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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[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 /**
325 * ixgb_probe - Device Initialization Routine
326 * @pdev: PCI device information struct
327 * @ent: entry in ixgb_pci_tbl
328 *
329 * Returns 0 on success, negative on failure
330 *
331 * ixgb_probe initializes an adapter identified by a pci_dev structure.
332 * The OS initialization, configuring of the adapter private structure,
333 * and a hardware reset occur.
334 **/
335
336 static int __devinit
337 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
338 {
339 struct net_device *netdev = NULL;
340 struct ixgb_adapter *adapter;
341 static int cards_found = 0;
342 int pci_using_dac;
343 int i;
344 int err;
345
346 err = pci_enable_device(pdev);
347 if (err)
348 return err;
349
350 if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
351 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
352 pci_using_dac = 1;
353 } else {
354 if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
355 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
356 printk(KERN_ERR
357 "ixgb: No usable DMA configuration, aborting\n");
358 goto err_dma_mask;
359 }
360 pci_using_dac = 0;
361 }
362
363 err = pci_request_regions(pdev, ixgb_driver_name);
364 if (err)
365 goto err_request_regions;
366
367 pci_set_master(pdev);
368
369 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
370 if (!netdev) {
371 err = -ENOMEM;
372 goto err_alloc_etherdev;
373 }
374
375 SET_NETDEV_DEV(netdev, &pdev->dev);
376
377 pci_set_drvdata(pdev, netdev);
378 adapter = netdev_priv(netdev);
379 adapter->netdev = netdev;
380 adapter->pdev = pdev;
381 adapter->hw.back = adapter;
382 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
383
384 adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
385 pci_resource_len(pdev, BAR_0));
386 if (!adapter->hw.hw_addr) {
387 err = -EIO;
388 goto err_ioremap;
389 }
390
391 for (i = BAR_1; i <= BAR_5; i++) {
392 if (pci_resource_len(pdev, i) == 0)
393 continue;
394 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
395 adapter->hw.io_base = pci_resource_start(pdev, i);
396 break;
397 }
398 }
399
400 netdev->open = &ixgb_open;
401 netdev->stop = &ixgb_close;
402 netdev->hard_start_xmit = &ixgb_xmit_frame;
403 netdev->get_stats = &ixgb_get_stats;
404 netdev->set_multicast_list = &ixgb_set_multi;
405 netdev->set_mac_address = &ixgb_set_mac;
406 netdev->change_mtu = &ixgb_change_mtu;
407 ixgb_set_ethtool_ops(netdev);
408 netdev->tx_timeout = &ixgb_tx_timeout;
409 netdev->watchdog_timeo = 5 * HZ;
410 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
411 netdev->vlan_rx_register = ixgb_vlan_rx_register;
412 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
413 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
414 #ifdef CONFIG_NET_POLL_CONTROLLER
415 netdev->poll_controller = ixgb_netpoll;
416 #endif
417
418 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
419
420 adapter->bd_number = cards_found;
421 adapter->link_speed = 0;
422 adapter->link_duplex = 0;
423
424 /* setup the private structure */
425
426 err = ixgb_sw_init(adapter);
427 if (err)
428 goto err_sw_init;
429
430 netdev->features = NETIF_F_SG |
431 NETIF_F_HW_CSUM |
432 NETIF_F_HW_VLAN_TX |
433 NETIF_F_HW_VLAN_RX |
434 NETIF_F_HW_VLAN_FILTER;
435 netdev->features |= NETIF_F_TSO;
436
437 if (pci_using_dac)
438 netdev->features |= NETIF_F_HIGHDMA;
439
440 /* make sure the EEPROM is good */
441
442 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
443 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
444 err = -EIO;
445 goto err_eeprom;
446 }
447
448 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
449 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
450
451 if (!is_valid_ether_addr(netdev->perm_addr)) {
452 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
453 err = -EIO;
454 goto err_eeprom;
455 }
456
457 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
458
459 init_timer(&adapter->watchdog_timer);
460 adapter->watchdog_timer.function = &ixgb_watchdog;
461 adapter->watchdog_timer.data = (unsigned long)adapter;
462
463 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
464
465 strcpy(netdev->name, "eth%d");
466 err = register_netdev(netdev);
467 if (err)
468 goto err_register;
469
470 /* we're going to reset, so assume we have no link for now */
471
472 netif_carrier_off(netdev);
473 netif_stop_queue(netdev);
474
475 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
476 ixgb_check_options(adapter);
477 /* reset the hardware with the new settings */
478
479 ixgb_reset(adapter);
480
481 cards_found++;
482 return 0;
483
484 err_register:
485 err_sw_init:
486 err_eeprom:
487 iounmap(adapter->hw.hw_addr);
488 err_ioremap:
489 free_netdev(netdev);
490 err_alloc_etherdev:
491 pci_release_regions(pdev);
492 err_request_regions:
493 err_dma_mask:
494 pci_disable_device(pdev);
495 return err;
496 }
497
498 /**
499 * ixgb_remove - Device Removal Routine
500 * @pdev: PCI device information struct
501 *
502 * ixgb_remove is called by the PCI subsystem to alert the driver
503 * that it should release a PCI device. The could be caused by a
504 * Hot-Plug event, or because the driver is going to be removed from
505 * memory.
506 **/
507
508 static void __devexit
509 ixgb_remove(struct pci_dev *pdev)
510 {
511 struct net_device *netdev = pci_get_drvdata(pdev);
512 struct ixgb_adapter *adapter = netdev_priv(netdev);
513
514 flush_scheduled_work();
515
516 unregister_netdev(netdev);
517
518 iounmap(adapter->hw.hw_addr);
519 pci_release_regions(pdev);
520
521 free_netdev(netdev);
522 }
523
524 /**
525 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
526 * @adapter: board private structure to initialize
527 *
528 * ixgb_sw_init initializes the Adapter private data structure.
529 * Fields are initialized based on PCI device information and
530 * OS network device settings (MTU size).
531 **/
532
533 static int __devinit
534 ixgb_sw_init(struct ixgb_adapter *adapter)
535 {
536 struct ixgb_hw *hw = &adapter->hw;
537 struct net_device *netdev = adapter->netdev;
538 struct pci_dev *pdev = adapter->pdev;
539
540 /* PCI config space info */
541
542 hw->vendor_id = pdev->vendor;
543 hw->device_id = pdev->device;
544 hw->subsystem_vendor_id = pdev->subsystem_vendor;
545 hw->subsystem_id = pdev->subsystem_device;
546
547 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
548 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
549
550 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
551 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
552 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
553 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
554 hw->mac_type = ixgb_82597;
555 else {
556 /* should never have loaded on this device */
557 DPRINTK(PROBE, ERR, "unsupported device id\n");
558 }
559
560 /* enable flow control to be programmed */
561 hw->fc.send_xon = 1;
562
563 set_bit(__IXGB_DOWN, &adapter->flags);
564 return 0;
565 }
566
567 /**
568 * ixgb_open - Called when a network interface is made active
569 * @netdev: network interface device structure
570 *
571 * Returns 0 on success, negative value on failure
572 *
573 * The open entry point is called when a network interface is made
574 * active by the system (IFF_UP). At this point all resources needed
575 * for transmit and receive operations are allocated, the interrupt
576 * handler is registered with the OS, the watchdog timer is started,
577 * and the stack is notified that the interface is ready.
578 **/
579
580 static int
581 ixgb_open(struct net_device *netdev)
582 {
583 struct ixgb_adapter *adapter = netdev_priv(netdev);
584 int err;
585
586 /* allocate transmit descriptors */
587 err = ixgb_setup_tx_resources(adapter);
588 if (err)
589 goto err_setup_tx;
590
591 /* allocate receive descriptors */
592
593 err = ixgb_setup_rx_resources(adapter);
594 if (err)
595 goto err_setup_rx;
596
597 err = ixgb_up(adapter);
598 if (err)
599 goto err_up;
600
601 return 0;
602
603 err_up:
604 ixgb_free_rx_resources(adapter);
605 err_setup_rx:
606 ixgb_free_tx_resources(adapter);
607 err_setup_tx:
608 ixgb_reset(adapter);
609
610 return err;
611 }
612
613 /**
614 * ixgb_close - Disables a network interface
615 * @netdev: network interface device structure
616 *
617 * Returns 0, this is not allowed to fail
618 *
619 * The close entry point is called when an interface is de-activated
620 * by the OS. The hardware is still under the drivers control, but
621 * needs to be disabled. A global MAC reset is issued to stop the
622 * hardware, and all transmit and receive resources are freed.
623 **/
624
625 static int
626 ixgb_close(struct net_device *netdev)
627 {
628 struct ixgb_adapter *adapter = netdev_priv(netdev);
629
630 ixgb_down(adapter, true);
631
632 ixgb_free_tx_resources(adapter);
633 ixgb_free_rx_resources(adapter);
634
635 return 0;
636 }
637
638 /**
639 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
640 * @adapter: board private structure
641 *
642 * Return 0 on success, negative on failure
643 **/
644
645 int
646 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
647 {
648 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
649 struct pci_dev *pdev = adapter->pdev;
650 int size;
651
652 size = sizeof(struct ixgb_buffer) * txdr->count;
653 txdr->buffer_info = vmalloc(size);
654 if (!txdr->buffer_info) {
655 DPRINTK(PROBE, ERR,
656 "Unable to allocate transmit descriptor ring memory\n");
657 return -ENOMEM;
658 }
659 memset(txdr->buffer_info, 0, size);
660
661 /* round up to nearest 4K */
662
663 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
664 txdr->size = ALIGN(txdr->size, 4096);
665
666 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
667 if (!txdr->desc) {
668 vfree(txdr->buffer_info);
669 DPRINTK(PROBE, ERR,
670 "Unable to allocate transmit descriptor memory\n");
671 return -ENOMEM;
672 }
673 memset(txdr->desc, 0, txdr->size);
674
675 txdr->next_to_use = 0;
676 txdr->next_to_clean = 0;
677
678 return 0;
679 }
680
681 /**
682 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
683 * @adapter: board private structure
684 *
685 * Configure the Tx unit of the MAC after a reset.
686 **/
687
688 static void
689 ixgb_configure_tx(struct ixgb_adapter *adapter)
690 {
691 u64 tdba = adapter->tx_ring.dma;
692 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
693 u32 tctl;
694 struct ixgb_hw *hw = &adapter->hw;
695
696 /* Setup the Base and Length of the Tx Descriptor Ring
697 * tx_ring.dma can be either a 32 or 64 bit value
698 */
699
700 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
701 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
702
703 IXGB_WRITE_REG(hw, TDLEN, tdlen);
704
705 /* Setup the HW Tx Head and Tail descriptor pointers */
706
707 IXGB_WRITE_REG(hw, TDH, 0);
708 IXGB_WRITE_REG(hw, TDT, 0);
709
710 /* don't set up txdctl, it induces performance problems if configured
711 * incorrectly */
712 /* Set the Tx Interrupt Delay register */
713
714 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
715
716 /* Program the Transmit Control Register */
717
718 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
719 IXGB_WRITE_REG(hw, TCTL, tctl);
720
721 /* Setup Transmit Descriptor Settings for this adapter */
722 adapter->tx_cmd_type =
723 IXGB_TX_DESC_TYPE |
724 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
725 }
726
727 /**
728 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
729 * @adapter: board private structure
730 *
731 * Returns 0 on success, negative on failure
732 **/
733
734 int
735 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
736 {
737 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
738 struct pci_dev *pdev = adapter->pdev;
739 int size;
740
741 size = sizeof(struct ixgb_buffer) * rxdr->count;
742 rxdr->buffer_info = vmalloc(size);
743 if (!rxdr->buffer_info) {
744 DPRINTK(PROBE, ERR,
745 "Unable to allocate receive descriptor ring\n");
746 return -ENOMEM;
747 }
748 memset(rxdr->buffer_info, 0, size);
749
750 /* Round up to nearest 4K */
751
752 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
753 rxdr->size = ALIGN(rxdr->size, 4096);
754
755 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
756
757 if (!rxdr->desc) {
758 vfree(rxdr->buffer_info);
759 DPRINTK(PROBE, ERR,
760 "Unable to allocate receive descriptors\n");
761 return -ENOMEM;
762 }
763 memset(rxdr->desc, 0, rxdr->size);
764
765 rxdr->next_to_clean = 0;
766 rxdr->next_to_use = 0;
767
768 return 0;
769 }
770
771 /**
772 * ixgb_setup_rctl - configure the receive control register
773 * @adapter: Board private structure
774 **/
775
776 static void
777 ixgb_setup_rctl(struct ixgb_adapter *adapter)
778 {
779 u32 rctl;
780
781 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
782
783 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
784
785 rctl |=
786 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
787 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
788 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
789
790 rctl |= IXGB_RCTL_SECRC;
791
792 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
793 rctl |= IXGB_RCTL_BSIZE_2048;
794 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
795 rctl |= IXGB_RCTL_BSIZE_4096;
796 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
797 rctl |= IXGB_RCTL_BSIZE_8192;
798 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
799 rctl |= IXGB_RCTL_BSIZE_16384;
800
801 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
802 }
803
804 /**
805 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
806 * @adapter: board private structure
807 *
808 * Configure the Rx unit of the MAC after a reset.
809 **/
810
811 static void
812 ixgb_configure_rx(struct ixgb_adapter *adapter)
813 {
814 u64 rdba = adapter->rx_ring.dma;
815 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
816 struct ixgb_hw *hw = &adapter->hw;
817 u32 rctl;
818 u32 rxcsum;
819
820 /* make sure receives are disabled while setting up the descriptors */
821
822 rctl = IXGB_READ_REG(hw, RCTL);
823 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
824
825 /* set the Receive Delay Timer Register */
826
827 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
828
829 /* Setup the Base and Length of the Rx Descriptor Ring */
830
831 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
832 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
833
834 IXGB_WRITE_REG(hw, RDLEN, rdlen);
835
836 /* Setup the HW Rx Head and Tail Descriptor Pointers */
837 IXGB_WRITE_REG(hw, RDH, 0);
838 IXGB_WRITE_REG(hw, RDT, 0);
839
840 /* due to the hardware errata with RXDCTL, we are unable to use any of
841 * the performance enhancing features of it without causing other
842 * subtle bugs, some of the bugs could include receive length
843 * corruption at high data rates (WTHRESH > 0) and/or receive
844 * descriptor ring irregularites (particularly in hardware cache) */
845 IXGB_WRITE_REG(hw, RXDCTL, 0);
846
847 /* Enable Receive Checksum Offload for TCP and UDP */
848 if (adapter->rx_csum) {
849 rxcsum = IXGB_READ_REG(hw, RXCSUM);
850 rxcsum |= IXGB_RXCSUM_TUOFL;
851 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
852 }
853
854 /* Enable Receives */
855
856 IXGB_WRITE_REG(hw, RCTL, rctl);
857 }
858
859 /**
860 * ixgb_free_tx_resources - Free Tx Resources
861 * @adapter: board private structure
862 *
863 * Free all transmit software resources
864 **/
865
866 void
867 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
868 {
869 struct pci_dev *pdev = adapter->pdev;
870
871 ixgb_clean_tx_ring(adapter);
872
873 vfree(adapter->tx_ring.buffer_info);
874 adapter->tx_ring.buffer_info = NULL;
875
876 pci_free_consistent(pdev, adapter->tx_ring.size,
877 adapter->tx_ring.desc, adapter->tx_ring.dma);
878
879 adapter->tx_ring.desc = NULL;
880 }
881
882 static void
883 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
884 struct ixgb_buffer *buffer_info)
885 {
886 struct pci_dev *pdev = adapter->pdev;
887
888 if (buffer_info->dma)
889 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
890 PCI_DMA_TODEVICE);
891
892 /* okay to call kfree_skb here instead of kfree_skb_any because
893 * this is never called in interrupt context */
894 if (buffer_info->skb)
895 dev_kfree_skb(buffer_info->skb);
896
897 buffer_info->skb = NULL;
898 buffer_info->dma = 0;
899 buffer_info->time_stamp = 0;
900 /* these fields must always be initialized in tx
901 * buffer_info->length = 0;
902 * buffer_info->next_to_watch = 0; */
903 }
904
905 /**
906 * ixgb_clean_tx_ring - Free Tx Buffers
907 * @adapter: board private structure
908 **/
909
910 static void
911 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
912 {
913 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
914 struct ixgb_buffer *buffer_info;
915 unsigned long size;
916 unsigned int i;
917
918 /* Free all the Tx ring sk_buffs */
919
920 for (i = 0; i < tx_ring->count; i++) {
921 buffer_info = &tx_ring->buffer_info[i];
922 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
923 }
924
925 size = sizeof(struct ixgb_buffer) * tx_ring->count;
926 memset(tx_ring->buffer_info, 0, size);
927
928 /* Zero out the descriptor ring */
929
930 memset(tx_ring->desc, 0, tx_ring->size);
931
932 tx_ring->next_to_use = 0;
933 tx_ring->next_to_clean = 0;
934
935 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
936 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
937 }
938
939 /**
940 * ixgb_free_rx_resources - Free Rx Resources
941 * @adapter: board private structure
942 *
943 * Free all receive software resources
944 **/
945
946 void
947 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
948 {
949 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
950 struct pci_dev *pdev = adapter->pdev;
951
952 ixgb_clean_rx_ring(adapter);
953
954 vfree(rx_ring->buffer_info);
955 rx_ring->buffer_info = NULL;
956
957 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
958
959 rx_ring->desc = NULL;
960 }
961
962 /**
963 * ixgb_clean_rx_ring - Free Rx Buffers
964 * @adapter: board private structure
965 **/
966
967 static void
968 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
969 {
970 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
971 struct ixgb_buffer *buffer_info;
972 struct pci_dev *pdev = adapter->pdev;
973 unsigned long size;
974 unsigned int i;
975
976 /* Free all the Rx ring sk_buffs */
977
978 for (i = 0; i < rx_ring->count; i++) {
979 buffer_info = &rx_ring->buffer_info[i];
980 if (buffer_info->dma) {
981 pci_unmap_single(pdev,
982 buffer_info->dma,
983 buffer_info->length,
984 PCI_DMA_FROMDEVICE);
985 buffer_info->dma = 0;
986 buffer_info->length = 0;
987 }
988
989 if (buffer_info->skb) {
990 dev_kfree_skb(buffer_info->skb);
991 buffer_info->skb = NULL;
992 }
993 }
994
995 size = sizeof(struct ixgb_buffer) * rx_ring->count;
996 memset(rx_ring->buffer_info, 0, size);
997
998 /* Zero out the descriptor ring */
999
1000 memset(rx_ring->desc, 0, rx_ring->size);
1001
1002 rx_ring->next_to_clean = 0;
1003 rx_ring->next_to_use = 0;
1004
1005 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1006 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1007 }
1008
1009 /**
1010 * ixgb_set_mac - Change the Ethernet Address of the NIC
1011 * @netdev: network interface device structure
1012 * @p: pointer to an address structure
1013 *
1014 * Returns 0 on success, negative on failure
1015 **/
1016
1017 static int
1018 ixgb_set_mac(struct net_device *netdev, void *p)
1019 {
1020 struct ixgb_adapter *adapter = netdev_priv(netdev);
1021 struct sockaddr *addr = p;
1022
1023 if (!is_valid_ether_addr(addr->sa_data))
1024 return -EADDRNOTAVAIL;
1025
1026 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1027
1028 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1029
1030 return 0;
1031 }
1032
1033 /**
1034 * ixgb_set_multi - Multicast and Promiscuous mode set
1035 * @netdev: network interface device structure
1036 *
1037 * The set_multi entry point is called whenever the multicast address
1038 * list or the network interface flags are updated. This routine is
1039 * responsible for configuring the hardware for proper multicast,
1040 * promiscuous mode, and all-multi behavior.
1041 **/
1042
1043 static void
1044 ixgb_set_multi(struct net_device *netdev)
1045 {
1046 struct ixgb_adapter *adapter = netdev_priv(netdev);
1047 struct ixgb_hw *hw = &adapter->hw;
1048 struct dev_mc_list *mc_ptr;
1049 u32 rctl;
1050 int i;
1051
1052 /* Check for Promiscuous and All Multicast modes */
1053
1054 rctl = IXGB_READ_REG(hw, RCTL);
1055
1056 if (netdev->flags & IFF_PROMISC) {
1057 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1058 rctl &= ~IXGB_RCTL_VFE;
1059 } else {
1060 if (netdev->flags & IFF_ALLMULTI) {
1061 rctl |= IXGB_RCTL_MPE;
1062 rctl &= ~IXGB_RCTL_UPE;
1063 } else {
1064 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1065 }
1066 rctl |= IXGB_RCTL_VFE;
1067 }
1068
1069 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1070 rctl |= IXGB_RCTL_MPE;
1071 IXGB_WRITE_REG(hw, RCTL, rctl);
1072 } else {
1073 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1074 IXGB_ETH_LENGTH_OF_ADDRESS];
1075
1076 IXGB_WRITE_REG(hw, RCTL, rctl);
1077
1078 for (i = 0, mc_ptr = netdev->mc_list;
1079 mc_ptr;
1080 i++, mc_ptr = mc_ptr->next)
1081 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1082 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1083
1084 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1085 }
1086 }
1087
1088 /**
1089 * ixgb_watchdog - Timer Call-back
1090 * @data: pointer to netdev cast into an unsigned long
1091 **/
1092
1093 static void
1094 ixgb_watchdog(unsigned long data)
1095 {
1096 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1097 struct net_device *netdev = adapter->netdev;
1098 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1099
1100 ixgb_check_for_link(&adapter->hw);
1101
1102 if (ixgb_check_for_bad_link(&adapter->hw)) {
1103 /* force the reset path */
1104 netif_stop_queue(netdev);
1105 }
1106
1107 if (adapter->hw.link_up) {
1108 if (!netif_carrier_ok(netdev)) {
1109 DPRINTK(LINK, INFO,
1110 "NIC Link is Up 10000 Mbps Full Duplex\n");
1111 adapter->link_speed = 10000;
1112 adapter->link_duplex = FULL_DUPLEX;
1113 netif_carrier_on(netdev);
1114 netif_wake_queue(netdev);
1115 }
1116 } else {
1117 if (netif_carrier_ok(netdev)) {
1118 adapter->link_speed = 0;
1119 adapter->link_duplex = 0;
1120 DPRINTK(LINK, INFO, "NIC Link is Down\n");
1121 netif_carrier_off(netdev);
1122 netif_stop_queue(netdev);
1123
1124 }
1125 }
1126
1127 ixgb_update_stats(adapter);
1128
1129 if (!netif_carrier_ok(netdev)) {
1130 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1131 /* We've lost link, so the controller stops DMA,
1132 * but we've got queued Tx work that's never going
1133 * to get done, so reset controller to flush Tx.
1134 * (Do the reset outside of interrupt context). */
1135 schedule_work(&adapter->tx_timeout_task);
1136 }
1137 }
1138
1139 /* Force detection of hung controller every watchdog period */
1140 adapter->detect_tx_hung = true;
1141
1142 /* generate an interrupt to force clean up of any stragglers */
1143 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1144
1145 /* Reset the timer */
1146 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1147 }
1148
1149 #define IXGB_TX_FLAGS_CSUM 0x00000001
1150 #define IXGB_TX_FLAGS_VLAN 0x00000002
1151 #define IXGB_TX_FLAGS_TSO 0x00000004
1152
1153 static int
1154 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1155 {
1156 struct ixgb_context_desc *context_desc;
1157 unsigned int i;
1158 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1159 u16 ipcse, tucse, mss;
1160 int err;
1161
1162 if (likely(skb_is_gso(skb))) {
1163 struct ixgb_buffer *buffer_info;
1164 struct iphdr *iph;
1165
1166 if (skb_header_cloned(skb)) {
1167 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1168 if (err)
1169 return err;
1170 }
1171
1172 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1173 mss = skb_shinfo(skb)->gso_size;
1174 iph = ip_hdr(skb);
1175 iph->tot_len = 0;
1176 iph->check = 0;
1177 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1178 iph->daddr, 0,
1179 IPPROTO_TCP, 0);
1180 ipcss = skb_network_offset(skb);
1181 ipcso = (void *)&(iph->check) - (void *)skb->data;
1182 ipcse = skb_transport_offset(skb) - 1;
1183 tucss = skb_transport_offset(skb);
1184 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1185 tucse = 0;
1186
1187 i = adapter->tx_ring.next_to_use;
1188 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1189 buffer_info = &adapter->tx_ring.buffer_info[i];
1190 WARN_ON(buffer_info->dma != 0);
1191
1192 context_desc->ipcss = ipcss;
1193 context_desc->ipcso = ipcso;
1194 context_desc->ipcse = cpu_to_le16(ipcse);
1195 context_desc->tucss = tucss;
1196 context_desc->tucso = tucso;
1197 context_desc->tucse = cpu_to_le16(tucse);
1198 context_desc->mss = cpu_to_le16(mss);
1199 context_desc->hdr_len = hdr_len;
1200 context_desc->status = 0;
1201 context_desc->cmd_type_len = cpu_to_le32(
1202 IXGB_CONTEXT_DESC_TYPE
1203 | IXGB_CONTEXT_DESC_CMD_TSE
1204 | IXGB_CONTEXT_DESC_CMD_IP
1205 | IXGB_CONTEXT_DESC_CMD_TCP
1206 | IXGB_CONTEXT_DESC_CMD_IDE
1207 | (skb->len - (hdr_len)));
1208
1209
1210 if (++i == adapter->tx_ring.count) i = 0;
1211 adapter->tx_ring.next_to_use = i;
1212
1213 return 1;
1214 }
1215
1216 return 0;
1217 }
1218
1219 static bool
1220 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1221 {
1222 struct ixgb_context_desc *context_desc;
1223 unsigned int i;
1224 u8 css, cso;
1225
1226 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1227 struct ixgb_buffer *buffer_info;
1228 css = skb_transport_offset(skb);
1229 cso = css + skb->csum_offset;
1230
1231 i = adapter->tx_ring.next_to_use;
1232 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1233 buffer_info = &adapter->tx_ring.buffer_info[i];
1234 WARN_ON(buffer_info->dma != 0);
1235
1236 context_desc->tucss = css;
1237 context_desc->tucso = cso;
1238 context_desc->tucse = 0;
1239 /* zero out any previously existing data in one instruction */
1240 *(u32 *)&(context_desc->ipcss) = 0;
1241 context_desc->status = 0;
1242 context_desc->hdr_len = 0;
1243 context_desc->mss = 0;
1244 context_desc->cmd_type_len =
1245 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1246 | IXGB_TX_DESC_CMD_IDE);
1247
1248 if (++i == adapter->tx_ring.count) i = 0;
1249 adapter->tx_ring.next_to_use = i;
1250
1251 return true;
1252 }
1253
1254 return false;
1255 }
1256
1257 #define IXGB_MAX_TXD_PWR 14
1258 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1259
1260 static int
1261 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1262 unsigned int first)
1263 {
1264 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1265 struct ixgb_buffer *buffer_info;
1266 int len = skb->len;
1267 unsigned int offset = 0, size, count = 0, i;
1268 unsigned int mss = skb_shinfo(skb)->gso_size;
1269
1270 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1271 unsigned int f;
1272
1273 len -= skb->data_len;
1274
1275 i = tx_ring->next_to_use;
1276
1277 while (len) {
1278 buffer_info = &tx_ring->buffer_info[i];
1279 size = min(len, IXGB_MAX_DATA_PER_TXD);
1280 /* Workaround for premature desc write-backs
1281 * in TSO mode. Append 4-byte sentinel desc */
1282 if (unlikely(mss && !nr_frags && size == len && size > 8))
1283 size -= 4;
1284
1285 buffer_info->length = size;
1286 WARN_ON(buffer_info->dma != 0);
1287 buffer_info->time_stamp = jiffies;
1288 buffer_info->dma =
1289 pci_map_single(adapter->pdev,
1290 skb->data + offset,
1291 size,
1292 PCI_DMA_TODEVICE);
1293 buffer_info->next_to_watch = 0;
1294
1295 len -= size;
1296 offset += size;
1297 count++;
1298 if (++i == tx_ring->count) i = 0;
1299 }
1300
1301 for (f = 0; f < nr_frags; f++) {
1302 struct skb_frag_struct *frag;
1303
1304 frag = &skb_shinfo(skb)->frags[f];
1305 len = frag->size;
1306 offset = 0;
1307
1308 while (len) {
1309 buffer_info = &tx_ring->buffer_info[i];
1310 size = min(len, IXGB_MAX_DATA_PER_TXD);
1311
1312 /* Workaround for premature desc write-backs
1313 * in TSO mode. Append 4-byte sentinel desc */
1314 if (unlikely(mss && (f == (nr_frags - 1))
1315 && size == len && size > 8))
1316 size -= 4;
1317
1318 buffer_info->length = size;
1319 buffer_info->time_stamp = jiffies;
1320 buffer_info->dma =
1321 pci_map_page(adapter->pdev,
1322 frag->page,
1323 frag->page_offset + offset,
1324 size,
1325 PCI_DMA_TODEVICE);
1326 buffer_info->next_to_watch = 0;
1327
1328 len -= size;
1329 offset += size;
1330 count++;
1331 if (++i == tx_ring->count) i = 0;
1332 }
1333 }
1334 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1335 tx_ring->buffer_info[i].skb = skb;
1336 tx_ring->buffer_info[first].next_to_watch = i;
1337
1338 return count;
1339 }
1340
1341 static void
1342 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1343 {
1344 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1345 struct ixgb_tx_desc *tx_desc = NULL;
1346 struct ixgb_buffer *buffer_info;
1347 u32 cmd_type_len = adapter->tx_cmd_type;
1348 u8 status = 0;
1349 u8 popts = 0;
1350 unsigned int i;
1351
1352 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1353 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1354 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1355 }
1356
1357 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1358 popts |= IXGB_TX_DESC_POPTS_TXSM;
1359
1360 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1361 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1362
1363 i = tx_ring->next_to_use;
1364
1365 while (count--) {
1366 buffer_info = &tx_ring->buffer_info[i];
1367 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1368 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1369 tx_desc->cmd_type_len =
1370 cpu_to_le32(cmd_type_len | buffer_info->length);
1371 tx_desc->status = status;
1372 tx_desc->popts = popts;
1373 tx_desc->vlan = cpu_to_le16(vlan_id);
1374
1375 if (++i == tx_ring->count) i = 0;
1376 }
1377
1378 tx_desc->cmd_type_len |=
1379 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1380
1381 /* Force memory writes to complete before letting h/w
1382 * know there are new descriptors to fetch. (Only
1383 * applicable for weak-ordered memory model archs,
1384 * such as IA-64). */
1385 wmb();
1386
1387 tx_ring->next_to_use = i;
1388 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1389 }
1390
1391 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1392 {
1393 struct ixgb_adapter *adapter = netdev_priv(netdev);
1394 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1395
1396 netif_stop_queue(netdev);
1397 /* Herbert's original patch had:
1398 * smp_mb__after_netif_stop_queue();
1399 * but since that doesn't exist yet, just open code it. */
1400 smp_mb();
1401
1402 /* We need to check again in a case another CPU has just
1403 * made room available. */
1404 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1405 return -EBUSY;
1406
1407 /* A reprieve! */
1408 netif_start_queue(netdev);
1409 ++adapter->restart_queue;
1410 return 0;
1411 }
1412
1413 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1414 struct ixgb_desc_ring *tx_ring, int size)
1415 {
1416 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1417 return 0;
1418 return __ixgb_maybe_stop_tx(netdev, size);
1419 }
1420
1421
1422 /* Tx Descriptors needed, worst case */
1423 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1424 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1425 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1426 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1427 + 1 /* one more needed for sentinel TSO workaround */
1428
1429 static int
1430 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1431 {
1432 struct ixgb_adapter *adapter = netdev_priv(netdev);
1433 unsigned int first;
1434 unsigned int tx_flags = 0;
1435 int vlan_id = 0;
1436 int tso;
1437
1438 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1439 dev_kfree_skb(skb);
1440 return NETDEV_TX_OK;
1441 }
1442
1443 if (skb->len <= 0) {
1444 dev_kfree_skb(skb);
1445 return 0;
1446 }
1447
1448 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1449 DESC_NEEDED)))
1450 return NETDEV_TX_BUSY;
1451
1452 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1453 tx_flags |= IXGB_TX_FLAGS_VLAN;
1454 vlan_id = vlan_tx_tag_get(skb);
1455 }
1456
1457 first = adapter->tx_ring.next_to_use;
1458
1459 tso = ixgb_tso(adapter, skb);
1460 if (tso < 0) {
1461 dev_kfree_skb(skb);
1462 return NETDEV_TX_OK;
1463 }
1464
1465 if (likely(tso))
1466 tx_flags |= IXGB_TX_FLAGS_TSO;
1467 else if (ixgb_tx_csum(adapter, skb))
1468 tx_flags |= IXGB_TX_FLAGS_CSUM;
1469
1470 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1471 tx_flags);
1472
1473 netdev->trans_start = jiffies;
1474
1475 /* Make sure there is space in the ring for the next send. */
1476 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1477
1478 return NETDEV_TX_OK;
1479 }
1480
1481 /**
1482 * ixgb_tx_timeout - Respond to a Tx Hang
1483 * @netdev: network interface device structure
1484 **/
1485
1486 static void
1487 ixgb_tx_timeout(struct net_device *netdev)
1488 {
1489 struct ixgb_adapter *adapter = netdev_priv(netdev);
1490
1491 /* Do the reset outside of interrupt context */
1492 schedule_work(&adapter->tx_timeout_task);
1493 }
1494
1495 static void
1496 ixgb_tx_timeout_task(struct work_struct *work)
1497 {
1498 struct ixgb_adapter *adapter =
1499 container_of(work, struct ixgb_adapter, tx_timeout_task);
1500
1501 adapter->tx_timeout_count++;
1502 ixgb_down(adapter, true);
1503 ixgb_up(adapter);
1504 }
1505
1506 /**
1507 * ixgb_get_stats - Get System Network Statistics
1508 * @netdev: network interface device structure
1509 *
1510 * Returns the address of the device statistics structure.
1511 * The statistics are actually updated from the timer callback.
1512 **/
1513
1514 static struct net_device_stats *
1515 ixgb_get_stats(struct net_device *netdev)
1516 {
1517 struct ixgb_adapter *adapter = netdev_priv(netdev);
1518
1519 return &adapter->net_stats;
1520 }
1521
1522 /**
1523 * ixgb_change_mtu - Change the Maximum Transfer Unit
1524 * @netdev: network interface device structure
1525 * @new_mtu: new value for maximum frame size
1526 *
1527 * Returns 0 on success, negative on failure
1528 **/
1529
1530 static int
1531 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1532 {
1533 struct ixgb_adapter *adapter = netdev_priv(netdev);
1534 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1535 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1536
1537 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1538 if ((new_mtu < 68) ||
1539 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1540 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1541 return -EINVAL;
1542 }
1543
1544 if (old_max_frame == max_frame)
1545 return 0;
1546
1547 if (netif_running(netdev))
1548 ixgb_down(adapter, true);
1549
1550 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1551
1552 netdev->mtu = new_mtu;
1553
1554 if (netif_running(netdev))
1555 ixgb_up(adapter);
1556
1557 return 0;
1558 }
1559
1560 /**
1561 * ixgb_update_stats - Update the board statistics counters.
1562 * @adapter: board private structure
1563 **/
1564
1565 void
1566 ixgb_update_stats(struct ixgb_adapter *adapter)
1567 {
1568 struct net_device *netdev = adapter->netdev;
1569 struct pci_dev *pdev = adapter->pdev;
1570
1571 /* Prevent stats update while adapter is being reset */
1572 if (pci_channel_offline(pdev))
1573 return;
1574
1575 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1576 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1577 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1578 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1579 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1580 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1581
1582 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1583 /* fix up multicast stats by removing broadcasts */
1584 if (multi >= bcast)
1585 multi -= bcast;
1586
1587 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1588 adapter->stats.mprch += (multi >> 32);
1589 adapter->stats.bprcl += bcast_l;
1590 adapter->stats.bprch += bcast_h;
1591 } else {
1592 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1593 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1594 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1595 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1596 }
1597 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1598 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1599 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1600 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1601 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1602 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1603 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1604 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1605 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1606 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1607 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1608 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1609 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1610 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1611 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1612 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1613 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1614 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1615 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1616 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1617 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1618 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1619 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1620 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1621 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1622 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1623 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1624 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1625 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1626 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1627 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1628 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1629 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1630 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1631 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1632 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1633 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1634 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1635 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1636 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1637 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1638 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1639 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1640 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1641 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1642 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1643 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1644 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1645 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1646 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1647 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1648 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1649 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1650 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1651 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1652 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1653
1654 /* Fill out the OS statistics structure */
1655
1656 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1657 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1658 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1659 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1660 adapter->net_stats.multicast = adapter->stats.mprcl;
1661 adapter->net_stats.collisions = 0;
1662
1663 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1664 * with a length in the type/len field */
1665 adapter->net_stats.rx_errors =
1666 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1667 adapter->stats.ruc +
1668 adapter->stats.roc /*+ adapter->stats.rlec */ +
1669 adapter->stats.icbc +
1670 adapter->stats.ecbc + adapter->stats.mpc;
1671
1672 /* see above
1673 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1674 */
1675
1676 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1677 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1678 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1679 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1680
1681 adapter->net_stats.tx_errors = 0;
1682 adapter->net_stats.rx_frame_errors = 0;
1683 adapter->net_stats.tx_aborted_errors = 0;
1684 adapter->net_stats.tx_carrier_errors = 0;
1685 adapter->net_stats.tx_fifo_errors = 0;
1686 adapter->net_stats.tx_heartbeat_errors = 0;
1687 adapter->net_stats.tx_window_errors = 0;
1688 }
1689
1690 #define IXGB_MAX_INTR 10
1691 /**
1692 * ixgb_intr - Interrupt Handler
1693 * @irq: interrupt number
1694 * @data: pointer to a network interface device structure
1695 **/
1696
1697 static irqreturn_t
1698 ixgb_intr(int irq, void *data)
1699 {
1700 struct net_device *netdev = data;
1701 struct ixgb_adapter *adapter = netdev_priv(netdev);
1702 struct ixgb_hw *hw = &adapter->hw;
1703 u32 icr = IXGB_READ_REG(hw, ICR);
1704
1705 if (unlikely(!icr))
1706 return IRQ_NONE; /* Not our interrupt */
1707
1708 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1709 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1710 mod_timer(&adapter->watchdog_timer, jiffies);
1711
1712 if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1713
1714 /* Disable interrupts and register for poll. The flush
1715 of the posted write is intentionally left out.
1716 */
1717
1718 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1719 __netif_rx_schedule(netdev, &adapter->napi);
1720 }
1721 return IRQ_HANDLED;
1722 }
1723
1724 /**
1725 * ixgb_clean - NAPI Rx polling callback
1726 * @adapter: board private structure
1727 **/
1728
1729 static int
1730 ixgb_clean(struct napi_struct *napi, int budget)
1731 {
1732 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1733 struct net_device *netdev = adapter->netdev;
1734 int work_done = 0;
1735
1736 ixgb_clean_tx_irq(adapter);
1737 ixgb_clean_rx_irq(adapter, &work_done, budget);
1738
1739 /* If budget not fully consumed, exit the polling mode */
1740 if (work_done < budget) {
1741 netif_rx_complete(netdev, napi);
1742 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1743 ixgb_irq_enable(adapter);
1744 }
1745
1746 return work_done;
1747 }
1748
1749 /**
1750 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1751 * @adapter: board private structure
1752 **/
1753
1754 static bool
1755 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1756 {
1757 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1758 struct net_device *netdev = adapter->netdev;
1759 struct ixgb_tx_desc *tx_desc, *eop_desc;
1760 struct ixgb_buffer *buffer_info;
1761 unsigned int i, eop;
1762 bool cleaned = false;
1763
1764 i = tx_ring->next_to_clean;
1765 eop = tx_ring->buffer_info[i].next_to_watch;
1766 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1767
1768 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1769
1770 for (cleaned = false; !cleaned; ) {
1771 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1772 buffer_info = &tx_ring->buffer_info[i];
1773
1774 if (tx_desc->popts &
1775 (IXGB_TX_DESC_POPTS_TXSM |
1776 IXGB_TX_DESC_POPTS_IXSM))
1777 adapter->hw_csum_tx_good++;
1778
1779 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1780
1781 *(u32 *)&(tx_desc->status) = 0;
1782
1783 cleaned = (i == eop);
1784 if (++i == tx_ring->count) i = 0;
1785 }
1786
1787 eop = tx_ring->buffer_info[i].next_to_watch;
1788 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1789 }
1790
1791 tx_ring->next_to_clean = i;
1792
1793 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1794 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1795 /* Make sure that anybody stopping the queue after this
1796 * sees the new next_to_clean. */
1797 smp_mb();
1798
1799 if (netif_queue_stopped(netdev) &&
1800 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1801 netif_wake_queue(netdev);
1802 ++adapter->restart_queue;
1803 }
1804 }
1805
1806 if (adapter->detect_tx_hung) {
1807 /* detect a transmit hang in hardware, this serializes the
1808 * check with the clearing of time_stamp and movement of i */
1809 adapter->detect_tx_hung = false;
1810 if (tx_ring->buffer_info[eop].dma &&
1811 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1812 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1813 IXGB_STATUS_TXOFF)) {
1814 /* detected Tx unit hang */
1815 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1816 " TDH <%x>\n"
1817 " TDT <%x>\n"
1818 " next_to_use <%x>\n"
1819 " next_to_clean <%x>\n"
1820 "buffer_info[next_to_clean]\n"
1821 " time_stamp <%lx>\n"
1822 " next_to_watch <%x>\n"
1823 " jiffies <%lx>\n"
1824 " next_to_watch.status <%x>\n",
1825 IXGB_READ_REG(&adapter->hw, TDH),
1826 IXGB_READ_REG(&adapter->hw, TDT),
1827 tx_ring->next_to_use,
1828 tx_ring->next_to_clean,
1829 tx_ring->buffer_info[eop].time_stamp,
1830 eop,
1831 jiffies,
1832 eop_desc->status);
1833 netif_stop_queue(netdev);
1834 }
1835 }
1836
1837 return cleaned;
1838 }
1839
1840 /**
1841 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1842 * @adapter: board private structure
1843 * @rx_desc: receive descriptor
1844 * @sk_buff: socket buffer with received data
1845 **/
1846
1847 static void
1848 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1849 struct ixgb_rx_desc *rx_desc,
1850 struct sk_buff *skb)
1851 {
1852 /* Ignore Checksum bit is set OR
1853 * TCP Checksum has not been calculated
1854 */
1855 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1856 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1857 skb->ip_summed = CHECKSUM_NONE;
1858 return;
1859 }
1860
1861 /* At this point we know the hardware did the TCP checksum */
1862 /* now look at the TCP checksum error bit */
1863 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1864 /* let the stack verify checksum errors */
1865 skb->ip_summed = CHECKSUM_NONE;
1866 adapter->hw_csum_rx_error++;
1867 } else {
1868 /* TCP checksum is good */
1869 skb->ip_summed = CHECKSUM_UNNECESSARY;
1870 adapter->hw_csum_rx_good++;
1871 }
1872 }
1873
1874 /**
1875 * ixgb_clean_rx_irq - Send received data up the network stack,
1876 * @adapter: board private structure
1877 **/
1878
1879 static bool
1880 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1881 {
1882 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1883 struct net_device *netdev = adapter->netdev;
1884 struct pci_dev *pdev = adapter->pdev;
1885 struct ixgb_rx_desc *rx_desc, *next_rxd;
1886 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1887 u32 length;
1888 unsigned int i, j;
1889 int cleaned_count = 0;
1890 bool cleaned = false;
1891
1892 i = rx_ring->next_to_clean;
1893 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1894 buffer_info = &rx_ring->buffer_info[i];
1895
1896 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1897 struct sk_buff *skb;
1898 u8 status;
1899
1900 if (*work_done >= work_to_do)
1901 break;
1902
1903 (*work_done)++;
1904 status = rx_desc->status;
1905 skb = buffer_info->skb;
1906 buffer_info->skb = NULL;
1907
1908 prefetch(skb->data - NET_IP_ALIGN);
1909
1910 if (++i == rx_ring->count) i = 0;
1911 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1912 prefetch(next_rxd);
1913
1914 if ((j = i + 1) == rx_ring->count) j = 0;
1915 next2_buffer = &rx_ring->buffer_info[j];
1916 prefetch(next2_buffer);
1917
1918 next_buffer = &rx_ring->buffer_info[i];
1919
1920 cleaned = true;
1921 cleaned_count++;
1922
1923 pci_unmap_single(pdev,
1924 buffer_info->dma,
1925 buffer_info->length,
1926 PCI_DMA_FROMDEVICE);
1927 buffer_info->dma = 0;
1928
1929 length = le16_to_cpu(rx_desc->length);
1930 rx_desc->length = 0;
1931
1932 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1933
1934 /* All receives must fit into a single buffer */
1935
1936 IXGB_DBG("Receive packet consumed multiple buffers "
1937 "length<%x>\n", length);
1938
1939 dev_kfree_skb_irq(skb);
1940 goto rxdesc_done;
1941 }
1942
1943 if (unlikely(rx_desc->errors &
1944 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1945 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1946 dev_kfree_skb_irq(skb);
1947 goto rxdesc_done;
1948 }
1949
1950 /* code added for copybreak, this should improve
1951 * performance for small packets with large amounts
1952 * of reassembly being done in the stack */
1953 if (length < copybreak) {
1954 struct sk_buff *new_skb =
1955 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1956 if (new_skb) {
1957 skb_reserve(new_skb, NET_IP_ALIGN);
1958 skb_copy_to_linear_data_offset(new_skb,
1959 -NET_IP_ALIGN,
1960 (skb->data -
1961 NET_IP_ALIGN),
1962 (length +
1963 NET_IP_ALIGN));
1964 /* save the skb in buffer_info as good */
1965 buffer_info->skb = skb;
1966 skb = new_skb;
1967 }
1968 }
1969 /* end copybreak code */
1970
1971 /* Good Receive */
1972 skb_put(skb, length);
1973
1974 /* Receive Checksum Offload */
1975 ixgb_rx_checksum(adapter, rx_desc, skb);
1976
1977 skb->protocol = eth_type_trans(skb, netdev);
1978 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1979 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1980 le16_to_cpu(rx_desc->special));
1981 } else {
1982 netif_receive_skb(skb);
1983 }
1984 netdev->last_rx = jiffies;
1985
1986 rxdesc_done:
1987 /* clean up descriptor, might be written over by hw */
1988 rx_desc->status = 0;
1989
1990 /* return some buffers to hardware, one at a time is too slow */
1991 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
1992 ixgb_alloc_rx_buffers(adapter, cleaned_count);
1993 cleaned_count = 0;
1994 }
1995
1996 /* use prefetched values */
1997 rx_desc = next_rxd;
1998 buffer_info = next_buffer;
1999 }
2000
2001 rx_ring->next_to_clean = i;
2002
2003 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2004 if (cleaned_count)
2005 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2006
2007 return cleaned;
2008 }
2009
2010 /**
2011 * ixgb_alloc_rx_buffers - Replace used receive buffers
2012 * @adapter: address of board private structure
2013 **/
2014
2015 static void
2016 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2017 {
2018 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2019 struct net_device *netdev = adapter->netdev;
2020 struct pci_dev *pdev = adapter->pdev;
2021 struct ixgb_rx_desc *rx_desc;
2022 struct ixgb_buffer *buffer_info;
2023 struct sk_buff *skb;
2024 unsigned int i;
2025 long cleancount;
2026
2027 i = rx_ring->next_to_use;
2028 buffer_info = &rx_ring->buffer_info[i];
2029 cleancount = IXGB_DESC_UNUSED(rx_ring);
2030
2031
2032 /* leave three descriptors unused */
2033 while (--cleancount > 2 && cleaned_count--) {
2034 /* recycle! its good for you */
2035 skb = buffer_info->skb;
2036 if (skb) {
2037 skb_trim(skb, 0);
2038 goto map_skb;
2039 }
2040
2041 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2042 + NET_IP_ALIGN);
2043 if (unlikely(!skb)) {
2044 /* Better luck next round */
2045 adapter->alloc_rx_buff_failed++;
2046 break;
2047 }
2048
2049 /* Make buffer alignment 2 beyond a 16 byte boundary
2050 * this will result in a 16 byte aligned IP header after
2051 * the 14 byte MAC header is removed
2052 */
2053 skb_reserve(skb, NET_IP_ALIGN);
2054
2055 buffer_info->skb = skb;
2056 buffer_info->length = adapter->rx_buffer_len;
2057 map_skb:
2058 buffer_info->dma = pci_map_single(pdev,
2059 skb->data,
2060 adapter->rx_buffer_len,
2061 PCI_DMA_FROMDEVICE);
2062
2063 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2064 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2065 /* guarantee DD bit not set now before h/w gets descriptor
2066 * this is the rest of the workaround for h/w double
2067 * writeback. */
2068 rx_desc->status = 0;
2069
2070
2071 if (++i == rx_ring->count) i = 0;
2072 buffer_info = &rx_ring->buffer_info[i];
2073 }
2074
2075 if (likely(rx_ring->next_to_use != i)) {
2076 rx_ring->next_to_use = i;
2077 if (unlikely(i-- == 0))
2078 i = (rx_ring->count - 1);
2079
2080 /* Force memory writes to complete before letting h/w
2081 * know there are new descriptors to fetch. (Only
2082 * applicable for weak-ordered memory model archs, such
2083 * as IA-64). */
2084 wmb();
2085 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2086 }
2087 }
2088
2089 /**
2090 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2091 *
2092 * @param netdev network interface device structure
2093 * @param grp indicates to enable or disable tagging/stripping
2094 **/
2095 static void
2096 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2097 {
2098 struct ixgb_adapter *adapter = netdev_priv(netdev);
2099 u32 ctrl, rctl;
2100
2101 ixgb_irq_disable(adapter);
2102 adapter->vlgrp = grp;
2103
2104 if (grp) {
2105 /* enable VLAN tag insert/strip */
2106 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2107 ctrl |= IXGB_CTRL0_VME;
2108 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2109
2110 /* enable VLAN receive filtering */
2111
2112 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2113 rctl &= ~IXGB_RCTL_CFIEN;
2114 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2115 } else {
2116 /* disable VLAN tag insert/strip */
2117
2118 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2119 ctrl &= ~IXGB_CTRL0_VME;
2120 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2121 }
2122
2123 /* don't enable interrupts unless we are UP */
2124 if (adapter->netdev->flags & IFF_UP)
2125 ixgb_irq_enable(adapter);
2126 }
2127
2128 static void
2129 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2130 {
2131 struct ixgb_adapter *adapter = netdev_priv(netdev);
2132 u32 vfta, index;
2133
2134 /* add VID to filter table */
2135
2136 index = (vid >> 5) & 0x7F;
2137 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2138 vfta |= (1 << (vid & 0x1F));
2139 ixgb_write_vfta(&adapter->hw, index, vfta);
2140 }
2141
2142 static void
2143 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2144 {
2145 struct ixgb_adapter *adapter = netdev_priv(netdev);
2146 u32 vfta, index;
2147
2148 ixgb_irq_disable(adapter);
2149
2150 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2151
2152 /* don't enable interrupts unless we are UP */
2153 if (adapter->netdev->flags & IFF_UP)
2154 ixgb_irq_enable(adapter);
2155
2156 /* remove VID from filter table */
2157
2158 index = (vid >> 5) & 0x7F;
2159 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2160 vfta &= ~(1 << (vid & 0x1F));
2161 ixgb_write_vfta(&adapter->hw, index, vfta);
2162 }
2163
2164 static void
2165 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2166 {
2167 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2168
2169 if (adapter->vlgrp) {
2170 u16 vid;
2171 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2172 if (!vlan_group_get_device(adapter->vlgrp, vid))
2173 continue;
2174 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2175 }
2176 }
2177 }
2178
2179 #ifdef CONFIG_NET_POLL_CONTROLLER
2180 /*
2181 * Polling 'interrupt' - used by things like netconsole to send skbs
2182 * without having to re-enable interrupts. It's not called while
2183 * the interrupt routine is executing.
2184 */
2185
2186 static void ixgb_netpoll(struct net_device *dev)
2187 {
2188 struct ixgb_adapter *adapter = netdev_priv(dev);
2189
2190 disable_irq(adapter->pdev->irq);
2191 ixgb_intr(adapter->pdev->irq, dev);
2192 enable_irq(adapter->pdev->irq);
2193 }
2194 #endif
2195
2196 /**
2197 * ixgb_io_error_detected() - called when PCI error is detected
2198 * @pdev pointer to pci device with error
2199 * @state pci channel state after error
2200 *
2201 * This callback is called by the PCI subsystem whenever
2202 * a PCI bus error is detected.
2203 */
2204 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2205 enum pci_channel_state state)
2206 {
2207 struct net_device *netdev = pci_get_drvdata(pdev);
2208 struct ixgb_adapter *adapter = netdev_priv(netdev);
2209
2210 if (netif_running(netdev))
2211 ixgb_down(adapter, true);
2212
2213 pci_disable_device(pdev);
2214
2215 /* Request a slot reset. */
2216 return PCI_ERS_RESULT_NEED_RESET;
2217 }
2218
2219 /**
2220 * ixgb_io_slot_reset - called after the pci bus has been reset.
2221 * @pdev pointer to pci device with error
2222 *
2223 * This callback is called after the PCI bus has been reset.
2224 * Basically, this tries to restart the card from scratch.
2225 * This is a shortened version of the device probe/discovery code,
2226 * it resembles the first-half of the ixgb_probe() routine.
2227 */
2228 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2229 {
2230 struct net_device *netdev = pci_get_drvdata(pdev);
2231 struct ixgb_adapter *adapter = netdev_priv(netdev);
2232
2233 if (pci_enable_device(pdev)) {
2234 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2235 return PCI_ERS_RESULT_DISCONNECT;
2236 }
2237
2238 /* Perform card reset only on one instance of the card */
2239 if (0 != PCI_FUNC (pdev->devfn))
2240 return PCI_ERS_RESULT_RECOVERED;
2241
2242 pci_set_master(pdev);
2243
2244 netif_carrier_off(netdev);
2245 netif_stop_queue(netdev);
2246 ixgb_reset(adapter);
2247
2248 /* Make sure the EEPROM is good */
2249 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2250 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2251 return PCI_ERS_RESULT_DISCONNECT;
2252 }
2253 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2254 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2255
2256 if (!is_valid_ether_addr(netdev->perm_addr)) {
2257 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2258 return PCI_ERS_RESULT_DISCONNECT;
2259 }
2260
2261 return PCI_ERS_RESULT_RECOVERED;
2262 }
2263
2264 /**
2265 * ixgb_io_resume - called when its OK to resume normal operations
2266 * @pdev pointer to pci device with error
2267 *
2268 * The error recovery driver tells us that its OK to resume
2269 * normal operation. Implementation resembles the second-half
2270 * of the ixgb_probe() routine.
2271 */
2272 static void ixgb_io_resume(struct pci_dev *pdev)
2273 {
2274 struct net_device *netdev = pci_get_drvdata(pdev);
2275 struct ixgb_adapter *adapter = netdev_priv(netdev);
2276
2277 pci_set_master(pdev);
2278
2279 if (netif_running(netdev)) {
2280 if (ixgb_up(adapter)) {
2281 printk ("ixgb: can't bring device back up after reset\n");
2282 return;
2283 }
2284 }
2285
2286 netif_device_attach(netdev);
2287 mod_timer(&adapter->watchdog_timer, jiffies);
2288 }
2289
2290 /* ixgb_main.c */
Linux kernel - Deliverables
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