can: add CAN_ERR_CNT flag to notify availability of error counter

Add a dedicated flag in uapi/linux/can/error.h to notify the userland
that fields data[6] and data[7] of the CAN error frame were
respectively populated with the tx and rx error counters.

For all driver tree-wide, set up this flags whenever needed.

Link: https://lore.kernel.org/all/20220719143550.3681-12-mailhol.vincent@wanadoo.frSigned-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/c_can/c_can_main.c

@@ -952,14 +952,14 @@ static int c_can_handle_state_change(struct net_device *dev,
 
 	switch (error_type) {
 	case C_CAN_NO_ERROR:
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = CAN_ERR_CRTL_ACTIVE;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 		break;
 	case C_CAN_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -969,7 +969,7 @@ static int c_can_handle_state_change(struct net_device *dev,
 		break;
 	case C_CAN_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		if (rx_err_passive)
 			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
 		if (bec.txerr > 127)

drivers/net/can/cc770/cc770.c

@@ -512,6 +512,7 @@ static int cc770_err(struct net_device *dev, u8 status)
 
 	/* Use extended functions of the CC770 */
 	if (priv->control_normal_mode & CTRL_EAF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = cc770_read_reg(priv, tx_error_counter);
 		cf->data[7] = cc770_read_reg(priv, rx_error_counter);
 	}

drivers/net/can/ctucanfd/ctucanfd_base.c

@@ -847,7 +847,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 		case CAN_STATE_ERROR_PASSIVE:
 			priv->can.can_stats.error_passive++;
 			if (skb) {
-				cf->can_id |= CAN_ERR_CRTL;
+				cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 				cf->data[1] = (bec.rxerr > 127) ?
 						CAN_ERR_CRTL_RX_PASSIVE :
 						CAN_ERR_CRTL_TX_PASSIVE;
@@ -858,7 +858,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 		case CAN_STATE_ERROR_WARNING:
 			priv->can.can_stats.error_warning++;
 			if (skb) {
-				cf->can_id |= CAN_ERR_CRTL;
+				cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 				cf->data[1] |= (bec.txerr > bec.rxerr) ?
 					CAN_ERR_CRTL_TX_WARNING :
 					CAN_ERR_CRTL_RX_WARNING;
@@ -867,6 +867,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 			}
 			break;
 		case CAN_STATE_ERROR_ACTIVE:
+			cf->can_id |= CAN_ERR_CNT;
 			cf->data[1] = CAN_ERR_CRTL_ACTIVE;
 			cf->data[6] = bec.txerr;
 			cf->data[7] = bec.rxerr;

drivers/net/can/grcan.c

@@ -671,6 +671,7 @@ static void grcan_err(struct net_device *dev, u32 sources, u32 status)
 				/* There are no others at this point */
 				break;
 			}
+			cf.can_id |= CAN_ERR_CNT;
 			cf.data[6] = txerr;
 			cf.data[7] = rxerr;
 			priv->can.state = state;

drivers/net/can/ifi_canfd/ifi_canfd.c

@@ -492,7 +492,7 @@ static int ifi_canfd_handle_state_change(struct net_device *ndev,
 	switch (new_state) {
 	case CAN_STATE_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -501,7 +501,7 @@ static int ifi_canfd_handle_state_change(struct net_device *ndev,
 		break;
 	case CAN_STATE_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
 		if (bec.txerr > 127)
 			cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;

drivers/net/can/janz-ican3.c

@@ -1127,7 +1127,7 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 	/* bus error interrupt */
 	if (isrc == CEVTIND_BEI) {
 		mod->can.can_stats.bus_error++;
-		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR | CAN_ERR_CNT;
 
 		switch (ecc & ECC_MASK) {
 		case ECC_BIT:
@@ -1153,7 +1153,7 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 
 	if (state != mod->can.state && (state == CAN_STATE_ERROR_WARNING ||
 					state == CAN_STATE_ERROR_PASSIVE)) {
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		if (state == CAN_STATE_ERROR_WARNING) {
 			mod->can.can_stats.error_warning++;
 			cf->data[1] = (txerr > rxerr) ?

drivers/net/can/kvaser_pciefd.c

@@ -1306,7 +1306,7 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
 	shhwtstamps->hwtstamp =
 		ns_to_ktime(div_u64(p->timestamp * 1000,
 				    can->kv_pcie->freq_to_ticks_div));
-	cf->can_id |= CAN_ERR_BUSERROR;
+	cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
 
 	cf->data[6] = bec.txerr;
 	cf->data[7] = bec.rxerr;

drivers/net/can/m_can/m_can.c

@@ -741,7 +741,7 @@ static int m_can_handle_state_change(struct net_device *dev,
 	switch (new_state) {
 	case CAN_STATE_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -750,7 +750,7 @@ static int m_can_handle_state_change(struct net_device *dev,
 		break;
 	case CAN_STATE_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		ecr = m_can_read(cdev, M_CAN_ECR);
 		if (ecr & ECR_RP)
 			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;

drivers/net/can/pch_can.c

@@ -497,6 +497,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		priv->can.can_stats.bus_off++;
 		can_bus_off(ndev);
 	} else {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = errc & PCH_TEC;
 		cf->data[7] = (errc & PCH_REC) >> 8;
 	}

drivers/net/can/peak_canfd/peak_canfd.c

@@ -373,7 +373,7 @@ static int pucan_handle_status(struct peak_canfd_priv *priv,
 		priv->can.state = CAN_STATE_ERROR_PASSIVE;
 		priv->can.can_stats.error_passive++;
 		if (skb) {
-			cf->can_id |= CAN_ERR_CRTL;
+			cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 			cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
 					CAN_ERR_CRTL_TX_PASSIVE :
 					CAN_ERR_CRTL_RX_PASSIVE;
@@ -386,7 +386,7 @@ static int pucan_handle_status(struct peak_canfd_priv *priv,
 		priv->can.state = CAN_STATE_ERROR_WARNING;
 		priv->can.can_stats.error_warning++;
 		if (skb) {
-			cf->can_id |= CAN_ERR_CRTL;
+			cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 			cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
 					CAN_ERR_CRTL_TX_WARNING :
 					CAN_ERR_CRTL_RX_WARNING;
@@ -430,7 +430,7 @@ static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
 		return -ENOMEM;
 	}
 
-	cf->can_id |= CAN_ERR_CRTL;
+	cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 
 	cf->data[6] = priv->bec.txerr;

drivers/net/can/rcar/rcar_can.c

@@ -334,6 +334,7 @@ static void rcar_can_error(struct net_device *ndev)
 		if (skb)
 			cf->can_id |= CAN_ERR_BUSOFF;
 	} else if (skb) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

drivers/net/can/rcar/rcar_canfd.c

@@ -1052,7 +1052,7 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
 		netdev_dbg(ndev, "Error warning interrupt\n");
 		priv->can.state = CAN_STATE_ERROR_WARNING;
 		priv->can.can_stats.error_warning++;
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
 		cf->data[6] = txerr;
@@ -1062,7 +1062,7 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
 		netdev_dbg(ndev, "Error passive interrupt\n");
 		priv->can.state = CAN_STATE_ERROR_PASSIVE;
 		priv->can.can_stats.error_passive++;
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE :
 			CAN_ERR_CRTL_RX_PASSIVE;
 		cf->data[6] = txerr;

drivers/net/can/sja1000/sja1000.c

@@ -426,6 +426,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
 	if (state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

drivers/net/can/slcan/slcan-core.c

@@ -314,6 +314,7 @@ static void slc_bump_state(struct slcan *sl)
 	if (state == CAN_STATE_BUS_OFF) {
 		can_bus_off(dev);
 	} else if (skb) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

drivers/net/can/spi/hi311x.c

@@ -680,6 +680,7 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 					break;
 				}
 			} else {
+				cf->can_id |= CAN_ERR_CNT;
 				cf->data[6] = txerr;
 				cf->data[7] = rxerr;
 			}

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

@@ -1099,6 +1099,7 @@ static int mcp251xfd_handle_cerrif(struct mcp251xfd_priv *priv)
 		err = mcp251xfd_get_berr_counter(priv->ndev, &bec);
 		if (err)
 			return err;
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 	}

drivers/net/can/sun4i_can.c

@@ -566,6 +566,7 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
 	if (skb && state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

drivers/net/can/ti_hecc.c

@@ -662,6 +662,7 @@ static void ti_hecc_change_state(struct net_device *ndev,
 	can_change_state(priv->ndev, cf, tx_state, rx_state);
 
 	if (max(tx_state, rx_state) != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = hecc_read(priv, HECC_CANTEC);
 		cf->data[7] = hecc_read(priv, HECC_CANREC);
 	}

drivers/net/can/usb/esd_usb.c

@@ -265,7 +265,8 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 			priv->can.can_stats.bus_error++;
 			stats->rx_errors++;
 
-			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR |
+				      CAN_ERR_CNT;
 
 			switch (ecc & SJA1000_ECC_MASK) {
 			case SJA1000_ECC_BIT:

drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c

@@ -918,6 +918,7 @@ static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 		priv->can.can_stats.restarts++;
 
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec->txerr;
 		cf->data[7] = bec->rxerr;
 	}
@@ -1072,6 +1073,7 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
 
 	cf->can_id |= CAN_ERR_BUSERROR;
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 	}

drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c

@@ -854,6 +854,7 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 	}
 
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = es->txerr;
 		cf->data[7] = es->rxerr;
 	}

drivers/net/can/usb/peak_usb/pcan_usb.c

@@ -506,6 +506,7 @@ static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
 			/* Supply TX/RX error counters in case of
 			 * controller error.
 			 */
+			cf->can_id = CAN_ERR_CNT;
 			cf->data[6] = mc->pdev->bec.txerr;
 			cf->data[7] = mc->pdev->bec.rxerr;
 		}

drivers/net/can/usb/usb_8dev.c

@@ -439,6 +439,7 @@ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
 	if (rx_errors)
 		stats->rx_errors++;
 	if (priv->can.state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

drivers/net/can/xilinx_can.c

@@ -965,6 +965,7 @@ static void xcan_set_error_state(struct net_device *ndev,
 	can_change_state(ndev, cf, tx_state, rx_state);
 
 	if (cf) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}

include/uapi/linux/can/error.h

@@ -57,6 +57,8 @@
 #define CAN_ERR_BUSOFF       0x00000040U /* bus off */
 #define CAN_ERR_BUSERROR     0x00000080U /* bus error (may flood!) */
 #define CAN_ERR_RESTARTED    0x00000100U /* controller restarted */
+#define CAN_ERR_CNT          0x00000200U /* TX error counter / data[6] */
+					 /* RX error counter / data[7] */
 
 /* arbitration lost in bit ... / data[0] */
 #define CAN_ERR_LOSTARB_UNSPEC   0x00 /* unspecified */