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