666207a9c039ee2875aa92a553f5f9e321573df7
[linux-2.6.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3   Intel PRO/10GbE Linux driver
4   Copyright(c) 1999 - 2008 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include "ixgb.h"
32
33 char ixgb_driver_name[] = "ixgb";
34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
35
36 #define DRIVERNAPI "-NAPI"
37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
38 const char ixgb_driver_version[] = DRV_VERSION;
39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
40
41 #define IXGB_CB_LENGTH 256
42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
43 module_param(copybreak, uint, 0644);
44 MODULE_PARM_DESC(copybreak,
45         "Maximum size of packet that is copied to a new buffer on receive");
46
47 /* ixgb_pci_tbl - PCI Device ID Table
48  *
49  * Wildcard entries (PCI_ANY_ID) should come last
50  * Last entry must be all 0s
51  *
52  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
53  *   Class, Class Mask, private data (not used) }
54  */
55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64
65         /* required last entry */
66         {0,}
67 };
68
69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
70
71 /* Local Function Prototypes */
72 static int ixgb_init_module(void);
73 static void ixgb_exit_module(void);
74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
75 static void __devexit ixgb_remove(struct pci_dev *pdev);
76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
77 static int ixgb_open(struct net_device *netdev);
78 static int ixgb_close(struct net_device *netdev);
79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_set_multi(struct net_device *netdev);
85 static void ixgb_watchdog(unsigned long data);
86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
87                                    struct net_device *netdev);
88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
90 static int ixgb_set_mac(struct net_device *netdev, void *p);
91 static irqreturn_t ixgb_intr(int irq, void *data);
92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
93
94 static int ixgb_clean(struct napi_struct *, int);
95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
97
98 static void ixgb_tx_timeout(struct net_device *dev);
99 static void ixgb_tx_timeout_task(struct work_struct *work);
100
101 static void ixgb_vlan_rx_register(struct net_device *netdev,
102                                   struct vlan_group *grp);
103 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
104 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
105 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
106
107 #ifdef CONFIG_NET_POLL_CONTROLLER
108 /* for netdump / net console */
109 static void ixgb_netpoll(struct net_device *dev);
110 #endif
111
112 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
113                              enum pci_channel_state state);
114 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
115 static void ixgb_io_resume (struct pci_dev *pdev);
116
117 static struct pci_error_handlers ixgb_err_handler = {
118         .error_detected = ixgb_io_error_detected,
119         .slot_reset = ixgb_io_slot_reset,
120         .resume = ixgb_io_resume,
121 };
122
123 static struct pci_driver ixgb_driver = {
124         .name     = ixgb_driver_name,
125         .id_table = ixgb_pci_tbl,
126         .probe    = ixgb_probe,
127         .remove   = __devexit_p(ixgb_remove),
128         .err_handler = &ixgb_err_handler
129 };
130
131 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
132 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
133 MODULE_LICENSE("GPL");
134 MODULE_VERSION(DRV_VERSION);
135
136 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
137 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
138 module_param(debug, int, 0);
139 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
140
141 /**
142  * ixgb_init_module - Driver Registration Routine
143  *
144  * ixgb_init_module is the first routine called when the driver is
145  * loaded. All it does is register with the PCI subsystem.
146  **/
147
148 static int __init
149 ixgb_init_module(void)
150 {
151         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
152         pr_info("%s\n", ixgb_copyright);
153
154         return pci_register_driver(&ixgb_driver);
155 }
156
157 module_init(ixgb_init_module);
158
159 /**
160  * ixgb_exit_module - Driver Exit Cleanup Routine
161  *
162  * ixgb_exit_module is called just before the driver is removed
163  * from memory.
164  **/
165
166 static void __exit
167 ixgb_exit_module(void)
168 {
169         pci_unregister_driver(&ixgb_driver);
170 }
171
172 module_exit(ixgb_exit_module);
173
174 /**
175  * ixgb_irq_disable - Mask off interrupt generation on the NIC
176  * @adapter: board private structure
177  **/
178
179 static void
180 ixgb_irq_disable(struct ixgb_adapter *adapter)
181 {
182         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
183         IXGB_WRITE_FLUSH(&adapter->hw);
184         synchronize_irq(adapter->pdev->irq);
185 }
186
187 /**
188  * ixgb_irq_enable - Enable default interrupt generation settings
189  * @adapter: board private structure
190  **/
191
192 static void
193 ixgb_irq_enable(struct ixgb_adapter *adapter)
194 {
195         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
196                   IXGB_INT_TXDW | IXGB_INT_LSC;
197         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
198                 val |= IXGB_INT_GPI0;
199         IXGB_WRITE_REG(&adapter->hw, IMS, val);
200         IXGB_WRITE_FLUSH(&adapter->hw);
201 }
202
203 int
204 ixgb_up(struct ixgb_adapter *adapter)
205 {
206         struct net_device *netdev = adapter->netdev;
207         int err, irq_flags = IRQF_SHARED;
208         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
209         struct ixgb_hw *hw = &adapter->hw;
210
211         /* hardware has been reset, we need to reload some things */
212
213         ixgb_rar_set(hw, netdev->dev_addr, 0);
214         ixgb_set_multi(netdev);
215
216         ixgb_restore_vlan(adapter);
217
218         ixgb_configure_tx(adapter);
219         ixgb_setup_rctl(adapter);
220         ixgb_configure_rx(adapter);
221         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
222
223         /* disable interrupts and get the hardware into a known state */
224         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
225
226         /* only enable MSI if bus is in PCI-X mode */
227         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
228                 err = pci_enable_msi(adapter->pdev);
229                 if (!err) {
230                         adapter->have_msi = 1;
231                         irq_flags = 0;
232                 }
233                 /* proceed to try to request regular interrupt */
234         }
235
236         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
237                           netdev->name, netdev);
238         if (err) {
239                 if (adapter->have_msi)
240                         pci_disable_msi(adapter->pdev);
241                 netif_err(adapter, probe, adapter->netdev,
242                           "Unable to allocate interrupt Error: %d\n", err);
243                 return err;
244         }
245
246         if ((hw->max_frame_size != max_frame) ||
247                 (hw->max_frame_size !=
248                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
249
250                 hw->max_frame_size = max_frame;
251
252                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
253
254                 if (hw->max_frame_size >
255                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
256                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
257
258                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
259                                 ctrl0 |= IXGB_CTRL0_JFE;
260                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
261                         }
262                 }
263         }
264
265         clear_bit(__IXGB_DOWN, &adapter->flags);
266
267         napi_enable(&adapter->napi);
268         ixgb_irq_enable(adapter);
269
270         netif_wake_queue(netdev);
271
272         mod_timer(&adapter->watchdog_timer, jiffies);
273
274         return 0;
275 }
276
277 void
278 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
279 {
280         struct net_device *netdev = adapter->netdev;
281
282         /* prevent the interrupt handler from restarting watchdog */
283         set_bit(__IXGB_DOWN, &adapter->flags);
284
285         napi_disable(&adapter->napi);
286         /* waiting for NAPI to complete can re-enable interrupts */
287         ixgb_irq_disable(adapter);
288         free_irq(adapter->pdev->irq, netdev);
289
290         if (adapter->have_msi)
291                 pci_disable_msi(adapter->pdev);
292
293         if (kill_watchdog)
294                 del_timer_sync(&adapter->watchdog_timer);
295
296         adapter->link_speed = 0;
297         adapter->link_duplex = 0;
298         netif_carrier_off(netdev);
299         netif_stop_queue(netdev);
300
301         ixgb_reset(adapter);
302         ixgb_clean_tx_ring(adapter);
303         ixgb_clean_rx_ring(adapter);
304 }
305
306 void
307 ixgb_reset(struct ixgb_adapter *adapter)
308 {
309         struct ixgb_hw *hw = &adapter->hw;
310
311         ixgb_adapter_stop(hw);
312         if (!ixgb_init_hw(hw))
313                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
314
315         /* restore frame size information */
316         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
317         if (hw->max_frame_size >
318             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
319                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
320                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
321                         ctrl0 |= IXGB_CTRL0_JFE;
322                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
323                 }
324         }
325 }
326
327 static const struct net_device_ops ixgb_netdev_ops = {
328         .ndo_open               = ixgb_open,
329         .ndo_stop               = ixgb_close,
330         .ndo_start_xmit         = ixgb_xmit_frame,
331         .ndo_get_stats          = ixgb_get_stats,
332         .ndo_set_multicast_list = ixgb_set_multi,
333         .ndo_validate_addr      = eth_validate_addr,
334         .ndo_set_mac_address    = ixgb_set_mac,
335         .ndo_change_mtu         = ixgb_change_mtu,
336         .ndo_tx_timeout         = ixgb_tx_timeout,
337         .ndo_vlan_rx_register   = ixgb_vlan_rx_register,
338         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
339         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
340 #ifdef CONFIG_NET_POLL_CONTROLLER
341         .ndo_poll_controller    = ixgb_netpoll,
342 #endif
343 };
344
345 /**
346  * ixgb_probe - Device Initialization Routine
347  * @pdev: PCI device information struct
348  * @ent: entry in ixgb_pci_tbl
349  *
350  * Returns 0 on success, negative on failure
351  *
352  * ixgb_probe initializes an adapter identified by a pci_dev structure.
353  * The OS initialization, configuring of the adapter private structure,
354  * and a hardware reset occur.
355  **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
359 {
360         struct net_device *netdev = NULL;
361         struct ixgb_adapter *adapter;
362         static int cards_found = 0;
363         int pci_using_dac;
364         int i;
365         int err;
366
367         err = pci_enable_device(pdev);
368         if (err)
369                 return err;
370
371         pci_using_dac = 0;
372         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
373         if (!err) {
374                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
375                 if (!err)
376                         pci_using_dac = 1;
377         } else {
378                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
379                 if (err) {
380                         err = dma_set_coherent_mask(&pdev->dev,
381                                                     DMA_BIT_MASK(32));
382                         if (err) {
383                                 pr_err("No usable DMA configuration, aborting\n");
384                                 goto err_dma_mask;
385                         }
386                 }
387         }
388
389         err = pci_request_regions(pdev, ixgb_driver_name);
390         if (err)
391                 goto err_request_regions;
392
393         pci_set_master(pdev);
394
395         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
396         if (!netdev) {
397                 err = -ENOMEM;
398                 goto err_alloc_etherdev;
399         }
400
401         SET_NETDEV_DEV(netdev, &pdev->dev);
402
403         pci_set_drvdata(pdev, netdev);
404         adapter = netdev_priv(netdev);
405         adapter->netdev = netdev;
406         adapter->pdev = pdev;
407         adapter->hw.back = adapter;
408         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
409
410         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
411         if (!adapter->hw.hw_addr) {
412                 err = -EIO;
413                 goto err_ioremap;
414         }
415
416         for (i = BAR_1; i <= BAR_5; i++) {
417                 if (pci_resource_len(pdev, i) == 0)
418                         continue;
419                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
420                         adapter->hw.io_base = pci_resource_start(pdev, i);
421                         break;
422                 }
423         }
424
425         netdev->netdev_ops = &ixgb_netdev_ops;
426         ixgb_set_ethtool_ops(netdev);
427         netdev->watchdog_timeo = 5 * HZ;
428         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
429
430         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
431
432         adapter->bd_number = cards_found;
433         adapter->link_speed = 0;
434         adapter->link_duplex = 0;
435
436         /* setup the private structure */
437
438         err = ixgb_sw_init(adapter);
439         if (err)
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                 netdev->vlan_features |= NETIF_F_HIGHDMA;
452         }
453
454         /* make sure the EEPROM is good */
455
456         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
457                 netif_err(adapter, probe, adapter->netdev,
458                           "The EEPROM Checksum Is Not Valid\n");
459                 err = -EIO;
460                 goto err_eeprom;
461         }
462
463         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
464         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
465
466         if (!is_valid_ether_addr(netdev->perm_addr)) {
467                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
468                 err = -EIO;
469                 goto err_eeprom;
470         }
471
472         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
473
474         init_timer(&adapter->watchdog_timer);
475         adapter->watchdog_timer.function = ixgb_watchdog;
476         adapter->watchdog_timer.data = (unsigned long)adapter;
477
478         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
479
480         strcpy(netdev->name, "eth%d");
481         err = register_netdev(netdev);
482         if (err)
483                 goto err_register;
484
485         /* carrier off reporting is important to ethtool even BEFORE open */
486         netif_carrier_off(netdev);
487
488         netif_info(adapter, probe, adapter->netdev,
489                    "Intel(R) PRO/10GbE Network Connection\n");
490         ixgb_check_options(adapter);
491         /* reset the hardware with the new settings */
492
493         ixgb_reset(adapter);
494
495         cards_found++;
496         return 0;
497
498 err_register:
499 err_sw_init:
500 err_eeprom:
501         iounmap(adapter->hw.hw_addr);
502 err_ioremap:
503         free_netdev(netdev);
504 err_alloc_etherdev:
505         pci_release_regions(pdev);
506 err_request_regions:
507 err_dma_mask:
508         pci_disable_device(pdev);
509         return err;
510 }
511
512 /**
513  * ixgb_remove - Device Removal Routine
514  * @pdev: PCI device information struct
515  *
516  * ixgb_remove is called by the PCI subsystem to alert the driver
517  * that it should release a PCI device.  The could be caused by a
518  * Hot-Plug event, or because the driver is going to be removed from
519  * memory.
520  **/
521
522 static void __devexit
523 ixgb_remove(struct pci_dev *pdev)
524 {
525         struct net_device *netdev = pci_get_drvdata(pdev);
526         struct ixgb_adapter *adapter = netdev_priv(netdev);
527
528         flush_scheduled_work();
529
530         unregister_netdev(netdev);
531
532         iounmap(adapter->hw.hw_addr);
533         pci_release_regions(pdev);
534
535         free_netdev(netdev);
536 }
537
538 /**
539  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
540  * @adapter: board private structure to initialize
541  *
542  * ixgb_sw_init initializes the Adapter private data structure.
543  * Fields are initialized based on PCI device information and
544  * OS network device settings (MTU size).
545  **/
546
547 static int __devinit
548 ixgb_sw_init(struct ixgb_adapter *adapter)
549 {
550         struct ixgb_hw *hw = &adapter->hw;
551         struct net_device *netdev = adapter->netdev;
552         struct pci_dev *pdev = adapter->pdev;
553
554         /* PCI config space info */
555
556         hw->vendor_id = pdev->vendor;
557         hw->device_id = pdev->device;
558         hw->subsystem_vendor_id = pdev->subsystem_vendor;
559         hw->subsystem_id = pdev->subsystem_device;
560
561         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
562         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
563
564         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
565             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
566             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
567             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
568                 hw->mac_type = ixgb_82597;
569         else {
570                 /* should never have loaded on this device */
571                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
572         }
573
574         /* enable flow control to be programmed */
575         hw->fc.send_xon = 1;
576
577         set_bit(__IXGB_DOWN, &adapter->flags);
578         return 0;
579 }
580
581 /**
582  * ixgb_open - Called when a network interface is made active
583  * @netdev: network interface device structure
584  *
585  * Returns 0 on success, negative value on failure
586  *
587  * The open entry point is called when a network interface is made
588  * active by the system (IFF_UP).  At this point all resources needed
589  * for transmit and receive operations are allocated, the interrupt
590  * handler is registered with the OS, the watchdog timer is started,
591  * and the stack is notified that the interface is ready.
592  **/
593
594 static int
595 ixgb_open(struct net_device *netdev)
596 {
597         struct ixgb_adapter *adapter = netdev_priv(netdev);
598         int err;
599
600         /* allocate transmit descriptors */
601         err = ixgb_setup_tx_resources(adapter);
602         if (err)
603                 goto err_setup_tx;
604
605         netif_carrier_off(netdev);
606
607         /* allocate receive descriptors */
608
609         err = ixgb_setup_rx_resources(adapter);
610         if (err)
611                 goto err_setup_rx;
612
613         err = ixgb_up(adapter);
614         if (err)
615                 goto err_up;
616
617         netif_start_queue(netdev);
618
619         return 0;
620
621 err_up:
622         ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624         ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626         ixgb_reset(adapter);
627
628         return err;
629 }
630
631 /**
632  * ixgb_close - Disables a network interface
633  * @netdev: network interface device structure
634  *
635  * Returns 0, this is not allowed to fail
636  *
637  * The close entry point is called when an interface is de-activated
638  * by the OS.  The hardware is still under the drivers control, but
639  * needs to be disabled.  A global MAC reset is issued to stop the
640  * hardware, and all transmit and receive resources are freed.
641  **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646         struct ixgb_adapter *adapter = netdev_priv(netdev);
647
648         ixgb_down(adapter, true);
649
650         ixgb_free_tx_resources(adapter);
651         ixgb_free_rx_resources(adapter);
652
653         return 0;
654 }
655
656 /**
657  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658  * @adapter: board private structure
659  *
660  * Return 0 on success, negative on failure
661  **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667         struct pci_dev *pdev = adapter->pdev;
668         int size;
669
670         size = sizeof(struct ixgb_buffer) * txdr->count;
671         txdr->buffer_info = vmalloc(size);
672         if (!txdr->buffer_info) {
673                 netif_err(adapter, probe, adapter->netdev,
674                           "Unable to allocate transmit descriptor ring memory\n");
675                 return -ENOMEM;
676         }
677         memset(txdr->buffer_info, 0, size);
678
679         /* round up to nearest 4K */
680
681         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
682         txdr->size = ALIGN(txdr->size, 4096);
683
684         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
685                                         GFP_KERNEL);
686         if (!txdr->desc) {
687                 vfree(txdr->buffer_info);
688                 netif_err(adapter, probe, adapter->netdev,
689                           "Unable to allocate transmit descriptor memory\n");
690                 return -ENOMEM;
691         }
692         memset(txdr->desc, 0, txdr->size);
693
694         txdr->next_to_use = 0;
695         txdr->next_to_clean = 0;
696
697         return 0;
698 }
699
700 /**
701  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
702  * @adapter: board private structure
703  *
704  * Configure the Tx unit of the MAC after a reset.
705  **/
706
707 static void
708 ixgb_configure_tx(struct ixgb_adapter *adapter)
709 {
710         u64 tdba = adapter->tx_ring.dma;
711         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
712         u32 tctl;
713         struct ixgb_hw *hw = &adapter->hw;
714
715         /* Setup the Base and Length of the Tx Descriptor Ring
716          * tx_ring.dma can be either a 32 or 64 bit value
717          */
718
719         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
720         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
721
722         IXGB_WRITE_REG(hw, TDLEN, tdlen);
723
724         /* Setup the HW Tx Head and Tail descriptor pointers */
725
726         IXGB_WRITE_REG(hw, TDH, 0);
727         IXGB_WRITE_REG(hw, TDT, 0);
728
729         /* don't set up txdctl, it induces performance problems if configured
730          * incorrectly */
731         /* Set the Tx Interrupt Delay register */
732
733         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
734
735         /* Program the Transmit Control Register */
736
737         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
738         IXGB_WRITE_REG(hw, TCTL, tctl);
739
740         /* Setup Transmit Descriptor Settings for this adapter */
741         adapter->tx_cmd_type =
742                 IXGB_TX_DESC_TYPE |
743                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
744 }
745
746 /**
747  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
748  * @adapter: board private structure
749  *
750  * Returns 0 on success, negative on failure
751  **/
752
753 int
754 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
755 {
756         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
757         struct pci_dev *pdev = adapter->pdev;
758         int size;
759
760         size = sizeof(struct ixgb_buffer) * rxdr->count;
761         rxdr->buffer_info = vmalloc(size);
762         if (!rxdr->buffer_info) {
763                 netif_err(adapter, probe, adapter->netdev,
764                           "Unable to allocate receive descriptor ring\n");
765                 return -ENOMEM;
766         }
767         memset(rxdr->buffer_info, 0, size);
768
769         /* Round up to nearest 4K */
770
771         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
772         rxdr->size = ALIGN(rxdr->size, 4096);
773
774         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
775                                         GFP_KERNEL);
776
777         if (!rxdr->desc) {
778                 vfree(rxdr->buffer_info);
779                 netif_err(adapter, probe, adapter->netdev,
780                           "Unable to allocate receive descriptors\n");
781                 return -ENOMEM;
782         }
783         memset(rxdr->desc, 0, rxdr->size);
784
785         rxdr->next_to_clean = 0;
786         rxdr->next_to_use = 0;
787
788         return 0;
789 }
790
791 /**
792  * ixgb_setup_rctl - configure the receive control register
793  * @adapter: Board private structure
794  **/
795
796 static void
797 ixgb_setup_rctl(struct ixgb_adapter *adapter)
798 {
799         u32 rctl;
800
801         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
802
803         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
804
805         rctl |=
806                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
807                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
808                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
809
810         rctl |= IXGB_RCTL_SECRC;
811
812         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
813                 rctl |= IXGB_RCTL_BSIZE_2048;
814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
815                 rctl |= IXGB_RCTL_BSIZE_4096;
816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
817                 rctl |= IXGB_RCTL_BSIZE_8192;
818         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
819                 rctl |= IXGB_RCTL_BSIZE_16384;
820
821         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
822 }
823
824 /**
825  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
826  * @adapter: board private structure
827  *
828  * Configure the Rx unit of the MAC after a reset.
829  **/
830
831 static void
832 ixgb_configure_rx(struct ixgb_adapter *adapter)
833 {
834         u64 rdba = adapter->rx_ring.dma;
835         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
836         struct ixgb_hw *hw = &adapter->hw;
837         u32 rctl;
838         u32 rxcsum;
839
840         /* make sure receives are disabled while setting up the descriptors */
841
842         rctl = IXGB_READ_REG(hw, RCTL);
843         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
844
845         /* set the Receive Delay Timer Register */
846
847         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
848
849         /* Setup the Base and Length of the Rx Descriptor Ring */
850
851         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
852         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
853
854         IXGB_WRITE_REG(hw, RDLEN, rdlen);
855
856         /* Setup the HW Rx Head and Tail Descriptor Pointers */
857         IXGB_WRITE_REG(hw, RDH, 0);
858         IXGB_WRITE_REG(hw, RDT, 0);
859
860         /* due to the hardware errata with RXDCTL, we are unable to use any of
861          * the performance enhancing features of it without causing other
862          * subtle bugs, some of the bugs could include receive length
863          * corruption at high data rates (WTHRESH > 0) and/or receive
864          * descriptor ring irregularites (particularly in hardware cache) */
865         IXGB_WRITE_REG(hw, RXDCTL, 0);
866
867         /* Enable Receive Checksum Offload for TCP and UDP */
868         if (adapter->rx_csum) {
869                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
870                 rxcsum |= IXGB_RXCSUM_TUOFL;
871                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
872         }
873
874         /* Enable Receives */
875
876         IXGB_WRITE_REG(hw, RCTL, rctl);
877 }
878
879 /**
880  * ixgb_free_tx_resources - Free Tx Resources
881  * @adapter: board private structure
882  *
883  * Free all transmit software resources
884  **/
885
886 void
887 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
888 {
889         struct pci_dev *pdev = adapter->pdev;
890
891         ixgb_clean_tx_ring(adapter);
892
893         vfree(adapter->tx_ring.buffer_info);
894         adapter->tx_ring.buffer_info = NULL;
895
896         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
897                           adapter->tx_ring.desc, adapter->tx_ring.dma);
898
899         adapter->tx_ring.desc = NULL;
900 }
901
902 static void
903 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
904                                 struct ixgb_buffer *buffer_info)
905 {
906         if (buffer_info->dma) {
907                 if (buffer_info->mapped_as_page)
908                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
909                                        buffer_info->length, DMA_TO_DEVICE);
910                 else
911                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
912                                          buffer_info->length, DMA_TO_DEVICE);
913                 buffer_info->dma = 0;
914         }
915
916         if (buffer_info->skb) {
917                 dev_kfree_skb_any(buffer_info->skb);
918                 buffer_info->skb = NULL;
919         }
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         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
979                           rx_ring->dma);
980
981         rx_ring->desc = NULL;
982 }
983
984 /**
985  * ixgb_clean_rx_ring - Free Rx Buffers
986  * @adapter: board private structure
987  **/
988
989 static void
990 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
991 {
992         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
993         struct ixgb_buffer *buffer_info;
994         struct pci_dev *pdev = adapter->pdev;
995         unsigned long size;
996         unsigned int i;
997
998         /* Free all the Rx ring sk_buffs */
999
1000         for (i = 0; i < rx_ring->count; i++) {
1001                 buffer_info = &rx_ring->buffer_info[i];
1002                 if (buffer_info->dma) {
1003                         dma_unmap_single(&pdev->dev,
1004                                          buffer_info->dma,
1005                                          buffer_info->length,
1006                                          DMA_FROM_DEVICE);
1007                         buffer_info->dma = 0;
1008                         buffer_info->length = 0;
1009                 }
1010
1011                 if (buffer_info->skb) {
1012                         dev_kfree_skb(buffer_info->skb);
1013                         buffer_info->skb = NULL;
1014                 }
1015         }
1016
1017         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1018         memset(rx_ring->buffer_info, 0, size);
1019
1020         /* Zero out the descriptor ring */
1021
1022         memset(rx_ring->desc, 0, rx_ring->size);
1023
1024         rx_ring->next_to_clean = 0;
1025         rx_ring->next_to_use = 0;
1026
1027         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1028         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1029 }
1030
1031 /**
1032  * ixgb_set_mac - Change the Ethernet Address of the NIC
1033  * @netdev: network interface device structure
1034  * @p: pointer to an address structure
1035  *
1036  * Returns 0 on success, negative on failure
1037  **/
1038
1039 static int
1040 ixgb_set_mac(struct net_device *netdev, void *p)
1041 {
1042         struct ixgb_adapter *adapter = netdev_priv(netdev);
1043         struct sockaddr *addr = p;
1044
1045         if (!is_valid_ether_addr(addr->sa_data))
1046                 return -EADDRNOTAVAIL;
1047
1048         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1049
1050         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1051
1052         return 0;
1053 }
1054
1055 /**
1056  * ixgb_set_multi - Multicast and Promiscuous mode set
1057  * @netdev: network interface device structure
1058  *
1059  * The set_multi entry point is called whenever the multicast address
1060  * list or the network interface flags are updated.  This routine is
1061  * responsible for configuring the hardware for proper multicast,
1062  * promiscuous mode, and all-multi behavior.
1063  **/
1064
1065 static void
1066 ixgb_set_multi(struct net_device *netdev)
1067 {
1068         struct ixgb_adapter *adapter = netdev_priv(netdev);
1069         struct ixgb_hw *hw = &adapter->hw;
1070         struct netdev_hw_addr *ha;
1071         u32 rctl;
1072         int i;
1073
1074         /* Check for Promiscuous and All Multicast modes */
1075
1076         rctl = IXGB_READ_REG(hw, RCTL);
1077
1078         if (netdev->flags & IFF_PROMISC) {
1079                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1080                 rctl &= ~IXGB_RCTL_VFE;
1081         } else {
1082                 if (netdev->flags & IFF_ALLMULTI) {
1083                         rctl |= IXGB_RCTL_MPE;
1084                         rctl &= ~IXGB_RCTL_UPE;
1085                 } else {
1086                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1087                 }
1088                 rctl |= IXGB_RCTL_VFE;
1089         }
1090
1091         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1092                 rctl |= IXGB_RCTL_MPE;
1093                 IXGB_WRITE_REG(hw, RCTL, rctl);
1094         } else {
1095                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1096                             IXGB_ETH_LENGTH_OF_ADDRESS];
1097
1098                 IXGB_WRITE_REG(hw, RCTL, rctl);
1099
1100                 i = 0;
1101                 netdev_for_each_mc_addr(ha, netdev)
1102                         memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1103                                ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1104
1105                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1106         }
1107 }
1108
1109 /**
1110  * ixgb_watchdog - Timer Call-back
1111  * @data: pointer to netdev cast into an unsigned long
1112  **/
1113
1114 static void
1115 ixgb_watchdog(unsigned long data)
1116 {
1117         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1118         struct net_device *netdev = adapter->netdev;
1119         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1120
1121         ixgb_check_for_link(&adapter->hw);
1122
1123         if (ixgb_check_for_bad_link(&adapter->hw)) {
1124                 /* force the reset path */
1125                 netif_stop_queue(netdev);
1126         }
1127
1128         if (adapter->hw.link_up) {
1129                 if (!netif_carrier_ok(netdev)) {
1130                         netdev_info(netdev,
1131                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1132                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1133                                     "RX/TX" :
1134                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1135                                      "RX" :
1136                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1137                                     "TX" : "None");
1138                         adapter->link_speed = 10000;
1139                         adapter->link_duplex = FULL_DUPLEX;
1140                         netif_carrier_on(netdev);
1141                 }
1142         } else {
1143                 if (netif_carrier_ok(netdev)) {
1144                         adapter->link_speed = 0;
1145                         adapter->link_duplex = 0;
1146                         netdev_info(netdev, "NIC Link is Down\n");
1147                         netif_carrier_off(netdev);
1148                 }
1149         }
1150
1151         ixgb_update_stats(adapter);
1152
1153         if (!netif_carrier_ok(netdev)) {
1154                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1155                         /* We've lost link, so the controller stops DMA,
1156                          * but we've got queued Tx work that's never going
1157                          * to get done, so reset controller to flush Tx.
1158                          * (Do the reset outside of interrupt context). */
1159                         schedule_work(&adapter->tx_timeout_task);
1160                         /* return immediately since reset is imminent */
1161                         return;
1162                 }
1163         }
1164
1165         /* Force detection of hung controller every watchdog period */
1166         adapter->detect_tx_hung = true;
1167
1168         /* generate an interrupt to force clean up of any stragglers */
1169         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1170
1171         /* Reset the timer */
1172         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1173 }
1174
1175 #define IXGB_TX_FLAGS_CSUM              0x00000001
1176 #define IXGB_TX_FLAGS_VLAN              0x00000002
1177 #define IXGB_TX_FLAGS_TSO               0x00000004
1178
1179 static int
1180 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1181 {
1182         struct ixgb_context_desc *context_desc;
1183         unsigned int i;
1184         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1185         u16 ipcse, tucse, mss;
1186         int err;
1187
1188         if (likely(skb_is_gso(skb))) {
1189                 struct ixgb_buffer *buffer_info;
1190                 struct iphdr *iph;
1191
1192                 if (skb_header_cloned(skb)) {
1193                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1194                         if (err)
1195                                 return err;
1196                 }
1197
1198                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1199                 mss = skb_shinfo(skb)->gso_size;
1200                 iph = ip_hdr(skb);
1201                 iph->tot_len = 0;
1202                 iph->check = 0;
1203                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1204                                                          iph->daddr, 0,
1205                                                          IPPROTO_TCP, 0);
1206                 ipcss = skb_network_offset(skb);
1207                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1208                 ipcse = skb_transport_offset(skb) - 1;
1209                 tucss = skb_transport_offset(skb);
1210                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1211                 tucse = 0;
1212
1213                 i = adapter->tx_ring.next_to_use;
1214                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1215                 buffer_info = &adapter->tx_ring.buffer_info[i];
1216                 WARN_ON(buffer_info->dma != 0);
1217
1218                 context_desc->ipcss = ipcss;
1219                 context_desc->ipcso = ipcso;
1220                 context_desc->ipcse = cpu_to_le16(ipcse);
1221                 context_desc->tucss = tucss;
1222                 context_desc->tucso = tucso;
1223                 context_desc->tucse = cpu_to_le16(tucse);
1224                 context_desc->mss = cpu_to_le16(mss);
1225                 context_desc->hdr_len = hdr_len;
1226                 context_desc->status = 0;
1227                 context_desc->cmd_type_len = cpu_to_le32(
1228                                                   IXGB_CONTEXT_DESC_TYPE
1229                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1230                                                 | IXGB_CONTEXT_DESC_CMD_IP
1231                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1232                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1233                                                 | (skb->len - (hdr_len)));
1234
1235
1236                 if (++i == adapter->tx_ring.count) i = 0;
1237                 adapter->tx_ring.next_to_use = i;
1238
1239                 return 1;
1240         }
1241
1242         return 0;
1243 }
1244
1245 static bool
1246 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1247 {
1248         struct ixgb_context_desc *context_desc;
1249         unsigned int i;
1250         u8 css, cso;
1251
1252         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1253                 struct ixgb_buffer *buffer_info;
1254                 css = skb_transport_offset(skb);
1255                 cso = css + skb->csum_offset;
1256
1257                 i = adapter->tx_ring.next_to_use;
1258                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1259                 buffer_info = &adapter->tx_ring.buffer_info[i];
1260                 WARN_ON(buffer_info->dma != 0);
1261
1262                 context_desc->tucss = css;
1263                 context_desc->tucso = cso;
1264                 context_desc->tucse = 0;
1265                 /* zero out any previously existing data in one instruction */
1266                 *(u32 *)&(context_desc->ipcss) = 0;
1267                 context_desc->status = 0;
1268                 context_desc->hdr_len = 0;
1269                 context_desc->mss = 0;
1270                 context_desc->cmd_type_len =
1271                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1272                                     | IXGB_TX_DESC_CMD_IDE);
1273
1274                 if (++i == adapter->tx_ring.count) i = 0;
1275                 adapter->tx_ring.next_to_use = i;
1276
1277                 return true;
1278         }
1279
1280         return false;
1281 }
1282
1283 #define IXGB_MAX_TXD_PWR        14
1284 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1285
1286 static int
1287 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1288             unsigned int first)
1289 {
1290         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1291         struct pci_dev *pdev = adapter->pdev;
1292         struct ixgb_buffer *buffer_info;
1293         int len = skb_headlen(skb);
1294         unsigned int offset = 0, size, count = 0, i;
1295         unsigned int mss = skb_shinfo(skb)->gso_size;
1296         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1297         unsigned int f;
1298
1299         i = tx_ring->next_to_use;
1300
1301         while (len) {
1302                 buffer_info = &tx_ring->buffer_info[i];
1303                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1304                 /* Workaround for premature desc write-backs
1305                  * in TSO mode.  Append 4-byte sentinel desc */
1306                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1307                         size -= 4;
1308
1309                 buffer_info->length = size;
1310                 WARN_ON(buffer_info->dma != 0);
1311                 buffer_info->time_stamp = jiffies;
1312                 buffer_info->mapped_as_page = false;
1313                 buffer_info->dma = dma_map_single(&pdev->dev,
1314                                                   skb->data + offset,
1315                                                   size, DMA_TO_DEVICE);
1316                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1317                         goto dma_error;
1318                 buffer_info->next_to_watch = 0;
1319
1320                 len -= size;
1321                 offset += size;
1322                 count++;
1323                 if (len) {
1324                         i++;
1325                         if (i == tx_ring->count)
1326                                 i = 0;
1327                 }
1328         }
1329
1330         for (f = 0; f < nr_frags; f++) {
1331                 struct skb_frag_struct *frag;
1332
1333                 frag = &skb_shinfo(skb)->frags[f];
1334                 len = frag->size;
1335                 offset = frag->page_offset;
1336
1337                 while (len) {
1338                         i++;
1339                         if (i == tx_ring->count)
1340                                 i = 0;
1341
1342                         buffer_info = &tx_ring->buffer_info[i];
1343                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1344
1345                         /* Workaround for premature desc write-backs
1346                          * in TSO mode.  Append 4-byte sentinel desc */
1347                         if (unlikely(mss && (f == (nr_frags - 1))
1348                                      && size == len && size > 8))
1349                                 size -= 4;
1350
1351                         buffer_info->length = size;
1352                         buffer_info->time_stamp = jiffies;
1353                         buffer_info->mapped_as_page = true;
1354                         buffer_info->dma =
1355                                 dma_map_page(&pdev->dev, frag->page,
1356                                              offset, size, DMA_TO_DEVICE);
1357                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1358                                 goto dma_error;
1359                         buffer_info->next_to_watch = 0;
1360
1361                         len -= size;
1362                         offset += size;
1363                         count++;
1364                 }
1365         }
1366         tx_ring->buffer_info[i].skb = skb;
1367         tx_ring->buffer_info[first].next_to_watch = i;
1368
1369         return count;
1370
1371 dma_error:
1372         dev_err(&pdev->dev, "TX DMA map failed\n");
1373         buffer_info->dma = 0;
1374         if (count)
1375                 count--;
1376
1377         while (count--) {
1378                 if (i==0)
1379                         i += tx_ring->count;
1380                 i--;
1381                 buffer_info = &tx_ring->buffer_info[i];
1382                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1383         }
1384
1385         return 0;
1386 }
1387
1388 static void
1389 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1390 {
1391         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1392         struct ixgb_tx_desc *tx_desc = NULL;
1393         struct ixgb_buffer *buffer_info;
1394         u32 cmd_type_len = adapter->tx_cmd_type;
1395         u8 status = 0;
1396         u8 popts = 0;
1397         unsigned int i;
1398
1399         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1400                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1401                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1402         }
1403
1404         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1405                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1406
1407         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1408                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1409
1410         i = tx_ring->next_to_use;
1411
1412         while (count--) {
1413                 buffer_info = &tx_ring->buffer_info[i];
1414                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1415                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1416                 tx_desc->cmd_type_len =
1417                         cpu_to_le32(cmd_type_len | buffer_info->length);
1418                 tx_desc->status = status;
1419                 tx_desc->popts = popts;
1420                 tx_desc->vlan = cpu_to_le16(vlan_id);
1421
1422                 if (++i == tx_ring->count) i = 0;
1423         }
1424
1425         tx_desc->cmd_type_len |=
1426                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1427
1428         /* Force memory writes to complete before letting h/w
1429          * know there are new descriptors to fetch.  (Only
1430          * applicable for weak-ordered memory model archs,
1431          * such as IA-64). */
1432         wmb();
1433
1434         tx_ring->next_to_use = i;
1435         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1436 }
1437
1438 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1439 {
1440         struct ixgb_adapter *adapter = netdev_priv(netdev);
1441         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1442
1443         netif_stop_queue(netdev);
1444         /* Herbert's original patch had:
1445          *  smp_mb__after_netif_stop_queue();
1446          * but since that doesn't exist yet, just open code it. */
1447         smp_mb();
1448
1449         /* We need to check again in a case another CPU has just
1450          * made room available. */
1451         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1452                 return -EBUSY;
1453
1454         /* A reprieve! */
1455         netif_start_queue(netdev);
1456         ++adapter->restart_queue;
1457         return 0;
1458 }
1459
1460 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1461                               struct ixgb_desc_ring *tx_ring, int size)
1462 {
1463         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1464                 return 0;
1465         return __ixgb_maybe_stop_tx(netdev, size);
1466 }
1467
1468
1469 /* Tx Descriptors needed, worst case */
1470 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1471                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1472 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1473         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1474         + 1 /* one more needed for sentinel TSO workaround */
1475
1476 static netdev_tx_t
1477 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1478 {
1479         struct ixgb_adapter *adapter = netdev_priv(netdev);
1480         unsigned int first;
1481         unsigned int tx_flags = 0;
1482         int vlan_id = 0;
1483         int count = 0;
1484         int tso;
1485
1486         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1487                 dev_kfree_skb(skb);
1488                 return NETDEV_TX_OK;
1489         }
1490
1491         if (skb->len <= 0) {
1492                 dev_kfree_skb(skb);
1493                 return NETDEV_TX_OK;
1494         }
1495
1496         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1497                      DESC_NEEDED)))
1498                 return NETDEV_TX_BUSY;
1499
1500         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1501                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1502                 vlan_id = vlan_tx_tag_get(skb);
1503         }
1504
1505         first = adapter->tx_ring.next_to_use;
1506
1507         tso = ixgb_tso(adapter, skb);
1508         if (tso < 0) {
1509                 dev_kfree_skb(skb);
1510                 return NETDEV_TX_OK;
1511         }
1512
1513         if (likely(tso))
1514                 tx_flags |= IXGB_TX_FLAGS_TSO;
1515         else if (ixgb_tx_csum(adapter, skb))
1516                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1517
1518         count = ixgb_tx_map(adapter, skb, first);
1519
1520         if (count) {
1521                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1522                 /* Make sure there is space in the ring for the next send. */
1523                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1524
1525         } else {
1526                 dev_kfree_skb_any(skb);
1527                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1528                 adapter->tx_ring.next_to_use = first;
1529         }
1530
1531         return NETDEV_TX_OK;
1532 }
1533
1534 /**
1535  * ixgb_tx_timeout - Respond to a Tx Hang
1536  * @netdev: network interface device structure
1537  **/
1538
1539 static void
1540 ixgb_tx_timeout(struct net_device *netdev)
1541 {
1542         struct ixgb_adapter *adapter = netdev_priv(netdev);
1543
1544         /* Do the reset outside of interrupt context */
1545         schedule_work(&adapter->tx_timeout_task);
1546 }
1547
1548 static void
1549 ixgb_tx_timeout_task(struct work_struct *work)
1550 {
1551         struct ixgb_adapter *adapter =
1552                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1553
1554         adapter->tx_timeout_count++;
1555         ixgb_down(adapter, true);
1556         ixgb_up(adapter);
1557 }
1558
1559 /**
1560  * ixgb_get_stats - Get System Network Statistics
1561  * @netdev: network interface device structure
1562  *
1563  * Returns the address of the device statistics structure.
1564  * The statistics are actually updated from the timer callback.
1565  **/
1566
1567 static struct net_device_stats *
1568 ixgb_get_stats(struct net_device *netdev)
1569 {
1570         return &netdev->stats;
1571 }
1572
1573 /**
1574  * ixgb_change_mtu - Change the Maximum Transfer Unit
1575  * @netdev: network interface device structure
1576  * @new_mtu: new value for maximum frame size
1577  *
1578  * Returns 0 on success, negative on failure
1579  **/
1580
1581 static int
1582 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1583 {
1584         struct ixgb_adapter *adapter = netdev_priv(netdev);
1585         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1586         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1587
1588         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1589         if ((new_mtu < 68) ||
1590             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1591                 netif_err(adapter, probe, adapter->netdev,
1592                           "Invalid MTU setting %d\n", new_mtu);
1593                 return -EINVAL;
1594         }
1595
1596         if (old_max_frame == max_frame)
1597                 return 0;
1598
1599         if (netif_running(netdev))
1600                 ixgb_down(adapter, true);
1601
1602         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1603
1604         netdev->mtu = new_mtu;
1605
1606         if (netif_running(netdev))
1607                 ixgb_up(adapter);
1608
1609         return 0;
1610 }
1611
1612 /**
1613  * ixgb_update_stats - Update the board statistics counters.
1614  * @adapter: board private structure
1615  **/
1616
1617 void
1618 ixgb_update_stats(struct ixgb_adapter *adapter)
1619 {
1620         struct net_device *netdev = adapter->netdev;
1621         struct pci_dev *pdev = adapter->pdev;
1622
1623         /* Prevent stats update while adapter is being reset */
1624         if (pci_channel_offline(pdev))
1625                 return;
1626
1627         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1628            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1629                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1630                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1631                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1632                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1633
1634                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1635                 /* fix up multicast stats by removing broadcasts */
1636                 if (multi >= bcast)
1637                         multi -= bcast;
1638
1639                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1640                 adapter->stats.mprch += (multi >> 32);
1641                 adapter->stats.bprcl += bcast_l;
1642                 adapter->stats.bprch += bcast_h;
1643         } else {
1644                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1645                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1646                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1647                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1648         }
1649         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1650         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1651         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1652         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1653         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1654         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1655         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1656         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1657         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1658         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1659         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1660         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1661         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1662         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1663         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1664         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1665         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1666         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1667         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1668         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1669         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1670         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1671         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1672         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1673         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1674         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1675         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1676         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1677         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1678         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1679         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1680         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1681         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1682         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1683         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1684         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1685         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1686         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1687         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1688         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1689         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1690         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1691         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1692         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1693         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1694         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1695         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1696         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1697         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1698         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1699         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1700         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1701         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1702         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1703         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1704         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1705
1706         /* Fill out the OS statistics structure */
1707
1708         netdev->stats.rx_packets = adapter->stats.gprcl;
1709         netdev->stats.tx_packets = adapter->stats.gptcl;
1710         netdev->stats.rx_bytes = adapter->stats.gorcl;
1711         netdev->stats.tx_bytes = adapter->stats.gotcl;
1712         netdev->stats.multicast = adapter->stats.mprcl;
1713         netdev->stats.collisions = 0;
1714
1715         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1716          * with a length in the type/len field */
1717         netdev->stats.rx_errors =
1718             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1719             adapter->stats.ruc +
1720             adapter->stats.roc /*+ adapter->stats.rlec */  +
1721             adapter->stats.icbc +
1722             adapter->stats.ecbc + adapter->stats.mpc;
1723
1724         /* see above
1725          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1726          */
1727
1728         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1729         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1730         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1731         netdev->stats.rx_over_errors = adapter->stats.mpc;
1732
1733         netdev->stats.tx_errors = 0;
1734         netdev->stats.rx_frame_errors = 0;
1735         netdev->stats.tx_aborted_errors = 0;
1736         netdev->stats.tx_carrier_errors = 0;
1737         netdev->stats.tx_fifo_errors = 0;
1738         netdev->stats.tx_heartbeat_errors = 0;
1739         netdev->stats.tx_window_errors = 0;
1740 }
1741
1742 #define IXGB_MAX_INTR 10
1743 /**
1744  * ixgb_intr - Interrupt Handler
1745  * @irq: interrupt number
1746  * @data: pointer to a network interface device structure
1747  **/
1748
1749 static irqreturn_t
1750 ixgb_intr(int irq, void *data)
1751 {
1752         struct net_device *netdev = data;
1753         struct ixgb_adapter *adapter = netdev_priv(netdev);
1754         struct ixgb_hw *hw = &adapter->hw;
1755         u32 icr = IXGB_READ_REG(hw, ICR);
1756
1757         if (unlikely(!icr))
1758                 return IRQ_NONE;  /* Not our interrupt */
1759
1760         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1761                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1762                         mod_timer(&adapter->watchdog_timer, jiffies);
1763
1764         if (napi_schedule_prep(&adapter->napi)) {
1765
1766                 /* Disable interrupts and register for poll. The flush
1767                   of the posted write is intentionally left out.
1768                 */
1769
1770                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1771                 __napi_schedule(&adapter->napi);
1772         }
1773         return IRQ_HANDLED;
1774 }
1775
1776 /**
1777  * ixgb_clean - NAPI Rx polling callback
1778  * @adapter: board private structure
1779  **/
1780
1781 static int
1782 ixgb_clean(struct napi_struct *napi, int budget)
1783 {
1784         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1785         int work_done = 0;
1786
1787         ixgb_clean_tx_irq(adapter);
1788         ixgb_clean_rx_irq(adapter, &work_done, budget);
1789
1790         /* If budget not fully consumed, exit the polling mode */
1791         if (work_done < budget) {
1792                 napi_complete(napi);
1793                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1794                         ixgb_irq_enable(adapter);
1795         }
1796
1797         return work_done;
1798 }
1799
1800 /**
1801  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1802  * @adapter: board private structure
1803  **/
1804
1805 static bool
1806 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1807 {
1808         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1809         struct net_device *netdev = adapter->netdev;
1810         struct ixgb_tx_desc *tx_desc, *eop_desc;
1811         struct ixgb_buffer *buffer_info;
1812         unsigned int i, eop;
1813         bool cleaned = false;
1814
1815         i = tx_ring->next_to_clean;
1816         eop = tx_ring->buffer_info[i].next_to_watch;
1817         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1818
1819         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1820
1821                 rmb(); /* read buffer_info after eop_desc */
1822                 for (cleaned = false; !cleaned; ) {
1823                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1824                         buffer_info = &tx_ring->buffer_info[i];
1825
1826                         if (tx_desc->popts &
1827                            (IXGB_TX_DESC_POPTS_TXSM |
1828                             IXGB_TX_DESC_POPTS_IXSM))
1829                                 adapter->hw_csum_tx_good++;
1830
1831                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1832
1833                         *(u32 *)&(tx_desc->status) = 0;
1834
1835                         cleaned = (i == eop);
1836                         if (++i == tx_ring->count) i = 0;
1837                 }
1838
1839                 eop = tx_ring->buffer_info[i].next_to_watch;
1840                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1841         }
1842
1843         tx_ring->next_to_clean = i;
1844
1845         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1846                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1847                 /* Make sure that anybody stopping the queue after this
1848                  * sees the new next_to_clean. */
1849                 smp_mb();
1850
1851                 if (netif_queue_stopped(netdev) &&
1852                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1853                         netif_wake_queue(netdev);
1854                         ++adapter->restart_queue;
1855                 }
1856         }
1857
1858         if (adapter->detect_tx_hung) {
1859                 /* detect a transmit hang in hardware, this serializes the
1860                  * check with the clearing of time_stamp and movement of i */
1861                 adapter->detect_tx_hung = false;
1862                 if (tx_ring->buffer_info[eop].time_stamp &&
1863                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1864                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1865                         IXGB_STATUS_TXOFF)) {
1866                         /* detected Tx unit hang */
1867                         netif_err(adapter, drv, adapter->netdev,
1868                                   "Detected Tx Unit Hang\n"
1869                                   "  TDH                  <%x>\n"
1870                                   "  TDT                  <%x>\n"
1871                                   "  next_to_use          <%x>\n"
1872                                   "  next_to_clean        <%x>\n"
1873                                   "buffer_info[next_to_clean]\n"
1874                                   "  time_stamp           <%lx>\n"
1875                                   "  next_to_watch        <%x>\n"
1876                                   "  jiffies              <%lx>\n"
1877                                   "  next_to_watch.status <%x>\n",
1878                                   IXGB_READ_REG(&adapter->hw, TDH),
1879                                   IXGB_READ_REG(&adapter->hw, TDT),
1880                                   tx_ring->next_to_use,
1881                                   tx_ring->next_to_clean,
1882                                   tx_ring->buffer_info[eop].time_stamp,
1883                                   eop,
1884                                   jiffies,
1885                                   eop_desc->status);
1886                         netif_stop_queue(netdev);
1887                 }
1888         }
1889
1890         return cleaned;
1891 }
1892
1893 /**
1894  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1895  * @adapter: board private structure
1896  * @rx_desc: receive descriptor
1897  * @sk_buff: socket buffer with received data
1898  **/
1899
1900 static void
1901 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1902                  struct ixgb_rx_desc *rx_desc,
1903                  struct sk_buff *skb)
1904 {
1905         /* Ignore Checksum bit is set OR
1906          * TCP Checksum has not been calculated
1907          */
1908         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1909            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1910                 skb_checksum_none_assert(skb);
1911                 return;
1912         }
1913
1914         /* At this point we know the hardware did the TCP checksum */
1915         /* now look at the TCP checksum error bit */
1916         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1917                 /* let the stack verify checksum errors */
1918                 skb_checksum_none_assert(skb);
1919                 adapter->hw_csum_rx_error++;
1920         } else {
1921                 /* TCP checksum is good */
1922                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1923                 adapter->hw_csum_rx_good++;
1924         }
1925 }
1926
1927 /*
1928  * this should improve performance for small packets with large amounts
1929  * of reassembly being done in the stack
1930  */
1931 static void ixgb_check_copybreak(struct net_device *netdev,
1932                                  struct ixgb_buffer *buffer_info,
1933                                  u32 length, struct sk_buff **skb)
1934 {
1935         struct sk_buff *new_skb;
1936
1937         if (length > copybreak)
1938                 return;
1939
1940         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1941         if (!new_skb)
1942                 return;
1943
1944         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1945                                        (*skb)->data - NET_IP_ALIGN,
1946                                        length + NET_IP_ALIGN);
1947         /* save the skb in buffer_info as good */
1948         buffer_info->skb = *skb;
1949         *skb = new_skb;
1950 }
1951
1952 /**
1953  * ixgb_clean_rx_irq - Send received data up the network stack,
1954  * @adapter: board private structure
1955  **/
1956
1957 static bool
1958 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1959 {
1960         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1961         struct net_device *netdev = adapter->netdev;
1962         struct pci_dev *pdev = adapter->pdev;
1963         struct ixgb_rx_desc *rx_desc, *next_rxd;
1964         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1965         u32 length;
1966         unsigned int i, j;
1967         int cleaned_count = 0;
1968         bool cleaned = false;
1969
1970         i = rx_ring->next_to_clean;
1971         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1972         buffer_info = &rx_ring->buffer_info[i];
1973
1974         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1975                 struct sk_buff *skb;
1976                 u8 status;
1977
1978                 if (*work_done >= work_to_do)
1979                         break;
1980
1981                 (*work_done)++;
1982                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1983                 status = rx_desc->status;
1984                 skb = buffer_info->skb;
1985                 buffer_info->skb = NULL;
1986
1987                 prefetch(skb->data - NET_IP_ALIGN);
1988
1989                 if (++i == rx_ring->count)
1990                         i = 0;
1991                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1992                 prefetch(next_rxd);
1993
1994                 j = i + 1;
1995                 if (j == rx_ring->count)
1996                         j = 0;
1997                 next2_buffer = &rx_ring->buffer_info[j];
1998                 prefetch(next2_buffer);
1999
2000                 next_buffer = &rx_ring->buffer_info[i];
2001
2002                 cleaned = true;
2003                 cleaned_count++;
2004
2005                 dma_unmap_single(&pdev->dev,
2006                                  buffer_info->dma,
2007                                  buffer_info->length,
2008                                  DMA_FROM_DEVICE);
2009                 buffer_info->dma = 0;
2010
2011                 length = le16_to_cpu(rx_desc->length);
2012                 rx_desc->length = 0;
2013
2014                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2015
2016                         /* All receives must fit into a single buffer */
2017
2018                         IXGB_DBG("Receive packet consumed multiple buffers "
2019                                          "length<%x>\n", length);
2020
2021                         dev_kfree_skb_irq(skb);
2022                         goto rxdesc_done;
2023                 }
2024
2025                 if (unlikely(rx_desc->errors &
2026                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2027                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2028                         dev_kfree_skb_irq(skb);
2029                         goto rxdesc_done;
2030                 }
2031
2032                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2033
2034                 /* Good Receive */
2035                 skb_put(skb, length);
2036
2037                 /* Receive Checksum Offload */
2038                 ixgb_rx_checksum(adapter, rx_desc, skb);
2039
2040                 skb->protocol = eth_type_trans(skb, netdev);
2041                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2042                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2043                                                 le16_to_cpu(rx_desc->special));
2044                 } else {
2045                         netif_receive_skb(skb);
2046                 }
2047
2048 rxdesc_done:
2049                 /* clean up descriptor, might be written over by hw */
2050                 rx_desc->status = 0;
2051
2052                 /* return some buffers to hardware, one at a time is too slow */
2053                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2054                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2055                         cleaned_count = 0;
2056                 }
2057
2058                 /* use prefetched values */
2059                 rx_desc = next_rxd;
2060                 buffer_info = next_buffer;
2061         }
2062
2063         rx_ring->next_to_clean = i;
2064
2065         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2066         if (cleaned_count)
2067                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2068
2069         return cleaned;
2070 }
2071
2072 /**
2073  * ixgb_alloc_rx_buffers - Replace used receive buffers
2074  * @adapter: address of board private structure
2075  **/
2076
2077 static void
2078 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2079 {
2080         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2081         struct net_device *netdev = adapter->netdev;
2082         struct pci_dev *pdev = adapter->pdev;
2083         struct ixgb_rx_desc *rx_desc;
2084         struct ixgb_buffer *buffer_info;
2085         struct sk_buff *skb;
2086         unsigned int i;
2087         long cleancount;
2088
2089         i = rx_ring->next_to_use;
2090         buffer_info = &rx_ring->buffer_info[i];
2091         cleancount = IXGB_DESC_UNUSED(rx_ring);
2092
2093
2094         /* leave three descriptors unused */
2095         while (--cleancount > 2 && cleaned_count--) {
2096                 /* recycle! its good for you */
2097                 skb = buffer_info->skb;
2098                 if (skb) {
2099                         skb_trim(skb, 0);
2100                         goto map_skb;
2101                 }
2102
2103                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2104                 if (unlikely(!skb)) {
2105                         /* Better luck next round */
2106                         adapter->alloc_rx_buff_failed++;
2107                         break;
2108                 }
2109
2110                 buffer_info->skb = skb;
2111                 buffer_info->length = adapter->rx_buffer_len;
2112 map_skb:
2113                 buffer_info->dma = dma_map_single(&pdev->dev,
2114                                                   skb->data,
2115                                                   adapter->rx_buffer_len,
2116                                                   DMA_FROM_DEVICE);
2117
2118                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2119                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2120                 /* guarantee DD bit not set now before h/w gets descriptor
2121                  * this is the rest of the workaround for h/w double
2122                  * writeback. */
2123                 rx_desc->status = 0;
2124
2125
2126                 if (++i == rx_ring->count) i = 0;
2127                 buffer_info = &rx_ring->buffer_info[i];
2128         }
2129
2130         if (likely(rx_ring->next_to_use != i)) {
2131                 rx_ring->next_to_use = i;
2132                 if (unlikely(i-- == 0))
2133                         i = (rx_ring->count - 1);
2134
2135                 /* Force memory writes to complete before letting h/w
2136                  * know there are new descriptors to fetch.  (Only
2137                  * applicable for weak-ordered memory model archs, such
2138                  * as IA-64). */
2139                 wmb();
2140                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2141         }
2142 }
2143
2144 /**
2145  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2146  *
2147  * @param netdev network interface device structure
2148  * @param grp indicates to enable or disable tagging/stripping
2149  **/
2150 static void
2151 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2152 {
2153         struct ixgb_adapter *adapter = netdev_priv(netdev);
2154         u32 ctrl, rctl;
2155
2156         ixgb_irq_disable(adapter);
2157         adapter->vlgrp = grp;
2158
2159         if (grp) {
2160                 /* enable VLAN tag insert/strip */
2161                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2162                 ctrl |= IXGB_CTRL0_VME;
2163                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2164
2165                 /* enable VLAN receive filtering */
2166
2167                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2168                 rctl &= ~IXGB_RCTL_CFIEN;
2169                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2170         } else {
2171                 /* disable VLAN tag insert/strip */
2172
2173                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2174                 ctrl &= ~IXGB_CTRL0_VME;
2175                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2176         }
2177
2178         /* don't enable interrupts unless we are UP */
2179         if (adapter->netdev->flags & IFF_UP)
2180                 ixgb_irq_enable(adapter);
2181 }
2182
2183 static void
2184 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2185 {
2186         struct ixgb_adapter *adapter = netdev_priv(netdev);
2187         u32 vfta, index;
2188
2189         /* add VID to filter table */
2190
2191         index = (vid >> 5) & 0x7F;
2192         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2193         vfta |= (1 << (vid & 0x1F));
2194         ixgb_write_vfta(&adapter->hw, index, vfta);
2195 }
2196
2197 static void
2198 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2199 {
2200         struct ixgb_adapter *adapter = netdev_priv(netdev);
2201         u32 vfta, index;
2202
2203         ixgb_irq_disable(adapter);
2204
2205         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2206
2207         /* don't enable interrupts unless we are UP */
2208         if (adapter->netdev->flags & IFF_UP)
2209                 ixgb_irq_enable(adapter);
2210
2211         /* remove VID from filter table */
2212
2213         index = (vid >> 5) & 0x7F;
2214         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2215         vfta &= ~(1 << (vid & 0x1F));
2216         ixgb_write_vfta(&adapter->hw, index, vfta);
2217 }
2218
2219 static void
2220 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2221 {
2222         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2223
2224         if (adapter->vlgrp) {
2225                 u16 vid;
2226                 for (vid = 0; vid < VLAN_N_VID; vid++) {
2227                         if (!vlan_group_get_device(adapter->vlgrp, vid))
2228                                 continue;
2229                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2230                 }
2231         }
2232 }
2233
2234 #ifdef CONFIG_NET_POLL_CONTROLLER
2235 /*
2236  * Polling 'interrupt' - used by things like netconsole to send skbs
2237  * without having to re-enable interrupts. It's not called while
2238  * the interrupt routine is executing.
2239  */
2240
2241 static void ixgb_netpoll(struct net_device *dev)
2242 {
2243         struct ixgb_adapter *adapter = netdev_priv(dev);
2244
2245         disable_irq(adapter->pdev->irq);
2246         ixgb_intr(adapter->pdev->irq, dev);
2247         enable_irq(adapter->pdev->irq);
2248 }
2249 #endif
2250
2251 /**
2252  * ixgb_io_error_detected() - called when PCI error is detected
2253  * @pdev    pointer to pci device with error
2254  * @state   pci channel state after error
2255  *
2256  * This callback is called by the PCI subsystem whenever
2257  * a PCI bus error is detected.
2258  */
2259 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2260                                                enum pci_channel_state state)
2261 {
2262         struct net_device *netdev = pci_get_drvdata(pdev);
2263         struct ixgb_adapter *adapter = netdev_priv(netdev);
2264
2265         netif_device_detach(netdev);
2266
2267         if (state == pci_channel_io_perm_failure)
2268                 return PCI_ERS_RESULT_DISCONNECT;
2269
2270         if (netif_running(netdev))
2271                 ixgb_down(adapter, true);
2272
2273         pci_disable_device(pdev);
2274
2275         /* Request a slot reset. */
2276         return PCI_ERS_RESULT_NEED_RESET;
2277 }
2278
2279 /**
2280  * ixgb_io_slot_reset - called after the pci bus has been reset.
2281  * @pdev    pointer to pci device with error
2282  *
2283  * This callback is called after the PCI bus has been reset.
2284  * Basically, this tries to restart the card from scratch.
2285  * This is a shortened version of the device probe/discovery code,
2286  * it resembles the first-half of the ixgb_probe() routine.
2287  */
2288 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2289 {
2290         struct net_device *netdev = pci_get_drvdata(pdev);
2291         struct ixgb_adapter *adapter = netdev_priv(netdev);
2292
2293         if (pci_enable_device(pdev)) {
2294                 netif_err(adapter, probe, adapter->netdev,
2295                           "Cannot re-enable PCI device after reset\n");
2296                 return PCI_ERS_RESULT_DISCONNECT;
2297         }
2298
2299         /* Perform card reset only on one instance of the card */
2300         if (0 != PCI_FUNC (pdev->devfn))
2301                 return PCI_ERS_RESULT_RECOVERED;
2302
2303         pci_set_master(pdev);
2304
2305         netif_carrier_off(netdev);
2306         netif_stop_queue(netdev);
2307         ixgb_reset(adapter);
2308
2309         /* Make sure the EEPROM is good */
2310         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2311                 netif_err(adapter, probe, adapter->netdev,
2312                           "After reset, the EEPROM checksum is not valid\n");
2313                 return PCI_ERS_RESULT_DISCONNECT;
2314         }
2315         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2316         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2317
2318         if (!is_valid_ether_addr(netdev->perm_addr)) {
2319                 netif_err(adapter, probe, adapter->netdev,
2320                           "After reset, invalid MAC address\n");
2321                 return PCI_ERS_RESULT_DISCONNECT;
2322         }
2323
2324         return PCI_ERS_RESULT_RECOVERED;
2325 }
2326
2327 /**
2328  * ixgb_io_resume - called when its OK to resume normal operations
2329  * @pdev    pointer to pci device with error
2330  *
2331  * The error recovery driver tells us that its OK to resume
2332  * normal operation. Implementation resembles the second-half
2333  * of the ixgb_probe() routine.
2334  */
2335 static void ixgb_io_resume(struct pci_dev *pdev)
2336 {
2337         struct net_device *netdev = pci_get_drvdata(pdev);
2338         struct ixgb_adapter *adapter = netdev_priv(netdev);
2339
2340         pci_set_master(pdev);
2341
2342         if (netif_running(netdev)) {
2343                 if (ixgb_up(adapter)) {
2344                         pr_err("can't bring device back up after reset\n");
2345                         return;
2346                 }
2347         }
2348
2349         netif_device_attach(netdev);
2350         mod_timer(&adapter->watchdog_timer, jiffies);
2351 }
2352
2353 /* ixgb_main.c */