Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...
[linux-2.6.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3   
4   Copyright(c) 1999 - 2006 Intel Corporation. All rights reserved.
5   
6   This program is free software; you can redistribute it and/or modify it 
7   under the terms of the GNU General Public License as published by the Free 
8   Software Foundation; either version 2 of the License, or (at your option) 
9   any later version.
10   
11   This program is distributed in the hope that it will be useful, but WITHOUT 
12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
14   more details.
15   
16   You should have received a copy of the GNU General Public License along with
17   this program; if not, write to the Free Software Foundation, Inc., 59 
18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19   
20   The full GNU General Public License is included in this distribution in the
21   file called LICENSE.
22   
23   Contact Information:
24   Linux NICS <linux.nics@intel.com>
25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #ifndef CONFIG_IXGB_NAPI
35 #define DRIVERNAPI
36 #else
37 #define DRIVERNAPI "-NAPI"
38 #endif
39 #define DRV_VERSION             "1.0.112-k2"DRIVERNAPI
40 char ixgb_driver_version[] = DRV_VERSION;
41 static char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
42
43 /* ixgb_pci_tbl - PCI Device ID Table
44  *
45  * Wildcard entries (PCI_ANY_ID) should come last
46  * Last entry must be all 0s
47  *
48  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
49  *   Class, Class Mask, private data (not used) }
50  */
51 static struct pci_device_id ixgb_pci_tbl[] = {
52         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
53          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,  
59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60
61         /* required last entry */
62         {0,}
63 };
64
65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
66
67 /* Local Function Prototypes */
68
69 int ixgb_up(struct ixgb_adapter *adapter);
70 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
71 void ixgb_reset(struct ixgb_adapter *adapter);
72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
76 void ixgb_update_stats(struct ixgb_adapter *adapter);
77
78 static int ixgb_init_module(void);
79 static void ixgb_exit_module(void);
80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
81 static void __devexit ixgb_remove(struct pci_dev *pdev);
82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
83 static int ixgb_open(struct net_device *netdev);
84 static int ixgb_close(struct net_device *netdev);
85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
90 static void ixgb_set_multi(struct net_device *netdev);
91 static void ixgb_watchdog(unsigned long data);
92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
95 static int ixgb_set_mac(struct net_device *netdev, void *p);
96 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
97 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
98
99 #ifdef CONFIG_IXGB_NAPI
100 static int ixgb_clean(struct net_device *netdev, int *budget);
101 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102                                    int *work_done, int work_to_do);
103 #else
104 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 void ixgb_set_ethtool_ops(struct net_device *netdev);
108 static void ixgb_tx_timeout(struct net_device *dev);
109 static void ixgb_tx_timeout_task(struct net_device *dev);
110 static void ixgb_vlan_rx_register(struct net_device *netdev,
111                                   struct vlan_group *grp);
112 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
113 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
114 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
115
116 #ifdef CONFIG_NET_POLL_CONTROLLER
117 /* for netdump / net console */
118 static void ixgb_netpoll(struct net_device *dev);
119 #endif
120
121 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
122                              enum pci_channel_state state);
123 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
124 static void ixgb_io_resume (struct pci_dev *pdev);
125
126 /* Exported from other modules */
127 extern void ixgb_check_options(struct ixgb_adapter *adapter);
128
129 static struct pci_error_handlers ixgb_err_handler = {
130         .error_detected = ixgb_io_error_detected,
131         .slot_reset = ixgb_io_slot_reset,
132         .resume = ixgb_io_resume,
133 };
134
135 static struct pci_driver ixgb_driver = {
136         .name     = ixgb_driver_name,
137         .id_table = ixgb_pci_tbl,
138         .probe    = ixgb_probe,
139         .remove   = __devexit_p(ixgb_remove),
140         .err_handler = &ixgb_err_handler
141 };
142
143 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
144 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
145 MODULE_LICENSE("GPL");
146 MODULE_VERSION(DRV_VERSION);
147
148 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
149 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
150 module_param(debug, int, 0);
151 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
152
153 /* some defines for controlling descriptor fetches in h/w */
154 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
155 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
156                                     * this */
157 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
158                                     * is pushed this many descriptors
159                                     * from head */
160
161 /**
162  * ixgb_init_module - Driver Registration Routine
163  *
164  * ixgb_init_module is the first routine called when the driver is
165  * loaded. All it does is register with the PCI subsystem.
166  **/
167
168 static int __init
169 ixgb_init_module(void)
170 {
171         printk(KERN_INFO "%s - version %s\n",
172                ixgb_driver_string, ixgb_driver_version);
173
174         printk(KERN_INFO "%s\n", ixgb_copyright);
175
176         return pci_register_driver(&ixgb_driver);
177 }
178
179 module_init(ixgb_init_module);
180
181 /**
182  * ixgb_exit_module - Driver Exit Cleanup Routine
183  *
184  * ixgb_exit_module is called just before the driver is removed
185  * from memory.
186  **/
187
188 static void __exit
189 ixgb_exit_module(void)
190 {
191         pci_unregister_driver(&ixgb_driver);
192 }
193
194 module_exit(ixgb_exit_module);
195
196 /**
197  * ixgb_irq_disable - Mask off interrupt generation on the NIC
198  * @adapter: board private structure
199  **/
200
201 static void
202 ixgb_irq_disable(struct ixgb_adapter *adapter)
203 {
204         atomic_inc(&adapter->irq_sem);
205         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
206         IXGB_WRITE_FLUSH(&adapter->hw);
207         synchronize_irq(adapter->pdev->irq);
208 }
209
210 /**
211  * ixgb_irq_enable - Enable default interrupt generation settings
212  * @adapter: board private structure
213  **/
214
215 static void
216 ixgb_irq_enable(struct ixgb_adapter *adapter)
217 {
218         if(atomic_dec_and_test(&adapter->irq_sem)) {
219                 IXGB_WRITE_REG(&adapter->hw, IMS,
220                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
221                                IXGB_INT_LSC);
222                 IXGB_WRITE_FLUSH(&adapter->hw);
223         }
224 }
225
226 int
227 ixgb_up(struct ixgb_adapter *adapter)
228 {
229         struct net_device *netdev = adapter->netdev;
230         int err;
231         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
232         struct ixgb_hw *hw = &adapter->hw;
233
234         /* hardware has been reset, we need to reload some things */
235
236         ixgb_rar_set(hw, netdev->dev_addr, 0);
237         ixgb_set_multi(netdev);
238
239         ixgb_restore_vlan(adapter);
240
241         ixgb_configure_tx(adapter);
242         ixgb_setup_rctl(adapter);
243         ixgb_configure_rx(adapter);
244         ixgb_alloc_rx_buffers(adapter);
245
246         /* disable interrupts and get the hardware into a known state */
247         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
248
249 #ifdef CONFIG_PCI_MSI
250         {
251         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) & 
252                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
253         adapter->have_msi = TRUE;
254
255         if (!pcix)
256            adapter->have_msi = FALSE;
257         else if((err = pci_enable_msi(adapter->pdev))) {
258                 DPRINTK(PROBE, ERR,
259                  "Unable to allocate MSI interrupt Error: %d\n", err);
260                 adapter->have_msi = FALSE;
261                 /* proceed to try to request regular interrupt */
262         }
263         }
264
265 #endif
266         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
267                                   IRQF_SHARED | IRQF_SAMPLE_RANDOM,
268                                   netdev->name, netdev))) {
269                 DPRINTK(PROBE, ERR,
270                  "Unable to allocate interrupt Error: %d\n", err);
271                 return err;
272         }
273
274         if((hw->max_frame_size != max_frame) ||
275                 (hw->max_frame_size !=
276                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
277
278                 hw->max_frame_size = max_frame;
279
280                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
281
282                 if(hw->max_frame_size >
283                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
284                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
285
286                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
287                                 ctrl0 |= IXGB_CTRL0_JFE;
288                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
289                         }
290                 }
291         }
292
293         mod_timer(&adapter->watchdog_timer, jiffies);
294
295 #ifdef CONFIG_IXGB_NAPI
296         netif_poll_enable(netdev);
297 #endif
298         ixgb_irq_enable(adapter);
299
300         return 0;
301 }
302
303 void
304 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
305 {
306         struct net_device *netdev = adapter->netdev;
307
308         ixgb_irq_disable(adapter);
309         free_irq(adapter->pdev->irq, netdev);
310 #ifdef CONFIG_PCI_MSI
311         if(adapter->have_msi == TRUE)
312                 pci_disable_msi(adapter->pdev);
313
314 #endif
315         if(kill_watchdog)
316                 del_timer_sync(&adapter->watchdog_timer);
317 #ifdef CONFIG_IXGB_NAPI
318         netif_poll_disable(netdev);
319 #endif
320         adapter->link_speed = 0;
321         adapter->link_duplex = 0;
322         netif_carrier_off(netdev);
323         netif_stop_queue(netdev);
324
325         ixgb_reset(adapter);
326         ixgb_clean_tx_ring(adapter);
327         ixgb_clean_rx_ring(adapter);
328 }
329
330 void
331 ixgb_reset(struct ixgb_adapter *adapter)
332 {
333
334         ixgb_adapter_stop(&adapter->hw);
335         if(!ixgb_init_hw(&adapter->hw))
336                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
337 }
338
339 /**
340  * ixgb_probe - Device Initialization Routine
341  * @pdev: PCI device information struct
342  * @ent: entry in ixgb_pci_tbl
343  *
344  * Returns 0 on success, negative on failure
345  *
346  * ixgb_probe initializes an adapter identified by a pci_dev structure.
347  * The OS initialization, configuring of the adapter private structure,
348  * and a hardware reset occur.
349  **/
350
351 static int __devinit
352 ixgb_probe(struct pci_dev *pdev,
353                 const struct pci_device_id *ent)
354 {
355         struct net_device *netdev = NULL;
356         struct ixgb_adapter *adapter;
357         static int cards_found = 0;
358         unsigned long mmio_start;
359         int mmio_len;
360         int pci_using_dac;
361         int i;
362         int err;
363
364         if((err = pci_enable_device(pdev)))
365                 return err;
366
367         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
368            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
369                 pci_using_dac = 1;
370         } else {
371                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
372                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
373                         printk(KERN_ERR
374                          "ixgb: No usable DMA configuration, aborting\n");
375                         goto err_dma_mask;
376                 }
377                 pci_using_dac = 0;
378         }
379
380         if((err = pci_request_regions(pdev, ixgb_driver_name)))
381                 goto err_request_regions;
382
383         pci_set_master(pdev);
384
385         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
386         if(!netdev) {
387                 err = -ENOMEM;
388                 goto err_alloc_etherdev;
389         }
390
391         SET_MODULE_OWNER(netdev);
392         SET_NETDEV_DEV(netdev, &pdev->dev);
393
394         pci_set_drvdata(pdev, netdev);
395         adapter = netdev_priv(netdev);
396         adapter->netdev = netdev;
397         adapter->pdev = pdev;
398         adapter->hw.back = adapter;
399         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
400
401         mmio_start = pci_resource_start(pdev, BAR_0);
402         mmio_len = pci_resource_len(pdev, BAR_0);
403
404         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
405         if(!adapter->hw.hw_addr) {
406                 err = -EIO;
407                 goto err_ioremap;
408         }
409
410         for(i = BAR_1; i <= BAR_5; i++) {
411                 if(pci_resource_len(pdev, i) == 0)
412                         continue;
413                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
414                         adapter->hw.io_base = pci_resource_start(pdev, i);
415                         break;
416                 }
417         }
418
419         netdev->open = &ixgb_open;
420         netdev->stop = &ixgb_close;
421         netdev->hard_start_xmit = &ixgb_xmit_frame;
422         netdev->get_stats = &ixgb_get_stats;
423         netdev->set_multicast_list = &ixgb_set_multi;
424         netdev->set_mac_address = &ixgb_set_mac;
425         netdev->change_mtu = &ixgb_change_mtu;
426         ixgb_set_ethtool_ops(netdev);
427         netdev->tx_timeout = &ixgb_tx_timeout;
428         netdev->watchdog_timeo = 5 * HZ;
429 #ifdef CONFIG_IXGB_NAPI
430         netdev->poll = &ixgb_clean;
431         netdev->weight = 64;
432 #endif
433         netdev->vlan_rx_register = ixgb_vlan_rx_register;
434         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
435         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
436 #ifdef CONFIG_NET_POLL_CONTROLLER
437         netdev->poll_controller = ixgb_netpoll;
438 #endif
439
440         strcpy(netdev->name, pci_name(pdev));
441         netdev->mem_start = mmio_start;
442         netdev->mem_end = mmio_start + mmio_len;
443         netdev->base_addr = adapter->hw.io_base;
444
445         adapter->bd_number = cards_found;
446         adapter->link_speed = 0;
447         adapter->link_duplex = 0;
448
449         /* setup the private structure */
450
451         if((err = ixgb_sw_init(adapter)))
452                 goto err_sw_init;
453
454         netdev->features = NETIF_F_SG |
455                            NETIF_F_HW_CSUM |
456                            NETIF_F_HW_VLAN_TX |
457                            NETIF_F_HW_VLAN_RX |
458                            NETIF_F_HW_VLAN_FILTER;
459 #ifdef NETIF_F_TSO
460         netdev->features |= NETIF_F_TSO;
461 #endif
462 #ifdef NETIF_F_LLTX
463         netdev->features |= NETIF_F_LLTX;
464 #endif
465
466         if(pci_using_dac)
467                 netdev->features |= NETIF_F_HIGHDMA;
468
469         /* make sure the EEPROM is good */
470
471         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
472                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
473                 err = -EIO;
474                 goto err_eeprom;
475         }
476
477         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
478         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
479
480         if(!is_valid_ether_addr(netdev->perm_addr)) {
481                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
482                 err = -EIO;
483                 goto err_eeprom;
484         }
485
486         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
487
488         init_timer(&adapter->watchdog_timer);
489         adapter->watchdog_timer.function = &ixgb_watchdog;
490         adapter->watchdog_timer.data = (unsigned long)adapter;
491
492         INIT_WORK(&adapter->tx_timeout_task,
493                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
494
495         strcpy(netdev->name, "eth%d");
496         if((err = register_netdev(netdev)))
497                 goto err_register;
498
499         /* we're going to reset, so assume we have no link for now */
500
501         netif_carrier_off(netdev);
502         netif_stop_queue(netdev);
503
504         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
505         ixgb_check_options(adapter);
506         /* reset the hardware with the new settings */
507
508         ixgb_reset(adapter);
509
510         cards_found++;
511         return 0;
512
513 err_register:
514 err_sw_init:
515 err_eeprom:
516         iounmap(adapter->hw.hw_addr);
517 err_ioremap:
518         free_netdev(netdev);
519 err_alloc_etherdev:
520         pci_release_regions(pdev);
521 err_request_regions:
522 err_dma_mask:
523         pci_disable_device(pdev);
524         return err;
525 }
526
527 /**
528  * ixgb_remove - Device Removal Routine
529  * @pdev: PCI device information struct
530  *
531  * ixgb_remove is called by the PCI subsystem to alert the driver
532  * that it should release a PCI device.  The could be caused by a
533  * Hot-Plug event, or because the driver is going to be removed from
534  * memory.
535  **/
536
537 static void __devexit
538 ixgb_remove(struct pci_dev *pdev)
539 {
540         struct net_device *netdev = pci_get_drvdata(pdev);
541         struct ixgb_adapter *adapter = netdev_priv(netdev);
542
543         unregister_netdev(netdev);
544
545         iounmap(adapter->hw.hw_addr);
546         pci_release_regions(pdev);
547
548         free_netdev(netdev);
549 }
550
551 /**
552  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
553  * @adapter: board private structure to initialize
554  *
555  * ixgb_sw_init initializes the Adapter private data structure.
556  * Fields are initialized based on PCI device information and
557  * OS network device settings (MTU size).
558  **/
559
560 static int __devinit
561 ixgb_sw_init(struct ixgb_adapter *adapter)
562 {
563         struct ixgb_hw *hw = &adapter->hw;
564         struct net_device *netdev = adapter->netdev;
565         struct pci_dev *pdev = adapter->pdev;
566
567         /* PCI config space info */
568
569         hw->vendor_id = pdev->vendor;
570         hw->device_id = pdev->device;
571         hw->subsystem_vendor_id = pdev->subsystem_vendor;
572         hw->subsystem_id = pdev->subsystem_device;
573
574         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
575         adapter->rx_buffer_len = hw->max_frame_size;
576
577         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
578            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
579            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
580            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
581                         hw->mac_type = ixgb_82597;
582         else {
583                 /* should never have loaded on this device */
584                 DPRINTK(PROBE, ERR, "unsupported device id\n");
585         }
586
587         /* enable flow control to be programmed */
588         hw->fc.send_xon = 1;
589
590         atomic_set(&adapter->irq_sem, 1);
591         spin_lock_init(&adapter->tx_lock);
592
593         return 0;
594 }
595
596 /**
597  * ixgb_open - Called when a network interface is made active
598  * @netdev: network interface device structure
599  *
600  * Returns 0 on success, negative value on failure
601  *
602  * The open entry point is called when a network interface is made
603  * active by the system (IFF_UP).  At this point all resources needed
604  * for transmit and receive operations are allocated, the interrupt
605  * handler is registered with the OS, the watchdog timer is started,
606  * and the stack is notified that the interface is ready.
607  **/
608
609 static int
610 ixgb_open(struct net_device *netdev)
611 {
612         struct ixgb_adapter *adapter = netdev_priv(netdev);
613         int err;
614
615         /* allocate transmit descriptors */
616
617         if((err = ixgb_setup_tx_resources(adapter)))
618                 goto err_setup_tx;
619
620         /* allocate receive descriptors */
621
622         if((err = ixgb_setup_rx_resources(adapter)))
623                 goto err_setup_rx;
624
625         if((err = ixgb_up(adapter)))
626                 goto err_up;
627
628         return 0;
629
630 err_up:
631         ixgb_free_rx_resources(adapter);
632 err_setup_rx:
633         ixgb_free_tx_resources(adapter);
634 err_setup_tx:
635         ixgb_reset(adapter);
636
637         return err;
638 }
639
640 /**
641  * ixgb_close - Disables a network interface
642  * @netdev: network interface device structure
643  *
644  * Returns 0, this is not allowed to fail
645  *
646  * The close entry point is called when an interface is de-activated
647  * by the OS.  The hardware is still under the drivers control, but
648  * needs to be disabled.  A global MAC reset is issued to stop the
649  * hardware, and all transmit and receive resources are freed.
650  **/
651
652 static int
653 ixgb_close(struct net_device *netdev)
654 {
655         struct ixgb_adapter *adapter = netdev_priv(netdev);
656
657         ixgb_down(adapter, TRUE);
658
659         ixgb_free_tx_resources(adapter);
660         ixgb_free_rx_resources(adapter);
661
662         return 0;
663 }
664
665 /**
666  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
667  * @adapter: board private structure
668  *
669  * Return 0 on success, negative on failure
670  **/
671
672 int
673 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
674 {
675         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
676         struct pci_dev *pdev = adapter->pdev;
677         int size;
678
679         size = sizeof(struct ixgb_buffer) * txdr->count;
680         txdr->buffer_info = vmalloc(size);
681         if(!txdr->buffer_info) {
682                 DPRINTK(PROBE, ERR,
683                  "Unable to allocate transmit descriptor ring memory\n");
684                 return -ENOMEM;
685         }
686         memset(txdr->buffer_info, 0, size);
687
688         /* round up to nearest 4K */
689
690         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
691         IXGB_ROUNDUP(txdr->size, 4096);
692
693         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
694         if(!txdr->desc) {
695                 vfree(txdr->buffer_info);
696                 DPRINTK(PROBE, ERR,
697                  "Unable to allocate transmit descriptor memory\n");
698                 return -ENOMEM;
699         }
700         memset(txdr->desc, 0, txdr->size);
701
702         txdr->next_to_use = 0;
703         txdr->next_to_clean = 0;
704
705         return 0;
706 }
707
708 /**
709  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
710  * @adapter: board private structure
711  *
712  * Configure the Tx unit of the MAC after a reset.
713  **/
714
715 static void
716 ixgb_configure_tx(struct ixgb_adapter *adapter)
717 {
718         uint64_t tdba = adapter->tx_ring.dma;
719         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
720         uint32_t tctl;
721         struct ixgb_hw *hw = &adapter->hw;
722
723         /* Setup the Base and Length of the Tx Descriptor Ring 
724          * tx_ring.dma can be either a 32 or 64 bit value 
725          */
726
727         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
728         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
729
730         IXGB_WRITE_REG(hw, TDLEN, tdlen);
731
732         /* Setup the HW Tx Head and Tail descriptor pointers */
733
734         IXGB_WRITE_REG(hw, TDH, 0);
735         IXGB_WRITE_REG(hw, TDT, 0);
736
737         /* don't set up txdctl, it induces performance problems if configured
738          * incorrectly */
739         /* Set the Tx Interrupt Delay register */
740
741         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
742
743         /* Program the Transmit Control Register */
744
745         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
746         IXGB_WRITE_REG(hw, TCTL, tctl);
747
748         /* Setup Transmit Descriptor Settings for this adapter */
749         adapter->tx_cmd_type =
750                 IXGB_TX_DESC_TYPE 
751                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
752 }
753
754 /**
755  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
756  * @adapter: board private structure
757  *
758  * Returns 0 on success, negative on failure
759  **/
760
761 int
762 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
763 {
764         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
765         struct pci_dev *pdev = adapter->pdev;
766         int size;
767
768         size = sizeof(struct ixgb_buffer) * rxdr->count;
769         rxdr->buffer_info = vmalloc(size);
770         if(!rxdr->buffer_info) {
771                 DPRINTK(PROBE, ERR,
772                  "Unable to allocate receive descriptor ring\n");
773                 return -ENOMEM;
774         }
775         memset(rxdr->buffer_info, 0, size);
776
777         /* Round up to nearest 4K */
778
779         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
780         IXGB_ROUNDUP(rxdr->size, 4096);
781
782         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
783
784         if(!rxdr->desc) {
785                 vfree(rxdr->buffer_info);
786                 DPRINTK(PROBE, ERR,
787                  "Unable to allocate receive descriptors\n");
788                 return -ENOMEM;
789         }
790         memset(rxdr->desc, 0, rxdr->size);
791
792         rxdr->next_to_clean = 0;
793         rxdr->next_to_use = 0;
794
795         return 0;
796 }
797
798 /**
799  * ixgb_setup_rctl - configure the receive control register
800  * @adapter: Board private structure
801  **/
802
803 static void
804 ixgb_setup_rctl(struct ixgb_adapter *adapter)
805 {
806         uint32_t rctl;
807
808         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
809
810         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
811
812         rctl |=
813                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
814                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
815                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
816
817         rctl |= IXGB_RCTL_SECRC;
818
819         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
820                 rctl |= IXGB_RCTL_BSIZE_2048;
821         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
822                 rctl |= IXGB_RCTL_BSIZE_4096;
823         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
824                 rctl |= IXGB_RCTL_BSIZE_8192;
825         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
826                 rctl |= IXGB_RCTL_BSIZE_16384;
827
828         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
829 }
830
831 /**
832  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
833  * @adapter: board private structure
834  *
835  * Configure the Rx unit of the MAC after a reset.
836  **/
837
838 static void
839 ixgb_configure_rx(struct ixgb_adapter *adapter)
840 {
841         uint64_t rdba = adapter->rx_ring.dma;
842         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
843         struct ixgb_hw *hw = &adapter->hw;
844         uint32_t rctl;
845         uint32_t rxcsum;
846         uint32_t rxdctl;
847
848         /* make sure receives are disabled while setting up the descriptors */
849
850         rctl = IXGB_READ_REG(hw, RCTL);
851         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
852
853         /* set the Receive Delay Timer Register */
854
855         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
856
857         /* Setup the Base and Length of the Rx Descriptor Ring */
858
859         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
860         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
861
862         IXGB_WRITE_REG(hw, RDLEN, rdlen);
863
864         /* Setup the HW Rx Head and Tail Descriptor Pointers */
865         IXGB_WRITE_REG(hw, RDH, 0);
866         IXGB_WRITE_REG(hw, RDT, 0);
867
868         /* set up pre-fetching of receive buffers so we get some before we
869          * run out (default hardware behavior is to run out before fetching
870          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
871          * and the descriptors in hw cache are below PTHRESH.  This avoids
872          * the hardware behavior of fetching <=512 descriptors in a single
873          * burst that pre-empts all other activity, usually causing fifo
874          * overflows. */
875         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
876         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
877                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
878                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
879         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
880
881         /* Enable Receive Checksum Offload for TCP and UDP */
882         if(adapter->rx_csum == TRUE) {
883                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
884                 rxcsum |= IXGB_RXCSUM_TUOFL;
885                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
886         }
887
888         /* Enable Receives */
889
890         IXGB_WRITE_REG(hw, RCTL, rctl);
891 }
892
893 /**
894  * ixgb_free_tx_resources - Free Tx Resources
895  * @adapter: board private structure
896  *
897  * Free all transmit software resources
898  **/
899
900 void
901 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
902 {
903         struct pci_dev *pdev = adapter->pdev;
904
905         ixgb_clean_tx_ring(adapter);
906
907         vfree(adapter->tx_ring.buffer_info);
908         adapter->tx_ring.buffer_info = NULL;
909
910         pci_free_consistent(pdev, adapter->tx_ring.size,
911                             adapter->tx_ring.desc, adapter->tx_ring.dma);
912
913         adapter->tx_ring.desc = NULL;
914 }
915
916 static void
917 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
918                                         struct ixgb_buffer *buffer_info)
919 {
920         struct pci_dev *pdev = adapter->pdev;
921
922         if (buffer_info->dma)
923                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
924                                PCI_DMA_TODEVICE);
925
926         if (buffer_info->skb)
927                 dev_kfree_skb_any(buffer_info->skb);
928
929         buffer_info->skb = NULL;
930         buffer_info->dma = 0;
931         buffer_info->time_stamp = 0;
932         /* these fields must always be initialized in tx
933          * buffer_info->length = 0;
934          * buffer_info->next_to_watch = 0; */
935 }
936
937 /**
938  * ixgb_clean_tx_ring - Free Tx Buffers
939  * @adapter: board private structure
940  **/
941
942 static void
943 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
944 {
945         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
946         struct ixgb_buffer *buffer_info;
947         unsigned long size;
948         unsigned int i;
949
950         /* Free all the Tx ring sk_buffs */
951
952         for(i = 0; i < tx_ring->count; i++) {
953                 buffer_info = &tx_ring->buffer_info[i];
954                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
955         }
956
957         size = sizeof(struct ixgb_buffer) * tx_ring->count;
958         memset(tx_ring->buffer_info, 0, size);
959
960         /* Zero out the descriptor ring */
961
962         memset(tx_ring->desc, 0, tx_ring->size);
963
964         tx_ring->next_to_use = 0;
965         tx_ring->next_to_clean = 0;
966
967         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
968         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
969 }
970
971 /**
972  * ixgb_free_rx_resources - Free Rx Resources
973  * @adapter: board private structure
974  *
975  * Free all receive software resources
976  **/
977
978 void
979 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
980 {
981         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
982         struct pci_dev *pdev = adapter->pdev;
983
984         ixgb_clean_rx_ring(adapter);
985
986         vfree(rx_ring->buffer_info);
987         rx_ring->buffer_info = NULL;
988
989         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
990
991         rx_ring->desc = NULL;
992 }
993
994 /**
995  * ixgb_clean_rx_ring - Free Rx Buffers
996  * @adapter: board private structure
997  **/
998
999 static void
1000 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1001 {
1002         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1003         struct ixgb_buffer *buffer_info;
1004         struct pci_dev *pdev = adapter->pdev;
1005         unsigned long size;
1006         unsigned int i;
1007
1008         /* Free all the Rx ring sk_buffs */
1009
1010         for(i = 0; i < rx_ring->count; i++) {
1011                 buffer_info = &rx_ring->buffer_info[i];
1012                 if(buffer_info->skb) {
1013
1014                         pci_unmap_single(pdev,
1015                                          buffer_info->dma,
1016                                          buffer_info->length,
1017                                          PCI_DMA_FROMDEVICE);
1018
1019                         dev_kfree_skb(buffer_info->skb);
1020
1021                         buffer_info->skb = NULL;
1022                 }
1023         }
1024
1025         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1026         memset(rx_ring->buffer_info, 0, size);
1027
1028         /* Zero out the descriptor ring */
1029
1030         memset(rx_ring->desc, 0, rx_ring->size);
1031
1032         rx_ring->next_to_clean = 0;
1033         rx_ring->next_to_use = 0;
1034
1035         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1036         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1037 }
1038
1039 /**
1040  * ixgb_set_mac - Change the Ethernet Address of the NIC
1041  * @netdev: network interface device structure
1042  * @p: pointer to an address structure
1043  *
1044  * Returns 0 on success, negative on failure
1045  **/
1046
1047 static int
1048 ixgb_set_mac(struct net_device *netdev, void *p)
1049 {
1050         struct ixgb_adapter *adapter = netdev_priv(netdev);
1051         struct sockaddr *addr = p;
1052
1053         if(!is_valid_ether_addr(addr->sa_data))
1054                 return -EADDRNOTAVAIL;
1055
1056         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1057
1058         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1059
1060         return 0;
1061 }
1062
1063 /**
1064  * ixgb_set_multi - Multicast and Promiscuous mode set
1065  * @netdev: network interface device structure
1066  *
1067  * The set_multi entry point is called whenever the multicast address
1068  * list or the network interface flags are updated.  This routine is
1069  * responsible for configuring the hardware for proper multicast,
1070  * promiscuous mode, and all-multi behavior.
1071  **/
1072
1073 static void
1074 ixgb_set_multi(struct net_device *netdev)
1075 {
1076         struct ixgb_adapter *adapter = netdev_priv(netdev);
1077         struct ixgb_hw *hw = &adapter->hw;
1078         struct dev_mc_list *mc_ptr;
1079         uint32_t rctl;
1080         int i;
1081
1082         /* Check for Promiscuous and All Multicast modes */
1083
1084         rctl = IXGB_READ_REG(hw, RCTL);
1085
1086         if(netdev->flags & IFF_PROMISC) {
1087                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1088         } else if(netdev->flags & IFF_ALLMULTI) {
1089                 rctl |= IXGB_RCTL_MPE;
1090                 rctl &= ~IXGB_RCTL_UPE;
1091         } else {
1092                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1093         }
1094
1095         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1096                 rctl |= IXGB_RCTL_MPE;
1097                 IXGB_WRITE_REG(hw, RCTL, rctl);
1098         } else {
1099                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1100
1101                 IXGB_WRITE_REG(hw, RCTL, rctl);
1102
1103                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1104                         i++, mc_ptr = mc_ptr->next)
1105                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1106                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1107
1108                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1109         }
1110 }
1111
1112 /**
1113  * ixgb_watchdog - Timer Call-back
1114  * @data: pointer to netdev cast into an unsigned long
1115  **/
1116
1117 static void
1118 ixgb_watchdog(unsigned long data)
1119 {
1120         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1121         struct net_device *netdev = adapter->netdev;
1122         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1123
1124         ixgb_check_for_link(&adapter->hw);
1125
1126         if (ixgb_check_for_bad_link(&adapter->hw)) {
1127                 /* force the reset path */
1128                 netif_stop_queue(netdev);
1129         }
1130
1131         if(adapter->hw.link_up) {
1132                 if(!netif_carrier_ok(netdev)) {
1133                         DPRINTK(LINK, INFO,
1134                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1135                         adapter->link_speed = 10000;
1136                         adapter->link_duplex = FULL_DUPLEX;
1137                         netif_carrier_on(netdev);
1138                         netif_wake_queue(netdev);
1139                 }
1140         } else {
1141                 if(netif_carrier_ok(netdev)) {
1142                         adapter->link_speed = 0;
1143                         adapter->link_duplex = 0;
1144                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1145                         netif_carrier_off(netdev);
1146                         netif_stop_queue(netdev);
1147
1148                 }
1149         }
1150
1151         ixgb_update_stats(adapter);
1152
1153         if(!netif_carrier_ok(netdev)) {
1154                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1155                         /* We've lost link, so the controller stops DMA,
1156                          * but we've got queued Tx work that's never going
1157                          * to get done, so reset controller to flush Tx.
1158                          * (Do the reset outside of interrupt context). */
1159                         schedule_work(&adapter->tx_timeout_task);
1160                 }
1161         }
1162
1163         /* Force detection of hung controller every watchdog period */
1164         adapter->detect_tx_hung = TRUE;
1165
1166         /* generate an interrupt to force clean up of any stragglers */
1167         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1168
1169         /* Reset the timer */
1170         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1171 }
1172
1173 #define IXGB_TX_FLAGS_CSUM              0x00000001
1174 #define IXGB_TX_FLAGS_VLAN              0x00000002
1175 #define IXGB_TX_FLAGS_TSO               0x00000004
1176
1177 static int
1178 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1179 {
1180 #ifdef NETIF_F_TSO
1181         struct ixgb_context_desc *context_desc;
1182         unsigned int i;
1183         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1184         uint16_t ipcse, tucse, mss;
1185         int err;
1186
1187         if (likely(skb_is_gso(skb))) {
1188                 struct ixgb_buffer *buffer_info;
1189                 if (skb_header_cloned(skb)) {
1190                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1191                         if (err)
1192                                 return err;
1193                 }
1194
1195                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1196                 mss = skb_shinfo(skb)->gso_size;
1197                 skb->nh.iph->tot_len = 0;
1198                 skb->nh.iph->check = 0;
1199                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1200                                                       skb->nh.iph->daddr,
1201                                                       0, IPPROTO_TCP, 0);
1202                 ipcss = skb->nh.raw - skb->data;
1203                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1204                 ipcse = skb->h.raw - skb->data - 1;
1205                 tucss = skb->h.raw - skb->data;
1206                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1207                 tucse = 0;
1208
1209                 i = adapter->tx_ring.next_to_use;
1210                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1211                 buffer_info = &adapter->tx_ring.buffer_info[i];
1212                 WARN_ON(buffer_info->dma != 0);
1213
1214                 context_desc->ipcss = ipcss;
1215                 context_desc->ipcso = ipcso;
1216                 context_desc->ipcse = cpu_to_le16(ipcse);
1217                 context_desc->tucss = tucss;
1218                 context_desc->tucso = tucso;
1219                 context_desc->tucse = cpu_to_le16(tucse);
1220                 context_desc->mss = cpu_to_le16(mss);
1221                 context_desc->hdr_len = hdr_len;
1222                 context_desc->status = 0;
1223                 context_desc->cmd_type_len = cpu_to_le32(
1224                                                   IXGB_CONTEXT_DESC_TYPE 
1225                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1226                                                 | IXGB_CONTEXT_DESC_CMD_IP
1227                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1228                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1229                                                 | (skb->len - (hdr_len)));
1230
1231
1232                 if(++i == adapter->tx_ring.count) i = 0;
1233                 adapter->tx_ring.next_to_use = i;
1234
1235                 return 1;
1236         }
1237 #endif
1238
1239         return 0;
1240 }
1241
1242 static boolean_t
1243 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1244 {
1245         struct ixgb_context_desc *context_desc;
1246         unsigned int i;
1247         uint8_t css, cso;
1248
1249         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1250                 struct ixgb_buffer *buffer_info;
1251                 css = skb->h.raw - skb->data;
1252                 cso = (skb->h.raw + skb->csum) - skb->data;
1253
1254                 i = adapter->tx_ring.next_to_use;
1255                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1256                 buffer_info = &adapter->tx_ring.buffer_info[i];
1257                 WARN_ON(buffer_info->dma != 0);
1258
1259                 context_desc->tucss = css;
1260                 context_desc->tucso = cso;
1261                 context_desc->tucse = 0;
1262                 /* zero out any previously existing data in one instruction */
1263                 *(uint32_t *)&(context_desc->ipcss) = 0;
1264                 context_desc->status = 0;
1265                 context_desc->hdr_len = 0;
1266                 context_desc->mss = 0;
1267                 context_desc->cmd_type_len =
1268                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1269                                     | IXGB_TX_DESC_CMD_IDE);
1270
1271                 if(++i == adapter->tx_ring.count) i = 0;
1272                 adapter->tx_ring.next_to_use = i;
1273
1274                 return TRUE;
1275         }
1276
1277         return FALSE;
1278 }
1279
1280 #define IXGB_MAX_TXD_PWR        14
1281 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1282
1283 static int
1284 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1285             unsigned int first)
1286 {
1287         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1288         struct ixgb_buffer *buffer_info;
1289         int len = skb->len;
1290         unsigned int offset = 0, size, count = 0, i;
1291
1292         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1293         unsigned int f;
1294
1295         len -= skb->data_len;
1296
1297         i = tx_ring->next_to_use;
1298
1299         while(len) {
1300                 buffer_info = &tx_ring->buffer_info[i];
1301                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1302                 buffer_info->length = size;
1303                 WARN_ON(buffer_info->dma != 0);
1304                 buffer_info->dma =
1305                         pci_map_single(adapter->pdev,
1306                                 skb->data + offset,
1307                                 size,
1308                                 PCI_DMA_TODEVICE);
1309                 buffer_info->time_stamp = jiffies;
1310                 buffer_info->next_to_watch = 0;
1311
1312                 len -= size;
1313                 offset += size;
1314                 count++;
1315                 if(++i == tx_ring->count) i = 0;
1316         }
1317
1318         for(f = 0; f < nr_frags; f++) {
1319                 struct skb_frag_struct *frag;
1320
1321                 frag = &skb_shinfo(skb)->frags[f];
1322                 len = frag->size;
1323                 offset = 0;
1324
1325                 while(len) {
1326                         buffer_info = &tx_ring->buffer_info[i];
1327                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1328                         buffer_info->length = size;
1329                         buffer_info->dma =
1330                                 pci_map_page(adapter->pdev,
1331                                         frag->page,
1332                                         frag->page_offset + offset,
1333                                         size,
1334                                         PCI_DMA_TODEVICE);
1335                         buffer_info->time_stamp = jiffies;
1336                         buffer_info->next_to_watch = 0;
1337
1338                         len -= size;
1339                         offset += size;
1340                         count++;
1341                         if(++i == tx_ring->count) i = 0;
1342                 }
1343         }
1344         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1345         tx_ring->buffer_info[i].skb = skb;
1346         tx_ring->buffer_info[first].next_to_watch = i;
1347
1348         return count;
1349 }
1350
1351 static void
1352 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1353 {
1354         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1355         struct ixgb_tx_desc *tx_desc = NULL;
1356         struct ixgb_buffer *buffer_info;
1357         uint32_t cmd_type_len = adapter->tx_cmd_type;
1358         uint8_t status = 0;
1359         uint8_t popts = 0;
1360         unsigned int i;
1361
1362         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1363                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1364                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1365         }
1366
1367         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1368                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1369
1370         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1371                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1372         }
1373
1374         i = tx_ring->next_to_use;
1375
1376         while(count--) {
1377                 buffer_info = &tx_ring->buffer_info[i];
1378                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1379                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1380                 tx_desc->cmd_type_len =
1381                         cpu_to_le32(cmd_type_len | buffer_info->length);
1382                 tx_desc->status = status;
1383                 tx_desc->popts = popts;
1384                 tx_desc->vlan = cpu_to_le16(vlan_id);
1385
1386                 if(++i == tx_ring->count) i = 0;
1387         }
1388
1389         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1390                                 | IXGB_TX_DESC_CMD_RS );
1391
1392         /* Force memory writes to complete before letting h/w
1393          * know there are new descriptors to fetch.  (Only
1394          * applicable for weak-ordered memory model archs,
1395          * such as IA-64). */
1396         wmb();
1397
1398         tx_ring->next_to_use = i;
1399         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1400 }
1401
1402 /* Tx Descriptors needed, worst case */
1403 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1404                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1405 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1406         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1407
1408 static int
1409 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1410 {
1411         struct ixgb_adapter *adapter = netdev_priv(netdev);
1412         unsigned int first;
1413         unsigned int tx_flags = 0;
1414         unsigned long flags;
1415         int vlan_id = 0;
1416         int tso;
1417
1418         if(skb->len <= 0) {
1419                 dev_kfree_skb_any(skb);
1420                 return 0;
1421         }
1422
1423 #ifdef NETIF_F_LLTX
1424         local_irq_save(flags);
1425         if (!spin_trylock(&adapter->tx_lock)) {
1426                 /* Collision - tell upper layer to requeue */
1427                 local_irq_restore(flags);
1428                 return NETDEV_TX_LOCKED;
1429         }
1430 #else
1431         spin_lock_irqsave(&adapter->tx_lock, flags);
1432 #endif
1433
1434         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1435                 netif_stop_queue(netdev);
1436                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1437                 return NETDEV_TX_BUSY;
1438         }
1439
1440 #ifndef NETIF_F_LLTX
1441         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1442 #endif
1443
1444         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1445                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1446                 vlan_id = vlan_tx_tag_get(skb);
1447         }
1448
1449         first = adapter->tx_ring.next_to_use;
1450         
1451         tso = ixgb_tso(adapter, skb);
1452         if (tso < 0) {
1453                 dev_kfree_skb_any(skb);
1454 #ifdef NETIF_F_LLTX
1455                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1456 #endif
1457                 return NETDEV_TX_OK;
1458         }
1459
1460         if (likely(tso))
1461                 tx_flags |= IXGB_TX_FLAGS_TSO;
1462         else if(ixgb_tx_csum(adapter, skb))
1463                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1464
1465         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1466                         tx_flags);
1467
1468         netdev->trans_start = jiffies;
1469
1470 #ifdef NETIF_F_LLTX
1471         /* Make sure there is space in the ring for the next send. */
1472         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1473                 netif_stop_queue(netdev);
1474
1475         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1476
1477 #endif
1478         return NETDEV_TX_OK;
1479 }
1480
1481 /**
1482  * ixgb_tx_timeout - Respond to a Tx Hang
1483  * @netdev: network interface device structure
1484  **/
1485
1486 static void
1487 ixgb_tx_timeout(struct net_device *netdev)
1488 {
1489         struct ixgb_adapter *adapter = netdev_priv(netdev);
1490
1491         /* Do the reset outside of interrupt context */
1492         schedule_work(&adapter->tx_timeout_task);
1493 }
1494
1495 static void
1496 ixgb_tx_timeout_task(struct net_device *netdev)
1497 {
1498         struct ixgb_adapter *adapter = netdev_priv(netdev);
1499
1500         adapter->tx_timeout_count++;
1501         ixgb_down(adapter, TRUE);
1502         ixgb_up(adapter);
1503 }
1504
1505 /**
1506  * ixgb_get_stats - Get System Network Statistics
1507  * @netdev: network interface device structure
1508  *
1509  * Returns the address of the device statistics structure.
1510  * The statistics are actually updated from the timer callback.
1511  **/
1512
1513 static struct net_device_stats *
1514 ixgb_get_stats(struct net_device *netdev)
1515 {
1516         struct ixgb_adapter *adapter = netdev_priv(netdev);
1517
1518         return &adapter->net_stats;
1519 }
1520
1521 /**
1522  * ixgb_change_mtu - Change the Maximum Transfer Unit
1523  * @netdev: network interface device structure
1524  * @new_mtu: new value for maximum frame size
1525  *
1526  * Returns 0 on success, negative on failure
1527  **/
1528
1529 static int
1530 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1531 {
1532         struct ixgb_adapter *adapter = netdev_priv(netdev);
1533         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1534         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1535
1536
1537         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1538            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1539                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1540                 return -EINVAL;
1541         }
1542
1543         adapter->rx_buffer_len = max_frame;
1544
1545         netdev->mtu = new_mtu;
1546
1547         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1548                 ixgb_down(adapter, TRUE);
1549                 ixgb_up(adapter);
1550         }
1551
1552         return 0;
1553 }
1554
1555 /**
1556  * ixgb_update_stats - Update the board statistics counters.
1557  * @adapter: board private structure
1558  **/
1559
1560 void
1561 ixgb_update_stats(struct ixgb_adapter *adapter)
1562 {
1563         struct net_device *netdev = adapter->netdev;
1564         struct pci_dev *pdev = adapter->pdev;
1565
1566         /* Prevent stats update while adapter is being reset */
1567         if (pdev->error_state && pdev->error_state != pci_channel_io_normal)
1568                 return;
1569
1570         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1571            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1572                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1573                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1574                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1575                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1576
1577                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1578                 /* fix up multicast stats by removing broadcasts */
1579                 if(multi >= bcast)
1580                         multi -= bcast;
1581                 
1582                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1583                 adapter->stats.mprch += (multi >> 32);
1584                 adapter->stats.bprcl += bcast_l; 
1585                 adapter->stats.bprch += bcast_h;
1586         } else {
1587                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1588                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1589                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1590                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1591         }
1592         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1593         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1594         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1595         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1596         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1597         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1598         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1599         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1600         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1601         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1602         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1603         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1604         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1605         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1606         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1607         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1608         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1609         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1610         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1611         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1612         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1613         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1614         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1615         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1616         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1617         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1618         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1619         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1620         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1621         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1622         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1623         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1624         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1625         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1626         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1627         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1628         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1629         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1630         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1631         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1632         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1633         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1634         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1635         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1636         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1637         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1638         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1639         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1640         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1641         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1642         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1643         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1644         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1645         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1646         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1647         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1648
1649         /* Fill out the OS statistics structure */
1650
1651         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1652         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1653         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1654         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1655         adapter->net_stats.multicast = adapter->stats.mprcl;
1656         adapter->net_stats.collisions = 0;
1657
1658         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1659          * with a length in the type/len field */
1660         adapter->net_stats.rx_errors =
1661             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1662             adapter->stats.ruc +
1663             adapter->stats.roc /*+ adapter->stats.rlec */  +
1664             adapter->stats.icbc +
1665             adapter->stats.ecbc + adapter->stats.mpc;
1666
1667         /* see above
1668          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1669          */
1670
1671         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1672         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1673         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1674         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1675
1676         adapter->net_stats.tx_errors = 0;
1677         adapter->net_stats.rx_frame_errors = 0;
1678         adapter->net_stats.tx_aborted_errors = 0;
1679         adapter->net_stats.tx_carrier_errors = 0;
1680         adapter->net_stats.tx_fifo_errors = 0;
1681         adapter->net_stats.tx_heartbeat_errors = 0;
1682         adapter->net_stats.tx_window_errors = 0;
1683 }
1684
1685 #define IXGB_MAX_INTR 10
1686 /**
1687  * ixgb_intr - Interrupt Handler
1688  * @irq: interrupt number
1689  * @data: pointer to a network interface device structure
1690  * @pt_regs: CPU registers structure
1691  **/
1692
1693 static irqreturn_t
1694 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1695 {
1696         struct net_device *netdev = data;
1697         struct ixgb_adapter *adapter = netdev_priv(netdev);
1698         struct ixgb_hw *hw = &adapter->hw;
1699         uint32_t icr = IXGB_READ_REG(hw, ICR);
1700 #ifndef CONFIG_IXGB_NAPI
1701         unsigned int i;
1702 #endif
1703
1704         if(unlikely(!icr))
1705                 return IRQ_NONE;  /* Not our interrupt */
1706
1707         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1708                 mod_timer(&adapter->watchdog_timer, jiffies);
1709         }
1710
1711 #ifdef CONFIG_IXGB_NAPI
1712         if(netif_rx_schedule_prep(netdev)) {
1713
1714                 /* Disable interrupts and register for poll. The flush 
1715                   of the posted write is intentionally left out.
1716                 */
1717
1718                 atomic_inc(&adapter->irq_sem);
1719                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1720                 __netif_rx_schedule(netdev);
1721         }
1722 #else
1723         /* yes, that is actually a & and it is meant to make sure that
1724          * every pass through this for loop checks both receive and
1725          * transmit queues for completed descriptors, intended to
1726          * avoid starvation issues and assist tx/rx fairness. */
1727         for(i = 0; i < IXGB_MAX_INTR; i++)
1728                 if(!ixgb_clean_rx_irq(adapter) &
1729                    !ixgb_clean_tx_irq(adapter))
1730                         break;
1731 #endif 
1732         return IRQ_HANDLED;
1733 }
1734
1735 #ifdef CONFIG_IXGB_NAPI
1736 /**
1737  * ixgb_clean - NAPI Rx polling callback
1738  * @adapter: board private structure
1739  **/
1740
1741 static int
1742 ixgb_clean(struct net_device *netdev, int *budget)
1743 {
1744         struct ixgb_adapter *adapter = netdev_priv(netdev);
1745         int work_to_do = min(*budget, netdev->quota);
1746         int tx_cleaned;
1747         int work_done = 0;
1748
1749         tx_cleaned = ixgb_clean_tx_irq(adapter);
1750         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1751
1752         *budget -= work_done;
1753         netdev->quota -= work_done;
1754
1755         /* if no Tx and not enough Rx work done, exit the polling mode */
1756         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1757                 netif_rx_complete(netdev);
1758                 ixgb_irq_enable(adapter);
1759                 return 0;
1760         }
1761
1762         return 1;
1763 }
1764 #endif
1765
1766 /**
1767  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1768  * @adapter: board private structure
1769  **/
1770
1771 static boolean_t
1772 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1773 {
1774         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1775         struct net_device *netdev = adapter->netdev;
1776         struct ixgb_tx_desc *tx_desc, *eop_desc;
1777         struct ixgb_buffer *buffer_info;
1778         unsigned int i, eop;
1779         boolean_t cleaned = FALSE;
1780
1781         i = tx_ring->next_to_clean;
1782         eop = tx_ring->buffer_info[i].next_to_watch;
1783         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1784
1785         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1786
1787                 for(cleaned = FALSE; !cleaned; ) {
1788                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1789                         buffer_info = &tx_ring->buffer_info[i];
1790
1791                         if (tx_desc->popts
1792                             & (IXGB_TX_DESC_POPTS_TXSM |
1793                                IXGB_TX_DESC_POPTS_IXSM))
1794                                 adapter->hw_csum_tx_good++;
1795
1796                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1797
1798                         *(uint32_t *)&(tx_desc->status) = 0;
1799
1800                         cleaned = (i == eop);
1801                         if(++i == tx_ring->count) i = 0;
1802                 }
1803
1804                 eop = tx_ring->buffer_info[i].next_to_watch;
1805                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1806         }
1807
1808         tx_ring->next_to_clean = i;
1809
1810         if (unlikely(netif_queue_stopped(netdev))) {
1811                 spin_lock(&adapter->tx_lock);
1812                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1813                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1814                         netif_wake_queue(netdev);
1815                 spin_unlock(&adapter->tx_lock);
1816         }
1817
1818         if(adapter->detect_tx_hung) {
1819                 /* detect a transmit hang in hardware, this serializes the
1820                  * check with the clearing of time_stamp and movement of i */
1821                 adapter->detect_tx_hung = FALSE;
1822                 if (tx_ring->buffer_info[eop].dma &&
1823                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1824                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1825                         IXGB_STATUS_TXOFF)) {
1826                         /* detected Tx unit hang */
1827                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1828                                         "  TDH                  <%x>\n"
1829                                         "  TDT                  <%x>\n"
1830                                         "  next_to_use          <%x>\n"
1831                                         "  next_to_clean        <%x>\n"
1832                                         "buffer_info[next_to_clean]\n"
1833                                         "  time_stamp           <%lx>\n"
1834                                         "  next_to_watch        <%x>\n"
1835                                         "  jiffies              <%lx>\n"
1836                                         "  next_to_watch.status <%x>\n",
1837                                 IXGB_READ_REG(&adapter->hw, TDH),
1838                                 IXGB_READ_REG(&adapter->hw, TDT),
1839                                 tx_ring->next_to_use,
1840                                 tx_ring->next_to_clean,
1841                                 tx_ring->buffer_info[eop].time_stamp,
1842                                 eop,
1843                                 jiffies,
1844                                 eop_desc->status);
1845                         netif_stop_queue(netdev);
1846                 }
1847         }
1848
1849         return cleaned;
1850 }
1851
1852 /**
1853  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1854  * @adapter: board private structure
1855  * @rx_desc: receive descriptor
1856  * @sk_buff: socket buffer with received data
1857  **/
1858
1859 static void
1860 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1861                  struct ixgb_rx_desc *rx_desc,
1862                  struct sk_buff *skb)
1863 {
1864         /* Ignore Checksum bit is set OR
1865          * TCP Checksum has not been calculated
1866          */
1867         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1868            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1869                 skb->ip_summed = CHECKSUM_NONE;
1870                 return;
1871         }
1872
1873         /* At this point we know the hardware did the TCP checksum */
1874         /* now look at the TCP checksum error bit */
1875         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1876                 /* let the stack verify checksum errors */
1877                 skb->ip_summed = CHECKSUM_NONE;
1878                 adapter->hw_csum_rx_error++;
1879         } else {
1880                 /* TCP checksum is good */
1881                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1882                 adapter->hw_csum_rx_good++;
1883         }
1884 }
1885
1886 /**
1887  * ixgb_clean_rx_irq - Send received data up the network stack,
1888  * @adapter: board private structure
1889  **/
1890
1891 static boolean_t
1892 #ifdef CONFIG_IXGB_NAPI
1893 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1894 #else
1895 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1896 #endif
1897 {
1898         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1899         struct net_device *netdev = adapter->netdev;
1900         struct pci_dev *pdev = adapter->pdev;
1901         struct ixgb_rx_desc *rx_desc, *next_rxd;
1902         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1903         uint32_t length;
1904         unsigned int i, j;
1905         boolean_t cleaned = FALSE;
1906
1907         i = rx_ring->next_to_clean;
1908         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1909         buffer_info = &rx_ring->buffer_info[i];
1910
1911         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1912                 struct sk_buff *skb, *next_skb;
1913                 u8 status;
1914
1915 #ifdef CONFIG_IXGB_NAPI
1916                 if(*work_done >= work_to_do)
1917                         break;
1918
1919                 (*work_done)++;
1920 #endif
1921                 status = rx_desc->status;
1922                 skb = buffer_info->skb;
1923                 buffer_info->skb = NULL;
1924
1925                 prefetch(skb->data);
1926
1927                 if(++i == rx_ring->count) i = 0;
1928                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1929                 prefetch(next_rxd);
1930
1931                 if((j = i + 1) == rx_ring->count) j = 0;
1932                 next2_buffer = &rx_ring->buffer_info[j];
1933                 prefetch(next2_buffer);
1934
1935                 next_buffer = &rx_ring->buffer_info[i];
1936                 next_skb = next_buffer->skb;
1937                 prefetch(next_skb);
1938
1939                 cleaned = TRUE;
1940
1941                 pci_unmap_single(pdev,
1942                                  buffer_info->dma,
1943                                  buffer_info->length,
1944                                  PCI_DMA_FROMDEVICE);
1945
1946                 length = le16_to_cpu(rx_desc->length);
1947
1948                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1949
1950                         /* All receives must fit into a single buffer */
1951
1952                         IXGB_DBG("Receive packet consumed multiple buffers "
1953                                          "length<%x>\n", length);
1954
1955                         dev_kfree_skb_irq(skb);
1956                         goto rxdesc_done;
1957                 }
1958
1959                 if (unlikely(rx_desc->errors
1960                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1961                                 | IXGB_RX_DESC_ERRORS_P |
1962                                 IXGB_RX_DESC_ERRORS_RXE))) {
1963
1964                         dev_kfree_skb_irq(skb);
1965                         goto rxdesc_done;
1966                 }
1967
1968                 /* code added for copybreak, this should improve
1969                  * performance for small packets with large amounts
1970                  * of reassembly being done in the stack */
1971 #define IXGB_CB_LENGTH 256
1972                 if (length < IXGB_CB_LENGTH) {
1973                         struct sk_buff *new_skb =
1974                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1975                         if (new_skb) {
1976                                 skb_reserve(new_skb, NET_IP_ALIGN);
1977                                 memcpy(new_skb->data - NET_IP_ALIGN,
1978                                        skb->data - NET_IP_ALIGN,
1979                                        length + NET_IP_ALIGN);
1980                                 /* save the skb in buffer_info as good */
1981                                 buffer_info->skb = skb;
1982                                 skb = new_skb;
1983                         }
1984                 }
1985                 /* end copybreak code */
1986
1987                 /* Good Receive */
1988                 skb_put(skb, length);
1989
1990                 /* Receive Checksum Offload */
1991                 ixgb_rx_checksum(adapter, rx_desc, skb);
1992
1993                 skb->protocol = eth_type_trans(skb, netdev);
1994 #ifdef CONFIG_IXGB_NAPI
1995                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1996                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1997                                 le16_to_cpu(rx_desc->special) &
1998                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1999                 } else {
2000                         netif_receive_skb(skb);
2001                 }
2002 #else /* CONFIG_IXGB_NAPI */
2003                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2004                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2005                                 le16_to_cpu(rx_desc->special) &
2006                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2007                 } else {
2008                         netif_rx(skb);
2009                 }
2010 #endif /* CONFIG_IXGB_NAPI */
2011                 netdev->last_rx = jiffies;
2012
2013 rxdesc_done:
2014                 /* clean up descriptor, might be written over by hw */
2015                 rx_desc->status = 0;
2016
2017                 /* use prefetched values */
2018                 rx_desc = next_rxd;
2019                 buffer_info = next_buffer;
2020         }
2021
2022         rx_ring->next_to_clean = i;
2023
2024         ixgb_alloc_rx_buffers(adapter);
2025
2026         return cleaned;
2027 }
2028
2029 /**
2030  * ixgb_alloc_rx_buffers - Replace used receive buffers
2031  * @adapter: address of board private structure
2032  **/
2033
2034 static void
2035 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2036 {
2037         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2038         struct net_device *netdev = adapter->netdev;
2039         struct pci_dev *pdev = adapter->pdev;
2040         struct ixgb_rx_desc *rx_desc;
2041         struct ixgb_buffer *buffer_info;
2042         struct sk_buff *skb;
2043         unsigned int i;
2044         int num_group_tail_writes;
2045         long cleancount;
2046
2047         i = rx_ring->next_to_use;
2048         buffer_info = &rx_ring->buffer_info[i];
2049         cleancount = IXGB_DESC_UNUSED(rx_ring);
2050
2051         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2052
2053         /* leave three descriptors unused */
2054         while(--cleancount > 2) {
2055                 /* recycle! its good for you */
2056                 skb = buffer_info->skb;
2057                 if (skb) {
2058                         skb_trim(skb, 0);
2059                         goto map_skb;
2060                 }
2061
2062                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2063                                        + NET_IP_ALIGN);
2064                 if (unlikely(!skb)) {
2065                         /* Better luck next round */
2066                         adapter->alloc_rx_buff_failed++;
2067                         break;
2068                 }
2069
2070                 /* Make buffer alignment 2 beyond a 16 byte boundary
2071                  * this will result in a 16 byte aligned IP header after
2072                  * the 14 byte MAC header is removed
2073                  */
2074                 skb_reserve(skb, NET_IP_ALIGN);
2075
2076                 buffer_info->skb = skb;
2077                 buffer_info->length = adapter->rx_buffer_len;
2078 map_skb:
2079                 buffer_info->dma = pci_map_single(pdev,
2080                                                   skb->data,
2081                                                   adapter->rx_buffer_len,
2082                                                   PCI_DMA_FROMDEVICE);
2083
2084                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2085                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2086                 /* guarantee DD bit not set now before h/w gets descriptor
2087                  * this is the rest of the workaround for h/w double 
2088                  * writeback. */
2089                 rx_desc->status = 0;
2090
2091
2092                 if(++i == rx_ring->count) i = 0;
2093                 buffer_info = &rx_ring->buffer_info[i];
2094         }
2095
2096         if (likely(rx_ring->next_to_use != i)) {
2097                 rx_ring->next_to_use = i;
2098                 if (unlikely(i-- == 0))
2099                         i = (rx_ring->count - 1);
2100
2101                 /* Force memory writes to complete before letting h/w
2102                  * know there are new descriptors to fetch.  (Only
2103                  * applicable for weak-ordered memory model archs, such
2104                  * as IA-64). */
2105                 wmb();
2106                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2107         }
2108 }
2109
2110 /**
2111  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2112  * 
2113  * @param netdev network interface device structure
2114  * @param grp indicates to enable or disable tagging/stripping
2115  **/
2116 static void
2117 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2118 {
2119         struct ixgb_adapter *adapter = netdev_priv(netdev);
2120         uint32_t ctrl, rctl;
2121
2122         ixgb_irq_disable(adapter);
2123         adapter->vlgrp = grp;
2124
2125         if(grp) {
2126                 /* enable VLAN tag insert/strip */
2127                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2128                 ctrl |= IXGB_CTRL0_VME;
2129                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2130
2131                 /* enable VLAN receive filtering */
2132
2133                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2134                 rctl |= IXGB_RCTL_VFE;
2135                 rctl &= ~IXGB_RCTL_CFIEN;
2136                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2137         } else {
2138                 /* disable VLAN tag insert/strip */
2139
2140                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2141                 ctrl &= ~IXGB_CTRL0_VME;
2142                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2143
2144                 /* disable VLAN filtering */
2145
2146                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2147                 rctl &= ~IXGB_RCTL_VFE;
2148                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2149         }
2150
2151         ixgb_irq_enable(adapter);
2152 }
2153
2154 static void
2155 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2156 {
2157         struct ixgb_adapter *adapter = netdev_priv(netdev);
2158         uint32_t vfta, index;
2159
2160         /* add VID to filter table */
2161
2162         index = (vid >> 5) & 0x7F;
2163         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2164         vfta |= (1 << (vid & 0x1F));
2165         ixgb_write_vfta(&adapter->hw, index, vfta);
2166 }
2167
2168 static void
2169 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2170 {
2171         struct ixgb_adapter *adapter = netdev_priv(netdev);
2172         uint32_t vfta, index;
2173
2174         ixgb_irq_disable(adapter);
2175
2176         if(adapter->vlgrp)
2177                 adapter->vlgrp->vlan_devices[vid] = NULL;
2178
2179         ixgb_irq_enable(adapter);
2180
2181         /* remove VID from filter table*/
2182
2183         index = (vid >> 5) & 0x7F;
2184         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2185         vfta &= ~(1 << (vid & 0x1F));
2186         ixgb_write_vfta(&adapter->hw, index, vfta);
2187 }
2188
2189 static void
2190 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2191 {
2192         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2193
2194         if(adapter->vlgrp) {
2195                 uint16_t vid;
2196                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2197                         if(!adapter->vlgrp->vlan_devices[vid])
2198                                 continue;
2199                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2200                 }
2201         }
2202 }
2203
2204 #ifdef CONFIG_NET_POLL_CONTROLLER
2205 /*
2206  * Polling 'interrupt' - used by things like netconsole to send skbs
2207  * without having to re-enable interrupts. It's not called while
2208  * the interrupt routine is executing.
2209  */
2210
2211 static void ixgb_netpoll(struct net_device *dev)
2212 {
2213         struct ixgb_adapter *adapter = netdev_priv(dev);
2214
2215         disable_irq(adapter->pdev->irq);
2216         ixgb_intr(adapter->pdev->irq, dev, NULL);
2217         enable_irq(adapter->pdev->irq);
2218 }
2219 #endif
2220
2221 /**
2222  * ixgb_io_error_detected() - called when PCI error is detected
2223  * @pdev    pointer to pci device with error
2224  * @state   pci channel state after error
2225  *
2226  * This callback is called by the PCI subsystem whenever
2227  * a PCI bus error is detected.
2228  */
2229 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2230                                      enum pci_channel_state state)
2231 {
2232         struct net_device *netdev = pci_get_drvdata(pdev);
2233         struct ixgb_adapter *adapter = netdev->priv;
2234
2235         if(netif_running(netdev))
2236                 ixgb_down(adapter, TRUE);
2237
2238         pci_disable_device(pdev);
2239
2240         /* Request a slot reset. */
2241         return PCI_ERS_RESULT_NEED_RESET;
2242 }
2243
2244 /**
2245  * ixgb_io_slot_reset - called after the pci bus has been reset.
2246  * @pdev    pointer to pci device with error
2247  *
2248  * This callback is called after the PCI buss has been reset.
2249  * Basically, this tries to restart the card from scratch.
2250  * This is a shortened version of the device probe/discovery code,
2251  * it resembles the first-half of the ixgb_probe() routine.
2252  */
2253 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2254 {
2255         struct net_device *netdev = pci_get_drvdata(pdev);
2256         struct ixgb_adapter *adapter = netdev->priv;
2257
2258         if(pci_enable_device(pdev)) {
2259                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2260                 return PCI_ERS_RESULT_DISCONNECT;
2261         }
2262
2263         /* Perform card reset only on one instance of the card */
2264         if (0 != PCI_FUNC (pdev->devfn))
2265                 return PCI_ERS_RESULT_RECOVERED;
2266
2267         pci_set_master(pdev);
2268
2269         netif_carrier_off(netdev);
2270         netif_stop_queue(netdev);
2271         ixgb_reset(adapter);
2272
2273         /* Make sure the EEPROM is good */
2274         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2275                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2276                 return PCI_ERS_RESULT_DISCONNECT;
2277         }
2278         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2279         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2280
2281         if(!is_valid_ether_addr(netdev->perm_addr)) {
2282                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2283                 return PCI_ERS_RESULT_DISCONNECT;
2284         }
2285
2286         return PCI_ERS_RESULT_RECOVERED;
2287 }
2288
2289 /**
2290  * ixgb_io_resume - called when its OK to resume normal operations
2291  * @pdev    pointer to pci device with error
2292  *
2293  * The error recovery driver tells us that its OK to resume
2294  * normal operation. Implementation resembles the second-half
2295  * of the ixgb_probe() routine.
2296  */
2297 static void ixgb_io_resume (struct pci_dev *pdev)
2298 {
2299         struct net_device *netdev = pci_get_drvdata(pdev);
2300         struct ixgb_adapter *adapter = netdev->priv;
2301
2302         pci_set_master(pdev);
2303
2304         if(netif_running(netdev)) {
2305                 if(ixgb_up(adapter)) {
2306                         printk ("ixgb: can't bring device back up after reset\n");
2307                         return;
2308                 }
2309         }
2310
2311         netif_device_attach(netdev);
2312         mod_timer(&adapter->watchdog_timer, jiffies);
2313 }
2314
2315 /* ixgb_main.c */