drivers/net/ethernet/engleder/tsnep_rxnfc.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/engleder/tsnep_rxnfc.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/engleder/tsnep_rxnfc.c
Extension
.c
Size
6825 bytes
Lines
308
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

if (count == cmd->rule_cnt) {
			mutex_unlock(&adapter->rxnfc_lock);

			return -EMSGSIZE;
		}

		rule_locs[count] = rule->location;
		count++;
	}

	mutex_unlock(&adapter->rxnfc_lock);

	cmd->rule_cnt = count;

	return 0;
}

static int tsnep_rxnfc_find_location(struct tsnep_adapter *adapter)
{
	struct tsnep_rxnfc_rule *tmp;
	int location = 0;

	list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
		if (tmp->location == location)
			location++;
		else
			return location;
	}

	if (location >= adapter->rxnfc_max)
		return -ENOSPC;

	return location;
}

static void tsnep_rxnfc_init_rule(struct tsnep_rxnfc_rule *rule,
				  const struct ethtool_rx_flow_spec *fsp)
{
	INIT_LIST_HEAD(&rule->list);

	rule->queue_index = fsp->ring_cookie;
	rule->location = fsp->location;

	rule->filter.type = TSNEP_RXNFC_ETHER_TYPE;
	rule->filter.ether_type = ntohs(fsp->h_u.ether_spec.h_proto);
}

static int tsnep_rxnfc_check_rule(struct tsnep_adapter *adapter,
				  struct tsnep_rxnfc_rule *rule)
{
	struct net_device *dev = adapter->netdev;
	struct tsnep_rxnfc_rule *tmp;

	list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
		if (!memcmp(&rule->filter, &tmp->filter, sizeof(rule->filter)) &&
		    tmp->location != rule->location) {
			netdev_dbg(dev, "rule already exists\n");

			return -EEXIST;
		}
	}

	return 0;
}

int tsnep_rxnfc_add_rule(struct tsnep_adapter *adapter,
			 struct ethtool_rxnfc *cmd)
{
	struct net_device *netdev = adapter->netdev;
	struct ethtool_rx_flow_spec *fsp =
		(struct ethtool_rx_flow_spec *)&cmd->fs;
	struct tsnep_rxnfc_rule *rule, *old_rule;
	int retval;

	/* only EtherType is supported */
	if (fsp->flow_type != ETHER_FLOW ||
	    !is_zero_ether_addr(fsp->m_u.ether_spec.h_dest) ||
	    !is_zero_ether_addr(fsp->m_u.ether_spec.h_source) ||
	    fsp->m_u.ether_spec.h_proto != ETHER_TYPE_FULL_MASK) {
		netdev_dbg(netdev, "only ethernet protocol is supported\n");

		return -EOPNOTSUPP;
	}

	if (fsp->ring_cookie >
	    (TSNEP_RX_ASSIGN_QUEUE_MASK >> TSNEP_RX_ASSIGN_QUEUE_SHIFT)) {
		netdev_dbg(netdev, "invalid action\n");

		return -EINVAL;
	}

Annotation

Implementation Notes