linux-kernel - [RFC PATCH v2 1/6] can: dev: add generic function can_update_bus_error

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Message-ID: <20241029084525.2858224-2-dario.binacchi@amarulasolutions.com>
Date: Tue, 29 Oct 2024 09:44:45 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gal Pressman <gal@...dia.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Kory Maincent <kory.maincent@...tlin.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Paolo Abeni <pabeni@...hat.com>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Shannon Nelson <shannon.nelson@....com>,
	Simon Horman <horms@...nel.org>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	linux-can@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [RFC PATCH v2 1/6] can: dev: add generic function can_update_bus_error_stats()

The function aims to generalize the statistics update by centralizing
the related code, thus avoiding code duplication.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

(no changes since v1)

 drivers/net/can/dev/dev.c | 30 ++++++++++++++++++++++++++++++
 include/linux/can/dev.h   |  1 +
 2 files changed, 31 insertions(+)

diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c
index 6792c14fd7eb..0a3b1aad405b 100644
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -16,6 +16,36 @@
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
 
+void can_update_bus_error_stats(struct net_device *dev, struct can_frame *cf)
+{
+	struct can_priv *priv = netdev_priv(dev);
+	bool rx_errors = false, tx_errors = false;
+
+	if (!cf || !(cf->can_id & (CAN_ERR_PROT | CAN_ERR_BUSERROR)))
+		return;
+
+	priv = netdev_priv(dev);
+	priv->can_stats.bus_error++;
+
+	if ((cf->can_id & CAN_ERR_ACK) && cf->data[3] == CAN_ERR_PROT_LOC_ACK)
+		tx_errors = true;
+	else if (cf->data[2] & (CAN_ERR_PROT_BIT1 | CAN_ERR_PROT_BIT0))
+		tx_errors = true;
+
+	if (cf->data[2] & (CAN_ERR_PROT_FORM | CAN_ERR_PROT_STUFF))
+		rx_errors = true;
+	else if ((cf->data[2] & CAN_ERR_PROT_BIT) &&
+		 (cf->data[3] == CAN_ERR_PROT_LOC_CRC_SEQ))
+		rx_errors = true;
+
+	if (rx_errors)
+		dev->stats.rx_errors++;
+
+	if (tx_errors)
+		dev->stats.tx_errors++;
+}
+EXPORT_SYMBOL_GPL(can_update_bus_error_stats);
+
 static void can_update_state_error_stats(struct net_device *dev,
 					 enum can_state new_state)
 {
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 23492213ea35..0977656b366d 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -201,6 +201,7 @@ void can_state_get_by_berr_counter(const struct net_device *dev,
 				   enum can_state *rx_state);
 void can_change_state(struct net_device *dev, struct can_frame *cf,
 		      enum can_state tx_state, enum can_state rx_state);
+void can_update_bus_error_stats(struct net_device *dev, struct can_frame *cf);
 
 #ifdef CONFIG_OF
 void of_can_transceiver(struct net_device *dev);
-- 
2.43.0