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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 netif_err(adapter, probe, adapter->netdev,
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 netif_err(adapter, probe, adapter->netdev, "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 netif_err(adapter, probe, adapter->netdev,
451 "The EEPROM Checksum Is Not Valid\n");
452 err = -EIO;
453 goto err_eeprom;
454 }
455
456 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
457 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
458
459 if (!is_valid_ether_addr(netdev->perm_addr)) {
460 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
461 err = -EIO;
462 goto err_eeprom;
463 }
464
465 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
466
467 init_timer(&adapter->watchdog_timer);
468 adapter->watchdog_timer.function = &ixgb_watchdog;
469 adapter->watchdog_timer.data = (unsigned long)adapter;
470
471 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
472
473 strcpy(netdev->name, "eth%d");
474 err = register_netdev(netdev);
475 if (err)
476 goto err_register;
477
478 /* carrier off reporting is important to ethtool even BEFORE open */
479 netif_carrier_off(netdev);
480
481 netif_info(adapter, probe, adapter->netdev,
482 "Intel(R) PRO/10GbE Network Connection\n");
483 ixgb_check_options(adapter);
484 /* reset the hardware with the new settings */
485
486 ixgb_reset(adapter);
487
488 cards_found++;
489 return 0;
490
491 err_register:
492 err_sw_init:
493 err_eeprom:
494 iounmap(adapter->hw.hw_addr);
495 err_ioremap:
496 free_netdev(netdev);
497 err_alloc_etherdev:
498 pci_release_regions(pdev);
499 err_request_regions:
500 err_dma_mask:
501 pci_disable_device(pdev);
502 return err;
503 }
504
505 /**
506 * ixgb_remove - Device Removal Routine
507 * @pdev: PCI device information struct
508 *
509 * ixgb_remove is called by the PCI subsystem to alert the driver
510 * that it should release a PCI device. The could be caused by a
511 * Hot-Plug event, or because the driver is going to be removed from
512 * memory.
513 **/
514
515 static void __devexit
516 ixgb_remove(struct pci_dev *pdev)
517 {
518 struct net_device *netdev = pci_get_drvdata(pdev);
519 struct ixgb_adapter *adapter = netdev_priv(netdev);
520
521 flush_scheduled_work();
522
523 unregister_netdev(netdev);
524
525 iounmap(adapter->hw.hw_addr);
526 pci_release_regions(pdev);
527
528 free_netdev(netdev);
529 }
530
531 /**
532 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
533 * @adapter: board private structure to initialize
534 *
535 * ixgb_sw_init initializes the Adapter private data structure.
536 * Fields are initialized based on PCI device information and
537 * OS network device settings (MTU size).
538 **/
539
540 static int __devinit
541 ixgb_sw_init(struct ixgb_adapter *adapter)
542 {
543 struct ixgb_hw *hw = &adapter->hw;
544 struct net_device *netdev = adapter->netdev;
545 struct pci_dev *pdev = adapter->pdev;
546
547 /* PCI config space info */
548
549 hw->vendor_id = pdev->vendor;
550 hw->device_id = pdev->device;
551 hw->subsystem_vendor_id = pdev->subsystem_vendor;
552 hw->subsystem_id = pdev->subsystem_device;
553
554 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
555 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
556
557 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
558 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
559 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
560 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
561 hw->mac_type = ixgb_82597;
562 else {
563 /* should never have loaded on this device */
564 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
565 }
566
567 /* enable flow control to be programmed */
568 hw->fc.send_xon = 1;
569
570 set_bit(__IXGB_DOWN, &adapter->flags);
571 return 0;
572 }
573
574 /**
575 * ixgb_open - Called when a network interface is made active
576 * @netdev: network interface device structure
577 *
578 * Returns 0 on success, negative value on failure
579 *
580 * The open entry point is called when a network interface is made
581 * active by the system (IFF_UP). At this point all resources needed
582 * for transmit and receive operations are allocated, the interrupt
583 * handler is registered with the OS, the watchdog timer is started,
584 * and the stack is notified that the interface is ready.
585 **/
586
587 static int
588 ixgb_open(struct net_device *netdev)
589 {
590 struct ixgb_adapter *adapter = netdev_priv(netdev);
591 int err;
592
593 /* allocate transmit descriptors */
594 err = ixgb_setup_tx_resources(adapter);
595 if (err)
596 goto err_setup_tx;
597
598 netif_carrier_off(netdev);
599
600 /* allocate receive descriptors */
601
602 err = ixgb_setup_rx_resources(adapter);
603 if (err)
604 goto err_setup_rx;
605
606 err = ixgb_up(adapter);
607 if (err)
608 goto err_up;
609
610 netif_start_queue(netdev);
611
612 return 0;
613
614 err_up:
615 ixgb_free_rx_resources(adapter);
616 err_setup_rx:
617 ixgb_free_tx_resources(adapter);
618 err_setup_tx:
619 ixgb_reset(adapter);
620
621 return err;
622 }
623
624 /**
625 * ixgb_close - Disables a network interface
626 * @netdev: network interface device structure
627 *
628 * Returns 0, this is not allowed to fail
629 *
630 * The close entry point is called when an interface is de-activated
631 * by the OS. The hardware is still under the drivers control, but
632 * needs to be disabled. A global MAC reset is issued to stop the
633 * hardware, and all transmit and receive resources are freed.
634 **/
635
636 static int
637 ixgb_close(struct net_device *netdev)
638 {
639 struct ixgb_adapter *adapter = netdev_priv(netdev);
640
641 ixgb_down(adapter, true);
642
643 ixgb_free_tx_resources(adapter);
644 ixgb_free_rx_resources(adapter);
645
646 return 0;
647 }
648
649 /**
650 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
651 * @adapter: board private structure
652 *
653 * Return 0 on success, negative on failure
654 **/
655
656 int
657 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
658 {
659 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
660 struct pci_dev *pdev = adapter->pdev;
661 int size;
662
663 size = sizeof(struct ixgb_buffer) * txdr->count;
664 txdr->buffer_info = vmalloc(size);
665 if (!txdr->buffer_info) {
666 netif_err(adapter, probe, adapter->netdev,
667 "Unable to allocate transmit descriptor ring memory\n");
668 return -ENOMEM;
669 }
670 memset(txdr->buffer_info, 0, size);
671
672 /* round up to nearest 4K */
673
674 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
675 txdr->size = ALIGN(txdr->size, 4096);
676
677 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
678 if (!txdr->desc) {
679 vfree(txdr->buffer_info);
680 netif_err(adapter, probe, adapter->netdev,
681 "Unable to allocate transmit descriptor memory\n");
682 return -ENOMEM;
683 }
684 memset(txdr->desc, 0, txdr->size);
685
686 txdr->next_to_use = 0;
687 txdr->next_to_clean = 0;
688
689 return 0;
690 }
691
692 /**
693 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
694 * @adapter: board private structure
695 *
696 * Configure the Tx unit of the MAC after a reset.
697 **/
698
699 static void
700 ixgb_configure_tx(struct ixgb_adapter *adapter)
701 {
702 u64 tdba = adapter->tx_ring.dma;
703 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
704 u32 tctl;
705 struct ixgb_hw *hw = &adapter->hw;
706
707 /* Setup the Base and Length of the Tx Descriptor Ring
708 * tx_ring.dma can be either a 32 or 64 bit value
709 */
710
711 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
712 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
713
714 IXGB_WRITE_REG(hw, TDLEN, tdlen);
715
716 /* Setup the HW Tx Head and Tail descriptor pointers */
717
718 IXGB_WRITE_REG(hw, TDH, 0);
719 IXGB_WRITE_REG(hw, TDT, 0);
720
721 /* don't set up txdctl, it induces performance problems if configured
722 * incorrectly */
723 /* Set the Tx Interrupt Delay register */
724
725 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
726
727 /* Program the Transmit Control Register */
728
729 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
730 IXGB_WRITE_REG(hw, TCTL, tctl);
731
732 /* Setup Transmit Descriptor Settings for this adapter */
733 adapter->tx_cmd_type =
734 IXGB_TX_DESC_TYPE |
735 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
736 }
737
738 /**
739 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
740 * @adapter: board private structure
741 *
742 * Returns 0 on success, negative on failure
743 **/
744
745 int
746 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
747 {
748 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
749 struct pci_dev *pdev = adapter->pdev;
750 int size;
751
752 size = sizeof(struct ixgb_buffer) * rxdr->count;
753 rxdr->buffer_info = vmalloc(size);
754 if (!rxdr->buffer_info) {
755 netif_err(adapter, probe, adapter->netdev,
756 "Unable to allocate receive descriptor ring\n");
757 return -ENOMEM;
758 }
759 memset(rxdr->buffer_info, 0, size);
760
761 /* Round up to nearest 4K */
762
763 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
764 rxdr->size = ALIGN(rxdr->size, 4096);
765
766 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
767
768 if (!rxdr->desc) {
769 vfree(rxdr->buffer_info);
770 netif_err(adapter, probe, adapter->netdev,
771 "Unable to allocate receive descriptors\n");
772 return -ENOMEM;
773 }
774 memset(rxdr->desc, 0, rxdr->size);
775
776 rxdr->next_to_clean = 0;
777 rxdr->next_to_use = 0;
778
779 return 0;
780 }
781
782 /**
783 * ixgb_setup_rctl - configure the receive control register
784 * @adapter: Board private structure
785 **/
786
787 static void
788 ixgb_setup_rctl(struct ixgb_adapter *adapter)
789 {
790 u32 rctl;
791
792 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
793
794 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
795
796 rctl |=
797 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
798 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
799 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
800
801 rctl |= IXGB_RCTL_SECRC;
802
803 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
804 rctl |= IXGB_RCTL_BSIZE_2048;
805 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
806 rctl |= IXGB_RCTL_BSIZE_4096;
807 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
808 rctl |= IXGB_RCTL_BSIZE_8192;
809 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
810 rctl |= IXGB_RCTL_BSIZE_16384;
811
812 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
813 }
814
815 /**
816 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
817 * @adapter: board private structure
818 *
819 * Configure the Rx unit of the MAC after a reset.
820 **/
821
822 static void
823 ixgb_configure_rx(struct ixgb_adapter *adapter)
824 {
825 u64 rdba = adapter->rx_ring.dma;
826 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
827 struct ixgb_hw *hw = &adapter->hw;
828 u32 rctl;
829 u32 rxcsum;
830
831 /* make sure receives are disabled while setting up the descriptors */
832
833 rctl = IXGB_READ_REG(hw, RCTL);
834 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
835
836 /* set the Receive Delay Timer Register */
837
838 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
839
840 /* Setup the Base and Length of the Rx Descriptor Ring */
841
842 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
843 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
844
845 IXGB_WRITE_REG(hw, RDLEN, rdlen);
846
847 /* Setup the HW Rx Head and Tail Descriptor Pointers */
848 IXGB_WRITE_REG(hw, RDH, 0);
849 IXGB_WRITE_REG(hw, RDT, 0);
850
851 /* due to the hardware errata with RXDCTL, we are unable to use any of
852 * the performance enhancing features of it without causing other
853 * subtle bugs, some of the bugs could include receive length
854 * corruption at high data rates (WTHRESH > 0) and/or receive
855 * descriptor ring irregularites (particularly in hardware cache) */
856 IXGB_WRITE_REG(hw, RXDCTL, 0);
857
858 /* Enable Receive Checksum Offload for TCP and UDP */
859 if (adapter->rx_csum) {
860 rxcsum = IXGB_READ_REG(hw, RXCSUM);
861 rxcsum |= IXGB_RXCSUM_TUOFL;
862 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
863 }
864
865 /* Enable Receives */
866
867 IXGB_WRITE_REG(hw, RCTL, rctl);
868 }
869
870 /**
871 * ixgb_free_tx_resources - Free Tx Resources
872 * @adapter: board private structure
873 *
874 * Free all transmit software resources
875 **/
876
877 void
878 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
879 {
880 struct pci_dev *pdev = adapter->pdev;
881
882 ixgb_clean_tx_ring(adapter);
883
884 vfree(adapter->tx_ring.buffer_info);
885 adapter->tx_ring.buffer_info = NULL;
886
887 pci_free_consistent(pdev, adapter->tx_ring.size,
888 adapter->tx_ring.desc, adapter->tx_ring.dma);
889
890 adapter->tx_ring.desc = NULL;
891 }
892
893 static void
894 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
895 struct ixgb_buffer *buffer_info)
896 {
897 if (buffer_info->dma) {
898 if (buffer_info->mapped_as_page)
899 pci_unmap_page(adapter->pdev, buffer_info->dma,
900 buffer_info->length, PCI_DMA_TODEVICE);
901 else
902 pci_unmap_single(adapter->pdev, buffer_info->dma,
903 buffer_info->length,
904 PCI_DMA_TODEVICE);
905 buffer_info->dma = 0;
906 }
907
908 if (buffer_info->skb) {
909 dev_kfree_skb_any(buffer_info->skb);
910 buffer_info->skb = NULL;
911 }
912 buffer_info->time_stamp = 0;
913 /* these fields must always be initialized in tx
914 * buffer_info->length = 0;
915 * buffer_info->next_to_watch = 0; */
916 }
917
918 /**
919 * ixgb_clean_tx_ring - Free Tx Buffers
920 * @adapter: board private structure
921 **/
922
923 static void
924 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
925 {
926 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
927 struct ixgb_buffer *buffer_info;
928 unsigned long size;
929 unsigned int i;
930
931 /* Free all the Tx ring sk_buffs */
932
933 for (i = 0; i < tx_ring->count; i++) {
934 buffer_info = &tx_ring->buffer_info[i];
935 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
936 }
937
938 size = sizeof(struct ixgb_buffer) * tx_ring->count;
939 memset(tx_ring->buffer_info, 0, size);
940
941 /* Zero out the descriptor ring */
942
943 memset(tx_ring->desc, 0, tx_ring->size);
944
945 tx_ring->next_to_use = 0;
946 tx_ring->next_to_clean = 0;
947
948 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
949 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
950 }
951
952 /**
953 * ixgb_free_rx_resources - Free Rx Resources
954 * @adapter: board private structure
955 *
956 * Free all receive software resources
957 **/
958
959 void
960 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
961 {
962 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
963 struct pci_dev *pdev = adapter->pdev;
964
965 ixgb_clean_rx_ring(adapter);
966
967 vfree(rx_ring->buffer_info);
968 rx_ring->buffer_info = NULL;
969
970 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
971
972 rx_ring->desc = NULL;
973 }
974
975 /**
976 * ixgb_clean_rx_ring - Free Rx Buffers
977 * @adapter: board private structure
978 **/
979
980 static void
981 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
982 {
983 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
984 struct ixgb_buffer *buffer_info;
985 struct pci_dev *pdev = adapter->pdev;
986 unsigned long size;
987 unsigned int i;
988
989 /* Free all the Rx ring sk_buffs */
990
991 for (i = 0; i < rx_ring->count; i++) {
992 buffer_info = &rx_ring->buffer_info[i];
993 if (buffer_info->dma) {
994 pci_unmap_single(pdev,
995 buffer_info->dma,
996 buffer_info->length,
997 PCI_DMA_FROMDEVICE);
998 buffer_info->dma = 0;
999 buffer_info->length = 0;
1000 }
1001
1002 if (buffer_info->skb) {
1003 dev_kfree_skb(buffer_info->skb);
1004 buffer_info->skb = NULL;
1005 }
1006 }
1007
1008 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1009 memset(rx_ring->buffer_info, 0, size);
1010
1011 /* Zero out the descriptor ring */
1012
1013 memset(rx_ring->desc, 0, rx_ring->size);
1014
1015 rx_ring->next_to_clean = 0;
1016 rx_ring->next_to_use = 0;
1017
1018 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1019 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1020 }
1021
1022 /**
1023 * ixgb_set_mac - Change the Ethernet Address of the NIC
1024 * @netdev: network interface device structure
1025 * @p: pointer to an address structure
1026 *
1027 * Returns 0 on success, negative on failure
1028 **/
1029
1030 static int
1031 ixgb_set_mac(struct net_device *netdev, void *p)
1032 {
1033 struct ixgb_adapter *adapter = netdev_priv(netdev);
1034 struct sockaddr *addr = p;
1035
1036 if (!is_valid_ether_addr(addr->sa_data))
1037 return -EADDRNOTAVAIL;
1038
1039 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1040
1041 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1042
1043 return 0;
1044 }
1045
1046 /**
1047 * ixgb_set_multi - Multicast and Promiscuous mode set
1048 * @netdev: network interface device structure
1049 *
1050 * The set_multi entry point is called whenever the multicast address
1051 * list or the network interface flags are updated. This routine is
1052 * responsible for configuring the hardware for proper multicast,
1053 * promiscuous mode, and all-multi behavior.
1054 **/
1055
1056 static void
1057 ixgb_set_multi(struct net_device *netdev)
1058 {
1059 struct ixgb_adapter *adapter = netdev_priv(netdev);
1060 struct ixgb_hw *hw = &adapter->hw;
1061 struct dev_mc_list *mc_ptr;
1062 u32 rctl;
1063 int i;
1064
1065 /* Check for Promiscuous and All Multicast modes */
1066
1067 rctl = IXGB_READ_REG(hw, RCTL);
1068
1069 if (netdev->flags & IFF_PROMISC) {
1070 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1071 rctl &= ~IXGB_RCTL_VFE;
1072 } else {
1073 if (netdev->flags & IFF_ALLMULTI) {
1074 rctl |= IXGB_RCTL_MPE;
1075 rctl &= ~IXGB_RCTL_UPE;
1076 } else {
1077 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1078 }
1079 rctl |= IXGB_RCTL_VFE;
1080 }
1081
1082 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1083 rctl |= IXGB_RCTL_MPE;
1084 IXGB_WRITE_REG(hw, RCTL, rctl);
1085 } else {
1086 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1087 IXGB_ETH_LENGTH_OF_ADDRESS];
1088
1089 IXGB_WRITE_REG(hw, RCTL, rctl);
1090
1091 for (i = 0, mc_ptr = netdev->mc_list;
1092 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(netdev), 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 printk(KERN_INFO "ixgb: %s NIC Link is Up 10 Gbps "
1123 "Full Duplex, Flow Control: %s\n",
1124 netdev->name,
1125 (adapter->hw.fc.type == ixgb_fc_full) ?
1126 "RX/TX" :
1127 ((adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1128 "RX" :
1129 ((adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1130 "TX" : "None")));
1131 adapter->link_speed = 10000;
1132 adapter->link_duplex = FULL_DUPLEX;
1133 netif_carrier_on(netdev);
1134 }
1135 } else {
1136 if (netif_carrier_ok(netdev)) {
1137 adapter->link_speed = 0;
1138 adapter->link_duplex = 0;
1139 printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1140 netdev->name);
1141 netif_carrier_off(netdev);
1142 }
1143 }
1144
1145 ixgb_update_stats(adapter);
1146
1147 if (!netif_carrier_ok(netdev)) {
1148 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1149 /* We've lost link, so the controller stops DMA,
1150 * but we've got queued Tx work that's never going
1151 * to get done, so reset controller to flush Tx.
1152 * (Do the reset outside of interrupt context). */
1153 schedule_work(&adapter->tx_timeout_task);
1154 /* return immediately since reset is imminent */
1155 return;
1156 }
1157 }
1158
1159 /* Force detection of hung controller every watchdog period */
1160 adapter->detect_tx_hung = true;
1161
1162 /* generate an interrupt to force clean up of any stragglers */
1163 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1164
1165 /* Reset the timer */
1166 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1167 }
1168
1169 #define IXGB_TX_FLAGS_CSUM 0x00000001
1170 #define IXGB_TX_FLAGS_VLAN 0x00000002
1171 #define IXGB_TX_FLAGS_TSO 0x00000004
1172
1173 static int
1174 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1175 {
1176 struct ixgb_context_desc *context_desc;
1177 unsigned int i;
1178 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1179 u16 ipcse, tucse, mss;
1180 int err;
1181
1182 if (likely(skb_is_gso(skb))) {
1183 struct ixgb_buffer *buffer_info;
1184 struct iphdr *iph;
1185
1186 if (skb_header_cloned(skb)) {
1187 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1188 if (err)
1189 return err;
1190 }
1191
1192 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1193 mss = skb_shinfo(skb)->gso_size;
1194 iph = ip_hdr(skb);
1195 iph->tot_len = 0;
1196 iph->check = 0;
1197 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1198 iph->daddr, 0,
1199 IPPROTO_TCP, 0);
1200 ipcss = skb_network_offset(skb);
1201 ipcso = (void *)&(iph->check) - (void *)skb->data;
1202 ipcse = skb_transport_offset(skb) - 1;
1203 tucss = skb_transport_offset(skb);
1204 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1205 tucse = 0;
1206
1207 i = adapter->tx_ring.next_to_use;
1208 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1209 buffer_info = &adapter->tx_ring.buffer_info[i];
1210 WARN_ON(buffer_info->dma != 0);
1211
1212 context_desc->ipcss = ipcss;
1213 context_desc->ipcso = ipcso;
1214 context_desc->ipcse = cpu_to_le16(ipcse);
1215 context_desc->tucss = tucss;
1216 context_desc->tucso = tucso;
1217 context_desc->tucse = cpu_to_le16(tucse);
1218 context_desc->mss = cpu_to_le16(mss);
1219 context_desc->hdr_len = hdr_len;
1220 context_desc->status = 0;
1221 context_desc->cmd_type_len = cpu_to_le32(
1222 IXGB_CONTEXT_DESC_TYPE
1223 | IXGB_CONTEXT_DESC_CMD_TSE
1224 | IXGB_CONTEXT_DESC_CMD_IP
1225 | IXGB_CONTEXT_DESC_CMD_TCP
1226 | IXGB_CONTEXT_DESC_CMD_IDE
1227 | (skb->len - (hdr_len)));
1228
1229
1230 if (++i == adapter->tx_ring.count) i = 0;
1231 adapter->tx_ring.next_to_use = i;
1232
1233 return 1;
1234 }
1235
1236 return 0;
1237 }
1238
1239 static bool
1240 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1241 {
1242 struct ixgb_context_desc *context_desc;
1243 unsigned int i;
1244 u8 css, cso;
1245
1246 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1247 struct ixgb_buffer *buffer_info;
1248 css = skb_transport_offset(skb);
1249 cso = css + skb->csum_offset;
1250
1251 i = adapter->tx_ring.next_to_use;
1252 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1253 buffer_info = &adapter->tx_ring.buffer_info[i];
1254 WARN_ON(buffer_info->dma != 0);
1255
1256 context_desc->tucss = css;
1257 context_desc->tucso = cso;
1258 context_desc->tucse = 0;
1259 /* zero out any previously existing data in one instruction */
1260 *(u32 *)&(context_desc->ipcss) = 0;
1261 context_desc->status = 0;
1262 context_desc->hdr_len = 0;
1263 context_desc->mss = 0;
1264 context_desc->cmd_type_len =
1265 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1266 | IXGB_TX_DESC_CMD_IDE);
1267
1268 if (++i == adapter->tx_ring.count) i = 0;
1269 adapter->tx_ring.next_to_use = i;
1270
1271 return true;
1272 }
1273
1274 return false;
1275 }
1276
1277 #define IXGB_MAX_TXD_PWR 14
1278 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1279
1280 static int
1281 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1282 unsigned int first)
1283 {
1284 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1285 struct pci_dev *pdev = adapter->pdev;
1286 struct ixgb_buffer *buffer_info;
1287 int len = skb_headlen(skb);
1288 unsigned int offset = 0, size, count = 0, i;
1289 unsigned int mss = skb_shinfo(skb)->gso_size;
1290 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1291 unsigned int f;
1292
1293 i = tx_ring->next_to_use;
1294
1295 while (len) {
1296 buffer_info = &tx_ring->buffer_info[i];
1297 size = min(len, IXGB_MAX_DATA_PER_TXD);
1298 /* Workaround for premature desc write-backs
1299 * in TSO mode. Append 4-byte sentinel desc */
1300 if (unlikely(mss && !nr_frags && size == len && size > 8))
1301 size -= 4;
1302
1303 buffer_info->length = size;
1304 WARN_ON(buffer_info->dma != 0);
1305 buffer_info->time_stamp = jiffies;
1306 buffer_info->mapped_as_page = false;
1307 buffer_info->dma = pci_map_single(pdev, skb->data + offset,
1308 size, PCI_DMA_TODEVICE);
1309 if (pci_dma_mapping_error(pdev, buffer_info->dma))
1310 goto dma_error;
1311 buffer_info->next_to_watch = 0;
1312
1313 len -= size;
1314 offset += size;
1315 count++;
1316 if (len) {
1317 i++;
1318 if (i == tx_ring->count)
1319 i = 0;
1320 }
1321 }
1322
1323 for (f = 0; f < nr_frags; f++) {
1324 struct skb_frag_struct *frag;
1325
1326 frag = &skb_shinfo(skb)->frags[f];
1327 len = frag->size;
1328 offset = frag->page_offset;
1329
1330 while (len) {
1331 i++;
1332 if (i == tx_ring->count)
1333 i = 0;
1334
1335 buffer_info = &tx_ring->buffer_info[i];
1336 size = min(len, IXGB_MAX_DATA_PER_TXD);
1337
1338 /* Workaround for premature desc write-backs
1339 * in TSO mode. Append 4-byte sentinel desc */
1340 if (unlikely(mss && (f == (nr_frags - 1))
1341 && size == len && size > 8))
1342 size -= 4;
1343
1344 buffer_info->length = size;
1345 buffer_info->time_stamp = jiffies;
1346 buffer_info->mapped_as_page = true;
1347 buffer_info->dma =
1348 pci_map_page(pdev, frag->page,
1349 offset, size,
1350 PCI_DMA_TODEVICE);
1351 if (pci_dma_mapping_error(pdev, buffer_info->dma))
1352 goto dma_error;
1353 buffer_info->next_to_watch = 0;
1354
1355 len -= size;
1356 offset += size;
1357 count++;
1358 }
1359 }
1360 tx_ring->buffer_info[i].skb = skb;
1361 tx_ring->buffer_info[first].next_to_watch = i;
1362
1363 return count;
1364
1365 dma_error:
1366 dev_err(&pdev->dev, "TX DMA map failed\n");
1367 buffer_info->dma = 0;
1368 if (count)
1369 count--;
1370
1371 while (count--) {
1372 if (i==0)
1373 i += tx_ring->count;
1374 i--;
1375 buffer_info = &tx_ring->buffer_info[i];
1376 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1377 }
1378
1379 return 0;
1380 }
1381
1382 static void
1383 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1384 {
1385 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1386 struct ixgb_tx_desc *tx_desc = NULL;
1387 struct ixgb_buffer *buffer_info;
1388 u32 cmd_type_len = adapter->tx_cmd_type;
1389 u8 status = 0;
1390 u8 popts = 0;
1391 unsigned int i;
1392
1393 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1394 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1395 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1396 }
1397
1398 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1399 popts |= IXGB_TX_DESC_POPTS_TXSM;
1400
1401 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1402 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1403
1404 i = tx_ring->next_to_use;
1405
1406 while (count--) {
1407 buffer_info = &tx_ring->buffer_info[i];
1408 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1409 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1410 tx_desc->cmd_type_len =
1411 cpu_to_le32(cmd_type_len | buffer_info->length);
1412 tx_desc->status = status;
1413 tx_desc->popts = popts;
1414 tx_desc->vlan = cpu_to_le16(vlan_id);
1415
1416 if (++i == tx_ring->count) i = 0;
1417 }
1418
1419 tx_desc->cmd_type_len |=
1420 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1421
1422 /* Force memory writes to complete before letting h/w
1423 * know there are new descriptors to fetch. (Only
1424 * applicable for weak-ordered memory model archs,
1425 * such as IA-64). */
1426 wmb();
1427
1428 tx_ring->next_to_use = i;
1429 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1430 }
1431
1432 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1433 {
1434 struct ixgb_adapter *adapter = netdev_priv(netdev);
1435 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1436
1437 netif_stop_queue(netdev);
1438 /* Herbert's original patch had:
1439 * smp_mb__after_netif_stop_queue();
1440 * but since that doesn't exist yet, just open code it. */
1441 smp_mb();
1442
1443 /* We need to check again in a case another CPU has just
1444 * made room available. */
1445 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1446 return -EBUSY;
1447
1448 /* A reprieve! */
1449 netif_start_queue(netdev);
1450 ++adapter->restart_queue;
1451 return 0;
1452 }
1453
1454 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1455 struct ixgb_desc_ring *tx_ring, int size)
1456 {
1457 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1458 return 0;
1459 return __ixgb_maybe_stop_tx(netdev, size);
1460 }
1461
1462
1463 /* Tx Descriptors needed, worst case */
1464 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1465 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1466 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1467 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1468 + 1 /* one more needed for sentinel TSO workaround */
1469
1470 static netdev_tx_t
1471 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1472 {
1473 struct ixgb_adapter *adapter = netdev_priv(netdev);
1474 unsigned int first;
1475 unsigned int tx_flags = 0;
1476 int vlan_id = 0;
1477 int count = 0;
1478 int tso;
1479
1480 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1481 dev_kfree_skb(skb);
1482 return NETDEV_TX_OK;
1483 }
1484
1485 if (skb->len <= 0) {
1486 dev_kfree_skb(skb);
1487 return NETDEV_TX_OK;
1488 }
1489
1490 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1491 DESC_NEEDED)))
1492 return NETDEV_TX_BUSY;
1493
1494 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1495 tx_flags |= IXGB_TX_FLAGS_VLAN;
1496 vlan_id = vlan_tx_tag_get(skb);
1497 }
1498
1499 first = adapter->tx_ring.next_to_use;
1500
1501 tso = ixgb_tso(adapter, skb);
1502 if (tso < 0) {
1503 dev_kfree_skb(skb);
1504 return NETDEV_TX_OK;
1505 }
1506
1507 if (likely(tso))
1508 tx_flags |= IXGB_TX_FLAGS_TSO;
1509 else if (ixgb_tx_csum(adapter, skb))
1510 tx_flags |= IXGB_TX_FLAGS_CSUM;
1511
1512 count = ixgb_tx_map(adapter, skb, first);
1513
1514 if (count) {
1515 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1516 /* Make sure there is space in the ring for the next send. */
1517 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1518
1519 } else {
1520 dev_kfree_skb_any(skb);
1521 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1522 adapter->tx_ring.next_to_use = first;
1523 }
1524
1525 return NETDEV_TX_OK;
1526 }
1527
1528 /**
1529 * ixgb_tx_timeout - Respond to a Tx Hang
1530 * @netdev: network interface device structure
1531 **/
1532
1533 static void
1534 ixgb_tx_timeout(struct net_device *netdev)
1535 {
1536 struct ixgb_adapter *adapter = netdev_priv(netdev);
1537
1538 /* Do the reset outside of interrupt context */
1539 schedule_work(&adapter->tx_timeout_task);
1540 }
1541
1542 static void
1543 ixgb_tx_timeout_task(struct work_struct *work)
1544 {
1545 struct ixgb_adapter *adapter =
1546 container_of(work, struct ixgb_adapter, tx_timeout_task);
1547
1548 adapter->tx_timeout_count++;
1549 ixgb_down(adapter, true);
1550 ixgb_up(adapter);
1551 }
1552
1553 /**
1554 * ixgb_get_stats - Get System Network Statistics
1555 * @netdev: network interface device structure
1556 *
1557 * Returns the address of the device statistics structure.
1558 * The statistics are actually updated from the timer callback.
1559 **/
1560
1561 static struct net_device_stats *
1562 ixgb_get_stats(struct net_device *netdev)
1563 {
1564 return &netdev->stats;
1565 }
1566
1567 /**
1568 * ixgb_change_mtu - Change the Maximum Transfer Unit
1569 * @netdev: network interface device structure
1570 * @new_mtu: new value for maximum frame size
1571 *
1572 * Returns 0 on success, negative on failure
1573 **/
1574
1575 static int
1576 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1577 {
1578 struct ixgb_adapter *adapter = netdev_priv(netdev);
1579 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1580 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1581
1582 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1583 if ((new_mtu < 68) ||
1584 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1585 netif_err(adapter, probe, adapter->netdev,
1586 "Invalid MTU setting %d\n", new_mtu);
1587 return -EINVAL;
1588 }
1589
1590 if (old_max_frame == max_frame)
1591 return 0;
1592
1593 if (netif_running(netdev))
1594 ixgb_down(adapter, true);
1595
1596 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1597
1598 netdev->mtu = new_mtu;
1599
1600 if (netif_running(netdev))
1601 ixgb_up(adapter);
1602
1603 return 0;
1604 }
1605
1606 /**
1607 * ixgb_update_stats - Update the board statistics counters.
1608 * @adapter: board private structure
1609 **/
1610
1611 void
1612 ixgb_update_stats(struct ixgb_adapter *adapter)
1613 {
1614 struct net_device *netdev = adapter->netdev;
1615 struct pci_dev *pdev = adapter->pdev;
1616
1617 /* Prevent stats update while adapter is being reset */
1618 if (pci_channel_offline(pdev))
1619 return;
1620
1621 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1622 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1623 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1624 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1625 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1626 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1627
1628 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1629 /* fix up multicast stats by removing broadcasts */
1630 if (multi >= bcast)
1631 multi -= bcast;
1632
1633 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1634 adapter->stats.mprch += (multi >> 32);
1635 adapter->stats.bprcl += bcast_l;
1636 adapter->stats.bprch += bcast_h;
1637 } else {
1638 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1639 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1640 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1641 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1642 }
1643 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1644 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1645 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1646 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1647 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1648 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1649 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1650 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1651 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1652 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1653 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1654 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1655 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1656 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1657 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1658 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1659 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1660 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1661 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1662 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1663 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1664 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1665 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1666 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1667 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1668 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1669 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1670 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1671 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1672 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1673 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1674 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1675 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1676 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1677 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1678 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1679 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1680 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1681 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1682 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1683 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1684 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1685 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1686 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1687 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1688 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1689 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1690 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1691 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1692 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1693 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1694 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1695 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1696 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1697 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1698 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1699
1700 /* Fill out the OS statistics structure */
1701
1702 netdev->stats.rx_packets = adapter->stats.gprcl;
1703 netdev->stats.tx_packets = adapter->stats.gptcl;
1704 netdev->stats.rx_bytes = adapter->stats.gorcl;
1705 netdev->stats.tx_bytes = adapter->stats.gotcl;
1706 netdev->stats.multicast = adapter->stats.mprcl;
1707 netdev->stats.collisions = 0;
1708
1709 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1710 * with a length in the type/len field */
1711 netdev->stats.rx_errors =
1712 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1713 adapter->stats.ruc +
1714 adapter->stats.roc /*+ adapter->stats.rlec */ +
1715 adapter->stats.icbc +
1716 adapter->stats.ecbc + adapter->stats.mpc;
1717
1718 /* see above
1719 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1720 */
1721
1722 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1723 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1724 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1725 netdev->stats.rx_over_errors = adapter->stats.mpc;
1726
1727 netdev->stats.tx_errors = 0;
1728 netdev->stats.rx_frame_errors = 0;
1729 netdev->stats.tx_aborted_errors = 0;
1730 netdev->stats.tx_carrier_errors = 0;
1731 netdev->stats.tx_fifo_errors = 0;
1732 netdev->stats.tx_heartbeat_errors = 0;
1733 netdev->stats.tx_window_errors = 0;
1734 }
1735
1736 #define IXGB_MAX_INTR 10
1737 /**
1738 * ixgb_intr - Interrupt Handler
1739 * @irq: interrupt number
1740 * @data: pointer to a network interface device structure
1741 **/
1742
1743 static irqreturn_t
1744 ixgb_intr(int irq, void *data)
1745 {
1746 struct net_device *netdev = data;
1747 struct ixgb_adapter *adapter = netdev_priv(netdev);
1748 struct ixgb_hw *hw = &adapter->hw;
1749 u32 icr = IXGB_READ_REG(hw, ICR);
1750
1751 if (unlikely(!icr))
1752 return IRQ_NONE; /* Not our interrupt */
1753
1754 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1755 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1756 mod_timer(&adapter->watchdog_timer, jiffies);
1757
1758 if (napi_schedule_prep(&adapter->napi)) {
1759
1760 /* Disable interrupts and register for poll. The flush
1761 of the posted write is intentionally left out.
1762 */
1763
1764 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1765 __napi_schedule(&adapter->napi);
1766 }
1767 return IRQ_HANDLED;
1768 }
1769
1770 /**
1771 * ixgb_clean - NAPI Rx polling callback
1772 * @adapter: board private structure
1773 **/
1774
1775 static int
1776 ixgb_clean(struct napi_struct *napi, int budget)
1777 {
1778 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1779 int work_done = 0;
1780
1781 ixgb_clean_tx_irq(adapter);
1782 ixgb_clean_rx_irq(adapter, &work_done, budget);
1783
1784 /* If budget not fully consumed, exit the polling mode */
1785 if (work_done < budget) {
1786 napi_complete(napi);
1787 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1788 ixgb_irq_enable(adapter);
1789 }
1790
1791 return work_done;
1792 }
1793
1794 /**
1795 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1796 * @adapter: board private structure
1797 **/
1798
1799 static bool
1800 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1801 {
1802 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1803 struct net_device *netdev = adapter->netdev;
1804 struct ixgb_tx_desc *tx_desc, *eop_desc;
1805 struct ixgb_buffer *buffer_info;
1806 unsigned int i, eop;
1807 bool cleaned = false;
1808
1809 i = tx_ring->next_to_clean;
1810 eop = tx_ring->buffer_info[i].next_to_watch;
1811 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1812
1813 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1814
1815 for (cleaned = false; !cleaned; ) {
1816 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1817 buffer_info = &tx_ring->buffer_info[i];
1818
1819 if (tx_desc->popts &
1820 (IXGB_TX_DESC_POPTS_TXSM |
1821 IXGB_TX_DESC_POPTS_IXSM))
1822 adapter->hw_csum_tx_good++;
1823
1824 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1825
1826 *(u32 *)&(tx_desc->status) = 0;
1827
1828 cleaned = (i == eop);
1829 if (++i == tx_ring->count) i = 0;
1830 }
1831
1832 eop = tx_ring->buffer_info[i].next_to_watch;
1833 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1834 }
1835
1836 tx_ring->next_to_clean = i;
1837
1838 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1839 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1840 /* Make sure that anybody stopping the queue after this
1841 * sees the new next_to_clean. */
1842 smp_mb();
1843
1844 if (netif_queue_stopped(netdev) &&
1845 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1846 netif_wake_queue(netdev);
1847 ++adapter->restart_queue;
1848 }
1849 }
1850
1851 if (adapter->detect_tx_hung) {
1852 /* detect a transmit hang in hardware, this serializes the
1853 * check with the clearing of time_stamp and movement of i */
1854 adapter->detect_tx_hung = false;
1855 if (tx_ring->buffer_info[eop].time_stamp &&
1856 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1857 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1858 IXGB_STATUS_TXOFF)) {
1859 /* detected Tx unit hang */
1860 netif_err(adapter, drv, adapter->netdev,
1861 "Detected Tx Unit Hang\n"
1862 " TDH <%x>\n"
1863 " TDT <%x>\n"
1864 " next_to_use <%x>\n"
1865 " next_to_clean <%x>\n"
1866 "buffer_info[next_to_clean]\n"
1867 " time_stamp <%lx>\n"
1868 " next_to_watch <%x>\n"
1869 " jiffies <%lx>\n"
1870 " next_to_watch.status <%x>\n",
1871 IXGB_READ_REG(&adapter->hw, TDH),
1872 IXGB_READ_REG(&adapter->hw, TDT),
1873 tx_ring->next_to_use,
1874 tx_ring->next_to_clean,
1875 tx_ring->buffer_info[eop].time_stamp,
1876 eop,
1877 jiffies,
1878 eop_desc->status);
1879 netif_stop_queue(netdev);
1880 }
1881 }
1882
1883 return cleaned;
1884 }
1885
1886 /**
1887 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1888 * @adapter: board private structure
1889 * @rx_desc: receive descriptor
1890 * @sk_buff: socket buffer with received data
1891 **/
1892
1893 static void
1894 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1895 struct ixgb_rx_desc *rx_desc,
1896 struct sk_buff *skb)
1897 {
1898 /* Ignore Checksum bit is set OR
1899 * TCP Checksum has not been calculated
1900 */
1901 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1902 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1903 skb->ip_summed = CHECKSUM_NONE;
1904 return;
1905 }
1906
1907 /* At this point we know the hardware did the TCP checksum */
1908 /* now look at the TCP checksum error bit */
1909 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1910 /* let the stack verify checksum errors */
1911 skb->ip_summed = CHECKSUM_NONE;
1912 adapter->hw_csum_rx_error++;
1913 } else {
1914 /* TCP checksum is good */
1915 skb->ip_summed = CHECKSUM_UNNECESSARY;
1916 adapter->hw_csum_rx_good++;
1917 }
1918 }
1919
1920 /**
1921 * ixgb_clean_rx_irq - Send received data up the network stack,
1922 * @adapter: board private structure
1923 **/
1924
1925 static bool
1926 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1927 {
1928 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1929 struct net_device *netdev = adapter->netdev;
1930 struct pci_dev *pdev = adapter->pdev;
1931 struct ixgb_rx_desc *rx_desc, *next_rxd;
1932 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1933 u32 length;
1934 unsigned int i, j;
1935 int cleaned_count = 0;
1936 bool cleaned = false;
1937
1938 i = rx_ring->next_to_clean;
1939 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1940 buffer_info = &rx_ring->buffer_info[i];
1941
1942 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1943 struct sk_buff *skb;
1944 u8 status;
1945
1946 if (*work_done >= work_to_do)
1947 break;
1948
1949 (*work_done)++;
1950 status = rx_desc->status;
1951 skb = buffer_info->skb;
1952 buffer_info->skb = NULL;
1953
1954 prefetch(skb->data - NET_IP_ALIGN);
1955
1956 if (++i == rx_ring->count) i = 0;
1957 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1958 prefetch(next_rxd);
1959
1960 if ((j = i + 1) == rx_ring->count) j = 0;
1961 next2_buffer = &rx_ring->buffer_info[j];
1962 prefetch(next2_buffer);
1963
1964 next_buffer = &rx_ring->buffer_info[i];
1965
1966 cleaned = true;
1967 cleaned_count++;
1968
1969 pci_unmap_single(pdev,
1970 buffer_info->dma,
1971 buffer_info->length,
1972 PCI_DMA_FROMDEVICE);
1973 buffer_info->dma = 0;
1974
1975 length = le16_to_cpu(rx_desc->length);
1976 rx_desc->length = 0;
1977
1978 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1979
1980 /* All receives must fit into a single buffer */
1981
1982 IXGB_DBG("Receive packet consumed multiple buffers "
1983 "length<%x>\n", length);
1984
1985 dev_kfree_skb_irq(skb);
1986 goto rxdesc_done;
1987 }
1988
1989 if (unlikely(rx_desc->errors &
1990 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1991 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1992 dev_kfree_skb_irq(skb);
1993 goto rxdesc_done;
1994 }
1995
1996 /* code added for copybreak, this should improve
1997 * performance for small packets with large amounts
1998 * of reassembly being done in the stack */
1999 if (length < copybreak) {
2000 struct sk_buff *new_skb =
2001 netdev_alloc_skb_ip_align(netdev, length);
2002 if (new_skb) {
2003 skb_copy_to_linear_data_offset(new_skb,
2004 -NET_IP_ALIGN,
2005 (skb->data -
2006 NET_IP_ALIGN),
2007 (length +
2008 NET_IP_ALIGN));
2009 /* save the skb in buffer_info as good */
2010 buffer_info->skb = skb;
2011 skb = new_skb;
2012 }
2013 }
2014 /* end copybreak code */
2015
2016 /* Good Receive */
2017 skb_put(skb, length);
2018
2019 /* Receive Checksum Offload */
2020 ixgb_rx_checksum(adapter, rx_desc, skb);
2021
2022 skb->protocol = eth_type_trans(skb, netdev);
2023 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2024 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2025 le16_to_cpu(rx_desc->special));
2026 } else {
2027 netif_receive_skb(skb);
2028 }
2029
2030 rxdesc_done:
2031 /* clean up descriptor, might be written over by hw */
2032 rx_desc->status = 0;
2033
2034 /* return some buffers to hardware, one at a time is too slow */
2035 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2036 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2037 cleaned_count = 0;
2038 }
2039
2040 /* use prefetched values */
2041 rx_desc = next_rxd;
2042 buffer_info = next_buffer;
2043 }
2044
2045 rx_ring->next_to_clean = i;
2046
2047 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2048 if (cleaned_count)
2049 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2050
2051 return cleaned;
2052 }
2053
2054 /**
2055 * ixgb_alloc_rx_buffers - Replace used receive buffers
2056 * @adapter: address of board private structure
2057 **/
2058
2059 static void
2060 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2061 {
2062 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2063 struct net_device *netdev = adapter->netdev;
2064 struct pci_dev *pdev = adapter->pdev;
2065 struct ixgb_rx_desc *rx_desc;
2066 struct ixgb_buffer *buffer_info;
2067 struct sk_buff *skb;
2068 unsigned int i;
2069 long cleancount;
2070
2071 i = rx_ring->next_to_use;
2072 buffer_info = &rx_ring->buffer_info[i];
2073 cleancount = IXGB_DESC_UNUSED(rx_ring);
2074
2075
2076 /* leave three descriptors unused */
2077 while (--cleancount > 2 && cleaned_count--) {
2078 /* recycle! its good for you */
2079 skb = buffer_info->skb;
2080 if (skb) {
2081 skb_trim(skb, 0);
2082 goto map_skb;
2083 }
2084
2085 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2086 if (unlikely(!skb)) {
2087 /* Better luck next round */
2088 adapter->alloc_rx_buff_failed++;
2089 break;
2090 }
2091
2092 buffer_info->skb = skb;
2093 buffer_info->length = adapter->rx_buffer_len;
2094 map_skb:
2095 buffer_info->dma = pci_map_single(pdev,
2096 skb->data,
2097 adapter->rx_buffer_len,
2098 PCI_DMA_FROMDEVICE);
2099
2100 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2101 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2102 /* guarantee DD bit not set now before h/w gets descriptor
2103 * this is the rest of the workaround for h/w double
2104 * writeback. */
2105 rx_desc->status = 0;
2106
2107
2108 if (++i == rx_ring->count) i = 0;
2109 buffer_info = &rx_ring->buffer_info[i];
2110 }
2111
2112 if (likely(rx_ring->next_to_use != i)) {
2113 rx_ring->next_to_use = i;
2114 if (unlikely(i-- == 0))
2115 i = (rx_ring->count - 1);
2116
2117 /* Force memory writes to complete before letting h/w
2118 * know there are new descriptors to fetch. (Only
2119 * applicable for weak-ordered memory model archs, such
2120 * as IA-64). */
2121 wmb();
2122 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2123 }
2124 }
2125
2126 /**
2127 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2128 *
2129 * @param netdev network interface device structure
2130 * @param grp indicates to enable or disable tagging/stripping
2131 **/
2132 static void
2133 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2134 {
2135 struct ixgb_adapter *adapter = netdev_priv(netdev);
2136 u32 ctrl, rctl;
2137
2138 ixgb_irq_disable(adapter);
2139 adapter->vlgrp = grp;
2140
2141 if (grp) {
2142 /* enable VLAN tag insert/strip */
2143 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2144 ctrl |= IXGB_CTRL0_VME;
2145 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2146
2147 /* enable VLAN receive filtering */
2148
2149 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2150 rctl &= ~IXGB_RCTL_CFIEN;
2151 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2152 } else {
2153 /* disable VLAN tag insert/strip */
2154
2155 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2156 ctrl &= ~IXGB_CTRL0_VME;
2157 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2158 }
2159
2160 /* don't enable interrupts unless we are UP */
2161 if (adapter->netdev->flags & IFF_UP)
2162 ixgb_irq_enable(adapter);
2163 }
2164
2165 static void
2166 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2167 {
2168 struct ixgb_adapter *adapter = netdev_priv(netdev);
2169 u32 vfta, index;
2170
2171 /* add VID to filter table */
2172
2173 index = (vid >> 5) & 0x7F;
2174 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2175 vfta |= (1 << (vid & 0x1F));
2176 ixgb_write_vfta(&adapter->hw, index, vfta);
2177 }
2178
2179 static void
2180 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2181 {
2182 struct ixgb_adapter *adapter = netdev_priv(netdev);
2183 u32 vfta, index;
2184
2185 ixgb_irq_disable(adapter);
2186
2187 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2188
2189 /* don't enable interrupts unless we are UP */
2190 if (adapter->netdev->flags & IFF_UP)
2191 ixgb_irq_enable(adapter);
2192
2193 /* remove VID from filter table */
2194
2195 index = (vid >> 5) & 0x7F;
2196 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2197 vfta &= ~(1 << (vid & 0x1F));
2198 ixgb_write_vfta(&adapter->hw, index, vfta);
2199 }
2200
2201 static void
2202 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2203 {
2204 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2205
2206 if (adapter->vlgrp) {
2207 u16 vid;
2208 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2209 if (!vlan_group_get_device(adapter->vlgrp, vid))
2210 continue;
2211 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2212 }
2213 }
2214 }
2215
2216 #ifdef CONFIG_NET_POLL_CONTROLLER
2217 /*
2218 * Polling 'interrupt' - used by things like netconsole to send skbs
2219 * without having to re-enable interrupts. It's not called while
2220 * the interrupt routine is executing.
2221 */
2222
2223 static void ixgb_netpoll(struct net_device *dev)
2224 {
2225 struct ixgb_adapter *adapter = netdev_priv(dev);
2226
2227 disable_irq(adapter->pdev->irq);
2228 ixgb_intr(adapter->pdev->irq, dev);
2229 enable_irq(adapter->pdev->irq);
2230 }
2231 #endif
2232
2233 /**
2234 * ixgb_io_error_detected() - called when PCI error is detected
2235 * @pdev pointer to pci device with error
2236 * @state pci channel state after error
2237 *
2238 * This callback is called by the PCI subsystem whenever
2239 * a PCI bus error is detected.
2240 */
2241 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2242 enum pci_channel_state state)
2243 {
2244 struct net_device *netdev = pci_get_drvdata(pdev);
2245 struct ixgb_adapter *adapter = netdev_priv(netdev);
2246
2247 netif_device_detach(netdev);
2248
2249 if (state == pci_channel_io_perm_failure)
2250 return PCI_ERS_RESULT_DISCONNECT;
2251
2252 if (netif_running(netdev))
2253 ixgb_down(adapter, true);
2254
2255 pci_disable_device(pdev);
2256
2257 /* Request a slot reset. */
2258 return PCI_ERS_RESULT_NEED_RESET;
2259 }
2260
2261 /**
2262 * ixgb_io_slot_reset - called after the pci bus has been reset.
2263 * @pdev pointer to pci device with error
2264 *
2265 * This callback is called after the PCI bus has been reset.
2266 * Basically, this tries to restart the card from scratch.
2267 * This is a shortened version of the device probe/discovery code,
2268 * it resembles the first-half of the ixgb_probe() routine.
2269 */
2270 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2271 {
2272 struct net_device *netdev = pci_get_drvdata(pdev);
2273 struct ixgb_adapter *adapter = netdev_priv(netdev);
2274
2275 if (pci_enable_device(pdev)) {
2276 netif_err(adapter, probe, adapter->netdev,
2277 "Cannot re-enable PCI device after reset\n");
2278 return PCI_ERS_RESULT_DISCONNECT;
2279 }
2280
2281 /* Perform card reset only on one instance of the card */
2282 if (0 != PCI_FUNC (pdev->devfn))
2283 return PCI_ERS_RESULT_RECOVERED;
2284
2285 pci_set_master(pdev);
2286
2287 netif_carrier_off(netdev);
2288 netif_stop_queue(netdev);
2289 ixgb_reset(adapter);
2290
2291 /* Make sure the EEPROM is good */
2292 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2293 netif_err(adapter, probe, adapter->netdev,
2294 "After reset, the EEPROM checksum is not valid\n");
2295 return PCI_ERS_RESULT_DISCONNECT;
2296 }
2297 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2298 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2299
2300 if (!is_valid_ether_addr(netdev->perm_addr)) {
2301 netif_err(adapter, probe, adapter->netdev,
2302 "After reset, invalid MAC address\n");
2303 return PCI_ERS_RESULT_DISCONNECT;
2304 }
2305
2306 return PCI_ERS_RESULT_RECOVERED;
2307 }
2308
2309 /**
2310 * ixgb_io_resume - called when its OK to resume normal operations
2311 * @pdev pointer to pci device with error
2312 *
2313 * The error recovery driver tells us that its OK to resume
2314 * normal operation. Implementation resembles the second-half
2315 * of the ixgb_probe() routine.
2316 */
2317 static void ixgb_io_resume(struct pci_dev *pdev)
2318 {
2319 struct net_device *netdev = pci_get_drvdata(pdev);
2320 struct ixgb_adapter *adapter = netdev_priv(netdev);
2321
2322 pci_set_master(pdev);
2323
2324 if (netif_running(netdev)) {
2325 if (ixgb_up(adapter)) {
2326 printk ("ixgb: can't bring device back up after reset\n");
2327 return;
2328 }
2329 }
2330
2331 netif_device_attach(netdev);
2332 mod_timer(&adapter->watchdog_timer, jiffies);
2333 }
2334
2335 /* ixgb_main.c */
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