ixgb: add copybreak parameter
[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 #define IXGB_CB_LENGTH 256
44 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
45 module_param(copybreak, uint, 0644);
46 MODULE_PARM_DESC(copybreak,
47         "Maximum size of packet that is copied to a new buffer on receive");
48
49 /* ixgb_pci_tbl - PCI Device ID Table
50  *
51  * Wildcard entries (PCI_ANY_ID) should come last
52  * Last entry must be all 0s
53  *
54  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
55  *   Class, Class Mask, private data (not used) }
56  */
57 static struct pci_device_id ixgb_pci_tbl[] = {
58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,  
65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
66
67         /* required last entry */
68         {0,}
69 };
70
71 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
72
73 /* Local Function Prototypes */
74
75 int ixgb_up(struct ixgb_adapter *adapter);
76 void ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog);
77 void ixgb_reset(struct ixgb_adapter *adapter);
78 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
79 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
80 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
81 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
82 void ixgb_update_stats(struct ixgb_adapter *adapter);
83
84 static int ixgb_init_module(void);
85 static void ixgb_exit_module(void);
86 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
87 static void __devexit ixgb_remove(struct pci_dev *pdev);
88 static int ixgb_sw_init(struct ixgb_adapter *adapter);
89 static int ixgb_open(struct net_device *netdev);
90 static int ixgb_close(struct net_device *netdev);
91 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
92 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
93 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
94 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
95 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
96 static void ixgb_set_multi(struct net_device *netdev);
97 static void ixgb_watchdog(unsigned long data);
98 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
99 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
100 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
101 static int ixgb_set_mac(struct net_device *netdev, void *p);
102 static irqreturn_t ixgb_intr(int irq, void *data);
103 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
104
105 #ifdef CONFIG_IXGB_NAPI
106 static int ixgb_clean(struct napi_struct *napi, int budget);
107 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
108                               int *work_done, int work_to_do);
109 #else
110 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
111 #endif
112 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
113 static void ixgb_tx_timeout(struct net_device *dev);
114 static void ixgb_tx_timeout_task(struct work_struct *work);
115 static void ixgb_vlan_rx_register(struct net_device *netdev,
116                                   struct vlan_group *grp);
117 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
118 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
119 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
120
121 #ifdef CONFIG_NET_POLL_CONTROLLER
122 /* for netdump / net console */
123 static void ixgb_netpoll(struct net_device *dev);
124 #endif
125
126 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
127                              enum pci_channel_state state);
128 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
129 static void ixgb_io_resume (struct pci_dev *pdev);
130
131 static struct pci_error_handlers ixgb_err_handler = {
132         .error_detected = ixgb_io_error_detected,
133         .slot_reset = ixgb_io_slot_reset,
134         .resume = ixgb_io_resume,
135 };
136
137 static struct pci_driver ixgb_driver = {
138         .name     = ixgb_driver_name,
139         .id_table = ixgb_pci_tbl,
140         .probe    = ixgb_probe,
141         .remove   = __devexit_p(ixgb_remove),
142         .err_handler = &ixgb_err_handler
143 };
144
145 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
146 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
147 MODULE_LICENSE("GPL");
148 MODULE_VERSION(DRV_VERSION);
149
150 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
151 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
152 module_param(debug, int, 0);
153 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
154
155 /**
156  * ixgb_init_module - Driver Registration Routine
157  *
158  * ixgb_init_module is the first routine called when the driver is
159  * loaded. All it does is register with the PCI subsystem.
160  **/
161
162 static int __init
163 ixgb_init_module(void)
164 {
165         printk(KERN_INFO "%s - version %s\n",
166                ixgb_driver_string, ixgb_driver_version);
167
168         printk(KERN_INFO "%s\n", ixgb_copyright);
169
170         return pci_register_driver(&ixgb_driver);
171 }
172
173 module_init(ixgb_init_module);
174
175 /**
176  * ixgb_exit_module - Driver Exit Cleanup Routine
177  *
178  * ixgb_exit_module is called just before the driver is removed
179  * from memory.
180  **/
181
182 static void __exit
183 ixgb_exit_module(void)
184 {
185         pci_unregister_driver(&ixgb_driver);
186 }
187
188 module_exit(ixgb_exit_module);
189
190 /**
191  * ixgb_irq_disable - Mask off interrupt generation on the NIC
192  * @adapter: board private structure
193  **/
194
195 static void
196 ixgb_irq_disable(struct ixgb_adapter *adapter)
197 {
198         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
199         IXGB_WRITE_FLUSH(&adapter->hw);
200         synchronize_irq(adapter->pdev->irq);
201 }
202
203 /**
204  * ixgb_irq_enable - Enable default interrupt generation settings
205  * @adapter: board private structure
206  **/
207
208 static void
209 ixgb_irq_enable(struct ixgb_adapter *adapter)
210 {
211         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
212                   IXGB_INT_TXDW | IXGB_INT_LSC;
213         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
214                 val |= IXGB_INT_GPI0;
215         IXGB_WRITE_REG(&adapter->hw, IMS, val);
216         IXGB_WRITE_FLUSH(&adapter->hw);
217 }
218
219 int
220 ixgb_up(struct ixgb_adapter *adapter)
221 {
222         struct net_device *netdev = adapter->netdev;
223         int err, irq_flags = IRQF_SHARED;
224         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
225         struct ixgb_hw *hw = &adapter->hw;
226
227         /* hardware has been reset, we need to reload some things */
228
229         ixgb_rar_set(hw, netdev->dev_addr, 0);
230         ixgb_set_multi(netdev);
231
232         ixgb_restore_vlan(adapter);
233
234         ixgb_configure_tx(adapter);
235         ixgb_setup_rctl(adapter);
236         ixgb_configure_rx(adapter);
237         ixgb_alloc_rx_buffers(adapter);
238
239         /* disable interrupts and get the hardware into a known state */
240         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
241
242         /* only enable MSI if bus is in PCI-X mode */
243         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
244                 err = pci_enable_msi(adapter->pdev);
245                 if (!err) {
246                         adapter->have_msi = 1;
247                         irq_flags = 0;
248                 }
249                 /* proceed to try to request regular interrupt */
250         }
251
252         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
253                           netdev->name, netdev);
254         if (err) {
255                 if (adapter->have_msi)
256                         pci_disable_msi(adapter->pdev);
257                 DPRINTK(PROBE, ERR,
258                  "Unable to allocate interrupt Error: %d\n", err);
259                 return err;
260         }
261
262         if((hw->max_frame_size != max_frame) ||
263                 (hw->max_frame_size !=
264                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
265
266                 hw->max_frame_size = max_frame;
267
268                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
269
270                 if(hw->max_frame_size >
271                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
272                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
273
274                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
275                                 ctrl0 |= IXGB_CTRL0_JFE;
276                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
277                         }
278                 }
279         }
280
281         clear_bit(__IXGB_DOWN, &adapter->flags);
282
283 #ifdef CONFIG_IXGB_NAPI
284         napi_enable(&adapter->napi);
285 #endif
286         ixgb_irq_enable(adapter);
287
288         mod_timer(&adapter->watchdog_timer, jiffies);
289
290         return 0;
291 }
292
293 void
294 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
295 {
296         struct net_device *netdev = adapter->netdev;
297
298         /* prevent the interrupt handler from restarting watchdog */
299         set_bit(__IXGB_DOWN, &adapter->flags);
300
301 #ifdef CONFIG_IXGB_NAPI
302         napi_disable(&adapter->napi);
303 #endif
304         /* waiting for NAPI to complete can re-enable interrupts */
305         ixgb_irq_disable(adapter);
306         free_irq(adapter->pdev->irq, netdev);
307
308         if (adapter->have_msi)
309                 pci_disable_msi(adapter->pdev);
310
311         if(kill_watchdog)
312                 del_timer_sync(&adapter->watchdog_timer);
313
314         adapter->link_speed = 0;
315         adapter->link_duplex = 0;
316         netif_carrier_off(netdev);
317         netif_stop_queue(netdev);
318
319         ixgb_reset(adapter);
320         ixgb_clean_tx_ring(adapter);
321         ixgb_clean_rx_ring(adapter);
322 }
323
324 void
325 ixgb_reset(struct ixgb_adapter *adapter)
326 {
327         struct ixgb_hw *hw = &adapter->hw;
328
329         ixgb_adapter_stop(hw);
330         if (!ixgb_init_hw(hw))
331                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
332
333         /* restore frame size information */
334         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
335         if (hw->max_frame_size >
336             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
337                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
338                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
339                         ctrl0 |= IXGB_CTRL0_JFE;
340                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
341                 }
342         }
343 }
344
345 /**
346  * ixgb_probe - Device Initialization Routine
347  * @pdev: PCI device information struct
348  * @ent: entry in ixgb_pci_tbl
349  *
350  * Returns 0 on success, negative on failure
351  *
352  * ixgb_probe initializes an adapter identified by a pci_dev structure.
353  * The OS initialization, configuring of the adapter private structure,
354  * and a hardware reset occur.
355  **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev,
359                 const struct pci_device_id *ent)
360 {
361         struct net_device *netdev = NULL;
362         struct ixgb_adapter *adapter;
363         static int cards_found = 0;
364         int pci_using_dac;
365         int i;
366         int err;
367
368         if((err = pci_enable_device(pdev)))
369                 return err;
370
371         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
372            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
373                 pci_using_dac = 1;
374         } else {
375                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
376                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
377                         printk(KERN_ERR
378                          "ixgb: No usable DMA configuration, aborting\n");
379                         goto err_dma_mask;
380                 }
381                 pci_using_dac = 0;
382         }
383
384         if((err = pci_request_regions(pdev, ixgb_driver_name)))
385                 goto err_request_regions;
386
387         pci_set_master(pdev);
388
389         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
390         if(!netdev) {
391                 err = -ENOMEM;
392                 goto err_alloc_etherdev;
393         }
394
395         SET_NETDEV_DEV(netdev, &pdev->dev);
396
397         pci_set_drvdata(pdev, netdev);
398         adapter = netdev_priv(netdev);
399         adapter->netdev = netdev;
400         adapter->pdev = pdev;
401         adapter->hw.back = adapter;
402         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
403
404         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
405                                       pci_resource_len(pdev, BAR_0));
406         if (!adapter->hw.hw_addr) {
407                 err = -EIO;
408                 goto err_ioremap;
409         }
410
411         for(i = BAR_1; i <= BAR_5; i++) {
412                 if(pci_resource_len(pdev, i) == 0)
413                         continue;
414                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
415                         adapter->hw.io_base = pci_resource_start(pdev, i);
416                         break;
417                 }
418         }
419
420         netdev->open = &ixgb_open;
421         netdev->stop = &ixgb_close;
422         netdev->hard_start_xmit = &ixgb_xmit_frame;
423         netdev->get_stats = &ixgb_get_stats;
424         netdev->set_multicast_list = &ixgb_set_multi;
425         netdev->set_mac_address = &ixgb_set_mac;
426         netdev->change_mtu = &ixgb_change_mtu;
427         ixgb_set_ethtool_ops(netdev);
428         netdev->tx_timeout = &ixgb_tx_timeout;
429         netdev->watchdog_timeo = 5 * HZ;
430 #ifdef CONFIG_IXGB_NAPI
431         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
432 #endif
433         netdev->vlan_rx_register = ixgb_vlan_rx_register;
434         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
435         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
436 #ifdef CONFIG_NET_POLL_CONTROLLER
437         netdev->poll_controller = ixgb_netpoll;
438 #endif
439
440         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
441
442         adapter->bd_number = cards_found;
443         adapter->link_speed = 0;
444         adapter->link_duplex = 0;
445
446         /* setup the private structure */
447
448         if((err = ixgb_sw_init(adapter)))
449                 goto err_sw_init;
450
451         netdev->features = NETIF_F_SG |
452                            NETIF_F_HW_CSUM |
453                            NETIF_F_HW_VLAN_TX |
454                            NETIF_F_HW_VLAN_RX |
455                            NETIF_F_HW_VLAN_FILTER;
456         netdev->features |= NETIF_F_TSO;
457
458         if(pci_using_dac)
459                 netdev->features |= NETIF_F_HIGHDMA;
460
461         /* make sure the EEPROM is good */
462
463         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
464                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
465                 err = -EIO;
466                 goto err_eeprom;
467         }
468
469         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
470         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
471
472         if(!is_valid_ether_addr(netdev->perm_addr)) {
473                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
474                 err = -EIO;
475                 goto err_eeprom;
476         }
477
478         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
479
480         init_timer(&adapter->watchdog_timer);
481         adapter->watchdog_timer.function = &ixgb_watchdog;
482         adapter->watchdog_timer.data = (unsigned long)adapter;
483
484         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
485
486         strcpy(netdev->name, "eth%d");
487         if((err = register_netdev(netdev)))
488                 goto err_register;
489
490         /* we're going to reset, so assume we have no link for now */
491
492         netif_carrier_off(netdev);
493         netif_stop_queue(netdev);
494
495         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
496         ixgb_check_options(adapter);
497         /* reset the hardware with the new settings */
498
499         ixgb_reset(adapter);
500
501         cards_found++;
502         return 0;
503
504 err_register:
505 err_sw_init:
506 err_eeprom:
507         iounmap(adapter->hw.hw_addr);
508 err_ioremap:
509         free_netdev(netdev);
510 err_alloc_etherdev:
511         pci_release_regions(pdev);
512 err_request_regions:
513 err_dma_mask:
514         pci_disable_device(pdev);
515         return err;
516 }
517
518 /**
519  * ixgb_remove - Device Removal Routine
520  * @pdev: PCI device information struct
521  *
522  * ixgb_remove is called by the PCI subsystem to alert the driver
523  * that it should release a PCI device.  The could be caused by a
524  * Hot-Plug event, or because the driver is going to be removed from
525  * memory.
526  **/
527
528 static void __devexit
529 ixgb_remove(struct pci_dev *pdev)
530 {
531         struct net_device *netdev = pci_get_drvdata(pdev);
532         struct ixgb_adapter *adapter = netdev_priv(netdev);
533
534         flush_scheduled_work();
535
536         unregister_netdev(netdev);
537
538         iounmap(adapter->hw.hw_addr);
539         pci_release_regions(pdev);
540
541         free_netdev(netdev);
542 }
543
544 /**
545  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
546  * @adapter: board private structure to initialize
547  *
548  * ixgb_sw_init initializes the Adapter private data structure.
549  * Fields are initialized based on PCI device information and
550  * OS network device settings (MTU size).
551  **/
552
553 static int __devinit
554 ixgb_sw_init(struct ixgb_adapter *adapter)
555 {
556         struct ixgb_hw *hw = &adapter->hw;
557         struct net_device *netdev = adapter->netdev;
558         struct pci_dev *pdev = adapter->pdev;
559
560         /* PCI config space info */
561
562         hw->vendor_id = pdev->vendor;
563         hw->device_id = pdev->device;
564         hw->subsystem_vendor_id = pdev->subsystem_vendor;
565         hw->subsystem_id = pdev->subsystem_device;
566
567         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
568         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
569
570         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
571            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
572            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
573            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
574                         hw->mac_type = ixgb_82597;
575         else {
576                 /* should never have loaded on this device */
577                 DPRINTK(PROBE, ERR, "unsupported device id\n");
578         }
579
580         /* enable flow control to be programmed */
581         hw->fc.send_xon = 1;
582
583         set_bit(__IXGB_DOWN, &adapter->flags);
584         return 0;
585 }
586
587 /**
588  * ixgb_open - Called when a network interface is made active
589  * @netdev: network interface device structure
590  *
591  * Returns 0 on success, negative value on failure
592  *
593  * The open entry point is called when a network interface is made
594  * active by the system (IFF_UP).  At this point all resources needed
595  * for transmit and receive operations are allocated, the interrupt
596  * handler is registered with the OS, the watchdog timer is started,
597  * and the stack is notified that the interface is ready.
598  **/
599
600 static int
601 ixgb_open(struct net_device *netdev)
602 {
603         struct ixgb_adapter *adapter = netdev_priv(netdev);
604         int err;
605
606         /* allocate transmit descriptors */
607
608         if((err = ixgb_setup_tx_resources(adapter)))
609                 goto err_setup_tx;
610
611         /* allocate receive descriptors */
612
613         if((err = ixgb_setup_rx_resources(adapter)))
614                 goto err_setup_rx;
615
616         if((err = ixgb_up(adapter)))
617                 goto err_up;
618
619         return 0;
620
621 err_up:
622         ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624         ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626         ixgb_reset(adapter);
627
628         return err;
629 }
630
631 /**
632  * ixgb_close - Disables a network interface
633  * @netdev: network interface device structure
634  *
635  * Returns 0, this is not allowed to fail
636  *
637  * The close entry point is called when an interface is de-activated
638  * by the OS.  The hardware is still under the drivers control, but
639  * needs to be disabled.  A global MAC reset is issued to stop the
640  * hardware, and all transmit and receive resources are freed.
641  **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646         struct ixgb_adapter *adapter = netdev_priv(netdev);
647
648         ixgb_down(adapter, true);
649
650         ixgb_free_tx_resources(adapter);
651         ixgb_free_rx_resources(adapter);
652
653         return 0;
654 }
655
656 /**
657  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658  * @adapter: board private structure
659  *
660  * Return 0 on success, negative on failure
661  **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667         struct pci_dev *pdev = adapter->pdev;
668         int size;
669
670         size = sizeof(struct ixgb_buffer) * txdr->count;
671         txdr->buffer_info = vmalloc(size);
672         if(!txdr->buffer_info) {
673                 DPRINTK(PROBE, ERR,
674                  "Unable to allocate transmit descriptor ring memory\n");
675                 return -ENOMEM;
676         }
677         memset(txdr->buffer_info, 0, size);
678
679         /* round up to nearest 4K */
680
681         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
682         txdr->size = ALIGN(txdr->size, 4096);
683
684         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
685         if(!txdr->desc) {
686                 vfree(txdr->buffer_info);
687                 DPRINTK(PROBE, ERR,
688                  "Unable to allocate transmit descriptor memory\n");
689                 return -ENOMEM;
690         }
691         memset(txdr->desc, 0, txdr->size);
692
693         txdr->next_to_use = 0;
694         txdr->next_to_clean = 0;
695
696         return 0;
697 }
698
699 /**
700  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
701  * @adapter: board private structure
702  *
703  * Configure the Tx unit of the MAC after a reset.
704  **/
705
706 static void
707 ixgb_configure_tx(struct ixgb_adapter *adapter)
708 {
709         u64 tdba = adapter->tx_ring.dma;
710         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
711         u32 tctl;
712         struct ixgb_hw *hw = &adapter->hw;
713
714         /* Setup the Base and Length of the Tx Descriptor Ring 
715          * tx_ring.dma can be either a 32 or 64 bit value 
716          */
717
718         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
719         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
720
721         IXGB_WRITE_REG(hw, TDLEN, tdlen);
722
723         /* Setup the HW Tx Head and Tail descriptor pointers */
724
725         IXGB_WRITE_REG(hw, TDH, 0);
726         IXGB_WRITE_REG(hw, TDT, 0);
727
728         /* don't set up txdctl, it induces performance problems if configured
729          * incorrectly */
730         /* Set the Tx Interrupt Delay register */
731
732         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
733
734         /* Program the Transmit Control Register */
735
736         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
737         IXGB_WRITE_REG(hw, TCTL, tctl);
738
739         /* Setup Transmit Descriptor Settings for this adapter */
740         adapter->tx_cmd_type =
741                 IXGB_TX_DESC_TYPE 
742                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
743 }
744
745 /**
746  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
747  * @adapter: board private structure
748  *
749  * Returns 0 on success, negative on failure
750  **/
751
752 int
753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
754 {
755         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
756         struct pci_dev *pdev = adapter->pdev;
757         int size;
758
759         size = sizeof(struct ixgb_buffer) * rxdr->count;
760         rxdr->buffer_info = vmalloc(size);
761         if(!rxdr->buffer_info) {
762                 DPRINTK(PROBE, ERR,
763                  "Unable to allocate receive descriptor ring\n");
764                 return -ENOMEM;
765         }
766         memset(rxdr->buffer_info, 0, size);
767
768         /* Round up to nearest 4K */
769
770         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
771         rxdr->size = ALIGN(rxdr->size, 4096);
772
773         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
774
775         if(!rxdr->desc) {
776                 vfree(rxdr->buffer_info);
777                 DPRINTK(PROBE, ERR,
778                  "Unable to allocate receive descriptors\n");
779                 return -ENOMEM;
780         }
781         memset(rxdr->desc, 0, rxdr->size);
782
783         rxdr->next_to_clean = 0;
784         rxdr->next_to_use = 0;
785
786         return 0;
787 }
788
789 /**
790  * ixgb_setup_rctl - configure the receive control register
791  * @adapter: Board private structure
792  **/
793
794 static void
795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
796 {
797         u32 rctl;
798
799         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
800
801         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
802
803         rctl |=
804                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
805                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
806                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
807
808         rctl |= IXGB_RCTL_SECRC;
809
810         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
811                 rctl |= IXGB_RCTL_BSIZE_2048;
812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
813                 rctl |= IXGB_RCTL_BSIZE_4096;
814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
815                 rctl |= IXGB_RCTL_BSIZE_8192;
816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
817                 rctl |= IXGB_RCTL_BSIZE_16384;
818
819         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
820 }
821
822 /**
823  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
824  * @adapter: board private structure
825  *
826  * Configure the Rx unit of the MAC after a reset.
827  **/
828
829 static void
830 ixgb_configure_rx(struct ixgb_adapter *adapter)
831 {
832         u64 rdba = adapter->rx_ring.dma;
833         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
834         struct ixgb_hw *hw = &adapter->hw;
835         u32 rctl;
836         u32 rxcsum;
837
838         /* make sure receives are disabled while setting up the descriptors */
839
840         rctl = IXGB_READ_REG(hw, RCTL);
841         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
842
843         /* set the Receive Delay Timer Register */
844
845         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
846
847         /* Setup the Base and Length of the Rx Descriptor Ring */
848
849         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
850         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
851
852         IXGB_WRITE_REG(hw, RDLEN, rdlen);
853
854         /* Setup the HW Rx Head and Tail Descriptor Pointers */
855         IXGB_WRITE_REG(hw, RDH, 0);
856         IXGB_WRITE_REG(hw, RDT, 0);
857
858         /* due to the hardware errata with RXDCTL, we are unable to use any of
859          * the performance enhancing features of it without causing other
860          * subtle bugs, some of the bugs could include receive length
861          * corruption at high data rates (WTHRESH > 0) and/or receive
862          * descriptor ring irregularites (particularly in hardware cache) */
863         IXGB_WRITE_REG(hw, RXDCTL, 0);
864
865         /* Enable Receive Checksum Offload for TCP and UDP */
866         if (adapter->rx_csum) {
867                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
868                 rxcsum |= IXGB_RXCSUM_TUOFL;
869                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
870         }
871
872         /* Enable Receives */
873
874         IXGB_WRITE_REG(hw, RCTL, rctl);
875 }
876
877 /**
878  * ixgb_free_tx_resources - Free Tx Resources
879  * @adapter: board private structure
880  *
881  * Free all transmit software resources
882  **/
883
884 void
885 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
886 {
887         struct pci_dev *pdev = adapter->pdev;
888
889         ixgb_clean_tx_ring(adapter);
890
891         vfree(adapter->tx_ring.buffer_info);
892         adapter->tx_ring.buffer_info = NULL;
893
894         pci_free_consistent(pdev, adapter->tx_ring.size,
895                             adapter->tx_ring.desc, adapter->tx_ring.dma);
896
897         adapter->tx_ring.desc = NULL;
898 }
899
900 static void
901 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
902                                         struct ixgb_buffer *buffer_info)
903 {
904         struct pci_dev *pdev = adapter->pdev;
905
906         if (buffer_info->dma)
907                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
908                                PCI_DMA_TODEVICE);
909
910         if (buffer_info->skb)
911                 dev_kfree_skb_any(buffer_info->skb);
912
913         buffer_info->skb = NULL;
914         buffer_info->dma = 0;
915         buffer_info->time_stamp = 0;
916         /* these fields must always be initialized in tx
917          * buffer_info->length = 0;
918          * buffer_info->next_to_watch = 0; */
919 }
920
921 /**
922  * ixgb_clean_tx_ring - Free Tx Buffers
923  * @adapter: board private structure
924  **/
925
926 static void
927 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
928 {
929         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
930         struct ixgb_buffer *buffer_info;
931         unsigned long size;
932         unsigned int i;
933
934         /* Free all the Tx ring sk_buffs */
935
936         for(i = 0; i < tx_ring->count; i++) {
937                 buffer_info = &tx_ring->buffer_info[i];
938                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
939         }
940
941         size = sizeof(struct ixgb_buffer) * tx_ring->count;
942         memset(tx_ring->buffer_info, 0, size);
943
944         /* Zero out the descriptor ring */
945
946         memset(tx_ring->desc, 0, tx_ring->size);
947
948         tx_ring->next_to_use = 0;
949         tx_ring->next_to_clean = 0;
950
951         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
952         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
953 }
954
955 /**
956  * ixgb_free_rx_resources - Free Rx Resources
957  * @adapter: board private structure
958  *
959  * Free all receive software resources
960  **/
961
962 void
963 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
964 {
965         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
966         struct pci_dev *pdev = adapter->pdev;
967
968         ixgb_clean_rx_ring(adapter);
969
970         vfree(rx_ring->buffer_info);
971         rx_ring->buffer_info = NULL;
972
973         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
974
975         rx_ring->desc = NULL;
976 }
977
978 /**
979  * ixgb_clean_rx_ring - Free Rx Buffers
980  * @adapter: board private structure
981  **/
982
983 static void
984 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
985 {
986         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
987         struct ixgb_buffer *buffer_info;
988         struct pci_dev *pdev = adapter->pdev;
989         unsigned long size;
990         unsigned int i;
991
992         /* Free all the Rx ring sk_buffs */
993
994         for(i = 0; i < rx_ring->count; i++) {
995                 buffer_info = &rx_ring->buffer_info[i];
996                 if(buffer_info->skb) {
997
998                         pci_unmap_single(pdev,
999                                          buffer_info->dma,
1000                                          buffer_info->length,
1001                                          PCI_DMA_FROMDEVICE);
1002
1003                         dev_kfree_skb(buffer_info->skb);
1004
1005                         buffer_info->skb = NULL;
1006                 }
1007         }
1008
1009         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1010         memset(rx_ring->buffer_info, 0, size);
1011
1012         /* Zero out the descriptor ring */
1013
1014         memset(rx_ring->desc, 0, rx_ring->size);
1015
1016         rx_ring->next_to_clean = 0;
1017         rx_ring->next_to_use = 0;
1018
1019         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1020         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1021 }
1022
1023 /**
1024  * ixgb_set_mac - Change the Ethernet Address of the NIC
1025  * @netdev: network interface device structure
1026  * @p: pointer to an address structure
1027  *
1028  * Returns 0 on success, negative on failure
1029  **/
1030
1031 static int
1032 ixgb_set_mac(struct net_device *netdev, void *p)
1033 {
1034         struct ixgb_adapter *adapter = netdev_priv(netdev);
1035         struct sockaddr *addr = p;
1036
1037         if(!is_valid_ether_addr(addr->sa_data))
1038                 return -EADDRNOTAVAIL;
1039
1040         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1041
1042         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1043
1044         return 0;
1045 }
1046
1047 /**
1048  * ixgb_set_multi - Multicast and Promiscuous mode set
1049  * @netdev: network interface device structure
1050  *
1051  * The set_multi entry point is called whenever the multicast address
1052  * list or the network interface flags are updated.  This routine is
1053  * responsible for configuring the hardware for proper multicast,
1054  * promiscuous mode, and all-multi behavior.
1055  **/
1056
1057 static void
1058 ixgb_set_multi(struct net_device *netdev)
1059 {
1060         struct ixgb_adapter *adapter = netdev_priv(netdev);
1061         struct ixgb_hw *hw = &adapter->hw;
1062         struct dev_mc_list *mc_ptr;
1063         u32 rctl;
1064         int i;
1065
1066         /* Check for Promiscuous and All Multicast modes */
1067
1068         rctl = IXGB_READ_REG(hw, RCTL);
1069
1070         if(netdev->flags & IFF_PROMISC) {
1071                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1072         } else if(netdev->flags & IFF_ALLMULTI) {
1073                 rctl |= IXGB_RCTL_MPE;
1074                 rctl &= ~IXGB_RCTL_UPE;
1075         } else {
1076                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077         }
1078
1079         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1080                 rctl |= IXGB_RCTL_MPE;
1081                 IXGB_WRITE_REG(hw, RCTL, rctl);
1082         } else {
1083                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1084                             IXGB_ETH_LENGTH_OF_ADDRESS];
1085
1086                 IXGB_WRITE_REG(hw, RCTL, rctl);
1087
1088                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1089                         i++, mc_ptr = mc_ptr->next)
1090                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1091                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1092
1093                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1094         }
1095 }
1096
1097 /**
1098  * ixgb_watchdog - Timer Call-back
1099  * @data: pointer to netdev cast into an unsigned long
1100  **/
1101
1102 static void
1103 ixgb_watchdog(unsigned long data)
1104 {
1105         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1106         struct net_device *netdev = adapter->netdev;
1107         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1108
1109         ixgb_check_for_link(&adapter->hw);
1110
1111         if (ixgb_check_for_bad_link(&adapter->hw)) {
1112                 /* force the reset path */
1113                 netif_stop_queue(netdev);
1114         }
1115
1116         if(adapter->hw.link_up) {
1117                 if(!netif_carrier_ok(netdev)) {
1118                         DPRINTK(LINK, INFO,
1119                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1120                         adapter->link_speed = 10000;
1121                         adapter->link_duplex = FULL_DUPLEX;
1122                         netif_carrier_on(netdev);
1123                         netif_wake_queue(netdev);
1124                 }
1125         } else {
1126                 if(netif_carrier_ok(netdev)) {
1127                         adapter->link_speed = 0;
1128                         adapter->link_duplex = 0;
1129                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1130                         netif_carrier_off(netdev);
1131                         netif_stop_queue(netdev);
1132
1133                 }
1134         }
1135
1136         ixgb_update_stats(adapter);
1137
1138         if(!netif_carrier_ok(netdev)) {
1139                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1140                         /* We've lost link, so the controller stops DMA,
1141                          * but we've got queued Tx work that's never going
1142                          * to get done, so reset controller to flush Tx.
1143                          * (Do the reset outside of interrupt context). */
1144                         schedule_work(&adapter->tx_timeout_task);
1145                 }
1146         }
1147
1148         /* Force detection of hung controller every watchdog period */
1149         adapter->detect_tx_hung = true;
1150
1151         /* generate an interrupt to force clean up of any stragglers */
1152         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1153
1154         /* Reset the timer */
1155         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1156 }
1157
1158 #define IXGB_TX_FLAGS_CSUM              0x00000001
1159 #define IXGB_TX_FLAGS_VLAN              0x00000002
1160 #define IXGB_TX_FLAGS_TSO               0x00000004
1161
1162 static int
1163 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1164 {
1165         struct ixgb_context_desc *context_desc;
1166         unsigned int i;
1167         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1168         u16 ipcse, tucse, mss;
1169         int err;
1170
1171         if (likely(skb_is_gso(skb))) {
1172                 struct ixgb_buffer *buffer_info;
1173                 struct iphdr *iph;
1174
1175                 if (skb_header_cloned(skb)) {
1176                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1177                         if (err)
1178                                 return err;
1179                 }
1180
1181                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1182                 mss = skb_shinfo(skb)->gso_size;
1183                 iph = ip_hdr(skb);
1184                 iph->tot_len = 0;
1185                 iph->check = 0;
1186                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1187                                                          iph->daddr, 0,
1188                                                          IPPROTO_TCP, 0);
1189                 ipcss = skb_network_offset(skb);
1190                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1191                 ipcse = skb_transport_offset(skb) - 1;
1192                 tucss = skb_transport_offset(skb);
1193                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1194                 tucse = 0;
1195
1196                 i = adapter->tx_ring.next_to_use;
1197                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1198                 buffer_info = &adapter->tx_ring.buffer_info[i];
1199                 WARN_ON(buffer_info->dma != 0);
1200
1201                 context_desc->ipcss = ipcss;
1202                 context_desc->ipcso = ipcso;
1203                 context_desc->ipcse = cpu_to_le16(ipcse);
1204                 context_desc->tucss = tucss;
1205                 context_desc->tucso = tucso;
1206                 context_desc->tucse = cpu_to_le16(tucse);
1207                 context_desc->mss = cpu_to_le16(mss);
1208                 context_desc->hdr_len = hdr_len;
1209                 context_desc->status = 0;
1210                 context_desc->cmd_type_len = cpu_to_le32(
1211                                                   IXGB_CONTEXT_DESC_TYPE 
1212                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1213                                                 | IXGB_CONTEXT_DESC_CMD_IP
1214                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1215                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1216                                                 | (skb->len - (hdr_len)));
1217
1218
1219                 if(++i == adapter->tx_ring.count) i = 0;
1220                 adapter->tx_ring.next_to_use = i;
1221
1222                 return 1;
1223         }
1224
1225         return 0;
1226 }
1227
1228 static bool
1229 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1230 {
1231         struct ixgb_context_desc *context_desc;
1232         unsigned int i;
1233         u8 css, cso;
1234
1235         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1236                 struct ixgb_buffer *buffer_info;
1237                 css = skb_transport_offset(skb);
1238                 cso = css + skb->csum_offset;
1239
1240                 i = adapter->tx_ring.next_to_use;
1241                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1242                 buffer_info = &adapter->tx_ring.buffer_info[i];
1243                 WARN_ON(buffer_info->dma != 0);
1244
1245                 context_desc->tucss = css;
1246                 context_desc->tucso = cso;
1247                 context_desc->tucse = 0;
1248                 /* zero out any previously existing data in one instruction */
1249                 *(u32 *)&(context_desc->ipcss) = 0;
1250                 context_desc->status = 0;
1251                 context_desc->hdr_len = 0;
1252                 context_desc->mss = 0;
1253                 context_desc->cmd_type_len =
1254                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1255                                     | IXGB_TX_DESC_CMD_IDE);
1256
1257                 if(++i == adapter->tx_ring.count) i = 0;
1258                 adapter->tx_ring.next_to_use = i;
1259
1260                 return true;
1261         }
1262
1263         return false;
1264 }
1265
1266 #define IXGB_MAX_TXD_PWR        14
1267 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1268
1269 static int
1270 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1271             unsigned int first)
1272 {
1273         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1274         struct ixgb_buffer *buffer_info;
1275         int len = skb->len;
1276         unsigned int offset = 0, size, count = 0, i;
1277         unsigned int mss = skb_shinfo(skb)->gso_size;
1278
1279         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1280         unsigned int f;
1281
1282         len -= skb->data_len;
1283
1284         i = tx_ring->next_to_use;
1285
1286         while(len) {
1287                 buffer_info = &tx_ring->buffer_info[i];
1288                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1289                 /* Workaround for premature desc write-backs
1290                  * in TSO mode.  Append 4-byte sentinel desc */
1291                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1292                         size -= 4;
1293
1294                 buffer_info->length = size;
1295                 WARN_ON(buffer_info->dma != 0);
1296                 buffer_info->time_stamp = jiffies;
1297                 buffer_info->dma =
1298                         pci_map_single(adapter->pdev,
1299                                 skb->data + offset,
1300                                 size,
1301                                 PCI_DMA_TODEVICE);
1302                 buffer_info->next_to_watch = 0;
1303
1304                 len -= size;
1305                 offset += size;
1306                 count++;
1307                 if(++i == tx_ring->count) i = 0;
1308         }
1309
1310         for(f = 0; f < nr_frags; f++) {
1311                 struct skb_frag_struct *frag;
1312
1313                 frag = &skb_shinfo(skb)->frags[f];
1314                 len = frag->size;
1315                 offset = 0;
1316
1317                 while(len) {
1318                         buffer_info = &tx_ring->buffer_info[i];
1319                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1320
1321                         /* Workaround for premature desc write-backs
1322                          * in TSO mode.  Append 4-byte sentinel desc */
1323                         if (unlikely(mss && (f == (nr_frags - 1))
1324                                      && size == len && size > 8))
1325                                 size -= 4;
1326
1327                         buffer_info->length = size;
1328                         buffer_info->time_stamp = jiffies;
1329                         buffer_info->dma =
1330                                 pci_map_page(adapter->pdev,
1331                                         frag->page,
1332                                         frag->page_offset + offset,
1333                                         size,
1334                                         PCI_DMA_TODEVICE);
1335                         buffer_info->next_to_watch = 0;
1336
1337                         len -= size;
1338                         offset += size;
1339                         count++;
1340                         if(++i == tx_ring->count) i = 0;
1341                 }
1342         }
1343         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1344         tx_ring->buffer_info[i].skb = skb;
1345         tx_ring->buffer_info[first].next_to_watch = i;
1346
1347         return count;
1348 }
1349
1350 static void
1351 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1352 {
1353         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1354         struct ixgb_tx_desc *tx_desc = NULL;
1355         struct ixgb_buffer *buffer_info;
1356         u32 cmd_type_len = adapter->tx_cmd_type;
1357         u8 status = 0;
1358         u8 popts = 0;
1359         unsigned int i;
1360
1361         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1362                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1363                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1364         }
1365
1366         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1367                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1368
1369         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1370                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1371         }
1372
1373         i = tx_ring->next_to_use;
1374
1375         while(count--) {
1376                 buffer_info = &tx_ring->buffer_info[i];
1377                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1378                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1379                 tx_desc->cmd_type_len =
1380                         cpu_to_le32(cmd_type_len | buffer_info->length);
1381                 tx_desc->status = status;
1382                 tx_desc->popts = popts;
1383                 tx_desc->vlan = cpu_to_le16(vlan_id);
1384
1385                 if(++i == tx_ring->count) i = 0;
1386         }
1387
1388         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1389                                 | IXGB_TX_DESC_CMD_RS );
1390
1391         /* Force memory writes to complete before letting h/w
1392          * know there are new descriptors to fetch.  (Only
1393          * applicable for weak-ordered memory model archs,
1394          * such as IA-64). */
1395         wmb();
1396
1397         tx_ring->next_to_use = i;
1398         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1399 }
1400
1401 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1402 {
1403         struct ixgb_adapter *adapter = netdev_priv(netdev);
1404         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1405
1406         netif_stop_queue(netdev);
1407         /* Herbert's original patch had:
1408          *  smp_mb__after_netif_stop_queue();
1409          * but since that doesn't exist yet, just open code it. */
1410         smp_mb();
1411
1412         /* We need to check again in a case another CPU has just
1413          * made room available. */
1414         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1415                 return -EBUSY;
1416
1417         /* A reprieve! */
1418         netif_start_queue(netdev);
1419         ++adapter->restart_queue;
1420         return 0;
1421 }
1422
1423 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1424                               struct ixgb_desc_ring *tx_ring, int size)
1425 {
1426         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1427                 return 0;
1428         return __ixgb_maybe_stop_tx(netdev, size);
1429 }
1430
1431
1432 /* Tx Descriptors needed, worst case */
1433 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1434                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1435 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1436         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1437         + 1 /* one more needed for sentinel TSO workaround */
1438
1439 static int
1440 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1441 {
1442         struct ixgb_adapter *adapter = netdev_priv(netdev);
1443         unsigned int first;
1444         unsigned int tx_flags = 0;
1445         int vlan_id = 0;
1446         int tso;
1447
1448         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1449                 dev_kfree_skb(skb);
1450                 return NETDEV_TX_OK;
1451         }
1452
1453         if(skb->len <= 0) {
1454                 dev_kfree_skb_any(skb);
1455                 return 0;
1456         }
1457
1458         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1459                      DESC_NEEDED)))
1460                 return NETDEV_TX_BUSY;
1461
1462         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1463                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1464                 vlan_id = vlan_tx_tag_get(skb);
1465         }
1466
1467         first = adapter->tx_ring.next_to_use;
1468         
1469         tso = ixgb_tso(adapter, skb);
1470         if (tso < 0) {
1471                 dev_kfree_skb_any(skb);
1472                 return NETDEV_TX_OK;
1473         }
1474
1475         if (likely(tso))
1476                 tx_flags |= IXGB_TX_FLAGS_TSO;
1477         else if(ixgb_tx_csum(adapter, skb))
1478                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1479
1480         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1481                         tx_flags);
1482
1483         netdev->trans_start = jiffies;
1484
1485         /* Make sure there is space in the ring for the next send. */
1486         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1487
1488         return NETDEV_TX_OK;
1489 }
1490
1491 /**
1492  * ixgb_tx_timeout - Respond to a Tx Hang
1493  * @netdev: network interface device structure
1494  **/
1495
1496 static void
1497 ixgb_tx_timeout(struct net_device *netdev)
1498 {
1499         struct ixgb_adapter *adapter = netdev_priv(netdev);
1500
1501         /* Do the reset outside of interrupt context */
1502         schedule_work(&adapter->tx_timeout_task);
1503 }
1504
1505 static void
1506 ixgb_tx_timeout_task(struct work_struct *work)
1507 {
1508         struct ixgb_adapter *adapter =
1509                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1510
1511         adapter->tx_timeout_count++;
1512         ixgb_down(adapter, true);
1513         ixgb_up(adapter);
1514 }
1515
1516 /**
1517  * ixgb_get_stats - Get System Network Statistics
1518  * @netdev: network interface device structure
1519  *
1520  * Returns the address of the device statistics structure.
1521  * The statistics are actually updated from the timer callback.
1522  **/
1523
1524 static struct net_device_stats *
1525 ixgb_get_stats(struct net_device *netdev)
1526 {
1527         struct ixgb_adapter *adapter = netdev_priv(netdev);
1528
1529         return &adapter->net_stats;
1530 }
1531
1532 /**
1533  * ixgb_change_mtu - Change the Maximum Transfer Unit
1534  * @netdev: network interface device structure
1535  * @new_mtu: new value for maximum frame size
1536  *
1537  * Returns 0 on success, negative on failure
1538  **/
1539
1540 static int
1541 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1542 {
1543         struct ixgb_adapter *adapter = netdev_priv(netdev);
1544         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1545         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1546
1547         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1548         if ((new_mtu < 68) ||
1549             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1550                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1551                 return -EINVAL;
1552         }
1553
1554         if (old_max_frame == max_frame)
1555                 return 0;
1556
1557         if (netif_running(netdev))
1558                 ixgb_down(adapter, true);
1559
1560         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1561
1562         netdev->mtu = new_mtu;
1563
1564         if (netif_running(netdev))
1565                 ixgb_up(adapter);
1566
1567         return 0;
1568 }
1569
1570 /**
1571  * ixgb_update_stats - Update the board statistics counters.
1572  * @adapter: board private structure
1573  **/
1574
1575 void
1576 ixgb_update_stats(struct ixgb_adapter *adapter)
1577 {
1578         struct net_device *netdev = adapter->netdev;
1579         struct pci_dev *pdev = adapter->pdev;
1580
1581         /* Prevent stats update while adapter is being reset */
1582         if (pci_channel_offline(pdev))
1583                 return;
1584
1585         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1586            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1587                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1588                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1589                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1590                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1591
1592                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1593                 /* fix up multicast stats by removing broadcasts */
1594                 if(multi >= bcast)
1595                         multi -= bcast;
1596                 
1597                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1598                 adapter->stats.mprch += (multi >> 32);
1599                 adapter->stats.bprcl += bcast_l; 
1600                 adapter->stats.bprch += bcast_h;
1601         } else {
1602                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1603                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1604                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1605                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1606         }
1607         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1608         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1609         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1610         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1611         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1612         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1613         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1614         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1615         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1616         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1617         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1618         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1619         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1620         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1621         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1622         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1623         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1624         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1625         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1626         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1627         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1628         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1629         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1630         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1631         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1632         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1633         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1634         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1635         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1636         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1637         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1638         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1639         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1640         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1641         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1642         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1643         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1644         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1645         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1646         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1647         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1648         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1649         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1650         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1651         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1652         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1653         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1654         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1655         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1656         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1657         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1658         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1659         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1660         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1661         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1662         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1663
1664         /* Fill out the OS statistics structure */
1665
1666         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1667         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1668         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1669         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1670         adapter->net_stats.multicast = adapter->stats.mprcl;
1671         adapter->net_stats.collisions = 0;
1672
1673         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1674          * with a length in the type/len field */
1675         adapter->net_stats.rx_errors =
1676             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1677             adapter->stats.ruc +
1678             adapter->stats.roc /*+ adapter->stats.rlec */  +
1679             adapter->stats.icbc +
1680             adapter->stats.ecbc + adapter->stats.mpc;
1681
1682         /* see above
1683          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1684          */
1685
1686         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1687         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1688         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1689         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1690
1691         adapter->net_stats.tx_errors = 0;
1692         adapter->net_stats.rx_frame_errors = 0;
1693         adapter->net_stats.tx_aborted_errors = 0;
1694         adapter->net_stats.tx_carrier_errors = 0;
1695         adapter->net_stats.tx_fifo_errors = 0;
1696         adapter->net_stats.tx_heartbeat_errors = 0;
1697         adapter->net_stats.tx_window_errors = 0;
1698 }
1699
1700 #define IXGB_MAX_INTR 10
1701 /**
1702  * ixgb_intr - Interrupt Handler
1703  * @irq: interrupt number
1704  * @data: pointer to a network interface device structure
1705  **/
1706
1707 static irqreturn_t
1708 ixgb_intr(int irq, void *data)
1709 {
1710         struct net_device *netdev = data;
1711         struct ixgb_adapter *adapter = netdev_priv(netdev);
1712         struct ixgb_hw *hw = &adapter->hw;
1713         u32 icr = IXGB_READ_REG(hw, ICR);
1714 #ifndef CONFIG_IXGB_NAPI
1715         unsigned int i;
1716 #endif
1717
1718         if(unlikely(!icr))
1719                 return IRQ_NONE;  /* Not our interrupt */
1720
1721         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1722                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1723                         mod_timer(&adapter->watchdog_timer, jiffies);
1724
1725 #ifdef CONFIG_IXGB_NAPI
1726         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1727
1728                 /* Disable interrupts and register for poll. The flush 
1729                   of the posted write is intentionally left out.
1730                 */
1731
1732                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1733                 __netif_rx_schedule(netdev, &adapter->napi);
1734         }
1735 #else
1736         /* yes, that is actually a & and it is meant to make sure that
1737          * every pass through this for loop checks both receive and
1738          * transmit queues for completed descriptors, intended to
1739          * avoid starvation issues and assist tx/rx fairness. */
1740         for(i = 0; i < IXGB_MAX_INTR; i++)
1741                 if(!ixgb_clean_rx_irq(adapter) &
1742                    !ixgb_clean_tx_irq(adapter))
1743                         break;
1744 #endif 
1745         return IRQ_HANDLED;
1746 }
1747
1748 #ifdef CONFIG_IXGB_NAPI
1749 /**
1750  * ixgb_clean - NAPI Rx polling callback
1751  * @adapter: board private structure
1752  **/
1753
1754 static int
1755 ixgb_clean(struct napi_struct *napi, int budget)
1756 {
1757         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1758         struct net_device *netdev = adapter->netdev;
1759         int work_done = 0;
1760
1761         ixgb_clean_tx_irq(adapter);
1762         ixgb_clean_rx_irq(adapter, &work_done, budget);
1763
1764         /* If budget not fully consumed, exit the polling mode */
1765         if (work_done < budget) {
1766                 netif_rx_complete(netdev, napi);
1767                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1768                         ixgb_irq_enable(adapter);
1769         }
1770
1771         return work_done;
1772 }
1773 #endif
1774
1775 /**
1776  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1777  * @adapter: board private structure
1778  **/
1779
1780 static bool
1781 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1782 {
1783         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1784         struct net_device *netdev = adapter->netdev;
1785         struct ixgb_tx_desc *tx_desc, *eop_desc;
1786         struct ixgb_buffer *buffer_info;
1787         unsigned int i, eop;
1788         bool cleaned = false;
1789
1790         i = tx_ring->next_to_clean;
1791         eop = tx_ring->buffer_info[i].next_to_watch;
1792         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1793
1794         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1795
1796                 for (cleaned = false; !cleaned; ) {
1797                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1798                         buffer_info = &tx_ring->buffer_info[i];
1799
1800                         if (tx_desc->popts
1801                             & (IXGB_TX_DESC_POPTS_TXSM |
1802                                IXGB_TX_DESC_POPTS_IXSM))
1803                                 adapter->hw_csum_tx_good++;
1804
1805                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1806
1807                         *(u32 *)&(tx_desc->status) = 0;
1808
1809                         cleaned = (i == eop);
1810                         if(++i == tx_ring->count) i = 0;
1811                 }
1812
1813                 eop = tx_ring->buffer_info[i].next_to_watch;
1814                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1815         }
1816
1817         tx_ring->next_to_clean = i;
1818
1819         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1820                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1821                 /* Make sure that anybody stopping the queue after this
1822                  * sees the new next_to_clean. */
1823                 smp_mb();
1824
1825                 if (netif_queue_stopped(netdev) &&
1826                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1827                         netif_wake_queue(netdev);
1828                         ++adapter->restart_queue;
1829                 }
1830         }
1831
1832         if(adapter->detect_tx_hung) {
1833                 /* detect a transmit hang in hardware, this serializes the
1834                  * check with the clearing of time_stamp and movement of i */
1835                 adapter->detect_tx_hung = false;
1836                 if (tx_ring->buffer_info[eop].dma &&
1837                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1838                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1839                         IXGB_STATUS_TXOFF)) {
1840                         /* detected Tx unit hang */
1841                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1842                                         "  TDH                  <%x>\n"
1843                                         "  TDT                  <%x>\n"
1844                                         "  next_to_use          <%x>\n"
1845                                         "  next_to_clean        <%x>\n"
1846                                         "buffer_info[next_to_clean]\n"
1847                                         "  time_stamp           <%lx>\n"
1848                                         "  next_to_watch        <%x>\n"
1849                                         "  jiffies              <%lx>\n"
1850                                         "  next_to_watch.status <%x>\n",
1851                                 IXGB_READ_REG(&adapter->hw, TDH),
1852                                 IXGB_READ_REG(&adapter->hw, TDT),
1853                                 tx_ring->next_to_use,
1854                                 tx_ring->next_to_clean,
1855                                 tx_ring->buffer_info[eop].time_stamp,
1856                                 eop,
1857                                 jiffies,
1858                                 eop_desc->status);
1859                         netif_stop_queue(netdev);
1860                 }
1861         }
1862
1863         return cleaned;
1864 }
1865
1866 /**
1867  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1868  * @adapter: board private structure
1869  * @rx_desc: receive descriptor
1870  * @sk_buff: socket buffer with received data
1871  **/
1872
1873 static void
1874 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1875                  struct ixgb_rx_desc *rx_desc,
1876                  struct sk_buff *skb)
1877 {
1878         /* Ignore Checksum bit is set OR
1879          * TCP Checksum has not been calculated
1880          */
1881         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1882            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1883                 skb->ip_summed = CHECKSUM_NONE;
1884                 return;
1885         }
1886
1887         /* At this point we know the hardware did the TCP checksum */
1888         /* now look at the TCP checksum error bit */
1889         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1890                 /* let the stack verify checksum errors */
1891                 skb->ip_summed = CHECKSUM_NONE;
1892                 adapter->hw_csum_rx_error++;
1893         } else {
1894                 /* TCP checksum is good */
1895                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1896                 adapter->hw_csum_rx_good++;
1897         }
1898 }
1899
1900 /**
1901  * ixgb_clean_rx_irq - Send received data up the network stack,
1902  * @adapter: board private structure
1903  **/
1904
1905 static bool
1906 #ifdef CONFIG_IXGB_NAPI
1907 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1908 #else
1909 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1910 #endif
1911 {
1912         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1913         struct net_device *netdev = adapter->netdev;
1914         struct pci_dev *pdev = adapter->pdev;
1915         struct ixgb_rx_desc *rx_desc, *next_rxd;
1916         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1917         u32 length;
1918         unsigned int i, j;
1919         bool cleaned = false;
1920
1921         i = rx_ring->next_to_clean;
1922         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1923         buffer_info = &rx_ring->buffer_info[i];
1924
1925         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1926                 struct sk_buff *skb, *next_skb;
1927                 u8 status;
1928
1929 #ifdef CONFIG_IXGB_NAPI
1930                 if(*work_done >= work_to_do)
1931                         break;
1932
1933                 (*work_done)++;
1934 #endif
1935                 status = rx_desc->status;
1936                 skb = buffer_info->skb;
1937                 buffer_info->skb = NULL;
1938
1939                 prefetch(skb->data);
1940
1941                 if(++i == rx_ring->count) i = 0;
1942                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1943                 prefetch(next_rxd);
1944
1945                 if((j = i + 1) == rx_ring->count) j = 0;
1946                 next2_buffer = &rx_ring->buffer_info[j];
1947                 prefetch(next2_buffer);
1948
1949                 next_buffer = &rx_ring->buffer_info[i];
1950                 next_skb = next_buffer->skb;
1951                 prefetch(next_skb);
1952
1953                 cleaned = true;
1954
1955                 pci_unmap_single(pdev,
1956                                  buffer_info->dma,
1957                                  buffer_info->length,
1958                                  PCI_DMA_FROMDEVICE);
1959
1960                 length = le16_to_cpu(rx_desc->length);
1961
1962                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1963
1964                         /* All receives must fit into a single buffer */
1965
1966                         IXGB_DBG("Receive packet consumed multiple buffers "
1967                                          "length<%x>\n", length);
1968
1969                         dev_kfree_skb_irq(skb);
1970                         goto rxdesc_done;
1971                 }
1972
1973                 if (unlikely(rx_desc->errors
1974                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1975                                 | IXGB_RX_DESC_ERRORS_P |
1976                                 IXGB_RX_DESC_ERRORS_RXE))) {
1977
1978                         dev_kfree_skb_irq(skb);
1979                         goto rxdesc_done;
1980                 }
1981
1982                 /* code added for copybreak, this should improve
1983                  * performance for small packets with large amounts
1984                  * of reassembly being done in the stack */
1985                 if (length < copybreak) {
1986                         struct sk_buff *new_skb =
1987                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1988                         if (new_skb) {
1989                                 skb_reserve(new_skb, NET_IP_ALIGN);
1990                                 skb_copy_to_linear_data_offset(new_skb,
1991                                                                -NET_IP_ALIGN,
1992                                                                (skb->data -
1993                                                                 NET_IP_ALIGN),
1994                                                                (length +
1995                                                                 NET_IP_ALIGN));
1996                                 /* save the skb in buffer_info as good */
1997                                 buffer_info->skb = skb;
1998                                 skb = new_skb;
1999                         }
2000                 }
2001                 /* end copybreak code */
2002
2003                 /* Good Receive */
2004                 skb_put(skb, length);
2005
2006                 /* Receive Checksum Offload */
2007                 ixgb_rx_checksum(adapter, rx_desc, skb);
2008
2009                 skb->protocol = eth_type_trans(skb, netdev);
2010 #ifdef CONFIG_IXGB_NAPI
2011                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2012                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2013                                 le16_to_cpu(rx_desc->special));
2014                 } else {
2015                         netif_receive_skb(skb);
2016                 }
2017 #else /* CONFIG_IXGB_NAPI */
2018                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2019                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2020                                 le16_to_cpu(rx_desc->special));
2021                 } else {
2022                         netif_rx(skb);
2023                 }
2024 #endif /* CONFIG_IXGB_NAPI */
2025                 netdev->last_rx = jiffies;
2026
2027 rxdesc_done:
2028                 /* clean up descriptor, might be written over by hw */
2029                 rx_desc->status = 0;
2030
2031                 /* use prefetched values */
2032                 rx_desc = next_rxd;
2033                 buffer_info = next_buffer;
2034         }
2035
2036         rx_ring->next_to_clean = i;
2037
2038         ixgb_alloc_rx_buffers(adapter);
2039
2040         return cleaned;
2041 }
2042
2043 /**
2044  * ixgb_alloc_rx_buffers - Replace used receive buffers
2045  * @adapter: address of board private structure
2046  **/
2047
2048 static void
2049 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2050 {
2051         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2052         struct net_device *netdev = adapter->netdev;
2053         struct pci_dev *pdev = adapter->pdev;
2054         struct ixgb_rx_desc *rx_desc;
2055         struct ixgb_buffer *buffer_info;
2056         struct sk_buff *skb;
2057         unsigned int i;
2058         long cleancount;
2059
2060         i = rx_ring->next_to_use;
2061         buffer_info = &rx_ring->buffer_info[i];
2062         cleancount = IXGB_DESC_UNUSED(rx_ring);
2063
2064
2065         /* leave three descriptors unused */
2066         while(--cleancount > 2) {
2067                 /* recycle! its good for you */
2068                 skb = buffer_info->skb;
2069                 if (skb) {
2070                         skb_trim(skb, 0);
2071                         goto map_skb;
2072                 }
2073
2074                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2075                                        + NET_IP_ALIGN);
2076                 if (unlikely(!skb)) {
2077                         /* Better luck next round */
2078                         adapter->alloc_rx_buff_failed++;
2079                         break;
2080                 }
2081
2082                 /* Make buffer alignment 2 beyond a 16 byte boundary
2083                  * this will result in a 16 byte aligned IP header after
2084                  * the 14 byte MAC header is removed
2085                  */
2086                 skb_reserve(skb, NET_IP_ALIGN);
2087
2088                 buffer_info->skb = skb;
2089                 buffer_info->length = adapter->rx_buffer_len;
2090 map_skb:
2091                 buffer_info->dma = pci_map_single(pdev,
2092                                                   skb->data,
2093                                                   adapter->rx_buffer_len,
2094                                                   PCI_DMA_FROMDEVICE);
2095
2096                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2097                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2098                 /* guarantee DD bit not set now before h/w gets descriptor
2099                  * this is the rest of the workaround for h/w double 
2100                  * writeback. */
2101                 rx_desc->status = 0;
2102
2103
2104                 if(++i == rx_ring->count) i = 0;
2105                 buffer_info = &rx_ring->buffer_info[i];
2106         }
2107
2108         if (likely(rx_ring->next_to_use != i)) {
2109                 rx_ring->next_to_use = i;
2110                 if (unlikely(i-- == 0))
2111                         i = (rx_ring->count - 1);
2112
2113                 /* Force memory writes to complete before letting h/w
2114                  * know there are new descriptors to fetch.  (Only
2115                  * applicable for weak-ordered memory model archs, such
2116                  * as IA-64). */
2117                 wmb();
2118                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2119         }
2120 }
2121
2122 /**
2123  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2124  * 
2125  * @param netdev network interface device structure
2126  * @param grp indicates to enable or disable tagging/stripping
2127  **/
2128 static void
2129 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2130 {
2131         struct ixgb_adapter *adapter = netdev_priv(netdev);
2132         u32 ctrl, rctl;
2133
2134         ixgb_irq_disable(adapter);
2135         adapter->vlgrp = grp;
2136
2137         if(grp) {
2138                 /* enable VLAN tag insert/strip */
2139                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140                 ctrl |= IXGB_CTRL0_VME;
2141                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142
2143                 /* enable VLAN receive filtering */
2144
2145                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2146                 rctl |= IXGB_RCTL_VFE;
2147                 rctl &= ~IXGB_RCTL_CFIEN;
2148                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2149         } else {
2150                 /* disable VLAN tag insert/strip */
2151
2152                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2153                 ctrl &= ~IXGB_CTRL0_VME;
2154                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2155
2156                 /* disable VLAN filtering */
2157
2158                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2159                 rctl &= ~IXGB_RCTL_VFE;
2160                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2161         }
2162
2163         /* don't enable interrupts unless we are UP */
2164         if (adapter->netdev->flags & IFF_UP)
2165                 ixgb_irq_enable(adapter);
2166 }
2167
2168 static void
2169 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2170 {
2171         struct ixgb_adapter *adapter = netdev_priv(netdev);
2172         u32 vfta, index;
2173
2174         /* add VID to filter table */
2175
2176         index = (vid >> 5) & 0x7F;
2177         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2178         vfta |= (1 << (vid & 0x1F));
2179         ixgb_write_vfta(&adapter->hw, index, vfta);
2180 }
2181
2182 static void
2183 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2184 {
2185         struct ixgb_adapter *adapter = netdev_priv(netdev);
2186         u32 vfta, index;
2187
2188         ixgb_irq_disable(adapter);
2189
2190         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2191
2192         /* don't enable interrupts unless we are UP */
2193         if (adapter->netdev->flags & IFF_UP)
2194                 ixgb_irq_enable(adapter);
2195
2196         /* remove VID from filter table */
2197
2198         index = (vid >> 5) & 0x7F;
2199         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2200         vfta &= ~(1 << (vid & 0x1F));
2201         ixgb_write_vfta(&adapter->hw, index, vfta);
2202 }
2203
2204 static void
2205 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2206 {
2207         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2208
2209         if(adapter->vlgrp) {
2210                 u16 vid;
2211                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2212                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2213                                 continue;
2214                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2215                 }
2216         }
2217 }
2218
2219 #ifdef CONFIG_NET_POLL_CONTROLLER
2220 /*
2221  * Polling 'interrupt' - used by things like netconsole to send skbs
2222  * without having to re-enable interrupts. It's not called while
2223  * the interrupt routine is executing.
2224  */
2225
2226 static void ixgb_netpoll(struct net_device *dev)
2227 {
2228         struct ixgb_adapter *adapter = netdev_priv(dev);
2229
2230         disable_irq(adapter->pdev->irq);
2231         ixgb_intr(adapter->pdev->irq, dev);
2232         enable_irq(adapter->pdev->irq);
2233 }
2234 #endif
2235
2236 /**
2237  * ixgb_io_error_detected() - called when PCI error is detected
2238  * @pdev    pointer to pci device with error
2239  * @state   pci channel state after error
2240  *
2241  * This callback is called by the PCI subsystem whenever
2242  * a PCI bus error is detected.
2243  */
2244 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2245                                      enum pci_channel_state state)
2246 {
2247         struct net_device *netdev = pci_get_drvdata(pdev);
2248         struct ixgb_adapter *adapter = netdev_priv(netdev);
2249
2250         if(netif_running(netdev))
2251                 ixgb_down(adapter, true);
2252
2253         pci_disable_device(pdev);
2254
2255         /* Request a slot reset. */
2256         return PCI_ERS_RESULT_NEED_RESET;
2257 }
2258
2259 /**
2260  * ixgb_io_slot_reset - called after the pci bus has been reset.
2261  * @pdev    pointer to pci device with error
2262  *
2263  * This callback is called after the PCI buss has been reset.
2264  * Basically, this tries to restart the card from scratch.
2265  * This is a shortened version of the device probe/discovery code,
2266  * it resembles the first-half of the ixgb_probe() routine.
2267  */
2268 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2269 {
2270         struct net_device *netdev = pci_get_drvdata(pdev);
2271         struct ixgb_adapter *adapter = netdev_priv(netdev);
2272
2273         if(pci_enable_device(pdev)) {
2274                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2275                 return PCI_ERS_RESULT_DISCONNECT;
2276         }
2277
2278         /* Perform card reset only on one instance of the card */
2279         if (0 != PCI_FUNC (pdev->devfn))
2280                 return PCI_ERS_RESULT_RECOVERED;
2281
2282         pci_set_master(pdev);
2283
2284         netif_carrier_off(netdev);
2285         netif_stop_queue(netdev);
2286         ixgb_reset(adapter);
2287
2288         /* Make sure the EEPROM is good */
2289         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2290                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2291                 return PCI_ERS_RESULT_DISCONNECT;
2292         }
2293         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2294         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2295
2296         if(!is_valid_ether_addr(netdev->perm_addr)) {
2297                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2298                 return PCI_ERS_RESULT_DISCONNECT;
2299         }
2300
2301         return PCI_ERS_RESULT_RECOVERED;
2302 }
2303
2304 /**
2305  * ixgb_io_resume - called when its OK to resume normal operations
2306  * @pdev    pointer to pci device with error
2307  *
2308  * The error recovery driver tells us that its OK to resume
2309  * normal operation. Implementation resembles the second-half
2310  * of the ixgb_probe() routine.
2311  */
2312 static void ixgb_io_resume (struct pci_dev *pdev)
2313 {
2314         struct net_device *netdev = pci_get_drvdata(pdev);
2315         struct ixgb_adapter *adapter = netdev_priv(netdev);
2316
2317         pci_set_master(pdev);
2318
2319         if(netif_running(netdev)) {
2320                 if(ixgb_up(adapter)) {
2321                         printk ("ixgb: can't bring device back up after reset\n");
2322                         return;
2323                 }
2324         }
2325
2326         netif_device_attach(netdev);
2327         mod_timer(&adapter->watchdog_timer, jiffies);
2328 }
2329
2330 /* ixgb_main.c */