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can: netlink: add can_data_bittiming_get_size()

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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@kernel.org>
Link: https://patch.msgid.link/20250923-canxl-netlink-prep-v4-13-e720d28f66fe@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol
2025-09-24 17:09:46 +02:00
committed by Marc Kleine-Budde
parent 63888a5780
commit d5f45ef88b
1 changed files with 20 additions and 9 deletions
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drivers/net/can/dev/netlink.c
+20 -9
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@@ -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;
}