b1cf8522d8fca82f81c57d42b6073c260bb3e5d1
[linux-2.6.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3   
4   Copyright(c) 1999 - 2006 Intel Corporation. All rights reserved.
5   
6   This program is free software; you can redistribute it and/or modify it 
7   under the terms of the GNU General Public License as published by the Free 
8   Software Foundation; either version 2 of the License, or (at your option) 
9   any later version.
10   
11   This program is distributed in the hope that it will be useful, but WITHOUT 
12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
14   more details.
15   
16   You should have received a copy of the GNU General Public License along with
17   this program; if not, write to the Free Software Foundation, Inc., 59 
18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19   
20   The full GNU General Public License is included in this distribution in the
21   file called LICENSE.
22   
23   Contact Information:
24   Linux NICS <linux.nics@intel.com>
25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #ifndef CONFIG_IXGB_NAPI
35 #define DRIVERNAPI
36 #else
37 #define DRIVERNAPI "-NAPI"
38 #endif
39 #define DRV_VERSION             "1.0.109-k4"DRIVERNAPI
40 char ixgb_driver_version[] = DRV_VERSION;
41 static char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
42
43 /* ixgb_pci_tbl - PCI Device ID Table
44  *
45  * Wildcard entries (PCI_ANY_ID) should come last
46  * Last entry must be all 0s
47  *
48  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
49  *   Class, Class Mask, private data (not used) }
50  */
51 static struct pci_device_id ixgb_pci_tbl[] = {
52         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
53          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,  
59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60
61         /* required last entry */
62         {0,}
63 };
64
65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
66
67 /* Local Function Prototypes */
68
69 int ixgb_up(struct ixgb_adapter *adapter);
70 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
71 void ixgb_reset(struct ixgb_adapter *adapter);
72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
76 void ixgb_update_stats(struct ixgb_adapter *adapter);
77
78 static int ixgb_init_module(void);
79 static void ixgb_exit_module(void);
80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
81 static void __devexit ixgb_remove(struct pci_dev *pdev);
82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
83 static int ixgb_open(struct net_device *netdev);
84 static int ixgb_close(struct net_device *netdev);
85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
90 static void ixgb_set_multi(struct net_device *netdev);
91 static void ixgb_watchdog(unsigned long data);
92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
95 static int ixgb_set_mac(struct net_device *netdev, void *p);
96 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
97 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
98
99 #ifdef CONFIG_IXGB_NAPI
100 static int ixgb_clean(struct net_device *netdev, int *budget);
101 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102                                    int *work_done, int work_to_do);
103 #else
104 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 void ixgb_set_ethtool_ops(struct net_device *netdev);
108 static void ixgb_tx_timeout(struct net_device *dev);
109 static void ixgb_tx_timeout_task(struct net_device *dev);
110 static void ixgb_vlan_rx_register(struct net_device *netdev,
111                                   struct vlan_group *grp);
112 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
113 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
114 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
115
116 #ifdef CONFIG_NET_POLL_CONTROLLER
117 /* for netdump / net console */
118 static void ixgb_netpoll(struct net_device *dev);
119 #endif
120
121 /* Exported from other modules */
122
123 extern void ixgb_check_options(struct ixgb_adapter *adapter);
124
125 static struct pci_driver ixgb_driver = {
126         .name     = ixgb_driver_name,
127         .id_table = ixgb_pci_tbl,
128         .probe    = ixgb_probe,
129         .remove   = __devexit_p(ixgb_remove),
130 };
131
132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
134 MODULE_LICENSE("GPL");
135 MODULE_VERSION(DRV_VERSION);
136
137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
139 module_param(debug, int, 0);
140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
141
142 /* some defines for controlling descriptor fetches in h/w */
143 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
144 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
145                                     * this */
146 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
147                                     * is pushed this many descriptors
148                                     * from head */
149
150 /**
151  * ixgb_init_module - Driver Registration Routine
152  *
153  * ixgb_init_module is the first routine called when the driver is
154  * loaded. All it does is register with the PCI subsystem.
155  **/
156
157 static int __init
158 ixgb_init_module(void)
159 {
160         printk(KERN_INFO "%s - version %s\n",
161                ixgb_driver_string, ixgb_driver_version);
162
163         printk(KERN_INFO "%s\n", ixgb_copyright);
164
165         return pci_module_init(&ixgb_driver);
166 }
167
168 module_init(ixgb_init_module);
169
170 /**
171  * ixgb_exit_module - Driver Exit Cleanup Routine
172  *
173  * ixgb_exit_module is called just before the driver is removed
174  * from memory.
175  **/
176
177 static void __exit
178 ixgb_exit_module(void)
179 {
180         pci_unregister_driver(&ixgb_driver);
181 }
182
183 module_exit(ixgb_exit_module);
184
185 /**
186  * ixgb_irq_disable - Mask off interrupt generation on the NIC
187  * @adapter: board private structure
188  **/
189
190 static void
191 ixgb_irq_disable(struct ixgb_adapter *adapter)
192 {
193         atomic_inc(&adapter->irq_sem);
194         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
195         IXGB_WRITE_FLUSH(&adapter->hw);
196         synchronize_irq(adapter->pdev->irq);
197 }
198
199 /**
200  * ixgb_irq_enable - Enable default interrupt generation settings
201  * @adapter: board private structure
202  **/
203
204 static void
205 ixgb_irq_enable(struct ixgb_adapter *adapter)
206 {
207         if(atomic_dec_and_test(&adapter->irq_sem)) {
208                 IXGB_WRITE_REG(&adapter->hw, IMS,
209                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
210                                IXGB_INT_LSC);
211                 IXGB_WRITE_FLUSH(&adapter->hw);
212         }
213 }
214
215 int
216 ixgb_up(struct ixgb_adapter *adapter)
217 {
218         struct net_device *netdev = adapter->netdev;
219         int err;
220         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
221         struct ixgb_hw *hw = &adapter->hw;
222
223         /* hardware has been reset, we need to reload some things */
224
225         ixgb_rar_set(hw, netdev->dev_addr, 0);
226         ixgb_set_multi(netdev);
227
228         ixgb_restore_vlan(adapter);
229
230         ixgb_configure_tx(adapter);
231         ixgb_setup_rctl(adapter);
232         ixgb_configure_rx(adapter);
233         ixgb_alloc_rx_buffers(adapter);
234
235         /* disable interrupts and get the hardware into a known state */
236         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
237
238 #ifdef CONFIG_PCI_MSI
239         {
240         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) & 
241                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
242         adapter->have_msi = TRUE;
243
244         if (!pcix)
245            adapter->have_msi = FALSE;
246         else if((err = pci_enable_msi(adapter->pdev))) {
247                 DPRINTK(PROBE, ERR,
248                  "Unable to allocate MSI interrupt Error: %d\n", err);
249                 adapter->have_msi = FALSE;
250                 /* proceed to try to request regular interrupt */
251         }
252         }
253
254 #endif
255         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
256                                   IRQF_SHARED | IRQF_SAMPLE_RANDOM,
257                                   netdev->name, netdev))) {
258                 DPRINTK(PROBE, ERR,
259                  "Unable to allocate interrupt Error: %d\n", err);
260                 return err;
261         }
262
263         if((hw->max_frame_size != max_frame) ||
264                 (hw->max_frame_size !=
265                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
266
267                 hw->max_frame_size = max_frame;
268
269                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
270
271                 if(hw->max_frame_size >
272                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
273                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
274
275                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
276                                 ctrl0 |= IXGB_CTRL0_JFE;
277                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
278                         }
279                 }
280         }
281
282         mod_timer(&adapter->watchdog_timer, jiffies);
283
284 #ifdef CONFIG_IXGB_NAPI
285         netif_poll_enable(netdev);
286 #endif
287         ixgb_irq_enable(adapter);
288
289         return 0;
290 }
291
292 void
293 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
294 {
295         struct net_device *netdev = adapter->netdev;
296
297         ixgb_irq_disable(adapter);
298         free_irq(adapter->pdev->irq, netdev);
299 #ifdef CONFIG_PCI_MSI
300         if(adapter->have_msi == TRUE)
301                 pci_disable_msi(adapter->pdev);
302
303 #endif
304         if(kill_watchdog)
305                 del_timer_sync(&adapter->watchdog_timer);
306 #ifdef CONFIG_IXGB_NAPI
307         netif_poll_disable(netdev);
308 #endif
309         adapter->link_speed = 0;
310         adapter->link_duplex = 0;
311         netif_carrier_off(netdev);
312         netif_stop_queue(netdev);
313
314         ixgb_reset(adapter);
315         ixgb_clean_tx_ring(adapter);
316         ixgb_clean_rx_ring(adapter);
317 }
318
319 void
320 ixgb_reset(struct ixgb_adapter *adapter)
321 {
322
323         ixgb_adapter_stop(&adapter->hw);
324         if(!ixgb_init_hw(&adapter->hw))
325                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
326 }
327
328 /**
329  * ixgb_probe - Device Initialization Routine
330  * @pdev: PCI device information struct
331  * @ent: entry in ixgb_pci_tbl
332  *
333  * Returns 0 on success, negative on failure
334  *
335  * ixgb_probe initializes an adapter identified by a pci_dev structure.
336  * The OS initialization, configuring of the adapter private structure,
337  * and a hardware reset occur.
338  **/
339
340 static int __devinit
341 ixgb_probe(struct pci_dev *pdev,
342                 const struct pci_device_id *ent)
343 {
344         struct net_device *netdev = NULL;
345         struct ixgb_adapter *adapter;
346         static int cards_found = 0;
347         unsigned long mmio_start;
348         int mmio_len;
349         int pci_using_dac;
350         int i;
351         int err;
352
353         if((err = pci_enable_device(pdev)))
354                 return err;
355
356         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
357            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
358                 pci_using_dac = 1;
359         } else {
360                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
361                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
362                         printk(KERN_ERR
363                          "ixgb: No usable DMA configuration, aborting\n");
364                         goto err_dma_mask;
365                 }
366                 pci_using_dac = 0;
367         }
368
369         if((err = pci_request_regions(pdev, ixgb_driver_name)))
370                 goto err_request_regions;
371
372         pci_set_master(pdev);
373
374         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
375         if(!netdev) {
376                 err = -ENOMEM;
377                 goto err_alloc_etherdev;
378         }
379
380         SET_MODULE_OWNER(netdev);
381         SET_NETDEV_DEV(netdev, &pdev->dev);
382
383         pci_set_drvdata(pdev, netdev);
384         adapter = netdev_priv(netdev);
385         adapter->netdev = netdev;
386         adapter->pdev = pdev;
387         adapter->hw.back = adapter;
388         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
389
390         mmio_start = pci_resource_start(pdev, BAR_0);
391         mmio_len = pci_resource_len(pdev, BAR_0);
392
393         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
394         if(!adapter->hw.hw_addr) {
395                 err = -EIO;
396                 goto err_ioremap;
397         }
398
399         for(i = BAR_1; i <= BAR_5; i++) {
400                 if(pci_resource_len(pdev, i) == 0)
401                         continue;
402                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
403                         adapter->hw.io_base = pci_resource_start(pdev, i);
404                         break;
405                 }
406         }
407
408         netdev->open = &ixgb_open;
409         netdev->stop = &ixgb_close;
410         netdev->hard_start_xmit = &ixgb_xmit_frame;
411         netdev->get_stats = &ixgb_get_stats;
412         netdev->set_multicast_list = &ixgb_set_multi;
413         netdev->set_mac_address = &ixgb_set_mac;
414         netdev->change_mtu = &ixgb_change_mtu;
415         ixgb_set_ethtool_ops(netdev);
416         netdev->tx_timeout = &ixgb_tx_timeout;
417         netdev->watchdog_timeo = 5 * HZ;
418 #ifdef CONFIG_IXGB_NAPI
419         netdev->poll = &ixgb_clean;
420         netdev->weight = 64;
421 #endif
422         netdev->vlan_rx_register = ixgb_vlan_rx_register;
423         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
424         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
425 #ifdef CONFIG_NET_POLL_CONTROLLER
426         netdev->poll_controller = ixgb_netpoll;
427 #endif
428
429         strcpy(netdev->name, pci_name(pdev));
430         netdev->mem_start = mmio_start;
431         netdev->mem_end = mmio_start + mmio_len;
432         netdev->base_addr = adapter->hw.io_base;
433
434         adapter->bd_number = cards_found;
435         adapter->link_speed = 0;
436         adapter->link_duplex = 0;
437
438         /* setup the private structure */
439
440         if((err = ixgb_sw_init(adapter)))
441                 goto err_sw_init;
442
443         netdev->features = NETIF_F_SG |
444                            NETIF_F_HW_CSUM |
445                            NETIF_F_HW_VLAN_TX |
446                            NETIF_F_HW_VLAN_RX |
447                            NETIF_F_HW_VLAN_FILTER;
448 #ifdef NETIF_F_TSO
449         netdev->features |= NETIF_F_TSO;
450 #endif
451 #ifdef NETIF_F_LLTX
452         netdev->features |= NETIF_F_LLTX;
453 #endif
454
455         if(pci_using_dac)
456                 netdev->features |= NETIF_F_HIGHDMA;
457
458         /* make sure the EEPROM is good */
459
460         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
461                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
462                 err = -EIO;
463                 goto err_eeprom;
464         }
465
466         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
467         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
468
469         if(!is_valid_ether_addr(netdev->perm_addr)) {
470                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
471                 err = -EIO;
472                 goto err_eeprom;
473         }
474
475         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
476
477         init_timer(&adapter->watchdog_timer);
478         adapter->watchdog_timer.function = &ixgb_watchdog;
479         adapter->watchdog_timer.data = (unsigned long)adapter;
480
481         INIT_WORK(&adapter->tx_timeout_task,
482                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
483
484         strcpy(netdev->name, "eth%d");
485         if((err = register_netdev(netdev)))
486                 goto err_register;
487
488         /* we're going to reset, so assume we have no link for now */
489
490         netif_carrier_off(netdev);
491         netif_stop_queue(netdev);
492
493         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
494         ixgb_check_options(adapter);
495         /* reset the hardware with the new settings */
496
497         ixgb_reset(adapter);
498
499         cards_found++;
500         return 0;
501
502 err_register:
503 err_sw_init:
504 err_eeprom:
505         iounmap(adapter->hw.hw_addr);
506 err_ioremap:
507         free_netdev(netdev);
508 err_alloc_etherdev:
509         pci_release_regions(pdev);
510 err_request_regions:
511 err_dma_mask:
512         pci_disable_device(pdev);
513         return err;
514 }
515
516 /**
517  * ixgb_remove - Device Removal Routine
518  * @pdev: PCI device information struct
519  *
520  * ixgb_remove is called by the PCI subsystem to alert the driver
521  * that it should release a PCI device.  The could be caused by a
522  * Hot-Plug event, or because the driver is going to be removed from
523  * memory.
524  **/
525
526 static void __devexit
527 ixgb_remove(struct pci_dev *pdev)
528 {
529         struct net_device *netdev = pci_get_drvdata(pdev);
530         struct ixgb_adapter *adapter = netdev_priv(netdev);
531
532         unregister_netdev(netdev);
533
534         iounmap(adapter->hw.hw_addr);
535         pci_release_regions(pdev);
536
537         free_netdev(netdev);
538 }
539
540 /**
541  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
542  * @adapter: board private structure to initialize
543  *
544  * ixgb_sw_init initializes the Adapter private data structure.
545  * Fields are initialized based on PCI device information and
546  * OS network device settings (MTU size).
547  **/
548
549 static int __devinit
550 ixgb_sw_init(struct ixgb_adapter *adapter)
551 {
552         struct ixgb_hw *hw = &adapter->hw;
553         struct net_device *netdev = adapter->netdev;
554         struct pci_dev *pdev = adapter->pdev;
555
556         /* PCI config space info */
557
558         hw->vendor_id = pdev->vendor;
559         hw->device_id = pdev->device;
560         hw->subsystem_vendor_id = pdev->subsystem_vendor;
561         hw->subsystem_id = pdev->subsystem_device;
562
563         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
564         adapter->rx_buffer_len = hw->max_frame_size;
565
566         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
567            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
568            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
569            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
570                         hw->mac_type = ixgb_82597;
571         else {
572                 /* should never have loaded on this device */
573                 DPRINTK(PROBE, ERR, "unsupported device id\n");
574         }
575
576         /* enable flow control to be programmed */
577         hw->fc.send_xon = 1;
578
579         atomic_set(&adapter->irq_sem, 1);
580         spin_lock_init(&adapter->tx_lock);
581
582         return 0;
583 }
584
585 /**
586  * ixgb_open - Called when a network interface is made active
587  * @netdev: network interface device structure
588  *
589  * Returns 0 on success, negative value on failure
590  *
591  * The open entry point is called when a network interface is made
592  * active by the system (IFF_UP).  At this point all resources needed
593  * for transmit and receive operations are allocated, the interrupt
594  * handler is registered with the OS, the watchdog timer is started,
595  * and the stack is notified that the interface is ready.
596  **/
597
598 static int
599 ixgb_open(struct net_device *netdev)
600 {
601         struct ixgb_adapter *adapter = netdev_priv(netdev);
602         int err;
603
604         /* allocate transmit descriptors */
605
606         if((err = ixgb_setup_tx_resources(adapter)))
607                 goto err_setup_tx;
608
609         /* allocate receive descriptors */
610
611         if((err = ixgb_setup_rx_resources(adapter)))
612                 goto err_setup_rx;
613
614         if((err = ixgb_up(adapter)))
615                 goto err_up;
616
617         return 0;
618
619 err_up:
620         ixgb_free_rx_resources(adapter);
621 err_setup_rx:
622         ixgb_free_tx_resources(adapter);
623 err_setup_tx:
624         ixgb_reset(adapter);
625
626         return err;
627 }
628
629 /**
630  * ixgb_close - Disables a network interface
631  * @netdev: network interface device structure
632  *
633  * Returns 0, this is not allowed to fail
634  *
635  * The close entry point is called when an interface is de-activated
636  * by the OS.  The hardware is still under the drivers control, but
637  * needs to be disabled.  A global MAC reset is issued to stop the
638  * hardware, and all transmit and receive resources are freed.
639  **/
640
641 static int
642 ixgb_close(struct net_device *netdev)
643 {
644         struct ixgb_adapter *adapter = netdev_priv(netdev);
645
646         ixgb_down(adapter, TRUE);
647
648         ixgb_free_tx_resources(adapter);
649         ixgb_free_rx_resources(adapter);
650
651         return 0;
652 }
653
654 /**
655  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
656  * @adapter: board private structure
657  *
658  * Return 0 on success, negative on failure
659  **/
660
661 int
662 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
663 {
664         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
665         struct pci_dev *pdev = adapter->pdev;
666         int size;
667
668         size = sizeof(struct ixgb_buffer) * txdr->count;
669         txdr->buffer_info = vmalloc(size);
670         if(!txdr->buffer_info) {
671                 DPRINTK(PROBE, ERR,
672                  "Unable to allocate transmit descriptor ring memory\n");
673                 return -ENOMEM;
674         }
675         memset(txdr->buffer_info, 0, size);
676
677         /* round up to nearest 4K */
678
679         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
680         IXGB_ROUNDUP(txdr->size, 4096);
681
682         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
683         if(!txdr->desc) {
684                 vfree(txdr->buffer_info);
685                 DPRINTK(PROBE, ERR,
686                  "Unable to allocate transmit descriptor memory\n");
687                 return -ENOMEM;
688         }
689         memset(txdr->desc, 0, txdr->size);
690
691         txdr->next_to_use = 0;
692         txdr->next_to_clean = 0;
693
694         return 0;
695 }
696
697 /**
698  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
699  * @adapter: board private structure
700  *
701  * Configure the Tx unit of the MAC after a reset.
702  **/
703
704 static void
705 ixgb_configure_tx(struct ixgb_adapter *adapter)
706 {
707         uint64_t tdba = adapter->tx_ring.dma;
708         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
709         uint32_t tctl;
710         struct ixgb_hw *hw = &adapter->hw;
711
712         /* Setup the Base and Length of the Tx Descriptor Ring 
713          * tx_ring.dma can be either a 32 or 64 bit value 
714          */
715
716         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
717         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
718
719         IXGB_WRITE_REG(hw, TDLEN, tdlen);
720
721         /* Setup the HW Tx Head and Tail descriptor pointers */
722
723         IXGB_WRITE_REG(hw, TDH, 0);
724         IXGB_WRITE_REG(hw, TDT, 0);
725
726         /* don't set up txdctl, it induces performance problems if configured
727          * incorrectly */
728         /* Set the Tx Interrupt Delay register */
729
730         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
731
732         /* Program the Transmit Control Register */
733
734         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
735         IXGB_WRITE_REG(hw, TCTL, tctl);
736
737         /* Setup Transmit Descriptor Settings for this adapter */
738         adapter->tx_cmd_type =
739                 IXGB_TX_DESC_TYPE 
740                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
741 }
742
743 /**
744  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
745  * @adapter: board private structure
746  *
747  * Returns 0 on success, negative on failure
748  **/
749
750 int
751 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
752 {
753         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
754         struct pci_dev *pdev = adapter->pdev;
755         int size;
756
757         size = sizeof(struct ixgb_buffer) * rxdr->count;
758         rxdr->buffer_info = vmalloc(size);
759         if(!rxdr->buffer_info) {
760                 DPRINTK(PROBE, ERR,
761                  "Unable to allocate receive descriptor ring\n");
762                 return -ENOMEM;
763         }
764         memset(rxdr->buffer_info, 0, size);
765
766         /* Round up to nearest 4K */
767
768         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
769         IXGB_ROUNDUP(rxdr->size, 4096);
770
771         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
772
773         if(!rxdr->desc) {
774                 vfree(rxdr->buffer_info);
775                 DPRINTK(PROBE, ERR,
776                  "Unable to allocate receive descriptors\n");
777                 return -ENOMEM;
778         }
779         memset(rxdr->desc, 0, rxdr->size);
780
781         rxdr->next_to_clean = 0;
782         rxdr->next_to_use = 0;
783
784         return 0;
785 }
786
787 /**
788  * ixgb_setup_rctl - configure the receive control register
789  * @adapter: Board private structure
790  **/
791
792 static void
793 ixgb_setup_rctl(struct ixgb_adapter *adapter)
794 {
795         uint32_t rctl;
796
797         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
798
799         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
800
801         rctl |=
802                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
803                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
804                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
805
806         rctl |= IXGB_RCTL_SECRC;
807
808         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
809                 rctl |= IXGB_RCTL_BSIZE_2048;
810         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
811                 rctl |= IXGB_RCTL_BSIZE_4096;
812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
813                 rctl |= IXGB_RCTL_BSIZE_8192;
814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
815                 rctl |= IXGB_RCTL_BSIZE_16384;
816
817         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
818 }
819
820 /**
821  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
822  * @adapter: board private structure
823  *
824  * Configure the Rx unit of the MAC after a reset.
825  **/
826
827 static void
828 ixgb_configure_rx(struct ixgb_adapter *adapter)
829 {
830         uint64_t rdba = adapter->rx_ring.dma;
831         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
832         struct ixgb_hw *hw = &adapter->hw;
833         uint32_t rctl;
834         uint32_t rxcsum;
835         uint32_t rxdctl;
836
837         /* make sure receives are disabled while setting up the descriptors */
838
839         rctl = IXGB_READ_REG(hw, RCTL);
840         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
841
842         /* set the Receive Delay Timer Register */
843
844         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
845
846         /* Setup the Base and Length of the Rx Descriptor Ring */
847
848         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
849         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
850
851         IXGB_WRITE_REG(hw, RDLEN, rdlen);
852
853         /* Setup the HW Rx Head and Tail Descriptor Pointers */
854         IXGB_WRITE_REG(hw, RDH, 0);
855         IXGB_WRITE_REG(hw, RDT, 0);
856
857         /* set up pre-fetching of receive buffers so we get some before we
858          * run out (default hardware behavior is to run out before fetching
859          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
860          * and the descriptors in hw cache are below PTHRESH.  This avoids
861          * the hardware behavior of fetching <=512 descriptors in a single
862          * burst that pre-empts all other activity, usually causing fifo
863          * overflows. */
864         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
865         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
866                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
867                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
868         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
869
870         /* Enable Receive Checksum Offload for TCP and UDP */
871         if(adapter->rx_csum == TRUE) {
872                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
873                 rxcsum |= IXGB_RXCSUM_TUOFL;
874                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
875         }
876
877         /* Enable Receives */
878
879         IXGB_WRITE_REG(hw, RCTL, rctl);
880 }
881
882 /**
883  * ixgb_free_tx_resources - Free Tx Resources
884  * @adapter: board private structure
885  *
886  * Free all transmit software resources
887  **/
888
889 void
890 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
891 {
892         struct pci_dev *pdev = adapter->pdev;
893
894         ixgb_clean_tx_ring(adapter);
895
896         vfree(adapter->tx_ring.buffer_info);
897         adapter->tx_ring.buffer_info = NULL;
898
899         pci_free_consistent(pdev, adapter->tx_ring.size,
900                             adapter->tx_ring.desc, adapter->tx_ring.dma);
901
902         adapter->tx_ring.desc = NULL;
903 }
904
905 static void
906 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
907                                         struct ixgb_buffer *buffer_info)
908 {
909         struct pci_dev *pdev = adapter->pdev;
910
911         if (buffer_info->dma)
912                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
913                                PCI_DMA_TODEVICE);
914
915         if (buffer_info->skb)
916                 dev_kfree_skb_any(buffer_info->skb);
917
918         buffer_info->skb = NULL;
919         buffer_info->dma = 0;
920         buffer_info->time_stamp = 0;
921         /* these fields must always be initialized in tx
922          * buffer_info->length = 0;
923          * buffer_info->next_to_watch = 0; */
924 }
925
926 /**
927  * ixgb_clean_tx_ring - Free Tx Buffers
928  * @adapter: board private structure
929  **/
930
931 static void
932 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
933 {
934         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
935         struct ixgb_buffer *buffer_info;
936         unsigned long size;
937         unsigned int i;
938
939         /* Free all the Tx ring sk_buffs */
940
941         for(i = 0; i < tx_ring->count; i++) {
942                 buffer_info = &tx_ring->buffer_info[i];
943                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
944         }
945
946         size = sizeof(struct ixgb_buffer) * tx_ring->count;
947         memset(tx_ring->buffer_info, 0, size);
948
949         /* Zero out the descriptor ring */
950
951         memset(tx_ring->desc, 0, tx_ring->size);
952
953         tx_ring->next_to_use = 0;
954         tx_ring->next_to_clean = 0;
955
956         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
957         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
958 }
959
960 /**
961  * ixgb_free_rx_resources - Free Rx Resources
962  * @adapter: board private structure
963  *
964  * Free all receive software resources
965  **/
966
967 void
968 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
969 {
970         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
971         struct pci_dev *pdev = adapter->pdev;
972
973         ixgb_clean_rx_ring(adapter);
974
975         vfree(rx_ring->buffer_info);
976         rx_ring->buffer_info = NULL;
977
978         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
979
980         rx_ring->desc = NULL;
981 }
982
983 /**
984  * ixgb_clean_rx_ring - Free Rx Buffers
985  * @adapter: board private structure
986  **/
987
988 static void
989 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
990 {
991         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
992         struct ixgb_buffer *buffer_info;
993         struct pci_dev *pdev = adapter->pdev;
994         unsigned long size;
995         unsigned int i;
996
997         /* Free all the Rx ring sk_buffs */
998
999         for(i = 0; i < rx_ring->count; i++) {
1000                 buffer_info = &rx_ring->buffer_info[i];
1001                 if(buffer_info->skb) {
1002
1003                         pci_unmap_single(pdev,
1004                                          buffer_info->dma,
1005                                          buffer_info->length,
1006                                          PCI_DMA_FROMDEVICE);
1007
1008                         dev_kfree_skb(buffer_info->skb);
1009
1010                         buffer_info->skb = NULL;
1011                 }
1012         }
1013
1014         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1015         memset(rx_ring->buffer_info, 0, size);
1016
1017         /* Zero out the descriptor ring */
1018
1019         memset(rx_ring->desc, 0, rx_ring->size);
1020
1021         rx_ring->next_to_clean = 0;
1022         rx_ring->next_to_use = 0;
1023
1024         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1025         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1026 }
1027
1028 /**
1029  * ixgb_set_mac - Change the Ethernet Address of the NIC
1030  * @netdev: network interface device structure
1031  * @p: pointer to an address structure
1032  *
1033  * Returns 0 on success, negative on failure
1034  **/
1035
1036 static int
1037 ixgb_set_mac(struct net_device *netdev, void *p)
1038 {
1039         struct ixgb_adapter *adapter = netdev_priv(netdev);
1040         struct sockaddr *addr = p;
1041
1042         if(!is_valid_ether_addr(addr->sa_data))
1043                 return -EADDRNOTAVAIL;
1044
1045         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1046
1047         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * ixgb_set_multi - Multicast and Promiscuous mode set
1054  * @netdev: network interface device structure
1055  *
1056  * The set_multi entry point is called whenever the multicast address
1057  * list or the network interface flags are updated.  This routine is
1058  * responsible for configuring the hardware for proper multicast,
1059  * promiscuous mode, and all-multi behavior.
1060  **/
1061
1062 static void
1063 ixgb_set_multi(struct net_device *netdev)
1064 {
1065         struct ixgb_adapter *adapter = netdev_priv(netdev);
1066         struct ixgb_hw *hw = &adapter->hw;
1067         struct dev_mc_list *mc_ptr;
1068         uint32_t rctl;
1069         int i;
1070
1071         /* Check for Promiscuous and All Multicast modes */
1072
1073         rctl = IXGB_READ_REG(hw, RCTL);
1074
1075         if(netdev->flags & IFF_PROMISC) {
1076                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077         } else if(netdev->flags & IFF_ALLMULTI) {
1078                 rctl |= IXGB_RCTL_MPE;
1079                 rctl &= ~IXGB_RCTL_UPE;
1080         } else {
1081                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1082         }
1083
1084         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1085                 rctl |= IXGB_RCTL_MPE;
1086                 IXGB_WRITE_REG(hw, RCTL, rctl);
1087         } else {
1088                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1089
1090                 IXGB_WRITE_REG(hw, RCTL, rctl);
1091
1092                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1093                         i++, mc_ptr = mc_ptr->next)
1094                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1095                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1096
1097                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1098         }
1099 }
1100
1101 /**
1102  * ixgb_watchdog - Timer Call-back
1103  * @data: pointer to netdev cast into an unsigned long
1104  **/
1105
1106 static void
1107 ixgb_watchdog(unsigned long data)
1108 {
1109         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1110         struct net_device *netdev = adapter->netdev;
1111         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1112
1113         ixgb_check_for_link(&adapter->hw);
1114
1115         if (ixgb_check_for_bad_link(&adapter->hw)) {
1116                 /* force the reset path */
1117                 netif_stop_queue(netdev);
1118         }
1119
1120         if(adapter->hw.link_up) {
1121                 if(!netif_carrier_ok(netdev)) {
1122                         DPRINTK(LINK, INFO,
1123                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1124                         adapter->link_speed = 10000;
1125                         adapter->link_duplex = FULL_DUPLEX;
1126                         netif_carrier_on(netdev);
1127                         netif_wake_queue(netdev);
1128                 }
1129         } else {
1130                 if(netif_carrier_ok(netdev)) {
1131                         adapter->link_speed = 0;
1132                         adapter->link_duplex = 0;
1133                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1134                         netif_carrier_off(netdev);
1135                         netif_stop_queue(netdev);
1136
1137                 }
1138         }
1139
1140         ixgb_update_stats(adapter);
1141
1142         if(!netif_carrier_ok(netdev)) {
1143                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1144                         /* We've lost link, so the controller stops DMA,
1145                          * but we've got queued Tx work that's never going
1146                          * to get done, so reset controller to flush Tx.
1147                          * (Do the reset outside of interrupt context). */
1148                         schedule_work(&adapter->tx_timeout_task);
1149                 }
1150         }
1151
1152         /* Force detection of hung controller every watchdog period */
1153         adapter->detect_tx_hung = TRUE;
1154
1155         /* generate an interrupt to force clean up of any stragglers */
1156         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1157
1158         /* Reset the timer */
1159         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1160 }
1161
1162 #define IXGB_TX_FLAGS_CSUM              0x00000001
1163 #define IXGB_TX_FLAGS_VLAN              0x00000002
1164 #define IXGB_TX_FLAGS_TSO               0x00000004
1165
1166 static int
1167 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1168 {
1169 #ifdef NETIF_F_TSO
1170         struct ixgb_context_desc *context_desc;
1171         unsigned int i;
1172         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1173         uint16_t ipcse, tucse, mss;
1174         int err;
1175
1176         if (likely(skb_is_gso(skb))) {
1177                 if (skb_header_cloned(skb)) {
1178                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1179                         if (err)
1180                                 return err;
1181                 }
1182
1183                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1184                 mss = skb_shinfo(skb)->gso_size;
1185                 skb->nh.iph->tot_len = 0;
1186                 skb->nh.iph->check = 0;
1187                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1188                                                       skb->nh.iph->daddr,
1189                                                       0, IPPROTO_TCP, 0);
1190                 ipcss = skb->nh.raw - skb->data;
1191                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1192                 ipcse = skb->h.raw - skb->data - 1;
1193                 tucss = skb->h.raw - skb->data;
1194                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1195                 tucse = 0;
1196
1197                 i = adapter->tx_ring.next_to_use;
1198                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1199
1200                 context_desc->ipcss = ipcss;
1201                 context_desc->ipcso = ipcso;
1202                 context_desc->ipcse = cpu_to_le16(ipcse);
1203                 context_desc->tucss = tucss;
1204                 context_desc->tucso = tucso;
1205                 context_desc->tucse = cpu_to_le16(tucse);
1206                 context_desc->mss = cpu_to_le16(mss);
1207                 context_desc->hdr_len = hdr_len;
1208                 context_desc->status = 0;
1209                 context_desc->cmd_type_len = cpu_to_le32(
1210                                                   IXGB_CONTEXT_DESC_TYPE 
1211                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1212                                                 | IXGB_CONTEXT_DESC_CMD_IP
1213                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1214                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1215                                                 | (skb->len - (hdr_len)));
1216
1217
1218                 if(++i == adapter->tx_ring.count) i = 0;
1219                 adapter->tx_ring.next_to_use = i;
1220
1221                 return 1;
1222         }
1223 #endif
1224
1225         return 0;
1226 }
1227
1228 static boolean_t
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         uint8_t css, cso;
1234
1235         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1236                 css = skb->h.raw - skb->data;
1237                 cso = (skb->h.raw + skb->csum) - skb->data;
1238
1239                 i = adapter->tx_ring.next_to_use;
1240                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241
1242                 context_desc->tucss = css;
1243                 context_desc->tucso = cso;
1244                 context_desc->tucse = 0;
1245                 /* zero out any previously existing data in one instruction */
1246                 *(uint32_t *)&(context_desc->ipcss) = 0;
1247                 context_desc->status = 0;
1248                 context_desc->hdr_len = 0;
1249                 context_desc->mss = 0;
1250                 context_desc->cmd_type_len =
1251                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252                                     | IXGB_TX_DESC_CMD_IDE);
1253
1254                 if(++i == adapter->tx_ring.count) i = 0;
1255                 adapter->tx_ring.next_to_use = i;
1256
1257                 return TRUE;
1258         }
1259
1260         return FALSE;
1261 }
1262
1263 #define IXGB_MAX_TXD_PWR        14
1264 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1265
1266 static int
1267 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1268             unsigned int first)
1269 {
1270         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1271         struct ixgb_buffer *buffer_info;
1272         int len = skb->len;
1273         unsigned int offset = 0, size, count = 0, i;
1274
1275         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1276         unsigned int f;
1277
1278         len -= skb->data_len;
1279
1280         i = tx_ring->next_to_use;
1281
1282         while(len) {
1283                 buffer_info = &tx_ring->buffer_info[i];
1284                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1285                 buffer_info->length = size;
1286                 buffer_info->dma =
1287                         pci_map_single(adapter->pdev,
1288                                 skb->data + offset,
1289                                 size,
1290                                 PCI_DMA_TODEVICE);
1291                 buffer_info->time_stamp = jiffies;
1292                 buffer_info->next_to_watch = 0;
1293
1294                 len -= size;
1295                 offset += size;
1296                 count++;
1297                 if(++i == tx_ring->count) i = 0;
1298         }
1299
1300         for(f = 0; f < nr_frags; f++) {
1301                 struct skb_frag_struct *frag;
1302
1303                 frag = &skb_shinfo(skb)->frags[f];
1304                 len = frag->size;
1305                 offset = 0;
1306
1307                 while(len) {
1308                         buffer_info = &tx_ring->buffer_info[i];
1309                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1310                         buffer_info->length = size;
1311                         buffer_info->dma =
1312                                 pci_map_page(adapter->pdev,
1313                                         frag->page,
1314                                         frag->page_offset + offset,
1315                                         size,
1316                                         PCI_DMA_TODEVICE);
1317                         buffer_info->time_stamp = jiffies;
1318                         buffer_info->next_to_watch = 0;
1319
1320                         len -= size;
1321                         offset += size;
1322                         count++;
1323                         if(++i == tx_ring->count) i = 0;
1324                 }
1325         }
1326         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1327         tx_ring->buffer_info[i].skb = skb;
1328         tx_ring->buffer_info[first].next_to_watch = i;
1329
1330         return count;
1331 }
1332
1333 static void
1334 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1335 {
1336         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1337         struct ixgb_tx_desc *tx_desc = NULL;
1338         struct ixgb_buffer *buffer_info;
1339         uint32_t cmd_type_len = adapter->tx_cmd_type;
1340         uint8_t status = 0;
1341         uint8_t popts = 0;
1342         unsigned int i;
1343
1344         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1345                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1346                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1347         }
1348
1349         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1350                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1351
1352         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1353                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1354         }
1355
1356         i = tx_ring->next_to_use;
1357
1358         while(count--) {
1359                 buffer_info = &tx_ring->buffer_info[i];
1360                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1361                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1362                 tx_desc->cmd_type_len =
1363                         cpu_to_le32(cmd_type_len | buffer_info->length);
1364                 tx_desc->status = status;
1365                 tx_desc->popts = popts;
1366                 tx_desc->vlan = cpu_to_le16(vlan_id);
1367
1368                 if(++i == tx_ring->count) i = 0;
1369         }
1370
1371         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
1372                                 | IXGB_TX_DESC_CMD_RS );
1373
1374         /* Force memory writes to complete before letting h/w
1375          * know there are new descriptors to fetch.  (Only
1376          * applicable for weak-ordered memory model archs,
1377          * such as IA-64). */
1378         wmb();
1379
1380         tx_ring->next_to_use = i;
1381         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1382 }
1383
1384 /* Tx Descriptors needed, worst case */
1385 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1386                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1387 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1388         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1389
1390 static int
1391 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1392 {
1393         struct ixgb_adapter *adapter = netdev_priv(netdev);
1394         unsigned int first;
1395         unsigned int tx_flags = 0;
1396         unsigned long flags;
1397         int vlan_id = 0;
1398         int tso;
1399
1400         if(skb->len <= 0) {
1401                 dev_kfree_skb_any(skb);
1402                 return 0;
1403         }
1404
1405 #ifdef NETIF_F_LLTX
1406         local_irq_save(flags);
1407         if (!spin_trylock(&adapter->tx_lock)) {
1408                 /* Collision - tell upper layer to requeue */
1409                 local_irq_restore(flags);
1410                 return NETDEV_TX_LOCKED;
1411         }
1412 #else
1413         spin_lock_irqsave(&adapter->tx_lock, flags);
1414 #endif
1415
1416         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1417                 netif_stop_queue(netdev);
1418                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1419                 return NETDEV_TX_BUSY;
1420         }
1421
1422 #ifndef NETIF_F_LLTX
1423         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1424 #endif
1425
1426         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1427                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1428                 vlan_id = vlan_tx_tag_get(skb);
1429         }
1430
1431         first = adapter->tx_ring.next_to_use;
1432         
1433         tso = ixgb_tso(adapter, skb);
1434         if (tso < 0) {
1435                 dev_kfree_skb_any(skb);
1436 #ifdef NETIF_F_LLTX
1437                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1438 #endif
1439                 return NETDEV_TX_OK;
1440         }
1441
1442         if (likely(tso))
1443                 tx_flags |= IXGB_TX_FLAGS_TSO;
1444         else if(ixgb_tx_csum(adapter, skb))
1445                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1446
1447         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1448                         tx_flags);
1449
1450         netdev->trans_start = jiffies;
1451
1452 #ifdef NETIF_F_LLTX
1453         /* Make sure there is space in the ring for the next send. */
1454         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1455                 netif_stop_queue(netdev);
1456
1457         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1458
1459 #endif
1460         return NETDEV_TX_OK;
1461 }
1462
1463 /**
1464  * ixgb_tx_timeout - Respond to a Tx Hang
1465  * @netdev: network interface device structure
1466  **/
1467
1468 static void
1469 ixgb_tx_timeout(struct net_device *netdev)
1470 {
1471         struct ixgb_adapter *adapter = netdev_priv(netdev);
1472
1473         /* Do the reset outside of interrupt context */
1474         schedule_work(&adapter->tx_timeout_task);
1475 }
1476
1477 static void
1478 ixgb_tx_timeout_task(struct net_device *netdev)
1479 {
1480         struct ixgb_adapter *adapter = netdev_priv(netdev);
1481
1482         adapter->tx_timeout_count++;
1483         ixgb_down(adapter, TRUE);
1484         ixgb_up(adapter);
1485 }
1486
1487 /**
1488  * ixgb_get_stats - Get System Network Statistics
1489  * @netdev: network interface device structure
1490  *
1491  * Returns the address of the device statistics structure.
1492  * The statistics are actually updated from the timer callback.
1493  **/
1494
1495 static struct net_device_stats *
1496 ixgb_get_stats(struct net_device *netdev)
1497 {
1498         struct ixgb_adapter *adapter = netdev_priv(netdev);
1499
1500         return &adapter->net_stats;
1501 }
1502
1503 /**
1504  * ixgb_change_mtu - Change the Maximum Transfer Unit
1505  * @netdev: network interface device structure
1506  * @new_mtu: new value for maximum frame size
1507  *
1508  * Returns 0 on success, negative on failure
1509  **/
1510
1511 static int
1512 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1513 {
1514         struct ixgb_adapter *adapter = netdev_priv(netdev);
1515         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1516         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1517
1518
1519         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1520            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1521                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1522                 return -EINVAL;
1523         }
1524
1525         adapter->rx_buffer_len = max_frame;
1526
1527         netdev->mtu = new_mtu;
1528
1529         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1530                 ixgb_down(adapter, TRUE);
1531                 ixgb_up(adapter);
1532         }
1533
1534         return 0;
1535 }
1536
1537 /**
1538  * ixgb_update_stats - Update the board statistics counters.
1539  * @adapter: board private structure
1540  **/
1541
1542 void
1543 ixgb_update_stats(struct ixgb_adapter *adapter)
1544 {
1545         struct net_device *netdev = adapter->netdev;
1546
1547         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1548            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1549                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1550                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1551                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1552                 u64 bcast = ((u64)bcast_h << 32) | bcast_l; 
1553
1554                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1555                 /* fix up multicast stats by removing broadcasts */
1556                 if(multi >= bcast)
1557                         multi -= bcast;
1558                 
1559                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1560                 adapter->stats.mprch += (multi >> 32);
1561                 adapter->stats.bprcl += bcast_l; 
1562                 adapter->stats.bprch += bcast_h;
1563         } else {
1564                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1565                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1566                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1567                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1568         }
1569         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1570         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1571         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1572         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1573         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1574         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1575         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1576         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1577         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1578         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1579         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1580         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1581         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1582         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1583         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1584         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1585         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1586         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1587         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1588         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1589         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1590         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1591         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1592         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1593         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1594         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1595         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1596         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1597         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1598         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1599         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1600         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1601         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1602         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1603         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1604         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1605         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1606         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1607         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1608         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1609         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1610         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1611         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1612         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1613         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1614         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1615         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1616         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1617         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1618         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1619         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1620         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1621         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1622         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1623         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1624         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1625
1626         /* Fill out the OS statistics structure */
1627
1628         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1629         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1630         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1631         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1632         adapter->net_stats.multicast = adapter->stats.mprcl;
1633         adapter->net_stats.collisions = 0;
1634
1635         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1636          * with a length in the type/len field */
1637         adapter->net_stats.rx_errors =
1638             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1639             adapter->stats.ruc +
1640             adapter->stats.roc /*+ adapter->stats.rlec */  +
1641             adapter->stats.icbc +
1642             adapter->stats.ecbc + adapter->stats.mpc;
1643
1644         /* see above
1645          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1646          */
1647
1648         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1649         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1650         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1651         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1652
1653         adapter->net_stats.tx_errors = 0;
1654         adapter->net_stats.rx_frame_errors = 0;
1655         adapter->net_stats.tx_aborted_errors = 0;
1656         adapter->net_stats.tx_carrier_errors = 0;
1657         adapter->net_stats.tx_fifo_errors = 0;
1658         adapter->net_stats.tx_heartbeat_errors = 0;
1659         adapter->net_stats.tx_window_errors = 0;
1660 }
1661
1662 #define IXGB_MAX_INTR 10
1663 /**
1664  * ixgb_intr - Interrupt Handler
1665  * @irq: interrupt number
1666  * @data: pointer to a network interface device structure
1667  * @pt_regs: CPU registers structure
1668  **/
1669
1670 static irqreturn_t
1671 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1672 {
1673         struct net_device *netdev = data;
1674         struct ixgb_adapter *adapter = netdev_priv(netdev);
1675         struct ixgb_hw *hw = &adapter->hw;
1676         uint32_t icr = IXGB_READ_REG(hw, ICR);
1677 #ifndef CONFIG_IXGB_NAPI
1678         unsigned int i;
1679 #endif
1680
1681         if(unlikely(!icr))
1682                 return IRQ_NONE;  /* Not our interrupt */
1683
1684         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1685                 mod_timer(&adapter->watchdog_timer, jiffies);
1686         }
1687
1688 #ifdef CONFIG_IXGB_NAPI
1689         if(netif_rx_schedule_prep(netdev)) {
1690
1691                 /* Disable interrupts and register for poll. The flush 
1692                   of the posted write is intentionally left out.
1693                 */
1694
1695                 atomic_inc(&adapter->irq_sem);
1696                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1697                 __netif_rx_schedule(netdev);
1698         }
1699 #else
1700         /* yes, that is actually a & and it is meant to make sure that
1701          * every pass through this for loop checks both receive and
1702          * transmit queues for completed descriptors, intended to
1703          * avoid starvation issues and assist tx/rx fairness. */
1704         for(i = 0; i < IXGB_MAX_INTR; i++)
1705                 if(!ixgb_clean_rx_irq(adapter) &
1706                    !ixgb_clean_tx_irq(adapter))
1707                         break;
1708 #endif 
1709         return IRQ_HANDLED;
1710 }
1711
1712 #ifdef CONFIG_IXGB_NAPI
1713 /**
1714  * ixgb_clean - NAPI Rx polling callback
1715  * @adapter: board private structure
1716  **/
1717
1718 static int
1719 ixgb_clean(struct net_device *netdev, int *budget)
1720 {
1721         struct ixgb_adapter *adapter = netdev_priv(netdev);
1722         int work_to_do = min(*budget, netdev->quota);
1723         int tx_cleaned;
1724         int work_done = 0;
1725
1726         tx_cleaned = ixgb_clean_tx_irq(adapter);
1727         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1728
1729         *budget -= work_done;
1730         netdev->quota -= work_done;
1731
1732         /* if no Tx and not enough Rx work done, exit the polling mode */
1733         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1734                 netif_rx_complete(netdev);
1735                 ixgb_irq_enable(adapter);
1736                 return 0;
1737         }
1738
1739         return 1;
1740 }
1741 #endif
1742
1743 /**
1744  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1745  * @adapter: board private structure
1746  **/
1747
1748 static boolean_t
1749 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1750 {
1751         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1752         struct net_device *netdev = adapter->netdev;
1753         struct ixgb_tx_desc *tx_desc, *eop_desc;
1754         struct ixgb_buffer *buffer_info;
1755         unsigned int i, eop;
1756         boolean_t cleaned = FALSE;
1757
1758         i = tx_ring->next_to_clean;
1759         eop = tx_ring->buffer_info[i].next_to_watch;
1760         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1761
1762         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1763
1764                 for(cleaned = FALSE; !cleaned; ) {
1765                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1766                         buffer_info = &tx_ring->buffer_info[i];
1767
1768                         if (tx_desc->popts
1769                             & (IXGB_TX_DESC_POPTS_TXSM |
1770                                IXGB_TX_DESC_POPTS_IXSM))
1771                                 adapter->hw_csum_tx_good++;
1772
1773                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1774
1775                         *(uint32_t *)&(tx_desc->status) = 0;
1776
1777                         cleaned = (i == eop);
1778                         if(++i == tx_ring->count) i = 0;
1779                 }
1780
1781                 eop = tx_ring->buffer_info[i].next_to_watch;
1782                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1783         }
1784
1785         tx_ring->next_to_clean = i;
1786
1787         if (unlikely(netif_queue_stopped(netdev))) {
1788                 spin_lock(&adapter->tx_lock);
1789                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1790                     (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE))
1791                         netif_wake_queue(netdev);
1792                 spin_unlock(&adapter->tx_lock);
1793         }
1794
1795         if(adapter->detect_tx_hung) {
1796                 /* detect a transmit hang in hardware, this serializes the
1797                  * check with the clearing of time_stamp and movement of i */
1798                 adapter->detect_tx_hung = FALSE;
1799                 if (tx_ring->buffer_info[eop].dma &&
1800                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1801                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1802                         IXGB_STATUS_TXOFF)) {
1803                         /* detected Tx unit hang */
1804                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1805                                         "  TDH                  <%x>\n"
1806                                         "  TDT                  <%x>\n"
1807                                         "  next_to_use          <%x>\n"
1808                                         "  next_to_clean        <%x>\n"
1809                                         "buffer_info[next_to_clean]\n"
1810                                         "  time_stamp           <%lx>\n"
1811                                         "  next_to_watch        <%x>\n"
1812                                         "  jiffies              <%lx>\n"
1813                                         "  next_to_watch.status <%x>\n",
1814                                 IXGB_READ_REG(&adapter->hw, TDH),
1815                                 IXGB_READ_REG(&adapter->hw, TDT),
1816                                 tx_ring->next_to_use,
1817                                 tx_ring->next_to_clean,
1818                                 tx_ring->buffer_info[eop].time_stamp,
1819                                 eop,
1820                                 jiffies,
1821                                 eop_desc->status);
1822                         netif_stop_queue(netdev);
1823                 }
1824         }
1825
1826         return cleaned;
1827 }
1828
1829 /**
1830  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1831  * @adapter: board private structure
1832  * @rx_desc: receive descriptor
1833  * @sk_buff: socket buffer with received data
1834  **/
1835
1836 static void
1837 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1838                  struct ixgb_rx_desc *rx_desc,
1839                  struct sk_buff *skb)
1840 {
1841         /* Ignore Checksum bit is set OR
1842          * TCP Checksum has not been calculated
1843          */
1844         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1845            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1846                 skb->ip_summed = CHECKSUM_NONE;
1847                 return;
1848         }
1849
1850         /* At this point we know the hardware did the TCP checksum */
1851         /* now look at the TCP checksum error bit */
1852         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1853                 /* let the stack verify checksum errors */
1854                 skb->ip_summed = CHECKSUM_NONE;
1855                 adapter->hw_csum_rx_error++;
1856         } else {
1857                 /* TCP checksum is good */
1858                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1859                 adapter->hw_csum_rx_good++;
1860         }
1861 }
1862
1863 /**
1864  * ixgb_clean_rx_irq - Send received data up the network stack,
1865  * @adapter: board private structure
1866  **/
1867
1868 static boolean_t
1869 #ifdef CONFIG_IXGB_NAPI
1870 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1871 #else
1872 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1873 #endif
1874 {
1875         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1876         struct net_device *netdev = adapter->netdev;
1877         struct pci_dev *pdev = adapter->pdev;
1878         struct ixgb_rx_desc *rx_desc, *next_rxd;
1879         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1880         uint32_t length;
1881         unsigned int i, j;
1882         boolean_t cleaned = FALSE;
1883
1884         i = rx_ring->next_to_clean;
1885         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1886         buffer_info = &rx_ring->buffer_info[i];
1887
1888         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1889                 struct sk_buff *skb, *next_skb;
1890                 u8 status;
1891
1892 #ifdef CONFIG_IXGB_NAPI
1893                 if(*work_done >= work_to_do)
1894                         break;
1895
1896                 (*work_done)++;
1897 #endif
1898                 status = rx_desc->status;
1899                 skb = buffer_info->skb;
1900                 buffer_info->skb = NULL;
1901
1902                 prefetch(skb->data);
1903
1904                 if(++i == rx_ring->count) i = 0;
1905                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1906                 prefetch(next_rxd);
1907
1908                 if((j = i + 1) == rx_ring->count) j = 0;
1909                 next2_buffer = &rx_ring->buffer_info[j];
1910                 prefetch(next2_buffer);
1911
1912                 next_buffer = &rx_ring->buffer_info[i];
1913                 next_skb = next_buffer->skb;
1914                 prefetch(next_skb);
1915
1916                 cleaned = TRUE;
1917
1918                 pci_unmap_single(pdev,
1919                                  buffer_info->dma,
1920                                  buffer_info->length,
1921                                  PCI_DMA_FROMDEVICE);
1922
1923                 length = le16_to_cpu(rx_desc->length);
1924
1925                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1926
1927                         /* All receives must fit into a single buffer */
1928
1929                         IXGB_DBG("Receive packet consumed multiple buffers "
1930                                          "length<%x>\n", length);
1931
1932                         dev_kfree_skb_irq(skb);
1933                         goto rxdesc_done;
1934                 }
1935
1936                 if (unlikely(rx_desc->errors
1937                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1938                                 | IXGB_RX_DESC_ERRORS_P |
1939                                 IXGB_RX_DESC_ERRORS_RXE))) {
1940
1941                         dev_kfree_skb_irq(skb);
1942                         goto rxdesc_done;
1943                 }
1944
1945                 /* code added for copybreak, this should improve
1946                  * performance for small packets with large amounts
1947                  * of reassembly being done in the stack */
1948 #define IXGB_CB_LENGTH 256
1949                 if (length < IXGB_CB_LENGTH) {
1950                         struct sk_buff *new_skb =
1951                             dev_alloc_skb(length + NET_IP_ALIGN);
1952                         if (new_skb) {
1953                                 skb_reserve(new_skb, NET_IP_ALIGN);
1954                                 new_skb->dev = netdev;
1955                                 memcpy(new_skb->data - NET_IP_ALIGN,
1956                                        skb->data - NET_IP_ALIGN,
1957                                        length + NET_IP_ALIGN);
1958                                 /* save the skb in buffer_info as good */
1959                                 buffer_info->skb = skb;
1960                                 skb = new_skb;
1961                         }
1962                 }
1963                 /* end copybreak code */
1964
1965                 /* Good Receive */
1966                 skb_put(skb, length);
1967
1968                 /* Receive Checksum Offload */
1969                 ixgb_rx_checksum(adapter, rx_desc, skb);
1970
1971                 skb->protocol = eth_type_trans(skb, netdev);
1972 #ifdef CONFIG_IXGB_NAPI
1973                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1974                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1975                                 le16_to_cpu(rx_desc->special) &
1976                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1977                 } else {
1978                         netif_receive_skb(skb);
1979                 }
1980 #else /* CONFIG_IXGB_NAPI */
1981                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1982                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1983                                 le16_to_cpu(rx_desc->special) &
1984                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1985                 } else {
1986                         netif_rx(skb);
1987                 }
1988 #endif /* CONFIG_IXGB_NAPI */
1989                 netdev->last_rx = jiffies;
1990
1991 rxdesc_done:
1992                 /* clean up descriptor, might be written over by hw */
1993                 rx_desc->status = 0;
1994
1995                 /* use prefetched values */
1996                 rx_desc = next_rxd;
1997                 buffer_info = next_buffer;
1998         }
1999
2000         rx_ring->next_to_clean = i;
2001
2002         ixgb_alloc_rx_buffers(adapter);
2003
2004         return cleaned;
2005 }
2006
2007 /**
2008  * ixgb_alloc_rx_buffers - Replace used receive buffers
2009  * @adapter: address of board private structure
2010  **/
2011
2012 static void
2013 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2014 {
2015         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2016         struct net_device *netdev = adapter->netdev;
2017         struct pci_dev *pdev = adapter->pdev;
2018         struct ixgb_rx_desc *rx_desc;
2019         struct ixgb_buffer *buffer_info;
2020         struct sk_buff *skb;
2021         unsigned int i;
2022         int num_group_tail_writes;
2023         long cleancount;
2024
2025         i = rx_ring->next_to_use;
2026         buffer_info = &rx_ring->buffer_info[i];
2027         cleancount = IXGB_DESC_UNUSED(rx_ring);
2028
2029         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2030
2031         /* leave three descriptors unused */
2032         while(--cleancount > 2) {
2033                 /* recycle! its good for you */
2034                 if (!(skb = buffer_info->skb))
2035                         skb = dev_alloc_skb(adapter->rx_buffer_len
2036                                             + NET_IP_ALIGN);
2037                 else {
2038                         skb_trim(skb, 0);
2039                         goto map_skb;
2040                 }
2041
2042                 if (unlikely(!skb)) {
2043                         /* Better luck next round */
2044                         adapter->alloc_rx_buff_failed++;
2045                         break;
2046                 }
2047
2048                 /* Make buffer alignment 2 beyond a 16 byte boundary
2049                  * this will result in a 16 byte aligned IP header after
2050                  * the 14 byte MAC header is removed
2051                  */
2052                 skb_reserve(skb, NET_IP_ALIGN);
2053
2054                 skb->dev = netdev;
2055
2056                 buffer_info->skb = skb;
2057                 buffer_info->length = adapter->rx_buffer_len;
2058 map_skb:
2059                 buffer_info->dma = pci_map_single(pdev,
2060                                                   skb->data,
2061                                                   adapter->rx_buffer_len,
2062                                                   PCI_DMA_FROMDEVICE);
2063
2064                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2065                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2066                 /* guarantee DD bit not set now before h/w gets descriptor
2067                  * this is the rest of the workaround for h/w double 
2068                  * writeback. */
2069                 rx_desc->status = 0;
2070
2071
2072                 if(++i == rx_ring->count) i = 0;
2073                 buffer_info = &rx_ring->buffer_info[i];
2074         }
2075
2076         if (likely(rx_ring->next_to_use != i)) {
2077                 rx_ring->next_to_use = i;
2078                 if (unlikely(i-- == 0))
2079                         i = (rx_ring->count - 1);
2080
2081                 /* Force memory writes to complete before letting h/w
2082                  * know there are new descriptors to fetch.  (Only
2083                  * applicable for weak-ordered memory model archs, such
2084                  * as IA-64). */
2085                 wmb();
2086                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2087         }
2088 }
2089
2090 /**
2091  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2092  * 
2093  * @param netdev network interface device structure
2094  * @param grp indicates to enable or disable tagging/stripping
2095  **/
2096 static void
2097 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2098 {
2099         struct ixgb_adapter *adapter = netdev_priv(netdev);
2100         uint32_t ctrl, rctl;
2101
2102         ixgb_irq_disable(adapter);
2103         adapter->vlgrp = grp;
2104
2105         if(grp) {
2106                 /* enable VLAN tag insert/strip */
2107                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2108                 ctrl |= IXGB_CTRL0_VME;
2109                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2110
2111                 /* enable VLAN receive filtering */
2112
2113                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2114                 rctl |= IXGB_RCTL_VFE;
2115                 rctl &= ~IXGB_RCTL_CFIEN;
2116                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2117         } else {
2118                 /* disable VLAN tag insert/strip */
2119
2120                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2121                 ctrl &= ~IXGB_CTRL0_VME;
2122                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2123
2124                 /* disable VLAN filtering */
2125
2126                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2127                 rctl &= ~IXGB_RCTL_VFE;
2128                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2129         }
2130
2131         ixgb_irq_enable(adapter);
2132 }
2133
2134 static void
2135 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2136 {
2137         struct ixgb_adapter *adapter = netdev_priv(netdev);
2138         uint32_t vfta, index;
2139
2140         /* add VID to filter table */
2141
2142         index = (vid >> 5) & 0x7F;
2143         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2144         vfta |= (1 << (vid & 0x1F));
2145         ixgb_write_vfta(&adapter->hw, index, vfta);
2146 }
2147
2148 static void
2149 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2150 {
2151         struct ixgb_adapter *adapter = netdev_priv(netdev);
2152         uint32_t vfta, index;
2153
2154         ixgb_irq_disable(adapter);
2155
2156         if(adapter->vlgrp)
2157                 adapter->vlgrp->vlan_devices[vid] = NULL;
2158
2159         ixgb_irq_enable(adapter);
2160
2161         /* remove VID from filter table*/
2162
2163         index = (vid >> 5) & 0x7F;
2164         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2165         vfta &= ~(1 << (vid & 0x1F));
2166         ixgb_write_vfta(&adapter->hw, index, vfta);
2167 }
2168
2169 static void
2170 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2171 {
2172         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2173
2174         if(adapter->vlgrp) {
2175                 uint16_t vid;
2176                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2177                         if(!adapter->vlgrp->vlan_devices[vid])
2178                                 continue;
2179                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2180                 }
2181         }
2182 }
2183
2184 #ifdef CONFIG_NET_POLL_CONTROLLER
2185 /*
2186  * Polling 'interrupt' - used by things like netconsole to send skbs
2187  * without having to re-enable interrupts. It's not called while
2188  * the interrupt routine is executing.
2189  */
2190
2191 static void ixgb_netpoll(struct net_device *dev)
2192 {
2193         struct ixgb_adapter *adapter = dev->priv;
2194
2195         disable_irq(adapter->pdev->irq);
2196         ixgb_intr(adapter->pdev->irq, dev, NULL);
2197         enable_irq(adapter->pdev->irq);
2198 }
2199 #endif
2200
2201 /* ixgb_main.c */