drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
Extension
.c
Size
350424 bytes
Lines
12461
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct net_device_ops ixgbe_netdev_ops;

static bool netif_is_ixgbe(struct net_device *dev)
{
	return dev && (dev->netdev_ops == &ixgbe_netdev_ops);
}

static int ixgbe_read_pci_cfg_word_parent(struct ixgbe_adapter *adapter,
					  u32 reg, u16 *value)
{
	struct pci_dev *parent_dev;
	struct pci_bus *parent_bus;

	parent_bus = adapter->pdev->bus->parent;
	if (!parent_bus)
		return -1;

	parent_dev = parent_bus->self;
	if (!parent_dev)
		return -1;

	if (!pci_is_pcie(parent_dev))
		return -1;

	pcie_capability_read_word(parent_dev, reg, value);
	if (*value == IXGBE_FAILED_READ_CFG_WORD &&
	    ixgbe_check_cfg_remove(&adapter->hw, parent_dev))
		return -1;
	return 0;
}

static int ixgbe_get_parent_bus_info(struct ixgbe_adapter *adapter)
{
	struct ixgbe_hw *hw = &adapter->hw;
	u16 link_status = 0;
	int err;

	hw->bus.type = ixgbe_bus_type_pci_express;

	/* Get the negotiated link width and speed from PCI config space of the
	 * parent, as this device is behind a switch
	 */
	err = ixgbe_read_pci_cfg_word_parent(adapter, 18, &link_status);

	/* assume caller will handle error case */
	if (err)
		return err;

	hw->bus.width = ixgbe_convert_bus_width(link_status);
	hw->bus.speed = ixgbe_convert_bus_speed(link_status);

	return 0;
}

/**
 * ixgbe_pcie_from_parent - Determine whether PCIe info should come from parent
 * @hw: hw specific details
 *
 * This function is used by probe to determine whether a device's PCI-Express
 * bandwidth details should be gathered from the parent bus instead of from the
 * device. Used to ensure that various locations all have the correct device ID
 * checks.
 *
 * Return: true if information should be collected from the parent bus, false
 *         otherwise
 */
static bool ixgbe_pcie_from_parent(struct ixgbe_hw *hw)
{
	switch (hw->device_id) {
	case IXGBE_DEV_ID_82599_SFP_SF_QP:
	case IXGBE_DEV_ID_82599_QSFP_SF_QP:
		return true;
	default:
		return false;
	}
}

static void ixgbe_check_minimum_link(struct ixgbe_adapter *adapter,
				     int expected_gts)
{
	struct ixgbe_hw *hw = &adapter->hw;
	struct pci_dev *pdev;

	/* Some devices are not connected over PCIe and thus do not negotiate
	 * speed. These devices do not have valid bus info, and thus any report
	 * we generate may not be correct.
	 */
	if (hw->bus.type == ixgbe_bus_type_internal)
		return;

Annotation

Implementation Notes