#endif
{
struct softing_priv *priv = netdev_priv(dev);
struct softing *card = priv->card;
int ret;
int bhlock;
u8 *ptr;
u8 cmd;
unsigned int fifo_wr;
struct can_frame msg;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
if (in_interrupt()) {
bhlock = 0;
spin_lock(&card->spin);
} else {
bhlock = 1;
spin_lock_bh(&card->spin);
}
ret = NETDEV_TX_BUSY;
if (!card->fw.up)
goto xmit_done;
if (card->tx.pending >= TXMAX)
goto xmit_done;
if (priv->tx.pending >= TX_ECHO_SKB_MAX)
goto xmit_done;
fifo_wr = card->dpram.tx->wr;
if (fifo_wr == card->dpram.tx->rd)
/*fifo full */
goto xmit_done;
memcpy(&msg, skb->data, sizeof(msg));
ptr = &card->dpram.tx->fifo[fifo_wr][0];
cmd = CMD_TX;
if (msg.can_id & CAN_RTR_FLAG)
cmd |= CMD_RTR;
if (msg.can_id & CAN_EFF_FLAG)
cmd |= CMD_XTD;
if (priv->index)
cmd |= CMD_BUS2;
*ptr++ = cmd;
*ptr++ = msg.can_dlc;
*ptr++ = (msg.can_id >> 0);
*ptr++ = (msg.can_id >> 8);
if (msg.can_id & CAN_EFF_FLAG) {
*ptr++ = (msg.can_id >> 16);
*ptr++ = (msg.can_id >> 24);
} else {
static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
{
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
struct net_device_stats *stats = &dev->stats;
int loop;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
stats->tx_packets++;
stats->tx_bytes += cfd->len;
/* set flag whether this packet has to be looped back */
loop = skb->pkt_type == PACKET_LOOPBACK;
if (!echo) {
/* no echo handling available inside this driver */
if (loop) {
/*
* only count the packets here, because the
* CAN core already did the echo for us
*/
stats->rx_packets++;
stats->rx_bytes += cfd->len;
}
consume_skb(skb);
return NETDEV_TX_OK;
}
/* perform standard echo handling for CAN network interfaces */
if (loop) {
skb = can_create_echo_skb(skb);
if (!skb)
return NETDEV_TX_OK;
/* receive with packet counting */
vcan_rx(skb, dev);
} else {
/* no looped packets => no counting */
consume_skb(skb);
}
return NETDEV_TX_OK;
}
/* trigger the tx queue-ing */
static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct softing_priv *priv = netdev_priv(dev);
struct softing *card = priv->card;
int ret;
uint8_t *ptr;
uint8_t fifo_wr, fifo_rd;
struct can_frame *cf = (struct can_frame *)skb->data;
uint8_t buf[DPRAM_TX_SIZE];
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
spin_lock(&card->spin);
ret = NETDEV_TX_BUSY;
if (!card->fw.up ||
(card->tx.pending >= TXMAX) ||
(priv->tx.pending >= TX_ECHO_SKB_MAX))
goto xmit_done;
fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
if (fifo_wr == fifo_rd)
/* fifo full */
goto xmit_done;
memset(buf, 0, sizeof(buf));
ptr = buf;
*ptr = CMD_TX;
if (cf->can_id & CAN_RTR_FLAG)
*ptr |= CMD_RTR;
if (cf->can_id & CAN_EFF_FLAG)
*ptr |= CMD_XTD;
if (priv->index)
*ptr |= CMD_BUS2;
++ptr;
*ptr++ = cf->can_dlc;
*ptr++ = (cf->can_id >> 0);
*ptr++ = (cf->can_id >> 8);
if (cf->can_id & CAN_EFF_FLAG) {
*ptr++ = (cf->can_id >> 16);
*ptr++ = (cf->can_id >> 24);
} else {
static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf = (struct can_frame *)skb->data;
unsigned int mo = obj2msgobj(CC770_OBJ_TX);
u8 dlc, rtr;
u32 id;
int i;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
if ((cc770_read_reg(priv,
msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
netdev_err(dev, "TX register is still occupied!\n");
return NETDEV_TX_BUSY;
}
netif_stop_queue(dev);
dlc = cf->can_dlc;
id = cf->can_id;
if (cf->can_id & CAN_RTR_FLAG)
rtr = 0;
else
rtr = MSGCFG_DIR;
cc770_write_reg(priv, msgobj[mo].ctrl1,
RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_SET | RXIE_RES | INTPND_RES);
if (id & CAN_EFF_FLAG) {
id &= CAN_EFF_MASK;
cc770_write_reg(priv, msgobj[mo].config,
(dlc << 4) | rtr | MSGCFG_XTD);
cc770_write_reg(priv, msgobj[mo].id[3], id << 3);
cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
} else {
static netdev_tx_t vxcan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct vxcan_priv *priv = netdev_priv(dev);
struct net_device *peer;
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
struct net_device_stats *peerstats, *srcstats = &dev->stats;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
rcu_read_lock();
peer = rcu_dereference(priv->peer);
if (unlikely(!peer)) {
kfree_skb(skb);
dev->stats.tx_dropped++;
goto out_unlock;
}
skb = can_create_echo_skb(skb);
if (!skb)
goto out_unlock;
/* reset CAN GW hop counter */
skb->csum_start = 0;
skb->pkt_type = PACKET_BROADCAST;
skb->dev = peer;
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (netif_rx_ni(skb) == NET_RX_SUCCESS) {
srcstats->tx_packets++;
srcstats->tx_bytes += cfd->len;
peerstats = &peer->stats;
peerstats->rx_packets++;
peerstats->rx_bytes += cfd->len;
}
out_unlock:
rcu_read_unlock();
return NETDEV_TX_OK;
}
/* Send close command to device */
static int usb_8dev_cmd_close(struct usb_8dev_priv *priv)
{
struct usb_8dev_cmd_msg inmsg;
struct usb_8dev_cmd_msg outmsg = {
.channel = 0,
.command = USB_8DEV_CLOSE,
.opt1 = 0,
.opt2 = 0
};
return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
}
/* Get firmware and hardware version */
static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res)
{
struct usb_8dev_cmd_msg inmsg;
struct usb_8dev_cmd_msg outmsg = {
.channel = 0,
.command = USB_8DEV_GET_SOFTW_HARDW_VER,
.opt1 = 0,
.opt2 = 0
};
int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg);
if (err)
return err;
*res = be32_to_cpup((__be32 *)inmsg.data);
return err;
}
/* Set network device mode
*
* Maybe we should leave this function empty, because the device
* set mode variable with open command.
*/
static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
{
struct usb_8dev_priv *priv = netdev_priv(netdev);
int err = 0;
switch (mode) {
case CAN_MODE_START:
err = usb_8dev_cmd_open(priv);
if (err)
netdev_warn(netdev, "couldn't start device");
break;
default:
return -EOPNOTSUPP;
}
return err;
}
/* Read error/status frames */
static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
struct usb_8dev_rx_msg *msg)
{
struct can_frame *cf;
struct sk_buff *skb;
struct net_device_stats *stats = &priv->netdev->stats;
/* Error message:
* byte 0: Status
* byte 1: bit 7: Receive Passive
* byte 1: bit 0-6: Receive Error Counter
* byte 2: Transmit Error Counter
* byte 3: Always 0 (maybe reserved for future use)
*/
u8 state = msg->data[0];
u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
u8 txerr = msg->data[2];
int rx_errors = 0;
int tx_errors = 0;
skb = alloc_can_err_skb(priv->netdev, &cf);
if (!skb)
return;
switch (state) {
case USB_8DEV_STATUSMSG_OK:
priv->can.state = CAN_STATE_ERROR_ACTIVE;
cf->can_id |= CAN_ERR_PROT;
cf->data[2] = CAN_ERR_PROT_ACTIVE;
break;
case USB_8DEV_STATUSMSG_BUSOFF:
priv->can.state = CAN_STATE_BUS_OFF;
cf->can_id |= CAN_ERR_BUSOFF;
can_bus_off(priv->netdev);
break;
case USB_8DEV_STATUSMSG_OVERRUN:
case USB_8DEV_STATUSMSG_BUSLIGHT:
case USB_8DEV_STATUSMSG_BUSHEAVY:
cf->can_id |= CAN_ERR_CRTL;
break;
default:
priv->can.state = CAN_STATE_ERROR_WARNING;
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
priv->can.can_stats.bus_error++;
break;
}
switch (state) {
case USB_8DEV_STATUSMSG_OK:
case USB_8DEV_STATUSMSG_BUSOFF:
break;
case USB_8DEV_STATUSMSG_ACK:
cf->can_id |= CAN_ERR_ACK;
tx_errors = 1;
break;
case USB_8DEV_STATUSMSG_CRC:
cf->data[2] |= CAN_ERR_PROT_UNSPEC;
cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
CAN_ERR_PROT_LOC_CRC_DEL;
rx_errors = 1;
break;
case USB_8DEV_STATUSMSG_BIT0:
cf->data[2] |= CAN_ERR_PROT_BIT0;
tx_errors = 1;
break;
case USB_8DEV_STATUSMSG_BIT1:
cf->data[2] |= CAN_ERR_PROT_BIT1;
tx_errors = 1;
break;
case USB_8DEV_STATUSMSG_FORM:
cf->data[2] |= CAN_ERR_PROT_FORM;
rx_errors = 1;
break;
case USB_8DEV_STATUSMSG_STUFF:
cf->data[2] |= CAN_ERR_PROT_STUFF;
rx_errors = 1;
break;
case USB_8DEV_STATUSMSG_OVERRUN:
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_over_errors++;
rx_errors = 1;
break;
case USB_8DEV_STATUSMSG_BUSLIGHT:
priv->can.state = CAN_STATE_ERROR_WARNING;
cf->data[1] = (txerr > rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
priv->can.can_stats.error_warning++;
break;
case USB_8DEV_STATUSMSG_BUSHEAVY:
priv->can.state = CAN_STATE_ERROR_PASSIVE;
cf->data[1] = (txerr > rxerr) ?
CAN_ERR_CRTL_TX_PASSIVE :
CAN_ERR_CRTL_RX_PASSIVE;
priv->can.can_stats.error_passive++;
break;
default:
netdev_warn(priv->netdev,
"Unknown status/error message (%d)\n", state);
break;
}
if (tx_errors) {
cf->data[2] |= CAN_ERR_PROT_TX;
stats->tx_errors++;
}
if (rx_errors)
stats->rx_errors++;
cf->data[6] = txerr;
cf->data[7] = rxerr;
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
}
/* Read data and status frames */
static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
struct usb_8dev_rx_msg *msg)
{
struct can_frame *cf;
struct sk_buff *skb;
struct net_device_stats *stats = &priv->netdev->stats;
if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
msg->flags == USB_8DEV_ERR_FLAG) {
usb_8dev_rx_err_msg(priv, msg);
} else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
skb = alloc_can_skb(priv->netdev, &cf);
if (!skb)
return;
cf->can_id = be32_to_cpu(msg->id);
cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
if (msg->flags & USB_8DEV_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->flags & USB_8DEV_RTR)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, msg->data, cf->can_dlc);
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
can_led_event(priv->netdev, CAN_LED_EVENT_RX);
} else {
netdev_warn(priv->netdev, "frame type %d unknown",
msg->type);
}
}
/* Callback for reading data from device
*
* Check urb status, call read function and resubmit urb read operation.
*/
static void usb_8dev_read_bulk_callback(struct urb *urb)
{
struct usb_8dev_priv *priv = urb->context;
struct net_device *netdev;
int retval;
int pos = 0;
netdev = priv->netdev;
if (!netif_device_present(netdev))
return;
switch (urb->status) {
case 0: /* success */
break;
case -ENOENT:
case -ESHUTDOWN:
return;
default:
netdev_info(netdev, "Rx URB aborted (%d)\n",
urb->status);
goto resubmit_urb;
}
while (pos < urb->actual_length) {
struct usb_8dev_rx_msg *msg;
if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
netdev_err(priv->netdev, "format error\n");
break;
}
msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
usb_8dev_rx_can_msg(priv, msg);
pos += sizeof(struct usb_8dev_rx_msg);
}
resubmit_urb:
usb_fill_bulk_urb(urb, priv->udev,
usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
urb->transfer_buffer, RX_BUFFER_SIZE,
usb_8dev_read_bulk_callback, priv);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval == -ENODEV)
netif_device_detach(netdev);
else if (retval)
netdev_err(netdev,
"failed resubmitting read bulk urb: %d\n", retval);
}
/* Callback handler for write operations
*
* Free allocated buffers, check transmit status and
* calculate statistic.
*/
static void usb_8dev_write_bulk_callback(struct urb *urb)
{
struct usb_8dev_tx_urb_context *context = urb->context;
struct usb_8dev_priv *priv;
struct net_device *netdev;
BUG_ON(!context);
priv = context->priv;
netdev = priv->netdev;
/* free up our allocated buffer */
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
atomic_dec(&priv->active_tx_urbs);
if (!netif_device_present(netdev))
return;
if (urb->status)
netdev_info(netdev, "Tx URB aborted (%d)\n",
urb->status);
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += context->dlc;
can_get_echo_skb(netdev, context->echo_index);
can_led_event(netdev, CAN_LED_EVENT_TX);
/* Release context */
context->echo_index = MAX_TX_URBS;
netif_wake_queue(netdev);
}
/* Send data to device */
static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct usb_8dev_priv *priv = netdev_priv(netdev);
struct net_device_stats *stats = &netdev->stats;
struct can_frame *cf = (struct can_frame *) skb->data;
struct usb_8dev_tx_msg *msg;
struct urb *urb;
struct usb_8dev_tx_urb_context *context = NULL;
u8 *buf;
int i, err;
size_t size = sizeof(struct usb_8dev_tx_msg);
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
/* create a URB, and a buffer for it, and copy the data to the URB */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
netdev_err(netdev, "No memory left for URBs\n");
goto nomem;
}
buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
&urb->transfer_dma);
if (!buf) {
netdev_err(netdev, "No memory left for USB buffer\n");
goto nomembuf;
}
memset(buf, 0, size);
msg = (struct usb_8dev_tx_msg *)buf;
msg->begin = USB_8DEV_DATA_START;
msg->flags = 0x00;
if (cf->can_id & CAN_RTR_FLAG)
msg->flags |= USB_8DEV_RTR;
if (cf->can_id & CAN_EFF_FLAG)
msg->flags |= USB_8DEV_EXTID;
msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
msg->dlc = cf->can_dlc;
memcpy(msg->data, cf->data, cf->can_dlc);
msg->end = USB_8DEV_DATA_END;
for (i = 0; i < MAX_TX_URBS; i++) {
if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
context = &priv->tx_contexts[i];
break;
}
}
/* May never happen! When this happens we'd more URBs in flight as
* allowed (MAX_TX_URBS).
*/
if (!context)
goto nofreecontext;
context->priv = priv;
context->echo_index = i;
context->dlc = cf->can_dlc;
usb_fill_bulk_urb(urb, priv->udev,
usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
buf, size, usb_8dev_write_bulk_callback, context);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &priv->tx_submitted);
can_put_echo_skb(skb, netdev, context->echo_index);
atomic_inc(&priv->active_tx_urbs);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err))
goto failed;
else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
/* Slow down tx path */
netif_stop_queue(netdev);
/* Release our reference to this URB, the USB core will eventually free
* it entirely.
*/
usb_free_urb(urb);
return NETDEV_TX_OK;
nofreecontext:
usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
usb_free_urb(urb);
netdev_warn(netdev, "couldn't find free context");
return NETDEV_TX_BUSY;
failed:
can_free_echo_skb(netdev, context->echo_index);
usb_unanchor_urb(urb);
usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
atomic_dec(&priv->active_tx_urbs);
if (err == -ENODEV)
netif_device_detach(netdev);
else
netdev_warn(netdev, "failed tx_urb %d\n", err);
nomembuf:
usb_free_urb(urb);
nomem:
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
static int usb_8dev_get_berr_counter(const struct net_device *netdev,
struct can_berr_counter *bec)
{
struct usb_8dev_priv *priv = netdev_priv(netdev);
bec->txerr = priv->bec.txerr;
bec->rxerr = priv->bec.rxerr;
return 0;
}
/* Start USB device */
static int usb_8dev_start(struct usb_8dev_priv *priv)
{
struct net_device *netdev = priv->netdev;
int err, i;
for (i = 0; i < MAX_RX_URBS; i++) {
struct urb *urb = NULL;
u8 *buf;
/* create a URB, and a buffer for it */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
netdev_err(netdev, "No memory left for URBs\n");
err = -ENOMEM;
break;
}
buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
netdev_err(netdev, "No memory left for USB buffer\n");
usb_free_urb(urb);
err = -ENOMEM;
break;
}
usb_fill_bulk_urb(urb, priv->udev,
usb_rcvbulkpipe(priv->udev,
USB_8DEV_ENDP_DATA_RX),
buf, RX_BUFFER_SIZE,
usb_8dev_read_bulk_callback, priv);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &priv->rx_submitted);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err) {
usb_unanchor_urb(urb);
usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
urb->transfer_dma);
usb_free_urb(urb);
break;
}
/* Drop reference, USB core will take care of freeing it */
usb_free_urb(urb);
}
/* Did we submit any URBs */
if (i == 0) {
netdev_warn(netdev, "couldn't setup read URBs\n");
return err;
}
/* Warn if we've couldn't transmit all the URBs */
if (i < MAX_RX_URBS)
netdev_warn(netdev, "rx performance may be slow\n");
err = usb_8dev_cmd_open(priv);
if (err)
goto failed;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
return 0;
failed:
if (err == -ENODEV)
netif_device_detach(priv->netdev);
netdev_warn(netdev, "couldn't submit control: %d\n", err);
return err;
}
/* Open USB device */
static int usb_8dev_open(struct net_device *netdev)
{
struct usb_8dev_priv *priv = netdev_priv(netdev);
int err;
/* common open */
err = open_candev(netdev);
if (err)
return err;
can_led_event(netdev, CAN_LED_EVENT_OPEN);
/* finally start device */
err = usb_8dev_start(priv);
if (err) {
if (err == -ENODEV)
netif_device_detach(priv->netdev);
netdev_warn(netdev, "couldn't start device: %d\n",
err);
close_candev(netdev);
return err;
}
netif_start_queue(netdev);
return 0;
}
static void unlink_all_urbs(struct usb_8dev_priv *priv)
{
int i;
usb_kill_anchored_urbs(&priv->rx_submitted);
usb_kill_anchored_urbs(&priv->tx_submitted);
atomic_set(&priv->active_tx_urbs, 0);
for (i = 0; i < MAX_TX_URBS; i++)
priv->tx_contexts[i].echo_index = MAX_TX_URBS;
}
/* Close USB device */
static int usb_8dev_close(struct net_device *netdev)
{
struct usb_8dev_priv *priv = netdev_priv(netdev);
int err = 0;
/* Send CLOSE command to CAN controller */
err = usb_8dev_cmd_close(priv);
if (err)
netdev_warn(netdev, "couldn't stop device");
priv->can.state = CAN_STATE_STOPPED;
netif_stop_queue(netdev);
/* Stop polling */
unlink_all_urbs(priv);
close_candev(netdev);
can_led_event(netdev, CAN_LED_EVENT_STOP);
return err;
}
static const struct net_device_ops usb_8dev_netdev_ops = {
.ndo_open = usb_8dev_open,
.ndo_stop = usb_8dev_close,
.ndo_start_xmit = usb_8dev_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
static const struct can_bittiming_const usb_8dev_bittiming_const = {
.name = "usb_8dev",
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4,
.brp_min = 1,
.brp_max = 1024,
.brp_inc = 1,
};
/* Probe USB device
*
* Check device and firmware.
* Set supported modes and bittiming constants.
* Allocate some memory.
*/
static int usb_8dev_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct net_device *netdev;
struct usb_8dev_priv *priv;
int i, err = -ENOMEM;
u32 version;
char buf[18];
struct usb_device *usbdev = interface_to_usbdev(intf);
/* product id looks strange, better we also check iProduct string */
if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
return -ENODEV;
}
netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
if (!netdev) {
dev_err(&intf->dev, "Couldn't alloc candev\n");
return -ENOMEM;
}
priv = netdev_priv(netdev);
priv->udev = usbdev;
priv->netdev = netdev;
priv->can.state = CAN_STATE_STOPPED;
priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
priv->can.bittiming_const = &usb_8dev_bittiming_const;
priv->can.do_set_mode = usb_8dev_set_mode;
priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_ONE_SHOT;
netdev->netdev_ops = &usb_8dev_netdev_ops;
netdev->flags |= IFF_ECHO; /* we support local echo */
init_usb_anchor(&priv->rx_submitted);
init_usb_anchor(&priv->tx_submitted);
atomic_set(&priv->active_tx_urbs, 0);
for (i = 0; i < MAX_TX_URBS; i++)
priv->tx_contexts[i].echo_index = MAX_TX_URBS;
priv->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg),
GFP_KERNEL);
if (!priv->cmd_msg_buffer)
goto cleanup_candev;
usb_set_intfdata(intf, priv);
SET_NETDEV_DEV(netdev, &intf->dev);
mutex_init(&priv->usb_8dev_cmd_lock);
err = register_candev(netdev);
if (err) {
netdev_err(netdev,
"couldn't register CAN device: %d\n", err);
goto cleanup_cmd_msg_buffer;
}
err = usb_8dev_cmd_version(priv, &version);
if (err) {
netdev_err(netdev, "can't get firmware version\n");
goto cleanup_unregister_candev;
} else {
netdev_info(netdev,
"firmware: %d.%d, hardware: %d.%d\n",
(version>>24) & 0xff, (version>>16) & 0xff,
(version>>8) & 0xff, version & 0xff);
}
devm_can_led_init(netdev);
return 0;
cleanup_unregister_candev:
unregister_netdev(priv->netdev);
cleanup_cmd_msg_buffer:
kfree(priv->cmd_msg_buffer);
cleanup_candev:
free_candev(netdev);
return err;
}
/* Called by the usb core when driver is unloaded or device is removed */
static void usb_8dev_disconnect(struct usb_interface *intf)
{
struct usb_8dev_priv *priv = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
if (priv) {
netdev_info(priv->netdev, "device disconnected\n");
unregister_netdev(priv->netdev);
free_candev(priv->netdev);
unlink_all_urbs(priv);
}
}
static struct usb_driver usb_8dev_driver = {
.name = "usb_8dev",
.probe = usb_8dev_probe,
.disconnect = usb_8dev_disconnect,
.id_table = usb_8dev_table,
};
module_usb_driver(usb_8dev_driver);
MODULE_AUTHOR("Bernd Krumboeck <*****@*****.**>");
MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
MODULE_LICENSE("GPL v2");
static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct net_device_stats *stats = &dev->netdev->stats;
struct urb *urb;
struct gs_host_frame *hf;
struct can_frame *cf;
int rc;
unsigned int idx;
struct gs_tx_context *txc;
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
/* find an empty context to keep track of transmission */
txc = gs_alloc_tx_context(dev);
if (!txc)
return NETDEV_TX_BUSY;
/* create a URB, and a buffer for it */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
goto nomem_urb;
hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
&urb->transfer_dma);
if (!hf) {
netdev_err(netdev, "No memory left for USB buffer\n");
goto nomem_hf;
}
idx = txc->echo_id;
if (idx >= GS_MAX_TX_URBS) {
netdev_err(netdev, "Invalid tx context %d\n", idx);
goto badidx;
}
hf->echo_id = idx;
hf->channel = dev->channel;
cf = (struct can_frame *)skb->data;
hf->can_id = cf->can_id;
hf->can_dlc = cf->can_dlc;
memcpy(hf->data, cf->data, cf->can_dlc);
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
hf,
sizeof(*hf),
gs_usb_xmit_callback,
txc);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->tx_submitted);
can_put_echo_skb(skb, netdev, idx);
atomic_inc(&dev->active_tx_urbs);
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc)) { /* usb send failed */
atomic_dec(&dev->active_tx_urbs);
can_free_echo_skb(netdev, idx);
gs_free_tx_context(txc);
usb_unanchor_urb(urb);
usb_free_coherent(dev->udev,
sizeof(*hf),
hf,
urb->transfer_dma);
if (rc == -ENODEV) {
netif_device_detach(netdev);
} else {
netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
stats->tx_dropped++;
}
} else {
/* Slow down tx path */
if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
netif_stop_queue(netdev);
}
/* let usb core take care of this urb */
usb_free_urb(urb);
return NETDEV_TX_OK;
badidx:
usb_free_coherent(dev->udev,
sizeof(*hf),
hf,
urb->transfer_dma);
nomem_hf:
usb_free_urb(urb);
nomem_urb:
gs_free_tx_context(txc);
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct ems_usb *dev = netdev_priv(netdev);
struct ems_tx_urb_context *context = NULL;
struct net_device_stats *stats = &netdev->stats;
struct can_frame *cf = (struct can_frame *)skb->data;
struct ems_cpc_msg *msg;
struct urb *urb;
u8 *buf;
int i, err;
size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
+ sizeof(struct cpc_can_msg);
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
/* create a URB, and a buffer for it, and copy the data to the URB */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
netdev_err(netdev, "No memory left for URBs\n");
goto nomem;
}
buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
if (!buf) {
netdev_err(netdev, "No memory left for USB buffer\n");
usb_free_urb(urb);
goto nomem;
}
msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
msg->msg.can_msg.id = cf->can_id & CAN_ERR_MASK;
msg->msg.can_msg.length = cf->can_dlc;
if (cf->can_id & CAN_RTR_FLAG) {
msg->type = cf->can_id & CAN_EFF_FLAG ?
CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
msg->length = CPC_CAN_MSG_MIN_SIZE;
} else {
msg->type = cf->can_id & CAN_EFF_FLAG ?
CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
for (i = 0; i < cf->can_dlc; i++)
msg->msg.can_msg.msg[i] = cf->data[i];
msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
}
/* Respect byte order */
msg->msg.can_msg.id = cpu_to_le32(msg->msg.can_msg.id);
for (i = 0; i < MAX_TX_URBS; i++) {
if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
context = &dev->tx_contexts[i];
break;
}
}
/*
* May never happen! When this happens we'd more URBs in flight as
* allowed (MAX_TX_URBS).
*/
if (!context) {
usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
usb_free_urb(urb);
netdev_warn(netdev, "couldn't find free context\n");
return NETDEV_TX_BUSY;
}
context->dev = dev;
context->echo_index = i;
context->dlc = cf->can_dlc;
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
size, ems_usb_write_bulk_callback, context);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->tx_submitted);
can_put_echo_skb(skb, netdev, context->echo_index);
atomic_inc(&dev->active_tx_urbs);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err)) {
can_free_echo_skb(netdev, context->echo_index);
usb_unanchor_urb(urb);
usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
dev_kfree_skb(skb);
atomic_dec(&dev->active_tx_urbs);
if (err == -ENODEV) {
netif_device_detach(netdev);
} else {
netdev_warn(netdev, "failed tx_urb %d\n", err);
stats->tx_dropped++;
}
} else {
netdev->trans_start = jiffies;
/* Slow down tx path */
if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
dev->free_slots < 5) {
netif_stop_queue(netdev);
}
}
/*
* Release our reference to this URB, the USB core will eventually free
* it entirely.
*/
usb_free_urb(urb);
return NETDEV_TX_OK;
nomem:
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
static netdev_tx_t sam4e_netdev_start_xmit(
struct sk_buff *skb, struct net_device *netdev)
{
struct sam4e_req *req;
struct usb_device *udev;
struct sam4e_usb_handle *sam4e_usb_hnd = netdev_priv(netdev);
struct sam4e_usb *dev = sam4e_usb_hnd->sam4e_dev;
struct net_device_stats *stats = &netdev->stats;
int result;
struct can_frame *cf = (struct can_frame *)skb->data;
struct urb *urb;
size_t size = sizeof(struct sam4e_req) +
sizeof(struct sam4e_can_full_write);
struct sam4e_can_full_write *cfw;
if (can_dropped_invalid_skb(netdev, skb)) {
pr_err("Dropping invalid can frame");
return NETDEV_TX_OK;
}
udev = dev->udev;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
pr_err("No memory left for URBs\n");
goto nomem;
}
req = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
&urb->transfer_dma);
if (!req) {
pr_err("No memory left for USB buffer\n");
usb_free_urb(urb);
goto nomem;
}
/* Fill message data */
cfw = (struct sam4e_can_full_write *)&req->data;
req->cmd = CMD_CAN_FULL_WRITE;
req->len = sizeof(struct sam4e_req) +
sizeof(struct sam4e_can_full_write);
req->seq = atomic_inc_return(&dev->msg_seq);
cfw->can = sam4e_usb_hnd->owner_netdev_index;
cfw->mailbox = 0;
cfw->prio = 0;
cfw->mid = cf->can_id;
cfw->dlc = cf->can_dlc;
memcpy(cfw->data, cf->data, 8);
LOGNI(">%x %2d [%d] send frame [%d] %x %d %x %x %x %x %x %x %x %x\n",
req->cmd, req->len, req->seq,
atomic_read(&dev->active_tx_urbs), cfw->mid,
cfw->dlc, cfw->data[0], cfw->data[1], cfw->data[2],
cfw->data[3], cfw->data[4], cfw->data[5],
cfw->data[6], cfw->data[7]);
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, BULK_OUT_EP), req,
size, sam4e_usb_write_bulk_callback, netdev);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->tx_submitted);
atomic_inc(&dev->active_tx_urbs);
result = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(result)) {
usb_unanchor_urb(urb);
usb_free_coherent(dev->udev, size, req, urb->transfer_dma);
dev_kfree_skb(skb);
atomic_dec(&dev->active_tx_urbs);
if (result == -ENODEV) {
netif_device_detach(netdev);
} else {
pr_err("failed tx_urb %d\n", result);
stats->tx_dropped++;
}
} else {
/* Put on hold tx path */
if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS) {
LOGNI("Too many outstanding requests (%d). Stop queue",
atomic_read(&dev->active_tx_urbs));
atomic_inc(&dev->netif_queue_stop);
if (dev->netdev1)
netif_stop_queue(dev->netdev1);
if (dev->netdev2)
netif_stop_queue(dev->netdev2);
}
}
dev_kfree_skb(skb);
usb_free_urb(urb);
return NETDEV_TX_OK;
nomem:
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
