ixgb: repeat 32 bit ioremap cleanup
[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 /* some defines for controlling descriptor fetches in h/w */
150 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
151 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
152                                     * this */
153 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
154                                     * is pushed this many descriptors
155                                     * from head */
156
157 /**
158  * ixgb_init_module - Driver Registration Routine
159  *
160  * ixgb_init_module is the first routine called when the driver is
161  * loaded. All it does is register with the PCI subsystem.
162  **/
163
164 static int __init
165 ixgb_init_module(void)
166 {
167         printk(KERN_INFO "%s - version %s\n",
168                ixgb_driver_string, ixgb_driver_version);
169
170         printk(KERN_INFO "%s\n", ixgb_copyright);
171
172         return pci_register_driver(&ixgb_driver);
173 }
174
175 module_init(ixgb_init_module);
176
177 /**
178  * ixgb_exit_module - Driver Exit Cleanup Routine
179  *
180  * ixgb_exit_module is called just before the driver is removed
181  * from memory.
182  **/
183
184 static void __exit
185 ixgb_exit_module(void)
186 {
187         pci_unregister_driver(&ixgb_driver);
188 }
189
190 module_exit(ixgb_exit_module);
191
192 /**
193  * ixgb_irq_disable - Mask off interrupt generation on the NIC
194  * @adapter: board private structure
195  **/
196
197 static void
198 ixgb_irq_disable(struct ixgb_adapter *adapter)
199 {
200         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
201         IXGB_WRITE_FLUSH(&adapter->hw);
202         synchronize_irq(adapter->pdev->irq);
203 }
204
205 /**
206  * ixgb_irq_enable - Enable default interrupt generation settings
207  * @adapter: board private structure
208  **/
209
210 static void
211 ixgb_irq_enable(struct ixgb_adapter *adapter)
212 {
213         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
214                   IXGB_INT_TXDW | IXGB_INT_LSC;
215         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
216                 val |= IXGB_INT_GPI0;
217         IXGB_WRITE_REG(&adapter->hw, IMS, val);
218         IXGB_WRITE_FLUSH(&adapter->hw);
219 }
220
221 int
222 ixgb_up(struct ixgb_adapter *adapter)
223 {
224         struct net_device *netdev = adapter->netdev;
225         int err, irq_flags = IRQF_SHARED;
226         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
227         struct ixgb_hw *hw = &adapter->hw;
228
229         /* hardware has been reset, we need to reload some things */
230
231         ixgb_rar_set(hw, netdev->dev_addr, 0);
232         ixgb_set_multi(netdev);
233
234         ixgb_restore_vlan(adapter);
235
236         ixgb_configure_tx(adapter);
237         ixgb_setup_rctl(adapter);
238         ixgb_configure_rx(adapter);
239         ixgb_alloc_rx_buffers(adapter);
240
241         /* disable interrupts and get the hardware into a known state */
242         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
243
244         /* only enable MSI if bus is in PCI-X mode */
245         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
246                 err = pci_enable_msi(adapter->pdev);
247                 if (!err) {
248                         adapter->have_msi = 1;
249                         irq_flags = 0;
250                 }
251                 /* proceed to try to request regular interrupt */
252         }
253
254         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
255                           netdev->name, netdev);
256         if (err) {
257                 if (adapter->have_msi)
258                         pci_disable_msi(adapter->pdev);
259                 DPRINTK(PROBE, ERR,
260                  "Unable to allocate interrupt Error: %d\n", err);
261                 return err;
262         }
263
264         if((hw->max_frame_size != max_frame) ||
265                 (hw->max_frame_size !=
266                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
267
268                 hw->max_frame_size = max_frame;
269
270                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
271
272                 if(hw->max_frame_size >
273                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
274                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
275
276                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
277                                 ctrl0 |= IXGB_CTRL0_JFE;
278                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
279                         }
280                 }
281         }
282
283         clear_bit(__IXGB_DOWN, &adapter->flags);
284
285 #ifdef CONFIG_IXGB_NAPI
286         napi_enable(&adapter->napi);
287 #endif
288         ixgb_irq_enable(adapter);
289
290         mod_timer(&adapter->watchdog_timer, jiffies);
291
292         return 0;
293 }
294
295 void
296 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
297 {
298         struct net_device *netdev = adapter->netdev;
299
300         /* prevent the interrupt handler from restarting watchdog */
301         set_bit(__IXGB_DOWN, &adapter->flags);
302
303 #ifdef CONFIG_IXGB_NAPI
304         napi_disable(&adapter->napi);
305 #endif
306         /* waiting for NAPI to complete can re-enable interrupts */
307         ixgb_irq_disable(adapter);
308         free_irq(adapter->pdev->irq, netdev);
309
310         if (adapter->have_msi)
311                 pci_disable_msi(adapter->pdev);
312
313         if(kill_watchdog)
314                 del_timer_sync(&adapter->watchdog_timer);
315
316         adapter->link_speed = 0;
317         adapter->link_duplex = 0;
318         netif_carrier_off(netdev);
319         netif_stop_queue(netdev);
320
321         ixgb_reset(adapter);
322         ixgb_clean_tx_ring(adapter);
323         ixgb_clean_rx_ring(adapter);
324 }
325
326 void
327 ixgb_reset(struct ixgb_adapter *adapter)
328 {
329         struct ixgb_hw *hw = &adapter->hw;
330
331         ixgb_adapter_stop(hw);
332         if (!ixgb_init_hw(hw))
333                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
334
335         /* restore frame size information */
336         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
337         if (hw->max_frame_size >
338             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
339                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
340                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
341                         ctrl0 |= IXGB_CTRL0_JFE;
342                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
343                 }
344         }
345 }
346
347 /**
348  * ixgb_probe - Device Initialization Routine
349  * @pdev: PCI device information struct
350  * @ent: entry in ixgb_pci_tbl
351  *
352  * Returns 0 on success, negative on failure
353  *
354  * ixgb_probe initializes an adapter identified by a pci_dev structure.
355  * The OS initialization, configuring of the adapter private structure,
356  * and a hardware reset occur.
357  **/
358
359 static int __devinit
360 ixgb_probe(struct pci_dev *pdev,
361                 const struct pci_device_id *ent)
362 {
363         struct net_device *netdev = NULL;
364         struct ixgb_adapter *adapter;
365         static int cards_found = 0;
366         int pci_using_dac;
367         int i;
368         int err;
369
370         if((err = pci_enable_device(pdev)))
371                 return err;
372
373         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
374            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
375                 pci_using_dac = 1;
376         } else {
377                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
378                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
379                         printk(KERN_ERR
380                          "ixgb: No usable DMA configuration, aborting\n");
381                         goto err_dma_mask;
382                 }
383                 pci_using_dac = 0;
384         }
385
386         if((err = pci_request_regions(pdev, ixgb_driver_name)))
387                 goto err_request_regions;
388
389         pci_set_master(pdev);
390
391         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
392         if(!netdev) {
393                 err = -ENOMEM;
394                 goto err_alloc_etherdev;
395         }
396
397         SET_NETDEV_DEV(netdev, &pdev->dev);
398
399         pci_set_drvdata(pdev, netdev);
400         adapter = netdev_priv(netdev);
401         adapter->netdev = netdev;
402         adapter->pdev = pdev;
403         adapter->hw.back = adapter;
404         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
405
406         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
407                                       pci_resource_len(pdev, BAR_0));
408         if (!adapter->hw.hw_addr) {
409                 err = -EIO;
410                 goto err_ioremap;
411         }
412
413         for(i = BAR_1; i <= BAR_5; i++) {
414                 if(pci_resource_len(pdev, i) == 0)
415                         continue;
416                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
417                         adapter->hw.io_base = pci_resource_start(pdev, i);
418                         break;
419                 }
420         }
421
422         netdev->open = &ixgb_open;
423         netdev->stop = &ixgb_close;
424         netdev->hard_start_xmit = &ixgb_xmit_frame;
425         netdev->get_stats = &ixgb_get_stats;
426         netdev->set_multicast_list = &ixgb_set_multi;
427         netdev->set_mac_address = &ixgb_set_mac;
428         netdev->change_mtu = &ixgb_change_mtu;
429         ixgb_set_ethtool_ops(netdev);
430         netdev->tx_timeout = &ixgb_tx_timeout;
431         netdev->watchdog_timeo = 5 * HZ;
432 #ifdef CONFIG_IXGB_NAPI
433         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
434 #endif
435         netdev->vlan_rx_register = ixgb_vlan_rx_register;
436         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
437         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
438 #ifdef CONFIG_NET_POLL_CONTROLLER
439         netdev->poll_controller = ixgb_netpoll;
440 #endif
441
442         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
443
444         adapter->bd_number = cards_found;
445         adapter->link_speed = 0;
446         adapter->link_duplex = 0;
447
448         /* setup the private structure */
449
450         if((err = ixgb_sw_init(adapter)))
451                 goto err_sw_init;
452
453         netdev->features = NETIF_F_SG |
454                            NETIF_F_HW_CSUM |
455                            NETIF_F_HW_VLAN_TX |
456                            NETIF_F_HW_VLAN_RX |
457                            NETIF_F_HW_VLAN_FILTER;
458         netdev->features |= NETIF_F_TSO;
459 #ifdef NETIF_F_LLTX
460         netdev->features |= NETIF_F_LLTX;
461 #endif
462
463         if(pci_using_dac)
464                 netdev->features |= NETIF_F_HIGHDMA;
465
466         /* make sure the EEPROM is good */
467
468         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
469                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
470                 err = -EIO;
471                 goto err_eeprom;
472         }
473
474         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
475         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
476
477         if(!is_valid_ether_addr(netdev->perm_addr)) {
478                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
479                 err = -EIO;
480                 goto err_eeprom;
481         }
482
483         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
484
485         init_timer(&adapter->watchdog_timer);
486         adapter->watchdog_timer.function = &ixgb_watchdog;
487         adapter->watchdog_timer.data = (unsigned long)adapter;
488
489         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
490
491         strcpy(netdev->name, "eth%d");
492         if((err = register_netdev(netdev)))
493                 goto err_register;
494
495         /* we're going to reset, so assume we have no link for now */
496
497         netif_carrier_off(netdev);
498         netif_stop_queue(netdev);
499
500         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
501         ixgb_check_options(adapter);
502         /* reset the hardware with the new settings */
503
504         ixgb_reset(adapter);
505
506         cards_found++;
507         return 0;
508
509 err_register:
510 err_sw_init:
511 err_eeprom:
512         iounmap(adapter->hw.hw_addr);
513 err_ioremap:
514         free_netdev(netdev);
515 err_alloc_etherdev:
516         pci_release_regions(pdev);
517 err_request_regions:
518 err_dma_mask:
519         pci_disable_device(pdev);
520         return err;
521 }
522
523 /**
524  * ixgb_remove - Device Removal Routine
525  * @pdev: PCI device information struct
526  *
527  * ixgb_remove is called by the PCI subsystem to alert the driver
528  * that it should release a PCI device.  The could be caused by a
529  * Hot-Plug event, or because the driver is going to be removed from
530  * memory.
531  **/
532
533 static void __devexit
534 ixgb_remove(struct pci_dev *pdev)
535 {
536         struct net_device *netdev = pci_get_drvdata(pdev);
537         struct ixgb_adapter *adapter = netdev_priv(netdev);
538
539         unregister_netdev(netdev);
540
541         iounmap(adapter->hw.hw_addr);
542         pci_release_regions(pdev);
543
544         free_netdev(netdev);
545 }
546
547 /**
548  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
549  * @adapter: board private structure to initialize
550  *
551  * ixgb_sw_init initializes the Adapter private data structure.
552  * Fields are initialized based on PCI device information and
553  * OS network device settings (MTU size).
554  **/
555
556 static int __devinit
557 ixgb_sw_init(struct ixgb_adapter *adapter)
558 {
559         struct ixgb_hw *hw = &adapter->hw;
560         struct net_device *netdev = adapter->netdev;
561         struct pci_dev *pdev = adapter->pdev;
562
563         /* PCI config space info */
564
565         hw->vendor_id = pdev->vendor;
566         hw->device_id = pdev->device;
567         hw->subsystem_vendor_id = pdev->subsystem_vendor;
568         hw->subsystem_id = pdev->subsystem_device;
569
570         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
571         adapter->rx_buffer_len = hw->max_frame_size;
572
573         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
574            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
575            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
576            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
577                         hw->mac_type = ixgb_82597;
578         else {
579                 /* should never have loaded on this device */
580                 DPRINTK(PROBE, ERR, "unsupported device id\n");
581         }
582
583         /* enable flow control to be programmed */
584         hw->fc.send_xon = 1;
585
586         spin_lock_init(&adapter->tx_lock);
587
588         set_bit(__IXGB_DOWN, &adapter->flags);
589         return 0;
590 }
591
592 /**
593  * ixgb_open - Called when a network interface is made active
594  * @netdev: network interface device structure
595  *
596  * Returns 0 on success, negative value on failure
597  *
598  * The open entry point is called when a network interface is made
599  * active by the system (IFF_UP).  At this point all resources needed
600  * for transmit and receive operations are allocated, the interrupt
601  * handler is registered with the OS, the watchdog timer is started,
602  * and the stack is notified that the interface is ready.
603  **/
604
605 static int
606 ixgb_open(struct net_device *netdev)
607 {
608         struct ixgb_adapter *adapter = netdev_priv(netdev);
609         int err;
610
611         /* allocate transmit descriptors */
612
613         if((err = ixgb_setup_tx_resources(adapter)))
614                 goto err_setup_tx;
615
616         /* allocate receive descriptors */
617
618         if((err = ixgb_setup_rx_resources(adapter)))
619                 goto err_setup_rx;
620
621         if((err = ixgb_up(adapter)))
622                 goto err_up;
623
624         return 0;
625
626 err_up:
627         ixgb_free_rx_resources(adapter);
628 err_setup_rx:
629         ixgb_free_tx_resources(adapter);
630 err_setup_tx:
631         ixgb_reset(adapter);
632
633         return err;
634 }
635
636 /**
637  * ixgb_close - Disables a network interface
638  * @netdev: network interface device structure
639  *
640  * Returns 0, this is not allowed to fail
641  *
642  * The close entry point is called when an interface is de-activated
643  * by the OS.  The hardware is still under the drivers control, but
644  * needs to be disabled.  A global MAC reset is issued to stop the
645  * hardware, and all transmit and receive resources are freed.
646  **/
647
648 static int
649 ixgb_close(struct net_device *netdev)
650 {
651         struct ixgb_adapter *adapter = netdev_priv(netdev);
652
653         ixgb_down(adapter, true);
654
655         ixgb_free_tx_resources(adapter);
656         ixgb_free_rx_resources(adapter);
657
658         return 0;
659 }
660
661 /**
662  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
663  * @adapter: board private structure
664  *
665  * Return 0 on success, negative on failure
666  **/
667
668 int
669 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
670 {
671         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
672         struct pci_dev *pdev = adapter->pdev;
673         int size;
674
675         size = sizeof(struct ixgb_buffer) * txdr->count;
676         txdr->buffer_info = vmalloc(size);
677         if(!txdr->buffer_info) {
678                 DPRINTK(PROBE, ERR,
679                  "Unable to allocate transmit descriptor ring memory\n");
680                 return -ENOMEM;
681         }
682         memset(txdr->buffer_info, 0, size);
683
684         /* round up to nearest 4K */
685
686         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
687         txdr->size = ALIGN(txdr->size, 4096);
688
689         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
690         if(!txdr->desc) {
691                 vfree(txdr->buffer_info);
692                 DPRINTK(PROBE, ERR,
693                  "Unable to allocate transmit descriptor memory\n");
694                 return -ENOMEM;
695         }
696         memset(txdr->desc, 0, txdr->size);
697
698         txdr->next_to_use = 0;
699         txdr->next_to_clean = 0;
700
701         return 0;
702 }
703
704 /**
705  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
706  * @adapter: board private structure
707  *
708  * Configure the Tx unit of the MAC after a reset.
709  **/
710
711 static void
712 ixgb_configure_tx(struct ixgb_adapter *adapter)
713 {
714         u64 tdba = adapter->tx_ring.dma;
715         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
716         u32 tctl;
717         struct ixgb_hw *hw = &adapter->hw;
718
719         /* Setup the Base and Length of the Tx Descriptor Ring 
720          * tx_ring.dma can be either a 32 or 64 bit value 
721          */
722
723         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
724         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
725
726         IXGB_WRITE_REG(hw, TDLEN, tdlen);
727
728         /* Setup the HW Tx Head and Tail descriptor pointers */
729
730         IXGB_WRITE_REG(hw, TDH, 0);
731         IXGB_WRITE_REG(hw, TDT, 0);
732
733         /* don't set up txdctl, it induces performance problems if configured
734          * incorrectly */
735         /* Set the Tx Interrupt Delay register */
736
737         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
738
739         /* Program the Transmit Control Register */
740
741         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
742         IXGB_WRITE_REG(hw, TCTL, tctl);
743
744         /* Setup Transmit Descriptor Settings for this adapter */
745         adapter->tx_cmd_type =
746                 IXGB_TX_DESC_TYPE 
747                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
748 }
749
750 /**
751  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
752  * @adapter: board private structure
753  *
754  * Returns 0 on success, negative on failure
755  **/
756
757 int
758 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
759 {
760         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
761         struct pci_dev *pdev = adapter->pdev;
762         int size;
763
764         size = sizeof(struct ixgb_buffer) * rxdr->count;
765         rxdr->buffer_info = vmalloc(size);
766         if(!rxdr->buffer_info) {
767                 DPRINTK(PROBE, ERR,
768                  "Unable to allocate receive descriptor ring\n");
769                 return -ENOMEM;
770         }
771         memset(rxdr->buffer_info, 0, size);
772
773         /* Round up to nearest 4K */
774
775         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
776         rxdr->size = ALIGN(rxdr->size, 4096);
777
778         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
779
780         if(!rxdr->desc) {
781                 vfree(rxdr->buffer_info);
782                 DPRINTK(PROBE, ERR,
783                  "Unable to allocate receive descriptors\n");
784                 return -ENOMEM;
785         }
786         memset(rxdr->desc, 0, rxdr->size);
787
788         rxdr->next_to_clean = 0;
789         rxdr->next_to_use = 0;
790
791         return 0;
792 }
793
794 /**
795  * ixgb_setup_rctl - configure the receive control register
796  * @adapter: Board private structure
797  **/
798
799 static void
800 ixgb_setup_rctl(struct ixgb_adapter *adapter)
801 {
802         u32 rctl;
803
804         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
805
806         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
807
808         rctl |=
809                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
810                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
811                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
812
813         rctl |= IXGB_RCTL_SECRC;
814
815         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
816                 rctl |= IXGB_RCTL_BSIZE_2048;
817         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
818                 rctl |= IXGB_RCTL_BSIZE_4096;
819         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
820                 rctl |= IXGB_RCTL_BSIZE_8192;
821         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
822                 rctl |= IXGB_RCTL_BSIZE_16384;
823
824         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
825 }
826
827 /**
828  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
829  * @adapter: board private structure
830  *
831  * Configure the Rx unit of the MAC after a reset.
832  **/
833
834 static void
835 ixgb_configure_rx(struct ixgb_adapter *adapter)
836 {
837         u64 rdba = adapter->rx_ring.dma;
838         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
839         struct ixgb_hw *hw = &adapter->hw;
840         u32 rctl;
841         u32 rxcsum;
842         u32 rxdctl;
843
844         /* make sure receives are disabled while setting up the descriptors */
845
846         rctl = IXGB_READ_REG(hw, RCTL);
847         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
848
849         /* set the Receive Delay Timer Register */
850
851         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
852
853         /* Setup the Base and Length of the Rx Descriptor Ring */
854
855         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
856         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
857
858         IXGB_WRITE_REG(hw, RDLEN, rdlen);
859
860         /* Setup the HW Rx Head and Tail Descriptor Pointers */
861         IXGB_WRITE_REG(hw, RDH, 0);
862         IXGB_WRITE_REG(hw, RDT, 0);
863
864         /* set up pre-fetching of receive buffers so we get some before we
865          * run out (default hardware behavior is to run out before fetching
866          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
867          * and the descriptors in hw cache are below PTHRESH.  This avoids
868          * the hardware behavior of fetching <=512 descriptors in a single
869          * burst that pre-empts all other activity, usually causing fifo
870          * overflows. */
871         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
872         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
873                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
874                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
875         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
876
877         /* Enable Receive Checksum Offload for TCP and UDP */
878         if (adapter->rx_csum) {
879                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
880                 rxcsum |= IXGB_RXCSUM_TUOFL;
881                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
882         }
883
884         /* Enable Receives */
885
886         IXGB_WRITE_REG(hw, RCTL, rctl);
887 }
888
889 /**
890  * ixgb_free_tx_resources - Free Tx Resources
891  * @adapter: board private structure
892  *
893  * Free all transmit software resources
894  **/
895
896 void
897 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
898 {
899         struct pci_dev *pdev = adapter->pdev;
900
901         ixgb_clean_tx_ring(adapter);
902
903         vfree(adapter->tx_ring.buffer_info);
904         adapter->tx_ring.buffer_info = NULL;
905
906         pci_free_consistent(pdev, adapter->tx_ring.size,
907                             adapter->tx_ring.desc, adapter->tx_ring.dma);
908
909         adapter->tx_ring.desc = NULL;
910 }
911
912 static void
913 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
914                                         struct ixgb_buffer *buffer_info)
915 {
916         struct pci_dev *pdev = adapter->pdev;
917
918         if (buffer_info->dma)
919                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
920                                PCI_DMA_TODEVICE);
921
922         if (buffer_info->skb)
923                 dev_kfree_skb_any(buffer_info->skb);
924
925         buffer_info->skb = NULL;
926         buffer_info->dma = 0;
927         buffer_info->time_stamp = 0;
928         /* these fields must always be initialized in tx
929          * buffer_info->length = 0;
930          * buffer_info->next_to_watch = 0; */
931 }
932
933 /**
934  * ixgb_clean_tx_ring - Free Tx Buffers
935  * @adapter: board private structure
936  **/
937
938 static void
939 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
940 {
941         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
942         struct ixgb_buffer *buffer_info;
943         unsigned long size;
944         unsigned int i;
945
946         /* Free all the Tx ring sk_buffs */
947
948         for(i = 0; i < tx_ring->count; i++) {
949                 buffer_info = &tx_ring->buffer_info[i];
950                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
951         }
952
953         size = sizeof(struct ixgb_buffer) * tx_ring->count;
954         memset(tx_ring->buffer_info, 0, size);
955
956         /* Zero out the descriptor ring */
957
958         memset(tx_ring->desc, 0, tx_ring->size);
959
960         tx_ring->next_to_use = 0;
961         tx_ring->next_to_clean = 0;
962
963         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
964         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
965 }
966
967 /**
968  * ixgb_free_rx_resources - Free Rx Resources
969  * @adapter: board private structure
970  *
971  * Free all receive software resources
972  **/
973
974 void
975 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
976 {
977         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
978         struct pci_dev *pdev = adapter->pdev;
979
980         ixgb_clean_rx_ring(adapter);
981
982         vfree(rx_ring->buffer_info);
983         rx_ring->buffer_info = NULL;
984
985         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
986
987         rx_ring->desc = NULL;
988 }
989
990 /**
991  * ixgb_clean_rx_ring - Free Rx Buffers
992  * @adapter: board private structure
993  **/
994
995 static void
996 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
997 {
998         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
999         struct ixgb_buffer *buffer_info;
1000         struct pci_dev *pdev = adapter->pdev;
1001         unsigned long size;
1002         unsigned int i;
1003
1004         /* Free all the Rx ring sk_buffs */
1005
1006         for(i = 0; i < rx_ring->count; i++) {
1007                 buffer_info = &rx_ring->buffer_info[i];
1008                 if(buffer_info->skb) {
1009
1010                         pci_unmap_single(pdev,
1011                                          buffer_info->dma,
1012                                          buffer_info->length,
1013                                          PCI_DMA_FROMDEVICE);
1014
1015                         dev_kfree_skb(buffer_info->skb);
1016
1017                         buffer_info->skb = NULL;
1018                 }
1019         }
1020
1021         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1022         memset(rx_ring->buffer_info, 0, size);
1023
1024         /* Zero out the descriptor ring */
1025
1026         memset(rx_ring->desc, 0, rx_ring->size);
1027
1028         rx_ring->next_to_clean = 0;
1029         rx_ring->next_to_use = 0;
1030
1031         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1032         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1033 }
1034
1035 /**
1036  * ixgb_set_mac - Change the Ethernet Address of the NIC
1037  * @netdev: network interface device structure
1038  * @p: pointer to an address structure
1039  *
1040  * Returns 0 on success, negative on failure
1041  **/
1042
1043 static int
1044 ixgb_set_mac(struct net_device *netdev, void *p)
1045 {
1046         struct ixgb_adapter *adapter = netdev_priv(netdev);
1047         struct sockaddr *addr = p;
1048
1049         if(!is_valid_ether_addr(addr->sa_data))
1050                 return -EADDRNOTAVAIL;
1051
1052         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1053
1054         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1055
1056         return 0;
1057 }
1058
1059 /**
1060  * ixgb_set_multi - Multicast and Promiscuous mode set
1061  * @netdev: network interface device structure
1062  *
1063  * The set_multi entry point is called whenever the multicast address
1064  * list or the network interface flags are updated.  This routine is
1065  * responsible for configuring the hardware for proper multicast,
1066  * promiscuous mode, and all-multi behavior.
1067  **/
1068
1069 static void
1070 ixgb_set_multi(struct net_device *netdev)
1071 {
1072         struct ixgb_adapter *adapter = netdev_priv(netdev);
1073         struct ixgb_hw *hw = &adapter->hw;
1074         struct dev_mc_list *mc_ptr;
1075         u32 rctl;
1076         int i;
1077
1078         /* Check for Promiscuous and All Multicast modes */
1079
1080         rctl = IXGB_READ_REG(hw, RCTL);
1081
1082         if(netdev->flags & IFF_PROMISC) {
1083                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1084         } else if(netdev->flags & IFF_ALLMULTI) {
1085                 rctl |= IXGB_RCTL_MPE;
1086                 rctl &= ~IXGB_RCTL_UPE;
1087         } else {
1088                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1089         }
1090
1091         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1092                 rctl |= IXGB_RCTL_MPE;
1093                 IXGB_WRITE_REG(hw, RCTL, rctl);
1094         } else {
1095                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1096                             IXGB_ETH_LENGTH_OF_ADDRESS];
1097
1098                 IXGB_WRITE_REG(hw, RCTL, rctl);
1099
1100                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1101                         i++, mc_ptr = mc_ptr->next)
1102                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1103                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1104
1105                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1106         }
1107 }
1108
1109 /**
1110  * ixgb_watchdog - Timer Call-back
1111  * @data: pointer to netdev cast into an unsigned long
1112  **/
1113
1114 static void
1115 ixgb_watchdog(unsigned long data)
1116 {
1117         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1118         struct net_device *netdev = adapter->netdev;
1119         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1120
1121         ixgb_check_for_link(&adapter->hw);
1122
1123         if (ixgb_check_for_bad_link(&adapter->hw)) {
1124                 /* force the reset path */
1125                 netif_stop_queue(netdev);
1126         }
1127
1128         if(adapter->hw.link_up) {
1129                 if(!netif_carrier_ok(netdev)) {
1130                         DPRINTK(LINK, INFO,
1131                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1132                         adapter->link_speed = 10000;
1133                         adapter->link_duplex = FULL_DUPLEX;
1134                         netif_carrier_on(netdev);
1135                         netif_wake_queue(netdev);
1136                 }
1137         } else {
1138                 if(netif_carrier_ok(netdev)) {
1139                         adapter->link_speed = 0;
1140                         adapter->link_duplex = 0;
1141                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1142                         netif_carrier_off(netdev);
1143                         netif_stop_queue(netdev);
1144
1145                 }
1146         }
1147
1148         ixgb_update_stats(adapter);
1149
1150         if(!netif_carrier_ok(netdev)) {
1151                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1152                         /* We've lost link, so the controller stops DMA,
1153                          * but we've got queued Tx work that's never going
1154                          * to get done, so reset controller to flush Tx.
1155                          * (Do the reset outside of interrupt context). */
1156                         schedule_work(&adapter->tx_timeout_task);
1157                 }
1158         }
1159
1160         /* Force detection of hung controller every watchdog period */
1161         adapter->detect_tx_hung = true;
1162
1163         /* generate an interrupt to force clean up of any stragglers */
1164         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1165
1166         /* Reset the timer */
1167         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1168 }
1169
1170 #define IXGB_TX_FLAGS_CSUM              0x00000001
1171 #define IXGB_TX_FLAGS_VLAN              0x00000002
1172 #define IXGB_TX_FLAGS_TSO               0x00000004
1173
1174 static int
1175 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1176 {
1177         struct ixgb_context_desc *context_desc;
1178         unsigned int i;
1179         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1180         u16 ipcse, tucse, mss;
1181         int err;
1182
1183         if (likely(skb_is_gso(skb))) {
1184                 struct ixgb_buffer *buffer_info;
1185                 struct iphdr *iph;
1186
1187                 if (skb_header_cloned(skb)) {
1188                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1189                         if (err)
1190                                 return err;
1191                 }
1192
1193                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1194                 mss = skb_shinfo(skb)->gso_size;
1195                 iph = ip_hdr(skb);
1196                 iph->tot_len = 0;
1197                 iph->check = 0;
1198                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1199                                                          iph->daddr, 0,
1200                                                          IPPROTO_TCP, 0);
1201                 ipcss = skb_network_offset(skb);
1202                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1203                 ipcse = skb_transport_offset(skb) - 1;
1204                 tucss = skb_transport_offset(skb);
1205                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1206                 tucse = 0;
1207
1208                 i = adapter->tx_ring.next_to_use;
1209                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1210                 buffer_info = &adapter->tx_ring.buffer_info[i];
1211                 WARN_ON(buffer_info->dma != 0);
1212
1213                 context_desc->ipcss = ipcss;
1214                 context_desc->ipcso = ipcso;
1215                 context_desc->ipcse = cpu_to_le16(ipcse);
1216                 context_desc->tucss = tucss;
1217                 context_desc->tucso = tucso;
1218                 context_desc->tucse = cpu_to_le16(tucse);
1219                 context_desc->mss = cpu_to_le16(mss);
1220                 context_desc->hdr_len = hdr_len;
1221                 context_desc->status = 0;
1222                 context_desc->cmd_type_len = cpu_to_le32(
1223                                                   IXGB_CONTEXT_DESC_TYPE 
1224                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1225                                                 | IXGB_CONTEXT_DESC_CMD_IP
1226                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1227                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1228                                                 | (skb->len - (hdr_len)));
1229
1230
1231                 if(++i == adapter->tx_ring.count) i = 0;
1232                 adapter->tx_ring.next_to_use = i;
1233
1234                 return 1;
1235         }
1236
1237         return 0;
1238 }
1239
1240 static bool
1241 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1242 {
1243         struct ixgb_context_desc *context_desc;
1244         unsigned int i;
1245         u8 css, cso;
1246
1247         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1248                 struct ixgb_buffer *buffer_info;
1249                 css = skb_transport_offset(skb);
1250                 cso = css + skb->csum_offset;
1251
1252                 i = adapter->tx_ring.next_to_use;
1253                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1254                 buffer_info = &adapter->tx_ring.buffer_info[i];
1255                 WARN_ON(buffer_info->dma != 0);
1256
1257                 context_desc->tucss = css;
1258                 context_desc->tucso = cso;
1259                 context_desc->tucse = 0;
1260                 /* zero out any previously existing data in one instruction */
1261                 *(u32 *)&(context_desc->ipcss) = 0;
1262                 context_desc->status = 0;
1263                 context_desc->hdr_len = 0;
1264                 context_desc->mss = 0;
1265                 context_desc->cmd_type_len =
1266                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1267                                     | IXGB_TX_DESC_CMD_IDE);
1268
1269                 if(++i == adapter->tx_ring.count) i = 0;
1270                 adapter->tx_ring.next_to_use = i;
1271
1272                 return true;
1273         }
1274
1275         return false;
1276 }
1277
1278 #define IXGB_MAX_TXD_PWR        14
1279 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1280
1281 static int
1282 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1283             unsigned int first)
1284 {
1285         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1286         struct ixgb_buffer *buffer_info;
1287         int len = skb->len;
1288         unsigned int offset = 0, size, count = 0, i;
1289         unsigned int mss = skb_shinfo(skb)->gso_size;
1290
1291         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1292         unsigned int f;
1293
1294         len -= skb->data_len;
1295
1296         i = tx_ring->next_to_use;
1297
1298         while(len) {
1299                 buffer_info = &tx_ring->buffer_info[i];
1300                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1301                 /* Workaround for premature desc write-backs
1302                  * in TSO mode.  Append 4-byte sentinel desc */
1303                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1304                         size -= 4;
1305
1306                 buffer_info->length = size;
1307                 WARN_ON(buffer_info->dma != 0);
1308                 buffer_info->dma =
1309                         pci_map_single(adapter->pdev,
1310                                 skb->data + offset,
1311                                 size,
1312                                 PCI_DMA_TODEVICE);
1313                 buffer_info->time_stamp = jiffies;
1314                 buffer_info->next_to_watch = 0;
1315
1316                 len -= size;
1317                 offset += size;
1318                 count++;
1319                 if(++i == tx_ring->count) i = 0;
1320         }
1321
1322         for(f = 0; f < nr_frags; f++) {
1323                 struct skb_frag_struct *frag;
1324
1325                 frag = &skb_shinfo(skb)->frags[f];
1326                 len = frag->size;
1327                 offset = 0;
1328
1329                 while(len) {
1330                         buffer_info = &tx_ring->buffer_info[i];
1331                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1332
1333                         /* Workaround for premature desc write-backs
1334                          * in TSO mode.  Append 4-byte sentinel desc */
1335                         if (unlikely(mss && (f == (nr_frags - 1))
1336                                      && size == len && size > 8))
1337                                 size -= 4;
1338
1339                         buffer_info->length = size;
1340                         buffer_info->dma =
1341                                 pci_map_page(adapter->pdev,
1342                                         frag->page,
1343                                         frag->page_offset + offset,
1344                                         size,
1345                                         PCI_DMA_TODEVICE);
1346                         buffer_info->time_stamp = jiffies;
1347                         buffer_info->next_to_watch = 0;
1348
1349                         len -= size;
1350                         offset += size;
1351                         count++;
1352                         if(++i == tx_ring->count) i = 0;
1353                 }
1354         }
1355         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1356         tx_ring->buffer_info[i].skb = skb;
1357         tx_ring->buffer_info[first].next_to_watch = i;
1358
1359         return count;
1360 }
1361
1362 static void
1363 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1364 {
1365         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1366         struct ixgb_tx_desc *tx_desc = NULL;
1367         struct ixgb_buffer *buffer_info;
1368         u32 cmd_type_len = adapter->tx_cmd_type;
1369         u8 status = 0;
1370         u8 popts = 0;
1371         unsigned int i;
1372
1373         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1374                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1375                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1376         }
1377
1378         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1379                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1380
1381         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1382                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1383         }
1384
1385         i = tx_ring->next_to_use;
1386
1387         while(count--) {
1388                 buffer_info = &tx_ring->buffer_info[i];
1389                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1390                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1391                 tx_desc->cmd_type_len =
1392                         cpu_to_le32(cmd_type_len | buffer_info->length);
1393                 tx_desc->status = status;
1394                 tx_desc->popts = popts;
1395                 tx_desc->vlan = cpu_to_le16(vlan_id);
1396
1397                 if(++i == tx_ring->count) i = 0;
1398         }
1399
1400         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1401                                 | IXGB_TX_DESC_CMD_RS );
1402
1403         /* Force memory writes to complete before letting h/w
1404          * know there are new descriptors to fetch.  (Only
1405          * applicable for weak-ordered memory model archs,
1406          * such as IA-64). */
1407         wmb();
1408
1409         tx_ring->next_to_use = i;
1410         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1411 }
1412
1413 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1414 {
1415         struct ixgb_adapter *adapter = netdev_priv(netdev);
1416         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1417
1418         netif_stop_queue(netdev);
1419         /* Herbert's original patch had:
1420          *  smp_mb__after_netif_stop_queue();
1421          * but since that doesn't exist yet, just open code it. */
1422         smp_mb();
1423
1424         /* We need to check again in a case another CPU has just
1425          * made room available. */
1426         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1427                 return -EBUSY;
1428
1429         /* A reprieve! */
1430         netif_start_queue(netdev);
1431         ++adapter->restart_queue;
1432         return 0;
1433 }
1434
1435 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1436                               struct ixgb_desc_ring *tx_ring, int size)
1437 {
1438         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1439                 return 0;
1440         return __ixgb_maybe_stop_tx(netdev, size);
1441 }
1442
1443
1444 /* Tx Descriptors needed, worst case */
1445 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1446                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1447 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1448         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1449         + 1 /* one more needed for sentinel TSO workaround */
1450
1451 static int
1452 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1453 {
1454         struct ixgb_adapter *adapter = netdev_priv(netdev);
1455         unsigned int first;
1456         unsigned int tx_flags = 0;
1457         unsigned long flags;
1458         int vlan_id = 0;
1459         int tso;
1460
1461         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1462                 dev_kfree_skb(skb);
1463                 return NETDEV_TX_OK;
1464         }
1465
1466         if(skb->len <= 0) {
1467                 dev_kfree_skb_any(skb);
1468                 return 0;
1469         }
1470
1471 #ifdef NETIF_F_LLTX
1472         if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
1473                 /* Collision - tell upper layer to requeue */
1474                 local_irq_restore(flags);
1475                 return NETDEV_TX_LOCKED;
1476         }
1477 #else
1478         spin_lock_irqsave(&adapter->tx_lock, flags);
1479 #endif
1480
1481         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1482                      DESC_NEEDED))) {
1483                 netif_stop_queue(netdev);
1484                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1485                 return NETDEV_TX_BUSY;
1486         }
1487
1488 #ifndef NETIF_F_LLTX
1489         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1490 #endif
1491
1492         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1493                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1494                 vlan_id = vlan_tx_tag_get(skb);
1495         }
1496
1497         first = adapter->tx_ring.next_to_use;
1498         
1499         tso = ixgb_tso(adapter, skb);
1500         if (tso < 0) {
1501                 dev_kfree_skb_any(skb);
1502 #ifdef NETIF_F_LLTX
1503                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1504 #endif
1505                 return NETDEV_TX_OK;
1506         }
1507
1508         if (likely(tso))
1509                 tx_flags |= IXGB_TX_FLAGS_TSO;
1510         else if(ixgb_tx_csum(adapter, skb))
1511                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1512
1513         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1514                         tx_flags);
1515
1516         netdev->trans_start = jiffies;
1517
1518 #ifdef NETIF_F_LLTX
1519         /* Make sure there is space in the ring for the next send. */
1520         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1521
1522         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1523
1524 #endif
1525         return NETDEV_TX_OK;
1526 }
1527
1528 /**
1529  * ixgb_tx_timeout - Respond to a Tx Hang
1530  * @netdev: network interface device structure
1531  **/
1532
1533 static void
1534 ixgb_tx_timeout(struct net_device *netdev)
1535 {
1536         struct ixgb_adapter *adapter = netdev_priv(netdev);
1537
1538         /* Do the reset outside of interrupt context */
1539         schedule_work(&adapter->tx_timeout_task);
1540 }
1541
1542 static void
1543 ixgb_tx_timeout_task(struct work_struct *work)
1544 {
1545         struct ixgb_adapter *adapter =
1546                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1547
1548         adapter->tx_timeout_count++;
1549         ixgb_down(adapter, true);
1550         ixgb_up(adapter);
1551 }
1552
1553 /**
1554  * ixgb_get_stats - Get System Network Statistics
1555  * @netdev: network interface device structure
1556  *
1557  * Returns the address of the device statistics structure.
1558  * The statistics are actually updated from the timer callback.
1559  **/
1560
1561 static struct net_device_stats *
1562 ixgb_get_stats(struct net_device *netdev)
1563 {
1564         struct ixgb_adapter *adapter = netdev_priv(netdev);
1565
1566         return &adapter->net_stats;
1567 }
1568
1569 /**
1570  * ixgb_change_mtu - Change the Maximum Transfer Unit
1571  * @netdev: network interface device structure
1572  * @new_mtu: new value for maximum frame size
1573  *
1574  * Returns 0 on success, negative on failure
1575  **/
1576
1577 static int
1578 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1579 {
1580         struct ixgb_adapter *adapter = netdev_priv(netdev);
1581         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1582         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1583
1584
1585         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1586            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1587                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1588                 return -EINVAL;
1589         }
1590
1591         adapter->rx_buffer_len = max_frame;
1592
1593         netdev->mtu = new_mtu;
1594
1595         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1596                 ixgb_down(adapter, true);
1597                 ixgb_up(adapter);
1598         }
1599
1600         return 0;
1601 }
1602
1603 /**
1604  * ixgb_update_stats - Update the board statistics counters.
1605  * @adapter: board private structure
1606  **/
1607
1608 void
1609 ixgb_update_stats(struct ixgb_adapter *adapter)
1610 {
1611         struct net_device *netdev = adapter->netdev;
1612         struct pci_dev *pdev = adapter->pdev;
1613
1614         /* Prevent stats update while adapter is being reset */
1615         if (pci_channel_offline(pdev))
1616                 return;
1617
1618         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1619            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1620                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1621                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1622                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1623                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1624
1625                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1626                 /* fix up multicast stats by removing broadcasts */
1627                 if(multi >= bcast)
1628                         multi -= bcast;
1629                 
1630                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1631                 adapter->stats.mprch += (multi >> 32);
1632                 adapter->stats.bprcl += bcast_l; 
1633                 adapter->stats.bprch += bcast_h;
1634         } else {
1635                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1636                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1637                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1638                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1639         }
1640         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1641         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1642         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1643         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1644         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1645         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1646         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1647         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1648         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1649         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1650         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1651         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1652         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1653         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1654         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1655         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1656         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1657         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1658         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1659         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1660         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1661         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1662         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1663         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1664         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1665         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1666         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1667         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1668         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1669         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1670         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1671         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1672         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1673         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1674         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1675         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1676         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1677         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1678         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1679         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1680         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1681         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1682         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1683         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1684         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1685         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1686         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1687         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1688         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1689         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1690         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1691         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1692         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1693         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1694         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1695         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1696
1697         /* Fill out the OS statistics structure */
1698
1699         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1700         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1701         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1702         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1703         adapter->net_stats.multicast = adapter->stats.mprcl;
1704         adapter->net_stats.collisions = 0;
1705
1706         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1707          * with a length in the type/len field */
1708         adapter->net_stats.rx_errors =
1709             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1710             adapter->stats.ruc +
1711             adapter->stats.roc /*+ adapter->stats.rlec */  +
1712             adapter->stats.icbc +
1713             adapter->stats.ecbc + adapter->stats.mpc;
1714
1715         /* see above
1716          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1717          */
1718
1719         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1720         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1721         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1722         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1723
1724         adapter->net_stats.tx_errors = 0;
1725         adapter->net_stats.rx_frame_errors = 0;
1726         adapter->net_stats.tx_aborted_errors = 0;
1727         adapter->net_stats.tx_carrier_errors = 0;
1728         adapter->net_stats.tx_fifo_errors = 0;
1729         adapter->net_stats.tx_heartbeat_errors = 0;
1730         adapter->net_stats.tx_window_errors = 0;
1731 }
1732
1733 #define IXGB_MAX_INTR 10
1734 /**
1735  * ixgb_intr - Interrupt Handler
1736  * @irq: interrupt number
1737  * @data: pointer to a network interface device structure
1738  **/
1739
1740 static irqreturn_t
1741 ixgb_intr(int irq, void *data)
1742 {
1743         struct net_device *netdev = data;
1744         struct ixgb_adapter *adapter = netdev_priv(netdev);
1745         struct ixgb_hw *hw = &adapter->hw;
1746         u32 icr = IXGB_READ_REG(hw, ICR);
1747 #ifndef CONFIG_IXGB_NAPI
1748         unsigned int i;
1749 #endif
1750
1751         if(unlikely(!icr))
1752                 return IRQ_NONE;  /* Not our interrupt */
1753
1754         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1755                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1756                         mod_timer(&adapter->watchdog_timer, jiffies);
1757
1758 #ifdef CONFIG_IXGB_NAPI
1759         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1760
1761                 /* Disable interrupts and register for poll. The flush 
1762                   of the posted write is intentionally left out.
1763                 */
1764
1765                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1766                 __netif_rx_schedule(netdev, &adapter->napi);
1767         }
1768 #else
1769         /* yes, that is actually a & and it is meant to make sure that
1770          * every pass through this for loop checks both receive and
1771          * transmit queues for completed descriptors, intended to
1772          * avoid starvation issues and assist tx/rx fairness. */
1773         for(i = 0; i < IXGB_MAX_INTR; i++)
1774                 if(!ixgb_clean_rx_irq(adapter) &
1775                    !ixgb_clean_tx_irq(adapter))
1776                         break;
1777 #endif 
1778         return IRQ_HANDLED;
1779 }
1780
1781 #ifdef CONFIG_IXGB_NAPI
1782 /**
1783  * ixgb_clean - NAPI Rx polling callback
1784  * @adapter: board private structure
1785  **/
1786
1787 static int
1788 ixgb_clean(struct napi_struct *napi, int budget)
1789 {
1790         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1791         struct net_device *netdev = adapter->netdev;
1792         int work_done = 0;
1793
1794         ixgb_clean_tx_irq(adapter);
1795         ixgb_clean_rx_irq(adapter, &work_done, budget);
1796
1797         /* If budget not fully consumed, exit the polling mode */
1798         if (work_done < budget) {
1799                 netif_rx_complete(netdev, napi);
1800                 ixgb_irq_enable(adapter);
1801         }
1802
1803         return work_done;
1804 }
1805 #endif
1806
1807 /**
1808  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1809  * @adapter: board private structure
1810  **/
1811
1812 static bool
1813 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1814 {
1815         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1816         struct net_device *netdev = adapter->netdev;
1817         struct ixgb_tx_desc *tx_desc, *eop_desc;
1818         struct ixgb_buffer *buffer_info;
1819         unsigned int i, eop;
1820         bool cleaned = false;
1821
1822         i = tx_ring->next_to_clean;
1823         eop = tx_ring->buffer_info[i].next_to_watch;
1824         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1825
1826         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1827
1828                 for (cleaned = false; !cleaned; ) {
1829                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1830                         buffer_info = &tx_ring->buffer_info[i];
1831
1832                         if (tx_desc->popts
1833                             & (IXGB_TX_DESC_POPTS_TXSM |
1834                                IXGB_TX_DESC_POPTS_IXSM))
1835                                 adapter->hw_csum_tx_good++;
1836
1837                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1838
1839                         *(u32 *)&(tx_desc->status) = 0;
1840
1841                         cleaned = (i == eop);
1842                         if(++i == tx_ring->count) i = 0;
1843                 }
1844
1845                 eop = tx_ring->buffer_info[i].next_to_watch;
1846                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1847         }
1848
1849         tx_ring->next_to_clean = i;
1850
1851         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1852                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1853                 /* Make sure that anybody stopping the queue after this
1854                  * sees the new next_to_clean. */
1855                 smp_mb();
1856
1857                 if (netif_queue_stopped(netdev) &&
1858                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1859                         netif_wake_queue(netdev);
1860                         ++adapter->restart_queue;
1861                 }
1862         }
1863
1864         if(adapter->detect_tx_hung) {
1865                 /* detect a transmit hang in hardware, this serializes the
1866                  * check with the clearing of time_stamp and movement of i */
1867                 adapter->detect_tx_hung = false;
1868                 if (tx_ring->buffer_info[eop].dma &&
1869                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1870                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1871                         IXGB_STATUS_TXOFF)) {
1872                         /* detected Tx unit hang */
1873                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1874                                         "  TDH                  <%x>\n"
1875                                         "  TDT                  <%x>\n"
1876                                         "  next_to_use          <%x>\n"
1877                                         "  next_to_clean        <%x>\n"
1878                                         "buffer_info[next_to_clean]\n"
1879                                         "  time_stamp           <%lx>\n"
1880                                         "  next_to_watch        <%x>\n"
1881                                         "  jiffies              <%lx>\n"
1882                                         "  next_to_watch.status <%x>\n",
1883                                 IXGB_READ_REG(&adapter->hw, TDH),
1884                                 IXGB_READ_REG(&adapter->hw, TDT),
1885                                 tx_ring->next_to_use,
1886                                 tx_ring->next_to_clean,
1887                                 tx_ring->buffer_info[eop].time_stamp,
1888                                 eop,
1889                                 jiffies,
1890                                 eop_desc->status);
1891                         netif_stop_queue(netdev);
1892                 }
1893         }
1894
1895         return cleaned;
1896 }
1897
1898 /**
1899  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1900  * @adapter: board private structure
1901  * @rx_desc: receive descriptor
1902  * @sk_buff: socket buffer with received data
1903  **/
1904
1905 static void
1906 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1907                  struct ixgb_rx_desc *rx_desc,
1908                  struct sk_buff *skb)
1909 {
1910         /* Ignore Checksum bit is set OR
1911          * TCP Checksum has not been calculated
1912          */
1913         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1914            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1915                 skb->ip_summed = CHECKSUM_NONE;
1916                 return;
1917         }
1918
1919         /* At this point we know the hardware did the TCP checksum */
1920         /* now look at the TCP checksum error bit */
1921         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1922                 /* let the stack verify checksum errors */
1923                 skb->ip_summed = CHECKSUM_NONE;
1924                 adapter->hw_csum_rx_error++;
1925         } else {
1926                 /* TCP checksum is good */
1927                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1928                 adapter->hw_csum_rx_good++;
1929         }
1930 }
1931
1932 /**
1933  * ixgb_clean_rx_irq - Send received data up the network stack,
1934  * @adapter: board private structure
1935  **/
1936
1937 static bool
1938 #ifdef CONFIG_IXGB_NAPI
1939 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1940 #else
1941 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1942 #endif
1943 {
1944         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1945         struct net_device *netdev = adapter->netdev;
1946         struct pci_dev *pdev = adapter->pdev;
1947         struct ixgb_rx_desc *rx_desc, *next_rxd;
1948         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1949         u32 length;
1950         unsigned int i, j;
1951         bool cleaned = false;
1952
1953         i = rx_ring->next_to_clean;
1954         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1955         buffer_info = &rx_ring->buffer_info[i];
1956
1957         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1958                 struct sk_buff *skb, *next_skb;
1959                 u8 status;
1960
1961 #ifdef CONFIG_IXGB_NAPI
1962                 if(*work_done >= work_to_do)
1963                         break;
1964
1965                 (*work_done)++;
1966 #endif
1967                 status = rx_desc->status;
1968                 skb = buffer_info->skb;
1969                 buffer_info->skb = NULL;
1970
1971                 prefetch(skb->data);
1972
1973                 if(++i == rx_ring->count) i = 0;
1974                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1975                 prefetch(next_rxd);
1976
1977                 if((j = i + 1) == rx_ring->count) j = 0;
1978                 next2_buffer = &rx_ring->buffer_info[j];
1979                 prefetch(next2_buffer);
1980
1981                 next_buffer = &rx_ring->buffer_info[i];
1982                 next_skb = next_buffer->skb;
1983                 prefetch(next_skb);
1984
1985                 cleaned = true;
1986
1987                 pci_unmap_single(pdev,
1988                                  buffer_info->dma,
1989                                  buffer_info->length,
1990                                  PCI_DMA_FROMDEVICE);
1991
1992                 length = le16_to_cpu(rx_desc->length);
1993
1994                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1995
1996                         /* All receives must fit into a single buffer */
1997
1998                         IXGB_DBG("Receive packet consumed multiple buffers "
1999                                          "length<%x>\n", length);
2000
2001                         dev_kfree_skb_irq(skb);
2002                         goto rxdesc_done;
2003                 }
2004
2005                 if (unlikely(rx_desc->errors
2006                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
2007                                 | IXGB_RX_DESC_ERRORS_P |
2008                                 IXGB_RX_DESC_ERRORS_RXE))) {
2009
2010                         dev_kfree_skb_irq(skb);
2011                         goto rxdesc_done;
2012                 }
2013
2014                 /* code added for copybreak, this should improve
2015                  * performance for small packets with large amounts
2016                  * of reassembly being done in the stack */
2017 #define IXGB_CB_LENGTH 256
2018                 if (length < IXGB_CB_LENGTH) {
2019                         struct sk_buff *new_skb =
2020                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2021                         if (new_skb) {
2022                                 skb_reserve(new_skb, NET_IP_ALIGN);
2023                                 skb_copy_to_linear_data_offset(new_skb,
2024                                                                -NET_IP_ALIGN,
2025                                                                (skb->data -
2026                                                                 NET_IP_ALIGN),
2027                                                                (length +
2028                                                                 NET_IP_ALIGN));
2029                                 /* save the skb in buffer_info as good */
2030                                 buffer_info->skb = skb;
2031                                 skb = new_skb;
2032                         }
2033                 }
2034                 /* end copybreak code */
2035
2036                 /* Good Receive */
2037                 skb_put(skb, length);
2038
2039                 /* Receive Checksum Offload */
2040                 ixgb_rx_checksum(adapter, rx_desc, skb);
2041
2042                 skb->protocol = eth_type_trans(skb, netdev);
2043 #ifdef CONFIG_IXGB_NAPI
2044                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2045                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2046                                 le16_to_cpu(rx_desc->special));
2047                 } else {
2048                         netif_receive_skb(skb);
2049                 }
2050 #else /* CONFIG_IXGB_NAPI */
2051                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2052                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2053                                 le16_to_cpu(rx_desc->special));
2054                 } else {
2055                         netif_rx(skb);
2056                 }
2057 #endif /* CONFIG_IXGB_NAPI */
2058                 netdev->last_rx = jiffies;
2059
2060 rxdesc_done:
2061                 /* clean up descriptor, might be written over by hw */
2062                 rx_desc->status = 0;
2063
2064                 /* use prefetched values */
2065                 rx_desc = next_rxd;
2066                 buffer_info = next_buffer;
2067         }
2068
2069         rx_ring->next_to_clean = i;
2070
2071         ixgb_alloc_rx_buffers(adapter);
2072
2073         return cleaned;
2074 }
2075
2076 /**
2077  * ixgb_alloc_rx_buffers - Replace used receive buffers
2078  * @adapter: address of board private structure
2079  **/
2080
2081 static void
2082 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2083 {
2084         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2085         struct net_device *netdev = adapter->netdev;
2086         struct pci_dev *pdev = adapter->pdev;
2087         struct ixgb_rx_desc *rx_desc;
2088         struct ixgb_buffer *buffer_info;
2089         struct sk_buff *skb;
2090         unsigned int i;
2091         long cleancount;
2092
2093         i = rx_ring->next_to_use;
2094         buffer_info = &rx_ring->buffer_info[i];
2095         cleancount = IXGB_DESC_UNUSED(rx_ring);
2096
2097
2098         /* leave three descriptors unused */
2099         while(--cleancount > 2) {
2100                 /* recycle! its good for you */
2101                 skb = buffer_info->skb;
2102                 if (skb) {
2103                         skb_trim(skb, 0);
2104                         goto map_skb;
2105                 }
2106
2107                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2108                                        + NET_IP_ALIGN);
2109                 if (unlikely(!skb)) {
2110                         /* Better luck next round */
2111                         adapter->alloc_rx_buff_failed++;
2112                         break;
2113                 }
2114
2115                 /* Make buffer alignment 2 beyond a 16 byte boundary
2116                  * this will result in a 16 byte aligned IP header after
2117                  * the 14 byte MAC header is removed
2118                  */
2119                 skb_reserve(skb, NET_IP_ALIGN);
2120
2121                 buffer_info->skb = skb;
2122                 buffer_info->length = adapter->rx_buffer_len;
2123 map_skb:
2124                 buffer_info->dma = pci_map_single(pdev,
2125                                                   skb->data,
2126                                                   adapter->rx_buffer_len,
2127                                                   PCI_DMA_FROMDEVICE);
2128
2129                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2130                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2131                 /* guarantee DD bit not set now before h/w gets descriptor
2132                  * this is the rest of the workaround for h/w double 
2133                  * writeback. */
2134                 rx_desc->status = 0;
2135
2136
2137                 if(++i == rx_ring->count) i = 0;
2138                 buffer_info = &rx_ring->buffer_info[i];
2139         }
2140
2141         if (likely(rx_ring->next_to_use != i)) {
2142                 rx_ring->next_to_use = i;
2143                 if (unlikely(i-- == 0))
2144                         i = (rx_ring->count - 1);
2145
2146                 /* Force memory writes to complete before letting h/w
2147                  * know there are new descriptors to fetch.  (Only
2148                  * applicable for weak-ordered memory model archs, such
2149                  * as IA-64). */
2150                 wmb();
2151                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2152         }
2153 }
2154
2155 /**
2156  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2157  * 
2158  * @param netdev network interface device structure
2159  * @param grp indicates to enable or disable tagging/stripping
2160  **/
2161 static void
2162 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2163 {
2164         struct ixgb_adapter *adapter = netdev_priv(netdev);
2165         u32 ctrl, rctl;
2166
2167         ixgb_irq_disable(adapter);
2168         adapter->vlgrp = grp;
2169
2170         if(grp) {
2171                 /* enable VLAN tag insert/strip */
2172                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2173                 ctrl |= IXGB_CTRL0_VME;
2174                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2175
2176                 /* enable VLAN receive filtering */
2177
2178                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2179                 rctl |= IXGB_RCTL_VFE;
2180                 rctl &= ~IXGB_RCTL_CFIEN;
2181                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2182         } else {
2183                 /* disable VLAN tag insert/strip */
2184
2185                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2186                 ctrl &= ~IXGB_CTRL0_VME;
2187                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2188
2189                 /* disable VLAN filtering */
2190
2191                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2192                 rctl &= ~IXGB_RCTL_VFE;
2193                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2194         }
2195
2196         /* don't enable interrupts unless we are UP */
2197         if (adapter->netdev->flags & IFF_UP)
2198                 ixgb_irq_enable(adapter);
2199 }
2200
2201 static void
2202 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2203 {
2204         struct ixgb_adapter *adapter = netdev_priv(netdev);
2205         u32 vfta, index;
2206
2207         /* add VID to filter table */
2208
2209         index = (vid >> 5) & 0x7F;
2210         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2211         vfta |= (1 << (vid & 0x1F));
2212         ixgb_write_vfta(&adapter->hw, index, vfta);
2213 }
2214
2215 static void
2216 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2217 {
2218         struct ixgb_adapter *adapter = netdev_priv(netdev);
2219         u32 vfta, index;
2220
2221         ixgb_irq_disable(adapter);
2222
2223         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2224
2225         /* don't enable interrupts unless we are UP */
2226         if (adapter->netdev->flags & IFF_UP)
2227                 ixgb_irq_enable(adapter);
2228
2229         /* remove VID from filter table */
2230
2231         index = (vid >> 5) & 0x7F;
2232         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2233         vfta &= ~(1 << (vid & 0x1F));
2234         ixgb_write_vfta(&adapter->hw, index, vfta);
2235 }
2236
2237 static void
2238 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2239 {
2240         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2241
2242         if(adapter->vlgrp) {
2243                 u16 vid;
2244                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2245                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2246                                 continue;
2247                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2248                 }
2249         }
2250 }
2251
2252 #ifdef CONFIG_NET_POLL_CONTROLLER
2253 /*
2254  * Polling 'interrupt' - used by things like netconsole to send skbs
2255  * without having to re-enable interrupts. It's not called while
2256  * the interrupt routine is executing.
2257  */
2258
2259 static void ixgb_netpoll(struct net_device *dev)
2260 {
2261         struct ixgb_adapter *adapter = netdev_priv(dev);
2262
2263         disable_irq(adapter->pdev->irq);
2264         ixgb_intr(adapter->pdev->irq, dev);
2265         enable_irq(adapter->pdev->irq);
2266 }
2267 #endif
2268
2269 /**
2270  * ixgb_io_error_detected() - called when PCI error is detected
2271  * @pdev    pointer to pci device with error
2272  * @state   pci channel state after error
2273  *
2274  * This callback is called by the PCI subsystem whenever
2275  * a PCI bus error is detected.
2276  */
2277 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2278                                      enum pci_channel_state state)
2279 {
2280         struct net_device *netdev = pci_get_drvdata(pdev);
2281         struct ixgb_adapter *adapter = netdev_priv(netdev);
2282
2283         if(netif_running(netdev))
2284                 ixgb_down(adapter, true);
2285
2286         pci_disable_device(pdev);
2287
2288         /* Request a slot reset. */
2289         return PCI_ERS_RESULT_NEED_RESET;
2290 }
2291
2292 /**
2293  * ixgb_io_slot_reset - called after the pci bus has been reset.
2294  * @pdev    pointer to pci device with error
2295  *
2296  * This callback is called after the PCI buss has been reset.
2297  * Basically, this tries to restart the card from scratch.
2298  * This is a shortened version of the device probe/discovery code,
2299  * it resembles the first-half of the ixgb_probe() routine.
2300  */
2301 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2302 {
2303         struct net_device *netdev = pci_get_drvdata(pdev);
2304         struct ixgb_adapter *adapter = netdev_priv(netdev);
2305
2306         if(pci_enable_device(pdev)) {
2307                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2308                 return PCI_ERS_RESULT_DISCONNECT;
2309         }
2310
2311         /* Perform card reset only on one instance of the card */
2312         if (0 != PCI_FUNC (pdev->devfn))
2313                 return PCI_ERS_RESULT_RECOVERED;
2314
2315         pci_set_master(pdev);
2316
2317         netif_carrier_off(netdev);
2318         netif_stop_queue(netdev);
2319         ixgb_reset(adapter);
2320
2321         /* Make sure the EEPROM is good */
2322         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2323                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2324                 return PCI_ERS_RESULT_DISCONNECT;
2325         }
2326         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2327         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2328
2329         if(!is_valid_ether_addr(netdev->perm_addr)) {
2330                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2331                 return PCI_ERS_RESULT_DISCONNECT;
2332         }
2333
2334         return PCI_ERS_RESULT_RECOVERED;
2335 }
2336
2337 /**
2338  * ixgb_io_resume - called when its OK to resume normal operations
2339  * @pdev    pointer to pci device with error
2340  *
2341  * The error recovery driver tells us that its OK to resume
2342  * normal operation. Implementation resembles the second-half
2343  * of the ixgb_probe() routine.
2344  */
2345 static void ixgb_io_resume (struct pci_dev *pdev)
2346 {
2347         struct net_device *netdev = pci_get_drvdata(pdev);
2348         struct ixgb_adapter *adapter = netdev_priv(netdev);
2349
2350         pci_set_master(pdev);
2351
2352         if(netif_running(netdev)) {
2353                 if(ixgb_up(adapter)) {
2354                         printk ("ixgb: can't bring device back up after reset\n");
2355                         return;
2356                 }
2357         }
2358
2359         netif_device_attach(netdev);
2360         mod_timer(&adapter->watchdog_timer, jiffies);
2361 }
2362
2363 /* ixgb_main.c */