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drivers/net/: use DEFINE_PCI_DEVICE_TABLE()
[deliverable/linux.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2008 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 char ixgb_driver_name[] = "ixgb";
32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
33
34 #define DRIVERNAPI "-NAPI"
35 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
36 const char ixgb_driver_version[] = DRV_VERSION;
37 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
38
39 #define IXGB_CB_LENGTH 256
40 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
41 module_param(copybreak, uint, 0644);
42 MODULE_PARM_DESC(copybreak,
43 "Maximum size of packet that is copied to a new buffer on receive");
44
45 /* ixgb_pci_tbl - PCI Device ID Table
46 *
47 * Wildcard entries (PCI_ANY_ID) should come last
48 * Last entry must be all 0s
49 *
50 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
51 * Class, Class Mask, private data (not used) }
52 */
53 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
54 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
55 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62
63 /* required last entry */
64 {0,}
65 };
66
67 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
68
69 /* Local Function Prototypes */
70 static int ixgb_init_module(void);
71 static void ixgb_exit_module(void);
72 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
73 static void __devexit ixgb_remove(struct pci_dev *pdev);
74 static int ixgb_sw_init(struct ixgb_adapter *adapter);
75 static int ixgb_open(struct net_device *netdev);
76 static int ixgb_close(struct net_device *netdev);
77 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
78 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
79 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
80 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
81 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
82 static void ixgb_set_multi(struct net_device *netdev);
83 static void ixgb_watchdog(unsigned long data);
84 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
85 struct net_device *netdev);
86 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
87 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
88 static int ixgb_set_mac(struct net_device *netdev, void *p);
89 static irqreturn_t ixgb_intr(int irq, void *data);
90 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
91
92 static int ixgb_clean(struct napi_struct *, int);
93 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
94 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
95
96 static void ixgb_tx_timeout(struct net_device *dev);
97 static void ixgb_tx_timeout_task(struct work_struct *work);
98
99 static void ixgb_vlan_rx_register(struct net_device *netdev,
100 struct vlan_group *grp);
101 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
102 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
103 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
104
105 #ifdef CONFIG_NET_POLL_CONTROLLER
106 /* for netdump / net console */
107 static void ixgb_netpoll(struct net_device *dev);
108 #endif
109
110 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
111 enum pci_channel_state state);
112 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
113 static void ixgb_io_resume (struct pci_dev *pdev);
114
115 static struct pci_error_handlers ixgb_err_handler = {
116 .error_detected = ixgb_io_error_detected,
117 .slot_reset = ixgb_io_slot_reset,
118 .resume = ixgb_io_resume,
119 };
120
121 static struct pci_driver ixgb_driver = {
122 .name = ixgb_driver_name,
123 .id_table = ixgb_pci_tbl,
124 .probe = ixgb_probe,
125 .remove = __devexit_p(ixgb_remove),
126 .err_handler = &ixgb_err_handler
127 };
128
129 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
130 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
131 MODULE_LICENSE("GPL");
132 MODULE_VERSION(DRV_VERSION);
133
134 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
135 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
136 module_param(debug, int, 0);
137 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
138
139 /**
140 * ixgb_init_module - Driver Registration Routine
141 *
142 * ixgb_init_module is the first routine called when the driver is
143 * loaded. All it does is register with the PCI subsystem.
144 **/
145
146 static int __init
147 ixgb_init_module(void)
148 {
149 printk(KERN_INFO "%s - version %s\n",
150 ixgb_driver_string, ixgb_driver_version);
151
152 printk(KERN_INFO "%s\n", ixgb_copyright);
153
154 return pci_register_driver(&ixgb_driver);
155 }
156
157 module_init(ixgb_init_module);
158
159 /**
160 * ixgb_exit_module - Driver Exit Cleanup Routine
161 *
162 * ixgb_exit_module is called just before the driver is removed
163 * from memory.
164 **/
165
166 static void __exit
167 ixgb_exit_module(void)
168 {
169 pci_unregister_driver(&ixgb_driver);
170 }
171
172 module_exit(ixgb_exit_module);
173
174 /**
175 * ixgb_irq_disable - Mask off interrupt generation on the NIC
176 * @adapter: board private structure
177 **/
178
179 static void
180 ixgb_irq_disable(struct ixgb_adapter *adapter)
181 {
182 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
183 IXGB_WRITE_FLUSH(&adapter->hw);
184 synchronize_irq(adapter->pdev->irq);
185 }
186
187 /**
188 * ixgb_irq_enable - Enable default interrupt generation settings
189 * @adapter: board private structure
190 **/
191
192 static void
193 ixgb_irq_enable(struct ixgb_adapter *adapter)
194 {
195 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
196 IXGB_INT_TXDW | IXGB_INT_LSC;
197 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
198 val |= IXGB_INT_GPI0;
199 IXGB_WRITE_REG(&adapter->hw, IMS, val);
200 IXGB_WRITE_FLUSH(&adapter->hw);
201 }
202
203 int
204 ixgb_up(struct ixgb_adapter *adapter)
205 {
206 struct net_device *netdev = adapter->netdev;
207 int err, irq_flags = IRQF_SHARED;
208 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
209 struct ixgb_hw *hw = &adapter->hw;
210
211 /* hardware has been reset, we need to reload some things */
212
213 ixgb_rar_set(hw, netdev->dev_addr, 0);
214 ixgb_set_multi(netdev);
215
216 ixgb_restore_vlan(adapter);
217
218 ixgb_configure_tx(adapter);
219 ixgb_setup_rctl(adapter);
220 ixgb_configure_rx(adapter);
221 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
222
223 /* disable interrupts and get the hardware into a known state */
224 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
225
226 /* only enable MSI if bus is in PCI-X mode */
227 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
228 err = pci_enable_msi(adapter->pdev);
229 if (!err) {
230 adapter->have_msi = 1;
231 irq_flags = 0;
232 }
233 /* proceed to try to request regular interrupt */
234 }
235
236 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
237 netdev->name, netdev);
238 if (err) {
239 if (adapter->have_msi)
240 pci_disable_msi(adapter->pdev);
241 DPRINTK(PROBE, ERR,
242 "Unable to allocate interrupt Error: %d\n", err);
243 return err;
244 }
245
246 if ((hw->max_frame_size != max_frame) ||
247 (hw->max_frame_size !=
248 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
249
250 hw->max_frame_size = max_frame;
251
252 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
253
254 if (hw->max_frame_size >
255 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
256 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
257
258 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
259 ctrl0 |= IXGB_CTRL0_JFE;
260 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
261 }
262 }
263 }
264
265 clear_bit(__IXGB_DOWN, &adapter->flags);
266
267 napi_enable(&adapter->napi);
268 ixgb_irq_enable(adapter);
269
270 netif_wake_queue(netdev);
271
272 mod_timer(&adapter->watchdog_timer, jiffies);
273
274 return 0;
275 }
276
277 void
278 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
279 {
280 struct net_device *netdev = adapter->netdev;
281
282 /* prevent the interrupt handler from restarting watchdog */
283 set_bit(__IXGB_DOWN, &adapter->flags);
284
285 napi_disable(&adapter->napi);
286 /* waiting for NAPI to complete can re-enable interrupts */
287 ixgb_irq_disable(adapter);
288 free_irq(adapter->pdev->irq, netdev);
289
290 if (adapter->have_msi)
291 pci_disable_msi(adapter->pdev);
292
293 if (kill_watchdog)
294 del_timer_sync(&adapter->watchdog_timer);
295
296 adapter->link_speed = 0;
297 adapter->link_duplex = 0;
298 netif_carrier_off(netdev);
299 netif_stop_queue(netdev);
300
301 ixgb_reset(adapter);
302 ixgb_clean_tx_ring(adapter);
303 ixgb_clean_rx_ring(adapter);
304 }
305
306 void
307 ixgb_reset(struct ixgb_adapter *adapter)
308 {
309 struct ixgb_hw *hw = &adapter->hw;
310
311 ixgb_adapter_stop(hw);
312 if (!ixgb_init_hw(hw))
313 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
314
315 /* restore frame size information */
316 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
317 if (hw->max_frame_size >
318 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
319 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
320 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
321 ctrl0 |= IXGB_CTRL0_JFE;
322 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
323 }
324 }
325 }
326
327 static const struct net_device_ops ixgb_netdev_ops = {
328 .ndo_open = ixgb_open,
329 .ndo_stop = ixgb_close,
330 .ndo_start_xmit = ixgb_xmit_frame,
331 .ndo_get_stats = ixgb_get_stats,
332 .ndo_set_multicast_list = ixgb_set_multi,
333 .ndo_validate_addr = eth_validate_addr,
334 .ndo_set_mac_address = ixgb_set_mac,
335 .ndo_change_mtu = ixgb_change_mtu,
336 .ndo_tx_timeout = ixgb_tx_timeout,
337 .ndo_vlan_rx_register = ixgb_vlan_rx_register,
338 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
339 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
340 #ifdef CONFIG_NET_POLL_CONTROLLER
341 .ndo_poll_controller = ixgb_netpoll,
342 #endif
343 };
344
345 /**
346 * ixgb_probe - Device Initialization Routine
347 * @pdev: PCI device information struct
348 * @ent: entry in ixgb_pci_tbl
349 *
350 * Returns 0 on success, negative on failure
351 *
352 * ixgb_probe initializes an adapter identified by a pci_dev structure.
353 * The OS initialization, configuring of the adapter private structure,
354 * and a hardware reset occur.
355 **/
356
357 static int __devinit
358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
359 {
360 struct net_device *netdev = NULL;
361 struct ixgb_adapter *adapter;
362 static int cards_found = 0;
363 int pci_using_dac;
364 int i;
365 int err;
366
367 err = pci_enable_device(pdev);
368 if (err)
369 return err;
370
371 if (!(err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) &&
372 !(err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))) {
373 pci_using_dac = 1;
374 } else {
375 if ((err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) ||
376 (err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))) {
377 printk(KERN_ERR
378 "ixgb: No usable DMA configuration, aborting\n");
379 goto err_dma_mask;
380 }
381 pci_using_dac = 0;
382 }
383
384 err = pci_request_regions(pdev, ixgb_driver_name);
385 if (err)
386 goto err_request_regions;
387
388 pci_set_master(pdev);
389
390 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
391 if (!netdev) {
392 err = -ENOMEM;
393 goto err_alloc_etherdev;
394 }
395
396 SET_NETDEV_DEV(netdev, &pdev->dev);
397
398 pci_set_drvdata(pdev, netdev);
399 adapter = netdev_priv(netdev);
400 adapter->netdev = netdev;
401 adapter->pdev = pdev;
402 adapter->hw.back = adapter;
403 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
404
405 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
406 if (!adapter->hw.hw_addr) {
407 err = -EIO;
408 goto err_ioremap;
409 }
410
411 for (i = BAR_1; i <= BAR_5; i++) {
412 if (pci_resource_len(pdev, i) == 0)
413 continue;
414 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
415 adapter->hw.io_base = pci_resource_start(pdev, i);
416 break;
417 }
418 }
419
420 netdev->netdev_ops = &ixgb_netdev_ops;
421 ixgb_set_ethtool_ops(netdev);
422 netdev->watchdog_timeo = 5 * HZ;
423 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
424
425 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
426
427 adapter->bd_number = cards_found;
428 adapter->link_speed = 0;
429 adapter->link_duplex = 0;
430
431 /* setup the private structure */
432
433 err = ixgb_sw_init(adapter);
434 if (err)
435 goto err_sw_init;
436
437 netdev->features = NETIF_F_SG |
438 NETIF_F_HW_CSUM |
439 NETIF_F_HW_VLAN_TX |
440 NETIF_F_HW_VLAN_RX |
441 NETIF_F_HW_VLAN_FILTER;
442 netdev->features |= NETIF_F_TSO;
443
444 if (pci_using_dac)
445 netdev->features |= NETIF_F_HIGHDMA;
446
447 /* make sure the EEPROM is good */
448
449 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
450 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
451 err = -EIO;
452 goto err_eeprom;
453 }
454
455 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
456 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
457
458 if (!is_valid_ether_addr(netdev->perm_addr)) {
459 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
460 err = -EIO;
461 goto err_eeprom;
462 }
463
464 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
465
466 init_timer(&adapter->watchdog_timer);
467 adapter->watchdog_timer.function = &ixgb_watchdog;
468 adapter->watchdog_timer.data = (unsigned long)adapter;
469
470 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
471
472 strcpy(netdev->name, "eth%d");
473 err = register_netdev(netdev);
474 if (err)
475 goto err_register;
476
477 /* carrier off reporting is important to ethtool even BEFORE open */
478 netif_carrier_off(netdev);
479
480 DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
481 ixgb_check_options(adapter);
482 /* reset the hardware with the new settings */
483
484 ixgb_reset(adapter);
485
486 cards_found++;
487 return 0;
488
489 err_register:
490 err_sw_init:
491 err_eeprom:
492 iounmap(adapter->hw.hw_addr);
493 err_ioremap:
494 free_netdev(netdev);
495 err_alloc_etherdev:
496 pci_release_regions(pdev);
497 err_request_regions:
498 err_dma_mask:
499 pci_disable_device(pdev);
500 return err;
501 }
502
503 /**
504 * ixgb_remove - Device Removal Routine
505 * @pdev: PCI device information struct
506 *
507 * ixgb_remove is called by the PCI subsystem to alert the driver
508 * that it should release a PCI device. The could be caused by a
509 * Hot-Plug event, or because the driver is going to be removed from
510 * memory.
511 **/
512
513 static void __devexit
514 ixgb_remove(struct pci_dev *pdev)
515 {
516 struct net_device *netdev = pci_get_drvdata(pdev);
517 struct ixgb_adapter *adapter = netdev_priv(netdev);
518
519 flush_scheduled_work();
520
521 unregister_netdev(netdev);
522
523 iounmap(adapter->hw.hw_addr);
524 pci_release_regions(pdev);
525
526 free_netdev(netdev);
527 }
528
529 /**
530 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
531 * @adapter: board private structure to initialize
532 *
533 * ixgb_sw_init initializes the Adapter private data structure.
534 * Fields are initialized based on PCI device information and
535 * OS network device settings (MTU size).
536 **/
537
538 static int __devinit
539 ixgb_sw_init(struct ixgb_adapter *adapter)
540 {
541 struct ixgb_hw *hw = &adapter->hw;
542 struct net_device *netdev = adapter->netdev;
543 struct pci_dev *pdev = adapter->pdev;
544
545 /* PCI config space info */
546
547 hw->vendor_id = pdev->vendor;
548 hw->device_id = pdev->device;
549 hw->subsystem_vendor_id = pdev->subsystem_vendor;
550 hw->subsystem_id = pdev->subsystem_device;
551
552 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
553 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
554
555 if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
556 || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
557 || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
558 || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
559 hw->mac_type = ixgb_82597;
560 else {
561 /* should never have loaded on this device */
562 DPRINTK(PROBE, ERR, "unsupported device id\n");
563 }
564
565 /* enable flow control to be programmed */
566 hw->fc.send_xon = 1;
567
568 set_bit(__IXGB_DOWN, &adapter->flags);
569 return 0;
570 }
571
572 /**
573 * ixgb_open - Called when a network interface is made active
574 * @netdev: network interface device structure
575 *
576 * Returns 0 on success, negative value on failure
577 *
578 * The open entry point is called when a network interface is made
579 * active by the system (IFF_UP). At this point all resources needed
580 * for transmit and receive operations are allocated, the interrupt
581 * handler is registered with the OS, the watchdog timer is started,
582 * and the stack is notified that the interface is ready.
583 **/
584
585 static int
586 ixgb_open(struct net_device *netdev)
587 {
588 struct ixgb_adapter *adapter = netdev_priv(netdev);
589 int err;
590
591 /* allocate transmit descriptors */
592 err = ixgb_setup_tx_resources(adapter);
593 if (err)
594 goto err_setup_tx;
595
596 netif_carrier_off(netdev);
597
598 /* allocate receive descriptors */
599
600 err = ixgb_setup_rx_resources(adapter);
601 if (err)
602 goto err_setup_rx;
603
604 err = ixgb_up(adapter);
605 if (err)
606 goto err_up;
607
608 netif_start_queue(netdev);
609
610 return 0;
611
612 err_up:
613 ixgb_free_rx_resources(adapter);
614 err_setup_rx:
615 ixgb_free_tx_resources(adapter);
616 err_setup_tx:
617 ixgb_reset(adapter);
618
619 return err;
620 }
621
622 /**
623 * ixgb_close - Disables a network interface
624 * @netdev: network interface device structure
625 *
626 * Returns 0, this is not allowed to fail
627 *
628 * The close entry point is called when an interface is de-activated
629 * by the OS. The hardware is still under the drivers control, but
630 * needs to be disabled. A global MAC reset is issued to stop the
631 * hardware, and all transmit and receive resources are freed.
632 **/
633
634 static int
635 ixgb_close(struct net_device *netdev)
636 {
637 struct ixgb_adapter *adapter = netdev_priv(netdev);
638
639 ixgb_down(adapter, true);
640
641 ixgb_free_tx_resources(adapter);
642 ixgb_free_rx_resources(adapter);
643
644 return 0;
645 }
646
647 /**
648 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
649 * @adapter: board private structure
650 *
651 * Return 0 on success, negative on failure
652 **/
653
654 int
655 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
656 {
657 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
658 struct pci_dev *pdev = adapter->pdev;
659 int size;
660
661 size = sizeof(struct ixgb_buffer) * txdr->count;
662 txdr->buffer_info = vmalloc(size);
663 if (!txdr->buffer_info) {
664 DPRINTK(PROBE, ERR,
665 "Unable to allocate transmit descriptor ring memory\n");
666 return -ENOMEM;
667 }
668 memset(txdr->buffer_info, 0, size);
669
670 /* round up to nearest 4K */
671
672 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
673 txdr->size = ALIGN(txdr->size, 4096);
674
675 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
676 if (!txdr->desc) {
677 vfree(txdr->buffer_info);
678 DPRINTK(PROBE, ERR,
679 "Unable to allocate transmit descriptor memory\n");
680 return -ENOMEM;
681 }
682 memset(txdr->desc, 0, txdr->size);
683
684 txdr->next_to_use = 0;
685 txdr->next_to_clean = 0;
686
687 return 0;
688 }
689
690 /**
691 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
692 * @adapter: board private structure
693 *
694 * Configure the Tx unit of the MAC after a reset.
695 **/
696
697 static void
698 ixgb_configure_tx(struct ixgb_adapter *adapter)
699 {
700 u64 tdba = adapter->tx_ring.dma;
701 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
702 u32 tctl;
703 struct ixgb_hw *hw = &adapter->hw;
704
705 /* Setup the Base and Length of the Tx Descriptor Ring
706 * tx_ring.dma can be either a 32 or 64 bit value
707 */
708
709 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
710 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
711
712 IXGB_WRITE_REG(hw, TDLEN, tdlen);
713
714 /* Setup the HW Tx Head and Tail descriptor pointers */
715
716 IXGB_WRITE_REG(hw, TDH, 0);
717 IXGB_WRITE_REG(hw, TDT, 0);
718
719 /* don't set up txdctl, it induces performance problems if configured
720 * incorrectly */
721 /* Set the Tx Interrupt Delay register */
722
723 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
724
725 /* Program the Transmit Control Register */
726
727 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
728 IXGB_WRITE_REG(hw, TCTL, tctl);
729
730 /* Setup Transmit Descriptor Settings for this adapter */
731 adapter->tx_cmd_type =
732 IXGB_TX_DESC_TYPE |
733 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
734 }
735
736 /**
737 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
738 * @adapter: board private structure
739 *
740 * Returns 0 on success, negative on failure
741 **/
742
743 int
744 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
745 {
746 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
747 struct pci_dev *pdev = adapter->pdev;
748 int size;
749
750 size = sizeof(struct ixgb_buffer) * rxdr->count;
751 rxdr->buffer_info = vmalloc(size);
752 if (!rxdr->buffer_info) {
753 DPRINTK(PROBE, ERR,
754 "Unable to allocate receive descriptor ring\n");
755 return -ENOMEM;
756 }
757 memset(rxdr->buffer_info, 0, size);
758
759 /* Round up to nearest 4K */
760
761 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
762 rxdr->size = ALIGN(rxdr->size, 4096);
763
764 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
765
766 if (!rxdr->desc) {
767 vfree(rxdr->buffer_info);
768 DPRINTK(PROBE, ERR,
769 "Unable to allocate receive descriptors\n");
770 return -ENOMEM;
771 }
772 memset(rxdr->desc, 0, rxdr->size);
773
774 rxdr->next_to_clean = 0;
775 rxdr->next_to_use = 0;
776
777 return 0;
778 }
779
780 /**
781 * ixgb_setup_rctl - configure the receive control register
782 * @adapter: Board private structure
783 **/
784
785 static void
786 ixgb_setup_rctl(struct ixgb_adapter *adapter)
787 {
788 u32 rctl;
789
790 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
791
792 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
793
794 rctl |=
795 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
796 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
797 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
798
799 rctl |= IXGB_RCTL_SECRC;
800
801 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
802 rctl |= IXGB_RCTL_BSIZE_2048;
803 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
804 rctl |= IXGB_RCTL_BSIZE_4096;
805 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
806 rctl |= IXGB_RCTL_BSIZE_8192;
807 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
808 rctl |= IXGB_RCTL_BSIZE_16384;
809
810 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
811 }
812
813 /**
814 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
815 * @adapter: board private structure
816 *
817 * Configure the Rx unit of the MAC after a reset.
818 **/
819
820 static void
821 ixgb_configure_rx(struct ixgb_adapter *adapter)
822 {
823 u64 rdba = adapter->rx_ring.dma;
824 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
825 struct ixgb_hw *hw = &adapter->hw;
826 u32 rctl;
827 u32 rxcsum;
828
829 /* make sure receives are disabled while setting up the descriptors */
830
831 rctl = IXGB_READ_REG(hw, RCTL);
832 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
833
834 /* set the Receive Delay Timer Register */
835
836 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
837
838 /* Setup the Base and Length of the Rx Descriptor Ring */
839
840 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
841 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
842
843 IXGB_WRITE_REG(hw, RDLEN, rdlen);
844
845 /* Setup the HW Rx Head and Tail Descriptor Pointers */
846 IXGB_WRITE_REG(hw, RDH, 0);
847 IXGB_WRITE_REG(hw, RDT, 0);
848
849 /* due to the hardware errata with RXDCTL, we are unable to use any of
850 * the performance enhancing features of it without causing other
851 * subtle bugs, some of the bugs could include receive length
852 * corruption at high data rates (WTHRESH > 0) and/or receive
853 * descriptor ring irregularites (particularly in hardware cache) */
854 IXGB_WRITE_REG(hw, RXDCTL, 0);
855
856 /* Enable Receive Checksum Offload for TCP and UDP */
857 if (adapter->rx_csum) {
858 rxcsum = IXGB_READ_REG(hw, RXCSUM);
859 rxcsum |= IXGB_RXCSUM_TUOFL;
860 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
861 }
862
863 /* Enable Receives */
864
865 IXGB_WRITE_REG(hw, RCTL, rctl);
866 }
867
868 /**
869 * ixgb_free_tx_resources - Free Tx Resources
870 * @adapter: board private structure
871 *
872 * Free all transmit software resources
873 **/
874
875 void
876 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
877 {
878 struct pci_dev *pdev = adapter->pdev;
879
880 ixgb_clean_tx_ring(adapter);
881
882 vfree(adapter->tx_ring.buffer_info);
883 adapter->tx_ring.buffer_info = NULL;
884
885 pci_free_consistent(pdev, adapter->tx_ring.size,
886 adapter->tx_ring.desc, adapter->tx_ring.dma);
887
888 adapter->tx_ring.desc = NULL;
889 }
890
891 static void
892 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
893 struct ixgb_buffer *buffer_info)
894 {
895 if (buffer_info->dma) {
896 if (buffer_info->mapped_as_page)
897 pci_unmap_page(adapter->pdev, buffer_info->dma,
898 buffer_info->length, PCI_DMA_TODEVICE);
899 else
900 pci_unmap_single(adapter->pdev, buffer_info->dma,
901 buffer_info->length,
902 PCI_DMA_TODEVICE);
903 buffer_info->dma = 0;
904 }
905
906 if (buffer_info->skb) {
907 dev_kfree_skb_any(buffer_info->skb);
908 buffer_info->skb = NULL;
909 }
910 buffer_info->time_stamp = 0;
911 /* these fields must always be initialized in tx
912 * buffer_info->length = 0;
913 * buffer_info->next_to_watch = 0; */
914 }
915
916 /**
917 * ixgb_clean_tx_ring - Free Tx Buffers
918 * @adapter: board private structure
919 **/
920
921 static void
922 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
923 {
924 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
925 struct ixgb_buffer *buffer_info;
926 unsigned long size;
927 unsigned int i;
928
929 /* Free all the Tx ring sk_buffs */
930
931 for (i = 0; i < tx_ring->count; i++) {
932 buffer_info = &tx_ring->buffer_info[i];
933 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
934 }
935
936 size = sizeof(struct ixgb_buffer) * tx_ring->count;
937 memset(tx_ring->buffer_info, 0, size);
938
939 /* Zero out the descriptor ring */
940
941 memset(tx_ring->desc, 0, tx_ring->size);
942
943 tx_ring->next_to_use = 0;
944 tx_ring->next_to_clean = 0;
945
946 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
947 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
948 }
949
950 /**
951 * ixgb_free_rx_resources - Free Rx Resources
952 * @adapter: board private structure
953 *
954 * Free all receive software resources
955 **/
956
957 void
958 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
959 {
960 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
961 struct pci_dev *pdev = adapter->pdev;
962
963 ixgb_clean_rx_ring(adapter);
964
965 vfree(rx_ring->buffer_info);
966 rx_ring->buffer_info = NULL;
967
968 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
969
970 rx_ring->desc = NULL;
971 }
972
973 /**
974 * ixgb_clean_rx_ring - Free Rx Buffers
975 * @adapter: board private structure
976 **/
977
978 static void
979 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
980 {
981 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
982 struct ixgb_buffer *buffer_info;
983 struct pci_dev *pdev = adapter->pdev;
984 unsigned long size;
985 unsigned int i;
986
987 /* Free all the Rx ring sk_buffs */
988
989 for (i = 0; i < rx_ring->count; i++) {
990 buffer_info = &rx_ring->buffer_info[i];
991 if (buffer_info->dma) {
992 pci_unmap_single(pdev,
993 buffer_info->dma,
994 buffer_info->length,
995 PCI_DMA_FROMDEVICE);
996 buffer_info->dma = 0;
997 buffer_info->length = 0;
998 }
999
1000 if (buffer_info->skb) {
1001 dev_kfree_skb(buffer_info->skb);
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 rctl &= ~IXGB_RCTL_VFE;
1070 } else {
1071 if (netdev->flags & IFF_ALLMULTI) {
1072 rctl |= IXGB_RCTL_MPE;
1073 rctl &= ~IXGB_RCTL_UPE;
1074 } else {
1075 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1076 }
1077 rctl |= IXGB_RCTL_VFE;
1078 }
1079
1080 if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1081 rctl |= IXGB_RCTL_MPE;
1082 IXGB_WRITE_REG(hw, RCTL, rctl);
1083 } else {
1084 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1085 IXGB_ETH_LENGTH_OF_ADDRESS];
1086
1087 IXGB_WRITE_REG(hw, RCTL, rctl);
1088
1089 for (i = 0, mc_ptr = netdev->mc_list;
1090 mc_ptr;
1091 i++, mc_ptr = mc_ptr->next)
1092 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1093 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1094
1095 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1096 }
1097 }
1098
1099 /**
1100 * ixgb_watchdog - Timer Call-back
1101 * @data: pointer to netdev cast into an unsigned long
1102 **/
1103
1104 static void
1105 ixgb_watchdog(unsigned long data)
1106 {
1107 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1108 struct net_device *netdev = adapter->netdev;
1109 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1110
1111 ixgb_check_for_link(&adapter->hw);
1112
1113 if (ixgb_check_for_bad_link(&adapter->hw)) {
1114 /* force the reset path */
1115 netif_stop_queue(netdev);
1116 }
1117
1118 if (adapter->hw.link_up) {
1119 if (!netif_carrier_ok(netdev)) {
1120 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1121 "Full Duplex, Flow Control: %s\n",
1122 netdev->name,
1123 (adapter->hw.fc.type == ixgb_fc_full) ?
1124 "RX/TX" :
1125 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1126 "RX" :
1127 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1128 "TX" : "None")));
1129 adapter->link_speed = 10000;
1130 adapter->link_duplex = FULL_DUPLEX;
1131 netif_carrier_on(netdev);
1132 }
1133 } else {
1134 if (netif_carrier_ok(netdev)) {
1135 adapter->link_speed = 0;
1136 adapter->link_duplex = 0;
1137 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1138 netdev->name);
1139 netif_carrier_off(netdev);
1140 }
1141 }
1142
1143 ixgb_update_stats(adapter);
1144
1145 if (!netif_carrier_ok(netdev)) {
1146 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1147 /* We've lost link, so the controller stops DMA,
1148 * but we've got queued Tx work that's never going
1149 * to get done, so reset controller to flush Tx.
1150 * (Do the reset outside of interrupt context). */
1151 schedule_work(&adapter->tx_timeout_task);
1152 /* return immediately since reset is imminent */
1153 return;
1154 }
1155 }
1156
1157 /* Force detection of hung controller every watchdog period */
1158 adapter->detect_tx_hung = true;
1159
1160 /* generate an interrupt to force clean up of any stragglers */
1161 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1162
1163 /* Reset the timer */
1164 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1165 }
1166
1167 #define IXGB_TX_FLAGS_CSUM 0x00000001
1168 #define IXGB_TX_FLAGS_VLAN 0x00000002
1169 #define IXGB_TX_FLAGS_TSO 0x00000004
1170
1171 static int
1172 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1173 {
1174 struct ixgb_context_desc *context_desc;
1175 unsigned int i;
1176 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1177 u16 ipcse, tucse, mss;
1178 int err;
1179
1180 if (likely(skb_is_gso(skb))) {
1181 struct ixgb_buffer *buffer_info;
1182 struct iphdr *iph;
1183
1184 if (skb_header_cloned(skb)) {
1185 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1186 if (err)
1187 return err;
1188 }
1189
1190 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1191 mss = skb_shinfo(skb)->gso_size;
1192 iph = ip_hdr(skb);
1193 iph->tot_len = 0;
1194 iph->check = 0;
1195 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1196 iph->daddr, 0,
1197 IPPROTO_TCP, 0);
1198 ipcss = skb_network_offset(skb);
1199 ipcso = (void *)&(iph->check) - (void *)skb->data;
1200 ipcse = skb_transport_offset(skb) - 1;
1201 tucss = skb_transport_offset(skb);
1202 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1203 tucse = 0;
1204
1205 i = adapter->tx_ring.next_to_use;
1206 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1207 buffer_info = &adapter->tx_ring.buffer_info[i];
1208 WARN_ON(buffer_info->dma != 0);
1209
1210 context_desc->ipcss = ipcss;
1211 context_desc->ipcso = ipcso;
1212 context_desc->ipcse = cpu_to_le16(ipcse);
1213 context_desc->tucss = tucss;
1214 context_desc->tucso = tucso;
1215 context_desc->tucse = cpu_to_le16(tucse);
1216 context_desc->mss = cpu_to_le16(mss);
1217 context_desc->hdr_len = hdr_len;
1218 context_desc->status = 0;
1219 context_desc->cmd_type_len = cpu_to_le32(
1220 IXGB_CONTEXT_DESC_TYPE
1221 | IXGB_CONTEXT_DESC_CMD_TSE
1222 | IXGB_CONTEXT_DESC_CMD_IP
1223 | IXGB_CONTEXT_DESC_CMD_TCP
1224 | IXGB_CONTEXT_DESC_CMD_IDE
1225 | (skb->len - (hdr_len)));
1226
1227
1228 if (++i == adapter->tx_ring.count) i = 0;
1229 adapter->tx_ring.next_to_use = i;
1230
1231 return 1;
1232 }
1233
1234 return 0;
1235 }
1236
1237 static bool
1238 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1239 {
1240 struct ixgb_context_desc *context_desc;
1241 unsigned int i;
1242 u8 css, cso;
1243
1244 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1245 struct ixgb_buffer *buffer_info;
1246 css = skb_transport_offset(skb);
1247 cso = css + skb->csum_offset;
1248
1249 i = adapter->tx_ring.next_to_use;
1250 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1251 buffer_info = &adapter->tx_ring.buffer_info[i];
1252 WARN_ON(buffer_info->dma != 0);
1253
1254 context_desc->tucss = css;
1255 context_desc->tucso = cso;
1256 context_desc->tucse = 0;
1257 /* zero out any previously existing data in one instruction */
1258 *(u32 *)&(context_desc->ipcss) = 0;
1259 context_desc->status = 0;
1260 context_desc->hdr_len = 0;
1261 context_desc->mss = 0;
1262 context_desc->cmd_type_len =
1263 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1264 | IXGB_TX_DESC_CMD_IDE);
1265
1266 if (++i == adapter->tx_ring.count) i = 0;
1267 adapter->tx_ring.next_to_use = i;
1268
1269 return true;
1270 }
1271
1272 return false;
1273 }
1274
1275 #define IXGB_MAX_TXD_PWR 14
1276 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1277
1278 static int
1279 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1280 unsigned int first)
1281 {
1282 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1283 struct pci_dev *pdev = adapter->pdev;
1284 struct ixgb_buffer *buffer_info;
1285 int len = skb_headlen(skb);
1286 unsigned int offset = 0, size, count = 0, i;
1287 unsigned int mss = skb_shinfo(skb)->gso_size;
1288 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1289 unsigned int f;
1290
1291 i = tx_ring->next_to_use;
1292
1293 while (len) {
1294 buffer_info = &tx_ring->buffer_info[i];
1295 size = min(len, IXGB_MAX_DATA_PER_TXD);
1296 /* Workaround for premature desc write-backs
1297 * in TSO mode. Append 4-byte sentinel desc */
1298 if (unlikely(mss && !nr_frags && size == len && size > 8))
1299 size -= 4;
1300
1301 buffer_info->length = size;
1302 WARN_ON(buffer_info->dma != 0);
1303 buffer_info->time_stamp = jiffies;
1304 buffer_info->mapped_as_page = false;
1305 buffer_info->dma = pci_map_single(pdev, skb->data + offset,
1306 size, PCI_DMA_TODEVICE);
1307 if (pci_dma_mapping_error(pdev, buffer_info->dma))
1308 goto dma_error;
1309 buffer_info->next_to_watch = 0;
1310
1311 len -= size;
1312 offset += size;
1313 count++;
1314 if (len) {
1315 i++;
1316 if (i == tx_ring->count)
1317 i = 0;
1318 }
1319 }
1320
1321 for (f = 0; f < nr_frags; f++) {
1322 struct skb_frag_struct *frag;
1323
1324 frag = &skb_shinfo(skb)->frags[f];
1325 len = frag->size;
1326 offset = frag->page_offset;
1327
1328 while (len) {
1329 i++;
1330 if (i == tx_ring->count)
1331 i = 0;
1332
1333 buffer_info = &tx_ring->buffer_info[i];
1334 size = min(len, IXGB_MAX_DATA_PER_TXD);
1335
1336 /* Workaround for premature desc write-backs
1337 * in TSO mode. Append 4-byte sentinel desc */
1338 if (unlikely(mss && (f == (nr_frags - 1))
1339 && size == len && size > 8))
1340 size -= 4;
1341
1342 buffer_info->length = size;
1343 buffer_info->time_stamp = jiffies;
1344 buffer_info->mapped_as_page = true;
1345 buffer_info->dma =
1346 pci_map_page(pdev, frag->page,
1347 offset, size,
1348 PCI_DMA_TODEVICE);
1349 if (pci_dma_mapping_error(pdev, buffer_info->dma))
1350 goto dma_error;
1351 buffer_info->next_to_watch = 0;
1352
1353 len -= size;
1354 offset += size;
1355 count++;
1356 }
1357 }
1358 tx_ring->buffer_info[i].skb = skb;
1359 tx_ring->buffer_info[first].next_to_watch = i;
1360
1361 return count;
1362
1363 dma_error:
1364 dev_err(&pdev->dev, "TX DMA map failed\n");
1365 buffer_info->dma = 0;
1366 count--;
1367
1368 while (count >= 0) {
1369 count--;
1370 i--;
1371 if (i < 0)
1372 i += tx_ring->count;
1373 buffer_info = &tx_ring->buffer_info[i];
1374 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1375 }
1376
1377 return 0;
1378 }
1379
1380 static void
1381 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1382 {
1383 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1384 struct ixgb_tx_desc *tx_desc = NULL;
1385 struct ixgb_buffer *buffer_info;
1386 u32 cmd_type_len = adapter->tx_cmd_type;
1387 u8 status = 0;
1388 u8 popts = 0;
1389 unsigned int i;
1390
1391 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1392 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1393 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1394 }
1395
1396 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1397 popts |= IXGB_TX_DESC_POPTS_TXSM;
1398
1399 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1400 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1401
1402 i = tx_ring->next_to_use;
1403
1404 while (count--) {
1405 buffer_info = &tx_ring->buffer_info[i];
1406 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1407 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1408 tx_desc->cmd_type_len =
1409 cpu_to_le32(cmd_type_len | buffer_info->length);
1410 tx_desc->status = status;
1411 tx_desc->popts = popts;
1412 tx_desc->vlan = cpu_to_le16(vlan_id);
1413
1414 if (++i == tx_ring->count) i = 0;
1415 }
1416
1417 tx_desc->cmd_type_len |=
1418 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1419
1420 /* Force memory writes to complete before letting h/w
1421 * know there are new descriptors to fetch. (Only
1422 * applicable for weak-ordered memory model archs,
1423 * such as IA-64). */
1424 wmb();
1425
1426 tx_ring->next_to_use = i;
1427 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1428 }
1429
1430 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1431 {
1432 struct ixgb_adapter *adapter = netdev_priv(netdev);
1433 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1434
1435 netif_stop_queue(netdev);
1436 /* Herbert's original patch had:
1437 * smp_mb__after_netif_stop_queue();
1438 * but since that doesn't exist yet, just open code it. */
1439 smp_mb();
1440
1441 /* We need to check again in a case another CPU has just
1442 * made room available. */
1443 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1444 return -EBUSY;
1445
1446 /* A reprieve! */
1447 netif_start_queue(netdev);
1448 ++adapter->restart_queue;
1449 return 0;
1450 }
1451
1452 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1453 struct ixgb_desc_ring *tx_ring, int size)
1454 {
1455 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1456 return 0;
1457 return __ixgb_maybe_stop_tx(netdev, size);
1458 }
1459
1460
1461 /* Tx Descriptors needed, worst case */
1462 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1463 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1464 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1465 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1466 + 1 /* one more needed for sentinel TSO workaround */
1467
1468 static netdev_tx_t
1469 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1470 {
1471 struct ixgb_adapter *adapter = netdev_priv(netdev);
1472 unsigned int first;
1473 unsigned int tx_flags = 0;
1474 int vlan_id = 0;
1475 int count = 0;
1476 int tso;
1477
1478 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1479 dev_kfree_skb(skb);
1480 return NETDEV_TX_OK;
1481 }
1482
1483 if (skb->len <= 0) {
1484 dev_kfree_skb(skb);
1485 return NETDEV_TX_OK;
1486 }
1487
1488 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1489 DESC_NEEDED)))
1490 return NETDEV_TX_BUSY;
1491
1492 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1493 tx_flags |= IXGB_TX_FLAGS_VLAN;
1494 vlan_id = vlan_tx_tag_get(skb);
1495 }
1496
1497 first = adapter->tx_ring.next_to_use;
1498
1499 tso = ixgb_tso(adapter, skb);
1500 if (tso < 0) {
1501 dev_kfree_skb(skb);
1502 return NETDEV_TX_OK;
1503 }
1504
1505 if (likely(tso))
1506 tx_flags |= IXGB_TX_FLAGS_TSO;
1507 else if (ixgb_tx_csum(adapter, skb))
1508 tx_flags |= IXGB_TX_FLAGS_CSUM;
1509
1510 count = ixgb_tx_map(adapter, skb, first);
1511
1512 if (count) {
1513 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1514 /* Make sure there is space in the ring for the next send. */
1515 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1516
1517 } else {
1518 dev_kfree_skb_any(skb);
1519 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1520 adapter->tx_ring.next_to_use = first;
1521 }
1522
1523 return NETDEV_TX_OK;
1524 }
1525
1526 /**
1527 * ixgb_tx_timeout - Respond to a Tx Hang
1528 * @netdev: network interface device structure
1529 **/
1530
1531 static void
1532 ixgb_tx_timeout(struct net_device *netdev)
1533 {
1534 struct ixgb_adapter *adapter = netdev_priv(netdev);
1535
1536 /* Do the reset outside of interrupt context */
1537 schedule_work(&adapter->tx_timeout_task);
1538 }
1539
1540 static void
1541 ixgb_tx_timeout_task(struct work_struct *work)
1542 {
1543 struct ixgb_adapter *adapter =
1544 container_of(work, struct ixgb_adapter, tx_timeout_task);
1545
1546 adapter->tx_timeout_count++;
1547 ixgb_down(adapter, true);
1548 ixgb_up(adapter);
1549 }
1550
1551 /**
1552 * ixgb_get_stats - Get System Network Statistics
1553 * @netdev: network interface device structure
1554 *
1555 * Returns the address of the device statistics structure.
1556 * The statistics are actually updated from the timer callback.
1557 **/
1558
1559 static struct net_device_stats *
1560 ixgb_get_stats(struct net_device *netdev)
1561 {
1562 return &netdev->stats;
1563 }
1564
1565 /**
1566 * ixgb_change_mtu - Change the Maximum Transfer Unit
1567 * @netdev: network interface device structure
1568 * @new_mtu: new value for maximum frame size
1569 *
1570 * Returns 0 on success, negative on failure
1571 **/
1572
1573 static int
1574 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1575 {
1576 struct ixgb_adapter *adapter = netdev_priv(netdev);
1577 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1578 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1579
1580 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1581 if ((new_mtu < 68) ||
1582 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1583 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1584 return -EINVAL;
1585 }
1586
1587 if (old_max_frame == max_frame)
1588 return 0;
1589
1590 if (netif_running(netdev))
1591 ixgb_down(adapter, true);
1592
1593 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1594
1595 netdev->mtu = new_mtu;
1596
1597 if (netif_running(netdev))
1598 ixgb_up(adapter);
1599
1600 return 0;
1601 }
1602
1603 /**
1604 * ixgb_update_stats - Update the board statistics counters.
1605 * @adapter: board private structure
1606 **/
1607
1608 void
1609 ixgb_update_stats(struct ixgb_adapter *adapter)
1610 {
1611 struct net_device *netdev = adapter->netdev;
1612 struct pci_dev *pdev = adapter->pdev;
1613
1614 /* Prevent stats update while adapter is being reset */
1615 if (pci_channel_offline(pdev))
1616 return;
1617
1618 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1619 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1620 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1621 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1622 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1623 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1624
1625 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1626 /* fix up multicast stats by removing broadcasts */
1627 if (multi >= bcast)
1628 multi -= bcast;
1629
1630 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1631 adapter->stats.mprch += (multi >> 32);
1632 adapter->stats.bprcl += bcast_l;
1633 adapter->stats.bprch += bcast_h;
1634 } else {
1635 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1636 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1637 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1638 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1639 }
1640 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1641 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1642 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1643 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1644 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1645 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1646 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1647 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1648 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1649 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1650 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1651 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1652 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1653 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1654 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1655 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1656 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1657 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1658 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1659 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1660 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1661 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1662 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1663 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1664 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1665 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1666 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1667 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1668 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1669 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1670 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1671 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1672 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1673 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1674 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1675 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1676 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1677 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1678 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1679 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1680 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1681 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1682 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1683 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1684 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1685 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1686 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1687 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1688 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1689 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1690 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1691 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1692 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1693 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1694 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1695 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1696
1697 /* Fill out the OS statistics structure */
1698
1699 netdev->stats.rx_packets = adapter->stats.gprcl;
1700 netdev->stats.tx_packets = adapter->stats.gptcl;
1701 netdev->stats.rx_bytes = adapter->stats.gorcl;
1702 netdev->stats.tx_bytes = adapter->stats.gotcl;
1703 netdev->stats.multicast = adapter->stats.mprcl;
1704 netdev->stats.collisions = 0;
1705
1706 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1707 * with a length in the type/len field */
1708 netdev->stats.rx_errors =
1709 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1710 adapter->stats.ruc +
1711 adapter->stats.roc /*+ adapter->stats.rlec */ +
1712 adapter->stats.icbc +
1713 adapter->stats.ecbc + adapter->stats.mpc;
1714
1715 /* see above
1716 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1717 */
1718
1719 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1720 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1721 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1722 netdev->stats.rx_over_errors = adapter->stats.mpc;
1723
1724 netdev->stats.tx_errors = 0;
1725 netdev->stats.rx_frame_errors = 0;
1726 netdev->stats.tx_aborted_errors = 0;
1727 netdev->stats.tx_carrier_errors = 0;
1728 netdev->stats.tx_fifo_errors = 0;
1729 netdev->stats.tx_heartbeat_errors = 0;
1730 netdev->stats.tx_window_errors = 0;
1731 }
1732
1733 #define IXGB_MAX_INTR 10
1734 /**
1735 * ixgb_intr - Interrupt Handler
1736 * @irq: interrupt number
1737 * @data: pointer to a network interface device structure
1738 **/
1739
1740 static irqreturn_t
1741 ixgb_intr(int irq, void *data)
1742 {
1743 struct net_device *netdev = data;
1744 struct ixgb_adapter *adapter = netdev_priv(netdev);
1745 struct ixgb_hw *hw = &adapter->hw;
1746 u32 icr = IXGB_READ_REG(hw, ICR);
1747
1748 if (unlikely(!icr))
1749 return IRQ_NONE; /* Not our interrupt */
1750
1751 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1752 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1753 mod_timer(&adapter->watchdog_timer, jiffies);
1754
1755 if (napi_schedule_prep(&adapter->napi)) {
1756
1757 /* Disable interrupts and register for poll. The flush
1758 of the posted write is intentionally left out.
1759 */
1760
1761 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1762 __napi_schedule(&adapter->napi);
1763 }
1764 return IRQ_HANDLED;
1765 }
1766
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 int work_done = 0;
1777
1778 ixgb_clean_tx_irq(adapter);
1779 ixgb_clean_rx_irq(adapter, &work_done, budget);
1780
1781 /* If budget not fully consumed, exit the polling mode */
1782 if (work_done < budget) {
1783 napi_complete(napi);
1784 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1785 ixgb_irq_enable(adapter);
1786 }
1787
1788 return work_done;
1789 }
1790
1791 /**
1792 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1793 * @adapter: board private structure
1794 **/
1795
1796 static bool
1797 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1798 {
1799 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1800 struct net_device *netdev = adapter->netdev;
1801 struct ixgb_tx_desc *tx_desc, *eop_desc;
1802 struct ixgb_buffer *buffer_info;
1803 unsigned int i, eop;
1804 bool cleaned = false;
1805
1806 i = tx_ring->next_to_clean;
1807 eop = tx_ring->buffer_info[i].next_to_watch;
1808 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1809
1810 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1811
1812 for (cleaned = false; !cleaned; ) {
1813 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1814 buffer_info = &tx_ring->buffer_info[i];
1815
1816 if (tx_desc->popts &
1817 (IXGB_TX_DESC_POPTS_TXSM |
1818 IXGB_TX_DESC_POPTS_IXSM))
1819 adapter->hw_csum_tx_good++;
1820
1821 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1822
1823 *(u32 *)&(tx_desc->status) = 0;
1824
1825 cleaned = (i == eop);
1826 if (++i == tx_ring->count) i = 0;
1827 }
1828
1829 eop = tx_ring->buffer_info[i].next_to_watch;
1830 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1831 }
1832
1833 tx_ring->next_to_clean = i;
1834
1835 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1836 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1837 /* Make sure that anybody stopping the queue after this
1838 * sees the new next_to_clean. */
1839 smp_mb();
1840
1841 if (netif_queue_stopped(netdev) &&
1842 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1843 netif_wake_queue(netdev);
1844 ++adapter->restart_queue;
1845 }
1846 }
1847
1848 if (adapter->detect_tx_hung) {
1849 /* detect a transmit hang in hardware, this serializes the
1850 * check with the clearing of time_stamp and movement of i */
1851 adapter->detect_tx_hung = false;
1852 if (tx_ring->buffer_info[eop].time_stamp &&
1853 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1854 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1855 IXGB_STATUS_TXOFF)) {
1856 /* detected Tx unit hang */
1857 DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1858 " TDH <%x>\n"
1859 " TDT <%x>\n"
1860 " next_to_use <%x>\n"
1861 " next_to_clean <%x>\n"
1862 "buffer_info[next_to_clean]\n"
1863 " time_stamp <%lx>\n"
1864 " next_to_watch <%x>\n"
1865 " jiffies <%lx>\n"
1866 " next_to_watch.status <%x>\n",
1867 IXGB_READ_REG(&adapter->hw, TDH),
1868 IXGB_READ_REG(&adapter->hw, TDT),
1869 tx_ring->next_to_use,
1870 tx_ring->next_to_clean,
1871 tx_ring->buffer_info[eop].time_stamp,
1872 eop,
1873 jiffies,
1874 eop_desc->status);
1875 netif_stop_queue(netdev);
1876 }
1877 }
1878
1879 return cleaned;
1880 }
1881
1882 /**
1883 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1884 * @adapter: board private structure
1885 * @rx_desc: receive descriptor
1886 * @sk_buff: socket buffer with received data
1887 **/
1888
1889 static void
1890 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1891 struct ixgb_rx_desc *rx_desc,
1892 struct sk_buff *skb)
1893 {
1894 /* Ignore Checksum bit is set OR
1895 * TCP Checksum has not been calculated
1896 */
1897 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1898 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1899 skb->ip_summed = CHECKSUM_NONE;
1900 return;
1901 }
1902
1903 /* At this point we know the hardware did the TCP checksum */
1904 /* now look at the TCP checksum error bit */
1905 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1906 /* let the stack verify checksum errors */
1907 skb->ip_summed = CHECKSUM_NONE;
1908 adapter->hw_csum_rx_error++;
1909 } else {
1910 /* TCP checksum is good */
1911 skb->ip_summed = CHECKSUM_UNNECESSARY;
1912 adapter->hw_csum_rx_good++;
1913 }
1914 }
1915
1916 /**
1917 * ixgb_clean_rx_irq - Send received data up the network stack,
1918 * @adapter: board private structure
1919 **/
1920
1921 static bool
1922 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1923 {
1924 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1925 struct net_device *netdev = adapter->netdev;
1926 struct pci_dev *pdev = adapter->pdev;
1927 struct ixgb_rx_desc *rx_desc, *next_rxd;
1928 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1929 u32 length;
1930 unsigned int i, j;
1931 int cleaned_count = 0;
1932 bool cleaned = false;
1933
1934 i = rx_ring->next_to_clean;
1935 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1936 buffer_info = &rx_ring->buffer_info[i];
1937
1938 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1939 struct sk_buff *skb;
1940 u8 status;
1941
1942 if (*work_done >= work_to_do)
1943 break;
1944
1945 (*work_done)++;
1946 status = rx_desc->status;
1947 skb = buffer_info->skb;
1948 buffer_info->skb = NULL;
1949
1950 prefetch(skb->data - NET_IP_ALIGN);
1951
1952 if (++i == rx_ring->count) i = 0;
1953 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1954 prefetch(next_rxd);
1955
1956 if ((j = i + 1) == rx_ring->count) j = 0;
1957 next2_buffer = &rx_ring->buffer_info[j];
1958 prefetch(next2_buffer);
1959
1960 next_buffer = &rx_ring->buffer_info[i];
1961
1962 cleaned = true;
1963 cleaned_count++;
1964
1965 pci_unmap_single(pdev,
1966 buffer_info->dma,
1967 buffer_info->length,
1968 PCI_DMA_FROMDEVICE);
1969 buffer_info->dma = 0;
1970
1971 length = le16_to_cpu(rx_desc->length);
1972 rx_desc->length = 0;
1973
1974 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1975
1976 /* All receives must fit into a single buffer */
1977
1978 IXGB_DBG("Receive packet consumed multiple buffers "
1979 "length<%x>\n", length);
1980
1981 dev_kfree_skb_irq(skb);
1982 goto rxdesc_done;
1983 }
1984
1985 if (unlikely(rx_desc->errors &
1986 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1987 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1988 dev_kfree_skb_irq(skb);
1989 goto rxdesc_done;
1990 }
1991
1992 /* code added for copybreak, this should improve
1993 * performance for small packets with large amounts
1994 * of reassembly being done in the stack */
1995 if (length < copybreak) {
1996 struct sk_buff *new_skb =
1997 netdev_alloc_skb_ip_align(netdev, length);
1998 if (new_skb) {
1999 skb_copy_to_linear_data_offset(new_skb,
2000 -NET_IP_ALIGN,
2001 (skb->data -
2002 NET_IP_ALIGN),
2003 (length +
2004 NET_IP_ALIGN));
2005 /* save the skb in buffer_info as good */
2006 buffer_info->skb = skb;
2007 skb = new_skb;
2008 }
2009 }
2010 /* end copybreak code */
2011
2012 /* Good Receive */
2013 skb_put(skb, length);
2014
2015 /* Receive Checksum Offload */
2016 ixgb_rx_checksum(adapter, rx_desc, skb);
2017
2018 skb->protocol = eth_type_trans(skb, netdev);
2019 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2020 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2021 le16_to_cpu(rx_desc->special));
2022 } else {
2023 netif_receive_skb(skb);
2024 }
2025
2026 rxdesc_done:
2027 /* clean up descriptor, might be written over by hw */
2028 rx_desc->status = 0;
2029
2030 /* return some buffers to hardware, one at a time is too slow */
2031 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2032 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2033 cleaned_count = 0;
2034 }
2035
2036 /* use prefetched values */
2037 rx_desc = next_rxd;
2038 buffer_info = next_buffer;
2039 }
2040
2041 rx_ring->next_to_clean = i;
2042
2043 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2044 if (cleaned_count)
2045 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2046
2047 return cleaned;
2048 }
2049
2050 /**
2051 * ixgb_alloc_rx_buffers - Replace used receive buffers
2052 * @adapter: address of board private structure
2053 **/
2054
2055 static void
2056 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2057 {
2058 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2059 struct net_device *netdev = adapter->netdev;
2060 struct pci_dev *pdev = adapter->pdev;
2061 struct ixgb_rx_desc *rx_desc;
2062 struct ixgb_buffer *buffer_info;
2063 struct sk_buff *skb;
2064 unsigned int i;
2065 long cleancount;
2066
2067 i = rx_ring->next_to_use;
2068 buffer_info = &rx_ring->buffer_info[i];
2069 cleancount = IXGB_DESC_UNUSED(rx_ring);
2070
2071
2072 /* leave three descriptors unused */
2073 while (--cleancount > 2 && cleaned_count--) {
2074 /* recycle! its good for you */
2075 skb = buffer_info->skb;
2076 if (skb) {
2077 skb_trim(skb, 0);
2078 goto map_skb;
2079 }
2080
2081 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2082 if (unlikely(!skb)) {
2083 /* Better luck next round */
2084 adapter->alloc_rx_buff_failed++;
2085 break;
2086 }
2087
2088 buffer_info->skb = skb;
2089 buffer_info->length = adapter->rx_buffer_len;
2090 map_skb:
2091 buffer_info->dma = pci_map_single(pdev,
2092 skb->data,
2093 adapter->rx_buffer_len,
2094 PCI_DMA_FROMDEVICE);
2095
2096 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2097 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2098 /* guarantee DD bit not set now before h/w gets descriptor
2099 * this is the rest of the workaround for h/w double
2100 * writeback. */
2101 rx_desc->status = 0;
2102
2103
2104 if (++i == rx_ring->count) i = 0;
2105 buffer_info = &rx_ring->buffer_info[i];
2106 }
2107
2108 if (likely(rx_ring->next_to_use != i)) {
2109 rx_ring->next_to_use = i;
2110 if (unlikely(i-- == 0))
2111 i = (rx_ring->count - 1);
2112
2113 /* Force memory writes to complete before letting h/w
2114 * know there are new descriptors to fetch. (Only
2115 * applicable for weak-ordered memory model archs, such
2116 * as IA-64). */
2117 wmb();
2118 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2119 }
2120 }
2121
2122 /**
2123 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2124 *
2125 * @param netdev network interface device structure
2126 * @param grp indicates to enable or disable tagging/stripping
2127 **/
2128 static void
2129 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2130 {
2131 struct ixgb_adapter *adapter = netdev_priv(netdev);
2132 u32 ctrl, rctl;
2133
2134 ixgb_irq_disable(adapter);
2135 adapter->vlgrp = grp;
2136
2137 if (grp) {
2138 /* enable VLAN tag insert/strip */
2139 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140 ctrl |= IXGB_CTRL0_VME;
2141 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142
2143 /* enable VLAN receive filtering */
2144
2145 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2146 rctl &= ~IXGB_RCTL_CFIEN;
2147 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2148 } else {
2149 /* disable VLAN tag insert/strip */
2150
2151 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2152 ctrl &= ~IXGB_CTRL0_VME;
2153 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2154 }
2155
2156 /* don't enable interrupts unless we are UP */
2157 if (adapter->netdev->flags & IFF_UP)
2158 ixgb_irq_enable(adapter);
2159 }
2160
2161 static void
2162 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2163 {
2164 struct ixgb_adapter *adapter = netdev_priv(netdev);
2165 u32 vfta, index;
2166
2167 /* add VID to filter table */
2168
2169 index = (vid >> 5) & 0x7F;
2170 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2171 vfta |= (1 << (vid & 0x1F));
2172 ixgb_write_vfta(&adapter->hw, index, vfta);
2173 }
2174
2175 static void
2176 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2177 {
2178 struct ixgb_adapter *adapter = netdev_priv(netdev);
2179 u32 vfta, index;
2180
2181 ixgb_irq_disable(adapter);
2182
2183 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2184
2185 /* don't enable interrupts unless we are UP */
2186 if (adapter->netdev->flags & IFF_UP)
2187 ixgb_irq_enable(adapter);
2188
2189 /* remove VID from filter table */
2190
2191 index = (vid >> 5) & 0x7F;
2192 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2193 vfta &= ~(1 << (vid & 0x1F));
2194 ixgb_write_vfta(&adapter->hw, index, vfta);
2195 }
2196
2197 static void
2198 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2199 {
2200 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2201
2202 if (adapter->vlgrp) {
2203 u16 vid;
2204 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2205 if (!vlan_group_get_device(adapter->vlgrp, vid))
2206 continue;
2207 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2208 }
2209 }
2210 }
2211
2212 #ifdef CONFIG_NET_POLL_CONTROLLER
2213 /*
2214 * Polling 'interrupt' - used by things like netconsole to send skbs
2215 * without having to re-enable interrupts. It's not called while
2216 * the interrupt routine is executing.
2217 */
2218
2219 static void ixgb_netpoll(struct net_device *dev)
2220 {
2221 struct ixgb_adapter *adapter = netdev_priv(dev);
2222
2223 disable_irq(adapter->pdev->irq);
2224 ixgb_intr(adapter->pdev->irq, dev);
2225 enable_irq(adapter->pdev->irq);
2226 }
2227 #endif
2228
2229 /**
2230 * ixgb_io_error_detected() - called when PCI error is detected
2231 * @pdev pointer to pci device with error
2232 * @state pci channel state after error
2233 *
2234 * This callback is called by the PCI subsystem whenever
2235 * a PCI bus error is detected.
2236 */
2237 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2238 enum pci_channel_state state)
2239 {
2240 struct net_device *netdev = pci_get_drvdata(pdev);
2241 struct ixgb_adapter *adapter = netdev_priv(netdev);
2242
2243 netif_device_detach(netdev);
2244
2245 if (state == pci_channel_io_perm_failure)
2246 return PCI_ERS_RESULT_DISCONNECT;
2247
2248 if (netif_running(netdev))
2249 ixgb_down(adapter, true);
2250
2251 pci_disable_device(pdev);
2252
2253 /* Request a slot reset. */
2254 return PCI_ERS_RESULT_NEED_RESET;
2255 }
2256
2257 /**
2258 * ixgb_io_slot_reset - called after the pci bus has been reset.
2259 * @pdev pointer to pci device with error
2260 *
2261 * This callback is called after the PCI bus has been reset.
2262 * Basically, this tries to restart the card from scratch.
2263 * This is a shortened version of the device probe/discovery code,
2264 * it resembles the first-half of the ixgb_probe() routine.
2265 */
2266 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2267 {
2268 struct net_device *netdev = pci_get_drvdata(pdev);
2269 struct ixgb_adapter *adapter = netdev_priv(netdev);
2270
2271 if (pci_enable_device(pdev)) {
2272 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2273 return PCI_ERS_RESULT_DISCONNECT;
2274 }
2275
2276 /* Perform card reset only on one instance of the card */
2277 if (0 != PCI_FUNC (pdev->devfn))
2278 return PCI_ERS_RESULT_RECOVERED;
2279
2280 pci_set_master(pdev);
2281
2282 netif_carrier_off(netdev);
2283 netif_stop_queue(netdev);
2284 ixgb_reset(adapter);
2285
2286 /* Make sure the EEPROM is good */
2287 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2288 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2289 return PCI_ERS_RESULT_DISCONNECT;
2290 }
2291 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2292 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2293
2294 if (!is_valid_ether_addr(netdev->perm_addr)) {
2295 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2296 return PCI_ERS_RESULT_DISCONNECT;
2297 }
2298
2299 return PCI_ERS_RESULT_RECOVERED;
2300 }
2301
2302 /**
2303 * ixgb_io_resume - called when its OK to resume normal operations
2304 * @pdev pointer to pci device with error
2305 *
2306 * The error recovery driver tells us that its OK to resume
2307 * normal operation. Implementation resembles the second-half
2308 * of the ixgb_probe() routine.
2309 */
2310 static void ixgb_io_resume(struct pci_dev *pdev)
2311 {
2312 struct net_device *netdev = pci_get_drvdata(pdev);
2313 struct ixgb_adapter *adapter = netdev_priv(netdev);
2314
2315 pci_set_master(pdev);
2316
2317 if (netif_running(netdev)) {
2318 if (ixgb_up(adapter)) {
2319 printk ("ixgb: can't bring device back up after reset\n");
2320 return;
2321 }
2322 }
2323
2324 netif_device_attach(netdev);
2325 mod_timer(&adapter->watchdog_timer, jiffies);
2326 }
2327
2328 /* ixgb_main.c */
Linux kernel - Deliverables
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