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[deliverable/linux.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2008 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #define DRIVERNAPI "-NAPI"
35 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
36 const char ixgb_driver_version[] = DRV_VERSION;
37 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
38
39 #define IXGB_CB_LENGTH 256
40 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
41 module_param(copybreak, uint, 0644);
42 MODULE_PARM_DESC(copybreak,
43 "Maximum size of packet that is copied to a new buffer on receive");
44
45 /* ixgb_pci_tbl - PCI Device ID Table
46 *
47 * Wildcard entries (PCI_ANY_ID) should come last
48 * Last entry must be all 0s
49 *
50 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
51 * Class, Class Mask, private data (not used) }
52 */
53 static struct pci_device_id ixgb_pci_tbl[] = {
54 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
55 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62
63 /* required last entry */
64 {0,}
65 };
66
67 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
68
69 /* Local Function Prototypes */
70 static int ixgb_init_module(void);
71 static void ixgb_exit_module(void);
72 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
73 static void __devexit ixgb_remove(struct pci_dev *pdev);
74 static int ixgb_sw_init(struct ixgb_adapter *adapter);
75 static int ixgb_open(struct net_device *netdev);
76 static int ixgb_close(struct net_device *netdev);
77 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
78 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
79 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
80 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
81 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
82 static void ixgb_set_multi(struct net_device *netdev);
83 static void ixgb_watchdog(unsigned long data);
84 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
85 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
86 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
87 static int ixgb_set_mac(struct net_device *netdev, void *p);
88 static irqreturn_t ixgb_intr(int irq, void *data);
89 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
90
91 static int ixgb_clean(struct napi_struct *, int);
92 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
93 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
94
95 static void ixgb_tx_timeout(struct net_device *dev);
96 static void ixgb_tx_timeout_task(struct work_struct *work);
97
98 static void ixgb_vlan_rx_register(struct net_device *netdev,
99 struct vlan_group *grp);
100 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
101 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
102 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
103
104 #ifdef CONFIG_NET_POLL_CONTROLLER
105 /* for netdump / net console */
106 static void ixgb_netpoll(struct net_device *dev);
107 #endif
108
109 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
110 enum pci_channel_state state);
111 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
112 static void ixgb_io_resume (struct pci_dev *pdev);
113
114 static struct pci_error_handlers ixgb_err_handler = {
115 .error_detected = ixgb_io_error_detected,
116 .slot_reset = ixgb_io_slot_reset,
117 .resume = ixgb_io_resume,
118 };
119
120 static struct pci_driver ixgb_driver = {
121 .name = ixgb_driver_name,
122 .id_table = ixgb_pci_tbl,
123 .probe = ixgb_probe,
124 .remove = __devexit_p(ixgb_remove),
125 .err_handler = &ixgb_err_handler
126 };
127
128 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
129 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
130 MODULE_LICENSE("GPL");
131 MODULE_VERSION(DRV_VERSION);
132
133 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
134 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
135 module_param(debug, int, 0);
136 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
137
138 /**
139 * ixgb_init_module - Driver Registration Routine
140 *
141 * ixgb_init_module is the first routine called when the driver is
142 * loaded. All it does is register with the PCI subsystem.
143 **/
144
145 static int __init
146 ixgb_init_module(void)
147 {
148 printk(KERN_INFO "%s - version %s\n",
149 ixgb_driver_string, ixgb_driver_version);
150
151 printk(KERN_INFO "%s\n", ixgb_copyright);
152
153 return pci_register_driver(&ixgb_driver);
154 }
155
156 module_init(ixgb_init_module);
157
158 /**
159 * ixgb_exit_module - Driver Exit Cleanup Routine
160 *
161 * ixgb_exit_module is called just before the driver is removed
162 * from memory.
163 **/
164
165 static void __exit
166 ixgb_exit_module(void)
167 {
168 pci_unregister_driver(&ixgb_driver);
169 }
170
171 module_exit(ixgb_exit_module);
172
173 /**
174 * ixgb_irq_disable - Mask off interrupt generation on the NIC
175 * @adapter: board private structure
176 **/
177
178 static void
179 ixgb_irq_disable(struct ixgb_adapter *adapter)
180 {
181 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
182 IXGB_WRITE_FLUSH(&adapter->hw);
183 synchronize_irq(adapter->pdev->irq);
184 }
185
186 /**
187 * ixgb_irq_enable - Enable default interrupt generation settings
188 * @adapter: board private structure
189 **/
190
191 static void
192 ixgb_irq_enable(struct ixgb_adapter *adapter)
193 {
194 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
195 IXGB_INT_TXDW | IXGB_INT_LSC;
196 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
197 val |= IXGB_INT_GPI0;
198 IXGB_WRITE_REG(&adapter->hw, IMS, val);
199 IXGB_WRITE_FLUSH(&adapter->hw);
200 }
201
202 int
203 ixgb_up(struct ixgb_adapter *adapter)
204 {
205 struct net_device *netdev = adapter->netdev;
206 int err, irq_flags = IRQF_SHARED;
207 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
208 struct ixgb_hw *hw = &adapter->hw;
209
210 /* hardware has been reset, we need to reload some things */
211
212 ixgb_rar_set(hw, netdev->dev_addr, 0);
213 ixgb_set_multi(netdev);
214
215 ixgb_restore_vlan(adapter);
216
217 ixgb_configure_tx(adapter);
218 ixgb_setup_rctl(adapter);
219 ixgb_configure_rx(adapter);
220 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
221
222 /* disable interrupts and get the hardware into a known state */
223 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
224
225 /* only enable MSI if bus is in PCI-X mode */
226 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
227 err = pci_enable_msi(adapter->pdev);
228 if (!err) {
229 adapter->have_msi = 1;
230 irq_flags = 0;
231 }
232 /* proceed to try to request regular interrupt */
233 }
234
235 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
236 netdev->name, netdev);
237 if (err) {
238 if (adapter->have_msi)
239 pci_disable_msi(adapter->pdev);
240 DPRINTK(PROBE, ERR,
241 "Unable to allocate interrupt Error: %d\n", err);
242 return err;
243 }
244
245 if ((hw->max_frame_size != max_frame) ||
246 (hw->max_frame_size !=
247 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
248
249 hw->max_frame_size = max_frame;
250
251 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
252
253 if (hw->max_frame_size >
254 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
255 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
256
257 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
258 ctrl0 |= IXGB_CTRL0_JFE;
259 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
260 }
261 }
262 }
263
264 clear_bit(__IXGB_DOWN, &adapter->flags);
265
266 napi_enable(&adapter->napi);
267 ixgb_irq_enable(adapter);
268
269 mod_timer(&adapter->watchdog_timer, jiffies);
270
271 return 0;
272 }
273
274 void
275 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
276 {
277 struct net_device *netdev = adapter->netdev;
278
279 /* prevent the interrupt handler from restarting watchdog */
280 set_bit(__IXGB_DOWN, &adapter->flags);
281
282 napi_disable(&adapter->napi);
283 /* waiting for NAPI to complete can re-enable interrupts */
284 ixgb_irq_disable(adapter);
285 free_irq(adapter->pdev->irq, netdev);
286
287 if (adapter->have_msi)
288 pci_disable_msi(adapter->pdev);
289
290 if (kill_watchdog)
291 del_timer_sync(&adapter->watchdog_timer);
292
293 adapter->link_speed = 0;
294 adapter->link_duplex = 0;
295 netif_carrier_off(netdev);
296 netif_stop_queue(netdev);
297
298 ixgb_reset(adapter);
299 ixgb_clean_tx_ring(adapter);
300 ixgb_clean_rx_ring(adapter);
301 }
302
303 void
304 ixgb_reset(struct ixgb_adapter *adapter)
305 {
306 struct ixgb_hw *hw = &adapter->hw;
307
308 ixgb_adapter_stop(hw);
309 if (!ixgb_init_hw(hw))
310 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
311
312 /* restore frame size information */
313 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
314 if (hw->max_frame_size >
315 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
316 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
317 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
318 ctrl0 |= IXGB_CTRL0_JFE;
319 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
320 }
321 }
322 }
323
324 static const struct net_device_ops ixgb_netdev_ops = {
325 .ndo_open = ixgb_open,
326 .ndo_stop = ixgb_close,
327 .ndo_start_xmit = ixgb_xmit_frame,
328 .ndo_get_stats = ixgb_get_stats,
329 .ndo_set_multicast_list = ixgb_set_multi,
330 .ndo_validate_addr = eth_validate_addr,
331 .ndo_set_mac_address = ixgb_set_mac,
332 .ndo_change_mtu = ixgb_change_mtu,
333 .ndo_tx_timeout = ixgb_tx_timeout,
334 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
335 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
336 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
337 #ifdef CONFIG_NET_POLL_CONTROLLER
338 .ndo_poll_controller = ixgb_netpoll,
339 #endif
340 };
341
342 /**
343 * ixgb_probe - Device Initialization Routine
344 * @pdev: PCI device information struct
345 * @ent: entry in ixgb_pci_tbl
346 *
347 * Returns 0 on success, negative on failure
348 *
349 * ixgb_probe initializes an adapter identified by a pci_dev structure.
350 * The OS initialization, configuring of the adapter private structure,
351 * and a hardware reset occur.
352 **/
353
354 static int __devinit
355 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
356 {
357 struct net_device *netdev = NULL;
358 struct ixgb_adapter *adapter;
359 static int cards_found = 0;
360 int pci_using_dac;
361 int i;
362 int err;
363
364 err = pci_enable_device(pdev);
365 if (err)
366 return err;
367
368 if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
369 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
370 pci_using_dac = 1;
371 } else {
372 if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
373 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
374 printk(KERN_ERR
375 "ixgb: No usable DMA configuration, aborting\n");
376 goto err_dma_mask;
377 }
378 pci_using_dac = 0;
379 }
380
381 err = pci_request_regions(pdev, ixgb_driver_name);
382 if (err)
383 goto err_request_regions;
384
385 pci_set_master(pdev);
386
387 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
388 if (!netdev) {
389 err = -ENOMEM;
390 goto err_alloc_etherdev;
391 }
392
393 SET_NETDEV_DEV(netdev, &pdev->dev);
394
395 pci_set_drvdata(pdev, netdev);
396 adapter = netdev_priv(netdev);
397 adapter->netdev = netdev;
398 adapter->pdev = pdev;
399 adapter->hw.back = adapter;
400 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
401
402 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
403 if (!adapter->hw.hw_addr) {
404 err = -EIO;
405 goto err_ioremap;
406 }
407
408 for (i = BAR_1; i <= BAR_5; i++) {
409 if (pci_resource_len(pdev, i) == 0)
410 continue;
411 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
412 adapter->hw.io_base = pci_resource_start(pdev, i);
413 break;
414 }
415 }
416
417 netdev->netdev_ops = &ixgb_netdev_ops;
418 ixgb_set_ethtool_ops(netdev);
419 netdev->watchdog_timeo = 5 * HZ;
420 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
421
422 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
423
424 adapter->bd_number = cards_found;
425 adapter->link_speed = 0;
426 adapter->link_duplex = 0;
427
428 /* setup the private structure */
429
430 err = ixgb_sw_init(adapter);
431 if (err)
432 goto err_sw_init;
433
434 netdev->features = NETIF_F_SG |
435 NETIF_F_HW_CSUM |
436 NETIF_F_HW_VLAN_TX |
437 NETIF_F_HW_VLAN_RX |
438 NETIF_F_HW_VLAN_FILTER;
439 netdev->features |= NETIF_F_TSO;
440
441 if (pci_using_dac)
442 netdev->features |= NETIF_F_HIGHDMA;
443
444 /* make sure the EEPROM is good */
445
446 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
447 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
448 err = -EIO;
449 goto err_eeprom;
450 }
451
452 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
453 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
454
455 if (!is_valid_ether_addr(netdev->perm_addr)) {
456 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
457 err = -EIO;
458 goto err_eeprom;
459 }
460
461 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
462
463 init_timer(&adapter->watchdog_timer);
464 adapter->watchdog_timer.function = &ixgb_watchdog;
465 adapter->watchdog_timer.data = (unsigned long)adapter;
466
467 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
468
469 strcpy(netdev->name, "eth%d");
470 err = register_netdev(netdev);
471 if (err)
472 goto err_register;
473
474 /* we're going to reset, so assume we have no link for now */
475
476 netif_carrier_off(netdev);
477 netif_stop_queue(netdev);
478
479 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
480 ixgb_check_options(adapter);
481 /* reset the hardware with the new settings */
482
483 ixgb_reset(adapter);
484
485 cards_found++;
486 return 0;
487
488 err_register:
489 err_sw_init:
490 err_eeprom:
491 iounmap(adapter->hw.hw_addr);
492 err_ioremap:
493 free_netdev(netdev);
494 err_alloc_etherdev:
495 pci_release_regions(pdev);
496 err_request_regions:
497 err_dma_mask:
498 pci_disable_device(pdev);
499 return err;
500 }
501
502 /**
503 * ixgb_remove - Device Removal Routine
504 * @pdev: PCI device information struct
505 *
506 * ixgb_remove is called by the PCI subsystem to alert the driver
507 * that it should release a PCI device. The could be caused by a
508 * Hot-Plug event, or because the driver is going to be removed from
509 * memory.
510 **/
511
512 static void __devexit
513 ixgb_remove(struct pci_dev *pdev)
514 {
515 struct net_device *netdev = pci_get_drvdata(pdev);
516 struct ixgb_adapter *adapter = netdev_priv(netdev);
517
518 flush_scheduled_work();
519
520 unregister_netdev(netdev);
521
522 iounmap(adapter->hw.hw_addr);
523 pci_release_regions(pdev);
524
525 free_netdev(netdev);
526 }
527
528 /**
529 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
530 * @adapter: board private structure to initialize
531 *
532 * ixgb_sw_init initializes the Adapter private data structure.
533 * Fields are initialized based on PCI device information and
534 * OS network device settings (MTU size).
535 **/
536
537 static int __devinit
538 ixgb_sw_init(struct ixgb_adapter *adapter)
539 {
540 struct ixgb_hw *hw = &adapter->hw;
541 struct net_device *netdev = adapter->netdev;
542 struct pci_dev *pdev = adapter->pdev;
543
544 /* PCI config space info */
545
546 hw->vendor_id = pdev->vendor;
547 hw->device_id = pdev->device;
548 hw->subsystem_vendor_id = pdev->subsystem_vendor;
549 hw->subsystem_id = pdev->subsystem_device;
550
551 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
552 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
553
554 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
555 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
556 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
557 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
558 hw->mac_type = ixgb_82597;
559 else {
560 /* should never have loaded on this device */
561 DPRINTK(PROBE, ERR, "unsupported device id\n");
562 }
563
564 /* enable flow control to be programmed */
565 hw->fc.send_xon = 1;
566
567 set_bit(__IXGB_DOWN, &adapter->flags);
568 return 0;
569 }
570
571 /**
572 * ixgb_open - Called when a network interface is made active
573 * @netdev: network interface device structure
574 *
575 * Returns 0 on success, negative value on failure
576 *
577 * The open entry point is called when a network interface is made
578 * active by the system (IFF_UP). At this point all resources needed
579 * for transmit and receive operations are allocated, the interrupt
580 * handler is registered with the OS, the watchdog timer is started,
581 * and the stack is notified that the interface is ready.
582 **/
583
584 static int
585 ixgb_open(struct net_device *netdev)
586 {
587 struct ixgb_adapter *adapter = netdev_priv(netdev);
588 int err;
589
590 /* allocate transmit descriptors */
591 err = ixgb_setup_tx_resources(adapter);
592 if (err)
593 goto err_setup_tx;
594
595 /* allocate receive descriptors */
596
597 err = ixgb_setup_rx_resources(adapter);
598 if (err)
599 goto err_setup_rx;
600
601 err = ixgb_up(adapter);
602 if (err)
603 goto err_up;
604
605 return 0;
606
607 err_up:
608 ixgb_free_rx_resources(adapter);
609 err_setup_rx:
610 ixgb_free_tx_resources(adapter);
611 err_setup_tx:
612 ixgb_reset(adapter);
613
614 return err;
615 }
616
617 /**
618 * ixgb_close - Disables a network interface
619 * @netdev: network interface device structure
620 *
621 * Returns 0, this is not allowed to fail
622 *
623 * The close entry point is called when an interface is de-activated
624 * by the OS. The hardware is still under the drivers control, but
625 * needs to be disabled. A global MAC reset is issued to stop the
626 * hardware, and all transmit and receive resources are freed.
627 **/
628
629 static int
630 ixgb_close(struct net_device *netdev)
631 {
632 struct ixgb_adapter *adapter = netdev_priv(netdev);
633
634 ixgb_down(adapter, true);
635
636 ixgb_free_tx_resources(adapter);
637 ixgb_free_rx_resources(adapter);
638
639 return 0;
640 }
641
642 /**
643 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
644 * @adapter: board private structure
645 *
646 * Return 0 on success, negative on failure
647 **/
648
649 int
650 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
651 {
652 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
653 struct pci_dev *pdev = adapter->pdev;
654 int size;
655
656 size = sizeof(struct ixgb_buffer) * txdr->count;
657 txdr->buffer_info = vmalloc(size);
658 if (!txdr->buffer_info) {
659 DPRINTK(PROBE, ERR,
660 "Unable to allocate transmit descriptor ring memory\n");
661 return -ENOMEM;
662 }
663 memset(txdr->buffer_info, 0, size);
664
665 /* round up to nearest 4K */
666
667 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
668 txdr->size = ALIGN(txdr->size, 4096);
669
670 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
671 if (!txdr->desc) {
672 vfree(txdr->buffer_info);
673 DPRINTK(PROBE, ERR,
674 "Unable to allocate transmit descriptor memory\n");
675 return -ENOMEM;
676 }
677 memset(txdr->desc, 0, txdr->size);
678
679 txdr->next_to_use = 0;
680 txdr->next_to_clean = 0;
681
682 return 0;
683 }
684
685 /**
686 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
687 * @adapter: board private structure
688 *
689 * Configure the Tx unit of the MAC after a reset.
690 **/
691
692 static void
693 ixgb_configure_tx(struct ixgb_adapter *adapter)
694 {
695 u64 tdba = adapter->tx_ring.dma;
696 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
697 u32 tctl;
698 struct ixgb_hw *hw = &adapter->hw;
699
700 /* Setup the Base and Length of the Tx Descriptor Ring
701 * tx_ring.dma can be either a 32 or 64 bit value
702 */
703
704 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
705 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
706
707 IXGB_WRITE_REG(hw, TDLEN, tdlen);
708
709 /* Setup the HW Tx Head and Tail descriptor pointers */
710
711 IXGB_WRITE_REG(hw, TDH, 0);
712 IXGB_WRITE_REG(hw, TDT, 0);
713
714 /* don't set up txdctl, it induces performance problems if configured
715 * incorrectly */
716 /* Set the Tx Interrupt Delay register */
717
718 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
719
720 /* Program the Transmit Control Register */
721
722 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
723 IXGB_WRITE_REG(hw, TCTL, tctl);
724
725 /* Setup Transmit Descriptor Settings for this adapter */
726 adapter->tx_cmd_type =
727 IXGB_TX_DESC_TYPE |
728 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
729 }
730
731 /**
732 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
733 * @adapter: board private structure
734 *
735 * Returns 0 on success, negative on failure
736 **/
737
738 int
739 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
740 {
741 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
742 struct pci_dev *pdev = adapter->pdev;
743 int size;
744
745 size = sizeof(struct ixgb_buffer) * rxdr->count;
746 rxdr->buffer_info = vmalloc(size);
747 if (!rxdr->buffer_info) {
748 DPRINTK(PROBE, ERR,
749 "Unable to allocate receive descriptor ring\n");
750 return -ENOMEM;
751 }
752 memset(rxdr->buffer_info, 0, size);
753
754 /* Round up to nearest 4K */
755
756 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
757 rxdr->size = ALIGN(rxdr->size, 4096);
758
759 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
760
761 if (!rxdr->desc) {
762 vfree(rxdr->buffer_info);
763 DPRINTK(PROBE, ERR,
764 "Unable to allocate receive descriptors\n");
765 return -ENOMEM;
766 }
767 memset(rxdr->desc, 0, rxdr->size);
768
769 rxdr->next_to_clean = 0;
770 rxdr->next_to_use = 0;
771
772 return 0;
773 }
774
775 /**
776 * ixgb_setup_rctl - configure the receive control register
777 * @adapter: Board private structure
778 **/
779
780 static void
781 ixgb_setup_rctl(struct ixgb_adapter *adapter)
782 {
783 u32 rctl;
784
785 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
786
787 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
788
789 rctl |=
790 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
791 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
792 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
793
794 rctl |= IXGB_RCTL_SECRC;
795
796 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
797 rctl |= IXGB_RCTL_BSIZE_2048;
798 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
799 rctl |= IXGB_RCTL_BSIZE_4096;
800 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
801 rctl |= IXGB_RCTL_BSIZE_8192;
802 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
803 rctl |= IXGB_RCTL_BSIZE_16384;
804
805 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
806 }
807
808 /**
809 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
810 * @adapter: board private structure
811 *
812 * Configure the Rx unit of the MAC after a reset.
813 **/
814
815 static void
816 ixgb_configure_rx(struct ixgb_adapter *adapter)
817 {
818 u64 rdba = adapter->rx_ring.dma;
819 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
820 struct ixgb_hw *hw = &adapter->hw;
821 u32 rctl;
822 u32 rxcsum;
823
824 /* make sure receives are disabled while setting up the descriptors */
825
826 rctl = IXGB_READ_REG(hw, RCTL);
827 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
828
829 /* set the Receive Delay Timer Register */
830
831 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
832
833 /* Setup the Base and Length of the Rx Descriptor Ring */
834
835 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
836 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
837
838 IXGB_WRITE_REG(hw, RDLEN, rdlen);
839
840 /* Setup the HW Rx Head and Tail Descriptor Pointers */
841 IXGB_WRITE_REG(hw, RDH, 0);
842 IXGB_WRITE_REG(hw, RDT, 0);
843
844 /* due to the hardware errata with RXDCTL, we are unable to use any of
845 * the performance enhancing features of it without causing other
846 * subtle bugs, some of the bugs could include receive length
847 * corruption at high data rates (WTHRESH > 0) and/or receive
848 * descriptor ring irregularites (particularly in hardware cache) */
849 IXGB_WRITE_REG(hw, RXDCTL, 0);
850
851 /* Enable Receive Checksum Offload for TCP and UDP */
852 if (adapter->rx_csum) {
853 rxcsum = IXGB_READ_REG(hw, RXCSUM);
854 rxcsum |= IXGB_RXCSUM_TUOFL;
855 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
856 }
857
858 /* Enable Receives */
859
860 IXGB_WRITE_REG(hw, RCTL, rctl);
861 }
862
863 /**
864 * ixgb_free_tx_resources - Free Tx Resources
865 * @adapter: board private structure
866 *
867 * Free all transmit software resources
868 **/
869
870 void
871 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
872 {
873 struct pci_dev *pdev = adapter->pdev;
874
875 ixgb_clean_tx_ring(adapter);
876
877 vfree(adapter->tx_ring.buffer_info);
878 adapter->tx_ring.buffer_info = NULL;
879
880 pci_free_consistent(pdev, adapter->tx_ring.size,
881 adapter->tx_ring.desc, adapter->tx_ring.dma);
882
883 adapter->tx_ring.desc = NULL;
884 }
885
886 static void
887 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
888 struct ixgb_buffer *buffer_info)
889 {
890 buffer_info->dma = 0;
891 if (buffer_info->skb) {
892 skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
893 DMA_TO_DEVICE);
894 dev_kfree_skb_any(buffer_info->skb);
895 buffer_info->skb = NULL;
896 }
897 buffer_info->time_stamp = 0;
898 /* these fields must always be initialized in tx
899 * buffer_info->length = 0;
900 * buffer_info->next_to_watch = 0; */
901 }
902
903 /**
904 * ixgb_clean_tx_ring - Free Tx Buffers
905 * @adapter: board private structure
906 **/
907
908 static void
909 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
910 {
911 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
912 struct ixgb_buffer *buffer_info;
913 unsigned long size;
914 unsigned int i;
915
916 /* Free all the Tx ring sk_buffs */
917
918 for (i = 0; i < tx_ring->count; i++) {
919 buffer_info = &tx_ring->buffer_info[i];
920 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
921 }
922
923 size = sizeof(struct ixgb_buffer) * tx_ring->count;
924 memset(tx_ring->buffer_info, 0, size);
925
926 /* Zero out the descriptor ring */
927
928 memset(tx_ring->desc, 0, tx_ring->size);
929
930 tx_ring->next_to_use = 0;
931 tx_ring->next_to_clean = 0;
932
933 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
934 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
935 }
936
937 /**
938 * ixgb_free_rx_resources - Free Rx Resources
939 * @adapter: board private structure
940 *
941 * Free all receive software resources
942 **/
943
944 void
945 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
946 {
947 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
948 struct pci_dev *pdev = adapter->pdev;
949
950 ixgb_clean_rx_ring(adapter);
951
952 vfree(rx_ring->buffer_info);
953 rx_ring->buffer_info = NULL;
954
955 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
956
957 rx_ring->desc = NULL;
958 }
959
960 /**
961 * ixgb_clean_rx_ring - Free Rx Buffers
962 * @adapter: board private structure
963 **/
964
965 static void
966 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
967 {
968 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
969 struct ixgb_buffer *buffer_info;
970 struct pci_dev *pdev = adapter->pdev;
971 unsigned long size;
972 unsigned int i;
973
974 /* Free all the Rx ring sk_buffs */
975
976 for (i = 0; i < rx_ring->count; i++) {
977 buffer_info = &rx_ring->buffer_info[i];
978 if (buffer_info->dma) {
979 pci_unmap_single(pdev,
980 buffer_info->dma,
981 buffer_info->length,
982 PCI_DMA_FROMDEVICE);
983 buffer_info->dma = 0;
984 buffer_info->length = 0;
985 }
986
987 if (buffer_info->skb) {
988 dev_kfree_skb(buffer_info->skb);
989 buffer_info->skb = NULL;
990 }
991 }
992
993 size = sizeof(struct ixgb_buffer) * rx_ring->count;
994 memset(rx_ring->buffer_info, 0, size);
995
996 /* Zero out the descriptor ring */
997
998 memset(rx_ring->desc, 0, rx_ring->size);
999
1000 rx_ring->next_to_clean = 0;
1001 rx_ring->next_to_use = 0;
1002
1003 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1004 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1005 }
1006
1007 /**
1008 * ixgb_set_mac - Change the Ethernet Address of the NIC
1009 * @netdev: network interface device structure
1010 * @p: pointer to an address structure
1011 *
1012 * Returns 0 on success, negative on failure
1013 **/
1014
1015 static int
1016 ixgb_set_mac(struct net_device *netdev, void *p)
1017 {
1018 struct ixgb_adapter *adapter = netdev_priv(netdev);
1019 struct sockaddr *addr = p;
1020
1021 if (!is_valid_ether_addr(addr->sa_data))
1022 return -EADDRNOTAVAIL;
1023
1024 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1025
1026 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1027
1028 return 0;
1029 }
1030
1031 /**
1032 * ixgb_set_multi - Multicast and Promiscuous mode set
1033 * @netdev: network interface device structure
1034 *
1035 * The set_multi entry point is called whenever the multicast address
1036 * list or the network interface flags are updated. This routine is
1037 * responsible for configuring the hardware for proper multicast,
1038 * promiscuous mode, and all-multi behavior.
1039 **/
1040
1041 static void
1042 ixgb_set_multi(struct net_device *netdev)
1043 {
1044 struct ixgb_adapter *adapter = netdev_priv(netdev);
1045 struct ixgb_hw *hw = &adapter->hw;
1046 struct dev_mc_list *mc_ptr;
1047 u32 rctl;
1048 int i;
1049
1050 /* Check for Promiscuous and All Multicast modes */
1051
1052 rctl = IXGB_READ_REG(hw, RCTL);
1053
1054 if (netdev->flags & IFF_PROMISC) {
1055 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1056 rctl &= ~IXGB_RCTL_VFE;
1057 } else {
1058 if (netdev->flags & IFF_ALLMULTI) {
1059 rctl |= IXGB_RCTL_MPE;
1060 rctl &= ~IXGB_RCTL_UPE;
1061 } else {
1062 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1063 }
1064 rctl |= IXGB_RCTL_VFE;
1065 }
1066
1067 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1068 rctl |= IXGB_RCTL_MPE;
1069 IXGB_WRITE_REG(hw, RCTL, rctl);
1070 } else {
1071 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1072 IXGB_ETH_LENGTH_OF_ADDRESS];
1073
1074 IXGB_WRITE_REG(hw, RCTL, rctl);
1075
1076 for (i = 0, mc_ptr = netdev->mc_list;
1077 mc_ptr;
1078 i++, mc_ptr = mc_ptr->next)
1079 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1080 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1081
1082 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1083 }
1084 }
1085
1086 /**
1087 * ixgb_watchdog - Timer Call-back
1088 * @data: pointer to netdev cast into an unsigned long
1089 **/
1090
1091 static void
1092 ixgb_watchdog(unsigned long data)
1093 {
1094 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1095 struct net_device *netdev = adapter->netdev;
1096 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1097
1098 ixgb_check_for_link(&adapter->hw);
1099
1100 if (ixgb_check_for_bad_link(&adapter->hw)) {
1101 /* force the reset path */
1102 netif_stop_queue(netdev);
1103 }
1104
1105 if (adapter->hw.link_up) {
1106 if (!netif_carrier_ok(netdev)) {
1107 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1108 "Full Duplex, Flow Control: %s\n",
1109 netdev->name,
1110 (adapter->hw.fc.type == ixgb_fc_full) ?
1111 "RX/TX" :
1112 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1113 "RX" :
1114 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1115 "TX" : "None")));
1116 adapter->link_speed = 10000;
1117 adapter->link_duplex = FULL_DUPLEX;
1118 netif_carrier_on(netdev);
1119 netif_wake_queue(netdev);
1120 }
1121 } else {
1122 if (netif_carrier_ok(netdev)) {
1123 adapter->link_speed = 0;
1124 adapter->link_duplex = 0;
1125 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1126 netdev->name);
1127 netif_carrier_off(netdev);
1128 netif_stop_queue(netdev);
1129
1130 }
1131 }
1132
1133 ixgb_update_stats(adapter);
1134
1135 if (!netif_carrier_ok(netdev)) {
1136 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1137 /* We've lost link, so the controller stops DMA,
1138 * but we've got queued Tx work that's never going
1139 * to get done, so reset controller to flush Tx.
1140 * (Do the reset outside of interrupt context). */
1141 schedule_work(&adapter->tx_timeout_task);
1142 }
1143 }
1144
1145 /* Force detection of hung controller every watchdog period */
1146 adapter->detect_tx_hung = true;
1147
1148 /* generate an interrupt to force clean up of any stragglers */
1149 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1150
1151 /* Reset the timer */
1152 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1153 }
1154
1155 #define IXGB_TX_FLAGS_CSUM 0x00000001
1156 #define IXGB_TX_FLAGS_VLAN 0x00000002
1157 #define IXGB_TX_FLAGS_TSO 0x00000004
1158
1159 static int
1160 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1161 {
1162 struct ixgb_context_desc *context_desc;
1163 unsigned int i;
1164 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1165 u16 ipcse, tucse, mss;
1166 int err;
1167
1168 if (likely(skb_is_gso(skb))) {
1169 struct ixgb_buffer *buffer_info;
1170 struct iphdr *iph;
1171
1172 if (skb_header_cloned(skb)) {
1173 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1174 if (err)
1175 return err;
1176 }
1177
1178 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1179 mss = skb_shinfo(skb)->gso_size;
1180 iph = ip_hdr(skb);
1181 iph->tot_len = 0;
1182 iph->check = 0;
1183 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1184 iph->daddr, 0,
1185 IPPROTO_TCP, 0);
1186 ipcss = skb_network_offset(skb);
1187 ipcso = (void *)&(iph->check) - (void *)skb->data;
1188 ipcse = skb_transport_offset(skb) - 1;
1189 tucss = skb_transport_offset(skb);
1190 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1191 tucse = 0;
1192
1193 i = adapter->tx_ring.next_to_use;
1194 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1195 buffer_info = &adapter->tx_ring.buffer_info[i];
1196 WARN_ON(buffer_info->dma != 0);
1197
1198 context_desc->ipcss = ipcss;
1199 context_desc->ipcso = ipcso;
1200 context_desc->ipcse = cpu_to_le16(ipcse);
1201 context_desc->tucss = tucss;
1202 context_desc->tucso = tucso;
1203 context_desc->tucse = cpu_to_le16(tucse);
1204 context_desc->mss = cpu_to_le16(mss);
1205 context_desc->hdr_len = hdr_len;
1206 context_desc->status = 0;
1207 context_desc->cmd_type_len = cpu_to_le32(
1208 IXGB_CONTEXT_DESC_TYPE
1209 | IXGB_CONTEXT_DESC_CMD_TSE
1210 | IXGB_CONTEXT_DESC_CMD_IP
1211 | IXGB_CONTEXT_DESC_CMD_TCP
1212 | IXGB_CONTEXT_DESC_CMD_IDE
1213 | (skb->len - (hdr_len)));
1214
1215
1216 if (++i == adapter->tx_ring.count) i = 0;
1217 adapter->tx_ring.next_to_use = i;
1218
1219 return 1;
1220 }
1221
1222 return 0;
1223 }
1224
1225 static bool
1226 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1227 {
1228 struct ixgb_context_desc *context_desc;
1229 unsigned int i;
1230 u8 css, cso;
1231
1232 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1233 struct ixgb_buffer *buffer_info;
1234 css = skb_transport_offset(skb);
1235 cso = css + skb->csum_offset;
1236
1237 i = adapter->tx_ring.next_to_use;
1238 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1239 buffer_info = &adapter->tx_ring.buffer_info[i];
1240 WARN_ON(buffer_info->dma != 0);
1241
1242 context_desc->tucss = css;
1243 context_desc->tucso = cso;
1244 context_desc->tucse = 0;
1245 /* zero out any previously existing data in one instruction */
1246 *(u32 *)&(context_desc->ipcss) = 0;
1247 context_desc->status = 0;
1248 context_desc->hdr_len = 0;
1249 context_desc->mss = 0;
1250 context_desc->cmd_type_len =
1251 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252 | IXGB_TX_DESC_CMD_IDE);
1253
1254 if (++i == adapter->tx_ring.count) i = 0;
1255 adapter->tx_ring.next_to_use = i;
1256
1257 return true;
1258 }
1259
1260 return false;
1261 }
1262
1263 #define IXGB_MAX_TXD_PWR 14
1264 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1265
1266 static int
1267 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1268 unsigned int first)
1269 {
1270 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1271 struct ixgb_buffer *buffer_info;
1272 int len = skb_headlen(skb);
1273 unsigned int offset = 0, size, count = 0, i;
1274 unsigned int mss = skb_shinfo(skb)->gso_size;
1275
1276 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1277 unsigned int f;
1278 dma_addr_t *map;
1279
1280 i = tx_ring->next_to_use;
1281
1282 if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
1283 dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
1284 return 0;
1285 }
1286
1287 map = skb_shinfo(skb)->dma_maps;
1288
1289 while (len) {
1290 buffer_info = &tx_ring->buffer_info[i];
1291 size = min(len, IXGB_MAX_DATA_PER_TXD);
1292 /* Workaround for premature desc write-backs
1293 * in TSO mode. Append 4-byte sentinel desc */
1294 if (unlikely(mss && !nr_frags && size == len && size > 8))
1295 size -= 4;
1296
1297 buffer_info->length = size;
1298 WARN_ON(buffer_info->dma != 0);
1299 buffer_info->time_stamp = jiffies;
1300 buffer_info->dma = map[0] + offset;
1301 pci_map_single(adapter->pdev,
1302 skb->data + offset,
1303 size,
1304 PCI_DMA_TODEVICE);
1305 buffer_info->next_to_watch = 0;
1306
1307 len -= size;
1308 offset += size;
1309 count++;
1310 if (len) {
1311 i++;
1312 if (i == tx_ring->count)
1313 i = 0;
1314 }
1315 }
1316
1317 for (f = 0; f < nr_frags; f++) {
1318 struct skb_frag_struct *frag;
1319
1320 frag = &skb_shinfo(skb)->frags[f];
1321 len = frag->size;
1322 offset = 0;
1323
1324 while (len) {
1325 i++;
1326 if (i == tx_ring->count)
1327 i = 0;
1328
1329 buffer_info = &tx_ring->buffer_info[i];
1330 size = min(len, IXGB_MAX_DATA_PER_TXD);
1331
1332 /* Workaround for premature desc write-backs
1333 * in TSO mode. Append 4-byte sentinel desc */
1334 if (unlikely(mss && (f == (nr_frags - 1))
1335 && size == len && size > 8))
1336 size -= 4;
1337
1338 buffer_info->length = size;
1339 buffer_info->time_stamp = jiffies;
1340 buffer_info->dma = map[f + 1] + offset;
1341 buffer_info->next_to_watch = 0;
1342
1343 len -= size;
1344 offset += size;
1345 count++;
1346 }
1347 }
1348 tx_ring->buffer_info[i].skb = skb;
1349 tx_ring->buffer_info[first].next_to_watch = i;
1350
1351 return count;
1352 }
1353
1354 static void
1355 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1356 {
1357 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1358 struct ixgb_tx_desc *tx_desc = NULL;
1359 struct ixgb_buffer *buffer_info;
1360 u32 cmd_type_len = adapter->tx_cmd_type;
1361 u8 status = 0;
1362 u8 popts = 0;
1363 unsigned int i;
1364
1365 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1366 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1367 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1368 }
1369
1370 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1371 popts |= IXGB_TX_DESC_POPTS_TXSM;
1372
1373 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1374 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1375
1376 i = tx_ring->next_to_use;
1377
1378 while (count--) {
1379 buffer_info = &tx_ring->buffer_info[i];
1380 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1381 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1382 tx_desc->cmd_type_len =
1383 cpu_to_le32(cmd_type_len | buffer_info->length);
1384 tx_desc->status = status;
1385 tx_desc->popts = popts;
1386 tx_desc->vlan = cpu_to_le16(vlan_id);
1387
1388 if (++i == tx_ring->count) i = 0;
1389 }
1390
1391 tx_desc->cmd_type_len |=
1392 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1393
1394 /* Force memory writes to complete before letting h/w
1395 * know there are new descriptors to fetch. (Only
1396 * applicable for weak-ordered memory model archs,
1397 * such as IA-64). */
1398 wmb();
1399
1400 tx_ring->next_to_use = i;
1401 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1402 }
1403
1404 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1405 {
1406 struct ixgb_adapter *adapter = netdev_priv(netdev);
1407 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1408
1409 netif_stop_queue(netdev);
1410 /* Herbert's original patch had:
1411 * smp_mb__after_netif_stop_queue();
1412 * but since that doesn't exist yet, just open code it. */
1413 smp_mb();
1414
1415 /* We need to check again in a case another CPU has just
1416 * made room available. */
1417 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1418 return -EBUSY;
1419
1420 /* A reprieve! */
1421 netif_start_queue(netdev);
1422 ++adapter->restart_queue;
1423 return 0;
1424 }
1425
1426 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1427 struct ixgb_desc_ring *tx_ring, int size)
1428 {
1429 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1430 return 0;
1431 return __ixgb_maybe_stop_tx(netdev, size);
1432 }
1433
1434
1435 /* Tx Descriptors needed, worst case */
1436 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1437 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1438 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1439 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1440 + 1 /* one more needed for sentinel TSO workaround */
1441
1442 static int
1443 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1444 {
1445 struct ixgb_adapter *adapter = netdev_priv(netdev);
1446 unsigned int first;
1447 unsigned int tx_flags = 0;
1448 int vlan_id = 0;
1449 int count = 0;
1450 int tso;
1451
1452 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1453 dev_kfree_skb(skb);
1454 return NETDEV_TX_OK;
1455 }
1456
1457 if (skb->len <= 0) {
1458 dev_kfree_skb(skb);
1459 return 0;
1460 }
1461
1462 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1463 DESC_NEEDED)))
1464 return NETDEV_TX_BUSY;
1465
1466 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1467 tx_flags |= IXGB_TX_FLAGS_VLAN;
1468 vlan_id = vlan_tx_tag_get(skb);
1469 }
1470
1471 first = adapter->tx_ring.next_to_use;
1472
1473 tso = ixgb_tso(adapter, skb);
1474 if (tso < 0) {
1475 dev_kfree_skb(skb);
1476 return NETDEV_TX_OK;
1477 }
1478
1479 if (likely(tso))
1480 tx_flags |= IXGB_TX_FLAGS_TSO;
1481 else if (ixgb_tx_csum(adapter, skb))
1482 tx_flags |= IXGB_TX_FLAGS_CSUM;
1483
1484 count = ixgb_tx_map(adapter, skb, first);
1485
1486 if (count) {
1487 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1488 netdev->trans_start = jiffies;
1489 /* Make sure there is space in the ring for the next send. */
1490 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1491
1492 } else {
1493 dev_kfree_skb_any(skb);
1494 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1495 adapter->tx_ring.next_to_use = first;
1496 }
1497
1498 return NETDEV_TX_OK;
1499 }
1500
1501 /**
1502 * ixgb_tx_timeout - Respond to a Tx Hang
1503 * @netdev: network interface device structure
1504 **/
1505
1506 static void
1507 ixgb_tx_timeout(struct net_device *netdev)
1508 {
1509 struct ixgb_adapter *adapter = netdev_priv(netdev);
1510
1511 /* Do the reset outside of interrupt context */
1512 schedule_work(&adapter->tx_timeout_task);
1513 }
1514
1515 static void
1516 ixgb_tx_timeout_task(struct work_struct *work)
1517 {
1518 struct ixgb_adapter *adapter =
1519 container_of(work, struct ixgb_adapter, tx_timeout_task);
1520
1521 adapter->tx_timeout_count++;
1522 ixgb_down(adapter, true);
1523 ixgb_up(adapter);
1524 }
1525
1526 /**
1527 * ixgb_get_stats - Get System Network Statistics
1528 * @netdev: network interface device structure
1529 *
1530 * Returns the address of the device statistics structure.
1531 * The statistics are actually updated from the timer callback.
1532 **/
1533
1534 static struct net_device_stats *
1535 ixgb_get_stats(struct net_device *netdev)
1536 {
1537 struct ixgb_adapter *adapter = netdev_priv(netdev);
1538
1539 return &adapter->net_stats;
1540 }
1541
1542 /**
1543 * ixgb_change_mtu - Change the Maximum Transfer Unit
1544 * @netdev: network interface device structure
1545 * @new_mtu: new value for maximum frame size
1546 *
1547 * Returns 0 on success, negative on failure
1548 **/
1549
1550 static int
1551 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1552 {
1553 struct ixgb_adapter *adapter = netdev_priv(netdev);
1554 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1555 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1556
1557 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1558 if ((new_mtu < 68) ||
1559 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1560 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1561 return -EINVAL;
1562 }
1563
1564 if (old_max_frame == max_frame)
1565 return 0;
1566
1567 if (netif_running(netdev))
1568 ixgb_down(adapter, true);
1569
1570 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1571
1572 netdev->mtu = new_mtu;
1573
1574 if (netif_running(netdev))
1575 ixgb_up(adapter);
1576
1577 return 0;
1578 }
1579
1580 /**
1581 * ixgb_update_stats - Update the board statistics counters.
1582 * @adapter: board private structure
1583 **/
1584
1585 void
1586 ixgb_update_stats(struct ixgb_adapter *adapter)
1587 {
1588 struct net_device *netdev = adapter->netdev;
1589 struct pci_dev *pdev = adapter->pdev;
1590
1591 /* Prevent stats update while adapter is being reset */
1592 if (pci_channel_offline(pdev))
1593 return;
1594
1595 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1596 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1597 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1598 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1599 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1600 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1601
1602 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1603 /* fix up multicast stats by removing broadcasts */
1604 if (multi >= bcast)
1605 multi -= bcast;
1606
1607 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1608 adapter->stats.mprch += (multi >> 32);
1609 adapter->stats.bprcl += bcast_l;
1610 adapter->stats.bprch += bcast_h;
1611 } else {
1612 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1613 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1614 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1615 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1616 }
1617 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1618 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1619 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1620 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1621 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1622 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1623 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1624 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1625 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1626 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1627 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1628 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1629 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1630 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1631 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1632 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1633 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1634 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1635 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1636 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1637 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1638 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1639 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1640 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1641 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1642 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1643 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1644 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1645 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1646 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1647 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1648 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1649 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1650 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1651 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1652 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1653 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1654 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1655 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1656 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1657 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1658 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1659 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1660 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1661 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1662 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1663 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1664 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1665 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1666 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1667 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1668 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1669 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1670 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1671 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1672 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1673
1674 /* Fill out the OS statistics structure */
1675
1676 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1677 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1678 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1679 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1680 adapter->net_stats.multicast = adapter->stats.mprcl;
1681 adapter->net_stats.collisions = 0;
1682
1683 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1684 * with a length in the type/len field */
1685 adapter->net_stats.rx_errors =
1686 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1687 adapter->stats.ruc +
1688 adapter->stats.roc /*+ adapter->stats.rlec */ +
1689 adapter->stats.icbc +
1690 adapter->stats.ecbc + adapter->stats.mpc;
1691
1692 /* see above
1693 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1694 */
1695
1696 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1697 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1698 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1699 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1700
1701 adapter->net_stats.tx_errors = 0;
1702 adapter->net_stats.rx_frame_errors = 0;
1703 adapter->net_stats.tx_aborted_errors = 0;
1704 adapter->net_stats.tx_carrier_errors = 0;
1705 adapter->net_stats.tx_fifo_errors = 0;
1706 adapter->net_stats.tx_heartbeat_errors = 0;
1707 adapter->net_stats.tx_window_errors = 0;
1708 }
1709
1710 #define IXGB_MAX_INTR 10
1711 /**
1712 * ixgb_intr - Interrupt Handler
1713 * @irq: interrupt number
1714 * @data: pointer to a network interface device structure
1715 **/
1716
1717 static irqreturn_t
1718 ixgb_intr(int irq, void *data)
1719 {
1720 struct net_device *netdev = data;
1721 struct ixgb_adapter *adapter = netdev_priv(netdev);
1722 struct ixgb_hw *hw = &adapter->hw;
1723 u32 icr = IXGB_READ_REG(hw, ICR);
1724
1725 if (unlikely(!icr))
1726 return IRQ_NONE; /* Not our interrupt */
1727
1728 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1729 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1730 mod_timer(&adapter->watchdog_timer, jiffies);
1731
1732 if (napi_schedule_prep(&adapter->napi)) {
1733
1734 /* Disable interrupts and register for poll. The flush
1735 of the posted write is intentionally left out.
1736 */
1737
1738 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1739 __napi_schedule(&adapter->napi);
1740 }
1741 return IRQ_HANDLED;
1742 }
1743
1744 /**
1745 * ixgb_clean - NAPI Rx polling callback
1746 * @adapter: board private structure
1747 **/
1748
1749 static int
1750 ixgb_clean(struct napi_struct *napi, int budget)
1751 {
1752 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1753 int work_done = 0;
1754
1755 ixgb_clean_tx_irq(adapter);
1756 ixgb_clean_rx_irq(adapter, &work_done, budget);
1757
1758 /* If budget not fully consumed, exit the polling mode */
1759 if (work_done < budget) {
1760 napi_complete(napi);
1761 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1762 ixgb_irq_enable(adapter);
1763 }
1764
1765 return work_done;
1766 }
1767
1768 /**
1769 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1770 * @adapter: board private structure
1771 **/
1772
1773 static bool
1774 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1775 {
1776 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1777 struct net_device *netdev = adapter->netdev;
1778 struct ixgb_tx_desc *tx_desc, *eop_desc;
1779 struct ixgb_buffer *buffer_info;
1780 unsigned int i, eop;
1781 bool cleaned = false;
1782
1783 i = tx_ring->next_to_clean;
1784 eop = tx_ring->buffer_info[i].next_to_watch;
1785 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1786
1787 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1788
1789 for (cleaned = false; !cleaned; ) {
1790 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1791 buffer_info = &tx_ring->buffer_info[i];
1792
1793 if (tx_desc->popts &
1794 (IXGB_TX_DESC_POPTS_TXSM |
1795 IXGB_TX_DESC_POPTS_IXSM))
1796 adapter->hw_csum_tx_good++;
1797
1798 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1799
1800 *(u32 *)&(tx_desc->status) = 0;
1801
1802 cleaned = (i == eop);
1803 if (++i == tx_ring->count) i = 0;
1804 }
1805
1806 eop = tx_ring->buffer_info[i].next_to_watch;
1807 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1808 }
1809
1810 tx_ring->next_to_clean = i;
1811
1812 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1813 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1814 /* Make sure that anybody stopping the queue after this
1815 * sees the new next_to_clean. */
1816 smp_mb();
1817
1818 if (netif_queue_stopped(netdev) &&
1819 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1820 netif_wake_queue(netdev);
1821 ++adapter->restart_queue;
1822 }
1823 }
1824
1825 if (adapter->detect_tx_hung) {
1826 /* detect a transmit hang in hardware, this serializes the
1827 * check with the clearing of time_stamp and movement of i */
1828 adapter->detect_tx_hung = false;
1829 if (tx_ring->buffer_info[eop].time_stamp &&
1830 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1831 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1832 IXGB_STATUS_TXOFF)) {
1833 /* detected Tx unit hang */
1834 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1835 " TDH <%x>\n"
1836 " TDT <%x>\n"
1837 " next_to_use <%x>\n"
1838 " next_to_clean <%x>\n"
1839 "buffer_info[next_to_clean]\n"
1840 " time_stamp <%lx>\n"
1841 " next_to_watch <%x>\n"
1842 " jiffies <%lx>\n"
1843 " next_to_watch.status <%x>\n",
1844 IXGB_READ_REG(&adapter->hw, TDH),
1845 IXGB_READ_REG(&adapter->hw, TDT),
1846 tx_ring->next_to_use,
1847 tx_ring->next_to_clean,
1848 tx_ring->buffer_info[eop].time_stamp,
1849 eop,
1850 jiffies,
1851 eop_desc->status);
1852 netif_stop_queue(netdev);
1853 }
1854 }
1855
1856 return cleaned;
1857 }
1858
1859 /**
1860 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1861 * @adapter: board private structure
1862 * @rx_desc: receive descriptor
1863 * @sk_buff: socket buffer with received data
1864 **/
1865
1866 static void
1867 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1868 struct ixgb_rx_desc *rx_desc,
1869 struct sk_buff *skb)
1870 {
1871 /* Ignore Checksum bit is set OR
1872 * TCP Checksum has not been calculated
1873 */
1874 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1875 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1876 skb->ip_summed = CHECKSUM_NONE;
1877 return;
1878 }
1879
1880 /* At this point we know the hardware did the TCP checksum */
1881 /* now look at the TCP checksum error bit */
1882 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1883 /* let the stack verify checksum errors */
1884 skb->ip_summed = CHECKSUM_NONE;
1885 adapter->hw_csum_rx_error++;
1886 } else {
1887 /* TCP checksum is good */
1888 skb->ip_summed = CHECKSUM_UNNECESSARY;
1889 adapter->hw_csum_rx_good++;
1890 }
1891 }
1892
1893 /**
1894 * ixgb_clean_rx_irq - Send received data up the network stack,
1895 * @adapter: board private structure
1896 **/
1897
1898 static bool
1899 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1900 {
1901 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1902 struct net_device *netdev = adapter->netdev;
1903 struct pci_dev *pdev = adapter->pdev;
1904 struct ixgb_rx_desc *rx_desc, *next_rxd;
1905 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1906 u32 length;
1907 unsigned int i, j;
1908 int cleaned_count = 0;
1909 bool cleaned = false;
1910
1911 i = rx_ring->next_to_clean;
1912 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1913 buffer_info = &rx_ring->buffer_info[i];
1914
1915 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1916 struct sk_buff *skb;
1917 u8 status;
1918
1919 if (*work_done >= work_to_do)
1920 break;
1921
1922 (*work_done)++;
1923 status = rx_desc->status;
1924 skb = buffer_info->skb;
1925 buffer_info->skb = NULL;
1926
1927 prefetch(skb->data - NET_IP_ALIGN);
1928
1929 if (++i == rx_ring->count) i = 0;
1930 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1931 prefetch(next_rxd);
1932
1933 if ((j = i + 1) == rx_ring->count) j = 0;
1934 next2_buffer = &rx_ring->buffer_info[j];
1935 prefetch(next2_buffer);
1936
1937 next_buffer = &rx_ring->buffer_info[i];
1938
1939 cleaned = true;
1940 cleaned_count++;
1941
1942 pci_unmap_single(pdev,
1943 buffer_info->dma,
1944 buffer_info->length,
1945 PCI_DMA_FROMDEVICE);
1946 buffer_info->dma = 0;
1947
1948 length = le16_to_cpu(rx_desc->length);
1949 rx_desc->length = 0;
1950
1951 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1952
1953 /* All receives must fit into a single buffer */
1954
1955 IXGB_DBG("Receive packet consumed multiple buffers "
1956 "length<%x>\n", length);
1957
1958 dev_kfree_skb_irq(skb);
1959 goto rxdesc_done;
1960 }
1961
1962 if (unlikely(rx_desc->errors &
1963 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1964 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1965 dev_kfree_skb_irq(skb);
1966 goto rxdesc_done;
1967 }
1968
1969 /* code added for copybreak, this should improve
1970 * performance for small packets with large amounts
1971 * of reassembly being done in the stack */
1972 if (length < copybreak) {
1973 struct sk_buff *new_skb =
1974 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1975 if (new_skb) {
1976 skb_reserve(new_skb, NET_IP_ALIGN);
1977 skb_copy_to_linear_data_offset(new_skb,
1978 -NET_IP_ALIGN,
1979 (skb->data -
1980 NET_IP_ALIGN),
1981 (length +
1982 NET_IP_ALIGN));
1983 /* save the skb in buffer_info as good */
1984 buffer_info->skb = skb;
1985 skb = new_skb;
1986 }
1987 }
1988 /* end copybreak code */
1989
1990 /* Good Receive */
1991 skb_put(skb, length);
1992
1993 /* Receive Checksum Offload */
1994 ixgb_rx_checksum(adapter, rx_desc, skb);
1995
1996 skb->protocol = eth_type_trans(skb, netdev);
1997 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1998 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1999 le16_to_cpu(rx_desc->special));
2000 } else {
2001 netif_receive_skb(skb);
2002 }
2003
2004 rxdesc_done:
2005 /* clean up descriptor, might be written over by hw */
2006 rx_desc->status = 0;
2007
2008 /* return some buffers to hardware, one at a time is too slow */
2009 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2010 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2011 cleaned_count = 0;
2012 }
2013
2014 /* use prefetched values */
2015 rx_desc = next_rxd;
2016 buffer_info = next_buffer;
2017 }
2018
2019 rx_ring->next_to_clean = i;
2020
2021 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2022 if (cleaned_count)
2023 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2024
2025 return cleaned;
2026 }
2027
2028 /**
2029 * ixgb_alloc_rx_buffers - Replace used receive buffers
2030 * @adapter: address of board private structure
2031 **/
2032
2033 static void
2034 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2035 {
2036 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2037 struct net_device *netdev = adapter->netdev;
2038 struct pci_dev *pdev = adapter->pdev;
2039 struct ixgb_rx_desc *rx_desc;
2040 struct ixgb_buffer *buffer_info;
2041 struct sk_buff *skb;
2042 unsigned int i;
2043 long cleancount;
2044
2045 i = rx_ring->next_to_use;
2046 buffer_info = &rx_ring->buffer_info[i];
2047 cleancount = IXGB_DESC_UNUSED(rx_ring);
2048
2049
2050 /* leave three descriptors unused */
2051 while (--cleancount > 2 && cleaned_count--) {
2052 /* recycle! its good for you */
2053 skb = buffer_info->skb;
2054 if (skb) {
2055 skb_trim(skb, 0);
2056 goto map_skb;
2057 }
2058
2059 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2060 + NET_IP_ALIGN);
2061 if (unlikely(!skb)) {
2062 /* Better luck next round */
2063 adapter->alloc_rx_buff_failed++;
2064 break;
2065 }
2066
2067 /* Make buffer alignment 2 beyond a 16 byte boundary
2068 * this will result in a 16 byte aligned IP header after
2069 * the 14 byte MAC header is removed
2070 */
2071 skb_reserve(skb, NET_IP_ALIGN);
2072
2073 buffer_info->skb = skb;
2074 buffer_info->length = adapter->rx_buffer_len;
2075 map_skb:
2076 buffer_info->dma = pci_map_single(pdev,
2077 skb->data,
2078 adapter->rx_buffer_len,
2079 PCI_DMA_FROMDEVICE);
2080
2081 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2082 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2083 /* guarantee DD bit not set now before h/w gets descriptor
2084 * this is the rest of the workaround for h/w double
2085 * writeback. */
2086 rx_desc->status = 0;
2087
2088
2089 if (++i == rx_ring->count) i = 0;
2090 buffer_info = &rx_ring->buffer_info[i];
2091 }
2092
2093 if (likely(rx_ring->next_to_use != i)) {
2094 rx_ring->next_to_use = i;
2095 if (unlikely(i-- == 0))
2096 i = (rx_ring->count - 1);
2097
2098 /* Force memory writes to complete before letting h/w
2099 * know there are new descriptors to fetch. (Only
2100 * applicable for weak-ordered memory model archs, such
2101 * as IA-64). */
2102 wmb();
2103 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2104 }
2105 }
2106
2107 /**
2108 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2109 *
2110 * @param netdev network interface device structure
2111 * @param grp indicates to enable or disable tagging/stripping
2112 **/
2113 static void
2114 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2115 {
2116 struct ixgb_adapter *adapter = netdev_priv(netdev);
2117 u32 ctrl, rctl;
2118
2119 ixgb_irq_disable(adapter);
2120 adapter->vlgrp = grp;
2121
2122 if (grp) {
2123 /* enable VLAN tag insert/strip */
2124 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2125 ctrl |= IXGB_CTRL0_VME;
2126 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2127
2128 /* enable VLAN receive filtering */
2129
2130 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2131 rctl &= ~IXGB_RCTL_CFIEN;
2132 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2133 } else {
2134 /* disable VLAN tag insert/strip */
2135
2136 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2137 ctrl &= ~IXGB_CTRL0_VME;
2138 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2139 }
2140
2141 /* don't enable interrupts unless we are UP */
2142 if (adapter->netdev->flags & IFF_UP)
2143 ixgb_irq_enable(adapter);
2144 }
2145
2146 static void
2147 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2148 {
2149 struct ixgb_adapter *adapter = netdev_priv(netdev);
2150 u32 vfta, index;
2151
2152 /* add VID to filter table */
2153
2154 index = (vid >> 5) & 0x7F;
2155 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2156 vfta |= (1 << (vid & 0x1F));
2157 ixgb_write_vfta(&adapter->hw, index, vfta);
2158 }
2159
2160 static void
2161 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2162 {
2163 struct ixgb_adapter *adapter = netdev_priv(netdev);
2164 u32 vfta, index;
2165
2166 ixgb_irq_disable(adapter);
2167
2168 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2169
2170 /* don't enable interrupts unless we are UP */
2171 if (adapter->netdev->flags & IFF_UP)
2172 ixgb_irq_enable(adapter);
2173
2174 /* remove VID from 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_restore_vlan(struct ixgb_adapter *adapter)
2184 {
2185 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2186
2187 if (adapter->vlgrp) {
2188 u16 vid;
2189 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2190 if (!vlan_group_get_device(adapter->vlgrp, vid))
2191 continue;
2192 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2193 }
2194 }
2195 }
2196
2197 #ifdef CONFIG_NET_POLL_CONTROLLER
2198 /*
2199 * Polling 'interrupt' - used by things like netconsole to send skbs
2200 * without having to re-enable interrupts. It's not called while
2201 * the interrupt routine is executing.
2202 */
2203
2204 static void ixgb_netpoll(struct net_device *dev)
2205 {
2206 struct ixgb_adapter *adapter = netdev_priv(dev);
2207
2208 disable_irq(adapter->pdev->irq);
2209 ixgb_intr(adapter->pdev->irq, dev);
2210 enable_irq(adapter->pdev->irq);
2211 }
2212 #endif
2213
2214 /**
2215 * ixgb_io_error_detected() - called when PCI error is detected
2216 * @pdev pointer to pci device with error
2217 * @state pci channel state after error
2218 *
2219 * This callback is called by the PCI subsystem whenever
2220 * a PCI bus error is detected.
2221 */
2222 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2223 enum pci_channel_state state)
2224 {
2225 struct net_device *netdev = pci_get_drvdata(pdev);
2226 struct ixgb_adapter *adapter = netdev_priv(netdev);
2227
2228 if (netif_running(netdev))
2229 ixgb_down(adapter, true);
2230
2231 pci_disable_device(pdev);
2232
2233 /* Request a slot reset. */
2234 return PCI_ERS_RESULT_NEED_RESET;
2235 }
2236
2237 /**
2238 * ixgb_io_slot_reset - called after the pci bus has been reset.
2239 * @pdev pointer to pci device with error
2240 *
2241 * This callback is called after the PCI bus has been reset.
2242 * Basically, this tries to restart the card from scratch.
2243 * This is a shortened version of the device probe/discovery code,
2244 * it resembles the first-half of the ixgb_probe() routine.
2245 */
2246 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2247 {
2248 struct net_device *netdev = pci_get_drvdata(pdev);
2249 struct ixgb_adapter *adapter = netdev_priv(netdev);
2250
2251 if (pci_enable_device(pdev)) {
2252 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2253 return PCI_ERS_RESULT_DISCONNECT;
2254 }
2255
2256 /* Perform card reset only on one instance of the card */
2257 if (0 != PCI_FUNC (pdev->devfn))
2258 return PCI_ERS_RESULT_RECOVERED;
2259
2260 pci_set_master(pdev);
2261
2262 netif_carrier_off(netdev);
2263 netif_stop_queue(netdev);
2264 ixgb_reset(adapter);
2265
2266 /* Make sure the EEPROM is good */
2267 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2268 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2269 return PCI_ERS_RESULT_DISCONNECT;
2270 }
2271 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2272 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2273
2274 if (!is_valid_ether_addr(netdev->perm_addr)) {
2275 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2276 return PCI_ERS_RESULT_DISCONNECT;
2277 }
2278
2279 return PCI_ERS_RESULT_RECOVERED;
2280 }
2281
2282 /**
2283 * ixgb_io_resume - called when its OK to resume normal operations
2284 * @pdev pointer to pci device with error
2285 *
2286 * The error recovery driver tells us that its OK to resume
2287 * normal operation. Implementation resembles the second-half
2288 * of the ixgb_probe() routine.
2289 */
2290 static void ixgb_io_resume(struct pci_dev *pdev)
2291 {
2292 struct net_device *netdev = pci_get_drvdata(pdev);
2293 struct ixgb_adapter *adapter = netdev_priv(netdev);
2294
2295 pci_set_master(pdev);
2296
2297 if (netif_running(netdev)) {
2298 if (ixgb_up(adapter)) {
2299 printk ("ixgb: can't bring device back up after reset\n");
2300 return;
2301 }
2302 }
2303
2304 netif_device_attach(netdev);
2305 mod_timer(&adapter->watchdog_timer, jiffies);
2306 }
2307
2308 /* ixgb_main.c */
Linux kernel - Deliverables
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