ixgb: leave room for extra hardware memory usage
[linux-2.6.git] / 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-k4"DRIVERNAPI
40 const char ixgb_driver_version[] = DRV_VERSION;
41 static const 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, bool 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 bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
98
99 #ifdef CONFIG_IXGB_NAPI
100 static int ixgb_clean(struct napi_struct *napi, int budget);
101 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102                               int *work_done, int work_to_do);
103 #else
104 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 static void ixgb_tx_timeout(struct net_device *dev);
108 static void ixgb_tx_timeout_task(struct work_struct *work);
109 static void ixgb_vlan_rx_register(struct net_device *netdev,
110                                   struct vlan_group *grp);
111 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
112 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
113 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
114
115 #ifdef CONFIG_NET_POLL_CONTROLLER
116 /* for netdump / net console */
117 static void ixgb_netpoll(struct net_device *dev);
118 #endif
119
120 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
121                              enum pci_channel_state state);
122 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
123 static void ixgb_io_resume (struct pci_dev *pdev);
124
125 static struct pci_error_handlers ixgb_err_handler = {
126         .error_detected = ixgb_io_error_detected,
127         .slot_reset = ixgb_io_slot_reset,
128         .resume = ixgb_io_resume,
129 };
130
131 static struct pci_driver ixgb_driver = {
132         .name     = ixgb_driver_name,
133         .id_table = ixgb_pci_tbl,
134         .probe    = ixgb_probe,
135         .remove   = __devexit_p(ixgb_remove),
136         .err_handler = &ixgb_err_handler
137 };
138
139 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
140 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
141 MODULE_LICENSE("GPL");
142 MODULE_VERSION(DRV_VERSION);
143
144 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
145 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
146 module_param(debug, int, 0);
147 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
148
149 /**
150  * ixgb_init_module - Driver Registration Routine
151  *
152  * ixgb_init_module is the first routine called when the driver is
153  * loaded. All it does is register with the PCI subsystem.
154  **/
155
156 static int __init
157 ixgb_init_module(void)
158 {
159         printk(KERN_INFO "%s - version %s\n",
160                ixgb_driver_string, ixgb_driver_version);
161
162         printk(KERN_INFO "%s\n", ixgb_copyright);
163
164         return pci_register_driver(&ixgb_driver);
165 }
166
167 module_init(ixgb_init_module);
168
169 /**
170  * ixgb_exit_module - Driver Exit Cleanup Routine
171  *
172  * ixgb_exit_module is called just before the driver is removed
173  * from memory.
174  **/
175
176 static void __exit
177 ixgb_exit_module(void)
178 {
179         pci_unregister_driver(&ixgb_driver);
180 }
181
182 module_exit(ixgb_exit_module);
183
184 /**
185  * ixgb_irq_disable - Mask off interrupt generation on the NIC
186  * @adapter: board private structure
187  **/
188
189 static void
190 ixgb_irq_disable(struct ixgb_adapter *adapter)
191 {
192         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
193         IXGB_WRITE_FLUSH(&adapter->hw);
194         synchronize_irq(adapter->pdev->irq);
195 }
196
197 /**
198  * ixgb_irq_enable - Enable default interrupt generation settings
199  * @adapter: board private structure
200  **/
201
202 static void
203 ixgb_irq_enable(struct ixgb_adapter *adapter)
204 {
205         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
206                   IXGB_INT_TXDW | IXGB_INT_LSC;
207         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
208                 val |= IXGB_INT_GPI0;
209         IXGB_WRITE_REG(&adapter->hw, IMS, val);
210         IXGB_WRITE_FLUSH(&adapter->hw);
211 }
212
213 int
214 ixgb_up(struct ixgb_adapter *adapter)
215 {
216         struct net_device *netdev = adapter->netdev;
217         int err, irq_flags = IRQF_SHARED;
218         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
219         struct ixgb_hw *hw = &adapter->hw;
220
221         /* hardware has been reset, we need to reload some things */
222
223         ixgb_rar_set(hw, netdev->dev_addr, 0);
224         ixgb_set_multi(netdev);
225
226         ixgb_restore_vlan(adapter);
227
228         ixgb_configure_tx(adapter);
229         ixgb_setup_rctl(adapter);
230         ixgb_configure_rx(adapter);
231         ixgb_alloc_rx_buffers(adapter);
232
233         /* disable interrupts and get the hardware into a known state */
234         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
235
236         /* only enable MSI if bus is in PCI-X mode */
237         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
238                 err = pci_enable_msi(adapter->pdev);
239                 if (!err) {
240                         adapter->have_msi = 1;
241                         irq_flags = 0;
242                 }
243                 /* proceed to try to request regular interrupt */
244         }
245
246         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
247                           netdev->name, netdev);
248         if (err) {
249                 if (adapter->have_msi)
250                         pci_disable_msi(adapter->pdev);
251                 DPRINTK(PROBE, ERR,
252                  "Unable to allocate interrupt Error: %d\n", err);
253                 return err;
254         }
255
256         if((hw->max_frame_size != max_frame) ||
257                 (hw->max_frame_size !=
258                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
259
260                 hw->max_frame_size = max_frame;
261
262                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
263
264                 if(hw->max_frame_size >
265                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
266                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
267
268                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
269                                 ctrl0 |= IXGB_CTRL0_JFE;
270                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
271                         }
272                 }
273         }
274
275         clear_bit(__IXGB_DOWN, &adapter->flags);
276
277 #ifdef CONFIG_IXGB_NAPI
278         napi_enable(&adapter->napi);
279 #endif
280         ixgb_irq_enable(adapter);
281
282         mod_timer(&adapter->watchdog_timer, jiffies);
283
284         return 0;
285 }
286
287 void
288 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
289 {
290         struct net_device *netdev = adapter->netdev;
291
292         /* prevent the interrupt handler from restarting watchdog */
293         set_bit(__IXGB_DOWN, &adapter->flags);
294
295 #ifdef CONFIG_IXGB_NAPI
296         napi_disable(&adapter->napi);
297 #endif
298         /* waiting for NAPI to complete can re-enable interrupts */
299         ixgb_irq_disable(adapter);
300         free_irq(adapter->pdev->irq, netdev);
301
302         if (adapter->have_msi)
303                 pci_disable_msi(adapter->pdev);
304
305         if(kill_watchdog)
306                 del_timer_sync(&adapter->watchdog_timer);
307
308         adapter->link_speed = 0;
309         adapter->link_duplex = 0;
310         netif_carrier_off(netdev);
311         netif_stop_queue(netdev);
312
313         ixgb_reset(adapter);
314         ixgb_clean_tx_ring(adapter);
315         ixgb_clean_rx_ring(adapter);
316 }
317
318 void
319 ixgb_reset(struct ixgb_adapter *adapter)
320 {
321         struct ixgb_hw *hw = &adapter->hw;
322
323         ixgb_adapter_stop(hw);
324         if (!ixgb_init_hw(hw))
325                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
326
327         /* restore frame size information */
328         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
329         if (hw->max_frame_size >
330             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
331                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
332                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
333                         ctrl0 |= IXGB_CTRL0_JFE;
334                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
335                 }
336         }
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         int pci_using_dac;
359         int i;
360         int err;
361
362         if((err = pci_enable_device(pdev)))
363                 return err;
364
365         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
366            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
367                 pci_using_dac = 1;
368         } else {
369                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
370                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
371                         printk(KERN_ERR
372                          "ixgb: No usable DMA configuration, aborting\n");
373                         goto err_dma_mask;
374                 }
375                 pci_using_dac = 0;
376         }
377
378         if((err = pci_request_regions(pdev, ixgb_driver_name)))
379                 goto err_request_regions;
380
381         pci_set_master(pdev);
382
383         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
384         if(!netdev) {
385                 err = -ENOMEM;
386                 goto err_alloc_etherdev;
387         }
388
389         SET_NETDEV_DEV(netdev, &pdev->dev);
390
391         pci_set_drvdata(pdev, netdev);
392         adapter = netdev_priv(netdev);
393         adapter->netdev = netdev;
394         adapter->pdev = pdev;
395         adapter->hw.back = adapter;
396         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
397
398         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
399                                       pci_resource_len(pdev, BAR_0));
400         if (!adapter->hw.hw_addr) {
401                 err = -EIO;
402                 goto err_ioremap;
403         }
404
405         for(i = BAR_1; i <= BAR_5; i++) {
406                 if(pci_resource_len(pdev, i) == 0)
407                         continue;
408                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
409                         adapter->hw.io_base = pci_resource_start(pdev, i);
410                         break;
411                 }
412         }
413
414         netdev->open = &ixgb_open;
415         netdev->stop = &ixgb_close;
416         netdev->hard_start_xmit = &ixgb_xmit_frame;
417         netdev->get_stats = &ixgb_get_stats;
418         netdev->set_multicast_list = &ixgb_set_multi;
419         netdev->set_mac_address = &ixgb_set_mac;
420         netdev->change_mtu = &ixgb_change_mtu;
421         ixgb_set_ethtool_ops(netdev);
422         netdev->tx_timeout = &ixgb_tx_timeout;
423         netdev->watchdog_timeo = 5 * HZ;
424 #ifdef CONFIG_IXGB_NAPI
425         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 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
436         adapter->bd_number = cards_found;
437         adapter->link_speed = 0;
438         adapter->link_duplex = 0;
439
440         /* setup the private structure */
441
442         if((err = ixgb_sw_init(adapter)))
443                 goto err_sw_init;
444
445         netdev->features = NETIF_F_SG |
446                            NETIF_F_HW_CSUM |
447                            NETIF_F_HW_VLAN_TX |
448                            NETIF_F_HW_VLAN_RX |
449                            NETIF_F_HW_VLAN_FILTER;
450         netdev->features |= NETIF_F_TSO;
451 #ifdef NETIF_F_LLTX
452         netdev->features |= NETIF_F_LLTX;
453 #endif
454
455         if(pci_using_dac)
456                 netdev->features |= NETIF_F_HIGHDMA;
457
458         /* make sure the EEPROM is good */
459
460         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
461                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
462                 err = -EIO;
463                 goto err_eeprom;
464         }
465
466         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
467         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
468
469         if(!is_valid_ether_addr(netdev->perm_addr)) {
470                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
471                 err = -EIO;
472                 goto err_eeprom;
473         }
474
475         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
476
477         init_timer(&adapter->watchdog_timer);
478         adapter->watchdog_timer.function = &ixgb_watchdog;
479         adapter->watchdog_timer.data = (unsigned long)adapter;
480
481         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
482
483         strcpy(netdev->name, "eth%d");
484         if((err = register_netdev(netdev)))
485                 goto err_register;
486
487         /* we're going to reset, so assume we have no link for now */
488
489         netif_carrier_off(netdev);
490         netif_stop_queue(netdev);
491
492         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
493         ixgb_check_options(adapter);
494         /* reset the hardware with the new settings */
495
496         ixgb_reset(adapter);
497
498         cards_found++;
499         return 0;
500
501 err_register:
502 err_sw_init:
503 err_eeprom:
504         iounmap(adapter->hw.hw_addr);
505 err_ioremap:
506         free_netdev(netdev);
507 err_alloc_etherdev:
508         pci_release_regions(pdev);
509 err_request_regions:
510 err_dma_mask:
511         pci_disable_device(pdev);
512         return err;
513 }
514
515 /**
516  * ixgb_remove - Device Removal Routine
517  * @pdev: PCI device information struct
518  *
519  * ixgb_remove is called by the PCI subsystem to alert the driver
520  * that it should release a PCI device.  The could be caused by a
521  * Hot-Plug event, or because the driver is going to be removed from
522  * memory.
523  **/
524
525 static void __devexit
526 ixgb_remove(struct pci_dev *pdev)
527 {
528         struct net_device *netdev = pci_get_drvdata(pdev);
529         struct ixgb_adapter *adapter = netdev_priv(netdev);
530
531         unregister_netdev(netdev);
532
533         iounmap(adapter->hw.hw_addr);
534         pci_release_regions(pdev);
535
536         free_netdev(netdev);
537 }
538
539 /**
540  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
541  * @adapter: board private structure to initialize
542  *
543  * ixgb_sw_init initializes the Adapter private data structure.
544  * Fields are initialized based on PCI device information and
545  * OS network device settings (MTU size).
546  **/
547
548 static int __devinit
549 ixgb_sw_init(struct ixgb_adapter *adapter)
550 {
551         struct ixgb_hw *hw = &adapter->hw;
552         struct net_device *netdev = adapter->netdev;
553         struct pci_dev *pdev = adapter->pdev;
554
555         /* PCI config space info */
556
557         hw->vendor_id = pdev->vendor;
558         hw->device_id = pdev->device;
559         hw->subsystem_vendor_id = pdev->subsystem_vendor;
560         hw->subsystem_id = pdev->subsystem_device;
561
562         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
563         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
564
565         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
566            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
567            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
568            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
569                         hw->mac_type = ixgb_82597;
570         else {
571                 /* should never have loaded on this device */
572                 DPRINTK(PROBE, ERR, "unsupported device id\n");
573         }
574
575         /* enable flow control to be programmed */
576         hw->fc.send_xon = 1;
577
578         spin_lock_init(&adapter->tx_lock);
579
580         set_bit(__IXGB_DOWN, &adapter->flags);
581         return 0;
582 }
583
584 /**
585  * ixgb_open - Called when a network interface is made active
586  * @netdev: network interface device structure
587  *
588  * Returns 0 on success, negative value on failure
589  *
590  * The open entry point is called when a network interface is made
591  * active by the system (IFF_UP).  At this point all resources needed
592  * for transmit and receive operations are allocated, the interrupt
593  * handler is registered with the OS, the watchdog timer is started,
594  * and the stack is notified that the interface is ready.
595  **/
596
597 static int
598 ixgb_open(struct net_device *netdev)
599 {
600         struct ixgb_adapter *adapter = netdev_priv(netdev);
601         int err;
602
603         /* allocate transmit descriptors */
604
605         if((err = ixgb_setup_tx_resources(adapter)))
606                 goto err_setup_tx;
607
608         /* allocate receive descriptors */
609
610         if((err = ixgb_setup_rx_resources(adapter)))
611                 goto err_setup_rx;
612
613         if((err = ixgb_up(adapter)))
614                 goto err_up;
615
616         return 0;
617
618 err_up:
619         ixgb_free_rx_resources(adapter);
620 err_setup_rx:
621         ixgb_free_tx_resources(adapter);
622 err_setup_tx:
623         ixgb_reset(adapter);
624
625         return err;
626 }
627
628 /**
629  * ixgb_close - Disables a network interface
630  * @netdev: network interface device structure
631  *
632  * Returns 0, this is not allowed to fail
633  *
634  * The close entry point is called when an interface is de-activated
635  * by the OS.  The hardware is still under the drivers control, but
636  * needs to be disabled.  A global MAC reset is issued to stop the
637  * hardware, and all transmit and receive resources are freed.
638  **/
639
640 static int
641 ixgb_close(struct net_device *netdev)
642 {
643         struct ixgb_adapter *adapter = netdev_priv(netdev);
644
645         ixgb_down(adapter, true);
646
647         ixgb_free_tx_resources(adapter);
648         ixgb_free_rx_resources(adapter);
649
650         return 0;
651 }
652
653 /**
654  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
655  * @adapter: board private structure
656  *
657  * Return 0 on success, negative on failure
658  **/
659
660 int
661 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
662 {
663         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
664         struct pci_dev *pdev = adapter->pdev;
665         int size;
666
667         size = sizeof(struct ixgb_buffer) * txdr->count;
668         txdr->buffer_info = vmalloc(size);
669         if(!txdr->buffer_info) {
670                 DPRINTK(PROBE, ERR,
671                  "Unable to allocate transmit descriptor ring memory\n");
672                 return -ENOMEM;
673         }
674         memset(txdr->buffer_info, 0, size);
675
676         /* round up to nearest 4K */
677
678         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
679         txdr->size = ALIGN(txdr->size, 4096);
680
681         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
682         if(!txdr->desc) {
683                 vfree(txdr->buffer_info);
684                 DPRINTK(PROBE, ERR,
685                  "Unable to allocate transmit descriptor memory\n");
686                 return -ENOMEM;
687         }
688         memset(txdr->desc, 0, txdr->size);
689
690         txdr->next_to_use = 0;
691         txdr->next_to_clean = 0;
692
693         return 0;
694 }
695
696 /**
697  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
698  * @adapter: board private structure
699  *
700  * Configure the Tx unit of the MAC after a reset.
701  **/
702
703 static void
704 ixgb_configure_tx(struct ixgb_adapter *adapter)
705 {
706         u64 tdba = adapter->tx_ring.dma;
707         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
708         u32 tctl;
709         struct ixgb_hw *hw = &adapter->hw;
710
711         /* Setup the Base and Length of the Tx Descriptor Ring 
712          * tx_ring.dma can be either a 32 or 64 bit value 
713          */
714
715         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
716         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
717
718         IXGB_WRITE_REG(hw, TDLEN, tdlen);
719
720         /* Setup the HW Tx Head and Tail descriptor pointers */
721
722         IXGB_WRITE_REG(hw, TDH, 0);
723         IXGB_WRITE_REG(hw, TDT, 0);
724
725         /* don't set up txdctl, it induces performance problems if configured
726          * incorrectly */
727         /* Set the Tx Interrupt Delay register */
728
729         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
730
731         /* Program the Transmit Control Register */
732
733         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
734         IXGB_WRITE_REG(hw, TCTL, tctl);
735
736         /* Setup Transmit Descriptor Settings for this adapter */
737         adapter->tx_cmd_type =
738                 IXGB_TX_DESC_TYPE 
739                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
740 }
741
742 /**
743  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
744  * @adapter: board private structure
745  *
746  * Returns 0 on success, negative on failure
747  **/
748
749 int
750 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
751 {
752         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
753         struct pci_dev *pdev = adapter->pdev;
754         int size;
755
756         size = sizeof(struct ixgb_buffer) * rxdr->count;
757         rxdr->buffer_info = vmalloc(size);
758         if(!rxdr->buffer_info) {
759                 DPRINTK(PROBE, ERR,
760                  "Unable to allocate receive descriptor ring\n");
761                 return -ENOMEM;
762         }
763         memset(rxdr->buffer_info, 0, size);
764
765         /* Round up to nearest 4K */
766
767         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
768         rxdr->size = ALIGN(rxdr->size, 4096);
769
770         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
771
772         if(!rxdr->desc) {
773                 vfree(rxdr->buffer_info);
774                 DPRINTK(PROBE, ERR,
775                  "Unable to allocate receive descriptors\n");
776                 return -ENOMEM;
777         }
778         memset(rxdr->desc, 0, rxdr->size);
779
780         rxdr->next_to_clean = 0;
781         rxdr->next_to_use = 0;
782
783         return 0;
784 }
785
786 /**
787  * ixgb_setup_rctl - configure the receive control register
788  * @adapter: Board private structure
789  **/
790
791 static void
792 ixgb_setup_rctl(struct ixgb_adapter *adapter)
793 {
794         u32 rctl;
795
796         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
797
798         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
799
800         rctl |=
801                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
802                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
803                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
804
805         rctl |= IXGB_RCTL_SECRC;
806
807         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
808                 rctl |= IXGB_RCTL_BSIZE_2048;
809         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
810                 rctl |= IXGB_RCTL_BSIZE_4096;
811         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
812                 rctl |= IXGB_RCTL_BSIZE_8192;
813         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
814                 rctl |= IXGB_RCTL_BSIZE_16384;
815
816         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
817 }
818
819 /**
820  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
821  * @adapter: board private structure
822  *
823  * Configure the Rx unit of the MAC after a reset.
824  **/
825
826 static void
827 ixgb_configure_rx(struct ixgb_adapter *adapter)
828 {
829         u64 rdba = adapter->rx_ring.dma;
830         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
831         struct ixgb_hw *hw = &adapter->hw;
832         u32 rctl;
833         u32 rxcsum;
834
835         /* make sure receives are disabled while setting up the descriptors */
836
837         rctl = IXGB_READ_REG(hw, RCTL);
838         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
839
840         /* set the Receive Delay Timer Register */
841
842         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
843
844         /* Setup the Base and Length of the Rx Descriptor Ring */
845
846         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
847         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
848
849         IXGB_WRITE_REG(hw, RDLEN, rdlen);
850
851         /* Setup the HW Rx Head and Tail Descriptor Pointers */
852         IXGB_WRITE_REG(hw, RDH, 0);
853         IXGB_WRITE_REG(hw, RDT, 0);
854
855         /* due to the hardware errata with RXDCTL, we are unable to use any of
856          * the performance enhancing features of it without causing other
857          * subtle bugs, some of the bugs could include receive length
858          * corruption at high data rates (WTHRESH > 0) and/or receive
859          * descriptor ring irregularites (particularly in hardware cache) */
860         IXGB_WRITE_REG(hw, RXDCTL, 0);
861
862         /* Enable Receive Checksum Offload for TCP and UDP */
863         if (adapter->rx_csum) {
864                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
865                 rxcsum |= IXGB_RXCSUM_TUOFL;
866                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
867         }
868
869         /* Enable Receives */
870
871         IXGB_WRITE_REG(hw, RCTL, rctl);
872 }
873
874 /**
875  * ixgb_free_tx_resources - Free Tx Resources
876  * @adapter: board private structure
877  *
878  * Free all transmit software resources
879  **/
880
881 void
882 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
883 {
884         struct pci_dev *pdev = adapter->pdev;
885
886         ixgb_clean_tx_ring(adapter);
887
888         vfree(adapter->tx_ring.buffer_info);
889         adapter->tx_ring.buffer_info = NULL;
890
891         pci_free_consistent(pdev, adapter->tx_ring.size,
892                             adapter->tx_ring.desc, adapter->tx_ring.dma);
893
894         adapter->tx_ring.desc = NULL;
895 }
896
897 static void
898 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
899                                         struct ixgb_buffer *buffer_info)
900 {
901         struct pci_dev *pdev = adapter->pdev;
902
903         if (buffer_info->dma)
904                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
905                                PCI_DMA_TODEVICE);
906
907         if (buffer_info->skb)
908                 dev_kfree_skb_any(buffer_info->skb);
909
910         buffer_info->skb = NULL;
911         buffer_info->dma = 0;
912         buffer_info->time_stamp = 0;
913         /* these fields must always be initialized in tx
914          * buffer_info->length = 0;
915          * buffer_info->next_to_watch = 0; */
916 }
917
918 /**
919  * ixgb_clean_tx_ring - Free Tx Buffers
920  * @adapter: board private structure
921  **/
922
923 static void
924 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
925 {
926         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
927         struct ixgb_buffer *buffer_info;
928         unsigned long size;
929         unsigned int i;
930
931         /* Free all the Tx ring sk_buffs */
932
933         for(i = 0; i < tx_ring->count; i++) {
934                 buffer_info = &tx_ring->buffer_info[i];
935                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
936         }
937
938         size = sizeof(struct ixgb_buffer) * tx_ring->count;
939         memset(tx_ring->buffer_info, 0, size);
940
941         /* Zero out the descriptor ring */
942
943         memset(tx_ring->desc, 0, tx_ring->size);
944
945         tx_ring->next_to_use = 0;
946         tx_ring->next_to_clean = 0;
947
948         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
949         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
950 }
951
952 /**
953  * ixgb_free_rx_resources - Free Rx Resources
954  * @adapter: board private structure
955  *
956  * Free all receive software resources
957  **/
958
959 void
960 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
961 {
962         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
963         struct pci_dev *pdev = adapter->pdev;
964
965         ixgb_clean_rx_ring(adapter);
966
967         vfree(rx_ring->buffer_info);
968         rx_ring->buffer_info = NULL;
969
970         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
971
972         rx_ring->desc = NULL;
973 }
974
975 /**
976  * ixgb_clean_rx_ring - Free Rx Buffers
977  * @adapter: board private structure
978  **/
979
980 static void
981 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
982 {
983         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
984         struct ixgb_buffer *buffer_info;
985         struct pci_dev *pdev = adapter->pdev;
986         unsigned long size;
987         unsigned int i;
988
989         /* Free all the Rx ring sk_buffs */
990
991         for(i = 0; i < rx_ring->count; i++) {
992                 buffer_info = &rx_ring->buffer_info[i];
993                 if(buffer_info->skb) {
994
995                         pci_unmap_single(pdev,
996                                          buffer_info->dma,
997                                          buffer_info->length,
998                                          PCI_DMA_FROMDEVICE);
999
1000                         dev_kfree_skb(buffer_info->skb);
1001
1002                         buffer_info->skb = NULL;
1003                 }
1004         }
1005
1006         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1007         memset(rx_ring->buffer_info, 0, size);
1008
1009         /* Zero out the descriptor ring */
1010
1011         memset(rx_ring->desc, 0, rx_ring->size);
1012
1013         rx_ring->next_to_clean = 0;
1014         rx_ring->next_to_use = 0;
1015
1016         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1017         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1018 }
1019
1020 /**
1021  * ixgb_set_mac - Change the Ethernet Address of the NIC
1022  * @netdev: network interface device structure
1023  * @p: pointer to an address structure
1024  *
1025  * Returns 0 on success, negative on failure
1026  **/
1027
1028 static int
1029 ixgb_set_mac(struct net_device *netdev, void *p)
1030 {
1031         struct ixgb_adapter *adapter = netdev_priv(netdev);
1032         struct sockaddr *addr = p;
1033
1034         if(!is_valid_ether_addr(addr->sa_data))
1035                 return -EADDRNOTAVAIL;
1036
1037         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1038
1039         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1040
1041         return 0;
1042 }
1043
1044 /**
1045  * ixgb_set_multi - Multicast and Promiscuous mode set
1046  * @netdev: network interface device structure
1047  *
1048  * The set_multi entry point is called whenever the multicast address
1049  * list or the network interface flags are updated.  This routine is
1050  * responsible for configuring the hardware for proper multicast,
1051  * promiscuous mode, and all-multi behavior.
1052  **/
1053
1054 static void
1055 ixgb_set_multi(struct net_device *netdev)
1056 {
1057         struct ixgb_adapter *adapter = netdev_priv(netdev);
1058         struct ixgb_hw *hw = &adapter->hw;
1059         struct dev_mc_list *mc_ptr;
1060         u32 rctl;
1061         int i;
1062
1063         /* Check for Promiscuous and All Multicast modes */
1064
1065         rctl = IXGB_READ_REG(hw, RCTL);
1066
1067         if(netdev->flags & IFF_PROMISC) {
1068                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1069         } else if(netdev->flags & IFF_ALLMULTI) {
1070                 rctl |= IXGB_RCTL_MPE;
1071                 rctl &= ~IXGB_RCTL_UPE;
1072         } else {
1073                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1074         }
1075
1076         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1077                 rctl |= IXGB_RCTL_MPE;
1078                 IXGB_WRITE_REG(hw, RCTL, rctl);
1079         } else {
1080                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1081                             IXGB_ETH_LENGTH_OF_ADDRESS];
1082
1083                 IXGB_WRITE_REG(hw, RCTL, rctl);
1084
1085                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1086                         i++, mc_ptr = mc_ptr->next)
1087                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1088                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1089
1090                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1091         }
1092 }
1093
1094 /**
1095  * ixgb_watchdog - Timer Call-back
1096  * @data: pointer to netdev cast into an unsigned long
1097  **/
1098
1099 static void
1100 ixgb_watchdog(unsigned long data)
1101 {
1102         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1103         struct net_device *netdev = adapter->netdev;
1104         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1105
1106         ixgb_check_for_link(&adapter->hw);
1107
1108         if (ixgb_check_for_bad_link(&adapter->hw)) {
1109                 /* force the reset path */
1110                 netif_stop_queue(netdev);
1111         }
1112
1113         if(adapter->hw.link_up) {
1114                 if(!netif_carrier_ok(netdev)) {
1115                         DPRINTK(LINK, INFO,
1116                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1117                         adapter->link_speed = 10000;
1118                         adapter->link_duplex = FULL_DUPLEX;
1119                         netif_carrier_on(netdev);
1120                         netif_wake_queue(netdev);
1121                 }
1122         } else {
1123                 if(netif_carrier_ok(netdev)) {
1124                         adapter->link_speed = 0;
1125                         adapter->link_duplex = 0;
1126                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1127                         netif_carrier_off(netdev);
1128                         netif_stop_queue(netdev);
1129
1130                 }
1131         }
1132
1133         ixgb_update_stats(adapter);
1134
1135         if(!netif_carrier_ok(netdev)) {
1136                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1137                         /* We've lost link, so the controller stops DMA,
1138                          * but we've got queued Tx work that's never going
1139                          * to get done, so reset controller to flush Tx.
1140                          * (Do the reset outside of interrupt context). */
1141                         schedule_work(&adapter->tx_timeout_task);
1142                 }
1143         }
1144
1145         /* Force detection of hung controller every watchdog period */
1146         adapter->detect_tx_hung = true;
1147
1148         /* generate an interrupt to force clean up of any stragglers */
1149         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1150
1151         /* Reset the timer */
1152         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1153 }
1154
1155 #define IXGB_TX_FLAGS_CSUM              0x00000001
1156 #define IXGB_TX_FLAGS_VLAN              0x00000002
1157 #define IXGB_TX_FLAGS_TSO               0x00000004
1158
1159 static int
1160 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1161 {
1162         struct ixgb_context_desc *context_desc;
1163         unsigned int i;
1164         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1165         u16 ipcse, tucse, mss;
1166         int err;
1167
1168         if (likely(skb_is_gso(skb))) {
1169                 struct ixgb_buffer *buffer_info;
1170                 struct iphdr *iph;
1171
1172                 if (skb_header_cloned(skb)) {
1173                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1174                         if (err)
1175                                 return err;
1176                 }
1177
1178                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1179                 mss = skb_shinfo(skb)->gso_size;
1180                 iph = ip_hdr(skb);
1181                 iph->tot_len = 0;
1182                 iph->check = 0;
1183                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1184                                                          iph->daddr, 0,
1185                                                          IPPROTO_TCP, 0);
1186                 ipcss = skb_network_offset(skb);
1187                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1188                 ipcse = skb_transport_offset(skb) - 1;
1189                 tucss = skb_transport_offset(skb);
1190                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1191                 tucse = 0;
1192
1193                 i = adapter->tx_ring.next_to_use;
1194                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1195                 buffer_info = &adapter->tx_ring.buffer_info[i];
1196                 WARN_ON(buffer_info->dma != 0);
1197
1198                 context_desc->ipcss = ipcss;
1199                 context_desc->ipcso = ipcso;
1200                 context_desc->ipcse = cpu_to_le16(ipcse);
1201                 context_desc->tucss = tucss;
1202                 context_desc->tucso = tucso;
1203                 context_desc->tucse = cpu_to_le16(tucse);
1204                 context_desc->mss = cpu_to_le16(mss);
1205                 context_desc->hdr_len = hdr_len;
1206                 context_desc->status = 0;
1207                 context_desc->cmd_type_len = cpu_to_le32(
1208                                                   IXGB_CONTEXT_DESC_TYPE 
1209                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1210                                                 | IXGB_CONTEXT_DESC_CMD_IP
1211                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1212                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1213                                                 | (skb->len - (hdr_len)));
1214
1215
1216                 if(++i == adapter->tx_ring.count) i = 0;
1217                 adapter->tx_ring.next_to_use = i;
1218
1219                 return 1;
1220         }
1221
1222         return 0;
1223 }
1224
1225 static bool
1226 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1227 {
1228         struct ixgb_context_desc *context_desc;
1229         unsigned int i;
1230         u8 css, cso;
1231
1232         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1233                 struct ixgb_buffer *buffer_info;
1234                 css = skb_transport_offset(skb);
1235                 cso = css + skb->csum_offset;
1236
1237                 i = adapter->tx_ring.next_to_use;
1238                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1239                 buffer_info = &adapter->tx_ring.buffer_info[i];
1240                 WARN_ON(buffer_info->dma != 0);
1241
1242                 context_desc->tucss = css;
1243                 context_desc->tucso = cso;
1244                 context_desc->tucse = 0;
1245                 /* zero out any previously existing data in one instruction */
1246                 *(u32 *)&(context_desc->ipcss) = 0;
1247                 context_desc->status = 0;
1248                 context_desc->hdr_len = 0;
1249                 context_desc->mss = 0;
1250                 context_desc->cmd_type_len =
1251                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252                                     | IXGB_TX_DESC_CMD_IDE);
1253
1254                 if(++i == adapter->tx_ring.count) i = 0;
1255                 adapter->tx_ring.next_to_use = i;
1256
1257                 return true;
1258         }
1259
1260         return false;
1261 }
1262
1263 #define IXGB_MAX_TXD_PWR        14
1264 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1265
1266 static int
1267 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1268             unsigned int first)
1269 {
1270         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1271         struct ixgb_buffer *buffer_info;
1272         int len = skb->len;
1273         unsigned int offset = 0, size, count = 0, i;
1274         unsigned int mss = skb_shinfo(skb)->gso_size;
1275
1276         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1277         unsigned int f;
1278
1279         len -= skb->data_len;
1280
1281         i = tx_ring->next_to_use;
1282
1283         while(len) {
1284                 buffer_info = &tx_ring->buffer_info[i];
1285                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1286                 /* Workaround for premature desc write-backs
1287                  * in TSO mode.  Append 4-byte sentinel desc */
1288                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1289                         size -= 4;
1290
1291                 buffer_info->length = size;
1292                 WARN_ON(buffer_info->dma != 0);
1293                 buffer_info->dma =
1294                         pci_map_single(adapter->pdev,
1295                                 skb->data + offset,
1296                                 size,
1297                                 PCI_DMA_TODEVICE);
1298                 buffer_info->time_stamp = jiffies;
1299                 buffer_info->next_to_watch = 0;
1300
1301                 len -= size;
1302                 offset += size;
1303                 count++;
1304                 if(++i == tx_ring->count) i = 0;
1305         }
1306
1307         for(f = 0; f < nr_frags; f++) {
1308                 struct skb_frag_struct *frag;
1309
1310                 frag = &skb_shinfo(skb)->frags[f];
1311                 len = frag->size;
1312                 offset = 0;
1313
1314                 while(len) {
1315                         buffer_info = &tx_ring->buffer_info[i];
1316                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1317
1318                         /* Workaround for premature desc write-backs
1319                          * in TSO mode.  Append 4-byte sentinel desc */
1320                         if (unlikely(mss && (f == (nr_frags - 1))
1321                                      && size == len && size > 8))
1322                                 size -= 4;
1323
1324                         buffer_info->length = size;
1325                         buffer_info->dma =
1326                                 pci_map_page(adapter->pdev,
1327                                         frag->page,
1328                                         frag->page_offset + offset,
1329                                         size,
1330                                         PCI_DMA_TODEVICE);
1331                         buffer_info->time_stamp = jiffies;
1332                         buffer_info->next_to_watch = 0;
1333
1334                         len -= size;
1335                         offset += size;
1336                         count++;
1337                         if(++i == tx_ring->count) i = 0;
1338                 }
1339         }
1340         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1341         tx_ring->buffer_info[i].skb = skb;
1342         tx_ring->buffer_info[first].next_to_watch = i;
1343
1344         return count;
1345 }
1346
1347 static void
1348 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1349 {
1350         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1351         struct ixgb_tx_desc *tx_desc = NULL;
1352         struct ixgb_buffer *buffer_info;
1353         u32 cmd_type_len = adapter->tx_cmd_type;
1354         u8 status = 0;
1355         u8 popts = 0;
1356         unsigned int i;
1357
1358         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1359                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1360                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1361         }
1362
1363         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1364                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1365
1366         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1367                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1368         }
1369
1370         i = tx_ring->next_to_use;
1371
1372         while(count--) {
1373                 buffer_info = &tx_ring->buffer_info[i];
1374                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1375                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1376                 tx_desc->cmd_type_len =
1377                         cpu_to_le32(cmd_type_len | buffer_info->length);
1378                 tx_desc->status = status;
1379                 tx_desc->popts = popts;
1380                 tx_desc->vlan = cpu_to_le16(vlan_id);
1381
1382                 if(++i == tx_ring->count) i = 0;
1383         }
1384
1385         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1386                                 | IXGB_TX_DESC_CMD_RS );
1387
1388         /* Force memory writes to complete before letting h/w
1389          * know there are new descriptors to fetch.  (Only
1390          * applicable for weak-ordered memory model archs,
1391          * such as IA-64). */
1392         wmb();
1393
1394         tx_ring->next_to_use = i;
1395         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1396 }
1397
1398 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1399 {
1400         struct ixgb_adapter *adapter = netdev_priv(netdev);
1401         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1402
1403         netif_stop_queue(netdev);
1404         /* Herbert's original patch had:
1405          *  smp_mb__after_netif_stop_queue();
1406          * but since that doesn't exist yet, just open code it. */
1407         smp_mb();
1408
1409         /* We need to check again in a case another CPU has just
1410          * made room available. */
1411         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1412                 return -EBUSY;
1413
1414         /* A reprieve! */
1415         netif_start_queue(netdev);
1416         ++adapter->restart_queue;
1417         return 0;
1418 }
1419
1420 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1421                               struct ixgb_desc_ring *tx_ring, int size)
1422 {
1423         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1424                 return 0;
1425         return __ixgb_maybe_stop_tx(netdev, size);
1426 }
1427
1428
1429 /* Tx Descriptors needed, worst case */
1430 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1431                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1432 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1433         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1434         + 1 /* one more needed for sentinel TSO workaround */
1435
1436 static int
1437 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1438 {
1439         struct ixgb_adapter *adapter = netdev_priv(netdev);
1440         unsigned int first;
1441         unsigned int tx_flags = 0;
1442         unsigned long flags;
1443         int vlan_id = 0;
1444         int tso;
1445
1446         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1447                 dev_kfree_skb(skb);
1448                 return NETDEV_TX_OK;
1449         }
1450
1451         if(skb->len <= 0) {
1452                 dev_kfree_skb_any(skb);
1453                 return 0;
1454         }
1455
1456 #ifdef NETIF_F_LLTX
1457         if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
1458                 /* Collision - tell upper layer to requeue */
1459                 local_irq_restore(flags);
1460                 return NETDEV_TX_LOCKED;
1461         }
1462 #else
1463         spin_lock_irqsave(&adapter->tx_lock, flags);
1464 #endif
1465
1466         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1467                      DESC_NEEDED))) {
1468                 netif_stop_queue(netdev);
1469                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1470                 return NETDEV_TX_BUSY;
1471         }
1472
1473 #ifndef NETIF_F_LLTX
1474         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1475 #endif
1476
1477         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1478                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1479                 vlan_id = vlan_tx_tag_get(skb);
1480         }
1481
1482         first = adapter->tx_ring.next_to_use;
1483         
1484         tso = ixgb_tso(adapter, skb);
1485         if (tso < 0) {
1486                 dev_kfree_skb_any(skb);
1487 #ifdef NETIF_F_LLTX
1488                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1489 #endif
1490                 return NETDEV_TX_OK;
1491         }
1492
1493         if (likely(tso))
1494                 tx_flags |= IXGB_TX_FLAGS_TSO;
1495         else if(ixgb_tx_csum(adapter, skb))
1496                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1497
1498         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1499                         tx_flags);
1500
1501         netdev->trans_start = jiffies;
1502
1503 #ifdef NETIF_F_LLTX
1504         /* Make sure there is space in the ring for the next send. */
1505         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1506
1507         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1508
1509 #endif
1510         return NETDEV_TX_OK;
1511 }
1512
1513 /**
1514  * ixgb_tx_timeout - Respond to a Tx Hang
1515  * @netdev: network interface device structure
1516  **/
1517
1518 static void
1519 ixgb_tx_timeout(struct net_device *netdev)
1520 {
1521         struct ixgb_adapter *adapter = netdev_priv(netdev);
1522
1523         /* Do the reset outside of interrupt context */
1524         schedule_work(&adapter->tx_timeout_task);
1525 }
1526
1527 static void
1528 ixgb_tx_timeout_task(struct work_struct *work)
1529 {
1530         struct ixgb_adapter *adapter =
1531                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1532
1533         adapter->tx_timeout_count++;
1534         ixgb_down(adapter, true);
1535         ixgb_up(adapter);
1536 }
1537
1538 /**
1539  * ixgb_get_stats - Get System Network Statistics
1540  * @netdev: network interface device structure
1541  *
1542  * Returns the address of the device statistics structure.
1543  * The statistics are actually updated from the timer callback.
1544  **/
1545
1546 static struct net_device_stats *
1547 ixgb_get_stats(struct net_device *netdev)
1548 {
1549         struct ixgb_adapter *adapter = netdev_priv(netdev);
1550
1551         return &adapter->net_stats;
1552 }
1553
1554 /**
1555  * ixgb_change_mtu - Change the Maximum Transfer Unit
1556  * @netdev: network interface device structure
1557  * @new_mtu: new value for maximum frame size
1558  *
1559  * Returns 0 on success, negative on failure
1560  **/
1561
1562 static int
1563 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1564 {
1565         struct ixgb_adapter *adapter = netdev_priv(netdev);
1566         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1567         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1568
1569
1570         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1571            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1572                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1573                 return -EINVAL;
1574         }
1575
1576         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1577
1578         netdev->mtu = new_mtu;
1579
1580         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1581                 ixgb_down(adapter, true);
1582                 ixgb_up(adapter);
1583         }
1584
1585         return 0;
1586 }
1587
1588 /**
1589  * ixgb_update_stats - Update the board statistics counters.
1590  * @adapter: board private structure
1591  **/
1592
1593 void
1594 ixgb_update_stats(struct ixgb_adapter *adapter)
1595 {
1596         struct net_device *netdev = adapter->netdev;
1597         struct pci_dev *pdev = adapter->pdev;
1598
1599         /* Prevent stats update while adapter is being reset */
1600         if (pci_channel_offline(pdev))
1601                 return;
1602
1603         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1604            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1605                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1606                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1607                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1608                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1609
1610                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1611                 /* fix up multicast stats by removing broadcasts */
1612                 if(multi >= bcast)
1613                         multi -= bcast;
1614                 
1615                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1616                 adapter->stats.mprch += (multi >> 32);
1617                 adapter->stats.bprcl += bcast_l; 
1618                 adapter->stats.bprch += bcast_h;
1619         } else {
1620                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1621                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1622                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1623                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1624         }
1625         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1626         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1627         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1628         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1629         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1630         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1631         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1632         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1633         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1634         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1635         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1636         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1637         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1638         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1639         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1640         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1641         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1642         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1643         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1644         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1645         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1646         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1647         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1648         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1649         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1650         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1651         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1652         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1653         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1654         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1655         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1656         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1657         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1658         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1659         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1660         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1661         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1662         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1663         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1664         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1665         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1666         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1667         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1668         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1669         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1670         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1671         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1672         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1673         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1674         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1675         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1676         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1677         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1678         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1679         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1680         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1681
1682         /* Fill out the OS statistics structure */
1683
1684         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1685         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1686         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1687         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1688         adapter->net_stats.multicast = adapter->stats.mprcl;
1689         adapter->net_stats.collisions = 0;
1690
1691         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1692          * with a length in the type/len field */
1693         adapter->net_stats.rx_errors =
1694             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1695             adapter->stats.ruc +
1696             adapter->stats.roc /*+ adapter->stats.rlec */  +
1697             adapter->stats.icbc +
1698             adapter->stats.ecbc + adapter->stats.mpc;
1699
1700         /* see above
1701          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1702          */
1703
1704         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1705         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1706         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1707         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1708
1709         adapter->net_stats.tx_errors = 0;
1710         adapter->net_stats.rx_frame_errors = 0;
1711         adapter->net_stats.tx_aborted_errors = 0;
1712         adapter->net_stats.tx_carrier_errors = 0;
1713         adapter->net_stats.tx_fifo_errors = 0;
1714         adapter->net_stats.tx_heartbeat_errors = 0;
1715         adapter->net_stats.tx_window_errors = 0;
1716 }
1717
1718 #define IXGB_MAX_INTR 10
1719 /**
1720  * ixgb_intr - Interrupt Handler
1721  * @irq: interrupt number
1722  * @data: pointer to a network interface device structure
1723  **/
1724
1725 static irqreturn_t
1726 ixgb_intr(int irq, void *data)
1727 {
1728         struct net_device *netdev = data;
1729         struct ixgb_adapter *adapter = netdev_priv(netdev);
1730         struct ixgb_hw *hw = &adapter->hw;
1731         u32 icr = IXGB_READ_REG(hw, ICR);
1732 #ifndef CONFIG_IXGB_NAPI
1733         unsigned int i;
1734 #endif
1735
1736         if(unlikely(!icr))
1737                 return IRQ_NONE;  /* Not our interrupt */
1738
1739         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1740                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1741                         mod_timer(&adapter->watchdog_timer, jiffies);
1742
1743 #ifdef CONFIG_IXGB_NAPI
1744         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1745
1746                 /* Disable interrupts and register for poll. The flush 
1747                   of the posted write is intentionally left out.
1748                 */
1749
1750                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1751                 __netif_rx_schedule(netdev, &adapter->napi);
1752         }
1753 #else
1754         /* yes, that is actually a & and it is meant to make sure that
1755          * every pass through this for loop checks both receive and
1756          * transmit queues for completed descriptors, intended to
1757          * avoid starvation issues and assist tx/rx fairness. */
1758         for(i = 0; i < IXGB_MAX_INTR; i++)
1759                 if(!ixgb_clean_rx_irq(adapter) &
1760                    !ixgb_clean_tx_irq(adapter))
1761                         break;
1762 #endif 
1763         return IRQ_HANDLED;
1764 }
1765
1766 #ifdef CONFIG_IXGB_NAPI
1767 /**
1768  * ixgb_clean - NAPI Rx polling callback
1769  * @adapter: board private structure
1770  **/
1771
1772 static int
1773 ixgb_clean(struct napi_struct *napi, int budget)
1774 {
1775         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1776         struct net_device *netdev = adapter->netdev;
1777         int work_done = 0;
1778
1779         ixgb_clean_tx_irq(adapter);
1780         ixgb_clean_rx_irq(adapter, &work_done, budget);
1781
1782         /* If budget not fully consumed, exit the polling mode */
1783         if (work_done < budget) {
1784                 netif_rx_complete(netdev, napi);
1785                 ixgb_irq_enable(adapter);
1786         }
1787
1788         return work_done;
1789 }
1790 #endif
1791
1792 /**
1793  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1794  * @adapter: board private structure
1795  **/
1796
1797 static bool
1798 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1799 {
1800         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1801         struct net_device *netdev = adapter->netdev;
1802         struct ixgb_tx_desc *tx_desc, *eop_desc;
1803         struct ixgb_buffer *buffer_info;
1804         unsigned int i, eop;
1805         bool cleaned = false;
1806
1807         i = tx_ring->next_to_clean;
1808         eop = tx_ring->buffer_info[i].next_to_watch;
1809         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1810
1811         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1812
1813                 for (cleaned = false; !cleaned; ) {
1814                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1815                         buffer_info = &tx_ring->buffer_info[i];
1816
1817                         if (tx_desc->popts
1818                             & (IXGB_TX_DESC_POPTS_TXSM |
1819                                IXGB_TX_DESC_POPTS_IXSM))
1820                                 adapter->hw_csum_tx_good++;
1821
1822                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1823
1824                         *(u32 *)&(tx_desc->status) = 0;
1825
1826                         cleaned = (i == eop);
1827                         if(++i == tx_ring->count) i = 0;
1828                 }
1829
1830                 eop = tx_ring->buffer_info[i].next_to_watch;
1831                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1832         }
1833
1834         tx_ring->next_to_clean = i;
1835
1836         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1837                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1838                 /* Make sure that anybody stopping the queue after this
1839                  * sees the new next_to_clean. */
1840                 smp_mb();
1841
1842                 if (netif_queue_stopped(netdev) &&
1843                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1844                         netif_wake_queue(netdev);
1845                         ++adapter->restart_queue;
1846                 }
1847         }
1848
1849         if(adapter->detect_tx_hung) {
1850                 /* detect a transmit hang in hardware, this serializes the
1851                  * check with the clearing of time_stamp and movement of i */
1852                 adapter->detect_tx_hung = false;
1853                 if (tx_ring->buffer_info[eop].dma &&
1854                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1855                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1856                         IXGB_STATUS_TXOFF)) {
1857                         /* detected Tx unit hang */
1858                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1859                                         "  TDH                  <%x>\n"
1860                                         "  TDT                  <%x>\n"
1861                                         "  next_to_use          <%x>\n"
1862                                         "  next_to_clean        <%x>\n"
1863                                         "buffer_info[next_to_clean]\n"
1864                                         "  time_stamp           <%lx>\n"
1865                                         "  next_to_watch        <%x>\n"
1866                                         "  jiffies              <%lx>\n"
1867                                         "  next_to_watch.status <%x>\n",
1868                                 IXGB_READ_REG(&adapter->hw, TDH),
1869                                 IXGB_READ_REG(&adapter->hw, TDT),
1870                                 tx_ring->next_to_use,
1871                                 tx_ring->next_to_clean,
1872                                 tx_ring->buffer_info[eop].time_stamp,
1873                                 eop,
1874                                 jiffies,
1875                                 eop_desc->status);
1876                         netif_stop_queue(netdev);
1877                 }
1878         }
1879
1880         return cleaned;
1881 }
1882
1883 /**
1884  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1885  * @adapter: board private structure
1886  * @rx_desc: receive descriptor
1887  * @sk_buff: socket buffer with received data
1888  **/
1889
1890 static void
1891 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1892                  struct ixgb_rx_desc *rx_desc,
1893                  struct sk_buff *skb)
1894 {
1895         /* Ignore Checksum bit is set OR
1896          * TCP Checksum has not been calculated
1897          */
1898         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1899            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1900                 skb->ip_summed = CHECKSUM_NONE;
1901                 return;
1902         }
1903
1904         /* At this point we know the hardware did the TCP checksum */
1905         /* now look at the TCP checksum error bit */
1906         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1907                 /* let the stack verify checksum errors */
1908                 skb->ip_summed = CHECKSUM_NONE;
1909                 adapter->hw_csum_rx_error++;
1910         } else {
1911                 /* TCP checksum is good */
1912                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1913                 adapter->hw_csum_rx_good++;
1914         }
1915 }
1916
1917 /**
1918  * ixgb_clean_rx_irq - Send received data up the network stack,
1919  * @adapter: board private structure
1920  **/
1921
1922 static bool
1923 #ifdef CONFIG_IXGB_NAPI
1924 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1925 #else
1926 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1927 #endif
1928 {
1929         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1930         struct net_device *netdev = adapter->netdev;
1931         struct pci_dev *pdev = adapter->pdev;
1932         struct ixgb_rx_desc *rx_desc, *next_rxd;
1933         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1934         u32 length;
1935         unsigned int i, j;
1936         bool cleaned = false;
1937
1938         i = rx_ring->next_to_clean;
1939         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1940         buffer_info = &rx_ring->buffer_info[i];
1941
1942         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1943                 struct sk_buff *skb, *next_skb;
1944                 u8 status;
1945
1946 #ifdef CONFIG_IXGB_NAPI
1947                 if(*work_done >= work_to_do)
1948                         break;
1949
1950                 (*work_done)++;
1951 #endif
1952                 status = rx_desc->status;
1953                 skb = buffer_info->skb;
1954                 buffer_info->skb = NULL;
1955
1956                 prefetch(skb->data);
1957
1958                 if(++i == rx_ring->count) i = 0;
1959                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1960                 prefetch(next_rxd);
1961
1962                 if((j = i + 1) == rx_ring->count) j = 0;
1963                 next2_buffer = &rx_ring->buffer_info[j];
1964                 prefetch(next2_buffer);
1965
1966                 next_buffer = &rx_ring->buffer_info[i];
1967                 next_skb = next_buffer->skb;
1968                 prefetch(next_skb);
1969
1970                 cleaned = true;
1971
1972                 pci_unmap_single(pdev,
1973                                  buffer_info->dma,
1974                                  buffer_info->length,
1975                                  PCI_DMA_FROMDEVICE);
1976
1977                 length = le16_to_cpu(rx_desc->length);
1978
1979                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1980
1981                         /* All receives must fit into a single buffer */
1982
1983                         IXGB_DBG("Receive packet consumed multiple buffers "
1984                                          "length<%x>\n", length);
1985
1986                         dev_kfree_skb_irq(skb);
1987                         goto rxdesc_done;
1988                 }
1989
1990                 if (unlikely(rx_desc->errors
1991                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1992                                 | IXGB_RX_DESC_ERRORS_P |
1993                                 IXGB_RX_DESC_ERRORS_RXE))) {
1994
1995                         dev_kfree_skb_irq(skb);
1996                         goto rxdesc_done;
1997                 }
1998
1999                 /* code added for copybreak, this should improve
2000                  * performance for small packets with large amounts
2001                  * of reassembly being done in the stack */
2002 #define IXGB_CB_LENGTH 256
2003                 if (length < IXGB_CB_LENGTH) {
2004                         struct sk_buff *new_skb =
2005                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2006                         if (new_skb) {
2007                                 skb_reserve(new_skb, NET_IP_ALIGN);
2008                                 skb_copy_to_linear_data_offset(new_skb,
2009                                                                -NET_IP_ALIGN,
2010                                                                (skb->data -
2011                                                                 NET_IP_ALIGN),
2012                                                                (length +
2013                                                                 NET_IP_ALIGN));
2014                                 /* save the skb in buffer_info as good */
2015                                 buffer_info->skb = skb;
2016                                 skb = new_skb;
2017                         }
2018                 }
2019                 /* end copybreak code */
2020
2021                 /* Good Receive */
2022                 skb_put(skb, length);
2023
2024                 /* Receive Checksum Offload */
2025                 ixgb_rx_checksum(adapter, rx_desc, skb);
2026
2027                 skb->protocol = eth_type_trans(skb, netdev);
2028 #ifdef CONFIG_IXGB_NAPI
2029                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2030                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2031                                 le16_to_cpu(rx_desc->special));
2032                 } else {
2033                         netif_receive_skb(skb);
2034                 }
2035 #else /* CONFIG_IXGB_NAPI */
2036                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2037                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2038                                 le16_to_cpu(rx_desc->special));
2039                 } else {
2040                         netif_rx(skb);
2041                 }
2042 #endif /* CONFIG_IXGB_NAPI */
2043                 netdev->last_rx = jiffies;
2044
2045 rxdesc_done:
2046                 /* clean up descriptor, might be written over by hw */
2047                 rx_desc->status = 0;
2048
2049                 /* use prefetched values */
2050                 rx_desc = next_rxd;
2051                 buffer_info = next_buffer;
2052         }
2053
2054         rx_ring->next_to_clean = i;
2055
2056         ixgb_alloc_rx_buffers(adapter);
2057
2058         return cleaned;
2059 }
2060
2061 /**
2062  * ixgb_alloc_rx_buffers - Replace used receive buffers
2063  * @adapter: address of board private structure
2064  **/
2065
2066 static void
2067 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2068 {
2069         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2070         struct net_device *netdev = adapter->netdev;
2071         struct pci_dev *pdev = adapter->pdev;
2072         struct ixgb_rx_desc *rx_desc;
2073         struct ixgb_buffer *buffer_info;
2074         struct sk_buff *skb;
2075         unsigned int i;
2076         long cleancount;
2077
2078         i = rx_ring->next_to_use;
2079         buffer_info = &rx_ring->buffer_info[i];
2080         cleancount = IXGB_DESC_UNUSED(rx_ring);
2081
2082
2083         /* leave three descriptors unused */
2084         while(--cleancount > 2) {
2085                 /* recycle! its good for you */
2086                 skb = buffer_info->skb;
2087                 if (skb) {
2088                         skb_trim(skb, 0);
2089                         goto map_skb;
2090                 }
2091
2092                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2093                                        + NET_IP_ALIGN);
2094                 if (unlikely(!skb)) {
2095                         /* Better luck next round */
2096                         adapter->alloc_rx_buff_failed++;
2097                         break;
2098                 }
2099
2100                 /* Make buffer alignment 2 beyond a 16 byte boundary
2101                  * this will result in a 16 byte aligned IP header after
2102                  * the 14 byte MAC header is removed
2103                  */
2104                 skb_reserve(skb, NET_IP_ALIGN);
2105
2106                 buffer_info->skb = skb;
2107                 buffer_info->length = adapter->rx_buffer_len;
2108 map_skb:
2109                 buffer_info->dma = pci_map_single(pdev,
2110                                                   skb->data,
2111                                                   adapter->rx_buffer_len,
2112                                                   PCI_DMA_FROMDEVICE);
2113
2114                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2115                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2116                 /* guarantee DD bit not set now before h/w gets descriptor
2117                  * this is the rest of the workaround for h/w double 
2118                  * writeback. */
2119                 rx_desc->status = 0;
2120
2121
2122                 if(++i == rx_ring->count) i = 0;
2123                 buffer_info = &rx_ring->buffer_info[i];
2124         }
2125
2126         if (likely(rx_ring->next_to_use != i)) {
2127                 rx_ring->next_to_use = i;
2128                 if (unlikely(i-- == 0))
2129                         i = (rx_ring->count - 1);
2130
2131                 /* Force memory writes to complete before letting h/w
2132                  * know there are new descriptors to fetch.  (Only
2133                  * applicable for weak-ordered memory model archs, such
2134                  * as IA-64). */
2135                 wmb();
2136                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2137         }
2138 }
2139
2140 /**
2141  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2142  * 
2143  * @param netdev network interface device structure
2144  * @param grp indicates to enable or disable tagging/stripping
2145  **/
2146 static void
2147 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2148 {
2149         struct ixgb_adapter *adapter = netdev_priv(netdev);
2150         u32 ctrl, rctl;
2151
2152         ixgb_irq_disable(adapter);
2153         adapter->vlgrp = grp;
2154
2155         if(grp) {
2156                 /* enable VLAN tag insert/strip */
2157                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158                 ctrl |= IXGB_CTRL0_VME;
2159                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160
2161                 /* enable VLAN receive filtering */
2162
2163                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2164                 rctl |= IXGB_RCTL_VFE;
2165                 rctl &= ~IXGB_RCTL_CFIEN;
2166                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2167         } else {
2168                 /* disable VLAN tag insert/strip */
2169
2170                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2171                 ctrl &= ~IXGB_CTRL0_VME;
2172                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2173
2174                 /* disable VLAN filtering */
2175
2176                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2177                 rctl &= ~IXGB_RCTL_VFE;
2178                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2179         }
2180
2181         /* don't enable interrupts unless we are UP */
2182         if (adapter->netdev->flags & IFF_UP)
2183                 ixgb_irq_enable(adapter);
2184 }
2185
2186 static void
2187 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2188 {
2189         struct ixgb_adapter *adapter = netdev_priv(netdev);
2190         u32 vfta, index;
2191
2192         /* add VID to filter table */
2193
2194         index = (vid >> 5) & 0x7F;
2195         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2196         vfta |= (1 << (vid & 0x1F));
2197         ixgb_write_vfta(&adapter->hw, index, vfta);
2198 }
2199
2200 static void
2201 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2202 {
2203         struct ixgb_adapter *adapter = netdev_priv(netdev);
2204         u32 vfta, index;
2205
2206         ixgb_irq_disable(adapter);
2207
2208         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2209
2210         /* don't enable interrupts unless we are UP */
2211         if (adapter->netdev->flags & IFF_UP)
2212                 ixgb_irq_enable(adapter);
2213
2214         /* remove VID from filter table */
2215
2216         index = (vid >> 5) & 0x7F;
2217         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2218         vfta &= ~(1 << (vid & 0x1F));
2219         ixgb_write_vfta(&adapter->hw, index, vfta);
2220 }
2221
2222 static void
2223 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2224 {
2225         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2226
2227         if(adapter->vlgrp) {
2228                 u16 vid;
2229                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2230                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2231                                 continue;
2232                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2233                 }
2234         }
2235 }
2236
2237 #ifdef CONFIG_NET_POLL_CONTROLLER
2238 /*
2239  * Polling 'interrupt' - used by things like netconsole to send skbs
2240  * without having to re-enable interrupts. It's not called while
2241  * the interrupt routine is executing.
2242  */
2243
2244 static void ixgb_netpoll(struct net_device *dev)
2245 {
2246         struct ixgb_adapter *adapter = netdev_priv(dev);
2247
2248         disable_irq(adapter->pdev->irq);
2249         ixgb_intr(adapter->pdev->irq, dev);
2250         enable_irq(adapter->pdev->irq);
2251 }
2252 #endif
2253
2254 /**
2255  * ixgb_io_error_detected() - called when PCI error is detected
2256  * @pdev    pointer to pci device with error
2257  * @state   pci channel state after error
2258  *
2259  * This callback is called by the PCI subsystem whenever
2260  * a PCI bus error is detected.
2261  */
2262 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2263                                      enum pci_channel_state state)
2264 {
2265         struct net_device *netdev = pci_get_drvdata(pdev);
2266         struct ixgb_adapter *adapter = netdev_priv(netdev);
2267
2268         if(netif_running(netdev))
2269                 ixgb_down(adapter, true);
2270
2271         pci_disable_device(pdev);
2272
2273         /* Request a slot reset. */
2274         return PCI_ERS_RESULT_NEED_RESET;
2275 }
2276
2277 /**
2278  * ixgb_io_slot_reset - called after the pci bus has been reset.
2279  * @pdev    pointer to pci device with error
2280  *
2281  * This callback is called after the PCI buss has been reset.
2282  * Basically, this tries to restart the card from scratch.
2283  * This is a shortened version of the device probe/discovery code,
2284  * it resembles the first-half of the ixgb_probe() routine.
2285  */
2286 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2287 {
2288         struct net_device *netdev = pci_get_drvdata(pdev);
2289         struct ixgb_adapter *adapter = netdev_priv(netdev);
2290
2291         if(pci_enable_device(pdev)) {
2292                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2293                 return PCI_ERS_RESULT_DISCONNECT;
2294         }
2295
2296         /* Perform card reset only on one instance of the card */
2297         if (0 != PCI_FUNC (pdev->devfn))
2298                 return PCI_ERS_RESULT_RECOVERED;
2299
2300         pci_set_master(pdev);
2301
2302         netif_carrier_off(netdev);
2303         netif_stop_queue(netdev);
2304         ixgb_reset(adapter);
2305
2306         /* Make sure the EEPROM is good */
2307         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2308                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2309                 return PCI_ERS_RESULT_DISCONNECT;
2310         }
2311         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2312         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2313
2314         if(!is_valid_ether_addr(netdev->perm_addr)) {
2315                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2316                 return PCI_ERS_RESULT_DISCONNECT;
2317         }
2318
2319         return PCI_ERS_RESULT_RECOVERED;
2320 }
2321
2322 /**
2323  * ixgb_io_resume - called when its OK to resume normal operations
2324  * @pdev    pointer to pci device with error
2325  *
2326  * The error recovery driver tells us that its OK to resume
2327  * normal operation. Implementation resembles the second-half
2328  * of the ixgb_probe() routine.
2329  */
2330 static void ixgb_io_resume (struct pci_dev *pdev)
2331 {
2332         struct net_device *netdev = pci_get_drvdata(pdev);
2333         struct ixgb_adapter *adapter = netdev_priv(netdev);
2334
2335         pci_set_master(pdev);
2336
2337         if(netif_running(netdev)) {
2338                 if(ixgb_up(adapter)) {
2339                         printk ("ixgb: can't bring device back up after reset\n");
2340                         return;
2341                 }
2342         }
2343
2344         netif_device_attach(netdev);
2345         mod_timer(&adapter->watchdog_timer, jiffies);
2346 }
2347
2348 /* ixgb_main.c */