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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / net / ethernet / intel / ixgb / ixgb_main.c
blobc8b9c9028bc0f0ea310d85ec1dd4049639f56ee9
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 DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
57 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
59 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
61 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
63 {INTEL_VENDOR_ID, 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 __devexit 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 void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
105 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
107
108 #ifdef CONFIG_NET_POLL_CONTROLLER
109 /* for netdump / net console */
110 static void ixgb_netpoll(struct net_device *dev);
111 #endif
112
113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
114 enum pci_channel_state state);
115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
116 static void ixgb_io_resume (struct pci_dev *pdev);
117
118 static struct pci_error_handlers ixgb_err_handler = {
119 .error_detected = ixgb_io_error_detected,
120 .slot_reset = ixgb_io_slot_reset,
121 .resume = ixgb_io_resume,
122 };
123
124 static struct pci_driver ixgb_driver = {
125 .name = ixgb_driver_name,
126 .id_table = ixgb_pci_tbl,
127 .probe = ixgb_probe,
128 .remove = __devexit_p(ixgb_remove),
129 .err_handler = &ixgb_err_handler
130 };
131
132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
134 MODULE_LICENSE("GPL");
135 MODULE_VERSION(DRV_VERSION);
136
137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
139 module_param(debug, int, 0);
140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
141
142 /**
143 * ixgb_init_module - Driver Registration Routine
144 *
145 * ixgb_init_module is the first routine called when the driver is
146 * loaded. All it does is register with the PCI subsystem.
147 **/
148
149 static int __init
150 ixgb_init_module(void)
151 {
152 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
153 pr_info("%s\n", ixgb_copyright);
154
155 return pci_register_driver(&ixgb_driver);
156 }
157
158 module_init(ixgb_init_module);
159
160 /**
161 * ixgb_exit_module - Driver Exit Cleanup Routine
162 *
163 * ixgb_exit_module is called just before the driver is removed
164 * from memory.
165 **/
166
167 static void __exit
168 ixgb_exit_module(void)
169 {
170 pci_unregister_driver(&ixgb_driver);
171 }
172
173 module_exit(ixgb_exit_module);
174
175 /**
176 * ixgb_irq_disable - Mask off interrupt generation on the NIC
177 * @adapter: board private structure
178 **/
179
180 static void
181 ixgb_irq_disable(struct ixgb_adapter *adapter)
182 {
183 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
184 IXGB_WRITE_FLUSH(&adapter->hw);
185 synchronize_irq(adapter->pdev->irq);
186 }
187
188 /**
189 * ixgb_irq_enable - Enable default interrupt generation settings
190 * @adapter: board private structure
191 **/
192
193 static void
194 ixgb_irq_enable(struct ixgb_adapter *adapter)
195 {
196 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
197 IXGB_INT_TXDW | IXGB_INT_LSC;
198 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
199 val |= IXGB_INT_GPI0;
200 IXGB_WRITE_REG(&adapter->hw, IMS, val);
201 IXGB_WRITE_FLUSH(&adapter->hw);
202 }
203
204 int
205 ixgb_up(struct ixgb_adapter *adapter)
206 {
207 struct net_device *netdev = adapter->netdev;
208 int err, irq_flags = IRQF_SHARED;
209 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
210 struct ixgb_hw *hw = &adapter->hw;
211
212 /* hardware has been reset, we need to reload some things */
213
214 ixgb_rar_set(hw, netdev->dev_addr, 0);
215 ixgb_set_multi(netdev);
216
217 ixgb_restore_vlan(adapter);
218
219 ixgb_configure_tx(adapter);
220 ixgb_setup_rctl(adapter);
221 ixgb_configure_rx(adapter);
222 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
223
224 /* disable interrupts and get the hardware into a known state */
225 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
226
227 /* only enable MSI if bus is in PCI-X mode */
228 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
229 err = pci_enable_msi(adapter->pdev);
230 if (!err) {
231 adapter->have_msi = 1;
232 irq_flags = 0;
233 }
234 /* proceed to try to request regular interrupt */
235 }
236
237 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
238 netdev->name, netdev);
239 if (err) {
240 if (adapter->have_msi)
241 pci_disable_msi(adapter->pdev);
242 netif_err(adapter, probe, adapter->netdev,
243 "Unable to allocate interrupt Error: %d\n", err);
244 return err;
245 }
246
247 if ((hw->max_frame_size != max_frame) ||
248 (hw->max_frame_size !=
249 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
250
251 hw->max_frame_size = max_frame;
252
253 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
254
255 if (hw->max_frame_size >
256 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
257 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
258
259 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
260 ctrl0 |= IXGB_CTRL0_JFE;
261 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
262 }
263 }
264 }
265
266 clear_bit(__IXGB_DOWN, &adapter->flags);
267
268 napi_enable(&adapter->napi);
269 ixgb_irq_enable(adapter);
270
271 netif_wake_queue(netdev);
272
273 mod_timer(&adapter->watchdog_timer, jiffies);
274
275 return 0;
276 }
277
278 void
279 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
280 {
281 struct net_device *netdev = adapter->netdev;
282
283 /* prevent the interrupt handler from restarting watchdog */
284 set_bit(__IXGB_DOWN, &adapter->flags);
285
286 napi_disable(&adapter->napi);
287 /* waiting for NAPI to complete can re-enable interrupts */
288 ixgb_irq_disable(adapter);
289 free_irq(adapter->pdev->irq, netdev);
290
291 if (adapter->have_msi)
292 pci_disable_msi(adapter->pdev);
293
294 if (kill_watchdog)
295 del_timer_sync(&adapter->watchdog_timer);
296
297 adapter->link_speed = 0;
298 adapter->link_duplex = 0;
299 netif_carrier_off(netdev);
300 netif_stop_queue(netdev);
301
302 ixgb_reset(adapter);
303 ixgb_clean_tx_ring(adapter);
304 ixgb_clean_rx_ring(adapter);
305 }
306
307 void
308 ixgb_reset(struct ixgb_adapter *adapter)
309 {
310 struct ixgb_hw *hw = &adapter->hw;
311
312 ixgb_adapter_stop(hw);
313 if (!ixgb_init_hw(hw))
314 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
315
316 /* restore frame size information */
317 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
318 if (hw->max_frame_size >
319 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
320 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
321 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
322 ctrl0 |= IXGB_CTRL0_JFE;
323 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
324 }
325 }
326 }
327
328 static const struct net_device_ops ixgb_netdev_ops = {
329 .ndo_open = ixgb_open,
330 .ndo_stop = ixgb_close,
331 .ndo_start_xmit = ixgb_xmit_frame,
332 .ndo_get_stats = ixgb_get_stats,
333 .ndo_set_rx_mode = ixgb_set_multi,
334 .ndo_validate_addr = eth_validate_addr,
335 .ndo_set_mac_address = ixgb_set_mac,
336 .ndo_change_mtu = ixgb_change_mtu,
337 .ndo_tx_timeout = ixgb_tx_timeout,
338 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
339 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
340 #ifdef CONFIG_NET_POLL_CONTROLLER
341 .ndo_poll_controller = ixgb_netpoll,
342 #endif
343 };
344
345 /**
346 * ixgb_probe - Device Initialization Routine
347 * @pdev: PCI device information struct
348 * @ent: entry in ixgb_pci_tbl
349 *
350 * Returns 0 on success, negative on failure
351 *
352 * ixgb_probe initializes an adapter identified by a pci_dev structure.
353 * The OS initialization, configuring of the adapter private structure,
354 * and a hardware reset occur.
355 **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
359 {
360 struct net_device *netdev = NULL;
361 struct ixgb_adapter *adapter;
362 static int cards_found = 0;
363 int pci_using_dac;
364 int i;
365 int err;
366
367 err = pci_enable_device(pdev);
368 if (err)
369 return err;
370
371 pci_using_dac = 0;
372 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
373 if (!err) {
374 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
375 if (!err)
376 pci_using_dac = 1;
377 } else {
378 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
379 if (err) {
380 err = dma_set_coherent_mask(&pdev->dev,
381 DMA_BIT_MASK(32));
382 if (err) {
383 pr_err("No usable DMA configuration, aborting\n");
384 goto err_dma_mask;
385 }
386 }
387 }
388
389 err = pci_request_regions(pdev, ixgb_driver_name);
390 if (err)
391 goto err_request_regions;
392
393 pci_set_master(pdev);
394
395 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
396 if (!netdev) {
397 err = -ENOMEM;
398 goto err_alloc_etherdev;
399 }
400
401 SET_NETDEV_DEV(netdev, &pdev->dev);
402
403 pci_set_drvdata(pdev, netdev);
404 adapter = netdev_priv(netdev);
405 adapter->netdev = netdev;
406 adapter->pdev = pdev;
407 adapter->hw.back = adapter;
408 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
409
410 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
411 if (!adapter->hw.hw_addr) {
412 err = -EIO;
413 goto err_ioremap;
414 }
415
416 for (i = BAR_1; i <= BAR_5; i++) {
417 if (pci_resource_len(pdev, i) == 0)
418 continue;
419 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
420 adapter->hw.io_base = pci_resource_start(pdev, i);
421 break;
422 }
423 }
424
425 netdev->netdev_ops = &ixgb_netdev_ops;
426 ixgb_set_ethtool_ops(netdev);
427 netdev->watchdog_timeo = 5 * HZ;
428 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
429
430 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
431
432 adapter->bd_number = cards_found;
433 adapter->link_speed = 0;
434 adapter->link_duplex = 0;
435
436 /* setup the private structure */
437
438 err = ixgb_sw_init(adapter);
439 if (err)
440 goto err_sw_init;
441
442 netdev->features = NETIF_F_SG |
443 NETIF_F_HW_CSUM |
444 NETIF_F_HW_VLAN_TX |
445 NETIF_F_HW_VLAN_RX |
446 NETIF_F_HW_VLAN_FILTER;
447 netdev->features |= NETIF_F_TSO;
448
449 if (pci_using_dac) {
450 netdev->features |= NETIF_F_HIGHDMA;
451 netdev->vlan_features |= NETIF_F_HIGHDMA;
452 }
453
454 /* make sure the EEPROM is good */
455
456 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
457 netif_err(adapter, probe, adapter->netdev,
458 "The EEPROM Checksum Is Not Valid\n");
459 err = -EIO;
460 goto err_eeprom;
461 }
462
463 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
464 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
465
466 if (!is_valid_ether_addr(netdev->perm_addr)) {
467 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
468 err = -EIO;
469 goto err_eeprom;
470 }
471
472 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
473
474 init_timer(&adapter->watchdog_timer);
475 adapter->watchdog_timer.function = ixgb_watchdog;
476 adapter->watchdog_timer.data = (unsigned long)adapter;
477
478 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
479
480 strcpy(netdev->name, "eth%d");
481 err = register_netdev(netdev);
482 if (err)
483 goto err_register;
484
485 /* carrier off reporting is important to ethtool even BEFORE open */
486 netif_carrier_off(netdev);
487
488 netif_info(adapter, probe, adapter->netdev,
489 "Intel(R) PRO/10GbE Network Connection\n");
490 ixgb_check_options(adapter);
491 /* reset the hardware with the new settings */
492
493 ixgb_reset(adapter);
494
495 cards_found++;
496 return 0;
497
498 err_register:
499 err_sw_init:
500 err_eeprom:
501 iounmap(adapter->hw.hw_addr);
502 err_ioremap:
503 free_netdev(netdev);
504 err_alloc_etherdev:
505 pci_release_regions(pdev);
506 err_request_regions:
507 err_dma_mask:
508 pci_disable_device(pdev);
509 return err;
510 }
511
512 /**
513 * ixgb_remove - Device Removal Routine
514 * @pdev: PCI device information struct
515 *
516 * ixgb_remove is called by the PCI subsystem to alert the driver
517 * that it should release a PCI device. The could be caused by a
518 * Hot-Plug event, or because the driver is going to be removed from
519 * memory.
520 **/
521
522 static void __devexit
523 ixgb_remove(struct pci_dev *pdev)
524 {
525 struct net_device *netdev = pci_get_drvdata(pdev);
526 struct ixgb_adapter *adapter = netdev_priv(netdev);
527
528 cancel_work_sync(&adapter->tx_timeout_task);
529
530 unregister_netdev(netdev);
531
532 iounmap(adapter->hw.hw_addr);
533 pci_release_regions(pdev);
534
535 free_netdev(netdev);
536 pci_disable_device(pdev);
537 }
538
539 /**
540 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
541 * @adapter: board private structure to initialize
542 *
543 * ixgb_sw_init initializes the Adapter private data structure.
544 * Fields are initialized based on PCI device information and
545 * OS network device settings (MTU size).
546 **/
547
548 static int __devinit
549 ixgb_sw_init(struct ixgb_adapter *adapter)
550 {
551 struct ixgb_hw *hw = &adapter->hw;
552 struct net_device *netdev = adapter->netdev;
553 struct pci_dev *pdev = adapter->pdev;
554
555 /* PCI config space info */
556
557 hw->vendor_id = pdev->vendor;
558 hw->device_id = pdev->device;
559 hw->subsystem_vendor_id = pdev->subsystem_vendor;
560 hw->subsystem_id = pdev->subsystem_device;
561
562 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
563 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
564
565 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
566 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
567 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
568 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
569 hw->mac_type = ixgb_82597;
570 else {
571 /* should never have loaded on this device */
572 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
573 }
574
575 /* enable flow control to be programmed */
576 hw->fc.send_xon = 1;
577
578 set_bit(__IXGB_DOWN, &adapter->flags);
579 return 0;
580 }
581
582 /**
583 * ixgb_open - Called when a network interface is made active
584 * @netdev: network interface device structure
585 *
586 * Returns 0 on success, negative value on failure
587 *
588 * The open entry point is called when a network interface is made
589 * active by the system (IFF_UP). At this point all resources needed
590 * for transmit and receive operations are allocated, the interrupt
591 * handler is registered with the OS, the watchdog timer is started,
592 * and the stack is notified that the interface is ready.
593 **/
594
595 static int
596 ixgb_open(struct net_device *netdev)
597 {
598 struct ixgb_adapter *adapter = netdev_priv(netdev);
599 int err;
600
601 /* allocate transmit descriptors */
602 err = ixgb_setup_tx_resources(adapter);
603 if (err)
604 goto err_setup_tx;
605
606 netif_carrier_off(netdev);
607
608 /* allocate receive descriptors */
609
610 err = ixgb_setup_rx_resources(adapter);
611 if (err)
612 goto err_setup_rx;
613
614 err = ixgb_up(adapter);
615 if (err)
616 goto err_up;
617
618 netif_start_queue(netdev);
619
620 return 0;
621
622 err_up:
623 ixgb_free_rx_resources(adapter);
624 err_setup_rx:
625 ixgb_free_tx_resources(adapter);
626 err_setup_tx:
627 ixgb_reset(adapter);
628
629 return err;
630 }
631
632 /**
633 * ixgb_close - Disables a network interface
634 * @netdev: network interface device structure
635 *
636 * Returns 0, this is not allowed to fail
637 *
638 * The close entry point is called when an interface is de-activated
639 * by the OS. The hardware is still under the drivers control, but
640 * needs to be disabled. A global MAC reset is issued to stop the
641 * hardware, and all transmit and receive resources are freed.
642 **/
643
644 static int
645 ixgb_close(struct net_device *netdev)
646 {
647 struct ixgb_adapter *adapter = netdev_priv(netdev);
648
649 ixgb_down(adapter, true);
650
651 ixgb_free_tx_resources(adapter);
652 ixgb_free_rx_resources(adapter);
653
654 return 0;
655 }
656
657 /**
658 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
659 * @adapter: board private structure
660 *
661 * Return 0 on success, negative on failure
662 **/
663
664 int
665 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
666 {
667 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
668 struct pci_dev *pdev = adapter->pdev;
669 int size;
670
671 size = sizeof(struct ixgb_buffer) * txdr->count;
672 txdr->buffer_info = vzalloc(size);
673 if (!txdr->buffer_info) {
674 netif_err(adapter, probe, adapter->netdev,
675 "Unable to allocate transmit descriptor ring memory\n");
676 return -ENOMEM;
677 }
678
679 /* round up to nearest 4K */
680
681 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
682 txdr->size = ALIGN(txdr->size, 4096);
683
684 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
685 GFP_KERNEL);
686 if (!txdr->desc) {
687 vfree(txdr->buffer_info);
688 netif_err(adapter, probe, adapter->netdev,
689 "Unable to allocate transmit descriptor memory\n");
690 return -ENOMEM;
691 }
692 memset(txdr->desc, 0, txdr->size);
693
694 txdr->next_to_use = 0;
695 txdr->next_to_clean = 0;
696
697 return 0;
698 }
699
700 /**
701 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
702 * @adapter: board private structure
703 *
704 * Configure the Tx unit of the MAC after a reset.
705 **/
706
707 static void
708 ixgb_configure_tx(struct ixgb_adapter *adapter)
709 {
710 u64 tdba = adapter->tx_ring.dma;
711 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
712 u32 tctl;
713 struct ixgb_hw *hw = &adapter->hw;
714
715 /* Setup the Base and Length of the Tx Descriptor Ring
716 * tx_ring.dma can be either a 32 or 64 bit value
717 */
718
719 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
720 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
721
722 IXGB_WRITE_REG(hw, TDLEN, tdlen);
723
724 /* Setup the HW Tx Head and Tail descriptor pointers */
725
726 IXGB_WRITE_REG(hw, TDH, 0);
727 IXGB_WRITE_REG(hw, TDT, 0);
728
729 /* don't set up txdctl, it induces performance problems if configured
730 * incorrectly */
731 /* Set the Tx Interrupt Delay register */
732
733 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
734
735 /* Program the Transmit Control Register */
736
737 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
738 IXGB_WRITE_REG(hw, TCTL, tctl);
739
740 /* Setup Transmit Descriptor Settings for this adapter */
741 adapter->tx_cmd_type =
742 IXGB_TX_DESC_TYPE |
743 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
744 }
745
746 /**
747 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
748 * @adapter: board private structure
749 *
750 * Returns 0 on success, negative on failure
751 **/
752
753 int
754 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
755 {
756 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
757 struct pci_dev *pdev = adapter->pdev;
758 int size;
759
760 size = sizeof(struct ixgb_buffer) * rxdr->count;
761 rxdr->buffer_info = vzalloc(size);
762 if (!rxdr->buffer_info) {
763 netif_err(adapter, probe, adapter->netdev,
764 "Unable to allocate receive descriptor ring\n");
765 return -ENOMEM;
766 }
767
768 /* Round up to nearest 4K */
769
770 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
771 rxdr->size = ALIGN(rxdr->size, 4096);
772
773 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
774 GFP_KERNEL);
775
776 if (!rxdr->desc) {
777 vfree(rxdr->buffer_info);
778 netif_err(adapter, probe, adapter->netdev,
779 "Unable to allocate receive descriptors\n");
780 return -ENOMEM;
781 }
782 memset(rxdr->desc, 0, rxdr->size);
783
784 rxdr->next_to_clean = 0;
785 rxdr->next_to_use = 0;
786
787 return 0;
788 }
789
790 /**
791 * ixgb_setup_rctl - configure the receive control register
792 * @adapter: Board private structure
793 **/
794
795 static void
796 ixgb_setup_rctl(struct ixgb_adapter *adapter)
797 {
798 u32 rctl;
799
800 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
801
802 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
803
804 rctl |=
805 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
806 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
807 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
808
809 rctl |= IXGB_RCTL_SECRC;
810
811 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
812 rctl |= IXGB_RCTL_BSIZE_2048;
813 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
814 rctl |= IXGB_RCTL_BSIZE_4096;
815 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
816 rctl |= IXGB_RCTL_BSIZE_8192;
817 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
818 rctl |= IXGB_RCTL_BSIZE_16384;
819
820 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
821 }
822
823 /**
824 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
825 * @adapter: board private structure
826 *
827 * Configure the Rx unit of the MAC after a reset.
828 **/
829
830 static void
831 ixgb_configure_rx(struct ixgb_adapter *adapter)
832 {
833 u64 rdba = adapter->rx_ring.dma;
834 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
835 struct ixgb_hw *hw = &adapter->hw;
836 u32 rctl;
837 u32 rxcsum;
838
839 /* make sure receives are disabled while setting up the descriptors */
840
841 rctl = IXGB_READ_REG(hw, RCTL);
842 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
843
844 /* set the Receive Delay Timer Register */
845
846 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
847
848 /* Setup the Base and Length of the Rx Descriptor Ring */
849
850 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
851 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
852
853 IXGB_WRITE_REG(hw, RDLEN, rdlen);
854
855 /* Setup the HW Rx Head and Tail Descriptor Pointers */
856 IXGB_WRITE_REG(hw, RDH, 0);
857 IXGB_WRITE_REG(hw, RDT, 0);
858
859 /* due to the hardware errata with RXDCTL, we are unable to use any of
860 * the performance enhancing features of it without causing other
861 * subtle bugs, some of the bugs could include receive length
862 * corruption at high data rates (WTHRESH > 0) and/or receive
863 * descriptor ring irregularites (particularly in hardware cache) */
864 IXGB_WRITE_REG(hw, RXDCTL, 0);
865
866 /* Enable Receive Checksum Offload for TCP and UDP */
867 if (adapter->rx_csum) {
868 rxcsum = IXGB_READ_REG(hw, RXCSUM);
869 rxcsum |= IXGB_RXCSUM_TUOFL;
870 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
871 }
872
873 /* Enable Receives */
874
875 IXGB_WRITE_REG(hw, RCTL, rctl);
876 }
877
878 /**
879 * ixgb_free_tx_resources - Free Tx Resources
880 * @adapter: board private structure
881 *
882 * Free all transmit software resources
883 **/
884
885 void
886 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
887 {
888 struct pci_dev *pdev = adapter->pdev;
889
890 ixgb_clean_tx_ring(adapter);
891
892 vfree(adapter->tx_ring.buffer_info);
893 adapter->tx_ring.buffer_info = NULL;
894
895 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
896 adapter->tx_ring.desc, adapter->tx_ring.dma);
897
898 adapter->tx_ring.desc = NULL;
899 }
900
901 static void
902 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
903 struct ixgb_buffer *buffer_info)
904 {
905 if (buffer_info->dma) {
906 if (buffer_info->mapped_as_page)
907 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
908 buffer_info->length, DMA_TO_DEVICE);
909 else
910 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
911 buffer_info->length, DMA_TO_DEVICE);
912 buffer_info->dma = 0;
913 }
914
915 if (buffer_info->skb) {
916 dev_kfree_skb_any(buffer_info->skb);
917 buffer_info->skb = NULL;
918 }
919 buffer_info->time_stamp = 0;
920 /* these fields must always be initialized in tx
921 * buffer_info->length = 0;
922 * buffer_info->next_to_watch = 0; */
923 }
924
925 /**
926 * ixgb_clean_tx_ring - Free Tx Buffers
927 * @adapter: board private structure
928 **/
929
930 static void
931 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
932 {
933 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
934 struct ixgb_buffer *buffer_info;
935 unsigned long size;
936 unsigned int i;
937
938 /* Free all the Tx ring sk_buffs */
939
940 for (i = 0; i < tx_ring->count; i++) {
941 buffer_info = &tx_ring->buffer_info[i];
942 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
943 }
944
945 size = sizeof(struct ixgb_buffer) * tx_ring->count;
946 memset(tx_ring->buffer_info, 0, size);
947
948 /* Zero out the descriptor ring */
949
950 memset(tx_ring->desc, 0, tx_ring->size);
951
952 tx_ring->next_to_use = 0;
953 tx_ring->next_to_clean = 0;
954
955 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
956 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
957 }
958
959 /**
960 * ixgb_free_rx_resources - Free Rx Resources
961 * @adapter: board private structure
962 *
963 * Free all receive software resources
964 **/
965
966 void
967 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
968 {
969 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
970 struct pci_dev *pdev = adapter->pdev;
971
972 ixgb_clean_rx_ring(adapter);
973
974 vfree(rx_ring->buffer_info);
975 rx_ring->buffer_info = NULL;
976
977 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
978 rx_ring->dma);
979
980 rx_ring->desc = NULL;
981 }
982
983 /**
984 * ixgb_clean_rx_ring - Free Rx Buffers
985 * @adapter: board private structure
986 **/
987
988 static void
989 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
990 {
991 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
992 struct ixgb_buffer *buffer_info;
993 struct pci_dev *pdev = adapter->pdev;
994 unsigned long size;
995 unsigned int i;
996
997 /* Free all the Rx ring sk_buffs */
998
999 for (i = 0; i < rx_ring->count; i++) {
1000 buffer_info = &rx_ring->buffer_info[i];
1001 if (buffer_info->dma) {
1002 dma_unmap_single(&pdev->dev,
1003 buffer_info->dma,
1004 buffer_info->length,
1005 DMA_FROM_DEVICE);
1006 buffer_info->dma = 0;
1007 buffer_info->length = 0;
1008 }
1009
1010 if (buffer_info->skb) {
1011 dev_kfree_skb(buffer_info->skb);
1012 buffer_info->skb = NULL;
1013 }
1014 }
1015
1016 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1017 memset(rx_ring->buffer_info, 0, size);
1018
1019 /* Zero out the descriptor ring */
1020
1021 memset(rx_ring->desc, 0, rx_ring->size);
1022
1023 rx_ring->next_to_clean = 0;
1024 rx_ring->next_to_use = 0;
1025
1026 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1027 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1028 }
1029
1030 /**
1031 * ixgb_set_mac - Change the Ethernet Address of the NIC
1032 * @netdev: network interface device structure
1033 * @p: pointer to an address structure
1034 *
1035 * Returns 0 on success, negative on failure
1036 **/
1037
1038 static int
1039 ixgb_set_mac(struct net_device *netdev, void *p)
1040 {
1041 struct ixgb_adapter *adapter = netdev_priv(netdev);
1042 struct sockaddr *addr = p;
1043
1044 if (!is_valid_ether_addr(addr->sa_data))
1045 return -EADDRNOTAVAIL;
1046
1047 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1048
1049 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1050
1051 return 0;
1052 }
1053
1054 /**
1055 * ixgb_set_multi - Multicast and Promiscuous mode set
1056 * @netdev: network interface device structure
1057 *
1058 * The set_multi entry point is called whenever the multicast address
1059 * list or the network interface flags are updated. This routine is
1060 * responsible for configuring the hardware for proper multicast,
1061 * promiscuous mode, and all-multi behavior.
1062 **/
1063
1064 static void
1065 ixgb_set_multi(struct net_device *netdev)
1066 {
1067 struct ixgb_adapter *adapter = netdev_priv(netdev);
1068 struct ixgb_hw *hw = &adapter->hw;
1069 struct netdev_hw_addr *ha;
1070 u32 rctl;
1071 int i;
1072
1073 /* Check for Promiscuous and All Multicast modes */
1074
1075 rctl = IXGB_READ_REG(hw, RCTL);
1076
1077 if (netdev->flags & IFF_PROMISC) {
1078 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1079 /* disable VLAN filtering */
1080 rctl &= ~IXGB_RCTL_CFIEN;
1081 rctl &= ~IXGB_RCTL_VFE;
1082 } else {
1083 if (netdev->flags & IFF_ALLMULTI) {
1084 rctl |= IXGB_RCTL_MPE;
1085 rctl &= ~IXGB_RCTL_UPE;
1086 } else {
1087 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1088 }
1089 /* enable VLAN filtering */
1090 rctl |= IXGB_RCTL_VFE;
1091 rctl &= ~IXGB_RCTL_CFIEN;
1092 }
1093
1094 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1095 rctl |= IXGB_RCTL_MPE;
1096 IXGB_WRITE_REG(hw, RCTL, rctl);
1097 } else {
1098 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1099 IXGB_ETH_LENGTH_OF_ADDRESS];
1100
1101 IXGB_WRITE_REG(hw, RCTL, rctl);
1102
1103 i = 0;
1104 netdev_for_each_mc_addr(ha, netdev)
1105 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1106 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1107
1108 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1109 }
1110
1111 if (netdev->features & NETIF_F_HW_VLAN_RX)
1112 ixgb_vlan_strip_enable(adapter);
1113 else
1114 ixgb_vlan_strip_disable(adapter);
1115
1116 }
1117
1118 /**
1119 * ixgb_watchdog - Timer Call-back
1120 * @data: pointer to netdev cast into an unsigned long
1121 **/
1122
1123 static void
1124 ixgb_watchdog(unsigned long data)
1125 {
1126 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1127 struct net_device *netdev = adapter->netdev;
1128 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1129
1130 ixgb_check_for_link(&adapter->hw);
1131
1132 if (ixgb_check_for_bad_link(&adapter->hw)) {
1133 /* force the reset path */
1134 netif_stop_queue(netdev);
1135 }
1136
1137 if (adapter->hw.link_up) {
1138 if (!netif_carrier_ok(netdev)) {
1139 netdev_info(netdev,
1140 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1141 (adapter->hw.fc.type == ixgb_fc_full) ?
1142 "RX/TX" :
1143 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1144 "RX" :
1145 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1146 "TX" : "None");
1147 adapter->link_speed = 10000;
1148 adapter->link_duplex = FULL_DUPLEX;
1149 netif_carrier_on(netdev);
1150 }
1151 } else {
1152 if (netif_carrier_ok(netdev)) {
1153 adapter->link_speed = 0;
1154 adapter->link_duplex = 0;
1155 netdev_info(netdev, "NIC Link is Down\n");
1156 netif_carrier_off(netdev);
1157 }
1158 }
1159
1160 ixgb_update_stats(adapter);
1161
1162 if (!netif_carrier_ok(netdev)) {
1163 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1164 /* We've lost link, so the controller stops DMA,
1165 * but we've got queued Tx work that's never going
1166 * to get done, so reset controller to flush Tx.
1167 * (Do the reset outside of interrupt context). */
1168 schedule_work(&adapter->tx_timeout_task);
1169 /* return immediately since reset is imminent */
1170 return;
1171 }
1172 }
1173
1174 /* Force detection of hung controller every watchdog period */
1175 adapter->detect_tx_hung = true;
1176
1177 /* generate an interrupt to force clean up of any stragglers */
1178 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1179
1180 /* Reset the timer */
1181 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1182 }
1183
1184 #define IXGB_TX_FLAGS_CSUM 0x00000001
1185 #define IXGB_TX_FLAGS_VLAN 0x00000002
1186 #define IXGB_TX_FLAGS_TSO 0x00000004
1187
1188 static int
1189 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1190 {
1191 struct ixgb_context_desc *context_desc;
1192 unsigned int i;
1193 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1194 u16 ipcse, tucse, mss;
1195 int err;
1196
1197 if (likely(skb_is_gso(skb))) {
1198 struct ixgb_buffer *buffer_info;
1199 struct iphdr *iph;
1200
1201 if (skb_header_cloned(skb)) {
1202 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1203 if (err)
1204 return err;
1205 }
1206
1207 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1208 mss = skb_shinfo(skb)->gso_size;
1209 iph = ip_hdr(skb);
1210 iph->tot_len = 0;
1211 iph->check = 0;
1212 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1213 iph->daddr, 0,
1214 IPPROTO_TCP, 0);
1215 ipcss = skb_network_offset(skb);
1216 ipcso = (void *)&(iph->check) - (void *)skb->data;
1217 ipcse = skb_transport_offset(skb) - 1;
1218 tucss = skb_transport_offset(skb);
1219 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1220 tucse = 0;
1221
1222 i = adapter->tx_ring.next_to_use;
1223 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1224 buffer_info = &adapter->tx_ring.buffer_info[i];
1225 WARN_ON(buffer_info->dma != 0);
1226
1227 context_desc->ipcss = ipcss;
1228 context_desc->ipcso = ipcso;
1229 context_desc->ipcse = cpu_to_le16(ipcse);
1230 context_desc->tucss = tucss;
1231 context_desc->tucso = tucso;
1232 context_desc->tucse = cpu_to_le16(tucse);
1233 context_desc->mss = cpu_to_le16(mss);
1234 context_desc->hdr_len = hdr_len;
1235 context_desc->status = 0;
1236 context_desc->cmd_type_len = cpu_to_le32(
1237 IXGB_CONTEXT_DESC_TYPE
1238 | IXGB_CONTEXT_DESC_CMD_TSE
1239 | IXGB_CONTEXT_DESC_CMD_IP
1240 | IXGB_CONTEXT_DESC_CMD_TCP
1241 | IXGB_CONTEXT_DESC_CMD_IDE
1242 | (skb->len - (hdr_len)));
1243
1244
1245 if (++i == adapter->tx_ring.count) i = 0;
1246 adapter->tx_ring.next_to_use = i;
1247
1248 return 1;
1249 }
1250
1251 return 0;
1252 }
1253
1254 static bool
1255 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1256 {
1257 struct ixgb_context_desc *context_desc;
1258 unsigned int i;
1259 u8 css, cso;
1260
1261 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1262 struct ixgb_buffer *buffer_info;
1263 css = skb_checksum_start_offset(skb);
1264 cso = css + skb->csum_offset;
1265
1266 i = adapter->tx_ring.next_to_use;
1267 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1268 buffer_info = &adapter->tx_ring.buffer_info[i];
1269 WARN_ON(buffer_info->dma != 0);
1270
1271 context_desc->tucss = css;
1272 context_desc->tucso = cso;
1273 context_desc->tucse = 0;
1274 /* zero out any previously existing data in one instruction */
1275 *(u32 *)&(context_desc->ipcss) = 0;
1276 context_desc->status = 0;
1277 context_desc->hdr_len = 0;
1278 context_desc->mss = 0;
1279 context_desc->cmd_type_len =
1280 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1281 | IXGB_TX_DESC_CMD_IDE);
1282
1283 if (++i == adapter->tx_ring.count) i = 0;
1284 adapter->tx_ring.next_to_use = i;
1285
1286 return true;
1287 }
1288
1289 return false;
1290 }
1291
1292 #define IXGB_MAX_TXD_PWR 14
1293 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1294
1295 static int
1296 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1297 unsigned int first)
1298 {
1299 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1300 struct pci_dev *pdev = adapter->pdev;
1301 struct ixgb_buffer *buffer_info;
1302 int len = skb_headlen(skb);
1303 unsigned int offset = 0, size, count = 0, i;
1304 unsigned int mss = skb_shinfo(skb)->gso_size;
1305 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1306 unsigned int f;
1307
1308 i = tx_ring->next_to_use;
1309
1310 while (len) {
1311 buffer_info = &tx_ring->buffer_info[i];
1312 size = min(len, IXGB_MAX_DATA_PER_TXD);
1313 /* Workaround for premature desc write-backs
1314 * in TSO mode. Append 4-byte sentinel desc */
1315 if (unlikely(mss && !nr_frags && size == len && size > 8))
1316 size -= 4;
1317
1318 buffer_info->length = size;
1319 WARN_ON(buffer_info->dma != 0);
1320 buffer_info->time_stamp = jiffies;
1321 buffer_info->mapped_as_page = false;
1322 buffer_info->dma = dma_map_single(&pdev->dev,
1323 skb->data + offset,
1324 size, DMA_TO_DEVICE);
1325 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1326 goto dma_error;
1327 buffer_info->next_to_watch = 0;
1328
1329 len -= size;
1330 offset += size;
1331 count++;
1332 if (len) {
1333 i++;
1334 if (i == tx_ring->count)
1335 i = 0;
1336 }
1337 }
1338
1339 for (f = 0; f < nr_frags; f++) {
1340 struct skb_frag_struct *frag;
1341
1342 frag = &skb_shinfo(skb)->frags[f];
1343 len = frag->size;
1344 offset = 0;
1345
1346 while (len) {
1347 i++;
1348 if (i == tx_ring->count)
1349 i = 0;
1350
1351 buffer_info = &tx_ring->buffer_info[i];
1352 size = min(len, IXGB_MAX_DATA_PER_TXD);
1353
1354 /* Workaround for premature desc write-backs
1355 * in TSO mode. Append 4-byte sentinel desc */
1356 if (unlikely(mss && (f == (nr_frags - 1))
1357 && size == len && size > 8))
1358 size -= 4;
1359
1360 buffer_info->length = size;
1361 buffer_info->time_stamp = jiffies;
1362 buffer_info->mapped_as_page = true;
1363 buffer_info->dma =
1364 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1365 DMA_TO_DEVICE);
1366 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1367 goto dma_error;
1368 buffer_info->next_to_watch = 0;
1369
1370 len -= size;
1371 offset += size;
1372 count++;
1373 }
1374 }
1375 tx_ring->buffer_info[i].skb = skb;
1376 tx_ring->buffer_info[first].next_to_watch = i;
1377
1378 return count;
1379
1380 dma_error:
1381 dev_err(&pdev->dev, "TX DMA map failed\n");
1382 buffer_info->dma = 0;
1383 if (count)
1384 count--;
1385
1386 while (count--) {
1387 if (i==0)
1388 i += tx_ring->count;
1389 i--;
1390 buffer_info = &tx_ring->buffer_info[i];
1391 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1392 }
1393
1394 return 0;
1395 }
1396
1397 static void
1398 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1399 {
1400 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1401 struct ixgb_tx_desc *tx_desc = NULL;
1402 struct ixgb_buffer *buffer_info;
1403 u32 cmd_type_len = adapter->tx_cmd_type;
1404 u8 status = 0;
1405 u8 popts = 0;
1406 unsigned int i;
1407
1408 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1409 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1410 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1411 }
1412
1413 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1414 popts |= IXGB_TX_DESC_POPTS_TXSM;
1415
1416 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1417 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1418
1419 i = tx_ring->next_to_use;
1420
1421 while (count--) {
1422 buffer_info = &tx_ring->buffer_info[i];
1423 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1424 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1425 tx_desc->cmd_type_len =
1426 cpu_to_le32(cmd_type_len | buffer_info->length);
1427 tx_desc->status = status;
1428 tx_desc->popts = popts;
1429 tx_desc->vlan = cpu_to_le16(vlan_id);
1430
1431 if (++i == tx_ring->count) i = 0;
1432 }
1433
1434 tx_desc->cmd_type_len |=
1435 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1436
1437 /* Force memory writes to complete before letting h/w
1438 * know there are new descriptors to fetch. (Only
1439 * applicable for weak-ordered memory model archs,
1440 * such as IA-64). */
1441 wmb();
1442
1443 tx_ring->next_to_use = i;
1444 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1445 }
1446
1447 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1448 {
1449 struct ixgb_adapter *adapter = netdev_priv(netdev);
1450 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1451
1452 netif_stop_queue(netdev);
1453 /* Herbert's original patch had:
1454 * smp_mb__after_netif_stop_queue();
1455 * but since that doesn't exist yet, just open code it. */
1456 smp_mb();
1457
1458 /* We need to check again in a case another CPU has just
1459 * made room available. */
1460 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1461 return -EBUSY;
1462
1463 /* A reprieve! */
1464 netif_start_queue(netdev);
1465 ++adapter->restart_queue;
1466 return 0;
1467 }
1468
1469 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1470 struct ixgb_desc_ring *tx_ring, int size)
1471 {
1472 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1473 return 0;
1474 return __ixgb_maybe_stop_tx(netdev, size);
1475 }
1476
1477
1478 /* Tx Descriptors needed, worst case */
1479 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1480 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1481 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1482 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1483 + 1 /* one more needed for sentinel TSO workaround */
1484
1485 static netdev_tx_t
1486 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1487 {
1488 struct ixgb_adapter *adapter = netdev_priv(netdev);
1489 unsigned int first;
1490 unsigned int tx_flags = 0;
1491 int vlan_id = 0;
1492 int count = 0;
1493 int tso;
1494
1495 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1496 dev_kfree_skb(skb);
1497 return NETDEV_TX_OK;
1498 }
1499
1500 if (skb->len <= 0) {
1501 dev_kfree_skb(skb);
1502 return NETDEV_TX_OK;
1503 }
1504
1505 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1506 DESC_NEEDED)))
1507 return NETDEV_TX_BUSY;
1508
1509 if (vlan_tx_tag_present(skb)) {
1510 tx_flags |= IXGB_TX_FLAGS_VLAN;
1511 vlan_id = vlan_tx_tag_get(skb);
1512 }
1513
1514 first = adapter->tx_ring.next_to_use;
1515
1516 tso = ixgb_tso(adapter, skb);
1517 if (tso < 0) {
1518 dev_kfree_skb(skb);
1519 return NETDEV_TX_OK;
1520 }
1521
1522 if (likely(tso))
1523 tx_flags |= IXGB_TX_FLAGS_TSO;
1524 else if (ixgb_tx_csum(adapter, skb))
1525 tx_flags |= IXGB_TX_FLAGS_CSUM;
1526
1527 count = ixgb_tx_map(adapter, skb, first);
1528
1529 if (count) {
1530 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1531 /* Make sure there is space in the ring for the next send. */
1532 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1533
1534 } else {
1535 dev_kfree_skb_any(skb);
1536 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1537 adapter->tx_ring.next_to_use = first;
1538 }
1539
1540 return NETDEV_TX_OK;
1541 }
1542
1543 /**
1544 * ixgb_tx_timeout - Respond to a Tx Hang
1545 * @netdev: network interface device structure
1546 **/
1547
1548 static void
1549 ixgb_tx_timeout(struct net_device *netdev)
1550 {
1551 struct ixgb_adapter *adapter = netdev_priv(netdev);
1552
1553 /* Do the reset outside of interrupt context */
1554 schedule_work(&adapter->tx_timeout_task);
1555 }
1556
1557 static void
1558 ixgb_tx_timeout_task(struct work_struct *work)
1559 {
1560 struct ixgb_adapter *adapter =
1561 container_of(work, struct ixgb_adapter, tx_timeout_task);
1562
1563 adapter->tx_timeout_count++;
1564 ixgb_down(adapter, true);
1565 ixgb_up(adapter);
1566 }
1567
1568 /**
1569 * ixgb_get_stats - Get System Network Statistics
1570 * @netdev: network interface device structure
1571 *
1572 * Returns the address of the device statistics structure.
1573 * The statistics are actually updated from the timer callback.
1574 **/
1575
1576 static struct net_device_stats *
1577 ixgb_get_stats(struct net_device *netdev)
1578 {
1579 return &netdev->stats;
1580 }
1581
1582 /**
1583 * ixgb_change_mtu - Change the Maximum Transfer Unit
1584 * @netdev: network interface device structure
1585 * @new_mtu: new value for maximum frame size
1586 *
1587 * Returns 0 on success, negative on failure
1588 **/
1589
1590 static int
1591 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1592 {
1593 struct ixgb_adapter *adapter = netdev_priv(netdev);
1594 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1595 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1596
1597 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1598 if ((new_mtu < 68) ||
1599 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1600 netif_err(adapter, probe, adapter->netdev,
1601 "Invalid MTU setting %d\n", new_mtu);
1602 return -EINVAL;
1603 }
1604
1605 if (old_max_frame == max_frame)
1606 return 0;
1607
1608 if (netif_running(netdev))
1609 ixgb_down(adapter, true);
1610
1611 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1612
1613 netdev->mtu = new_mtu;
1614
1615 if (netif_running(netdev))
1616 ixgb_up(adapter);
1617
1618 return 0;
1619 }
1620
1621 /**
1622 * ixgb_update_stats - Update the board statistics counters.
1623 * @adapter: board private structure
1624 **/
1625
1626 void
1627 ixgb_update_stats(struct ixgb_adapter *adapter)
1628 {
1629 struct net_device *netdev = adapter->netdev;
1630 struct pci_dev *pdev = adapter->pdev;
1631
1632 /* Prevent stats update while adapter is being reset */
1633 if (pci_channel_offline(pdev))
1634 return;
1635
1636 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1637 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1638 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1639 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1640 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1641 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1642
1643 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1644 /* fix up multicast stats by removing broadcasts */
1645 if (multi >= bcast)
1646 multi -= bcast;
1647
1648 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1649 adapter->stats.mprch += (multi >> 32);
1650 adapter->stats.bprcl += bcast_l;
1651 adapter->stats.bprch += bcast_h;
1652 } else {
1653 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1654 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1655 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1656 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1657 }
1658 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1659 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1660 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1661 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1662 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1663 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1664 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1665 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1666 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1667 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1668 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1669 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1670 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1671 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1672 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1673 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1674 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1675 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1676 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1677 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1678 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1679 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1680 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1681 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1682 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1683 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1684 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1685 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1686 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1687 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1688 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1689 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1690 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1691 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1692 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1693 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1694 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1695 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1696 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1697 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1698 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1699 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1700 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1701 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1702 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1703 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1704 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1705 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1706 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1707 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1708 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1709 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1710 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1711 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1712 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1713 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1714
1715 /* Fill out the OS statistics structure */
1716
1717 netdev->stats.rx_packets = adapter->stats.gprcl;
1718 netdev->stats.tx_packets = adapter->stats.gptcl;
1719 netdev->stats.rx_bytes = adapter->stats.gorcl;
1720 netdev->stats.tx_bytes = adapter->stats.gotcl;
1721 netdev->stats.multicast = adapter->stats.mprcl;
1722 netdev->stats.collisions = 0;
1723
1724 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1725 * with a length in the type/len field */
1726 netdev->stats.rx_errors =
1727 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1728 adapter->stats.ruc +
1729 adapter->stats.roc /*+ adapter->stats.rlec */ +
1730 adapter->stats.icbc +
1731 adapter->stats.ecbc + adapter->stats.mpc;
1732
1733 /* see above
1734 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1735 */
1736
1737 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1738 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1739 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1740 netdev->stats.rx_over_errors = adapter->stats.mpc;
1741
1742 netdev->stats.tx_errors = 0;
1743 netdev->stats.rx_frame_errors = 0;
1744 netdev->stats.tx_aborted_errors = 0;
1745 netdev->stats.tx_carrier_errors = 0;
1746 netdev->stats.tx_fifo_errors = 0;
1747 netdev->stats.tx_heartbeat_errors = 0;
1748 netdev->stats.tx_window_errors = 0;
1749 }
1750
1751 #define IXGB_MAX_INTR 10
1752 /**
1753 * ixgb_intr - Interrupt Handler
1754 * @irq: interrupt number
1755 * @data: pointer to a network interface device structure
1756 **/
1757
1758 static irqreturn_t
1759 ixgb_intr(int irq, void *data)
1760 {
1761 struct net_device *netdev = data;
1762 struct ixgb_adapter *adapter = netdev_priv(netdev);
1763 struct ixgb_hw *hw = &adapter->hw;
1764 u32 icr = IXGB_READ_REG(hw, ICR);
1765
1766 if (unlikely(!icr))
1767 return IRQ_NONE; /* Not our interrupt */
1768
1769 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1770 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1771 mod_timer(&adapter->watchdog_timer, jiffies);
1772
1773 if (napi_schedule_prep(&adapter->napi)) {
1774
1775 /* Disable interrupts and register for poll. The flush
1776 of the posted write is intentionally left out.
1777 */
1778
1779 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1780 __napi_schedule(&adapter->napi);
1781 }
1782 return IRQ_HANDLED;
1783 }
1784
1785 /**
1786 * ixgb_clean - NAPI Rx polling callback
1787 * @adapter: board private structure
1788 **/
1789
1790 static int
1791 ixgb_clean(struct napi_struct *napi, int budget)
1792 {
1793 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1794 int work_done = 0;
1795
1796 ixgb_clean_tx_irq(adapter);
1797 ixgb_clean_rx_irq(adapter, &work_done, budget);
1798
1799 /* If budget not fully consumed, exit the polling mode */
1800 if (work_done < budget) {
1801 napi_complete(napi);
1802 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1803 ixgb_irq_enable(adapter);
1804 }
1805
1806 return work_done;
1807 }
1808
1809 /**
1810 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1811 * @adapter: board private structure
1812 **/
1813
1814 static bool
1815 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1816 {
1817 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1818 struct net_device *netdev = adapter->netdev;
1819 struct ixgb_tx_desc *tx_desc, *eop_desc;
1820 struct ixgb_buffer *buffer_info;
1821 unsigned int i, eop;
1822 bool cleaned = false;
1823
1824 i = tx_ring->next_to_clean;
1825 eop = tx_ring->buffer_info[i].next_to_watch;
1826 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1827
1828 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1829
1830 rmb(); /* read buffer_info after eop_desc */
1831 for (cleaned = false; !cleaned; ) {
1832 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1833 buffer_info = &tx_ring->buffer_info[i];
1834
1835 if (tx_desc->popts &
1836 (IXGB_TX_DESC_POPTS_TXSM |
1837 IXGB_TX_DESC_POPTS_IXSM))
1838 adapter->hw_csum_tx_good++;
1839
1840 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1841
1842 *(u32 *)&(tx_desc->status) = 0;
1843
1844 cleaned = (i == eop);
1845 if (++i == tx_ring->count) i = 0;
1846 }
1847
1848 eop = tx_ring->buffer_info[i].next_to_watch;
1849 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1850 }
1851
1852 tx_ring->next_to_clean = i;
1853
1854 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1855 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1856 /* Make sure that anybody stopping the queue after this
1857 * sees the new next_to_clean. */
1858 smp_mb();
1859
1860 if (netif_queue_stopped(netdev) &&
1861 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1862 netif_wake_queue(netdev);
1863 ++adapter->restart_queue;
1864 }
1865 }
1866
1867 if (adapter->detect_tx_hung) {
1868 /* detect a transmit hang in hardware, this serializes the
1869 * check with the clearing of time_stamp and movement of i */
1870 adapter->detect_tx_hung = false;
1871 if (tx_ring->buffer_info[eop].time_stamp &&
1872 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1873 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1874 IXGB_STATUS_TXOFF)) {
1875 /* detected Tx unit hang */
1876 netif_err(adapter, drv, adapter->netdev,
1877 "Detected Tx Unit Hang\n"
1878 " TDH <%x>\n"
1879 " TDT <%x>\n"
1880 " next_to_use <%x>\n"
1881 " next_to_clean <%x>\n"
1882 "buffer_info[next_to_clean]\n"
1883 " time_stamp <%lx>\n"
1884 " next_to_watch <%x>\n"
1885 " jiffies <%lx>\n"
1886 " next_to_watch.status <%x>\n",
1887 IXGB_READ_REG(&adapter->hw, TDH),
1888 IXGB_READ_REG(&adapter->hw, TDT),
1889 tx_ring->next_to_use,
1890 tx_ring->next_to_clean,
1891 tx_ring->buffer_info[eop].time_stamp,
1892 eop,
1893 jiffies,
1894 eop_desc->status);
1895 netif_stop_queue(netdev);
1896 }
1897 }
1898
1899 return cleaned;
1900 }
1901
1902 /**
1903 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1904 * @adapter: board private structure
1905 * @rx_desc: receive descriptor
1906 * @sk_buff: socket buffer with received data
1907 **/
1908
1909 static void
1910 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1911 struct ixgb_rx_desc *rx_desc,
1912 struct sk_buff *skb)
1913 {
1914 /* Ignore Checksum bit is set OR
1915 * TCP Checksum has not been calculated
1916 */
1917 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1918 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1919 skb_checksum_none_assert(skb);
1920 return;
1921 }
1922
1923 /* At this point we know the hardware did the TCP checksum */
1924 /* now look at the TCP checksum error bit */
1925 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1926 /* let the stack verify checksum errors */
1927 skb_checksum_none_assert(skb);
1928 adapter->hw_csum_rx_error++;
1929 } else {
1930 /* TCP checksum is good */
1931 skb->ip_summed = CHECKSUM_UNNECESSARY;
1932 adapter->hw_csum_rx_good++;
1933 }
1934 }
1935
1936 /*
1937 * this should improve performance for small packets with large amounts
1938 * of reassembly being done in the stack
1939 */
1940 static void ixgb_check_copybreak(struct net_device *netdev,
1941 struct ixgb_buffer *buffer_info,
1942 u32 length, struct sk_buff **skb)
1943 {
1944 struct sk_buff *new_skb;
1945
1946 if (length > copybreak)
1947 return;
1948
1949 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1950 if (!new_skb)
1951 return;
1952
1953 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1954 (*skb)->data - NET_IP_ALIGN,
1955 length + NET_IP_ALIGN);
1956 /* save the skb in buffer_info as good */
1957 buffer_info->skb = *skb;
1958 *skb = new_skb;
1959 }
1960
1961 /**
1962 * ixgb_clean_rx_irq - Send received data up the network stack,
1963 * @adapter: board private structure
1964 **/
1965
1966 static bool
1967 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1968 {
1969 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1970 struct net_device *netdev = adapter->netdev;
1971 struct pci_dev *pdev = adapter->pdev;
1972 struct ixgb_rx_desc *rx_desc, *next_rxd;
1973 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1974 u32 length;
1975 unsigned int i, j;
1976 int cleaned_count = 0;
1977 bool cleaned = false;
1978
1979 i = rx_ring->next_to_clean;
1980 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1981 buffer_info = &rx_ring->buffer_info[i];
1982
1983 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1984 struct sk_buff *skb;
1985 u8 status;
1986
1987 if (*work_done >= work_to_do)
1988 break;
1989
1990 (*work_done)++;
1991 rmb(); /* read descriptor and rx_buffer_info after status DD */
1992 status = rx_desc->status;
1993 skb = buffer_info->skb;
1994 buffer_info->skb = NULL;
1995
1996 prefetch(skb->data - NET_IP_ALIGN);
1997
1998 if (++i == rx_ring->count)
1999 i = 0;
2000 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2001 prefetch(next_rxd);
2002
2003 j = i + 1;
2004 if (j == rx_ring->count)
2005 j = 0;
2006 next2_buffer = &rx_ring->buffer_info[j];
2007 prefetch(next2_buffer);
2008
2009 next_buffer = &rx_ring->buffer_info[i];
2010
2011 cleaned = true;
2012 cleaned_count++;
2013
2014 dma_unmap_single(&pdev->dev,
2015 buffer_info->dma,
2016 buffer_info->length,
2017 DMA_FROM_DEVICE);
2018 buffer_info->dma = 0;
2019
2020 length = le16_to_cpu(rx_desc->length);
2021 rx_desc->length = 0;
2022
2023 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2024
2025 /* All receives must fit into a single buffer */
2026
2027 IXGB_DBG("Receive packet consumed multiple buffers "
2028 "length<%x>\n", length);
2029
2030 dev_kfree_skb_irq(skb);
2031 goto rxdesc_done;
2032 }
2033
2034 if (unlikely(rx_desc->errors &
2035 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2036 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2037 dev_kfree_skb_irq(skb);
2038 goto rxdesc_done;
2039 }
2040
2041 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2042
2043 /* Good Receive */
2044 skb_put(skb, length);
2045
2046 /* Receive Checksum Offload */
2047 ixgb_rx_checksum(adapter, rx_desc, skb);
2048
2049 skb->protocol = eth_type_trans(skb, netdev);
2050 if (status & IXGB_RX_DESC_STATUS_VP)
2051 __vlan_hwaccel_put_tag(skb,
2052 le16_to_cpu(rx_desc->special));
2053
2054 netif_receive_skb(skb);
2055
2056 rxdesc_done:
2057 /* clean up descriptor, might be written over by hw */
2058 rx_desc->status = 0;
2059
2060 /* return some buffers to hardware, one at a time is too slow */
2061 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2062 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2063 cleaned_count = 0;
2064 }
2065
2066 /* use prefetched values */
2067 rx_desc = next_rxd;
2068 buffer_info = next_buffer;
2069 }
2070
2071 rx_ring->next_to_clean = i;
2072
2073 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2074 if (cleaned_count)
2075 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2076
2077 return cleaned;
2078 }
2079
2080 /**
2081 * ixgb_alloc_rx_buffers - Replace used receive buffers
2082 * @adapter: address of board private structure
2083 **/
2084
2085 static void
2086 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2087 {
2088 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2089 struct net_device *netdev = adapter->netdev;
2090 struct pci_dev *pdev = adapter->pdev;
2091 struct ixgb_rx_desc *rx_desc;
2092 struct ixgb_buffer *buffer_info;
2093 struct sk_buff *skb;
2094 unsigned int i;
2095 long cleancount;
2096
2097 i = rx_ring->next_to_use;
2098 buffer_info = &rx_ring->buffer_info[i];
2099 cleancount = IXGB_DESC_UNUSED(rx_ring);
2100
2101
2102 /* leave three descriptors unused */
2103 while (--cleancount > 2 && cleaned_count--) {
2104 /* recycle! its good for you */
2105 skb = buffer_info->skb;
2106 if (skb) {
2107 skb_trim(skb, 0);
2108 goto map_skb;
2109 }
2110
2111 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2112 if (unlikely(!skb)) {
2113 /* Better luck next round */
2114 adapter->alloc_rx_buff_failed++;
2115 break;
2116 }
2117
2118 buffer_info->skb = skb;
2119 buffer_info->length = adapter->rx_buffer_len;
2120 map_skb:
2121 buffer_info->dma = dma_map_single(&pdev->dev,
2122 skb->data,
2123 adapter->rx_buffer_len,
2124 DMA_FROM_DEVICE);
2125
2126 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2127 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2128 /* guarantee DD bit not set now before h/w gets descriptor
2129 * this is the rest of the workaround for h/w double
2130 * writeback. */
2131 rx_desc->status = 0;
2132
2133
2134 if (++i == rx_ring->count) i = 0;
2135 buffer_info = &rx_ring->buffer_info[i];
2136 }
2137
2138 if (likely(rx_ring->next_to_use != i)) {
2139 rx_ring->next_to_use = i;
2140 if (unlikely(i-- == 0))
2141 i = (rx_ring->count - 1);
2142
2143 /* Force memory writes to complete before letting h/w
2144 * know there are new descriptors to fetch. (Only
2145 * applicable for weak-ordered memory model archs, such
2146 * as IA-64). */
2147 wmb();
2148 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2149 }
2150 }
2151
2152 static void
2153 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2154 {
2155 u32 ctrl;
2156
2157 /* enable VLAN tag insert/strip */
2158 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2159 ctrl |= IXGB_CTRL0_VME;
2160 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2161 }
2162
2163 static void
2164 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2165 {
2166 u32 ctrl;
2167
2168 /* disable VLAN tag insert/strip */
2169 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170 ctrl &= ~IXGB_CTRL0_VME;
2171 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172 }
2173
2174 static void
2175 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2176 {
2177 struct ixgb_adapter *adapter = netdev_priv(netdev);
2178 u32 vfta, index;
2179
2180 /* add VID to filter table */
2181
2182 index = (vid >> 5) & 0x7F;
2183 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2184 vfta |= (1 << (vid & 0x1F));
2185 ixgb_write_vfta(&adapter->hw, index, vfta);
2186 set_bit(vid, adapter->active_vlans);
2187 }
2188
2189 static void
2190 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2191 {
2192 struct ixgb_adapter *adapter = netdev_priv(netdev);
2193 u32 vfta, index;
2194
2195 /* remove VID from filter table */
2196
2197 index = (vid >> 5) & 0x7F;
2198 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2199 vfta &= ~(1 << (vid & 0x1F));
2200 ixgb_write_vfta(&adapter->hw, index, vfta);
2201 clear_bit(vid, adapter->active_vlans);
2202 }
2203
2204 static void
2205 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2206 {
2207 u16 vid;
2208
2209 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2210 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2211 }
2212
2213 #ifdef CONFIG_NET_POLL_CONTROLLER
2214 /*
2215 * Polling 'interrupt' - used by things like netconsole to send skbs
2216 * without having to re-enable interrupts. It's not called while
2217 * the interrupt routine is executing.
2218 */
2219
2220 static void ixgb_netpoll(struct net_device *dev)
2221 {
2222 struct ixgb_adapter *adapter = netdev_priv(dev);
2223
2224 disable_irq(adapter->pdev->irq);
2225 ixgb_intr(adapter->pdev->irq, dev);
2226 enable_irq(adapter->pdev->irq);
2227 }
2228 #endif
2229
2230 /**
2231 * ixgb_io_error_detected() - called when PCI error is detected
2232 * @pdev pointer to pci device with error
2233 * @state pci channel state after error
2234 *
2235 * This callback is called by the PCI subsystem whenever
2236 * a PCI bus error is detected.
2237 */
2238 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2239 enum pci_channel_state state)
2240 {
2241 struct net_device *netdev = pci_get_drvdata(pdev);
2242 struct ixgb_adapter *adapter = netdev_priv(netdev);
2243
2244 netif_device_detach(netdev);
2245
2246 if (state == pci_channel_io_perm_failure)
2247 return PCI_ERS_RESULT_DISCONNECT;
2248
2249 if (netif_running(netdev))
2250 ixgb_down(adapter, true);
2251
2252 pci_disable_device(pdev);
2253
2254 /* Request a slot reset. */
2255 return PCI_ERS_RESULT_NEED_RESET;
2256 }
2257
2258 /**
2259 * ixgb_io_slot_reset - called after the pci bus has been reset.
2260 * @pdev pointer to pci device with error
2261 *
2262 * This callback is called after the PCI bus has been reset.
2263 * Basically, this tries to restart the card from scratch.
2264 * This is a shortened version of the device probe/discovery code,
2265 * it resembles the first-half of the ixgb_probe() routine.
2266 */
2267 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2268 {
2269 struct net_device *netdev = pci_get_drvdata(pdev);
2270 struct ixgb_adapter *adapter = netdev_priv(netdev);
2271
2272 if (pci_enable_device(pdev)) {
2273 netif_err(adapter, probe, adapter->netdev,
2274 "Cannot re-enable PCI device after reset\n");
2275 return PCI_ERS_RESULT_DISCONNECT;
2276 }
2277
2278 /* Perform card reset only on one instance of the card */
2279 if (0 != PCI_FUNC (pdev->devfn))
2280 return PCI_ERS_RESULT_RECOVERED;
2281
2282 pci_set_master(pdev);
2283
2284 netif_carrier_off(netdev);
2285 netif_stop_queue(netdev);
2286 ixgb_reset(adapter);
2287
2288 /* Make sure the EEPROM is good */
2289 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2290 netif_err(adapter, probe, adapter->netdev,
2291 "After reset, the EEPROM checksum is not valid\n");
2292 return PCI_ERS_RESULT_DISCONNECT;
2293 }
2294 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2295 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2296
2297 if (!is_valid_ether_addr(netdev->perm_addr)) {
2298 netif_err(adapter, probe, adapter->netdev,
2299 "After reset, invalid MAC address\n");
2300 return PCI_ERS_RESULT_DISCONNECT;
2301 }
2302
2303 return PCI_ERS_RESULT_RECOVERED;
2304 }
2305
2306 /**
2307 * ixgb_io_resume - called when its OK to resume normal operations
2308 * @pdev pointer to pci device with error
2309 *
2310 * The error recovery driver tells us that its OK to resume
2311 * normal operation. Implementation resembles the second-half
2312 * of the ixgb_probe() routine.
2313 */
2314 static void ixgb_io_resume(struct pci_dev *pdev)
2315 {
2316 struct net_device *netdev = pci_get_drvdata(pdev);
2317 struct ixgb_adapter *adapter = netdev_priv(netdev);
2318
2319 pci_set_master(pdev);
2320
2321 if (netif_running(netdev)) {
2322 if (ixgb_up(adapter)) {
2323 pr_err("can't bring device back up after reset\n");
2324 return;
2325 }
2326 }
2327
2328 netif_device_attach(netdev);
2329 mod_timer(&adapter->watchdog_timer, jiffies);
2330 }
2331
2332 /* ixgb_main.c */
linux-next