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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,

     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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    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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    29

#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>

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#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>

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#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 "2.1.4" DRV_EXTRAVERSION

    60

char e1000e_driver_name[] = "e1000e";

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const char e1000e_driver_version[] = DRV_VERSION;

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    63

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)

    64

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,

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	[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,

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	[board_ich8lan]		= &e1000_ich8_info,

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	[board_ich9lan]		= &e1000_ich9_info,

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	[board_ich10lan]	= &e1000_ich10_info,

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	[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 */

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    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 */

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#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 */

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	{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"},

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	{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

 * @hw: pointer to the HW structure

   152

 * @reginfo: pointer to the register info table

   153

 **/

   154

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

   155

{

   156

	int n = 0;

   157

	char rname[16];

   158

	u32 regs[8];

   159

   160

	switch (reginfo->ofs) {

   161

	case E1000_RXDCTL(0):

   162

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

   163

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

   164

		break;

   165

	case E1000_TXDCTL(0):

   166

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

   167

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

   168

		break;

   169

	case E1000_TARC(0):

   170

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

   171

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

   172

		break;

   173

	default:

   174

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

   175

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

   176

		return;

   177

	}

   178

   179

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

   180

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

   181

}

   182

   183

static void e1000e_dump_ps_pages(struct e1000_adapter *adapter,

   184

				 struct e1000_buffer *bi)

   185

{

   186

	int i;

   187

	struct e1000_ps_page *ps_page;

   188

   189

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

   190

		ps_page = &bi->ps_pages[i];

   191

   192

		if (ps_page->page) {

   193

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

   194

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   195

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

   196

				       PAGE_SIZE, true);

   197

		}

   198

	}

   199

}

   200

   201

/**

   202

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

   203

 * @adapter: board private structure

   204

 **/

   205

static void e1000e_dump(struct e1000_adapter *adapter)

   206

{

   207

	struct net_device *netdev = adapter->netdev;

   208

	struct e1000_hw *hw = &adapter->hw;

   209

	struct e1000_reg_info *reginfo;

   210

	struct e1000_ring *tx_ring = adapter->tx_ring;

   211

	struct e1000_tx_desc *tx_desc;

   212

	struct my_u0 {

   213

		__le64 a;

   214

		__le64 b;

   215

	} *u0;

   216

	struct e1000_buffer *buffer_info;

   217

	struct e1000_ring *rx_ring = adapter->rx_ring;

   218

	union e1000_rx_desc_packet_split *rx_desc_ps;

   219

	union e1000_rx_desc_extended *rx_desc;

   220

	struct my_u1 {

   221

		__le64 a;

   222

		__le64 b;

   223

		__le64 c;

   224

		__le64 d;

   225

	} *u1;

   226

	u32 staterr;

   227

	int i = 0;

   228

   229

	if (!netif_msg_hw(adapter))

   230

		return;

   231

   232

	/* Print netdevice Info */

   233

	if (netdev) {

   234

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

   235

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

   236

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

   237

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

   238

			netdev->last_rx);

   239

	}

   240

   241

	/* Print Registers */

   242

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

   243

	pr_info(" Register Name   Value\n");

   244

	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;

   245

	     reginfo->name; reginfo++) {

   246

		e1000_regdump(hw, reginfo);

   247

	}

   248

   249

	/* Print Tx Ring Summary */

   250

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

   251

		return;

   252

   253

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

   254

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

   255

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

   256

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

   257

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

   258

		(unsigned long long)buffer_info->dma,

   259

		buffer_info->length,

   260

		buffer_info->next_to_watch,

   261

		(unsigned long long)buffer_info->time_stamp);

   262

   263

	/* Print Tx Ring */

   264

	if (!netif_msg_tx_done(adapter))

   265

		goto rx_ring_summary;

   266

   267

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

   268

   269

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

   270

	 *

   271

	 * Legacy Transmit Descriptor

   272

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

   273

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

   274

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

   275

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

   276

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

   277

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

   278

	 *

   279

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

   280

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

   281

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

   282

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

   283

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

   284

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

   285

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

   286

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

   287

	 *

   288

	 * Extended Data Descriptor (DTYP=0x1)

   289

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

   290

	 * 0 |                     Buffer Address [63:0]                      |

   291

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

   292

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

   293

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

   294

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

   295

	 */

   296

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

   297

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

   298

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

   299

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

   300

		const char *next_desc;

   301

		tx_desc = E1000_TX_DESC(*tx_ring, i);

   302

		buffer_info = &tx_ring->buffer_info[i];

   303

		u0 = (struct my_u0 *)tx_desc;

   304

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

   305

			next_desc = " NTC/U";

   306

		else if (i == tx_ring->next_to_use)

   307

			next_desc = " NTU";

   308

		else if (i == tx_ring->next_to_clean)

   309

			next_desc = " NTC";

   310

		else

   311

			next_desc = "";

   312

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

   313

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

   314

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

   315

			i,

   316

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

   317

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

   318

			(unsigned long long)buffer_info->dma,

   319

			buffer_info->length, buffer_info->next_to_watch,

   320

			(unsigned long long)buffer_info->time_stamp,

   321

			buffer_info->skb, next_desc);

   322

   323

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

   324

			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,

   325

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

   326

				       buffer_info->skb->len, true);

   327

	}

   328

   329

	/* Print Rx Ring Summary */

   330

rx_ring_summary:

   331

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

   332

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

   333

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

   334

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

   335

   336

	/* Print Rx Ring */

   337

	if (!netif_msg_rx_status(adapter))

   338

		return;

   339

   340

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

   341

	switch (adapter->rx_ps_pages) {

   342

	case 1:

   343

	case 2:

   344

	case 3:

   345

		/* [Extended] Packet Split Receive Descriptor Format

   346

		 *

   347

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

   348

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

   349

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

   350

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

   351

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

   352

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

   353

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

   354

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

   355

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

   356

		 */

   357

		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");

   358

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

   359

		 *

   360

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

   361

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

   362

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

   363

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

   364

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

   365

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

   366

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

   367

		 *   63       48 47    32 31            20 19               0

   368

		 */

   369

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

   370

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

   371

			const char *next_desc;

   372

			buffer_info = &rx_ring->buffer_info[i];

   373

			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);

   374

			u1 = (struct my_u1 *)rx_desc_ps;

   375

			staterr =

   376

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

   377

   378

			if (i == rx_ring->next_to_use)

   379

				next_desc = " NTU";

   380

			else if (i == rx_ring->next_to_clean)

   381

				next_desc = " NTC";

   382

			else

   383

				next_desc = "";

   384

   385

			if (staterr & E1000_RXD_STAT_DD) {

   386

				/* Descriptor Done */

   387

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

   388

					"RWB", i,

   389

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

   390

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

   391

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

   392

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

   393

					buffer_info->skb, next_desc);

   394

			} else {

   395

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

   396

					"R  ", i,

   397

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

   398

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

   399

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

   400

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

   401

					(unsigned long long)buffer_info->dma,

   402

					buffer_info->skb, next_desc);

   403

   404

				if (netif_msg_pktdata(adapter))

   405

					e1000e_dump_ps_pages(adapter,

   406

							     buffer_info);

   407

			}

   408

		}

   409

		break;

   410

	default:

   411

	case 0:

   412

		/* Extended Receive Descriptor (Read) Format

   413

		 *

   414

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

   415

		 * 0 |                Buffer Address [63:0]                |

   416

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

   417

		 * 8 |                      Reserved                       |

   418

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

   419

		 */

   420

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

   421

		/* Extended Receive Descriptor (Write-Back) Format

   422

		 *

   423

		 *   63       48 47    32 31    24 23            4 3        0

   424

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

   425

		 *   |     RSS Hash      |        |               |         |

   426

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

   427

		 *   | Packet   | IP     |        |               |  Type   |

   428

		 *   | Checksum | Ident  |        |               |         |

   429

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

   430

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

   431

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

   432

		 *   63       48 47    32 31            20 19               0

   433

		 */

   434

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

   435

   436

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

   437

			const char *next_desc;

   438

   439

			buffer_info = &rx_ring->buffer_info[i];

   440

			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);

   441

			u1 = (struct my_u1 *)rx_desc;

   442

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

   443

   444

			if (i == rx_ring->next_to_use)

   445

				next_desc = " NTU";

   446

			else if (i == rx_ring->next_to_clean)

   447

				next_desc = " NTC";

   448

			else

   449

				next_desc = "";

   450

   451

			if (staterr & E1000_RXD_STAT_DD) {

   452

				/* Descriptor Done */

   453

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

   454

					"RWB", i,

   455

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

   456

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

   457

					buffer_info->skb, next_desc);

   458

			} else {

   459

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

   460

					"R  ", i,

   461

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

   462

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

   463

					(unsigned long long)buffer_info->dma,

   464

					buffer_info->skb, next_desc);

   465

   466

				if (netif_msg_pktdata(adapter) &&

   467

				    buffer_info->skb)

   468

					print_hex_dump(KERN_INFO, "",

   469

						       DUMP_PREFIX_ADDRESS, 16,

   470

						       1,

   471

						       buffer_info->skb->data,

   472

						       adapter->rx_buffer_len,

   473

						       true);

   474

			}

   475

		}

   476

	}

   477

}

   478

   479

/**

   480

 * e1000_desc_unused - calculate if we have unused descriptors

   481

 **/

   482

static int e1000_desc_unused(struct e1000_ring *ring)

   483

{

   484

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

   485

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

   486

   487

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

   488

}

   489

   490

/**

   491

 * e1000_receive_skb - helper function to handle Rx indications

   492

 * @adapter: board private structure

   493

 * @status: descriptor status field as written by hardware

   494

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

   495

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

   496

 **/

   497

static void e1000_receive_skb(struct e1000_adapter *adapter,

   498

			      struct net_device *netdev, struct sk_buff *skb,

   499

			      u8 status, __le16 vlan)

   500

{

   501

	u16 tag = le16_to_cpu(vlan);

   502

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

   503

   504

	if (status & E1000_RXD_STAT_VP)

   505

		__vlan_hwaccel_put_tag(skb, tag);

   506

   507

	napi_gro_receive(&adapter->napi, skb);

   508

}

   509

   510

/**

   511

 * e1000_rx_checksum - Receive Checksum Offload

   512

 * @adapter: board private structure

   513

 * @status_err: receive descriptor status and error fields

   514

 * @csum: receive descriptor csum field

   515

 * @sk_buff: socket buffer with received data

   516

 **/

   517

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

   518

			      struct sk_buff *skb)

   519

{

   520

	u16 status = (u16)status_err;

   521

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

   522

   523

	skb_checksum_none_assert(skb);

   524

   525

	/* Rx checksum disabled */

   526

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

   527

		return;

   528

   529

	/* Ignore Checksum bit is set */

   530