GNU Linux-libre 4.9.330-gnu1
[releases.git] / drivers / net / ethernet / intel / 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 <linux/prefetch.h>
32 #include "ixgb.h"
33
34 char ixgb_driver_name[] = "ixgb";
35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
36
37 #define DRIVERNAPI "-NAPI"
38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
39 const char ixgb_driver_version[] = DRV_VERSION;
40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
41
42 #define IXGB_CB_LENGTH 256
43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
44 module_param(copybreak, uint, 0644);
45 MODULE_PARM_DESC(copybreak,
46         "Maximum size of packet that is copied to a new buffer on receive");
47
48 /* ixgb_pci_tbl - PCI Device ID Table
49  *
50  * Wildcard entries (PCI_ANY_ID) should come last
51  * Last entry must be all 0s
52  *
53  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
54  *   Class, Class Mask, private data (not used) }
55  */
56 static const struct pci_device_id ixgb_pci_tbl[] = {
57         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
58          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
59         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
60          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
61         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
62          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
63         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
64          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
65
66         /* required last entry */
67         {0,}
68 };
69
70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
71
72 /* Local Function Prototypes */
73 static int ixgb_init_module(void);
74 static void ixgb_exit_module(void);
75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
76 static void ixgb_remove(struct pci_dev *pdev);
77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
78 static int ixgb_open(struct net_device *netdev);
79 static int ixgb_close(struct net_device *netdev);
80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
85 static void ixgb_set_multi(struct net_device *netdev);
86 static void ixgb_watchdog(unsigned long data);
87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
88                                    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 static int ixgb_clean(struct napi_struct *, int);
96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
98
99 static void ixgb_tx_timeout(struct net_device *dev);
100 static void ixgb_tx_timeout_task(struct work_struct *work);
101
102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
104 static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
105                                 __be16 proto, u16 vid);
106 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
107                                  __be16 proto, u16 vid);
108 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
109
110 #ifdef CONFIG_NET_POLL_CONTROLLER
111 /* for netdump / net console */
112 static void ixgb_netpoll(struct net_device *dev);
113 #endif
114
115 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
116                              enum pci_channel_state state);
117 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
118 static void ixgb_io_resume (struct pci_dev *pdev);
119
120 static const struct pci_error_handlers ixgb_err_handler = {
121         .error_detected = ixgb_io_error_detected,
122         .slot_reset = ixgb_io_slot_reset,
123         .resume = ixgb_io_resume,
124 };
125
126 static struct pci_driver ixgb_driver = {
127         .name     = ixgb_driver_name,
128         .id_table = ixgb_pci_tbl,
129         .probe    = ixgb_probe,
130         .remove   = ixgb_remove,
131         .err_handler = &ixgb_err_handler
132 };
133
134 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
135 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
136 MODULE_LICENSE("GPL");
137 MODULE_VERSION(DRV_VERSION);
138
139 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
140 static int debug = -1;
141 module_param(debug, int, 0);
142 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
143
144 /**
145  * ixgb_init_module - Driver Registration Routine
146  *
147  * ixgb_init_module is the first routine called when the driver is
148  * loaded. All it does is register with the PCI subsystem.
149  **/
150
151 static int __init
152 ixgb_init_module(void)
153 {
154         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
155         pr_info("%s\n", ixgb_copyright);
156
157         return pci_register_driver(&ixgb_driver);
158 }
159
160 module_init(ixgb_init_module);
161
162 /**
163  * ixgb_exit_module - Driver Exit Cleanup Routine
164  *
165  * ixgb_exit_module is called just before the driver is removed
166  * from memory.
167  **/
168
169 static void __exit
170 ixgb_exit_module(void)
171 {
172         pci_unregister_driver(&ixgb_driver);
173 }
174
175 module_exit(ixgb_exit_module);
176
177 /**
178  * ixgb_irq_disable - Mask off interrupt generation on the NIC
179  * @adapter: board private structure
180  **/
181
182 static void
183 ixgb_irq_disable(struct ixgb_adapter *adapter)
184 {
185         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
186         IXGB_WRITE_FLUSH(&adapter->hw);
187         synchronize_irq(adapter->pdev->irq);
188 }
189
190 /**
191  * ixgb_irq_enable - Enable default interrupt generation settings
192  * @adapter: board private structure
193  **/
194
195 static void
196 ixgb_irq_enable(struct ixgb_adapter *adapter)
197 {
198         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
199                   IXGB_INT_TXDW | IXGB_INT_LSC;
200         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
201                 val |= IXGB_INT_GPI0;
202         IXGB_WRITE_REG(&adapter->hw, IMS, val);
203         IXGB_WRITE_FLUSH(&adapter->hw);
204 }
205
206 int
207 ixgb_up(struct ixgb_adapter *adapter)
208 {
209         struct net_device *netdev = adapter->netdev;
210         int err, irq_flags = IRQF_SHARED;
211         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
212         struct ixgb_hw *hw = &adapter->hw;
213
214         /* hardware has been reset, we need to reload some things */
215
216         ixgb_rar_set(hw, netdev->dev_addr, 0);
217         ixgb_set_multi(netdev);
218
219         ixgb_restore_vlan(adapter);
220
221         ixgb_configure_tx(adapter);
222         ixgb_setup_rctl(adapter);
223         ixgb_configure_rx(adapter);
224         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
225
226         /* disable interrupts and get the hardware into a known state */
227         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
228
229         /* only enable MSI if bus is in PCI-X mode */
230         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
231                 err = pci_enable_msi(adapter->pdev);
232                 if (!err) {
233                         adapter->have_msi = true;
234                         irq_flags = 0;
235                 }
236                 /* proceed to try to request regular interrupt */
237         }
238
239         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
240                           netdev->name, netdev);
241         if (err) {
242                 if (adapter->have_msi)
243                         pci_disable_msi(adapter->pdev);
244                 netif_err(adapter, probe, adapter->netdev,
245                           "Unable to allocate interrupt Error: %d\n", err);
246                 return err;
247         }
248
249         if ((hw->max_frame_size != max_frame) ||
250                 (hw->max_frame_size !=
251                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
252
253                 hw->max_frame_size = max_frame;
254
255                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
256
257                 if (hw->max_frame_size >
258                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
259                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
260
261                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
262                                 ctrl0 |= IXGB_CTRL0_JFE;
263                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
264                         }
265                 }
266         }
267
268         clear_bit(__IXGB_DOWN, &adapter->flags);
269
270         napi_enable(&adapter->napi);
271         ixgb_irq_enable(adapter);
272
273         netif_wake_queue(netdev);
274
275         mod_timer(&adapter->watchdog_timer, jiffies);
276
277         return 0;
278 }
279
280 void
281 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
282 {
283         struct net_device *netdev = adapter->netdev;
284
285         /* prevent the interrupt handler from restarting watchdog */
286         set_bit(__IXGB_DOWN, &adapter->flags);
287
288         netif_carrier_off(netdev);
289
290         napi_disable(&adapter->napi);
291         /* waiting for NAPI to complete can re-enable interrupts */
292         ixgb_irq_disable(adapter);
293         free_irq(adapter->pdev->irq, netdev);
294
295         if (adapter->have_msi)
296                 pci_disable_msi(adapter->pdev);
297
298         if (kill_watchdog)
299                 del_timer_sync(&adapter->watchdog_timer);
300
301         adapter->link_speed = 0;
302         adapter->link_duplex = 0;
303         netif_stop_queue(netdev);
304
305         ixgb_reset(adapter);
306         ixgb_clean_tx_ring(adapter);
307         ixgb_clean_rx_ring(adapter);
308 }
309
310 void
311 ixgb_reset(struct ixgb_adapter *adapter)
312 {
313         struct ixgb_hw *hw = &adapter->hw;
314
315         ixgb_adapter_stop(hw);
316         if (!ixgb_init_hw(hw))
317                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
318
319         /* restore frame size information */
320         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
321         if (hw->max_frame_size >
322             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
323                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
324                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
325                         ctrl0 |= IXGB_CTRL0_JFE;
326                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
327                 }
328         }
329 }
330
331 static netdev_features_t
332 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
333 {
334         /*
335          * Tx VLAN insertion does not work per HW design when Rx stripping is
336          * disabled.
337          */
338         if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
339                 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
340
341         return features;
342 }
343
344 static int
345 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
346 {
347         struct ixgb_adapter *adapter = netdev_priv(netdev);
348         netdev_features_t changed = features ^ netdev->features;
349
350         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
351                 return 0;
352
353         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
354
355         if (netif_running(netdev)) {
356                 ixgb_down(adapter, true);
357                 ixgb_up(adapter);
358                 ixgb_set_speed_duplex(netdev);
359         } else
360                 ixgb_reset(adapter);
361
362         return 0;
363 }
364
365
366 static const struct net_device_ops ixgb_netdev_ops = {
367         .ndo_open               = ixgb_open,
368         .ndo_stop               = ixgb_close,
369         .ndo_start_xmit         = ixgb_xmit_frame,
370         .ndo_get_stats          = ixgb_get_stats,
371         .ndo_set_rx_mode        = ixgb_set_multi,
372         .ndo_validate_addr      = eth_validate_addr,
373         .ndo_set_mac_address    = ixgb_set_mac,
374         .ndo_change_mtu         = ixgb_change_mtu,
375         .ndo_tx_timeout         = ixgb_tx_timeout,
376         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
377         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
378 #ifdef CONFIG_NET_POLL_CONTROLLER
379         .ndo_poll_controller    = ixgb_netpoll,
380 #endif
381         .ndo_fix_features       = ixgb_fix_features,
382         .ndo_set_features       = ixgb_set_features,
383 };
384
385 /**
386  * ixgb_probe - Device Initialization Routine
387  * @pdev: PCI device information struct
388  * @ent: entry in ixgb_pci_tbl
389  *
390  * Returns 0 on success, negative on failure
391  *
392  * ixgb_probe initializes an adapter identified by a pci_dev structure.
393  * The OS initialization, configuring of the adapter private structure,
394  * and a hardware reset occur.
395  **/
396
397 static int
398 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
399 {
400         struct net_device *netdev = NULL;
401         struct ixgb_adapter *adapter;
402         static int cards_found = 0;
403         int pci_using_dac;
404         int i;
405         int err;
406
407         err = pci_enable_device(pdev);
408         if (err)
409                 return err;
410
411         pci_using_dac = 0;
412         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
413         if (!err) {
414                 pci_using_dac = 1;
415         } else {
416                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
417                 if (err) {
418                         pr_err("No usable DMA configuration, aborting\n");
419                         goto err_dma_mask;
420                 }
421         }
422
423         err = pci_request_regions(pdev, ixgb_driver_name);
424         if (err)
425                 goto err_request_regions;
426
427         pci_set_master(pdev);
428
429         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
430         if (!netdev) {
431                 err = -ENOMEM;
432                 goto err_alloc_etherdev;
433         }
434
435         SET_NETDEV_DEV(netdev, &pdev->dev);
436
437         pci_set_drvdata(pdev, netdev);
438         adapter = netdev_priv(netdev);
439         adapter->netdev = netdev;
440         adapter->pdev = pdev;
441         adapter->hw.back = adapter;
442         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
443
444         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
445         if (!adapter->hw.hw_addr) {
446                 err = -EIO;
447                 goto err_ioremap;
448         }
449
450         for (i = BAR_1; i <= BAR_5; i++) {
451                 if (pci_resource_len(pdev, i) == 0)
452                         continue;
453                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
454                         adapter->hw.io_base = pci_resource_start(pdev, i);
455                         break;
456                 }
457         }
458
459         netdev->netdev_ops = &ixgb_netdev_ops;
460         ixgb_set_ethtool_ops(netdev);
461         netdev->watchdog_timeo = 5 * HZ;
462         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
463
464         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
465
466         adapter->bd_number = cards_found;
467         adapter->link_speed = 0;
468         adapter->link_duplex = 0;
469
470         /* setup the private structure */
471
472         err = ixgb_sw_init(adapter);
473         if (err)
474                 goto err_sw_init;
475
476         netdev->hw_features = NETIF_F_SG |
477                            NETIF_F_TSO |
478                            NETIF_F_HW_CSUM |
479                            NETIF_F_HW_VLAN_CTAG_TX |
480                            NETIF_F_HW_VLAN_CTAG_RX;
481         netdev->features = netdev->hw_features |
482                            NETIF_F_HW_VLAN_CTAG_FILTER;
483         netdev->hw_features |= NETIF_F_RXCSUM;
484
485         if (pci_using_dac) {
486                 netdev->features |= NETIF_F_HIGHDMA;
487                 netdev->vlan_features |= NETIF_F_HIGHDMA;
488         }
489
490         /* make sure the EEPROM is good */
491
492         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
493                 netif_err(adapter, probe, adapter->netdev,
494                           "The EEPROM Checksum Is Not Valid\n");
495                 err = -EIO;
496                 goto err_eeprom;
497         }
498
499         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
500
501         if (!is_valid_ether_addr(netdev->dev_addr)) {
502                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
503                 err = -EIO;
504                 goto err_eeprom;
505         }
506
507         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
508
509         init_timer(&adapter->watchdog_timer);
510         adapter->watchdog_timer.function = ixgb_watchdog;
511         adapter->watchdog_timer.data = (unsigned long)adapter;
512
513         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
514
515         strcpy(netdev->name, "eth%d");
516         err = register_netdev(netdev);
517         if (err)
518                 goto err_register;
519
520         /* carrier off reporting is important to ethtool even BEFORE open */
521         netif_carrier_off(netdev);
522
523         netif_info(adapter, probe, adapter->netdev,
524                    "Intel(R) PRO/10GbE Network Connection\n");
525         ixgb_check_options(adapter);
526         /* reset the hardware with the new settings */
527
528         ixgb_reset(adapter);
529
530         cards_found++;
531         return 0;
532
533 err_register:
534 err_sw_init:
535 err_eeprom:
536         iounmap(adapter->hw.hw_addr);
537 err_ioremap:
538         free_netdev(netdev);
539 err_alloc_etherdev:
540         pci_release_regions(pdev);
541 err_request_regions:
542 err_dma_mask:
543         pci_disable_device(pdev);
544         return err;
545 }
546
547 /**
548  * ixgb_remove - Device Removal Routine
549  * @pdev: PCI device information struct
550  *
551  * ixgb_remove is called by the PCI subsystem to alert the driver
552  * that it should release a PCI device.  The could be caused by a
553  * Hot-Plug event, or because the driver is going to be removed from
554  * memory.
555  **/
556
557 static void
558 ixgb_remove(struct pci_dev *pdev)
559 {
560         struct net_device *netdev = pci_get_drvdata(pdev);
561         struct ixgb_adapter *adapter = netdev_priv(netdev);
562
563         cancel_work_sync(&adapter->tx_timeout_task);
564
565         unregister_netdev(netdev);
566
567         iounmap(adapter->hw.hw_addr);
568         pci_release_regions(pdev);
569
570         free_netdev(netdev);
571         pci_disable_device(pdev);
572 }
573
574 /**
575  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
576  * @adapter: board private structure to initialize
577  *
578  * ixgb_sw_init initializes the Adapter private data structure.
579  * Fields are initialized based on PCI device information and
580  * OS network device settings (MTU size).
581  **/
582
583 static int
584 ixgb_sw_init(struct ixgb_adapter *adapter)
585 {
586         struct ixgb_hw *hw = &adapter->hw;
587         struct net_device *netdev = adapter->netdev;
588         struct pci_dev *pdev = adapter->pdev;
589
590         /* PCI config space info */
591
592         hw->vendor_id = pdev->vendor;
593         hw->device_id = pdev->device;
594         hw->subsystem_vendor_id = pdev->subsystem_vendor;
595         hw->subsystem_id = pdev->subsystem_device;
596
597         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
598         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
599
600         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
601             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
602             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
603             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
604                 hw->mac_type = ixgb_82597;
605         else {
606                 /* should never have loaded on this device */
607                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
608         }
609
610         /* enable flow control to be programmed */
611         hw->fc.send_xon = 1;
612
613         set_bit(__IXGB_DOWN, &adapter->flags);
614         return 0;
615 }
616
617 /**
618  * ixgb_open - Called when a network interface is made active
619  * @netdev: network interface device structure
620  *
621  * Returns 0 on success, negative value on failure
622  *
623  * The open entry point is called when a network interface is made
624  * active by the system (IFF_UP).  At this point all resources needed
625  * for transmit and receive operations are allocated, the interrupt
626  * handler is registered with the OS, the watchdog timer is started,
627  * and the stack is notified that the interface is ready.
628  **/
629
630 static int
631 ixgb_open(struct net_device *netdev)
632 {
633         struct ixgb_adapter *adapter = netdev_priv(netdev);
634         int err;
635
636         /* allocate transmit descriptors */
637         err = ixgb_setup_tx_resources(adapter);
638         if (err)
639                 goto err_setup_tx;
640
641         netif_carrier_off(netdev);
642
643         /* allocate receive descriptors */
644
645         err = ixgb_setup_rx_resources(adapter);
646         if (err)
647                 goto err_setup_rx;
648
649         err = ixgb_up(adapter);
650         if (err)
651                 goto err_up;
652
653         netif_start_queue(netdev);
654
655         return 0;
656
657 err_up:
658         ixgb_free_rx_resources(adapter);
659 err_setup_rx:
660         ixgb_free_tx_resources(adapter);
661 err_setup_tx:
662         ixgb_reset(adapter);
663
664         return err;
665 }
666
667 /**
668  * ixgb_close - Disables a network interface
669  * @netdev: network interface device structure
670  *
671  * Returns 0, this is not allowed to fail
672  *
673  * The close entry point is called when an interface is de-activated
674  * by the OS.  The hardware is still under the drivers control, but
675  * needs to be disabled.  A global MAC reset is issued to stop the
676  * hardware, and all transmit and receive resources are freed.
677  **/
678
679 static int
680 ixgb_close(struct net_device *netdev)
681 {
682         struct ixgb_adapter *adapter = netdev_priv(netdev);
683
684         ixgb_down(adapter, true);
685
686         ixgb_free_tx_resources(adapter);
687         ixgb_free_rx_resources(adapter);
688
689         return 0;
690 }
691
692 /**
693  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
694  * @adapter: board private structure
695  *
696  * Return 0 on success, negative on failure
697  **/
698
699 int
700 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
701 {
702         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
703         struct pci_dev *pdev = adapter->pdev;
704         int size;
705
706         size = sizeof(struct ixgb_buffer) * txdr->count;
707         txdr->buffer_info = vzalloc(size);
708         if (!txdr->buffer_info)
709                 return -ENOMEM;
710
711         /* round up to nearest 4K */
712
713         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
714         txdr->size = ALIGN(txdr->size, 4096);
715
716         txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
717                                          GFP_KERNEL);
718         if (!txdr->desc) {
719                 vfree(txdr->buffer_info);
720                 return -ENOMEM;
721         }
722
723         txdr->next_to_use = 0;
724         txdr->next_to_clean = 0;
725
726         return 0;
727 }
728
729 /**
730  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
731  * @adapter: board private structure
732  *
733  * Configure the Tx unit of the MAC after a reset.
734  **/
735
736 static void
737 ixgb_configure_tx(struct ixgb_adapter *adapter)
738 {
739         u64 tdba = adapter->tx_ring.dma;
740         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
741         u32 tctl;
742         struct ixgb_hw *hw = &adapter->hw;
743
744         /* Setup the Base and Length of the Tx Descriptor Ring
745          * tx_ring.dma can be either a 32 or 64 bit value
746          */
747
748         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
749         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
750
751         IXGB_WRITE_REG(hw, TDLEN, tdlen);
752
753         /* Setup the HW Tx Head and Tail descriptor pointers */
754
755         IXGB_WRITE_REG(hw, TDH, 0);
756         IXGB_WRITE_REG(hw, TDT, 0);
757
758         /* don't set up txdctl, it induces performance problems if configured
759          * incorrectly */
760         /* Set the Tx Interrupt Delay register */
761
762         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
763
764         /* Program the Transmit Control Register */
765
766         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
767         IXGB_WRITE_REG(hw, TCTL, tctl);
768
769         /* Setup Transmit Descriptor Settings for this adapter */
770         adapter->tx_cmd_type =
771                 IXGB_TX_DESC_TYPE |
772                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
773 }
774
775 /**
776  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
777  * @adapter: board private structure
778  *
779  * Returns 0 on success, negative on failure
780  **/
781
782 int
783 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
784 {
785         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
786         struct pci_dev *pdev = adapter->pdev;
787         int size;
788
789         size = sizeof(struct ixgb_buffer) * rxdr->count;
790         rxdr->buffer_info = vzalloc(size);
791         if (!rxdr->buffer_info)
792                 return -ENOMEM;
793
794         /* Round up to nearest 4K */
795
796         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
797         rxdr->size = ALIGN(rxdr->size, 4096);
798
799         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
800                                         GFP_KERNEL);
801
802         if (!rxdr->desc) {
803                 vfree(rxdr->buffer_info);
804                 return -ENOMEM;
805         }
806         memset(rxdr->desc, 0, rxdr->size);
807
808         rxdr->next_to_clean = 0;
809         rxdr->next_to_use = 0;
810
811         return 0;
812 }
813
814 /**
815  * ixgb_setup_rctl - configure the receive control register
816  * @adapter: Board private structure
817  **/
818
819 static void
820 ixgb_setup_rctl(struct ixgb_adapter *adapter)
821 {
822         u32 rctl;
823
824         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
825
826         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
827
828         rctl |=
829                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
830                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
831                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
832
833         rctl |= IXGB_RCTL_SECRC;
834
835         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
836                 rctl |= IXGB_RCTL_BSIZE_2048;
837         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
838                 rctl |= IXGB_RCTL_BSIZE_4096;
839         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
840                 rctl |= IXGB_RCTL_BSIZE_8192;
841         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
842                 rctl |= IXGB_RCTL_BSIZE_16384;
843
844         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
845 }
846
847 /**
848  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
849  * @adapter: board private structure
850  *
851  * Configure the Rx unit of the MAC after a reset.
852  **/
853
854 static void
855 ixgb_configure_rx(struct ixgb_adapter *adapter)
856 {
857         u64 rdba = adapter->rx_ring.dma;
858         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
859         struct ixgb_hw *hw = &adapter->hw;
860         u32 rctl;
861         u32 rxcsum;
862
863         /* make sure receives are disabled while setting up the descriptors */
864
865         rctl = IXGB_READ_REG(hw, RCTL);
866         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
867
868         /* set the Receive Delay Timer Register */
869
870         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
871
872         /* Setup the Base and Length of the Rx Descriptor Ring */
873
874         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
875         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
876
877         IXGB_WRITE_REG(hw, RDLEN, rdlen);
878
879         /* Setup the HW Rx Head and Tail Descriptor Pointers */
880         IXGB_WRITE_REG(hw, RDH, 0);
881         IXGB_WRITE_REG(hw, RDT, 0);
882
883         /* due to the hardware errata with RXDCTL, we are unable to use any of
884          * the performance enhancing features of it without causing other
885          * subtle bugs, some of the bugs could include receive length
886          * corruption at high data rates (WTHRESH > 0) and/or receive
887          * descriptor ring irregularites (particularly in hardware cache) */
888         IXGB_WRITE_REG(hw, RXDCTL, 0);
889
890         /* Enable Receive Checksum Offload for TCP and UDP */
891         if (adapter->rx_csum) {
892                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
893                 rxcsum |= IXGB_RXCSUM_TUOFL;
894                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
895         }
896
897         /* Enable Receives */
898
899         IXGB_WRITE_REG(hw, RCTL, rctl);
900 }
901
902 /**
903  * ixgb_free_tx_resources - Free Tx Resources
904  * @adapter: board private structure
905  *
906  * Free all transmit software resources
907  **/
908
909 void
910 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
911 {
912         struct pci_dev *pdev = adapter->pdev;
913
914         ixgb_clean_tx_ring(adapter);
915
916         vfree(adapter->tx_ring.buffer_info);
917         adapter->tx_ring.buffer_info = NULL;
918
919         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
920                           adapter->tx_ring.desc, adapter->tx_ring.dma);
921
922         adapter->tx_ring.desc = NULL;
923 }
924
925 static void
926 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
927                                 struct ixgb_buffer *buffer_info)
928 {
929         if (buffer_info->dma) {
930                 if (buffer_info->mapped_as_page)
931                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
932                                        buffer_info->length, DMA_TO_DEVICE);
933                 else
934                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
935                                          buffer_info->length, DMA_TO_DEVICE);
936                 buffer_info->dma = 0;
937         }
938
939         if (buffer_info->skb) {
940                 dev_kfree_skb_any(buffer_info->skb);
941                 buffer_info->skb = NULL;
942         }
943         buffer_info->time_stamp = 0;
944         /* these fields must always be initialized in tx
945          * buffer_info->length = 0;
946          * buffer_info->next_to_watch = 0; */
947 }
948
949 /**
950  * ixgb_clean_tx_ring - Free Tx Buffers
951  * @adapter: board private structure
952  **/
953
954 static void
955 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
956 {
957         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
958         struct ixgb_buffer *buffer_info;
959         unsigned long size;
960         unsigned int i;
961
962         /* Free all the Tx ring sk_buffs */
963
964         for (i = 0; i < tx_ring->count; i++) {
965                 buffer_info = &tx_ring->buffer_info[i];
966                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
967         }
968
969         size = sizeof(struct ixgb_buffer) * tx_ring->count;
970         memset(tx_ring->buffer_info, 0, size);
971
972         /* Zero out the descriptor ring */
973
974         memset(tx_ring->desc, 0, tx_ring->size);
975
976         tx_ring->next_to_use = 0;
977         tx_ring->next_to_clean = 0;
978
979         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
980         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
981 }
982
983 /**
984  * ixgb_free_rx_resources - Free Rx Resources
985  * @adapter: board private structure
986  *
987  * Free all receive software resources
988  **/
989
990 void
991 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
992 {
993         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
994         struct pci_dev *pdev = adapter->pdev;
995
996         ixgb_clean_rx_ring(adapter);
997
998         vfree(rx_ring->buffer_info);
999         rx_ring->buffer_info = NULL;
1000
1001         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1002                           rx_ring->dma);
1003
1004         rx_ring->desc = NULL;
1005 }
1006
1007 /**
1008  * ixgb_clean_rx_ring - Free Rx Buffers
1009  * @adapter: board private structure
1010  **/
1011
1012 static void
1013 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1014 {
1015         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1016         struct ixgb_buffer *buffer_info;
1017         struct pci_dev *pdev = adapter->pdev;
1018         unsigned long size;
1019         unsigned int i;
1020
1021         /* Free all the Rx ring sk_buffs */
1022
1023         for (i = 0; i < rx_ring->count; i++) {
1024                 buffer_info = &rx_ring->buffer_info[i];
1025                 if (buffer_info->dma) {
1026                         dma_unmap_single(&pdev->dev,
1027                                          buffer_info->dma,
1028                                          buffer_info->length,
1029                                          DMA_FROM_DEVICE);
1030                         buffer_info->dma = 0;
1031                         buffer_info->length = 0;
1032                 }
1033
1034                 if (buffer_info->skb) {
1035                         dev_kfree_skb(buffer_info->skb);
1036                         buffer_info->skb = NULL;
1037                 }
1038         }
1039
1040         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1041         memset(rx_ring->buffer_info, 0, size);
1042
1043         /* Zero out the descriptor ring */
1044
1045         memset(rx_ring->desc, 0, rx_ring->size);
1046
1047         rx_ring->next_to_clean = 0;
1048         rx_ring->next_to_use = 0;
1049
1050         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1051         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1052 }
1053
1054 /**
1055  * ixgb_set_mac - Change the Ethernet Address of the NIC
1056  * @netdev: network interface device structure
1057  * @p: pointer to an address structure
1058  *
1059  * Returns 0 on success, negative on failure
1060  **/
1061
1062 static int
1063 ixgb_set_mac(struct net_device *netdev, void *p)
1064 {
1065         struct ixgb_adapter *adapter = netdev_priv(netdev);
1066         struct sockaddr *addr = p;
1067
1068         if (!is_valid_ether_addr(addr->sa_data))
1069                 return -EADDRNOTAVAIL;
1070
1071         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1072
1073         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1074
1075         return 0;
1076 }
1077
1078 /**
1079  * ixgb_set_multi - Multicast and Promiscuous mode set
1080  * @netdev: network interface device structure
1081  *
1082  * The set_multi entry point is called whenever the multicast address
1083  * list or the network interface flags are updated.  This routine is
1084  * responsible for configuring the hardware for proper multicast,
1085  * promiscuous mode, and all-multi behavior.
1086  **/
1087
1088 static void
1089 ixgb_set_multi(struct net_device *netdev)
1090 {
1091         struct ixgb_adapter *adapter = netdev_priv(netdev);
1092         struct ixgb_hw *hw = &adapter->hw;
1093         struct netdev_hw_addr *ha;
1094         u32 rctl;
1095
1096         /* Check for Promiscuous and All Multicast modes */
1097
1098         rctl = IXGB_READ_REG(hw, RCTL);
1099
1100         if (netdev->flags & IFF_PROMISC) {
1101                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1102                 /* disable VLAN filtering */
1103                 rctl &= ~IXGB_RCTL_CFIEN;
1104                 rctl &= ~IXGB_RCTL_VFE;
1105         } else {
1106                 if (netdev->flags & IFF_ALLMULTI) {
1107                         rctl |= IXGB_RCTL_MPE;
1108                         rctl &= ~IXGB_RCTL_UPE;
1109                 } else {
1110                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1111                 }
1112                 /* enable VLAN filtering */
1113                 rctl |= IXGB_RCTL_VFE;
1114                 rctl &= ~IXGB_RCTL_CFIEN;
1115         }
1116
1117         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1118                 rctl |= IXGB_RCTL_MPE;
1119                 IXGB_WRITE_REG(hw, RCTL, rctl);
1120         } else {
1121                 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1122                               ETH_ALEN, GFP_ATOMIC);
1123                 u8 *addr;
1124                 if (!mta)
1125                         goto alloc_failed;
1126
1127                 IXGB_WRITE_REG(hw, RCTL, rctl);
1128
1129                 addr = mta;
1130                 netdev_for_each_mc_addr(ha, netdev) {
1131                         memcpy(addr, ha->addr, ETH_ALEN);
1132                         addr += ETH_ALEN;
1133                 }
1134
1135                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1136                 kfree(mta);
1137         }
1138
1139 alloc_failed:
1140         if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1141                 ixgb_vlan_strip_enable(adapter);
1142         else
1143                 ixgb_vlan_strip_disable(adapter);
1144
1145 }
1146
1147 /**
1148  * ixgb_watchdog - Timer Call-back
1149  * @data: pointer to netdev cast into an unsigned long
1150  **/
1151
1152 static void
1153 ixgb_watchdog(unsigned long data)
1154 {
1155         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1156         struct net_device *netdev = adapter->netdev;
1157         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1158
1159         ixgb_check_for_link(&adapter->hw);
1160
1161         if (ixgb_check_for_bad_link(&adapter->hw)) {
1162                 /* force the reset path */
1163                 netif_stop_queue(netdev);
1164         }
1165
1166         if (adapter->hw.link_up) {
1167                 if (!netif_carrier_ok(netdev)) {
1168                         netdev_info(netdev,
1169                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1170                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1171                                     "RX/TX" :
1172                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1173                                      "RX" :
1174                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1175                                     "TX" : "None");
1176                         adapter->link_speed = 10000;
1177                         adapter->link_duplex = FULL_DUPLEX;
1178                         netif_carrier_on(netdev);
1179                 }
1180         } else {
1181                 if (netif_carrier_ok(netdev)) {
1182                         adapter->link_speed = 0;
1183                         adapter->link_duplex = 0;
1184                         netdev_info(netdev, "NIC Link is Down\n");
1185                         netif_carrier_off(netdev);
1186                 }
1187         }
1188
1189         ixgb_update_stats(adapter);
1190
1191         if (!netif_carrier_ok(netdev)) {
1192                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1193                         /* We've lost link, so the controller stops DMA,
1194                          * but we've got queued Tx work that's never going
1195                          * to get done, so reset controller to flush Tx.
1196                          * (Do the reset outside of interrupt context). */
1197                         schedule_work(&adapter->tx_timeout_task);
1198                         /* return immediately since reset is imminent */
1199                         return;
1200                 }
1201         }
1202
1203         /* Force detection of hung controller every watchdog period */
1204         adapter->detect_tx_hung = true;
1205
1206         /* generate an interrupt to force clean up of any stragglers */
1207         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1208
1209         /* Reset the timer */
1210         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1211 }
1212
1213 #define IXGB_TX_FLAGS_CSUM              0x00000001
1214 #define IXGB_TX_FLAGS_VLAN              0x00000002
1215 #define IXGB_TX_FLAGS_TSO               0x00000004
1216
1217 static int
1218 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1219 {
1220         struct ixgb_context_desc *context_desc;
1221         unsigned int i;
1222         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1223         u16 ipcse, tucse, mss;
1224
1225         if (likely(skb_is_gso(skb))) {
1226                 struct ixgb_buffer *buffer_info;
1227                 struct iphdr *iph;
1228                 int err;
1229
1230                 err = skb_cow_head(skb, 0);
1231                 if (err < 0)
1232                         return err;
1233
1234                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1235                 mss = skb_shinfo(skb)->gso_size;
1236                 iph = ip_hdr(skb);
1237                 iph->tot_len = 0;
1238                 iph->check = 0;
1239                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1240                                                          iph->daddr, 0,
1241                                                          IPPROTO_TCP, 0);
1242                 ipcss = skb_network_offset(skb);
1243                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1244                 ipcse = skb_transport_offset(skb) - 1;
1245                 tucss = skb_transport_offset(skb);
1246                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1247                 tucse = 0;
1248
1249                 i = adapter->tx_ring.next_to_use;
1250                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1251                 buffer_info = &adapter->tx_ring.buffer_info[i];
1252                 WARN_ON(buffer_info->dma != 0);
1253
1254                 context_desc->ipcss = ipcss;
1255                 context_desc->ipcso = ipcso;
1256                 context_desc->ipcse = cpu_to_le16(ipcse);
1257                 context_desc->tucss = tucss;
1258                 context_desc->tucso = tucso;
1259                 context_desc->tucse = cpu_to_le16(tucse);
1260                 context_desc->mss = cpu_to_le16(mss);
1261                 context_desc->hdr_len = hdr_len;
1262                 context_desc->status = 0;
1263                 context_desc->cmd_type_len = cpu_to_le32(
1264                                                   IXGB_CONTEXT_DESC_TYPE
1265                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1266                                                 | IXGB_CONTEXT_DESC_CMD_IP
1267                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1268                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1269                                                 | (skb->len - (hdr_len)));
1270
1271
1272                 if (++i == adapter->tx_ring.count) i = 0;
1273                 adapter->tx_ring.next_to_use = i;
1274
1275                 return 1;
1276         }
1277
1278         return 0;
1279 }
1280
1281 static bool
1282 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1283 {
1284         struct ixgb_context_desc *context_desc;
1285         unsigned int i;
1286         u8 css, cso;
1287
1288         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1289                 struct ixgb_buffer *buffer_info;
1290                 css = skb_checksum_start_offset(skb);
1291                 cso = css + skb->csum_offset;
1292
1293                 i = adapter->tx_ring.next_to_use;
1294                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1295                 buffer_info = &adapter->tx_ring.buffer_info[i];
1296                 WARN_ON(buffer_info->dma != 0);
1297
1298                 context_desc->tucss = css;
1299                 context_desc->tucso = cso;
1300                 context_desc->tucse = 0;
1301                 /* zero out any previously existing data in one instruction */
1302                 *(u32 *)&(context_desc->ipcss) = 0;
1303                 context_desc->status = 0;
1304                 context_desc->hdr_len = 0;
1305                 context_desc->mss = 0;
1306                 context_desc->cmd_type_len =
1307                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1308                                     | IXGB_TX_DESC_CMD_IDE);
1309
1310                 if (++i == adapter->tx_ring.count) i = 0;
1311                 adapter->tx_ring.next_to_use = i;
1312
1313                 return true;
1314         }
1315
1316         return false;
1317 }
1318
1319 #define IXGB_MAX_TXD_PWR        14
1320 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1321
1322 static int
1323 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1324             unsigned int first)
1325 {
1326         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1327         struct pci_dev *pdev = adapter->pdev;
1328         struct ixgb_buffer *buffer_info;
1329         int len = skb_headlen(skb);
1330         unsigned int offset = 0, size, count = 0, i;
1331         unsigned int mss = skb_shinfo(skb)->gso_size;
1332         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1333         unsigned int f;
1334
1335         i = tx_ring->next_to_use;
1336
1337         while (len) {
1338                 buffer_info = &tx_ring->buffer_info[i];
1339                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1340                 /* Workaround for premature desc write-backs
1341                  * in TSO mode.  Append 4-byte sentinel desc */
1342                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1343                         size -= 4;
1344
1345                 buffer_info->length = size;
1346                 WARN_ON(buffer_info->dma != 0);
1347                 buffer_info->time_stamp = jiffies;
1348                 buffer_info->mapped_as_page = false;
1349                 buffer_info->dma = dma_map_single(&pdev->dev,
1350                                                   skb->data + offset,
1351                                                   size, DMA_TO_DEVICE);
1352                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1353                         goto dma_error;
1354                 buffer_info->next_to_watch = 0;
1355
1356                 len -= size;
1357                 offset += size;
1358                 count++;
1359                 if (len) {
1360                         i++;
1361                         if (i == tx_ring->count)
1362                                 i = 0;
1363                 }
1364         }
1365
1366         for (f = 0; f < nr_frags; f++) {
1367                 const struct skb_frag_struct *frag;
1368
1369                 frag = &skb_shinfo(skb)->frags[f];
1370                 len = skb_frag_size(frag);
1371                 offset = 0;
1372
1373                 while (len) {
1374                         i++;
1375                         if (i == tx_ring->count)
1376                                 i = 0;
1377
1378                         buffer_info = &tx_ring->buffer_info[i];
1379                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1380
1381                         /* Workaround for premature desc write-backs
1382                          * in TSO mode.  Append 4-byte sentinel desc */
1383                         if (unlikely(mss && (f == (nr_frags - 1))
1384                                      && size == len && size > 8))
1385                                 size -= 4;
1386
1387                         buffer_info->length = size;
1388                         buffer_info->time_stamp = jiffies;
1389                         buffer_info->mapped_as_page = true;
1390                         buffer_info->dma =
1391                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1392                                                  DMA_TO_DEVICE);
1393                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1394                                 goto dma_error;
1395                         buffer_info->next_to_watch = 0;
1396
1397                         len -= size;
1398                         offset += size;
1399                         count++;
1400                 }
1401         }
1402         tx_ring->buffer_info[i].skb = skb;
1403         tx_ring->buffer_info[first].next_to_watch = i;
1404
1405         return count;
1406
1407 dma_error:
1408         dev_err(&pdev->dev, "TX DMA map failed\n");
1409         buffer_info->dma = 0;
1410         if (count)
1411                 count--;
1412
1413         while (count--) {
1414                 if (i==0)
1415                         i += tx_ring->count;
1416                 i--;
1417                 buffer_info = &tx_ring->buffer_info[i];
1418                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1419         }
1420
1421         return 0;
1422 }
1423
1424 static void
1425 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1426 {
1427         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1428         struct ixgb_tx_desc *tx_desc = NULL;
1429         struct ixgb_buffer *buffer_info;
1430         u32 cmd_type_len = adapter->tx_cmd_type;
1431         u8 status = 0;
1432         u8 popts = 0;
1433         unsigned int i;
1434
1435         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1436                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1437                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1438         }
1439
1440         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1441                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1442
1443         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1444                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1445
1446         i = tx_ring->next_to_use;
1447
1448         while (count--) {
1449                 buffer_info = &tx_ring->buffer_info[i];
1450                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1451                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1452                 tx_desc->cmd_type_len =
1453                         cpu_to_le32(cmd_type_len | buffer_info->length);
1454                 tx_desc->status = status;
1455                 tx_desc->popts = popts;
1456                 tx_desc->vlan = cpu_to_le16(vlan_id);
1457
1458                 if (++i == tx_ring->count) i = 0;
1459         }
1460
1461         tx_desc->cmd_type_len |=
1462                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1463
1464         /* Force memory writes to complete before letting h/w
1465          * know there are new descriptors to fetch.  (Only
1466          * applicable for weak-ordered memory model archs,
1467          * such as IA-64). */
1468         wmb();
1469
1470         tx_ring->next_to_use = i;
1471         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1472 }
1473
1474 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1475 {
1476         struct ixgb_adapter *adapter = netdev_priv(netdev);
1477         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1478
1479         netif_stop_queue(netdev);
1480         /* Herbert's original patch had:
1481          *  smp_mb__after_netif_stop_queue();
1482          * but since that doesn't exist yet, just open code it. */
1483         smp_mb();
1484
1485         /* We need to check again in a case another CPU has just
1486          * made room available. */
1487         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1488                 return -EBUSY;
1489
1490         /* A reprieve! */
1491         netif_start_queue(netdev);
1492         ++adapter->restart_queue;
1493         return 0;
1494 }
1495
1496 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1497                               struct ixgb_desc_ring *tx_ring, int size)
1498 {
1499         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1500                 return 0;
1501         return __ixgb_maybe_stop_tx(netdev, size);
1502 }
1503
1504
1505 /* Tx Descriptors needed, worst case */
1506 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1507                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1508 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1509         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1510         + 1 /* one more needed for sentinel TSO workaround */
1511
1512 static netdev_tx_t
1513 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1514 {
1515         struct ixgb_adapter *adapter = netdev_priv(netdev);
1516         unsigned int first;
1517         unsigned int tx_flags = 0;
1518         int vlan_id = 0;
1519         int count = 0;
1520         int tso;
1521
1522         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1523                 dev_kfree_skb_any(skb);
1524                 return NETDEV_TX_OK;
1525         }
1526
1527         if (skb->len <= 0) {
1528                 dev_kfree_skb_any(skb);
1529                 return NETDEV_TX_OK;
1530         }
1531
1532         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1533                      DESC_NEEDED)))
1534                 return NETDEV_TX_BUSY;
1535
1536         if (skb_vlan_tag_present(skb)) {
1537                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1538                 vlan_id = skb_vlan_tag_get(skb);
1539         }
1540
1541         first = adapter->tx_ring.next_to_use;
1542
1543         tso = ixgb_tso(adapter, skb);
1544         if (tso < 0) {
1545                 dev_kfree_skb_any(skb);
1546                 return NETDEV_TX_OK;
1547         }
1548
1549         if (likely(tso))
1550                 tx_flags |= IXGB_TX_FLAGS_TSO;
1551         else if (ixgb_tx_csum(adapter, skb))
1552                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1553
1554         count = ixgb_tx_map(adapter, skb, first);
1555
1556         if (count) {
1557                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1558                 /* Make sure there is space in the ring for the next send. */
1559                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1560
1561         } else {
1562                 dev_kfree_skb_any(skb);
1563                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1564                 adapter->tx_ring.next_to_use = first;
1565         }
1566
1567         return NETDEV_TX_OK;
1568 }
1569
1570 /**
1571  * ixgb_tx_timeout - Respond to a Tx Hang
1572  * @netdev: network interface device structure
1573  **/
1574
1575 static void
1576 ixgb_tx_timeout(struct net_device *netdev)
1577 {
1578         struct ixgb_adapter *adapter = netdev_priv(netdev);
1579
1580         /* Do the reset outside of interrupt context */
1581         schedule_work(&adapter->tx_timeout_task);
1582 }
1583
1584 static void
1585 ixgb_tx_timeout_task(struct work_struct *work)
1586 {
1587         struct ixgb_adapter *adapter =
1588                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1589
1590         adapter->tx_timeout_count++;
1591         ixgb_down(adapter, true);
1592         ixgb_up(adapter);
1593 }
1594
1595 /**
1596  * ixgb_get_stats - Get System Network Statistics
1597  * @netdev: network interface device structure
1598  *
1599  * Returns the address of the device statistics structure.
1600  * The statistics are actually updated from the timer callback.
1601  **/
1602
1603 static struct net_device_stats *
1604 ixgb_get_stats(struct net_device *netdev)
1605 {
1606         return &netdev->stats;
1607 }
1608
1609 /**
1610  * ixgb_change_mtu - Change the Maximum Transfer Unit
1611  * @netdev: network interface device structure
1612  * @new_mtu: new value for maximum frame size
1613  *
1614  * Returns 0 on success, negative on failure
1615  **/
1616
1617 static int
1618 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1619 {
1620         struct ixgb_adapter *adapter = netdev_priv(netdev);
1621         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1622         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1623
1624         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1625         if ((new_mtu < 68) ||
1626             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1627                 netif_err(adapter, probe, adapter->netdev,
1628                           "Invalid MTU setting %d\n", new_mtu);
1629                 return -EINVAL;
1630         }
1631
1632         if (old_max_frame == max_frame)
1633                 return 0;
1634
1635         if (netif_running(netdev))
1636                 ixgb_down(adapter, true);
1637
1638         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1639
1640         netdev->mtu = new_mtu;
1641
1642         if (netif_running(netdev))
1643                 ixgb_up(adapter);
1644
1645         return 0;
1646 }
1647
1648 /**
1649  * ixgb_update_stats - Update the board statistics counters.
1650  * @adapter: board private structure
1651  **/
1652
1653 void
1654 ixgb_update_stats(struct ixgb_adapter *adapter)
1655 {
1656         struct net_device *netdev = adapter->netdev;
1657         struct pci_dev *pdev = adapter->pdev;
1658
1659         /* Prevent stats update while adapter is being reset */
1660         if (pci_channel_offline(pdev))
1661                 return;
1662
1663         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1664            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1665                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1666                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1667                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1668                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1669
1670                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1671                 /* fix up multicast stats by removing broadcasts */
1672                 if (multi >= bcast)
1673                         multi -= bcast;
1674
1675                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1676                 adapter->stats.mprch += (multi >> 32);
1677                 adapter->stats.bprcl += bcast_l;
1678                 adapter->stats.bprch += bcast_h;
1679         } else {
1680                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1681                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1682                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1683                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1684         }
1685         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1686         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1687         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1688         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1689         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1690         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1691         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1692         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1693         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1694         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1695         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1696         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1697         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1698         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1699         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1700         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1701         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1702         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1703         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1704         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1705         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1706         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1707         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1708         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1709         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1710         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1711         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1712         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1713         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1714         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1715         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1716         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1717         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1718         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1719         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1720         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1721         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1722         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1723         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1724         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1725         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1726         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1727         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1728         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1729         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1730         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1731         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1732         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1733         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1734         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1735         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1736         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1737         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1738         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1739         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1740         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1741
1742         /* Fill out the OS statistics structure */
1743
1744         netdev->stats.rx_packets = adapter->stats.gprcl;
1745         netdev->stats.tx_packets = adapter->stats.gptcl;
1746         netdev->stats.rx_bytes = adapter->stats.gorcl;
1747         netdev->stats.tx_bytes = adapter->stats.gotcl;
1748         netdev->stats.multicast = adapter->stats.mprcl;
1749         netdev->stats.collisions = 0;
1750
1751         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1752          * with a length in the type/len field */
1753         netdev->stats.rx_errors =
1754             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1755             adapter->stats.ruc +
1756             adapter->stats.roc /*+ adapter->stats.rlec */  +
1757             adapter->stats.icbc +
1758             adapter->stats.ecbc + adapter->stats.mpc;
1759
1760         /* see above
1761          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1762          */
1763
1764         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1765         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1766         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1767         netdev->stats.rx_over_errors = adapter->stats.mpc;
1768
1769         netdev->stats.tx_errors = 0;
1770         netdev->stats.rx_frame_errors = 0;
1771         netdev->stats.tx_aborted_errors = 0;
1772         netdev->stats.tx_carrier_errors = 0;
1773         netdev->stats.tx_fifo_errors = 0;
1774         netdev->stats.tx_heartbeat_errors = 0;
1775         netdev->stats.tx_window_errors = 0;
1776 }
1777
1778 #define IXGB_MAX_INTR 10
1779 /**
1780  * ixgb_intr - Interrupt Handler
1781  * @irq: interrupt number
1782  * @data: pointer to a network interface device structure
1783  **/
1784
1785 static irqreturn_t
1786 ixgb_intr(int irq, void *data)
1787 {
1788         struct net_device *netdev = data;
1789         struct ixgb_adapter *adapter = netdev_priv(netdev);
1790         struct ixgb_hw *hw = &adapter->hw;
1791         u32 icr = IXGB_READ_REG(hw, ICR);
1792
1793         if (unlikely(!icr))
1794                 return IRQ_NONE;  /* Not our interrupt */
1795
1796         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1797                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1798                         mod_timer(&adapter->watchdog_timer, jiffies);
1799
1800         if (napi_schedule_prep(&adapter->napi)) {
1801
1802                 /* Disable interrupts and register for poll. The flush
1803                   of the posted write is intentionally left out.
1804                 */
1805
1806                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1807                 __napi_schedule(&adapter->napi);
1808         }
1809         return IRQ_HANDLED;
1810 }
1811
1812 /**
1813  * ixgb_clean - NAPI Rx polling callback
1814  * @adapter: board private structure
1815  **/
1816
1817 static int
1818 ixgb_clean(struct napi_struct *napi, int budget)
1819 {
1820         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1821         int work_done = 0;
1822
1823         ixgb_clean_tx_irq(adapter);
1824         ixgb_clean_rx_irq(adapter, &work_done, budget);
1825
1826         /* If budget not fully consumed, exit the polling mode */
1827         if (work_done < budget) {
1828                 napi_complete(napi);
1829                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1830                         ixgb_irq_enable(adapter);
1831         }
1832
1833         return work_done;
1834 }
1835
1836 /**
1837  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1838  * @adapter: board private structure
1839  **/
1840
1841 static bool
1842 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1843 {
1844         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1845         struct net_device *netdev = adapter->netdev;
1846         struct ixgb_tx_desc *tx_desc, *eop_desc;
1847         struct ixgb_buffer *buffer_info;
1848         unsigned int i, eop;
1849         bool cleaned = false;
1850
1851         i = tx_ring->next_to_clean;
1852         eop = tx_ring->buffer_info[i].next_to_watch;
1853         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1854
1855         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1856
1857                 rmb(); /* read buffer_info after eop_desc */
1858                 for (cleaned = false; !cleaned; ) {
1859                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1860                         buffer_info = &tx_ring->buffer_info[i];
1861
1862                         if (tx_desc->popts &
1863                            (IXGB_TX_DESC_POPTS_TXSM |
1864                             IXGB_TX_DESC_POPTS_IXSM))
1865                                 adapter->hw_csum_tx_good++;
1866
1867                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1868
1869                         *(u32 *)&(tx_desc->status) = 0;
1870
1871                         cleaned = (i == eop);
1872                         if (++i == tx_ring->count) i = 0;
1873                 }
1874
1875                 eop = tx_ring->buffer_info[i].next_to_watch;
1876                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1877         }
1878
1879         tx_ring->next_to_clean = i;
1880
1881         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1882                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1883                 /* Make sure that anybody stopping the queue after this
1884                  * sees the new next_to_clean. */
1885                 smp_mb();
1886
1887                 if (netif_queue_stopped(netdev) &&
1888                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1889                         netif_wake_queue(netdev);
1890                         ++adapter->restart_queue;
1891                 }
1892         }
1893
1894         if (adapter->detect_tx_hung) {
1895                 /* detect a transmit hang in hardware, this serializes the
1896                  * check with the clearing of time_stamp and movement of i */
1897                 adapter->detect_tx_hung = false;
1898                 if (tx_ring->buffer_info[eop].time_stamp &&
1899                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1900                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1901                         IXGB_STATUS_TXOFF)) {
1902                         /* detected Tx unit hang */
1903                         netif_err(adapter, drv, adapter->netdev,
1904                                   "Detected Tx Unit Hang\n"
1905                                   "  TDH                  <%x>\n"
1906                                   "  TDT                  <%x>\n"
1907                                   "  next_to_use          <%x>\n"
1908                                   "  next_to_clean        <%x>\n"
1909                                   "buffer_info[next_to_clean]\n"
1910                                   "  time_stamp           <%lx>\n"
1911                                   "  next_to_watch        <%x>\n"
1912                                   "  jiffies              <%lx>\n"
1913                                   "  next_to_watch.status <%x>\n",
1914                                   IXGB_READ_REG(&adapter->hw, TDH),
1915                                   IXGB_READ_REG(&adapter->hw, TDT),
1916                                   tx_ring->next_to_use,
1917                                   tx_ring->next_to_clean,
1918                                   tx_ring->buffer_info[eop].time_stamp,
1919                                   eop,
1920                                   jiffies,
1921                                   eop_desc->status);
1922                         netif_stop_queue(netdev);
1923                 }
1924         }
1925
1926         return cleaned;
1927 }
1928
1929 /**
1930  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1931  * @adapter: board private structure
1932  * @rx_desc: receive descriptor
1933  * @sk_buff: socket buffer with received data
1934  **/
1935
1936 static void
1937 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1938                  struct ixgb_rx_desc *rx_desc,
1939                  struct sk_buff *skb)
1940 {
1941         /* Ignore Checksum bit is set OR
1942          * TCP Checksum has not been calculated
1943          */
1944         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1945            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1946                 skb_checksum_none_assert(skb);
1947                 return;
1948         }
1949
1950         /* At this point we know the hardware did the TCP checksum */
1951         /* now look at the TCP checksum error bit */
1952         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1953                 /* let the stack verify checksum errors */
1954                 skb_checksum_none_assert(skb);
1955                 adapter->hw_csum_rx_error++;
1956         } else {
1957                 /* TCP checksum is good */
1958                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1959                 adapter->hw_csum_rx_good++;
1960         }
1961 }
1962
1963 /*
1964  * this should improve performance for small packets with large amounts
1965  * of reassembly being done in the stack
1966  */
1967 static void ixgb_check_copybreak(struct napi_struct *napi,
1968                                  struct ixgb_buffer *buffer_info,
1969                                  u32 length, struct sk_buff **skb)
1970 {
1971         struct sk_buff *new_skb;
1972
1973         if (length > copybreak)
1974                 return;
1975
1976         new_skb = napi_alloc_skb(napi, length);
1977         if (!new_skb)
1978                 return;
1979
1980         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1981                                        (*skb)->data - NET_IP_ALIGN,
1982                                        length + NET_IP_ALIGN);
1983         /* save the skb in buffer_info as good */
1984         buffer_info->skb = *skb;
1985         *skb = new_skb;
1986 }
1987
1988 /**
1989  * ixgb_clean_rx_irq - Send received data up the network stack,
1990  * @adapter: board private structure
1991  **/
1992
1993 static bool
1994 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1995 {
1996         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1997         struct net_device *netdev = adapter->netdev;
1998         struct pci_dev *pdev = adapter->pdev;
1999         struct ixgb_rx_desc *rx_desc, *next_rxd;
2000         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2001         u32 length;
2002         unsigned int i, j;
2003         int cleaned_count = 0;
2004         bool cleaned = false;
2005
2006         i = rx_ring->next_to_clean;
2007         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2008         buffer_info = &rx_ring->buffer_info[i];
2009
2010         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2011                 struct sk_buff *skb;
2012                 u8 status;
2013
2014                 if (*work_done >= work_to_do)
2015                         break;
2016
2017                 (*work_done)++;
2018                 rmb();  /* read descriptor and rx_buffer_info after status DD */
2019                 status = rx_desc->status;
2020                 skb = buffer_info->skb;
2021                 buffer_info->skb = NULL;
2022
2023                 prefetch(skb->data - NET_IP_ALIGN);
2024
2025                 if (++i == rx_ring->count)
2026                         i = 0;
2027                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2028                 prefetch(next_rxd);
2029
2030                 j = i + 1;
2031                 if (j == rx_ring->count)
2032                         j = 0;
2033                 next2_buffer = &rx_ring->buffer_info[j];
2034                 prefetch(next2_buffer);
2035
2036                 next_buffer = &rx_ring->buffer_info[i];
2037
2038                 cleaned = true;
2039                 cleaned_count++;
2040
2041                 dma_unmap_single(&pdev->dev,
2042                                  buffer_info->dma,
2043                                  buffer_info->length,
2044                                  DMA_FROM_DEVICE);
2045                 buffer_info->dma = 0;
2046
2047                 length = le16_to_cpu(rx_desc->length);
2048                 rx_desc->length = 0;
2049
2050                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2051
2052                         /* All receives must fit into a single buffer */
2053
2054                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2055                                  length);
2056
2057                         dev_kfree_skb_irq(skb);
2058                         goto rxdesc_done;
2059                 }
2060
2061                 if (unlikely(rx_desc->errors &
2062                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2063                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2064                         dev_kfree_skb_irq(skb);
2065                         goto rxdesc_done;
2066                 }
2067
2068                 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2069
2070                 /* Good Receive */
2071                 skb_put(skb, length);
2072
2073                 /* Receive Checksum Offload */
2074                 ixgb_rx_checksum(adapter, rx_desc, skb);
2075
2076                 skb->protocol = eth_type_trans(skb, netdev);
2077                 if (status & IXGB_RX_DESC_STATUS_VP)
2078                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2079                                        le16_to_cpu(rx_desc->special));
2080
2081                 netif_receive_skb(skb);
2082
2083 rxdesc_done:
2084                 /* clean up descriptor, might be written over by hw */
2085                 rx_desc->status = 0;
2086
2087                 /* return some buffers to hardware, one at a time is too slow */
2088                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2089                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2090                         cleaned_count = 0;
2091                 }
2092
2093                 /* use prefetched values */
2094                 rx_desc = next_rxd;
2095                 buffer_info = next_buffer;
2096         }
2097
2098         rx_ring->next_to_clean = i;
2099
2100         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2101         if (cleaned_count)
2102                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2103
2104         return cleaned;
2105 }
2106
2107 /**
2108  * ixgb_alloc_rx_buffers - Replace used receive buffers
2109  * @adapter: address of board private structure
2110  **/
2111
2112 static void
2113 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2114 {
2115         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2116         struct net_device *netdev = adapter->netdev;
2117         struct pci_dev *pdev = adapter->pdev;
2118         struct ixgb_rx_desc *rx_desc;
2119         struct ixgb_buffer *buffer_info;
2120         struct sk_buff *skb;
2121         unsigned int i;
2122         long cleancount;
2123
2124         i = rx_ring->next_to_use;
2125         buffer_info = &rx_ring->buffer_info[i];
2126         cleancount = IXGB_DESC_UNUSED(rx_ring);
2127
2128
2129         /* leave three descriptors unused */
2130         while (--cleancount > 2 && cleaned_count--) {
2131                 /* recycle! its good for you */
2132                 skb = buffer_info->skb;
2133                 if (skb) {
2134                         skb_trim(skb, 0);
2135                         goto map_skb;
2136                 }
2137
2138                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2139                 if (unlikely(!skb)) {
2140                         /* Better luck next round */
2141                         adapter->alloc_rx_buff_failed++;
2142                         break;
2143                 }
2144
2145                 buffer_info->skb = skb;
2146                 buffer_info->length = adapter->rx_buffer_len;
2147 map_skb:
2148                 buffer_info->dma = dma_map_single(&pdev->dev,
2149                                                   skb->data,
2150                                                   adapter->rx_buffer_len,
2151                                                   DMA_FROM_DEVICE);
2152                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2153                         adapter->alloc_rx_buff_failed++;
2154                         break;
2155                 }
2156
2157                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2158                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2159                 /* guarantee DD bit not set now before h/w gets descriptor
2160                  * this is the rest of the workaround for h/w double
2161                  * writeback. */
2162                 rx_desc->status = 0;
2163
2164
2165                 if (++i == rx_ring->count)
2166                         i = 0;
2167                 buffer_info = &rx_ring->buffer_info[i];
2168         }
2169
2170         if (likely(rx_ring->next_to_use != i)) {
2171                 rx_ring->next_to_use = i;
2172                 if (unlikely(i-- == 0))
2173                         i = (rx_ring->count - 1);
2174
2175                 /* Force memory writes to complete before letting h/w
2176                  * know there are new descriptors to fetch.  (Only
2177                  * applicable for weak-ordered memory model archs, such
2178                  * as IA-64). */
2179                 wmb();
2180                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2181         }
2182 }
2183
2184 static void
2185 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2186 {
2187         u32 ctrl;
2188
2189         /* enable VLAN tag insert/strip */
2190         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2191         ctrl |= IXGB_CTRL0_VME;
2192         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2193 }
2194
2195 static void
2196 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2197 {
2198         u32 ctrl;
2199
2200         /* disable VLAN tag insert/strip */
2201         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2202         ctrl &= ~IXGB_CTRL0_VME;
2203         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2204 }
2205
2206 static int
2207 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2208 {
2209         struct ixgb_adapter *adapter = netdev_priv(netdev);
2210         u32 vfta, index;
2211
2212         /* add VID to filter table */
2213
2214         index = (vid >> 5) & 0x7F;
2215         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2216         vfta |= (1 << (vid & 0x1F));
2217         ixgb_write_vfta(&adapter->hw, index, vfta);
2218         set_bit(vid, adapter->active_vlans);
2219
2220         return 0;
2221 }
2222
2223 static int
2224 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2225 {
2226         struct ixgb_adapter *adapter = netdev_priv(netdev);
2227         u32 vfta, index;
2228
2229         /* remove VID from filter table */
2230
2231         index = (vid >> 5) & 0x7F;
2232         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2233         vfta &= ~(1 << (vid & 0x1F));
2234         ixgb_write_vfta(&adapter->hw, index, vfta);
2235         clear_bit(vid, adapter->active_vlans);
2236
2237         return 0;
2238 }
2239
2240 static void
2241 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2242 {
2243         u16 vid;
2244
2245         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2246                 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2247 }
2248
2249 #ifdef CONFIG_NET_POLL_CONTROLLER
2250 /*
2251  * Polling 'interrupt' - used by things like netconsole to send skbs
2252  * without having to re-enable interrupts. It's not called while
2253  * the interrupt routine is executing.
2254  */
2255
2256 static void ixgb_netpoll(struct net_device *dev)
2257 {
2258         struct ixgb_adapter *adapter = netdev_priv(dev);
2259
2260         disable_irq(adapter->pdev->irq);
2261         ixgb_intr(adapter->pdev->irq, dev);
2262         enable_irq(adapter->pdev->irq);
2263 }
2264 #endif
2265
2266 /**
2267  * ixgb_io_error_detected - called when PCI error is detected
2268  * @pdev:    pointer to pci device with error
2269  * @state:   pci channel state after error
2270  *
2271  * This callback is called by the PCI subsystem whenever
2272  * a PCI bus error is detected.
2273  */
2274 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2275                                                enum pci_channel_state state)
2276 {
2277         struct net_device *netdev = pci_get_drvdata(pdev);
2278         struct ixgb_adapter *adapter = netdev_priv(netdev);
2279
2280         netif_device_detach(netdev);
2281
2282         if (state == pci_channel_io_perm_failure)
2283                 return PCI_ERS_RESULT_DISCONNECT;
2284
2285         if (netif_running(netdev))
2286                 ixgb_down(adapter, true);
2287
2288         pci_disable_device(pdev);
2289
2290         /* Request a slot reset. */
2291         return PCI_ERS_RESULT_NEED_RESET;
2292 }
2293
2294 /**
2295  * ixgb_io_slot_reset - called after the pci bus has been reset.
2296  * @pdev    pointer to pci device with error
2297  *
2298  * This callback is called after the PCI bus has been reset.
2299  * Basically, this tries to restart the card from scratch.
2300  * This is a shortened version of the device probe/discovery code,
2301  * it resembles the first-half of the ixgb_probe() routine.
2302  */
2303 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2304 {
2305         struct net_device *netdev = pci_get_drvdata(pdev);
2306         struct ixgb_adapter *adapter = netdev_priv(netdev);
2307
2308         if (pci_enable_device(pdev)) {
2309                 netif_err(adapter, probe, adapter->netdev,
2310                           "Cannot re-enable PCI device after reset\n");
2311                 return PCI_ERS_RESULT_DISCONNECT;
2312         }
2313
2314         /* Perform card reset only on one instance of the card */
2315         if (0 != PCI_FUNC (pdev->devfn))
2316                 return PCI_ERS_RESULT_RECOVERED;
2317
2318         pci_set_master(pdev);
2319
2320         netif_carrier_off(netdev);
2321         netif_stop_queue(netdev);
2322         ixgb_reset(adapter);
2323
2324         /* Make sure the EEPROM is good */
2325         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2326                 netif_err(adapter, probe, adapter->netdev,
2327                           "After reset, the EEPROM checksum is not valid\n");
2328                 return PCI_ERS_RESULT_DISCONNECT;
2329         }
2330         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2331         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2332
2333         if (!is_valid_ether_addr(netdev->perm_addr)) {
2334                 netif_err(adapter, probe, adapter->netdev,
2335                           "After reset, invalid MAC address\n");
2336                 return PCI_ERS_RESULT_DISCONNECT;
2337         }
2338
2339         return PCI_ERS_RESULT_RECOVERED;
2340 }
2341
2342 /**
2343  * ixgb_io_resume - called when its OK to resume normal operations
2344  * @pdev    pointer to pci device with error
2345  *
2346  * The error recovery driver tells us that its OK to resume
2347  * normal operation. Implementation resembles the second-half
2348  * of the ixgb_probe() routine.
2349  */
2350 static void ixgb_io_resume(struct pci_dev *pdev)
2351 {
2352         struct net_device *netdev = pci_get_drvdata(pdev);
2353         struct ixgb_adapter *adapter = netdev_priv(netdev);
2354
2355         pci_set_master(pdev);
2356
2357         if (netif_running(netdev)) {
2358                 if (ixgb_up(adapter)) {
2359                         pr_err("can't bring device back up after reset\n");
2360                         return;
2361                 }
2362         }
2363
2364         netif_device_attach(netdev);
2365         mod_timer(&adapter->watchdog_timer, jiffies);
2366 }
2367
2368 /* ixgb_main.c */