[RFC PATCH v2 3/6] can: dev: add helpers to setup an error frame

[Dario Binacchi <dario.binacchi@amarulasolutions.com>]

These helpers can prevent errors and code duplication when setting up a
CAN error frame.

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

---

Changes in v2:
- Replace macros with static inline functions
- Update the commit message

 include/linux/can/dev.h | 46 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 0977656b366d..1b09d30dae32 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -168,6 +168,52 @@ static inline bool can_dev_dropped_skb(struct net_device *dev, struct sk_buff *s
 	return can_dropped_invalid_skb(dev, skb);
 }
 
+static inline void can_frame_error_init(struct can_frame *cf)
+{
+	if (cf)
+		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+}
+
+static inline void can_frame_set_err_bit0(struct can_frame *cf)
+{
+	if (cf)
+		cf->data[2] |= CAN_ERR_PROT_BIT0;
+}
+
+static inline void can_frame_set_err_bit1(struct can_frame *cf)
+{
+	if (cf)
+		cf->data[2] |= CAN_ERR_PROT_BIT1;
+}
+
+static inline void can_frame_set_err_ack(struct can_frame *cf)
+{
+	if (cf) {
+		cf->can_id |= CAN_ERR_ACK;
+		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
+	}
+}
+
+static inline void can_frame_set_err_crc(struct can_frame *cf)
+{
+	if (cf) {
+		cf->data[2] |= CAN_ERR_PROT_BIT;
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
+	}
+}
+
+static inline void can_frame_set_err_form(struct can_frame *cf)
+{
+	if (cf)
+		cf->data[2] |= CAN_ERR_PROT_FORM;
+}
+
+static inline void can_frame_set_err_stuff(struct can_frame *cf)
+{
+	if (cf)
+		cf->data[2] |= CAN_ERR_PROT_STUFF;
+}
+
 void can_setup(struct net_device *dev);
 
 struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
-- 
2.43.0