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pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / net / ixgb / ixgb_main.c
blobd444de58ba341455b40cf823e31736f270c01836
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-k2"DRIVERNAPI
40 char ixgb_driver_version[] = DRV_VERSION;
41 static 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, boolean_t 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 boolean_t 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 boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
102 int *work_done, int work_to_do);
103 #else
104 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
105 #endif
106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
107 void ixgb_set_ethtool_ops(struct net_device *netdev);
108 static void ixgb_tx_timeout(struct net_device *dev);
109 static void ixgb_tx_timeout_task(struct work_struct *work);
110 static void ixgb_vlan_rx_register(struct net_device *netdev,
111 struct vlan_group *grp);
112 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
113 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
114 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
115
116 #ifdef CONFIG_NET_POLL_CONTROLLER
117 /* for netdump / net console */
118 static void ixgb_netpoll(struct net_device *dev);
119 #endif
120
121 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
122 enum pci_channel_state state);
123 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
124 static void ixgb_io_resume (struct pci_dev *pdev);
125
126 /* Exported from other modules */
127 extern void ixgb_check_options(struct ixgb_adapter *adapter);
128
129 static struct pci_error_handlers ixgb_err_handler = {
130 .error_detected = ixgb_io_error_detected,
131 .slot_reset = ixgb_io_slot_reset,
132 .resume = ixgb_io_resume,
133 };
134
135 static struct pci_driver ixgb_driver = {
136 .name = ixgb_driver_name,
137 .id_table = ixgb_pci_tbl,
138 .probe = ixgb_probe,
139 .remove = __devexit_p(ixgb_remove),
140 .err_handler = &ixgb_err_handler
141 };
142
143 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
144 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
145 MODULE_LICENSE("GPL");
146 MODULE_VERSION(DRV_VERSION);
147
148 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
149 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
150 module_param(debug, int, 0);
151 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
152
153 /* some defines for controlling descriptor fetches in h/w */
154 #define RXDCTL_WTHRESH_DEFAULT 15 /* chip writes back at this many or RXT0 */
155 #define RXDCTL_PTHRESH_DEFAULT 0 /* chip considers prefech below
156 * this */
157 #define RXDCTL_HTHRESH_DEFAULT 0 /* chip will only prefetch if tail
158 * is pushed this many descriptors
159 * from head */
160
161 /**
162 * ixgb_init_module - Driver Registration Routine
163 *
164 * ixgb_init_module is the first routine called when the driver is
165 * loaded. All it does is register with the PCI subsystem.
166 **/
167
168 static int __init
169 ixgb_init_module(void)
170 {
171 printk(KERN_INFO "%s - version %s\n",
172 ixgb_driver_string, ixgb_driver_version);
173
174 printk(KERN_INFO "%s\n", ixgb_copyright);
175
176 return pci_register_driver(&ixgb_driver);
177 }
178
179 module_init(ixgb_init_module);
180
181 /**
182 * ixgb_exit_module - Driver Exit Cleanup Routine
183 *
184 * ixgb_exit_module is called just before the driver is removed
185 * from memory.
186 **/
187
188 static void __exit
189 ixgb_exit_module(void)
190 {
191 pci_unregister_driver(&ixgb_driver);
192 }
193
194 module_exit(ixgb_exit_module);
195
196 /**
197 * ixgb_irq_disable - Mask off interrupt generation on the NIC
198 * @adapter: board private structure
199 **/
200
201 static void
202 ixgb_irq_disable(struct ixgb_adapter *adapter)
203 {
204 atomic_inc(&adapter->irq_sem);
205 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
206 IXGB_WRITE_FLUSH(&adapter->hw);
207 synchronize_irq(adapter->pdev->irq);
208 }
209
210 /**
211 * ixgb_irq_enable - Enable default interrupt generation settings
212 * @adapter: board private structure
213 **/
214
215 static void
216 ixgb_irq_enable(struct ixgb_adapter *adapter)
217 {
218 if(atomic_dec_and_test(&adapter->irq_sem)) {
219 IXGB_WRITE_REG(&adapter->hw, IMS,
220 IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
221 IXGB_INT_LSC);
222 IXGB_WRITE_FLUSH(&adapter->hw);
223 }
224 }
225
226 int
227 ixgb_up(struct ixgb_adapter *adapter)
228 {
229 struct net_device *netdev = adapter->netdev;
230 int err, irq_flags = IRQF_SHARED;
231 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
232 struct ixgb_hw *hw = &adapter->hw;
233
234 /* hardware has been reset, we need to reload some things */
235
236 ixgb_rar_set(hw, netdev->dev_addr, 0);
237 ixgb_set_multi(netdev);
238
239 ixgb_restore_vlan(adapter);
240
241 ixgb_configure_tx(adapter);
242 ixgb_setup_rctl(adapter);
243 ixgb_configure_rx(adapter);
244 ixgb_alloc_rx_buffers(adapter);
245
246 /* disable interrupts and get the hardware into a known state */
247 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
248
249 /* only enable MSI if bus is in PCI-X mode */
250 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
251 err = pci_enable_msi(adapter->pdev);
252 if (!err) {
253 adapter->have_msi = 1;
254 irq_flags = 0;
255 }
256 /* proceed to try to request regular interrupt */
257 }
258
259 err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
260 netdev->name, netdev);
261 if (err) {
262 if (adapter->have_msi)
263 pci_disable_msi(adapter->pdev);
264 DPRINTK(PROBE, ERR,
265 "Unable to allocate interrupt Error: %d\n", err);
266 return err;
267 }
268
269 if((hw->max_frame_size != max_frame) ||
270 (hw->max_frame_size !=
271 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
272
273 hw->max_frame_size = max_frame;
274
275 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
276
277 if(hw->max_frame_size >
278 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
279 uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
280
281 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
282 ctrl0 |= IXGB_CTRL0_JFE;
283 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
284 }
285 }
286 }
287
288 mod_timer(&adapter->watchdog_timer, jiffies);
289
290 #ifdef CONFIG_IXGB_NAPI
291 napi_enable(&adapter->napi);
292 #endif
293 ixgb_irq_enable(adapter);
294
295 return 0;
296 }
297
298 void
299 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
300 {
301 struct net_device *netdev = adapter->netdev;
302
303 ixgb_irq_disable(adapter);
304 free_irq(adapter->pdev->irq, netdev);
305
306 if (adapter->have_msi)
307 pci_disable_msi(adapter->pdev);
308
309 if(kill_watchdog)
310 del_timer_sync(&adapter->watchdog_timer);
311 #ifdef CONFIG_IXGB_NAPI
312 napi_disable(&adapter->napi);
313 #endif
314 adapter->link_speed = 0;
315 adapter->link_duplex = 0;
316 netif_carrier_off(netdev);
317 netif_stop_queue(netdev);
318
319 ixgb_reset(adapter);
320 ixgb_clean_tx_ring(adapter);
321 ixgb_clean_rx_ring(adapter);
322 }
323
324 void
325 ixgb_reset(struct ixgb_adapter *adapter)
326 {
327
328 ixgb_adapter_stop(&adapter->hw);
329 if(!ixgb_init_hw(&adapter->hw))
330 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
331 }
332
333 /**
334 * ixgb_probe - Device Initialization Routine
335 * @pdev: PCI device information struct
336 * @ent: entry in ixgb_pci_tbl
337 *
338 * Returns 0 on success, negative on failure
339 *
340 * ixgb_probe initializes an adapter identified by a pci_dev structure.
341 * The OS initialization, configuring of the adapter private structure,
342 * and a hardware reset occur.
343 **/
344
345 static int __devinit
346 ixgb_probe(struct pci_dev *pdev,
347 const struct pci_device_id *ent)
348 {
349 struct net_device *netdev = NULL;
350 struct ixgb_adapter *adapter;
351 static int cards_found = 0;
352 unsigned long mmio_start;
353 int mmio_len;
354 int pci_using_dac;
355 int i;
356 int err;
357
358 if((err = pci_enable_device(pdev)))
359 return err;
360
361 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
362 !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
363 pci_using_dac = 1;
364 } else {
365 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
366 (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
367 printk(KERN_ERR
368 "ixgb: No usable DMA configuration, aborting\n");
369 goto err_dma_mask;
370 }
371 pci_using_dac = 0;
372 }
373
374 if((err = pci_request_regions(pdev, ixgb_driver_name)))
375 goto err_request_regions;
376
377 pci_set_master(pdev);
378
379 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
380 if(!netdev) {
381 err = -ENOMEM;
382 goto err_alloc_etherdev;
383 }
384
385 SET_NETDEV_DEV(netdev, &pdev->dev);
386
387 pci_set_drvdata(pdev, netdev);
388 adapter = netdev_priv(netdev);
389 adapter->netdev = netdev;
390 adapter->pdev = pdev;
391 adapter->hw.back = adapter;
392 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
393
394 mmio_start = pci_resource_start(pdev, BAR_0);
395 mmio_len = pci_resource_len(pdev, BAR_0);
396
397 adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
398 if(!adapter->hw.hw_addr) {
399 err = -EIO;
400 goto err_ioremap;
401 }
402
403 for(i = BAR_1; i <= BAR_5; i++) {
404 if(pci_resource_len(pdev, i) == 0)
405 continue;
406 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
407 adapter->hw.io_base = pci_resource_start(pdev, i);
408 break;
409 }
410 }
411
412 netdev->open = &ixgb_open;
413 netdev->stop = &ixgb_close;
414 netdev->hard_start_xmit = &ixgb_xmit_frame;
415 netdev->get_stats = &ixgb_get_stats;
416 netdev->set_multicast_list = &ixgb_set_multi;
417 netdev->set_mac_address = &ixgb_set_mac;
418 netdev->change_mtu = &ixgb_change_mtu;
419 ixgb_set_ethtool_ops(netdev);
420 netdev->tx_timeout = &ixgb_tx_timeout;
421 netdev->watchdog_timeo = 5 * HZ;
422 #ifdef CONFIG_IXGB_NAPI
423 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
424 #endif
425 netdev->vlan_rx_register = ixgb_vlan_rx_register;
426 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
427 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
428 #ifdef CONFIG_NET_POLL_CONTROLLER
429 netdev->poll_controller = ixgb_netpoll;
430 #endif
431
432 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
433 netdev->mem_start = mmio_start;
434 netdev->mem_end = mmio_start + mmio_len;
435 netdev->base_addr = adapter->hw.io_base;
436
437 adapter->bd_number = cards_found;
438 adapter->link_speed = 0;
439 adapter->link_duplex = 0;
440
441 /* setup the private structure */
442
443 if((err = ixgb_sw_init(adapter)))
444 goto err_sw_init;
445
446 netdev->features = NETIF_F_SG |
447 NETIF_F_HW_CSUM |
448 NETIF_F_HW_VLAN_TX |
449 NETIF_F_HW_VLAN_RX |
450 NETIF_F_HW_VLAN_FILTER;
451 netdev->features |= NETIF_F_TSO;
452 #ifdef NETIF_F_LLTX
453 netdev->features |= NETIF_F_LLTX;
454 #endif
455
456 if(pci_using_dac)
457 netdev->features |= NETIF_F_HIGHDMA;
458
459 /* make sure the EEPROM is good */
460
461 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
462 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
463 err = -EIO;
464 goto err_eeprom;
465 }
466
467 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
468 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
469
470 if(!is_valid_ether_addr(netdev->perm_addr)) {
471 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
472 err = -EIO;
473 goto err_eeprom;
474 }
475
476 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
477
478 init_timer(&adapter->watchdog_timer);
479 adapter->watchdog_timer.function = &ixgb_watchdog;
480 adapter->watchdog_timer.data = (unsigned long)adapter;
481
482 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
483
484 strcpy(netdev->name, "eth%d");
485 if((err = register_netdev(netdev)))
486 goto err_register;
487
488 /* we're going to reset, so assume we have no link for now */
489
490 netif_carrier_off(netdev);
491 netif_stop_queue(netdev);
492
493 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
494 ixgb_check_options(adapter);
495 /* reset the hardware with the new settings */
496
497 ixgb_reset(adapter);
498
499 cards_found++;
500 return 0;
501
502 err_register:
503 err_sw_init:
504 err_eeprom:
505 iounmap(adapter->hw.hw_addr);
506 err_ioremap:
507 free_netdev(netdev);
508 err_alloc_etherdev:
509 pci_release_regions(pdev);
510 err_request_regions:
511 err_dma_mask:
512 pci_disable_device(pdev);
513 return err;
514 }
515
516 /**
517 * ixgb_remove - Device Removal Routine
518 * @pdev: PCI device information struct
519 *
520 * ixgb_remove is called by the PCI subsystem to alert the driver
521 * that it should release a PCI device. The could be caused by a
522 * Hot-Plug event, or because the driver is going to be removed from
523 * memory.
524 **/
525
526 static void __devexit
527 ixgb_remove(struct pci_dev *pdev)
528 {
529 struct net_device *netdev = pci_get_drvdata(pdev);
530 struct ixgb_adapter *adapter = netdev_priv(netdev);
531
532 unregister_netdev(netdev);
533
534 iounmap(adapter->hw.hw_addr);
535 pci_release_regions(pdev);
536
537 free_netdev(netdev);
538 }
539
540 /**
541 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
542 * @adapter: board private structure to initialize
543 *
544 * ixgb_sw_init initializes the Adapter private data structure.
545 * Fields are initialized based on PCI device information and
546 * OS network device settings (MTU size).
547 **/
548
549 static int __devinit
550 ixgb_sw_init(struct ixgb_adapter *adapter)
551 {
552 struct ixgb_hw *hw = &adapter->hw;
553 struct net_device *netdev = adapter->netdev;
554 struct pci_dev *pdev = adapter->pdev;
555
556 /* PCI config space info */
557
558 hw->vendor_id = pdev->vendor;
559 hw->device_id = pdev->device;
560 hw->subsystem_vendor_id = pdev->subsystem_vendor;
561 hw->subsystem_id = pdev->subsystem_device;
562
563 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
564 adapter->rx_buffer_len = hw->max_frame_size;
565
566 if((hw->device_id == IXGB_DEVICE_ID_82597EX)
567 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
568 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
569 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
570 hw->mac_type = ixgb_82597;
571 else {
572 /* should never have loaded on this device */
573 DPRINTK(PROBE, ERR, "unsupported device id\n");
574 }
575
576 /* enable flow control to be programmed */
577 hw->fc.send_xon = 1;
578
579 atomic_set(&adapter->irq_sem, 1);
580 spin_lock_init(&adapter->tx_lock);
581
582 return 0;
583 }
584
585 /**
586 * ixgb_open - Called when a network interface is made active
587 * @netdev: network interface device structure
588 *
589 * Returns 0 on success, negative value on failure
590 *
591 * The open entry point is called when a network interface is made
592 * active by the system (IFF_UP). At this point all resources needed
593 * for transmit and receive operations are allocated, the interrupt
594 * handler is registered with the OS, the watchdog timer is started,
595 * and the stack is notified that the interface is ready.
596 **/
597
598 static int
599 ixgb_open(struct net_device *netdev)
600 {
601 struct ixgb_adapter *adapter = netdev_priv(netdev);
602 int err;
603
604 /* allocate transmit descriptors */
605
606 if((err = ixgb_setup_tx_resources(adapter)))
607 goto err_setup_tx;
608
609 /* allocate receive descriptors */
610
611 if((err = ixgb_setup_rx_resources(adapter)))
612 goto err_setup_rx;
613
614 if((err = ixgb_up(adapter)))
615 goto err_up;
616
617 return 0;
618
619 err_up:
620 ixgb_free_rx_resources(adapter);
621 err_setup_rx:
622 ixgb_free_tx_resources(adapter);
623 err_setup_tx:
624 ixgb_reset(adapter);
625
626 return err;
627 }
628
629 /**
630 * ixgb_close - Disables a network interface
631 * @netdev: network interface device structure
632 *
633 * Returns 0, this is not allowed to fail
634 *
635 * The close entry point is called when an interface is de-activated
636 * by the OS. The hardware is still under the drivers control, but
637 * needs to be disabled. A global MAC reset is issued to stop the
638 * hardware, and all transmit and receive resources are freed.
639 **/
640
641 static int
642 ixgb_close(struct net_device *netdev)
643 {
644 struct ixgb_adapter *adapter = netdev_priv(netdev);
645
646 ixgb_down(adapter, TRUE);
647
648 ixgb_free_tx_resources(adapter);
649 ixgb_free_rx_resources(adapter);
650
651 return 0;
652 }
653
654 /**
655 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
656 * @adapter: board private structure
657 *
658 * Return 0 on success, negative on failure
659 **/
660
661 int
662 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
663 {
664 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
665 struct pci_dev *pdev = adapter->pdev;
666 int size;
667
668 size = sizeof(struct ixgb_buffer) * txdr->count;
669 txdr->buffer_info = vmalloc(size);
670 if(!txdr->buffer_info) {
671 DPRINTK(PROBE, ERR,
672 "Unable to allocate transmit descriptor ring memory\n");
673 return -ENOMEM;
674 }
675 memset(txdr->buffer_info, 0, size);
676
677 /* round up to nearest 4K */
678
679 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
680 txdr->size = ALIGN(txdr->size, 4096);
681
682 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
683 if(!txdr->desc) {
684 vfree(txdr->buffer_info);
685 DPRINTK(PROBE, ERR,
686 "Unable to allocate transmit descriptor memory\n");
687 return -ENOMEM;
688 }
689 memset(txdr->desc, 0, txdr->size);
690
691 txdr->next_to_use = 0;
692 txdr->next_to_clean = 0;
693
694 return 0;
695 }
696
697 /**
698 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
699 * @adapter: board private structure
700 *
701 * Configure the Tx unit of the MAC after a reset.
702 **/
703
704 static void
705 ixgb_configure_tx(struct ixgb_adapter *adapter)
706 {
707 uint64_t tdba = adapter->tx_ring.dma;
708 uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
709 uint32_t tctl;
710 struct ixgb_hw *hw = &adapter->hw;
711
712 /* Setup the Base and Length of the Tx Descriptor Ring
713 * tx_ring.dma can be either a 32 or 64 bit value
714 */
715
716 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
717 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
718
719 IXGB_WRITE_REG(hw, TDLEN, tdlen);
720
721 /* Setup the HW Tx Head and Tail descriptor pointers */
722
723 IXGB_WRITE_REG(hw, TDH, 0);
724 IXGB_WRITE_REG(hw, TDT, 0);
725
726 /* don't set up txdctl, it induces performance problems if configured
727 * incorrectly */
728 /* Set the Tx Interrupt Delay register */
729
730 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
731
732 /* Program the Transmit Control Register */
733
734 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
735 IXGB_WRITE_REG(hw, TCTL, tctl);
736
737 /* Setup Transmit Descriptor Settings for this adapter */
738 adapter->tx_cmd_type =
739 IXGB_TX_DESC_TYPE
740 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
741 }
742
743 /**
744 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
745 * @adapter: board private structure
746 *
747 * Returns 0 on success, negative on failure
748 **/
749
750 int
751 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
752 {
753 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
754 struct pci_dev *pdev = adapter->pdev;
755 int size;
756
757 size = sizeof(struct ixgb_buffer) * rxdr->count;
758 rxdr->buffer_info = vmalloc(size);
759 if(!rxdr->buffer_info) {
760 DPRINTK(PROBE, ERR,
761 "Unable to allocate receive descriptor ring\n");
762 return -ENOMEM;
763 }
764 memset(rxdr->buffer_info, 0, size);
765
766 /* Round up to nearest 4K */
767
768 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
769 rxdr->size = ALIGN(rxdr->size, 4096);
770
771 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
772
773 if(!rxdr->desc) {
774 vfree(rxdr->buffer_info);
775 DPRINTK(PROBE, ERR,
776 "Unable to allocate receive descriptors\n");
777 return -ENOMEM;
778 }
779 memset(rxdr->desc, 0, rxdr->size);
780
781 rxdr->next_to_clean = 0;
782 rxdr->next_to_use = 0;
783
784 return 0;
785 }
786
787 /**
788 * ixgb_setup_rctl - configure the receive control register
789 * @adapter: Board private structure
790 **/
791
792 static void
793 ixgb_setup_rctl(struct ixgb_adapter *adapter)
794 {
795 uint32_t rctl;
796
797 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
798
799 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
800
801 rctl |=
802 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
803 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
804 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
805
806 rctl |= IXGB_RCTL_SECRC;
807
808 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
809 rctl |= IXGB_RCTL_BSIZE_2048;
810 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
811 rctl |= IXGB_RCTL_BSIZE_4096;
812 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
813 rctl |= IXGB_RCTL_BSIZE_8192;
814 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
815 rctl |= IXGB_RCTL_BSIZE_16384;
816
817 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
818 }
819
820 /**
821 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
822 * @adapter: board private structure
823 *
824 * Configure the Rx unit of the MAC after a reset.
825 **/
826
827 static void
828 ixgb_configure_rx(struct ixgb_adapter *adapter)
829 {
830 uint64_t rdba = adapter->rx_ring.dma;
831 uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
832 struct ixgb_hw *hw = &adapter->hw;
833 uint32_t rctl;
834 uint32_t rxcsum;
835 uint32_t rxdctl;
836
837 /* make sure receives are disabled while setting up the descriptors */
838
839 rctl = IXGB_READ_REG(hw, RCTL);
840 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
841
842 /* set the Receive Delay Timer Register */
843
844 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
845
846 /* Setup the Base and Length of the Rx Descriptor Ring */
847
848 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
849 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
850
851 IXGB_WRITE_REG(hw, RDLEN, rdlen);
852
853 /* Setup the HW Rx Head and Tail Descriptor Pointers */
854 IXGB_WRITE_REG(hw, RDH, 0);
855 IXGB_WRITE_REG(hw, RDT, 0);
856
857 /* set up pre-fetching of receive buffers so we get some before we
858 * run out (default hardware behavior is to run out before fetching
859 * more). This sets up to fetch if HTHRESH rx descriptors are avail
860 * and the descriptors in hw cache are below PTHRESH. This avoids
861 * the hardware behavior of fetching <=512 descriptors in a single
862 * burst that pre-empts all other activity, usually causing fifo
863 * overflows. */
864 /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
865 rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
866 RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
867 RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
868 IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
869
870 /* Enable Receive Checksum Offload for TCP and UDP */
871 if(adapter->rx_csum == TRUE) {
872 rxcsum = IXGB_READ_REG(hw, RXCSUM);
873 rxcsum |= IXGB_RXCSUM_TUOFL;
874 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
875 }
876
877 /* Enable Receives */
878
879 IXGB_WRITE_REG(hw, RCTL, rctl);
880 }
881
882 /**
883 * ixgb_free_tx_resources - Free Tx Resources
884 * @adapter: board private structure
885 *
886 * Free all transmit software resources
887 **/
888
889 void
890 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
891 {
892 struct pci_dev *pdev = adapter->pdev;
893
894 ixgb_clean_tx_ring(adapter);
895
896 vfree(adapter->tx_ring.buffer_info);
897 adapter->tx_ring.buffer_info = NULL;
898
899 pci_free_consistent(pdev, adapter->tx_ring.size,
900 adapter->tx_ring.desc, adapter->tx_ring.dma);
901
902 adapter->tx_ring.desc = NULL;
903 }
904
905 static void
906 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
907 struct ixgb_buffer *buffer_info)
908 {
909 struct pci_dev *pdev = adapter->pdev;
910
911 if (buffer_info->dma)
912 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
913 PCI_DMA_TODEVICE);
914
915 if (buffer_info->skb)
916 dev_kfree_skb_any(buffer_info->skb);
917
918 buffer_info->skb = NULL;
919 buffer_info->dma = 0;
920 buffer_info->time_stamp = 0;
921 /* these fields must always be initialized in tx
922 * buffer_info->length = 0;
923 * buffer_info->next_to_watch = 0; */
924 }
925
926 /**
927 * ixgb_clean_tx_ring - Free Tx Buffers
928 * @adapter: board private structure
929 **/
930
931 static void
932 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
933 {
934 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
935 struct ixgb_buffer *buffer_info;
936 unsigned long size;
937 unsigned int i;
938
939 /* Free all the Tx ring sk_buffs */
940
941 for(i = 0; i < tx_ring->count; i++) {
942 buffer_info = &tx_ring->buffer_info[i];
943 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
944 }
945
946 size = sizeof(struct ixgb_buffer) * tx_ring->count;
947 memset(tx_ring->buffer_info, 0, size);
948
949 /* Zero out the descriptor ring */
950
951 memset(tx_ring->desc, 0, tx_ring->size);
952
953 tx_ring->next_to_use = 0;
954 tx_ring->next_to_clean = 0;
955
956 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
957 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
958 }
959
960 /**
961 * ixgb_free_rx_resources - Free Rx Resources
962 * @adapter: board private structure
963 *
964 * Free all receive software resources
965 **/
966
967 void
968 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
969 {
970 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
971 struct pci_dev *pdev = adapter->pdev;
972
973 ixgb_clean_rx_ring(adapter);
974
975 vfree(rx_ring->buffer_info);
976 rx_ring->buffer_info = NULL;
977
978 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
979
980 rx_ring->desc = NULL;
981 }
982
983 /**
984 * ixgb_clean_rx_ring - Free Rx Buffers
985 * @adapter: board private structure
986 **/
987
988 static void
989 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
990 {
991 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
992 struct ixgb_buffer *buffer_info;
993 struct pci_dev *pdev = adapter->pdev;
994 unsigned long size;
995 unsigned int i;
996
997 /* Free all the Rx ring sk_buffs */
998
999 for(i = 0; i < rx_ring->count; i++) {
1000 buffer_info = &rx_ring->buffer_info[i];
1001 if(buffer_info->skb) {
1002
1003 pci_unmap_single(pdev,
1004 buffer_info->dma,
1005 buffer_info->length,
1006 PCI_DMA_FROMDEVICE);
1007
1008 dev_kfree_skb(buffer_info->skb);
1009
1010 buffer_info->skb = NULL;
1011 }
1012 }
1013
1014 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1015 memset(rx_ring->buffer_info, 0, size);
1016
1017 /* Zero out the descriptor ring */
1018
1019 memset(rx_ring->desc, 0, rx_ring->size);
1020
1021 rx_ring->next_to_clean = 0;
1022 rx_ring->next_to_use = 0;
1023
1024 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1025 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1026 }
1027
1028 /**
1029 * ixgb_set_mac - Change the Ethernet Address of the NIC
1030 * @netdev: network interface device structure
1031 * @p: pointer to an address structure
1032 *
1033 * Returns 0 on success, negative on failure
1034 **/
1035
1036 static int
1037 ixgb_set_mac(struct net_device *netdev, void *p)
1038 {
1039 struct ixgb_adapter *adapter = netdev_priv(netdev);
1040 struct sockaddr *addr = p;
1041
1042 if(!is_valid_ether_addr(addr->sa_data))
1043 return -EADDRNOTAVAIL;
1044
1045 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1046
1047 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1048
1049 return 0;
1050 }
1051
1052 /**
1053 * ixgb_set_multi - Multicast and Promiscuous mode set
1054 * @netdev: network interface device structure
1055 *
1056 * The set_multi entry point is called whenever the multicast address
1057 * list or the network interface flags are updated. This routine is
1058 * responsible for configuring the hardware for proper multicast,
1059 * promiscuous mode, and all-multi behavior.
1060 **/
1061
1062 static void
1063 ixgb_set_multi(struct net_device *netdev)
1064 {
1065 struct ixgb_adapter *adapter = netdev_priv(netdev);
1066 struct ixgb_hw *hw = &adapter->hw;
1067 struct dev_mc_list *mc_ptr;
1068 uint32_t rctl;
1069 int i;
1070
1071 /* Check for Promiscuous and All Multicast modes */
1072
1073 rctl = IXGB_READ_REG(hw, RCTL);
1074
1075 if(netdev->flags & IFF_PROMISC) {
1076 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077 } else if(netdev->flags & IFF_ALLMULTI) {
1078 rctl |= IXGB_RCTL_MPE;
1079 rctl &= ~IXGB_RCTL_UPE;
1080 } else {
1081 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1082 }
1083
1084 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1085 rctl |= IXGB_RCTL_MPE;
1086 IXGB_WRITE_REG(hw, RCTL, rctl);
1087 } else {
1088 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1089
1090 IXGB_WRITE_REG(hw, RCTL, rctl);
1091
1092 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1093 i++, mc_ptr = mc_ptr->next)
1094 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1095 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1096
1097 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1098 }
1099 }
1100
1101 /**
1102 * ixgb_watchdog - Timer Call-back
1103 * @data: pointer to netdev cast into an unsigned long
1104 **/
1105
1106 static void
1107 ixgb_watchdog(unsigned long data)
1108 {
1109 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1110 struct net_device *netdev = adapter->netdev;
1111 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1112
1113 ixgb_check_for_link(&adapter->hw);
1114
1115 if (ixgb_check_for_bad_link(&adapter->hw)) {
1116 /* force the reset path */
1117 netif_stop_queue(netdev);
1118 }
1119
1120 if(adapter->hw.link_up) {
1121 if(!netif_carrier_ok(netdev)) {
1122 DPRINTK(LINK, INFO,
1123 "NIC Link is Up 10000 Mbps Full Duplex\n");
1124 adapter->link_speed = 10000;
1125 adapter->link_duplex = FULL_DUPLEX;
1126 netif_carrier_on(netdev);
1127 netif_wake_queue(netdev);
1128 }
1129 } else {
1130 if(netif_carrier_ok(netdev)) {
1131 adapter->link_speed = 0;
1132 adapter->link_duplex = 0;
1133 DPRINTK(LINK, INFO, "NIC Link is Down\n");
1134 netif_carrier_off(netdev);
1135 netif_stop_queue(netdev);
1136
1137 }
1138 }
1139
1140 ixgb_update_stats(adapter);
1141
1142 if(!netif_carrier_ok(netdev)) {
1143 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1144 /* We've lost link, so the controller stops DMA,
1145 * but we've got queued Tx work that's never going
1146 * to get done, so reset controller to flush Tx.
1147 * (Do the reset outside of interrupt context). */
1148 schedule_work(&adapter->tx_timeout_task);
1149 }
1150 }
1151
1152 /* Force detection of hung controller every watchdog period */
1153 adapter->detect_tx_hung = TRUE;
1154
1155 /* generate an interrupt to force clean up of any stragglers */
1156 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1157
1158 /* Reset the timer */
1159 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1160 }
1161
1162 #define IXGB_TX_FLAGS_CSUM 0x00000001
1163 #define IXGB_TX_FLAGS_VLAN 0x00000002
1164 #define IXGB_TX_FLAGS_TSO 0x00000004
1165
1166 static int
1167 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1168 {
1169 struct ixgb_context_desc *context_desc;
1170 unsigned int i;
1171 uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1172 uint16_t ipcse, tucse, mss;
1173 int err;
1174
1175 if (likely(skb_is_gso(skb))) {
1176 struct ixgb_buffer *buffer_info;
1177 struct iphdr *iph;
1178
1179 if (skb_header_cloned(skb)) {
1180 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1181 if (err)
1182 return err;
1183 }
1184
1185 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1186 mss = skb_shinfo(skb)->gso_size;
1187 iph = ip_hdr(skb);
1188 iph->tot_len = 0;
1189 iph->check = 0;
1190 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1191 iph->daddr, 0,
1192 IPPROTO_TCP, 0);
1193 ipcss = skb_network_offset(skb);
1194 ipcso = (void *)&(iph->check) - (void *)skb->data;
1195 ipcse = skb_transport_offset(skb) - 1;
1196 tucss = skb_transport_offset(skb);
1197 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1198 tucse = 0;
1199
1200 i = adapter->tx_ring.next_to_use;
1201 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1202 buffer_info = &adapter->tx_ring.buffer_info[i];
1203 WARN_ON(buffer_info->dma != 0);
1204
1205 context_desc->ipcss = ipcss;
1206 context_desc->ipcso = ipcso;
1207 context_desc->ipcse = cpu_to_le16(ipcse);
1208 context_desc->tucss = tucss;
1209 context_desc->tucso = tucso;
1210 context_desc->tucse = cpu_to_le16(tucse);
1211 context_desc->mss = cpu_to_le16(mss);
1212 context_desc->hdr_len = hdr_len;
1213 context_desc->status = 0;
1214 context_desc->cmd_type_len = cpu_to_le32(
1215 IXGB_CONTEXT_DESC_TYPE
1216 | IXGB_CONTEXT_DESC_CMD_TSE
1217 | IXGB_CONTEXT_DESC_CMD_IP
1218 | IXGB_CONTEXT_DESC_CMD_TCP
1219 | IXGB_CONTEXT_DESC_CMD_IDE
1220 | (skb->len - (hdr_len)));
1221
1222
1223 if(++i == adapter->tx_ring.count) i = 0;
1224 adapter->tx_ring.next_to_use = i;
1225
1226 return 1;
1227 }
1228
1229 return 0;
1230 }
1231
1232 static boolean_t
1233 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1234 {
1235 struct ixgb_context_desc *context_desc;
1236 unsigned int i;
1237 uint8_t css, cso;
1238
1239 if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1240 struct ixgb_buffer *buffer_info;
1241 css = skb_transport_offset(skb);
1242 cso = css + skb->csum_offset;
1243
1244 i = adapter->tx_ring.next_to_use;
1245 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1246 buffer_info = &adapter->tx_ring.buffer_info[i];
1247 WARN_ON(buffer_info->dma != 0);
1248
1249 context_desc->tucss = css;
1250 context_desc->tucso = cso;
1251 context_desc->tucse = 0;
1252 /* zero out any previously existing data in one instruction */
1253 *(uint32_t *)&(context_desc->ipcss) = 0;
1254 context_desc->status = 0;
1255 context_desc->hdr_len = 0;
1256 context_desc->mss = 0;
1257 context_desc->cmd_type_len =
1258 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1259 | IXGB_TX_DESC_CMD_IDE);
1260
1261 if(++i == adapter->tx_ring.count) i = 0;
1262 adapter->tx_ring.next_to_use = i;
1263
1264 return TRUE;
1265 }
1266
1267 return FALSE;
1268 }
1269
1270 #define IXGB_MAX_TXD_PWR 14
1271 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1272
1273 static int
1274 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1275 unsigned int first)
1276 {
1277 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1278 struct ixgb_buffer *buffer_info;
1279 int len = skb->len;
1280 unsigned int offset = 0, size, count = 0, i;
1281 unsigned int mss = skb_shinfo(skb)->gso_size;
1282
1283 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1284 unsigned int f;
1285
1286 len -= skb->data_len;
1287
1288 i = tx_ring->next_to_use;
1289
1290 while(len) {
1291 buffer_info = &tx_ring->buffer_info[i];
1292 size = min(len, IXGB_MAX_DATA_PER_TXD);
1293 /* Workaround for premature desc write-backs
1294 * in TSO mode. Append 4-byte sentinel desc */
1295 if (unlikely(mss && !nr_frags && size == len && size > 8))
1296 size -= 4;
1297
1298 buffer_info->length = size;
1299 WARN_ON(buffer_info->dma != 0);
1300 buffer_info->dma =
1301 pci_map_single(adapter->pdev,
1302 skb->data + offset,
1303 size,
1304 PCI_DMA_TODEVICE);
1305 buffer_info->time_stamp = jiffies;
1306 buffer_info->next_to_watch = 0;
1307
1308 len -= size;
1309 offset += size;
1310 count++;
1311 if(++i == tx_ring->count) i = 0;
1312 }
1313
1314 for(f = 0; f < nr_frags; f++) {
1315 struct skb_frag_struct *frag;
1316
1317 frag = &skb_shinfo(skb)->frags[f];
1318 len = frag->size;
1319 offset = 0;
1320
1321 while(len) {
1322 buffer_info = &tx_ring->buffer_info[i];
1323 size = min(len, IXGB_MAX_DATA_PER_TXD);
1324
1325 /* Workaround for premature desc write-backs
1326 * in TSO mode. Append 4-byte sentinel desc */
1327 if (unlikely(mss && !nr_frags && size == len
1328 && size > 8))
1329 size -= 4;
1330
1331 buffer_info->length = size;
1332 buffer_info->dma =
1333 pci_map_page(adapter->pdev,
1334 frag->page,
1335 frag->page_offset + offset,
1336 size,
1337 PCI_DMA_TODEVICE);
1338 buffer_info->time_stamp = jiffies;
1339 buffer_info->next_to_watch = 0;
1340
1341 len -= size;
1342 offset += size;
1343 count++;
1344 if(++i == tx_ring->count) i = 0;
1345 }
1346 }
1347 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1348 tx_ring->buffer_info[i].skb = skb;
1349 tx_ring->buffer_info[first].next_to_watch = i;
1350
1351 return count;
1352 }
1353
1354 static void
1355 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1356 {
1357 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1358 struct ixgb_tx_desc *tx_desc = NULL;
1359 struct ixgb_buffer *buffer_info;
1360 uint32_t cmd_type_len = adapter->tx_cmd_type;
1361 uint8_t status = 0;
1362 uint8_t popts = 0;
1363 unsigned int i;
1364
1365 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1366 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1367 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1368 }
1369
1370 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1371 popts |= IXGB_TX_DESC_POPTS_TXSM;
1372
1373 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1374 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1375 }
1376
1377 i = tx_ring->next_to_use;
1378
1379 while(count--) {
1380 buffer_info = &tx_ring->buffer_info[i];
1381 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1382 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1383 tx_desc->cmd_type_len =
1384 cpu_to_le32(cmd_type_len | buffer_info->length);
1385 tx_desc->status = status;
1386 tx_desc->popts = popts;
1387 tx_desc->vlan = cpu_to_le16(vlan_id);
1388
1389 if(++i == tx_ring->count) i = 0;
1390 }
1391
1392 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1393 | IXGB_TX_DESC_CMD_RS );
1394
1395 /* Force memory writes to complete before letting h/w
1396 * know there are new descriptors to fetch. (Only
1397 * applicable for weak-ordered memory model archs,
1398 * such as IA-64). */
1399 wmb();
1400
1401 tx_ring->next_to_use = i;
1402 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1403 }
1404
1405 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1406 {
1407 struct ixgb_adapter *adapter = netdev_priv(netdev);
1408 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1409
1410 netif_stop_queue(netdev);
1411 /* Herbert's original patch had:
1412 * smp_mb__after_netif_stop_queue();
1413 * but since that doesn't exist yet, just open code it. */
1414 smp_mb();
1415
1416 /* We need to check again in a case another CPU has just
1417 * made room available. */
1418 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1419 return -EBUSY;
1420
1421 /* A reprieve! */
1422 netif_start_queue(netdev);
1423 ++adapter->restart_queue;
1424 return 0;
1425 }
1426
1427 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1428 struct ixgb_desc_ring *tx_ring, int size)
1429 {
1430 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1431 return 0;
1432 return __ixgb_maybe_stop_tx(netdev, size);
1433 }
1434
1435
1436 /* Tx Descriptors needed, worst case */
1437 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1438 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1439 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1440 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1441 + 1 /* one more needed for sentinel TSO workaround */
1442
1443 static int
1444 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1445 {
1446 struct ixgb_adapter *adapter = netdev_priv(netdev);
1447 unsigned int first;
1448 unsigned int tx_flags = 0;
1449 unsigned long flags;
1450 int vlan_id = 0;
1451 int tso;
1452
1453 if(skb->len <= 0) {
1454 dev_kfree_skb_any(skb);
1455 return 0;
1456 }
1457
1458 #ifdef NETIF_F_LLTX
1459 local_irq_save(flags);
1460 if (!spin_trylock(&adapter->tx_lock)) {
1461 /* Collision - tell upper layer to requeue */
1462 local_irq_restore(flags);
1463 return NETDEV_TX_LOCKED;
1464 }
1465 #else
1466 spin_lock_irqsave(&adapter->tx_lock, flags);
1467 #endif
1468
1469 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1470 DESC_NEEDED))) {
1471 netif_stop_queue(netdev);
1472 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1473 return NETDEV_TX_BUSY;
1474 }
1475
1476 #ifndef NETIF_F_LLTX
1477 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1478 #endif
1479
1480 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1481 tx_flags |= IXGB_TX_FLAGS_VLAN;
1482 vlan_id = vlan_tx_tag_get(skb);
1483 }
1484
1485 first = adapter->tx_ring.next_to_use;
1486
1487 tso = ixgb_tso(adapter, skb);
1488 if (tso < 0) {
1489 dev_kfree_skb_any(skb);
1490 #ifdef NETIF_F_LLTX
1491 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1492 #endif
1493 return NETDEV_TX_OK;
1494 }
1495
1496 if (likely(tso))
1497 tx_flags |= IXGB_TX_FLAGS_TSO;
1498 else if(ixgb_tx_csum(adapter, skb))
1499 tx_flags |= IXGB_TX_FLAGS_CSUM;
1500
1501 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1502 tx_flags);
1503
1504 netdev->trans_start = jiffies;
1505
1506 #ifdef NETIF_F_LLTX
1507 /* Make sure there is space in the ring for the next send. */
1508 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1509
1510 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1511
1512 #endif
1513 return NETDEV_TX_OK;
1514 }
1515
1516 /**
1517 * ixgb_tx_timeout - Respond to a Tx Hang
1518 * @netdev: network interface device structure
1519 **/
1520
1521 static void
1522 ixgb_tx_timeout(struct net_device *netdev)
1523 {
1524 struct ixgb_adapter *adapter = netdev_priv(netdev);
1525
1526 /* Do the reset outside of interrupt context */
1527 schedule_work(&adapter->tx_timeout_task);
1528 }
1529
1530 static void
1531 ixgb_tx_timeout_task(struct work_struct *work)
1532 {
1533 struct ixgb_adapter *adapter =
1534 container_of(work, struct ixgb_adapter, tx_timeout_task);
1535
1536 adapter->tx_timeout_count++;
1537 ixgb_down(adapter, TRUE);
1538 ixgb_up(adapter);
1539 }
1540
1541 /**
1542 * ixgb_get_stats - Get System Network Statistics
1543 * @netdev: network interface device structure
1544 *
1545 * Returns the address of the device statistics structure.
1546 * The statistics are actually updated from the timer callback.
1547 **/
1548
1549 static struct net_device_stats *
1550 ixgb_get_stats(struct net_device *netdev)
1551 {
1552 struct ixgb_adapter *adapter = netdev_priv(netdev);
1553
1554 return &adapter->net_stats;
1555 }
1556
1557 /**
1558 * ixgb_change_mtu - Change the Maximum Transfer Unit
1559 * @netdev: network interface device structure
1560 * @new_mtu: new value for maximum frame size
1561 *
1562 * Returns 0 on success, negative on failure
1563 **/
1564
1565 static int
1566 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1567 {
1568 struct ixgb_adapter *adapter = netdev_priv(netdev);
1569 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1570 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1571
1572
1573 if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1574 || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1575 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1576 return -EINVAL;
1577 }
1578
1579 adapter->rx_buffer_len = max_frame;
1580
1581 netdev->mtu = new_mtu;
1582
1583 if ((old_max_frame != max_frame) && netif_running(netdev)) {
1584 ixgb_down(adapter, TRUE);
1585 ixgb_up(adapter);
1586 }
1587
1588 return 0;
1589 }
1590
1591 /**
1592 * ixgb_update_stats - Update the board statistics counters.
1593 * @adapter: board private structure
1594 **/
1595
1596 void
1597 ixgb_update_stats(struct ixgb_adapter *adapter)
1598 {
1599 struct net_device *netdev = adapter->netdev;
1600 struct pci_dev *pdev = adapter->pdev;
1601
1602 /* Prevent stats update while adapter is being reset */
1603 if (pci_channel_offline(pdev))
1604 return;
1605
1606 if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1607 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1608 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1609 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1610 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1611 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1612
1613 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1614 /* fix up multicast stats by removing broadcasts */
1615 if(multi >= bcast)
1616 multi -= bcast;
1617
1618 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1619 adapter->stats.mprch += (multi >> 32);
1620 adapter->stats.bprcl += bcast_l;
1621 adapter->stats.bprch += bcast_h;
1622 } else {
1623 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1624 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1625 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1626 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1627 }
1628 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1629 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1630 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1631 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1632 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1633 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1634 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1635 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1636 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1637 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1638 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1639 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1640 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1641 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1642 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1643 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1644 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1645 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1646 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1647 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1648 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1649 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1650 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1651 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1652 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1653 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1654 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1655 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1656 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1657 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1658 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1659 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1660 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1661 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1662 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1663 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1664 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1665 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1666 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1667 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1668 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1669 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1670 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1671 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1672 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1673 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1674 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1675 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1676 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1677 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1678 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1679 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1680 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1681 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1682 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1683 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1684
1685 /* Fill out the OS statistics structure */
1686
1687 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1688 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1689 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1690 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1691 adapter->net_stats.multicast = adapter->stats.mprcl;
1692 adapter->net_stats.collisions = 0;
1693
1694 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1695 * with a length in the type/len field */
1696 adapter->net_stats.rx_errors =
1697 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1698 adapter->stats.ruc +
1699 adapter->stats.roc /*+ adapter->stats.rlec */ +
1700 adapter->stats.icbc +
1701 adapter->stats.ecbc + adapter->stats.mpc;
1702
1703 /* see above
1704 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1705 */
1706
1707 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1708 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1709 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1710 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1711
1712 adapter->net_stats.tx_errors = 0;
1713 adapter->net_stats.rx_frame_errors = 0;
1714 adapter->net_stats.tx_aborted_errors = 0;
1715 adapter->net_stats.tx_carrier_errors = 0;
1716 adapter->net_stats.tx_fifo_errors = 0;
1717 adapter->net_stats.tx_heartbeat_errors = 0;
1718 adapter->net_stats.tx_window_errors = 0;
1719 }
1720
1721 #define IXGB_MAX_INTR 10
1722 /**
1723 * ixgb_intr - Interrupt Handler
1724 * @irq: interrupt number
1725 * @data: pointer to a network interface device structure
1726 **/
1727
1728 static irqreturn_t
1729 ixgb_intr(int irq, void *data)
1730 {
1731 struct net_device *netdev = data;
1732 struct ixgb_adapter *adapter = netdev_priv(netdev);
1733 struct ixgb_hw *hw = &adapter->hw;
1734 uint32_t icr = IXGB_READ_REG(hw, ICR);
1735 #ifndef CONFIG_IXGB_NAPI
1736 unsigned int i;
1737 #endif
1738
1739 if(unlikely(!icr))
1740 return IRQ_NONE; /* Not our interrupt */
1741
1742 if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1743 mod_timer(&adapter->watchdog_timer, jiffies);
1744 }
1745
1746 #ifdef CONFIG_IXGB_NAPI
1747 if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1748
1749 /* Disable interrupts and register for poll. The flush
1750 of the posted write is intentionally left out.
1751 */
1752
1753 atomic_inc(&adapter->irq_sem);
1754 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1755 __netif_rx_schedule(netdev, &adapter->napi);
1756 }
1757 #else
1758 /* yes, that is actually a & and it is meant to make sure that
1759 * every pass through this for loop checks both receive and
1760 * transmit queues for completed descriptors, intended to
1761 * avoid starvation issues and assist tx/rx fairness. */
1762 for(i = 0; i < IXGB_MAX_INTR; i++)
1763 if(!ixgb_clean_rx_irq(adapter) &
1764 !ixgb_clean_tx_irq(adapter))
1765 break;
1766 #endif
1767 return IRQ_HANDLED;
1768 }
1769
1770 #ifdef CONFIG_IXGB_NAPI
1771 /**
1772 * ixgb_clean - NAPI Rx polling callback
1773 * @adapter: board private structure
1774 **/
1775
1776 static int
1777 ixgb_clean(struct napi_struct *napi, int budget)
1778 {
1779 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1780 struct net_device *netdev = adapter->netdev;
1781 int tx_cleaned;
1782 int work_done = 0;
1783
1784 tx_cleaned = ixgb_clean_tx_irq(adapter);
1785 ixgb_clean_rx_irq(adapter, &work_done, budget);
1786
1787 /* if no Tx and not enough Rx work done, exit the polling mode */
1788 if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1789 netif_rx_complete(netdev, napi);
1790 ixgb_irq_enable(adapter);
1791 }
1792
1793 return work_done;
1794 }
1795 #endif
1796
1797 /**
1798 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1799 * @adapter: board private structure
1800 **/
1801
1802 static boolean_t
1803 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1804 {
1805 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1806 struct net_device *netdev = adapter->netdev;
1807 struct ixgb_tx_desc *tx_desc, *eop_desc;
1808 struct ixgb_buffer *buffer_info;
1809 unsigned int i, eop;
1810 boolean_t cleaned = FALSE;
1811
1812 i = tx_ring->next_to_clean;
1813 eop = tx_ring->buffer_info[i].next_to_watch;
1814 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1815
1816 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1817
1818 for(cleaned = FALSE; !cleaned; ) {
1819 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1820 buffer_info = &tx_ring->buffer_info[i];
1821
1822 if (tx_desc->popts
1823 & (IXGB_TX_DESC_POPTS_TXSM |
1824 IXGB_TX_DESC_POPTS_IXSM))
1825 adapter->hw_csum_tx_good++;
1826
1827 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1828
1829 *(uint32_t *)&(tx_desc->status) = 0;
1830
1831 cleaned = (i == eop);
1832 if(++i == tx_ring->count) i = 0;
1833 }
1834
1835 eop = tx_ring->buffer_info[i].next_to_watch;
1836 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1837 }
1838
1839 tx_ring->next_to_clean = i;
1840
1841 if (unlikely(netif_queue_stopped(netdev))) {
1842 spin_lock(&adapter->tx_lock);
1843 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1844 (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1845 netif_wake_queue(netdev);
1846 spin_unlock(&adapter->tx_lock);
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 boolean_t
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 uint32_t length;
1935 unsigned int i, j;
1936 boolean_t 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 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2033 } else {
2034 netif_receive_skb(skb);
2035 }
2036 #else /* CONFIG_IXGB_NAPI */
2037 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2038 vlan_hwaccel_rx(skb, adapter->vlgrp,
2039 le16_to_cpu(rx_desc->special) &
2040 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2041 } else {
2042 netif_rx(skb);
2043 }
2044 #endif /* CONFIG_IXGB_NAPI */
2045 netdev->last_rx = jiffies;
2046
2047 rxdesc_done:
2048 /* clean up descriptor, might be written over by hw */
2049 rx_desc->status = 0;
2050
2051 /* use prefetched values */
2052 rx_desc = next_rxd;
2053 buffer_info = next_buffer;
2054 }
2055
2056 rx_ring->next_to_clean = i;
2057
2058 ixgb_alloc_rx_buffers(adapter);
2059
2060 return cleaned;
2061 }
2062
2063 /**
2064 * ixgb_alloc_rx_buffers - Replace used receive buffers
2065 * @adapter: address of board private structure
2066 **/
2067
2068 static void
2069 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2070 {
2071 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2072 struct net_device *netdev = adapter->netdev;
2073 struct pci_dev *pdev = adapter->pdev;
2074 struct ixgb_rx_desc *rx_desc;
2075 struct ixgb_buffer *buffer_info;
2076 struct sk_buff *skb;
2077 unsigned int i;
2078 int num_group_tail_writes;
2079 long cleancount;
2080
2081 i = rx_ring->next_to_use;
2082 buffer_info = &rx_ring->buffer_info[i];
2083 cleancount = IXGB_DESC_UNUSED(rx_ring);
2084
2085 num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2086
2087 /* leave three descriptors unused */
2088 while(--cleancount > 2) {
2089 /* recycle! its good for you */
2090 skb = buffer_info->skb;
2091 if (skb) {
2092 skb_trim(skb, 0);
2093 goto map_skb;
2094 }
2095
2096 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2097 + NET_IP_ALIGN);
2098 if (unlikely(!skb)) {
2099 /* Better luck next round */
2100 adapter->alloc_rx_buff_failed++;
2101 break;
2102 }
2103
2104 /* Make buffer alignment 2 beyond a 16 byte boundary
2105 * this will result in a 16 byte aligned IP header after
2106 * the 14 byte MAC header is removed
2107 */
2108 skb_reserve(skb, NET_IP_ALIGN);
2109
2110 buffer_info->skb = skb;
2111 buffer_info->length = adapter->rx_buffer_len;
2112 map_skb:
2113 buffer_info->dma = pci_map_single(pdev,
2114 skb->data,
2115 adapter->rx_buffer_len,
2116 PCI_DMA_FROMDEVICE);
2117
2118 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2119 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2120 /* guarantee DD bit not set now before h/w gets descriptor
2121 * this is the rest of the workaround for h/w double
2122 * writeback. */
2123 rx_desc->status = 0;
2124
2125
2126 if(++i == rx_ring->count) i = 0;
2127 buffer_info = &rx_ring->buffer_info[i];
2128 }
2129
2130 if (likely(rx_ring->next_to_use != i)) {
2131 rx_ring->next_to_use = i;
2132 if (unlikely(i-- == 0))
2133 i = (rx_ring->count - 1);
2134
2135 /* Force memory writes to complete before letting h/w
2136 * know there are new descriptors to fetch. (Only
2137 * applicable for weak-ordered memory model archs, such
2138 * as IA-64). */
2139 wmb();
2140 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2141 }
2142 }
2143
2144 /**
2145 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2146 *
2147 * @param netdev network interface device structure
2148 * @param grp indicates to enable or disable tagging/stripping
2149 **/
2150 static void
2151 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2152 {
2153 struct ixgb_adapter *adapter = netdev_priv(netdev);
2154 uint32_t ctrl, rctl;
2155
2156 ixgb_irq_disable(adapter);
2157 adapter->vlgrp = grp;
2158
2159 if(grp) {
2160 /* enable VLAN tag insert/strip */
2161 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2162 ctrl |= IXGB_CTRL0_VME;
2163 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2164
2165 /* enable VLAN receive filtering */
2166
2167 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2168 rctl |= IXGB_RCTL_VFE;
2169 rctl &= ~IXGB_RCTL_CFIEN;
2170 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2171 } else {
2172 /* disable VLAN tag insert/strip */
2173
2174 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2175 ctrl &= ~IXGB_CTRL0_VME;
2176 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2177
2178 /* disable VLAN filtering */
2179
2180 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2181 rctl &= ~IXGB_RCTL_VFE;
2182 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2183 }
2184
2185 ixgb_irq_enable(adapter);
2186 }
2187
2188 static void
2189 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2190 {
2191 struct ixgb_adapter *adapter = netdev_priv(netdev);
2192 uint32_t vfta, index;
2193
2194 /* add VID to filter table */
2195
2196 index = (vid >> 5) & 0x7F;
2197 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2198 vfta |= (1 << (vid & 0x1F));
2199 ixgb_write_vfta(&adapter->hw, index, vfta);
2200 }
2201
2202 static void
2203 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2204 {
2205 struct ixgb_adapter *adapter = netdev_priv(netdev);
2206 uint32_t vfta, index;
2207
2208 ixgb_irq_disable(adapter);
2209
2210 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2211
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 uint16_t 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 */
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