netdev - [PATCH net-next 41/48] can: netlink: add can_data_bittiming_get

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Message-ID: <20250925121332.848157-42-mkl@pengutronix.de>
Date: Thu, 25 Sep 2025 14:08:18 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Vincent Mailhol <mailhol@...nel.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 41/48] can: netlink: add can_data_bittiming_get_size()

From: Vincent Mailhol <mailhol@...nel.org>

Add the can_data_bittiming_get_size() function to factorise the logic
to retrieve the size of below data bittiming parameters:

  - data_bittiming
  - data_bittiming_const
  - data_bitrate_const
  - tdc parameters

This function will be reused later on for CAN XL.

Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
Link: https://patch.msgid.link/20250923-canxl-netlink-prep-v4-13-e720d28f66fe@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/dev/netlink.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c
index 3c0675877f5e..5d2b524daea9 100644
--- a/drivers/net/can/dev/netlink.c
+++ b/drivers/net/can/dev/netlink.c
@@ -504,6 +504,23 @@ static size_t can_tdc_get_size(struct data_bittiming_params *dbt_params,
 	return size;
 }
 
+static size_t can_data_bittiming_get_size(struct data_bittiming_params *dbt_params,
+					  u32 tdc_flags)
+{
+	size_t size = 0;
+
+	if (dbt_params->data_bittiming.bitrate)		/* IFLA_CAN_DATA_BITTIMING */
+		size += nla_total_size(sizeof(dbt_params->data_bittiming));
+	if (dbt_params->data_bittiming_const)		/* IFLA_CAN_DATA_BITTIMING_CONST */
+		size += nla_total_size(sizeof(*dbt_params->data_bittiming_const));
+	if (dbt_params->data_bitrate_const)		/* IFLA_CAN_DATA_BITRATE_CONST */
+		size += nla_total_size(sizeof(*dbt_params->data_bitrate_const) *
+				       dbt_params->data_bitrate_const_cnt);
+	size += can_tdc_get_size(dbt_params, tdc_flags);/* IFLA_CAN_TDC */
+
+	return size;
+}
+
 static size_t can_ctrlmode_ext_get_size(void)
 {
 	return nla_total_size(0) +		/* nest IFLA_CAN_CTRLMODE_EXT */
@@ -525,10 +542,6 @@ static size_t can_get_size(const struct net_device *dev)
 	size += nla_total_size(sizeof(u32));			/* IFLA_CAN_RESTART_MS */
 	if (priv->do_get_berr_counter)				/* IFLA_CAN_BERR_COUNTER */
 		size += nla_total_size(sizeof(struct can_berr_counter));
-	if (priv->fd.data_bittiming.bitrate)			/* IFLA_CAN_DATA_BITTIMING */
-		size += nla_total_size(sizeof(struct can_bittiming));
-	if (priv->fd.data_bittiming_const)			/* IFLA_CAN_DATA_BITTIMING_CONST */
-		size += nla_total_size(sizeof(struct can_bittiming_const));
 	if (priv->termination_const) {
 		size += nla_total_size(sizeof(priv->termination));		/* IFLA_CAN_TERMINATION */
 		size += nla_total_size(sizeof(*priv->termination_const) *	/* IFLA_CAN_TERMINATION_CONST */
@@ -537,14 +550,12 @@ static size_t can_get_size(const struct net_device *dev)
 	if (priv->bitrate_const)				/* IFLA_CAN_BITRATE_CONST */
 		size += nla_total_size(sizeof(*priv->bitrate_const) *
 				       priv->bitrate_const_cnt);
-	if (priv->fd.data_bitrate_const)			/* IFLA_CAN_DATA_BITRATE_CONST */
-		size += nla_total_size(sizeof(*priv->fd.data_bitrate_const) *
-				       priv->fd.data_bitrate_const_cnt);
 	size += sizeof(priv->bitrate_max);			/* IFLA_CAN_BITRATE_MAX */
-	size += can_tdc_get_size(&priv->fd,			/* IFLA_CAN_TDC */
-				 priv->ctrlmode & CAN_CTRLMODE_FD_TDC_MASK);
 	size += can_ctrlmode_ext_get_size();			/* IFLA_CAN_CTRLMODE_EXT */
 
+	size += can_data_bittiming_get_size(&priv->fd,
+					    priv->ctrlmode & CAN_CTRLMODE_FD_TDC_MASK);
+
 	return size;
 }
 
-- 
2.51.0