Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[linux-2.6] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3   Intel PRO/10GbE Linux driver
4   Copyright(c) 1999 - 2006 Intel Corporation.
5
6   This program is free software; you can redistribute it and/or modify it
7   under the terms and conditions of the GNU General Public License,
8   version 2, as published by the Free Software Foundation.
9
10   This program is distributed in the hope it will be useful, but WITHOUT
11   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
16   this program; if not, write to the Free Software Foundation, Inc.,
17   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
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             "1.0.126-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);
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 work_struct *work);
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, irq_flags = IRQF_SHARED;
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         /* only enable MSI if bus is in PCI-X mode */
250         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
251                 err = pci_enable_msi(adapter->pdev);
252                 if (!err) {
253                         adapter->have_msi = 1;
254                         irq_flags = 0;
255                 }
256                 /* proceed to try to request regular interrupt */
257         }
258
259         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
260                           netdev->name, netdev);
261         if (err) {
262                 if (adapter->have_msi)
263                         pci_disable_msi(adapter->pdev);
264                 DPRINTK(PROBE, ERR,
265                  "Unable to allocate interrupt Error: %d\n", err);
266                 return err;
267         }
268
269         if((hw->max_frame_size != max_frame) ||
270                 (hw->max_frame_size !=
271                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
272
273                 hw->max_frame_size = max_frame;
274
275                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
276
277                 if(hw->max_frame_size >
278                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
279                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
280
281                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
282                                 ctrl0 |= IXGB_CTRL0_JFE;
283                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
284                         }
285                 }
286         }
287
288         mod_timer(&adapter->watchdog_timer, jiffies);
289
290 #ifdef CONFIG_IXGB_NAPI
291         netif_poll_enable(netdev);
292 #endif
293         ixgb_irq_enable(adapter);
294
295         return 0;
296 }
297
298 void
299 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
300 {
301         struct net_device *netdev = adapter->netdev;
302
303         ixgb_irq_disable(adapter);
304         free_irq(adapter->pdev->irq, netdev);
305
306         if (adapter->have_msi)
307                 pci_disable_msi(adapter->pdev);
308
309         if(kill_watchdog)
310                 del_timer_sync(&adapter->watchdog_timer);
311 #ifdef CONFIG_IXGB_NAPI
312         netif_poll_disable(netdev);
313 #endif
314         adapter->link_speed = 0;
315         adapter->link_duplex = 0;
316         netif_carrier_off(netdev);
317         netif_stop_queue(netdev);
318
319         ixgb_reset(adapter);
320         ixgb_clean_tx_ring(adapter);
321         ixgb_clean_rx_ring(adapter);
322 }
323
324 void
325 ixgb_reset(struct ixgb_adapter *adapter)
326 {
327
328         ixgb_adapter_stop(&adapter->hw);
329         if(!ixgb_init_hw(&adapter->hw))
330                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
331 }
332
333 /**
334  * ixgb_probe - Device Initialization Routine
335  * @pdev: PCI device information struct
336  * @ent: entry in ixgb_pci_tbl
337  *
338  * Returns 0 on success, negative on failure
339  *
340  * ixgb_probe initializes an adapter identified by a pci_dev structure.
341  * The OS initialization, configuring of the adapter private structure,
342  * and a hardware reset occur.
343  **/
344
345 static int __devinit
346 ixgb_probe(struct pci_dev *pdev,
347                 const struct pci_device_id *ent)
348 {
349         struct net_device *netdev = NULL;
350         struct ixgb_adapter *adapter;
351         static int cards_found = 0;
352         unsigned long mmio_start;
353         int mmio_len;
354         int pci_using_dac;
355         int i;
356         int err;
357
358         if((err = pci_enable_device(pdev)))
359                 return err;
360
361         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
362            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
363                 pci_using_dac = 1;
364         } else {
365                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
366                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
367                         printk(KERN_ERR
368                          "ixgb: No usable DMA configuration, aborting\n");
369                         goto err_dma_mask;
370                 }
371                 pci_using_dac = 0;
372         }
373
374         if((err = pci_request_regions(pdev, ixgb_driver_name)))
375                 goto err_request_regions;
376
377         pci_set_master(pdev);
378
379         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
380         if(!netdev) {
381                 err = -ENOMEM;
382                 goto err_alloc_etherdev;
383         }
384
385         SET_MODULE_OWNER(netdev);
386         SET_NETDEV_DEV(netdev, &pdev->dev);
387
388         pci_set_drvdata(pdev, netdev);
389         adapter = netdev_priv(netdev);
390         adapter->netdev = netdev;
391         adapter->pdev = pdev;
392         adapter->hw.back = adapter;
393         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
394
395         mmio_start = pci_resource_start(pdev, BAR_0);
396         mmio_len = pci_resource_len(pdev, BAR_0);
397
398         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
399         if(!adapter->hw.hw_addr) {
400                 err = -EIO;
401                 goto err_ioremap;
402         }
403
404         for(i = BAR_1; i <= BAR_5; i++) {
405                 if(pci_resource_len(pdev, i) == 0)
406                         continue;
407                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
408                         adapter->hw.io_base = pci_resource_start(pdev, i);
409                         break;
410                 }
411         }
412
413         netdev->open = &ixgb_open;
414         netdev->stop = &ixgb_close;
415         netdev->hard_start_xmit = &ixgb_xmit_frame;
416         netdev->get_stats = &ixgb_get_stats;
417         netdev->set_multicast_list = &ixgb_set_multi;
418         netdev->set_mac_address = &ixgb_set_mac;
419         netdev->change_mtu = &ixgb_change_mtu;
420         ixgb_set_ethtool_ops(netdev);
421         netdev->tx_timeout = &ixgb_tx_timeout;
422         netdev->watchdog_timeo = 5 * HZ;
423 #ifdef CONFIG_IXGB_NAPI
424         netdev->poll = &ixgb_clean;
425         netdev->weight = 64;
426 #endif
427         netdev->vlan_rx_register = ixgb_vlan_rx_register;
428         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
429         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
430 #ifdef CONFIG_NET_POLL_CONTROLLER
431         netdev->poll_controller = ixgb_netpoll;
432 #endif
433
434         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
435         netdev->mem_start = mmio_start;
436         netdev->mem_end = mmio_start + mmio_len;
437         netdev->base_addr = adapter->hw.io_base;
438
439         adapter->bd_number = cards_found;
440         adapter->link_speed = 0;
441         adapter->link_duplex = 0;
442
443         /* setup the private structure */
444
445         if((err = ixgb_sw_init(adapter)))
446                 goto err_sw_init;
447
448         netdev->features = NETIF_F_SG |
449                            NETIF_F_HW_CSUM |
450                            NETIF_F_HW_VLAN_TX |
451                            NETIF_F_HW_VLAN_RX |
452                            NETIF_F_HW_VLAN_FILTER;
453         netdev->features |= NETIF_F_TSO;
454 #ifdef NETIF_F_LLTX
455         netdev->features |= NETIF_F_LLTX;
456 #endif
457
458         if(pci_using_dac)
459                 netdev->features |= NETIF_F_HIGHDMA;
460
461         /* make sure the EEPROM is good */
462
463         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
464                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
465                 err = -EIO;
466                 goto err_eeprom;
467         }
468
469         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
470         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
471
472         if(!is_valid_ether_addr(netdev->perm_addr)) {
473                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
474                 err = -EIO;
475                 goto err_eeprom;
476         }
477
478         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
479
480         init_timer(&adapter->watchdog_timer);
481         adapter->watchdog_timer.function = &ixgb_watchdog;
482         adapter->watchdog_timer.data = (unsigned long)adapter;
483
484         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
485
486         strcpy(netdev->name, "eth%d");
487         if((err = register_netdev(netdev)))
488                 goto err_register;
489
490         /* we're going to reset, so assume we have no link for now */
491
492         netif_carrier_off(netdev);
493         netif_stop_queue(netdev);
494
495         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
496         ixgb_check_options(adapter);
497         /* reset the hardware with the new settings */
498
499         ixgb_reset(adapter);
500
501         cards_found++;
502         return 0;
503
504 err_register:
505 err_sw_init:
506 err_eeprom:
507         iounmap(adapter->hw.hw_addr);
508 err_ioremap:
509         free_netdev(netdev);
510 err_alloc_etherdev:
511         pci_release_regions(pdev);
512 err_request_regions:
513 err_dma_mask:
514         pci_disable_device(pdev);
515         return err;
516 }
517
518 /**
519  * ixgb_remove - Device Removal Routine
520  * @pdev: PCI device information struct
521  *
522  * ixgb_remove is called by the PCI subsystem to alert the driver
523  * that it should release a PCI device.  The could be caused by a
524  * Hot-Plug event, or because the driver is going to be removed from
525  * memory.
526  **/
527
528 static void __devexit
529 ixgb_remove(struct pci_dev *pdev)
530 {
531         struct net_device *netdev = pci_get_drvdata(pdev);
532         struct ixgb_adapter *adapter = netdev_priv(netdev);
533
534         unregister_netdev(netdev);
535
536         iounmap(adapter->hw.hw_addr);
537         pci_release_regions(pdev);
538
539         free_netdev(netdev);
540 }
541
542 /**
543  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
544  * @adapter: board private structure to initialize
545  *
546  * ixgb_sw_init initializes the Adapter private data structure.
547  * Fields are initialized based on PCI device information and
548  * OS network device settings (MTU size).
549  **/
550
551 static int __devinit
552 ixgb_sw_init(struct ixgb_adapter *adapter)
553 {
554         struct ixgb_hw *hw = &adapter->hw;
555         struct net_device *netdev = adapter->netdev;
556         struct pci_dev *pdev = adapter->pdev;
557
558         /* PCI config space info */
559
560         hw->vendor_id = pdev->vendor;
561         hw->device_id = pdev->device;
562         hw->subsystem_vendor_id = pdev->subsystem_vendor;
563         hw->subsystem_id = pdev->subsystem_device;
564
565         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
566         adapter->rx_buffer_len = hw->max_frame_size;
567
568         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
569            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
570            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
571            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
572                         hw->mac_type = ixgb_82597;
573         else {
574                 /* should never have loaded on this device */
575                 DPRINTK(PROBE, ERR, "unsupported device id\n");
576         }
577
578         /* enable flow control to be programmed */
579         hw->fc.send_xon = 1;
580
581         atomic_set(&adapter->irq_sem, 1);
582         spin_lock_init(&adapter->tx_lock);
583
584         return 0;
585 }
586
587 /**
588  * ixgb_open - Called when a network interface is made active
589  * @netdev: network interface device structure
590  *
591  * Returns 0 on success, negative value on failure
592  *
593  * The open entry point is called when a network interface is made
594  * active by the system (IFF_UP).  At this point all resources needed
595  * for transmit and receive operations are allocated, the interrupt
596  * handler is registered with the OS, the watchdog timer is started,
597  * and the stack is notified that the interface is ready.
598  **/
599
600 static int
601 ixgb_open(struct net_device *netdev)
602 {
603         struct ixgb_adapter *adapter = netdev_priv(netdev);
604         int err;
605
606         /* allocate transmit descriptors */
607
608         if((err = ixgb_setup_tx_resources(adapter)))
609                 goto err_setup_tx;
610
611         /* allocate receive descriptors */
612
613         if((err = ixgb_setup_rx_resources(adapter)))
614                 goto err_setup_rx;
615
616         if((err = ixgb_up(adapter)))
617                 goto err_up;
618
619         return 0;
620
621 err_up:
622         ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624         ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626         ixgb_reset(adapter);
627
628         return err;
629 }
630
631 /**
632  * ixgb_close - Disables a network interface
633  * @netdev: network interface device structure
634  *
635  * Returns 0, this is not allowed to fail
636  *
637  * The close entry point is called when an interface is de-activated
638  * by the OS.  The hardware is still under the drivers control, but
639  * needs to be disabled.  A global MAC reset is issued to stop the
640  * hardware, and all transmit and receive resources are freed.
641  **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646         struct ixgb_adapter *adapter = netdev_priv(netdev);
647
648         ixgb_down(adapter, TRUE);
649
650         ixgb_free_tx_resources(adapter);
651         ixgb_free_rx_resources(adapter);
652
653         return 0;
654 }
655
656 /**
657  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658  * @adapter: board private structure
659  *
660  * Return 0 on success, negative on failure
661  **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667         struct pci_dev *pdev = adapter->pdev;
668         int size;
669
670         size = sizeof(struct ixgb_buffer) * txdr->count;
671         txdr->buffer_info = vmalloc(size);
672         if(!txdr->buffer_info) {
673                 DPRINTK(PROBE, ERR,
674                  "Unable to allocate transmit descriptor ring memory\n");
675                 return -ENOMEM;
676         }
677         memset(txdr->buffer_info, 0, size);
678
679         /* round up to nearest 4K */
680
681         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
682         txdr->size = ALIGN(txdr->size, 4096);
683
684         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
685         if(!txdr->desc) {
686                 vfree(txdr->buffer_info);
687                 DPRINTK(PROBE, ERR,
688                  "Unable to allocate transmit descriptor memory\n");
689                 return -ENOMEM;
690         }
691         memset(txdr->desc, 0, txdr->size);
692
693         txdr->next_to_use = 0;
694         txdr->next_to_clean = 0;
695
696         return 0;
697 }
698
699 /**
700  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
701  * @adapter: board private structure
702  *
703  * Configure the Tx unit of the MAC after a reset.
704  **/
705
706 static void
707 ixgb_configure_tx(struct ixgb_adapter *adapter)
708 {
709         uint64_t tdba = adapter->tx_ring.dma;
710         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
711         uint32_t tctl;
712         struct ixgb_hw *hw = &adapter->hw;
713
714         /* Setup the Base and Length of the Tx Descriptor Ring 
715          * tx_ring.dma can be either a 32 or 64 bit value 
716          */
717
718         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
719         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
720
721         IXGB_WRITE_REG(hw, TDLEN, tdlen);
722
723         /* Setup the HW Tx Head and Tail descriptor pointers */
724
725         IXGB_WRITE_REG(hw, TDH, 0);
726         IXGB_WRITE_REG(hw, TDT, 0);
727
728         /* don't set up txdctl, it induces performance problems if configured
729          * incorrectly */
730         /* Set the Tx Interrupt Delay register */
731
732         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
733
734         /* Program the Transmit Control Register */
735
736         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
737         IXGB_WRITE_REG(hw, TCTL, tctl);
738
739         /* Setup Transmit Descriptor Settings for this adapter */
740         adapter->tx_cmd_type =
741                 IXGB_TX_DESC_TYPE 
742                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
743 }
744
745 /**
746  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
747  * @adapter: board private structure
748  *
749  * Returns 0 on success, negative on failure
750  **/
751
752 int
753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
754 {
755         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
756         struct pci_dev *pdev = adapter->pdev;
757         int size;
758
759         size = sizeof(struct ixgb_buffer) * rxdr->count;
760         rxdr->buffer_info = vmalloc(size);
761         if(!rxdr->buffer_info) {
762                 DPRINTK(PROBE, ERR,
763                  "Unable to allocate receive descriptor ring\n");
764                 return -ENOMEM;
765         }
766         memset(rxdr->buffer_info, 0, size);
767
768         /* Round up to nearest 4K */
769
770         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
771         rxdr->size = ALIGN(rxdr->size, 4096);
772
773         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
774
775         if(!rxdr->desc) {
776                 vfree(rxdr->buffer_info);
777                 DPRINTK(PROBE, ERR,
778                  "Unable to allocate receive descriptors\n");
779                 return -ENOMEM;
780         }
781         memset(rxdr->desc, 0, rxdr->size);
782
783         rxdr->next_to_clean = 0;
784         rxdr->next_to_use = 0;
785
786         return 0;
787 }
788
789 /**
790  * ixgb_setup_rctl - configure the receive control register
791  * @adapter: Board private structure
792  **/
793
794 static void
795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
796 {
797         uint32_t rctl;
798
799         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
800
801         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
802
803         rctl |=
804                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
805                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
806                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
807
808         rctl |= IXGB_RCTL_SECRC;
809
810         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
811                 rctl |= IXGB_RCTL_BSIZE_2048;
812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
813                 rctl |= IXGB_RCTL_BSIZE_4096;
814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
815                 rctl |= IXGB_RCTL_BSIZE_8192;
816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
817                 rctl |= IXGB_RCTL_BSIZE_16384;
818
819         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
820 }
821
822 /**
823  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
824  * @adapter: board private structure
825  *
826  * Configure the Rx unit of the MAC after a reset.
827  **/
828
829 static void
830 ixgb_configure_rx(struct ixgb_adapter *adapter)
831 {
832         uint64_t rdba = adapter->rx_ring.dma;
833         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
834         struct ixgb_hw *hw = &adapter->hw;
835         uint32_t rctl;
836         uint32_t rxcsum;
837         uint32_t rxdctl;
838
839         /* make sure receives are disabled while setting up the descriptors */
840
841         rctl = IXGB_READ_REG(hw, RCTL);
842         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
843
844         /* set the Receive Delay Timer Register */
845
846         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
847
848         /* Setup the Base and Length of the Rx Descriptor Ring */
849
850         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
851         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
852
853         IXGB_WRITE_REG(hw, RDLEN, rdlen);
854
855         /* Setup the HW Rx Head and Tail Descriptor Pointers */
856         IXGB_WRITE_REG(hw, RDH, 0);
857         IXGB_WRITE_REG(hw, RDT, 0);
858
859         /* set up pre-fetching of receive buffers so we get some before we
860          * run out (default hardware behavior is to run out before fetching
861          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
862          * and the descriptors in hw cache are below PTHRESH.  This avoids
863          * the hardware behavior of fetching <=512 descriptors in a single
864          * burst that pre-empts all other activity, usually causing fifo
865          * overflows. */
866         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
867         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
868                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
869                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
870         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
871
872         /* Enable Receive Checksum Offload for TCP and UDP */
873         if(adapter->rx_csum == TRUE) {
874                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
875                 rxcsum |= IXGB_RXCSUM_TUOFL;
876                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
877         }
878
879         /* Enable Receives */
880
881         IXGB_WRITE_REG(hw, RCTL, rctl);
882 }
883
884 /**
885  * ixgb_free_tx_resources - Free Tx Resources
886  * @adapter: board private structure
887  *
888  * Free all transmit software resources
889  **/
890
891 void
892 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
893 {
894         struct pci_dev *pdev = adapter->pdev;
895
896         ixgb_clean_tx_ring(adapter);
897
898         vfree(adapter->tx_ring.buffer_info);
899         adapter->tx_ring.buffer_info = NULL;
900
901         pci_free_consistent(pdev, adapter->tx_ring.size,
902                             adapter->tx_ring.desc, adapter->tx_ring.dma);
903
904         adapter->tx_ring.desc = NULL;
905 }
906
907 static void
908 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
909                                         struct ixgb_buffer *buffer_info)
910 {
911         struct pci_dev *pdev = adapter->pdev;
912
913         if (buffer_info->dma)
914                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
915                                PCI_DMA_TODEVICE);
916
917         if (buffer_info->skb)
918                 dev_kfree_skb_any(buffer_info->skb);
919
920         buffer_info->skb = NULL;
921         buffer_info->dma = 0;
922         buffer_info->time_stamp = 0;
923         /* these fields must always be initialized in tx
924          * buffer_info->length = 0;
925          * buffer_info->next_to_watch = 0; */
926 }
927
928 /**
929  * ixgb_clean_tx_ring - Free Tx Buffers
930  * @adapter: board private structure
931  **/
932
933 static void
934 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
935 {
936         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
937         struct ixgb_buffer *buffer_info;
938         unsigned long size;
939         unsigned int i;
940
941         /* Free all the Tx ring sk_buffs */
942
943         for(i = 0; i < tx_ring->count; i++) {
944                 buffer_info = &tx_ring->buffer_info[i];
945                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
946         }
947
948         size = sizeof(struct ixgb_buffer) * tx_ring->count;
949         memset(tx_ring->buffer_info, 0, size);
950
951         /* Zero out the descriptor ring */
952
953         memset(tx_ring->desc, 0, tx_ring->size);
954
955         tx_ring->next_to_use = 0;
956         tx_ring->next_to_clean = 0;
957
958         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
959         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
960 }
961
962 /**
963  * ixgb_free_rx_resources - Free Rx Resources
964  * @adapter: board private structure
965  *
966  * Free all receive software resources
967  **/
968
969 void
970 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
971 {
972         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
973         struct pci_dev *pdev = adapter->pdev;
974
975         ixgb_clean_rx_ring(adapter);
976
977         vfree(rx_ring->buffer_info);
978         rx_ring->buffer_info = NULL;
979
980         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
981
982         rx_ring->desc = NULL;
983 }
984
985 /**
986  * ixgb_clean_rx_ring - Free Rx Buffers
987  * @adapter: board private structure
988  **/
989
990 static void
991 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
992 {
993         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
994         struct ixgb_buffer *buffer_info;
995         struct pci_dev *pdev = adapter->pdev;
996         unsigned long size;
997         unsigned int i;
998
999         /* Free all the Rx ring sk_buffs */
1000
1001         for(i = 0; i < rx_ring->count; i++) {
1002                 buffer_info = &rx_ring->buffer_info[i];
1003                 if(buffer_info->skb) {
1004
1005                         pci_unmap_single(pdev,
1006                                          buffer_info->dma,
1007                                          buffer_info->length,
1008                                          PCI_DMA_FROMDEVICE);
1009
1010                         dev_kfree_skb(buffer_info->skb);
1011
1012                         buffer_info->skb = NULL;
1013                 }
1014         }
1015
1016         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1017         memset(rx_ring->buffer_info, 0, size);
1018
1019         /* Zero out the descriptor ring */
1020
1021         memset(rx_ring->desc, 0, rx_ring->size);
1022
1023         rx_ring->next_to_clean = 0;
1024         rx_ring->next_to_use = 0;
1025
1026         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1027         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1028 }
1029
1030 /**
1031  * ixgb_set_mac - Change the Ethernet Address of the NIC
1032  * @netdev: network interface device structure
1033  * @p: pointer to an address structure
1034  *
1035  * Returns 0 on success, negative on failure
1036  **/
1037
1038 static int
1039 ixgb_set_mac(struct net_device *netdev, void *p)
1040 {
1041         struct ixgb_adapter *adapter = netdev_priv(netdev);
1042         struct sockaddr *addr = p;
1043
1044         if(!is_valid_ether_addr(addr->sa_data))
1045                 return -EADDRNOTAVAIL;
1046
1047         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1048
1049         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1050
1051         return 0;
1052 }
1053
1054 /**
1055  * ixgb_set_multi - Multicast and Promiscuous mode set
1056  * @netdev: network interface device structure
1057  *
1058  * The set_multi entry point is called whenever the multicast address
1059  * list or the network interface flags are updated.  This routine is
1060  * responsible for configuring the hardware for proper multicast,
1061  * promiscuous mode, and all-multi behavior.
1062  **/
1063
1064 static void
1065 ixgb_set_multi(struct net_device *netdev)
1066 {
1067         struct ixgb_adapter *adapter = netdev_priv(netdev);
1068         struct ixgb_hw *hw = &adapter->hw;
1069         struct dev_mc_list *mc_ptr;
1070         uint32_t rctl;
1071         int i;
1072
1073         /* Check for Promiscuous and All Multicast modes */
1074
1075         rctl = IXGB_READ_REG(hw, RCTL);
1076
1077         if(netdev->flags & IFF_PROMISC) {
1078                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1079         } else if(netdev->flags & IFF_ALLMULTI) {
1080                 rctl |= IXGB_RCTL_MPE;
1081                 rctl &= ~IXGB_RCTL_UPE;
1082         } else {
1083                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1084         }
1085
1086         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1087                 rctl |= IXGB_RCTL_MPE;
1088                 IXGB_WRITE_REG(hw, RCTL, rctl);
1089         } else {
1090                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1091
1092                 IXGB_WRITE_REG(hw, RCTL, rctl);
1093
1094                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1095                         i++, mc_ptr = mc_ptr->next)
1096                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1097                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1098
1099                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1100         }
1101 }
1102
1103 /**
1104  * ixgb_watchdog - Timer Call-back
1105  * @data: pointer to netdev cast into an unsigned long
1106  **/
1107
1108 static void
1109 ixgb_watchdog(unsigned long data)
1110 {
1111         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1112         struct net_device *netdev = adapter->netdev;
1113         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1114
1115         ixgb_check_for_link(&adapter->hw);
1116
1117         if (ixgb_check_for_bad_link(&adapter->hw)) {
1118                 /* force the reset path */
1119                 netif_stop_queue(netdev);
1120         }
1121
1122         if(adapter->hw.link_up) {
1123                 if(!netif_carrier_ok(netdev)) {
1124                         DPRINTK(LINK, INFO,
1125                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1126                         adapter->link_speed = 10000;
1127                         adapter->link_duplex = FULL_DUPLEX;
1128                         netif_carrier_on(netdev);
1129                         netif_wake_queue(netdev);
1130                 }
1131         } else {
1132                 if(netif_carrier_ok(netdev)) {
1133                         adapter->link_speed = 0;
1134                         adapter->link_duplex = 0;
1135                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1136                         netif_carrier_off(netdev);
1137                         netif_stop_queue(netdev);
1138
1139                 }
1140         }
1141
1142         ixgb_update_stats(adapter);
1143
1144         if(!netif_carrier_ok(netdev)) {
1145                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1146                         /* We've lost link, so the controller stops DMA,
1147                          * but we've got queued Tx work that's never going
1148                          * to get done, so reset controller to flush Tx.
1149                          * (Do the reset outside of interrupt context). */
1150                         schedule_work(&adapter->tx_timeout_task);
1151                 }
1152         }
1153
1154         /* Force detection of hung controller every watchdog period */
1155         adapter->detect_tx_hung = TRUE;
1156
1157         /* generate an interrupt to force clean up of any stragglers */
1158         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1159
1160         /* Reset the timer */
1161         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1162 }
1163
1164 #define IXGB_TX_FLAGS_CSUM              0x00000001
1165 #define IXGB_TX_FLAGS_VLAN              0x00000002
1166 #define IXGB_TX_FLAGS_TSO               0x00000004
1167
1168 static int
1169 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1170 {
1171         struct ixgb_context_desc *context_desc;
1172         unsigned int i;
1173         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1174         uint16_t ipcse, tucse, mss;
1175         int err;
1176
1177         if (likely(skb_is_gso(skb))) {
1178                 struct ixgb_buffer *buffer_info;
1179                 struct iphdr *iph;
1180
1181                 if (skb_header_cloned(skb)) {
1182                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1183                         if (err)
1184                                 return err;
1185                 }
1186
1187                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1188                 mss = skb_shinfo(skb)->gso_size;
1189                 iph = ip_hdr(skb);
1190                 iph->tot_len = 0;
1191                 iph->check = 0;
1192                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1193                                                          iph->daddr, 0,
1194                                                          IPPROTO_TCP, 0);
1195                 ipcss = skb_network_offset(skb);
1196                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1197                 ipcse = skb_transport_offset(skb) - 1;
1198                 tucss = skb_transport_offset(skb);
1199                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1200                 tucse = 0;
1201
1202                 i = adapter->tx_ring.next_to_use;
1203                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1204                 buffer_info = &adapter->tx_ring.buffer_info[i];
1205                 WARN_ON(buffer_info->dma != 0);
1206
1207                 context_desc->ipcss = ipcss;
1208                 context_desc->ipcso = ipcso;
1209                 context_desc->ipcse = cpu_to_le16(ipcse);
1210                 context_desc->tucss = tucss;
1211                 context_desc->tucso = tucso;
1212                 context_desc->tucse = cpu_to_le16(tucse);
1213                 context_desc->mss = cpu_to_le16(mss);
1214                 context_desc->hdr_len = hdr_len;
1215                 context_desc->status = 0;
1216                 context_desc->cmd_type_len = cpu_to_le32(
1217                                                   IXGB_CONTEXT_DESC_TYPE 
1218                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1219                                                 | IXGB_CONTEXT_DESC_CMD_IP
1220                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1221                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1222                                                 | (skb->len - (hdr_len)));
1223
1224
1225                 if(++i == adapter->tx_ring.count) i = 0;
1226                 adapter->tx_ring.next_to_use = i;
1227
1228                 return 1;
1229         }
1230
1231         return 0;
1232 }
1233
1234 static boolean_t
1235 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1236 {
1237         struct ixgb_context_desc *context_desc;
1238         unsigned int i;
1239         uint8_t css, cso;
1240
1241         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1242                 struct ixgb_buffer *buffer_info;
1243                 css = skb_transport_offset(skb);
1244                 cso = css + skb->csum_offset;
1245
1246                 i = adapter->tx_ring.next_to_use;
1247                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1248                 buffer_info = &adapter->tx_ring.buffer_info[i];
1249                 WARN_ON(buffer_info->dma != 0);
1250
1251                 context_desc->tucss = css;
1252                 context_desc->tucso = cso;
1253                 context_desc->tucse = 0;
1254                 /* zero out any previously existing data in one instruction */
1255                 *(uint32_t *)&(context_desc->ipcss) = 0;
1256                 context_desc->status = 0;
1257                 context_desc->hdr_len = 0;
1258                 context_desc->mss = 0;
1259                 context_desc->cmd_type_len =
1260                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1261                                     | IXGB_TX_DESC_CMD_IDE);
1262
1263                 if(++i == adapter->tx_ring.count) i = 0;
1264                 adapter->tx_ring.next_to_use = i;
1265
1266                 return TRUE;
1267         }
1268
1269         return FALSE;
1270 }
1271
1272 #define IXGB_MAX_TXD_PWR        14
1273 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1274
1275 static int
1276 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1277             unsigned int first)
1278 {
1279         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1280         struct ixgb_buffer *buffer_info;
1281         int len = skb->len;
1282         unsigned int offset = 0, size, count = 0, i;
1283         unsigned int mss = skb_shinfo(skb)->gso_size;
1284
1285         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1286         unsigned int f;
1287
1288         len -= skb->data_len;
1289
1290         i = tx_ring->next_to_use;
1291
1292         while(len) {
1293                 buffer_info = &tx_ring->buffer_info[i];
1294                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1295                 /* Workaround for premature desc write-backs
1296                  * in TSO mode.  Append 4-byte sentinel desc */
1297                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1298                         size -= 4;
1299
1300                 buffer_info->length = size;
1301                 WARN_ON(buffer_info->dma != 0);
1302                 buffer_info->dma =
1303                         pci_map_single(adapter->pdev,
1304                                 skb->data + offset,
1305                                 size,
1306                                 PCI_DMA_TODEVICE);
1307                 buffer_info->time_stamp = jiffies;
1308                 buffer_info->next_to_watch = 0;
1309
1310                 len -= size;
1311                 offset += size;
1312                 count++;
1313                 if(++i == tx_ring->count) i = 0;
1314         }
1315
1316         for(f = 0; f < nr_frags; f++) {
1317                 struct skb_frag_struct *frag;
1318
1319                 frag = &skb_shinfo(skb)->frags[f];
1320                 len = frag->size;
1321                 offset = 0;
1322
1323                 while(len) {
1324                         buffer_info = &tx_ring->buffer_info[i];
1325                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1326
1327                         /* Workaround for premature desc write-backs
1328                          * in TSO mode.  Append 4-byte sentinel desc */
1329                         if (unlikely(mss && !nr_frags && size == len
1330                                      && size > 8))
1331                                 size -= 4;
1332
1333                         buffer_info->length = size;
1334                         buffer_info->dma =
1335                                 pci_map_page(adapter->pdev,
1336                                         frag->page,
1337                                         frag->page_offset + offset,
1338                                         size,
1339                                         PCI_DMA_TODEVICE);
1340                         buffer_info->time_stamp = jiffies;
1341                         buffer_info->next_to_watch = 0;
1342
1343                         len -= size;
1344                         offset += size;
1345                         count++;
1346                         if(++i == tx_ring->count) i = 0;
1347                 }
1348         }
1349         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1350         tx_ring->buffer_info[i].skb = skb;
1351         tx_ring->buffer_info[first].next_to_watch = i;
1352
1353         return count;
1354 }
1355
1356 static void
1357 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1358 {
1359         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1360         struct ixgb_tx_desc *tx_desc = NULL;
1361         struct ixgb_buffer *buffer_info;
1362         uint32_t cmd_type_len = adapter->tx_cmd_type;
1363         uint8_t status = 0;
1364         uint8_t popts = 0;
1365         unsigned int i;
1366
1367         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1368                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1369                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1370         }
1371
1372         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1373                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1374
1375         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1376                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1377         }
1378
1379         i = tx_ring->next_to_use;
1380
1381         while(count--) {
1382                 buffer_info = &tx_ring->buffer_info[i];
1383                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1384                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1385                 tx_desc->cmd_type_len =
1386                         cpu_to_le32(cmd_type_len | buffer_info->length);
1387                 tx_desc->status = status;
1388                 tx_desc->popts = popts;
1389                 tx_desc->vlan = cpu_to_le16(vlan_id);
1390
1391                 if(++i == tx_ring->count) i = 0;
1392         }
1393
1394         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1395                                 | IXGB_TX_DESC_CMD_RS );
1396
1397         /* Force memory writes to complete before letting h/w
1398          * know there are new descriptors to fetch.  (Only
1399          * applicable for weak-ordered memory model archs,
1400          * such as IA-64). */
1401         wmb();
1402
1403         tx_ring->next_to_use = i;
1404         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1405 }
1406
1407 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1408 {
1409         struct ixgb_adapter *adapter = netdev_priv(netdev);
1410         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1411
1412         netif_stop_queue(netdev);
1413         /* Herbert's original patch had:
1414          *  smp_mb__after_netif_stop_queue();
1415          * but since that doesn't exist yet, just open code it. */
1416         smp_mb();
1417
1418         /* We need to check again in a case another CPU has just
1419          * made room available. */
1420         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1421                 return -EBUSY;
1422
1423         /* A reprieve! */
1424         netif_start_queue(netdev);
1425         ++adapter->restart_queue;
1426         return 0;
1427 }
1428
1429 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1430                               struct ixgb_desc_ring *tx_ring, int size)
1431 {
1432         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1433                 return 0;
1434         return __ixgb_maybe_stop_tx(netdev, size);
1435 }
1436
1437
1438 /* Tx Descriptors needed, worst case */
1439 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1440                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1441 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1442         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1443         + 1 /* one more needed for sentinel TSO workaround */
1444
1445 static int
1446 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1447 {
1448         struct ixgb_adapter *adapter = netdev_priv(netdev);
1449         unsigned int first;
1450         unsigned int tx_flags = 0;
1451         unsigned long flags;
1452         int vlan_id = 0;
1453         int tso;
1454
1455         if(skb->len <= 0) {
1456                 dev_kfree_skb_any(skb);
1457                 return 0;
1458         }
1459
1460 #ifdef NETIF_F_LLTX
1461         local_irq_save(flags);
1462         if (!spin_trylock(&adapter->tx_lock)) {
1463                 /* Collision - tell upper layer to requeue */
1464                 local_irq_restore(flags);
1465                 return NETDEV_TX_LOCKED;
1466         }
1467 #else
1468         spin_lock_irqsave(&adapter->tx_lock, flags);
1469 #endif
1470
1471         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1472                      DESC_NEEDED))) {
1473                 netif_stop_queue(netdev);
1474                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1475                 return NETDEV_TX_BUSY;
1476         }
1477
1478 #ifndef NETIF_F_LLTX
1479         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1480 #endif
1481
1482         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1483                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1484                 vlan_id = vlan_tx_tag_get(skb);
1485         }
1486
1487         first = adapter->tx_ring.next_to_use;
1488         
1489         tso = ixgb_tso(adapter, skb);
1490         if (tso < 0) {
1491                 dev_kfree_skb_any(skb);
1492 #ifdef NETIF_F_LLTX
1493                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1494 #endif
1495                 return NETDEV_TX_OK;
1496         }
1497
1498         if (likely(tso))
1499                 tx_flags |= IXGB_TX_FLAGS_TSO;
1500         else if(ixgb_tx_csum(adapter, skb))
1501                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1502
1503         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1504                         tx_flags);
1505
1506         netdev->trans_start = jiffies;
1507
1508 #ifdef NETIF_F_LLTX
1509         /* Make sure there is space in the ring for the next send. */
1510         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1511
1512         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1513
1514 #endif
1515         return NETDEV_TX_OK;
1516 }
1517
1518 /**
1519  * ixgb_tx_timeout - Respond to a Tx Hang
1520  * @netdev: network interface device structure
1521  **/
1522
1523 static void
1524 ixgb_tx_timeout(struct net_device *netdev)
1525 {
1526         struct ixgb_adapter *adapter = netdev_priv(netdev);
1527
1528         /* Do the reset outside of interrupt context */
1529         schedule_work(&adapter->tx_timeout_task);
1530 }
1531
1532 static void
1533 ixgb_tx_timeout_task(struct work_struct *work)
1534 {
1535         struct ixgb_adapter *adapter =
1536                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1537
1538         adapter->tx_timeout_count++;
1539         ixgb_down(adapter, TRUE);
1540         ixgb_up(adapter);
1541 }
1542
1543 /**
1544  * ixgb_get_stats - Get System Network Statistics
1545  * @netdev: network interface device structure
1546  *
1547  * Returns the address of the device statistics structure.
1548  * The statistics are actually updated from the timer callback.
1549  **/
1550
1551 static struct net_device_stats *
1552 ixgb_get_stats(struct net_device *netdev)
1553 {
1554         struct ixgb_adapter *adapter = netdev_priv(netdev);
1555
1556         return &adapter->net_stats;
1557 }
1558
1559 /**
1560  * ixgb_change_mtu - Change the Maximum Transfer Unit
1561  * @netdev: network interface device structure
1562  * @new_mtu: new value for maximum frame size
1563  *
1564  * Returns 0 on success, negative on failure
1565  **/
1566
1567 static int
1568 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1569 {
1570         struct ixgb_adapter *adapter = netdev_priv(netdev);
1571         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1572         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1573
1574
1575         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1576            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1577                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1578                 return -EINVAL;
1579         }
1580
1581         adapter->rx_buffer_len = max_frame;
1582
1583         netdev->mtu = new_mtu;
1584
1585         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1586                 ixgb_down(adapter, TRUE);
1587                 ixgb_up(adapter);
1588         }
1589
1590         return 0;
1591 }
1592
1593 /**
1594  * ixgb_update_stats - Update the board statistics counters.
1595  * @adapter: board private structure
1596  **/
1597
1598 void
1599 ixgb_update_stats(struct ixgb_adapter *adapter)
1600 {
1601         struct net_device *netdev = adapter->netdev;
1602         struct pci_dev *pdev = adapter->pdev;
1603
1604         /* Prevent stats update while adapter is being reset */
1605         if (pci_channel_offline(pdev))
1606                 return;
1607
1608         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1609            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1610                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1611                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1612                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1613                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1614
1615                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1616                 /* fix up multicast stats by removing broadcasts */
1617                 if(multi >= bcast)
1618                         multi -= bcast;
1619                 
1620                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1621                 adapter->stats.mprch += (multi >> 32);
1622                 adapter->stats.bprcl += bcast_l; 
1623                 adapter->stats.bprch += bcast_h;
1624         } else {
1625                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1626                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1627                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1628                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1629         }
1630         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1631         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1632         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1633         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1634         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1635         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1636         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1637         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1638         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1639         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1640         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1641         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1642         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1643         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1644         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1645         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1646         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1647         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1648         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1649         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1650         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1651         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1652         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1653         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1654         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1655         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1656         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1657         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1658         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1659         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1660         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1661         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1662         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1663         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1664         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1665         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1666         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1667         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1668         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1669         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1670         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1671         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1672         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1673         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1674         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1675         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1676         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1677         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1678         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1679         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1680         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1681         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1682         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1683         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1684         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1685         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1686
1687         /* Fill out the OS statistics structure */
1688
1689         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1690         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1691         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1692         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1693         adapter->net_stats.multicast = adapter->stats.mprcl;
1694         adapter->net_stats.collisions = 0;
1695
1696         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1697          * with a length in the type/len field */
1698         adapter->net_stats.rx_errors =
1699             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1700             adapter->stats.ruc +
1701             adapter->stats.roc /*+ adapter->stats.rlec */  +
1702             adapter->stats.icbc +
1703             adapter->stats.ecbc + adapter->stats.mpc;
1704
1705         /* see above
1706          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1707          */
1708
1709         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1710         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1711         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1712         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1713
1714         adapter->net_stats.tx_errors = 0;
1715         adapter->net_stats.rx_frame_errors = 0;
1716         adapter->net_stats.tx_aborted_errors = 0;
1717         adapter->net_stats.tx_carrier_errors = 0;
1718         adapter->net_stats.tx_fifo_errors = 0;
1719         adapter->net_stats.tx_heartbeat_errors = 0;
1720         adapter->net_stats.tx_window_errors = 0;
1721 }
1722
1723 #define IXGB_MAX_INTR 10
1724 /**
1725  * ixgb_intr - Interrupt Handler
1726  * @irq: interrupt number
1727  * @data: pointer to a network interface device structure
1728  **/
1729
1730 static irqreturn_t
1731 ixgb_intr(int irq, void *data)
1732 {
1733         struct net_device *netdev = data;
1734         struct ixgb_adapter *adapter = netdev_priv(netdev);
1735         struct ixgb_hw *hw = &adapter->hw;
1736         uint32_t icr = IXGB_READ_REG(hw, ICR);
1737 #ifndef CONFIG_IXGB_NAPI
1738         unsigned int i;
1739 #endif
1740
1741         if(unlikely(!icr))
1742                 return IRQ_NONE;  /* Not our interrupt */
1743
1744         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1745                 mod_timer(&adapter->watchdog_timer, jiffies);
1746         }
1747
1748 #ifdef CONFIG_IXGB_NAPI
1749         if(netif_rx_schedule_prep(netdev)) {
1750
1751                 /* Disable interrupts and register for poll. The flush 
1752                   of the posted write is intentionally left out.
1753                 */
1754
1755                 atomic_inc(&adapter->irq_sem);
1756                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1757                 __netif_rx_schedule(netdev);
1758         }
1759 #else
1760         /* yes, that is actually a & and it is meant to make sure that
1761          * every pass through this for loop checks both receive and
1762          * transmit queues for completed descriptors, intended to
1763          * avoid starvation issues and assist tx/rx fairness. */
1764         for(i = 0; i < IXGB_MAX_INTR; i++)
1765                 if(!ixgb_clean_rx_irq(adapter) &
1766                    !ixgb_clean_tx_irq(adapter))
1767                         break;
1768 #endif 
1769         return IRQ_HANDLED;
1770 }
1771
1772 #ifdef CONFIG_IXGB_NAPI
1773 /**
1774  * ixgb_clean - NAPI Rx polling callback
1775  * @adapter: board private structure
1776  **/
1777
1778 static int
1779 ixgb_clean(struct net_device *netdev, int *budget)
1780 {
1781         struct ixgb_adapter *adapter = netdev_priv(netdev);
1782         int work_to_do = min(*budget, netdev->quota);
1783         int tx_cleaned;
1784         int work_done = 0;
1785
1786         tx_cleaned = ixgb_clean_tx_irq(adapter);
1787         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1788
1789         *budget -= work_done;
1790         netdev->quota -= work_done;
1791
1792         /* if no Tx and not enough Rx work done, exit the polling mode */
1793         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1794                 netif_rx_complete(netdev);
1795                 ixgb_irq_enable(adapter);
1796                 return 0;
1797         }
1798
1799         return 1;
1800 }
1801 #endif
1802
1803 /**
1804  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1805  * @adapter: board private structure
1806  **/
1807
1808 static boolean_t
1809 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1810 {
1811         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1812         struct net_device *netdev = adapter->netdev;
1813         struct ixgb_tx_desc *tx_desc, *eop_desc;
1814         struct ixgb_buffer *buffer_info;
1815         unsigned int i, eop;
1816         boolean_t cleaned = FALSE;
1817
1818         i = tx_ring->next_to_clean;
1819         eop = tx_ring->buffer_info[i].next_to_watch;
1820         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1821
1822         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1823
1824                 for(cleaned = FALSE; !cleaned; ) {
1825                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1826                         buffer_info = &tx_ring->buffer_info[i];
1827
1828                         if (tx_desc->popts
1829                             & (IXGB_TX_DESC_POPTS_TXSM |
1830                                IXGB_TX_DESC_POPTS_IXSM))
1831                                 adapter->hw_csum_tx_good++;
1832
1833                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1834
1835                         *(uint32_t *)&(tx_desc->status) = 0;
1836
1837                         cleaned = (i == eop);
1838                         if(++i == tx_ring->count) i = 0;
1839                 }
1840
1841                 eop = tx_ring->buffer_info[i].next_to_watch;
1842                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1843         }
1844
1845         tx_ring->next_to_clean = i;
1846
1847         if (unlikely(netif_queue_stopped(netdev))) {
1848                 spin_lock(&adapter->tx_lock);
1849                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1850                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1851                         netif_wake_queue(netdev);
1852                 spin_unlock(&adapter->tx_lock);
1853         }
1854
1855         if(adapter->detect_tx_hung) {
1856                 /* detect a transmit hang in hardware, this serializes the
1857                  * check with the clearing of time_stamp and movement of i */
1858                 adapter->detect_tx_hung = FALSE;
1859                 if (tx_ring->buffer_info[eop].dma &&
1860                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1861                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1862                         IXGB_STATUS_TXOFF)) {
1863                         /* detected Tx unit hang */
1864                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1865                                         "  TDH                  <%x>\n"
1866                                         "  TDT                  <%x>\n"
1867                                         "  next_to_use          <%x>\n"
1868                                         "  next_to_clean        <%x>\n"
1869                                         "buffer_info[next_to_clean]\n"
1870                                         "  time_stamp           <%lx>\n"
1871                                         "  next_to_watch        <%x>\n"
1872                                         "  jiffies              <%lx>\n"
1873                                         "  next_to_watch.status <%x>\n",
1874                                 IXGB_READ_REG(&adapter->hw, TDH),
1875                                 IXGB_READ_REG(&adapter->hw, TDT),
1876                                 tx_ring->next_to_use,
1877                                 tx_ring->next_to_clean,
1878                                 tx_ring->buffer_info[eop].time_stamp,
1879                                 eop,
1880                                 jiffies,
1881                                 eop_desc->status);
1882                         netif_stop_queue(netdev);
1883                 }
1884         }
1885
1886         return cleaned;
1887 }
1888
1889 /**
1890  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1891  * @adapter: board private structure
1892  * @rx_desc: receive descriptor
1893  * @sk_buff: socket buffer with received data
1894  **/
1895
1896 static void
1897 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1898                  struct ixgb_rx_desc *rx_desc,
1899                  struct sk_buff *skb)
1900 {
1901         /* Ignore Checksum bit is set OR
1902          * TCP Checksum has not been calculated
1903          */
1904         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1905            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1906                 skb->ip_summed = CHECKSUM_NONE;
1907                 return;
1908         }
1909
1910         /* At this point we know the hardware did the TCP checksum */
1911         /* now look at the TCP checksum error bit */
1912         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1913                 /* let the stack verify checksum errors */
1914                 skb->ip_summed = CHECKSUM_NONE;
1915                 adapter->hw_csum_rx_error++;
1916         } else {
1917                 /* TCP checksum is good */
1918                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1919                 adapter->hw_csum_rx_good++;
1920         }
1921 }
1922
1923 /**
1924  * ixgb_clean_rx_irq - Send received data up the network stack,
1925  * @adapter: board private structure
1926  **/
1927
1928 static boolean_t
1929 #ifdef CONFIG_IXGB_NAPI
1930 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1931 #else
1932 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1933 #endif
1934 {
1935         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1936         struct net_device *netdev = adapter->netdev;
1937         struct pci_dev *pdev = adapter->pdev;
1938         struct ixgb_rx_desc *rx_desc, *next_rxd;
1939         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1940         uint32_t length;
1941         unsigned int i, j;
1942         boolean_t cleaned = FALSE;
1943
1944         i = rx_ring->next_to_clean;
1945         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1946         buffer_info = &rx_ring->buffer_info[i];
1947
1948         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1949                 struct sk_buff *skb, *next_skb;
1950                 u8 status;
1951
1952 #ifdef CONFIG_IXGB_NAPI
1953                 if(*work_done >= work_to_do)
1954                         break;
1955
1956                 (*work_done)++;
1957 #endif
1958                 status = rx_desc->status;
1959                 skb = buffer_info->skb;
1960                 buffer_info->skb = NULL;
1961
1962                 prefetch(skb->data);
1963
1964                 if(++i == rx_ring->count) i = 0;
1965                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1966                 prefetch(next_rxd);
1967
1968                 if((j = i + 1) == rx_ring->count) j = 0;
1969                 next2_buffer = &rx_ring->buffer_info[j];
1970                 prefetch(next2_buffer);
1971
1972                 next_buffer = &rx_ring->buffer_info[i];
1973                 next_skb = next_buffer->skb;
1974                 prefetch(next_skb);
1975
1976                 cleaned = TRUE;
1977
1978                 pci_unmap_single(pdev,
1979                                  buffer_info->dma,
1980                                  buffer_info->length,
1981                                  PCI_DMA_FROMDEVICE);
1982
1983                 length = le16_to_cpu(rx_desc->length);
1984
1985                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1986
1987                         /* All receives must fit into a single buffer */
1988
1989                         IXGB_DBG("Receive packet consumed multiple buffers "
1990                                          "length<%x>\n", length);
1991
1992                         dev_kfree_skb_irq(skb);
1993                         goto rxdesc_done;
1994                 }
1995
1996                 if (unlikely(rx_desc->errors
1997                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1998                                 | IXGB_RX_DESC_ERRORS_P |
1999                                 IXGB_RX_DESC_ERRORS_RXE))) {
2000
2001                         dev_kfree_skb_irq(skb);
2002                         goto rxdesc_done;
2003                 }
2004
2005                 /* code added for copybreak, this should improve
2006                  * performance for small packets with large amounts
2007                  * of reassembly being done in the stack */
2008 #define IXGB_CB_LENGTH 256
2009                 if (length < IXGB_CB_LENGTH) {
2010                         struct sk_buff *new_skb =
2011                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2012                         if (new_skb) {
2013                                 skb_reserve(new_skb, NET_IP_ALIGN);
2014                                 skb_copy_to_linear_data_offset(new_skb,
2015                                                                -NET_IP_ALIGN,
2016                                                                (skb->data -
2017                                                                 NET_IP_ALIGN),
2018                                                                (length +
2019                                                                 NET_IP_ALIGN));
2020                                 /* save the skb in buffer_info as good */
2021                                 buffer_info->skb = skb;
2022                                 skb = new_skb;
2023                         }
2024                 }
2025                 /* end copybreak code */
2026
2027                 /* Good Receive */
2028                 skb_put(skb, length);
2029
2030                 /* Receive Checksum Offload */
2031                 ixgb_rx_checksum(adapter, rx_desc, skb);
2032
2033                 skb->protocol = eth_type_trans(skb, netdev);
2034 #ifdef CONFIG_IXGB_NAPI
2035                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2036                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2037                                 le16_to_cpu(rx_desc->special) &
2038                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2039                 } else {
2040                         netif_receive_skb(skb);
2041                 }
2042 #else /* CONFIG_IXGB_NAPI */
2043                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2044                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2045                                 le16_to_cpu(rx_desc->special) &
2046                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2047                 } else {
2048                         netif_rx(skb);
2049                 }
2050 #endif /* CONFIG_IXGB_NAPI */
2051                 netdev->last_rx = jiffies;
2052
2053 rxdesc_done:
2054                 /* clean up descriptor, might be written over by hw */
2055                 rx_desc->status = 0;
2056
2057                 /* use prefetched values */
2058                 rx_desc = next_rxd;
2059                 buffer_info = next_buffer;
2060         }
2061
2062         rx_ring->next_to_clean = i;
2063
2064         ixgb_alloc_rx_buffers(adapter);
2065
2066         return cleaned;
2067 }
2068
2069 /**
2070  * ixgb_alloc_rx_buffers - Replace used receive buffers
2071  * @adapter: address of board private structure
2072  **/
2073
2074 static void
2075 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2076 {
2077         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2078         struct net_device *netdev = adapter->netdev;
2079         struct pci_dev *pdev = adapter->pdev;
2080         struct ixgb_rx_desc *rx_desc;
2081         struct ixgb_buffer *buffer_info;
2082         struct sk_buff *skb;
2083         unsigned int i;
2084         int num_group_tail_writes;
2085         long cleancount;
2086
2087         i = rx_ring->next_to_use;
2088         buffer_info = &rx_ring->buffer_info[i];
2089         cleancount = IXGB_DESC_UNUSED(rx_ring);
2090
2091         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2092
2093         /* leave three descriptors unused */
2094         while(--cleancount > 2) {
2095                 /* recycle! its good for you */
2096                 skb = buffer_info->skb;
2097                 if (skb) {
2098                         skb_trim(skb, 0);
2099                         goto map_skb;
2100                 }
2101
2102                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2103                                        + NET_IP_ALIGN);
2104                 if (unlikely(!skb)) {
2105                         /* Better luck next round */
2106                         adapter->alloc_rx_buff_failed++;
2107                         break;
2108                 }
2109
2110                 /* Make buffer alignment 2 beyond a 16 byte boundary
2111                  * this will result in a 16 byte aligned IP header after
2112                  * the 14 byte MAC header is removed
2113                  */
2114                 skb_reserve(skb, NET_IP_ALIGN);
2115
2116                 buffer_info->skb = skb;
2117                 buffer_info->length = adapter->rx_buffer_len;
2118 map_skb:
2119                 buffer_info->dma = pci_map_single(pdev,
2120                                                   skb->data,
2121                                                   adapter->rx_buffer_len,
2122                                                   PCI_DMA_FROMDEVICE);
2123
2124                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2125                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2126                 /* guarantee DD bit not set now before h/w gets descriptor
2127                  * this is the rest of the workaround for h/w double 
2128                  * writeback. */
2129                 rx_desc->status = 0;
2130
2131
2132                 if(++i == rx_ring->count) i = 0;
2133                 buffer_info = &rx_ring->buffer_info[i];
2134         }
2135
2136         if (likely(rx_ring->next_to_use != i)) {
2137                 rx_ring->next_to_use = i;
2138                 if (unlikely(i-- == 0))
2139                         i = (rx_ring->count - 1);
2140
2141                 /* Force memory writes to complete before letting h/w
2142                  * know there are new descriptors to fetch.  (Only
2143                  * applicable for weak-ordered memory model archs, such
2144                  * as IA-64). */
2145                 wmb();
2146                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2147         }
2148 }
2149
2150 /**
2151  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2152  * 
2153  * @param netdev network interface device structure
2154  * @param grp indicates to enable or disable tagging/stripping
2155  **/
2156 static void
2157 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2158 {
2159         struct ixgb_adapter *adapter = netdev_priv(netdev);
2160         uint32_t ctrl, rctl;
2161
2162         ixgb_irq_disable(adapter);
2163         adapter->vlgrp = grp;
2164
2165         if(grp) {
2166                 /* enable VLAN tag insert/strip */
2167                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2168                 ctrl |= IXGB_CTRL0_VME;
2169                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2170
2171                 /* enable VLAN receive filtering */
2172
2173                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2174                 rctl |= IXGB_RCTL_VFE;
2175                 rctl &= ~IXGB_RCTL_CFIEN;
2176                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2177         } else {
2178                 /* disable VLAN tag insert/strip */
2179
2180                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2181                 ctrl &= ~IXGB_CTRL0_VME;
2182                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2183
2184                 /* disable VLAN filtering */
2185
2186                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2187                 rctl &= ~IXGB_RCTL_VFE;
2188                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2189         }
2190
2191         ixgb_irq_enable(adapter);
2192 }
2193
2194 static void
2195 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2196 {
2197         struct ixgb_adapter *adapter = netdev_priv(netdev);
2198         uint32_t vfta, index;
2199
2200         /* add VID to filter table */
2201
2202         index = (vid >> 5) & 0x7F;
2203         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2204         vfta |= (1 << (vid & 0x1F));
2205         ixgb_write_vfta(&adapter->hw, index, vfta);
2206 }
2207
2208 static void
2209 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2210 {
2211         struct ixgb_adapter *adapter = netdev_priv(netdev);
2212         uint32_t vfta, index;
2213
2214         ixgb_irq_disable(adapter);
2215
2216         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2217
2218         ixgb_irq_enable(adapter);
2219
2220         /* remove VID from filter table*/
2221
2222         index = (vid >> 5) & 0x7F;
2223         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2224         vfta &= ~(1 << (vid & 0x1F));
2225         ixgb_write_vfta(&adapter->hw, index, vfta);
2226 }
2227
2228 static void
2229 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2230 {
2231         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2232
2233         if(adapter->vlgrp) {
2234                 uint16_t vid;
2235                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2236                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2237                                 continue;
2238                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2239                 }
2240         }
2241 }
2242
2243 #ifdef CONFIG_NET_POLL_CONTROLLER
2244 /*
2245  * Polling 'interrupt' - used by things like netconsole to send skbs
2246  * without having to re-enable interrupts. It's not called while
2247  * the interrupt routine is executing.
2248  */
2249
2250 static void ixgb_netpoll(struct net_device *dev)
2251 {
2252         struct ixgb_adapter *adapter = netdev_priv(dev);
2253
2254         disable_irq(adapter->pdev->irq);
2255         ixgb_intr(adapter->pdev->irq, dev);
2256         enable_irq(adapter->pdev->irq);
2257 }
2258 #endif
2259
2260 /**
2261  * ixgb_io_error_detected() - called when PCI error is detected
2262  * @pdev    pointer to pci device with error
2263  * @state   pci channel state after error
2264  *
2265  * This callback is called by the PCI subsystem whenever
2266  * a PCI bus error is detected.
2267  */
2268 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2269                                      enum pci_channel_state state)
2270 {
2271         struct net_device *netdev = pci_get_drvdata(pdev);
2272         struct ixgb_adapter *adapter = netdev_priv(netdev);
2273
2274         if(netif_running(netdev))
2275                 ixgb_down(adapter, TRUE);
2276
2277         pci_disable_device(pdev);
2278
2279         /* Request a slot reset. */
2280         return PCI_ERS_RESULT_NEED_RESET;
2281 }
2282
2283 /**
2284  * ixgb_io_slot_reset - called after the pci bus has been reset.
2285  * @pdev    pointer to pci device with error
2286  *
2287  * This callback is called after the PCI buss has been reset.
2288  * Basically, this tries to restart the card from scratch.
2289  * This is a shortened version of the device probe/discovery code,
2290  * it resembles the first-half of the ixgb_probe() routine.
2291  */
2292 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2293 {
2294         struct net_device *netdev = pci_get_drvdata(pdev);
2295         struct ixgb_adapter *adapter = netdev_priv(netdev);
2296
2297         if(pci_enable_device(pdev)) {
2298                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2299                 return PCI_ERS_RESULT_DISCONNECT;
2300         }
2301
2302         /* Perform card reset only on one instance of the card */
2303         if (0 != PCI_FUNC (pdev->devfn))
2304                 return PCI_ERS_RESULT_RECOVERED;
2305
2306         pci_set_master(pdev);
2307
2308         netif_carrier_off(netdev);
2309         netif_stop_queue(netdev);
2310         ixgb_reset(adapter);
2311
2312         /* Make sure the EEPROM is good */
2313         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2314                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2315                 return PCI_ERS_RESULT_DISCONNECT;
2316         }
2317         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2318         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2319
2320         if(!is_valid_ether_addr(netdev->perm_addr)) {
2321                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2322                 return PCI_ERS_RESULT_DISCONNECT;
2323         }
2324
2325         return PCI_ERS_RESULT_RECOVERED;
2326 }
2327
2328 /**
2329  * ixgb_io_resume - called when its OK to resume normal operations
2330  * @pdev    pointer to pci device with error
2331  *
2332  * The error recovery driver tells us that its OK to resume
2333  * normal operation. Implementation resembles the second-half
2334  * of the ixgb_probe() routine.
2335  */
2336 static void ixgb_io_resume (struct pci_dev *pdev)
2337 {
2338         struct net_device *netdev = pci_get_drvdata(pdev);
2339         struct ixgb_adapter *adapter = netdev_priv(netdev);
2340
2341         pci_set_master(pdev);
2342
2343         if(netif_running(netdev)) {
2344                 if(ixgb_up(adapter)) {
2345                         printk ("ixgb: can't bring device back up after reset\n");
2346                         return;
2347                 }
2348         }
2349
2350         netif_device_attach(netdev);
2351         mod_timer(&adapter->watchdog_timer, jiffies);
2352 }
2353
2354 /* ixgb_main.c */