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/*******************************************************************************

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2010 Intel Corporation.

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  This program is free software; you can redistribute it and/or modify it

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  under the terms and conditions of the GNU General Public License,

     8

  version 2, as published by the Free Software Foundation.

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  This program is distributed in the hope it will be useful, but WITHOUT

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  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

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  more details.

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    15

  You should have received a copy of the GNU General Public License along with

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  this program; if not, write to the Free Software Foundation, Inc.,

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  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

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  The full GNU General Public License is included in this distribution in

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  the file called "COPYING".

    21

    22

  Contact Information:

    23

  Linux NICS <linux.nics@intel.com>

    24

  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

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  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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    27

*******************************************************************************/

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/* ethtool support for e1000 */

    30

    31

#include <linux/netdevice.h>

    32

#include <linux/ethtool.h>

    33

#include <linux/pci.h>

    34

#include <linux/slab.h>

    35

#include <linux/delay.h>

    36

    37

#include "e1000.h"

    38

    39

enum {NETDEV_STATS, E1000_STATS};

    40

    41

struct e1000_stats {

    42

	char stat_string[ETH_GSTRING_LEN];

    43

	int type;

    44

	int sizeof_stat;

    45

	int stat_offset;

    46

};

    47

    48

#define E1000_STAT(m)		E1000_STATS, \

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				sizeof(((struct e1000_adapter *)0)->m), \

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		      		offsetof(struct e1000_adapter, m)

    51

#define E1000_NETDEV_STAT(m)	NETDEV_STATS, \

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				sizeof(((struct net_device *)0)->m), \

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				offsetof(struct net_device, m)

    54

    55

static const struct e1000_stats e1000_gstrings_stats[] = {

    56

	{ "rx_packets", E1000_STAT(stats.gprc) },

    57

	{ "tx_packets", E1000_STAT(stats.gptc) },

    58

	{ "rx_bytes", E1000_STAT(stats.gorc) },

    59

	{ "tx_bytes", E1000_STAT(stats.gotc) },

    60

	{ "rx_broadcast", E1000_STAT(stats.bprc) },

    61

	{ "tx_broadcast", E1000_STAT(stats.bptc) },

    62

	{ "rx_multicast", E1000_STAT(stats.mprc) },

    63

	{ "tx_multicast", E1000_STAT(stats.mptc) },

    64

	{ "rx_errors", E1000_NETDEV_STAT(stats.rx_errors) },

    65

	{ "tx_errors", E1000_NETDEV_STAT(stats.tx_errors) },

    66

	{ "tx_dropped", E1000_NETDEV_STAT(stats.tx_dropped) },

    67

	{ "multicast", E1000_STAT(stats.mprc) },

    68

	{ "collisions", E1000_STAT(stats.colc) },

    69

	{ "rx_length_errors", E1000_NETDEV_STAT(stats.rx_length_errors) },

    70

	{ "rx_over_errors", E1000_NETDEV_STAT(stats.rx_over_errors) },

    71

	{ "rx_crc_errors", E1000_STAT(stats.crcerrs) },

    72

	{ "rx_frame_errors", E1000_NETDEV_STAT(stats.rx_frame_errors) },

    73

	{ "rx_no_buffer_count", E1000_STAT(stats.rnbc) },

    74

	{ "rx_missed_errors", E1000_STAT(stats.mpc) },

    75

	{ "tx_aborted_errors", E1000_STAT(stats.ecol) },

    76

	{ "tx_carrier_errors", E1000_STAT(stats.tncrs) },

    77

	{ "tx_fifo_errors", E1000_NETDEV_STAT(stats.tx_fifo_errors) },

    78

	{ "tx_heartbeat_errors", E1000_NETDEV_STAT(stats.tx_heartbeat_errors) },

    79

	{ "tx_window_errors", E1000_STAT(stats.latecol) },

    80

	{ "tx_abort_late_coll", E1000_STAT(stats.latecol) },

    81

	{ "tx_deferred_ok", E1000_STAT(stats.dc) },

    82

	{ "tx_single_coll_ok", E1000_STAT(stats.scc) },

    83

	{ "tx_multi_coll_ok", E1000_STAT(stats.mcc) },

    84

	{ "tx_timeout_count", E1000_STAT(tx_timeout_count) },

    85

	{ "tx_restart_queue", E1000_STAT(restart_queue) },

    86

	{ "rx_long_length_errors", E1000_STAT(stats.roc) },

    87

	{ "rx_short_length_errors", E1000_STAT(stats.ruc) },

    88

	{ "rx_align_errors", E1000_STAT(stats.algnerrc) },

    89

	{ "tx_tcp_seg_good", E1000_STAT(stats.tsctc) },

    90

	{ "tx_tcp_seg_failed", E1000_STAT(stats.tsctfc) },

    91

	{ "rx_flow_control_xon", E1000_STAT(stats.xonrxc) },

    92

	{ "rx_flow_control_xoff", E1000_STAT(stats.xoffrxc) },

    93

	{ "tx_flow_control_xon", E1000_STAT(stats.xontxc) },

    94

	{ "tx_flow_control_xoff", E1000_STAT(stats.xofftxc) },

    95

	{ "rx_long_byte_count", E1000_STAT(stats.gorc) },

    96

	{ "rx_csum_offload_good", E1000_STAT(hw_csum_good) },

    97

	{ "rx_csum_offload_errors", E1000_STAT(hw_csum_err) },

    98

	{ "rx_header_split", E1000_STAT(rx_hdr_split) },

    99

	{ "alloc_rx_buff_failed", E1000_STAT(alloc_rx_buff_failed) },

   100

	{ "tx_smbus", E1000_STAT(stats.mgptc) },

   101

	{ "rx_smbus", E1000_STAT(stats.mgprc) },

   102

	{ "dropped_smbus", E1000_STAT(stats.mgpdc) },

   103

	{ "rx_dma_failed", E1000_STAT(rx_dma_failed) },

   104

	{ "tx_dma_failed", E1000_STAT(tx_dma_failed) },

   105

};

   106

   107

#define E1000_GLOBAL_STATS_LEN	ARRAY_SIZE(e1000_gstrings_stats)

   108

#define E1000_STATS_LEN (E1000_GLOBAL_STATS_LEN)

   109

static const char e1000_gstrings_test[][ETH_GSTRING_LEN] = {

   110

	"Register test  (offline)", "Eeprom test    (offline)",

   111

	"Interrupt test (offline)", "Loopback test  (offline)",

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	"Link test   (on/offline)"

   113

};

   114

#define E1000_TEST_LEN ARRAY_SIZE(e1000_gstrings_test)

   115

   116

static int e1000_get_settings(struct net_device *netdev,

   117

			      struct ethtool_cmd *ecmd)

   118

{

   119

	struct e1000_adapter *adapter = netdev_priv(netdev);

   120

	struct e1000_hw *hw = &adapter->hw;

   121

   122

	if (hw->phy.media_type == e1000_media_type_copper) {

   123

   124

		ecmd->supported = (SUPPORTED_10baseT_Half |

   125

				   SUPPORTED_10baseT_Full |

   126

				   SUPPORTED_100baseT_Half |

   127

				   SUPPORTED_100baseT_Full |

   128

				   SUPPORTED_1000baseT_Full |

   129

				   SUPPORTED_Autoneg |

   130

				   SUPPORTED_TP);

   131

		if (hw->phy.type == e1000_phy_ife)

   132

			ecmd->supported &= ~SUPPORTED_1000baseT_Full;

   133

		ecmd->advertising = ADVERTISED_TP;

   134

   135

		if (hw->mac.autoneg == 1) {

   136

			ecmd->advertising |= ADVERTISED_Autoneg;

   137

			/* the e1000 autoneg seems to match ethtool nicely */

   138

			ecmd->advertising |= hw->phy.autoneg_advertised;

   139

		}

   140

   141

		ecmd->port = PORT_TP;

   142

		ecmd->phy_address = hw->phy.addr;

   143

		ecmd->transceiver = XCVR_INTERNAL;

   144

   145

	} else {

   146

		ecmd->supported   = (SUPPORTED_1000baseT_Full |

   147

				     SUPPORTED_FIBRE |

   148

				     SUPPORTED_Autoneg);

   149

   150

		ecmd->advertising = (ADVERTISED_1000baseT_Full |

   151

				     ADVERTISED_FIBRE |

   152

				     ADVERTISED_Autoneg);

   153

   154

		ecmd->port = PORT_FIBRE;

   155

		ecmd->transceiver = XCVR_EXTERNAL;

   156

	}

   157

   158

	ecmd->speed = -1;

   159

	ecmd->duplex = -1;

   160

   161

	if (netif_running(netdev)) {

   162

		if (netif_carrier_ok(netdev)) {

   163

			ecmd->speed = adapter->link_speed;

   164

			ecmd->duplex = adapter->link_duplex - 1;

   165

		}

   166

	} else {

   167

		u32 status = er32(STATUS);

   168

		if (status & E1000_STATUS_LU) {

   169

			if (status & E1000_STATUS_SPEED_1000)

   170

				ecmd->speed = 1000;

   171

			else if (status & E1000_STATUS_SPEED_100)

   172

				ecmd->speed = 100;

   173

			else

   174

				ecmd->speed = 10;

   175

   176

			if (status & E1000_STATUS_FD)

   177

				ecmd->duplex = DUPLEX_FULL;

   178

			else

   179

				ecmd->duplex = DUPLEX_HALF;

   180

		}

   181

	}

   182

   183

	ecmd->autoneg = ((hw->phy.media_type == e1000_media_type_fiber) ||

   184

			 hw->mac.autoneg) ? AUTONEG_ENABLE : AUTONEG_DISABLE;

   185

   186

	/* MDI-X => 2; MDI =>1; Invalid =>0 */

   187

	if ((hw->phy.media_type == e1000_media_type_copper) &&

   188

	    netif_carrier_ok(netdev))

   189

		ecmd->eth_tp_mdix = hw->phy.is_mdix ? ETH_TP_MDI_X :

   190

		                                      ETH_TP_MDI;

   191

	else

   192

		ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;

   193

   194

	return 0;

   195

}

   196

   197

static u32 e1000_get_link(struct net_device *netdev)

   198

{

   199

	struct e1000_adapter *adapter = netdev_priv(netdev);

   200

	struct e1000_hw *hw = &adapter->hw;

   201

   202

	/*

   203

	 * Avoid touching hardware registers when possible, otherwise

   204

	 * link negotiation can get messed up when user-level scripts

   205

	 * are rapidly polling the driver to see if link is up.

   206

	 */

   207

	return netif_running(netdev) ? netif_carrier_ok(netdev) :

   208

	    !!(er32(STATUS) & E1000_STATUS_LU);

   209

}

   210

   211

static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx)

   212

{

   213

	struct e1000_mac_info *mac = &adapter->hw.mac;

   214

   215

	mac->autoneg = 0;

   216

   217

	/* Fiber NICs only allow 1000 gbps Full duplex */

   218

	if ((adapter->hw.phy.media_type == e1000_media_type_fiber) &&

   219

		spddplx != (SPEED_1000 + DUPLEX_FULL)) {

   220

		e_err("Unsupported Speed/Duplex configuration\n");

   221

		return -EINVAL;

   222

	}

   223

   224

	switch (spddplx) {

   225

	case SPEED_10 + DUPLEX_HALF:

   226

		mac->forced_speed_duplex = ADVERTISE_10_HALF;

   227

		break;

   228

	case SPEED_10 + DUPLEX_FULL:

   229

		mac->forced_speed_duplex = ADVERTISE_10_FULL;

   230

		break;

   231

	case SPEED_100 + DUPLEX_HALF:

   232

		mac->forced_speed_duplex = ADVERTISE_100_HALF;

   233

		break;

   234

	case SPEED_100 + DUPLEX_FULL:

   235

		mac->forced_speed_duplex = ADVERTISE_100_FULL;

   236

		break;

   237

	case SPEED_1000 + DUPLEX_FULL:

   238

		mac->autoneg = 1;

   239

		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;

   240

		break;

   241

	case SPEED_1000 + DUPLEX_HALF: /* not supported */

   242

	default:

   243

		e_err("Unsupported Speed/Duplex configuration\n");

   244

		return -EINVAL;

   245

	}

   246

	return 0;

   247

}

   248

   249

static int e1000_set_settings(struct net_device *netdev,

   250

			      struct ethtool_cmd *ecmd)

   251

{

   252

	struct e1000_adapter *adapter = netdev_priv(netdev);

   253

	struct e1000_hw *hw = &adapter->hw;

   254

   255

	/*

   256

	 * When SoL/IDER sessions are active, autoneg/speed/duplex

   257

	 * cannot be changed

   258

	 */

   259

	if (e1000_check_reset_block(hw)) {

   260

		e_err("Cannot change link characteristics when SoL/IDER is "

   261

		      "active.\n");

   262

		return -EINVAL;

   263

	}

   264

   265

	while (test_and_set_bit(__E1000_RESETTING, &adapter->state))

   266

		msleep(1);

   267

   268

	if (ecmd->autoneg == AUTONEG_ENABLE) {

   269

		hw->mac.autoneg = 1;

   270

		if (hw->phy.media_type == e1000_media_type_fiber)

   271

			hw->phy.autoneg_advertised = ADVERTISED_1000baseT_Full |

   272

						     ADVERTISED_FIBRE |

   273

						     ADVERTISED_Autoneg;

   274

		else

   275

			hw->phy.autoneg_advertised = ecmd->advertising |

   276

						     ADVERTISED_TP |

   277

						     ADVERTISED_Autoneg;

   278

		ecmd->advertising = hw->phy.autoneg_advertised;

   279

		if (adapter->fc_autoneg)

   280

			hw->fc.requested_mode = e1000_fc_default;

   281

	} else {

   282

		if (e1000_set_spd_dplx(adapter, ecmd->speed + ecmd->duplex)) {

   283

			clear_bit(__E1000_RESETTING, &adapter->state);

   284

			return -EINVAL;

   285

		}

   286

	}

   287

   288

	/* reset the link */

   289

   290

	if (netif_running(adapter->netdev)) {

   291

		e1000e_down(adapter);

   292

		e1000e_up(adapter);

   293

	} else {

   294

		e1000e_reset(adapter);

   295

	}

   296

   297

	clear_bit(__E1000_RESETTING, &adapter->state);

   298

	return 0;

   299

}

   300

   301

static void e1000_get_pauseparam(struct net_device *netdev,

   302

				 struct ethtool_pauseparam *pause)

   303

{

   304

	struct e1000_adapter *adapter = netdev_priv(netdev);

   305

	struct e1000_hw *hw = &adapter->hw;

   306

   307

	pause->autoneg =

   308

		(adapter->fc_autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE);

   309

   310

	if (hw->fc.current_mode == e1000_fc_rx_pause) {

   311

		pause->rx_pause = 1;

   312

	} else if (hw->fc.current_mode == e1000_fc_tx_pause) {

   313

		pause->tx_pause = 1;

   314

	} else if (hw->fc.current_mode == e1000_fc_full) {

   315

		pause->rx_pause = 1;

   316

		pause->tx_pause = 1;

   317

	}

   318

}

   319

   320

static int e1000_set_pauseparam(struct net_device *netdev,

   321

				struct ethtool_pauseparam *pause)

   322

{

   323

	struct e1000_adapter *adapter = netdev_priv(netdev);

   324

	struct e1000_hw *hw = &adapter->hw;

   325

	int retval = 0;

   326

   327

	adapter->fc_autoneg = pause->autoneg;

   328

   329

	while (test_and_set_bit(__E1000_RESETTING, &adapter->state))

   330

		msleep(1);

   331

   332

	if (adapter->fc_autoneg == AUTONEG_ENABLE) {

   333

		hw->fc.requested_mode = e1000_fc_default;

   334

		if (netif_running(adapter->netdev)) {

   335

			e1000e_down(adapter);

   336

			e1000e_up(adapter);

   337

		} else {

   338

			e1000e_reset(adapter);

   339

		}

   340

	} else {

   341

		if (pause->rx_pause && pause->tx_pause)

   342

			hw->fc.requested_mode = e1000_fc_full;

   343

		else if (pause->rx_pause && !pause->tx_pause)

   344

			hw->fc.requested_mode = e1000_fc_rx_pause;

   345

		else if (!pause->rx_pause && pause->tx_pause)

   346

			hw->fc.requested_mode = e1000_fc_tx_pause;

   347

		else if (!pause->rx_pause && !pause->tx_pause)

   348

			hw->fc.requested_mode = e1000_fc_none;

   349

   350

		hw->fc.current_mode = hw->fc.requested_mode;

   351

   352

		if (hw->phy.media_type == e1000_media_type_fiber) {

   353

			retval = hw->mac.ops.setup_link(hw);

   354

			/* implicit goto out */

   355

		} else {

   356

			retval = e1000e_force_mac_fc(hw);

   357

			if (retval)

   358

				goto out;

   359

			e1000e_set_fc_watermarks(hw);

   360

		}

   361

	}

   362

   363

out:

   364

	clear_bit(__E1000_RESETTING, &adapter->state);

   365

	return retval;

   366

}

   367

   368

static u32 e1000_get_rx_csum(struct net_device *netdev)

   369

{

   370

	struct e1000_adapter *adapter = netdev_priv(netdev);

   371

	return adapter->flags & FLAG_RX_CSUM_ENABLED;

   372

}

   373

   374

static int e1000_set_rx_csum(struct net_device *netdev, u32 data)

   375

{

   376

	struct e1000_adapter *adapter = netdev_priv(netdev);

   377

   378

	if (data)

   379

		adapter->flags |= FLAG_RX_CSUM_ENABLED;

   380

	else

   381

		adapter->flags &= ~FLAG_RX_CSUM_ENABLED;

   382

   383

	if (netif_running(netdev))

   384

		e1000e_reinit_locked(adapter);

   385

	else

   386

		e1000e_reset(adapter);

   387

	return 0;

   388

}

   389

   390

static u32 e1000_get_tx_csum(struct net_device *netdev)

   391

{

   392

	return (netdev->features & NETIF_F_HW_CSUM) != 0;

   393

}

   394

   395

static int e1000_set_tx_csum(struct net_device *netdev, u32 data)

   396

{

   397

	if (data)

   398

		netdev->features |= NETIF_F_HW_CSUM;

   399

	else

   400

		netdev->features &= ~NETIF_F_HW_CSUM;

   401

   402

	return 0;

   403

}

   404

   405

static int e1000_set_tso(struct net_device *netdev, u32 data)

   406

{

   407

	struct e1000_adapter *adapter = netdev_priv(netdev);

   408

   409

	if (data) {

   410

		netdev->features |= NETIF_F_TSO;

   411

		netdev->features |= NETIF_F_TSO6;

   412

	} else {

   413

		netdev->features &= ~NETIF_F_TSO;

   414

		netdev->features &= ~NETIF_F_TSO6;

   415

	}

   416

   417

	adapter->flags |= FLAG_TSO_FORCE;

   418

	return 0;

   419

}

   420

   421

static u32 e1000_get_msglevel(struct net_device *netdev)

   422

{

   423

	struct e1000_adapter *adapter = netdev_priv(netdev);

   424

	return adapter->msg_enable;

   425

}

   426

   427

static void e1000_set_msglevel(struct net_device *netdev, u32 data)

   428

{

   429

	struct e1000_adapter *adapter = netdev_priv(netdev);

   430

	adapter->msg_enable = data;

   431

}

   432

   433

static int e1000_get_regs_len(struct net_device *netdev)

   434

{

   435

#define E1000_REGS_LEN 32 /* overestimate */

   436

	return E1000_REGS_LEN * sizeof(u32);

   437

}

   438

   439

static void e1000_get_regs(struct net_device *netdev,

   440

			   struct ethtool_regs *regs, void *p)

   441

{

   442

	struct e1000_adapter *adapter = netdev_priv(netdev);

   443

	struct e1000_hw *hw = &adapter->hw;

   444

	u32 *regs_buff = p;

   445

	u16 phy_data;

   446

	u8 revision_id;

   447

   448

	memset(p, 0, E1000_REGS_LEN * sizeof(u32));

   449

   450

	pci_read_config_byte(adapter->pdev, PCI_REVISION_ID, &revision_id);

   451

   452

	regs->version = (1 << 24) | (revision_id << 16) | adapter->pdev->device;

   453

   454

	regs_buff[0]  = er32(CTRL);

   455

	regs_buff[1]  = er32(STATUS);

   456

   457

	regs_buff[2]  = er32(RCTL);

   458

	regs_buff[3]  = er32(RDLEN);

   459

	regs_buff[4]  = er32(RDH);

   460

	regs_buff[5]  = er32(RDT);

   461

	regs_buff[6]  = er32(RDTR);

   462

   463

	regs_buff[7]  = er32(TCTL);

   464

	regs_buff[8]  = er32(TDLEN);

   465

	regs_buff[9]  = er32(TDH);

   466

	regs_buff[10] = er32(TDT);

   467

	regs_buff[11] = er32(TIDV);

   468

   469

	regs_buff[12] = adapter->hw.phy.type;  /* PHY type (IGP=1, M88=0) */

   470

   471

	/* ethtool doesn't use anything past this point, so all this

   472

	 * code is likely legacy junk for apps that may or may not

   473

	 * exist */

   474

	if (hw->phy.type == e1000_phy_m88) {

   475

		e1e_rphy(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);

   476

		regs_buff[13] = (u32)phy_data; /* cable length */

   477

		regs_buff[14] = 0;  /* Dummy (to align w/ IGP phy reg dump) */

   478

		regs_buff[15] = 0;  /* Dummy (to align w/ IGP phy reg dump) */

   479

		regs_buff[16] = 0;  /* Dummy (to align w/ IGP phy reg dump) */

   480

		e1e_rphy(hw, M88E1000_PHY_SPEC_CTRL, &phy_data);

   481

		regs_buff[17] = (u32)phy_data; /* extended 10bt distance */

   482

		regs_buff[18] = regs_buff[13]; /* cable polarity */

   483

		regs_buff[19] = 0;  /* Dummy (to align w/ IGP phy reg dump) */

   484

		regs_buff[20] = regs_buff[17]; /* polarity correction */

   485

		/* phy receive errors */

   486

		regs_buff[22] = adapter->phy_stats.receive_errors;

   487

		regs_buff[23] = regs_buff[13]; /* mdix mode */

   488

	}

   489

	regs_buff[21] = 0; /* was idle_errors */

   490

	e1e_rphy(hw, PHY_1000T_STATUS, &phy_data);

   491

	regs_buff[24] = (u32)phy_data;  /* phy local receiver status */

   492

	regs_buff[25] = regs_buff[24];  /* phy remote receiver status */

   493

}

   494

   495

static int e1000_get_eeprom_len(struct net_device *netdev)

   496

{

   497

	struct e1000_adapter *adapter = netdev_priv(netdev);

   498

	return adapter->hw.nvm.word_size * 2;

   499

}

   500

   501

static int e1000_get_eeprom(struct net_device *netdev,

   502

			    struct ethtool_eeprom *eeprom, u8 *bytes)

   503

{

   504

	struct e1000_adapter *adapter = netdev_priv(netdev);

   505

	struct e1000_hw *hw = &adapter->hw;

   506

	u16 *eeprom_buff;

   507

	int first_word;

   508

	int last_word;

   509

	int ret_val = 0;

   510

	u16 i;

   511

   512

	if (eeprom->len == 0)

   513

		return -EINVAL;

   514

   515

	eeprom->magic = adapter->pdev->vendor | (adapter->pdev->device << 16);

   516

   517

	first_word = eeprom->offset >> 1;

   518

	last_word = (eeprom->offset + eeprom->len - 1) >> 1;

   519

   520

	eeprom_buff = kmalloc(sizeof(u16) *

   521

			(last_word - first_word + 1), GFP_KERNEL);

   522

	if (!eeprom_buff)

   523

		return -ENOMEM;

   524

   525

	if (hw->nvm.type == e1000_nvm_eeprom_spi) {

   526

		ret_val = e1000_read_nvm(hw, first_word,

   527

					 last_word - first_word + 1,

   528

					 eeprom_buff);

   529

	} else {

   530

		for (i = 0; i < last_word - first_word + 1; i++) {