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ixgb: fix link down initial state
[linux-2.6/kvm.git] / drivers / net / ixgb / ixgb_main.c
blobff741ca110f534ffb09cc4698ea3808284b73bbf
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_BIT_MASK(64))) &&
369 !(err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))) {
370 pci_using_dac = 1;
371 } else {
372 if ((err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) ||
373 (err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))) {
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 /* carrier off reporting is important to ethtool even BEFORE open */
475 netif_carrier_off(netdev);
476
477 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
478 ixgb_check_options(adapter);
479 /* reset the hardware with the new settings */
480
481 ixgb_reset(adapter);
482
483 cards_found++;
484 return 0;
485
486 err_register:
487 err_sw_init:
488 err_eeprom:
489 iounmap(adapter->hw.hw_addr);
490 err_ioremap:
491 free_netdev(netdev);
492 err_alloc_etherdev:
493 pci_release_regions(pdev);
494 err_request_regions:
495 err_dma_mask:
496 pci_disable_device(pdev);
497 return err;
498 }
499
500 /**
501 * ixgb_remove - Device Removal Routine
502 * @pdev: PCI device information struct
503 *
504 * ixgb_remove is called by the PCI subsystem to alert the driver
505 * that it should release a PCI device. The could be caused by a
506 * Hot-Plug event, or because the driver is going to be removed from
507 * memory.
508 **/
509
510 static void __devexit
511 ixgb_remove(struct pci_dev *pdev)
512 {
513 struct net_device *netdev = pci_get_drvdata(pdev);
514 struct ixgb_adapter *adapter = netdev_priv(netdev);
515
516 flush_scheduled_work();
517
518 unregister_netdev(netdev);
519
520 iounmap(adapter->hw.hw_addr);
521 pci_release_regions(pdev);
522
523 free_netdev(netdev);
524 }
525
526 /**
527 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
528 * @adapter: board private structure to initialize
529 *
530 * ixgb_sw_init initializes the Adapter private data structure.
531 * Fields are initialized based on PCI device information and
532 * OS network device settings (MTU size).
533 **/
534
535 static int __devinit
536 ixgb_sw_init(struct ixgb_adapter *adapter)
537 {
538 struct ixgb_hw *hw = &adapter->hw;
539 struct net_device *netdev = adapter->netdev;
540 struct pci_dev *pdev = adapter->pdev;
541
542 /* PCI config space info */
543
544 hw->vendor_id = pdev->vendor;
545 hw->device_id = pdev->device;
546 hw->subsystem_vendor_id = pdev->subsystem_vendor;
547 hw->subsystem_id = pdev->subsystem_device;
548
549 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
550 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
551
552 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
553 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
554 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
555 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
556 hw->mac_type = ixgb_82597;
557 else {
558 /* should never have loaded on this device */
559 DPRINTK(PROBE, ERR, "unsupported device id\n");
560 }
561
562 /* enable flow control to be programmed */
563 hw->fc.send_xon = 1;
564
565 set_bit(__IXGB_DOWN, &adapter->flags);
566 return 0;
567 }
568
569 /**
570 * ixgb_open - Called when a network interface is made active
571 * @netdev: network interface device structure
572 *
573 * Returns 0 on success, negative value on failure
574 *
575 * The open entry point is called when a network interface is made
576 * active by the system (IFF_UP). At this point all resources needed
577 * for transmit and receive operations are allocated, the interrupt
578 * handler is registered with the OS, the watchdog timer is started,
579 * and the stack is notified that the interface is ready.
580 **/
581
582 static int
583 ixgb_open(struct net_device *netdev)
584 {
585 struct ixgb_adapter *adapter = netdev_priv(netdev);
586 int err;
587
588 /* allocate transmit descriptors */
589 err = ixgb_setup_tx_resources(adapter);
590 if (err)
591 goto err_setup_tx;
592
593 netif_carrier_off(netdev);
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 netif_start_queue(netdev);
606
607 return 0;
608
609 err_up:
610 ixgb_free_rx_resources(adapter);
611 err_setup_rx:
612 ixgb_free_tx_resources(adapter);
613 err_setup_tx:
614 ixgb_reset(adapter);
615
616 return err;
617 }
618
619 /**
620 * ixgb_close - Disables a network interface
621 * @netdev: network interface device structure
622 *
623 * Returns 0, this is not allowed to fail
624 *
625 * The close entry point is called when an interface is de-activated
626 * by the OS. The hardware is still under the drivers control, but
627 * needs to be disabled. A global MAC reset is issued to stop the
628 * hardware, and all transmit and receive resources are freed.
629 **/
630
631 static int
632 ixgb_close(struct net_device *netdev)
633 {
634 struct ixgb_adapter *adapter = netdev_priv(netdev);
635
636 ixgb_down(adapter, true);
637
638 ixgb_free_tx_resources(adapter);
639 ixgb_free_rx_resources(adapter);
640
641 return 0;
642 }
643
644 /**
645 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
646 * @adapter: board private structure
647 *
648 * Return 0 on success, negative on failure
649 **/
650
651 int
652 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
653 {
654 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
655 struct pci_dev *pdev = adapter->pdev;
656 int size;
657
658 size = sizeof(struct ixgb_buffer) * txdr->count;
659 txdr->buffer_info = vmalloc(size);
660 if (!txdr->buffer_info) {
661 DPRINTK(PROBE, ERR,
662 "Unable to allocate transmit descriptor ring memory\n");
663 return -ENOMEM;
664 }
665 memset(txdr->buffer_info, 0, size);
666
667 /* round up to nearest 4K */
668
669 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
670 txdr->size = ALIGN(txdr->size, 4096);
671
672 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
673 if (!txdr->desc) {
674 vfree(txdr->buffer_info);
675 DPRINTK(PROBE, ERR,
676 "Unable to allocate transmit descriptor memory\n");
677 return -ENOMEM;
678 }
679 memset(txdr->desc, 0, txdr->size);
680
681 txdr->next_to_use = 0;
682 txdr->next_to_clean = 0;
683
684 return 0;
685 }
686
687 /**
688 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
689 * @adapter: board private structure
690 *
691 * Configure the Tx unit of the MAC after a reset.
692 **/
693
694 static void
695 ixgb_configure_tx(struct ixgb_adapter *adapter)
696 {
697 u64 tdba = adapter->tx_ring.dma;
698 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
699 u32 tctl;
700 struct ixgb_hw *hw = &adapter->hw;
701
702 /* Setup the Base and Length of the Tx Descriptor Ring
703 * tx_ring.dma can be either a 32 or 64 bit value
704 */
705
706 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
707 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
708
709 IXGB_WRITE_REG(hw, TDLEN, tdlen);
710
711 /* Setup the HW Tx Head and Tail descriptor pointers */
712
713 IXGB_WRITE_REG(hw, TDH, 0);
714 IXGB_WRITE_REG(hw, TDT, 0);
715
716 /* don't set up txdctl, it induces performance problems if configured
717 * incorrectly */
718 /* Set the Tx Interrupt Delay register */
719
720 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
721
722 /* Program the Transmit Control Register */
723
724 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
725 IXGB_WRITE_REG(hw, TCTL, tctl);
726
727 /* Setup Transmit Descriptor Settings for this adapter */
728 adapter->tx_cmd_type =
729 IXGB_TX_DESC_TYPE |
730 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
731 }
732
733 /**
734 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
735 * @adapter: board private structure
736 *
737 * Returns 0 on success, negative on failure
738 **/
739
740 int
741 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
742 {
743 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
744 struct pci_dev *pdev = adapter->pdev;
745 int size;
746
747 size = sizeof(struct ixgb_buffer) * rxdr->count;
748 rxdr->buffer_info = vmalloc(size);
749 if (!rxdr->buffer_info) {
750 DPRINTK(PROBE, ERR,
751 "Unable to allocate receive descriptor ring\n");
752 return -ENOMEM;
753 }
754 memset(rxdr->buffer_info, 0, size);
755
756 /* Round up to nearest 4K */
757
758 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
759 rxdr->size = ALIGN(rxdr->size, 4096);
760
761 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
762
763 if (!rxdr->desc) {
764 vfree(rxdr->buffer_info);
765 DPRINTK(PROBE, ERR,
766 "Unable to allocate receive descriptors\n");
767 return -ENOMEM;
768 }
769 memset(rxdr->desc, 0, rxdr->size);
770
771 rxdr->next_to_clean = 0;
772 rxdr->next_to_use = 0;
773
774 return 0;
775 }
776
777 /**
778 * ixgb_setup_rctl - configure the receive control register
779 * @adapter: Board private structure
780 **/
781
782 static void
783 ixgb_setup_rctl(struct ixgb_adapter *adapter)
784 {
785 u32 rctl;
786
787 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
788
789 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
790
791 rctl |=
792 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
793 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
794 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
795
796 rctl |= IXGB_RCTL_SECRC;
797
798 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
799 rctl |= IXGB_RCTL_BSIZE_2048;
800 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
801 rctl |= IXGB_RCTL_BSIZE_4096;
802 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
803 rctl |= IXGB_RCTL_BSIZE_8192;
804 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
805 rctl |= IXGB_RCTL_BSIZE_16384;
806
807 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
808 }
809
810 /**
811 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
812 * @adapter: board private structure
813 *
814 * Configure the Rx unit of the MAC after a reset.
815 **/
816
817 static void
818 ixgb_configure_rx(struct ixgb_adapter *adapter)
819 {
820 u64 rdba = adapter->rx_ring.dma;
821 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
822 struct ixgb_hw *hw = &adapter->hw;
823 u32 rctl;
824 u32 rxcsum;
825
826 /* make sure receives are disabled while setting up the descriptors */
827
828 rctl = IXGB_READ_REG(hw, RCTL);
829 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
830
831 /* set the Receive Delay Timer Register */
832
833 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
834
835 /* Setup the Base and Length of the Rx Descriptor Ring */
836
837 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
838 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
839
840 IXGB_WRITE_REG(hw, RDLEN, rdlen);
841
842 /* Setup the HW Rx Head and Tail Descriptor Pointers */
843 IXGB_WRITE_REG(hw, RDH, 0);
844 IXGB_WRITE_REG(hw, RDT, 0);
845
846 /* due to the hardware errata with RXDCTL, we are unable to use any of
847 * the performance enhancing features of it without causing other
848 * subtle bugs, some of the bugs could include receive length
849 * corruption at high data rates (WTHRESH > 0) and/or receive
850 * descriptor ring irregularites (particularly in hardware cache) */
851 IXGB_WRITE_REG(hw, RXDCTL, 0);
852
853 /* Enable Receive Checksum Offload for TCP and UDP */
854 if (adapter->rx_csum) {
855 rxcsum = IXGB_READ_REG(hw, RXCSUM);
856 rxcsum |= IXGB_RXCSUM_TUOFL;
857 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
858 }
859
860 /* Enable Receives */
861
862 IXGB_WRITE_REG(hw, RCTL, rctl);
863 }
864
865 /**
866 * ixgb_free_tx_resources - Free Tx Resources
867 * @adapter: board private structure
868 *
869 * Free all transmit software resources
870 **/
871
872 void
873 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
874 {
875 struct pci_dev *pdev = adapter->pdev;
876
877 ixgb_clean_tx_ring(adapter);
878
879 vfree(adapter->tx_ring.buffer_info);
880 adapter->tx_ring.buffer_info = NULL;
881
882 pci_free_consistent(pdev, adapter->tx_ring.size,
883 adapter->tx_ring.desc, adapter->tx_ring.dma);
884
885 adapter->tx_ring.desc = NULL;
886 }
887
888 static void
889 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
890 struct ixgb_buffer *buffer_info)
891 {
892 buffer_info->dma = 0;
893 if (buffer_info->skb) {
894 skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
895 DMA_TO_DEVICE);
896 dev_kfree_skb_any(buffer_info->skb);
897 buffer_info->skb = NULL;
898 }
899 buffer_info->time_stamp = 0;
900 /* these fields must always be initialized in tx
901 * buffer_info->length = 0;
902 * buffer_info->next_to_watch = 0; */
903 }
904
905 /**
906 * ixgb_clean_tx_ring - Free Tx Buffers
907 * @adapter: board private structure
908 **/
909
910 static void
911 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
912 {
913 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
914 struct ixgb_buffer *buffer_info;
915 unsigned long size;
916 unsigned int i;
917
918 /* Free all the Tx ring sk_buffs */
919
920 for (i = 0; i < tx_ring->count; i++) {
921 buffer_info = &tx_ring->buffer_info[i];
922 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
923 }
924
925 size = sizeof(struct ixgb_buffer) * tx_ring->count;
926 memset(tx_ring->buffer_info, 0, size);
927
928 /* Zero out the descriptor ring */
929
930 memset(tx_ring->desc, 0, tx_ring->size);
931
932 tx_ring->next_to_use = 0;
933 tx_ring->next_to_clean = 0;
934
935 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
936 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
937 }
938
939 /**
940 * ixgb_free_rx_resources - Free Rx Resources
941 * @adapter: board private structure
942 *
943 * Free all receive software resources
944 **/
945
946 void
947 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
948 {
949 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
950 struct pci_dev *pdev = adapter->pdev;
951
952 ixgb_clean_rx_ring(adapter);
953
954 vfree(rx_ring->buffer_info);
955 rx_ring->buffer_info = NULL;
956
957 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
958
959 rx_ring->desc = NULL;
960 }
961
962 /**
963 * ixgb_clean_rx_ring - Free Rx Buffers
964 * @adapter: board private structure
965 **/
966
967 static void
968 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
969 {
970 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
971 struct ixgb_buffer *buffer_info;
972 struct pci_dev *pdev = adapter->pdev;
973 unsigned long size;
974 unsigned int i;
975
976 /* Free all the Rx ring sk_buffs */
977
978 for (i = 0; i < rx_ring->count; i++) {
979 buffer_info = &rx_ring->buffer_info[i];
980 if (buffer_info->dma) {
981 pci_unmap_single(pdev,
982 buffer_info->dma,
983 buffer_info->length,
984 PCI_DMA_FROMDEVICE);
985 buffer_info->dma = 0;
986 buffer_info->length = 0;
987 }
988
989 if (buffer_info->skb) {
990 dev_kfree_skb(buffer_info->skb);
991 buffer_info->skb = NULL;
992 }
993 }
994
995 size = sizeof(struct ixgb_buffer) * rx_ring->count;
996 memset(rx_ring->buffer_info, 0, size);
997
998 /* Zero out the descriptor ring */
999
1000 memset(rx_ring->desc, 0, rx_ring->size);
1001
1002 rx_ring->next_to_clean = 0;
1003 rx_ring->next_to_use = 0;
1004
1005 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1006 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1007 }
1008
1009 /**
1010 * ixgb_set_mac - Change the Ethernet Address of the NIC
1011 * @netdev: network interface device structure
1012 * @p: pointer to an address structure
1013 *
1014 * Returns 0 on success, negative on failure
1015 **/
1016
1017 static int
1018 ixgb_set_mac(struct net_device *netdev, void *p)
1019 {
1020 struct ixgb_adapter *adapter = netdev_priv(netdev);
1021 struct sockaddr *addr = p;
1022
1023 if (!is_valid_ether_addr(addr->sa_data))
1024 return -EADDRNOTAVAIL;
1025
1026 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1027
1028 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1029
1030 return 0;
1031 }
1032
1033 /**
1034 * ixgb_set_multi - Multicast and Promiscuous mode set
1035 * @netdev: network interface device structure
1036 *
1037 * The set_multi entry point is called whenever the multicast address
1038 * list or the network interface flags are updated. This routine is
1039 * responsible for configuring the hardware for proper multicast,
1040 * promiscuous mode, and all-multi behavior.
1041 **/
1042
1043 static void
1044 ixgb_set_multi(struct net_device *netdev)
1045 {
1046 struct ixgb_adapter *adapter = netdev_priv(netdev);
1047 struct ixgb_hw *hw = &adapter->hw;
1048 struct dev_mc_list *mc_ptr;
1049 u32 rctl;
1050 int i;
1051
1052 /* Check for Promiscuous and All Multicast modes */
1053
1054 rctl = IXGB_READ_REG(hw, RCTL);
1055
1056 if (netdev->flags & IFF_PROMISC) {
1057 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1058 rctl &= ~IXGB_RCTL_VFE;
1059 } else {
1060 if (netdev->flags & IFF_ALLMULTI) {
1061 rctl |= IXGB_RCTL_MPE;
1062 rctl &= ~IXGB_RCTL_UPE;
1063 } else {
1064 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1065 }
1066 rctl |= IXGB_RCTL_VFE;
1067 }
1068
1069 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1070 rctl |= IXGB_RCTL_MPE;
1071 IXGB_WRITE_REG(hw, RCTL, rctl);
1072 } else {
1073 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1074 IXGB_ETH_LENGTH_OF_ADDRESS];
1075
1076 IXGB_WRITE_REG(hw, RCTL, rctl);
1077
1078 for (i = 0, mc_ptr = netdev->mc_list;
1079 mc_ptr;
1080 i++, mc_ptr = mc_ptr->next)
1081 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1082 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1083
1084 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1085 }
1086 }
1087
1088 /**
1089 * ixgb_watchdog - Timer Call-back
1090 * @data: pointer to netdev cast into an unsigned long
1091 **/
1092
1093 static void
1094 ixgb_watchdog(unsigned long data)
1095 {
1096 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1097 struct net_device *netdev = adapter->netdev;
1098 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1099
1100 ixgb_check_for_link(&adapter->hw);
1101
1102 if (ixgb_check_for_bad_link(&adapter->hw)) {
1103 /* force the reset path */
1104 netif_stop_queue(netdev);
1105 }
1106
1107 if (adapter->hw.link_up) {
1108 if (!netif_carrier_ok(netdev)) {
1109 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1110 "Full Duplex, Flow Control: %s\n",
1111 netdev->name,
1112 (adapter->hw.fc.type == ixgb_fc_full) ?
1113 "RX/TX" :
1114 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1115 "RX" :
1116 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1117 "TX" : "None")));
1118 adapter->link_speed = 10000;
1119 adapter->link_duplex = FULL_DUPLEX;
1120 netif_carrier_on(netdev);
1121 netif_wake_queue(netdev);
1122 }
1123 } else {
1124 if (netif_carrier_ok(netdev)) {
1125 adapter->link_speed = 0;
1126 adapter->link_duplex = 0;
1127 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1128 netdev->name);
1129 netif_carrier_off(netdev);
1130 netif_stop_queue(netdev);
1131
1132 }
1133 }
1134
1135 ixgb_update_stats(adapter);
1136
1137 if (!netif_carrier_ok(netdev)) {
1138 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1139 /* We've lost link, so the controller stops DMA,
1140 * but we've got queued Tx work that's never going
1141 * to get done, so reset controller to flush Tx.
1142 * (Do the reset outside of interrupt context). */
1143 schedule_work(&adapter->tx_timeout_task);
1144 }
1145 }
1146
1147 /* Force detection of hung controller every watchdog period */
1148 adapter->detect_tx_hung = true;
1149
1150 /* generate an interrupt to force clean up of any stragglers */
1151 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1152
1153 /* Reset the timer */
1154 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1155 }
1156
1157 #define IXGB_TX_FLAGS_CSUM 0x00000001
1158 #define IXGB_TX_FLAGS_VLAN 0x00000002
1159 #define IXGB_TX_FLAGS_TSO 0x00000004
1160
1161 static int
1162 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1163 {
1164 struct ixgb_context_desc *context_desc;
1165 unsigned int i;
1166 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1167 u16 ipcse, tucse, mss;
1168 int err;
1169
1170 if (likely(skb_is_gso(skb))) {
1171 struct ixgb_buffer *buffer_info;
1172 struct iphdr *iph;
1173
1174 if (skb_header_cloned(skb)) {
1175 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1176 if (err)
1177 return err;
1178 }
1179
1180 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1181 mss = skb_shinfo(skb)->gso_size;
1182 iph = ip_hdr(skb);
1183 iph->tot_len = 0;
1184 iph->check = 0;
1185 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1186 iph->daddr, 0,
1187 IPPROTO_TCP, 0);
1188 ipcss = skb_network_offset(skb);
1189 ipcso = (void *)&(iph->check) - (void *)skb->data;
1190 ipcse = skb_transport_offset(skb) - 1;
1191 tucss = skb_transport_offset(skb);
1192 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1193 tucse = 0;
1194
1195 i = adapter->tx_ring.next_to_use;
1196 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1197 buffer_info = &adapter->tx_ring.buffer_info[i];
1198 WARN_ON(buffer_info->dma != 0);
1199
1200 context_desc->ipcss = ipcss;
1201 context_desc->ipcso = ipcso;
1202 context_desc->ipcse = cpu_to_le16(ipcse);
1203 context_desc->tucss = tucss;
1204 context_desc->tucso = tucso;
1205 context_desc->tucse = cpu_to_le16(tucse);
1206 context_desc->mss = cpu_to_le16(mss);
1207 context_desc->hdr_len = hdr_len;
1208 context_desc->status = 0;
1209 context_desc->cmd_type_len = cpu_to_le32(
1210 IXGB_CONTEXT_DESC_TYPE
1211 | IXGB_CONTEXT_DESC_CMD_TSE
1212 | IXGB_CONTEXT_DESC_CMD_IP
1213 | IXGB_CONTEXT_DESC_CMD_TCP
1214 | IXGB_CONTEXT_DESC_CMD_IDE
1215 | (skb->len - (hdr_len)));
1216
1217
1218 if (++i == adapter->tx_ring.count) i = 0;
1219 adapter->tx_ring.next_to_use = i;
1220
1221 return 1;
1222 }
1223
1224 return 0;
1225 }
1226
1227 static bool
1228 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1229 {
1230 struct ixgb_context_desc *context_desc;
1231 unsigned int i;
1232 u8 css, cso;
1233
1234 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1235 struct ixgb_buffer *buffer_info;
1236 css = skb_transport_offset(skb);
1237 cso = css + skb->csum_offset;
1238
1239 i = adapter->tx_ring.next_to_use;
1240 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241 buffer_info = &adapter->tx_ring.buffer_info[i];
1242 WARN_ON(buffer_info->dma != 0);
1243
1244 context_desc->tucss = css;
1245 context_desc->tucso = cso;
1246 context_desc->tucse = 0;
1247 /* zero out any previously existing data in one instruction */
1248 *(u32 *)&(context_desc->ipcss) = 0;
1249 context_desc->status = 0;
1250 context_desc->hdr_len = 0;
1251 context_desc->mss = 0;
1252 context_desc->cmd_type_len =
1253 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1254 | IXGB_TX_DESC_CMD_IDE);
1255
1256 if (++i == adapter->tx_ring.count) i = 0;
1257 adapter->tx_ring.next_to_use = i;
1258
1259 return true;
1260 }
1261
1262 return false;
1263 }
1264
1265 #define IXGB_MAX_TXD_PWR 14
1266 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1267
1268 static int
1269 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1270 unsigned int first)
1271 {
1272 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1273 struct ixgb_buffer *buffer_info;
1274 int len = skb_headlen(skb);
1275 unsigned int offset = 0, size, count = 0, i;
1276 unsigned int mss = skb_shinfo(skb)->gso_size;
1277
1278 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1279 unsigned int f;
1280 dma_addr_t *map;
1281
1282 i = tx_ring->next_to_use;
1283
1284 if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
1285 dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
1286 return 0;
1287 }
1288
1289 map = skb_shinfo(skb)->dma_maps;
1290
1291 while (len) {
1292 buffer_info = &tx_ring->buffer_info[i];
1293 size = min(len, IXGB_MAX_DATA_PER_TXD);
1294 /* Workaround for premature desc write-backs
1295 * in TSO mode. Append 4-byte sentinel desc */
1296 if (unlikely(mss && !nr_frags && size == len && size > 8))
1297 size -= 4;
1298
1299 buffer_info->length = size;
1300 WARN_ON(buffer_info->dma != 0);
1301 buffer_info->time_stamp = jiffies;
1302 buffer_info->dma = map[0] + offset;
1303 pci_map_single(adapter->pdev,
1304 skb->data + offset,
1305 size,
1306 PCI_DMA_TODEVICE);
1307 buffer_info->next_to_watch = 0;
1308
1309 len -= size;
1310 offset += size;
1311 count++;
1312 if (len) {
1313 i++;
1314 if (i == tx_ring->count)
1315 i = 0;
1316 }
1317 }
1318
1319 for (f = 0; f < nr_frags; f++) {
1320 struct skb_frag_struct *frag;
1321
1322 frag = &skb_shinfo(skb)->frags[f];
1323 len = frag->size;
1324 offset = 0;
1325
1326 while (len) {
1327 i++;
1328 if (i == tx_ring->count)
1329 i = 0;
1330
1331 buffer_info = &tx_ring->buffer_info[i];
1332 size = min(len, IXGB_MAX_DATA_PER_TXD);
1333
1334 /* Workaround for premature desc write-backs
1335 * in TSO mode. Append 4-byte sentinel desc */
1336 if (unlikely(mss && (f == (nr_frags - 1))
1337 && size == len && size > 8))
1338 size -= 4;
1339
1340 buffer_info->length = size;
1341 buffer_info->time_stamp = jiffies;
1342 buffer_info->dma = map[f + 1] + offset;
1343 buffer_info->next_to_watch = 0;
1344
1345 len -= size;
1346 offset += size;
1347 count++;
1348 }
1349 }
1350 tx_ring->buffer_info[i].skb = skb;
1351 tx_ring->buffer_info[first].next_to_watch = i;
1352
1353 return count;
1354 }
1355
1356 static void
1357 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1358 {
1359 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1360 struct ixgb_tx_desc *tx_desc = NULL;
1361 struct ixgb_buffer *buffer_info;
1362 u32 cmd_type_len = adapter->tx_cmd_type;
1363 u8 status = 0;
1364 u8 popts = 0;
1365 unsigned int i;
1366
1367 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1368 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1369 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1370 }
1371
1372 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1373 popts |= IXGB_TX_DESC_POPTS_TXSM;
1374
1375 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1376 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1377
1378 i = tx_ring->next_to_use;
1379
1380 while (count--) {
1381 buffer_info = &tx_ring->buffer_info[i];
1382 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1383 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1384 tx_desc->cmd_type_len =
1385 cpu_to_le32(cmd_type_len | buffer_info->length);
1386 tx_desc->status = status;
1387 tx_desc->popts = popts;
1388 tx_desc->vlan = cpu_to_le16(vlan_id);
1389
1390 if (++i == tx_ring->count) i = 0;
1391 }
1392
1393 tx_desc->cmd_type_len |=
1394 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1395
1396 /* Force memory writes to complete before letting h/w
1397 * know there are new descriptors to fetch. (Only
1398 * applicable for weak-ordered memory model archs,
1399 * such as IA-64). */
1400 wmb();
1401
1402 tx_ring->next_to_use = i;
1403 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1404 }
1405
1406 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1407 {
1408 struct ixgb_adapter *adapter = netdev_priv(netdev);
1409 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1410
1411 netif_stop_queue(netdev);
1412 /* Herbert's original patch had:
1413 * smp_mb__after_netif_stop_queue();
1414 * but since that doesn't exist yet, just open code it. */
1415 smp_mb();
1416
1417 /* We need to check again in a case another CPU has just
1418 * made room available. */
1419 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1420 return -EBUSY;
1421
1422 /* A reprieve! */
1423 netif_start_queue(netdev);
1424 ++adapter->restart_queue;
1425 return 0;
1426 }
1427
1428 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1429 struct ixgb_desc_ring *tx_ring, int size)
1430 {
1431 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1432 return 0;
1433 return __ixgb_maybe_stop_tx(netdev, size);
1434 }
1435
1436
1437 /* Tx Descriptors needed, worst case */
1438 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1439 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1440 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1441 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1442 + 1 /* one more needed for sentinel TSO workaround */
1443
1444 static int
1445 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1446 {
1447 struct ixgb_adapter *adapter = netdev_priv(netdev);
1448 unsigned int first;
1449 unsigned int tx_flags = 0;
1450 int vlan_id = 0;
1451 int count = 0;
1452 int tso;
1453
1454 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1455 dev_kfree_skb(skb);
1456 return NETDEV_TX_OK;
1457 }
1458
1459 if (skb->len <= 0) {
1460 dev_kfree_skb(skb);
1461 return 0;
1462 }
1463
1464 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1465 DESC_NEEDED)))
1466 return NETDEV_TX_BUSY;
1467
1468 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1469 tx_flags |= IXGB_TX_FLAGS_VLAN;
1470 vlan_id = vlan_tx_tag_get(skb);
1471 }
1472
1473 first = adapter->tx_ring.next_to_use;
1474
1475 tso = ixgb_tso(adapter, skb);
1476 if (tso < 0) {
1477 dev_kfree_skb(skb);
1478 return NETDEV_TX_OK;
1479 }
1480
1481 if (likely(tso))
1482 tx_flags |= IXGB_TX_FLAGS_TSO;
1483 else if (ixgb_tx_csum(adapter, skb))
1484 tx_flags |= IXGB_TX_FLAGS_CSUM;
1485
1486 count = ixgb_tx_map(adapter, skb, first);
1487
1488 if (count) {
1489 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1490 netdev->trans_start = jiffies;
1491 /* Make sure there is space in the ring for the next send. */
1492 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1493
1494 } else {
1495 dev_kfree_skb_any(skb);
1496 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1497 adapter->tx_ring.next_to_use = first;
1498 }
1499
1500 return NETDEV_TX_OK;
1501 }
1502
1503 /**
1504 * ixgb_tx_timeout - Respond to a Tx Hang
1505 * @netdev: network interface device structure
1506 **/
1507
1508 static void
1509 ixgb_tx_timeout(struct net_device *netdev)
1510 {
1511 struct ixgb_adapter *adapter = netdev_priv(netdev);
1512
1513 /* Do the reset outside of interrupt context */
1514 schedule_work(&adapter->tx_timeout_task);
1515 }
1516
1517 static void
1518 ixgb_tx_timeout_task(struct work_struct *work)
1519 {
1520 struct ixgb_adapter *adapter =
1521 container_of(work, struct ixgb_adapter, tx_timeout_task);
1522
1523 adapter->tx_timeout_count++;
1524 ixgb_down(adapter, true);
1525 ixgb_up(adapter);
1526 }
1527
1528 /**
1529 * ixgb_get_stats - Get System Network Statistics
1530 * @netdev: network interface device structure
1531 *
1532 * Returns the address of the device statistics structure.
1533 * The statistics are actually updated from the timer callback.
1534 **/
1535
1536 static struct net_device_stats *
1537 ixgb_get_stats(struct net_device *netdev)
1538 {
1539 struct ixgb_adapter *adapter = netdev_priv(netdev);
1540
1541 return &adapter->net_stats;
1542 }
1543
1544 /**
1545 * ixgb_change_mtu - Change the Maximum Transfer Unit
1546 * @netdev: network interface device structure
1547 * @new_mtu: new value for maximum frame size
1548 *
1549 * Returns 0 on success, negative on failure
1550 **/
1551
1552 static int
1553 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1554 {
1555 struct ixgb_adapter *adapter = netdev_priv(netdev);
1556 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1557 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1558
1559 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1560 if ((new_mtu < 68) ||
1561 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1562 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1563 return -EINVAL;
1564 }
1565
1566 if (old_max_frame == max_frame)
1567 return 0;
1568
1569 if (netif_running(netdev))
1570 ixgb_down(adapter, true);
1571
1572 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1573
1574 netdev->mtu = new_mtu;
1575
1576 if (netif_running(netdev))
1577 ixgb_up(adapter);
1578
1579 return 0;
1580 }
1581
1582 /**
1583 * ixgb_update_stats - Update the board statistics counters.
1584 * @adapter: board private structure
1585 **/
1586
1587 void
1588 ixgb_update_stats(struct ixgb_adapter *adapter)
1589 {
1590 struct net_device *netdev = adapter->netdev;
1591 struct pci_dev *pdev = adapter->pdev;
1592
1593 /* Prevent stats update while adapter is being reset */
1594 if (pci_channel_offline(pdev))
1595 return;
1596
1597 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1598 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1599 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1600 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1601 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1602 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1603
1604 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1605 /* fix up multicast stats by removing broadcasts */
1606 if (multi >= bcast)
1607 multi -= bcast;
1608
1609 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1610 adapter->stats.mprch += (multi >> 32);
1611 adapter->stats.bprcl += bcast_l;
1612 adapter->stats.bprch += bcast_h;
1613 } else {
1614 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1615 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1616 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1617 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1618 }
1619 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1620 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1621 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1622 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1623 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1624 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1625 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1626 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1627 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1628 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1629 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1630 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1631 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1632 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1633 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1634 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1635 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1636 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1637 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1638 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1639 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1640 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1641 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1642 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1643 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1644 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1645 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1646 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1647 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1648 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1649 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1650 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1651 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1652 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1653 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1654 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1655 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1656 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1657 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1658 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1659 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1660 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1661 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1662 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1663 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1664 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1665 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1666 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1667 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1668 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1669 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1670 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1671 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1672 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1673 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1674 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1675
1676 /* Fill out the OS statistics structure */
1677
1678 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1679 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1680 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1681 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1682 adapter->net_stats.multicast = adapter->stats.mprcl;
1683 adapter->net_stats.collisions = 0;
1684
1685 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1686 * with a length in the type/len field */
1687 adapter->net_stats.rx_errors =
1688 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1689 adapter->stats.ruc +
1690 adapter->stats.roc /*+ adapter->stats.rlec */ +
1691 adapter->stats.icbc +
1692 adapter->stats.ecbc + adapter->stats.mpc;
1693
1694 /* see above
1695 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1696 */
1697
1698 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1699 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1700 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1701 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1702
1703 adapter->net_stats.tx_errors = 0;
1704 adapter->net_stats.rx_frame_errors = 0;
1705 adapter->net_stats.tx_aborted_errors = 0;
1706 adapter->net_stats.tx_carrier_errors = 0;
1707 adapter->net_stats.tx_fifo_errors = 0;
1708 adapter->net_stats.tx_heartbeat_errors = 0;
1709 adapter->net_stats.tx_window_errors = 0;
1710 }
1711
1712 #define IXGB_MAX_INTR 10
1713 /**
1714 * ixgb_intr - Interrupt Handler
1715 * @irq: interrupt number
1716 * @data: pointer to a network interface device structure
1717 **/
1718
1719 static irqreturn_t
1720 ixgb_intr(int irq, void *data)
1721 {
1722 struct net_device *netdev = data;
1723 struct ixgb_adapter *adapter = netdev_priv(netdev);
1724 struct ixgb_hw *hw = &adapter->hw;
1725 u32 icr = IXGB_READ_REG(hw, ICR);
1726
1727 if (unlikely(!icr))
1728 return IRQ_NONE; /* Not our interrupt */
1729
1730 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1731 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1732 mod_timer(&adapter->watchdog_timer, jiffies);
1733
1734 if (napi_schedule_prep(&adapter->napi)) {
1735
1736 /* Disable interrupts and register for poll. The flush
1737 of the posted write is intentionally left out.
1738 */
1739
1740 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1741 __napi_schedule(&adapter->napi);
1742 }
1743 return IRQ_HANDLED;
1744 }
1745
1746 /**
1747 * ixgb_clean - NAPI Rx polling callback
1748 * @adapter: board private structure
1749 **/
1750
1751 static int
1752 ixgb_clean(struct napi_struct *napi, int budget)
1753 {
1754 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1755 int work_done = 0;
1756
1757 ixgb_clean_tx_irq(adapter);
1758 ixgb_clean_rx_irq(adapter, &work_done, budget);
1759
1760 /* If budget not fully consumed, exit the polling mode */
1761 if (work_done < budget) {
1762 napi_complete(napi);
1763 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1764 ixgb_irq_enable(adapter);
1765 }
1766
1767 return work_done;
1768 }
1769
1770 /**
1771 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1772 * @adapter: board private structure
1773 **/
1774
1775 static bool
1776 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1777 {
1778 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1779 struct net_device *netdev = adapter->netdev;
1780 struct ixgb_tx_desc *tx_desc, *eop_desc;
1781 struct ixgb_buffer *buffer_info;
1782 unsigned int i, eop;
1783 bool cleaned = false;
1784
1785 i = tx_ring->next_to_clean;
1786 eop = tx_ring->buffer_info[i].next_to_watch;
1787 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1788
1789 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1790
1791 for (cleaned = false; !cleaned; ) {
1792 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1793 buffer_info = &tx_ring->buffer_info[i];
1794
1795 if (tx_desc->popts &
1796 (IXGB_TX_DESC_POPTS_TXSM |
1797 IXGB_TX_DESC_POPTS_IXSM))
1798 adapter->hw_csum_tx_good++;
1799
1800 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1801
1802 *(u32 *)&(tx_desc->status) = 0;
1803
1804 cleaned = (i == eop);
1805 if (++i == tx_ring->count) i = 0;
1806 }
1807
1808 eop = tx_ring->buffer_info[i].next_to_watch;
1809 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1810 }
1811
1812 tx_ring->next_to_clean = i;
1813
1814 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1815 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1816 /* Make sure that anybody stopping the queue after this
1817 * sees the new next_to_clean. */
1818 smp_mb();
1819
1820 if (netif_queue_stopped(netdev) &&
1821 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1822 netif_wake_queue(netdev);
1823 ++adapter->restart_queue;
1824 }
1825 }
1826
1827 if (adapter->detect_tx_hung) {
1828 /* detect a transmit hang in hardware, this serializes the
1829 * check with the clearing of time_stamp and movement of i */
1830 adapter->detect_tx_hung = false;
1831 if (tx_ring->buffer_info[eop].time_stamp &&
1832 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1833 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1834 IXGB_STATUS_TXOFF)) {
1835 /* detected Tx unit hang */
1836 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1837 " TDH <%x>\n"
1838 " TDT <%x>\n"
1839 " next_to_use <%x>\n"
1840 " next_to_clean <%x>\n"
1841 "buffer_info[next_to_clean]\n"
1842 " time_stamp <%lx>\n"
1843 " next_to_watch <%x>\n"
1844 " jiffies <%lx>\n"
1845 " next_to_watch.status <%x>\n",
1846 IXGB_READ_REG(&adapter->hw, TDH),
1847 IXGB_READ_REG(&adapter->hw, TDT),
1848 tx_ring->next_to_use,
1849 tx_ring->next_to_clean,
1850 tx_ring->buffer_info[eop].time_stamp,
1851 eop,
1852 jiffies,
1853 eop_desc->status);
1854 netif_stop_queue(netdev);
1855 }
1856 }
1857
1858 return cleaned;
1859 }
1860
1861 /**
1862 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1863 * @adapter: board private structure
1864 * @rx_desc: receive descriptor
1865 * @sk_buff: socket buffer with received data
1866 **/
1867
1868 static void
1869 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1870 struct ixgb_rx_desc *rx_desc,
1871 struct sk_buff *skb)
1872 {
1873 /* Ignore Checksum bit is set OR
1874 * TCP Checksum has not been calculated
1875 */
1876 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1877 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1878 skb->ip_summed = CHECKSUM_NONE;
1879 return;
1880 }
1881
1882 /* At this point we know the hardware did the TCP checksum */
1883 /* now look at the TCP checksum error bit */
1884 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1885 /* let the stack verify checksum errors */
1886 skb->ip_summed = CHECKSUM_NONE;
1887 adapter->hw_csum_rx_error++;
1888 } else {
1889 /* TCP checksum is good */
1890 skb->ip_summed = CHECKSUM_UNNECESSARY;
1891 adapter->hw_csum_rx_good++;
1892 }
1893 }
1894
1895 /**
1896 * ixgb_clean_rx_irq - Send received data up the network stack,
1897 * @adapter: board private structure
1898 **/
1899
1900 static bool
1901 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1902 {
1903 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1904 struct net_device *netdev = adapter->netdev;
1905 struct pci_dev *pdev = adapter->pdev;
1906 struct ixgb_rx_desc *rx_desc, *next_rxd;
1907 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1908 u32 length;
1909 unsigned int i, j;
1910 int cleaned_count = 0;
1911 bool cleaned = false;
1912
1913 i = rx_ring->next_to_clean;
1914 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1915 buffer_info = &rx_ring->buffer_info[i];
1916
1917 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1918 struct sk_buff *skb;
1919 u8 status;
1920
1921 if (*work_done >= work_to_do)
1922 break;
1923
1924 (*work_done)++;
1925 status = rx_desc->status;
1926 skb = buffer_info->skb;
1927 buffer_info->skb = NULL;
1928
1929 prefetch(skb->data - NET_IP_ALIGN);
1930
1931 if (++i == rx_ring->count) i = 0;
1932 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1933 prefetch(next_rxd);
1934
1935 if ((j = i + 1) == rx_ring->count) j = 0;
1936 next2_buffer = &rx_ring->buffer_info[j];
1937 prefetch(next2_buffer);
1938
1939 next_buffer = &rx_ring->buffer_info[i];
1940
1941 cleaned = true;
1942 cleaned_count++;
1943
1944 pci_unmap_single(pdev,
1945 buffer_info->dma,
1946 buffer_info->length,
1947 PCI_DMA_FROMDEVICE);
1948 buffer_info->dma = 0;
1949
1950 length = le16_to_cpu(rx_desc->length);
1951 rx_desc->length = 0;
1952
1953 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1954
1955 /* All receives must fit into a single buffer */
1956
1957 IXGB_DBG("Receive packet consumed multiple buffers "
1958 "length<%x>\n", length);
1959
1960 dev_kfree_skb_irq(skb);
1961 goto rxdesc_done;
1962 }
1963
1964 if (unlikely(rx_desc->errors &
1965 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1966 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1967 dev_kfree_skb_irq(skb);
1968 goto rxdesc_done;
1969 }
1970
1971 /* code added for copybreak, this should improve
1972 * performance for small packets with large amounts
1973 * of reassembly being done in the stack */
1974 if (length < copybreak) {
1975 struct sk_buff *new_skb =
1976 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1977 if (new_skb) {
1978 skb_reserve(new_skb, NET_IP_ALIGN);
1979 skb_copy_to_linear_data_offset(new_skb,
1980 -NET_IP_ALIGN,
1981 (skb->data -
1982 NET_IP_ALIGN),
1983 (length +
1984 NET_IP_ALIGN));
1985 /* save the skb in buffer_info as good */
1986 buffer_info->skb = skb;
1987 skb = new_skb;
1988 }
1989 }
1990 /* end copybreak code */
1991
1992 /* Good Receive */
1993 skb_put(skb, length);
1994
1995 /* Receive Checksum Offload */
1996 ixgb_rx_checksum(adapter, rx_desc, skb);
1997
1998 skb->protocol = eth_type_trans(skb, netdev);
1999 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2000 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2001 le16_to_cpu(rx_desc->special));
2002 } else {
2003 netif_receive_skb(skb);
2004 }
2005
2006 rxdesc_done:
2007 /* clean up descriptor, might be written over by hw */
2008 rx_desc->status = 0;
2009
2010 /* return some buffers to hardware, one at a time is too slow */
2011 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2012 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2013 cleaned_count = 0;
2014 }
2015
2016 /* use prefetched values */
2017 rx_desc = next_rxd;
2018 buffer_info = next_buffer;
2019 }
2020
2021 rx_ring->next_to_clean = i;
2022
2023 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2024 if (cleaned_count)
2025 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2026
2027 return cleaned;
2028 }
2029
2030 /**
2031 * ixgb_alloc_rx_buffers - Replace used receive buffers
2032 * @adapter: address of board private structure
2033 **/
2034
2035 static void
2036 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2037 {
2038 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2039 struct net_device *netdev = adapter->netdev;
2040 struct pci_dev *pdev = adapter->pdev;
2041 struct ixgb_rx_desc *rx_desc;
2042 struct ixgb_buffer *buffer_info;
2043 struct sk_buff *skb;
2044 unsigned int i;
2045 long cleancount;
2046
2047 i = rx_ring->next_to_use;
2048 buffer_info = &rx_ring->buffer_info[i];
2049 cleancount = IXGB_DESC_UNUSED(rx_ring);
2050
2051
2052 /* leave three descriptors unused */
2053 while (--cleancount > 2 && cleaned_count--) {
2054 /* recycle! its good for you */
2055 skb = buffer_info->skb;
2056 if (skb) {
2057 skb_trim(skb, 0);
2058 goto map_skb;
2059 }
2060
2061 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2062 + NET_IP_ALIGN);
2063 if (unlikely(!skb)) {
2064 /* Better luck next round */
2065 adapter->alloc_rx_buff_failed++;
2066 break;
2067 }
2068
2069 /* Make buffer alignment 2 beyond a 16 byte boundary
2070 * this will result in a 16 byte aligned IP header after
2071 * the 14 byte MAC header is removed
2072 */
2073 skb_reserve(skb, NET_IP_ALIGN);
2074
2075 buffer_info->skb = skb;
2076 buffer_info->length = adapter->rx_buffer_len;
2077 map_skb:
2078 buffer_info->dma = pci_map_single(pdev,
2079 skb->data,
2080 adapter->rx_buffer_len,
2081 PCI_DMA_FROMDEVICE);
2082
2083 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2084 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2085 /* guarantee DD bit not set now before h/w gets descriptor
2086 * this is the rest of the workaround for h/w double
2087 * writeback. */
2088 rx_desc->status = 0;
2089
2090
2091 if (++i == rx_ring->count) i = 0;
2092 buffer_info = &rx_ring->buffer_info[i];
2093 }
2094
2095 if (likely(rx_ring->next_to_use != i)) {
2096 rx_ring->next_to_use = i;
2097 if (unlikely(i-- == 0))
2098 i = (rx_ring->count - 1);
2099
2100 /* Force memory writes to complete before letting h/w
2101 * know there are new descriptors to fetch. (Only
2102 * applicable for weak-ordered memory model archs, such
2103 * as IA-64). */
2104 wmb();
2105 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2106 }
2107 }
2108
2109 /**
2110 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2111 *
2112 * @param netdev network interface device structure
2113 * @param grp indicates to enable or disable tagging/stripping
2114 **/
2115 static void
2116 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2117 {
2118 struct ixgb_adapter *adapter = netdev_priv(netdev);
2119 u32 ctrl, rctl;
2120
2121 ixgb_irq_disable(adapter);
2122 adapter->vlgrp = grp;
2123
2124 if (grp) {
2125 /* enable VLAN tag insert/strip */
2126 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2127 ctrl |= IXGB_CTRL0_VME;
2128 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2129
2130 /* enable VLAN receive filtering */
2131
2132 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2133 rctl &= ~IXGB_RCTL_CFIEN;
2134 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2135 } else {
2136 /* disable VLAN tag insert/strip */
2137
2138 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2139 ctrl &= ~IXGB_CTRL0_VME;
2140 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2141 }
2142
2143 /* don't enable interrupts unless we are UP */
2144 if (adapter->netdev->flags & IFF_UP)
2145 ixgb_irq_enable(adapter);
2146 }
2147
2148 static void
2149 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2150 {
2151 struct ixgb_adapter *adapter = netdev_priv(netdev);
2152 u32 vfta, index;
2153
2154 /* add VID to filter table */
2155
2156 index = (vid >> 5) & 0x7F;
2157 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2158 vfta |= (1 << (vid & 0x1F));
2159 ixgb_write_vfta(&adapter->hw, index, vfta);
2160 }
2161
2162 static void
2163 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2164 {
2165 struct ixgb_adapter *adapter = netdev_priv(netdev);
2166 u32 vfta, index;
2167
2168 ixgb_irq_disable(adapter);
2169
2170 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2171
2172 /* don't enable interrupts unless we are UP */
2173 if (adapter->netdev->flags & IFF_UP)
2174 ixgb_irq_enable(adapter);
2175
2176 /* remove VID from filter table */
2177
2178 index = (vid >> 5) & 0x7F;
2179 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2180 vfta &= ~(1 << (vid & 0x1F));
2181 ixgb_write_vfta(&adapter->hw, index, vfta);
2182 }
2183
2184 static void
2185 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2186 {
2187 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2188
2189 if (adapter->vlgrp) {
2190 u16 vid;
2191 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2192 if (!vlan_group_get_device(adapter->vlgrp, vid))
2193 continue;
2194 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2195 }
2196 }
2197 }
2198
2199 #ifdef CONFIG_NET_POLL_CONTROLLER
2200 /*
2201 * Polling 'interrupt' - used by things like netconsole to send skbs
2202 * without having to re-enable interrupts. It's not called while
2203 * the interrupt routine is executing.
2204 */
2205
2206 static void ixgb_netpoll(struct net_device *dev)
2207 {
2208 struct ixgb_adapter *adapter = netdev_priv(dev);
2209
2210 disable_irq(adapter->pdev->irq);
2211 ixgb_intr(adapter->pdev->irq, dev);
2212 enable_irq(adapter->pdev->irq);
2213 }
2214 #endif
2215
2216 /**
2217 * ixgb_io_error_detected() - called when PCI error is detected
2218 * @pdev pointer to pci device with error
2219 * @state pci channel state after error
2220 *
2221 * This callback is called by the PCI subsystem whenever
2222 * a PCI bus error is detected.
2223 */
2224 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2225 enum pci_channel_state state)
2226 {
2227 struct net_device *netdev = pci_get_drvdata(pdev);
2228 struct ixgb_adapter *adapter = netdev_priv(netdev);
2229
2230 if (netif_running(netdev))
2231 ixgb_down(adapter, true);
2232
2233 pci_disable_device(pdev);
2234
2235 /* Request a slot reset. */
2236 return PCI_ERS_RESULT_NEED_RESET;
2237 }
2238
2239 /**
2240 * ixgb_io_slot_reset - called after the pci bus has been reset.
2241 * @pdev pointer to pci device with error
2242 *
2243 * This callback is called after the PCI bus has been reset.
2244 * Basically, this tries to restart the card from scratch.
2245 * This is a shortened version of the device probe/discovery code,
2246 * it resembles the first-half of the ixgb_probe() routine.
2247 */
2248 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2249 {
2250 struct net_device *netdev = pci_get_drvdata(pdev);
2251 struct ixgb_adapter *adapter = netdev_priv(netdev);
2252
2253 if (pci_enable_device(pdev)) {
2254 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2255 return PCI_ERS_RESULT_DISCONNECT;
2256 }
2257
2258 /* Perform card reset only on one instance of the card */
2259 if (0 != PCI_FUNC (pdev->devfn))
2260 return PCI_ERS_RESULT_RECOVERED;
2261
2262 pci_set_master(pdev);
2263
2264 netif_carrier_off(netdev);
2265 netif_stop_queue(netdev);
2266 ixgb_reset(adapter);
2267
2268 /* Make sure the EEPROM is good */
2269 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2270 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2271 return PCI_ERS_RESULT_DISCONNECT;
2272 }
2273 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2274 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2275
2276 if (!is_valid_ether_addr(netdev->perm_addr)) {
2277 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2278 return PCI_ERS_RESULT_DISCONNECT;
2279 }
2280
2281 return PCI_ERS_RESULT_RECOVERED;
2282 }
2283
2284 /**
2285 * ixgb_io_resume - called when its OK to resume normal operations
2286 * @pdev pointer to pci device with error
2287 *
2288 * The error recovery driver tells us that its OK to resume
2289 * normal operation. Implementation resembles the second-half
2290 * of the ixgb_probe() routine.
2291 */
2292 static void ixgb_io_resume(struct pci_dev *pdev)
2293 {
2294 struct net_device *netdev = pci_get_drvdata(pdev);
2295 struct ixgb_adapter *adapter = netdev_priv(netdev);
2296
2297 pci_set_master(pdev);
2298
2299 if (netif_running(netdev)) {
2300 if (ixgb_up(adapter)) {
2301 printk ("ixgb: can't bring device back up after reset\n");
2302 return;
2303 }
2304 }
2305
2306 netif_device_attach(netdev);
2307 mod_timer(&adapter->watchdog_timer, jiffies);
2308 }
2309
2310 /* ixgb_main.c */
kernel-based virtual machine