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ixgb: fix bug in descriptor ring due to prefetch corruption
[linux-2.6/mini2440.git] / drivers / net / ixgb / ixgb_main.c
blobecd5252c4bf40b5324e0659ea1d7ac072e1b05f5
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2006 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #ifndef CONFIG_IXGB_NAPI
35 #define DRIVERNAPI
36 #else
37 #define DRIVERNAPI "-NAPI"
38 #endif
39 #define DRV_VERSION "1.0.126-k4"DRIVERNAPI
40 const char ixgb_driver_version[] = DRV_VERSION;
41 static const char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
42
43 /* ixgb_pci_tbl - PCI Device ID Table
44 *
45 * Wildcard entries (PCI_ANY_ID) should come last
46 * Last entry must be all 0s
47 *
48 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
49 * Class, Class Mask, private data (not used) }
50 */
51 static struct pci_device_id ixgb_pci_tbl[] = {
52 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
53 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
54 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
55 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60
61 /* required last entry */
62 {0,}
63 };
64
65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
66
67 /* Local Function Prototypes */
68
69 int ixgb_up(struct ixgb_adapter *adapter);
70 void ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog);
71 void ixgb_reset(struct ixgb_adapter *adapter);
72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
76 void ixgb_update_stats(struct ixgb_adapter *adapter);
77
78 static int ixgb_init_module(void);
79 static void ixgb_exit_module(void);
80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
81 static void __devexit ixgb_remove(struct pci_dev *pdev);
82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
83 static int ixgb_open(struct net_device *netdev);
84 static int ixgb_close(struct net_device *netdev);
85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
90 static void ixgb_set_multi(struct net_device *netdev);
91 static void ixgb_watchdog(unsigned long data);
92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
95 static int ixgb_set_mac(struct net_device *netdev, void *p);
96 static irqreturn_t ixgb_intr(int irq, void *data);
97 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
98
99 #ifdef CONFIG_IXGB_NAPI
100 static int ixgb_clean(struct napi_struct *napi, int budget);
101 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102 int *work_done, int work_to_do);
103 #else
104 static bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 static void ixgb_tx_timeout(struct net_device *dev);
108 static void ixgb_tx_timeout_task(struct work_struct *work);
109 static void ixgb_vlan_rx_register(struct net_device *netdev,
110 struct vlan_group *grp);
111 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
112 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
113 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
114
115 #ifdef CONFIG_NET_POLL_CONTROLLER
116 /* for netdump / net console */
117 static void ixgb_netpoll(struct net_device *dev);
118 #endif
119
120 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
121 enum pci_channel_state state);
122 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
123 static void ixgb_io_resume (struct pci_dev *pdev);
124
125 static struct pci_error_handlers ixgb_err_handler = {
126 .error_detected = ixgb_io_error_detected,
127 .slot_reset = ixgb_io_slot_reset,
128 .resume = ixgb_io_resume,
129 };
130
131 static struct pci_driver ixgb_driver = {
132 .name = ixgb_driver_name,
133 .id_table = ixgb_pci_tbl,
134 .probe = ixgb_probe,
135 .remove = __devexit_p(ixgb_remove),
136 .err_handler = &ixgb_err_handler
137 };
138
139 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
140 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
141 MODULE_LICENSE("GPL");
142 MODULE_VERSION(DRV_VERSION);
143
144 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
145 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
146 module_param(debug, int, 0);
147 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
148
149 /**
150 * ixgb_init_module - Driver Registration Routine
151 *
152 * ixgb_init_module is the first routine called when the driver is
153 * loaded. All it does is register with the PCI subsystem.
154 **/
155
156 static int __init
157 ixgb_init_module(void)
158 {
159 printk(KERN_INFO "%s - version %s\n",
160 ixgb_driver_string, ixgb_driver_version);
161
162 printk(KERN_INFO "%s\n", ixgb_copyright);
163
164 return pci_register_driver(&ixgb_driver);
165 }
166
167 module_init(ixgb_init_module);
168
169 /**
170 * ixgb_exit_module - Driver Exit Cleanup Routine
171 *
172 * ixgb_exit_module is called just before the driver is removed
173 * from memory.
174 **/
175
176 static void __exit
177 ixgb_exit_module(void)
178 {
179 pci_unregister_driver(&ixgb_driver);
180 }
181
182 module_exit(ixgb_exit_module);
183
184 /**
185 * ixgb_irq_disable - Mask off interrupt generation on the NIC
186 * @adapter: board private structure
187 **/
188
189 static void
190 ixgb_irq_disable(struct ixgb_adapter *adapter)
191 {
192 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
193 IXGB_WRITE_FLUSH(&adapter->hw);
194 synchronize_irq(adapter->pdev->irq);
195 }
196
197 /**
198 * ixgb_irq_enable - Enable default interrupt generation settings
199 * @adapter: board private structure
200 **/
201
202 static void
203 ixgb_irq_enable(struct ixgb_adapter *adapter)
204 {
205 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
206 IXGB_INT_TXDW | IXGB_INT_LSC;
207 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
208 val |= IXGB_INT_GPI0;
209 IXGB_WRITE_REG(&adapter->hw, IMS, val);
210 IXGB_WRITE_FLUSH(&adapter->hw);
211 }
212
213 int
214 ixgb_up(struct ixgb_adapter *adapter)
215 {
216 struct net_device *netdev = adapter->netdev;
217 int err, irq_flags = IRQF_SHARED;
218 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
219 struct ixgb_hw *hw = &adapter->hw;
220
221 /* hardware has been reset, we need to reload some things */
222
223 ixgb_rar_set(hw, netdev->dev_addr, 0);
224 ixgb_set_multi(netdev);
225
226 ixgb_restore_vlan(adapter);
227
228 ixgb_configure_tx(adapter);
229 ixgb_setup_rctl(adapter);
230 ixgb_configure_rx(adapter);
231 ixgb_alloc_rx_buffers(adapter);
232
233 /* disable interrupts and get the hardware into a known state */
234 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
235
236 /* only enable MSI if bus is in PCI-X mode */
237 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
238 err = pci_enable_msi(adapter->pdev);
239 if (!err) {
240 adapter->have_msi = 1;
241 irq_flags = 0;
242 }
243 /* proceed to try to request regular interrupt */
244 }
245
246 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
247 netdev->name, netdev);
248 if (err) {
249 if (adapter->have_msi)
250 pci_disable_msi(adapter->pdev);
251 DPRINTK(PROBE, ERR,
252 "Unable to allocate interrupt Error: %d\n", err);
253 return err;
254 }
255
256 if((hw->max_frame_size != max_frame) ||
257 (hw->max_frame_size !=
258 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
259
260 hw->max_frame_size = max_frame;
261
262 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
263
264 if(hw->max_frame_size >
265 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
266 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
267
268 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
269 ctrl0 |= IXGB_CTRL0_JFE;
270 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
271 }
272 }
273 }
274
275 clear_bit(__IXGB_DOWN, &adapter->flags);
276
277 #ifdef CONFIG_IXGB_NAPI
278 napi_enable(&adapter->napi);
279 #endif
280 ixgb_irq_enable(adapter);
281
282 mod_timer(&adapter->watchdog_timer, jiffies);
283
284 return 0;
285 }
286
287 void
288 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
289 {
290 struct net_device *netdev = adapter->netdev;
291
292 /* prevent the interrupt handler from restarting watchdog */
293 set_bit(__IXGB_DOWN, &adapter->flags);
294
295 #ifdef CONFIG_IXGB_NAPI
296 napi_disable(&adapter->napi);
297 #endif
298 /* waiting for NAPI to complete can re-enable interrupts */
299 ixgb_irq_disable(adapter);
300 free_irq(adapter->pdev->irq, netdev);
301
302 if (adapter->have_msi)
303 pci_disable_msi(adapter->pdev);
304
305 if(kill_watchdog)
306 del_timer_sync(&adapter->watchdog_timer);
307
308 adapter->link_speed = 0;
309 adapter->link_duplex = 0;
310 netif_carrier_off(netdev);
311 netif_stop_queue(netdev);
312
313 ixgb_reset(adapter);
314 ixgb_clean_tx_ring(adapter);
315 ixgb_clean_rx_ring(adapter);
316 }
317
318 void
319 ixgb_reset(struct ixgb_adapter *adapter)
320 {
321 struct ixgb_hw *hw = &adapter->hw;
322
323 ixgb_adapter_stop(hw);
324 if (!ixgb_init_hw(hw))
325 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
326
327 /* restore frame size information */
328 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
329 if (hw->max_frame_size >
330 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
331 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
332 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
333 ctrl0 |= IXGB_CTRL0_JFE;
334 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
335 }
336 }
337 }
338
339 /**
340 * ixgb_probe - Device Initialization Routine
341 * @pdev: PCI device information struct
342 * @ent: entry in ixgb_pci_tbl
343 *
344 * Returns 0 on success, negative on failure
345 *
346 * ixgb_probe initializes an adapter identified by a pci_dev structure.
347 * The OS initialization, configuring of the adapter private structure,
348 * and a hardware reset occur.
349 **/
350
351 static int __devinit
352 ixgb_probe(struct pci_dev *pdev,
353 const struct pci_device_id *ent)
354 {
355 struct net_device *netdev = NULL;
356 struct ixgb_adapter *adapter;
357 static int cards_found = 0;
358 int pci_using_dac;
359 int i;
360 int err;
361
362 if((err = pci_enable_device(pdev)))
363 return err;
364
365 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
366 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
367 pci_using_dac = 1;
368 } else {
369 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
370 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
371 printk(KERN_ERR
372 "ixgb: No usable DMA configuration, aborting\n");
373 goto err_dma_mask;
374 }
375 pci_using_dac = 0;
376 }
377
378 if((err = pci_request_regions(pdev, ixgb_driver_name)))
379 goto err_request_regions;
380
381 pci_set_master(pdev);
382
383 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
384 if(!netdev) {
385 err = -ENOMEM;
386 goto err_alloc_etherdev;
387 }
388
389 SET_NETDEV_DEV(netdev, &pdev->dev);
390
391 pci_set_drvdata(pdev, netdev);
392 adapter = netdev_priv(netdev);
393 adapter->netdev = netdev;
394 adapter->pdev = pdev;
395 adapter->hw.back = adapter;
396 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
397
398 adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
399 pci_resource_len(pdev, BAR_0));
400 if (!adapter->hw.hw_addr) {
401 err = -EIO;
402 goto err_ioremap;
403 }
404
405 for(i = BAR_1; i <= BAR_5; i++) {
406 if(pci_resource_len(pdev, i) == 0)
407 continue;
408 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
409 adapter->hw.io_base = pci_resource_start(pdev, i);
410 break;
411 }
412 }
413
414 netdev->open = &ixgb_open;
415 netdev->stop = &ixgb_close;
416 netdev->hard_start_xmit = &ixgb_xmit_frame;
417 netdev->get_stats = &ixgb_get_stats;
418 netdev->set_multicast_list = &ixgb_set_multi;
419 netdev->set_mac_address = &ixgb_set_mac;
420 netdev->change_mtu = &ixgb_change_mtu;
421 ixgb_set_ethtool_ops(netdev);
422 netdev->tx_timeout = &ixgb_tx_timeout;
423 netdev->watchdog_timeo = 5 * HZ;
424 #ifdef CONFIG_IXGB_NAPI
425 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
426 #endif
427 netdev->vlan_rx_register = ixgb_vlan_rx_register;
428 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
429 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
430 #ifdef CONFIG_NET_POLL_CONTROLLER
431 netdev->poll_controller = ixgb_netpoll;
432 #endif
433
434 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
435
436 adapter->bd_number = cards_found;
437 adapter->link_speed = 0;
438 adapter->link_duplex = 0;
439
440 /* setup the private structure */
441
442 if((err = ixgb_sw_init(adapter)))
443 goto err_sw_init;
444
445 netdev->features = NETIF_F_SG |
446 NETIF_F_HW_CSUM |
447 NETIF_F_HW_VLAN_TX |
448 NETIF_F_HW_VLAN_RX |
449 NETIF_F_HW_VLAN_FILTER;
450 netdev->features |= NETIF_F_TSO;
451 #ifdef NETIF_F_LLTX
452 netdev->features |= NETIF_F_LLTX;
453 #endif
454
455 if(pci_using_dac)
456 netdev->features |= NETIF_F_HIGHDMA;
457
458 /* make sure the EEPROM is good */
459
460 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
461 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
462 err = -EIO;
463 goto err_eeprom;
464 }
465
466 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
467 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
468
469 if(!is_valid_ether_addr(netdev->perm_addr)) {
470 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
471 err = -EIO;
472 goto err_eeprom;
473 }
474
475 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
476
477 init_timer(&adapter->watchdog_timer);
478 adapter->watchdog_timer.function = &ixgb_watchdog;
479 adapter->watchdog_timer.data = (unsigned long)adapter;
480
481 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
482
483 strcpy(netdev->name, "eth%d");
484 if((err = register_netdev(netdev)))
485 goto err_register;
486
487 /* we're going to reset, so assume we have no link for now */
488
489 netif_carrier_off(netdev);
490 netif_stop_queue(netdev);
491
492 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
493 ixgb_check_options(adapter);
494 /* reset the hardware with the new settings */
495
496 ixgb_reset(adapter);
497
498 cards_found++;
499 return 0;
500
501 err_register:
502 err_sw_init:
503 err_eeprom:
504 iounmap(adapter->hw.hw_addr);
505 err_ioremap:
506 free_netdev(netdev);
507 err_alloc_etherdev:
508 pci_release_regions(pdev);
509 err_request_regions:
510 err_dma_mask:
511 pci_disable_device(pdev);
512 return err;
513 }
514
515 /**
516 * ixgb_remove - Device Removal Routine
517 * @pdev: PCI device information struct
518 *
519 * ixgb_remove is called by the PCI subsystem to alert the driver
520 * that it should release a PCI device. The could be caused by a
521 * Hot-Plug event, or because the driver is going to be removed from
522 * memory.
523 **/
524
525 static void __devexit
526 ixgb_remove(struct pci_dev *pdev)
527 {
528 struct net_device *netdev = pci_get_drvdata(pdev);
529 struct ixgb_adapter *adapter = netdev_priv(netdev);
530
531 unregister_netdev(netdev);
532
533 iounmap(adapter->hw.hw_addr);
534 pci_release_regions(pdev);
535
536 free_netdev(netdev);
537 }
538
539 /**
540 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
541 * @adapter: board private structure to initialize
542 *
543 * ixgb_sw_init initializes the Adapter private data structure.
544 * Fields are initialized based on PCI device information and
545 * OS network device settings (MTU size).
546 **/
547
548 static int __devinit
549 ixgb_sw_init(struct ixgb_adapter *adapter)
550 {
551 struct ixgb_hw *hw = &adapter->hw;
552 struct net_device *netdev = adapter->netdev;
553 struct pci_dev *pdev = adapter->pdev;
554
555 /* PCI config space info */
556
557 hw->vendor_id = pdev->vendor;
558 hw->device_id = pdev->device;
559 hw->subsystem_vendor_id = pdev->subsystem_vendor;
560 hw->subsystem_id = pdev->subsystem_device;
561
562 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
563 adapter->rx_buffer_len = hw->max_frame_size;
564
565 if((hw->device_id == IXGB_DEVICE_ID_82597EX)
566 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
567 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
568 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
569 hw->mac_type = ixgb_82597;
570 else {
571 /* should never have loaded on this device */
572 DPRINTK(PROBE, ERR, "unsupported device id\n");
573 }
574
575 /* enable flow control to be programmed */
576 hw->fc.send_xon = 1;
577
578 spin_lock_init(&adapter->tx_lock);
579
580 set_bit(__IXGB_DOWN, &adapter->flags);
581 return 0;
582 }
583
584 /**
585 * ixgb_open - Called when a network interface is made active
586 * @netdev: network interface device structure
587 *
588 * Returns 0 on success, negative value on failure
589 *
590 * The open entry point is called when a network interface is made
591 * active by the system (IFF_UP). At this point all resources needed
592 * for transmit and receive operations are allocated, the interrupt
593 * handler is registered with the OS, the watchdog timer is started,
594 * and the stack is notified that the interface is ready.
595 **/
596
597 static int
598 ixgb_open(struct net_device *netdev)
599 {
600 struct ixgb_adapter *adapter = netdev_priv(netdev);
601 int err;
602
603 /* allocate transmit descriptors */
604
605 if((err = ixgb_setup_tx_resources(adapter)))
606 goto err_setup_tx;
607
608 /* allocate receive descriptors */
609
610 if((err = ixgb_setup_rx_resources(adapter)))
611 goto err_setup_rx;
612
613 if((err = ixgb_up(adapter)))
614 goto err_up;
615
616 return 0;
617
618 err_up:
619 ixgb_free_rx_resources(adapter);
620 err_setup_rx:
621 ixgb_free_tx_resources(adapter);
622 err_setup_tx:
623 ixgb_reset(adapter);
624
625 return err;
626 }
627
628 /**
629 * ixgb_close - Disables a network interface
630 * @netdev: network interface device structure
631 *
632 * Returns 0, this is not allowed to fail
633 *
634 * The close entry point is called when an interface is de-activated
635 * by the OS. The hardware is still under the drivers control, but
636 * needs to be disabled. A global MAC reset is issued to stop the
637 * hardware, and all transmit and receive resources are freed.
638 **/
639
640 static int
641 ixgb_close(struct net_device *netdev)
642 {
643 struct ixgb_adapter *adapter = netdev_priv(netdev);
644
645 ixgb_down(adapter, true);
646
647 ixgb_free_tx_resources(adapter);
648 ixgb_free_rx_resources(adapter);
649
650 return 0;
651 }
652
653 /**
654 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
655 * @adapter: board private structure
656 *
657 * Return 0 on success, negative on failure
658 **/
659
660 int
661 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
662 {
663 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
664 struct pci_dev *pdev = adapter->pdev;
665 int size;
666
667 size = sizeof(struct ixgb_buffer) * txdr->count;
668 txdr->buffer_info = vmalloc(size);
669 if(!txdr->buffer_info) {
670 DPRINTK(PROBE, ERR,
671 "Unable to allocate transmit descriptor ring memory\n");
672 return -ENOMEM;
673 }
674 memset(txdr->buffer_info, 0, size);
675
676 /* round up to nearest 4K */
677
678 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
679 txdr->size = ALIGN(txdr->size, 4096);
680
681 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
682 if(!txdr->desc) {
683 vfree(txdr->buffer_info);
684 DPRINTK(PROBE, ERR,
685 "Unable to allocate transmit descriptor memory\n");
686 return -ENOMEM;
687 }
688 memset(txdr->desc, 0, txdr->size);
689
690 txdr->next_to_use = 0;
691 txdr->next_to_clean = 0;
692
693 return 0;
694 }
695
696 /**
697 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
698 * @adapter: board private structure
699 *
700 * Configure the Tx unit of the MAC after a reset.
701 **/
702
703 static void
704 ixgb_configure_tx(struct ixgb_adapter *adapter)
705 {
706 u64 tdba = adapter->tx_ring.dma;
707 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
708 u32 tctl;
709 struct ixgb_hw *hw = &adapter->hw;
710
711 /* Setup the Base and Length of the Tx Descriptor Ring
712 * tx_ring.dma can be either a 32 or 64 bit value
713 */
714
715 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
716 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
717
718 IXGB_WRITE_REG(hw, TDLEN, tdlen);
719
720 /* Setup the HW Tx Head and Tail descriptor pointers */
721
722 IXGB_WRITE_REG(hw, TDH, 0);
723 IXGB_WRITE_REG(hw, TDT, 0);
724
725 /* don't set up txdctl, it induces performance problems if configured
726 * incorrectly */
727 /* Set the Tx Interrupt Delay register */
728
729 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
730
731 /* Program the Transmit Control Register */
732
733 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
734 IXGB_WRITE_REG(hw, TCTL, tctl);
735
736 /* Setup Transmit Descriptor Settings for this adapter */
737 adapter->tx_cmd_type =
738 IXGB_TX_DESC_TYPE
739 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
740 }
741
742 /**
743 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
744 * @adapter: board private structure
745 *
746 * Returns 0 on success, negative on failure
747 **/
748
749 int
750 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
751 {
752 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
753 struct pci_dev *pdev = adapter->pdev;
754 int size;
755
756 size = sizeof(struct ixgb_buffer) * rxdr->count;
757 rxdr->buffer_info = vmalloc(size);
758 if(!rxdr->buffer_info) {
759 DPRINTK(PROBE, ERR,
760 "Unable to allocate receive descriptor ring\n");
761 return -ENOMEM;
762 }
763 memset(rxdr->buffer_info, 0, size);
764
765 /* Round up to nearest 4K */
766
767 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
768 rxdr->size = ALIGN(rxdr->size, 4096);
769
770 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
771
772 if(!rxdr->desc) {
773 vfree(rxdr->buffer_info);
774 DPRINTK(PROBE, ERR,
775 "Unable to allocate receive descriptors\n");
776 return -ENOMEM;
777 }
778 memset(rxdr->desc, 0, rxdr->size);
779
780 rxdr->next_to_clean = 0;
781 rxdr->next_to_use = 0;
782
783 return 0;
784 }
785
786 /**
787 * ixgb_setup_rctl - configure the receive control register
788 * @adapter: Board private structure
789 **/
790
791 static void
792 ixgb_setup_rctl(struct ixgb_adapter *adapter)
793 {
794 u32 rctl;
795
796 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
797
798 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
799
800 rctl |=
801 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
802 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
803 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
804
805 rctl |= IXGB_RCTL_SECRC;
806
807 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
808 rctl |= IXGB_RCTL_BSIZE_2048;
809 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
810 rctl |= IXGB_RCTL_BSIZE_4096;
811 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
812 rctl |= IXGB_RCTL_BSIZE_8192;
813 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
814 rctl |= IXGB_RCTL_BSIZE_16384;
815
816 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
817 }
818
819 /**
820 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
821 * @adapter: board private structure
822 *
823 * Configure the Rx unit of the MAC after a reset.
824 **/
825
826 static void
827 ixgb_configure_rx(struct ixgb_adapter *adapter)
828 {
829 u64 rdba = adapter->rx_ring.dma;
830 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
831 struct ixgb_hw *hw = &adapter->hw;
832 u32 rctl;
833 u32 rxcsum;
834
835 /* make sure receives are disabled while setting up the descriptors */
836
837 rctl = IXGB_READ_REG(hw, RCTL);
838 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
839
840 /* set the Receive Delay Timer Register */
841
842 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
843
844 /* Setup the Base and Length of the Rx Descriptor Ring */
845
846 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
847 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
848
849 IXGB_WRITE_REG(hw, RDLEN, rdlen);
850
851 /* Setup the HW Rx Head and Tail Descriptor Pointers */
852 IXGB_WRITE_REG(hw, RDH, 0);
853 IXGB_WRITE_REG(hw, RDT, 0);
854
855 /* due to the hardware errata with RXDCTL, we are unable to use any of
856 * the performance enhancing features of it without causing other
857 * subtle bugs, some of the bugs could include receive length
858 * corruption at high data rates (WTHRESH > 0) and/or receive
859 * descriptor ring irregularites (particularly in hardware cache) */
860 IXGB_WRITE_REG(hw, RXDCTL, 0);
861
862 /* Enable Receive Checksum Offload for TCP and UDP */
863 if (adapter->rx_csum) {
864 rxcsum = IXGB_READ_REG(hw, RXCSUM);
865 rxcsum |= IXGB_RXCSUM_TUOFL;
866 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
867 }
868
869 /* Enable Receives */
870
871 IXGB_WRITE_REG(hw, RCTL, rctl);
872 }
873
874 /**
875 * ixgb_free_tx_resources - Free Tx Resources
876 * @adapter: board private structure
877 *
878 * Free all transmit software resources
879 **/
880
881 void
882 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
883 {
884 struct pci_dev *pdev = adapter->pdev;
885
886 ixgb_clean_tx_ring(adapter);
887
888 vfree(adapter->tx_ring.buffer_info);
889 adapter->tx_ring.buffer_info = NULL;
890
891 pci_free_consistent(pdev, adapter->tx_ring.size,
892 adapter->tx_ring.desc, adapter->tx_ring.dma);
893
894 adapter->tx_ring.desc = NULL;
895 }
896
897 static void
898 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
899 struct ixgb_buffer *buffer_info)
900 {
901 struct pci_dev *pdev = adapter->pdev;
902
903 if (buffer_info->dma)
904 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
905 PCI_DMA_TODEVICE);
906
907 if (buffer_info->skb)
908 dev_kfree_skb_any(buffer_info->skb);
909
910 buffer_info->skb = NULL;
911 buffer_info->dma = 0;
912 buffer_info->time_stamp = 0;
913 /* these fields must always be initialized in tx
914 * buffer_info->length = 0;
915 * buffer_info->next_to_watch = 0; */
916 }
917
918 /**
919 * ixgb_clean_tx_ring - Free Tx Buffers
920 * @adapter: board private structure
921 **/
922
923 static void
924 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
925 {
926 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
927 struct ixgb_buffer *buffer_info;
928 unsigned long size;
929 unsigned int i;
930
931 /* Free all the Tx ring sk_buffs */
932
933 for(i = 0; i < tx_ring->count; i++) {
934 buffer_info = &tx_ring->buffer_info[i];
935 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
936 }
937
938 size = sizeof(struct ixgb_buffer) * tx_ring->count;
939 memset(tx_ring->buffer_info, 0, size);
940
941 /* Zero out the descriptor ring */
942
943 memset(tx_ring->desc, 0, tx_ring->size);
944
945 tx_ring->next_to_use = 0;
946 tx_ring->next_to_clean = 0;
947
948 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
949 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
950 }
951
952 /**
953 * ixgb_free_rx_resources - Free Rx Resources
954 * @adapter: board private structure
955 *
956 * Free all receive software resources
957 **/
958
959 void
960 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
961 {
962 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
963 struct pci_dev *pdev = adapter->pdev;
964
965 ixgb_clean_rx_ring(adapter);
966
967 vfree(rx_ring->buffer_info);
968 rx_ring->buffer_info = NULL;
969
970 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
971
972 rx_ring->desc = NULL;
973 }
974
975 /**
976 * ixgb_clean_rx_ring - Free Rx Buffers
977 * @adapter: board private structure
978 **/
979
980 static void
981 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
982 {
983 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
984 struct ixgb_buffer *buffer_info;
985 struct pci_dev *pdev = adapter->pdev;
986 unsigned long size;
987 unsigned int i;
988
989 /* Free all the Rx ring sk_buffs */
990
991 for(i = 0; i < rx_ring->count; i++) {
992 buffer_info = &rx_ring->buffer_info[i];
993 if(buffer_info->skb) {
994
995 pci_unmap_single(pdev,
996 buffer_info->dma,
997 buffer_info->length,
998 PCI_DMA_FROMDEVICE);
999
1000 dev_kfree_skb(buffer_info->skb);
1001
1002 buffer_info->skb = NULL;
1003 }
1004 }
1005
1006 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1007 memset(rx_ring->buffer_info, 0, size);
1008
1009 /* Zero out the descriptor ring */
1010
1011 memset(rx_ring->desc, 0, rx_ring->size);
1012
1013 rx_ring->next_to_clean = 0;
1014 rx_ring->next_to_use = 0;
1015
1016 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1017 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1018 }
1019
1020 /**
1021 * ixgb_set_mac - Change the Ethernet Address of the NIC
1022 * @netdev: network interface device structure
1023 * @p: pointer to an address structure
1024 *
1025 * Returns 0 on success, negative on failure
1026 **/
1027
1028 static int
1029 ixgb_set_mac(struct net_device *netdev, void *p)
1030 {
1031 struct ixgb_adapter *adapter = netdev_priv(netdev);
1032 struct sockaddr *addr = p;
1033
1034 if(!is_valid_ether_addr(addr->sa_data))
1035 return -EADDRNOTAVAIL;
1036
1037 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1038
1039 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1040
1041 return 0;
1042 }
1043
1044 /**
1045 * ixgb_set_multi - Multicast and Promiscuous mode set
1046 * @netdev: network interface device structure
1047 *
1048 * The set_multi entry point is called whenever the multicast address
1049 * list or the network interface flags are updated. This routine is
1050 * responsible for configuring the hardware for proper multicast,
1051 * promiscuous mode, and all-multi behavior.
1052 **/
1053
1054 static void
1055 ixgb_set_multi(struct net_device *netdev)
1056 {
1057 struct ixgb_adapter *adapter = netdev_priv(netdev);
1058 struct ixgb_hw *hw = &adapter->hw;
1059 struct dev_mc_list *mc_ptr;
1060 u32 rctl;
1061 int i;
1062
1063 /* Check for Promiscuous and All Multicast modes */
1064
1065 rctl = IXGB_READ_REG(hw, RCTL);
1066
1067 if(netdev->flags & IFF_PROMISC) {
1068 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1069 } else if(netdev->flags & IFF_ALLMULTI) {
1070 rctl |= IXGB_RCTL_MPE;
1071 rctl &= ~IXGB_RCTL_UPE;
1072 } else {
1073 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1074 }
1075
1076 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1077 rctl |= IXGB_RCTL_MPE;
1078 IXGB_WRITE_REG(hw, RCTL, rctl);
1079 } else {
1080 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1081 IXGB_ETH_LENGTH_OF_ADDRESS];
1082
1083 IXGB_WRITE_REG(hw, RCTL, rctl);
1084
1085 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1086 i++, mc_ptr = mc_ptr->next)
1087 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1088 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1089
1090 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1091 }
1092 }
1093
1094 /**
1095 * ixgb_watchdog - Timer Call-back
1096 * @data: pointer to netdev cast into an unsigned long
1097 **/
1098
1099 static void
1100 ixgb_watchdog(unsigned long data)
1101 {
1102 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1103 struct net_device *netdev = adapter->netdev;
1104 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1105
1106 ixgb_check_for_link(&adapter->hw);
1107
1108 if (ixgb_check_for_bad_link(&adapter->hw)) {
1109 /* force the reset path */
1110 netif_stop_queue(netdev);
1111 }
1112
1113 if(adapter->hw.link_up) {
1114 if(!netif_carrier_ok(netdev)) {
1115 DPRINTK(LINK, INFO,
1116 "NIC Link is Up 10000 Mbps Full Duplex\n");
1117 adapter->link_speed = 10000;
1118 adapter->link_duplex = FULL_DUPLEX;
1119 netif_carrier_on(netdev);
1120 netif_wake_queue(netdev);
1121 }
1122 } else {
1123 if(netif_carrier_ok(netdev)) {
1124 adapter->link_speed = 0;
1125 adapter->link_duplex = 0;
1126 DPRINTK(LINK, INFO, "NIC Link is Down\n");
1127 netif_carrier_off(netdev);
1128 netif_stop_queue(netdev);
1129
1130 }
1131 }
1132
1133 ixgb_update_stats(adapter);
1134
1135 if(!netif_carrier_ok(netdev)) {
1136 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1137 /* We've lost link, so the controller stops DMA,
1138 * but we've got queued Tx work that's never going
1139 * to get done, so reset controller to flush Tx.
1140 * (Do the reset outside of interrupt context). */
1141 schedule_work(&adapter->tx_timeout_task);
1142 }
1143 }
1144
1145 /* Force detection of hung controller every watchdog period */
1146 adapter->detect_tx_hung = true;
1147
1148 /* generate an interrupt to force clean up of any stragglers */
1149 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1150
1151 /* Reset the timer */
1152 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1153 }
1154
1155 #define IXGB_TX_FLAGS_CSUM 0x00000001
1156 #define IXGB_TX_FLAGS_VLAN 0x00000002
1157 #define IXGB_TX_FLAGS_TSO 0x00000004
1158
1159 static int
1160 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1161 {
1162 struct ixgb_context_desc *context_desc;
1163 unsigned int i;
1164 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1165 u16 ipcse, tucse, mss;
1166 int err;
1167
1168 if (likely(skb_is_gso(skb))) {
1169 struct ixgb_buffer *buffer_info;
1170 struct iphdr *iph;
1171
1172 if (skb_header_cloned(skb)) {
1173 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1174 if (err)
1175 return err;
1176 }
1177
1178 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1179 mss = skb_shinfo(skb)->gso_size;
1180 iph = ip_hdr(skb);
1181 iph->tot_len = 0;
1182 iph->check = 0;
1183 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1184 iph->daddr, 0,
1185 IPPROTO_TCP, 0);
1186 ipcss = skb_network_offset(skb);
1187 ipcso = (void *)&(iph->check) - (void *)skb->data;
1188 ipcse = skb_transport_offset(skb) - 1;
1189 tucss = skb_transport_offset(skb);
1190 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1191 tucse = 0;
1192
1193 i = adapter->tx_ring.next_to_use;
1194 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1195 buffer_info = &adapter->tx_ring.buffer_info[i];
1196 WARN_ON(buffer_info->dma != 0);
1197
1198 context_desc->ipcss = ipcss;
1199 context_desc->ipcso = ipcso;
1200 context_desc->ipcse = cpu_to_le16(ipcse);
1201 context_desc->tucss = tucss;
1202 context_desc->tucso = tucso;
1203 context_desc->tucse = cpu_to_le16(tucse);
1204 context_desc->mss = cpu_to_le16(mss);
1205 context_desc->hdr_len = hdr_len;
1206 context_desc->status = 0;
1207 context_desc->cmd_type_len = cpu_to_le32(
1208 IXGB_CONTEXT_DESC_TYPE
1209 | IXGB_CONTEXT_DESC_CMD_TSE
1210 | IXGB_CONTEXT_DESC_CMD_IP
1211 | IXGB_CONTEXT_DESC_CMD_TCP
1212 | IXGB_CONTEXT_DESC_CMD_IDE
1213 | (skb->len - (hdr_len)));
1214
1215
1216 if(++i == adapter->tx_ring.count) i = 0;
1217 adapter->tx_ring.next_to_use = i;
1218
1219 return 1;
1220 }
1221
1222 return 0;
1223 }
1224
1225 static bool
1226 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1227 {
1228 struct ixgb_context_desc *context_desc;
1229 unsigned int i;
1230 u8 css, cso;
1231
1232 if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1233 struct ixgb_buffer *buffer_info;
1234 css = skb_transport_offset(skb);
1235 cso = css + skb->csum_offset;
1236
1237 i = adapter->tx_ring.next_to_use;
1238 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1239 buffer_info = &adapter->tx_ring.buffer_info[i];
1240 WARN_ON(buffer_info->dma != 0);
1241
1242 context_desc->tucss = css;
1243 context_desc->tucso = cso;
1244 context_desc->tucse = 0;
1245 /* zero out any previously existing data in one instruction */
1246 *(u32 *)&(context_desc->ipcss) = 0;
1247 context_desc->status = 0;
1248 context_desc->hdr_len = 0;
1249 context_desc->mss = 0;
1250 context_desc->cmd_type_len =
1251 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252 | IXGB_TX_DESC_CMD_IDE);
1253
1254 if(++i == adapter->tx_ring.count) i = 0;
1255 adapter->tx_ring.next_to_use = i;
1256
1257 return true;
1258 }
1259
1260 return false;
1261 }
1262
1263 #define IXGB_MAX_TXD_PWR 14
1264 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1265
1266 static int
1267 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1268 unsigned int first)
1269 {
1270 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1271 struct ixgb_buffer *buffer_info;
1272 int len = skb->len;
1273 unsigned int offset = 0, size, count = 0, i;
1274 unsigned int mss = skb_shinfo(skb)->gso_size;
1275
1276 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1277 unsigned int f;
1278
1279 len -= skb->data_len;
1280
1281 i = tx_ring->next_to_use;
1282
1283 while(len) {
1284 buffer_info = &tx_ring->buffer_info[i];
1285 size = min(len, IXGB_MAX_DATA_PER_TXD);
1286 /* Workaround for premature desc write-backs
1287 * in TSO mode. Append 4-byte sentinel desc */
1288 if (unlikely(mss && !nr_frags && size == len && size > 8))
1289 size -= 4;
1290
1291 buffer_info->length = size;
1292 WARN_ON(buffer_info->dma != 0);
1293 buffer_info->dma =
1294 pci_map_single(adapter->pdev,
1295 skb->data + offset,
1296 size,
1297 PCI_DMA_TODEVICE);
1298 buffer_info->time_stamp = jiffies;
1299 buffer_info->next_to_watch = 0;
1300
1301 len -= size;
1302 offset += size;
1303 count++;
1304 if(++i == tx_ring->count) i = 0;
1305 }
1306
1307 for(f = 0; f < nr_frags; f++) {
1308 struct skb_frag_struct *frag;
1309
1310 frag = &skb_shinfo(skb)->frags[f];
1311 len = frag->size;
1312 offset = 0;
1313
1314 while(len) {
1315 buffer_info = &tx_ring->buffer_info[i];
1316 size = min(len, IXGB_MAX_DATA_PER_TXD);
1317
1318 /* Workaround for premature desc write-backs
1319 * in TSO mode. Append 4-byte sentinel desc */
1320 if (unlikely(mss && (f == (nr_frags - 1))
1321 && size == len && size > 8))
1322 size -= 4;
1323
1324 buffer_info->length = size;
1325 buffer_info->dma =
1326 pci_map_page(adapter->pdev,
1327 frag->page,
1328 frag->page_offset + offset,
1329 size,
1330 PCI_DMA_TODEVICE);
1331 buffer_info->time_stamp = jiffies;
1332 buffer_info->next_to_watch = 0;
1333
1334 len -= size;
1335 offset += size;
1336 count++;
1337 if(++i == tx_ring->count) i = 0;
1338 }
1339 }
1340 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1341 tx_ring->buffer_info[i].skb = skb;
1342 tx_ring->buffer_info[first].next_to_watch = i;
1343
1344 return count;
1345 }
1346
1347 static void
1348 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1349 {
1350 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1351 struct ixgb_tx_desc *tx_desc = NULL;
1352 struct ixgb_buffer *buffer_info;
1353 u32 cmd_type_len = adapter->tx_cmd_type;
1354 u8 status = 0;
1355 u8 popts = 0;
1356 unsigned int i;
1357
1358 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1359 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1360 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1361 }
1362
1363 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1364 popts |= IXGB_TX_DESC_POPTS_TXSM;
1365
1366 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1367 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1368 }
1369
1370 i = tx_ring->next_to_use;
1371
1372 while(count--) {
1373 buffer_info = &tx_ring->buffer_info[i];
1374 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1375 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1376 tx_desc->cmd_type_len =
1377 cpu_to_le32(cmd_type_len | buffer_info->length);
1378 tx_desc->status = status;
1379 tx_desc->popts = popts;
1380 tx_desc->vlan = cpu_to_le16(vlan_id);
1381
1382 if(++i == tx_ring->count) i = 0;
1383 }
1384
1385 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1386 | IXGB_TX_DESC_CMD_RS );
1387
1388 /* Force memory writes to complete before letting h/w
1389 * know there are new descriptors to fetch. (Only
1390 * applicable for weak-ordered memory model archs,
1391 * such as IA-64). */
1392 wmb();
1393
1394 tx_ring->next_to_use = i;
1395 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1396 }
1397
1398 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1399 {
1400 struct ixgb_adapter *adapter = netdev_priv(netdev);
1401 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1402
1403 netif_stop_queue(netdev);
1404 /* Herbert's original patch had:
1405 * smp_mb__after_netif_stop_queue();
1406 * but since that doesn't exist yet, just open code it. */
1407 smp_mb();
1408
1409 /* We need to check again in a case another CPU has just
1410 * made room available. */
1411 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1412 return -EBUSY;
1413
1414 /* A reprieve! */
1415 netif_start_queue(netdev);
1416 ++adapter->restart_queue;
1417 return 0;
1418 }
1419
1420 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1421 struct ixgb_desc_ring *tx_ring, int size)
1422 {
1423 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1424 return 0;
1425 return __ixgb_maybe_stop_tx(netdev, size);
1426 }
1427
1428
1429 /* Tx Descriptors needed, worst case */
1430 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1431 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1432 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1433 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1434 + 1 /* one more needed for sentinel TSO workaround */
1435
1436 static int
1437 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1438 {
1439 struct ixgb_adapter *adapter = netdev_priv(netdev);
1440 unsigned int first;
1441 unsigned int tx_flags = 0;
1442 unsigned long flags;
1443 int vlan_id = 0;
1444 int tso;
1445
1446 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1447 dev_kfree_skb(skb);
1448 return NETDEV_TX_OK;
1449 }
1450
1451 if(skb->len <= 0) {
1452 dev_kfree_skb_any(skb);
1453 return 0;
1454 }
1455
1456 #ifdef NETIF_F_LLTX
1457 if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
1458 /* Collision - tell upper layer to requeue */
1459 local_irq_restore(flags);
1460 return NETDEV_TX_LOCKED;
1461 }
1462 #else
1463 spin_lock_irqsave(&adapter->tx_lock, flags);
1464 #endif
1465
1466 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1467 DESC_NEEDED))) {
1468 netif_stop_queue(netdev);
1469 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1470 return NETDEV_TX_BUSY;
1471 }
1472
1473 #ifndef NETIF_F_LLTX
1474 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1475 #endif
1476
1477 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1478 tx_flags |= IXGB_TX_FLAGS_VLAN;
1479 vlan_id = vlan_tx_tag_get(skb);
1480 }
1481
1482 first = adapter->tx_ring.next_to_use;
1483
1484 tso = ixgb_tso(adapter, skb);
1485 if (tso < 0) {
1486 dev_kfree_skb_any(skb);
1487 #ifdef NETIF_F_LLTX
1488 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1489 #endif
1490 return NETDEV_TX_OK;
1491 }
1492
1493 if (likely(tso))
1494 tx_flags |= IXGB_TX_FLAGS_TSO;
1495 else if(ixgb_tx_csum(adapter, skb))
1496 tx_flags |= IXGB_TX_FLAGS_CSUM;
1497
1498 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1499 tx_flags);
1500
1501 netdev->trans_start = jiffies;
1502
1503 #ifdef NETIF_F_LLTX
1504 /* Make sure there is space in the ring for the next send. */
1505 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1506
1507 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1508
1509 #endif
1510 return NETDEV_TX_OK;
1511 }
1512
1513 /**
1514 * ixgb_tx_timeout - Respond to a Tx Hang
1515 * @netdev: network interface device structure
1516 **/
1517
1518 static void
1519 ixgb_tx_timeout(struct net_device *netdev)
1520 {
1521 struct ixgb_adapter *adapter = netdev_priv(netdev);
1522
1523 /* Do the reset outside of interrupt context */
1524 schedule_work(&adapter->tx_timeout_task);
1525 }
1526
1527 static void
1528 ixgb_tx_timeout_task(struct work_struct *work)
1529 {
1530 struct ixgb_adapter *adapter =
1531 container_of(work, struct ixgb_adapter, tx_timeout_task);
1532
1533 adapter->tx_timeout_count++;
1534 ixgb_down(adapter, true);
1535 ixgb_up(adapter);
1536 }
1537
1538 /**
1539 * ixgb_get_stats - Get System Network Statistics
1540 * @netdev: network interface device structure
1541 *
1542 * Returns the address of the device statistics structure.
1543 * The statistics are actually updated from the timer callback.
1544 **/
1545
1546 static struct net_device_stats *
1547 ixgb_get_stats(struct net_device *netdev)
1548 {
1549 struct ixgb_adapter *adapter = netdev_priv(netdev);
1550
1551 return &adapter->net_stats;
1552 }
1553
1554 /**
1555 * ixgb_change_mtu - Change the Maximum Transfer Unit
1556 * @netdev: network interface device structure
1557 * @new_mtu: new value for maximum frame size
1558 *
1559 * Returns 0 on success, negative on failure
1560 **/
1561
1562 static int
1563 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1564 {
1565 struct ixgb_adapter *adapter = netdev_priv(netdev);
1566 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1567 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1568
1569
1570 if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1571 || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1572 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1573 return -EINVAL;
1574 }
1575
1576 adapter->rx_buffer_len = max_frame;
1577
1578 netdev->mtu = new_mtu;
1579
1580 if ((old_max_frame != max_frame) && netif_running(netdev)) {
1581 ixgb_down(adapter, true);
1582 ixgb_up(adapter);
1583 }
1584
1585 return 0;
1586 }
1587
1588 /**
1589 * ixgb_update_stats - Update the board statistics counters.
1590 * @adapter: board private structure
1591 **/
1592
1593 void
1594 ixgb_update_stats(struct ixgb_adapter *adapter)
1595 {
1596 struct net_device *netdev = adapter->netdev;
1597 struct pci_dev *pdev = adapter->pdev;
1598
1599 /* Prevent stats update while adapter is being reset */
1600 if (pci_channel_offline(pdev))
1601 return;
1602
1603 if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1604 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1605 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1606 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1607 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1608 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1609
1610 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1611 /* fix up multicast stats by removing broadcasts */
1612 if(multi >= bcast)
1613 multi -= bcast;
1614
1615 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1616 adapter->stats.mprch += (multi >> 32);
1617 adapter->stats.bprcl += bcast_l;
1618 adapter->stats.bprch += bcast_h;
1619 } else {
1620 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1621 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1622 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1623 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1624 }
1625 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1626 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1627 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1628 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1629 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1630 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1631 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1632 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1633 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1634 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1635 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1636 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1637 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1638 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1639 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1640 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1641 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1642 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1643 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1644 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1645 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1646 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1647 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1648 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1649 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1650 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1651 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1652 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1653 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1654 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1655 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1656 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1657 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1658 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1659 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1660 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1661 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1662 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1663 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1664 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1665 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1666 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1667 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1668 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1669 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1670 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1671 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1672 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1673 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1674 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1675 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1676 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1677 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1678 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1679 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1680 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1681
1682 /* Fill out the OS statistics structure */
1683
1684 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1685 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1686 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1687 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1688 adapter->net_stats.multicast = adapter->stats.mprcl;
1689 adapter->net_stats.collisions = 0;
1690
1691 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1692 * with a length in the type/len field */
1693 adapter->net_stats.rx_errors =
1694 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1695 adapter->stats.ruc +
1696 adapter->stats.roc /*+ adapter->stats.rlec */ +
1697 adapter->stats.icbc +
1698 adapter->stats.ecbc + adapter->stats.mpc;
1699
1700 /* see above
1701 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1702 */
1703
1704 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1705 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1706 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1707 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1708
1709 adapter->net_stats.tx_errors = 0;
1710 adapter->net_stats.rx_frame_errors = 0;
1711 adapter->net_stats.tx_aborted_errors = 0;
1712 adapter->net_stats.tx_carrier_errors = 0;
1713 adapter->net_stats.tx_fifo_errors = 0;
1714 adapter->net_stats.tx_heartbeat_errors = 0;
1715 adapter->net_stats.tx_window_errors = 0;
1716 }
1717
1718 #define IXGB_MAX_INTR 10
1719 /**
1720 * ixgb_intr - Interrupt Handler
1721 * @irq: interrupt number
1722 * @data: pointer to a network interface device structure
1723 **/
1724
1725 static irqreturn_t
1726 ixgb_intr(int irq, void *data)
1727 {
1728 struct net_device *netdev = data;
1729 struct ixgb_adapter *adapter = netdev_priv(netdev);
1730 struct ixgb_hw *hw = &adapter->hw;
1731 u32 icr = IXGB_READ_REG(hw, ICR);
1732 #ifndef CONFIG_IXGB_NAPI
1733 unsigned int i;
1734 #endif
1735
1736 if(unlikely(!icr))
1737 return IRQ_NONE; /* Not our interrupt */
1738
1739 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1740 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1741 mod_timer(&adapter->watchdog_timer, jiffies);
1742
1743 #ifdef CONFIG_IXGB_NAPI
1744 if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1745
1746 /* Disable interrupts and register for poll. The flush
1747 of the posted write is intentionally left out.
1748 */
1749
1750 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1751 __netif_rx_schedule(netdev, &adapter->napi);
1752 }
1753 #else
1754 /* yes, that is actually a & and it is meant to make sure that
1755 * every pass through this for loop checks both receive and
1756 * transmit queues for completed descriptors, intended to
1757 * avoid starvation issues and assist tx/rx fairness. */
1758 for(i = 0; i < IXGB_MAX_INTR; i++)
1759 if(!ixgb_clean_rx_irq(adapter) &
1760 !ixgb_clean_tx_irq(adapter))
1761 break;
1762 #endif
1763 return IRQ_HANDLED;
1764 }
1765
1766 #ifdef CONFIG_IXGB_NAPI
1767 /**
1768 * ixgb_clean - NAPI Rx polling callback
1769 * @adapter: board private structure
1770 **/
1771
1772 static int
1773 ixgb_clean(struct napi_struct *napi, int budget)
1774 {
1775 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1776 struct net_device *netdev = adapter->netdev;
1777 int work_done = 0;
1778
1779 ixgb_clean_tx_irq(adapter);
1780 ixgb_clean_rx_irq(adapter, &work_done, budget);
1781
1782 /* If budget not fully consumed, exit the polling mode */
1783 if (work_done < budget) {
1784 netif_rx_complete(netdev, napi);
1785 ixgb_irq_enable(adapter);
1786 }
1787
1788 return work_done;
1789 }
1790 #endif
1791
1792 /**
1793 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1794 * @adapter: board private structure
1795 **/
1796
1797 static bool
1798 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1799 {
1800 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1801 struct net_device *netdev = adapter->netdev;
1802 struct ixgb_tx_desc *tx_desc, *eop_desc;
1803 struct ixgb_buffer *buffer_info;
1804 unsigned int i, eop;
1805 bool cleaned = false;
1806
1807 i = tx_ring->next_to_clean;
1808 eop = tx_ring->buffer_info[i].next_to_watch;
1809 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1810
1811 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1812
1813 for (cleaned = false; !cleaned; ) {
1814 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1815 buffer_info = &tx_ring->buffer_info[i];
1816
1817 if (tx_desc->popts
1818 & (IXGB_TX_DESC_POPTS_TXSM |
1819 IXGB_TX_DESC_POPTS_IXSM))
1820 adapter->hw_csum_tx_good++;
1821
1822 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1823
1824 *(u32 *)&(tx_desc->status) = 0;
1825
1826 cleaned = (i == eop);
1827 if(++i == tx_ring->count) i = 0;
1828 }
1829
1830 eop = tx_ring->buffer_info[i].next_to_watch;
1831 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1832 }
1833
1834 tx_ring->next_to_clean = i;
1835
1836 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1837 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1838 /* Make sure that anybody stopping the queue after this
1839 * sees the new next_to_clean. */
1840 smp_mb();
1841
1842 if (netif_queue_stopped(netdev) &&
1843 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1844 netif_wake_queue(netdev);
1845 ++adapter->restart_queue;
1846 }
1847 }
1848
1849 if(adapter->detect_tx_hung) {
1850 /* detect a transmit hang in hardware, this serializes the
1851 * check with the clearing of time_stamp and movement of i */
1852 adapter->detect_tx_hung = false;
1853 if (tx_ring->buffer_info[eop].dma &&
1854 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1855 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1856 IXGB_STATUS_TXOFF)) {
1857 /* detected Tx unit hang */
1858 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1859 " TDH <%x>\n"
1860 " TDT <%x>\n"
1861 " next_to_use <%x>\n"
1862 " next_to_clean <%x>\n"
1863 "buffer_info[next_to_clean]\n"
1864 " time_stamp <%lx>\n"
1865 " next_to_watch <%x>\n"
1866 " jiffies <%lx>\n"
1867 " next_to_watch.status <%x>\n",
1868 IXGB_READ_REG(&adapter->hw, TDH),
1869 IXGB_READ_REG(&adapter->hw, TDT),
1870 tx_ring->next_to_use,
1871 tx_ring->next_to_clean,
1872 tx_ring->buffer_info[eop].time_stamp,
1873 eop,
1874 jiffies,
1875 eop_desc->status);
1876 netif_stop_queue(netdev);
1877 }
1878 }
1879
1880 return cleaned;
1881 }
1882
1883 /**
1884 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1885 * @adapter: board private structure
1886 * @rx_desc: receive descriptor
1887 * @sk_buff: socket buffer with received data
1888 **/
1889
1890 static void
1891 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1892 struct ixgb_rx_desc *rx_desc,
1893 struct sk_buff *skb)
1894 {
1895 /* Ignore Checksum bit is set OR
1896 * TCP Checksum has not been calculated
1897 */
1898 if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1899 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1900 skb->ip_summed = CHECKSUM_NONE;
1901 return;
1902 }
1903
1904 /* At this point we know the hardware did the TCP checksum */
1905 /* now look at the TCP checksum error bit */
1906 if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1907 /* let the stack verify checksum errors */
1908 skb->ip_summed = CHECKSUM_NONE;
1909 adapter->hw_csum_rx_error++;
1910 } else {
1911 /* TCP checksum is good */
1912 skb->ip_summed = CHECKSUM_UNNECESSARY;
1913 adapter->hw_csum_rx_good++;
1914 }
1915 }
1916
1917 /**
1918 * ixgb_clean_rx_irq - Send received data up the network stack,
1919 * @adapter: board private structure
1920 **/
1921
1922 static bool
1923 #ifdef CONFIG_IXGB_NAPI
1924 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1925 #else
1926 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1927 #endif
1928 {
1929 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1930 struct net_device *netdev = adapter->netdev;
1931 struct pci_dev *pdev = adapter->pdev;
1932 struct ixgb_rx_desc *rx_desc, *next_rxd;
1933 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1934 u32 length;
1935 unsigned int i, j;
1936 bool cleaned = false;
1937
1938 i = rx_ring->next_to_clean;
1939 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1940 buffer_info = &rx_ring->buffer_info[i];
1941
1942 while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1943 struct sk_buff *skb, *next_skb;
1944 u8 status;
1945
1946 #ifdef CONFIG_IXGB_NAPI
1947 if(*work_done >= work_to_do)
1948 break;
1949
1950 (*work_done)++;
1951 #endif
1952 status = rx_desc->status;
1953 skb = buffer_info->skb;
1954 buffer_info->skb = NULL;
1955
1956 prefetch(skb->data);
1957
1958 if(++i == rx_ring->count) i = 0;
1959 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1960 prefetch(next_rxd);
1961
1962 if((j = i + 1) == rx_ring->count) j = 0;
1963 next2_buffer = &rx_ring->buffer_info[j];
1964 prefetch(next2_buffer);
1965
1966 next_buffer = &rx_ring->buffer_info[i];
1967 next_skb = next_buffer->skb;
1968 prefetch(next_skb);
1969
1970 cleaned = true;
1971
1972 pci_unmap_single(pdev,
1973 buffer_info->dma,
1974 buffer_info->length,
1975 PCI_DMA_FROMDEVICE);
1976
1977 length = le16_to_cpu(rx_desc->length);
1978
1979 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1980
1981 /* All receives must fit into a single buffer */
1982
1983 IXGB_DBG("Receive packet consumed multiple buffers "
1984 "length<%x>\n", length);
1985
1986 dev_kfree_skb_irq(skb);
1987 goto rxdesc_done;
1988 }
1989
1990 if (unlikely(rx_desc->errors
1991 & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1992 | IXGB_RX_DESC_ERRORS_P |
1993 IXGB_RX_DESC_ERRORS_RXE))) {
1994
1995 dev_kfree_skb_irq(skb);
1996 goto rxdesc_done;
1997 }
1998
1999 /* code added for copybreak, this should improve
2000 * performance for small packets with large amounts
2001 * of reassembly being done in the stack */
2002 #define IXGB_CB_LENGTH 256
2003 if (length < IXGB_CB_LENGTH) {
2004 struct sk_buff *new_skb =
2005 netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2006 if (new_skb) {
2007 skb_reserve(new_skb, NET_IP_ALIGN);
2008 skb_copy_to_linear_data_offset(new_skb,
2009 -NET_IP_ALIGN,
2010 (skb->data -
2011 NET_IP_ALIGN),
2012 (length +
2013 NET_IP_ALIGN));
2014 /* save the skb in buffer_info as good */
2015 buffer_info->skb = skb;
2016 skb = new_skb;
2017 }
2018 }
2019 /* end copybreak code */
2020
2021 /* Good Receive */
2022 skb_put(skb, length);
2023
2024 /* Receive Checksum Offload */
2025 ixgb_rx_checksum(adapter, rx_desc, skb);
2026
2027 skb->protocol = eth_type_trans(skb, netdev);
2028 #ifdef CONFIG_IXGB_NAPI
2029 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2030 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2031 le16_to_cpu(rx_desc->special));
2032 } else {
2033 netif_receive_skb(skb);
2034 }
2035 #else /* CONFIG_IXGB_NAPI */
2036 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2037 vlan_hwaccel_rx(skb, adapter->vlgrp,
2038 le16_to_cpu(rx_desc->special));
2039 } else {
2040 netif_rx(skb);
2041 }
2042 #endif /* CONFIG_IXGB_NAPI */
2043 netdev->last_rx = jiffies;
2044
2045 rxdesc_done:
2046 /* clean up descriptor, might be written over by hw */
2047 rx_desc->status = 0;
2048
2049 /* use prefetched values */
2050 rx_desc = next_rxd;
2051 buffer_info = next_buffer;
2052 }
2053
2054 rx_ring->next_to_clean = i;
2055
2056 ixgb_alloc_rx_buffers(adapter);
2057
2058 return cleaned;
2059 }
2060
2061 /**
2062 * ixgb_alloc_rx_buffers - Replace used receive buffers
2063 * @adapter: address of board private structure
2064 **/
2065
2066 static void
2067 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2068 {
2069 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2070 struct net_device *netdev = adapter->netdev;
2071 struct pci_dev *pdev = adapter->pdev;
2072 struct ixgb_rx_desc *rx_desc;
2073 struct ixgb_buffer *buffer_info;
2074 struct sk_buff *skb;
2075 unsigned int i;
2076 long cleancount;
2077
2078 i = rx_ring->next_to_use;
2079 buffer_info = &rx_ring->buffer_info[i];
2080 cleancount = IXGB_DESC_UNUSED(rx_ring);
2081
2082
2083 /* leave three descriptors unused */
2084 while(--cleancount > 2) {
2085 /* recycle! its good for you */
2086 skb = buffer_info->skb;
2087 if (skb) {
2088 skb_trim(skb, 0);
2089 goto map_skb;
2090 }
2091
2092 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2093 + NET_IP_ALIGN);
2094 if (unlikely(!skb)) {
2095 /* Better luck next round */
2096 adapter->alloc_rx_buff_failed++;
2097 break;
2098 }
2099
2100 /* Make buffer alignment 2 beyond a 16 byte boundary
2101 * this will result in a 16 byte aligned IP header after
2102 * the 14 byte MAC header is removed
2103 */
2104 skb_reserve(skb, NET_IP_ALIGN);
2105
2106 buffer_info->skb = skb;
2107 buffer_info->length = adapter->rx_buffer_len;
2108 map_skb:
2109 buffer_info->dma = pci_map_single(pdev,
2110 skb->data,
2111 adapter->rx_buffer_len,
2112 PCI_DMA_FROMDEVICE);
2113
2114 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2115 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2116 /* guarantee DD bit not set now before h/w gets descriptor
2117 * this is the rest of the workaround for h/w double
2118 * writeback. */
2119 rx_desc->status = 0;
2120
2121
2122 if(++i == rx_ring->count) i = 0;
2123 buffer_info = &rx_ring->buffer_info[i];
2124 }
2125
2126 if (likely(rx_ring->next_to_use != i)) {
2127 rx_ring->next_to_use = i;
2128 if (unlikely(i-- == 0))
2129 i = (rx_ring->count - 1);
2130
2131 /* Force memory writes to complete before letting h/w
2132 * know there are new descriptors to fetch. (Only
2133 * applicable for weak-ordered memory model archs, such
2134 * as IA-64). */
2135 wmb();
2136 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2137 }
2138 }
2139
2140 /**
2141 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2142 *
2143 * @param netdev network interface device structure
2144 * @param grp indicates to enable or disable tagging/stripping
2145 **/
2146 static void
2147 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2148 {
2149 struct ixgb_adapter *adapter = netdev_priv(netdev);
2150 u32 ctrl, rctl;
2151
2152 ixgb_irq_disable(adapter);
2153 adapter->vlgrp = grp;
2154
2155 if(grp) {
2156 /* enable VLAN tag insert/strip */
2157 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158 ctrl |= IXGB_CTRL0_VME;
2159 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160
2161 /* enable VLAN receive filtering */
2162
2163 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2164 rctl |= IXGB_RCTL_VFE;
2165 rctl &= ~IXGB_RCTL_CFIEN;
2166 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2167 } else {
2168 /* disable VLAN tag insert/strip */
2169
2170 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2171 ctrl &= ~IXGB_CTRL0_VME;
2172 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2173
2174 /* disable VLAN filtering */
2175
2176 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2177 rctl &= ~IXGB_RCTL_VFE;
2178 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2179 }
2180
2181 /* don't enable interrupts unless we are UP */
2182 if (adapter->netdev->flags & IFF_UP)
2183 ixgb_irq_enable(adapter);
2184 }
2185
2186 static void
2187 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2188 {
2189 struct ixgb_adapter *adapter = netdev_priv(netdev);
2190 u32 vfta, index;
2191
2192 /* add VID to filter table */
2193
2194 index = (vid >> 5) & 0x7F;
2195 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2196 vfta |= (1 << (vid & 0x1F));
2197 ixgb_write_vfta(&adapter->hw, index, vfta);
2198 }
2199
2200 static void
2201 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2202 {
2203 struct ixgb_adapter *adapter = netdev_priv(netdev);
2204 u32 vfta, index;
2205
2206 ixgb_irq_disable(adapter);
2207
2208 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2209
2210 /* don't enable interrupts unless we are UP */
2211 if (adapter->netdev->flags & IFF_UP)
2212 ixgb_irq_enable(adapter);
2213
2214 /* remove VID from filter table */
2215
2216 index = (vid >> 5) & 0x7F;
2217 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2218 vfta &= ~(1 << (vid & 0x1F));
2219 ixgb_write_vfta(&adapter->hw, index, vfta);
2220 }
2221
2222 static void
2223 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2224 {
2225 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2226
2227 if(adapter->vlgrp) {
2228 u16 vid;
2229 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2230 if(!vlan_group_get_device(adapter->vlgrp, vid))
2231 continue;
2232 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2233 }
2234 }
2235 }
2236
2237 #ifdef CONFIG_NET_POLL_CONTROLLER
2238 /*
2239 * Polling 'interrupt' - used by things like netconsole to send skbs
2240 * without having to re-enable interrupts. It's not called while
2241 * the interrupt routine is executing.
2242 */
2243
2244 static void ixgb_netpoll(struct net_device *dev)
2245 {
2246 struct ixgb_adapter *adapter = netdev_priv(dev);
2247
2248 disable_irq(adapter->pdev->irq);
2249 ixgb_intr(adapter->pdev->irq, dev);
2250 enable_irq(adapter->pdev->irq);
2251 }
2252 #endif
2253
2254 /**
2255 * ixgb_io_error_detected() - called when PCI error is detected
2256 * @pdev pointer to pci device with error
2257 * @state pci channel state after error
2258 *
2259 * This callback is called by the PCI subsystem whenever
2260 * a PCI bus error is detected.
2261 */
2262 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2263 enum pci_channel_state state)
2264 {
2265 struct net_device *netdev = pci_get_drvdata(pdev);
2266 struct ixgb_adapter *adapter = netdev_priv(netdev);
2267
2268 if(netif_running(netdev))
2269 ixgb_down(adapter, true);
2270
2271 pci_disable_device(pdev);
2272
2273 /* Request a slot reset. */
2274 return PCI_ERS_RESULT_NEED_RESET;
2275 }
2276
2277 /**
2278 * ixgb_io_slot_reset - called after the pci bus has been reset.
2279 * @pdev pointer to pci device with error
2280 *
2281 * This callback is called after the PCI buss has been reset.
2282 * Basically, this tries to restart the card from scratch.
2283 * This is a shortened version of the device probe/discovery code,
2284 * it resembles the first-half of the ixgb_probe() routine.
2285 */
2286 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2287 {
2288 struct net_device *netdev = pci_get_drvdata(pdev);
2289 struct ixgb_adapter *adapter = netdev_priv(netdev);
2290
2291 if(pci_enable_device(pdev)) {
2292 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2293 return PCI_ERS_RESULT_DISCONNECT;
2294 }
2295
2296 /* Perform card reset only on one instance of the card */
2297 if (0 != PCI_FUNC (pdev->devfn))
2298 return PCI_ERS_RESULT_RECOVERED;
2299
2300 pci_set_master(pdev);
2301
2302 netif_carrier_off(netdev);
2303 netif_stop_queue(netdev);
2304 ixgb_reset(adapter);
2305
2306 /* Make sure the EEPROM is good */
2307 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2308 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2309 return PCI_ERS_RESULT_DISCONNECT;
2310 }
2311 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2312 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2313
2314 if(!is_valid_ether_addr(netdev->perm_addr)) {
2315 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2316 return PCI_ERS_RESULT_DISCONNECT;
2317 }
2318
2319 return PCI_ERS_RESULT_RECOVERED;
2320 }
2321
2322 /**
2323 * ixgb_io_resume - called when its OK to resume normal operations
2324 * @pdev pointer to pci device with error
2325 *
2326 * The error recovery driver tells us that its OK to resume
2327 * normal operation. Implementation resembles the second-half
2328 * of the ixgb_probe() routine.
2329 */
2330 static void ixgb_io_resume (struct pci_dev *pdev)
2331 {
2332 struct net_device *netdev = pci_get_drvdata(pdev);
2333 struct ixgb_adapter *adapter = netdev_priv(netdev);
2334
2335 pci_set_master(pdev);
2336
2337 if(netif_running(netdev)) {
2338 if(ixgb_up(adapter)) {
2339 printk ("ixgb: can't bring device back up after reset\n");
2340 return;
2341 }
2342 }
2343
2344 netif_device_attach(netdev);
2345 mod_timer(&adapter->watchdog_timer, jiffies);
2346 }
2347
2348 /* ixgb_main.c */
Support for the Chinese Samsung S3C2440 based development boards