path: root/drivers/net/phy/sfp-bus.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/export.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/phylink.h>
#include <linux/property.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>

#include "sfp.h"

/**
 * struct sfp_bus - internal representation of a sfp bus
 */
struct sfp_bus {
	/* private: */
	struct kref kref;
	struct list_head node;
	const struct fwnode_handle *fwnode;

	const struct sfp_socket_ops *socket_ops;
	struct device *sfp_dev;
	struct sfp *sfp;

	const struct sfp_upstream_ops *upstream_ops;
	void *upstream;
	struct phy_device *phydev;

	bool registered;
	bool started;

	struct sfp_module_caps caps;
};

const struct sfp_module_caps *sfp_get_module_caps(struct sfp_bus *bus)
{
	return &bus->caps;
}
EXPORT_SYMBOL_GPL(sfp_get_module_caps);

static void sfp_module_parse_port(struct sfp_bus *bus,
				  const struct sfp_eeprom_id *id)
{
	int port;

	/* port is the physical connector, set this from the connector field. */
	switch (id->base.connector) {
	case SFF8024_CONNECTOR_SC:
	case SFF8024_CONNECTOR_FIBERJACK:
	case SFF8024_CONNECTOR_LC:
	case SFF8024_CONNECTOR_MT_RJ:
	case SFF8024_CONNECTOR_MU:
	case SFF8024_CONNECTOR_OPTICAL_PIGTAIL:
	case SFF8024_CONNECTOR_MPO_1X12:
	case SFF8024_CONNECTOR_MPO_2X16:
		port = PORT_FIBRE;
		break;

	case SFF8024_CONNECTOR_RJ45:
		port = PORT_TP;
		break;

	case SFF8024_CONNECTOR_COPPER_PIGTAIL:
		port = PORT_DA;
		break;

	case SFF8024_CONNECTOR_UNSPEC:
		if (id->base.e1000_base_t) {
			port = PORT_TP;
			break;
		}
		fallthrough;
	case SFF8024_CONNECTOR_SG: /* guess */
	case SFF8024_CONNECTOR_HSSDC_II:
	case SFF8024_CONNECTOR_NOSEPARATE:
	case SFF8024_CONNECTOR_MXC_2X16:
		port = PORT_OTHER;
		break;
	default:
		dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
			 id->base.connector);
		port = PORT_OTHER;
		break;
	}

	switch (port) {
	case PORT_FIBRE:
		phylink_set(bus->caps.link_modes, FIBRE);
		break;

	case PORT_TP:
		phylink_set(bus->caps.link_modes, TP);
		break;
	}

	bus->caps.port = port;
}

static void sfp_module_parse_may_have_phy(struct sfp_bus *bus,
					  const struct sfp_eeprom_id *id)
{
	if (id->base.e1000_base_t) {
		bus->caps.may_have_phy = true;
		return;
	}

	if (id->base.phys_id != SFF8024_ID_DWDM_SFP) {
		switch (id->base.extended_cc) {
		case SFF8024_ECC_10GBASE_T_SFI:
		case SFF8024_ECC_10GBASE_T_SR:
		case SFF8024_ECC_5GBASE_T:
		case SFF8024_ECC_2_5GBASE_T:
			bus->caps.may_have_phy = true;
			return;
		}
	}

	bus->caps.may_have_phy = false;
}

static void sfp_module_parse_support(struct sfp_bus *bus,
				     const struct sfp_eeprom_id *id)
{
	unsigned long *interfaces = bus->caps.interfaces;
	unsigned long *modes = bus->caps.link_modes;
	unsigned int br_min, br_nom, br_max;

	/* Decode the bitrate information to MBd */
	br_min = br_nom = br_max = 0;
	if (id->base.br_nominal) {
		if (id->base.br_nominal != 255) {
			br_nom = id->base.br_nominal * 100;
			br_min = br_nom - id->base.br_nominal * id->ext.br_min;
			br_max = br_nom + id->base.br_nominal * id->ext.br_max;
		} else if (id->ext.br_max) {
			br_nom = 250 * id->ext.br_max;
			br_max = br_nom + br_nom * id->ext.br_min / 100;
			br_min = br_nom - br_nom * id->ext.br_min / 100;
		}

		/* When using passive cables, in case neither BR,min nor BR,max
		 * are specified, set br_min to 0 as the nominal value is then
		 * used as the maximum.
		 */
		if (br_min == br_max && id->base.sfp_ct_passive)
			br_min = 0;
	}

	/* Set ethtool support from the compliance fields. */
	if (id->base.e10g_base_sr) {
		phylink_set(modes, 10000baseSR_Full);
		__set_bit(PHY_INTERFACE_MODE_10GBASER, interfaces);
	}
	if (id->base.e10g_base_lr) {
		phylink_set(modes, 10000baseLR_Full);
		__set_bit(PHY_INTERFACE_MODE_10GBASER, interfaces);
	}
	if (id->base.e10g_base_lrm) {
		phylink_set(modes, 10000baseLRM_Full);
		__set_bit(PHY_INTERFACE_MODE_10GBASER, interfaces);
	}
	if (id->base.e10g_base_er) {
		phylink_set(modes, 10000baseER_Full);
		__set_bit(PHY_INTERFACE_MODE_10GBASER, interfaces);