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linux-next/drivers/net/ethernet/sfc/falcon_xmac.c
Ben Hutchings b7f514af7d sfc: Fix interface statistics running backward 
Some interface statistics are computed in such a way that they can
sometimes decrease (and even underflow).  Since the computed value
will never be greater than the true value, we fix this by only storing
the computed value when it increases.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
2012-07-17 16:12:34 +01:00

363 lines
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/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
* Copyright 2006-2010 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.
*/
#include <linux/delay.h>
#include "net_driver.h"
#include "efx.h"
#include "nic.h"
#include "regs.h"
#include "io.h"
#include "mdio_10g.h"
#include "workarounds.h"
/**************************************************************************
*
* MAC operations
*
*************************************************************************/
/* Configure the XAUI driver that is an output from Falcon */
void falcon_setup_xaui(struct efx_nic *efx)
{
efx_oword_t sdctl, txdrv;
/* Move the XAUI into low power, unless there is no PHY, in
* which case the XAUI will have to drive a cable. */
if (efx->phy_type == PHY_TYPE_NONE)
return;
efx_reado(efx, &sdctl, FR_AB_XX_SD_CTL);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
efx_writeo(efx, &sdctl, FR_AB_XX_SD_CTL);
EFX_POPULATE_OWORD_8(txdrv,
FRF_AB_XX_DEQD, FFE_AB_XX_TXDRV_DEQ_DEF,
FRF_AB_XX_DEQC, FFE_AB_XX_TXDRV_DEQ_DEF,
FRF_AB_XX_DEQB, FFE_AB_XX_TXDRV_DEQ_DEF,
FRF_AB_XX_DEQA, FFE_AB_XX_TXDRV_DEQ_DEF,
FRF_AB_XX_DTXD, FFE_AB_XX_TXDRV_DTX_DEF,
FRF_AB_XX_DTXC, FFE_AB_XX_TXDRV_DTX_DEF,
FRF_AB_XX_DTXB, FFE_AB_XX_TXDRV_DTX_DEF,
FRF_AB_XX_DTXA, FFE_AB_XX_TXDRV_DTX_DEF);
efx_writeo(efx, &txdrv, FR_AB_XX_TXDRV_CTL);
}
int falcon_reset_xaui(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
efx_oword_t reg;
int count;
/* Don't fetch MAC statistics over an XMAC reset */
WARN_ON(nic_data->stats_disable_count == 0);
/* Start reset sequence */
EFX_POPULATE_OWORD_1(reg, FRF_AB_XX_RST_XX_EN, 1);
efx_writeo(efx, &reg, FR_AB_XX_PWR_RST);
/* Wait up to 10 ms for completion, then reinitialise */
for (count = 0; count < 1000; count++) {
efx_reado(efx, &reg, FR_AB_XX_PWR_RST);
if (EFX_OWORD_FIELD(reg, FRF_AB_XX_RST_XX_EN) == 0 &&
EFX_OWORD_FIELD(reg, FRF_AB_XX_SD_RST_ACT) == 0) {
falcon_setup_xaui(efx);
return 0;
}
udelay(10);
}
netif_err(efx, hw, efx->net_dev,
"timed out waiting for XAUI/XGXS reset\n");
return -ETIMEDOUT;
}
static void falcon_ack_status_intr(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
efx_oword_t reg;
if ((efx_nic_rev(efx) != EFX_REV_FALCON_B0) || LOOPBACK_INTERNAL(efx))
return;
/* We expect xgmii faults if the wireside link is down */
if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up)
return;
/* We can only use this interrupt to signal the negative edge of
* xaui_align [we have to poll the positive edge]. */
if (nic_data->xmac_poll_required)
return;
efx_reado(efx, &reg, FR_AB_XM_MGT_INT_MSK);
}
static bool falcon_xgxs_link_ok(struct efx_nic *efx)
{
efx_oword_t reg;
bool align_done, link_ok = false;
int sync_status;
/* Read link status */
efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
align_done = EFX_OWORD_FIELD(reg, FRF_AB_XX_ALIGN_DONE);
sync_status = EFX_OWORD_FIELD(reg, FRF_AB_XX_SYNC_STAT);
if (align_done && (sync_status == FFE_AB_XX_STAT_ALL_LANES))
link_ok = true;
/* Clear link status ready for next read */
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_COMMA_DET, FFE_AB_XX_STAT_ALL_LANES);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_CHAR_ERR, FFE_AB_XX_STAT_ALL_LANES);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_DISPERR, FFE_AB_XX_STAT_ALL_LANES);
efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
return link_ok;
}
static bool falcon_xmac_link_ok(struct efx_nic *efx)
{
/*
* Check MAC's XGXS link status except when using XGMII loopback
* which bypasses the XGXS block.
* If possible, check PHY's XGXS link status except when using
* MAC loopback.
*/
return (efx->loopback_mode == LOOPBACK_XGMII ||
falcon_xgxs_link_ok(efx)) &&
(!(efx->mdio.mmds & (1 << MDIO_MMD_PHYXS)) ||
LOOPBACK_INTERNAL(efx) ||
efx_mdio_phyxgxs_lane_sync(efx));
}
static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
{
unsigned int max_frame_len;
efx_oword_t reg;
bool rx_fc = !!(efx->link_state.fc & EFX_FC_RX);
bool tx_fc = !!(efx->link_state.fc & EFX_FC_TX);
/* Configure MAC - cut-thru mode is hard wired on */
EFX_POPULATE_OWORD_3(reg,
FRF_AB_XM_RX_JUMBO_MODE, 1,
FRF_AB_XM_TX_STAT_EN, 1,
FRF_AB_XM_RX_STAT_EN, 1);
efx_writeo(efx, &reg, FR_AB_XM_GLB_CFG);
/* Configure TX */
EFX_POPULATE_OWORD_6(reg,
FRF_AB_XM_TXEN, 1,
FRF_AB_XM_TX_PRMBL, 1,
FRF_AB_XM_AUTO_PAD, 1,
FRF_AB_XM_TXCRC, 1,
FRF_AB_XM_FCNTL, tx_fc,
FRF_AB_XM_IPG, 0x3);
efx_writeo(efx, &reg, FR_AB_XM_TX_CFG);
/* Configure RX */
EFX_POPULATE_OWORD_5(reg,
FRF_AB_XM_RXEN, 1,
FRF_AB_XM_AUTO_DEPAD, 0,
FRF_AB_XM_ACPT_ALL_MCAST, 1,
FRF_AB_XM_ACPT_ALL_UCAST, efx->promiscuous,
FRF_AB_XM_PASS_CRC_ERR, 1);
efx_writeo(efx, &reg, FR_AB_XM_RX_CFG);
/* Set frame length */
max_frame_len = EFX_MAX_FRAME_LEN(efx->net_dev->mtu);
EFX_POPULATE_OWORD_1(reg, FRF_AB_XM_MAX_RX_FRM_SIZE, max_frame_len);
efx_writeo(efx, &reg, FR_AB_XM_RX_PARAM);
EFX_POPULATE_OWORD_2(reg,
FRF_AB_XM_MAX_TX_FRM_SIZE, max_frame_len,
FRF_AB_XM_TX_JUMBO_MODE, 1);
efx_writeo(efx, &reg, FR_AB_XM_TX_PARAM);
EFX_POPULATE_OWORD_2(reg,
FRF_AB_XM_PAUSE_TIME, 0xfffe, /* MAX PAUSE TIME */
FRF_AB_XM_DIS_FCNTL, !rx_fc);
efx_writeo(efx, &reg, FR_AB_XM_FC);
/* Set MAC address */
memcpy(&reg, &efx->net_dev->dev_addr[0], 4);
efx_writeo(efx, &reg, FR_AB_XM_ADR_LO);
memcpy(&reg, &efx->net_dev->dev_addr[4], 2);
efx_writeo(efx, &reg, FR_AB_XM_ADR_HI);
}
static void falcon_reconfigure_xgxs_core(struct efx_nic *efx)
{
efx_oword_t reg;
bool xgxs_loopback = (efx->loopback_mode == LOOPBACK_XGXS);
bool xaui_loopback = (efx->loopback_mode == LOOPBACK_XAUI);
bool xgmii_loopback = (efx->loopback_mode == LOOPBACK_XGMII);
/* XGXS block is flaky and will need to be reset if moving
* into our out of XGMII, XGXS or XAUI loopbacks. */
if (EFX_WORKAROUND_5147(efx)) {
bool old_xgmii_loopback, old_xgxs_loopback, old_xaui_loopback;
bool reset_xgxs;
efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
old_xgxs_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN);
old_xgmii_loopback =
EFX_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN);
efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
old_xaui_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_LPBKA);
/* The PHY driver may have turned XAUI off */
reset_xgxs = ((xgxs_loopback != old_xgxs_loopback) ||
(xaui_loopback != old_xaui_loopback) ||
(xgmii_loopback != old_xgmii_loopback));
if (reset_xgxs)
falcon_reset_xaui(efx);
}
efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_FORCE_SIG,
(xgxs_loopback || xaui_loopback) ?
FFE_AB_XX_FORCE_SIG_ALL_LANES : 0);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN, xgxs_loopback);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN, xgmii_loopback);
efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKD, xaui_loopback);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKC, xaui_loopback);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKB, xaui_loopback);
EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKA, xaui_loopback);
efx_writeo(efx, &reg, FR_AB_XX_SD_CTL);
}
/* Try to bring up the Falcon side of the Falcon-Phy XAUI link */
static bool falcon_xmac_link_ok_retry(struct efx_nic *efx, int tries)
{
bool mac_up = falcon_xmac_link_ok(efx);
if (LOOPBACK_MASK(efx) & LOOPBACKS_EXTERNAL(efx) & LOOPBACKS_WS ||
efx_phy_mode_disabled(efx->phy_mode))
/* XAUI link is expected to be down */
return mac_up;
falcon_stop_nic_stats(efx);
while (!mac_up && tries) {
netif_dbg(efx, hw, efx->net_dev, "bashing xaui\n");
falcon_reset_xaui(efx);
udelay(200);
mac_up = falcon_xmac_link_ok(efx);
--tries;
}
falcon_start_nic_stats(efx);
return mac_up;
}
bool falcon_xmac_check_fault(struct efx_nic *efx)
{
return !falcon_xmac_link_ok_retry(efx, 5);
}
int falcon_reconfigure_xmac(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
falcon_reconfigure_xgxs_core(efx);
falcon_reconfigure_xmac_core(efx);
falcon_reconfigure_mac_wrapper(efx);
nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 5);
falcon_ack_status_intr(efx);
return 0;
}
void falcon_update_stats_xmac(struct efx_nic *efx)
{
struct efx_mac_stats *mac_stats = &efx->mac_stats;
/* Update MAC stats from DMAed values */
FALCON_STAT(efx, XgRxOctets, rx_bytes);
FALCON_STAT(efx, XgRxOctetsOK, rx_good_bytes);
FALCON_STAT(efx, XgRxPkts, rx_packets);
FALCON_STAT(efx, XgRxPktsOK, rx_good);
FALCON_STAT(efx, XgRxBroadcastPkts, rx_broadcast);
FALCON_STAT(efx, XgRxMulticastPkts, rx_multicast);
FALCON_STAT(efx, XgRxUnicastPkts, rx_unicast);
FALCON_STAT(efx, XgRxUndersizePkts, rx_lt64);
FALCON_STAT(efx, XgRxOversizePkts, rx_gtjumbo);
FALCON_STAT(efx, XgRxJabberPkts, rx_bad_gtjumbo);
FALCON_STAT(efx, XgRxUndersizeFCSerrorPkts, rx_bad_lt64);
FALCON_STAT(efx, XgRxDropEvents, rx_overflow);
FALCON_STAT(efx, XgRxFCSerrorPkts, rx_bad);
FALCON_STAT(efx, XgRxAlignError, rx_align_error);
FALCON_STAT(efx, XgRxSymbolError, rx_symbol_error);
FALCON_STAT(efx, XgRxInternalMACError, rx_internal_error);
FALCON_STAT(efx, XgRxControlPkts, rx_control);
FALCON_STAT(efx, XgRxPausePkts, rx_pause);
FALCON_STAT(efx, XgRxPkts64Octets, rx_64);
FALCON_STAT(efx, XgRxPkts65to127Octets, rx_65_to_127);
FALCON_STAT(efx, XgRxPkts128to255Octets, rx_128_to_255);
FALCON_STAT(efx, XgRxPkts256to511Octets, rx_256_to_511);
FALCON_STAT(efx, XgRxPkts512to1023Octets, rx_512_to_1023);
FALCON_STAT(efx, XgRxPkts1024to15xxOctets, rx_1024_to_15xx);
FALCON_STAT(efx, XgRxPkts15xxtoMaxOctets, rx_15xx_to_jumbo);
FALCON_STAT(efx, XgRxLengthError, rx_length_error);
FALCON_STAT(efx, XgTxPkts, tx_packets);
FALCON_STAT(efx, XgTxOctets, tx_bytes);
FALCON_STAT(efx, XgTxMulticastPkts, tx_multicast);
FALCON_STAT(efx, XgTxBroadcastPkts, tx_broadcast);
FALCON_STAT(efx, XgTxUnicastPkts, tx_unicast);
FALCON_STAT(efx, XgTxControlPkts, tx_control);
FALCON_STAT(efx, XgTxPausePkts, tx_pause);
FALCON_STAT(efx, XgTxPkts64Octets, tx_64);
FALCON_STAT(efx, XgTxPkts65to127Octets, tx_65_to_127);
FALCON_STAT(efx, XgTxPkts128to255Octets, tx_128_to_255);
FALCON_STAT(efx, XgTxPkts256to511Octets, tx_256_to_511);
FALCON_STAT(efx, XgTxPkts512to1023Octets, tx_512_to_1023);
FALCON_STAT(efx, XgTxPkts1024to15xxOctets, tx_1024_to_15xx);
FALCON_STAT(efx, XgTxPkts1519toMaxOctets, tx_15xx_to_jumbo);
FALCON_STAT(efx, XgTxUndersizePkts, tx_lt64);
FALCON_STAT(efx, XgTxOversizePkts, tx_gtjumbo);
FALCON_STAT(efx, XgTxNonTcpUdpPkt, tx_non_tcpudp);
FALCON_STAT(efx, XgTxMacSrcErrPkt, tx_mac_src_error);
FALCON_STAT(efx, XgTxIpSrcErrPkt, tx_ip_src_error);
/* Update derived statistics */
efx_update_diff_stat(&mac_stats->tx_good_bytes,
mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
mac_stats->tx_control * 64);
efx_update_diff_stat(&mac_stats->rx_bad_bytes,
mac_stats->rx_bytes - mac_stats->rx_good_bytes -
mac_stats->rx_control * 64);
}
void falcon_poll_xmac(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up ||
!nic_data->xmac_poll_required)
return;
nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 1);
falcon_ack_status_intr(efx);
}
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