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vlan: Rename VLAN_GROUP_ARRAY_LEN to VLAN_N_VID.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / ixgb / ixgb_main.c
blob666207a9c039ee2875aa92a553f5f9e321573df7
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2008 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include "ixgb.h"
32
33 char ixgb_driver_name[] = "ixgb";
34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
35
36 #define DRIVERNAPI "-NAPI"
37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
38 const char ixgb_driver_version[] = DRV_VERSION;
39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
40
41 #define IXGB_CB_LENGTH 256
42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
43 module_param(copybreak, uint, 0644);
44 MODULE_PARM_DESC(copybreak,
45 "Maximum size of packet that is copied to a new buffer on receive");
46
47 /* ixgb_pci_tbl - PCI Device ID Table
48 *
49 * Wildcard entries (PCI_ANY_ID) should come last
50 * Last entry must be all 0s
51 *
52 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
53 * Class, Class Mask, private data (not used) }
54 */
55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
63 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64
65 /* required last entry */
66 {0,}
67 };
68
69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
70
71 /* Local Function Prototypes */
72 static int ixgb_init_module(void);
73 static void ixgb_exit_module(void);
74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
75 static void __devexit ixgb_remove(struct pci_dev *pdev);
76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
77 static int ixgb_open(struct net_device *netdev);
78 static int ixgb_close(struct net_device *netdev);
79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_set_multi(struct net_device *netdev);
85 static void ixgb_watchdog(unsigned long data);
86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
87 struct net_device *netdev);
88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
90 static int ixgb_set_mac(struct net_device *netdev, void *p);
91 static irqreturn_t ixgb_intr(int irq, void *data);
92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
93
94 static int ixgb_clean(struct napi_struct *, int);
95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
97
98 static void ixgb_tx_timeout(struct net_device *dev);
99 static void ixgb_tx_timeout_task(struct work_struct *work);
100
101 static void ixgb_vlan_rx_register(struct net_device *netdev,
102 struct vlan_group *grp);
103 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
104 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
105 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
106
107 #ifdef CONFIG_NET_POLL_CONTROLLER
108 /* for netdump / net console */
109 static void ixgb_netpoll(struct net_device *dev);
110 #endif
111
112 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
113 enum pci_channel_state state);
114 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
115 static void ixgb_io_resume (struct pci_dev *pdev);
116
117 static struct pci_error_handlers ixgb_err_handler = {
118 .error_detected = ixgb_io_error_detected,
119 .slot_reset = ixgb_io_slot_reset,
120 .resume = ixgb_io_resume,
121 };
122
123 static struct pci_driver ixgb_driver = {
124 .name = ixgb_driver_name,
125 .id_table = ixgb_pci_tbl,
126 .probe = ixgb_probe,
127 .remove = __devexit_p(ixgb_remove),
128 .err_handler = &ixgb_err_handler
129 };
130
131 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
132 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
133 MODULE_LICENSE("GPL");
134 MODULE_VERSION(DRV_VERSION);
135
136 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
137 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
138 module_param(debug, int, 0);
139 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
140
141 /**
142 * ixgb_init_module - Driver Registration Routine
143 *
144 * ixgb_init_module is the first routine called when the driver is
145 * loaded. All it does is register with the PCI subsystem.
146 **/
147
148 static int __init
149 ixgb_init_module(void)
150 {
151 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
152 pr_info("%s\n", ixgb_copyright);
153
154 return pci_register_driver(&ixgb_driver);
155 }
156
157 module_init(ixgb_init_module);
158
159 /**
160 * ixgb_exit_module - Driver Exit Cleanup Routine
161 *
162 * ixgb_exit_module is called just before the driver is removed
163 * from memory.
164 **/
165
166 static void __exit
167 ixgb_exit_module(void)
168 {
169 pci_unregister_driver(&ixgb_driver);
170 }
171
172 module_exit(ixgb_exit_module);
173
174 /**
175 * ixgb_irq_disable - Mask off interrupt generation on the NIC
176 * @adapter: board private structure
177 **/
178
179 static void
180 ixgb_irq_disable(struct ixgb_adapter *adapter)
181 {
182 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
183 IXGB_WRITE_FLUSH(&adapter->hw);
184 synchronize_irq(adapter->pdev->irq);
185 }
186
187 /**
188 * ixgb_irq_enable - Enable default interrupt generation settings
189 * @adapter: board private structure
190 **/
191
192 static void
193 ixgb_irq_enable(struct ixgb_adapter *adapter)
194 {
195 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
196 IXGB_INT_TXDW | IXGB_INT_LSC;
197 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
198 val |= IXGB_INT_GPI0;
199 IXGB_WRITE_REG(&adapter->hw, IMS, val);
200 IXGB_WRITE_FLUSH(&adapter->hw);
201 }
202
203 int
204 ixgb_up(struct ixgb_adapter *adapter)
205 {
206 struct net_device *netdev = adapter->netdev;
207 int err, irq_flags = IRQF_SHARED;
208 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
209 struct ixgb_hw *hw = &adapter->hw;
210
211 /* hardware has been reset, we need to reload some things */
212
213 ixgb_rar_set(hw, netdev->dev_addr, 0);
214 ixgb_set_multi(netdev);
215
216 ixgb_restore_vlan(adapter);
217
218 ixgb_configure_tx(adapter);
219 ixgb_setup_rctl(adapter);
220 ixgb_configure_rx(adapter);
221 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
222
223 /* disable interrupts and get the hardware into a known state */
224 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
225
226 /* only enable MSI if bus is in PCI-X mode */
227 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
228 err = pci_enable_msi(adapter->pdev);
229 if (!err) {
230 adapter->have_msi = 1;
231 irq_flags = 0;
232 }
233 /* proceed to try to request regular interrupt */
234 }
235
236 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
237 netdev->name, netdev);
238 if (err) {
239 if (adapter->have_msi)
240 pci_disable_msi(adapter->pdev);
241 netif_err(adapter, probe, adapter->netdev,
242 "Unable to allocate interrupt Error: %d\n", err);
243 return err;
244 }
245
246 if ((hw->max_frame_size != max_frame) ||
247 (hw->max_frame_size !=
248 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
249
250 hw->max_frame_size = max_frame;
251
252 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
253
254 if (hw->max_frame_size >
255 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
256 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
257
258 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
259 ctrl0 |= IXGB_CTRL0_JFE;
260 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
261 }
262 }
263 }
264
265 clear_bit(__IXGB_DOWN, &adapter->flags);
266
267 napi_enable(&adapter->napi);
268 ixgb_irq_enable(adapter);
269
270 netif_wake_queue(netdev);
271
272 mod_timer(&adapter->watchdog_timer, jiffies);
273
274 return 0;
275 }
276
277 void
278 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
279 {
280 struct net_device *netdev = adapter->netdev;
281
282 /* prevent the interrupt handler from restarting watchdog */
283 set_bit(__IXGB_DOWN, &adapter->flags);
284
285 napi_disable(&adapter->napi);
286 /* waiting for NAPI to complete can re-enable interrupts */
287 ixgb_irq_disable(adapter);
288 free_irq(adapter->pdev->irq, netdev);
289
290 if (adapter->have_msi)
291 pci_disable_msi(adapter->pdev);
292
293 if (kill_watchdog)
294 del_timer_sync(&adapter->watchdog_timer);
295
296 adapter->link_speed = 0;
297 adapter->link_duplex = 0;
298 netif_carrier_off(netdev);
299 netif_stop_queue(netdev);
300
301 ixgb_reset(adapter);
302 ixgb_clean_tx_ring(adapter);
303 ixgb_clean_rx_ring(adapter);
304 }
305
306 void
307 ixgb_reset(struct ixgb_adapter *adapter)
308 {
309 struct ixgb_hw *hw = &adapter->hw;
310
311 ixgb_adapter_stop(hw);
312 if (!ixgb_init_hw(hw))
313 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
314
315 /* restore frame size information */
316 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
317 if (hw->max_frame_size >
318 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
319 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
320 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
321 ctrl0 |= IXGB_CTRL0_JFE;
322 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
323 }
324 }
325 }
326
327 static const struct net_device_ops ixgb_netdev_ops = {
328 .ndo_open = ixgb_open,
329 .ndo_stop = ixgb_close,
330 .ndo_start_xmit = ixgb_xmit_frame,
331 .ndo_get_stats = ixgb_get_stats,
332 .ndo_set_multicast_list = ixgb_set_multi,
333 .ndo_validate_addr = eth_validate_addr,
334 .ndo_set_mac_address = ixgb_set_mac,
335 .ndo_change_mtu = ixgb_change_mtu,
336 .ndo_tx_timeout = ixgb_tx_timeout,
337 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
338 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
339 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
340 #ifdef CONFIG_NET_POLL_CONTROLLER
341 .ndo_poll_controller = ixgb_netpoll,
342 #endif
343 };
344
345 /**
346 * ixgb_probe - Device Initialization Routine
347 * @pdev: PCI device information struct
348 * @ent: entry in ixgb_pci_tbl
349 *
350 * Returns 0 on success, negative on failure
351 *
352 * ixgb_probe initializes an adapter identified by a pci_dev structure.
353 * The OS initialization, configuring of the adapter private structure,
354 * and a hardware reset occur.
355 **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
359 {
360 struct net_device *netdev = NULL;
361 struct ixgb_adapter *adapter;
362 static int cards_found = 0;
363 int pci_using_dac;
364 int i;
365 int err;
366
367 err = pci_enable_device(pdev);
368 if (err)
369 return err;
370
371 pci_using_dac = 0;
372 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
373 if (!err) {
374 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
375 if (!err)
376 pci_using_dac = 1;
377 } else {
378 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
379 if (err) {
380 err = dma_set_coherent_mask(&pdev->dev,
381 DMA_BIT_MASK(32));
382 if (err) {
383 pr_err("No usable DMA configuration, aborting\n");
384 goto err_dma_mask;
385 }
386 }
387 }
388
389 err = pci_request_regions(pdev, ixgb_driver_name);
390 if (err)
391 goto err_request_regions;
392
393 pci_set_master(pdev);
394
395 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
396 if (!netdev) {
397 err = -ENOMEM;
398 goto err_alloc_etherdev;
399 }
400
401 SET_NETDEV_DEV(netdev, &pdev->dev);
402
403 pci_set_drvdata(pdev, netdev);
404 adapter = netdev_priv(netdev);
405 adapter->netdev = netdev;
406 adapter->pdev = pdev;
407 adapter->hw.back = adapter;
408 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
409
410 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
411 if (!adapter->hw.hw_addr) {
412 err = -EIO;
413 goto err_ioremap;
414 }
415
416 for (i = BAR_1; i <= BAR_5; i++) {
417 if (pci_resource_len(pdev, i) == 0)
418 continue;
419 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
420 adapter->hw.io_base = pci_resource_start(pdev, i);
421 break;
422 }
423 }
424
425 netdev->netdev_ops = &ixgb_netdev_ops;
426 ixgb_set_ethtool_ops(netdev);
427 netdev->watchdog_timeo = 5 * HZ;
428 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
429
430 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
431
432 adapter->bd_number = cards_found;
433 adapter->link_speed = 0;
434 adapter->link_duplex = 0;
435
436 /* setup the private structure */
437
438 err = ixgb_sw_init(adapter);
439 if (err)
440 goto err_sw_init;
441
442 netdev->features = NETIF_F_SG |
443 NETIF_F_HW_CSUM |
444 NETIF_F_HW_VLAN_TX |
445 NETIF_F_HW_VLAN_RX |
446 NETIF_F_HW_VLAN_FILTER;
447 netdev->features |= NETIF_F_TSO;
448
449 if (pci_using_dac) {
450 netdev->features |= NETIF_F_HIGHDMA;
451 netdev->vlan_features |= NETIF_F_HIGHDMA;
452 }
453
454 /* make sure the EEPROM is good */
455
456 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
457 netif_err(adapter, probe, adapter->netdev,
458 "The EEPROM Checksum Is Not Valid\n");
459 err = -EIO;
460 goto err_eeprom;
461 }
462
463 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
464 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
465
466 if (!is_valid_ether_addr(netdev->perm_addr)) {
467 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
468 err = -EIO;
469 goto err_eeprom;
470 }
471
472 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
473
474 init_timer(&adapter->watchdog_timer);
475 adapter->watchdog_timer.function = ixgb_watchdog;
476 adapter->watchdog_timer.data = (unsigned long)adapter;
477
478 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
479
480 strcpy(netdev->name, "eth%d");
481 err = register_netdev(netdev);
482 if (err)
483 goto err_register;
484
485 /* carrier off reporting is important to ethtool even BEFORE open */
486 netif_carrier_off(netdev);
487
488 netif_info(adapter, probe, adapter->netdev,
489 "Intel(R) PRO/10GbE Network Connection\n");
490 ixgb_check_options(adapter);
491 /* reset the hardware with the new settings */
492
493 ixgb_reset(adapter);
494
495 cards_found++;
496 return 0;
497
498 err_register:
499 err_sw_init:
500 err_eeprom:
501 iounmap(adapter->hw.hw_addr);
502 err_ioremap:
503 free_netdev(netdev);
504 err_alloc_etherdev:
505 pci_release_regions(pdev);
506 err_request_regions:
507 err_dma_mask:
508 pci_disable_device(pdev);
509 return err;
510 }
511
512 /**
513 * ixgb_remove - Device Removal Routine
514 * @pdev: PCI device information struct
515 *
516 * ixgb_remove is called by the PCI subsystem to alert the driver
517 * that it should release a PCI device. The could be caused by a
518 * Hot-Plug event, or because the driver is going to be removed from
519 * memory.
520 **/
521
522 static void __devexit
523 ixgb_remove(struct pci_dev *pdev)
524 {
525 struct net_device *netdev = pci_get_drvdata(pdev);
526 struct ixgb_adapter *adapter = netdev_priv(netdev);
527
528 flush_scheduled_work();
529
530 unregister_netdev(netdev);
531
532 iounmap(adapter->hw.hw_addr);
533 pci_release_regions(pdev);
534
535 free_netdev(netdev);
536 }
537
538 /**
539 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
540 * @adapter: board private structure to initialize
541 *
542 * ixgb_sw_init initializes the Adapter private data structure.
543 * Fields are initialized based on PCI device information and
544 * OS network device settings (MTU size).
545 **/
546
547 static int __devinit
548 ixgb_sw_init(struct ixgb_adapter *adapter)
549 {
550 struct ixgb_hw *hw = &adapter->hw;
551 struct net_device *netdev = adapter->netdev;
552 struct pci_dev *pdev = adapter->pdev;
553
554 /* PCI config space info */
555
556 hw->vendor_id = pdev->vendor;
557 hw->device_id = pdev->device;
558 hw->subsystem_vendor_id = pdev->subsystem_vendor;
559 hw->subsystem_id = pdev->subsystem_device;
560
561 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
562 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
563
564 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
565 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
566 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
567 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
568 hw->mac_type = ixgb_82597;
569 else {
570 /* should never have loaded on this device */
571 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
572 }
573
574 /* enable flow control to be programmed */
575 hw->fc.send_xon = 1;
576
577 set_bit(__IXGB_DOWN, &adapter->flags);
578 return 0;
579 }
580
581 /**
582 * ixgb_open - Called when a network interface is made active
583 * @netdev: network interface device structure
584 *
585 * Returns 0 on success, negative value on failure
586 *
587 * The open entry point is called when a network interface is made
588 * active by the system (IFF_UP). At this point all resources needed
589 * for transmit and receive operations are allocated, the interrupt
590 * handler is registered with the OS, the watchdog timer is started,
591 * and the stack is notified that the interface is ready.
592 **/
593
594 static int
595 ixgb_open(struct net_device *netdev)
596 {
597 struct ixgb_adapter *adapter = netdev_priv(netdev);
598 int err;
599
600 /* allocate transmit descriptors */
601 err = ixgb_setup_tx_resources(adapter);
602 if (err)
603 goto err_setup_tx;
604
605 netif_carrier_off(netdev);
606
607 /* allocate receive descriptors */
608
609 err = ixgb_setup_rx_resources(adapter);
610 if (err)
611 goto err_setup_rx;
612
613 err = ixgb_up(adapter);
614 if (err)
615 goto err_up;
616
617 netif_start_queue(netdev);
618
619 return 0;
620
621 err_up:
622 ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624 ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626 ixgb_reset(adapter);
627
628 return err;
629 }
630
631 /**
632 * ixgb_close - Disables a network interface
633 * @netdev: network interface device structure
634 *
635 * Returns 0, this is not allowed to fail
636 *
637 * The close entry point is called when an interface is de-activated
638 * by the OS. The hardware is still under the drivers control, but
639 * needs to be disabled. A global MAC reset is issued to stop the
640 * hardware, and all transmit and receive resources are freed.
641 **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646 struct ixgb_adapter *adapter = netdev_priv(netdev);
647
648 ixgb_down(adapter, true);
649
650 ixgb_free_tx_resources(adapter);
651 ixgb_free_rx_resources(adapter);
652
653 return 0;
654 }
655
656 /**
657 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658 * @adapter: board private structure
659 *
660 * Return 0 on success, negative on failure
661 **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667 struct pci_dev *pdev = adapter->pdev;
668 int size;
669
670 size = sizeof(struct ixgb_buffer) * txdr->count;
671 txdr->buffer_info = vmalloc(size);
672 if (!txdr->buffer_info) {
673 netif_err(adapter, probe, adapter->netdev,
674 "Unable to allocate transmit descriptor ring memory\n");
675 return -ENOMEM;
676 }
677 memset(txdr->buffer_info, 0, size);
678
679 /* round up to nearest 4K */
680
681 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
682 txdr->size = ALIGN(txdr->size, 4096);
683
684 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
685 GFP_KERNEL);
686 if (!txdr->desc) {
687 vfree(txdr->buffer_info);
688 netif_err(adapter, probe, adapter->netdev,
689 "Unable to allocate transmit descriptor memory\n");
690 return -ENOMEM;
691 }
692 memset(txdr->desc, 0, txdr->size);
693
694 txdr->next_to_use = 0;
695 txdr->next_to_clean = 0;
696
697 return 0;
698 }
699
700 /**
701 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
702 * @adapter: board private structure
703 *
704 * Configure the Tx unit of the MAC after a reset.
705 **/
706
707 static void
708 ixgb_configure_tx(struct ixgb_adapter *adapter)
709 {
710 u64 tdba = adapter->tx_ring.dma;
711 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
712 u32 tctl;
713 struct ixgb_hw *hw = &adapter->hw;
714
715 /* Setup the Base and Length of the Tx Descriptor Ring
716 * tx_ring.dma can be either a 32 or 64 bit value
717 */
718
719 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
720 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
721
722 IXGB_WRITE_REG(hw, TDLEN, tdlen);
723
724 /* Setup the HW Tx Head and Tail descriptor pointers */
725
726 IXGB_WRITE_REG(hw, TDH, 0);
727 IXGB_WRITE_REG(hw, TDT, 0);
728
729 /* don't set up txdctl, it induces performance problems if configured
730 * incorrectly */
731 /* Set the Tx Interrupt Delay register */
732
733 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
734
735 /* Program the Transmit Control Register */
736
737 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
738 IXGB_WRITE_REG(hw, TCTL, tctl);
739
740 /* Setup Transmit Descriptor Settings for this adapter */
741 adapter->tx_cmd_type =
742 IXGB_TX_DESC_TYPE |
743 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
744 }
745
746 /**
747 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
748 * @adapter: board private structure
749 *
750 * Returns 0 on success, negative on failure
751 **/
752
753 int
754 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
755 {
756 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
757 struct pci_dev *pdev = adapter->pdev;
758 int size;
759
760 size = sizeof(struct ixgb_buffer) * rxdr->count;
761 rxdr->buffer_info = vmalloc(size);
762 if (!rxdr->buffer_info) {
763 netif_err(adapter, probe, adapter->netdev,
764 "Unable to allocate receive descriptor ring\n");
765 return -ENOMEM;
766 }
767 memset(rxdr->buffer_info, 0, size);
768
769 /* Round up to nearest 4K */
770
771 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
772 rxdr->size = ALIGN(rxdr->size, 4096);
773
774 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
775 GFP_KERNEL);
776
777 if (!rxdr->desc) {
778 vfree(rxdr->buffer_info);
779 netif_err(adapter, probe, adapter->netdev,
780 "Unable to allocate receive descriptors\n");
781 return -ENOMEM;
782 }
783 memset(rxdr->desc, 0, rxdr->size);
784
785 rxdr->next_to_clean = 0;
786 rxdr->next_to_use = 0;
787
788 return 0;
789 }
790
791 /**
792 * ixgb_setup_rctl - configure the receive control register
793 * @adapter: Board private structure
794 **/
795
796 static void
797 ixgb_setup_rctl(struct ixgb_adapter *adapter)
798 {
799 u32 rctl;
800
801 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
802
803 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
804
805 rctl |=
806 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
807 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
808 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
809
810 rctl |= IXGB_RCTL_SECRC;
811
812 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
813 rctl |= IXGB_RCTL_BSIZE_2048;
814 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
815 rctl |= IXGB_RCTL_BSIZE_4096;
816 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
817 rctl |= IXGB_RCTL_BSIZE_8192;
818 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
819 rctl |= IXGB_RCTL_BSIZE_16384;
820
821 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
822 }
823
824 /**
825 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
826 * @adapter: board private structure
827 *
828 * Configure the Rx unit of the MAC after a reset.
829 **/
830
831 static void
832 ixgb_configure_rx(struct ixgb_adapter *adapter)
833 {
834 u64 rdba = adapter->rx_ring.dma;
835 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
836 struct ixgb_hw *hw = &adapter->hw;
837 u32 rctl;
838 u32 rxcsum;
839
840 /* make sure receives are disabled while setting up the descriptors */
841
842 rctl = IXGB_READ_REG(hw, RCTL);
843 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
844
845 /* set the Receive Delay Timer Register */
846
847 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
848
849 /* Setup the Base and Length of the Rx Descriptor Ring */
850
851 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
852 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
853
854 IXGB_WRITE_REG(hw, RDLEN, rdlen);
855
856 /* Setup the HW Rx Head and Tail Descriptor Pointers */
857 IXGB_WRITE_REG(hw, RDH, 0);
858 IXGB_WRITE_REG(hw, RDT, 0);
859
860 /* due to the hardware errata with RXDCTL, we are unable to use any of
861 * the performance enhancing features of it without causing other
862 * subtle bugs, some of the bugs could include receive length
863 * corruption at high data rates (WTHRESH > 0) and/or receive
864 * descriptor ring irregularites (particularly in hardware cache) */
865 IXGB_WRITE_REG(hw, RXDCTL, 0);
866
867 /* Enable Receive Checksum Offload for TCP and UDP */
868 if (adapter->rx_csum) {
869 rxcsum = IXGB_READ_REG(hw, RXCSUM);
870 rxcsum |= IXGB_RXCSUM_TUOFL;
871 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
872 }
873
874 /* Enable Receives */
875
876 IXGB_WRITE_REG(hw, RCTL, rctl);
877 }
878
879 /**
880 * ixgb_free_tx_resources - Free Tx Resources
881 * @adapter: board private structure
882 *
883 * Free all transmit software resources
884 **/
885
886 void
887 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
888 {
889 struct pci_dev *pdev = adapter->pdev;
890
891 ixgb_clean_tx_ring(adapter);
892
893 vfree(adapter->tx_ring.buffer_info);
894 adapter->tx_ring.buffer_info = NULL;
895
896 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
897 adapter->tx_ring.desc, adapter->tx_ring.dma);
898
899 adapter->tx_ring.desc = NULL;
900 }
901
902 static void
903 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
904 struct ixgb_buffer *buffer_info)
905 {
906 if (buffer_info->dma) {
907 if (buffer_info->mapped_as_page)
908 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
909 buffer_info->length, DMA_TO_DEVICE);
910 else
911 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
912 buffer_info->length, DMA_TO_DEVICE);
913 buffer_info->dma = 0;
914 }
915
916 if (buffer_info->skb) {
917 dev_kfree_skb_any(buffer_info->skb);
918 buffer_info->skb = NULL;
919 }
920 buffer_info->time_stamp = 0;
921 /* these fields must always be initialized in tx
922 * buffer_info->length = 0;
923 * buffer_info->next_to_watch = 0; */
924 }
925
926 /**
927 * ixgb_clean_tx_ring - Free Tx Buffers
928 * @adapter: board private structure
929 **/
930
931 static void
932 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
933 {
934 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
935 struct ixgb_buffer *buffer_info;
936 unsigned long size;
937 unsigned int i;
938
939 /* Free all the Tx ring sk_buffs */
940
941 for (i = 0; i < tx_ring->count; i++) {
942 buffer_info = &tx_ring->buffer_info[i];
943 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
944 }
945
946 size = sizeof(struct ixgb_buffer) * tx_ring->count;
947 memset(tx_ring->buffer_info, 0, size);
948
949 /* Zero out the descriptor ring */
950
951 memset(tx_ring->desc, 0, tx_ring->size);
952
953 tx_ring->next_to_use = 0;
954 tx_ring->next_to_clean = 0;
955
956 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
957 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
958 }
959
960 /**
961 * ixgb_free_rx_resources - Free Rx Resources
962 * @adapter: board private structure
963 *
964 * Free all receive software resources
965 **/
966
967 void
968 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
969 {
970 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
971 struct pci_dev *pdev = adapter->pdev;
972
973 ixgb_clean_rx_ring(adapter);
974
975 vfree(rx_ring->buffer_info);
976 rx_ring->buffer_info = NULL;
977
978 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
979 rx_ring->dma);
980
981 rx_ring->desc = NULL;
982 }
983
984 /**
985 * ixgb_clean_rx_ring - Free Rx Buffers
986 * @adapter: board private structure
987 **/
988
989 static void
990 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
991 {
992 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
993 struct ixgb_buffer *buffer_info;
994 struct pci_dev *pdev = adapter->pdev;
995 unsigned long size;
996 unsigned int i;
997
998 /* Free all the Rx ring sk_buffs */
999
1000 for (i = 0; i < rx_ring->count; i++) {
1001 buffer_info = &rx_ring->buffer_info[i];
1002 if (buffer_info->dma) {
1003 dma_unmap_single(&pdev->dev,
1004 buffer_info->dma,
1005 buffer_info->length,
1006 DMA_FROM_DEVICE);
1007 buffer_info->dma = 0;
1008 buffer_info->length = 0;
1009 }
1010
1011 if (buffer_info->skb) {
1012 dev_kfree_skb(buffer_info->skb);
1013 buffer_info->skb = NULL;
1014 }
1015 }
1016
1017 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1018 memset(rx_ring->buffer_info, 0, size);
1019
1020 /* Zero out the descriptor ring */
1021
1022 memset(rx_ring->desc, 0, rx_ring->size);
1023
1024 rx_ring->next_to_clean = 0;
1025 rx_ring->next_to_use = 0;
1026
1027 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1028 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1029 }
1030
1031 /**
1032 * ixgb_set_mac - Change the Ethernet Address of the NIC
1033 * @netdev: network interface device structure
1034 * @p: pointer to an address structure
1035 *
1036 * Returns 0 on success, negative on failure
1037 **/
1038
1039 static int
1040 ixgb_set_mac(struct net_device *netdev, void *p)
1041 {
1042 struct ixgb_adapter *adapter = netdev_priv(netdev);
1043 struct sockaddr *addr = p;
1044
1045 if (!is_valid_ether_addr(addr->sa_data))
1046 return -EADDRNOTAVAIL;
1047
1048 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1049
1050 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1051
1052 return 0;
1053 }
1054
1055 /**
1056 * ixgb_set_multi - Multicast and Promiscuous mode set
1057 * @netdev: network interface device structure
1058 *
1059 * The set_multi entry point is called whenever the multicast address
1060 * list or the network interface flags are updated. This routine is
1061 * responsible for configuring the hardware for proper multicast,
1062 * promiscuous mode, and all-multi behavior.
1063 **/
1064
1065 static void
1066 ixgb_set_multi(struct net_device *netdev)
1067 {
1068 struct ixgb_adapter *adapter = netdev_priv(netdev);
1069 struct ixgb_hw *hw = &adapter->hw;
1070 struct netdev_hw_addr *ha;
1071 u32 rctl;
1072 int i;
1073
1074 /* Check for Promiscuous and All Multicast modes */
1075
1076 rctl = IXGB_READ_REG(hw, RCTL);
1077
1078 if (netdev->flags & IFF_PROMISC) {
1079 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1080 rctl &= ~IXGB_RCTL_VFE;
1081 } else {
1082 if (netdev->flags & IFF_ALLMULTI) {
1083 rctl |= IXGB_RCTL_MPE;
1084 rctl &= ~IXGB_RCTL_UPE;
1085 } else {
1086 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1087 }
1088 rctl |= IXGB_RCTL_VFE;
1089 }
1090
1091 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1092 rctl |= IXGB_RCTL_MPE;
1093 IXGB_WRITE_REG(hw, RCTL, rctl);
1094 } else {
1095 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1096 IXGB_ETH_LENGTH_OF_ADDRESS];
1097
1098 IXGB_WRITE_REG(hw, RCTL, rctl);
1099
1100 i = 0;
1101 netdev_for_each_mc_addr(ha, netdev)
1102 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1103 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1104
1105 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1106 }
1107 }
1108
1109 /**
1110 * ixgb_watchdog - Timer Call-back
1111 * @data: pointer to netdev cast into an unsigned long
1112 **/
1113
1114 static void
1115 ixgb_watchdog(unsigned long data)
1116 {
1117 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1118 struct net_device *netdev = adapter->netdev;
1119 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1120
1121 ixgb_check_for_link(&adapter->hw);
1122
1123 if (ixgb_check_for_bad_link(&adapter->hw)) {
1124 /* force the reset path */
1125 netif_stop_queue(netdev);
1126 }
1127
1128 if (adapter->hw.link_up) {
1129 if (!netif_carrier_ok(netdev)) {
1130 netdev_info(netdev,
1131 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1132 (adapter->hw.fc.type == ixgb_fc_full) ?
1133 "RX/TX" :
1134 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1135 "RX" :
1136 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1137 "TX" : "None");
1138 adapter->link_speed = 10000;
1139 adapter->link_duplex = FULL_DUPLEX;
1140 netif_carrier_on(netdev);
1141 }
1142 } else {
1143 if (netif_carrier_ok(netdev)) {
1144 adapter->link_speed = 0;
1145 adapter->link_duplex = 0;
1146 netdev_info(netdev, "NIC Link is Down\n");
1147 netif_carrier_off(netdev);
1148 }
1149 }
1150
1151 ixgb_update_stats(adapter);
1152
1153 if (!netif_carrier_ok(netdev)) {
1154 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1155 /* We've lost link, so the controller stops DMA,
1156 * but we've got queued Tx work that's never going
1157 * to get done, so reset controller to flush Tx.
1158 * (Do the reset outside of interrupt context). */
1159 schedule_work(&adapter->tx_timeout_task);
1160 /* return immediately since reset is imminent */
1161 return;
1162 }
1163 }
1164
1165 /* Force detection of hung controller every watchdog period */
1166 adapter->detect_tx_hung = true;
1167
1168 /* generate an interrupt to force clean up of any stragglers */
1169 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1170
1171 /* Reset the timer */
1172 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1173 }
1174
1175 #define IXGB_TX_FLAGS_CSUM 0x00000001
1176 #define IXGB_TX_FLAGS_VLAN 0x00000002
1177 #define IXGB_TX_FLAGS_TSO 0x00000004
1178
1179 static int
1180 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1181 {
1182 struct ixgb_context_desc *context_desc;
1183 unsigned int i;
1184 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1185 u16 ipcse, tucse, mss;
1186 int err;
1187
1188 if (likely(skb_is_gso(skb))) {
1189 struct ixgb_buffer *buffer_info;
1190 struct iphdr *iph;
1191
1192 if (skb_header_cloned(skb)) {
1193 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1194 if (err)
1195 return err;
1196 }
1197
1198 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1199 mss = skb_shinfo(skb)->gso_size;
1200 iph = ip_hdr(skb);
1201 iph->tot_len = 0;
1202 iph->check = 0;
1203 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1204 iph->daddr, 0,
1205 IPPROTO_TCP, 0);
1206 ipcss = skb_network_offset(skb);
1207 ipcso = (void *)&(iph->check) - (void *)skb->data;
1208 ipcse = skb_transport_offset(skb) - 1;
1209 tucss = skb_transport_offset(skb);
1210 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1211 tucse = 0;
1212
1213 i = adapter->tx_ring.next_to_use;
1214 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1215 buffer_info = &adapter->tx_ring.buffer_info[i];
1216 WARN_ON(buffer_info->dma != 0);
1217
1218 context_desc->ipcss = ipcss;
1219 context_desc->ipcso = ipcso;
1220 context_desc->ipcse = cpu_to_le16(ipcse);
1221 context_desc->tucss = tucss;
1222 context_desc->tucso = tucso;
1223 context_desc->tucse = cpu_to_le16(tucse);
1224 context_desc->mss = cpu_to_le16(mss);
1225 context_desc->hdr_len = hdr_len;
1226 context_desc->status = 0;
1227 context_desc->cmd_type_len = cpu_to_le32(
1228 IXGB_CONTEXT_DESC_TYPE
1229 | IXGB_CONTEXT_DESC_CMD_TSE
1230 | IXGB_CONTEXT_DESC_CMD_IP
1231 | IXGB_CONTEXT_DESC_CMD_TCP
1232 | IXGB_CONTEXT_DESC_CMD_IDE
1233 | (skb->len - (hdr_len)));
1234
1235
1236 if (++i == adapter->tx_ring.count) i = 0;
1237 adapter->tx_ring.next_to_use = i;
1238
1239 return 1;
1240 }
1241
1242 return 0;
1243 }
1244
1245 static bool
1246 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1247 {
1248 struct ixgb_context_desc *context_desc;
1249 unsigned int i;
1250 u8 css, cso;
1251
1252 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1253 struct ixgb_buffer *buffer_info;
1254 css = skb_transport_offset(skb);
1255 cso = css + skb->csum_offset;
1256
1257 i = adapter->tx_ring.next_to_use;
1258 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1259 buffer_info = &adapter->tx_ring.buffer_info[i];
1260 WARN_ON(buffer_info->dma != 0);
1261
1262 context_desc->tucss = css;
1263 context_desc->tucso = cso;
1264 context_desc->tucse = 0;
1265 /* zero out any previously existing data in one instruction */
1266 *(u32 *)&(context_desc->ipcss) = 0;
1267 context_desc->status = 0;
1268 context_desc->hdr_len = 0;
1269 context_desc->mss = 0;
1270 context_desc->cmd_type_len =
1271 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1272 | IXGB_TX_DESC_CMD_IDE);
1273
1274 if (++i == adapter->tx_ring.count) i = 0;
1275 adapter->tx_ring.next_to_use = i;
1276
1277 return true;
1278 }
1279
1280 return false;
1281 }
1282
1283 #define IXGB_MAX_TXD_PWR 14
1284 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1285
1286 static int
1287 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1288 unsigned int first)
1289 {
1290 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1291 struct pci_dev *pdev = adapter->pdev;
1292 struct ixgb_buffer *buffer_info;
1293 int len = skb_headlen(skb);
1294 unsigned int offset = 0, size, count = 0, i;
1295 unsigned int mss = skb_shinfo(skb)->gso_size;
1296 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1297 unsigned int f;
1298
1299 i = tx_ring->next_to_use;
1300
1301 while (len) {
1302 buffer_info = &tx_ring->buffer_info[i];
1303 size = min(len, IXGB_MAX_DATA_PER_TXD);
1304 /* Workaround for premature desc write-backs
1305 * in TSO mode. Append 4-byte sentinel desc */
1306 if (unlikely(mss && !nr_frags && size == len && size > 8))
1307 size -= 4;
1308
1309 buffer_info->length = size;
1310 WARN_ON(buffer_info->dma != 0);
1311 buffer_info->time_stamp = jiffies;
1312 buffer_info->mapped_as_page = false;
1313 buffer_info->dma = dma_map_single(&pdev->dev,
1314 skb->data + offset,
1315 size, DMA_TO_DEVICE);
1316 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1317 goto dma_error;
1318 buffer_info->next_to_watch = 0;
1319
1320 len -= size;
1321 offset += size;
1322 count++;
1323 if (len) {
1324 i++;
1325 if (i == tx_ring->count)
1326 i = 0;
1327 }
1328 }
1329
1330 for (f = 0; f < nr_frags; f++) {
1331 struct skb_frag_struct *frag;
1332
1333 frag = &skb_shinfo(skb)->frags[f];
1334 len = frag->size;
1335 offset = frag->page_offset;
1336
1337 while (len) {
1338 i++;
1339 if (i == tx_ring->count)
1340 i = 0;
1341
1342 buffer_info = &tx_ring->buffer_info[i];
1343 size = min(len, IXGB_MAX_DATA_PER_TXD);
1344
1345 /* Workaround for premature desc write-backs
1346 * in TSO mode. Append 4-byte sentinel desc */
1347 if (unlikely(mss && (f == (nr_frags - 1))
1348 && size == len && size > 8))
1349 size -= 4;
1350
1351 buffer_info->length = size;
1352 buffer_info->time_stamp = jiffies;
1353 buffer_info->mapped_as_page = true;
1354 buffer_info->dma =
1355 dma_map_page(&pdev->dev, frag->page,
1356 offset, size, DMA_TO_DEVICE);
1357 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1358 goto dma_error;
1359 buffer_info->next_to_watch = 0;
1360
1361 len -= size;
1362 offset += size;
1363 count++;
1364 }
1365 }
1366 tx_ring->buffer_info[i].skb = skb;
1367 tx_ring->buffer_info[first].next_to_watch = i;
1368
1369 return count;
1370
1371 dma_error:
1372 dev_err(&pdev->dev, "TX DMA map failed\n");
1373 buffer_info->dma = 0;
1374 if (count)
1375 count--;
1376
1377 while (count--) {
1378 if (i==0)
1379 i += tx_ring->count;
1380 i--;
1381 buffer_info = &tx_ring->buffer_info[i];
1382 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1383 }
1384
1385 return 0;
1386 }
1387
1388 static void
1389 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1390 {
1391 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1392 struct ixgb_tx_desc *tx_desc = NULL;
1393 struct ixgb_buffer *buffer_info;
1394 u32 cmd_type_len = adapter->tx_cmd_type;
1395 u8 status = 0;
1396 u8 popts = 0;
1397 unsigned int i;
1398
1399 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1400 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1401 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1402 }
1403
1404 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1405 popts |= IXGB_TX_DESC_POPTS_TXSM;
1406
1407 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1408 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1409
1410 i = tx_ring->next_to_use;
1411
1412 while (count--) {
1413 buffer_info = &tx_ring->buffer_info[i];
1414 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1415 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1416 tx_desc->cmd_type_len =
1417 cpu_to_le32(cmd_type_len | buffer_info->length);
1418 tx_desc->status = status;
1419 tx_desc->popts = popts;
1420 tx_desc->vlan = cpu_to_le16(vlan_id);
1421
1422 if (++i == tx_ring->count) i = 0;
1423 }
1424
1425 tx_desc->cmd_type_len |=
1426 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1427
1428 /* Force memory writes to complete before letting h/w
1429 * know there are new descriptors to fetch. (Only
1430 * applicable for weak-ordered memory model archs,
1431 * such as IA-64). */
1432 wmb();
1433
1434 tx_ring->next_to_use = i;
1435 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1436 }
1437
1438 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1439 {
1440 struct ixgb_adapter *adapter = netdev_priv(netdev);
1441 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1442
1443 netif_stop_queue(netdev);
1444 /* Herbert's original patch had:
1445 * smp_mb__after_netif_stop_queue();
1446 * but since that doesn't exist yet, just open code it. */
1447 smp_mb();
1448
1449 /* We need to check again in a case another CPU has just
1450 * made room available. */
1451 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1452 return -EBUSY;
1453
1454 /* A reprieve! */
1455 netif_start_queue(netdev);
1456 ++adapter->restart_queue;
1457 return 0;
1458 }
1459
1460 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1461 struct ixgb_desc_ring *tx_ring, int size)
1462 {
1463 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1464 return 0;
1465 return __ixgb_maybe_stop_tx(netdev, size);
1466 }
1467
1468
1469 /* Tx Descriptors needed, worst case */
1470 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1471 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1472 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1473 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1474 + 1 /* one more needed for sentinel TSO workaround */
1475
1476 static netdev_tx_t
1477 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1478 {
1479 struct ixgb_adapter *adapter = netdev_priv(netdev);
1480 unsigned int first;
1481 unsigned int tx_flags = 0;
1482 int vlan_id = 0;
1483 int count = 0;
1484 int tso;
1485
1486 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1487 dev_kfree_skb(skb);
1488 return NETDEV_TX_OK;
1489 }
1490
1491 if (skb->len <= 0) {
1492 dev_kfree_skb(skb);
1493 return NETDEV_TX_OK;
1494 }
1495
1496 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1497 DESC_NEEDED)))
1498 return NETDEV_TX_BUSY;
1499
1500 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1501 tx_flags |= IXGB_TX_FLAGS_VLAN;
1502 vlan_id = vlan_tx_tag_get(skb);
1503 }
1504
1505 first = adapter->tx_ring.next_to_use;
1506
1507 tso = ixgb_tso(adapter, skb);
1508 if (tso < 0) {
1509 dev_kfree_skb(skb);
1510 return NETDEV_TX_OK;
1511 }
1512
1513 if (likely(tso))
1514 tx_flags |= IXGB_TX_FLAGS_TSO;
1515 else if (ixgb_tx_csum(adapter, skb))
1516 tx_flags |= IXGB_TX_FLAGS_CSUM;
1517
1518 count = ixgb_tx_map(adapter, skb, first);
1519
1520 if (count) {
1521 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1522 /* Make sure there is space in the ring for the next send. */
1523 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1524
1525 } else {
1526 dev_kfree_skb_any(skb);
1527 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1528 adapter->tx_ring.next_to_use = first;
1529 }
1530
1531 return NETDEV_TX_OK;
1532 }
1533
1534 /**
1535 * ixgb_tx_timeout - Respond to a Tx Hang
1536 * @netdev: network interface device structure
1537 **/
1538
1539 static void
1540 ixgb_tx_timeout(struct net_device *netdev)
1541 {
1542 struct ixgb_adapter *adapter = netdev_priv(netdev);
1543
1544 /* Do the reset outside of interrupt context */
1545 schedule_work(&adapter->tx_timeout_task);
1546 }
1547
1548 static void
1549 ixgb_tx_timeout_task(struct work_struct *work)
1550 {
1551 struct ixgb_adapter *adapter =
1552 container_of(work, struct ixgb_adapter, tx_timeout_task);
1553
1554 adapter->tx_timeout_count++;
1555 ixgb_down(adapter, true);
1556 ixgb_up(adapter);
1557 }
1558
1559 /**
1560 * ixgb_get_stats - Get System Network Statistics
1561 * @netdev: network interface device structure
1562 *
1563 * Returns the address of the device statistics structure.
1564 * The statistics are actually updated from the timer callback.
1565 **/
1566
1567 static struct net_device_stats *
1568 ixgb_get_stats(struct net_device *netdev)
1569 {
1570 return &netdev->stats;
1571 }
1572
1573 /**
1574 * ixgb_change_mtu - Change the Maximum Transfer Unit
1575 * @netdev: network interface device structure
1576 * @new_mtu: new value for maximum frame size
1577 *
1578 * Returns 0 on success, negative on failure
1579 **/
1580
1581 static int
1582 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1583 {
1584 struct ixgb_adapter *adapter = netdev_priv(netdev);
1585 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1586 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1587
1588 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1589 if ((new_mtu < 68) ||
1590 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1591 netif_err(adapter, probe, adapter->netdev,
1592 "Invalid MTU setting %d\n", new_mtu);
1593 return -EINVAL;
1594 }
1595
1596 if (old_max_frame == max_frame)
1597 return 0;
1598
1599 if (netif_running(netdev))
1600 ixgb_down(adapter, true);
1601
1602 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1603
1604 netdev->mtu = new_mtu;
1605
1606 if (netif_running(netdev))
1607 ixgb_up(adapter);
1608
1609 return 0;
1610 }
1611
1612 /**
1613 * ixgb_update_stats - Update the board statistics counters.
1614 * @adapter: board private structure
1615 **/
1616
1617 void
1618 ixgb_update_stats(struct ixgb_adapter *adapter)
1619 {
1620 struct net_device *netdev = adapter->netdev;
1621 struct pci_dev *pdev = adapter->pdev;
1622
1623 /* Prevent stats update while adapter is being reset */
1624 if (pci_channel_offline(pdev))
1625 return;
1626
1627 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1628 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1629 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1630 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1631 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1632 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1633
1634 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1635 /* fix up multicast stats by removing broadcasts */
1636 if (multi >= bcast)
1637 multi -= bcast;
1638
1639 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1640 adapter->stats.mprch += (multi >> 32);
1641 adapter->stats.bprcl += bcast_l;
1642 adapter->stats.bprch += bcast_h;
1643 } else {
1644 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1645 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1646 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1647 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1648 }
1649 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1650 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1651 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1652 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1653 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1654 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1655 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1656 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1657 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1658 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1659 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1660 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1661 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1662 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1663 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1664 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1665 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1666 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1667 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1668 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1669 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1670 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1671 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1672 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1673 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1674 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1675 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1676 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1677 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1678 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1679 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1680 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1681 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1682 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1683 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1684 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1685 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1686 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1687 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1688 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1689 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1690 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1691 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1692 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1693 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1694 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1695 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1696 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1697 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1698 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1699 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1700 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1701 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1702 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1703 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1704 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1705
1706 /* Fill out the OS statistics structure */
1707
1708 netdev->stats.rx_packets = adapter->stats.gprcl;
1709 netdev->stats.tx_packets = adapter->stats.gptcl;
1710 netdev->stats.rx_bytes = adapter->stats.gorcl;
1711 netdev->stats.tx_bytes = adapter->stats.gotcl;
1712 netdev->stats.multicast = adapter->stats.mprcl;
1713 netdev->stats.collisions = 0;
1714
1715 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1716 * with a length in the type/len field */
1717 netdev->stats.rx_errors =
1718 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1719 adapter->stats.ruc +
1720 adapter->stats.roc /*+ adapter->stats.rlec */ +
1721 adapter->stats.icbc +
1722 adapter->stats.ecbc + adapter->stats.mpc;
1723
1724 /* see above
1725 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1726 */
1727
1728 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1729 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1730 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1731 netdev->stats.rx_over_errors = adapter->stats.mpc;
1732
1733 netdev->stats.tx_errors = 0;
1734 netdev->stats.rx_frame_errors = 0;
1735 netdev->stats.tx_aborted_errors = 0;
1736 netdev->stats.tx_carrier_errors = 0;
1737 netdev->stats.tx_fifo_errors = 0;
1738 netdev->stats.tx_heartbeat_errors = 0;
1739 netdev->stats.tx_window_errors = 0;
1740 }
1741
1742 #define IXGB_MAX_INTR 10
1743 /**
1744 * ixgb_intr - Interrupt Handler
1745 * @irq: interrupt number
1746 * @data: pointer to a network interface device structure
1747 **/
1748
1749 static irqreturn_t
1750 ixgb_intr(int irq, void *data)
1751 {
1752 struct net_device *netdev = data;
1753 struct ixgb_adapter *adapter = netdev_priv(netdev);
1754 struct ixgb_hw *hw = &adapter->hw;
1755 u32 icr = IXGB_READ_REG(hw, ICR);
1756
1757 if (unlikely(!icr))
1758 return IRQ_NONE; /* Not our interrupt */
1759
1760 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1761 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1762 mod_timer(&adapter->watchdog_timer, jiffies);
1763
1764 if (napi_schedule_prep(&adapter->napi)) {
1765
1766 /* Disable interrupts and register for poll. The flush
1767 of the posted write is intentionally left out.
1768 */
1769
1770 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1771 __napi_schedule(&adapter->napi);
1772 }
1773 return IRQ_HANDLED;
1774 }
1775
1776 /**
1777 * ixgb_clean - NAPI Rx polling callback
1778 * @adapter: board private structure
1779 **/
1780
1781 static int
1782 ixgb_clean(struct napi_struct *napi, int budget)
1783 {
1784 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1785 int work_done = 0;
1786
1787 ixgb_clean_tx_irq(adapter);
1788 ixgb_clean_rx_irq(adapter, &work_done, budget);
1789
1790 /* If budget not fully consumed, exit the polling mode */
1791 if (work_done < budget) {
1792 napi_complete(napi);
1793 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1794 ixgb_irq_enable(adapter);
1795 }
1796
1797 return work_done;
1798 }
1799
1800 /**
1801 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1802 * @adapter: board private structure
1803 **/
1804
1805 static bool
1806 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1807 {
1808 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1809 struct net_device *netdev = adapter->netdev;
1810 struct ixgb_tx_desc *tx_desc, *eop_desc;
1811 struct ixgb_buffer *buffer_info;
1812 unsigned int i, eop;
1813 bool cleaned = false;
1814
1815 i = tx_ring->next_to_clean;
1816 eop = tx_ring->buffer_info[i].next_to_watch;
1817 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1818
1819 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1820
1821 rmb(); /* read buffer_info after eop_desc */
1822 for (cleaned = false; !cleaned; ) {
1823 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1824 buffer_info = &tx_ring->buffer_info[i];
1825
1826 if (tx_desc->popts &
1827 (IXGB_TX_DESC_POPTS_TXSM |
1828 IXGB_TX_DESC_POPTS_IXSM))
1829 adapter->hw_csum_tx_good++;
1830
1831 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1832
1833 *(u32 *)&(tx_desc->status) = 0;
1834
1835 cleaned = (i == eop);
1836 if (++i == tx_ring->count) i = 0;
1837 }
1838
1839 eop = tx_ring->buffer_info[i].next_to_watch;
1840 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1841 }
1842
1843 tx_ring->next_to_clean = i;
1844
1845 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1846 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1847 /* Make sure that anybody stopping the queue after this
1848 * sees the new next_to_clean. */
1849 smp_mb();
1850
1851 if (netif_queue_stopped(netdev) &&
1852 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1853 netif_wake_queue(netdev);
1854 ++adapter->restart_queue;
1855 }
1856 }
1857
1858 if (adapter->detect_tx_hung) {
1859 /* detect a transmit hang in hardware, this serializes the
1860 * check with the clearing of time_stamp and movement of i */
1861 adapter->detect_tx_hung = false;
1862 if (tx_ring->buffer_info[eop].time_stamp &&
1863 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1864 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1865 IXGB_STATUS_TXOFF)) {
1866 /* detected Tx unit hang */
1867 netif_err(adapter, drv, adapter->netdev,
1868 "Detected Tx Unit Hang\n"
1869 " TDH <%x>\n"
1870 " TDT <%x>\n"
1871 " next_to_use <%x>\n"
1872 " next_to_clean <%x>\n"
1873 "buffer_info[next_to_clean]\n"
1874 " time_stamp <%lx>\n"
1875 " next_to_watch <%x>\n"
1876 " jiffies <%lx>\n"
1877 " next_to_watch.status <%x>\n",
1878 IXGB_READ_REG(&adapter->hw, TDH),
1879 IXGB_READ_REG(&adapter->hw, TDT),
1880 tx_ring->next_to_use,
1881 tx_ring->next_to_clean,
1882 tx_ring->buffer_info[eop].time_stamp,
1883 eop,
1884 jiffies,
1885 eop_desc->status);
1886 netif_stop_queue(netdev);
1887 }
1888 }
1889
1890 return cleaned;
1891 }
1892
1893 /**
1894 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1895 * @adapter: board private structure
1896 * @rx_desc: receive descriptor
1897 * @sk_buff: socket buffer with received data
1898 **/
1899
1900 static void
1901 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1902 struct ixgb_rx_desc *rx_desc,
1903 struct sk_buff *skb)
1904 {
1905 /* Ignore Checksum bit is set OR
1906 * TCP Checksum has not been calculated
1907 */
1908 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1909 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1910 skb_checksum_none_assert(skb);
1911 return;
1912 }
1913
1914 /* At this point we know the hardware did the TCP checksum */
1915 /* now look at the TCP checksum error bit */
1916 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1917 /* let the stack verify checksum errors */
1918 skb_checksum_none_assert(skb);
1919 adapter->hw_csum_rx_error++;
1920 } else {
1921 /* TCP checksum is good */
1922 skb->ip_summed = CHECKSUM_UNNECESSARY;
1923 adapter->hw_csum_rx_good++;
1924 }
1925 }
1926
1927 /*
1928 * this should improve performance for small packets with large amounts
1929 * of reassembly being done in the stack
1930 */
1931 static void ixgb_check_copybreak(struct net_device *netdev,
1932 struct ixgb_buffer *buffer_info,
1933 u32 length, struct sk_buff **skb)
1934 {
1935 struct sk_buff *new_skb;
1936
1937 if (length > copybreak)
1938 return;
1939
1940 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1941 if (!new_skb)
1942 return;
1943
1944 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1945 (*skb)->data - NET_IP_ALIGN,
1946 length + NET_IP_ALIGN);
1947 /* save the skb in buffer_info as good */
1948 buffer_info->skb = *skb;
1949 *skb = new_skb;
1950 }
1951
1952 /**
1953 * ixgb_clean_rx_irq - Send received data up the network stack,
1954 * @adapter: board private structure
1955 **/
1956
1957 static bool
1958 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1959 {
1960 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1961 struct net_device *netdev = adapter->netdev;
1962 struct pci_dev *pdev = adapter->pdev;
1963 struct ixgb_rx_desc *rx_desc, *next_rxd;
1964 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1965 u32 length;
1966 unsigned int i, j;
1967 int cleaned_count = 0;
1968 bool cleaned = false;
1969
1970 i = rx_ring->next_to_clean;
1971 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1972 buffer_info = &rx_ring->buffer_info[i];
1973
1974 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1975 struct sk_buff *skb;
1976 u8 status;
1977
1978 if (*work_done >= work_to_do)
1979 break;
1980
1981 (*work_done)++;
1982 rmb(); /* read descriptor and rx_buffer_info after status DD */
1983 status = rx_desc->status;
1984 skb = buffer_info->skb;
1985 buffer_info->skb = NULL;
1986
1987 prefetch(skb->data - NET_IP_ALIGN);
1988
1989 if (++i == rx_ring->count)
1990 i = 0;
1991 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1992 prefetch(next_rxd);
1993
1994 j = i + 1;
1995 if (j == rx_ring->count)
1996 j = 0;
1997 next2_buffer = &rx_ring->buffer_info[j];
1998 prefetch(next2_buffer);
1999
2000 next_buffer = &rx_ring->buffer_info[i];
2001
2002 cleaned = true;
2003 cleaned_count++;
2004
2005 dma_unmap_single(&pdev->dev,
2006 buffer_info->dma,
2007 buffer_info->length,
2008 DMA_FROM_DEVICE);
2009 buffer_info->dma = 0;
2010
2011 length = le16_to_cpu(rx_desc->length);
2012 rx_desc->length = 0;
2013
2014 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2015
2016 /* All receives must fit into a single buffer */
2017
2018 IXGB_DBG("Receive packet consumed multiple buffers "
2019 "length<%x>\n", length);
2020
2021 dev_kfree_skb_irq(skb);
2022 goto rxdesc_done;
2023 }
2024
2025 if (unlikely(rx_desc->errors &
2026 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2027 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2028 dev_kfree_skb_irq(skb);
2029 goto rxdesc_done;
2030 }
2031
2032 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2033
2034 /* Good Receive */
2035 skb_put(skb, length);
2036
2037 /* Receive Checksum Offload */
2038 ixgb_rx_checksum(adapter, rx_desc, skb);
2039
2040 skb->protocol = eth_type_trans(skb, netdev);
2041 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2042 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2043 le16_to_cpu(rx_desc->special));
2044 } else {
2045 netif_receive_skb(skb);
2046 }
2047
2048 rxdesc_done:
2049 /* clean up descriptor, might be written over by hw */
2050 rx_desc->status = 0;
2051
2052 /* return some buffers to hardware, one at a time is too slow */
2053 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2054 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2055 cleaned_count = 0;
2056 }
2057
2058 /* use prefetched values */
2059 rx_desc = next_rxd;
2060 buffer_info = next_buffer;
2061 }
2062
2063 rx_ring->next_to_clean = i;
2064
2065 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2066 if (cleaned_count)
2067 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2068
2069 return cleaned;
2070 }
2071
2072 /**
2073 * ixgb_alloc_rx_buffers - Replace used receive buffers
2074 * @adapter: address of board private structure
2075 **/
2076
2077 static void
2078 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2079 {
2080 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2081 struct net_device *netdev = adapter->netdev;
2082 struct pci_dev *pdev = adapter->pdev;
2083 struct ixgb_rx_desc *rx_desc;
2084 struct ixgb_buffer *buffer_info;
2085 struct sk_buff *skb;
2086 unsigned int i;
2087 long cleancount;
2088
2089 i = rx_ring->next_to_use;
2090 buffer_info = &rx_ring->buffer_info[i];
2091 cleancount = IXGB_DESC_UNUSED(rx_ring);
2092
2093
2094 /* leave three descriptors unused */
2095 while (--cleancount > 2 && cleaned_count--) {
2096 /* recycle! its good for you */
2097 skb = buffer_info->skb;
2098 if (skb) {
2099 skb_trim(skb, 0);
2100 goto map_skb;
2101 }
2102
2103 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2104 if (unlikely(!skb)) {
2105 /* Better luck next round */
2106 adapter->alloc_rx_buff_failed++;
2107 break;
2108 }
2109
2110 buffer_info->skb = skb;
2111 buffer_info->length = adapter->rx_buffer_len;
2112 map_skb:
2113 buffer_info->dma = dma_map_single(&pdev->dev,
2114 skb->data,
2115 adapter->rx_buffer_len,
2116 DMA_FROM_DEVICE);
2117
2118 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2119 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2120 /* guarantee DD bit not set now before h/w gets descriptor
2121 * this is the rest of the workaround for h/w double
2122 * writeback. */
2123 rx_desc->status = 0;
2124
2125
2126 if (++i == rx_ring->count) i = 0;
2127 buffer_info = &rx_ring->buffer_info[i];
2128 }
2129
2130 if (likely(rx_ring->next_to_use != i)) {
2131 rx_ring->next_to_use = i;
2132 if (unlikely(i-- == 0))
2133 i = (rx_ring->count - 1);
2134
2135 /* Force memory writes to complete before letting h/w
2136 * know there are new descriptors to fetch. (Only
2137 * applicable for weak-ordered memory model archs, such
2138 * as IA-64). */
2139 wmb();
2140 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2141 }
2142 }
2143
2144 /**
2145 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2146 *
2147 * @param netdev network interface device structure
2148 * @param grp indicates to enable or disable tagging/stripping
2149 **/
2150 static void
2151 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2152 {
2153 struct ixgb_adapter *adapter = netdev_priv(netdev);
2154 u32 ctrl, rctl;
2155
2156 ixgb_irq_disable(adapter);
2157 adapter->vlgrp = grp;
2158
2159 if (grp) {
2160 /* enable VLAN tag insert/strip */
2161 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2162 ctrl |= IXGB_CTRL0_VME;
2163 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2164
2165 /* enable VLAN receive filtering */
2166
2167 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2168 rctl &= ~IXGB_RCTL_CFIEN;
2169 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2170 } else {
2171 /* disable VLAN tag insert/strip */
2172
2173 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2174 ctrl &= ~IXGB_CTRL0_VME;
2175 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2176 }
2177
2178 /* don't enable interrupts unless we are UP */
2179 if (adapter->netdev->flags & IFF_UP)
2180 ixgb_irq_enable(adapter);
2181 }
2182
2183 static void
2184 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2185 {
2186 struct ixgb_adapter *adapter = netdev_priv(netdev);
2187 u32 vfta, index;
2188
2189 /* add VID to filter table */
2190
2191 index = (vid >> 5) & 0x7F;
2192 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2193 vfta |= (1 << (vid & 0x1F));
2194 ixgb_write_vfta(&adapter->hw, index, vfta);
2195 }
2196
2197 static void
2198 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2199 {
2200 struct ixgb_adapter *adapter = netdev_priv(netdev);
2201 u32 vfta, index;
2202
2203 ixgb_irq_disable(adapter);
2204
2205 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2206
2207 /* don't enable interrupts unless we are UP */
2208 if (adapter->netdev->flags & IFF_UP)
2209 ixgb_irq_enable(adapter);
2210
2211 /* remove VID from filter table */
2212
2213 index = (vid >> 5) & 0x7F;
2214 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2215 vfta &= ~(1 << (vid & 0x1F));
2216 ixgb_write_vfta(&adapter->hw, index, vfta);
2217 }
2218
2219 static void
2220 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2221 {
2222 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2223
2224 if (adapter->vlgrp) {
2225 u16 vid;
2226 for (vid = 0; vid < VLAN_N_VID; vid++) {
2227 if (!vlan_group_get_device(adapter->vlgrp, vid))
2228 continue;
2229 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2230 }
2231 }
2232 }
2233
2234 #ifdef CONFIG_NET_POLL_CONTROLLER
2235 /*
2236 * Polling 'interrupt' - used by things like netconsole to send skbs
2237 * without having to re-enable interrupts. It's not called while
2238 * the interrupt routine is executing.
2239 */
2240
2241 static void ixgb_netpoll(struct net_device *dev)
2242 {
2243 struct ixgb_adapter *adapter = netdev_priv(dev);
2244
2245 disable_irq(adapter->pdev->irq);
2246 ixgb_intr(adapter->pdev->irq, dev);
2247 enable_irq(adapter->pdev->irq);
2248 }
2249 #endif
2250
2251 /**
2252 * ixgb_io_error_detected() - called when PCI error is detected
2253 * @pdev pointer to pci device with error
2254 * @state pci channel state after error
2255 *
2256 * This callback is called by the PCI subsystem whenever
2257 * a PCI bus error is detected.
2258 */
2259 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2260 enum pci_channel_state state)
2261 {
2262 struct net_device *netdev = pci_get_drvdata(pdev);
2263 struct ixgb_adapter *adapter = netdev_priv(netdev);
2264
2265 netif_device_detach(netdev);
2266
2267 if (state == pci_channel_io_perm_failure)
2268 return PCI_ERS_RESULT_DISCONNECT;
2269
2270 if (netif_running(netdev))
2271 ixgb_down(adapter, true);
2272
2273 pci_disable_device(pdev);
2274
2275 /* Request a slot reset. */
2276 return PCI_ERS_RESULT_NEED_RESET;
2277 }
2278
2279 /**
2280 * ixgb_io_slot_reset - called after the pci bus has been reset.
2281 * @pdev pointer to pci device with error
2282 *
2283 * This callback is called after the PCI bus has been reset.
2284 * Basically, this tries to restart the card from scratch.
2285 * This is a shortened version of the device probe/discovery code,
2286 * it resembles the first-half of the ixgb_probe() routine.
2287 */
2288 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2289 {
2290 struct net_device *netdev = pci_get_drvdata(pdev);
2291 struct ixgb_adapter *adapter = netdev_priv(netdev);
2292
2293 if (pci_enable_device(pdev)) {
2294 netif_err(adapter, probe, adapter->netdev,
2295 "Cannot re-enable PCI device after reset\n");
2296 return PCI_ERS_RESULT_DISCONNECT;
2297 }
2298
2299 /* Perform card reset only on one instance of the card */
2300 if (0 != PCI_FUNC (pdev->devfn))
2301 return PCI_ERS_RESULT_RECOVERED;
2302
2303 pci_set_master(pdev);
2304
2305 netif_carrier_off(netdev);
2306 netif_stop_queue(netdev);
2307 ixgb_reset(adapter);
2308
2309 /* Make sure the EEPROM is good */
2310 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2311 netif_err(adapter, probe, adapter->netdev,
2312 "After reset, the EEPROM checksum is not valid\n");
2313 return PCI_ERS_RESULT_DISCONNECT;
2314 }
2315 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2316 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2317
2318 if (!is_valid_ether_addr(netdev->perm_addr)) {
2319 netif_err(adapter, probe, adapter->netdev,
2320 "After reset, invalid MAC address\n");
2321 return PCI_ERS_RESULT_DISCONNECT;
2322 }
2323
2324 return PCI_ERS_RESULT_RECOVERED;
2325 }
2326
2327 /**
2328 * ixgb_io_resume - called when its OK to resume normal operations
2329 * @pdev pointer to pci device with error
2330 *
2331 * The error recovery driver tells us that its OK to resume
2332 * normal operation. Implementation resembles the second-half
2333 * of the ixgb_probe() routine.
2334 */
2335 static void ixgb_io_resume(struct pci_dev *pdev)
2336 {
2337 struct net_device *netdev = pci_get_drvdata(pdev);
2338 struct ixgb_adapter *adapter = netdev_priv(netdev);
2339
2340 pci_set_master(pdev);
2341
2342 if (netif_running(netdev)) {
2343 if (ixgb_up(adapter)) {
2344 pr_err("can't bring device back up after reset\n");
2345 return;
2346 }
2347 }
2348
2349 netif_device_attach(netdev);
2350 mod_timer(&adapter->watchdog_timer, jiffies);
2351 }
2352
2353 /* ixgb_main.c */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree