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

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2009 Intel Corporation.

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

     7

  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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    10

  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

    12

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

    13

  more details.

    14

    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.

    18

    19

  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>

    25

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

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    27

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

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    29

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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    31

#include <linux/module.h>

    32

#include <linux/types.h>

    33

#include <linux/init.h>

    34

#include <linux/pci.h>

    35

#include <linux/vmalloc.h>

    36

#include <linux/pagemap.h>

    37

#include <linux/delay.h>

    38

#include <linux/netdevice.h>

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#include <linux/tcp.h>

    40

#include <linux/ipv6.h>

    41

#include <linux/slab.h>

    42

#include <net/checksum.h>

    43

#include <net/ip6_checksum.h>

    44

#include <linux/mii.h>

    45

#include <linux/ethtool.h>

    46

#include <linux/if_vlan.h>

    47

#include <linux/cpu.h>

    48

#include <linux/smp.h>

    49

#include <linux/pm_qos_params.h>

    50

#include <linux/pm_runtime.h>

    51

#include <linux/aer.h>

    52

    53

#include "e1000.h"

    54

    55

#define DRV_VERSION "1.0.2-k4"

    56

char e1000e_driver_name[] = "e1000e";

    57

const char e1000e_driver_version[] = DRV_VERSION;

    58

    59

static const struct e1000_info *e1000_info_tbl[] = {

    60

	[board_82571]		= &e1000_82571_info,

    61

	[board_82572]		= &e1000_82572_info,

    62

	[board_82573]		= &e1000_82573_info,

    63

	[board_82574]		= &e1000_82574_info,

    64

	[board_82583]		= &e1000_82583_info,

    65

	[board_80003es2lan]	= &e1000_es2_info,

    66

	[board_ich8lan]		= &e1000_ich8_info,

    67

	[board_ich9lan]		= &e1000_ich9_info,

    68

	[board_ich10lan]	= &e1000_ich10_info,

    69

	[board_pchlan]		= &e1000_pch_info,

    70

};

    71

    72

struct e1000_reg_info {

    73

	u32 ofs;

    74

	char *name;

    75

};

    76

    77

#define E1000_RDFH	0x02410 /* Rx Data FIFO Head - RW */

    78

#define E1000_RDFT	0x02418 /* Rx Data FIFO Tail - RW */

    79

#define E1000_RDFHS	0x02420 /* Rx Data FIFO Head Saved - RW */

    80

#define E1000_RDFTS	0x02428 /* Rx Data FIFO Tail Saved - RW */

    81

#define E1000_RDFPC	0x02430 /* Rx Data FIFO Packet Count - RW */

    82

    83

#define E1000_TDFH	0x03410 /* Tx Data FIFO Head - RW */

    84

#define E1000_TDFT	0x03418 /* Tx Data FIFO Tail - RW */

    85

#define E1000_TDFHS	0x03420 /* Tx Data FIFO Head Saved - RW */

    86

#define E1000_TDFTS	0x03428 /* Tx Data FIFO Tail Saved - RW */

    87

#define E1000_TDFPC	0x03430 /* Tx Data FIFO Packet Count - RW */

    88

    89

static const struct e1000_reg_info e1000_reg_info_tbl[] = {

    90

    91

	/* General Registers */

    92

	{E1000_CTRL, "CTRL"},

    93

	{E1000_STATUS, "STATUS"},

    94

	{E1000_CTRL_EXT, "CTRL_EXT"},

    95

    96

	/* Interrupt Registers */

    97

	{E1000_ICR, "ICR"},

    98

    99

	/* RX Registers */

   100

	{E1000_RCTL, "RCTL"},

   101

	{E1000_RDLEN, "RDLEN"},

   102

	{E1000_RDH, "RDH"},

   103

	{E1000_RDT, "RDT"},

   104

	{E1000_RDTR, "RDTR"},

   105

	{E1000_RXDCTL(0), "RXDCTL"},

   106

	{E1000_ERT, "ERT"},

   107

	{E1000_RDBAL, "RDBAL"},

   108

	{E1000_RDBAH, "RDBAH"},

   109

	{E1000_RDFH, "RDFH"},

   110

	{E1000_RDFT, "RDFT"},

   111

	{E1000_RDFHS, "RDFHS"},

   112

	{E1000_RDFTS, "RDFTS"},

   113

	{E1000_RDFPC, "RDFPC"},

   114

   115

	/* TX Registers */

   116

	{E1000_TCTL, "TCTL"},

   117

	{E1000_TDBAL, "TDBAL"},

   118

	{E1000_TDBAH, "TDBAH"},

   119

	{E1000_TDLEN, "TDLEN"},

   120

	{E1000_TDH, "TDH"},

   121

	{E1000_TDT, "TDT"},

   122

	{E1000_TIDV, "TIDV"},

   123

	{E1000_TXDCTL(0), "TXDCTL"},

   124

	{E1000_TADV, "TADV"},

   125

	{E1000_TARC(0), "TARC"},

   126

	{E1000_TDFH, "TDFH"},

   127

	{E1000_TDFT, "TDFT"},

   128

	{E1000_TDFHS, "TDFHS"},

   129

	{E1000_TDFTS, "TDFTS"},

   130

	{E1000_TDFPC, "TDFPC"},

   131

   132

	/* List Terminator */

   133

	{}

   134

};

   135

   136

/*

   137

 * e1000_regdump - register printout routine

   138

 */

   139

static void e1000_regdump(struct e1000_hw *hw, struct e1000_reg_info *reginfo)

   140

{

   141

	int n = 0;

   142

	char rname[16];

   143

	u32 regs[8];

   144

   145

	switch (reginfo->ofs) {

   146

	case E1000_RXDCTL(0):

   147

		for (n = 0; n < 2; n++)

   148

			regs[n] = __er32(hw, E1000_RXDCTL(n));

   149

		break;

   150

	case E1000_TXDCTL(0):

   151

		for (n = 0; n < 2; n++)

   152

			regs[n] = __er32(hw, E1000_TXDCTL(n));

   153

		break;

   154

	case E1000_TARC(0):

   155

		for (n = 0; n < 2; n++)

   156

			regs[n] = __er32(hw, E1000_TARC(n));

   157

		break;

   158

	default:

   159

		printk(KERN_INFO "%-15s %08x\n",

   160

			reginfo->name, __er32(hw, reginfo->ofs));

   161

		return;

   162

	}

   163

   164

	snprintf(rname, 16, "%s%s", reginfo->name, "[0-1]");

   165

	printk(KERN_INFO "%-15s ", rname);

   166

	for (n = 0; n < 2; n++)

   167

		printk(KERN_CONT "%08x ", regs[n]);

   168

	printk(KERN_CONT "\n");

   169

}

   170

   171

   172

/*

   173

 * e1000e_dump - Print registers, tx-ring and rx-ring

   174

 */

   175

static void e1000e_dump(struct e1000_adapter *adapter)

   176

{

   177

	struct net_device *netdev = adapter->netdev;

   178

	struct e1000_hw *hw = &adapter->hw;

   179

	struct e1000_reg_info *reginfo;

   180

	struct e1000_ring *tx_ring = adapter->tx_ring;

   181

	struct e1000_tx_desc *tx_desc;

   182

	struct my_u0 { u64 a; u64 b; } *u0;

   183

	struct e1000_buffer *buffer_info;

   184

	struct e1000_ring *rx_ring = adapter->rx_ring;

   185

	union e1000_rx_desc_packet_split *rx_desc_ps;

   186

	struct e1000_rx_desc *rx_desc;

   187

	struct my_u1 { u64 a; u64 b; u64 c; u64 d; } *u1;

   188

	u32 staterr;

   189

	int i = 0;

   190

   191

	if (!netif_msg_hw(adapter))

   192

		return;

   193

   194

	/* Print netdevice Info */

   195

	if (netdev) {

   196

		dev_info(&adapter->pdev->dev, "Net device Info\n");

   197

		printk(KERN_INFO "Device Name     state            "

   198

			"trans_start      last_rx\n");

   199

		printk(KERN_INFO "%-15s %016lX %016lX %016lX\n",

   200

			netdev->name,

   201

			netdev->state,

   202

			netdev->trans_start,

   203

			netdev->last_rx);

   204

	}

   205

   206

	/* Print Registers */

   207

	dev_info(&adapter->pdev->dev, "Register Dump\n");

   208

	printk(KERN_INFO " Register Name   Value\n");

   209

	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;

   210

	     reginfo->name; reginfo++) {

   211

		e1000_regdump(hw, reginfo);

   212

	}

   213

   214

	/* Print TX Ring Summary */

   215

	if (!netdev || !netif_running(netdev))

   216

		goto exit;

   217

   218

	dev_info(&adapter->pdev->dev, "TX Rings Summary\n");

   219

	printk(KERN_INFO "Queue [NTU] [NTC] [bi(ntc)->dma  ]"

   220

		" leng ntw timestamp\n");

   221

	buffer_info = &tx_ring->buffer_info[tx_ring->next_to_clean];

   222

	printk(KERN_INFO " %5d %5X %5X %016llX %04X %3X %016llX\n",

   223

		0, tx_ring->next_to_use, tx_ring->next_to_clean,

   224

		(u64)buffer_info->dma,

   225

		buffer_info->length,

   226

		buffer_info->next_to_watch,

   227

		(u64)buffer_info->time_stamp);

   228

   229

	/* Print TX Rings */

   230

	if (!netif_msg_tx_done(adapter))

   231

		goto rx_ring_summary;

   232

   233

	dev_info(&adapter->pdev->dev, "TX Rings Dump\n");

   234

   235

	/* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)

   236

	 *

   237

	 * Legacy Transmit Descriptor

   238

	 *   +--------------------------------------------------------------+

   239

	 * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |

   240

	 *   +--------------------------------------------------------------+

   241

	 * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |

   242

	 *   +--------------------------------------------------------------+

   243

	 *   63       48 47        36 35    32 31     24 23    16 15        0

   244

	 *

   245

	 * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload

   246

	 *   63      48 47    40 39       32 31             16 15    8 7      0

   247

	 *   +----------------------------------------------------------------+

   248

	 * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |

   249

	 *   +----------------------------------------------------------------+

   250

	 * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |

   251

	 *   +----------------------------------------------------------------+

   252

	 *   63      48 47    40 39 36 35 32 31   24 23  20 19                0

   253

	 *

   254

	 * Extended Data Descriptor (DTYP=0x1)

   255

	 *   +----------------------------------------------------------------+

   256

	 * 0 |                     Buffer Address [63:0]                      |

   257

	 *   +----------------------------------------------------------------+

   258

	 * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |

   259

	 *   +----------------------------------------------------------------+

   260

	 *   63       48 47     40 39  36 35    32 31     24 23  20 19        0

   261

	 */

   262

	printk(KERN_INFO "Tl[desc]     [address 63:0  ] [SpeCssSCmCsLen]"

   263

		" [bi->dma       ] leng  ntw timestamp        bi->skb "

   264

		"<-- Legacy format\n");

   265

	printk(KERN_INFO "Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen]"

   266

		" [bi->dma       ] leng  ntw timestamp        bi->skb "

   267

		"<-- Ext Context format\n");

   268

	printk(KERN_INFO "Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen]"

   269

		" [bi->dma       ] leng  ntw timestamp        bi->skb "

   270

		"<-- Ext Data format\n");

   271

	for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {

   272

		tx_desc = E1000_TX_DESC(*tx_ring, i);

   273

		buffer_info = &tx_ring->buffer_info[i];

   274

		u0 = (struct my_u0 *)tx_desc;

   275

		printk(KERN_INFO "T%c[0x%03X]    %016llX %016llX %016llX "

   276

			"%04X  %3X %016llX %p",

   277

		       (!(le64_to_cpu(u0->b) & (1<<29)) ? 'l' :

   278

			((le64_to_cpu(u0->b) & (1<<20)) ? 'd' : 'c')), i,

   279

		       le64_to_cpu(u0->a), le64_to_cpu(u0->b),

   280

		       (u64)buffer_info->dma, buffer_info->length,

   281

		       buffer_info->next_to_watch, (u64)buffer_info->time_stamp,

   282

		       buffer_info->skb);

   283

		if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)

   284

			printk(KERN_CONT " NTC/U\n");

   285

		else if (i == tx_ring->next_to_use)

   286

			printk(KERN_CONT " NTU\n");

   287

		else if (i == tx_ring->next_to_clean)

   288

			printk(KERN_CONT " NTC\n");

   289

		else

   290

			printk(KERN_CONT "\n");

   291

   292

		if (netif_msg_pktdata(adapter) && buffer_info->dma != 0)

   293

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   294

					16, 1, phys_to_virt(buffer_info->dma),

   295

					buffer_info->length, true);

   296

	}

   297

   298

	/* Print RX Rings Summary */

   299

rx_ring_summary:

   300

	dev_info(&adapter->pdev->dev, "RX Rings Summary\n");

   301

	printk(KERN_INFO "Queue [NTU] [NTC]\n");

   302

	printk(KERN_INFO " %5d %5X %5X\n", 0,

   303

		rx_ring->next_to_use, rx_ring->next_to_clean);

   304

   305

	/* Print RX Rings */

   306

	if (!netif_msg_rx_status(adapter))

   307

		goto exit;

   308

   309

	dev_info(&adapter->pdev->dev, "RX Rings Dump\n");

   310

	switch (adapter->rx_ps_pages) {

   311

	case 1:

   312

	case 2:

   313

	case 3:

   314

		/* [Extended] Packet Split Receive Descriptor Format

   315

		 *

   316

		 *    +-----------------------------------------------------+

   317

		 *  0 |                Buffer Address 0 [63:0]              |

   318

		 *    +-----------------------------------------------------+

   319

		 *  8 |                Buffer Address 1 [63:0]              |

   320

		 *    +-----------------------------------------------------+

   321

		 * 16 |                Buffer Address 2 [63:0]              |

   322

		 *    +-----------------------------------------------------+

   323

		 * 24 |                Buffer Address 3 [63:0]              |

   324

		 *    +-----------------------------------------------------+

   325

		 */

   326

		printk(KERN_INFO "R  [desc]      [buffer 0 63:0 ] "

   327

			"[buffer 1 63:0 ] "

   328

		       "[buffer 2 63:0 ] [buffer 3 63:0 ] [bi->dma       ] "

   329

		       "[bi->skb] <-- Ext Pkt Split format\n");

   330

		/* [Extended] Receive Descriptor (Write-Back) Format

   331

		 *

   332

		 *   63       48 47    32 31     13 12    8 7    4 3        0

   333

		 *   +------------------------------------------------------+

   334

		 * 0 | Packet   | IP     |  Rsvd   | MRQ   | Rsvd | MRQ RSS |

   335

		 *   | Checksum | Ident  |         | Queue |      |  Type   |

   336

		 *   +------------------------------------------------------+

   337

		 * 8 | VLAN Tag | Length | Extended Error | Extended Status |

   338

		 *   +------------------------------------------------------+

   339

		 *   63       48 47    32 31            20 19               0

   340

		 */

   341

		printk(KERN_INFO "RWB[desc]      [ck ipid mrqhsh] "

   342

			"[vl   l0 ee  es] "

   343

		       "[ l3  l2  l1 hs] [reserved      ] ---------------- "

   344

		       "[bi->skb] <-- Ext Rx Write-Back format\n");

   345

		for (i = 0; i < rx_ring->count; i++) {

   346

			buffer_info = &rx_ring->buffer_info[i];

   347

			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);

   348

			u1 = (struct my_u1 *)rx_desc_ps;

   349

			staterr =

   350

				le32_to_cpu(rx_desc_ps->wb.middle.status_error);

   351

			if (staterr & E1000_RXD_STAT_DD) {

   352

				/* Descriptor Done */

   353

				printk(KERN_INFO "RWB[0x%03X]     %016llX "

   354

					"%016llX %016llX %016llX "

   355

					"---------------- %p", i,

   356

					le64_to_cpu(u1->a),

   357

					le64_to_cpu(u1->b),

   358

					le64_to_cpu(u1->c),

   359

					le64_to_cpu(u1->d),

   360

					buffer_info->skb);

   361

			} else {

   362

				printk(KERN_INFO "R  [0x%03X]     %016llX "

   363

					"%016llX %016llX %016llX %016llX %p", i,

   364

					le64_to_cpu(u1->a),

   365

					le64_to_cpu(u1->b),

   366

					le64_to_cpu(u1->c),

   367

					le64_to_cpu(u1->d),

   368

					(u64)buffer_info->dma,

   369

					buffer_info->skb);

   370

   371

				if (netif_msg_pktdata(adapter))

   372

					print_hex_dump(KERN_INFO, "",

   373

						DUMP_PREFIX_ADDRESS, 16, 1,

   374

						phys_to_virt(buffer_info->dma),

   375

						adapter->rx_ps_bsize0, true);

   376

			}

   377

   378

			if (i == rx_ring->next_to_use)

   379

				printk(KERN_CONT " NTU\n");

   380

			else if (i == rx_ring->next_to_clean)

   381

				printk(KERN_CONT " NTC\n");

   382

			else

   383

				printk(KERN_CONT "\n");

   384

		}

   385

		break;

   386

	default:

   387

	case 0:

   388

		/* Legacy Receive Descriptor Format

   389

		 *

   390

		 * +-----------------------------------------------------+

   391

		 * |                Buffer Address [63:0]                |

   392

		 * +-----------------------------------------------------+

   393

		 * | VLAN Tag | Errors | Status 0 | Packet csum | Length |

   394

		 * +-----------------------------------------------------+

   395

		 * 63       48 47    40 39      32 31         16 15      0

   396

		 */

   397

		printk(KERN_INFO "Rl[desc]     [address 63:0  ] "

   398

			"[vl er S cks ln] [bi->dma       ] [bi->skb] "

   399

			"<-- Legacy format\n");

   400

		for (i = 0; rx_ring->desc && (i < rx_ring->count); i++) {

   401

			rx_desc = E1000_RX_DESC(*rx_ring, i);

   402

			buffer_info = &rx_ring->buffer_info[i];

   403

			u0 = (struct my_u0 *)rx_desc;

   404

			printk(KERN_INFO "Rl[0x%03X]    %016llX %016llX "

   405

				"%016llX %p",

   406

				i, le64_to_cpu(u0->a), le64_to_cpu(u0->b),

   407

				(u64)buffer_info->dma, buffer_info->skb);

   408

			if (i == rx_ring->next_to_use)

   409

				printk(KERN_CONT " NTU\n");

   410

			else if (i == rx_ring->next_to_clean)

   411

				printk(KERN_CONT " NTC\n");

   412

			else

   413

				printk(KERN_CONT "\n");

   414

   415

			if (netif_msg_pktdata(adapter))

   416

				print_hex_dump(KERN_INFO, "",

   417

					DUMP_PREFIX_ADDRESS,

   418

					16, 1, phys_to_virt(buffer_info->dma),

   419

					adapter->rx_buffer_len, true);

   420

		}

   421

	}

   422

   423

exit:

   424

	return;

   425

}

   426

   427

/**

   428

 * e1000_desc_unused - calculate if we have unused descriptors

   429

 **/

   430

static int e1000_desc_unused(struct e1000_ring *ring)

   431

{

   432

	if (ring->next_to_clean > ring->next_to_use)

   433

		return ring->next_to_clean - ring->next_to_use - 1;

   434

   435

	return ring->count + ring->next_to_clean - ring->next_to_use - 1;

   436

}

   437

   438

/**

   439

 * e1000_receive_skb - helper function to handle Rx indications

   440

 * @adapter: board private structure

   441

 * @status: descriptor status field as written by hardware

   442

 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)

   443

 * @skb: pointer to sk_buff to be indicated to stack

   444

 **/

   445

static void e1000_receive_skb(struct e1000_adapter *adapter,

   446

			      struct net_device *netdev,

   447

			      struct sk_buff *skb,

   448

			      u8 status, __le16 vlan)

   449

{

   450

	skb->protocol = eth_type_trans(skb, netdev);

   451

   452

	if (adapter->vlgrp && (status & E1000_RXD_STAT_VP))

   453

		vlan_gro_receive(&adapter->napi, adapter->vlgrp,

   454

				 le16_to_cpu(vlan), skb);

   455

	else

   456

		napi_gro_receive(&adapter->napi, skb);

   457

}

   458

   459

/**

   460

 * e1000_rx_checksum - Receive Checksum Offload for 82543

   461

 * @adapter:     board private structure

   462

 * @status_err:  receive descriptor status and error fields

   463

 * @csum:	receive descriptor csum field

   464

 * @sk_buff:     socket buffer with received data

   465

 **/

   466

static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,

   467

			      u32 csum, struct sk_buff *skb)

   468

{

   469

	u16 status = (u16)status_err;

   470

	u8 errors = (u8)(status_err >> 24);

   471

	skb->ip_summed = CHECKSUM_NONE;

   472

   473

	/* Ignore Checksum bit is set */

   474

	if (status & E1000_RXD_STAT_IXSM)

   475

		return;

   476

	/* TCP/UDP checksum error bit is set */

   477

	if (errors & E1000_RXD_ERR_TCPE) {

   478

		/* let the stack verify checksum errors */

   479

		adapter->hw_csum_err++;

   480

		return;

   481

	}

   482

   483

	/* TCP/UDP Checksum has not been calculated */

   484

	if (!(status & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS)))

   485

		return;

   486

   487

	/* It must be a TCP or UDP packet with a valid checksum */

   488

	if (status & E1000_RXD_STAT_TCPCS) {

   489

		/* TCP checksum is good */

   490

		skb->ip_summed = CHECKSUM_UNNECESSARY;

   491

	} else {

   492

		/*

   493

		 * IP fragment with UDP payload

   494

		 * Hardware complements the payload checksum, so we undo it

   495

		 * and then put the value in host order for further stack use.

   496

		 */

   497

		__sum16 sum = (__force __sum16)htons(csum);

   498

		skb->csum = csum_unfold(~sum);

   499

		skb->ip_summed = CHECKSUM_COMPLETE;

   500

	}

   501

	adapter->hw_csum_good++;

   502

}

   503

   504

/**

   505

 * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended

   506

 * @adapter: address of board private structure

   507

 **/

   508

static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,

   509

				   int cleaned_count)

   510

{

   511

	struct net_device *netdev = adapter->netdev;

   512

	struct pci_dev *pdev = adapter->pdev;

   513

	struct e1000_ring *rx_ring = adapter->rx_ring;

   514

	struct e1000_rx_desc *rx_desc;

   515

	struct e1000_buffer *buffer_info;

   516

	struct sk_buff *skb;

   517

	unsigned int i;

   518

	unsigned int bufsz = adapter->rx_buffer_len;

   519

   520

	i = rx_ring->next_to_use;

   521

	buffer_info = &rx_ring->buffer_info[i];

   522

   523

	while (cleaned_count--) {

   524

		skb = buffer_info->skb;

   525

		if (skb) {

   526

			skb_trim(skb, 0);

   527

			goto map_skb;

   528

		}

   529