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

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     3

  Intel PRO/1000 Linux driver

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  Copyright(c) 1999 - 2006 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.

     9

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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

    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

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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.

    18

    19

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

    20

  the file called "COPYING".

    21

    22

  Contact Information:

    23

  Linux NICS <linux.nics@intel.com>

    24

  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

    25

  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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    27

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

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#include "e1000.h"

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#include <net/ip6_checksum.h>

    31

    32

char e1000_driver_name[] = "e1000";

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static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";

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#ifndef CONFIG_E1000_NAPI

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#define DRIVERNAPI

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#else

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#define DRIVERNAPI "-NAPI"

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#endif

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#define DRV_VERSION "7.3.20-k2"DRIVERNAPI

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char e1000_driver_version[] = DRV_VERSION;

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static char e1000_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";

    42

    43

/* e1000_pci_tbl - PCI Device ID Table

    44

 *

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 * Last entry must be all 0s

    46

 *

    47

 * Macro expands to...

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 *   {PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}

    49

 */

    50

static struct pci_device_id e1000_pci_tbl[] = {

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	INTEL_E1000_ETHERNET_DEVICE(0x1000),

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	INTEL_E1000_ETHERNET_DEVICE(0x1001),

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	INTEL_E1000_ETHERNET_DEVICE(0x1004),

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	INTEL_E1000_ETHERNET_DEVICE(0x1008),

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	INTEL_E1000_ETHERNET_DEVICE(0x1009),

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	INTEL_E1000_ETHERNET_DEVICE(0x100C),

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	INTEL_E1000_ETHERNET_DEVICE(0x100D),

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	INTEL_E1000_ETHERNET_DEVICE(0x100E),

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	INTEL_E1000_ETHERNET_DEVICE(0x100F),

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	INTEL_E1000_ETHERNET_DEVICE(0x1010),

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	INTEL_E1000_ETHERNET_DEVICE(0x1011),

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	INTEL_E1000_ETHERNET_DEVICE(0x1012),

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	INTEL_E1000_ETHERNET_DEVICE(0x1013),

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	INTEL_E1000_ETHERNET_DEVICE(0x1014),

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	INTEL_E1000_ETHERNET_DEVICE(0x1015),

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	INTEL_E1000_ETHERNET_DEVICE(0x1016),

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	INTEL_E1000_ETHERNET_DEVICE(0x1017),

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	INTEL_E1000_ETHERNET_DEVICE(0x1018),

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	INTEL_E1000_ETHERNET_DEVICE(0x1019),

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	INTEL_E1000_ETHERNET_DEVICE(0x101A),

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	INTEL_E1000_ETHERNET_DEVICE(0x101D),

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	INTEL_E1000_ETHERNET_DEVICE(0x101E),

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	INTEL_E1000_ETHERNET_DEVICE(0x1026),

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	INTEL_E1000_ETHERNET_DEVICE(0x1027),

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	INTEL_E1000_ETHERNET_DEVICE(0x1028),

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	INTEL_E1000_ETHERNET_DEVICE(0x1049),

    77

	INTEL_E1000_ETHERNET_DEVICE(0x104A),

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	INTEL_E1000_ETHERNET_DEVICE(0x104B),

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	INTEL_E1000_ETHERNET_DEVICE(0x104C),

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	INTEL_E1000_ETHERNET_DEVICE(0x104D),

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	INTEL_E1000_ETHERNET_DEVICE(0x105E),

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	INTEL_E1000_ETHERNET_DEVICE(0x105F),

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	INTEL_E1000_ETHERNET_DEVICE(0x1060),

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	INTEL_E1000_ETHERNET_DEVICE(0x1075),

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	INTEL_E1000_ETHERNET_DEVICE(0x1076),

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	INTEL_E1000_ETHERNET_DEVICE(0x1077),

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	INTEL_E1000_ETHERNET_DEVICE(0x1078),

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	INTEL_E1000_ETHERNET_DEVICE(0x1079),

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	INTEL_E1000_ETHERNET_DEVICE(0x107A),

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	INTEL_E1000_ETHERNET_DEVICE(0x107B),

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	INTEL_E1000_ETHERNET_DEVICE(0x107C),

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	INTEL_E1000_ETHERNET_DEVICE(0x107D),

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	INTEL_E1000_ETHERNET_DEVICE(0x107E),

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	INTEL_E1000_ETHERNET_DEVICE(0x107F),

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	INTEL_E1000_ETHERNET_DEVICE(0x108A),

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	INTEL_E1000_ETHERNET_DEVICE(0x108B),

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	INTEL_E1000_ETHERNET_DEVICE(0x108C),

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	INTEL_E1000_ETHERNET_DEVICE(0x1096),

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	INTEL_E1000_ETHERNET_DEVICE(0x1098),

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	INTEL_E1000_ETHERNET_DEVICE(0x1099),

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	INTEL_E1000_ETHERNET_DEVICE(0x109A),

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	INTEL_E1000_ETHERNET_DEVICE(0x10A4),

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	INTEL_E1000_ETHERNET_DEVICE(0x10B5),

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	INTEL_E1000_ETHERNET_DEVICE(0x10B9),

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	INTEL_E1000_ETHERNET_DEVICE(0x10BA),

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	INTEL_E1000_ETHERNET_DEVICE(0x10BB),

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	INTEL_E1000_ETHERNET_DEVICE(0x10BC),

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	INTEL_E1000_ETHERNET_DEVICE(0x10C4),

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	INTEL_E1000_ETHERNET_DEVICE(0x10C5),

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	/* required last entry */

   111

	{0,}

   112

};

   113

   114

MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);

   115

   116

int e1000_up(struct e1000_adapter *adapter);

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void e1000_down(struct e1000_adapter *adapter);

   118

void e1000_reinit_locked(struct e1000_adapter *adapter);

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void e1000_reset(struct e1000_adapter *adapter);

   120

int e1000_set_spd_dplx(struct e1000_adapter *adapter, uint16_t spddplx);

   121

int e1000_setup_all_tx_resources(struct e1000_adapter *adapter);

   122

int e1000_setup_all_rx_resources(struct e1000_adapter *adapter);

   123

void e1000_free_all_tx_resources(struct e1000_adapter *adapter);

   124

void e1000_free_all_rx_resources(struct e1000_adapter *adapter);

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static int e1000_setup_tx_resources(struct e1000_adapter *adapter,

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                             struct e1000_tx_ring *txdr);

   127

static int e1000_setup_rx_resources(struct e1000_adapter *adapter,

   128

                             struct e1000_rx_ring *rxdr);

   129

static void e1000_free_tx_resources(struct e1000_adapter *adapter,

   130

                             struct e1000_tx_ring *tx_ring);

   131

static void e1000_free_rx_resources(struct e1000_adapter *adapter,

   132

                             struct e1000_rx_ring *rx_ring);

   133

void e1000_update_stats(struct e1000_adapter *adapter);

   134

   135

static int e1000_init_module(void);

   136

static void e1000_exit_module(void);

   137

static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent);

   138

static void __devexit e1000_remove(struct pci_dev *pdev);

   139

static int e1000_alloc_queues(struct e1000_adapter *adapter);

   140

static int e1000_sw_init(struct e1000_adapter *adapter);

   141

static int e1000_open(struct net_device *netdev);

   142

static int e1000_close(struct net_device *netdev);

   143

static void e1000_configure_tx(struct e1000_adapter *adapter);

   144

static void e1000_configure_rx(struct e1000_adapter *adapter);

   145

static void e1000_setup_rctl(struct e1000_adapter *adapter);

   146

static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter);

   147

static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter);

   148

static void e1000_clean_tx_ring(struct e1000_adapter *adapter,

   149

                                struct e1000_tx_ring *tx_ring);

   150

static void e1000_clean_rx_ring(struct e1000_adapter *adapter,

   151

                                struct e1000_rx_ring *rx_ring);

   152

static void e1000_set_multi(struct net_device *netdev);

   153

static void e1000_update_phy_info(unsigned long data);

   154

static void e1000_watchdog(unsigned long data);

   155

static void e1000_82547_tx_fifo_stall(unsigned long data);

   156

static int e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev);

   157

static struct net_device_stats * e1000_get_stats(struct net_device *netdev);

   158

static int e1000_change_mtu(struct net_device *netdev, int new_mtu);

   159

static int e1000_set_mac(struct net_device *netdev, void *p);

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static irqreturn_t e1000_intr(int irq, void *data);

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static irqreturn_t e1000_intr_msi(int irq, void *data);

   162

static boolean_t e1000_clean_tx_irq(struct e1000_adapter *adapter,

   163

                                    struct e1000_tx_ring *tx_ring);

   164

#ifdef CONFIG_E1000_NAPI

   165

static int e1000_clean(struct net_device *poll_dev, int *budget);

   166

static boolean_t e1000_clean_rx_irq(struct e1000_adapter *adapter,

   167

                                    struct e1000_rx_ring *rx_ring,

   168

                                    int *work_done, int work_to_do);

   169

static boolean_t e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,

   170

                                       struct e1000_rx_ring *rx_ring,

   171

                                       int *work_done, int work_to_do);

   172

#else

   173

static boolean_t e1000_clean_rx_irq(struct e1000_adapter *adapter,

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                                    struct e1000_rx_ring *rx_ring);

   175

static boolean_t e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,

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                                       struct e1000_rx_ring *rx_ring);

   177

#endif

   178

static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,

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                                   struct e1000_rx_ring *rx_ring,

   180

				   int cleaned_count);

   181

static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,

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                                      struct e1000_rx_ring *rx_ring,

   183

				      int cleaned_count);

   184

static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);

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static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,

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			   int cmd);

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void e1000_set_ethtool_ops(struct net_device *netdev);

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static void e1000_enter_82542_rst(struct e1000_adapter *adapter);

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static void e1000_leave_82542_rst(struct e1000_adapter *adapter);

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static void e1000_tx_timeout(struct net_device *dev);

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static void e1000_reset_task(struct work_struct *work);

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static void e1000_smartspeed(struct e1000_adapter *adapter);

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static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,

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                                       struct sk_buff *skb);

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   196

static void e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp);

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static void e1000_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);

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static void e1000_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);

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static void e1000_restore_vlan(struct e1000_adapter *adapter);

   200

   201

static int e1000_suspend(struct pci_dev *pdev, pm_message_t state);

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#ifdef CONFIG_PM

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static int e1000_resume(struct pci_dev *pdev);

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#endif

   205

static void e1000_shutdown(struct pci_dev *pdev);

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   207

#ifdef CONFIG_NET_POLL_CONTROLLER

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/* for netdump / net console */

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static void e1000_netpoll (struct net_device *netdev);

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#endif

   211

   212

extern void e1000_check_options(struct e1000_adapter *adapter);

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   214

#define COPYBREAK_DEFAULT 256

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static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;

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module_param(copybreak, uint, 0644);

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MODULE_PARM_DESC(copybreak,

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	"Maximum size of packet that is copied to a new buffer on receive");

   219

   220

static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,

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                     pci_channel_state_t state);

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static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);

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static void e1000_io_resume(struct pci_dev *pdev);

   224

   225

static struct pci_error_handlers e1000_err_handler = {

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	.error_detected = e1000_io_error_detected,

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	.slot_reset = e1000_io_slot_reset,

   228

	.resume = e1000_io_resume,

   229

};

   230

   231

static struct pci_driver e1000_driver = {

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	.name     = e1000_driver_name,

   233

	.id_table = e1000_pci_tbl,

   234

	.probe    = e1000_probe,

   235

	.remove   = __devexit_p(e1000_remove),

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#ifdef CONFIG_PM

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	/* Power Managment Hooks */

   238

	.suspend  = e1000_suspend,

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	.resume   = e1000_resume,

   240

#endif

   241

	.shutdown = e1000_shutdown,

   242

	.err_handler = &e1000_err_handler

   243

};

   244

   245

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");

   246

MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");

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MODULE_LICENSE("GPL");

   248

MODULE_VERSION(DRV_VERSION);

   249

   250

static int debug = NETIF_MSG_DRV | NETIF_MSG_PROBE;

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module_param(debug, int, 0);

   252

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

   253

   254

/**

   255

 * e1000_init_module - Driver Registration Routine

   256

 *

   257

 * e1000_init_module is the first routine called when the driver is

   258

 * loaded. All it does is register with the PCI subsystem.

   259

 **/

   260

   261

static int __init

   262

e1000_init_module(void)

   263

{

   264

	int ret;

   265

	printk(KERN_INFO "%s - version %s\n",

   266

	       e1000_driver_string, e1000_driver_version);

   267

   268

	printk(KERN_INFO "%s\n", e1000_copyright);

   269

   270

	ret = pci_register_driver(&e1000_driver);

   271

	if (copybreak != COPYBREAK_DEFAULT) {

   272

		if (copybreak == 0)

   273

			printk(KERN_INFO "e1000: copybreak disabled\n");

   274

		else

   275

			printk(KERN_INFO "e1000: copybreak enabled for "

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			       "packets <= %u bytes\n", copybreak);

   277

	}

   278

	return ret;

   279

}

   280

   281

module_init(e1000_init_module);

   282

   283

/**

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 * e1000_exit_module - Driver Exit Cleanup Routine

   285

 *

   286

 * e1000_exit_module is called just before the driver is removed

   287

 * from memory.

   288

 **/

   289

   290

static void __exit

   291

e1000_exit_module(void)

   292

{

   293

	pci_unregister_driver(&e1000_driver);

   294

}

   295

   296

module_exit(e1000_exit_module);

   297

   298

static int e1000_request_irq(struct e1000_adapter *adapter)

   299

{

   300

	struct net_device *netdev = adapter->netdev;

   301

	void (*handler) = &e1000_intr;

   302

	int irq_flags = IRQF_SHARED;

   303

	int err;

   304

   305

	if (adapter->hw.mac_type >= e1000_82571) {

   306

		adapter->have_msi = !pci_enable_msi(adapter->pdev);

   307

		if (adapter->have_msi) {

   308

			handler = &e1000_intr_msi;

   309

			irq_flags = 0;

   310

		}

   311

	}

   312

   313

	err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,

   314

	                  netdev);

   315

	if (err) {

   316

		if (adapter->have_msi)

   317

			pci_disable_msi(adapter->pdev);

   318

		DPRINTK(PROBE, ERR,

   319

		        "Unable to allocate interrupt Error: %d\n", err);

   320

	}

   321

   322

	return err;

   323

}

   324

   325

static void e1000_free_irq(struct e1000_adapter *adapter)

   326

{

   327

	struct net_device *netdev = adapter->netdev;

   328

   329

	free_irq(adapter->pdev->irq, netdev);

   330

   331

	if (adapter->have_msi)

   332

		pci_disable_msi(adapter->pdev);

   333

}

   334

   335

/**

   336

 * e1000_irq_disable - Mask off interrupt generation on the NIC

   337

 * @adapter: board private structure

   338

 **/

   339

   340

static void

   341

e1000_irq_disable(struct e1000_adapter *adapter)

   342

{

   343

	atomic_inc(&adapter->irq_sem);

   344

	E1000_WRITE_REG(&adapter->hw, IMC, ~0);

   345

	E1000_WRITE_FLUSH(&adapter->hw);

   346

	synchronize_irq(adapter->pdev->irq);

   347

}

   348

   349

/**

   350

 * e1000_irq_enable - Enable default interrupt generation settings

   351

 * @adapter: board private structure

   352

 **/

   353

   354

static void

   355

e1000_irq_enable(struct e1000_adapter *adapter)

   356

{

   357

	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {

   358

		E1000_WRITE_REG(&adapter->hw, IMS, IMS_ENABLE_MASK);

   359

		E1000_WRITE_FLUSH(&adapter->hw);

   360

	}

   361

}

   362

   363

static void

   364

e1000_update_mng_vlan(struct e1000_adapter *adapter)

   365

{

   366

	struct net_device *netdev = adapter->netdev;

   367

	uint16_t vid = adapter->hw.mng_cookie.vlan_id;

   368

	uint16_t old_vid = adapter->mng_vlan_id;

   369

	if (adapter->vlgrp) {

   370

		if (!vlan_group_get_device(adapter->vlgrp, vid)) {

   371

			if (adapter->hw.mng_cookie.status &

   372

				E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {

   373

				e1000_vlan_rx_add_vid(netdev, vid);

   374

				adapter->mng_vlan_id = vid;

   375

			} else

   376

				adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;

   377

   378

			if ((old_vid != (uint16_t)E1000_MNG_VLAN_NONE) &&

   379

					(vid != old_vid) &&

   380

			    !vlan_group_get_device(adapter->vlgrp, old_vid))

   381

				e1000_vlan_rx_kill_vid(netdev, old_vid);

   382

		} else

   383

			adapter->mng_vlan_id = vid;

   384

	}

   385

}

   386

   387

/**

   388

 * e1000_release_hw_control - release control of the h/w to f/w

   389

 * @adapter: address of board private structure

   390

 *

   391

 * e1000_release_hw_control resets {CTRL_EXT|FWSM}:DRV_LOAD bit.

   392

 * For ASF and Pass Through versions of f/w this means that the

   393

 * driver is no longer loaded. For AMT version (only with 82573) i

   394

 * of the f/w this means that the network i/f is closed.

   395

 *

   396

 **/

   397

   398

static void

   399

e1000_release_hw_control(struct e1000_adapter *adapter)

   400

{

   401

	uint32_t ctrl_ext;

   402

	uint32_t swsm;

   403

   404

	/* Let firmware taken over control of h/w */

   405

	switch (adapter->hw.mac_type) {

   406

	case e1000_82573:

   407

		swsm = E1000_READ_REG(&adapter->hw, SWSM);

   408

		E1000_WRITE_REG(&adapter->hw, SWSM,

   409

				swsm & ~E1000_SWSM_DRV_LOAD);

   410

		break;

   411

	case e1000_82571:

   412

	case e1000_82572:

   413

	case e1000_80003es2lan:

   414

	case e1000_ich8lan:

   415

		ctrl_ext = E1000_READ_REG(&adapter->hw, CTRL_EXT);

   416

		E1000_WRITE_REG(&adapter->hw, CTRL_EXT,

   417

				ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);

   418

		break;

   419

	default:

   420

		break;

   421

	}

   422

}

   423

   424

/**

   425

 * e1000_get_hw_control - get control of the h/w from f/w

   426

 * @adapter: address of board private structure

   427

 *

   428

 * e1000_get_hw_control sets {CTRL_EXT|FWSM}:DRV_LOAD bit.

   429

 * For ASF and Pass Through versions of f/w this means that

   430

 * the driver is loaded. For AMT version (only with 82573)

   431

 * of the f/w this means that the network i/f is open.

   432

 *

   433

 **/

   434

   435

static void

   436

e1000_get_hw_control(struct e1000_adapter *adapter)

   437

{

   438

	uint32_t ctrl_ext;

   439

	uint32_t swsm;

   440

   441

	/* Let firmware know the driver has taken over */

   442

	switch (adapter->hw.mac_type) {

   443

	case e1000_82573:

   444

		swsm = E1000_READ_REG(&adapter->hw, SWSM);

   445

		E1000_WRITE_REG(&adapter->hw, SWSM,

   446

				swsm | E1000_SWSM_DRV_LOAD);

   447

		break;

   448

	case e1000_82571:

   449

	case e1000_82572:

   450

	case e1000_80003es2lan:

   451

	case e1000_ich8lan:

   452

		ctrl_ext = E1000_READ_REG(&adapter->hw, CTRL_EXT);

   453

		E1000_WRITE_REG(&adapter->hw, CTRL_EXT,

   454

				ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);

   455

		break;

   456

	default:

   457

		break;

   458

	}

   459

}

   460

   461

static void

   462

e1000_init_manageability(struct e1000_adapter *adapter)

   463

{

   464

	if (adapter->en_mng_pt) {

   465

		uint32_t manc = E1000_READ_REG(&adapter->hw, MANC);

   466

   467

		/* disable hardware interception of ARP */

   468

		manc &= ~(E1000_MANC_ARP_EN);

   469

   470

		/* enable receiving management packets to the host */

   471

		/* this will probably generate destination unreachable messages

   472

		 * from the host OS, but the packets will be handled on SMBUS */

   473

		if (adapter->hw.has_manc2h) {

   474

			uint32_t manc2h = E1000_READ_REG(&adapter->hw, MANC2H);

   475

   476

			manc |= E1000_MANC_EN_MNG2HOST;

   477

#define E1000_MNG2HOST_PORT_623 (1 << 5)

   478

#define E1000_MNG2HOST_PORT_664 (1 << 6)

   479

			manc2h |= E1000_MNG2HOST_PORT_623;

   480

			manc2h |= E1000_MNG2HOST_PORT_664;

   481

			E1000_WRITE_REG(&adapter->hw, MANC2H, manc2h);

   482

		}

   483

   484

		E1000_WRITE_REG(&adapter->hw, MANC, manc);

   485

	}

   486

}

   487

   488

static void

   489

e1000_release_manageability(struct e1000_adapter *adapter)

   490

{

   491

	if (adapter->en_mng_pt) {

   492

		uint32_t manc = E1000_READ_REG(&adapter->hw, MANC);

   493

   494

		/* re-enable hardware interception of ARP */

   495

		manc |= E1000_MANC_ARP_EN;

   496

   497

		if (adapter->hw.has_manc2h)

   498

			manc &= ~E1000_MANC_EN_MNG2HOST;

   499

   500

		/* don't explicitly have to mess with MANC2H since

   501

		 * MANC has an enable disable that gates MANC2H */

   502

   503

		E1000_WRITE_REG(&adapter->hw, MANC, manc);

   504

	}

   505

}

   506

   507

/**

   508

 * e1000_configure - configure the hardware for RX and TX

   509

 * @adapter = private board structure

   510

 **/

   511

static void e1000_configure(struct e1000_adapter *adapter)

   512

{

   513

	struct net_device *netdev = adapter->netdev;

   514

	int i;

   515

   516

	e1000_set_multi(netdev);

   517

   518

	e1000_restore_vlan(adapter);

   519

	e1000_init_manageability(adapter);

   520

   521

	e1000_configure_tx(adapter);

   522

	e1000_setup_rctl(adapter);

   523

	e1000_configure_rx(adapter);

   524

	/* call E1000_DESC_UNUSED which always leaves

   525

	 * at least 1 descriptor unused to make sure

   526

	 * next_to_use != next_to_clean */

   527

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

   528

		struct e1000_rx_ring *ring = &adapter->rx_ring[i];

   529

		adapter->alloc_rx_buf(adapter, ring,

   530

		                      E1000_DESC_UNUSED(ring));