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[linux-rt-nao.git] / drivers / net / ixgb / ixgb_main.c
blobeee28d3956827cb8dcb3951df9738ab6c9cd54e6
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 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #define DRIVERNAPI "-NAPI"
35 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
36 const char ixgb_driver_version[] = DRV_VERSION;
37 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
38
39 #define IXGB_CB_LENGTH 256
40 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
41 module_param(copybreak, uint, 0644);
42 MODULE_PARM_DESC(copybreak,
43 "Maximum size of packet that is copied to a new buffer on receive");
44
45 /* ixgb_pci_tbl - PCI Device ID Table
46 *
47 * Wildcard entries (PCI_ANY_ID) should come last
48 * Last entry must be all 0s
49 *
50 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
51 * Class, Class Mask, private data (not used) }
52 */
53 static struct pci_device_id ixgb_pci_tbl[] = {
54 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
55 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62
63 /* required last entry */
64 {0,}
65 };
66
67 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
68
69 /* Local Function Prototypes */
70 static int ixgb_init_module(void);
71 static void ixgb_exit_module(void);
72 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
73 static void __devexit ixgb_remove(struct pci_dev *pdev);
74 static int ixgb_sw_init(struct ixgb_adapter *adapter);
75 static int ixgb_open(struct net_device *netdev);
76 static int ixgb_close(struct net_device *netdev);
77 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
78 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
79 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
80 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
81 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
82 static void ixgb_set_multi(struct net_device *netdev);
83 static void ixgb_watchdog(unsigned long data);
84 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
85 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
86 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
87 static int ixgb_set_mac(struct net_device *netdev, void *p);
88 static irqreturn_t ixgb_intr(int irq, void *data);
89 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
90
91 static int ixgb_clean(struct napi_struct *, int);
92 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
93 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
94
95 static void ixgb_tx_timeout(struct net_device *dev);
96 static void ixgb_tx_timeout_task(struct work_struct *work);
97
98 static void ixgb_vlan_rx_register(struct net_device *netdev,
99 struct vlan_group *grp);
100 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
101 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
102 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
103
104 #ifdef CONFIG_NET_POLL_CONTROLLER
105 /* for netdump / net console */
106 static void ixgb_netpoll(struct net_device *dev);
107 #endif
108
109 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
110 enum pci_channel_state state);
111 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
112 static void ixgb_io_resume (struct pci_dev *pdev);
113
114 static struct pci_error_handlers ixgb_err_handler = {
115 .error_detected = ixgb_io_error_detected,
116 .slot_reset = ixgb_io_slot_reset,
117 .resume = ixgb_io_resume,
118 };
119
120 static struct pci_driver ixgb_driver = {
121 .name = ixgb_driver_name,
122 .id_table = ixgb_pci_tbl,
123 .probe = ixgb_probe,
124 .remove = __devexit_p(ixgb_remove),
125 .err_handler = &ixgb_err_handler
126 };
127
128 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
129 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
130 MODULE_LICENSE("GPL");
131 MODULE_VERSION(DRV_VERSION);
132
133 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
134 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
135 module_param(debug, int, 0);
136 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
137
138 /**
139 * ixgb_init_module - Driver Registration Routine
140 *
141 * ixgb_init_module is the first routine called when the driver is
142 * loaded. All it does is register with the PCI subsystem.
143 **/
144
145 static int __init
146 ixgb_init_module(void)
147 {
148 printk(KERN_INFO "%s - version %s\n",
149 ixgb_driver_string, ixgb_driver_version);
150
151 printk(KERN_INFO "%s\n", ixgb_copyright);
152
153 return pci_register_driver(&ixgb_driver);
154 }
155
156 module_init(ixgb_init_module);
157
158 /**
159 * ixgb_exit_module - Driver Exit Cleanup Routine
160 *
161 * ixgb_exit_module is called just before the driver is removed
162 * from memory.
163 **/
164
165 static void __exit
166 ixgb_exit_module(void)
167 {
168 pci_unregister_driver(&ixgb_driver);
169 }
170
171 module_exit(ixgb_exit_module);
172
173 /**
174 * ixgb_irq_disable - Mask off interrupt generation on the NIC
175 * @adapter: board private structure
176 **/
177
178 static void
179 ixgb_irq_disable(struct ixgb_adapter *adapter)
180 {
181 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
182 IXGB_WRITE_FLUSH(&adapter->hw);
183 synchronize_irq(adapter->pdev->irq);
184 }
185
186 /**
187 * ixgb_irq_enable - Enable default interrupt generation settings
188 * @adapter: board private structure
189 **/
190
191 static void
192 ixgb_irq_enable(struct ixgb_adapter *adapter)
193 {
194 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
195 IXGB_INT_TXDW | IXGB_INT_LSC;
196 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
197 val |= IXGB_INT_GPI0;
198 IXGB_WRITE_REG(&adapter->hw, IMS, val);
199 IXGB_WRITE_FLUSH(&adapter->hw);
200 }
201
202 int
203 ixgb_up(struct ixgb_adapter *adapter)
204 {
205 struct net_device *netdev = adapter->netdev;
206 int err, irq_flags = IRQF_SHARED;
207 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
208 struct ixgb_hw *hw = &adapter->hw;
209
210 /* hardware has been reset, we need to reload some things */
211
212 ixgb_rar_set(hw, netdev->dev_addr, 0);
213 ixgb_set_multi(netdev);
214
215 ixgb_restore_vlan(adapter);
216
217 ixgb_configure_tx(adapter);
218 ixgb_setup_rctl(adapter);
219 ixgb_configure_rx(adapter);
220 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
221
222 /* disable interrupts and get the hardware into a known state */
223 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
224
225 /* only enable MSI if bus is in PCI-X mode */
226 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
227 err = pci_enable_msi(adapter->pdev);
228 if (!err) {
229 adapter->have_msi = 1;
230 irq_flags = 0;
231 }
232 /* proceed to try to request regular interrupt */
233 }
234
235 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
236 netdev->name, netdev);
237 if (err) {
238 if (adapter->have_msi)
239 pci_disable_msi(adapter->pdev);
240 DPRINTK(PROBE, ERR,
241 "Unable to allocate interrupt Error: %d\n", err);
242 return err;
243 }
244
245 if ((hw->max_frame_size != max_frame) ||
246 (hw->max_frame_size !=
247 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
248
249 hw->max_frame_size = max_frame;
250
251 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
252
253 if (hw->max_frame_size >
254 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
255 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
256
257 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
258 ctrl0 |= IXGB_CTRL0_JFE;
259 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
260 }
261 }
262 }
263
264 clear_bit(__IXGB_DOWN, &adapter->flags);
265
266 napi_enable(&adapter->napi);
267 ixgb_irq_enable(adapter);
268
269 mod_timer(&adapter->watchdog_timer, jiffies);
270
271 return 0;
272 }
273
274 void
275 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
276 {
277 struct net_device *netdev = adapter->netdev;
278
279 /* prevent the interrupt handler from restarting watchdog */
280 set_bit(__IXGB_DOWN, &adapter->flags);
281
282 napi_disable(&adapter->napi);
283 /* waiting for NAPI to complete can re-enable interrupts */
284 ixgb_irq_disable(adapter);
285 free_irq(adapter->pdev->irq, netdev);
286
287 if (adapter->have_msi)
288 pci_disable_msi(adapter->pdev);
289
290 if (kill_watchdog)
291 del_timer_sync(&adapter->watchdog_timer);
292
293 adapter->link_speed = 0;
294 adapter->link_duplex = 0;
295 netif_carrier_off(netdev);
296 netif_stop_queue(netdev);
297
298 ixgb_reset(adapter);
299 ixgb_clean_tx_ring(adapter);
300 ixgb_clean_rx_ring(adapter);
301 }
302
303 void
304 ixgb_reset(struct ixgb_adapter *adapter)
305 {
306 struct ixgb_hw *hw = &adapter->hw;
307
308 ixgb_adapter_stop(hw);
309 if (!ixgb_init_hw(hw))
310 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
311
312 /* restore frame size information */
313 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
314 if (hw->max_frame_size >
315 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
316 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
317 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
318 ctrl0 |= IXGB_CTRL0_JFE;
319 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
320 }
321 }
322 }
323
324 static const struct net_device_ops ixgb_netdev_ops = {
325 .ndo_open = ixgb_open,
326 .ndo_stop = ixgb_close,
327 .ndo_start_xmit = ixgb_xmit_frame,
328 .ndo_get_stats = ixgb_get_stats,
329 .ndo_set_multicast_list = ixgb_set_multi,
330 .ndo_validate_addr = eth_validate_addr,
331 .ndo_set_mac_address = ixgb_set_mac,
332 .ndo_change_mtu = ixgb_change_mtu,
333 .ndo_tx_timeout = ixgb_tx_timeout,
334 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
335 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
336 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
337 #ifdef CONFIG_NET_POLL_CONTROLLER
338 .ndo_poll_controller = ixgb_netpoll,
339 #endif
340 };
341
342 /**
343 * ixgb_probe - Device Initialization Routine
344 * @pdev: PCI device information struct
345 * @ent: entry in ixgb_pci_tbl
346 *
347 * Returns 0 on success, negative on failure
348 *
349 * ixgb_probe initializes an adapter identified by a pci_dev structure.
350 * The OS initialization, configuring of the adapter private structure,
351 * and a hardware reset occur.
352 **/
353
354 static int __devinit
355 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
356 {
357 struct net_device *netdev = NULL;
358 struct ixgb_adapter *adapter;
359 static int cards_found = 0;
360 int pci_using_dac;
361 int i;
362 int err;
363
364 err = pci_enable_device(pdev);
365 if (err)
366 return err;
367
368 if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
369 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
370 pci_using_dac = 1;
371 } else {
372 if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
373 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
374 printk(KERN_ERR
375 "ixgb: No usable DMA configuration, aborting\n");
376 goto err_dma_mask;
377 }
378 pci_using_dac = 0;
379 }
380
381 err = pci_request_regions(pdev, ixgb_driver_name);
382 if (err)
383 goto err_request_regions;
384
385 pci_set_master(pdev);
386
387 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
388 if (!netdev) {
389 err = -ENOMEM;
390 goto err_alloc_etherdev;
391 }
392
393 SET_NETDEV_DEV(netdev, &pdev->dev);
394
395 pci_set_drvdata(pdev, netdev);
396 adapter = netdev_priv(netdev);
397 adapter->netdev = netdev;
398 adapter->pdev = pdev;
399 adapter->hw.back = adapter;
400 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
401
402 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
403 if (!adapter->hw.hw_addr) {
404 err = -EIO;
405 goto err_ioremap;
406 }
407
408 for (i = BAR_1; i <= BAR_5; i++) {
409 if (pci_resource_len(pdev, i) == 0)
410 continue;
411 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
412 adapter->hw.io_base = pci_resource_start(pdev, i);
413 break;
414 }
415 }
416
417 netdev->netdev_ops = &ixgb_netdev_ops;
418 ixgb_set_ethtool_ops(netdev);
419 netdev->watchdog_timeo = 5 * HZ;
420 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
421
422 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
423
424 adapter->bd_number = cards_found;
425 adapter->link_speed = 0;
426 adapter->link_duplex = 0;
427
428 /* setup the private structure */
429
430 err = ixgb_sw_init(adapter);
431 if (err)
432 goto err_sw_init;
433
434 netdev->features = NETIF_F_SG |
435 NETIF_F_HW_CSUM |
436 NETIF_F_HW_VLAN_TX |
437 NETIF_F_HW_VLAN_RX |
438 NETIF_F_HW_VLAN_FILTER;
439 netdev->features |= NETIF_F_TSO;
440
441 if (pci_using_dac)
442 netdev->features |= NETIF_F_HIGHDMA;
443
444 /* make sure the EEPROM is good */
445
446 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
447 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
448 err = -EIO;
449 goto err_eeprom;
450 }
451
452 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
453 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
454
455 if (!is_valid_ether_addr(netdev->perm_addr)) {
456 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
457 err = -EIO;
458 goto err_eeprom;
459 }
460
461 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
462
463 init_timer(&adapter->watchdog_timer);
464 adapter->watchdog_timer.function = &ixgb_watchdog;
465 adapter->watchdog_timer.data = (unsigned long)adapter;
466
467 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
468
469 strcpy(netdev->name, "eth%d");
470 err = register_netdev(netdev);
471 if (err)
472 goto err_register;
473
474 /* we're going to reset, so assume we have no link for now */
475
476 netif_carrier_off(netdev);
477 netif_stop_queue(netdev);
478
479 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
480 ixgb_check_options(adapter);
481 /* reset the hardware with the new settings */
482
483 ixgb_reset(adapter);
484
485 cards_found++;
486 return 0;
487
488 err_register:
489 err_sw_init:
490 err_eeprom:
491 iounmap(adapter->hw.hw_addr);
492 err_ioremap:
493 free_netdev(netdev);
494 err_alloc_etherdev:
495 pci_release_regions(pdev);
496 err_request_regions:
497 err_dma_mask:
498 pci_disable_device(pdev);
499 return err;
500 }
501
502 /**
503 * ixgb_remove - Device Removal Routine
504 * @pdev: PCI device information struct
505 *
506 * ixgb_remove is called by the PCI subsystem to alert the driver
507 * that it should release a PCI device. The could be caused by a
508 * Hot-Plug event, or because the driver is going to be removed from
509 * memory.
510 **/
511
512 static void __devexit
513 ixgb_remove(struct pci_dev *pdev)
514 {
515 struct net_device *netdev = pci_get_drvdata(pdev);
516 struct ixgb_adapter *adapter = netdev_priv(netdev);
517
518 flush_scheduled_work();
519
520 unregister_netdev(netdev);
521
522 iounmap(adapter->hw.hw_addr);
523 pci_release_regions(pdev);
524
525 free_netdev(netdev);
526 }
527
528 /**
529 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
530 * @adapter: board private structure to initialize
531 *
532 * ixgb_sw_init initializes the Adapter private data structure.
533 * Fields are initialized based on PCI device information and
534 * OS network device settings (MTU size).
535 **/
536
537 static int __devinit
538 ixgb_sw_init(struct ixgb_adapter *adapter)
539 {
540 struct ixgb_hw *hw = &adapter->hw;
541 struct net_device *netdev = adapter->netdev;
542 struct pci_dev *pdev = adapter->pdev;
543
544 /* PCI config space info */
545
546 hw->vendor_id = pdev->vendor;
547 hw->device_id = pdev->device;
548 hw->subsystem_vendor_id = pdev->subsystem_vendor;
549 hw->subsystem_id = pdev->subsystem_device;
550
551 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
552 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
553
554 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
555 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
556 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
557 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
558 hw->mac_type = ixgb_82597;
559 else {
560 /* should never have loaded on this device */
561 DPRINTK(PROBE, ERR, "unsupported device id\n");
562 }
563
564 /* enable flow control to be programmed */
565 hw->fc.send_xon = 1;
566
567 set_bit(__IXGB_DOWN, &adapter->flags);
568 return 0;
569 }
570
571 /**
572 * ixgb_open - Called when a network interface is made active
573 * @netdev: network interface device structure
574 *
575 * Returns 0 on success, negative value on failure
576 *
577 * The open entry point is called when a network interface is made
578 * active by the system (IFF_UP). At this point all resources needed
579 * for transmit and receive operations are allocated, the interrupt
580 * handler is registered with the OS, the watchdog timer is started,
581 * and the stack is notified that the interface is ready.
582 **/
583
584 static int
585 ixgb_open(struct net_device *netdev)
586 {
587 struct ixgb_adapter *adapter = netdev_priv(netdev);
588 int err;
589
590 /* allocate transmit descriptors */
591 err = ixgb_setup_tx_resources(adapter);
592 if (err)
593 goto err_setup_tx;
594
595 /* allocate receive descriptors */
596
597 err = ixgb_setup_rx_resources(adapter);
598 if (err)
599 goto err_setup_rx;
600
601 err = ixgb_up(adapter);
602 if (err)
603 goto err_up;
604
605 return 0;
606
607 err_up:
608 ixgb_free_rx_resources(adapter);
609 err_setup_rx:
610 ixgb_free_tx_resources(adapter);
611 err_setup_tx:
612 ixgb_reset(adapter);
613
614 return err;
615 }
616
617 /**
618 * ixgb_close - Disables a network interface
619 * @netdev: network interface device structure
620 *
621 * Returns 0, this is not allowed to fail
622 *
623 * The close entry point is called when an interface is de-activated
624 * by the OS. The hardware is still under the drivers control, but
625 * needs to be disabled. A global MAC reset is issued to stop the
626 * hardware, and all transmit and receive resources are freed.
627 **/
628
629 static int
630 ixgb_close(struct net_device *netdev)
631 {
632 struct ixgb_adapter *adapter = netdev_priv(netdev);
633
634 ixgb_down(adapter, true);
635
636 ixgb_free_tx_resources(adapter);
637 ixgb_free_rx_resources(adapter);
638
639 return 0;
640 }
641
642 /**
643 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
644 * @adapter: board private structure
645 *
646 * Return 0 on success, negative on failure
647 **/
648
649 int
650 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
651 {
652 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
653 struct pci_dev *pdev = adapter->pdev;
654 int size;
655
656 size = sizeof(struct ixgb_buffer) * txdr->count;
657 txdr->buffer_info = vmalloc(size);
658 if (!txdr->buffer_info) {
659 DPRINTK(PROBE, ERR,
660 "Unable to allocate transmit descriptor ring memory\n");
661 return -ENOMEM;
662 }
663 memset(txdr->buffer_info, 0, size);
664
665 /* round up to nearest 4K */
666
667 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
668 txdr->size = ALIGN(txdr->size, 4096);
669
670 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
671 if (!txdr->desc) {
672 vfree(txdr->buffer_info);
673 DPRINTK(PROBE, ERR,
674 "Unable to allocate transmit descriptor memory\n");
675 return -ENOMEM;
676 }
677 memset(txdr->desc, 0, txdr->size);
678
679 txdr->next_to_use = 0;
680 txdr->next_to_clean = 0;
681
682 return 0;
683 }
684
685 /**
686 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
687 * @adapter: board private structure
688 *
689 * Configure the Tx unit of the MAC after a reset.
690 **/
691
692 static void
693 ixgb_configure_tx(struct ixgb_adapter *adapter)
694 {
695 u64 tdba = adapter->tx_ring.dma;
696 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
697 u32 tctl;
698 struct ixgb_hw *hw = &adapter->hw;
699
700 /* Setup the Base and Length of the Tx Descriptor Ring
701 * tx_ring.dma can be either a 32 or 64 bit value
702 */
703
704 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
705 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
706
707 IXGB_WRITE_REG(hw, TDLEN, tdlen);
708
709 /* Setup the HW Tx Head and Tail descriptor pointers */
710
711 IXGB_WRITE_REG(hw, TDH, 0);
712 IXGB_WRITE_REG(hw, TDT, 0);
713
714 /* don't set up txdctl, it induces performance problems if configured
715 * incorrectly */
716 /* Set the Tx Interrupt Delay register */
717
718 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
719
720 /* Program the Transmit Control Register */
721
722 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
723 IXGB_WRITE_REG(hw, TCTL, tctl);
724
725 /* Setup Transmit Descriptor Settings for this adapter */
726 adapter->tx_cmd_type =
727 IXGB_TX_DESC_TYPE |
728 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
729 }
730
731 /**
732 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
733 * @adapter: board private structure
734 *
735 * Returns 0 on success, negative on failure
736 **/
737
738 int
739 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
740 {
741 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
742 struct pci_dev *pdev = adapter->pdev;
743 int size;
744
745 size = sizeof(struct ixgb_buffer) * rxdr->count;
746 rxdr->buffer_info = vmalloc(size);
747 if (!rxdr->buffer_info) {
748 DPRINTK(PROBE, ERR,
749 "Unable to allocate receive descriptor ring\n");
750 return -ENOMEM;
751 }
752 memset(rxdr->buffer_info, 0, size);
753
754 /* Round up to nearest 4K */
755
756 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
757 rxdr->size = ALIGN(rxdr->size, 4096);
758
759 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
760
761 if (!rxdr->desc) {
762 vfree(rxdr->buffer_info);
763 DPRINTK(PROBE, ERR,
764 "Unable to allocate receive descriptors\n");
765 return -ENOMEM;
766 }
767 memset(rxdr->desc, 0, rxdr->size);
768
769 rxdr->next_to_clean = 0;
770 rxdr->next_to_use = 0;
771
772 return 0;
773 }
774
775 /**
776 * ixgb_setup_rctl - configure the receive control register
777 * @adapter: Board private structure
778 **/
779
780 static void
781 ixgb_setup_rctl(struct ixgb_adapter *adapter)
782 {
783 u32 rctl;
784
785 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
786
787 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
788
789 rctl |=
790 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
791 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
792 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
793
794 rctl |= IXGB_RCTL_SECRC;
795
796 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
797 rctl |= IXGB_RCTL_BSIZE_2048;
798 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
799 rctl |= IXGB_RCTL_BSIZE_4096;
800 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
801 rctl |= IXGB_RCTL_BSIZE_8192;
802 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
803 rctl |= IXGB_RCTL_BSIZE_16384;
804
805 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
806 }
807
808 /**
809 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
810 * @adapter: board private structure
811 *
812 * Configure the Rx unit of the MAC after a reset.
813 **/
814
815 static void
816 ixgb_configure_rx(struct ixgb_adapter *adapter)
817 {
818 u64 rdba = adapter->rx_ring.dma;
819 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
820 struct ixgb_hw *hw = &adapter->hw;
821 u32 rctl;
822 u32 rxcsum;
823
824 /* make sure receives are disabled while setting up the descriptors */
825
826 rctl = IXGB_READ_REG(hw, RCTL);
827 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
828
829 /* set the Receive Delay Timer Register */
830
831 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
832
833 /* Setup the Base and Length of the Rx Descriptor Ring */
834
835 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
836 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
837
838 IXGB_WRITE_REG(hw, RDLEN, rdlen);
839
840 /* Setup the HW Rx Head and Tail Descriptor Pointers */
841 IXGB_WRITE_REG(hw, RDH, 0);
842 IXGB_WRITE_REG(hw, RDT, 0);
843
844 /* due to the hardware errata with RXDCTL, we are unable to use any of
845 * the performance enhancing features of it without causing other
846 * subtle bugs, some of the bugs could include receive length
847 * corruption at high data rates (WTHRESH > 0) and/or receive
848 * descriptor ring irregularites (particularly in hardware cache) */
849 IXGB_WRITE_REG(hw, RXDCTL, 0);
850
851 /* Enable Receive Checksum Offload for TCP and UDP */
852 if (adapter->rx_csum) {
853 rxcsum = IXGB_READ_REG(hw, RXCSUM);
854 rxcsum |= IXGB_RXCSUM_TUOFL;
855 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
856 }
857
858 /* Enable Receives */
859
860 IXGB_WRITE_REG(hw, RCTL, rctl);
861 }
862
863 /**
864 * ixgb_free_tx_resources - Free Tx Resources
865 * @adapter: board private structure
866 *
867 * Free all transmit software resources
868 **/
869
870 void
871 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
872 {
873 struct pci_dev *pdev = adapter->pdev;
874
875 ixgb_clean_tx_ring(adapter);
876
877 vfree(adapter->tx_ring.buffer_info);
878 adapter->tx_ring.buffer_info = NULL;
879
880 pci_free_consistent(pdev, adapter->tx_ring.size,
881 adapter->tx_ring.desc, adapter->tx_ring.dma);
882
883 adapter->tx_ring.desc = NULL;
884 }
885
886 static void
887 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
888 struct ixgb_buffer *buffer_info)
889 {
890 struct pci_dev *pdev = adapter->pdev;
891
892 if (buffer_info->dma)
893 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
894 PCI_DMA_TODEVICE);
895
896 /* okay to call kfree_skb here instead of kfree_skb_any because
897 * this is never called in interrupt context */
898 if (buffer_info->skb)
899 dev_kfree_skb(buffer_info->skb);
900
901 buffer_info->skb = NULL;
902 buffer_info->dma = 0;
903 buffer_info->time_stamp = 0;
904 /* these fields must always be initialized in tx
905 * buffer_info->length = 0;
906 * buffer_info->next_to_watch = 0; */
907 }
908
909 /**
910 * ixgb_clean_tx_ring - Free Tx Buffers
911 * @adapter: board private structure
912 **/
913
914 static void
915 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
916 {
917 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
918 struct ixgb_buffer *buffer_info;
919 unsigned long size;
920 unsigned int i;
921
922 /* Free all the Tx ring sk_buffs */
923
924 for (i = 0; i < tx_ring->count; i++) {
925 buffer_info = &tx_ring->buffer_info[i];
926 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
927 }
928
929 size = sizeof(struct ixgb_buffer) * tx_ring->count;
930 memset(tx_ring->buffer_info, 0, size);
931
932 /* Zero out the descriptor ring */
933
934 memset(tx_ring->desc, 0, tx_ring->size);
935
936 tx_ring->next_to_use = 0;
937 tx_ring->next_to_clean = 0;
938
939 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
940 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
941 }
942
943 /**
944 * ixgb_free_rx_resources - Free Rx Resources
945 * @adapter: board private structure
946 *
947 * Free all receive software resources
948 **/
949
950 void
951 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
952 {
953 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
954 struct pci_dev *pdev = adapter->pdev;
955
956 ixgb_clean_rx_ring(adapter);
957
958 vfree(rx_ring->buffer_info);
959 rx_ring->buffer_info = NULL;
960
961 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
962
963 rx_ring->desc = NULL;
964 }
965
966 /**
967 * ixgb_clean_rx_ring - Free Rx Buffers
968 * @adapter: board private structure
969 **/
970
971 static void
972 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
973 {
974 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
975 struct ixgb_buffer *buffer_info;
976 struct pci_dev *pdev = adapter->pdev;
977 unsigned long size;
978 unsigned int i;
979
980 /* Free all the Rx ring sk_buffs */
981
982 for (i = 0; i < rx_ring->count; i++) {
983 buffer_info = &rx_ring->buffer_info[i];
984 if (buffer_info->dma) {
985 pci_unmap_single(pdev,
986 buffer_info->dma,
987 buffer_info->length,
988 PCI_DMA_FROMDEVICE);
989 buffer_info->dma = 0;
990 buffer_info->length = 0;
991 }
992
993 if (buffer_info->skb) {
994 dev_kfree_skb(buffer_info->skb);
995 buffer_info->skb = NULL;
996 }
997 }
998
999 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1000 memset(rx_ring->buffer_info, 0, size);
1001
1002 /* Zero out the descriptor ring */
1003
1004 memset(rx_ring->desc, 0, rx_ring->size);
1005
1006 rx_ring->next_to_clean = 0;
1007 rx_ring->next_to_use = 0;
1008
1009 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1010 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1011 }
1012
1013 /**
1014 * ixgb_set_mac - Change the Ethernet Address of the NIC
1015 * @netdev: network interface device structure
1016 * @p: pointer to an address structure
1017 *
1018 * Returns 0 on success, negative on failure
1019 **/
1020
1021 static int
1022 ixgb_set_mac(struct net_device *netdev, void *p)
1023 {
1024 struct ixgb_adapter *adapter = netdev_priv(netdev);
1025 struct sockaddr *addr = p;
1026
1027 if (!is_valid_ether_addr(addr->sa_data))
1028 return -EADDRNOTAVAIL;
1029
1030 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1031
1032 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1033
1034 return 0;
1035 }
1036
1037 /**
1038 * ixgb_set_multi - Multicast and Promiscuous mode set
1039 * @netdev: network interface device structure
1040 *
1041 * The set_multi entry point is called whenever the multicast address
1042 * list or the network interface flags are updated. This routine is
1043 * responsible for configuring the hardware for proper multicast,
1044 * promiscuous mode, and all-multi behavior.
1045 **/
1046
1047 static void
1048 ixgb_set_multi(struct net_device *netdev)
1049 {
1050 struct ixgb_adapter *adapter = netdev_priv(netdev);
1051 struct ixgb_hw *hw = &adapter->hw;
1052 struct dev_mc_list *mc_ptr;
1053 u32 rctl;
1054 int i;
1055
1056 /* Check for Promiscuous and All Multicast modes */
1057
1058 rctl = IXGB_READ_REG(hw, RCTL);
1059
1060 if (netdev->flags & IFF_PROMISC) {
1061 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1062 rctl &= ~IXGB_RCTL_VFE;
1063 } else {
1064 if (netdev->flags & IFF_ALLMULTI) {
1065 rctl |= IXGB_RCTL_MPE;
1066 rctl &= ~IXGB_RCTL_UPE;
1067 } else {
1068 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1069 }
1070 rctl |= IXGB_RCTL_VFE;
1071 }
1072
1073 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1074 rctl |= IXGB_RCTL_MPE;
1075 IXGB_WRITE_REG(hw, RCTL, rctl);
1076 } else {
1077 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1078 IXGB_ETH_LENGTH_OF_ADDRESS];
1079
1080 IXGB_WRITE_REG(hw, RCTL, rctl);
1081
1082 for (i = 0, mc_ptr = netdev->mc_list;
1083 mc_ptr;
1084 i++, mc_ptr = mc_ptr->next)
1085 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1086 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1087
1088 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1089 }
1090 }
1091
1092 /**
1093 * ixgb_watchdog - Timer Call-back
1094 * @data: pointer to netdev cast into an unsigned long
1095 **/
1096
1097 static void
1098 ixgb_watchdog(unsigned long data)
1099 {
1100 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1101 struct net_device *netdev = adapter->netdev;
1102 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1103
1104 ixgb_check_for_link(&adapter->hw);
1105
1106 if (ixgb_check_for_bad_link(&adapter->hw)) {
1107 /* force the reset path */
1108 netif_stop_queue(netdev);
1109 }
1110
1111 if (adapter->hw.link_up) {
1112 if (!netif_carrier_ok(netdev)) {
1113 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1114 "Full Duplex, Flow Control: %s\n",
1115 netdev->name,
1116 (adapter->hw.fc.type == ixgb_fc_full) ?
1117 "RX/TX" :
1118 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1119 "RX" :
1120 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1121 "TX" : "None")));
1122 adapter->link_speed = 10000;
1123 adapter->link_duplex = FULL_DUPLEX;
1124 netif_carrier_on(netdev);
1125 netif_wake_queue(netdev);
1126 }
1127 } else {
1128 if (netif_carrier_ok(netdev)) {
1129 adapter->link_speed = 0;
1130 adapter->link_duplex = 0;
1131 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1132 netdev->name);
1133 netif_carrier_off(netdev);
1134 netif_stop_queue(netdev);
1135
1136 }
1137 }
1138
1139 ixgb_update_stats(adapter);
1140
1141 if (!netif_carrier_ok(netdev)) {
1142 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1143 /* We've lost link, so the controller stops DMA,
1144 * but we've got queued Tx work that's never going
1145 * to get done, so reset controller to flush Tx.
1146 * (Do the reset outside of interrupt context). */
1147 schedule_work(&adapter->tx_timeout_task);
1148 }
1149 }
1150
1151 /* Force detection of hung controller every watchdog period */
1152 adapter->detect_tx_hung = true;
1153
1154 /* generate an interrupt to force clean up of any stragglers */
1155 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1156
1157 /* Reset the timer */
1158 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1159 }
1160
1161 #define IXGB_TX_FLAGS_CSUM 0x00000001
1162 #define IXGB_TX_FLAGS_VLAN 0x00000002
1163 #define IXGB_TX_FLAGS_TSO 0x00000004
1164
1165 static int
1166 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1167 {
1168 struct ixgb_context_desc *context_desc;
1169 unsigned int i;
1170 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1171 u16 ipcse, tucse, mss;
1172 int err;
1173
1174 if (likely(skb_is_gso(skb))) {
1175 struct ixgb_buffer *buffer_info;
1176 struct iphdr *iph;
1177
1178 if (skb_header_cloned(skb)) {
1179 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1180 if (err)
1181 return err;
1182 }
1183
1184 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1185 mss = skb_shinfo(skb)->gso_size;
1186 iph = ip_hdr(skb);
1187 iph->tot_len = 0;
1188 iph->check = 0;
1189 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1190 iph->daddr, 0,
1191 IPPROTO_TCP, 0);
1192 ipcss = skb_network_offset(skb);
1193 ipcso = (void *)&(iph->check) - (void *)skb->data;
1194 ipcse = skb_transport_offset(skb) - 1;
1195 tucss = skb_transport_offset(skb);
1196 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1197 tucse = 0;
1198
1199 i = adapter->tx_ring.next_to_use;
1200 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1201 buffer_info = &adapter->tx_ring.buffer_info[i];
1202 WARN_ON(buffer_info->dma != 0);
1203
1204 context_desc->ipcss = ipcss;
1205 context_desc->ipcso = ipcso;
1206 context_desc->ipcse = cpu_to_le16(ipcse);
1207 context_desc->tucss = tucss;
1208 context_desc->tucso = tucso;
1209 context_desc->tucse = cpu_to_le16(tucse);
1210 context_desc->mss = cpu_to_le16(mss);
1211 context_desc->hdr_len = hdr_len;
1212 context_desc->status = 0;
1213 context_desc->cmd_type_len = cpu_to_le32(
1214 IXGB_CONTEXT_DESC_TYPE
1215 | IXGB_CONTEXT_DESC_CMD_TSE
1216 | IXGB_CONTEXT_DESC_CMD_IP
1217 | IXGB_CONTEXT_DESC_CMD_TCP
1218 | IXGB_CONTEXT_DESC_CMD_IDE
1219 | (skb->len - (hdr_len)));
1220
1221
1222 if (++i == adapter->tx_ring.count) i = 0;
1223 adapter->tx_ring.next_to_use = i;
1224
1225 return 1;
1226 }
1227
1228 return 0;
1229 }
1230
1231 static bool
1232 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1233 {
1234 struct ixgb_context_desc *context_desc;
1235 unsigned int i;
1236 u8 css, cso;
1237
1238 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1239 struct ixgb_buffer *buffer_info;
1240 css = skb_transport_offset(skb);
1241 cso = css + skb->csum_offset;
1242
1243 i = adapter->tx_ring.next_to_use;
1244 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1245 buffer_info = &adapter->tx_ring.buffer_info[i];
1246 WARN_ON(buffer_info->dma != 0);
1247
1248 context_desc->tucss = css;
1249 context_desc->tucso = cso;
1250 context_desc->tucse = 0;
1251 /* zero out any previously existing data in one instruction */
1252 *(u32 *)&(context_desc->ipcss) = 0;
1253 context_desc->status = 0;
1254 context_desc->hdr_len = 0;
1255 context_desc->mss = 0;
1256 context_desc->cmd_type_len =
1257 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1258 | IXGB_TX_DESC_CMD_IDE);
1259
1260 if (++i == adapter->tx_ring.count) i = 0;
1261 adapter->tx_ring.next_to_use = i;
1262
1263 return true;
1264 }
1265
1266 return false;
1267 }
1268
1269 #define IXGB_MAX_TXD_PWR 14
1270 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1271
1272 static int
1273 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1274 unsigned int first)
1275 {
1276 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1277 struct ixgb_buffer *buffer_info;
1278 int len = skb->len;
1279 unsigned int offset = 0, size, count = 0, i;
1280 unsigned int mss = skb_shinfo(skb)->gso_size;
1281
1282 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1283 unsigned int f;
1284
1285 len -= skb->data_len;
1286
1287 i = tx_ring->next_to_use;
1288
1289 while (len) {
1290 buffer_info = &tx_ring->buffer_info[i];
1291 size = min(len, IXGB_MAX_DATA_PER_TXD);
1292 /* Workaround for premature desc write-backs
1293 * in TSO mode. Append 4-byte sentinel desc */
1294 if (unlikely(mss && !nr_frags && size == len && size > 8))
1295 size -= 4;
1296
1297 buffer_info->length = size;
1298 WARN_ON(buffer_info->dma != 0);
1299 buffer_info->time_stamp = jiffies;
1300 buffer_info->dma =
1301 pci_map_single(adapter->pdev,
1302 skb->data + offset,
1303 size,
1304 PCI_DMA_TODEVICE);
1305 buffer_info->next_to_watch = 0;
1306
1307 len -= size;
1308 offset += size;
1309 count++;
1310 if (++i == tx_ring->count) i = 0;
1311 }
1312
1313 for (f = 0; f < nr_frags; f++) {
1314 struct skb_frag_struct *frag;
1315
1316 frag = &skb_shinfo(skb)->frags[f];
1317 len = frag->size;
1318 offset = 0;
1319
1320 while (len) {
1321 buffer_info = &tx_ring->buffer_info[i];
1322 size = min(len, IXGB_MAX_DATA_PER_TXD);
1323
1324 /* Workaround for premature desc write-backs
1325 * in TSO mode. Append 4-byte sentinel desc */
1326 if (unlikely(mss && (f == (nr_frags - 1))
1327 && size == len && size > 8))
1328 size -= 4;
1329
1330 buffer_info->length = size;
1331 buffer_info->time_stamp = jiffies;
1332 buffer_info->dma =
1333 pci_map_page(adapter->pdev,
1334 frag->page,
1335 frag->page_offset + offset,
1336 size,
1337 PCI_DMA_TODEVICE);
1338 buffer_info->next_to_watch = 0;
1339
1340 len -= size;
1341 offset += size;
1342 count++;
1343 if (++i == tx_ring->count) i = 0;
1344 }
1345 }
1346 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1347 tx_ring->buffer_info[i].skb = skb;
1348 tx_ring->buffer_info[first].next_to_watch = i;
1349
1350 return count;
1351 }
1352
1353 static void
1354 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1355 {
1356 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1357 struct ixgb_tx_desc *tx_desc = NULL;
1358 struct ixgb_buffer *buffer_info;
1359 u32 cmd_type_len = adapter->tx_cmd_type;
1360 u8 status = 0;
1361 u8 popts = 0;
1362 unsigned int i;
1363
1364 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1365 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1366 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1367 }
1368
1369 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1370 popts |= IXGB_TX_DESC_POPTS_TXSM;
1371
1372 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1373 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1374
1375 i = tx_ring->next_to_use;
1376
1377 while (count--) {
1378 buffer_info = &tx_ring->buffer_info[i];
1379 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1380 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1381 tx_desc->cmd_type_len =
1382 cpu_to_le32(cmd_type_len | buffer_info->length);
1383 tx_desc->status = status;
1384 tx_desc->popts = popts;
1385 tx_desc->vlan = cpu_to_le16(vlan_id);
1386
1387 if (++i == tx_ring->count) i = 0;
1388 }
1389
1390 tx_desc->cmd_type_len |=
1391 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1392
1393 /* Force memory writes to complete before letting h/w
1394 * know there are new descriptors to fetch. (Only
1395 * applicable for weak-ordered memory model archs,
1396 * such as IA-64). */
1397 wmb();
1398
1399 tx_ring->next_to_use = i;
1400 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1401 }
1402
1403 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1404 {
1405 struct ixgb_adapter *adapter = netdev_priv(netdev);
1406 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1407
1408 netif_stop_queue(netdev);
1409 /* Herbert's original patch had:
1410 * smp_mb__after_netif_stop_queue();
1411 * but since that doesn't exist yet, just open code it. */
1412 smp_mb();
1413
1414 /* We need to check again in a case another CPU has just
1415 * made room available. */
1416 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1417 return -EBUSY;
1418
1419 /* A reprieve! */
1420 netif_start_queue(netdev);
1421 ++adapter->restart_queue;
1422 return 0;
1423 }
1424
1425 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1426 struct ixgb_desc_ring *tx_ring, int size)
1427 {
1428 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1429 return 0;
1430 return __ixgb_maybe_stop_tx(netdev, size);
1431 }
1432
1433
1434 /* Tx Descriptors needed, worst case */
1435 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1436 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1437 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1438 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1439 + 1 /* one more needed for sentinel TSO workaround */
1440
1441 static int
1442 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1443 {
1444 struct ixgb_adapter *adapter = netdev_priv(netdev);
1445 unsigned int first;
1446 unsigned int tx_flags = 0;
1447 int vlan_id = 0;
1448 int tso;
1449
1450 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1451 dev_kfree_skb(skb);
1452 return NETDEV_TX_OK;
1453 }
1454
1455 if (skb->len <= 0) {
1456 dev_kfree_skb(skb);
1457 return 0;
1458 }
1459
1460 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1461 DESC_NEEDED)))
1462 return NETDEV_TX_BUSY;
1463
1464 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1465 tx_flags |= IXGB_TX_FLAGS_VLAN;
1466 vlan_id = vlan_tx_tag_get(skb);
1467 }
1468
1469 first = adapter->tx_ring.next_to_use;
1470
1471 tso = ixgb_tso(adapter, skb);
1472 if (tso < 0) {
1473 dev_kfree_skb(skb);
1474 return NETDEV_TX_OK;
1475 }
1476
1477 if (likely(tso))
1478 tx_flags |= IXGB_TX_FLAGS_TSO;
1479 else if (ixgb_tx_csum(adapter, skb))
1480 tx_flags |= IXGB_TX_FLAGS_CSUM;
1481
1482 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1483 tx_flags);
1484
1485 netdev->trans_start = jiffies;
1486
1487 /* Make sure there is space in the ring for the next send. */
1488 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1489
1490 return NETDEV_TX_OK;
1491 }
1492
1493 /**
1494 * ixgb_tx_timeout - Respond to a Tx Hang
1495 * @netdev: network interface device structure
1496 **/
1497
1498 static void
1499 ixgb_tx_timeout(struct net_device *netdev)
1500 {
1501 struct ixgb_adapter *adapter = netdev_priv(netdev);
1502
1503 /* Do the reset outside of interrupt context */
1504 schedule_work(&adapter->tx_timeout_task);
1505 }
1506
1507 static void
1508 ixgb_tx_timeout_task(struct work_struct *work)
1509 {
1510 struct ixgb_adapter *adapter =
1511 container_of(work, struct ixgb_adapter, tx_timeout_task);
1512
1513 adapter->tx_timeout_count++;
1514 ixgb_down(adapter, true);
1515 ixgb_up(adapter);
1516 }
1517
1518 /**
1519 * ixgb_get_stats - Get System Network Statistics
1520 * @netdev: network interface device structure
1521 *
1522 * Returns the address of the device statistics structure.
1523 * The statistics are actually updated from the timer callback.
1524 **/
1525
1526 static struct net_device_stats *
1527 ixgb_get_stats(struct net_device *netdev)
1528 {
1529 struct ixgb_adapter *adapter = netdev_priv(netdev);
1530
1531 return &adapter->net_stats;
1532 }
1533
1534 /**
1535 * ixgb_change_mtu - Change the Maximum Transfer Unit
1536 * @netdev: network interface device structure
1537 * @new_mtu: new value for maximum frame size
1538 *
1539 * Returns 0 on success, negative on failure
1540 **/
1541
1542 static int
1543 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1544 {
1545 struct ixgb_adapter *adapter = netdev_priv(netdev);
1546 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1547 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1548
1549 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1550 if ((new_mtu < 68) ||
1551 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1552 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1553 return -EINVAL;
1554 }
1555
1556 if (old_max_frame == max_frame)
1557 return 0;
1558
1559 if (netif_running(netdev))
1560 ixgb_down(adapter, true);
1561
1562 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1563
1564 netdev->mtu = new_mtu;
1565
1566 if (netif_running(netdev))
1567 ixgb_up(adapter);
1568
1569 return 0;
1570 }
1571
1572 /**
1573 * ixgb_update_stats - Update the board statistics counters.
1574 * @adapter: board private structure
1575 **/
1576
1577 void
1578 ixgb_update_stats(struct ixgb_adapter *adapter)
1579 {
1580 struct net_device *netdev = adapter->netdev;
1581 struct pci_dev *pdev = adapter->pdev;
1582
1583 /* Prevent stats update while adapter is being reset */
1584 if (pci_channel_offline(pdev))
1585 return;
1586
1587 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1588 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1589 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1590 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1591 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1592 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1593
1594 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1595 /* fix up multicast stats by removing broadcasts */
1596 if (multi >= bcast)
1597 multi -= bcast;
1598
1599 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1600 adapter->stats.mprch += (multi >> 32);
1601 adapter->stats.bprcl += bcast_l;
1602 adapter->stats.bprch += bcast_h;
1603 } else {
1604 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1605 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1606 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1607 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1608 }
1609 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1610 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1611 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1612 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1613 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1614 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1615 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1616 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1617 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1618 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1619 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1620 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1621 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1622 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1623 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1624 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1625 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1626 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1627 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1628 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1629 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1630 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1631 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1632 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1633 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1634 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1635 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1636 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1637 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1638 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1639 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1640 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1641 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1642 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1643 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1644 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1645 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1646 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1647 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1648 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1649 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1650 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1651 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1652 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1653 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1654 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1655 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1656 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1657 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1658 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1659 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1660 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1661 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1662 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1663 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1664 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1665
1666 /* Fill out the OS statistics structure */
1667
1668 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1669 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1670 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1671 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1672 adapter->net_stats.multicast = adapter->stats.mprcl;
1673 adapter->net_stats.collisions = 0;
1674
1675 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1676 * with a length in the type/len field */
1677 adapter->net_stats.rx_errors =
1678 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1679 adapter->stats.ruc +
1680 adapter->stats.roc /*+ adapter->stats.rlec */ +
1681 adapter->stats.icbc +
1682 adapter->stats.ecbc + adapter->stats.mpc;
1683
1684 /* see above
1685 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1686 */
1687
1688 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1689 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1690 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1691 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1692
1693 adapter->net_stats.tx_errors = 0;
1694 adapter->net_stats.rx_frame_errors = 0;
1695 adapter->net_stats.tx_aborted_errors = 0;
1696 adapter->net_stats.tx_carrier_errors = 0;
1697 adapter->net_stats.tx_fifo_errors = 0;
1698 adapter->net_stats.tx_heartbeat_errors = 0;
1699 adapter->net_stats.tx_window_errors = 0;
1700 }
1701
1702 #define IXGB_MAX_INTR 10
1703 /**
1704 * ixgb_intr - Interrupt Handler
1705 * @irq: interrupt number
1706 * @data: pointer to a network interface device structure
1707 **/
1708
1709 static irqreturn_t
1710 ixgb_intr(int irq, void *data)
1711 {
1712 struct net_device *netdev = data;
1713 struct ixgb_adapter *adapter = netdev_priv(netdev);
1714 struct ixgb_hw *hw = &adapter->hw;
1715 u32 icr = IXGB_READ_REG(hw, ICR);
1716
1717 if (unlikely(!icr))
1718 return IRQ_NONE; /* Not our interrupt */
1719
1720 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1721 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1722 mod_timer(&adapter->watchdog_timer, jiffies);
1723
1724 if (netif_rx_schedule_prep(&adapter->napi)) {
1725
1726 /* Disable interrupts and register for poll. The flush
1727 of the posted write is intentionally left out.
1728 */
1729
1730 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1731 __netif_rx_schedule(&adapter->napi);
1732 }
1733 return IRQ_HANDLED;
1734 }
1735
1736 /**
1737 * ixgb_clean - NAPI Rx polling callback
1738 * @adapter: board private structure
1739 **/
1740
1741 static int
1742 ixgb_clean(struct napi_struct *napi, int budget)
1743 {
1744 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1745 int work_done = 0;
1746
1747 ixgb_clean_tx_irq(adapter);
1748 ixgb_clean_rx_irq(adapter, &work_done, budget);
1749
1750 /* If budget not fully consumed, exit the polling mode */
1751 if (work_done < budget) {
1752 netif_rx_complete(napi);
1753 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1754 ixgb_irq_enable(adapter);
1755 }
1756
1757 return work_done;
1758 }
1759
1760 /**
1761 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1762 * @adapter: board private structure
1763 **/
1764
1765 static bool
1766 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1767 {
1768 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1769 struct net_device *netdev = adapter->netdev;
1770 struct ixgb_tx_desc *tx_desc, *eop_desc;
1771 struct ixgb_buffer *buffer_info;
1772 unsigned int i, eop;
1773 bool cleaned = false;
1774
1775 i = tx_ring->next_to_clean;
1776 eop = tx_ring->buffer_info[i].next_to_watch;
1777 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1778
1779 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1780
1781 for (cleaned = false; !cleaned; ) {
1782 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1783 buffer_info = &tx_ring->buffer_info[i];
1784
1785 if (tx_desc->popts &
1786 (IXGB_TX_DESC_POPTS_TXSM |
1787 IXGB_TX_DESC_POPTS_IXSM))
1788 adapter->hw_csum_tx_good++;
1789
1790 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1791
1792 *(u32 *)&(tx_desc->status) = 0;
1793
1794 cleaned = (i == eop);
1795 if (++i == tx_ring->count) i = 0;
1796 }
1797
1798 eop = tx_ring->buffer_info[i].next_to_watch;
1799 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1800 }
1801
1802 tx_ring->next_to_clean = i;
1803
1804 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1805 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1806 /* Make sure that anybody stopping the queue after this
1807 * sees the new next_to_clean. */
1808 smp_mb();
1809
1810 if (netif_queue_stopped(netdev) &&
1811 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1812 netif_wake_queue(netdev);
1813 ++adapter->restart_queue;
1814 }
1815 }
1816
1817 if (adapter->detect_tx_hung) {
1818 /* detect a transmit hang in hardware, this serializes the
1819 * check with the clearing of time_stamp and movement of i */
1820 adapter->detect_tx_hung = false;
1821 if (tx_ring->buffer_info[eop].dma &&
1822 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1823 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1824 IXGB_STATUS_TXOFF)) {
1825 /* detected Tx unit hang */
1826 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1827 " TDH <%x>\n"
1828 " TDT <%x>\n"
1829 " next_to_use <%x>\n"
1830 " next_to_clean <%x>\n"
1831 "buffer_info[next_to_clean]\n"
1832 " time_stamp <%lx>\n"
1833 " next_to_watch <%x>\n"
1834 " jiffies <%lx>\n"
1835 " next_to_watch.status <%x>\n",
1836 IXGB_READ_REG(&adapter->hw, TDH),
1837 IXGB_READ_REG(&adapter->hw, TDT),
1838 tx_ring->next_to_use,
1839 tx_ring->next_to_clean,
1840 tx_ring->buffer_info[eop].time_stamp,
1841 eop,
1842 jiffies,
1843 eop_desc->status);
1844 netif_stop_queue(netdev);
1845 }
1846 }
1847
1848 return cleaned;
1849 }
1850
1851 /**
1852 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1853 * @adapter: board private structure
1854 * @rx_desc: receive descriptor
1855 * @sk_buff: socket buffer with received data
1856 **/
1857
1858 static void
1859 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1860 struct ixgb_rx_desc *rx_desc,
1861 struct sk_buff *skb)
1862 {
1863 /* Ignore Checksum bit is set OR
1864 * TCP Checksum has not been calculated
1865 */
1866 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1867 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1868 skb->ip_summed = CHECKSUM_NONE;
1869 return;
1870 }
1871
1872 /* At this point we know the hardware did the TCP checksum */
1873 /* now look at the TCP checksum error bit */
1874 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1875 /* let the stack verify checksum errors */
1876 skb->ip_summed = CHECKSUM_NONE;
1877 adapter->hw_csum_rx_error++;
1878 } else {
1879 /* TCP checksum is good */
1880 skb->ip_summed = CHECKSUM_UNNECESSARY;
1881 adapter->hw_csum_rx_good++;
1882 }
1883 }
1884
1885 /**
1886 * ixgb_clean_rx_irq - Send received data up the network stack,
1887 * @adapter: board private structure
1888 **/
1889
1890 static bool
1891 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1892 {
1893 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1894 struct net_device *netdev = adapter->netdev;
1895 struct pci_dev *pdev = adapter->pdev;
1896 struct ixgb_rx_desc *rx_desc, *next_rxd;
1897 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1898 u32 length;
1899 unsigned int i, j;
1900 int cleaned_count = 0;
1901 bool cleaned = false;
1902
1903 i = rx_ring->next_to_clean;
1904 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1905 buffer_info = &rx_ring->buffer_info[i];
1906
1907 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1908 struct sk_buff *skb;
1909 u8 status;
1910
1911 if (*work_done >= work_to_do)
1912 break;
1913
1914 (*work_done)++;
1915 status = rx_desc->status;
1916 skb = buffer_info->skb;
1917 buffer_info->skb = NULL;
1918
1919 prefetch(skb->data - NET_IP_ALIGN);
1920
1921 if (++i == rx_ring->count) i = 0;
1922 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1923 prefetch(next_rxd);
1924
1925 if ((j = i + 1) == rx_ring->count) j = 0;
1926 next2_buffer = &rx_ring->buffer_info[j];
1927 prefetch(next2_buffer);
1928
1929 next_buffer = &rx_ring->buffer_info[i];
1930
1931 cleaned = true;
1932 cleaned_count++;
1933
1934 pci_unmap_single(pdev,
1935 buffer_info->dma,
1936 buffer_info->length,
1937 PCI_DMA_FROMDEVICE);
1938 buffer_info->dma = 0;
1939
1940 length = le16_to_cpu(rx_desc->length);
1941 rx_desc->length = 0;
1942
1943 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1944
1945 /* All receives must fit into a single buffer */
1946
1947 IXGB_DBG("Receive packet consumed multiple buffers "
1948 "length<%x>\n", length);
1949
1950 dev_kfree_skb_irq(skb);
1951 goto rxdesc_done;
1952 }
1953
1954 if (unlikely(rx_desc->errors &
1955 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1956 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1957 dev_kfree_skb_irq(skb);
1958 goto rxdesc_done;
1959 }
1960
1961 /* code added for copybreak, this should improve
1962 * performance for small packets with large amounts
1963 * of reassembly being done in the stack */
1964 if (length < copybreak) {
1965 struct sk_buff *new_skb =
1966 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1967 if (new_skb) {
1968 skb_reserve(new_skb, NET_IP_ALIGN);
1969 skb_copy_to_linear_data_offset(new_skb,
1970 -NET_IP_ALIGN,
1971 (skb->data -
1972 NET_IP_ALIGN),
1973 (length +
1974 NET_IP_ALIGN));
1975 /* save the skb in buffer_info as good */
1976 buffer_info->skb = skb;
1977 skb = new_skb;
1978 }
1979 }
1980 /* end copybreak code */
1981
1982 /* Good Receive */
1983 skb_put(skb, length);
1984
1985 /* Receive Checksum Offload */
1986 ixgb_rx_checksum(adapter, rx_desc, skb);
1987
1988 skb->protocol = eth_type_trans(skb, netdev);
1989 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1990 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1991 le16_to_cpu(rx_desc->special));
1992 } else {
1993 netif_receive_skb(skb);
1994 }
1995
1996 rxdesc_done:
1997 /* clean up descriptor, might be written over by hw */
1998 rx_desc->status = 0;
1999
2000 /* return some buffers to hardware, one at a time is too slow */
2001 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2002 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2003 cleaned_count = 0;
2004 }
2005
2006 /* use prefetched values */
2007 rx_desc = next_rxd;
2008 buffer_info = next_buffer;
2009 }
2010
2011 rx_ring->next_to_clean = i;
2012
2013 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2014 if (cleaned_count)
2015 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2016
2017 return cleaned;
2018 }
2019
2020 /**
2021 * ixgb_alloc_rx_buffers - Replace used receive buffers
2022 * @adapter: address of board private structure
2023 **/
2024
2025 static void
2026 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2027 {
2028 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2029 struct net_device *netdev = adapter->netdev;
2030 struct pci_dev *pdev = adapter->pdev;
2031 struct ixgb_rx_desc *rx_desc;
2032 struct ixgb_buffer *buffer_info;
2033 struct sk_buff *skb;
2034 unsigned int i;
2035 long cleancount;
2036
2037 i = rx_ring->next_to_use;
2038 buffer_info = &rx_ring->buffer_info[i];
2039 cleancount = IXGB_DESC_UNUSED(rx_ring);
2040
2041
2042 /* leave three descriptors unused */
2043 while (--cleancount > 2 && cleaned_count--) {
2044 /* recycle! its good for you */
2045 skb = buffer_info->skb;
2046 if (skb) {
2047 skb_trim(skb, 0);
2048 goto map_skb;
2049 }
2050
2051 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2052 + NET_IP_ALIGN);
2053 if (unlikely(!skb)) {
2054 /* Better luck next round */
2055 adapter->alloc_rx_buff_failed++;
2056 break;
2057 }
2058
2059 /* Make buffer alignment 2 beyond a 16 byte boundary
2060 * this will result in a 16 byte aligned IP header after
2061 * the 14 byte MAC header is removed
2062 */
2063 skb_reserve(skb, NET_IP_ALIGN);
2064
2065 buffer_info->skb = skb;
2066 buffer_info->length = adapter->rx_buffer_len;
2067 map_skb:
2068 buffer_info->dma = pci_map_single(pdev,
2069 skb->data,
2070 adapter->rx_buffer_len,
2071 PCI_DMA_FROMDEVICE);
2072
2073 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2074 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2075 /* guarantee DD bit not set now before h/w gets descriptor
2076 * this is the rest of the workaround for h/w double
2077 * writeback. */
2078 rx_desc->status = 0;
2079
2080
2081 if (++i == rx_ring->count) i = 0;
2082 buffer_info = &rx_ring->buffer_info[i];
2083 }
2084
2085 if (likely(rx_ring->next_to_use != i)) {
2086 rx_ring->next_to_use = i;
2087 if (unlikely(i-- == 0))
2088 i = (rx_ring->count - 1);
2089
2090 /* Force memory writes to complete before letting h/w
2091 * know there are new descriptors to fetch. (Only
2092 * applicable for weak-ordered memory model archs, such
2093 * as IA-64). */
2094 wmb();
2095 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2096 }
2097 }
2098
2099 /**
2100 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2101 *
2102 * @param netdev network interface device structure
2103 * @param grp indicates to enable or disable tagging/stripping
2104 **/
2105 static void
2106 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2107 {
2108 struct ixgb_adapter *adapter = netdev_priv(netdev);
2109 u32 ctrl, rctl;
2110
2111 ixgb_irq_disable(adapter);
2112 adapter->vlgrp = grp;
2113
2114 if (grp) {
2115 /* enable VLAN tag insert/strip */
2116 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2117 ctrl |= IXGB_CTRL0_VME;
2118 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2119
2120 /* enable VLAN receive filtering */
2121
2122 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2123 rctl &= ~IXGB_RCTL_CFIEN;
2124 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2125 } else {
2126 /* disable VLAN tag insert/strip */
2127
2128 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2129 ctrl &= ~IXGB_CTRL0_VME;
2130 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2131 }
2132
2133 /* don't enable interrupts unless we are UP */
2134 if (adapter->netdev->flags & IFF_UP)
2135 ixgb_irq_enable(adapter);
2136 }
2137
2138 static void
2139 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2140 {
2141 struct ixgb_adapter *adapter = netdev_priv(netdev);
2142 u32 vfta, index;
2143
2144 /* add VID to filter table */
2145
2146 index = (vid >> 5) & 0x7F;
2147 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2148 vfta |= (1 << (vid & 0x1F));
2149 ixgb_write_vfta(&adapter->hw, index, vfta);
2150 }
2151
2152 static void
2153 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2154 {
2155 struct ixgb_adapter *adapter = netdev_priv(netdev);
2156 u32 vfta, index;
2157
2158 ixgb_irq_disable(adapter);
2159
2160 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2161
2162 /* don't enable interrupts unless we are UP */
2163 if (adapter->netdev->flags & IFF_UP)
2164 ixgb_irq_enable(adapter);
2165
2166 /* remove VID from filter table */
2167
2168 index = (vid >> 5) & 0x7F;
2169 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2170 vfta &= ~(1 << (vid & 0x1F));
2171 ixgb_write_vfta(&adapter->hw, index, vfta);
2172 }
2173
2174 static void
2175 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2176 {
2177 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2178
2179 if (adapter->vlgrp) {
2180 u16 vid;
2181 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2182 if (!vlan_group_get_device(adapter->vlgrp, vid))
2183 continue;
2184 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2185 }
2186 }
2187 }
2188
2189 #ifdef CONFIG_NET_POLL_CONTROLLER
2190 /*
2191 * Polling 'interrupt' - used by things like netconsole to send skbs
2192 * without having to re-enable interrupts. It's not called while
2193 * the interrupt routine is executing.
2194 */
2195
2196 static void ixgb_netpoll(struct net_device *dev)
2197 {
2198 struct ixgb_adapter *adapter = netdev_priv(dev);
2199
2200 disable_irq(adapter->pdev->irq);
2201 ixgb_intr(adapter->pdev->irq, dev);
2202 enable_irq(adapter->pdev->irq);
2203 }
2204 #endif
2205
2206 /**
2207 * ixgb_io_error_detected() - called when PCI error is detected
2208 * @pdev pointer to pci device with error
2209 * @state pci channel state after error
2210 *
2211 * This callback is called by the PCI subsystem whenever
2212 * a PCI bus error is detected.
2213 */
2214 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2215 enum pci_channel_state state)
2216 {
2217 struct net_device *netdev = pci_get_drvdata(pdev);
2218 struct ixgb_adapter *adapter = netdev_priv(netdev);
2219
2220 if (netif_running(netdev))
2221 ixgb_down(adapter, true);
2222
2223 pci_disable_device(pdev);
2224
2225 /* Request a slot reset. */
2226 return PCI_ERS_RESULT_NEED_RESET;
2227 }
2228
2229 /**
2230 * ixgb_io_slot_reset - called after the pci bus has been reset.
2231 * @pdev pointer to pci device with error
2232 *
2233 * This callback is called after the PCI bus has been reset.
2234 * Basically, this tries to restart the card from scratch.
2235 * This is a shortened version of the device probe/discovery code,
2236 * it resembles the first-half of the ixgb_probe() routine.
2237 */
2238 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2239 {
2240 struct net_device *netdev = pci_get_drvdata(pdev);
2241 struct ixgb_adapter *adapter = netdev_priv(netdev);
2242
2243 if (pci_enable_device(pdev)) {
2244 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2245 return PCI_ERS_RESULT_DISCONNECT;
2246 }
2247
2248 /* Perform card reset only on one instance of the card */
2249 if (0 != PCI_FUNC (pdev->devfn))
2250 return PCI_ERS_RESULT_RECOVERED;
2251
2252 pci_set_master(pdev);
2253
2254 netif_carrier_off(netdev);
2255 netif_stop_queue(netdev);
2256 ixgb_reset(adapter);
2257
2258 /* Make sure the EEPROM is good */
2259 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2260 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2261 return PCI_ERS_RESULT_DISCONNECT;
2262 }
2263 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2264 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2265
2266 if (!is_valid_ether_addr(netdev->perm_addr)) {
2267 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2268 return PCI_ERS_RESULT_DISCONNECT;
2269 }
2270
2271 return PCI_ERS_RESULT_RECOVERED;
2272 }
2273
2274 /**
2275 * ixgb_io_resume - called when its OK to resume normal operations
2276 * @pdev pointer to pci device with error
2277 *
2278 * The error recovery driver tells us that its OK to resume
2279 * normal operation. Implementation resembles the second-half
2280 * of the ixgb_probe() routine.
2281 */
2282 static void ixgb_io_resume(struct pci_dev *pdev)
2283 {
2284 struct net_device *netdev = pci_get_drvdata(pdev);
2285 struct ixgb_adapter *adapter = netdev_priv(netdev);
2286
2287 pci_set_master(pdev);
2288
2289 if (netif_running(netdev)) {
2290 if (ixgb_up(adapter)) {
2291 printk ("ixgb: can't bring device back up after reset\n");
2292 return;
2293 }
2294 }
2295
2296 netif_device_attach(netdev);
2297 mod_timer(&adapter->watchdog_timer, jiffies);
2298 }
2299
2300 /* ixgb_main.c */
(Inofficial) Linux kernel tree running on the Nao robot