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brintos / linux-shallow public Read only

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1/*2 * Copyright (c) 2005-2008 Chelsio, Inc. All rights reserved.3 *4 * This software is available to you under a choice of one of two5 * licenses.  You may choose to be licensed under the terms of the GNU6 * General Public License (GPL) Version 2, available from the file7 * COPYING in the main directory of this source tree, or the8 * OpenIB.org BSD license below:9 *10 *     Redistribution and use in source and binary forms, with or11 *     without modification, are permitted provided that the following12 *     conditions are met:13 *14 *      - Redistributions of source code must retain the above15 *        copyright notice, this list of conditions and the following16 *        disclaimer.17 *18 *      - Redistributions in binary form must reproduce the above19 *        copyright notice, this list of conditions and the following20 *        disclaimer in the documentation and/or other materials21 *        provided with the distribution.22 *23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE30 * SOFTWARE.31 */32#include "common.h"33#include "regs.h"34 35/*36 * # of exact address filters.  The first one is used for the station address,37 * the rest are available for multicast addresses.38 */39#define EXACT_ADDR_FILTERS 840 41static inline int macidx(const struct cmac *mac)42{43	return mac->offset / (XGMAC0_1_BASE_ADDR - XGMAC0_0_BASE_ADDR);44}45 46static void xaui_serdes_reset(struct cmac *mac)47{48	static const unsigned int clear[] = {49		F_PWRDN0 | F_PWRDN1, F_RESETPLL01, F_RESET0 | F_RESET1,50		F_PWRDN2 | F_PWRDN3, F_RESETPLL23, F_RESET2 | F_RESET351	};52 53	int i;54	struct adapter *adap = mac->adapter;55	u32 ctrl = A_XGM_SERDES_CTRL0 + mac->offset;56 57	t3_write_reg(adap, ctrl, adap->params.vpd.xauicfg[macidx(mac)] |58		     F_RESET3 | F_RESET2 | F_RESET1 | F_RESET0 |59		     F_PWRDN3 | F_PWRDN2 | F_PWRDN1 | F_PWRDN0 |60		     F_RESETPLL23 | F_RESETPLL01);61	t3_read_reg(adap, ctrl);62	udelay(15);63 64	for (i = 0; i < ARRAY_SIZE(clear); i++) {65		t3_set_reg_field(adap, ctrl, clear[i], 0);66		udelay(15);67	}68}69 70void t3b_pcs_reset(struct cmac *mac)71{72	t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset,73			 F_PCS_RESET_, 0);74	udelay(20);75	t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset, 0,76			 F_PCS_RESET_);77}78 79int t3_mac_reset(struct cmac *mac)80{81	static const struct addr_val_pair mac_reset_avp[] = {82		{A_XGM_TX_CTRL, 0},83		{A_XGM_RX_CTRL, 0},84		{A_XGM_RX_CFG, F_DISPAUSEFRAMES | F_EN1536BFRAMES |85		 F_RMFCS | F_ENJUMBO | F_ENHASHMCAST},86		{A_XGM_RX_HASH_LOW, 0},87		{A_XGM_RX_HASH_HIGH, 0},88		{A_XGM_RX_EXACT_MATCH_LOW_1, 0},89		{A_XGM_RX_EXACT_MATCH_LOW_2, 0},90		{A_XGM_RX_EXACT_MATCH_LOW_3, 0},91		{A_XGM_RX_EXACT_MATCH_LOW_4, 0},92		{A_XGM_RX_EXACT_MATCH_LOW_5, 0},93		{A_XGM_RX_EXACT_MATCH_LOW_6, 0},94		{A_XGM_RX_EXACT_MATCH_LOW_7, 0},95		{A_XGM_RX_EXACT_MATCH_LOW_8, 0},96		{A_XGM_STAT_CTRL, F_CLRSTATS}97	};98	u32 val;99	struct adapter *adap = mac->adapter;100	unsigned int oft = mac->offset;101 102	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, F_MAC_RESET_);103	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);	/* flush */104 105	t3_write_regs(adap, mac_reset_avp, ARRAY_SIZE(mac_reset_avp), oft);106	t3_set_reg_field(adap, A_XGM_RXFIFO_CFG + oft,107			 F_RXSTRFRWRD | F_DISERRFRAMES,108			 uses_xaui(adap) ? 0 : F_RXSTRFRWRD);109	t3_set_reg_field(adap, A_XGM_TXFIFO_CFG + oft, 0, F_UNDERUNFIX);110 111	if (uses_xaui(adap)) {112		if (adap->params.rev == 0) {113			t3_set_reg_field(adap, A_XGM_SERDES_CTRL + oft, 0,114					 F_RXENABLE | F_TXENABLE);115			if (t3_wait_op_done(adap, A_XGM_SERDES_STATUS1 + oft,116					    F_CMULOCK, 1, 5, 2)) {117				CH_ERR(adap,118				       "MAC %d XAUI SERDES CMU lock failed\n",119				       macidx(mac));120				return -1;121			}122			t3_set_reg_field(adap, A_XGM_SERDES_CTRL + oft, 0,123					 F_SERDESRESET_);124		} else125			xaui_serdes_reset(mac);126	}127 128	t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + oft,129			 V_RXMAXFRAMERSIZE(M_RXMAXFRAMERSIZE),130			 V_RXMAXFRAMERSIZE(MAX_FRAME_SIZE) | F_RXENFRAMER);131	val = F_MAC_RESET_ | F_XGMAC_STOP_EN;132 133	if (is_10G(adap))134		val |= F_PCS_RESET_;135	else if (uses_xaui(adap))136		val |= F_PCS_RESET_ | F_XG2G_RESET_;137	else138		val |= F_RGMII_RESET_ | F_XG2G_RESET_;139	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, val);140	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);	/* flush */141	if ((val & F_PCS_RESET_) && adap->params.rev) {142		msleep(1);143		t3b_pcs_reset(mac);144	}145 146	memset(&mac->stats, 0, sizeof(mac->stats));147	return 0;148}149 150static int t3b2_mac_reset(struct cmac *mac)151{152	struct adapter *adap = mac->adapter;153	unsigned int oft = mac->offset, store;154	int idx = macidx(mac);155	u32 val;156 157	if (!macidx(mac))158		t3_set_reg_field(adap, A_MPS_CFG, F_PORT0ACTIVE, 0);159	else160		t3_set_reg_field(adap, A_MPS_CFG, F_PORT1ACTIVE, 0);161 162	/* Stop NIC traffic to reduce the number of TXTOGGLES */163	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 0);164	/* Ensure TX drains */165	t3_set_reg_field(adap, A_XGM_TX_CFG + oft, F_TXPAUSEEN, 0);166 167	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, F_MAC_RESET_);168	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);    /* flush */169 170	/* Store A_TP_TX_DROP_CFG_CH0 */171	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);172	store = t3_read_reg(adap, A_TP_TX_DROP_CFG_CH0 + idx);173 174	msleep(10);175 176	/* Change DROP_CFG to 0xc0000011 */177	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);178	t3_write_reg(adap, A_TP_PIO_DATA, 0xc0000011);179 180	/* Check for xgm Rx fifo empty */181	/* Increased loop count to 1000 from 5 cover 1G and 100Mbps case */182	if (t3_wait_op_done(adap, A_XGM_RX_MAX_PKT_SIZE_ERR_CNT + oft,183			    0x80000000, 1, 1000, 2)) {184		CH_ERR(adap, "MAC %d Rx fifo drain failed\n",185		       macidx(mac));186		return -1;187	}188 189	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, 0);190	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);    /* flush */191 192	val = F_MAC_RESET_;193	if (is_10G(adap))194		val |= F_PCS_RESET_;195	else if (uses_xaui(adap))196		val |= F_PCS_RESET_ | F_XG2G_RESET_;197	else198		val |= F_RGMII_RESET_ | F_XG2G_RESET_;199	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, val);200	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);  /* flush */201	if ((val & F_PCS_RESET_) && adap->params.rev) {202		msleep(1);203		t3b_pcs_reset(mac);204	}205	t3_write_reg(adap, A_XGM_RX_CFG + oft,206		     F_DISPAUSEFRAMES | F_EN1536BFRAMES |207		     F_RMFCS | F_ENJUMBO | F_ENHASHMCAST);208 209	/* Restore the DROP_CFG */210	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);211	t3_write_reg(adap, A_TP_PIO_DATA, store);212 213	if (!idx)214		t3_set_reg_field(adap, A_MPS_CFG, 0, F_PORT0ACTIVE);215	else216		t3_set_reg_field(adap, A_MPS_CFG, 0, F_PORT1ACTIVE);217 218	/* re-enable nic traffic */219	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 1);220 221	/*  Set: re-enable NIC traffic */222	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 1);223 224	return 0;225}226 227/*228 * Set the exact match register 'idx' to recognize the given Ethernet address.229 */230static void set_addr_filter(struct cmac *mac, int idx, const u8 * addr)231{232	u32 addr_lo, addr_hi;233	unsigned int oft = mac->offset + idx * 8;234 235	addr_lo = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];236	addr_hi = (addr[5] << 8) | addr[4];237 238	t3_write_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1 + oft, addr_lo);239	t3_write_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_HIGH_1 + oft, addr_hi);240}241 242/* Set one of the station's unicast MAC addresses. */243int t3_mac_set_address(struct cmac *mac, unsigned int idx, const u8 addr[6])244{245	if (idx >= mac->nucast)246		return -EINVAL;247	set_addr_filter(mac, idx, addr);248	return 0;249}250 251/*252 * Specify the number of exact address filters that should be reserved for253 * unicast addresses.  Caller should reload the unicast and multicast addresses254 * after calling this.255 */256int t3_mac_set_num_ucast(struct cmac *mac, int n)257{258	if (n > EXACT_ADDR_FILTERS)259		return -EINVAL;260	mac->nucast = n;261	return 0;262}263 264void t3_mac_disable_exact_filters(struct cmac *mac)265{266	unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_LOW_1;267 268	for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {269		u32 v = t3_read_reg(mac->adapter, reg);270		t3_write_reg(mac->adapter, reg, v);271	}272	t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1);	/* flush */273}274 275void t3_mac_enable_exact_filters(struct cmac *mac)276{277	unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_HIGH_1;278 279	for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {280		u32 v = t3_read_reg(mac->adapter, reg);281		t3_write_reg(mac->adapter, reg, v);282	}283	t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1);	/* flush */284}285 286/* Calculate the RX hash filter index of an Ethernet address */287static int hash_hw_addr(const u8 * addr)288{289	int hash = 0, octet, bit, i = 0, c;290 291	for (octet = 0; octet < 6; ++octet)292		for (c = addr[octet], bit = 0; bit < 8; c >>= 1, ++bit) {293			hash ^= (c & 1) << i;294			if (++i == 6)295				i = 0;296		}297	return hash;298}299 300int t3_mac_set_rx_mode(struct cmac *mac, struct net_device *dev)301{302	u32 val, hash_lo, hash_hi;303	struct adapter *adap = mac->adapter;304	unsigned int oft = mac->offset;305 306	val = t3_read_reg(adap, A_XGM_RX_CFG + oft) & ~F_COPYALLFRAMES;307	if (dev->flags & IFF_PROMISC)308		val |= F_COPYALLFRAMES;309	t3_write_reg(adap, A_XGM_RX_CFG + oft, val);310 311	if (dev->flags & IFF_ALLMULTI)312		hash_lo = hash_hi = 0xffffffff;313	else {314		struct netdev_hw_addr *ha;315		int exact_addr_idx = mac->nucast;316 317		hash_lo = hash_hi = 0;318		netdev_for_each_mc_addr(ha, dev)319			if (exact_addr_idx < EXACT_ADDR_FILTERS)320				set_addr_filter(mac, exact_addr_idx++,321						ha->addr);322			else {323				int hash = hash_hw_addr(ha->addr);324 325				if (hash < 32)326					hash_lo |= (1 << hash);327				else328					hash_hi |= (1 << (hash - 32));329			}330	}331 332	t3_write_reg(adap, A_XGM_RX_HASH_LOW + oft, hash_lo);333	t3_write_reg(adap, A_XGM_RX_HASH_HIGH + oft, hash_hi);334	return 0;335}336 337static int rx_fifo_hwm(int mtu)338{339	int hwm;340 341	hwm = max(MAC_RXFIFO_SIZE - 3 * mtu, (MAC_RXFIFO_SIZE * 38) / 100);342	return min(hwm, MAC_RXFIFO_SIZE - 8192);343}344 345int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)346{347	int hwm, lwm, divisor;348	int ipg;349	unsigned int thres, v, reg;350	struct adapter *adap = mac->adapter;351 352	/*353	 * MAX_FRAME_SIZE inludes header + FCS, mtu doesn't.  The HW max354	 * packet size register includes header, but not FCS.355	 */356	mtu += 14;357	if (mtu > 1536)358		mtu += 4;359 360	if (mtu > MAX_FRAME_SIZE - 4)361		return -EINVAL;362	t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);363 364	if (adap->params.rev >= T3_REV_B2 &&365	    (t3_read_reg(adap, A_XGM_RX_CTRL + mac->offset) & F_RXEN)) {366		t3_mac_disable_exact_filters(mac);367		v = t3_read_reg(adap, A_XGM_RX_CFG + mac->offset);368		t3_set_reg_field(adap, A_XGM_RX_CFG + mac->offset,369				 F_ENHASHMCAST | F_COPYALLFRAMES, F_DISBCAST);370 371		reg = adap->params.rev == T3_REV_B2 ?372			A_XGM_RX_MAX_PKT_SIZE_ERR_CNT : A_XGM_RXFIFO_CFG;373 374		/* drain RX FIFO */375		if (t3_wait_op_done(adap, reg + mac->offset,376				    F_RXFIFO_EMPTY, 1, 20, 5)) {377			t3_write_reg(adap, A_XGM_RX_CFG + mac->offset, v);378			t3_mac_enable_exact_filters(mac);379			return -EIO;380		}381		t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset,382				 V_RXMAXPKTSIZE(M_RXMAXPKTSIZE),383				 V_RXMAXPKTSIZE(mtu));384		t3_write_reg(adap, A_XGM_RX_CFG + mac->offset, v);385		t3_mac_enable_exact_filters(mac);386	} else387		t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset,388				 V_RXMAXPKTSIZE(M_RXMAXPKTSIZE),389				 V_RXMAXPKTSIZE(mtu));390 391	/*392	 * Adjust the PAUSE frame watermarks.  We always set the LWM, and the393	 * HWM only if flow-control is enabled.394	 */395	hwm = rx_fifo_hwm(mtu);396	lwm = min(3 * (int)mtu, MAC_RXFIFO_SIZE / 4);397	v = t3_read_reg(adap, A_XGM_RXFIFO_CFG + mac->offset);398	v &= ~V_RXFIFOPAUSELWM(M_RXFIFOPAUSELWM);399	v |= V_RXFIFOPAUSELWM(lwm / 8);400	if (G_RXFIFOPAUSEHWM(v))401		v = (v & ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM)) |402		    V_RXFIFOPAUSEHWM(hwm / 8);403 404	t3_write_reg(adap, A_XGM_RXFIFO_CFG + mac->offset, v);405 406	/* Adjust the TX FIFO threshold based on the MTU */407	thres = (adap->params.vpd.cclk * 1000) / 15625;408	thres = (thres * mtu) / 1000;409	if (is_10G(adap))410		thres /= 10;411	thres = mtu > thres ? (mtu - thres + 7) / 8 : 0;412	thres = max(thres, 8U);	/* need at least 8 */413	ipg = (adap->params.rev == T3_REV_C) ? 0 : 1;414	t3_set_reg_field(adap, A_XGM_TXFIFO_CFG + mac->offset,415			 V_TXFIFOTHRESH(M_TXFIFOTHRESH) | V_TXIPG(M_TXIPG),416			 V_TXFIFOTHRESH(thres) | V_TXIPG(ipg));417 418	if (adap->params.rev > 0) {419		divisor = (adap->params.rev == T3_REV_C) ? 64 : 8;420		t3_write_reg(adap, A_XGM_PAUSE_TIMER + mac->offset,421			     (hwm - lwm) * 4 / divisor);422	}423	t3_write_reg(adap, A_XGM_TX_PAUSE_QUANTA + mac->offset,424		     MAC_RXFIFO_SIZE * 4 * 8 / 512);425	return 0;426}427 428int t3_mac_set_speed_duplex_fc(struct cmac *mac, int speed, int duplex, int fc)429{430	u32 val;431	struct adapter *adap = mac->adapter;432	unsigned int oft = mac->offset;433 434	if (duplex >= 0 && duplex != DUPLEX_FULL)435		return -EINVAL;436	if (speed >= 0) {437		if (speed == SPEED_10)438			val = V_PORTSPEED(0);439		else if (speed == SPEED_100)440			val = V_PORTSPEED(1);441		else if (speed == SPEED_1000)442			val = V_PORTSPEED(2);443		else if (speed == SPEED_10000)444			val = V_PORTSPEED(3);445		else446			return -EINVAL;447 448		t3_set_reg_field(adap, A_XGM_PORT_CFG + oft,449				 V_PORTSPEED(M_PORTSPEED), val);450	}451 452	val = t3_read_reg(adap, A_XGM_RXFIFO_CFG + oft);453	val &= ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM);454	if (fc & PAUSE_TX) {455		u32 rx_max_pkt_size =456		    G_RXMAXPKTSIZE(t3_read_reg(adap,457					       A_XGM_RX_MAX_PKT_SIZE + oft));458		val |= V_RXFIFOPAUSEHWM(rx_fifo_hwm(rx_max_pkt_size) / 8);459	}460	t3_write_reg(adap, A_XGM_RXFIFO_CFG + oft, val);461 462	t3_set_reg_field(adap, A_XGM_TX_CFG + oft, F_TXPAUSEEN,463			 (fc & PAUSE_RX) ? F_TXPAUSEEN : 0);464	return 0;465}466 467int t3_mac_enable(struct cmac *mac, int which)468{469	int idx = macidx(mac);470	struct adapter *adap = mac->adapter;471	unsigned int oft = mac->offset;472	struct mac_stats *s = &mac->stats;473 474	if (which & MAC_DIRECTION_TX) {475		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);476		t3_write_reg(adap, A_TP_PIO_DATA,477			     adap->params.rev == T3_REV_C ?478			     0xc4ffff01 : 0xc0ede401);479		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_MODE);480		t3_set_reg_field(adap, A_TP_PIO_DATA, 1 << idx,481				 adap->params.rev == T3_REV_C ? 0 : 1 << idx);482 483		t3_write_reg(adap, A_XGM_TX_CTRL + oft, F_TXEN);484 485		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CNT_CH0 + idx);486		mac->tx_mcnt = s->tx_frames;487		mac->tx_tcnt = (G_TXDROPCNTCH0RCVD(t3_read_reg(adap,488							A_TP_PIO_DATA)));489		mac->tx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,490						A_XGM_TX_SPI4_SOP_EOP_CNT +491						oft)));492		mac->rx_mcnt = s->rx_frames;493		mac->rx_pause = s->rx_pause;494		mac->rx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,495						A_XGM_RX_SPI4_SOP_EOP_CNT +496						oft)));497		mac->rx_ocnt = s->rx_fifo_ovfl;498		mac->txen = F_TXEN;499		mac->toggle_cnt = 0;500	}501	if (which & MAC_DIRECTION_RX)502		t3_write_reg(adap, A_XGM_RX_CTRL + oft, F_RXEN);503	return 0;504}505 506int t3_mac_disable(struct cmac *mac, int which)507{508	struct adapter *adap = mac->adapter;509 510	if (which & MAC_DIRECTION_TX) {511		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, 0);512		mac->txen = 0;513	}514	if (which & MAC_DIRECTION_RX) {515		int val = F_MAC_RESET_;516 517		t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset,518				 F_PCS_RESET_, 0);519		msleep(100);520		t3_write_reg(adap, A_XGM_RX_CTRL + mac->offset, 0);521		if (is_10G(adap))522			val |= F_PCS_RESET_;523		else if (uses_xaui(adap))524			val |= F_PCS_RESET_ | F_XG2G_RESET_;525		else526			val |= F_RGMII_RESET_ | F_XG2G_RESET_;527		t3_write_reg(mac->adapter, A_XGM_RESET_CTRL + mac->offset, val);528	}529	return 0;530}531 532int t3b2_mac_watchdog_task(struct cmac *mac)533{534	struct adapter *adap = mac->adapter;535	struct mac_stats *s = &mac->stats;536	unsigned int tx_tcnt, tx_xcnt;537	u64 tx_mcnt = s->tx_frames;538	int status;539 540	status = 0;541	tx_xcnt = 1;		/* By default tx_xcnt is making progress */542	tx_tcnt = mac->tx_tcnt;	/* If tx_mcnt is progressing ignore tx_tcnt */543	if (tx_mcnt == mac->tx_mcnt && mac->rx_pause == s->rx_pause) {544		tx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,545						A_XGM_TX_SPI4_SOP_EOP_CNT +546					       	mac->offset)));547		if (tx_xcnt == 0) {548			t3_write_reg(adap, A_TP_PIO_ADDR,549				     A_TP_TX_DROP_CNT_CH0 + macidx(mac));550			tx_tcnt = (G_TXDROPCNTCH0RCVD(t3_read_reg(adap,551						      A_TP_PIO_DATA)));552		} else {553			goto out;554		}555	} else {556		mac->toggle_cnt = 0;557		goto out;558	}559 560	if ((tx_tcnt != mac->tx_tcnt) && (mac->tx_xcnt == 0)) {561		if (mac->toggle_cnt > 4) {562			status = 2;563			goto out;564		} else {565			status = 1;566			goto out;567		}568	} else {569		mac->toggle_cnt = 0;570		goto out;571	}572 573out:574	mac->tx_tcnt = tx_tcnt;575	mac->tx_xcnt = tx_xcnt;576	mac->tx_mcnt = s->tx_frames;577	mac->rx_pause = s->rx_pause;578	if (status == 1) {579		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, 0);580		t3_read_reg(adap, A_XGM_TX_CTRL + mac->offset);  /* flush */581		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, mac->txen);582		t3_read_reg(adap, A_XGM_TX_CTRL + mac->offset);  /* flush */583		mac->toggle_cnt++;584	} else if (status == 2) {585		t3b2_mac_reset(mac);586		mac->toggle_cnt = 0;587	}588	return status;589}590 591/*592 * This function is called periodically to accumulate the current values of the593 * RMON counters into the port statistics.  Since the packet counters are only594 * 32 bits they can overflow in ~286 secs at 10G, so the function should be595 * called more frequently than that.  The byte counters are 45-bit wide, they596 * would overflow in ~7.8 hours.597 */598const struct mac_stats *t3_mac_update_stats(struct cmac *mac)599{600#define RMON_READ(mac, addr) t3_read_reg(mac->adapter, addr + mac->offset)601#define RMON_UPDATE(mac, name, reg) \602	(mac)->stats.name += (u64)RMON_READ(mac, A_XGM_STAT_##reg)603#define RMON_UPDATE64(mac, name, reg_lo, reg_hi) \604	(mac)->stats.name += RMON_READ(mac, A_XGM_STAT_##reg_lo) + \605			     ((u64)RMON_READ(mac, A_XGM_STAT_##reg_hi) << 32)606 607	u32 v, lo;608 609	RMON_UPDATE64(mac, rx_octets, RX_BYTES_LOW, RX_BYTES_HIGH);610	RMON_UPDATE64(mac, rx_frames, RX_FRAMES_LOW, RX_FRAMES_HIGH);611	RMON_UPDATE(mac, rx_mcast_frames, RX_MCAST_FRAMES);612	RMON_UPDATE(mac, rx_bcast_frames, RX_BCAST_FRAMES);613	RMON_UPDATE(mac, rx_fcs_errs, RX_CRC_ERR_FRAMES);614	RMON_UPDATE(mac, rx_pause, RX_PAUSE_FRAMES);615	RMON_UPDATE(mac, rx_jabber, RX_JABBER_FRAMES);616	RMON_UPDATE(mac, rx_short, RX_SHORT_FRAMES);617	RMON_UPDATE(mac, rx_symbol_errs, RX_SYM_CODE_ERR_FRAMES);618 619	RMON_UPDATE(mac, rx_too_long, RX_OVERSIZE_FRAMES);620 621	v = RMON_READ(mac, A_XGM_RX_MAX_PKT_SIZE_ERR_CNT);622	if (mac->adapter->params.rev == T3_REV_B2)623		v &= 0x7fffffff;624	mac->stats.rx_too_long += v;625 626	RMON_UPDATE(mac, rx_frames_64, RX_64B_FRAMES);627	RMON_UPDATE(mac, rx_frames_65_127, RX_65_127B_FRAMES);628	RMON_UPDATE(mac, rx_frames_128_255, RX_128_255B_FRAMES);629	RMON_UPDATE(mac, rx_frames_256_511, RX_256_511B_FRAMES);630	RMON_UPDATE(mac, rx_frames_512_1023, RX_512_1023B_FRAMES);631	RMON_UPDATE(mac, rx_frames_1024_1518, RX_1024_1518B_FRAMES);632	RMON_UPDATE(mac, rx_frames_1519_max, RX_1519_MAXB_FRAMES);633 634	RMON_UPDATE64(mac, tx_octets, TX_BYTE_LOW, TX_BYTE_HIGH);635	RMON_UPDATE64(mac, tx_frames, TX_FRAME_LOW, TX_FRAME_HIGH);636	RMON_UPDATE(mac, tx_mcast_frames, TX_MCAST);637	RMON_UPDATE(mac, tx_bcast_frames, TX_BCAST);638	RMON_UPDATE(mac, tx_pause, TX_PAUSE);639	/* This counts error frames in general (bad FCS, underrun, etc). */640	RMON_UPDATE(mac, tx_underrun, TX_ERR_FRAMES);641 642	RMON_UPDATE(mac, tx_frames_64, TX_64B_FRAMES);643	RMON_UPDATE(mac, tx_frames_65_127, TX_65_127B_FRAMES);644	RMON_UPDATE(mac, tx_frames_128_255, TX_128_255B_FRAMES);645	RMON_UPDATE(mac, tx_frames_256_511, TX_256_511B_FRAMES);646	RMON_UPDATE(mac, tx_frames_512_1023, TX_512_1023B_FRAMES);647	RMON_UPDATE(mac, tx_frames_1024_1518, TX_1024_1518B_FRAMES);648	RMON_UPDATE(mac, tx_frames_1519_max, TX_1519_MAXB_FRAMES);649 650	/* The next stat isn't clear-on-read. */651	t3_write_reg(mac->adapter, A_TP_MIB_INDEX, mac->offset ? 51 : 50);652	v = t3_read_reg(mac->adapter, A_TP_MIB_RDATA);653	lo = (u32) mac->stats.rx_cong_drops;654	mac->stats.rx_cong_drops += (u64) (v - lo);655 656	return &mac->stats;657}658