1

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

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2012 Intel Corporation.

     5

     6

  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.

     9

    10

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

    11

  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

    16

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

    17

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

    18

    19

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

    20

  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

  vim: noexpandtab

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    29

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

    30

    31

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

    32

    33

#include <linux/module.h>

    34

#include <linux/types.h>

    35

#include <linux/init.h>

    36

#include <linux/pci.h>

    37

#include <linux/vmalloc.h>

    38

#include <linux/pagemap.h>

    39

#include <linux/delay.h>

    40

#include <linux/netdevice.h>

    41

#include <linux/interrupt.h>

    42

#include <linux/tcp.h>

    43

#include <linux/ipv6.h>

    44

#include <linux/slab.h>

    45

#include <net/checksum.h>

    46

#include <net/ip6_checksum.h>

    47

#include <linux/mii.h>

    48

#include <linux/ethtool.h>

    49

#include <linux/if_vlan.h>

    50

#include <linux/cpu.h>

    51

#include <linux/smp.h>

    52

#include <linux/pm_qos.h>

    53

#include <linux/pm_runtime.h>

    54

#include <linux/aer.h>

    55

#include <linux/prefetch.h>

    56

    57

#include "e1000-3.4-ethercat.h"

    58

    59

#define DRV_EXTRAVERSION "-k-EtherCAT"

    60

    61

#define DRV_VERSION "1.9.5" DRV_EXTRAVERSION

    62

char e1000e_driver_name[] = "ec_e1000e";

    63

const char e1000e_driver_version[] = DRV_VERSION;

    64

    65

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)

    66

static int debug = -1;

    67

module_param(debug, int, 0);

    68

MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

    69

    70

static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);

    71

    72

static const struct e1000_info *e1000_info_tbl[] = {

    73

	[board_82571]		= &e1000_82571_info,

    74

	[board_82572]		= &e1000_82572_info,

    75

	[board_82573]		= &e1000_82573_info,

    76

	[board_82574]		= &e1000_82574_info,

    77

	[board_82583]		= &e1000_82583_info,

    78

	[board_80003es2lan]	= &e1000_es2_info,

    79

	[board_ich8lan]		= &e1000_ich8_info,

    80

	[board_ich9lan]		= &e1000_ich9_info,

    81

	[board_ich10lan]	= &e1000_ich10_info,

    82

	[board_pchlan]		= &e1000_pch_info,

    83

	[board_pch2lan]		= &e1000_pch2_info,

    84

};

    85

    86

struct e1000_reg_info {

    87

	u32 ofs;

    88

	char *name;

    89

};

    90

    91

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

    92

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

    93

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

    94

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

    95

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

    96

    97

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

    98

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

    99

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

   100

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

   101

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

   102

   103

static const struct e1000_reg_info e1000_reg_info_tbl[] = {

   104

   105

	/* General Registers */

   106

	{E1000_CTRL, "CTRL"},

   107

	{E1000_STATUS, "STATUS"},

   108

	{E1000_CTRL_EXT, "CTRL_EXT"},

   109

   110

	/* Interrupt Registers */

   111

	{E1000_ICR, "ICR"},

   112

   113

	/* Rx Registers */

   114

	{E1000_RCTL, "RCTL"},

   115

	{E1000_RDLEN, "RDLEN"},

   116

	{E1000_RDH, "RDH"},

   117

	{E1000_RDT, "RDT"},

   118

	{E1000_RDTR, "RDTR"},

   119

	{E1000_RXDCTL(0), "RXDCTL"},

   120

	{E1000_ERT, "ERT"},

   121

	{E1000_RDBAL, "RDBAL"},

   122

	{E1000_RDBAH, "RDBAH"},

   123

	{E1000_RDFH, "RDFH"},

   124

	{E1000_RDFT, "RDFT"},

   125

	{E1000_RDFHS, "RDFHS"},

   126

	{E1000_RDFTS, "RDFTS"},

   127

	{E1000_RDFPC, "RDFPC"},

   128

   129

	/* Tx Registers */

   130

	{E1000_TCTL, "TCTL"},

   131

	{E1000_TDBAL, "TDBAL"},

   132

	{E1000_TDBAH, "TDBAH"},

   133

	{E1000_TDLEN, "TDLEN"},

   134

	{E1000_TDH, "TDH"},

   135

	{E1000_TDT, "TDT"},

   136

	{E1000_TIDV, "TIDV"},

   137

	{E1000_TXDCTL(0), "TXDCTL"},

   138

	{E1000_TADV, "TADV"},

   139

	{E1000_TARC(0), "TARC"},

   140

	{E1000_TDFH, "TDFH"},

   141

	{E1000_TDFT, "TDFT"},

   142

	{E1000_TDFHS, "TDFHS"},

   143

	{E1000_TDFTS, "TDFTS"},

   144

	{E1000_TDFPC, "TDFPC"},

   145

   146

	/* List Terminator */

   147

	{0, NULL}

   148

};

   149

   150

/*

   151

 * e1000_regdump - register printout routine

   152

 */

   153

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

   154

{

   155

	int n = 0;

   156

	char rname[16];

   157

	u32 regs[8];

   158

   159

	switch (reginfo->ofs) {

   160

	case E1000_RXDCTL(0):

   161

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

   162

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

   163

		break;

   164

	case E1000_TXDCTL(0):

   165

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

   166

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

   167

		break;

   168

	case E1000_TARC(0):

   169

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

   170

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

   171

		break;

   172

	default:

   173

		pr_info("%-15s %08x\n",

   174

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

   175

		return;

   176

	}

   177

   178

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

   179

	pr_info("%-15s %08x %08x\n", rname, regs[0], regs[1]);

   180

}

   181

   182

/*

   183

 * e1000e_dump - Print registers, Tx-ring and Rx-ring

   184

 */

   185

static void e1000e_dump(struct e1000_adapter *adapter)

   186

{

   187

	struct net_device *netdev = adapter->netdev;

   188

	struct e1000_hw *hw = &adapter->hw;

   189

	struct e1000_reg_info *reginfo;

   190

	struct e1000_ring *tx_ring = adapter->tx_ring;

   191

	struct e1000_tx_desc *tx_desc;

   192

	struct my_u0 {

   193

		__le64 a;

   194

		__le64 b;

   195

	} *u0;

   196

	struct e1000_buffer *buffer_info;

   197

	struct e1000_ring *rx_ring = adapter->rx_ring;

   198

	union e1000_rx_desc_packet_split *rx_desc_ps;

   199

	union e1000_rx_desc_extended *rx_desc;

   200

	struct my_u1 {

   201

		__le64 a;

   202

		__le64 b;

   203

		__le64 c;

   204

		__le64 d;

   205

	} *u1;

   206

	u32 staterr;

   207

	int i = 0;

   208

   209

	if (!netif_msg_hw(adapter))

   210

		return;

   211

   212

	/* Print netdevice Info */

   213

	if (netdev) {

   214

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

   215

		pr_info("Device Name     state            trans_start      last_rx\n");

   216

		pr_info("%-15s %016lX %016lX %016lX\n",

   217

			netdev->name, netdev->state, netdev->trans_start,

   218

			netdev->last_rx);

   219

	}

   220

   221

	/* Print Registers */

   222

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

   223

	pr_info(" Register Name   Value\n");

   224

	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;

   225

	     reginfo->name; reginfo++) {

   226

		e1000_regdump(hw, reginfo);

   227

	}

   228

   229

	/* Print Tx Ring Summary */

   230

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

   231

		return;

   232

   233

	dev_info(&adapter->pdev->dev, "Tx Ring Summary\n");

   234

	pr_info("Queue [NTU] [NTC] [bi(ntc)->dma  ] leng ntw timestamp\n");

   235

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

   236

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

   237

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

   238

		(unsigned long long)buffer_info->dma,

   239

		buffer_info->length,

   240

		buffer_info->next_to_watch,

   241

		(unsigned long long)buffer_info->time_stamp);

   242

   243

	/* Print Tx Ring */

   244

	if (!netif_msg_tx_done(adapter))

   245

		goto rx_ring_summary;

   246

   247

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

   248

   249

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

   250

	 *

   251

	 * Legacy Transmit Descriptor

   252

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

   253

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

   254

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

   255

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

   256

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

   257

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

   258

	 *

   259

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

   260

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

   261

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

   262

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

   263

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

   264

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

   265

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

   266

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

   267

	 *

   268

	 * Extended Data Descriptor (DTYP=0x1)

   269

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

   270

	 * 0 |                     Buffer Address [63:0]                      |

   271

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

   272

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

   273

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

   274

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

   275

	 */

   276

	pr_info("Tl[desc]     [address 63:0  ] [SpeCssSCmCsLen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Legacy format\n");

   277

	pr_info("Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Context format\n");

   278

	pr_info("Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Data format\n");

   279

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

   280

		const char *next_desc;

   281

		tx_desc = E1000_TX_DESC(*tx_ring, i);

   282

		buffer_info = &tx_ring->buffer_info[i];

   283

		u0 = (struct my_u0 *)tx_desc;

   284

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

   285

			next_desc = " NTC/U";

   286

		else if (i == tx_ring->next_to_use)

   287

			next_desc = " NTU";

   288

		else if (i == tx_ring->next_to_clean)

   289

			next_desc = " NTC";

   290

		else

   291

			next_desc = "";

   292

		pr_info("T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X %016llX %p%s\n",

   293

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

   294

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

   295

			i,

   296

			(unsigned long long)le64_to_cpu(u0->a),

   297

			(unsigned long long)le64_to_cpu(u0->b),

   298

			(unsigned long long)buffer_info->dma,

   299

			buffer_info->length, buffer_info->next_to_watch,

   300

			(unsigned long long)buffer_info->time_stamp,

   301

			buffer_info->skb, next_desc);

   302

   303

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

   304

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   305

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

   306

				       buffer_info->length, true);

   307

	}

   308

   309

	/* Print Rx Ring Summary */

   310

rx_ring_summary:

   311

	dev_info(&adapter->pdev->dev, "Rx Ring Summary\n");

   312

	pr_info("Queue [NTU] [NTC]\n");

   313

	pr_info(" %5d %5X %5X\n",

   314

		0, rx_ring->next_to_use, rx_ring->next_to_clean);

   315

   316

	/* Print Rx Ring */

   317

	if (!netif_msg_rx_status(adapter))

   318

		return;

   319

   320

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

   321

	switch (adapter->rx_ps_pages) {

   322

	case 1:

   323

	case 2:

   324

	case 3:

   325

		/* [Extended] Packet Split Receive Descriptor Format

   326

		 *

   327

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

   328

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

   329

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

   330

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

   331

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

   332

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

   333

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

   334

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

   335

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

   336

		 */

   337

		pr_info("R  [desc]      [buffer 0 63:0 ] [buffer 1 63:0 ] [buffer 2 63:0 ] [buffer 3 63:0 ] [bi->dma       ] [bi->skb] <-- Ext Pkt Split format\n");

   338

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

   339

		 *

   340

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

   341

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

   342

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

   343

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

   344

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

   345

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

   346

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

   347

		 *   63       48 47    32 31            20 19               0

   348

		 */

   349

		pr_info("RWB[desc]      [ck ipid mrqhsh] [vl   l0 ee  es] [ l3  l2  l1 hs] [reserved      ] ---------------- [bi->skb] <-- Ext Rx Write-Back format\n");

   350

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

   351

			const char *next_desc;

   352

			buffer_info = &rx_ring->buffer_info[i];

   353

			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);

   354

			u1 = (struct my_u1 *)rx_desc_ps;

   355

			staterr =

   356

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

   357

   358

			if (i == rx_ring->next_to_use)

   359

				next_desc = " NTU";

   360

			else if (i == rx_ring->next_to_clean)

   361

				next_desc = " NTC";

   362

			else

   363

				next_desc = "";

   364

   365

			if (staterr & E1000_RXD_STAT_DD) {

   366

				/* Descriptor Done */

   367

				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX ---------------- %p%s\n",

   368

					"RWB", i,

   369

					(unsigned long long)le64_to_cpu(u1->a),

   370

					(unsigned long long)le64_to_cpu(u1->b),

   371

					(unsigned long long)le64_to_cpu(u1->c),

   372

					(unsigned long long)le64_to_cpu(u1->d),

   373

					buffer_info->skb, next_desc);

   374

			} else {

   375

				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX %016llX %p%s\n",

   376

					"R  ", i,

   377

					(unsigned long long)le64_to_cpu(u1->a),

   378

					(unsigned long long)le64_to_cpu(u1->b),

   379

					(unsigned long long)le64_to_cpu(u1->c),

   380

					(unsigned long long)le64_to_cpu(u1->d),

   381

					(unsigned long long)buffer_info->dma,

   382

					buffer_info->skb, next_desc);

   383

   384

				if (netif_msg_pktdata(adapter))

   385

					print_hex_dump(KERN_INFO, "",

   386

						DUMP_PREFIX_ADDRESS, 16, 1,

   387

						phys_to_virt(buffer_info->dma),

   388

						adapter->rx_ps_bsize0, true);

   389

			}

   390

		}

   391

		break;

   392

	default:

   393

	case 0:

   394

		/* Extended Receive Descriptor (Read) Format

   395

		 *

   396

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

   397

		 * 0 |                Buffer Address [63:0]                |

   398

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

   399

		 * 8 |                      Reserved                       |

   400

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

   401

		 */

   402

		pr_info("R  [desc]      [buf addr 63:0 ] [reserved 63:0 ] [bi->dma       ] [bi->skb] <-- Ext (Read) format\n");

   403

		/* Extended Receive Descriptor (Write-Back) Format

   404

		 *

   405

		 *   63       48 47    32 31    24 23            4 3        0

   406

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

   407

		 *   |     RSS Hash      |        |               |         |

   408

		 * 0 +-------------------+  Rsvd  |   Reserved    | MRQ RSS |

   409

		 *   | Packet   | IP     |        |               |  Type   |

   410

		 *   | Checksum | Ident  |        |               |         |

   411

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

   412

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

   413

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

   414

		 *   63       48 47    32 31            20 19               0

   415

		 */

   416

		pr_info("RWB[desc]      [cs ipid    mrq] [vt   ln xe  xs] [bi->skb] <-- Ext (Write-Back) format\n");

   417

   418

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

   419

			const char *next_desc;

   420

   421

			buffer_info = &rx_ring->buffer_info[i];

   422

			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);

   423

			u1 = (struct my_u1 *)rx_desc;

   424

			staterr = le32_to_cpu(rx_desc->wb.upper.status_error);

   425

   426

			if (i == rx_ring->next_to_use)

   427

				next_desc = " NTU";

   428

			else if (i == rx_ring->next_to_clean)

   429

				next_desc = " NTC";

   430

			else

   431

				next_desc = "";

   432

   433

			if (staterr & E1000_RXD_STAT_DD) {

   434

				/* Descriptor Done */

   435

				pr_info("%s[0x%03X]     %016llX %016llX ---------------- %p%s\n",

   436

					"RWB", i,

   437

					(unsigned long long)le64_to_cpu(u1->a),

   438

					(unsigned long long)le64_to_cpu(u1->b),

   439

					buffer_info->skb, next_desc);

   440

			} else {

   441

				pr_info("%s[0x%03X]     %016llX %016llX %016llX %p%s\n",

   442

					"R  ", i,

   443

					(unsigned long long)le64_to_cpu(u1->a),

   444

					(unsigned long long)le64_to_cpu(u1->b),

   445

					(unsigned long long)buffer_info->dma,

   446

					buffer_info->skb, next_desc);

   447

   448

				if (netif_msg_pktdata(adapter))

   449

					print_hex_dump(KERN_INFO, "",

   450

						       DUMP_PREFIX_ADDRESS, 16,

   451

						       1,

   452

						       phys_to_virt

   453

						       (buffer_info->dma),

   454

						       adapter->rx_buffer_len,

   455

						       true);

   456

			}

   457

		}

   458

	}

   459

}

   460

   461

/**

   462

 * e1000_desc_unused - calculate if we have unused descriptors

   463

 **/

   464

static int e1000_desc_unused(struct e1000_ring *ring)

   465

{

   466

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

   467

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

   468

   469

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

   470

}

   471

   472

/**

   473

 * e1000_receive_skb - helper function to handle Rx indications

   474

 * @adapter: board private structure

   475

 * @status: descriptor status field as written by hardware

   476

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

   477

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

   478

 **/

   479

static void e1000_receive_skb(struct e1000_adapter *adapter,

   480

			      struct net_device *netdev, struct sk_buff *skb,

   481

			      u8 status, __le16 vlan)

   482

{

   483

	u16 tag = le16_to_cpu(vlan);

   484

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

   485

   486

	if (status & E1000_RXD_STAT_VP)

   487

		__vlan_hwaccel_put_tag(skb, tag);

   488

   489

	napi_gro_receive(&adapter->napi, skb);

   490

}

   491

   492

/**

   493

 * e1000_rx_checksum - Receive Checksum Offload

   494

 * @adapter: board private structure

   495

 * @status_err: receive descriptor status and error fields

   496

 * @csum: receive descriptor csum field

   497

 * @sk_buff: socket buffer with received data

   498

 **/

   499

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

   500

			      struct sk_buff *skb)

   501

{

   502

	u16 status = (u16)status_err;

   503

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

   504

   505

	skb_checksum_none_assert(skb);

   506

   507

	/* Rx checksum disabled */

   508

	if (!(adapter->netdev->features & NETIF_F_RXCSUM))

   509

		return;

   510

   511

	/* Ignore Checksum bit is set */

   512

	if (status & E1000_RXD_STAT_IXSM)

   513

		return;

   514

   515

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

   516

	if (errors & (E1000_RXD_ERR_TCPE | E1000_RXD_ERR_IPE)) {

   517

		/* let the stack verify checksum errors */

   518

		adapter->hw_csum_err++;

   519

		return;

   520

	}

   521

   522

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

   523

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

   524

		return;

   525

   526

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

   527

	skb->ip_summed = CHECKSUM_UNNECESSARY;

   528

	adapter->hw_csum_good++;

   529

}