619 lines
16 KiB
C
619 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/export.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/phylink.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include "sfp.h"
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/**
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* struct sfp_bus - internal representation of a sfp bus
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*/
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struct sfp_bus {
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/* private: */
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struct kref kref;
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struct list_head node;
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struct fwnode_handle *fwnode;
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const struct sfp_socket_ops *socket_ops;
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struct device *sfp_dev;
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struct sfp *sfp;
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const struct sfp_upstream_ops *upstream_ops;
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void *upstream;
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struct phy_device *phydev;
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bool registered;
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bool started;
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};
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/**
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* sfp_parse_port() - Parse the EEPROM base ID, setting the port type
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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* @id: a pointer to the module's &struct sfp_eeprom_id
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* @support: optional pointer to an array of unsigned long for the
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* ethtool support mask
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*
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* Parse the EEPROM identification given in @id, and return one of
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* %PORT_TP, %PORT_FIBRE or %PORT_OTHER. If @support is non-%NULL,
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* also set the ethtool %ETHTOOL_LINK_MODE_xxx_BIT corresponding with
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* the connector type.
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*
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* If the port type is not known, returns %PORT_OTHER.
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*/
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int sfp_parse_port(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
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unsigned long *support)
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{
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int port;
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/* port is the physical connector, set this from the connector field. */
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switch (id->base.connector) {
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case SFP_CONNECTOR_SC:
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case SFP_CONNECTOR_FIBERJACK:
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case SFP_CONNECTOR_LC:
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case SFP_CONNECTOR_MT_RJ:
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case SFP_CONNECTOR_MU:
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case SFP_CONNECTOR_OPTICAL_PIGTAIL:
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port = PORT_FIBRE;
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break;
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case SFP_CONNECTOR_RJ45:
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port = PORT_TP;
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break;
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case SFP_CONNECTOR_COPPER_PIGTAIL:
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port = PORT_DA;
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break;
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case SFP_CONNECTOR_UNSPEC:
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if (id->base.e1000_base_t) {
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port = PORT_TP;
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break;
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}
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/* fallthrough */
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case SFP_CONNECTOR_SG: /* guess */
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case SFP_CONNECTOR_MPO_1X12:
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case SFP_CONNECTOR_MPO_2X16:
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case SFP_CONNECTOR_HSSDC_II:
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case SFP_CONNECTOR_NOSEPARATE:
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case SFP_CONNECTOR_MXC_2X16:
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port = PORT_OTHER;
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break;
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default:
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dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
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id->base.connector);
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port = PORT_OTHER;
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break;
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}
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if (support) {
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switch (port) {
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case PORT_FIBRE:
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phylink_set(support, FIBRE);
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break;
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case PORT_TP:
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phylink_set(support, TP);
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break;
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}
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}
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return port;
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}
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EXPORT_SYMBOL_GPL(sfp_parse_port);
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/**
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* sfp_parse_support() - Parse the eeprom id for supported link modes
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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* @id: a pointer to the module's &struct sfp_eeprom_id
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* @support: pointer to an array of unsigned long for the ethtool support mask
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*
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* Parse the EEPROM identification information and derive the supported
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* ethtool link modes for the module.
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*/
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void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
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unsigned long *support)
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{
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unsigned int br_min, br_nom, br_max;
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__ETHTOOL_DECLARE_LINK_MODE_MASK(modes) = { 0, };
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/* Decode the bitrate information to MBd */
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br_min = br_nom = br_max = 0;
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if (id->base.br_nominal) {
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if (id->base.br_nominal != 255) {
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br_nom = id->base.br_nominal * 100;
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br_min = br_nom - id->base.br_nominal * id->ext.br_min;
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br_max = br_nom + id->base.br_nominal * id->ext.br_max;
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} else if (id->ext.br_max) {
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br_nom = 250 * id->ext.br_max;
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br_max = br_nom + br_nom * id->ext.br_min / 100;
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br_min = br_nom - br_nom * id->ext.br_min / 100;
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}
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/* When using passive cables, in case neither BR,min nor BR,max
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* are specified, set br_min to 0 as the nominal value is then
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* used as the maximum.
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*/
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if (br_min == br_max && id->base.sfp_ct_passive)
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br_min = 0;
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}
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/* Set ethtool support from the compliance fields. */
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if (id->base.e10g_base_sr)
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phylink_set(modes, 10000baseSR_Full);
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if (id->base.e10g_base_lr)
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phylink_set(modes, 10000baseLR_Full);
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if (id->base.e10g_base_lrm)
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phylink_set(modes, 10000baseLRM_Full);
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if (id->base.e10g_base_er)
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phylink_set(modes, 10000baseER_Full);
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if (id->base.e1000_base_sx ||
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id->base.e1000_base_lx ||
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id->base.e1000_base_cx)
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phylink_set(modes, 1000baseX_Full);
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if (id->base.e1000_base_t) {
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phylink_set(modes, 1000baseT_Half);
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phylink_set(modes, 1000baseT_Full);
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}
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/* 1000Base-PX or 1000Base-BX10 */
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if ((id->base.e_base_px || id->base.e_base_bx10) &&
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br_min <= 1300 && br_max >= 1200)
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phylink_set(modes, 1000baseX_Full);
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/* For active or passive cables, select the link modes
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* based on the bit rates and the cable compliance bytes.
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*/
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if ((id->base.sfp_ct_passive || id->base.sfp_ct_active) && br_nom) {
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/* This may look odd, but some manufacturers use 12000MBd */
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if (br_min <= 12000 && br_max >= 10300)
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phylink_set(modes, 10000baseCR_Full);
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if (br_min <= 3200 && br_max >= 3100)
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phylink_set(modes, 2500baseX_Full);
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if (br_min <= 1300 && br_max >= 1200)
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phylink_set(modes, 1000baseX_Full);
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}
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if (id->base.sfp_ct_passive) {
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if (id->base.passive.sff8431_app_e)
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phylink_set(modes, 10000baseCR_Full);
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}
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if (id->base.sfp_ct_active) {
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if (id->base.active.sff8431_app_e ||
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id->base.active.sff8431_lim) {
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phylink_set(modes, 10000baseCR_Full);
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}
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}
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switch (id->base.extended_cc) {
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case 0x00: /* Unspecified */
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break;
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case 0x02: /* 100Gbase-SR4 or 25Gbase-SR */
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phylink_set(modes, 100000baseSR4_Full);
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phylink_set(modes, 25000baseSR_Full);
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break;
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case 0x03: /* 100Gbase-LR4 or 25Gbase-LR */
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case 0x04: /* 100Gbase-ER4 or 25Gbase-ER */
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phylink_set(modes, 100000baseLR4_ER4_Full);
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break;
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case 0x0b: /* 100Gbase-CR4 or 25Gbase-CR CA-L */
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case 0x0c: /* 25Gbase-CR CA-S */
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case 0x0d: /* 25Gbase-CR CA-N */
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phylink_set(modes, 100000baseCR4_Full);
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phylink_set(modes, 25000baseCR_Full);
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break;
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default:
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dev_warn(bus->sfp_dev,
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"Unknown/unsupported extended compliance code: 0x%02x\n",
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id->base.extended_cc);
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break;
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}
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/* For fibre channel SFP, derive possible BaseX modes */
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if (id->base.fc_speed_100 ||
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id->base.fc_speed_200 ||
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id->base.fc_speed_400) {
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if (id->base.br_nominal >= 31)
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phylink_set(modes, 2500baseX_Full);
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if (id->base.br_nominal >= 12)
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phylink_set(modes, 1000baseX_Full);
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}
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/* If we haven't discovered any modes that this module supports, try
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* the encoding and bitrate to determine supported modes. Some BiDi
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* modules (eg, 1310nm/1550nm) are not 1000BASE-BX compliant due to
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* the differing wavelengths, so do not set any transceiver bits.
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*/
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if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS)) {
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/* If the encoding and bit rate allows 1000baseX */
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if (id->base.encoding == SFP_ENCODING_8B10B && br_nom &&
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br_min <= 1300 && br_max >= 1200)
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phylink_set(modes, 1000baseX_Full);
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}
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bitmap_or(support, support, modes, __ETHTOOL_LINK_MODE_MASK_NBITS);
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phylink_set(support, Autoneg);
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phylink_set(support, Pause);
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phylink_set(support, Asym_Pause);
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}
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EXPORT_SYMBOL_GPL(sfp_parse_support);
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/**
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* sfp_select_interface() - Select appropriate phy_interface_t mode
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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* @id: a pointer to the module's &struct sfp_eeprom_id
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* @link_modes: ethtool link modes mask
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*
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* Derive the phy_interface_t mode for the information found in the
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* module's identifying EEPROM and the link modes mask. There is no
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* standard or defined way to derive this information, so we decide
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* based upon the link mode mask.
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*/
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phy_interface_t sfp_select_interface(struct sfp_bus *bus,
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const struct sfp_eeprom_id *id,
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unsigned long *link_modes)
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{
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if (phylink_test(link_modes, 10000baseCR_Full) ||
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phylink_test(link_modes, 10000baseSR_Full) ||
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phylink_test(link_modes, 10000baseLR_Full) ||
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phylink_test(link_modes, 10000baseLRM_Full) ||
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phylink_test(link_modes, 10000baseER_Full))
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return PHY_INTERFACE_MODE_10GKR;
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if (phylink_test(link_modes, 2500baseX_Full))
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return PHY_INTERFACE_MODE_2500BASEX;
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if (id->base.e1000_base_t ||
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id->base.e100_base_lx ||
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id->base.e100_base_fx)
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return PHY_INTERFACE_MODE_SGMII;
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if (phylink_test(link_modes, 1000baseX_Full))
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return PHY_INTERFACE_MODE_1000BASEX;
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dev_warn(bus->sfp_dev, "Unable to ascertain link mode\n");
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return PHY_INTERFACE_MODE_NA;
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}
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EXPORT_SYMBOL_GPL(sfp_select_interface);
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static LIST_HEAD(sfp_buses);
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static DEFINE_MUTEX(sfp_mutex);
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static const struct sfp_upstream_ops *sfp_get_upstream_ops(struct sfp_bus *bus)
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{
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return bus->registered ? bus->upstream_ops : NULL;
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}
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static struct sfp_bus *sfp_bus_get(struct fwnode_handle *fwnode)
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{
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struct sfp_bus *sfp, *new, *found = NULL;
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new = kzalloc(sizeof(*new), GFP_KERNEL);
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mutex_lock(&sfp_mutex);
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list_for_each_entry(sfp, &sfp_buses, node) {
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if (sfp->fwnode == fwnode) {
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kref_get(&sfp->kref);
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found = sfp;
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break;
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}
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}
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if (!found && new) {
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kref_init(&new->kref);
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new->fwnode = fwnode;
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list_add(&new->node, &sfp_buses);
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found = new;
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new = NULL;
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}
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mutex_unlock(&sfp_mutex);
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kfree(new);
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return found;
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}
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static void sfp_bus_release(struct kref *kref)
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{
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struct sfp_bus *bus = container_of(kref, struct sfp_bus, kref);
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list_del(&bus->node);
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mutex_unlock(&sfp_mutex);
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kfree(bus);
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}
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static void sfp_bus_put(struct sfp_bus *bus)
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{
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kref_put_mutex(&bus->kref, sfp_bus_release, &sfp_mutex);
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}
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static int sfp_register_bus(struct sfp_bus *bus)
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{
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const struct sfp_upstream_ops *ops = bus->upstream_ops;
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int ret;
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if (ops) {
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if (ops->link_down)
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ops->link_down(bus->upstream);
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if (ops->connect_phy && bus->phydev) {
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ret = ops->connect_phy(bus->upstream, bus->phydev);
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if (ret)
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return ret;
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}
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}
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bus->socket_ops->attach(bus->sfp);
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if (bus->started)
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bus->socket_ops->start(bus->sfp);
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bus->upstream_ops->attach(bus->upstream, bus);
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bus->registered = true;
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return 0;
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}
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static void sfp_unregister_bus(struct sfp_bus *bus)
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{
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const struct sfp_upstream_ops *ops = bus->upstream_ops;
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if (bus->registered) {
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bus->upstream_ops->detach(bus->upstream, bus);
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if (bus->started)
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bus->socket_ops->stop(bus->sfp);
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bus->socket_ops->detach(bus->sfp);
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if (bus->phydev && ops && ops->disconnect_phy)
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ops->disconnect_phy(bus->upstream);
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}
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bus->registered = false;
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}
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/**
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* sfp_get_module_info() - Get the ethtool_modinfo for a SFP module
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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* @modinfo: a &struct ethtool_modinfo
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*
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* Fill in the type and eeprom_len parameters in @modinfo for a module on
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* the sfp bus specified by @bus.
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*
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* Returns 0 on success or a negative errno number.
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*/
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int sfp_get_module_info(struct sfp_bus *bus, struct ethtool_modinfo *modinfo)
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{
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return bus->socket_ops->module_info(bus->sfp, modinfo);
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}
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EXPORT_SYMBOL_GPL(sfp_get_module_info);
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/**
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* sfp_get_module_eeprom() - Read the SFP module EEPROM
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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* @ee: a &struct ethtool_eeprom
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* @data: buffer to contain the EEPROM data (must be at least @ee->len bytes)
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*
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* Read the EEPROM as specified by the supplied @ee. See the documentation
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* for &struct ethtool_eeprom for the region to be read.
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*
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* Returns 0 on success or a negative errno number.
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*/
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int sfp_get_module_eeprom(struct sfp_bus *bus, struct ethtool_eeprom *ee,
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u8 *data)
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{
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return bus->socket_ops->module_eeprom(bus->sfp, ee, data);
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}
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EXPORT_SYMBOL_GPL(sfp_get_module_eeprom);
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/**
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* sfp_upstream_start() - Inform the SFP that the network device is up
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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*
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* Inform the SFP socket that the network device is now up, so that the
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* module can be enabled by allowing TX_DISABLE to be deasserted. This
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* should be called from the network device driver's &struct net_device_ops
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* ndo_open() method.
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*/
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void sfp_upstream_start(struct sfp_bus *bus)
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{
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if (bus->registered)
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bus->socket_ops->start(bus->sfp);
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bus->started = true;
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}
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EXPORT_SYMBOL_GPL(sfp_upstream_start);
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/**
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* sfp_upstream_stop() - Inform the SFP that the network device is down
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* @bus: a pointer to the &struct sfp_bus structure for the sfp module
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*
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* Inform the SFP socket that the network device is now up, so that the
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* module can be disabled by asserting TX_DISABLE, disabling the laser
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* in optical modules. This should be called from the network device
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* driver's &struct net_device_ops ndo_stop() method.
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*/
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void sfp_upstream_stop(struct sfp_bus *bus)
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{
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if (bus->registered)
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bus->socket_ops->stop(bus->sfp);
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bus->started = false;
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}
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EXPORT_SYMBOL_GPL(sfp_upstream_stop);
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static void sfp_upstream_clear(struct sfp_bus *bus)
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{
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bus->upstream_ops = NULL;
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bus->upstream = NULL;
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}
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/**
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* sfp_register_upstream() - Register the neighbouring device
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* @fwnode: firmware node for the SFP bus
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* @upstream: the upstream private data
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* @ops: the upstream's &struct sfp_upstream_ops
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*
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* Register the upstream device (eg, PHY) with the SFP bus. MAC drivers
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* should use phylink, which will call this function for them. Returns
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* a pointer to the allocated &struct sfp_bus.
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*
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* On error, returns %NULL.
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*/
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struct sfp_bus *sfp_register_upstream(struct fwnode_handle *fwnode,
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void *upstream,
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const struct sfp_upstream_ops *ops)
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{
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struct sfp_bus *bus = sfp_bus_get(fwnode);
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int ret = 0;
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if (bus) {
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rtnl_lock();
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bus->upstream_ops = ops;
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bus->upstream = upstream;
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if (bus->sfp) {
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ret = sfp_register_bus(bus);
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if (ret)
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sfp_upstream_clear(bus);
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}
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rtnl_unlock();
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}
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if (ret) {
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sfp_bus_put(bus);
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bus = NULL;
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}
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return bus;
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}
|
|
EXPORT_SYMBOL_GPL(sfp_register_upstream);
|
|
|
|
/**
|
|
* sfp_unregister_upstream() - Unregister sfp bus
|
|
* @bus: a pointer to the &struct sfp_bus structure for the sfp module
|
|
*
|
|
* Unregister a previously registered upstream connection for the SFP
|
|
* module. @bus is returned from sfp_register_upstream().
|
|
*/
|
|
void sfp_unregister_upstream(struct sfp_bus *bus)
|
|
{
|
|
rtnl_lock();
|
|
if (bus->sfp)
|
|
sfp_unregister_bus(bus);
|
|
sfp_upstream_clear(bus);
|
|
rtnl_unlock();
|
|
|
|
sfp_bus_put(bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_unregister_upstream);
|
|
|
|
/* Socket driver entry points */
|
|
int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
int ret = 0;
|
|
|
|
if (ops && ops->connect_phy)
|
|
ret = ops->connect_phy(bus->upstream, phydev);
|
|
|
|
if (ret == 0)
|
|
bus->phydev = phydev;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_add_phy);
|
|
|
|
void sfp_remove_phy(struct sfp_bus *bus)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
|
|
if (ops && ops->disconnect_phy)
|
|
ops->disconnect_phy(bus->upstream);
|
|
bus->phydev = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_remove_phy);
|
|
|
|
void sfp_link_up(struct sfp_bus *bus)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
|
|
if (ops && ops->link_up)
|
|
ops->link_up(bus->upstream);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_link_up);
|
|
|
|
void sfp_link_down(struct sfp_bus *bus)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
|
|
if (ops && ops->link_down)
|
|
ops->link_down(bus->upstream);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_link_down);
|
|
|
|
int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
int ret = 0;
|
|
|
|
if (ops && ops->module_insert)
|
|
ret = ops->module_insert(bus->upstream, id);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_module_insert);
|
|
|
|
void sfp_module_remove(struct sfp_bus *bus)
|
|
{
|
|
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
|
|
|
|
if (ops && ops->module_remove)
|
|
ops->module_remove(bus->upstream);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_module_remove);
|
|
|
|
static void sfp_socket_clear(struct sfp_bus *bus)
|
|
{
|
|
bus->sfp_dev = NULL;
|
|
bus->sfp = NULL;
|
|
bus->socket_ops = NULL;
|
|
}
|
|
|
|
struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp,
|
|
const struct sfp_socket_ops *ops)
|
|
{
|
|
struct sfp_bus *bus = sfp_bus_get(dev->fwnode);
|
|
int ret = 0;
|
|
|
|
if (bus) {
|
|
rtnl_lock();
|
|
bus->sfp_dev = dev;
|
|
bus->sfp = sfp;
|
|
bus->socket_ops = ops;
|
|
|
|
if (bus->upstream_ops) {
|
|
ret = sfp_register_bus(bus);
|
|
if (ret)
|
|
sfp_socket_clear(bus);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
if (ret) {
|
|
sfp_bus_put(bus);
|
|
bus = NULL;
|
|
}
|
|
|
|
return bus;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_register_socket);
|
|
|
|
void sfp_unregister_socket(struct sfp_bus *bus)
|
|
{
|
|
rtnl_lock();
|
|
if (bus->upstream_ops)
|
|
sfp_unregister_bus(bus);
|
|
sfp_socket_clear(bus);
|
|
rtnl_unlock();
|
|
|
|
sfp_bus_put(bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sfp_unregister_socket);
|