The CAN error message frames (i.e. error skb) are an interface
specific to socket CAN. The payload of the CAN error message frames
does not correspond to any actual data sent on the wire. Only an error
flag and a delimiter are transmitted when an error occurs (c.f. ISO
11898-1 section 10.4.4.2 "Error flag").
For this reason, it makes no sense to increment the rx_packets and
rx_bytes fields of struct net_device_stats because no actual payload
were transmitted on the wire.
This patch fixes all the CAN drivers.
Link: https://lore.kernel.org/all/20211207121531.42941-2-mailhol.vincent@wanadoo.fr
CC: Marc Kleine-Budde <mkl@pengutronix.de>
CC: Nicolas Ferre <nicolas.ferre@microchip.com>
CC: Alexandre Belloni <alexandre.belloni@bootlin.com>
CC: Ludovic Desroches <ludovic.desroches@microchip.com>
CC: Chandrasekar Ramakrishnan <rcsekar@samsung.com>
CC: Maxime Ripard <mripard@kernel.org>
CC: Chen-Yu Tsai <wens@csie.org>
CC: Jernej Skrabec <jernej.skrabec@gmail.com>
CC: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
CC: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
CC: Michal Simek <michal.simek@xilinx.com>
CC: Stephane Grosjean <s.grosjean@peak-system.com>
Tested-by: Jimmy Assarsson <extja@kvaser.com> # kvaser
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Acked-by: Stefan Mätje <stefan.maetje@esd.eu> # esd_usb2
Tested-by: Stefan Mätje <stefan.maetje@esd.eu> # esd_usb2
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
}
at91_poll_err_frame(dev, cf, reg_sr);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
at91_irq_err_state(dev, cf, new_state);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->len;
netif_rx(skb);
priv->can.state = new_state;
unsigned int reg_err_counter;
unsigned int rx_err_passive;
struct c_can_priv *priv = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
static int cc770_err(struct net_device *dev, u8 status)
{
struct cc770_priv *priv = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 lec;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
static void can_restart(struct net_device *dev)
{
struct can_priv *priv = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct sk_buff *skb;
struct can_frame *cf;
int err;
cf->can_id |= CAN_ERR_RESTARTED;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
netif_rx_ni(skb);
restart:
struct can_frame *cf = (struct can_frame *)skb->data;
work_done++;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (!(cf->can_id & CAN_ERR_FLAG)) {
+ stats->rx_packets++;
+ stats->rx_bytes += cf->len;
+ }
netif_receive_skb(skb);
}
priv->base + IFI_CANFD_INTERRUPT);
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
enum can_state new_state)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
netif_rx(skb);
return 0;
}
if (skb) {
cf->can_id |= CAN_ERR_BUSERROR;
- stats->rx_bytes += cf->len;
- stats->rx_packets++;
netif_rx(skb);
} else {
stats->rx_dropped++;
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
if (cdev->is_peripheral)
timestamp = m_can_get_timestamp(cdev);
enum can_state new_state)
{
struct m_can_classdev *cdev = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
if (cdev->is_peripheral)
timestamp = m_can_get_timestamp(cdev);
continue;
}
- if (canrflg & MSCAN_RXF)
+ if (canrflg & MSCAN_RXF) {
mscan_get_rx_frame(dev, frame);
- else if (canrflg & MSCAN_ERR_IF)
+ stats->rx_packets++;
+ stats->rx_bytes += frame->len;
+ } else if (canrflg & MSCAN_ERR_IF) {
mscan_get_err_frame(dev, frame, canrflg);
+ }
- stats->rx_packets++;
- stats->rx_bytes += frame->len;
work_done++;
netif_receive_skb(skb);
}
priv->can.state = state;
netif_receive_skb(skb);
-
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
}
static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
return -ENOMEM;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
return 0;
cf->data[6] = priv->bec.txerr;
cf->data[7] = priv->bec.rxerr;
- stats->rx_bytes += cf->len;
- stats->rx_packets++;
netif_rx(skb);
return 0;
static void rcar_can_error(struct net_device *ndev)
{
struct rcar_can_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 eifr, txerr = 0, rxerr = 0;
}
}
- if (skb) {
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (skb)
netif_rx(skb);
- }
}
static void rcar_can_tx_done(struct net_device *ndev)
/* Clear channel error interrupts that are handled */
rcar_canfd_write(priv->base, RCANFD_CERFL(ch),
RCANFD_CERFL_ERR(~cerfl));
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
rx_state = txerr <= rxerr ? state : 0;
can_change_state(ndev, cf, tx_state, rx_state);
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
can_bus_off(dev);
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
can_bus_off(dev);
}
- if (likely(skb)) {
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (likely(skb))
netif_rx(skb);
- } else {
+ else
return -ENOMEM;
- }
return 0;
}
stats->rx_errors++;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
break;
}
- /* driver/net/can/dev.c:can_restart() takes in account error
- * messages in the RX stats. Doing the same here for
- * consistency.
- */
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += CAN_ERR_DLC;
-
if (cf) {
if (cf->data[1])
cf->can_id |= CAN_ERR_CRTL;
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
struct net_device *netdev = priv->netdev;
struct can_frame *cf;
struct sk_buff *skb;
- struct net_device_stats *stats;
enum can_state new_state, old_state;
old_state = priv->can.state;
cf->data[6] = bec->txerr;
cf->data[7] = bec->rxerr;
- stats = &netdev->stats;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
priv->bec.txerr = bec.txerr;
}
stats->tx_errors++;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
if (skb) {
cf->can_id |= CAN_ERR_RESTARTED;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
} else {
netdev_err(priv->netdev,
cf->data[6] = es->txerr;
cf->data[7] = es->rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
&hwts->hwtstamp);
}
- mc->netdev->stats.rx_packets++;
- mc->netdev->stats.rx_bytes += cf->len;
netif_rx(skb);
return 0;
if (!skb)
return -ENOMEM;
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += cf->len;
-
peak_usb_netif_rx_64(skb, le32_to_cpu(sm->ts_low),
le32_to_cpu(sm->ts_high));
hwts = skb_hwtstamps(skb);
peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += can_frame->len;
netif_rx(skb);
return 0;
memcpy(cf->data, m->msg.can_msg.data, cf->len);
/* don't count error frames as real packets */
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (!(cf->can_id & CAN_ERR_FLAG)) {
+ stats->rx_packets++;
+ stats->rx_bytes += cf->len;
+ }
/* pass it to Linux */
netif_rx(skb);
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
xcan_set_error_state(ndev, new_state, skb ? cf : NULL);
- if (skb) {
- struct net_device_stats *stats = &ndev->stats;
-
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (skb)
netif_rx(skb);
- }
}
}
if (skb) {
skb_cf->can_id |= cf.can_id;
memcpy(skb_cf->data, cf.data, CAN_ERR_DLC);
- stats->rx_packets++;
- stats->rx_bytes += CAN_ERR_DLC;
netif_rx(skb);
}
}
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