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drivers: can: mcan: do not iterate all filter elements to find free one

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There is no need for iterating all the Bosch M_CAN filter elements in
Message RAM in order to find a free filter as the driver already keeps
track of assigned filters.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2023-05-26 14:54:42 +02:00 • committed by Anas Nashif
commit 5f67426b93
1 changed files with 26 additions and 56 deletions
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82
drivers/can/can_mcan.c
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@ -944,31 +944,6 @@ unlock:
return err;
}
static int can_mcan_get_free_std(const struct device *dev)
{
const struct can_mcan_config *config = dev->config;
const struct can_mcan_callbacks *cbs = config->callbacks;
struct can_mcan_std_filter filter;
int err;
int i;
for (i = 0; i < cbs->num_std; ++i) {
err = can_mcan_read_mram(dev, config->mram_offsets[CAN_MCAN_MRAM_CFG_STD_FILTER] +
i * sizeof(struct can_mcan_std_filter), &filter,
sizeof(struct can_mcan_std_filter));
if (err != 0) {
LOG_ERR("failed to read std filter (err %d)", err);
return err;
}
if (filter.sfce == CAN_MCAN_FCE_DISABLE) {
return i;
}
}
return -ENOSPC;
}
int can_mcan_get_max_filters(const struct device *dev, bool ide)
{
const struct can_mcan_config *config = dev->config;
@ -997,13 +972,20 @@ int can_mcan_add_rx_filter_std(const struct device *dev, can_rx_callback_t callb
.id2 = filter->mask,
.sft = CAN_MCAN_SFT_MASKED
};
int filter_id;
int filter_id = -ENOSPC;
int err;
int i;
k_mutex_lock(&data->lock, K_FOREVER);
filter_id = can_mcan_get_free_std(dev);
if (filter_id < 0) {
for (i = 0; i < cbs->num_std; i++) {
if (cbs->std[i].function == NULL) {
filter_id = i;
break;
}
}
if (filter_id == -ENOSPC) {
LOG_WRN("No free standard id filter left");
k_mutex_unlock(&data->lock);
return -ENOSPC;
@ -1032,31 +1014,6 @@ int can_mcan_add_rx_filter_std(const struct device *dev, can_rx_callback_t callb
return filter_id;
}
static int can_mcan_get_free_ext(const struct device *dev)
{
const struct can_mcan_config *config = dev->config;
const struct can_mcan_callbacks *cbs = config->callbacks;
struct can_mcan_ext_filter filter;
int err;
int i;
for (i = 0; i < cbs->num_ext; ++i) {
err = can_mcan_read_mram(dev, config->mram_offsets[CAN_MCAN_MRAM_CFG_EXT_FILTER] +
i * sizeof(struct can_mcan_ext_filter), &filter,
sizeof(struct can_mcan_ext_filter));
if (err != 0) {
LOG_ERR("failed to read ext filter (err %d)", err);
return err;
}
if (filter.efce == CAN_MCAN_FCE_DISABLE) {
return i;
}
}
return -ENOSPC;
}
static int can_mcan_add_rx_filter_ext(const struct device *dev, can_rx_callback_t callback,
void *user_data, const struct can_filter *filter)
{
@ -1068,13 +1025,20 @@ static int can_mcan_add_rx_filter_ext(const struct device *dev, can_rx_callback_
.id1 = filter->id,
.eft = CAN_MCAN_EFT_MASKED
};
int filter_id;
int filter_id = -ENOSPC;
int err;
int i;
k_mutex_lock(&data->lock, K_FOREVER);
filter_id = can_mcan_get_free_ext(dev);
if (filter_id < 0) {
for (i = 0; i < cbs->num_ext; i++) {
if (cbs->ext[i].function == NULL) {
filter_id = i;
break;
}
}
if (filter_id == -ENOSPC) {
LOG_WRN("No free extended id filter left");
k_mutex_unlock(&data->lock);
return -ENOSPC;
@ -1153,6 +1117,9 @@ void can_mcan_remove_rx_filter(const struct device *dev, int filter_id)
return;
}
cbs->ext[filter_id].function = NULL;
cbs->ext[filter_id].user_data = NULL;
err = can_mcan_clear_mram(dev, config->mram_offsets[CAN_MCAN_MRAM_CFG_EXT_FILTER] +
filter_id * sizeof(struct can_mcan_ext_filter),
sizeof(struct can_mcan_ext_filter));
@ -1160,6 +1127,9 @@ void can_mcan_remove_rx_filter(const struct device *dev, int filter_id)
LOG_ERR("failed to clear ext filter element (err %d)", err);
}
} else {
cbs->std[filter_id].function = NULL;
cbs->std[filter_id].user_data = NULL;
err = can_mcan_clear_mram(dev, config->mram_offsets[CAN_MCAN_MRAM_CFG_STD_FILTER] +
filter_id * sizeof(struct can_mcan_std_filter),
sizeof(struct can_mcan_std_filter));