drivers/net/dsa/sja1105/sja1105_vl.c

Source file repositories/reference/linux-study-clean/drivers/net/dsa/sja1105/sja1105_vl.c

File Facts

System
Linux kernel
Corpus path
drivers/net/dsa/sja1105/sja1105_vl.c
Extension
.c
Size
23768 bytes
Lines
801
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

list_for_each_entry(p, &gating_cfg->entries, list) {
			if (p->interval == e->interval) {
				NL_SET_ERR_MSG_MOD(extack,
						   "Gate conflict");
				rc = -EBUSY;
				goto err;
			}

			if (e->interval < p->interval)
				break;
		}
		list_add(&e->list, p->list.prev);
	}

	gating_cfg->num_entries++;

	return 0;
err:
	kfree(e);
	return rc;
}

/* The gate entries contain absolute times in their e->interval field. Convert
 * that to proper intervals (i.e. "0, 5, 10, 15" to "5, 5, 5, 5").
 */
static void
sja1105_gating_cfg_time_to_interval(struct sja1105_gating_config *gating_cfg,
				    u64 cycle_time)
{
	struct sja1105_gate_entry *last_e;
	struct sja1105_gate_entry *e;
	struct list_head *prev;

	list_for_each_entry(e, &gating_cfg->entries, list) {
		struct sja1105_gate_entry *p;

		prev = e->list.prev;

		if (prev == &gating_cfg->entries)
			continue;

		p = list_entry(prev, struct sja1105_gate_entry, list);
		p->interval = e->interval - p->interval;
	}
	last_e = list_last_entry(&gating_cfg->entries,
				 struct sja1105_gate_entry, list);
	last_e->interval = cycle_time - last_e->interval;
}

static void sja1105_free_gating_config(struct sja1105_gating_config *gating_cfg)
{
	struct sja1105_gate_entry *e, *n;

	list_for_each_entry_safe(e, n, &gating_cfg->entries, list) {
		list_del(&e->list);
		kfree(e);
	}
}

static int sja1105_compose_gating_subschedule(struct sja1105_private *priv,
					      struct netlink_ext_ack *extack)
{
	struct sja1105_gating_config *gating_cfg = &priv->tas_data.gating_cfg;
	struct sja1105_rule *rule;
	s64 max_cycle_time = 0;
	s64 its_base_time = 0;
	int i, rc = 0;

	sja1105_free_gating_config(gating_cfg);

	list_for_each_entry(rule, &priv->flow_block.rules, list) {
		if (rule->type != SJA1105_RULE_VL)
			continue;
		if (rule->vl.type != SJA1105_VL_TIME_TRIGGERED)
			continue;

		if (max_cycle_time < rule->vl.cycle_time) {
			max_cycle_time = rule->vl.cycle_time;
			its_base_time = rule->vl.base_time;
		}
	}

	if (!max_cycle_time)
		return 0;

	dev_dbg(priv->ds->dev, "max_cycle_time %lld its_base_time %lld\n",
		max_cycle_time, its_base_time);

	gating_cfg->base_time = its_base_time;
	gating_cfg->cycle_time = max_cycle_time;

Annotation

Implementation Notes