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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / net / ixgb / ixgb_main.c
blob0f681ac2da8dc54e721ad5565ecee38f46b3a092
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_strip_enable(struct ixgb_adapter *adapter);
102 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
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_add_vid = ixgb_vlan_rx_add_vid,
338 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
339 #ifdef CONFIG_NET_POLL_CONTROLLER
340 .ndo_poll_controller = ixgb_netpoll,
341 #endif
342 };
343
344 /**
345 * ixgb_probe - Device Initialization Routine
346 * @pdev: PCI device information struct
347 * @ent: entry in ixgb_pci_tbl
348 *
349 * Returns 0 on success, negative on failure
350 *
351 * ixgb_probe initializes an adapter identified by a pci_dev structure.
352 * The OS initialization, configuring of the adapter private structure,
353 * and a hardware reset occur.
354 **/
355
356 static int __devinit
357 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
358 {
359 struct net_device *netdev = NULL;
360 struct ixgb_adapter *adapter;
361 static int cards_found = 0;
362 int pci_using_dac;
363 int i;
364 int err;
365
366 err = pci_enable_device(pdev);
367 if (err)
368 return err;
369
370 pci_using_dac = 0;
371 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
372 if (!err) {
373 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
374 if (!err)
375 pci_using_dac = 1;
376 } else {
377 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
378 if (err) {
379 err = dma_set_coherent_mask(&pdev->dev,
380 DMA_BIT_MASK(32));
381 if (err) {
382 pr_err("No usable DMA configuration, aborting\n");
383 goto err_dma_mask;
384 }
385 }
386 }
387
388 err = pci_request_regions(pdev, ixgb_driver_name);
389 if (err)
390 goto err_request_regions;
391
392 pci_set_master(pdev);
393
394 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
395 if (!netdev) {
396 err = -ENOMEM;
397 goto err_alloc_etherdev;
398 }
399
400 SET_NETDEV_DEV(netdev, &pdev->dev);
401
402 pci_set_drvdata(pdev, netdev);
403 adapter = netdev_priv(netdev);
404 adapter->netdev = netdev;
405 adapter->pdev = pdev;
406 adapter->hw.back = adapter;
407 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
408
409 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
410 if (!adapter->hw.hw_addr) {
411 err = -EIO;
412 goto err_ioremap;
413 }
414
415 for (i = BAR_1; i <= BAR_5; i++) {
416 if (pci_resource_len(pdev, i) == 0)
417 continue;
418 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
419 adapter->hw.io_base = pci_resource_start(pdev, i);
420 break;
421 }
422 }
423
424 netdev->netdev_ops = &ixgb_netdev_ops;
425 ixgb_set_ethtool_ops(netdev);
426 netdev->watchdog_timeo = 5 * HZ;
427 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
428
429 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
430
431 adapter->bd_number = cards_found;
432 adapter->link_speed = 0;
433 adapter->link_duplex = 0;
434
435 /* setup the private structure */
436
437 err = ixgb_sw_init(adapter);
438 if (err)
439 goto err_sw_init;
440
441 netdev->features = NETIF_F_SG |
442 NETIF_F_HW_CSUM |
443 NETIF_F_HW_VLAN_TX |
444 NETIF_F_HW_VLAN_RX |
445 NETIF_F_HW_VLAN_FILTER;
446 netdev->features |= NETIF_F_TSO;
447
448 if (pci_using_dac) {
449 netdev->features |= NETIF_F_HIGHDMA;
450 netdev->vlan_features |= NETIF_F_HIGHDMA;
451 }
452
453 /* make sure the EEPROM is good */
454
455 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
456 netif_err(adapter, probe, adapter->netdev,
457 "The EEPROM Checksum Is Not Valid\n");
458 err = -EIO;
459 goto err_eeprom;
460 }
461
462 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
463 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
464
465 if (!is_valid_ether_addr(netdev->perm_addr)) {
466 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
467 err = -EIO;
468 goto err_eeprom;
469 }
470
471 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
472
473 init_timer(&adapter->watchdog_timer);
474 adapter->watchdog_timer.function = ixgb_watchdog;
475 adapter->watchdog_timer.data = (unsigned long)adapter;
476
477 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
478
479 strcpy(netdev->name, "eth%d");
480 err = register_netdev(netdev);
481 if (err)
482 goto err_register;
483
484 /* carrier off reporting is important to ethtool even BEFORE open */
485 netif_carrier_off(netdev);
486
487 netif_info(adapter, probe, adapter->netdev,
488 "Intel(R) PRO/10GbE Network Connection\n");
489 ixgb_check_options(adapter);
490 /* reset the hardware with the new settings */
491
492 ixgb_reset(adapter);
493
494 cards_found++;
495 return 0;
496
497 err_register:
498 err_sw_init:
499 err_eeprom:
500 iounmap(adapter->hw.hw_addr);
501 err_ioremap:
502 free_netdev(netdev);
503 err_alloc_etherdev:
504 pci_release_regions(pdev);
505 err_request_regions:
506 err_dma_mask:
507 pci_disable_device(pdev);
508 return err;
509 }
510
511 /**
512 * ixgb_remove - Device Removal Routine
513 * @pdev: PCI device information struct
514 *
515 * ixgb_remove is called by the PCI subsystem to alert the driver
516 * that it should release a PCI device. The could be caused by a
517 * Hot-Plug event, or because the driver is going to be removed from
518 * memory.
519 **/
520
521 static void __devexit
522 ixgb_remove(struct pci_dev *pdev)
523 {
524 struct net_device *netdev = pci_get_drvdata(pdev);
525 struct ixgb_adapter *adapter = netdev_priv(netdev);
526
527 cancel_work_sync(&adapter->tx_timeout_task);
528
529 unregister_netdev(netdev);
530
531 iounmap(adapter->hw.hw_addr);
532 pci_release_regions(pdev);
533
534 free_netdev(netdev);
535 pci_disable_device(pdev);
536 }
537
538 /**
539 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
540 * @adapter: board private structure to initialize
541 *
542 * ixgb_sw_init initializes the Adapter private data structure.
543 * Fields are initialized based on PCI device information and
544 * OS network device settings (MTU size).
545 **/
546
547 static int __devinit
548 ixgb_sw_init(struct ixgb_adapter *adapter)
549 {
550 struct ixgb_hw *hw = &adapter->hw;
551 struct net_device *netdev = adapter->netdev;
552 struct pci_dev *pdev = adapter->pdev;
553
554 /* PCI config space info */
555
556 hw->vendor_id = pdev->vendor;
557 hw->device_id = pdev->device;
558 hw->subsystem_vendor_id = pdev->subsystem_vendor;
559 hw->subsystem_id = pdev->subsystem_device;
560
561 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
562 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
563
564 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
565 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
566 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
567 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
568 hw->mac_type = ixgb_82597;
569 else {
570 /* should never have loaded on this device */
571 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
572 }
573
574 /* enable flow control to be programmed */
575 hw->fc.send_xon = 1;
576
577 set_bit(__IXGB_DOWN, &adapter->flags);
578 return 0;
579 }
580
581 /**
582 * ixgb_open - Called when a network interface is made active
583 * @netdev: network interface device structure
584 *
585 * Returns 0 on success, negative value on failure
586 *
587 * The open entry point is called when a network interface is made
588 * active by the system (IFF_UP). At this point all resources needed
589 * for transmit and receive operations are allocated, the interrupt
590 * handler is registered with the OS, the watchdog timer is started,
591 * and the stack is notified that the interface is ready.
592 **/
593
594 static int
595 ixgb_open(struct net_device *netdev)
596 {
597 struct ixgb_adapter *adapter = netdev_priv(netdev);
598 int err;
599
600 /* allocate transmit descriptors */
601 err = ixgb_setup_tx_resources(adapter);
602 if (err)
603 goto err_setup_tx;
604
605 netif_carrier_off(netdev);
606
607 /* allocate receive descriptors */
608
609 err = ixgb_setup_rx_resources(adapter);
610 if (err)
611 goto err_setup_rx;
612
613 err = ixgb_up(adapter);
614 if (err)
615 goto err_up;
616
617 netif_start_queue(netdev);
618
619 return 0;
620
621 err_up:
622 ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624 ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626 ixgb_reset(adapter);
627
628 return err;
629 }
630
631 /**
632 * ixgb_close - Disables a network interface
633 * @netdev: network interface device structure
634 *
635 * Returns 0, this is not allowed to fail
636 *
637 * The close entry point is called when an interface is de-activated
638 * by the OS. The hardware is still under the drivers control, but
639 * needs to be disabled. A global MAC reset is issued to stop the
640 * hardware, and all transmit and receive resources are freed.
641 **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646 struct ixgb_adapter *adapter = netdev_priv(netdev);
647
648 ixgb_down(adapter, true);
649
650 ixgb_free_tx_resources(adapter);
651 ixgb_free_rx_resources(adapter);
652
653 return 0;
654 }
655
656 /**
657 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658 * @adapter: board private structure
659 *
660 * Return 0 on success, negative on failure
661 **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667 struct pci_dev *pdev = adapter->pdev;
668 int size;
669
670 size = sizeof(struct ixgb_buffer) * txdr->count;
671 txdr->buffer_info = vzalloc(size);
672 if (!txdr->buffer_info) {
673 netif_err(adapter, probe, adapter->netdev,
674 "Unable to allocate transmit descriptor ring memory\n");
675 return -ENOMEM;
676 }
677
678 /* round up to nearest 4K */
679
680 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
681 txdr->size = ALIGN(txdr->size, 4096);
682
683 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
684 GFP_KERNEL);
685 if (!txdr->desc) {
686 vfree(txdr->buffer_info);
687 netif_err(adapter, probe, adapter->netdev,
688 "Unable to allocate transmit descriptor memory\n");
689 return -ENOMEM;
690 }
691 memset(txdr->desc, 0, txdr->size);
692
693 txdr->next_to_use = 0;
694 txdr->next_to_clean = 0;
695
696 return 0;
697 }
698
699 /**
700 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
701 * @adapter: board private structure
702 *
703 * Configure the Tx unit of the MAC after a reset.
704 **/
705
706 static void
707 ixgb_configure_tx(struct ixgb_adapter *adapter)
708 {
709 u64 tdba = adapter->tx_ring.dma;
710 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
711 u32 tctl;
712 struct ixgb_hw *hw = &adapter->hw;
713
714 /* Setup the Base and Length of the Tx Descriptor Ring
715 * tx_ring.dma can be either a 32 or 64 bit value
716 */
717
718 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
719 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
720
721 IXGB_WRITE_REG(hw, TDLEN, tdlen);
722
723 /* Setup the HW Tx Head and Tail descriptor pointers */
724
725 IXGB_WRITE_REG(hw, TDH, 0);
726 IXGB_WRITE_REG(hw, TDT, 0);
727
728 /* don't set up txdctl, it induces performance problems if configured
729 * incorrectly */
730 /* Set the Tx Interrupt Delay register */
731
732 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
733
734 /* Program the Transmit Control Register */
735
736 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
737 IXGB_WRITE_REG(hw, TCTL, tctl);
738
739 /* Setup Transmit Descriptor Settings for this adapter */
740 adapter->tx_cmd_type =
741 IXGB_TX_DESC_TYPE |
742 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
743 }
744
745 /**
746 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
747 * @adapter: board private structure
748 *
749 * Returns 0 on success, negative on failure
750 **/
751
752 int
753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
754 {
755 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
756 struct pci_dev *pdev = adapter->pdev;
757 int size;
758
759 size = sizeof(struct ixgb_buffer) * rxdr->count;
760 rxdr->buffer_info = vzalloc(size);
761 if (!rxdr->buffer_info) {
762 netif_err(adapter, probe, adapter->netdev,
763 "Unable to allocate receive descriptor ring\n");
764 return -ENOMEM;
765 }
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 /* disable VLAN filtering */
1079 rctl &= ~IXGB_RCTL_CFIEN;
1080 rctl &= ~IXGB_RCTL_VFE;
1081 } else {
1082 if (netdev->flags & IFF_ALLMULTI) {
1083 rctl |= IXGB_RCTL_MPE;
1084 rctl &= ~IXGB_RCTL_UPE;
1085 } else {
1086 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1087 }
1088 /* enable VLAN filtering */
1089 rctl |= IXGB_RCTL_VFE;
1090 rctl &= ~IXGB_RCTL_CFIEN;
1091 }
1092
1093 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1094 rctl |= IXGB_RCTL_MPE;
1095 IXGB_WRITE_REG(hw, RCTL, rctl);
1096 } else {
1097 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1098 IXGB_ETH_LENGTH_OF_ADDRESS];
1099
1100 IXGB_WRITE_REG(hw, RCTL, rctl);
1101
1102 i = 0;
1103 netdev_for_each_mc_addr(ha, netdev)
1104 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1105 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1106
1107 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1108 }
1109
1110 if (netdev->features & NETIF_F_HW_VLAN_RX)
1111 ixgb_vlan_strip_enable(adapter);
1112 else
1113 ixgb_vlan_strip_disable(adapter);
1114
1115 }
1116
1117 /**
1118 * ixgb_watchdog - Timer Call-back
1119 * @data: pointer to netdev cast into an unsigned long
1120 **/
1121
1122 static void
1123 ixgb_watchdog(unsigned long data)
1124 {
1125 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1126 struct net_device *netdev = adapter->netdev;
1127 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1128
1129 ixgb_check_for_link(&adapter->hw);
1130
1131 if (ixgb_check_for_bad_link(&adapter->hw)) {
1132 /* force the reset path */
1133 netif_stop_queue(netdev);
1134 }
1135
1136 if (adapter->hw.link_up) {
1137 if (!netif_carrier_ok(netdev)) {
1138 netdev_info(netdev,
1139 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1140 (adapter->hw.fc.type == ixgb_fc_full) ?
1141 "RX/TX" :
1142 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1143 "RX" :
1144 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1145 "TX" : "None");
1146 adapter->link_speed = 10000;
1147 adapter->link_duplex = FULL_DUPLEX;
1148 netif_carrier_on(netdev);
1149 }
1150 } else {
1151 if (netif_carrier_ok(netdev)) {
1152 adapter->link_speed = 0;
1153 adapter->link_duplex = 0;
1154 netdev_info(netdev, "NIC Link is Down\n");
1155 netif_carrier_off(netdev);
1156 }
1157 }
1158
1159 ixgb_update_stats(adapter);
1160
1161 if (!netif_carrier_ok(netdev)) {
1162 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1163 /* We've lost link, so the controller stops DMA,
1164 * but we've got queued Tx work that's never going
1165 * to get done, so reset controller to flush Tx.
1166 * (Do the reset outside of interrupt context). */
1167 schedule_work(&adapter->tx_timeout_task);
1168 /* return immediately since reset is imminent */
1169 return;
1170 }
1171 }
1172
1173 /* Force detection of hung controller every watchdog period */
1174 adapter->detect_tx_hung = true;
1175
1176 /* generate an interrupt to force clean up of any stragglers */
1177 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1178
1179 /* Reset the timer */
1180 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1181 }
1182
1183 #define IXGB_TX_FLAGS_CSUM 0x00000001
1184 #define IXGB_TX_FLAGS_VLAN 0x00000002
1185 #define IXGB_TX_FLAGS_TSO 0x00000004
1186
1187 static int
1188 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1189 {
1190 struct ixgb_context_desc *context_desc;
1191 unsigned int i;
1192 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1193 u16 ipcse, tucse, mss;
1194 int err;
1195
1196 if (likely(skb_is_gso(skb))) {
1197 struct ixgb_buffer *buffer_info;
1198 struct iphdr *iph;
1199
1200 if (skb_header_cloned(skb)) {
1201 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1202 if (err)
1203 return err;
1204 }
1205
1206 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1207 mss = skb_shinfo(skb)->gso_size;
1208 iph = ip_hdr(skb);
1209 iph->tot_len = 0;
1210 iph->check = 0;
1211 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1212 iph->daddr, 0,
1213 IPPROTO_TCP, 0);
1214 ipcss = skb_network_offset(skb);
1215 ipcso = (void *)&(iph->check) - (void *)skb->data;
1216 ipcse = skb_transport_offset(skb) - 1;
1217 tucss = skb_transport_offset(skb);
1218 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1219 tucse = 0;
1220
1221 i = adapter->tx_ring.next_to_use;
1222 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1223 buffer_info = &adapter->tx_ring.buffer_info[i];
1224 WARN_ON(buffer_info->dma != 0);
1225
1226 context_desc->ipcss = ipcss;
1227 context_desc->ipcso = ipcso;
1228 context_desc->ipcse = cpu_to_le16(ipcse);
1229 context_desc->tucss = tucss;
1230 context_desc->tucso = tucso;
1231 context_desc->tucse = cpu_to_le16(tucse);
1232 context_desc->mss = cpu_to_le16(mss);
1233 context_desc->hdr_len = hdr_len;
1234 context_desc->status = 0;
1235 context_desc->cmd_type_len = cpu_to_le32(
1236 IXGB_CONTEXT_DESC_TYPE
1237 | IXGB_CONTEXT_DESC_CMD_TSE
1238 | IXGB_CONTEXT_DESC_CMD_IP
1239 | IXGB_CONTEXT_DESC_CMD_TCP
1240 | IXGB_CONTEXT_DESC_CMD_IDE
1241 | (skb->len - (hdr_len)));
1242
1243
1244 if (++i == adapter->tx_ring.count) i = 0;
1245 adapter->tx_ring.next_to_use = i;
1246
1247 return 1;
1248 }
1249
1250 return 0;
1251 }
1252
1253 static bool
1254 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1255 {
1256 struct ixgb_context_desc *context_desc;
1257 unsigned int i;
1258 u8 css, cso;
1259
1260 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1261 struct ixgb_buffer *buffer_info;
1262 css = skb_checksum_start_offset(skb);
1263 cso = css + skb->csum_offset;
1264
1265 i = adapter->tx_ring.next_to_use;
1266 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1267 buffer_info = &adapter->tx_ring.buffer_info[i];
1268 WARN_ON(buffer_info->dma != 0);
1269
1270 context_desc->tucss = css;
1271 context_desc->tucso = cso;
1272 context_desc->tucse = 0;
1273 /* zero out any previously existing data in one instruction */
1274 *(u32 *)&(context_desc->ipcss) = 0;
1275 context_desc->status = 0;
1276 context_desc->hdr_len = 0;
1277 context_desc->mss = 0;
1278 context_desc->cmd_type_len =
1279 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1280 | IXGB_TX_DESC_CMD_IDE);
1281
1282 if (++i == adapter->tx_ring.count) i = 0;
1283 adapter->tx_ring.next_to_use = i;
1284
1285 return true;
1286 }
1287
1288 return false;
1289 }
1290
1291 #define IXGB_MAX_TXD_PWR 14
1292 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1293
1294 static int
1295 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1296 unsigned int first)
1297 {
1298 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1299 struct pci_dev *pdev = adapter->pdev;
1300 struct ixgb_buffer *buffer_info;
1301 int len = skb_headlen(skb);
1302 unsigned int offset = 0, size, count = 0, i;
1303 unsigned int mss = skb_shinfo(skb)->gso_size;
1304 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1305 unsigned int f;
1306
1307 i = tx_ring->next_to_use;
1308
1309 while (len) {
1310 buffer_info = &tx_ring->buffer_info[i];
1311 size = min(len, IXGB_MAX_DATA_PER_TXD);
1312 /* Workaround for premature desc write-backs
1313 * in TSO mode. Append 4-byte sentinel desc */
1314 if (unlikely(mss && !nr_frags && size == len && size > 8))
1315 size -= 4;
1316
1317 buffer_info->length = size;
1318 WARN_ON(buffer_info->dma != 0);
1319 buffer_info->time_stamp = jiffies;
1320 buffer_info->mapped_as_page = false;
1321 buffer_info->dma = dma_map_single(&pdev->dev,
1322 skb->data + offset,
1323 size, DMA_TO_DEVICE);
1324 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1325 goto dma_error;
1326 buffer_info->next_to_watch = 0;
1327
1328 len -= size;
1329 offset += size;
1330 count++;
1331 if (len) {
1332 i++;
1333 if (i == tx_ring->count)
1334 i = 0;
1335 }
1336 }
1337
1338 for (f = 0; f < nr_frags; f++) {
1339 struct skb_frag_struct *frag;
1340
1341 frag = &skb_shinfo(skb)->frags[f];
1342 len = frag->size;
1343 offset = frag->page_offset;
1344
1345 while (len) {
1346 i++;
1347 if (i == tx_ring->count)
1348 i = 0;
1349
1350 buffer_info = &tx_ring->buffer_info[i];
1351 size = min(len, IXGB_MAX_DATA_PER_TXD);
1352
1353 /* Workaround for premature desc write-backs
1354 * in TSO mode. Append 4-byte sentinel desc */
1355 if (unlikely(mss && (f == (nr_frags - 1))
1356 && size == len && size > 8))
1357 size -= 4;
1358
1359 buffer_info->length = size;
1360 buffer_info->time_stamp = jiffies;
1361 buffer_info->mapped_as_page = true;
1362 buffer_info->dma =
1363 dma_map_page(&pdev->dev, frag->page,
1364 offset, size, DMA_TO_DEVICE);
1365 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1366 goto dma_error;
1367 buffer_info->next_to_watch = 0;
1368
1369 len -= size;
1370 offset += size;
1371 count++;
1372 }
1373 }
1374 tx_ring->buffer_info[i].skb = skb;
1375 tx_ring->buffer_info[first].next_to_watch = i;
1376
1377 return count;
1378
1379 dma_error:
1380 dev_err(&pdev->dev, "TX DMA map failed\n");
1381 buffer_info->dma = 0;
1382 if (count)
1383 count--;
1384
1385 while (count--) {
1386 if (i==0)
1387 i += tx_ring->count;
1388 i--;
1389 buffer_info = &tx_ring->buffer_info[i];
1390 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1391 }
1392
1393 return 0;
1394 }
1395
1396 static void
1397 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1398 {
1399 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1400 struct ixgb_tx_desc *tx_desc = NULL;
1401 struct ixgb_buffer *buffer_info;
1402 u32 cmd_type_len = adapter->tx_cmd_type;
1403 u8 status = 0;
1404 u8 popts = 0;
1405 unsigned int i;
1406
1407 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1408 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1409 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1410 }
1411
1412 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1413 popts |= IXGB_TX_DESC_POPTS_TXSM;
1414
1415 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1416 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1417
1418 i = tx_ring->next_to_use;
1419
1420 while (count--) {
1421 buffer_info = &tx_ring->buffer_info[i];
1422 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1423 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1424 tx_desc->cmd_type_len =
1425 cpu_to_le32(cmd_type_len | buffer_info->length);
1426 tx_desc->status = status;
1427 tx_desc->popts = popts;
1428 tx_desc->vlan = cpu_to_le16(vlan_id);
1429
1430 if (++i == tx_ring->count) i = 0;
1431 }
1432
1433 tx_desc->cmd_type_len |=
1434 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1435
1436 /* Force memory writes to complete before letting h/w
1437 * know there are new descriptors to fetch. (Only
1438 * applicable for weak-ordered memory model archs,
1439 * such as IA-64). */
1440 wmb();
1441
1442 tx_ring->next_to_use = i;
1443 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1444 }
1445
1446 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1447 {
1448 struct ixgb_adapter *adapter = netdev_priv(netdev);
1449 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1450
1451 netif_stop_queue(netdev);
1452 /* Herbert's original patch had:
1453 * smp_mb__after_netif_stop_queue();
1454 * but since that doesn't exist yet, just open code it. */
1455 smp_mb();
1456
1457 /* We need to check again in a case another CPU has just
1458 * made room available. */
1459 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1460 return -EBUSY;
1461
1462 /* A reprieve! */
1463 netif_start_queue(netdev);
1464 ++adapter->restart_queue;
1465 return 0;
1466 }
1467
1468 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1469 struct ixgb_desc_ring *tx_ring, int size)
1470 {
1471 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1472 return 0;
1473 return __ixgb_maybe_stop_tx(netdev, size);
1474 }
1475
1476
1477 /* Tx Descriptors needed, worst case */
1478 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1479 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1480 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1481 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1482 + 1 /* one more needed for sentinel TSO workaround */
1483
1484 static netdev_tx_t
1485 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1486 {
1487 struct ixgb_adapter *adapter = netdev_priv(netdev);
1488 unsigned int first;
1489 unsigned int tx_flags = 0;
1490 int vlan_id = 0;
1491 int count = 0;
1492 int tso;
1493
1494 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1495 dev_kfree_skb(skb);
1496 return NETDEV_TX_OK;
1497 }
1498
1499 if (skb->len <= 0) {
1500 dev_kfree_skb(skb);
1501 return NETDEV_TX_OK;
1502 }
1503
1504 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1505 DESC_NEEDED)))
1506 return NETDEV_TX_BUSY;
1507
1508 if (vlan_tx_tag_present(skb)) {
1509 tx_flags |= IXGB_TX_FLAGS_VLAN;
1510 vlan_id = vlan_tx_tag_get(skb);
1511 }
1512
1513 first = adapter->tx_ring.next_to_use;
1514
1515 tso = ixgb_tso(adapter, skb);
1516 if (tso < 0) {
1517 dev_kfree_skb(skb);
1518 return NETDEV_TX_OK;
1519 }
1520
1521 if (likely(tso))
1522 tx_flags |= IXGB_TX_FLAGS_TSO;
1523 else if (ixgb_tx_csum(adapter, skb))
1524 tx_flags |= IXGB_TX_FLAGS_CSUM;
1525
1526 count = ixgb_tx_map(adapter, skb, first);
1527
1528 if (count) {
1529 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1530 /* Make sure there is space in the ring for the next send. */
1531 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1532
1533 } else {
1534 dev_kfree_skb_any(skb);
1535 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1536 adapter->tx_ring.next_to_use = first;
1537 }
1538
1539 return NETDEV_TX_OK;
1540 }
1541
1542 /**
1543 * ixgb_tx_timeout - Respond to a Tx Hang
1544 * @netdev: network interface device structure
1545 **/
1546
1547 static void
1548 ixgb_tx_timeout(struct net_device *netdev)
1549 {
1550 struct ixgb_adapter *adapter = netdev_priv(netdev);
1551
1552 /* Do the reset outside of interrupt context */
1553 schedule_work(&adapter->tx_timeout_task);
1554 }
1555
1556 static void
1557 ixgb_tx_timeout_task(struct work_struct *work)
1558 {
1559 struct ixgb_adapter *adapter =
1560 container_of(work, struct ixgb_adapter, tx_timeout_task);
1561
1562 adapter->tx_timeout_count++;
1563 ixgb_down(adapter, true);
1564 ixgb_up(adapter);
1565 }
1566
1567 /**
1568 * ixgb_get_stats - Get System Network Statistics
1569 * @netdev: network interface device structure
1570 *
1571 * Returns the address of the device statistics structure.
1572 * The statistics are actually updated from the timer callback.
1573 **/
1574
1575 static struct net_device_stats *
1576 ixgb_get_stats(struct net_device *netdev)
1577 {
1578 return &netdev->stats;
1579 }
1580
1581 /**
1582 * ixgb_change_mtu - Change the Maximum Transfer Unit
1583 * @netdev: network interface device structure
1584 * @new_mtu: new value for maximum frame size
1585 *
1586 * Returns 0 on success, negative on failure
1587 **/
1588
1589 static int
1590 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1591 {
1592 struct ixgb_adapter *adapter = netdev_priv(netdev);
1593 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1594 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1595
1596 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1597 if ((new_mtu < 68) ||
1598 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1599 netif_err(adapter, probe, adapter->netdev,
1600 "Invalid MTU setting %d\n", new_mtu);
1601 return -EINVAL;
1602 }
1603
1604 if (old_max_frame == max_frame)
1605 return 0;
1606
1607 if (netif_running(netdev))
1608 ixgb_down(adapter, true);
1609
1610 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1611
1612 netdev->mtu = new_mtu;
1613
1614 if (netif_running(netdev))
1615 ixgb_up(adapter);
1616
1617 return 0;
1618 }
1619
1620 /**
1621 * ixgb_update_stats - Update the board statistics counters.
1622 * @adapter: board private structure
1623 **/
1624
1625 void
1626 ixgb_update_stats(struct ixgb_adapter *adapter)
1627 {
1628 struct net_device *netdev = adapter->netdev;
1629 struct pci_dev *pdev = adapter->pdev;
1630
1631 /* Prevent stats update while adapter is being reset */
1632 if (pci_channel_offline(pdev))
1633 return;
1634
1635 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1636 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1637 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1638 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1639 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1640 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1641
1642 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1643 /* fix up multicast stats by removing broadcasts */
1644 if (multi >= bcast)
1645 multi -= bcast;
1646
1647 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1648 adapter->stats.mprch += (multi >> 32);
1649 adapter->stats.bprcl += bcast_l;
1650 adapter->stats.bprch += bcast_h;
1651 } else {
1652 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1653 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1654 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1655 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1656 }
1657 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1658 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1659 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1660 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1661 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1662 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1663 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1664 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1665 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1666 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1667 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1668 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1669 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1670 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1671 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1672 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1673 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1674 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1675 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1676 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1677 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1678 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1679 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1680 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1681 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1682 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1683 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1684 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1685 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1686 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1687 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1688 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1689 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1690 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1691 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1692 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1693 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1694 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1695 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1696 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1697 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1698 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1699 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1700 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1701 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1702 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1703 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1704 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1705 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1706 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1707 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1708 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1709 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1710 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1711 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1712 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1713
1714 /* Fill out the OS statistics structure */
1715
1716 netdev->stats.rx_packets = adapter->stats.gprcl;
1717 netdev->stats.tx_packets = adapter->stats.gptcl;
1718 netdev->stats.rx_bytes = adapter->stats.gorcl;
1719 netdev->stats.tx_bytes = adapter->stats.gotcl;
1720 netdev->stats.multicast = adapter->stats.mprcl;
1721 netdev->stats.collisions = 0;
1722
1723 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1724 * with a length in the type/len field */
1725 netdev->stats.rx_errors =
1726 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1727 adapter->stats.ruc +
1728 adapter->stats.roc /*+ adapter->stats.rlec */ +
1729 adapter->stats.icbc +
1730 adapter->stats.ecbc + adapter->stats.mpc;
1731
1732 /* see above
1733 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1734 */
1735
1736 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1737 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1738 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1739 netdev->stats.rx_over_errors = adapter->stats.mpc;
1740
1741 netdev->stats.tx_errors = 0;
1742 netdev->stats.rx_frame_errors = 0;
1743 netdev->stats.tx_aborted_errors = 0;
1744 netdev->stats.tx_carrier_errors = 0;
1745 netdev->stats.tx_fifo_errors = 0;
1746 netdev->stats.tx_heartbeat_errors = 0;
1747 netdev->stats.tx_window_errors = 0;
1748 }
1749
1750 #define IXGB_MAX_INTR 10
1751 /**
1752 * ixgb_intr - Interrupt Handler
1753 * @irq: interrupt number
1754 * @data: pointer to a network interface device structure
1755 **/
1756
1757 static irqreturn_t
1758 ixgb_intr(int irq, void *data)
1759 {
1760 struct net_device *netdev = data;
1761 struct ixgb_adapter *adapter = netdev_priv(netdev);
1762 struct ixgb_hw *hw = &adapter->hw;
1763 u32 icr = IXGB_READ_REG(hw, ICR);
1764
1765 if (unlikely(!icr))
1766 return IRQ_NONE; /* Not our interrupt */
1767
1768 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1769 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1770 mod_timer(&adapter->watchdog_timer, jiffies);
1771
1772 if (napi_schedule_prep(&adapter->napi)) {
1773
1774 /* Disable interrupts and register for poll. The flush
1775 of the posted write is intentionally left out.
1776 */
1777
1778 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1779 __napi_schedule(&adapter->napi);
1780 }
1781 return IRQ_HANDLED;
1782 }
1783
1784 /**
1785 * ixgb_clean - NAPI Rx polling callback
1786 * @adapter: board private structure
1787 **/
1788
1789 static int
1790 ixgb_clean(struct napi_struct *napi, int budget)
1791 {
1792 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1793 int work_done = 0;
1794
1795 ixgb_clean_tx_irq(adapter);
1796 ixgb_clean_rx_irq(adapter, &work_done, budget);
1797
1798 /* If budget not fully consumed, exit the polling mode */
1799 if (work_done < budget) {
1800 napi_complete(napi);
1801 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1802 ixgb_irq_enable(adapter);
1803 }
1804
1805 return work_done;
1806 }
1807
1808 /**
1809 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1810 * @adapter: board private structure
1811 **/
1812
1813 static bool
1814 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1815 {
1816 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1817 struct net_device *netdev = adapter->netdev;
1818 struct ixgb_tx_desc *tx_desc, *eop_desc;
1819 struct ixgb_buffer *buffer_info;
1820 unsigned int i, eop;
1821 bool cleaned = false;
1822
1823 i = tx_ring->next_to_clean;
1824 eop = tx_ring->buffer_info[i].next_to_watch;
1825 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1826
1827 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1828
1829 rmb(); /* read buffer_info after eop_desc */
1830 for (cleaned = false; !cleaned; ) {
1831 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1832 buffer_info = &tx_ring->buffer_info[i];
1833
1834 if (tx_desc->popts &
1835 (IXGB_TX_DESC_POPTS_TXSM |
1836 IXGB_TX_DESC_POPTS_IXSM))
1837 adapter->hw_csum_tx_good++;
1838
1839 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1840
1841 *(u32 *)&(tx_desc->status) = 0;
1842
1843 cleaned = (i == eop);
1844 if (++i == tx_ring->count) i = 0;
1845 }
1846
1847 eop = tx_ring->buffer_info[i].next_to_watch;
1848 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1849 }
1850
1851 tx_ring->next_to_clean = i;
1852
1853 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1854 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1855 /* Make sure that anybody stopping the queue after this
1856 * sees the new next_to_clean. */
1857 smp_mb();
1858
1859 if (netif_queue_stopped(netdev) &&
1860 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1861 netif_wake_queue(netdev);
1862 ++adapter->restart_queue;
1863 }
1864 }
1865
1866 if (adapter->detect_tx_hung) {
1867 /* detect a transmit hang in hardware, this serializes the
1868 * check with the clearing of time_stamp and movement of i */
1869 adapter->detect_tx_hung = false;
1870 if (tx_ring->buffer_info[eop].time_stamp &&
1871 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1872 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1873 IXGB_STATUS_TXOFF)) {
1874 /* detected Tx unit hang */
1875 netif_err(adapter, drv, adapter->netdev,
1876 "Detected Tx Unit Hang\n"
1877 " TDH <%x>\n"
1878 " TDT <%x>\n"
1879 " next_to_use <%x>\n"
1880 " next_to_clean <%x>\n"
1881 "buffer_info[next_to_clean]\n"
1882 " time_stamp <%lx>\n"
1883 " next_to_watch <%x>\n"
1884 " jiffies <%lx>\n"
1885 " next_to_watch.status <%x>\n",
1886 IXGB_READ_REG(&adapter->hw, TDH),
1887 IXGB_READ_REG(&adapter->hw, TDT),
1888 tx_ring->next_to_use,
1889 tx_ring->next_to_clean,
1890 tx_ring->buffer_info[eop].time_stamp,
1891 eop,
1892 jiffies,
1893 eop_desc->status);
1894 netif_stop_queue(netdev);
1895 }
1896 }
1897
1898 return cleaned;
1899 }
1900
1901 /**
1902 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1903 * @adapter: board private structure
1904 * @rx_desc: receive descriptor
1905 * @sk_buff: socket buffer with received data
1906 **/
1907
1908 static void
1909 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1910 struct ixgb_rx_desc *rx_desc,
1911 struct sk_buff *skb)
1912 {
1913 /* Ignore Checksum bit is set OR
1914 * TCP Checksum has not been calculated
1915 */
1916 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1917 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1918 skb_checksum_none_assert(skb);
1919 return;
1920 }
1921
1922 /* At this point we know the hardware did the TCP checksum */
1923 /* now look at the TCP checksum error bit */
1924 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1925 /* let the stack verify checksum errors */
1926 skb_checksum_none_assert(skb);
1927 adapter->hw_csum_rx_error++;
1928 } else {
1929 /* TCP checksum is good */
1930 skb->ip_summed = CHECKSUM_UNNECESSARY;
1931 adapter->hw_csum_rx_good++;
1932 }
1933 }
1934
1935 /*
1936 * this should improve performance for small packets with large amounts
1937 * of reassembly being done in the stack
1938 */
1939 static void ixgb_check_copybreak(struct net_device *netdev,
1940 struct ixgb_buffer *buffer_info,
1941 u32 length, struct sk_buff **skb)
1942 {
1943 struct sk_buff *new_skb;
1944
1945 if (length > copybreak)
1946 return;
1947
1948 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1949 if (!new_skb)
1950 return;
1951
1952 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1953 (*skb)->data - NET_IP_ALIGN,
1954 length + NET_IP_ALIGN);
1955 /* save the skb in buffer_info as good */
1956 buffer_info->skb = *skb;
1957 *skb = new_skb;
1958 }
1959
1960 /**
1961 * ixgb_clean_rx_irq - Send received data up the network stack,
1962 * @adapter: board private structure
1963 **/
1964
1965 static bool
1966 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1967 {
1968 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1969 struct net_device *netdev = adapter->netdev;
1970 struct pci_dev *pdev = adapter->pdev;
1971 struct ixgb_rx_desc *rx_desc, *next_rxd;
1972 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1973 u32 length;
1974 unsigned int i, j;
1975 int cleaned_count = 0;
1976 bool cleaned = false;
1977
1978 i = rx_ring->next_to_clean;
1979 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1980 buffer_info = &rx_ring->buffer_info[i];
1981
1982 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1983 struct sk_buff *skb;
1984 u8 status;
1985
1986 if (*work_done >= work_to_do)
1987 break;
1988
1989 (*work_done)++;
1990 rmb(); /* read descriptor and rx_buffer_info after status DD */
1991 status = rx_desc->status;
1992 skb = buffer_info->skb;
1993 buffer_info->skb = NULL;
1994
1995 prefetch(skb->data - NET_IP_ALIGN);
1996
1997 if (++i == rx_ring->count)
1998 i = 0;
1999 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2000 prefetch(next_rxd);
2001
2002 j = i + 1;
2003 if (j == rx_ring->count)
2004 j = 0;
2005 next2_buffer = &rx_ring->buffer_info[j];
2006 prefetch(next2_buffer);
2007
2008 next_buffer = &rx_ring->buffer_info[i];
2009
2010 cleaned = true;
2011 cleaned_count++;
2012
2013 dma_unmap_single(&pdev->dev,
2014 buffer_info->dma,
2015 buffer_info->length,
2016 DMA_FROM_DEVICE);
2017 buffer_info->dma = 0;
2018
2019 length = le16_to_cpu(rx_desc->length);
2020 rx_desc->length = 0;
2021
2022 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2023
2024 /* All receives must fit into a single buffer */
2025
2026 IXGB_DBG("Receive packet consumed multiple buffers "
2027 "length<%x>\n", length);
2028
2029 dev_kfree_skb_irq(skb);
2030 goto rxdesc_done;
2031 }
2032
2033 if (unlikely(rx_desc->errors &
2034 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2035 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2036 dev_kfree_skb_irq(skb);
2037 goto rxdesc_done;
2038 }
2039
2040 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2041
2042 /* Good Receive */
2043 skb_put(skb, length);
2044
2045 /* Receive Checksum Offload */
2046 ixgb_rx_checksum(adapter, rx_desc, skb);
2047
2048 skb->protocol = eth_type_trans(skb, netdev);
2049 if (status & IXGB_RX_DESC_STATUS_VP)
2050 __vlan_hwaccel_put_tag(skb,
2051 le16_to_cpu(rx_desc->special));
2052
2053 netif_receive_skb(skb);
2054
2055 rxdesc_done:
2056 /* clean up descriptor, might be written over by hw */
2057 rx_desc->status = 0;
2058
2059 /* return some buffers to hardware, one at a time is too slow */
2060 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2061 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2062 cleaned_count = 0;
2063 }
2064
2065 /* use prefetched values */
2066 rx_desc = next_rxd;
2067 buffer_info = next_buffer;
2068 }
2069
2070 rx_ring->next_to_clean = i;
2071
2072 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2073 if (cleaned_count)
2074 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2075
2076 return cleaned;
2077 }
2078
2079 /**
2080 * ixgb_alloc_rx_buffers - Replace used receive buffers
2081 * @adapter: address of board private structure
2082 **/
2083
2084 static void
2085 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2086 {
2087 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2088 struct net_device *netdev = adapter->netdev;
2089 struct pci_dev *pdev = adapter->pdev;
2090 struct ixgb_rx_desc *rx_desc;
2091 struct ixgb_buffer *buffer_info;
2092 struct sk_buff *skb;
2093 unsigned int i;
2094 long cleancount;
2095
2096 i = rx_ring->next_to_use;
2097 buffer_info = &rx_ring->buffer_info[i];
2098 cleancount = IXGB_DESC_UNUSED(rx_ring);
2099
2100
2101 /* leave three descriptors unused */
2102 while (--cleancount > 2 && cleaned_count--) {
2103 /* recycle! its good for you */
2104 skb = buffer_info->skb;
2105 if (skb) {
2106 skb_trim(skb, 0);
2107 goto map_skb;
2108 }
2109
2110 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2111 if (unlikely(!skb)) {
2112 /* Better luck next round */
2113 adapter->alloc_rx_buff_failed++;
2114 break;
2115 }
2116
2117 buffer_info->skb = skb;
2118 buffer_info->length = adapter->rx_buffer_len;
2119 map_skb:
2120 buffer_info->dma = dma_map_single(&pdev->dev,
2121 skb->data,
2122 adapter->rx_buffer_len,
2123 DMA_FROM_DEVICE);
2124
2125 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2126 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2127 /* guarantee DD bit not set now before h/w gets descriptor
2128 * this is the rest of the workaround for h/w double
2129 * writeback. */
2130 rx_desc->status = 0;
2131
2132
2133 if (++i == rx_ring->count) i = 0;
2134 buffer_info = &rx_ring->buffer_info[i];
2135 }
2136
2137 if (likely(rx_ring->next_to_use != i)) {
2138 rx_ring->next_to_use = i;
2139 if (unlikely(i-- == 0))
2140 i = (rx_ring->count - 1);
2141
2142 /* Force memory writes to complete before letting h/w
2143 * know there are new descriptors to fetch. (Only
2144 * applicable for weak-ordered memory model archs, such
2145 * as IA-64). */
2146 wmb();
2147 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2148 }
2149 }
2150
2151 static void
2152 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2153 {
2154 u32 ctrl;
2155
2156 /* enable VLAN tag insert/strip */
2157 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158 ctrl |= IXGB_CTRL0_VME;
2159 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160 }
2161
2162 static void
2163 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2164 {
2165 u32 ctrl;
2166
2167 /* disable VLAN tag insert/strip */
2168 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2169 ctrl &= ~IXGB_CTRL0_VME;
2170 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2171 }
2172
2173 static void
2174 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2175 {
2176 struct ixgb_adapter *adapter = netdev_priv(netdev);
2177 u32 vfta, index;
2178
2179 /* add VID to filter table */
2180
2181 index = (vid >> 5) & 0x7F;
2182 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2183 vfta |= (1 << (vid & 0x1F));
2184 ixgb_write_vfta(&adapter->hw, index, vfta);
2185 set_bit(vid, adapter->active_vlans);
2186 }
2187
2188 static void
2189 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2190 {
2191 struct ixgb_adapter *adapter = netdev_priv(netdev);
2192 u32 vfta, index;
2193
2194 /* remove VID from filter table */
2195
2196 index = (vid >> 5) & 0x7F;
2197 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2198 vfta &= ~(1 << (vid & 0x1F));
2199 ixgb_write_vfta(&adapter->hw, index, vfta);
2200 clear_bit(vid, adapter->active_vlans);
2201 }
2202
2203 static void
2204 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2205 {
2206 u16 vid;
2207
2208 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2209 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2210 }
2211
2212 #ifdef CONFIG_NET_POLL_CONTROLLER
2213 /*
2214 * Polling 'interrupt' - used by things like netconsole to send skbs
2215 * without having to re-enable interrupts. It's not called while
2216 * the interrupt routine is executing.
2217 */
2218
2219 static void ixgb_netpoll(struct net_device *dev)
2220 {
2221 struct ixgb_adapter *adapter = netdev_priv(dev);
2222
2223 disable_irq(adapter->pdev->irq);
2224 ixgb_intr(adapter->pdev->irq, dev);
2225 enable_irq(adapter->pdev->irq);
2226 }
2227 #endif
2228
2229 /**
2230 * ixgb_io_error_detected() - called when PCI error is detected
2231 * @pdev pointer to pci device with error
2232 * @state pci channel state after error
2233 *
2234 * This callback is called by the PCI subsystem whenever
2235 * a PCI bus error is detected.
2236 */
2237 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2238 enum pci_channel_state state)
2239 {
2240 struct net_device *netdev = pci_get_drvdata(pdev);
2241 struct ixgb_adapter *adapter = netdev_priv(netdev);
2242
2243 netif_device_detach(netdev);
2244
2245 if (state == pci_channel_io_perm_failure)
2246 return PCI_ERS_RESULT_DISCONNECT;
2247
2248 if (netif_running(netdev))
2249 ixgb_down(adapter, true);
2250
2251 pci_disable_device(pdev);
2252
2253 /* Request a slot reset. */
2254 return PCI_ERS_RESULT_NEED_RESET;
2255 }
2256
2257 /**
2258 * ixgb_io_slot_reset - called after the pci bus has been reset.
2259 * @pdev pointer to pci device with error
2260 *
2261 * This callback is called after the PCI bus has been reset.
2262 * Basically, this tries to restart the card from scratch.
2263 * This is a shortened version of the device probe/discovery code,
2264 * it resembles the first-half of the ixgb_probe() routine.
2265 */
2266 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2267 {
2268 struct net_device *netdev = pci_get_drvdata(pdev);
2269 struct ixgb_adapter *adapter = netdev_priv(netdev);
2270
2271 if (pci_enable_device(pdev)) {
2272 netif_err(adapter, probe, adapter->netdev,
2273 "Cannot re-enable PCI device after reset\n");
2274 return PCI_ERS_RESULT_DISCONNECT;
2275 }
2276
2277 /* Perform card reset only on one instance of the card */
2278 if (0 != PCI_FUNC (pdev->devfn))
2279 return PCI_ERS_RESULT_RECOVERED;
2280
2281 pci_set_master(pdev);
2282
2283 netif_carrier_off(netdev);
2284 netif_stop_queue(netdev);
2285 ixgb_reset(adapter);
2286
2287 /* Make sure the EEPROM is good */
2288 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2289 netif_err(adapter, probe, adapter->netdev,
2290 "After reset, the EEPROM checksum is not valid\n");
2291 return PCI_ERS_RESULT_DISCONNECT;
2292 }
2293 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2294 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2295
2296 if (!is_valid_ether_addr(netdev->perm_addr)) {
2297 netif_err(adapter, probe, adapter->netdev,
2298 "After reset, invalid MAC address\n");
2299 return PCI_ERS_RESULT_DISCONNECT;
2300 }
2301
2302 return PCI_ERS_RESULT_RECOVERED;
2303 }
2304
2305 /**
2306 * ixgb_io_resume - called when its OK to resume normal operations
2307 * @pdev pointer to pci device with error
2308 *
2309 * The error recovery driver tells us that its OK to resume
2310 * normal operation. Implementation resembles the second-half
2311 * of the ixgb_probe() routine.
2312 */
2313 static void ixgb_io_resume(struct pci_dev *pdev)
2314 {
2315 struct net_device *netdev = pci_get_drvdata(pdev);
2316 struct ixgb_adapter *adapter = netdev_priv(netdev);
2317
2318 pci_set_master(pdev);
2319
2320 if (netif_running(netdev)) {
2321 if (ixgb_up(adapter)) {
2322 pr_err("can't bring device back up after reset\n");
2323 return;
2324 }
2325 }
2326
2327 netif_device_attach(netdev);
2328 mod_timer(&adapter->watchdog_timer, jiffies);
2329 }
2330
2331 /* ixgb_main.c */
linux-next