mcdi_port.c

/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2009-2013 Solarflare Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

/*
 * Driver for PHY related operations via MCDI.
 */

#include <linux/slab.h>
#include "efx.h"
#include "phy.h"
#include "mcdi.h"
#include "mcdi_pcol.h"
#include "nic.h"
#include "selftest.h"

struct efx_mcdi_phy_data {
	u32 flags;
	u32 type;
	u32 supported_cap;
	u32 channel;
	u32 port;
	u32 stats_mask;
	u8 name[20];
	u32 media;
	u32 mmd_mask;
	u8 revision[20];
	u32 forced_cap;
};

static int
efx_mcdi_get_phy_cfg(struct efx_nic *efx, struct efx_mcdi_phy_data *cfg)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_PHY_CFG_OUT_LEN);
	size_t outlen;
	int rc;

	BUILD_BUG_ON(MC_CMD_GET_PHY_CFG_IN_LEN != 0);
	BUILD_BUG_ON(MC_CMD_GET_PHY_CFG_OUT_NAME_LEN != sizeof(cfg->name));

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_PHY_CFG, NULL, 0,
			  outbuf, sizeof(outbuf), &outlen);
	if (rc)
		goto fail;

	if (outlen < MC_CMD_GET_PHY_CFG_OUT_LEN) {
		rc = -EIO;
		goto fail;
	}

	cfg->flags = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_FLAGS);
	cfg->type = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_TYPE);
	cfg->supported_cap =
		MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_SUPPORTED_CAP);
	cfg->channel = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_CHANNEL);
	cfg->port = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_PRT);
	cfg->stats_mask = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_STATS_MASK);
	memcpy(cfg->name, MCDI_PTR(outbuf, GET_PHY_CFG_OUT_NAME),
	       sizeof(cfg->name));
	cfg->media = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_MEDIA_TYPE);
	cfg->mmd_mask = MCDI_DWORD(outbuf, GET_PHY_CFG_OUT_MMD_MASK);
	memcpy(cfg->revision, MCDI_PTR(outbuf, GET_PHY_CFG_OUT_REVISION),
	       sizeof(cfg->revision));

	return 0;

fail:
	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
	return rc;
}

static int efx_mcdi_set_link(struct efx_nic *efx, u32 capabilities,
			     u32 flags, u32 loopback_mode,
			     u32 loopback_speed)
{
	MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_LINK_IN_LEN);
	int rc;

	BUILD_BUG_ON(MC_CMD_SET_LINK_OUT_LEN != 0);

	MCDI_SET_DWORD(inbuf, SET_LINK_IN_CAP, capabilities);
	MCDI_SET_DWORD(inbuf, SET_LINK_IN_FLAGS, flags);
	MCDI_SET_DWORD(inbuf, SET_LINK_IN_LOOPBACK_MODE, loopback_mode);
	MCDI_SET_DWORD(inbuf, SET_LINK_IN_LOOPBACK_SPEED, loopback_speed);

	rc = efx_mcdi_rpc(efx, MC_CMD_SET_LINK, inbuf, sizeof(inbuf),
			  NULL, 0, NULL);
	return rc;
}

static int efx_mcdi_loopback_modes(struct efx_nic *efx, u64 *loopback_modes)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LOOPBACK_MODES_OUT_LEN);
	size_t outlen;
	int rc;

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LOOPBACK_MODES, NULL, 0,
			  outbuf, sizeof(outbuf), &outlen);
	if (rc)
		goto fail;

	if (outlen < (MC_CMD_GET_LOOPBACK_MODES_OUT_SUGGESTED_OFST +
		      MC_CMD_GET_LOOPBACK_MODES_OUT_SUGGESTED_LEN)) {
		rc = -EIO;
		goto fail;
	}

	*loopback_modes = MCDI_QWORD(outbuf, GET_LOOPBACK_MODES_OUT_SUGGESTED);

	return 0;

fail:
	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
	return rc;
}

static int efx_mcdi_mdio_read(struct net_device *net_dev,
			      int prtad, int devad, u16 addr)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_READ_IN_LEN);
	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_READ_OUT_LEN);
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_BUS, efx->mdio_bus);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_PRTAD, prtad);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_DEVAD, devad);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_ADDR, addr);

	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_READ, inbuf, sizeof(inbuf),
			  outbuf, sizeof(outbuf), &outlen);
	if (rc)
		return rc;

	if (MCDI_DWORD(outbuf, MDIO_READ_OUT_STATUS) !=
	    MC_CMD_MDIO_STATUS_GOOD)
		return -EIO;

	return (u16)MCDI_DWORD(outbuf, MDIO_READ_OUT_VALUE);
}

static int efx_mcdi_mdio_write(struct net_device *net_dev,
			       int prtad, int devad, u16 addr, u16 value)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_WRITE_IN_LEN);
	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_WRITE_OUT_LEN);
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_BUS, efx->mdio_bus);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_PRTAD, prtad);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_DEVAD, devad);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_ADDR, addr);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_VALUE, value);

	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_WRITE, inbuf, sizeof(inbuf),
			  outbuf, sizeof(outbuf), &outlen);
	if (rc)
		return rc;

	if (MCDI_DWORD(outbuf, MDIO_WRITE_OUT_STATUS) !=
	    MC_CMD_MDIO_STATUS_GOOD)
		return -EIO;

	return 0;
}

static u32 mcdi_to_ethtool_cap(u32 media, u32 cap)
{
	u32 result = 0;

	switch (media) {
	case MC_CMD_MEDIA_KX4:
		result |= SUPPORTED_Backplane;
		if (cap & (1 << MC_CMD_PHY_CAP_1000FDX_LBN))
			result |= SUPPORTED_1000baseKX_Full;
		if (cap & (1 << MC_CMD_PHY_CAP_10000FDX_LBN))
			result |= SUPPORTED_10000baseKX4_Full;
		break;

	case MC_CMD_MEDIA_XFP:
	case MC_CMD_MEDIA_SFP_PLUS:
		result |= SUPPORTED_FIBRE;
		break;

	case MC_CMD_MEDIA_BASE_T:
		result |= SUPPORTED_TP;
		if (cap & (1 << MC_CMD_PHY_CAP_10HDX_LBN))
			result |= SUPPORTED_10baseT_Half;
		if (cap & (1 << MC_CMD_PHY_CAP_10FDX_LBN))
			result |= SUPPORTED_10baseT_Full;
		if (cap & (1 << MC_CMD_PHY_CAP_100HDX_LBN))
			result |= SUPPORTED_100baseT_Half;
		if (cap & (1 << MC_CMD_PHY_CAP_100FDX_LBN))
			result |= SUPPORTED_100baseT_Full;
		if (cap & (1 << MC_CMD_PHY_CAP_1000HDX_LBN))
			result |= SUPPORTED_1000baseT_Half;
		if (cap & (1 << MC_CMD_PHY_CAP_1000FDX_LBN))
			result |= SUPPORTED_1000baseT_Full;
		if (cap & (1 << MC_CMD_PHY_CAP_10000FDX_LBN))
			result |= SUPPORTED_10000baseT_Full;
		break;
	}

	if (cap & (1 << MC_CMD_PHY_CAP_PAUSE_LBN))
		result |= SUPPORTED_Pause;
	if (cap & (1 << MC_CMD_PHY_CAP_ASYM_LBN))
		result |= SUPPORTED_Asym_Pause;
	if (cap & (1 << MC_CMD_PHY_CAP_AN_LBN))
		result |= SUPPORTED_Autoneg;

	return result;
}

static u32 ethtool_to_mcdi_cap(u32 cap)
{
	u32 result = 0;

	if (cap & SUPPORTED_10baseT_Half)
		result |= (1 << MC_CMD_PHY_CAP_10HDX_LBN);
	if (cap & SUPPORTED_10baseT_Full)
		result |= (1 << MC_CMD_PHY_CAP_10FDX_LBN);
	if (cap & SUPPORTED_100baseT_Half)
		result |= (1 << MC_CMD_PHY_CAP_100HDX_LBN);
	if (cap & SUPPORTED_100baseT_Full)
		result |= (1 << MC_CMD_PHY_CAP_100FDX_LBN);
	if (cap & SUPPORTED_1000baseT_Half)
		result |= (1 << MC_CMD_PHY_CAP_1000HDX_LBN);
	if (cap & (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseKX_Full))
		result |= (1 << MC_CMD_PHY_CAP_1000FDX_LBN);
	if (cap & (SUPPORTED_10000baseT_Full | SUPPORTED_10000baseKX4_Full))
		result |= (1 << MC_CMD_PHY_CAP_10000FDX_LBN);
	if (cap & SUPPORTED_Pause)
		result |= (1 << MC_CMD_PHY_CAP_PAUSE_LBN);
	if (cap & SUPPORTED_Asym_Pause)
		result |= (1 << MC_CMD_PHY_CAP_ASYM_LBN);
	if (cap & SUPPORTED_Autoneg)
		result |= (1 << MC_CMD_PHY_CAP_AN_LBN);

	return result;
}

static u32 efx_get_mcdi_phy_flags(struct efx_nic *efx)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	enum efx_phy_mode mode, supported;
	u32 flags;

	/* TODO: Advertise the capabilities supported by this PHY */
	supported = 0;
	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_TXDIS_LBN))
		supported |= PHY_MODE_TX_DISABLED;
	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_LOWPOWER_LBN))
		supported |= PHY_MODE_LOW_POWER;
	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_POWEROFF_LBN))
		supported |= PHY_MODE_OFF;

	mode = efx->phy_mode & supported;

	flags = 0;
	if (mode & PHY_MODE_TX_DISABLED)
		flags |= (1 << MC_CMD_SET_LINK_IN_TXDIS_LBN);
	if (mode & PHY_MODE_LOW_POWER)
		flags |= (1 << MC_CMD_SET_LINK_IN_LOWPOWER_LBN);
	if (mode & PHY_MODE_OFF)
		flags |= (1 << MC_CMD_SET_LINK_IN_POWEROFF_LBN);

	return flags;
}

static u32 mcdi_to_ethtool_media(u32 media)
{
	switch (media) {
	case MC_CMD_MEDIA_XAUI:
	case MC_CMD_MEDIA_CX4:
	case MC_CMD_MEDIA_KX4:
		return PORT_OTHER;

	case MC_CMD_MEDIA_XFP:
	case MC_CMD_MEDIA_SFP_PLUS:
		return PORT_FIBRE;

	case MC_CMD_MEDIA_BASE_T:
		return PORT_TP;

	default:
		return PORT_OTHER;
	}
}

static void efx_mcdi_phy_decode_link(struct efx_nic *efx,
			      struct efx_link_state *link_state,
			      u32 speed, u32 flags, u32 fcntl)
{
	switch (fcntl) {
	case MC_CMD_FCNTL_AUTO:
		WARN_ON(1);	/* This is not a link mode */
		link_state->fc = EFX_FC_AUTO | EFX_FC_TX | EFX_FC_RX;
		break;
	case MC_CMD_FCNTL_BIDIR:
		link_state->fc = EFX_FC_TX | EFX_FC_RX;
		break;
	case MC_CMD_FCNTL_RESPOND:
		link_state->fc = EFX_FC_RX;
		break;
	default:
		WARN_ON(1);
	case MC_CMD_FCNTL_OFF:
		link_state->fc = 0;
		break;
	}

	link_state->up = !!(flags & (1 << MC_CMD_GET_LINK_OUT_LINK_UP_LBN));
	link_state->fd = !!(flags & (1 << MC_CMD_GET_LINK_OUT_FULL_DUPLEX_LBN));
	link_state->speed = speed;
}

static int efx_mcdi_phy_probe(struct efx_nic *efx)
{
	struct efx_mcdi_phy_data *phy_data;
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
	u32 caps;
	int rc;

	/* Initialise and populate phy_data */
	phy_data = kzalloc(sizeof(*phy_data), GFP_KERNEL);
	if (phy_data == NULL)
		return -ENOMEM;

	rc = efx_mcdi_get_phy_cfg(efx, phy_data);
	if (rc != 0)
		goto fail;

	/* Read initial link advertisement */
	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);
	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
			  outbuf, sizeof(outbuf), NULL);
	if (rc)
		goto fail;

	/* Fill out nic state */
	efx->phy_data = phy_data;
	efx->phy_type = phy_data->type;

	efx->mdio_bus = phy_data->channel;
	efx->mdio.prtad = phy_data->port;
	efx->mdio.mmds = phy_data->mmd_mask & ~(1 << MC_CMD_MMD_CLAUSE22);
	efx->mdio.mode_support = 0;
	if (phy_data->mmd_mask & (1 << MC_CMD_MMD_CLAUSE22))
		efx->mdio.mode_support |= MDIO_SUPPORTS_C22;
	if (phy_data->mmd_mask & ~(1 << MC_CMD_MMD_CLAUSE22))
		efx->mdio.mode_support |= MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;

	caps = MCDI_DWORD(outbuf, GET_LINK_OUT_CAP);
	if (caps & (1 << MC_CMD_PHY_CAP_AN_LBN))
		efx->link_advertising =
			mcdi_to_ethtool_cap(phy_data->media, caps);
	else
		phy_data->forced_cap = caps;

	/* Assert that we can map efx -> mcdi loopback modes */
	BUILD_BUG_ON(LOOPBACK_NONE != MC_CMD_LOOPBACK_NONE);
	BUILD_BUG_ON(LOOPBACK_DATA != MC_CMD_LOOPBACK_DATA);
	BUILD_BUG_ON(LOOPBACK_GMAC != MC_CMD_LOOPBACK_GMAC);
	BUILD_BUG_ON(LOOPBACK_XGMII != MC_CMD_LOOPBACK_XGMII);
	BUILD_BUG_ON(LOOPBACK_XGXS != MC_CMD_LOOPBACK_XGXS);
	BUILD_BUG_ON(LOOPBACK_XAUI != MC_CMD_LOOPBACK_XAUI);
	BUILD_BUG_ON(LOOPBACK_GMII != MC_CMD_LOOPBACK_GMII);
	BUILD_BUG_ON(LOOPBACK_SGMII != MC_CMD_LOOPBACK_SGMII);
	BUILD_BUG_ON(LOOPBACK_XGBR != MC_CMD_LOOPBACK_XGBR);
	BUILD_BUG_ON(LOOPBACK_XFI != MC_CMD_LOOPBACK_XFI);
	BUILD_BUG_ON(LOOPBACK_XAUI_FAR != MC_CMD_LOOPBACK_XAUI_FAR);
	BUILD_BUG_ON(LOOPBACK_GMII_FAR != MC_CMD_LOOPBACK_GMII_FAR);
	BUILD_BUG_ON(LOOPBACK_SGMII_FAR != MC_CMD_LOOPBACK_SGMII_FAR);
	BUILD_BUG_ON(LOOPBACK_XFI_FAR != MC_CMD_LOOPBACK_XFI_FAR);
	BUILD_BUG_ON(LOOPBACK_GPHY != MC_CMD_LOOPBACK_GPHY);
	BUILD_BUG_ON(LOOPBACK_PHYXS != MC_CMD_LOOPBACK_PHYXS);
	BUILD_BUG_ON(LOOPBACK_PCS != MC_CMD_LOOPBACK_PCS);
	BUILD_BUG_ON(LOOPBACK_PMAPMD != MC_CMD_LOOPBACK_PMAPMD);
	BUILD_BUG_ON(LOOPBACK_XPORT != MC_CMD_LOOPBACK_XPORT);
	BUILD_BUG_ON(LOOPBACK_XGMII_WS != MC_CMD_LOOPBACK_XGMII_WS);
	BUILD_BUG_ON(LOOPBACK_XAUI_WS != MC_CMD_LOOPBACK_XAUI_WS);
	BUILD_BUG_ON(LOOPBACK_XAUI_WS_FAR != MC_CMD_LOOPBACK_XAUI_WS_FAR);
	BUILD_BUG_ON(LOOPBACK_XAUI_WS_NEAR != MC_CMD_LOOPBACK_XAUI_WS_NEAR);
	BUILD_BUG_ON(LOOPBACK_GMII_WS != MC_CMD_LOOPBACK_GMII_WS);
	BUILD_BUG_ON(LOOPBACK_XFI_WS != MC_CMD_LOOPBACK_XFI_WS);
	BUILD_BUG_ON(LOOPBACK_XFI_WS_FAR != MC_CMD_LOOPBACK_XFI_WS_FAR);
	BUILD_BUG_ON(LOOPBACK_PHYXS_WS != MC_CMD_LOOPBACK_PHYXS_WS);

	rc = efx_mcdi_loopback_modes(efx, &efx->loopback_modes);
	if (rc != 0)
		goto fail;
	/* The MC indicates that LOOPBACK_NONE is a valid loopback mode,
	 * but by convention we don't */
	efx->loopback_modes &= ~(1 << LOOPBACK_NONE);

	/* Set the initial link mode */
	efx_mcdi_phy_decode_link(
		efx, &efx->link_state,
		MCDI_DWORD(outbuf, GET_LINK_OUT_LINK_SPEED),
		MCDI_DWORD(outbuf, GET_LINK_OUT_FLAGS),
		MCDI_DWORD(outbuf, GET_LINK_OUT_FCNTL));

	/* Default to Autonegotiated flow control if the PHY supports it */
	efx->wanted_fc = EFX_FC_RX | EFX_FC_TX;
	if (phy_data->supported_cap & (1 << MC_CMD_PHY_CAP_AN_LBN))
		efx->wanted_fc |= EFX_FC_AUTO;
	efx_link_set_wanted_fc(efx, efx->wanted_fc);

	return 0;

fail:
	kfree(phy_data);
	return rc;
}

int efx_mcdi_port_reconfigure(struct efx_nic *efx)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	u32 caps = (efx->link_advertising ?
		    ethtool_to_mcdi_cap(efx->link_advertising) :
		    phy_cfg->forced_cap);

	return efx_mcdi_set_link(efx, caps, efx_get_mcdi_phy_flags(efx),
				 efx->loopback_mode, 0);
}

/* Verify that the forced flow control settings (!EFX_FC_AUTO) are
 * supported by the link partner. Warn the user if this isn't the case
 */
static void efx_mcdi_phy_check_fcntl(struct efx_nic *efx, u32 lpa)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	u32 rmtadv;

	/* The link partner capabilities are only relevant if the
	 * link supports flow control autonegotiation */
	if (~phy_cfg->supported_cap & (1 << MC_CMD_PHY_CAP_AN_LBN))
		return;

	/* If flow control autoneg is supported and enabled, then fine */
	if (efx->wanted_fc & EFX_FC_AUTO)
		return;

	rmtadv = 0;
	if (lpa & (1 << MC_CMD_PHY_CAP_PAUSE_LBN))
		rmtadv |= ADVERTISED_Pause;
	if (lpa & (1 << MC_CMD_PHY_CAP_ASYM_LBN))
		rmtadv |=  ADVERTISED_Asym_Pause;

	if ((efx->wanted_fc & EFX_FC_TX) && rmtadv == ADVERTISED_Asym_Pause)
		netif_err(efx, link, efx->net_dev,
			  "warning: link partner doesn't support pause frames");
}

static bool efx_mcdi_phy_poll(struct efx_nic *efx)
{
	struct efx_link_state old_state = efx->link_state;
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
	int rc;

	WARN_ON(!mutex_is_locked(&efx->mac_lock));

	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
			  outbuf, sizeof(outbuf), NULL);
	if (rc)
		efx->link_state.up = false;
	else
		efx_mcdi_phy_decode_link(
			efx, &efx->link_state,
			MCDI_DWORD(outbuf, GET_LINK_OUT_LINK_SPEED),
			MCDI_DWORD(outbuf, GET_LINK_OUT_FLAGS),
			MCDI_DWORD(outbuf, GET_LINK_OUT_FCNTL));

	return !efx_link_state_equal(&efx->link_state, &old_state);
}

static void efx_mcdi_phy_remove(struct efx_nic *efx)
{
	struct efx_mcdi_phy_data *phy_data = efx->phy_data;

	efx->phy_data = NULL;
	kfree(phy_data);
}

static void efx_mcdi_phy_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
	int rc;

	ecmd->supported =
		mcdi_to_ethtool_cap(phy_cfg->media, phy_cfg->supported_cap);
	ecmd->advertising = efx->link_advertising;
	ethtool_cmd_speed_set(ecmd, efx->link_state.speed);
	ecmd->duplex = efx->link_state.fd;
	ecmd->port = mcdi_to_ethtool_media(phy_cfg->media);
	ecmd->phy_address = phy_cfg->port;
	ecmd->transceiver = XCVR_INTERNAL;
	ecmd->autoneg = !!(efx->link_advertising & ADVERTISED_Autoneg);
	ecmd->mdio_support = (efx->mdio.mode_support &
			      (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22));

	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);
	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
			  outbuf, sizeof(outbuf), NULL);
	if (rc)
		return;
	ecmd->lp_advertising =
		mcdi_to_ethtool_cap(phy_cfg->media,
				    MCDI_DWORD(outbuf, GET_LINK_OUT_LP_CAP));
}

static int efx_mcdi_phy_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	u32 caps;
	int rc;

	if (ecmd->autoneg) {
		caps = (ethtool_to_mcdi_cap(ecmd->advertising) |
			 1 << MC_CMD_PHY_CAP_AN_LBN);
	} else if (ecmd->duplex) {
		switch (ethtool_cmd_speed(ecmd)) {
		case 10:    caps = 1 << MC_CMD_PHY_CAP_10FDX_LBN;    break;
		case 100:   caps = 1 << MC_CMD_PHY_CAP_100FDX_LBN;   break;
		case 1000:  caps = 1 << MC_CMD_PHY_CAP_1000FDX_LBN;  break;
		case 10000: caps = 1 << MC_CMD_PHY_CAP_10000FDX_LBN; break;
		case 40000: caps = 1 << MC_CMD_PHY_CAP_40000FDX_LBN; break;
		default:    return -EINVAL;
		}
	} else {
		switch (ethtool_cmd_speed(ecmd)) {
		case 10:    caps = 1 << MC_CMD_PHY_CAP_10HDX_LBN;    break;
		case 100:   caps = 1 << MC_CMD_PHY_CAP_100HDX_LBN;   break;
		case 1000:  caps = 1 << MC_CMD_PHY_CAP_1000HDX_LBN;  break;
		default:    return -EINVAL;
		}
	}

	rc = efx_mcdi_set_link(efx, caps, efx_get_mcdi_phy_flags(efx),
			       efx->loopback_mode, 0);
	if (rc)
		return rc;

	if (ecmd->autoneg) {
		efx_link_set_advertising(
			efx, ecmd->advertising | ADVERTISED_Autoneg);
		phy_cfg->forced_cap = 0;
	} else {
		efx_link_set_advertising(efx, 0);
		phy_cfg->forced_cap = caps;
	}
	return 0;
}

static int efx_mcdi_phy_test_alive(struct efx_nic *efx)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_PHY_STATE_OUT_LEN);
	size_t outlen;
	int rc;

	BUILD_BUG_ON(MC_CMD_GET_PHY_STATE_IN_LEN != 0);

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_PHY_STATE, NULL, 0,
			  outbuf, sizeof(outbuf), &outlen);
	if (rc)
		return rc;

	if (outlen < MC_CMD_GET_PHY_STATE_OUT_LEN)
		return -EIO;
	if (MCDI_DWORD(outbuf, GET_PHY_STATE_OUT_STATE) != MC_CMD_PHY_STATE_OK)
		return -EINVAL;

	return 0;
}

static const char *const mcdi_sft9001_cable_diag_names[] = {
	"cable.pairA.length",
	"cable.pairB.length",
	"cable.pairC.length",
	"cable.pairD.length",
	"cable.pairA.status",
	"cable.pairB.status",
	"cable.pairC.status",
	"cable.pairD.status",
};

static int efx_mcdi_bist(struct efx_nic *efx, unsigned int bist_mode,
			 int *results)
{
	unsigned int retry, i, count = 0;
	size_t outlen;
	u32 status;
	MCDI_DECLARE_BUF(inbuf, MC_CMD_START_BIST_IN_LEN);
	MCDI_DECLARE_BUF(outbuf, MC_CMD_POLL_BIST_OUT_SFT9001_LEN);
	u8 *ptr;
	int rc;

	BUILD_BUG_ON(MC_CMD_START_BIST_OUT_LEN != 0);
	MCDI_SET_DWORD(inbuf, START_BIST_IN_TYPE, bist_mode);
	rc = efx_mcdi_rpc(efx, MC_CMD_START_BIST,
			  inbuf, MC_CMD_START_BIST_IN_LEN, NULL, 0, NULL);
	if (rc)
		goto out;

	/* Wait up to 10s for BIST to finish */
	for (retry = 0; retry < 100; ++retry) {
		BUILD_BUG_ON(MC_CMD_POLL_BIST_IN_LEN != 0);
		rc = efx_mcdi_rpc(efx, MC_CMD_POLL_BIST, NULL, 0,
				  outbuf, sizeof(outbuf), &outlen);
		if (rc)
			goto out;

		status = MCDI_DWORD(outbuf, POLL_BIST_OUT_RESULT);
		if (status != MC_CMD_POLL_BIST_RUNNING)
			goto finished;

		msleep(100);
	}

	rc = -ETIMEDOUT;
	goto out;

finished:
	results[count++] = (status == MC_CMD_POLL_BIST_PASSED) ? 1 : -1;

	/* SFT9001 specific cable diagnostics output */
	if (efx->phy_type == PHY_TYPE_SFT9001B &&
	    (bist_mode == MC_CMD_PHY_BIST_CABLE_SHORT ||
	     bist_mode == MC_CMD_PHY_BIST_CABLE_LONG)) {
		ptr = MCDI_PTR(outbuf, POLL_BIST_OUT_SFT9001_CABLE_LENGTH_A);
		if (status == MC_CMD_POLL_BIST_PASSED &&
		    outlen >= MC_CMD_POLL_BIST_OUT_SFT9001_LEN) {
			for (i = 0; i < 8; i++) {
				results[count + i] =
					EFX_DWORD_FIELD(((efx_dword_t *)ptr)[i],
							EFX_DWORD_0);
			}
		}
		count += 8;
	}
	rc = count;

out:
	return rc;
}

static int efx_mcdi_phy_run_tests(struct efx_nic *efx, int *results,
				  unsigned flags)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
	u32 mode;
	int rc;

	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_LBN)) {
		rc = efx_mcdi_bist(efx, MC_CMD_PHY_BIST, results);
		if (rc < 0)
			return rc;

		results += rc;
	}

	/* If we support both LONG and SHORT, then run each in response to
	 * break or not. Otherwise, run the one we support */
	mode = 0;
	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_CABLE_SHORT_LBN)) {
		if ((flags & ETH_TEST_FL_OFFLINE) &&
		    (phy_cfg->flags &
		     (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_CABLE_LONG_LBN)))
			mode = MC_CMD_PHY_BIST_CABLE_LONG;
		else
			mode = MC_CMD_PHY_BIST_CABLE_SHORT;
	} else if (phy_cfg->flags &
		   (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_CABLE_LONG_LBN))
		mode = MC_CMD_PHY_BIST_CABLE_LONG;

	if (mode != 0) {
		rc = efx_mcdi_bist(efx, mode, results);
		if (rc < 0)
			return rc;
		results += rc;
	}

	return 0;
}

static const char *efx_mcdi_phy_test_name(struct efx_nic *efx,
					  unsigned int index)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;

	if (phy_cfg->flags & (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_LBN)) {
		if (index == 0)
			return "bist";
		--index;
	}

	if (phy_cfg->flags & ((1 << MC_CMD_GET_PHY_CFG_OUT_BIST_CABLE_SHORT_LBN) |
			      (1 << MC_CMD_GET_PHY_CFG_OUT_BIST_CABLE_LONG_LBN))) {
		if (index == 0)
			return "cable";
		--index;

		if (efx->phy_type == PHY_TYPE_SFT9001B) {
			if (index < ARRAY_SIZE(mcdi_sft9001_cable_diag_names))
				return mcdi_sft9001_cable_diag_names[index];
			index -= ARRAY_SIZE(mcdi_sft9001_cable_diag_names);
		}
	}

	return NULL;
}

#define SFP_PAGE_SIZE	128
#define SFP_NUM_PAGES	2
static int efx_mcdi_phy_get_module_eeprom(struct efx_nic *efx,
					  struct ethtool_eeprom *ee, u8 *data)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_PHY_MEDIA_INFO_OUT_LENMAX);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_PHY_MEDIA_INFO_IN_LEN);
	size_t outlen;
	int rc;
	unsigned int payload_len;
	unsigned int space_remaining = ee->len;
	unsigned int page;
	unsigned int page_off;
	unsigned int to_copy;
	u8 *user_data = data;

	BUILD_BUG_ON(SFP_PAGE_SIZE * SFP_NUM_PAGES != ETH_MODULE_SFF_8079_LEN);

	page_off = ee->offset % SFP_PAGE_SIZE;
	page = ee->offset / SFP_PAGE_SIZE;

	while (space_remaining && (page < SFP_NUM_PAGES)) {
		MCDI_SET_DWORD(inbuf, GET_PHY_MEDIA_INFO_IN_PAGE, page);

		rc = efx_mcdi_rpc(efx, MC_CMD_GET_PHY_MEDIA_INFO,
				  inbuf, sizeof(inbuf),
				  outbuf, sizeof(outbuf),
				  &outlen);
		if (rc)
			return rc;

		if (outlen < (MC_CMD_GET_PHY_MEDIA_INFO_OUT_DATA_OFST +
			      SFP_PAGE_SIZE))
			return -EIO;

		payload_len = MCDI_DWORD(outbuf,
					 GET_PHY_MEDIA_INFO_OUT_DATALEN);
		if (payload_len != SFP_PAGE_SIZE)
			return -EIO;

		/* Copy as much as we can into data */
		payload_len -= page_off;
		to_copy = (space_remaining < payload_len) ?
			space_remaining : payload_len;

		memcpy(user_data,
		       MCDI_PTR(outbuf, GET_PHY_MEDIA_INFO_OUT_DATA) + page_off,
		       to_copy);

		space_remaining -= to_copy;
		user_data += to_copy;
		page_off = 0;
		page++;
	}

	return 0;
}

static int efx_mcdi_phy_get_module_info(struct efx_nic *efx,
					struct ethtool_modinfo *modinfo)
{
	struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;

	switch (phy_cfg->media) {
	case MC_CMD_MEDIA_SFP_PLUS:
		modinfo->type = ETH_MODULE_SFF_8079;
		modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static const struct efx_phy_operations efx_mcdi_phy_ops = {
	.probe		= efx_mcdi_phy_probe,
	.init		= efx_port_dummy_op_int,
	.reconfigure	= efx_mcdi_port_reconfigure,
	.poll		= efx_mcdi_phy_poll,
	.fini		= efx_port_dummy_op_void,
	.remove		= efx_mcdi_phy_remove,
	.get_settings	= efx_mcdi_phy_get_settings,
	.set_settings	= efx_mcdi_phy_set_settings,
	.test_alive	= efx_mcdi_phy_test_alive,
	.run_tests	= efx_mcdi_phy_run_tests,
	.test_name	= efx_mcdi_phy_test_name,
	.get_module_eeprom = efx_mcdi_phy_get_module_eeprom,
	.get_module_info = efx_mcdi_phy_get_module_info,
};

u32 efx_mcdi_phy_get_caps(struct efx_nic *efx)
{
	struct efx_mcdi_phy_data *phy_data = efx->phy_data;

	return phy_data->supported_cap;
}

static unsigned int efx_mcdi_event_link_speed[] = {
	[MCDI_EVENT_LINKCHANGE_SPEED_100M] = 100,
	[MCDI_EVENT_LINKCHANGE_SPEED_1G] = 1000,
	[MCDI_EVENT_LINKCHANGE_SPEED_10G] = 10000,
	[MCDI_EVENT_LINKCHANGE_SPEED_40G] = 40000,
};

void efx_mcdi_process_link_change(struct efx_nic *efx, efx_qword_t *ev)
{
	u32 flags, fcntl, speed, lpa;

	speed = EFX_QWORD_FIELD(*ev, MCDI_EVENT_LINKCHANGE_SPEED);
	EFX_BUG_ON_PARANOID(speed >= ARRAY_SIZE(efx_mcdi_event_link_speed));
	speed = efx_mcdi_event_link_speed[speed];

	flags = EFX_QWORD_FIELD(*ev, MCDI_EVENT_LINKCHANGE_LINK_FLAGS);
	fcntl = EFX_QWORD_FIELD(*ev, MCDI_EVENT_LINKCHANGE_FCNTL);
	lpa = EFX_QWORD_FIELD(*ev, MCDI_EVENT_LINKCHANGE_LP_CAP);

	/* efx->link_state is only modified by efx_mcdi_phy_get_link(),
	 * which is only run after flushing the event queues. Therefore, it
	 * is safe to modify the link state outside of the mac_lock here.
	 */
	efx_mcdi_phy_decode_link(efx, &efx->link_state, speed, flags, fcntl);

	efx_mcdi_phy_check_fcntl(efx, lpa);

	efx_link_status_changed(efx);
}

int efx_mcdi_set_mac(struct efx_nic *efx)
{
	u32 fcntl;
	MCDI_DECLARE_BUF(cmdbytes, MC_CMD_SET_MAC_IN_LEN);

	BUILD_BUG_ON(MC_CMD_SET_MAC_OUT_LEN != 0);

	memcpy(MCDI_PTR(cmdbytes, SET_MAC_IN_ADDR),
	       efx->net_dev->dev_addr, ETH_ALEN);

	MCDI_SET_DWORD(cmdbytes, SET_MAC_IN_MTU,
			EFX_MAX_FRAME_LEN(efx->net_dev->mtu));
	MCDI_SET_DWORD(cmdbytes, SET_MAC_IN_DRAIN, 0);

	/* Set simple MAC filter for Siena */
	MCDI_POPULATE_DWORD_1(cmdbytes, SET_MAC_IN_REJECT,
			      SET_MAC_IN_REJECT_UNCST, efx->unicast_filter);

	switch (efx->wanted_fc) {
	case EFX_FC_RX | EFX_FC_TX:
		fcntl = MC_CMD_FCNTL_BIDIR;
		break;
	case EFX_FC_RX:
		fcntl = MC_CMD_FCNTL_RESPOND;
		break;
	default:
		fcntl = MC_CMD_FCNTL_OFF;
		break;
	}
	if (efx->wanted_fc & EFX_FC_AUTO)
		fcntl = MC_CMD_FCNTL_AUTO;
	if (efx->fc_disable)
		fcntl = MC_CMD_FCNTL_OFF;

	MCDI_SET_DWORD(cmdbytes, SET_MAC_IN_FCNTL, fcntl);

	return efx_mcdi_rpc(efx, MC_CMD_SET_MAC, cmdbytes, sizeof(cmdbytes),
			    NULL, 0, NULL);
}

bool efx_mcdi_mac_check_fault(struct efx_nic *efx)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
	size_t outlength;
	int rc;

	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
			  outbuf, sizeof(outbuf), &outlength);
	if (rc)
		return true;

	return MCDI_DWORD(outbuf, GET_LINK_OUT_MAC_FAULT) != 0;
}

enum efx_stats_action {
	EFX_STATS_ENABLE,
	EFX_STATS_DISABLE,
	EFX_STATS_PULL,
};

static int efx_mcdi_mac_stats(struct efx_nic *efx,
			      enum efx_stats_action action, int clear)
{
	MCDI_DECLARE_BUF(inbuf, MC_CMD_MAC_STATS_IN_LEN);
	int rc;
	int change = action == EFX_STATS_PULL ? 0 : 1;
	int enable = action == EFX_STATS_ENABLE ? 1 : 0;
	int period = action == EFX_STATS_ENABLE ? 1000 : 0;
	dma_addr_t dma_addr = efx->stats_buffer.dma_addr;
	u32 dma_len = action != EFX_STATS_DISABLE ?
		MC_CMD_MAC_NSTATS * sizeof(u64) : 0;

	BUILD_BUG_ON(MC_CMD_MAC_STATS_OUT_DMA_LEN != 0);

	MCDI_SET_QWORD(inbuf, MAC_STATS_IN_DMA_ADDR, dma_addr);
	MCDI_POPULATE_DWORD_7(inbuf, MAC_STATS_IN_CMD,
			      MAC_STATS_IN_DMA, !!enable,
			      MAC_STATS_IN_CLEAR, clear,
			      MAC_STATS_IN_PERIODIC_CHANGE, change,
			      MAC_STATS_IN_PERIODIC_ENABLE, enable,
			      MAC_STATS_IN_PERIODIC_CLEAR, 0,
			      MAC_STATS_IN_PERIODIC_NOEVENT, 1,
			      MAC_STATS_IN_PERIOD_MS, period);
	MCDI_SET_DWORD(inbuf, MAC_STATS_IN_DMA_LEN, dma_len);

	rc = efx_mcdi_rpc(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
			  NULL, 0, NULL);
	return rc;
}

void efx_mcdi_mac_start_stats(struct efx_nic *efx)
{
	__le64 *dma_stats = efx->stats_buffer.addr;

	dma_stats[MC_CMD_MAC_GENERATION_END] = EFX_MC_STATS_GENERATION_INVALID;

	efx_mcdi_mac_stats(efx, EFX_STATS_ENABLE, 0);
}

void efx_mcdi_mac_stop_stats(struct efx_nic *efx)
{
	efx_mcdi_mac_stats(efx, EFX_STATS_DISABLE, 0);
}

#define EFX_MAC_STATS_WAIT_US 100
#define EFX_MAC_STATS_WAIT_ATTEMPTS 10

void efx_mcdi_mac_pull_stats(struct efx_nic *efx)
{
	__le64 *dma_stats = efx->stats_buffer.addr;
	int attempts = EFX_MAC_STATS_WAIT_ATTEMPTS;

	dma_stats[MC_CMD_MAC_GENERATION_END] = EFX_MC_STATS_GENERATION_INVALID;
	efx_mcdi_mac_stats(efx, EFX_STATS_PULL, 0);

	while (dma_stats[MC_CMD_MAC_GENERATION_END] ==
				EFX_MC_STATS_GENERATION_INVALID &&
			attempts-- != 0)
		udelay(EFX_MAC_STATS_WAIT_US);
}

int efx_mcdi_port_probe(struct efx_nic *efx)
{
	int rc;

	/* Hook in PHY operations table */
	efx->phy_op = &efx_mcdi_phy_ops;

	/* Set up MDIO structure for PHY */
	efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
	efx->mdio.mdio_read = efx_mcdi_mdio_read;
	efx->mdio.mdio_write = efx_mcdi_mdio_write;

	/* Fill out MDIO structure, loopback modes, and initial link state */
	rc = efx->phy_op->probe(efx);
	if (rc != 0)
		return rc;

	/* Allocate buffer for stats */
	rc = efx_nic_alloc_buffer(efx, &efx->stats_buffer,
				  MC_CMD_MAC_NSTATS * sizeof(u64), GFP_KERNEL);
	if (rc)
		return rc;
	netif_dbg(efx, probe, efx->net_dev,
		  "stats buffer at %llx (virt %p phys %llx)\n",
		  (u64)efx->stats_buffer.dma_addr,
		  efx->stats_buffer.addr,
		  (u64)virt_to_phys(efx->stats_buffer.addr));

	efx_mcdi_mac_stats(efx, EFX_STATS_DISABLE, 1);

	return 0;
}

void efx_mcdi_port_remove(struct efx_nic *efx)
{
	efx->phy_op->remove(efx);
	efx_nic_free_buffer(efx, &efx->stats_buffer);
}

/* Get physical port number (EF10 only; on Siena it is same as PF number) */
int efx_mcdi_port_get_number(struct efx_nic *efx)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_PORT_ASSIGNMENT_OUT_LEN);
	int rc;

	rc = efx_mcdi_rpc(efx, MC_CMD_GET_PORT_ASSIGNMENT, NULL, 0,
			  outbuf, sizeof(outbuf), NULL);
	if (rc)
		return rc;

	return MCDI_DWORD(outbuf, GET_PORT_ASSIGNMENT_OUT_PORT);
}