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ixgb: add copybreak parameter
[linux-2.6/verdex.git] / drivers / net / ixgb / ixgb_main.c
blob4e422c4cbe8387605ce342737037b61da3e8b218
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2006 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 #ifndef CONFIG_IXGB_NAPI
35 #define DRIVERNAPI
36 #else
37 #define DRIVERNAPI "-NAPI"
38 #endif
39 #define DRV_VERSION "1.0.126-k4"DRIVERNAPI
40 const char ixgb_driver_version[] = DRV_VERSION;
41 static const char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
42
43 #define IXGB_CB_LENGTH 256
44 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
45 module_param(copybreak, uint, 0644);
46 MODULE_PARM_DESC(copybreak,
47 "Maximum size of packet that is copied to a new buffer on receive");
48
49 /* ixgb_pci_tbl - PCI Device ID Table
50 *
51 * Wildcard entries (PCI_ANY_ID) should come last
52 * Last entry must be all 0s
53 *
54 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
55 * Class, Class Mask, private data (not used) }
56 */
57 static struct pci_device_id ixgb_pci_tbl[] = {
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
63 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
65 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
66
67 /* required last entry */
68 {0,}
69 };
70
71 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
72
73 /* Local Function Prototypes */
74
75 int ixgb_up(struct ixgb_adapter *adapter);
76 void ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog);
77 void ixgb_reset(struct ixgb_adapter *adapter);
78 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
79 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
80 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
81 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
82 void ixgb_update_stats(struct ixgb_adapter *adapter);
83
84 static int ixgb_init_module(void);
85 static void ixgb_exit_module(void);
86 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
87 static void __devexit ixgb_remove(struct pci_dev *pdev);
88 static int ixgb_sw_init(struct ixgb_adapter *adapter);
89 static int ixgb_open(struct net_device *netdev);
90 static int ixgb_close(struct net_device *netdev);
91 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
92 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
93 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
94 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
95 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
96 static void ixgb_set_multi(struct net_device *netdev);
97 static void ixgb_watchdog(unsigned long data);
98 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
99 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
100 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
101 static int ixgb_set_mac(struct net_device *netdev, void *p);
102 static irqreturn_t ixgb_intr(int irq, void *data);
103 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
104
105 #ifdef CONFIG_IXGB_NAPI
106 static int ixgb_clean(struct napi_struct *napi, int budget);
107 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
108 int *work_done, int work_to_do);
109 #else
110 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
111 #endif
112 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
113 static void ixgb_tx_timeout(struct net_device *dev);
114 static void ixgb_tx_timeout_task(struct work_struct *work);
115 static void ixgb_vlan_rx_register(struct net_device *netdev,
116 struct vlan_group *grp);
117 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
118 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
119 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
120
121 #ifdef CONFIG_NET_POLL_CONTROLLER
122 /* for netdump / net console */
123 static void ixgb_netpoll(struct net_device *dev);
124 #endif
125
126 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
127 enum pci_channel_state state);
128 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
129 static void ixgb_io_resume (struct pci_dev *pdev);
130
131 static struct pci_error_handlers ixgb_err_handler = {
132 .error_detected = ixgb_io_error_detected,
133 .slot_reset = ixgb_io_slot_reset,
134 .resume = ixgb_io_resume,
135 };
136
137 static struct pci_driver ixgb_driver = {
138 .name = ixgb_driver_name,
139 .id_table = ixgb_pci_tbl,
140 .probe = ixgb_probe,
141 .remove = __devexit_p(ixgb_remove),
142 .err_handler = &ixgb_err_handler
143 };
144
145 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
146 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
147 MODULE_LICENSE("GPL");
148 MODULE_VERSION(DRV_VERSION);
149
150 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
151 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
152 module_param(debug, int, 0);
153 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
154
155 /**
156 * ixgb_init_module - Driver Registration Routine
157 *
158 * ixgb_init_module is the first routine called when the driver is
159 * loaded. All it does is register with the PCI subsystem.
160 **/
161
162 static int __init
163 ixgb_init_module(void)
164 {
165 printk(KERN_INFO "%s - version %s\n",
166 ixgb_driver_string, ixgb_driver_version);
167
168 printk(KERN_INFO "%s\n", ixgb_copyright);
169
170 return pci_register_driver(&ixgb_driver);
171 }
172
173 module_init(ixgb_init_module);
174
175 /**
176 * ixgb_exit_module - Driver Exit Cleanup Routine
177 *
178 * ixgb_exit_module is called just before the driver is removed
179 * from memory.
180 **/
181
182 static void __exit
183 ixgb_exit_module(void)
184 {
185 pci_unregister_driver(&ixgb_driver);
186 }
187
188 module_exit(ixgb_exit_module);
189
190 /**
191 * ixgb_irq_disable - Mask off interrupt generation on the NIC
192 * @adapter: board private structure
193 **/
194
195 static void
196 ixgb_irq_disable(struct ixgb_adapter *adapter)
197 {
198 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
199 IXGB_WRITE_FLUSH(&adapter->hw);
200 synchronize_irq(adapter->pdev->irq);
201 }
202
203 /**
204 * ixgb_irq_enable - Enable default interrupt generation settings
205 * @adapter: board private structure
206 **/
207
208 static void
209 ixgb_irq_enable(struct ixgb_adapter *adapter)
210 {
211 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
212 IXGB_INT_TXDW | IXGB_INT_LSC;
213 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
214 val |= IXGB_INT_GPI0;
215 IXGB_WRITE_REG(&adapter->hw, IMS, val);
216 IXGB_WRITE_FLUSH(&adapter->hw);
217 }
218
219 int
220 ixgb_up(struct ixgb_adapter *adapter)
221 {
222 struct net_device *netdev = adapter->netdev;
223 int err, irq_flags = IRQF_SHARED;
224 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
225 struct ixgb_hw *hw = &adapter->hw;
226
227 /* hardware has been reset, we need to reload some things */
228
229 ixgb_rar_set(hw, netdev->dev_addr, 0);
230 ixgb_set_multi(netdev);
231
232 ixgb_restore_vlan(adapter);
233
234 ixgb_configure_tx(adapter);
235 ixgb_setup_rctl(adapter);
236 ixgb_configure_rx(adapter);
237 ixgb_alloc_rx_buffers(adapter);
238
239 /* disable interrupts and get the hardware into a known state */
240 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
241
242 /* only enable MSI if bus is in PCI-X mode */
243 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
244 err = pci_enable_msi(adapter->pdev);
245 if (!err) {
246 adapter->have_msi = 1;
247 irq_flags = 0;
248 }
249 /* proceed to try to request regular interrupt */
250 }
251
252 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
253 netdev->name, netdev);
254 if (err) {
255 if (adapter->have_msi)
256 pci_disable_msi(adapter->pdev);
257 DPRINTK(PROBE, ERR,
258 "Unable to allocate interrupt Error: %d\n", err);
259 return err;
260 }
261
262 if((hw->max_frame_size != max_frame) ||
263 (hw->max_frame_size !=
264 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
265
266 hw->max_frame_size = max_frame;
267
268 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
269
270 if(hw->max_frame_size >
271 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
272 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
273
274 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
275 ctrl0 |= IXGB_CTRL0_JFE;
276 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
277 }
278 }
279 }
280
281 clear_bit(__IXGB_DOWN, &adapter->flags);
282
283 #ifdef CONFIG_IXGB_NAPI
284 napi_enable(&adapter->napi);
285 #endif
286 ixgb_irq_enable(adapter);
287
288 mod_timer(&adapter->watchdog_timer, jiffies);
289
290 return 0;
291 }
292
293 void
294 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
295 {
296 struct net_device *netdev = adapter->netdev;
297
298 /* prevent the interrupt handler from restarting watchdog */
299 set_bit(__IXGB_DOWN, &adapter->flags);
300
301 #ifdef CONFIG_IXGB_NAPI
302 napi_disable(&adapter->napi);
303 #endif
304 /* waiting for NAPI to complete can re-enable interrupts */
305 ixgb_irq_disable(adapter);
306 free_irq(adapter->pdev->irq, netdev);
307
308 if (adapter->have_msi)
309 pci_disable_msi(adapter->pdev);
310
311 if(kill_watchdog)
312 del_timer_sync(&adapter->watchdog_timer);
313
314 adapter->link_speed = 0;
315 adapter->link_duplex = 0;
316 netif_carrier_off(netdev);
317 netif_stop_queue(netdev);
318
319 ixgb_reset(adapter);
320 ixgb_clean_tx_ring(adapter);
321 ixgb_clean_rx_ring(adapter);
322 }
323
324 void
325 ixgb_reset(struct ixgb_adapter *adapter)
326 {
327 struct ixgb_hw *hw = &adapter->hw;
328
329 ixgb_adapter_stop(hw);
330 if (!ixgb_init_hw(hw))
331 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
332
333 /* restore frame size information */
334 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
335 if (hw->max_frame_size >
336 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
337 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
338 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
339 ctrl0 |= IXGB_CTRL0_JFE;
340 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
341 }
342 }
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,
359 const struct pci_device_id *ent)
360 {
361 struct net_device *netdev = NULL;
362 struct ixgb_adapter *adapter;
363 static int cards_found = 0;
364 int pci_using_dac;
365 int i;
366 int err;
367
368 if((err = pci_enable_device(pdev)))
369 return err;
370
371 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
372 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
373 pci_using_dac = 1;
374 } else {
375 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
376 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
377 printk(KERN_ERR
378 "ixgb: No usable DMA configuration, aborting\n");
379 goto err_dma_mask;
380 }
381 pci_using_dac = 0;
382 }
383
384 if((err = pci_request_regions(pdev, ixgb_driver_name)))
385 goto err_request_regions;
386
387 pci_set_master(pdev);
388
389 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
390 if(!netdev) {
391 err = -ENOMEM;
392 goto err_alloc_etherdev;
393 }
394
395 SET_NETDEV_DEV(netdev, &pdev->dev);
396
397 pci_set_drvdata(pdev, netdev);
398 adapter = netdev_priv(netdev);
399 adapter->netdev = netdev;
400 adapter->pdev = pdev;
401 adapter->hw.back = adapter;
402 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
403
404 adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
405 pci_resource_len(pdev, BAR_0));
406 if (!adapter->hw.hw_addr) {
407 err = -EIO;
408 goto err_ioremap;
409 }
410
411 for(i = BAR_1; i <= BAR_5; i++) {
412 if(pci_resource_len(pdev, i) == 0)
413 continue;
414 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
415 adapter->hw.io_base = pci_resource_start(pdev, i);
416 break;
417 }
418 }
419
420 netdev->open = &ixgb_open;
421 netdev->stop = &ixgb_close;
422 netdev->hard_start_xmit = &ixgb_xmit_frame;
423 netdev->get_stats = &ixgb_get_stats;
424 netdev->set_multicast_list = &ixgb_set_multi;
425 netdev->set_mac_address = &ixgb_set_mac;
426 netdev->change_mtu = &ixgb_change_mtu;
427 ixgb_set_ethtool_ops(netdev);
428 netdev->tx_timeout = &ixgb_tx_timeout;
429 netdev->watchdog_timeo = 5 * HZ;
430 #ifdef CONFIG_IXGB_NAPI
431 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
432 #endif
433 netdev->vlan_rx_register = ixgb_vlan_rx_register;
434 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
435 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
436 #ifdef CONFIG_NET_POLL_CONTROLLER
437 netdev->poll_controller = ixgb_netpoll;
438 #endif
439
440 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
441
442 adapter->bd_number = cards_found;
443 adapter->link_speed = 0;
444 adapter->link_duplex = 0;
445
446 /* setup the private structure */
447
448 if((err = ixgb_sw_init(adapter)))
449 goto err_sw_init;
450
451 netdev->features = NETIF_F_SG |
452 NETIF_F_HW_CSUM |
453 NETIF_F_HW_VLAN_TX |
454 NETIF_F_HW_VLAN_RX |
455 NETIF_F_HW_VLAN_FILTER;
456 netdev->features |= NETIF_F_TSO;
457
458 if(pci_using_dac)
459 netdev->features |= NETIF_F_HIGHDMA;
460
461 /* make sure the EEPROM is good */
462
463 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
464 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
465 err = -EIO;
466 goto err_eeprom;
467 }
468
469 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
470 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
471
472 if(!is_valid_ether_addr(netdev->perm_addr)) {
473 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
474 err = -EIO;
475 goto err_eeprom;
476 }
477
478 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
479
480 init_timer(&adapter->watchdog_timer);
481 adapter->watchdog_timer.function = &ixgb_watchdog;
482 adapter->watchdog_timer.data = (unsigned long)adapter;
483
484 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
485
486 strcpy(netdev->name, "eth%d");
487 if((err = register_netdev(netdev)))
488 goto err_register;
489
490 /* we're going to reset, so assume we have no link for now */
491
492 netif_carrier_off(netdev);
493 netif_stop_queue(netdev);
494
495 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
496 ixgb_check_options(adapter);
497 /* reset the hardware with the new settings */
498
499 ixgb_reset(adapter);
500
501 cards_found++;
502 return 0;
503
504 err_register:
505 err_sw_init:
506 err_eeprom:
507 iounmap(adapter->hw.hw_addr);
508 err_ioremap:
509 free_netdev(netdev);
510 err_alloc_etherdev:
511 pci_release_regions(pdev);
512 err_request_regions:
513 err_dma_mask:
514 pci_disable_device(pdev);
515 return err;
516 }
517
518 /**
519 * ixgb_remove - Device Removal Routine
520 * @pdev: PCI device information struct
521 *
522 * ixgb_remove is called by the PCI subsystem to alert the driver
523 * that it should release a PCI device. The could be caused by a
524 * Hot-Plug event, or because the driver is going to be removed from
525 * memory.
526 **/
527
528 static void __devexit
529 ixgb_remove(struct pci_dev *pdev)
530 {
531 struct net_device *netdev = pci_get_drvdata(pdev);
532 struct ixgb_adapter *adapter = netdev_priv(netdev);
533
534 flush_scheduled_work();
535
536 unregister_netdev(netdev);
537
538 iounmap(adapter->hw.hw_addr);
539 pci_release_regions(pdev);
540
541 free_netdev(netdev);
542 }
543
544 /**
545 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
546 * @adapter: board private structure to initialize
547 *
548 * ixgb_sw_init initializes the Adapter private data structure.
549 * Fields are initialized based on PCI device information and
550 * OS network device settings (MTU size).
551 **/
552
553 static int __devinit
554 ixgb_sw_init(struct ixgb_adapter *adapter)
555 {
556 struct ixgb_hw *hw = &adapter->hw;
557 struct net_device *netdev = adapter->netdev;
558 struct pci_dev *pdev = adapter->pdev;
559
560 /* PCI config space info */
561
562 hw->vendor_id = pdev->vendor;
563 hw->device_id = pdev->device;
564 hw->subsystem_vendor_id = pdev->subsystem_vendor;
565 hw->subsystem_id = pdev->subsystem_device;
566
567 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
568 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
569
570 if((hw->device_id == IXGB_DEVICE_ID_82597EX)
571 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
572 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
573 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
574 hw->mac_type = ixgb_82597;
575 else {
576 /* should never have loaded on this device */
577 DPRINTK(PROBE, ERR, "unsupported device id\n");
578 }
579
580 /* enable flow control to be programmed */
581 hw->fc.send_xon = 1;
582
583 set_bit(__IXGB_DOWN, &adapter->flags);
584 return 0;
585 }
586
587 /**
588 * ixgb_open - Called when a network interface is made active
589 * @netdev: network interface device structure
590 *
591 * Returns 0 on success, negative value on failure
592 *
593 * The open entry point is called when a network interface is made
594 * active by the system (IFF_UP). At this point all resources needed
595 * for transmit and receive operations are allocated, the interrupt
596 * handler is registered with the OS, the watchdog timer is started,
597 * and the stack is notified that the interface is ready.
598 **/
599
600 static int
601 ixgb_open(struct net_device *netdev)
602 {
603 struct ixgb_adapter *adapter = netdev_priv(netdev);
604 int err;
605
606 /* allocate transmit descriptors */
607
608 if((err = ixgb_setup_tx_resources(adapter)))
609 goto err_setup_tx;
610
611 /* allocate receive descriptors */
612
613 if((err = ixgb_setup_rx_resources(adapter)))
614 goto err_setup_rx;
615
616 if((err = ixgb_up(adapter)))
617 goto err_up;
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 DPRINTK(PROBE, ERR,
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 = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
685 if(!txdr->desc) {
686 vfree(txdr->buffer_info);
687 DPRINTK(PROBE, ERR,
688 "Unable to allocate transmit descriptor memory\n");
689 return -ENOMEM;
690 }
691 memset(txdr->desc, 0, txdr->size);
692
693 txdr->next_to_use = 0;
694 txdr->next_to_clean = 0;
695
696 return 0;
697 }
698
699 /**
700 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
701 * @adapter: board private structure
702 *
703 * Configure the Tx unit of the MAC after a reset.
704 **/
705
706 static void
707 ixgb_configure_tx(struct ixgb_adapter *adapter)
708 {
709 u64 tdba = adapter->tx_ring.dma;
710 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
711 u32 tctl;
712 struct ixgb_hw *hw = &adapter->hw;
713
714 /* Setup the Base and Length of the Tx Descriptor Ring
715 * tx_ring.dma can be either a 32 or 64 bit value
716 */
717
718 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
719 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
720
721 IXGB_WRITE_REG(hw, TDLEN, tdlen);
722
723 /* Setup the HW Tx Head and Tail descriptor pointers */
724
725 IXGB_WRITE_REG(hw, TDH, 0);
726 IXGB_WRITE_REG(hw, TDT, 0);
727
728 /* don't set up txdctl, it induces performance problems if configured
729 * incorrectly */
730 /* Set the Tx Interrupt Delay register */
731
732 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
733
734 /* Program the Transmit Control Register */
735
736 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
737 IXGB_WRITE_REG(hw, TCTL, tctl);
738
739 /* Setup Transmit Descriptor Settings for this adapter */
740 adapter->tx_cmd_type =
741 IXGB_TX_DESC_TYPE
742 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
743 }
744
745 /**
746 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
747 * @adapter: board private structure
748 *
749 * Returns 0 on success, negative on failure
750 **/
751
752 int
753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
754 {
755 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
756 struct pci_dev *pdev = adapter->pdev;
757 int size;
758
759 size = sizeof(struct ixgb_buffer) * rxdr->count;
760 rxdr->buffer_info = vmalloc(size);
761 if(!rxdr->buffer_info) {
762 DPRINTK(PROBE, ERR,
763 "Unable to allocate receive descriptor ring\n");
764 return -ENOMEM;
765 }
766 memset(rxdr->buffer_info, 0, size);
767
768 /* Round up to nearest 4K */
769
770 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
771 rxdr->size = ALIGN(rxdr->size, 4096);
772
773 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
774
775 if(!rxdr->desc) {
776 vfree(rxdr->buffer_info);
777 DPRINTK(PROBE, ERR,
778 "Unable to allocate receive descriptors\n");
779 return -ENOMEM;
780 }
781 memset(rxdr->desc, 0, rxdr->size);
782
783 rxdr->next_to_clean = 0;
784 rxdr->next_to_use = 0;
785
786 return 0;
787 }
788
789 /**
790 * ixgb_setup_rctl - configure the receive control register
791 * @adapter: Board private structure
792 **/
793
794 static void
795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
796 {
797 u32 rctl;
798
799 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
800
801 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
802
803 rctl |=
804 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
805 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
806 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
807
808 rctl |= IXGB_RCTL_SECRC;
809
810 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
811 rctl |= IXGB_RCTL_BSIZE_2048;
812 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
813 rctl |= IXGB_RCTL_BSIZE_4096;
814 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
815 rctl |= IXGB_RCTL_BSIZE_8192;
816 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
817 rctl |= IXGB_RCTL_BSIZE_16384;
818
819 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
820 }
821
822 /**
823 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
824 * @adapter: board private structure
825 *
826 * Configure the Rx unit of the MAC after a reset.
827 **/
828
829 static void
830 ixgb_configure_rx(struct ixgb_adapter *adapter)
831 {
832 u64 rdba = adapter->rx_ring.dma;
833 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
834 struct ixgb_hw *hw = &adapter->hw;
835 u32 rctl;
836 u32 rxcsum;
837
838 /* make sure receives are disabled while setting up the descriptors */
839
840 rctl = IXGB_READ_REG(hw, RCTL);
841 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
842
843 /* set the Receive Delay Timer Register */
844
845 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
846
847 /* Setup the Base and Length of the Rx Descriptor Ring */
848
849 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
850 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
851
852 IXGB_WRITE_REG(hw, RDLEN, rdlen);
853
854 /* Setup the HW Rx Head and Tail Descriptor Pointers */
855 IXGB_WRITE_REG(hw, RDH, 0);
856 IXGB_WRITE_REG(hw, RDT, 0);
857
858 /* due to the hardware errata with RXDCTL, we are unable to use any of
859 * the performance enhancing features of it without causing other
860 * subtle bugs, some of the bugs could include receive length
861 * corruption at high data rates (WTHRESH > 0) and/or receive
862 * descriptor ring irregularites (particularly in hardware cache) */
863 IXGB_WRITE_REG(hw, RXDCTL, 0);
864
865 /* Enable Receive Checksum Offload for TCP and UDP */
866 if (adapter->rx_csum) {
867 rxcsum = IXGB_READ_REG(hw, RXCSUM);
868 rxcsum |= IXGB_RXCSUM_TUOFL;
869 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
870 }
871
872 /* Enable Receives */
873
874 IXGB_WRITE_REG(hw, RCTL, rctl);
875 }
876
877 /**
878 * ixgb_free_tx_resources - Free Tx Resources
879 * @adapter: board private structure
880 *
881 * Free all transmit software resources
882 **/
883
884 void
885 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
886 {
887 struct pci_dev *pdev = adapter->pdev;
888
889 ixgb_clean_tx_ring(adapter);
890
891 vfree(adapter->tx_ring.buffer_info);
892 adapter->tx_ring.buffer_info = NULL;
893
894 pci_free_consistent(pdev, adapter->tx_ring.size,
895 adapter->tx_ring.desc, adapter->tx_ring.dma);
896
897 adapter->tx_ring.desc = NULL;
898 }
899
900 static void
901 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
902 struct ixgb_buffer *buffer_info)
903 {
904 struct pci_dev *pdev = adapter->pdev;
905
906 if (buffer_info->dma)
907 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
908 PCI_DMA_TODEVICE);
909
910 if (buffer_info->skb)
911 dev_kfree_skb_any(buffer_info->skb);
912
913 buffer_info->skb = NULL;
914 buffer_info->dma = 0;
915 buffer_info->time_stamp = 0;
916 /* these fields must always be initialized in tx
917 * buffer_info->length = 0;
918 * buffer_info->next_to_watch = 0; */
919 }
920
921 /**
922 * ixgb_clean_tx_ring - Free Tx Buffers
923 * @adapter: board private structure
924 **/
925
926 static void
927 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
928 {
929 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
930 struct ixgb_buffer *buffer_info;
931 unsigned long size;
932 unsigned int i;
933
934 /* Free all the Tx ring sk_buffs */
935
936 for(i = 0; i < tx_ring->count; i++) {
937 buffer_info = &tx_ring->buffer_info[i];
938 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
939 }
940
941 size = sizeof(struct ixgb_buffer) * tx_ring->count;
942 memset(tx_ring->buffer_info, 0, size);
943
944 /* Zero out the descriptor ring */
945
946 memset(tx_ring->desc, 0, tx_ring->size);
947
948 tx_ring->next_to_use = 0;
949 tx_ring->next_to_clean = 0;
950
951 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
952 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
953 }
954
955 /**
956 * ixgb_free_rx_resources - Free Rx Resources
957 * @adapter: board private structure
958 *
959 * Free all receive software resources
960 **/
961
962 void
963 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
964 {
965 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
966 struct pci_dev *pdev = adapter->pdev;
967
968 ixgb_clean_rx_ring(adapter);
969
970 vfree(rx_ring->buffer_info);
971 rx_ring->buffer_info = NULL;
972
973 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
974
975 rx_ring->desc = NULL;
976 }
977
978 /**
979 * ixgb_clean_rx_ring - Free Rx Buffers
980 * @adapter: board private structure
981 **/
982
983 static void
984 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
985 {
986 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
987 struct ixgb_buffer *buffer_info;
988 struct pci_dev *pdev = adapter->pdev;
989 unsigned long size;
990 unsigned int i;
991
992 /* Free all the Rx ring sk_buffs */
993
994 for(i = 0; i < rx_ring->count; i++) {
995 buffer_info = &rx_ring->buffer_info[i];
996 if(buffer_info->skb) {
997
998 pci_unmap_single(pdev,
999 buffer_info->dma,
1000 buffer_info->length,
1001 PCI_DMA_FROMDEVICE);
1002
1003 dev_kfree_skb(buffer_info->skb);
1004
1005 buffer_info->skb = NULL;
1006 }
1007 }
1008
1009 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1010 memset(rx_ring->buffer_info, 0, size);
1011
1012 /* Zero out the descriptor ring */
1013
1014 memset(rx_ring->desc, 0, rx_ring->size);
1015
1016 rx_ring->next_to_clean = 0;
1017 rx_ring->next_to_use = 0;
1018
1019 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1020 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1021 }
1022
1023 /**
1024 * ixgb_set_mac - Change the Ethernet Address of the NIC
1025 * @netdev: network interface device structure
1026 * @p: pointer to an address structure
1027 *
1028 * Returns 0 on success, negative on failure
1029 **/
1030
1031 static int
1032 ixgb_set_mac(struct net_device *netdev, void *p)
1033 {
1034 struct ixgb_adapter *adapter = netdev_priv(netdev);
1035 struct sockaddr *addr = p;
1036
1037 if(!is_valid_ether_addr(addr->sa_data))
1038 return -EADDRNOTAVAIL;
1039
1040 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1041
1042 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1043
1044 return 0;
1045 }
1046
1047 /**
1048 * ixgb_set_multi - Multicast and Promiscuous mode set
1049 * @netdev: network interface device structure
1050 *
1051 * The set_multi entry point is called whenever the multicast address
1052 * list or the network interface flags are updated. This routine is
1053 * responsible for configuring the hardware for proper multicast,
1054 * promiscuous mode, and all-multi behavior.
1055 **/
1056
1057 static void
1058 ixgb_set_multi(struct net_device *netdev)
1059 {
1060 struct ixgb_adapter *adapter = netdev_priv(netdev);
1061 struct ixgb_hw *hw = &adapter->hw;
1062 struct dev_mc_list *mc_ptr;
1063 u32 rctl;
1064 int i;
1065
1066 /* Check for Promiscuous and All Multicast modes */
1067
1068 rctl = IXGB_READ_REG(hw, RCTL);
1069
1070 if(netdev->flags & IFF_PROMISC) {
1071 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1072 } else if(netdev->flags & IFF_ALLMULTI) {
1073 rctl |= IXGB_RCTL_MPE;
1074 rctl &= ~IXGB_RCTL_UPE;
1075 } else {
1076 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077 }
1078
1079 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1080 rctl |= IXGB_RCTL_MPE;
1081 IXGB_WRITE_REG(hw, RCTL, rctl);
1082 } else {
1083 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1084 IXGB_ETH_LENGTH_OF_ADDRESS];
1085
1086 IXGB_WRITE_REG(hw, RCTL, rctl);
1087
1088 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1089 i++, mc_ptr = mc_ptr->next)
1090 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1091 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1092
1093 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1094 }
1095 }
1096
1097 /**
1098 * ixgb_watchdog - Timer Call-back
1099 * @data: pointer to netdev cast into an unsigned long
1100 **/
1101
1102 static void
1103 ixgb_watchdog(unsigned long data)
1104 {
1105 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1106 struct net_device *netdev = adapter->netdev;
1107 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1108
1109 ixgb_check_for_link(&adapter->hw);
1110
1111 if (ixgb_check_for_bad_link(&adapter->hw)) {
1112 /* force the reset path */
1113 netif_stop_queue(netdev);
1114 }
1115
1116 if(adapter->hw.link_up) {
1117 if(!netif_carrier_ok(netdev)) {
1118 DPRINTK(LINK, INFO,
1119 "NIC Link is Up 10000 Mbps Full Duplex\n");
1120 adapter->link_speed = 10000;
1121 adapter->link_duplex = FULL_DUPLEX;
1122 netif_carrier_on(netdev);
1123 netif_wake_queue(netdev);
1124 }
1125 } else {
1126 if(netif_carrier_ok(netdev)) {
1127 adapter->link_speed = 0;
1128 adapter->link_duplex = 0;
1129 DPRINTK(LINK, INFO, "NIC Link is Down\n");
1130 netif_carrier_off(netdev);
1131 netif_stop_queue(netdev);
1132
1133 }
1134 }
1135
1136 ixgb_update_stats(adapter);
1137
1138 if(!netif_carrier_ok(netdev)) {
1139 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1140 /* We've lost link, so the controller stops DMA,
1141 * but we've got queued Tx work that's never going
1142 * to get done, so reset controller to flush Tx.
1143 * (Do the reset outside of interrupt context). */
1144 schedule_work(&adapter->tx_timeout_task);
1145 }
1146 }
1147
1148 /* Force detection of hung controller every watchdog period */
1149 adapter->detect_tx_hung = true;
1150
1151 /* generate an interrupt to force clean up of any stragglers */
1152 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1153
1154 /* Reset the timer */
1155 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1156 }
1157
1158 #define IXGB_TX_FLAGS_CSUM 0x00000001
1159 #define IXGB_TX_FLAGS_VLAN 0x00000002
1160 #define IXGB_TX_FLAGS_TSO 0x00000004
1161
1162 static int
1163 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1164 {
1165 struct ixgb_context_desc *context_desc;
1166 unsigned int i;
1167 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1168 u16 ipcse, tucse, mss;
1169 int err;
1170
1171 if (likely(skb_is_gso(skb))) {
1172 struct ixgb_buffer *buffer_info;
1173 struct iphdr *iph;
1174
1175 if (skb_header_cloned(skb)) {
1176 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1177 if (err)
1178 return err;
1179 }
1180
1181 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1182 mss = skb_shinfo(skb)->gso_size;
1183 iph = ip_hdr(skb);
1184 iph->tot_len = 0;
1185 iph->check = 0;
1186 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1187 iph->daddr, 0,
1188 IPPROTO_TCP, 0);
1189 ipcss = skb_network_offset(skb);
1190 ipcso = (void *)&(iph->check) - (void *)skb->data;
1191 ipcse = skb_transport_offset(skb) - 1;
1192 tucss = skb_transport_offset(skb);
1193 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1194 tucse = 0;
1195
1196 i = adapter->tx_ring.next_to_use;
1197 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1198 buffer_info = &adapter->tx_ring.buffer_info[i];
1199 WARN_ON(buffer_info->dma != 0);
1200
1201 context_desc->ipcss = ipcss;
1202 context_desc->ipcso = ipcso;
1203 context_desc->ipcse = cpu_to_le16(ipcse);
1204 context_desc->tucss = tucss;
1205 context_desc->tucso = tucso;
1206 context_desc->tucse = cpu_to_le16(tucse);
1207 context_desc->mss = cpu_to_le16(mss);
1208 context_desc->hdr_len = hdr_len;
1209 context_desc->status = 0;
1210 context_desc->cmd_type_len = cpu_to_le32(
1211 IXGB_CONTEXT_DESC_TYPE
1212 | IXGB_CONTEXT_DESC_CMD_TSE
1213 | IXGB_CONTEXT_DESC_CMD_IP
1214 | IXGB_CONTEXT_DESC_CMD_TCP
1215 | IXGB_CONTEXT_DESC_CMD_IDE
1216 | (skb->len - (hdr_len)));
1217
1218
1219 if(++i == adapter->tx_ring.count) i = 0;
1220 adapter->tx_ring.next_to_use = i;
1221
1222 return 1;
1223 }
1224
1225 return 0;
1226 }
1227
1228 static bool
1229 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1230 {
1231 struct ixgb_context_desc *context_desc;
1232 unsigned int i;
1233 u8 css, cso;
1234
1235 if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1236 struct ixgb_buffer *buffer_info;
1237 css = skb_transport_offset(skb);
1238 cso = css + skb->csum_offset;
1239
1240 i = adapter->tx_ring.next_to_use;
1241 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1242 buffer_info = &adapter->tx_ring.buffer_info[i];
1243 WARN_ON(buffer_info->dma != 0);
1244
1245 context_desc->tucss = css;
1246 context_desc->tucso = cso;
1247 context_desc->tucse = 0;
1248 /* zero out any previously existing data in one instruction */
1249 *(u32 *)&(context_desc->ipcss) = 0;
1250 context_desc->status = 0;
1251 context_desc->hdr_len = 0;
1252 context_desc->mss = 0;
1253 context_desc->cmd_type_len =
1254 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1255 | IXGB_TX_DESC_CMD_IDE);
1256
1257 if(++i == adapter->tx_ring.count) i = 0;
1258 adapter->tx_ring.next_to_use = i;
1259
1260 return true;
1261 }
1262
1263 return false;
1264 }
1265
1266 #define IXGB_MAX_TXD_PWR 14
1267 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1268
1269 static int
1270 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1271 unsigned int first)
1272 {
1273 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1274 struct ixgb_buffer *buffer_info;
1275 int len = skb->len;
1276 unsigned int offset = 0, size, count = 0, i;
1277 unsigned int mss = skb_shinfo(skb)->gso_size;
1278
1279 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1280 unsigned int f;
1281
1282 len -= skb->data_len;
1283
1284 i = tx_ring->next_to_use;
1285
1286 while(len) {
1287 buffer_info = &tx_ring->buffer_info[i];
1288 size = min(len, IXGB_MAX_DATA_PER_TXD);
1289 /* Workaround for premature desc write-backs
1290 * in TSO mode. Append 4-byte sentinel desc */
1291 if (unlikely(mss && !nr_frags && size == len && size > 8))
1292 size -= 4;
1293
1294 buffer_info->length = size;
1295 WARN_ON(buffer_info->dma != 0);
1296 buffer_info->time_stamp = jiffies;
1297 buffer_info->dma =
1298 pci_map_single(adapter->pdev,
1299 skb->data + offset,
1300 size,
1301 PCI_DMA_TODEVICE);
1302 buffer_info->next_to_watch = 0;
1303
1304 len -= size;
1305 offset += size;
1306 count++;
1307 if(++i == tx_ring->count) i = 0;
1308 }
1309
1310 for(f = 0; f < nr_frags; f++) {
1311 struct skb_frag_struct *frag;
1312
1313 frag = &skb_shinfo(skb)->frags[f];
1314 len = frag->size;
1315 offset = 0;
1316
1317 while(len) {
1318 buffer_info = &tx_ring->buffer_info[i];
1319 size = min(len, IXGB_MAX_DATA_PER_TXD);
1320
1321 /* Workaround for premature desc write-backs
1322 * in TSO mode. Append 4-byte sentinel desc */
1323 if (unlikely(mss && (f == (nr_frags - 1))
1324 && size == len && size > 8))
1325 size -= 4;
1326
1327 buffer_info->length = size;
1328 buffer_info->time_stamp = jiffies;
1329 buffer_info->dma =
1330 pci_map_page(adapter->pdev,
1331 frag->page,
1332 frag->page_offset + offset,
1333 size,
1334 PCI_DMA_TODEVICE);
1335 buffer_info->next_to_watch = 0;
1336
1337 len -= size;
1338 offset += size;
1339 count++;
1340 if(++i == tx_ring->count) i = 0;
1341 }
1342 }
1343 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1344 tx_ring->buffer_info[i].skb = skb;
1345 tx_ring->buffer_info[first].next_to_watch = i;
1346
1347 return count;
1348 }
1349
1350 static void
1351 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1352 {
1353 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1354 struct ixgb_tx_desc *tx_desc = NULL;
1355 struct ixgb_buffer *buffer_info;
1356 u32 cmd_type_len = adapter->tx_cmd_type;
1357 u8 status = 0;
1358 u8 popts = 0;
1359 unsigned int i;
1360
1361 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1362 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1363 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1364 }
1365
1366 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1367 popts |= IXGB_TX_DESC_POPTS_TXSM;
1368
1369 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1370 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1371 }
1372
1373 i = tx_ring->next_to_use;
1374
1375 while(count--) {
1376 buffer_info = &tx_ring->buffer_info[i];
1377 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1378 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1379 tx_desc->cmd_type_len =
1380 cpu_to_le32(cmd_type_len | buffer_info->length);
1381 tx_desc->status = status;
1382 tx_desc->popts = popts;
1383 tx_desc->vlan = cpu_to_le16(vlan_id);
1384
1385 if(++i == tx_ring->count) i = 0;
1386 }
1387
1388 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1389 | IXGB_TX_DESC_CMD_RS );
1390
1391 /* Force memory writes to complete before letting h/w
1392 * know there are new descriptors to fetch. (Only
1393 * applicable for weak-ordered memory model archs,
1394 * such as IA-64). */
1395 wmb();
1396
1397 tx_ring->next_to_use = i;
1398 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1399 }
1400
1401 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1402 {
1403 struct ixgb_adapter *adapter = netdev_priv(netdev);
1404 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1405
1406 netif_stop_queue(netdev);
1407 /* Herbert's original patch had:
1408 * smp_mb__after_netif_stop_queue();
1409 * but since that doesn't exist yet, just open code it. */
1410 smp_mb();
1411
1412 /* We need to check again in a case another CPU has just
1413 * made room available. */
1414 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1415 return -EBUSY;
1416
1417 /* A reprieve! */
1418 netif_start_queue(netdev);
1419 ++adapter->restart_queue;
1420 return 0;
1421 }
1422
1423 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1424 struct ixgb_desc_ring *tx_ring, int size)
1425 {
1426 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1427 return 0;
1428 return __ixgb_maybe_stop_tx(netdev, size);
1429 }
1430
1431
1432 /* Tx Descriptors needed, worst case */
1433 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1434 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1435 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1436 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1437 + 1 /* one more needed for sentinel TSO workaround */
1438
1439 static int
1440 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1441 {
1442 struct ixgb_adapter *adapter = netdev_priv(netdev);
1443 unsigned int first;
1444 unsigned int tx_flags = 0;
1445 int vlan_id = 0;
1446 int tso;
1447
1448 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1449 dev_kfree_skb(skb);
1450 return NETDEV_TX_OK;
1451 }
1452
1453 if(skb->len <= 0) {
1454 dev_kfree_skb_any(skb);
1455 return 0;
1456 }
1457
1458 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1459 DESC_NEEDED)))
1460 return NETDEV_TX_BUSY;
1461
1462 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1463 tx_flags |= IXGB_TX_FLAGS_VLAN;
1464 vlan_id = vlan_tx_tag_get(skb);
1465 }
1466
1467 first = adapter->tx_ring.next_to_use;
1468
1469 tso = ixgb_tso(adapter, skb);
1470 if (tso < 0) {
1471 dev_kfree_skb_any(skb);
1472 return NETDEV_TX_OK;
1473 }
1474
1475 if (likely(tso))
1476 tx_flags |= IXGB_TX_FLAGS_TSO;
1477 else if(ixgb_tx_csum(adapter, skb))
1478 tx_flags |= IXGB_TX_FLAGS_CSUM;
1479
1480 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1481 tx_flags);
1482
1483 netdev->trans_start = jiffies;
1484
1485 /* Make sure there is space in the ring for the next send. */
1486 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1487
1488 return NETDEV_TX_OK;
1489 }
1490
1491 /**
1492 * ixgb_tx_timeout - Respond to a Tx Hang
1493 * @netdev: network interface device structure
1494 **/
1495
1496 static void
1497 ixgb_tx_timeout(struct net_device *netdev)
1498 {
1499 struct ixgb_adapter *adapter = netdev_priv(netdev);
1500
1501 /* Do the reset outside of interrupt context */
1502 schedule_work(&adapter->tx_timeout_task);
1503 }
1504
1505 static void
1506 ixgb_tx_timeout_task(struct work_struct *work)
1507 {
1508 struct ixgb_adapter *adapter =
1509 container_of(work, struct ixgb_adapter, tx_timeout_task);
1510
1511 adapter->tx_timeout_count++;
1512 ixgb_down(adapter, true);
1513 ixgb_up(adapter);
1514 }
1515
1516 /**
1517 * ixgb_get_stats - Get System Network Statistics
1518 * @netdev: network interface device structure
1519 *
1520 * Returns the address of the device statistics structure.
1521 * The statistics are actually updated from the timer callback.
1522 **/
1523
1524 static struct net_device_stats *
1525 ixgb_get_stats(struct net_device *netdev)
1526 {
1527 struct ixgb_adapter *adapter = netdev_priv(netdev);
1528
1529 return &adapter->net_stats;
1530 }
1531
1532 /**
1533 * ixgb_change_mtu - Change the Maximum Transfer Unit
1534 * @netdev: network interface device structure
1535 * @new_mtu: new value for maximum frame size
1536 *
1537 * Returns 0 on success, negative on failure
1538 **/
1539
1540 static int
1541 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1542 {
1543 struct ixgb_adapter *adapter = netdev_priv(netdev);
1544 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1545 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1546
1547 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1548 if ((new_mtu < 68) ||
1549 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1550 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1551 return -EINVAL;
1552 }
1553
1554 if (old_max_frame == max_frame)
1555 return 0;
1556
1557 if (netif_running(netdev))
1558 ixgb_down(adapter, true);
1559
1560 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1561
1562 netdev->mtu = new_mtu;
1563
1564 if (netif_running(netdev))
1565 ixgb_up(adapter);
1566
1567 return 0;
1568 }
1569
1570 /**
1571 * ixgb_update_stats - Update the board statistics counters.
1572 * @adapter: board private structure
1573 **/
1574
1575 void
1576 ixgb_update_stats(struct ixgb_adapter *adapter)
1577 {
1578 struct net_device *netdev = adapter->netdev;
1579 struct pci_dev *pdev = adapter->pdev;
1580
1581 /* Prevent stats update while adapter is being reset */
1582 if (pci_channel_offline(pdev))
1583 return;
1584
1585 if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1586 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1587 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1588 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1589 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1590 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1591
1592 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1593 /* fix up multicast stats by removing broadcasts */
1594 if(multi >= bcast)
1595 multi -= bcast;
1596
1597 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1598 adapter->stats.mprch += (multi >> 32);
1599 adapter->stats.bprcl += bcast_l;
1600 adapter->stats.bprch += bcast_h;
1601 } else {
1602 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1603 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1604 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1605 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1606 }
1607 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1608 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1609 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1610 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1611 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1612 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1613 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1614 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1615 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1616 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1617 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1618 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1619 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1620 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1621 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1622 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1623 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1624 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1625 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1626 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1627 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1628 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1629 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1630 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1631 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1632 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1633 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1634 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1635 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1636 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1637 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1638 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1639 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1640 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1641 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1642 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1643 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1644 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1645 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1646 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1647 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1648 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1649 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1650 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1651 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1652 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1653 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1654 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1655 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1656 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1657 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1658 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1659 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1660 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1661 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1662 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1663
1664 /* Fill out the OS statistics structure */
1665
1666 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1667 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1668 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1669 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1670 adapter->net_stats.multicast = adapter->stats.mprcl;
1671 adapter->net_stats.collisions = 0;
1672
1673 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1674 * with a length in the type/len field */
1675 adapter->net_stats.rx_errors =
1676 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1677 adapter->stats.ruc +
1678 adapter->stats.roc /*+ adapter->stats.rlec */ +
1679 adapter->stats.icbc +
1680 adapter->stats.ecbc + adapter->stats.mpc;
1681
1682 /* see above
1683 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1684 */
1685
1686 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1687 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1688 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1689 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1690
1691 adapter->net_stats.tx_errors = 0;
1692 adapter->net_stats.rx_frame_errors = 0;
1693 adapter->net_stats.tx_aborted_errors = 0;
1694 adapter->net_stats.tx_carrier_errors = 0;
1695 adapter->net_stats.tx_fifo_errors = 0;
1696 adapter->net_stats.tx_heartbeat_errors = 0;
1697 adapter->net_stats.tx_window_errors = 0;
1698 }
1699
1700 #define IXGB_MAX_INTR 10
1701 /**
1702 * ixgb_intr - Interrupt Handler
1703 * @irq: interrupt number
1704 * @data: pointer to a network interface device structure
1705 **/
1706
1707 static irqreturn_t
1708 ixgb_intr(int irq, void *data)
1709 {
1710 struct net_device *netdev = data;
1711 struct ixgb_adapter *adapter = netdev_priv(netdev);
1712 struct ixgb_hw *hw = &adapter->hw;
1713 u32 icr = IXGB_READ_REG(hw, ICR);
1714 #ifndef CONFIG_IXGB_NAPI
1715 unsigned int i;
1716 #endif
1717
1718 if(unlikely(!icr))
1719 return IRQ_NONE; /* Not our interrupt */
1720
1721 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1722 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1723 mod_timer(&adapter->watchdog_timer, jiffies);
1724
1725 #ifdef CONFIG_IXGB_NAPI
1726 if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1727
1728 /* Disable interrupts and register for poll. The flush
1729 of the posted write is intentionally left out.
1730 */
1731
1732 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1733 __netif_rx_schedule(netdev, &adapter->napi);
1734 }
1735 #else
1736 /* yes, that is actually a & and it is meant to make sure that
1737 * every pass through this for loop checks both receive and
1738 * transmit queues for completed descriptors, intended to
1739 * avoid starvation issues and assist tx/rx fairness. */
1740 for(i = 0; i < IXGB_MAX_INTR; i++)
1741 if(!ixgb_clean_rx_irq(adapter) &
1742 !ixgb_clean_tx_irq(adapter))
1743 break;
1744 #endif
1745 return IRQ_HANDLED;
1746 }
1747
1748 #ifdef CONFIG_IXGB_NAPI
1749 /**
1750 * ixgb_clean - NAPI Rx polling callback
1751 * @adapter: board private structure
1752 **/
1753
1754 static int
1755 ixgb_clean(struct napi_struct *napi, int budget)
1756 {
1757 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1758 struct net_device *netdev = adapter->netdev;
1759 int work_done = 0;
1760
1761 ixgb_clean_tx_irq(adapter);
1762 ixgb_clean_rx_irq(adapter, &work_done, budget);
1763
1764 /* If budget not fully consumed, exit the polling mode */
1765 if (work_done < budget) {
1766 netif_rx_complete(netdev, napi);
1767 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1768 ixgb_irq_enable(adapter);
1769 }
1770
1771 return work_done;
1772 }
1773 #endif
1774
1775 /**
1776 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1777 * @adapter: board private structure
1778 **/
1779
1780 static bool
1781 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1782 {
1783 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1784 struct net_device *netdev = adapter->netdev;
1785 struct ixgb_tx_desc *tx_desc, *eop_desc;
1786 struct ixgb_buffer *buffer_info;
1787 unsigned int i, eop;
1788 bool cleaned = false;
1789
1790 i = tx_ring->next_to_clean;
1791 eop = tx_ring->buffer_info[i].next_to_watch;
1792 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1793
1794 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1795
1796 for (cleaned = false; !cleaned; ) {
1797 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1798 buffer_info = &tx_ring->buffer_info[i];
1799
1800 if (tx_desc->popts
1801 & (IXGB_TX_DESC_POPTS_TXSM |
1802 IXGB_TX_DESC_POPTS_IXSM))
1803 adapter->hw_csum_tx_good++;
1804
1805 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1806
1807 *(u32 *)&(tx_desc->status) = 0;
1808
1809 cleaned = (i == eop);
1810 if(++i == tx_ring->count) i = 0;
1811 }
1812
1813 eop = tx_ring->buffer_info[i].next_to_watch;
1814 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1815 }
1816
1817 tx_ring->next_to_clean = i;
1818
1819 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1820 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1821 /* Make sure that anybody stopping the queue after this
1822 * sees the new next_to_clean. */
1823 smp_mb();
1824
1825 if (netif_queue_stopped(netdev) &&
1826 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1827 netif_wake_queue(netdev);
1828 ++adapter->restart_queue;
1829 }
1830 }
1831
1832 if(adapter->detect_tx_hung) {
1833 /* detect a transmit hang in hardware, this serializes the
1834 * check with the clearing of time_stamp and movement of i */
1835 adapter->detect_tx_hung = false;
1836 if (tx_ring->buffer_info[eop].dma &&
1837 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1838 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1839 IXGB_STATUS_TXOFF)) {
1840 /* detected Tx unit hang */
1841 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1842 " TDH <%x>\n"
1843 " TDT <%x>\n"
1844 " next_to_use <%x>\n"
1845 " next_to_clean <%x>\n"
1846 "buffer_info[next_to_clean]\n"
1847 " time_stamp <%lx>\n"
1848 " next_to_watch <%x>\n"
1849 " jiffies <%lx>\n"
1850 " next_to_watch.status <%x>\n",
1851 IXGB_READ_REG(&adapter->hw, TDH),
1852 IXGB_READ_REG(&adapter->hw, TDT),
1853 tx_ring->next_to_use,
1854 tx_ring->next_to_clean,
1855 tx_ring->buffer_info[eop].time_stamp,
1856 eop,
1857 jiffies,
1858 eop_desc->status);
1859 netif_stop_queue(netdev);
1860 }
1861 }
1862
1863 return cleaned;
1864 }
1865
1866 /**
1867 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1868 * @adapter: board private structure
1869 * @rx_desc: receive descriptor
1870 * @sk_buff: socket buffer with received data
1871 **/
1872
1873 static void
1874 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1875 struct ixgb_rx_desc *rx_desc,
1876 struct sk_buff *skb)
1877 {
1878 /* Ignore Checksum bit is set OR
1879 * TCP Checksum has not been calculated
1880 */
1881 if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1882 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1883 skb->ip_summed = CHECKSUM_NONE;
1884 return;
1885 }
1886
1887 /* At this point we know the hardware did the TCP checksum */
1888 /* now look at the TCP checksum error bit */
1889 if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1890 /* let the stack verify checksum errors */
1891 skb->ip_summed = CHECKSUM_NONE;
1892 adapter->hw_csum_rx_error++;
1893 } else {
1894 /* TCP checksum is good */
1895 skb->ip_summed = CHECKSUM_UNNECESSARY;
1896 adapter->hw_csum_rx_good++;
1897 }
1898 }
1899
1900 /**
1901 * ixgb_clean_rx_irq - Send received data up the network stack,
1902 * @adapter: board private structure
1903 **/
1904
1905 static bool
1906 #ifdef CONFIG_IXGB_NAPI
1907 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1908 #else
1909 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1910 #endif
1911 {
1912 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1913 struct net_device *netdev = adapter->netdev;
1914 struct pci_dev *pdev = adapter->pdev;
1915 struct ixgb_rx_desc *rx_desc, *next_rxd;
1916 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1917 u32 length;
1918 unsigned int i, j;
1919 bool cleaned = false;
1920
1921 i = rx_ring->next_to_clean;
1922 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1923 buffer_info = &rx_ring->buffer_info[i];
1924
1925 while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1926 struct sk_buff *skb, *next_skb;
1927 u8 status;
1928
1929 #ifdef CONFIG_IXGB_NAPI
1930 if(*work_done >= work_to_do)
1931 break;
1932
1933 (*work_done)++;
1934 #endif
1935 status = rx_desc->status;
1936 skb = buffer_info->skb;
1937 buffer_info->skb = NULL;
1938
1939 prefetch(skb->data);
1940
1941 if(++i == rx_ring->count) i = 0;
1942 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1943 prefetch(next_rxd);
1944
1945 if((j = i + 1) == rx_ring->count) j = 0;
1946 next2_buffer = &rx_ring->buffer_info[j];
1947 prefetch(next2_buffer);
1948
1949 next_buffer = &rx_ring->buffer_info[i];
1950 next_skb = next_buffer->skb;
1951 prefetch(next_skb);
1952
1953 cleaned = true;
1954
1955 pci_unmap_single(pdev,
1956 buffer_info->dma,
1957 buffer_info->length,
1958 PCI_DMA_FROMDEVICE);
1959
1960 length = le16_to_cpu(rx_desc->length);
1961
1962 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1963
1964 /* All receives must fit into a single buffer */
1965
1966 IXGB_DBG("Receive packet consumed multiple buffers "
1967 "length<%x>\n", length);
1968
1969 dev_kfree_skb_irq(skb);
1970 goto rxdesc_done;
1971 }
1972
1973 if (unlikely(rx_desc->errors
1974 & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1975 | IXGB_RX_DESC_ERRORS_P |
1976 IXGB_RX_DESC_ERRORS_RXE))) {
1977
1978 dev_kfree_skb_irq(skb);
1979 goto rxdesc_done;
1980 }
1981
1982 /* code added for copybreak, this should improve
1983 * performance for small packets with large amounts
1984 * of reassembly being done in the stack */
1985 if (length < copybreak) {
1986 struct sk_buff *new_skb =
1987 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1988 if (new_skb) {
1989 skb_reserve(new_skb, NET_IP_ALIGN);
1990 skb_copy_to_linear_data_offset(new_skb,
1991 -NET_IP_ALIGN,
1992 (skb->data -
1993 NET_IP_ALIGN),
1994 (length +
1995 NET_IP_ALIGN));
1996 /* save the skb in buffer_info as good */
1997 buffer_info->skb = skb;
1998 skb = new_skb;
1999 }
2000 }
2001 /* end copybreak code */
2002
2003 /* Good Receive */
2004 skb_put(skb, length);
2005
2006 /* Receive Checksum Offload */
2007 ixgb_rx_checksum(adapter, rx_desc, skb);
2008
2009 skb->protocol = eth_type_trans(skb, netdev);
2010 #ifdef CONFIG_IXGB_NAPI
2011 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2012 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2013 le16_to_cpu(rx_desc->special));
2014 } else {
2015 netif_receive_skb(skb);
2016 }
2017 #else /* CONFIG_IXGB_NAPI */
2018 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2019 vlan_hwaccel_rx(skb, adapter->vlgrp,
2020 le16_to_cpu(rx_desc->special));
2021 } else {
2022 netif_rx(skb);
2023 }
2024 #endif /* CONFIG_IXGB_NAPI */
2025 netdev->last_rx = jiffies;
2026
2027 rxdesc_done:
2028 /* clean up descriptor, might be written over by hw */
2029 rx_desc->status = 0;
2030
2031 /* use prefetched values */
2032 rx_desc = next_rxd;
2033 buffer_info = next_buffer;
2034 }
2035
2036 rx_ring->next_to_clean = i;
2037
2038 ixgb_alloc_rx_buffers(adapter);
2039
2040 return cleaned;
2041 }
2042
2043 /**
2044 * ixgb_alloc_rx_buffers - Replace used receive buffers
2045 * @adapter: address of board private structure
2046 **/
2047
2048 static void
2049 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2050 {
2051 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2052 struct net_device *netdev = adapter->netdev;
2053 struct pci_dev *pdev = adapter->pdev;
2054 struct ixgb_rx_desc *rx_desc;
2055 struct ixgb_buffer *buffer_info;
2056 struct sk_buff *skb;
2057 unsigned int i;
2058 long cleancount;
2059
2060 i = rx_ring->next_to_use;
2061 buffer_info = &rx_ring->buffer_info[i];
2062 cleancount = IXGB_DESC_UNUSED(rx_ring);
2063
2064
2065 /* leave three descriptors unused */
2066 while(--cleancount > 2) {
2067 /* recycle! its good for you */
2068 skb = buffer_info->skb;
2069 if (skb) {
2070 skb_trim(skb, 0);
2071 goto map_skb;
2072 }
2073
2074 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2075 + NET_IP_ALIGN);
2076 if (unlikely(!skb)) {
2077 /* Better luck next round */
2078 adapter->alloc_rx_buff_failed++;
2079 break;
2080 }
2081
2082 /* Make buffer alignment 2 beyond a 16 byte boundary
2083 * this will result in a 16 byte aligned IP header after
2084 * the 14 byte MAC header is removed
2085 */
2086 skb_reserve(skb, NET_IP_ALIGN);
2087
2088 buffer_info->skb = skb;
2089 buffer_info->length = adapter->rx_buffer_len;
2090 map_skb:
2091 buffer_info->dma = pci_map_single(pdev,
2092 skb->data,
2093 adapter->rx_buffer_len,
2094 PCI_DMA_FROMDEVICE);
2095
2096 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2097 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2098 /* guarantee DD bit not set now before h/w gets descriptor
2099 * this is the rest of the workaround for h/w double
2100 * writeback. */
2101 rx_desc->status = 0;
2102
2103
2104 if(++i == rx_ring->count) i = 0;
2105 buffer_info = &rx_ring->buffer_info[i];
2106 }
2107
2108 if (likely(rx_ring->next_to_use != i)) {
2109 rx_ring->next_to_use = i;
2110 if (unlikely(i-- == 0))
2111 i = (rx_ring->count - 1);
2112
2113 /* Force memory writes to complete before letting h/w
2114 * know there are new descriptors to fetch. (Only
2115 * applicable for weak-ordered memory model archs, such
2116 * as IA-64). */
2117 wmb();
2118 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2119 }
2120 }
2121
2122 /**
2123 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2124 *
2125 * @param netdev network interface device structure
2126 * @param grp indicates to enable or disable tagging/stripping
2127 **/
2128 static void
2129 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2130 {
2131 struct ixgb_adapter *adapter = netdev_priv(netdev);
2132 u32 ctrl, rctl;
2133
2134 ixgb_irq_disable(adapter);
2135 adapter->vlgrp = grp;
2136
2137 if(grp) {
2138 /* enable VLAN tag insert/strip */
2139 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140 ctrl |= IXGB_CTRL0_VME;
2141 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142
2143 /* enable VLAN receive filtering */
2144
2145 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2146 rctl |= IXGB_RCTL_VFE;
2147 rctl &= ~IXGB_RCTL_CFIEN;
2148 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2149 } else {
2150 /* disable VLAN tag insert/strip */
2151
2152 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2153 ctrl &= ~IXGB_CTRL0_VME;
2154 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2155
2156 /* disable VLAN filtering */
2157
2158 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2159 rctl &= ~IXGB_RCTL_VFE;
2160 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2161 }
2162
2163 /* don't enable interrupts unless we are UP */
2164 if (adapter->netdev->flags & IFF_UP)
2165 ixgb_irq_enable(adapter);
2166 }
2167
2168 static void
2169 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2170 {
2171 struct ixgb_adapter *adapter = netdev_priv(netdev);
2172 u32 vfta, index;
2173
2174 /* add VID to filter table */
2175
2176 index = (vid >> 5) & 0x7F;
2177 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2178 vfta |= (1 << (vid & 0x1F));
2179 ixgb_write_vfta(&adapter->hw, index, vfta);
2180 }
2181
2182 static void
2183 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2184 {
2185 struct ixgb_adapter *adapter = netdev_priv(netdev);
2186 u32 vfta, index;
2187
2188 ixgb_irq_disable(adapter);
2189
2190 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2191
2192 /* don't enable interrupts unless we are UP */
2193 if (adapter->netdev->flags & IFF_UP)
2194 ixgb_irq_enable(adapter);
2195
2196 /* remove VID from filter table */
2197
2198 index = (vid >> 5) & 0x7F;
2199 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2200 vfta &= ~(1 << (vid & 0x1F));
2201 ixgb_write_vfta(&adapter->hw, index, vfta);
2202 }
2203
2204 static void
2205 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2206 {
2207 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2208
2209 if(adapter->vlgrp) {
2210 u16 vid;
2211 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2212 if(!vlan_group_get_device(adapter->vlgrp, vid))
2213 continue;
2214 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2215 }
2216 }
2217 }
2218
2219 #ifdef CONFIG_NET_POLL_CONTROLLER
2220 /*
2221 * Polling 'interrupt' - used by things like netconsole to send skbs
2222 * without having to re-enable interrupts. It's not called while
2223 * the interrupt routine is executing.
2224 */
2225
2226 static void ixgb_netpoll(struct net_device *dev)
2227 {
2228 struct ixgb_adapter *adapter = netdev_priv(dev);
2229
2230 disable_irq(adapter->pdev->irq);
2231 ixgb_intr(adapter->pdev->irq, dev);
2232 enable_irq(adapter->pdev->irq);
2233 }
2234 #endif
2235
2236 /**
2237 * ixgb_io_error_detected() - called when PCI error is detected
2238 * @pdev pointer to pci device with error
2239 * @state pci channel state after error
2240 *
2241 * This callback is called by the PCI subsystem whenever
2242 * a PCI bus error is detected.
2243 */
2244 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2245 enum pci_channel_state state)
2246 {
2247 struct net_device *netdev = pci_get_drvdata(pdev);
2248 struct ixgb_adapter *adapter = netdev_priv(netdev);
2249
2250 if(netif_running(netdev))
2251 ixgb_down(adapter, true);
2252
2253 pci_disable_device(pdev);
2254
2255 /* Request a slot reset. */
2256 return PCI_ERS_RESULT_NEED_RESET;
2257 }
2258
2259 /**
2260 * ixgb_io_slot_reset - called after the pci bus has been reset.
2261 * @pdev pointer to pci device with error
2262 *
2263 * This callback is called after the PCI buss has been reset.
2264 * Basically, this tries to restart the card from scratch.
2265 * This is a shortened version of the device probe/discovery code,
2266 * it resembles the first-half of the ixgb_probe() routine.
2267 */
2268 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2269 {
2270 struct net_device *netdev = pci_get_drvdata(pdev);
2271 struct ixgb_adapter *adapter = netdev_priv(netdev);
2272
2273 if(pci_enable_device(pdev)) {
2274 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2275 return PCI_ERS_RESULT_DISCONNECT;
2276 }
2277
2278 /* Perform card reset only on one instance of the card */
2279 if (0 != PCI_FUNC (pdev->devfn))
2280 return PCI_ERS_RESULT_RECOVERED;
2281
2282 pci_set_master(pdev);
2283
2284 netif_carrier_off(netdev);
2285 netif_stop_queue(netdev);
2286 ixgb_reset(adapter);
2287
2288 /* Make sure the EEPROM is good */
2289 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2290 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2291 return PCI_ERS_RESULT_DISCONNECT;
2292 }
2293 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2294 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2295
2296 if(!is_valid_ether_addr(netdev->perm_addr)) {
2297 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2298 return PCI_ERS_RESULT_DISCONNECT;
2299 }
2300
2301 return PCI_ERS_RESULT_RECOVERED;
2302 }
2303
2304 /**
2305 * ixgb_io_resume - called when its OK to resume normal operations
2306 * @pdev pointer to pci device with error
2307 *
2308 * The error recovery driver tells us that its OK to resume
2309 * normal operation. Implementation resembles the second-half
2310 * of the ixgb_probe() routine.
2311 */
2312 static void ixgb_io_resume (struct pci_dev *pdev)
2313 {
2314 struct net_device *netdev = pci_get_drvdata(pdev);
2315 struct ixgb_adapter *adapter = netdev_priv(netdev);
2316
2317 pci_set_master(pdev);
2318
2319 if(netif_running(netdev)) {
2320 if(ixgb_up(adapter)) {
2321 printk ("ixgb: can't bring device back up after reset\n");
2322 return;
2323 }
2324 }
2325
2326 netif_device_attach(netdev);
2327 mod_timer(&adapter->watchdog_timer, jiffies);
2328 }
2329
2330 /* ixgb_main.c */
Verdex Pro support