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x86/amd-iommu: Add function to complete a tlb flush
[linux/fpc-iii.git] / drivers / net / ixgb / ixgb_main.c
blob8aa44dca57ebc85f021dd52ad1a6ca118ad937d3
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 netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
85 struct net_device *netdev);
86 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
87 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
88 static int ixgb_set_mac(struct net_device *netdev, void *p);
89 static irqreturn_t ixgb_intr(int irq, void *data);
90 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
91
92 static int ixgb_clean(struct napi_struct *, int);
93 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
94 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
95
96 static void ixgb_tx_timeout(struct net_device *dev);
97 static void ixgb_tx_timeout_task(struct work_struct *work);
98
99 static void ixgb_vlan_rx_register(struct net_device *netdev,
100 struct vlan_group *grp);
101 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
102 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
103 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
104
105 #ifdef CONFIG_NET_POLL_CONTROLLER
106 /* for netdump / net console */
107 static void ixgb_netpoll(struct net_device *dev);
108 #endif
109
110 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
111 enum pci_channel_state state);
112 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
113 static void ixgb_io_resume (struct pci_dev *pdev);
114
115 static struct pci_error_handlers ixgb_err_handler = {
116 .error_detected = ixgb_io_error_detected,
117 .slot_reset = ixgb_io_slot_reset,
118 .resume = ixgb_io_resume,
119 };
120
121 static struct pci_driver ixgb_driver = {
122 .name = ixgb_driver_name,
123 .id_table = ixgb_pci_tbl,
124 .probe = ixgb_probe,
125 .remove = __devexit_p(ixgb_remove),
126 .err_handler = &ixgb_err_handler
127 };
128
129 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
130 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
131 MODULE_LICENSE("GPL");
132 MODULE_VERSION(DRV_VERSION);
133
134 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
135 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
136 module_param(debug, int, 0);
137 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
138
139 /**
140 * ixgb_init_module - Driver Registration Routine
141 *
142 * ixgb_init_module is the first routine called when the driver is
143 * loaded. All it does is register with the PCI subsystem.
144 **/
145
146 static int __init
147 ixgb_init_module(void)
148 {
149 printk(KERN_INFO "%s - version %s\n",
150 ixgb_driver_string, ixgb_driver_version);
151
152 printk(KERN_INFO "%s\n", ixgb_copyright);
153
154 return pci_register_driver(&ixgb_driver);
155 }
156
157 module_init(ixgb_init_module);
158
159 /**
160 * ixgb_exit_module - Driver Exit Cleanup Routine
161 *
162 * ixgb_exit_module is called just before the driver is removed
163 * from memory.
164 **/
165
166 static void __exit
167 ixgb_exit_module(void)
168 {
169 pci_unregister_driver(&ixgb_driver);
170 }
171
172 module_exit(ixgb_exit_module);
173
174 /**
175 * ixgb_irq_disable - Mask off interrupt generation on the NIC
176 * @adapter: board private structure
177 **/
178
179 static void
180 ixgb_irq_disable(struct ixgb_adapter *adapter)
181 {
182 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
183 IXGB_WRITE_FLUSH(&adapter->hw);
184 synchronize_irq(adapter->pdev->irq);
185 }
186
187 /**
188 * ixgb_irq_enable - Enable default interrupt generation settings
189 * @adapter: board private structure
190 **/
191
192 static void
193 ixgb_irq_enable(struct ixgb_adapter *adapter)
194 {
195 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
196 IXGB_INT_TXDW | IXGB_INT_LSC;
197 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
198 val |= IXGB_INT_GPI0;
199 IXGB_WRITE_REG(&adapter->hw, IMS, val);
200 IXGB_WRITE_FLUSH(&adapter->hw);
201 }
202
203 int
204 ixgb_up(struct ixgb_adapter *adapter)
205 {
206 struct net_device *netdev = adapter->netdev;
207 int err, irq_flags = IRQF_SHARED;
208 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
209 struct ixgb_hw *hw = &adapter->hw;
210
211 /* hardware has been reset, we need to reload some things */
212
213 ixgb_rar_set(hw, netdev->dev_addr, 0);
214 ixgb_set_multi(netdev);
215
216 ixgb_restore_vlan(adapter);
217
218 ixgb_configure_tx(adapter);
219 ixgb_setup_rctl(adapter);
220 ixgb_configure_rx(adapter);
221 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
222
223 /* disable interrupts and get the hardware into a known state */
224 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
225
226 /* only enable MSI if bus is in PCI-X mode */
227 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
228 err = pci_enable_msi(adapter->pdev);
229 if (!err) {
230 adapter->have_msi = 1;
231 irq_flags = 0;
232 }
233 /* proceed to try to request regular interrupt */
234 }
235
236 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
237 netdev->name, netdev);
238 if (err) {
239 if (adapter->have_msi)
240 pci_disable_msi(adapter->pdev);
241 DPRINTK(PROBE, ERR,
242 "Unable to allocate interrupt Error: %d\n", err);
243 return err;
244 }
245
246 if ((hw->max_frame_size != max_frame) ||
247 (hw->max_frame_size !=
248 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
249
250 hw->max_frame_size = max_frame;
251
252 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
253
254 if (hw->max_frame_size >
255 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
256 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
257
258 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
259 ctrl0 |= IXGB_CTRL0_JFE;
260 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
261 }
262 }
263 }
264
265 clear_bit(__IXGB_DOWN, &adapter->flags);
266
267 napi_enable(&adapter->napi);
268 ixgb_irq_enable(adapter);
269
270 netif_wake_queue(netdev);
271
272 mod_timer(&adapter->watchdog_timer, jiffies);
273
274 return 0;
275 }
276
277 void
278 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
279 {
280 struct net_device *netdev = adapter->netdev;
281
282 /* prevent the interrupt handler from restarting watchdog */
283 set_bit(__IXGB_DOWN, &adapter->flags);
284
285 napi_disable(&adapter->napi);
286 /* waiting for NAPI to complete can re-enable interrupts */
287 ixgb_irq_disable(adapter);
288 free_irq(adapter->pdev->irq, netdev);
289
290 if (adapter->have_msi)
291 pci_disable_msi(adapter->pdev);
292
293 if (kill_watchdog)
294 del_timer_sync(&adapter->watchdog_timer);
295
296 adapter->link_speed = 0;
297 adapter->link_duplex = 0;
298 netif_carrier_off(netdev);
299 netif_stop_queue(netdev);
300
301 ixgb_reset(adapter);
302 ixgb_clean_tx_ring(adapter);
303 ixgb_clean_rx_ring(adapter);
304 }
305
306 void
307 ixgb_reset(struct ixgb_adapter *adapter)
308 {
309 struct ixgb_hw *hw = &adapter->hw;
310
311 ixgb_adapter_stop(hw);
312 if (!ixgb_init_hw(hw))
313 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
314
315 /* restore frame size information */
316 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
317 if (hw->max_frame_size >
318 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
319 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
320 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
321 ctrl0 |= IXGB_CTRL0_JFE;
322 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
323 }
324 }
325 }
326
327 static const struct net_device_ops ixgb_netdev_ops = {
328 .ndo_open = ixgb_open,
329 .ndo_stop = ixgb_close,
330 .ndo_start_xmit = ixgb_xmit_frame,
331 .ndo_get_stats = ixgb_get_stats,
332 .ndo_set_multicast_list = ixgb_set_multi,
333 .ndo_validate_addr = eth_validate_addr,
334 .ndo_set_mac_address = ixgb_set_mac,
335 .ndo_change_mtu = ixgb_change_mtu,
336 .ndo_tx_timeout = ixgb_tx_timeout,
337 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
338 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
339 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
340 #ifdef CONFIG_NET_POLL_CONTROLLER
341 .ndo_poll_controller = ixgb_netpoll,
342 #endif
343 };
344
345 /**
346 * ixgb_probe - Device Initialization Routine
347 * @pdev: PCI device information struct
348 * @ent: entry in ixgb_pci_tbl
349 *
350 * Returns 0 on success, negative on failure
351 *
352 * ixgb_probe initializes an adapter identified by a pci_dev structure.
353 * The OS initialization, configuring of the adapter private structure,
354 * and a hardware reset occur.
355 **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
359 {
360 struct net_device *netdev = NULL;
361 struct ixgb_adapter *adapter;
362 static int cards_found = 0;
363 int pci_using_dac;
364 int i;
365 int err;
366
367 err = pci_enable_device(pdev);
368 if (err)
369 return err;
370
371 if (!(err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) &&
372 !(err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))) {
373 pci_using_dac = 1;
374 } else {
375 if ((err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) ||
376 (err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))) {
377 printk(KERN_ERR
378 "ixgb: No usable DMA configuration, aborting\n");
379 goto err_dma_mask;
380 }
381 pci_using_dac = 0;
382 }
383
384 err = pci_request_regions(pdev, ixgb_driver_name);
385 if (err)
386 goto err_request_regions;
387
388 pci_set_master(pdev);
389
390 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
391 if (!netdev) {
392 err = -ENOMEM;
393 goto err_alloc_etherdev;
394 }
395
396 SET_NETDEV_DEV(netdev, &pdev->dev);
397
398 pci_set_drvdata(pdev, netdev);
399 adapter = netdev_priv(netdev);
400 adapter->netdev = netdev;
401 adapter->pdev = pdev;
402 adapter->hw.back = adapter;
403 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
404
405 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
406 if (!adapter->hw.hw_addr) {
407 err = -EIO;
408 goto err_ioremap;
409 }
410
411 for (i = BAR_1; i <= BAR_5; i++) {
412 if (pci_resource_len(pdev, i) == 0)
413 continue;
414 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
415 adapter->hw.io_base = pci_resource_start(pdev, i);
416 break;
417 }
418 }
419
420 netdev->netdev_ops = &ixgb_netdev_ops;
421 ixgb_set_ethtool_ops(netdev);
422 netdev->watchdog_timeo = 5 * HZ;
423 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
424
425 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
426
427 adapter->bd_number = cards_found;
428 adapter->link_speed = 0;
429 adapter->link_duplex = 0;
430
431 /* setup the private structure */
432
433 err = ixgb_sw_init(adapter);
434 if (err)
435 goto err_sw_init;
436
437 netdev->features = NETIF_F_SG |
438 NETIF_F_HW_CSUM |
439 NETIF_F_HW_VLAN_TX |
440 NETIF_F_HW_VLAN_RX |
441 NETIF_F_HW_VLAN_FILTER;
442 netdev->features |= NETIF_F_TSO;
443
444 if (pci_using_dac)
445 netdev->features |= NETIF_F_HIGHDMA;
446
447 /* make sure the EEPROM is good */
448
449 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
450 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
451 err = -EIO;
452 goto err_eeprom;
453 }
454
455 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
456 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
457
458 if (!is_valid_ether_addr(netdev->perm_addr)) {
459 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
460 err = -EIO;
461 goto err_eeprom;
462 }
463
464 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
465
466 init_timer(&adapter->watchdog_timer);
467 adapter->watchdog_timer.function = &ixgb_watchdog;
468 adapter->watchdog_timer.data = (unsigned long)adapter;
469
470 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
471
472 strcpy(netdev->name, "eth%d");
473 err = register_netdev(netdev);
474 if (err)
475 goto err_register;
476
477 /* carrier off reporting is important to ethtool even BEFORE open */
478 netif_carrier_off(netdev);
479
480 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
481 ixgb_check_options(adapter);
482 /* reset the hardware with the new settings */
483
484 ixgb_reset(adapter);
485
486 cards_found++;
487 return 0;
488
489 err_register:
490 err_sw_init:
491 err_eeprom:
492 iounmap(adapter->hw.hw_addr);
493 err_ioremap:
494 free_netdev(netdev);
495 err_alloc_etherdev:
496 pci_release_regions(pdev);
497 err_request_regions:
498 err_dma_mask:
499 pci_disable_device(pdev);
500 return err;
501 }
502
503 /**
504 * ixgb_remove - Device Removal Routine
505 * @pdev: PCI device information struct
506 *
507 * ixgb_remove is called by the PCI subsystem to alert the driver
508 * that it should release a PCI device. The could be caused by a
509 * Hot-Plug event, or because the driver is going to be removed from
510 * memory.
511 **/
512
513 static void __devexit
514 ixgb_remove(struct pci_dev *pdev)
515 {
516 struct net_device *netdev = pci_get_drvdata(pdev);
517 struct ixgb_adapter *adapter = netdev_priv(netdev);
518
519 flush_scheduled_work();
520
521 unregister_netdev(netdev);
522
523 iounmap(adapter->hw.hw_addr);
524 pci_release_regions(pdev);
525
526 free_netdev(netdev);
527 }
528
529 /**
530 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
531 * @adapter: board private structure to initialize
532 *
533 * ixgb_sw_init initializes the Adapter private data structure.
534 * Fields are initialized based on PCI device information and
535 * OS network device settings (MTU size).
536 **/
537
538 static int __devinit
539 ixgb_sw_init(struct ixgb_adapter *adapter)
540 {
541 struct ixgb_hw *hw = &adapter->hw;
542 struct net_device *netdev = adapter->netdev;
543 struct pci_dev *pdev = adapter->pdev;
544
545 /* PCI config space info */
546
547 hw->vendor_id = pdev->vendor;
548 hw->device_id = pdev->device;
549 hw->subsystem_vendor_id = pdev->subsystem_vendor;
550 hw->subsystem_id = pdev->subsystem_device;
551
552 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
553 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
554
555 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
556 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
557 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
558 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
559 hw->mac_type = ixgb_82597;
560 else {
561 /* should never have loaded on this device */
562 DPRINTK(PROBE, ERR, "unsupported device id\n");
563 }
564
565 /* enable flow control to be programmed */
566 hw->fc.send_xon = 1;
567
568 set_bit(__IXGB_DOWN, &adapter->flags);
569 return 0;
570 }
571
572 /**
573 * ixgb_open - Called when a network interface is made active
574 * @netdev: network interface device structure
575 *
576 * Returns 0 on success, negative value on failure
577 *
578 * The open entry point is called when a network interface is made
579 * active by the system (IFF_UP). At this point all resources needed
580 * for transmit and receive operations are allocated, the interrupt
581 * handler is registered with the OS, the watchdog timer is started,
582 * and the stack is notified that the interface is ready.
583 **/
584
585 static int
586 ixgb_open(struct net_device *netdev)
587 {
588 struct ixgb_adapter *adapter = netdev_priv(netdev);
589 int err;
590
591 /* allocate transmit descriptors */
592 err = ixgb_setup_tx_resources(adapter);
593 if (err)
594 goto err_setup_tx;
595
596 netif_carrier_off(netdev);
597
598 /* allocate receive descriptors */
599
600 err = ixgb_setup_rx_resources(adapter);
601 if (err)
602 goto err_setup_rx;
603
604 err = ixgb_up(adapter);
605 if (err)
606 goto err_up;
607
608 netif_start_queue(netdev);
609
610 return 0;
611
612 err_up:
613 ixgb_free_rx_resources(adapter);
614 err_setup_rx:
615 ixgb_free_tx_resources(adapter);
616 err_setup_tx:
617 ixgb_reset(adapter);
618
619 return err;
620 }
621
622 /**
623 * ixgb_close - Disables a network interface
624 * @netdev: network interface device structure
625 *
626 * Returns 0, this is not allowed to fail
627 *
628 * The close entry point is called when an interface is de-activated
629 * by the OS. The hardware is still under the drivers control, but
630 * needs to be disabled. A global MAC reset is issued to stop the
631 * hardware, and all transmit and receive resources are freed.
632 **/
633
634 static int
635 ixgb_close(struct net_device *netdev)
636 {
637 struct ixgb_adapter *adapter = netdev_priv(netdev);
638
639 ixgb_down(adapter, true);
640
641 ixgb_free_tx_resources(adapter);
642 ixgb_free_rx_resources(adapter);
643
644 return 0;
645 }
646
647 /**
648 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
649 * @adapter: board private structure
650 *
651 * Return 0 on success, negative on failure
652 **/
653
654 int
655 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
656 {
657 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
658 struct pci_dev *pdev = adapter->pdev;
659 int size;
660
661 size = sizeof(struct ixgb_buffer) * txdr->count;
662 txdr->buffer_info = vmalloc(size);
663 if (!txdr->buffer_info) {
664 DPRINTK(PROBE, ERR,
665 "Unable to allocate transmit descriptor ring memory\n");
666 return -ENOMEM;
667 }
668 memset(txdr->buffer_info, 0, size);
669
670 /* round up to nearest 4K */
671
672 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
673 txdr->size = ALIGN(txdr->size, 4096);
674
675 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
676 if (!txdr->desc) {
677 vfree(txdr->buffer_info);
678 DPRINTK(PROBE, ERR,
679 "Unable to allocate transmit descriptor memory\n");
680 return -ENOMEM;
681 }
682 memset(txdr->desc, 0, txdr->size);
683
684 txdr->next_to_use = 0;
685 txdr->next_to_clean = 0;
686
687 return 0;
688 }
689
690 /**
691 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
692 * @adapter: board private structure
693 *
694 * Configure the Tx unit of the MAC after a reset.
695 **/
696
697 static void
698 ixgb_configure_tx(struct ixgb_adapter *adapter)
699 {
700 u64 tdba = adapter->tx_ring.dma;
701 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
702 u32 tctl;
703 struct ixgb_hw *hw = &adapter->hw;
704
705 /* Setup the Base and Length of the Tx Descriptor Ring
706 * tx_ring.dma can be either a 32 or 64 bit value
707 */
708
709 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
710 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
711
712 IXGB_WRITE_REG(hw, TDLEN, tdlen);
713
714 /* Setup the HW Tx Head and Tail descriptor pointers */
715
716 IXGB_WRITE_REG(hw, TDH, 0);
717 IXGB_WRITE_REG(hw, TDT, 0);
718
719 /* don't set up txdctl, it induces performance problems if configured
720 * incorrectly */
721 /* Set the Tx Interrupt Delay register */
722
723 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
724
725 /* Program the Transmit Control Register */
726
727 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
728 IXGB_WRITE_REG(hw, TCTL, tctl);
729
730 /* Setup Transmit Descriptor Settings for this adapter */
731 adapter->tx_cmd_type =
732 IXGB_TX_DESC_TYPE |
733 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
734 }
735
736 /**
737 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
738 * @adapter: board private structure
739 *
740 * Returns 0 on success, negative on failure
741 **/
742
743 int
744 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
745 {
746 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
747 struct pci_dev *pdev = adapter->pdev;
748 int size;
749
750 size = sizeof(struct ixgb_buffer) * rxdr->count;
751 rxdr->buffer_info = vmalloc(size);
752 if (!rxdr->buffer_info) {
753 DPRINTK(PROBE, ERR,
754 "Unable to allocate receive descriptor ring\n");
755 return -ENOMEM;
756 }
757 memset(rxdr->buffer_info, 0, size);
758
759 /* Round up to nearest 4K */
760
761 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
762 rxdr->size = ALIGN(rxdr->size, 4096);
763
764 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
765
766 if (!rxdr->desc) {
767 vfree(rxdr->buffer_info);
768 DPRINTK(PROBE, ERR,
769 "Unable to allocate receive descriptors\n");
770 return -ENOMEM;
771 }
772 memset(rxdr->desc, 0, rxdr->size);
773
774 rxdr->next_to_clean = 0;
775 rxdr->next_to_use = 0;
776
777 return 0;
778 }
779
780 /**
781 * ixgb_setup_rctl - configure the receive control register
782 * @adapter: Board private structure
783 **/
784
785 static void
786 ixgb_setup_rctl(struct ixgb_adapter *adapter)
787 {
788 u32 rctl;
789
790 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
791
792 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
793
794 rctl |=
795 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
796 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
797 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
798
799 rctl |= IXGB_RCTL_SECRC;
800
801 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
802 rctl |= IXGB_RCTL_BSIZE_2048;
803 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
804 rctl |= IXGB_RCTL_BSIZE_4096;
805 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
806 rctl |= IXGB_RCTL_BSIZE_8192;
807 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
808 rctl |= IXGB_RCTL_BSIZE_16384;
809
810 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
811 }
812
813 /**
814 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
815 * @adapter: board private structure
816 *
817 * Configure the Rx unit of the MAC after a reset.
818 **/
819
820 static void
821 ixgb_configure_rx(struct ixgb_adapter *adapter)
822 {
823 u64 rdba = adapter->rx_ring.dma;
824 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
825 struct ixgb_hw *hw = &adapter->hw;
826 u32 rctl;
827 u32 rxcsum;
828
829 /* make sure receives are disabled while setting up the descriptors */
830
831 rctl = IXGB_READ_REG(hw, RCTL);
832 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
833
834 /* set the Receive Delay Timer Register */
835
836 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
837
838 /* Setup the Base and Length of the Rx Descriptor Ring */
839
840 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
841 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
842
843 IXGB_WRITE_REG(hw, RDLEN, rdlen);
844
845 /* Setup the HW Rx Head and Tail Descriptor Pointers */
846 IXGB_WRITE_REG(hw, RDH, 0);
847 IXGB_WRITE_REG(hw, RDT, 0);
848
849 /* due to the hardware errata with RXDCTL, we are unable to use any of
850 * the performance enhancing features of it without causing other
851 * subtle bugs, some of the bugs could include receive length
852 * corruption at high data rates (WTHRESH > 0) and/or receive
853 * descriptor ring irregularites (particularly in hardware cache) */
854 IXGB_WRITE_REG(hw, RXDCTL, 0);
855
856 /* Enable Receive Checksum Offload for TCP and UDP */
857 if (adapter->rx_csum) {
858 rxcsum = IXGB_READ_REG(hw, RXCSUM);
859 rxcsum |= IXGB_RXCSUM_TUOFL;
860 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
861 }
862
863 /* Enable Receives */
864
865 IXGB_WRITE_REG(hw, RCTL, rctl);
866 }
867
868 /**
869 * ixgb_free_tx_resources - Free Tx Resources
870 * @adapter: board private structure
871 *
872 * Free all transmit software resources
873 **/
874
875 void
876 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
877 {
878 struct pci_dev *pdev = adapter->pdev;
879
880 ixgb_clean_tx_ring(adapter);
881
882 vfree(adapter->tx_ring.buffer_info);
883 adapter->tx_ring.buffer_info = NULL;
884
885 pci_free_consistent(pdev, adapter->tx_ring.size,
886 adapter->tx_ring.desc, adapter->tx_ring.dma);
887
888 adapter->tx_ring.desc = NULL;
889 }
890
891 static void
892 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
893 struct ixgb_buffer *buffer_info)
894 {
895 buffer_info->dma = 0;
896 if (buffer_info->skb) {
897 skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
898 DMA_TO_DEVICE);
899 dev_kfree_skb_any(buffer_info->skb);
900 buffer_info->skb = NULL;
901 }
902 buffer_info->time_stamp = 0;
903 /* these fields must always be initialized in tx
904 * buffer_info->length = 0;
905 * buffer_info->next_to_watch = 0; */
906 }
907
908 /**
909 * ixgb_clean_tx_ring - Free Tx Buffers
910 * @adapter: board private structure
911 **/
912
913 static void
914 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
915 {
916 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
917 struct ixgb_buffer *buffer_info;
918 unsigned long size;
919 unsigned int i;
920
921 /* Free all the Tx ring sk_buffs */
922
923 for (i = 0; i < tx_ring->count; i++) {
924 buffer_info = &tx_ring->buffer_info[i];
925 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
926 }
927
928 size = sizeof(struct ixgb_buffer) * tx_ring->count;
929 memset(tx_ring->buffer_info, 0, size);
930
931 /* Zero out the descriptor ring */
932
933 memset(tx_ring->desc, 0, tx_ring->size);
934
935 tx_ring->next_to_use = 0;
936 tx_ring->next_to_clean = 0;
937
938 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
939 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
940 }
941
942 /**
943 * ixgb_free_rx_resources - Free Rx Resources
944 * @adapter: board private structure
945 *
946 * Free all receive software resources
947 **/
948
949 void
950 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
951 {
952 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
953 struct pci_dev *pdev = adapter->pdev;
954
955 ixgb_clean_rx_ring(adapter);
956
957 vfree(rx_ring->buffer_info);
958 rx_ring->buffer_info = NULL;
959
960 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
961
962 rx_ring->desc = NULL;
963 }
964
965 /**
966 * ixgb_clean_rx_ring - Free Rx Buffers
967 * @adapter: board private structure
968 **/
969
970 static void
971 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
972 {
973 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
974 struct ixgb_buffer *buffer_info;
975 struct pci_dev *pdev = adapter->pdev;
976 unsigned long size;
977 unsigned int i;
978
979 /* Free all the Rx ring sk_buffs */
980
981 for (i = 0; i < rx_ring->count; i++) {
982 buffer_info = &rx_ring->buffer_info[i];
983 if (buffer_info->dma) {
984 pci_unmap_single(pdev,
985 buffer_info->dma,
986 buffer_info->length,
987 PCI_DMA_FROMDEVICE);
988 buffer_info->dma = 0;
989 buffer_info->length = 0;
990 }
991
992 if (buffer_info->skb) {
993 dev_kfree_skb(buffer_info->skb);
994 buffer_info->skb = NULL;
995 }
996 }
997
998 size = sizeof(struct ixgb_buffer) * rx_ring->count;
999 memset(rx_ring->buffer_info, 0, size);
1000
1001 /* Zero out the descriptor ring */
1002
1003 memset(rx_ring->desc, 0, rx_ring->size);
1004
1005 rx_ring->next_to_clean = 0;
1006 rx_ring->next_to_use = 0;
1007
1008 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1009 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1010 }
1011
1012 /**
1013 * ixgb_set_mac - Change the Ethernet Address of the NIC
1014 * @netdev: network interface device structure
1015 * @p: pointer to an address structure
1016 *
1017 * Returns 0 on success, negative on failure
1018 **/
1019
1020 static int
1021 ixgb_set_mac(struct net_device *netdev, void *p)
1022 {
1023 struct ixgb_adapter *adapter = netdev_priv(netdev);
1024 struct sockaddr *addr = p;
1025
1026 if (!is_valid_ether_addr(addr->sa_data))
1027 return -EADDRNOTAVAIL;
1028
1029 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1030
1031 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1032
1033 return 0;
1034 }
1035
1036 /**
1037 * ixgb_set_multi - Multicast and Promiscuous mode set
1038 * @netdev: network interface device structure
1039 *
1040 * The set_multi entry point is called whenever the multicast address
1041 * list or the network interface flags are updated. This routine is
1042 * responsible for configuring the hardware for proper multicast,
1043 * promiscuous mode, and all-multi behavior.
1044 **/
1045
1046 static void
1047 ixgb_set_multi(struct net_device *netdev)
1048 {
1049 struct ixgb_adapter *adapter = netdev_priv(netdev);
1050 struct ixgb_hw *hw = &adapter->hw;
1051 struct dev_mc_list *mc_ptr;
1052 u32 rctl;
1053 int i;
1054
1055 /* Check for Promiscuous and All Multicast modes */
1056
1057 rctl = IXGB_READ_REG(hw, RCTL);
1058
1059 if (netdev->flags & IFF_PROMISC) {
1060 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1061 rctl &= ~IXGB_RCTL_VFE;
1062 } else {
1063 if (netdev->flags & IFF_ALLMULTI) {
1064 rctl |= IXGB_RCTL_MPE;
1065 rctl &= ~IXGB_RCTL_UPE;
1066 } else {
1067 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1068 }
1069 rctl |= IXGB_RCTL_VFE;
1070 }
1071
1072 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1073 rctl |= IXGB_RCTL_MPE;
1074 IXGB_WRITE_REG(hw, RCTL, rctl);
1075 } else {
1076 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1077 IXGB_ETH_LENGTH_OF_ADDRESS];
1078
1079 IXGB_WRITE_REG(hw, RCTL, rctl);
1080
1081 for (i = 0, mc_ptr = netdev->mc_list;
1082 mc_ptr;
1083 i++, mc_ptr = mc_ptr->next)
1084 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1085 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1086
1087 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1088 }
1089 }
1090
1091 /**
1092 * ixgb_watchdog - Timer Call-back
1093 * @data: pointer to netdev cast into an unsigned long
1094 **/
1095
1096 static void
1097 ixgb_watchdog(unsigned long data)
1098 {
1099 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1100 struct net_device *netdev = adapter->netdev;
1101 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1102
1103 ixgb_check_for_link(&adapter->hw);
1104
1105 if (ixgb_check_for_bad_link(&adapter->hw)) {
1106 /* force the reset path */
1107 netif_stop_queue(netdev);
1108 }
1109
1110 if (adapter->hw.link_up) {
1111 if (!netif_carrier_ok(netdev)) {
1112 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1113 "Full Duplex, Flow Control: %s\n",
1114 netdev->name,
1115 (adapter->hw.fc.type == ixgb_fc_full) ?
1116 "RX/TX" :
1117 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1118 "RX" :
1119 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1120 "TX" : "None")));
1121 adapter->link_speed = 10000;
1122 adapter->link_duplex = FULL_DUPLEX;
1123 netif_carrier_on(netdev);
1124 }
1125 } else {
1126 if (netif_carrier_ok(netdev)) {
1127 adapter->link_speed = 0;
1128 adapter->link_duplex = 0;
1129 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1130 netdev->name);
1131 netif_carrier_off(netdev);
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 /* return immediately since reset is imminent */
1145 return;
1146 }
1147 }
1148
1149 /* Force detection of hung controller every watchdog period */
1150 adapter->detect_tx_hung = true;
1151
1152 /* generate an interrupt to force clean up of any stragglers */
1153 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1154
1155 /* Reset the timer */
1156 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1157 }
1158
1159 #define IXGB_TX_FLAGS_CSUM 0x00000001
1160 #define IXGB_TX_FLAGS_VLAN 0x00000002
1161 #define IXGB_TX_FLAGS_TSO 0x00000004
1162
1163 static int
1164 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1165 {
1166 struct ixgb_context_desc *context_desc;
1167 unsigned int i;
1168 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1169 u16 ipcse, tucse, mss;
1170 int err;
1171
1172 if (likely(skb_is_gso(skb))) {
1173 struct ixgb_buffer *buffer_info;
1174 struct iphdr *iph;
1175
1176 if (skb_header_cloned(skb)) {
1177 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1178 if (err)
1179 return err;
1180 }
1181
1182 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1183 mss = skb_shinfo(skb)->gso_size;
1184 iph = ip_hdr(skb);
1185 iph->tot_len = 0;
1186 iph->check = 0;
1187 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1188 iph->daddr, 0,
1189 IPPROTO_TCP, 0);
1190 ipcss = skb_network_offset(skb);
1191 ipcso = (void *)&(iph->check) - (void *)skb->data;
1192 ipcse = skb_transport_offset(skb) - 1;
1193 tucss = skb_transport_offset(skb);
1194 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1195 tucse = 0;
1196
1197 i = adapter->tx_ring.next_to_use;
1198 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1199 buffer_info = &adapter->tx_ring.buffer_info[i];
1200 WARN_ON(buffer_info->dma != 0);
1201
1202 context_desc->ipcss = ipcss;
1203 context_desc->ipcso = ipcso;
1204 context_desc->ipcse = cpu_to_le16(ipcse);
1205 context_desc->tucss = tucss;
1206 context_desc->tucso = tucso;
1207 context_desc->tucse = cpu_to_le16(tucse);
1208 context_desc->mss = cpu_to_le16(mss);
1209 context_desc->hdr_len = hdr_len;
1210 context_desc->status = 0;
1211 context_desc->cmd_type_len = cpu_to_le32(
1212 IXGB_CONTEXT_DESC_TYPE
1213 | IXGB_CONTEXT_DESC_CMD_TSE
1214 | IXGB_CONTEXT_DESC_CMD_IP
1215 | IXGB_CONTEXT_DESC_CMD_TCP
1216 | IXGB_CONTEXT_DESC_CMD_IDE
1217 | (skb->len - (hdr_len)));
1218
1219
1220 if (++i == adapter->tx_ring.count) i = 0;
1221 adapter->tx_ring.next_to_use = i;
1222
1223 return 1;
1224 }
1225
1226 return 0;
1227 }
1228
1229 static bool
1230 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1231 {
1232 struct ixgb_context_desc *context_desc;
1233 unsigned int i;
1234 u8 css, cso;
1235
1236 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1237 struct ixgb_buffer *buffer_info;
1238 css = skb_transport_offset(skb);
1239 cso = css + skb->csum_offset;
1240
1241 i = adapter->tx_ring.next_to_use;
1242 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1243 buffer_info = &adapter->tx_ring.buffer_info[i];
1244 WARN_ON(buffer_info->dma != 0);
1245
1246 context_desc->tucss = css;
1247 context_desc->tucso = cso;
1248 context_desc->tucse = 0;
1249 /* zero out any previously existing data in one instruction */
1250 *(u32 *)&(context_desc->ipcss) = 0;
1251 context_desc->status = 0;
1252 context_desc->hdr_len = 0;
1253 context_desc->mss = 0;
1254 context_desc->cmd_type_len =
1255 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1256 | IXGB_TX_DESC_CMD_IDE);
1257
1258 if (++i == adapter->tx_ring.count) i = 0;
1259 adapter->tx_ring.next_to_use = i;
1260
1261 return true;
1262 }
1263
1264 return false;
1265 }
1266
1267 #define IXGB_MAX_TXD_PWR 14
1268 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1269
1270 static int
1271 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1272 unsigned int first)
1273 {
1274 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1275 struct ixgb_buffer *buffer_info;
1276 int len = skb_headlen(skb);
1277 unsigned int offset = 0, size, count = 0, i;
1278 unsigned int mss = skb_shinfo(skb)->gso_size;
1279
1280 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1281 unsigned int f;
1282 dma_addr_t *map;
1283
1284 i = tx_ring->next_to_use;
1285
1286 if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
1287 dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
1288 return 0;
1289 }
1290
1291 map = skb_shinfo(skb)->dma_maps;
1292
1293 while (len) {
1294 buffer_info = &tx_ring->buffer_info[i];
1295 size = min(len, IXGB_MAX_DATA_PER_TXD);
1296 /* Workaround for premature desc write-backs
1297 * in TSO mode. Append 4-byte sentinel desc */
1298 if (unlikely(mss && !nr_frags && size == len && size > 8))
1299 size -= 4;
1300
1301 buffer_info->length = size;
1302 WARN_ON(buffer_info->dma != 0);
1303 buffer_info->time_stamp = jiffies;
1304 buffer_info->dma = skb_shinfo(skb)->dma_head + offset;
1305 pci_map_single(adapter->pdev,
1306 skb->data + offset,
1307 size,
1308 PCI_DMA_TODEVICE);
1309 buffer_info->next_to_watch = 0;
1310
1311 len -= size;
1312 offset += size;
1313 count++;
1314 if (len) {
1315 i++;
1316 if (i == tx_ring->count)
1317 i = 0;
1318 }
1319 }
1320
1321 for (f = 0; f < nr_frags; f++) {
1322 struct skb_frag_struct *frag;
1323
1324 frag = &skb_shinfo(skb)->frags[f];
1325 len = frag->size;
1326 offset = 0;
1327
1328 while (len) {
1329 i++;
1330 if (i == tx_ring->count)
1331 i = 0;
1332
1333 buffer_info = &tx_ring->buffer_info[i];
1334 size = min(len, IXGB_MAX_DATA_PER_TXD);
1335
1336 /* Workaround for premature desc write-backs
1337 * in TSO mode. Append 4-byte sentinel desc */
1338 if (unlikely(mss && (f == (nr_frags - 1))
1339 && size == len && size > 8))
1340 size -= 4;
1341
1342 buffer_info->length = size;
1343 buffer_info->time_stamp = jiffies;
1344 buffer_info->dma = map[f] + offset;
1345 buffer_info->next_to_watch = 0;
1346
1347 len -= size;
1348 offset += size;
1349 count++;
1350 }
1351 }
1352 tx_ring->buffer_info[i].skb = skb;
1353 tx_ring->buffer_info[first].next_to_watch = i;
1354
1355 return count;
1356 }
1357
1358 static void
1359 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1360 {
1361 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1362 struct ixgb_tx_desc *tx_desc = NULL;
1363 struct ixgb_buffer *buffer_info;
1364 u32 cmd_type_len = adapter->tx_cmd_type;
1365 u8 status = 0;
1366 u8 popts = 0;
1367 unsigned int i;
1368
1369 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1370 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1371 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1372 }
1373
1374 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1375 popts |= IXGB_TX_DESC_POPTS_TXSM;
1376
1377 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1378 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1379
1380 i = tx_ring->next_to_use;
1381
1382 while (count--) {
1383 buffer_info = &tx_ring->buffer_info[i];
1384 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1385 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1386 tx_desc->cmd_type_len =
1387 cpu_to_le32(cmd_type_len | buffer_info->length);
1388 tx_desc->status = status;
1389 tx_desc->popts = popts;
1390 tx_desc->vlan = cpu_to_le16(vlan_id);
1391
1392 if (++i == tx_ring->count) i = 0;
1393 }
1394
1395 tx_desc->cmd_type_len |=
1396 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1397
1398 /* Force memory writes to complete before letting h/w
1399 * know there are new descriptors to fetch. (Only
1400 * applicable for weak-ordered memory model archs,
1401 * such as IA-64). */
1402 wmb();
1403
1404 tx_ring->next_to_use = i;
1405 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1406 }
1407
1408 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1409 {
1410 struct ixgb_adapter *adapter = netdev_priv(netdev);
1411 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1412
1413 netif_stop_queue(netdev);
1414 /* Herbert's original patch had:
1415 * smp_mb__after_netif_stop_queue();
1416 * but since that doesn't exist yet, just open code it. */
1417 smp_mb();
1418
1419 /* We need to check again in a case another CPU has just
1420 * made room available. */
1421 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1422 return -EBUSY;
1423
1424 /* A reprieve! */
1425 netif_start_queue(netdev);
1426 ++adapter->restart_queue;
1427 return 0;
1428 }
1429
1430 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1431 struct ixgb_desc_ring *tx_ring, int size)
1432 {
1433 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1434 return 0;
1435 return __ixgb_maybe_stop_tx(netdev, size);
1436 }
1437
1438
1439 /* Tx Descriptors needed, worst case */
1440 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1441 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1442 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1443 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1444 + 1 /* one more needed for sentinel TSO workaround */
1445
1446 static netdev_tx_t
1447 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1448 {
1449 struct ixgb_adapter *adapter = netdev_priv(netdev);
1450 unsigned int first;
1451 unsigned int tx_flags = 0;
1452 int vlan_id = 0;
1453 int count = 0;
1454 int tso;
1455
1456 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1457 dev_kfree_skb(skb);
1458 return NETDEV_TX_OK;
1459 }
1460
1461 if (skb->len <= 0) {
1462 dev_kfree_skb(skb);
1463 return NETDEV_TX_OK;
1464 }
1465
1466 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1467 DESC_NEEDED)))
1468 return NETDEV_TX_BUSY;
1469
1470 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1471 tx_flags |= IXGB_TX_FLAGS_VLAN;
1472 vlan_id = vlan_tx_tag_get(skb);
1473 }
1474
1475 first = adapter->tx_ring.next_to_use;
1476
1477 tso = ixgb_tso(adapter, skb);
1478 if (tso < 0) {
1479 dev_kfree_skb(skb);
1480 return NETDEV_TX_OK;
1481 }
1482
1483 if (likely(tso))
1484 tx_flags |= IXGB_TX_FLAGS_TSO;
1485 else if (ixgb_tx_csum(adapter, skb))
1486 tx_flags |= IXGB_TX_FLAGS_CSUM;
1487
1488 count = ixgb_tx_map(adapter, skb, first);
1489
1490 if (count) {
1491 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1492 /* Make sure there is space in the ring for the next send. */
1493 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1494
1495 } else {
1496 dev_kfree_skb_any(skb);
1497 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1498 adapter->tx_ring.next_to_use = first;
1499 }
1500
1501 return NETDEV_TX_OK;
1502 }
1503
1504 /**
1505 * ixgb_tx_timeout - Respond to a Tx Hang
1506 * @netdev: network interface device structure
1507 **/
1508
1509 static void
1510 ixgb_tx_timeout(struct net_device *netdev)
1511 {
1512 struct ixgb_adapter *adapter = netdev_priv(netdev);
1513
1514 /* Do the reset outside of interrupt context */
1515 schedule_work(&adapter->tx_timeout_task);
1516 }
1517
1518 static void
1519 ixgb_tx_timeout_task(struct work_struct *work)
1520 {
1521 struct ixgb_adapter *adapter =
1522 container_of(work, struct ixgb_adapter, tx_timeout_task);
1523
1524 adapter->tx_timeout_count++;
1525 ixgb_down(adapter, true);
1526 ixgb_up(adapter);
1527 }
1528
1529 /**
1530 * ixgb_get_stats - Get System Network Statistics
1531 * @netdev: network interface device structure
1532 *
1533 * Returns the address of the device statistics structure.
1534 * The statistics are actually updated from the timer callback.
1535 **/
1536
1537 static struct net_device_stats *
1538 ixgb_get_stats(struct net_device *netdev)
1539 {
1540 struct ixgb_adapter *adapter = netdev_priv(netdev);
1541
1542 return &adapter->net_stats;
1543 }
1544
1545 /**
1546 * ixgb_change_mtu - Change the Maximum Transfer Unit
1547 * @netdev: network interface device structure
1548 * @new_mtu: new value for maximum frame size
1549 *
1550 * Returns 0 on success, negative on failure
1551 **/
1552
1553 static int
1554 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1555 {
1556 struct ixgb_adapter *adapter = netdev_priv(netdev);
1557 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1558 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1559
1560 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1561 if ((new_mtu < 68) ||
1562 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1563 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1564 return -EINVAL;
1565 }
1566
1567 if (old_max_frame == max_frame)
1568 return 0;
1569
1570 if (netif_running(netdev))
1571 ixgb_down(adapter, true);
1572
1573 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1574
1575 netdev->mtu = new_mtu;
1576
1577 if (netif_running(netdev))
1578 ixgb_up(adapter);
1579
1580 return 0;
1581 }
1582
1583 /**
1584 * ixgb_update_stats - Update the board statistics counters.
1585 * @adapter: board private structure
1586 **/
1587
1588 void
1589 ixgb_update_stats(struct ixgb_adapter *adapter)
1590 {
1591 struct net_device *netdev = adapter->netdev;
1592 struct pci_dev *pdev = adapter->pdev;
1593
1594 /* Prevent stats update while adapter is being reset */
1595 if (pci_channel_offline(pdev))
1596 return;
1597
1598 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1599 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1600 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1601 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1602 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1603 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1604
1605 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1606 /* fix up multicast stats by removing broadcasts */
1607 if (multi >= bcast)
1608 multi -= bcast;
1609
1610 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1611 adapter->stats.mprch += (multi >> 32);
1612 adapter->stats.bprcl += bcast_l;
1613 adapter->stats.bprch += bcast_h;
1614 } else {
1615 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1616 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1617 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1618 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1619 }
1620 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1621 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1622 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1623 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1624 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1625 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1626 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1627 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1628 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1629 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1630 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1631 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1632 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1633 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1634 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1635 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1636 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1637 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1638 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1639 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1640 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1641 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1642 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1643 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1644 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1645 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1646 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1647 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1648 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1649 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1650 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1651 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1652 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1653 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1654 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1655 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1656 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1657 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1658 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1659 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1660 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1661 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1662 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1663 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1664 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1665 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1666 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1667 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1668 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1669 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1670 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1671 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1672 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1673 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1674 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1675 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1676
1677 /* Fill out the OS statistics structure */
1678
1679 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1680 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1681 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1682 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1683 adapter->net_stats.multicast = adapter->stats.mprcl;
1684 adapter->net_stats.collisions = 0;
1685
1686 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1687 * with a length in the type/len field */
1688 adapter->net_stats.rx_errors =
1689 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1690 adapter->stats.ruc +
1691 adapter->stats.roc /*+ adapter->stats.rlec */ +
1692 adapter->stats.icbc +
1693 adapter->stats.ecbc + adapter->stats.mpc;
1694
1695 /* see above
1696 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1697 */
1698
1699 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1700 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1701 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1702 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1703
1704 adapter->net_stats.tx_errors = 0;
1705 adapter->net_stats.rx_frame_errors = 0;
1706 adapter->net_stats.tx_aborted_errors = 0;
1707 adapter->net_stats.tx_carrier_errors = 0;
1708 adapter->net_stats.tx_fifo_errors = 0;
1709 adapter->net_stats.tx_heartbeat_errors = 0;
1710 adapter->net_stats.tx_window_errors = 0;
1711 }
1712
1713 #define IXGB_MAX_INTR 10
1714 /**
1715 * ixgb_intr - Interrupt Handler
1716 * @irq: interrupt number
1717 * @data: pointer to a network interface device structure
1718 **/
1719
1720 static irqreturn_t
1721 ixgb_intr(int irq, void *data)
1722 {
1723 struct net_device *netdev = data;
1724 struct ixgb_adapter *adapter = netdev_priv(netdev);
1725 struct ixgb_hw *hw = &adapter->hw;
1726 u32 icr = IXGB_READ_REG(hw, ICR);
1727
1728 if (unlikely(!icr))
1729 return IRQ_NONE; /* Not our interrupt */
1730
1731 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1732 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1733 mod_timer(&adapter->watchdog_timer, jiffies);
1734
1735 if (napi_schedule_prep(&adapter->napi)) {
1736
1737 /* Disable interrupts and register for poll. The flush
1738 of the posted write is intentionally left out.
1739 */
1740
1741 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1742 __napi_schedule(&adapter->napi);
1743 }
1744 return IRQ_HANDLED;
1745 }
1746
1747 /**
1748 * ixgb_clean - NAPI Rx polling callback
1749 * @adapter: board private structure
1750 **/
1751
1752 static int
1753 ixgb_clean(struct napi_struct *napi, int budget)
1754 {
1755 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1756 int work_done = 0;
1757
1758 ixgb_clean_tx_irq(adapter);
1759 ixgb_clean_rx_irq(adapter, &work_done, budget);
1760
1761 /* If budget not fully consumed, exit the polling mode */
1762 if (work_done < budget) {
1763 napi_complete(napi);
1764 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1765 ixgb_irq_enable(adapter);
1766 }
1767
1768 return work_done;
1769 }
1770
1771 /**
1772 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1773 * @adapter: board private structure
1774 **/
1775
1776 static bool
1777 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1778 {
1779 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1780 struct net_device *netdev = adapter->netdev;
1781 struct ixgb_tx_desc *tx_desc, *eop_desc;
1782 struct ixgb_buffer *buffer_info;
1783 unsigned int i, eop;
1784 bool cleaned = false;
1785
1786 i = tx_ring->next_to_clean;
1787 eop = tx_ring->buffer_info[i].next_to_watch;
1788 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1789
1790 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1791
1792 for (cleaned = false; !cleaned; ) {
1793 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1794 buffer_info = &tx_ring->buffer_info[i];
1795
1796 if (tx_desc->popts &
1797 (IXGB_TX_DESC_POPTS_TXSM |
1798 IXGB_TX_DESC_POPTS_IXSM))
1799 adapter->hw_csum_tx_good++;
1800
1801 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1802
1803 *(u32 *)&(tx_desc->status) = 0;
1804
1805 cleaned = (i == eop);
1806 if (++i == tx_ring->count) i = 0;
1807 }
1808
1809 eop = tx_ring->buffer_info[i].next_to_watch;
1810 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1811 }
1812
1813 tx_ring->next_to_clean = i;
1814
1815 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1816 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1817 /* Make sure that anybody stopping the queue after this
1818 * sees the new next_to_clean. */
1819 smp_mb();
1820
1821 if (netif_queue_stopped(netdev) &&
1822 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1823 netif_wake_queue(netdev);
1824 ++adapter->restart_queue;
1825 }
1826 }
1827
1828 if (adapter->detect_tx_hung) {
1829 /* detect a transmit hang in hardware, this serializes the
1830 * check with the clearing of time_stamp and movement of i */
1831 adapter->detect_tx_hung = false;
1832 if (tx_ring->buffer_info[eop].time_stamp &&
1833 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1834 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1835 IXGB_STATUS_TXOFF)) {
1836 /* detected Tx unit hang */
1837 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1838 " TDH <%x>\n"
1839 " TDT <%x>\n"
1840 " next_to_use <%x>\n"
1841 " next_to_clean <%x>\n"
1842 "buffer_info[next_to_clean]\n"
1843 " time_stamp <%lx>\n"
1844 " next_to_watch <%x>\n"
1845 " jiffies <%lx>\n"
1846 " next_to_watch.status <%x>\n",
1847 IXGB_READ_REG(&adapter->hw, TDH),
1848 IXGB_READ_REG(&adapter->hw, TDT),
1849 tx_ring->next_to_use,
1850 tx_ring->next_to_clean,
1851 tx_ring->buffer_info[eop].time_stamp,
1852 eop,
1853 jiffies,
1854 eop_desc->status);
1855 netif_stop_queue(netdev);
1856 }
1857 }
1858
1859 return cleaned;
1860 }
1861
1862 /**
1863 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1864 * @adapter: board private structure
1865 * @rx_desc: receive descriptor
1866 * @sk_buff: socket buffer with received data
1867 **/
1868
1869 static void
1870 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1871 struct ixgb_rx_desc *rx_desc,
1872 struct sk_buff *skb)
1873 {
1874 /* Ignore Checksum bit is set OR
1875 * TCP Checksum has not been calculated
1876 */
1877 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1878 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1879 skb->ip_summed = CHECKSUM_NONE;
1880 return;
1881 }
1882
1883 /* At this point we know the hardware did the TCP checksum */
1884 /* now look at the TCP checksum error bit */
1885 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1886 /* let the stack verify checksum errors */
1887 skb->ip_summed = CHECKSUM_NONE;
1888 adapter->hw_csum_rx_error++;
1889 } else {
1890 /* TCP checksum is good */
1891 skb->ip_summed = CHECKSUM_UNNECESSARY;
1892 adapter->hw_csum_rx_good++;
1893 }
1894 }
1895
1896 /**
1897 * ixgb_clean_rx_irq - Send received data up the network stack,
1898 * @adapter: board private structure
1899 **/
1900
1901 static bool
1902 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1903 {
1904 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1905 struct net_device *netdev = adapter->netdev;
1906 struct pci_dev *pdev = adapter->pdev;
1907 struct ixgb_rx_desc *rx_desc, *next_rxd;
1908 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1909 u32 length;
1910 unsigned int i, j;
1911 int cleaned_count = 0;
1912 bool cleaned = false;
1913
1914 i = rx_ring->next_to_clean;
1915 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1916 buffer_info = &rx_ring->buffer_info[i];
1917
1918 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1919 struct sk_buff *skb;
1920 u8 status;
1921
1922 if (*work_done >= work_to_do)
1923 break;
1924
1925 (*work_done)++;
1926 status = rx_desc->status;
1927 skb = buffer_info->skb;
1928 buffer_info->skb = NULL;
1929
1930 prefetch(skb->data - NET_IP_ALIGN);
1931
1932 if (++i == rx_ring->count) i = 0;
1933 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1934 prefetch(next_rxd);
1935
1936 if ((j = i + 1) == rx_ring->count) j = 0;
1937 next2_buffer = &rx_ring->buffer_info[j];
1938 prefetch(next2_buffer);
1939
1940 next_buffer = &rx_ring->buffer_info[i];
1941
1942 cleaned = true;
1943 cleaned_count++;
1944
1945 pci_unmap_single(pdev,
1946 buffer_info->dma,
1947 buffer_info->length,
1948 PCI_DMA_FROMDEVICE);
1949 buffer_info->dma = 0;
1950
1951 length = le16_to_cpu(rx_desc->length);
1952 rx_desc->length = 0;
1953
1954 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1955
1956 /* All receives must fit into a single buffer */
1957
1958 IXGB_DBG("Receive packet consumed multiple buffers "
1959 "length<%x>\n", length);
1960
1961 dev_kfree_skb_irq(skb);
1962 goto rxdesc_done;
1963 }
1964
1965 if (unlikely(rx_desc->errors &
1966 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1967 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1968 dev_kfree_skb_irq(skb);
1969 goto rxdesc_done;
1970 }
1971
1972 /* code added for copybreak, this should improve
1973 * performance for small packets with large amounts
1974 * of reassembly being done in the stack */
1975 if (length < copybreak) {
1976 struct sk_buff *new_skb =
1977 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1978 if (new_skb) {
1979 skb_reserve(new_skb, NET_IP_ALIGN);
1980 skb_copy_to_linear_data_offset(new_skb,
1981 -NET_IP_ALIGN,
1982 (skb->data -
1983 NET_IP_ALIGN),
1984 (length +
1985 NET_IP_ALIGN));
1986 /* save the skb in buffer_info as good */
1987 buffer_info->skb = skb;
1988 skb = new_skb;
1989 }
1990 }
1991 /* end copybreak code */
1992
1993 /* Good Receive */
1994 skb_put(skb, length);
1995
1996 /* Receive Checksum Offload */
1997 ixgb_rx_checksum(adapter, rx_desc, skb);
1998
1999 skb->protocol = eth_type_trans(skb, netdev);
2000 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2001 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2002 le16_to_cpu(rx_desc->special));
2003 } else {
2004 netif_receive_skb(skb);
2005 }
2006
2007 rxdesc_done:
2008 /* clean up descriptor, might be written over by hw */
2009 rx_desc->status = 0;
2010
2011 /* return some buffers to hardware, one at a time is too slow */
2012 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2013 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2014 cleaned_count = 0;
2015 }
2016
2017 /* use prefetched values */
2018 rx_desc = next_rxd;
2019 buffer_info = next_buffer;
2020 }
2021
2022 rx_ring->next_to_clean = i;
2023
2024 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2025 if (cleaned_count)
2026 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2027
2028 return cleaned;
2029 }
2030
2031 /**
2032 * ixgb_alloc_rx_buffers - Replace used receive buffers
2033 * @adapter: address of board private structure
2034 **/
2035
2036 static void
2037 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2038 {
2039 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2040 struct net_device *netdev = adapter->netdev;
2041 struct pci_dev *pdev = adapter->pdev;
2042 struct ixgb_rx_desc *rx_desc;
2043 struct ixgb_buffer *buffer_info;
2044 struct sk_buff *skb;
2045 unsigned int i;
2046 long cleancount;
2047
2048 i = rx_ring->next_to_use;
2049 buffer_info = &rx_ring->buffer_info[i];
2050 cleancount = IXGB_DESC_UNUSED(rx_ring);
2051
2052
2053 /* leave three descriptors unused */
2054 while (--cleancount > 2 && cleaned_count--) {
2055 /* recycle! its good for you */
2056 skb = buffer_info->skb;
2057 if (skb) {
2058 skb_trim(skb, 0);
2059 goto map_skb;
2060 }
2061
2062 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2063 + NET_IP_ALIGN);
2064 if (unlikely(!skb)) {
2065 /* Better luck next round */
2066 adapter->alloc_rx_buff_failed++;
2067 break;
2068 }
2069
2070 /* Make buffer alignment 2 beyond a 16 byte boundary
2071 * this will result in a 16 byte aligned IP header after
2072 * the 14 byte MAC header is removed
2073 */
2074 skb_reserve(skb, NET_IP_ALIGN);
2075
2076 buffer_info->skb = skb;
2077 buffer_info->length = adapter->rx_buffer_len;
2078 map_skb:
2079 buffer_info->dma = pci_map_single(pdev,
2080 skb->data,
2081 adapter->rx_buffer_len,
2082 PCI_DMA_FROMDEVICE);
2083
2084 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2085 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2086 /* guarantee DD bit not set now before h/w gets descriptor
2087 * this is the rest of the workaround for h/w double
2088 * writeback. */
2089 rx_desc->status = 0;
2090
2091
2092 if (++i == rx_ring->count) i = 0;
2093 buffer_info = &rx_ring->buffer_info[i];
2094 }
2095
2096 if (likely(rx_ring->next_to_use != i)) {
2097 rx_ring->next_to_use = i;
2098 if (unlikely(i-- == 0))
2099 i = (rx_ring->count - 1);
2100
2101 /* Force memory writes to complete before letting h/w
2102 * know there are new descriptors to fetch. (Only
2103 * applicable for weak-ordered memory model archs, such
2104 * as IA-64). */
2105 wmb();
2106 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2107 }
2108 }
2109
2110 /**
2111 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2112 *
2113 * @param netdev network interface device structure
2114 * @param grp indicates to enable or disable tagging/stripping
2115 **/
2116 static void
2117 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2118 {
2119 struct ixgb_adapter *adapter = netdev_priv(netdev);
2120 u32 ctrl, rctl;
2121
2122 ixgb_irq_disable(adapter);
2123 adapter->vlgrp = grp;
2124
2125 if (grp) {
2126 /* enable VLAN tag insert/strip */
2127 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2128 ctrl |= IXGB_CTRL0_VME;
2129 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2130
2131 /* enable VLAN receive filtering */
2132
2133 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2134 rctl &= ~IXGB_RCTL_CFIEN;
2135 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2136 } else {
2137 /* disable VLAN tag insert/strip */
2138
2139 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140 ctrl &= ~IXGB_CTRL0_VME;
2141 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142 }
2143
2144 /* don't enable interrupts unless we are UP */
2145 if (adapter->netdev->flags & IFF_UP)
2146 ixgb_irq_enable(adapter);
2147 }
2148
2149 static void
2150 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2151 {
2152 struct ixgb_adapter *adapter = netdev_priv(netdev);
2153 u32 vfta, index;
2154
2155 /* add VID to filter table */
2156
2157 index = (vid >> 5) & 0x7F;
2158 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2159 vfta |= (1 << (vid & 0x1F));
2160 ixgb_write_vfta(&adapter->hw, index, vfta);
2161 }
2162
2163 static void
2164 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2165 {
2166 struct ixgb_adapter *adapter = netdev_priv(netdev);
2167 u32 vfta, index;
2168
2169 ixgb_irq_disable(adapter);
2170
2171 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2172
2173 /* don't enable interrupts unless we are UP */
2174 if (adapter->netdev->flags & IFF_UP)
2175 ixgb_irq_enable(adapter);
2176
2177 /* remove VID from filter table */
2178
2179 index = (vid >> 5) & 0x7F;
2180 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2181 vfta &= ~(1 << (vid & 0x1F));
2182 ixgb_write_vfta(&adapter->hw, index, vfta);
2183 }
2184
2185 static void
2186 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2187 {
2188 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2189
2190 if (adapter->vlgrp) {
2191 u16 vid;
2192 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2193 if (!vlan_group_get_device(adapter->vlgrp, vid))
2194 continue;
2195 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2196 }
2197 }
2198 }
2199
2200 #ifdef CONFIG_NET_POLL_CONTROLLER
2201 /*
2202 * Polling 'interrupt' - used by things like netconsole to send skbs
2203 * without having to re-enable interrupts. It's not called while
2204 * the interrupt routine is executing.
2205 */
2206
2207 static void ixgb_netpoll(struct net_device *dev)
2208 {
2209 struct ixgb_adapter *adapter = netdev_priv(dev);
2210
2211 disable_irq(adapter->pdev->irq);
2212 ixgb_intr(adapter->pdev->irq, dev);
2213 enable_irq(adapter->pdev->irq);
2214 }
2215 #endif
2216
2217 /**
2218 * ixgb_io_error_detected() - called when PCI error is detected
2219 * @pdev pointer to pci device with error
2220 * @state pci channel state after error
2221 *
2222 * This callback is called by the PCI subsystem whenever
2223 * a PCI bus error is detected.
2224 */
2225 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2226 enum pci_channel_state state)
2227 {
2228 struct net_device *netdev = pci_get_drvdata(pdev);
2229 struct ixgb_adapter *adapter = netdev_priv(netdev);
2230
2231 netif_device_detach(netdev);
2232
2233 if (state == pci_channel_io_perm_failure)
2234 return PCI_ERS_RESULT_DISCONNECT;
2235
2236 if (netif_running(netdev))
2237 ixgb_down(adapter, true);
2238
2239 pci_disable_device(pdev);
2240
2241 /* Request a slot reset. */
2242 return PCI_ERS_RESULT_NEED_RESET;
2243 }
2244
2245 /**
2246 * ixgb_io_slot_reset - called after the pci bus has been reset.
2247 * @pdev pointer to pci device with error
2248 *
2249 * This callback is called after the PCI bus has been reset.
2250 * Basically, this tries to restart the card from scratch.
2251 * This is a shortened version of the device probe/discovery code,
2252 * it resembles the first-half of the ixgb_probe() routine.
2253 */
2254 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2255 {
2256 struct net_device *netdev = pci_get_drvdata(pdev);
2257 struct ixgb_adapter *adapter = netdev_priv(netdev);
2258
2259 if (pci_enable_device(pdev)) {
2260 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2261 return PCI_ERS_RESULT_DISCONNECT;
2262 }
2263
2264 /* Perform card reset only on one instance of the card */
2265 if (0 != PCI_FUNC (pdev->devfn))
2266 return PCI_ERS_RESULT_RECOVERED;
2267
2268 pci_set_master(pdev);
2269
2270 netif_carrier_off(netdev);
2271 netif_stop_queue(netdev);
2272 ixgb_reset(adapter);
2273
2274 /* Make sure the EEPROM is good */
2275 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2276 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2277 return PCI_ERS_RESULT_DISCONNECT;
2278 }
2279 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2280 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2281
2282 if (!is_valid_ether_addr(netdev->perm_addr)) {
2283 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2284 return PCI_ERS_RESULT_DISCONNECT;
2285 }
2286
2287 return PCI_ERS_RESULT_RECOVERED;
2288 }
2289
2290 /**
2291 * ixgb_io_resume - called when its OK to resume normal operations
2292 * @pdev pointer to pci device with error
2293 *
2294 * The error recovery driver tells us that its OK to resume
2295 * normal operation. Implementation resembles the second-half
2296 * of the ixgb_probe() routine.
2297 */
2298 static void ixgb_io_resume(struct pci_dev *pdev)
2299 {
2300 struct net_device *netdev = pci_get_drvdata(pdev);
2301 struct ixgb_adapter *adapter = netdev_priv(netdev);
2302
2303 pci_set_master(pdev);
2304
2305 if (netif_running(netdev)) {
2306 if (ixgb_up(adapter)) {
2307 printk ("ixgb: can't bring device back up after reset\n");
2308 return;
2309 }
2310 }
2311
2312 netif_device_attach(netdev);
2313 mod_timer(&adapter->watchdog_timer, jiffies);
2314 }
2315
2316 /* ixgb_main.c */
Linux with added FPC-III support