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