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

     2

     3

  Intel PRO/1000 Linux driver

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  Copyright(c) 1999 - 2012 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,

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  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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    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>

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  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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/module.h>

    32

#include <linux/types.h>

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#include <linux/init.h>

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#include <linux/pci.h>

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#include <linux/vmalloc.h>

    36

#include <linux/pagemap.h>

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#include <linux/delay.h>

    38

#include <linux/netdevice.h>

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#include <linux/interrupt.h>

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#include <linux/tcp.h>

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#include <linux/ipv6.h>

    42

#include <linux/slab.h>

    43

#include <net/checksum.h>

    44

#include <net/ip6_checksum.h>

    45

#include <linux/mii.h>

    46

#include <linux/ethtool.h>

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#include <linux/if_vlan.h>

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#include <linux/cpu.h>

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#include <linux/smp.h>

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#include <linux/pm_qos.h>

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#include <linux/pm_runtime.h>

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#include <linux/aer.h>

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#include <linux/prefetch.h>

    54

    55

#include "e1000.h"

    56

    57

#define DRV_EXTRAVERSION "-k"

    58

    59

#define DRV_VERSION "2.0.0" DRV_EXTRAVERSION

    60

char e1000e_driver_name[] = "e1000e";

    61

const char e1000e_driver_version[] = DRV_VERSION;

    62

    63

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)

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static int debug = -1;

    65

module_param(debug, int, 0);

    66

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

    67

    68

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

    69

    70

static const struct e1000_info *e1000_info_tbl[] = {

    71

	[board_82571]		= &e1000_82571_info,

    72

	[board_82572]		= &e1000_82572_info,

    73

	[board_82573]		= &e1000_82573_info,

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	[board_82574]		= &e1000_82574_info,

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	[board_82583]		= &e1000_82583_info,

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	[board_80003es2lan]	= &e1000_es2_info,

    77

	[board_ich8lan]		= &e1000_ich8_info,

    78

	[board_ich9lan]		= &e1000_ich9_info,

    79

	[board_ich10lan]	= &e1000_ich10_info,

    80

	[board_pchlan]		= &e1000_pch_info,

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	[board_pch2lan]		= &e1000_pch2_info,

    82

	[board_pch_lpt]		= &e1000_pch_lpt_info,

    83

};

    84

    85

struct e1000_reg_info {

    86

	u32 ofs;

    87

	char *name;

    88

};

    89

    90

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

    91

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

    92

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

    93

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

    94

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

    95

    96

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

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

    98

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

    99

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

   100

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

   101

   102

static const struct e1000_reg_info e1000_reg_info_tbl[] = {

   103

   104

	/* General Registers */

   105

	{E1000_CTRL, "CTRL"},

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	{E1000_STATUS, "STATUS"},

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	{E1000_CTRL_EXT, "CTRL_EXT"},

   108

   109

	/* Interrupt Registers */

   110

	{E1000_ICR, "ICR"},

   111

   112

	/* Rx Registers */

   113

	{E1000_RCTL, "RCTL"},

   114

	{E1000_RDLEN(0), "RDLEN"},

   115

	{E1000_RDH(0), "RDH"},

   116

	{E1000_RDT(0), "RDT"},

   117

	{E1000_RDTR, "RDTR"},

   118

	{E1000_RXDCTL(0), "RXDCTL"},

   119

	{E1000_ERT, "ERT"},

   120

	{E1000_RDBAL(0), "RDBAL"},

   121

	{E1000_RDBAH(0), "RDBAH"},

   122

	{E1000_RDFH, "RDFH"},

   123

	{E1000_RDFT, "RDFT"},

   124

	{E1000_RDFHS, "RDFHS"},

   125

	{E1000_RDFTS, "RDFTS"},

   126

	{E1000_RDFPC, "RDFPC"},

   127

   128

	/* Tx Registers */

   129

	{E1000_TCTL, "TCTL"},

   130

	{E1000_TDBAL(0), "TDBAL"},

   131

	{E1000_TDBAH(0), "TDBAH"},

   132

	{E1000_TDLEN(0), "TDLEN"},

   133

	{E1000_TDH(0), "TDH"},

   134

	{E1000_TDT(0), "TDT"},

   135

	{E1000_TIDV, "TIDV"},

   136

	{E1000_TXDCTL(0), "TXDCTL"},

   137

	{E1000_TADV, "TADV"},

   138

	{E1000_TARC(0), "TARC"},

   139

	{E1000_TDFH, "TDFH"},

   140

	{E1000_TDFT, "TDFT"},

   141

	{E1000_TDFHS, "TDFHS"},

   142

	{E1000_TDFTS, "TDFTS"},

   143

	{E1000_TDFPC, "TDFPC"},

   144

   145

	/* List Terminator */

   146

	{0, NULL}

   147

};

   148

   149

/*

   150

 * e1000_regdump - register printout routine

   151

 */

   152

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

   153

{

   154

	int n = 0;

   155

	char rname[16];

   156

	u32 regs[8];

   157

   158

	switch (reginfo->ofs) {

   159

	case E1000_RXDCTL(0):

   160

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

   161

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

   162

		break;

   163

	case E1000_TXDCTL(0):

   164

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

   165

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

   166

		break;

   167

	case E1000_TARC(0):

   168

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

   169

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

   170

		break;

   171

	default:

   172

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

   173

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

   174

		return;

   175

	}

   176

   177

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

   178

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

   179

}

   180

   181

static void e1000e_dump_ps_pages(struct e1000_adapter *adapter,

   182

				 struct e1000_buffer *bi)

   183

{

   184

	int i;

   185

	struct e1000_ps_page *ps_page;

   186

   187

	for (i = 0; i < adapter->rx_ps_pages; i++) {

   188

		ps_page = &bi->ps_pages[i];

   189

   190

		if (ps_page->page) {

   191

			pr_info("packet dump for ps_page %d:\n", i);

   192

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   193

				       16, 1, page_address(ps_page->page),

   194

				       PAGE_SIZE, true);

   195

		}

   196

	}

   197

}

   198

   199

/*

   200

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

   201

 */

   202

static void e1000e_dump(struct e1000_adapter *adapter)

   203

{

   204

	struct net_device *netdev = adapter->netdev;

   205

	struct e1000_hw *hw = &adapter->hw;

   206

	struct e1000_reg_info *reginfo;

   207

	struct e1000_ring *tx_ring = adapter->tx_ring;

   208

	struct e1000_tx_desc *tx_desc;

   209

	struct my_u0 {

   210

		__le64 a;

   211

		__le64 b;

   212

	} *u0;

   213

	struct e1000_buffer *buffer_info;

   214

	struct e1000_ring *rx_ring = adapter->rx_ring;

   215

	union e1000_rx_desc_packet_split *rx_desc_ps;

   216

	union e1000_rx_desc_extended *rx_desc;

   217

	struct my_u1 {

   218

		__le64 a;

   219

		__le64 b;

   220

		__le64 c;

   221

		__le64 d;

   222

	} *u1;

   223

	u32 staterr;

   224

	int i = 0;

   225

   226

	if (!netif_msg_hw(adapter))

   227

		return;

   228

   229

	/* Print netdevice Info */

   230

	if (netdev) {

   231

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

   232

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

   233

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

   234

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

   235

			netdev->last_rx);

   236

	}

   237

   238

	/* Print Registers */

   239

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

   240

	pr_info(" Register Name   Value\n");

   241

	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;

   242

	     reginfo->name; reginfo++) {

   243

		e1000_regdump(hw, reginfo);

   244

	}

   245

   246

	/* Print Tx Ring Summary */

   247

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

   248

		return;

   249

   250

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

   251

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

   252

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

   253

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

   254

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

   255

		(unsigned long long)buffer_info->dma,

   256

		buffer_info->length,

   257

		buffer_info->next_to_watch,

   258

		(unsigned long long)buffer_info->time_stamp);

   259

   260

	/* Print Tx Ring */

   261

	if (!netif_msg_tx_done(adapter))

   262

		goto rx_ring_summary;

   263

   264

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

   265

   266

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

   267

	 *

   268

	 * Legacy Transmit Descriptor

   269

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

   270

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

   271

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

   272

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

   273

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

   274

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

   275

	 *

   276

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

   277

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

   278

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

   279

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

   280

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

   281

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

   282

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

   283

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

   284

	 *

   285

	 * Extended Data Descriptor (DTYP=0x1)

   286

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

   287

	 * 0 |                     Buffer Address [63:0]                      |

   288

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

   289

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

   290

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

   291

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

   292

	 */

   293

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

   294

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

   295

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

   296

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

   297

		const char *next_desc;

   298

		tx_desc = E1000_TX_DESC(*tx_ring, i);

   299

		buffer_info = &tx_ring->buffer_info[i];

   300

		u0 = (struct my_u0 *)tx_desc;

   301

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

   302

			next_desc = " NTC/U";

   303

		else if (i == tx_ring->next_to_use)

   304

			next_desc = " NTU";

   305

		else if (i == tx_ring->next_to_clean)

   306

			next_desc = " NTC";

   307

		else

   308

			next_desc = "";

   309

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

   310

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

   311

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

   312

			i,

   313

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

   314

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

   315

			(unsigned long long)buffer_info->dma,

   316

			buffer_info->length, buffer_info->next_to_watch,

   317

			(unsigned long long)buffer_info->time_stamp,

   318

			buffer_info->skb, next_desc);

   319

   320

		if (netif_msg_pktdata(adapter) && buffer_info->skb)

   321

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   322

				       16, 1, buffer_info->skb->data,

   323

				       buffer_info->skb->len, true);

   324

	}

   325

   326

	/* Print Rx Ring Summary */

   327

rx_ring_summary:

   328

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

   329

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

   330

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

   331

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

   332

   333

	/* Print Rx Ring */

   334

	if (!netif_msg_rx_status(adapter))

   335

		return;

   336

   337

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

   338

	switch (adapter->rx_ps_pages) {

   339

	case 1:

   340

	case 2:

   341

	case 3:

   342

		/* [Extended] Packet Split Receive Descriptor Format

   343

		 *

   344

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

   345

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

   346

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

   347

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

   348

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

   349

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

   350

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

   351

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

   352

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

   353

		 */

   354

		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");

   355

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

   356

		 *

   357

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

   358

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

   359

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

   360

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

   361

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

   362

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

   363

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

   364

		 *   63       48 47    32 31            20 19               0

   365

		 */

   366

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

   367

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

   368

			const char *next_desc;

   369

			buffer_info = &rx_ring->buffer_info[i];

   370

			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);

   371

			u1 = (struct my_u1 *)rx_desc_ps;

   372

			staterr =

   373

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

   374

   375

			if (i == rx_ring->next_to_use)

   376

				next_desc = " NTU";

   377

			else if (i == rx_ring->next_to_clean)

   378

				next_desc = " NTC";

   379

			else

   380

				next_desc = "";

   381

   382

			if (staterr & E1000_RXD_STAT_DD) {

   383

				/* Descriptor Done */

   384

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

   385

					"RWB", i,

   386

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

   387

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

   388

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

   389

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

   390

					buffer_info->skb, next_desc);

   391

			} else {

   392

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

   393

					"R  ", i,

   394

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

   395

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

   396

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

   397

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

   398

					(unsigned long long)buffer_info->dma,

   399

					buffer_info->skb, next_desc);

   400

   401

				if (netif_msg_pktdata(adapter))

   402

					e1000e_dump_ps_pages(adapter,

   403

							     buffer_info);

   404

			}

   405

		}

   406

		break;

   407

	default:

   408

	case 0:

   409

		/* Extended Receive Descriptor (Read) Format

   410

		 *

   411

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

   412

		 * 0 |                Buffer Address [63:0]                |

   413

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

   414

		 * 8 |                      Reserved                       |

   415

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

   416

		 */

   417

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

   418

		/* Extended Receive Descriptor (Write-Back) Format

   419

		 *

   420

		 *   63       48 47    32 31    24 23            4 3        0

   421

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

   422

		 *   |     RSS Hash      |        |               |         |

   423

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

   424

		 *   | Packet   | IP     |        |               |  Type   |

   425

		 *   | Checksum | Ident  |        |               |         |

   426

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

   427

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

   428

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

   429

		 *   63       48 47    32 31            20 19               0

   430

		 */

   431

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

   432

   433

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

   434

			const char *next_desc;

   435

   436

			buffer_info = &rx_ring->buffer_info[i];

   437

			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);

   438

			u1 = (struct my_u1 *)rx_desc;

   439

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

   440

   441

			if (i == rx_ring->next_to_use)

   442

				next_desc = " NTU";

   443

			else if (i == rx_ring->next_to_clean)

   444

				next_desc = " NTC";

   445

			else

   446

				next_desc = "";

   447

   448

			if (staterr & E1000_RXD_STAT_DD) {

   449

				/* Descriptor Done */

   450

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

   451

					"RWB", i,

   452

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

   453

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

   454

					buffer_info->skb, next_desc);

   455

			} else {

   456

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

   457

					"R  ", i,

   458

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

   459

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

   460

					(unsigned long long)buffer_info->dma,

   461

					buffer_info->skb, next_desc);

   462

   463

				if (netif_msg_pktdata(adapter) &&

   464

				    buffer_info->skb)

   465

					print_hex_dump(KERN_INFO, "",

   466

						       DUMP_PREFIX_ADDRESS, 16,

   467

						       1,

   468

						       buffer_info->skb->data,

   469

						       adapter->rx_buffer_len,

   470

						       true);

   471

			}

   472

		}

   473

	}

   474

}

   475

   476

/**

   477

 * e1000_desc_unused - calculate if we have unused descriptors

   478

 **/

   479

static int e1000_desc_unused(struct e1000_ring *ring)

   480

{

   481

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

   482

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

   483

   484

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

   485

}

   486

   487

/**

   488

 * e1000_receive_skb - helper function to handle Rx indications

   489

 * @adapter: board private structure

   490

 * @status: descriptor status field as written by hardware

   491

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

   492

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

   493

 **/

   494

static void e1000_receive_skb(struct e1000_adapter *adapter,

   495

			      struct net_device *netdev, struct sk_buff *skb,

   496

			      u8 status, __le16 vlan)

   497

{

   498

	u16 tag = le16_to_cpu(vlan);

   499

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

   500

   501

	if (status & E1000_RXD_STAT_VP)

   502

		__vlan_hwaccel_put_tag(skb, tag);

   503

   504

	napi_gro_receive(&adapter->napi, skb);

   505

}

   506

   507

/**

   508

 * e1000_rx_checksum - Receive Checksum Offload

   509

 * @adapter: board private structure

   510

 * @status_err: receive descriptor status and error fields

   511

 * @csum: receive descriptor csum field

   512

 * @sk_buff: socket buffer with received data

   513

 **/

   514

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

   515

			      struct sk_buff *skb)

   516

{

   517

	u16 status = (u16)status_err;

   518

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

   519

   520

	skb_checksum_none_assert(skb);

   521

   522

	/* Rx checksum disabled */

   523

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

   524

		return;

   525

   526

	/* Ignore Checksum bit is set */

   527

	if (status & E1000_RXD_STAT_IXSM)

   528

		return;

   529

   530