netdev.c

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

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2013 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/tcp.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/aer.h>
#include <linux/prefetch.h>

#include "e1000.h"

#define DRV_EXTRAVERSION "-k"

#define DRV_VERSION "2.2.14" DRV_EXTRAVERSION
char e1000e_driver_name[] = "e1000e";
const char e1000e_driver_version[] = DRV_VERSION;

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

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

static const struct e1000_info *e1000_info_tbl[] = {
	[board_82571]		= &e1000_82571_info,
	[board_82572]		= &e1000_82572_info,
	[board_82573]		= &e1000_82573_info,
	[board_82574]		= &e1000_82574_info,
	[board_82583]		= &e1000_82583_info,
	[board_80003es2lan]	= &e1000_es2_info,
	[board_ich8lan]		= &e1000_ich8_info,
	[board_ich9lan]		= &e1000_ich9_info,
	[board_ich10lan]	= &e1000_ich10_info,
	[board_pchlan]		= &e1000_pch_info,
	[board_pch2lan]		= &e1000_pch2_info,
	[board_pch_lpt]		= &e1000_pch_lpt_info,
};

struct e1000_reg_info {
	u32 ofs;
	char *name;
};

static const struct e1000_reg_info e1000_reg_info_tbl[] = {
	/* General Registers */
	{E1000_CTRL, "CTRL"},
	{E1000_STATUS, "STATUS"},
	{E1000_CTRL_EXT, "CTRL_EXT"},

	/* Interrupt Registers */
	{E1000_ICR, "ICR"},

	/* Rx Registers */
	{E1000_RCTL, "RCTL"},
	{E1000_RDLEN(0), "RDLEN"},
	{E1000_RDH(0), "RDH"},
	{E1000_RDT(0), "RDT"},
	{E1000_RDTR, "RDTR"},
	{E1000_RXDCTL(0), "RXDCTL"},
	{E1000_ERT, "ERT"},
	{E1000_RDBAL(0), "RDBAL"},
	{E1000_RDBAH(0), "RDBAH"},
	{E1000_RDFH, "RDFH"},
	{E1000_RDFT, "RDFT"},
	{E1000_RDFHS, "RDFHS"},
	{E1000_RDFTS, "RDFTS"},
	{E1000_RDFPC, "RDFPC"},

	/* Tx Registers */
	{E1000_TCTL, "TCTL"},
	{E1000_TDBAL(0), "TDBAL"},
	{E1000_TDBAH(0), "TDBAH"},
	{E1000_TDLEN(0), "TDLEN"},
	{E1000_TDH(0), "TDH"},
	{E1000_TDT(0), "TDT"},
	{E1000_TIDV, "TIDV"},
	{E1000_TXDCTL(0), "TXDCTL"},
	{E1000_TADV, "TADV"},
	{E1000_TARC(0), "TARC"},
	{E1000_TDFH, "TDFH"},
	{E1000_TDFT, "TDFT"},
	{E1000_TDFHS, "TDFHS"},
	{E1000_TDFTS, "TDFTS"},
	{E1000_TDFPC, "TDFPC"},

	/* List Terminator */
	{0, NULL}
};

/**
 * e1000_regdump - register printout routine
 * @hw: pointer to the HW structure
 * @reginfo: pointer to the register info table
 **/
static void e1000_regdump(struct e1000_hw *hw, struct e1000_reg_info *reginfo)
{
	int n = 0;
	char rname[16];
	u32 regs[8];

	switch (reginfo->ofs) {
	case E1000_RXDCTL(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_RXDCTL(n));
		break;
	case E1000_TXDCTL(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_TXDCTL(n));
		break;
	case E1000_TARC(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_TARC(n));
		break;
	default:
		pr_info("%-15s %08x\n",
			reginfo->name, __er32(hw, reginfo->ofs));
		return;
	}

	snprintf(rname, 16, "%s%s", reginfo->name, "[0-1]");
	pr_info("%-15s %08x %08x\n", rname, regs[0], regs[1]);
}

static void e1000e_dump_ps_pages(struct e1000_adapter *adapter,
				 struct e1000_buffer *bi)
{
	int i;
	struct e1000_ps_page *ps_page;

	for (i = 0; i < adapter->rx_ps_pages; i++) {
		ps_page = &bi->ps_pages[i];

		if (ps_page->page) {
			pr_info("packet dump for ps_page %d:\n", i);
			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
				       16, 1, page_address(ps_page->page),
				       PAGE_SIZE, true);
		}
	}
}

/**
 * e1000e_dump - Print registers, Tx-ring and Rx-ring
 * @adapter: board private structure
 **/
static void e1000e_dump(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_reg_info *reginfo;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	struct e1000_tx_desc *tx_desc;
	struct my_u0 {
		__le64 a;
		__le64 b;
	} *u0;
	struct e1000_buffer *buffer_info;
	struct e1000_ring *rx_ring = adapter->rx_ring;
	union e1000_rx_desc_packet_split *rx_desc_ps;
	union e1000_rx_desc_extended *rx_desc;
	struct my_u1 {
		__le64 a;
		__le64 b;
		__le64 c;
		__le64 d;
	} *u1;
	u32 staterr;
	int i = 0;

	if (!netif_msg_hw(adapter))
		return;

	/* Print netdevice Info */
	if (netdev) {
		dev_info(&adapter->pdev->dev, "Net device Info\n");
		pr_info("Device Name     state            trans_start      last_rx\n");
		pr_info("%-15s %016lX %016lX %016lX\n",
			netdev->name, netdev->state, netdev->trans_start,
			netdev->last_rx);
	}

	/* Print Registers */
	dev_info(&adapter->pdev->dev, "Register Dump\n");
	pr_info(" Register Name   Value\n");
	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;
	     reginfo->name; reginfo++) {
		e1000_regdump(hw, reginfo);
	}

	/* Print Tx Ring Summary */
	if (!netdev || !netif_running(netdev))
		return;

	dev_info(&adapter->pdev->dev, "Tx Ring Summary\n");
	pr_info("Queue [NTU] [NTC] [bi(ntc)->dma  ] leng ntw timestamp\n");
	buffer_info = &tx_ring->buffer_info[tx_ring->next_to_clean];
	pr_info(" %5d %5X %5X %016llX %04X %3X %016llX\n",
		0, tx_ring->next_to_use, tx_ring->next_to_clean,
		(unsigned long long)buffer_info->dma,
		buffer_info->length,
		buffer_info->next_to_watch,
		(unsigned long long)buffer_info->time_stamp);

	/* Print Tx Ring */
	if (!netif_msg_tx_done(adapter))
		goto rx_ring_summary;

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

	/* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)
	 *
	 * Legacy Transmit Descriptor
	 *   +--------------------------------------------------------------+
	 * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |
	 *   +--------------------------------------------------------------+
	 * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |
	 *   +--------------------------------------------------------------+
	 *   63       48 47        36 35    32 31     24 23    16 15        0
	 *
	 * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload
	 *   63      48 47    40 39       32 31             16 15    8 7      0
	 *   +----------------------------------------------------------------+
	 * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |
	 *   +----------------------------------------------------------------+
	 * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |
	 *   +----------------------------------------------------------------+
	 *   63      48 47    40 39 36 35 32 31   24 23  20 19                0
	 *
	 * Extended Data Descriptor (DTYP=0x1)
	 *   +----------------------------------------------------------------+
	 * 0 |                     Buffer Address [63:0]                      |
	 *   +----------------------------------------------------------------+
	 * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |
	 *   +----------------------------------------------------------------+
	 *   63       48 47     40 39  36 35    32 31     24 23  20 19        0
	 */
	pr_info("Tl[desc]     [address 63:0  ] [SpeCssSCmCsLen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Legacy format\n");
	pr_info("Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Context format\n");
	pr_info("Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Data format\n");
	for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
		const char *next_desc;
		tx_desc = E1000_TX_DESC(*tx_ring, i);
		buffer_info = &tx_ring->buffer_info[i];
		u0 = (struct my_u0 *)tx_desc;
		if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)
			next_desc = " NTC/U";
		else if (i == tx_ring->next_to_use)
			next_desc = " NTU";
		else if (i == tx_ring->next_to_clean)
			next_desc = " NTC";
		else
			next_desc = "";
		pr_info("T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X %016llX %p%s\n",
			(!(le64_to_cpu(u0->b) & (1 << 29)) ? 'l' :
			 ((le64_to_cpu(u0->b) & (1 << 20)) ? 'd' : 'c')),
			i,
			(unsigned long long)le64_to_cpu(u0->a),
			(unsigned long long)le64_to_cpu(u0->b),
			(unsigned long long)buffer_info->dma,
			buffer_info->length, buffer_info->next_to_watch,
			(unsigned long long)buffer_info->time_stamp,
			buffer_info->skb, next_desc);

		if (netif_msg_pktdata(adapter) && buffer_info->skb)
			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
				       16, 1, buffer_info->skb->data,
				       buffer_info->skb->len, true);
	}

	/* Print Rx Ring Summary */
rx_ring_summary:
	dev_info(&adapter->pdev->dev, "Rx Ring Summary\n");
	pr_info("Queue [NTU] [NTC]\n");
	pr_info(" %5d %5X %5X\n",
		0, rx_ring->next_to_use, rx_ring->next_to_clean);

	/* Print Rx Ring */
	if (!netif_msg_rx_status(adapter))
		return;

	dev_info(&adapter->pdev->dev, "Rx Ring Dump\n");
	switch (adapter->rx_ps_pages) {
	case 1:
	case 2:
	case 3:
		/* [Extended] Packet Split Receive Descriptor Format
		 *
		 *    +-----------------------------------------------------+
		 *  0 |                Buffer Address 0 [63:0]              |
		 *    +-----------------------------------------------------+
		 *  8 |                Buffer Address 1 [63:0]              |
		 *    +-----------------------------------------------------+
		 * 16 |                Buffer Address 2 [63:0]              |
		 *    +-----------------------------------------------------+
		 * 24 |                Buffer Address 3 [63:0]              |
		 *    +-----------------------------------------------------+
		 */
		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");
		/* [Extended] Receive Descriptor (Write-Back) Format
		 *
		 *   63       48 47    32 31     13 12    8 7    4 3        0
		 *   +------------------------------------------------------+
		 * 0 | Packet   | IP     |  Rsvd   | MRQ   | Rsvd | MRQ RSS |
		 *   | Checksum | Ident  |         | Queue |      |  Type   |
		 *   +------------------------------------------------------+
		 * 8 | VLAN Tag | Length | Extended Error | Extended Status |
		 *   +------------------------------------------------------+
		 *   63       48 47    32 31            20 19               0
		 */
		pr_info("RWB[desc]      [ck ipid mrqhsh] [vl   l0 ee  es] [ l3  l2  l1 hs] [reserved      ] ---------------- [bi->skb] <-- Ext Rx Write-Back format\n");
		for (i = 0; i < rx_ring->count; i++) {
			const char *next_desc;
			buffer_info = &rx_ring->buffer_info[i];
			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);
			u1 = (struct my_u1 *)rx_desc_ps;
			staterr =
			    le32_to_cpu(rx_desc_ps->wb.middle.status_error);

			if (i == rx_ring->next_to_use)
				next_desc = " NTU";
			else if (i == rx_ring->next_to_clean)
				next_desc = " NTC";
			else
				next_desc = "";

			if (staterr & E1000_RXD_STAT_DD) {
				/* Descriptor Done */
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX ---------------- %p%s\n",
					"RWB", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)le64_to_cpu(u1->c),
					(unsigned long long)le64_to_cpu(u1->d),
					buffer_info->skb, next_desc);
			} else {
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX %016llX %p%s\n",
					"R  ", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)le64_to_cpu(u1->c),
					(unsigned long long)le64_to_cpu(u1->d),
					(unsigned long long)buffer_info->dma,
					buffer_info->skb, next_desc);

				if (netif_msg_pktdata(adapter))
					e1000e_dump_ps_pages(adapter,
							     buffer_info);
			}
		}
		break;
	default:
	case 0:
		/* Extended Receive Descriptor (Read) Format
		 *
		 *   +-----------------------------------------------------+
		 * 0 |                Buffer Address [63:0]                |
		 *   +-----------------------------------------------------+
		 * 8 |                      Reserved                       |
		 *   +-----------------------------------------------------+
		 */
		pr_info("R  [desc]      [buf addr 63:0 ] [reserved 63:0 ] [bi->dma       ] [bi->skb] <-- Ext (Read) format\n");
		/* Extended Receive Descriptor (Write-Back) Format
		 *
		 *   63       48 47    32 31    24 23            4 3        0
		 *   +------------------------------------------------------+
		 *   |     RSS Hash      |        |               |         |
		 * 0 +-------------------+  Rsvd  |   Reserved    | MRQ RSS |
		 *   | Packet   | IP     |        |               |  Type   |
		 *   | Checksum | Ident  |        |               |         |
		 *   +------------------------------------------------------+
		 * 8 | VLAN Tag | Length | Extended Error | Extended Status |
		 *   +------------------------------------------------------+
		 *   63       48 47    32 31            20 19               0
		 */
		pr_info("RWB[desc]      [cs ipid    mrq] [vt   ln xe  xs] [bi->skb] <-- Ext (Write-Back) format\n");

		for (i = 0; i < rx_ring->count; i++) {
			const char *next_desc;

			buffer_info = &rx_ring->buffer_info[i];
			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
			u1 = (struct my_u1 *)rx_desc;
			staterr = le32_to_cpu(rx_desc->wb.upper.status_error);

			if (i == rx_ring->next_to_use)
				next_desc = " NTU";
			else if (i == rx_ring->next_to_clean)
				next_desc = " NTC";
			else
				next_desc = "";

			if (staterr & E1000_RXD_STAT_DD) {
				/* Descriptor Done */
				pr_info("%s[0x%03X]     %016llX %016llX ---------------- %p%s\n",
					"RWB", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					buffer_info->skb, next_desc);
			} else {
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %p%s\n",
					"R  ", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)buffer_info->dma,
					buffer_info->skb, next_desc);

				if (netif_msg_pktdata(adapter) &&
				    buffer_info->skb)
					print_hex_dump(KERN_INFO, "",
						       DUMP_PREFIX_ADDRESS, 16,
						       1,
						       buffer_info->skb->data,
						       adapter->rx_buffer_len,
						       true);
			}
		}
	}
}

/**
 * e1000_desc_unused - calculate if we have unused descriptors
 **/
static int e1000_desc_unused(struct e1000_ring *ring)
{
	if (ring->next_to_clean > ring->next_to_use)
		return ring->next_to_clean - ring->next_to_use - 1;

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

/**
 * e1000e_systim_to_hwtstamp - convert system time value to hw time stamp
 * @adapter: board private structure
 * @hwtstamps: time stamp structure to update
 * @systim: unsigned 64bit system time value.
 *
 * Convert the system time value stored in the RX/TXSTMP registers into a
 * hwtstamp which can be used by the upper level time stamping functions.
 *
 * The 'systim_lock' spinlock is used to protect the consistency of the
 * system time value. This is needed because reading the 64 bit time
 * value involves reading two 32 bit registers. The first read latches the
 * value.
 **/
static void e1000e_systim_to_hwtstamp(struct e1000_adapter *adapter,
				      struct skb_shared_hwtstamps *hwtstamps,
				      u64 systim)
{
	u64 ns;
	unsigned long flags;

	spin_lock_irqsave(&adapter->systim_lock, flags);
	ns = timecounter_cyc2time(&adapter->tc, systim);
	spin_unlock_irqrestore(&adapter->systim_lock, flags);

	memset(hwtstamps, 0, sizeof(*hwtstamps));
	hwtstamps->hwtstamp = ns_to_ktime(ns);
}

/**
 * e1000e_rx_hwtstamp - utility function which checks for Rx time stamp
 * @adapter: board private structure
 * @status: descriptor extended error and status field
 * @skb: particular skb to include time stamp
 *
 * If the time stamp is valid, convert it into the timecounter ns value
 * and store that result into the shhwtstamps structure which is passed
 * up the network stack.
 **/
static void e1000e_rx_hwtstamp(struct e1000_adapter *adapter, u32 status,
			       struct sk_buff *skb)
{
	struct e1000_hw *hw = &adapter->hw;
	u64 rxstmp;

	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP) ||
	    !(status & E1000_RXDEXT_STATERR_TST) ||
	    !(er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
		return;

	/* The Rx time stamp registers contain the time stamp.  No other
	 * received packet will be time stamped until the Rx time stamp
	 * registers are read.  Because only one packet can be time stamped
	 * at a time, the register values must belong to this packet and
	 * therefore none of the other additional attributes need to be
	 * compared.
	 */
	rxstmp = (u64)er32(RXSTMPL);
	rxstmp |= (u64)er32(RXSTMPH) << 32;
	e1000e_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), rxstmp);

	adapter->flags2 &= ~FLAG2_CHECK_RX_HWTSTAMP;
}

/**
 * e1000_receive_skb - helper function to handle Rx indications
 * @adapter: board private structure
 * @staterr: descriptor extended error and status field as written by hardware
 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 * @skb: pointer to sk_buff to be indicated to stack
 **/
static void e1000_receive_skb(struct e1000_adapter *adapter,
			      struct net_device *netdev, struct sk_buff *skb,
			      u32 staterr, __le16 vlan)
{
	u16 tag = le16_to_cpu(vlan);

	e1000e_rx_hwtstamp(adapter, staterr, skb);

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

	if (staterr & E1000_RXD_STAT_VP)
		__vlan_hwaccel_put_tag(skb, tag);

	napi_gro_receive(&adapter->napi, skb);
}

/**
 * e1000_rx_checksum - Receive Checksum Offload
 * @adapter: board private structure
 * @status_err: receive descriptor status and error fields
 * @csum: receive descriptor csum field
 * @sk_buff: socket buffer with received data
 **/
static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
			      struct sk_buff *skb)
{
	u16 status = (u16)status_err;
	u8 errors = (u8)(status_err >> 24);

	skb_checksum_none_assert(skb);

	/* Rx checksum disabled */
	if (!(adapter->netdev->features & NETIF_F_RXCSUM))
		return;

	/* Ignore Checksum bit is set */
	if (status & E1000_RXD_STAT_IXSM)
		return;

	/* TCP/UDP checksum error bit or IP checksum error bit is set */
	if (errors & (E1000_RXD_ERR_TCPE | E1000_RXD_ERR_IPE)) {
		/* let the stack verify checksum errors */
		adapter->hw_csum_err++;
		return;
	}

	/* TCP/UDP Checksum has not been calculated */
	if (!(status & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS)))
		return;

	/* It must be a TCP or UDP packet with a valid checksum */
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	adapter->hw_csum_good++;
}

static void e1000e_update_rdt_wa(struct e1000_ring *rx_ring, unsigned int i)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct e1000_hw *hw = &adapter->hw;
	s32 ret_val = __ew32_prepare(hw);

	writel(i, rx_ring->tail);

	if (unlikely(!ret_val && (i != readl(rx_ring->tail)))) {
		u32 rctl = er32(RCTL);
		ew32(RCTL, rctl & ~E1000_RCTL_EN);
		e_err("ME firmware caused invalid RDT - resetting\n");
		schedule_work(&adapter->reset_task);
	}
}

static void e1000e_update_tdt_wa(struct e1000_ring *tx_ring, unsigned int i)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct e1000_hw *hw = &adapter->hw;
	s32 ret_val = __ew32_prepare(hw);

	writel(i, tx_ring->tail);

	if (unlikely(!ret_val && (i != readl(tx_ring->tail)))) {
		u32 tctl = er32(TCTL);
		ew32(TCTL, tctl & ~E1000_TCTL_EN);
		e_err("ME firmware caused invalid TDT - resetting\n");
		schedule_work(&adapter->reset_task);
	}
}

/**
 * e1000_alloc_rx_buffers - Replace used receive buffers
 * @rx_ring: Rx descriptor ring
 **/
static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,
				   int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_extended *rx_desc;
	struct e1000_buffer *buffer_info;
	struct sk_buff *skb;
	unsigned int i;
	unsigned int bufsz = adapter->rx_buffer_len;

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		skb = buffer_info->skb;
		if (skb) {
			skb_trim(skb, 0);
			goto map_skb;
		}

		skb = __netdev_alloc_skb_ip_align(netdev, bufsz, gfp);
		if (!skb) {
			/* Better luck next round */
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
map_skb:
		buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
						  adapter->rx_buffer_len,
						  DMA_FROM_DEVICE);
		if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
			dev_err(&pdev->dev, "Rx DMA map failed\n");
			adapter->rx_dma_failed++;
			break;
		}

		rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
		rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);

		if (unlikely(!(i & (E1000_RX_BUFFER_WRITE - 1)))) {
			/* Force memory writes to complete before letting h/w
			 * know there are new descriptors to fetch.  (Only
			 * applicable for weak-ordered memory model archs,
			 * such as IA-64).
			 */
			wmb();
			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
				e1000e_update_rdt_wa(rx_ring, i);
			else
				writel(i, rx_ring->tail);
		}
		i++;
		if (i == rx_ring->count)
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

	rx_ring->next_to_use = i;
}

/**
 * e1000_alloc_rx_buffers_ps - Replace used receive buffers; packet split
 * @rx_ring: Rx descriptor ring
 **/
static void e1000_alloc_rx_buffers_ps(struct e1000_ring *rx_ring,
				      int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_packet_split *rx_desc;
	struct e1000_buffer *buffer_info;
	struct e1000_ps_page *ps_page;
	struct sk_buff *skb;
	unsigned int i, j;

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		rx_desc = E1000_RX_DESC_PS(*rx_ring, i);

		for (j = 0; j < PS_PAGE_BUFFERS; j++) {
			ps_page = &buffer_info->ps_pages[j];
			if (j >= adapter->rx_ps_pages) {
				/* all unused desc entries get hw null ptr */
				rx_desc->read.buffer_addr[j + 1] =
				    ~cpu_to_le64(0);
				continue;
			}
			if (!ps_page->page) {
				ps_page->page = alloc_page(gfp);
				if (!ps_page->page) {
					adapter->alloc_rx_buff_failed++;
					goto no_buffers;
				}
				ps_page->dma = dma_map_page(&pdev->dev,
							    ps_page->page,
							    0, PAGE_SIZE,
							    DMA_FROM_DEVICE);
				if (dma_mapping_error(&pdev->dev,
						      ps_page->dma)) {
					dev_err(&adapter->pdev->dev,
						"Rx DMA page map failed\n");
					adapter->rx_dma_failed++;
					goto no_buffers;
				}
			}
			/* Refresh the desc even if buffer_addrs
			 * didn't change because each write-back
			 * erases this info.
			 */
			rx_desc->read.buffer_addr[j + 1] =
			    cpu_to_le64(ps_page->dma);
		}

		skb = __netdev_alloc_skb_ip_align(netdev,
						  adapter->rx_ps_bsize0,
						  gfp);

		if (!skb) {
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
		buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
						  adapter->rx_ps_bsize0,
						  DMA_FROM_DEVICE);
		if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
			dev_err(&pdev->dev, "Rx DMA map failed\n");
			adapter->rx_dma_failed++;
			/* cleanup skb */
			dev_kfree_skb_any(skb);
			buffer_info->skb = NULL;
			break;
		}

		rx_desc->read.buffer_addr[0] = cpu_to_le64(buffer_info->dma);

		if (unlikely(!(i & (E1000_RX_BUFFER_WRITE - 1)))) {
			/* Force memory writes to complete before letting h/w
			 * know there are new descriptors to fetch.  (Only
			 * applicable for weak-ordered memory model archs,
			 * such as IA-64).
			 */
			wmb();
			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
				e1000e_update_rdt_wa(rx_ring, i << 1);
			else
				writel(i << 1, rx_ring->tail);
		}

		i++;
		if (i == rx_ring->count)
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

no_buffers:
	rx_ring->next_to_use = i;
}

/**
 * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
 * @rx_ring: Rx descriptor ring
 * @cleaned_count: number of buffers to allocate this pass
 **/

static void e1000_alloc_jumbo_rx_buffers(struct e1000_ring *rx_ring,
					 int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_extended *rx_desc;
	struct e1000_buffer *buffer_info;
	struct sk_buff *skb;
	unsigned int i;
	unsigned int bufsz = 256 - 16;	/* for skb_reserve */

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		skb = buffer_info->skb;
		if (skb) {
			skb_trim(skb, 0);
			goto check_page;
		}

		skb = __netdev_alloc_skb_ip_align(netdev, bufsz, gfp);
		if (unlikely(!skb)) {
			/* Better luck next round */
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
check_page:
		/* allocate a new page if necessary */
		if (!buffer_info->page) {
			buffer_info->page = alloc_page(gfp);
			if (unlikely(!buffer_info->page)) {
				adapter->alloc_rx_buff_failed++;
				break;
			}
		}

		if (!buffer_info->dma)
			buffer_info->dma = dma_map_page(&pdev->dev,
							buffer_info->page, 0,
							PAGE_SIZE,
							DMA_FROM_DEVICE);

		rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
		rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);

		if (unlikely(++i == rx_ring->count))
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

	if (likely(rx_ring->next_to_use != i)) {
		rx_ring->next_to_use = i;
		if (unlikely(i-- == 0))
			i = (rx_ring->count - 1);

		/* Force memory writes to complete before letting h/w
		 * know there are new descriptors to fetch.  (Only
		 * applicable for weak-ordered memory model archs,
		 * such as IA-64).
		 */
		wmb();
		if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
			e1000e_update_rdt_wa(rx_ring, i);
		else
			writel(i, rx_ring->tail);
	}
}

static inline void e1000_rx_hash(struct net_device *netdev, __le32 rss,
				 struct sk_buff *skb)
{
	if (netdev->features & NETIF_F_RXHASH)
		skb->rxhash = le32_to_cpu(rss);
}

/**
 * e1000_clean_rx_irq - Send received data up the network stack
 * @rx_ring: Rx descriptor ring
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,
			       int work_to_do)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	struct e1000_hw *hw = &adapter->hw;
	union e1000_rx_desc_extended *rx_desc, *next_rxd;
	struct e1000_buffer *buffer_info, *next_buffer;
	u32 length, staterr;
	unsigned int i;
	int cleaned_count = 0;
	bool cleaned = false;
	unsigned int total_rx_bytes = 0, total_rx_packets = 0;

	i = rx_ring->next_to_clean;
	rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
	staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
	buffer_info = &rx_ring->buffer_info[i];

	while (staterr & E1000_RXD_STAT_DD) {
		struct sk_buff *skb;

		if (*work_done >= work_to_do)
			break;
		(*work_done)++;
		rmb();	/* read descriptor and rx_buffer_info after status DD */

		skb = buffer_info->skb;
		buffer_info->skb = NULL;

		prefetch(skb->data - NET_IP_ALIGN);

		i++;
		if (i == rx_ring->count)
			i = 0;
		next_rxd = E1000_RX_DESC_EXT(*rx_ring, i);
		prefetch(next_rxd);

		next_buffer = &rx_ring->buffer_info[i];

		cleaned = true;
		cleaned_count++;
		dma_unmap_single(&pdev->dev,
				 buffer_info->dma,
				 adapter->rx_buffer_len,
				 DMA_FROM_DEVICE);
		buffer_info->dma = 0;

		length = le16_to_cpu(rx_desc->wb.upper.length);

		/* !EOP means multiple descriptors were used to store a single
		 * packet, if that's the case we need to toss it.  In fact, we
		 * need to toss every packet with the EOP bit clear and the
		 * next frame that _does_ have the EOP bit set, as it is by
		 * definition only a frame fragment
		 */
		if (unlikely(!(staterr & E1000_RXD_STAT_EOP)))
			adapter->flags2 |= FLAG2_IS_DISCARDING;

		if (adapter->flags2 & FLAG2_IS_DISCARDING) {
			/* All receives must fit into a single buffer */
			e_dbg("Receive packet consumed multiple buffers\n");
			/* recycle */
			buffer_info->skb = skb;
			if (staterr & E1000_RXD_STAT_EOP)
				adapter->flags2 &= ~FLAG2_IS_DISCARDING;
			goto next_desc;
		}

		if (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&
			     !(netdev->features & NETIF_F_RXALL))) {
			/* recycle */
			buffer_info->skb = skb;
			goto next_desc;
		}

		/* adjust length to remove Ethernet CRC */
		if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) {
			/* If configured to store CRC, don't subtract FCS,
			 * but keep the FCS bytes out of the total_rx_bytes
			 * counter
			 */
			if (netdev->features & NETIF_F_RXFCS)
				total_rx_bytes -= 4;
			else
				length -= 4;
		}

		total_rx_bytes += length;
		total_rx_packets++;

		/* code added for copybreak, this should improve
		 * performance for small packets with large amounts
		 * of reassembly being done in the stack
		 */
		if (length < copybreak) {
			struct sk_buff *new_skb =
			    netdev_alloc_skb_ip_align(netdev, length);
			if (new_skb) {
				skb_copy_to_linear_data_offset(new_skb,
							       -NET_IP_ALIGN,
							       (skb->data -
								NET_IP_ALIGN),