1

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

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2011 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

    26

    27

  vim: noexpandtab

    28

    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 "e1000-3.2-ethercat.h"

    58

    59

#define DRV_EXTRAVERSION "-k-EtherCAT"

    60

    61

#define DRV_VERSION "1.5.1" DRV_EXTRAVERSION

    62

char e1000e_driver_name[] = "ec_e1000e";

    63

const char e1000e_driver_version[] = DRV_VERSION;

    64

    65

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

    66

    67

static const struct e1000_info *e1000_info_tbl[] = {

    68

	[board_82571]		= &e1000_82571_info,

    69

	[board_82572]		= &e1000_82572_info,

    70

	[board_82573]		= &e1000_82573_info,

    71

	[board_82574]		= &e1000_82574_info,

    72

	[board_82583]		= &e1000_82583_info,

    73

	[board_80003es2lan]	= &e1000_es2_info,

    74

	[board_ich8lan]		= &e1000_ich8_info,

    75

	[board_ich9lan]		= &e1000_ich9_info,

    76

	[board_ich10lan]	= &e1000_ich10_info,

    77

	[board_pchlan]		= &e1000_pch_info,

    78

	[board_pch2lan]		= &e1000_pch2_info,

    79

};

    80

    81

struct e1000_reg_info {

    82

	u32 ofs;

    83

	char *name;

    84

};

    85

    86

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

    87

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

    88

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

    89

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

    90

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

    91

    92

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

    93

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

    94

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

    95

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

    96

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

    97

    98

static const struct e1000_reg_info e1000_reg_info_tbl[] = {

    99

   100

	/* General Registers */

   101

	{E1000_CTRL, "CTRL"},

   102

	{E1000_STATUS, "STATUS"},

   103

	{E1000_CTRL_EXT, "CTRL_EXT"},

   104

   105

	/* Interrupt Registers */

   106

	{E1000_ICR, "ICR"},

   107

   108

	/* Rx Registers */

   109

	{E1000_RCTL, "RCTL"},

   110

	{E1000_RDLEN, "RDLEN"},

   111

	{E1000_RDH, "RDH"},

   112

	{E1000_RDT, "RDT"},

   113

	{E1000_RDTR, "RDTR"},

   114

	{E1000_RXDCTL(0), "RXDCTL"},

   115

	{E1000_ERT, "ERT"},

   116

	{E1000_RDBAL, "RDBAL"},

   117

	{E1000_RDBAH, "RDBAH"},

   118

	{E1000_RDFH, "RDFH"},

   119

	{E1000_RDFT, "RDFT"},

   120

	{E1000_RDFHS, "RDFHS"},

   121

	{E1000_RDFTS, "RDFTS"},

   122

	{E1000_RDFPC, "RDFPC"},

   123

   124

	/* Tx Registers */

   125

	{E1000_TCTL, "TCTL"},

   126

	{E1000_TDBAL, "TDBAL"},

   127

	{E1000_TDBAH, "TDBAH"},

   128

	{E1000_TDLEN, "TDLEN"},

   129

	{E1000_TDH, "TDH"},

   130

	{E1000_TDT, "TDT"},

   131

	{E1000_TIDV, "TIDV"},

   132

	{E1000_TXDCTL(0), "TXDCTL"},

   133

	{E1000_TADV, "TADV"},

   134

	{E1000_TARC(0), "TARC"},

   135

	{E1000_TDFH, "TDFH"},

   136

	{E1000_TDFT, "TDFT"},

   137

	{E1000_TDFHS, "TDFHS"},

   138

	{E1000_TDFTS, "TDFTS"},

   139

	{E1000_TDFPC, "TDFPC"},

   140

   141

	/* List Terminator */

   142

	{}

   143

};

   144

   145

/*

   146

 * e1000_regdump - register printout routine

   147

 */

   148

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

   149

{

   150

	int n = 0;

   151

	char rname[16];

   152

	u32 regs[8];

   153

   154

	switch (reginfo->ofs) {

   155

	case E1000_RXDCTL(0):

   156

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

   157

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

   158

		break;

   159

	case E1000_TXDCTL(0):

   160

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

   161

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

   162

		break;

   163

	case E1000_TARC(0):

   164

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

   165

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

   166

		break;

   167

	default:

   168

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

   169

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

   170

		return;

   171

	}

   172

   173

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

   174

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

   175

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

   176

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

   177

	printk(KERN_CONT "\n");

   178

}

   179

   180

/*

   181

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

   182

 */

   183

static void e1000e_dump(struct e1000_adapter *adapter)

   184

{

   185

	struct net_device *netdev = adapter->netdev;

   186

	struct e1000_hw *hw = &adapter->hw;

   187

	struct e1000_reg_info *reginfo;

   188

	struct e1000_ring *tx_ring = adapter->tx_ring;

   189

	struct e1000_tx_desc *tx_desc;

   190

	struct my_u0 {

   191

		u64 a;

   192

		u64 b;

   193

	} *u0;

   194

	struct e1000_buffer *buffer_info;

   195

	struct e1000_ring *rx_ring = adapter->rx_ring;

   196

	union e1000_rx_desc_packet_split *rx_desc_ps;

   197

	union e1000_rx_desc_extended *rx_desc;

   198

	struct my_u1 {

   199

		u64 a;

   200

		u64 b;

   201

		u64 c;

   202

		u64 d;

   203

	} *u1;

   204

	u32 staterr;

   205

	int i = 0;

   206

   207

	if (!netif_msg_hw(adapter))

   208

		return;

   209

   210

	/* Print netdevice Info */

   211

	if (netdev) {

   212

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

   213

		printk(KERN_INFO "Device Name     state            "

   214

		       "trans_start      last_rx\n");

   215

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

   216

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

   217

		       netdev->last_rx);

   218

	}

   219

   220

	/* Print Registers */

   221

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

   222

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

   223

	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;

   224

	     reginfo->name; reginfo++) {

   225

		e1000_regdump(hw, reginfo);

   226

	}

   227

   228

	/* Print Tx Ring Summary */

   229

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

   230

		goto exit;

   231

   232

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

   233

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

   234

	       " leng ntw timestamp\n");

   235

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

   236

	printk(KERN_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

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

   277

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

   278

	       "<-- Legacy format\n");

   279

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

   280

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

   281

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

   282

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

   283

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

   284

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

   285

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

   286

		tx_desc = E1000_TX_DESC(*tx_ring, i);

   287

		buffer_info = &tx_ring->buffer_info[i];

   288

		u0 = (struct my_u0 *)tx_desc;

   289

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

   290

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

   291

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

   292

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

   293

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

   294

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

   295

		       (unsigned long long)buffer_info->dma,

   296

		       buffer_info->length, buffer_info->next_to_watch,

   297

		       (unsigned long long)buffer_info->time_stamp,

   298

		       buffer_info->skb);

   299

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

   300

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

   301

		else if (i == tx_ring->next_to_use)

   302

			printk(KERN_CONT " NTU\n");

   303

		else if (i == tx_ring->next_to_clean)

   304

			printk(KERN_CONT " NTC\n");

   305

		else

   306

			printk(KERN_CONT "\n");

   307

   308

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

   309

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   310

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

   311

				       buffer_info->length, true);

   312

	}

   313

   314

	/* Print Rx Ring Summary */

   315

rx_ring_summary:

   316

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

   317

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

   318

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

   319

	       rx_ring->next_to_use, rx_ring->next_to_clean);

   320

   321

	/* Print Rx Ring */

   322

	if (!netif_msg_rx_status(adapter))

   323

		goto exit;

   324

   325

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

   326

	switch (adapter->rx_ps_pages) {

   327

	case 1:

   328

	case 2:

   329

	case 3:

   330

		/* [Extended] Packet Split Receive Descriptor Format

   331

		 *

   332

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

   333

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

   334

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

   335

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

   336

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

   337

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

   338

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

   339

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

   340

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

   341

		 */

   342

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

   343

		       "[buffer 1 63:0 ] "

   344

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

   345

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

   346

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

   347

		 *

   348

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

   349

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

   350

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

   351

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

   352

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

   353

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

   354

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

   355

		 *   63       48 47    32 31            20 19               0

   356

		 */

   357

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

   358

		       "[vl   l0 ee  es] "

   359

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

   360

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

   361

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

   362

			buffer_info = &rx_ring->buffer_info[i];

   363

			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);

   364

			u1 = (struct my_u1 *)rx_desc_ps;

   365

			staterr =

   366

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

   367

			if (staterr & E1000_RXD_STAT_DD) {

   368

				/* Descriptor Done */

   369

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

   370

				       "%016llX %016llX %016llX "

   371

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

   372

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

   373

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

   374

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

   375

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

   376

				       buffer_info->skb);

   377

			} else {

   378

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

   379

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

   380

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

   381

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

   382

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

   383

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

   384

				       (unsigned long long)buffer_info->dma,

   385

				       buffer_info->skb);

   386

   387

				if (netif_msg_pktdata(adapter))

   388

					print_hex_dump(KERN_INFO, "",

   389

						DUMP_PREFIX_ADDRESS, 16, 1,

   390

						phys_to_virt(buffer_info->dma),

   391

						adapter->rx_ps_bsize0, true);

   392

			}

   393

   394

			if (i == rx_ring->next_to_use)

   395

				printk(KERN_CONT " NTU\n");

   396

			else if (i == rx_ring->next_to_clean)

   397

				printk(KERN_CONT " NTC\n");

   398

			else

   399

				printk(KERN_CONT "\n");

   400

		}

   401

		break;

   402

	default:

   403

	case 0:

   404

		/* Extended Receive Descriptor (Read) Format

   405

		 *

   406

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

   407

		 * 0 |                Buffer Address [63:0]                |

   408

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

   409

		 * 8 |                      Reserved                       |

   410

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

   411

		 */

   412

		printk(KERN_INFO "R  [desc]      [buf addr 63:0 ] "

   413

		       "[reserved 63:0 ] [bi->dma       ] "

   414

		       "[bi->skb] <-- Ext (Read) format\n");

   415

		/* Extended Receive Descriptor (Write-Back) Format

   416

		 *

   417

		 *   63       48 47    32 31    24 23            4 3        0

   418

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

   419

		 *   |     RSS Hash      |        |               |         |

   420

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

   421

		 *   | Packet   | IP     |        |               |  Type   |

   422

		 *   | Checksum | Ident  |        |               |         |

   423

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

   424

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

   425

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

   426

		 *   63       48 47    32 31            20 19               0

   427

		 */

   428

		printk(KERN_INFO "RWB[desc]      [cs ipid    mrq] "

   429

		       "[vt   ln xe  xs] "

   430

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

   431

   432

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

   433

			buffer_info = &rx_ring->buffer_info[i];

   434

			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);

   435

			u1 = (struct my_u1 *)rx_desc;

   436

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

   437

			if (staterr & E1000_RXD_STAT_DD) {

   438

				/* Descriptor Done */

   439

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

   440

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

   441

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

   442

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

   443

				       buffer_info->skb);

   444

			} else {

   445

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

   446

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

   447

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

   448

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

   449

				       (unsigned long long)buffer_info->dma,

   450

				       buffer_info->skb);

   451

   452

				if (netif_msg_pktdata(adapter))

   453

					print_hex_dump(KERN_INFO, "",

   454

						       DUMP_PREFIX_ADDRESS, 16,

   455

						       1,

   456

						       phys_to_virt

   457

						       (buffer_info->dma),

   458

						       adapter->rx_buffer_len,

   459

						       true);

   460

			}

   461

   462

			if (i == rx_ring->next_to_use)

   463

				printk(KERN_CONT " NTU\n");

   464

			else if (i == rx_ring->next_to_clean)

   465

				printk(KERN_CONT " NTC\n");

   466

			else

   467

				printk(KERN_CONT "\n");

   468

		}

   469

	}

   470

   471

exit:

   472

	return;

   473

}

   474

   475

/**

   476

 * e1000_desc_unused - calculate if we have unused descriptors

   477

 **/

   478

static int e1000_desc_unused(struct e1000_ring *ring)

   479

{

   480

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

   481

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

   482

   483

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

   484

}

   485

   486

/**

   487

 * e1000_receive_skb - helper function to handle Rx indications

   488

 * @adapter: board private structure

   489

 * @status: descriptor status field as written by hardware

   490

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

   491

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

   492

 **/

   493

static void e1000_receive_skb(struct e1000_adapter *adapter,

   494

			      struct net_device *netdev, struct sk_buff *skb,

   495

			      u8 status, __le16 vlan)

   496

{

   497

	u16 tag = le16_to_cpu(vlan);

   498

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

   499

   500

	if (status & E1000_RXD_STAT_VP)

   501

		__vlan_hwaccel_put_tag(skb, tag);

   502

   503

	napi_gro_receive(&adapter->napi, skb);

   504

}

   505

   506

/**

   507

 * e1000_rx_checksum - Receive Checksum Offload

   508

 * @adapter:     board private structure

   509

 * @status_err:  receive descriptor status and error fields

   510

 * @csum:	receive descriptor csum field

   511

 * @sk_buff:     socket buffer with received data

   512

 **/

   513

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

   514

			      u32 csum, struct sk_buff *skb)

   515

{

   516

	u16 status = (u16)status_err;

   517

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

   518

   519

	skb_checksum_none_assert(skb);

   520

   521

	/* Ignore Checksum bit is set */

   522

	if (status & E1000_RXD_STAT_IXSM)

   523

		return;

   524

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

   525

	if (errors & E1000_RXD_ERR_TCPE) {

   526

		/* let the stack verify checksum errors */

   527

		adapter->hw_csum_err++;

   528

		return;

   529

	}

   530