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Merge branch 'wireless-next-2.6' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include "ixgb.h"
32
33 char ixgb_driver_name[] = "ixgb";
34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
35
36 #define DRIVERNAPI "-NAPI"
37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
38 const char ixgb_driver_version[] = DRV_VERSION;
39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
40
41 #define IXGB_CB_LENGTH 256
42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
43 module_param(copybreak, uint, 0644);
44 MODULE_PARM_DESC(copybreak,
45 "Maximum size of packet that is copied to a new buffer on receive");
46
47 /* ixgb_pci_tbl - PCI Device ID Table
48 *
49 * Wildcard entries (PCI_ANY_ID) should come last
50 * Last entry must be all 0s
51 *
52 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
53 * Class, Class Mask, private data (not used) }
54 */
55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
56 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
57 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
58 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
59 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
60 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
61 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
62 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
63 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
64
65 /* required last entry */
66 {0,}
67 };
68
69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
70
71 /* Local Function Prototypes */
72 static int ixgb_init_module(void);
73 static void ixgb_exit_module(void);
74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
75 static void __devexit ixgb_remove(struct pci_dev *pdev);
76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
77 static int ixgb_open(struct net_device *netdev);
78 static int ixgb_close(struct net_device *netdev);
79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
84 static void ixgb_set_multi(struct net_device *netdev);
85 static void ixgb_watchdog(unsigned long data);
86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
87 struct net_device *netdev);
88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
90 static int ixgb_set_mac(struct net_device *netdev, void *p);
91 static irqreturn_t ixgb_intr(int irq, void *data);
92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
93
94 static int ixgb_clean(struct napi_struct *, int);
95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
97
98 static void ixgb_tx_timeout(struct net_device *dev);
99 static void ixgb_tx_timeout_task(struct work_struct *work);
100
101 static void ixgb_vlan_rx_register(struct net_device *netdev,
102 struct vlan_group *grp);
103 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
104 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
105 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
106
107 #ifdef CONFIG_NET_POLL_CONTROLLER
108 /* for netdump / net console */
109 static void ixgb_netpoll(struct net_device *dev);
110 #endif
111
112 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
113 enum pci_channel_state state);
114 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
115 static void ixgb_io_resume (struct pci_dev *pdev);
116
117 static struct pci_error_handlers ixgb_err_handler = {
118 .error_detected = ixgb_io_error_detected,
119 .slot_reset = ixgb_io_slot_reset,
120 .resume = ixgb_io_resume,
121 };
122
123 static struct pci_driver ixgb_driver = {
124 .name = ixgb_driver_name,
125 .id_table = ixgb_pci_tbl,
126 .probe = ixgb_probe,
127 .remove = __devexit_p(ixgb_remove),
128 .err_handler = &ixgb_err_handler
129 };
130
131 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
132 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
133 MODULE_LICENSE("GPL");
134 MODULE_VERSION(DRV_VERSION);
135
136 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
137 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
138 module_param(debug, int, 0);
139 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
140
141 /**
142 * ixgb_init_module - Driver Registration Routine
143 *
144 * ixgb_init_module is the first routine called when the driver is
145 * loaded. All it does is register with the PCI subsystem.
146 **/
147
148 static int __init
149 ixgb_init_module(void)
150 {
151 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
152 pr_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 pci_using_dac = 0;
372 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
373 if (!err) {
374 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
375 if (!err)
376 pci_using_dac = 1;
377 } else {
378 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
379 if (err) {
380 err = dma_set_coherent_mask(&pdev->dev,
381 DMA_BIT_MASK(32));
382 if (err) {
383 pr_err("No usable DMA configuration, aborting\n");
384 goto err_dma_mask;
385 }
386 }
387 }
388
389 err = pci_request_regions(pdev, ixgb_driver_name);
390 if (err)
391 goto err_request_regions;
392
393 pci_set_master(pdev);
394
395 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
396 if (!netdev) {
397 err = -ENOMEM;
398 goto err_alloc_etherdev;
399 }
400
401 SET_NETDEV_DEV(netdev, &pdev->dev);
402
403 pci_set_drvdata(pdev, netdev);
404 adapter = netdev_priv(netdev);
405 adapter->netdev = netdev;
406 adapter->pdev = pdev;
407 adapter->hw.back = adapter;
408 adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
409
410 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
411 if (!adapter->hw.hw_addr) {
412 err = -EIO;
413 goto err_ioremap;
414 }
415
416 for (i = BAR_1; i <= BAR_5; i++) {
417 if (pci_resource_len(pdev, i) == 0)
418 continue;
419 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
420 adapter->hw.io_base = pci_resource_start(pdev, i);
421 break;
422 }
423 }
424
425 netdev->netdev_ops = &ixgb_netdev_ops;
426 ixgb_set_ethtool_ops(netdev);
427 netdev->watchdog_timeo = 5 * HZ;
428 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
429
430 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
431
432 adapter->bd_number = cards_found;
433 adapter->link_speed = 0;
434 adapter->link_duplex = 0;
435
436 /* setup the private structure */
437
438 err = ixgb_sw_init(adapter);
439 if (err)
440 goto err_sw_init;
441
442 netdev->features = NETIF_F_SG |
443 NETIF_F_HW_CSUM |
444 NETIF_F_HW_VLAN_TX |
445 NETIF_F_HW_VLAN_RX |
446 NETIF_F_HW_VLAN_FILTER;
447 netdev->features |= NETIF_F_TSO;
448
449 if (pci_using_dac)
450 netdev->features |= NETIF_F_HIGHDMA;
451
452 /* make sure the EEPROM is good */
453
454 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
455 netif_err(adapter, probe, adapter->netdev,
456 "The EEPROM Checksum Is Not Valid\n");
457 err = -EIO;
458 goto err_eeprom;
459 }
460
461 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
462 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
463
464 if (!is_valid_ether_addr(netdev->perm_addr)) {
465 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
466 err = -EIO;
467 goto err_eeprom;
468 }
469
470 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
471
472 init_timer(&adapter->watchdog_timer);
473 adapter->watchdog_timer.function = &ixgb_watchdog;
474 adapter->watchdog_timer.data = (unsigned long)adapter;
475
476 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
477
478 strcpy(netdev->name, "eth%d");
479 err = register_netdev(netdev);
480 if (err)
481 goto err_register;
482
483 /* carrier off reporting is important to ethtool even BEFORE open */
484 netif_carrier_off(netdev);
485
486 netif_info(adapter, probe, adapter->netdev,
487 "Intel(R) PRO/10GbE Network Connection\n");
488 ixgb_check_options(adapter);
489 /* reset the hardware with the new settings */
490
491 ixgb_reset(adapter);
492
493 cards_found++;
494 return 0;
495
496 err_register:
497 err_sw_init:
498 err_eeprom:
499 iounmap(adapter->hw.hw_addr);
500 err_ioremap:
501 free_netdev(netdev);
502 err_alloc_etherdev:
503 pci_release_regions(pdev);
504 err_request_regions:
505 err_dma_mask:
506 pci_disable_device(pdev);
507 return err;
508 }
509
510 /**
511 * ixgb_remove - Device Removal Routine
512 * @pdev: PCI device information struct
513 *
514 * ixgb_remove is called by the PCI subsystem to alert the driver
515 * that it should release a PCI device. The could be caused by a
516 * Hot-Plug event, or because the driver is going to be removed from
517 * memory.
518 **/
519
520 static void __devexit
521 ixgb_remove(struct pci_dev *pdev)
522 {
523 struct net_device *netdev = pci_get_drvdata(pdev);
524 struct ixgb_adapter *adapter = netdev_priv(netdev);
525
526 flush_scheduled_work();
527
528 unregister_netdev(netdev);
529
530 iounmap(adapter->hw.hw_addr);
531 pci_release_regions(pdev);
532
533 free_netdev(netdev);
534 }
535
536 /**
537 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
538 * @adapter: board private structure to initialize
539 *
540 * ixgb_sw_init initializes the Adapter private data structure.
541 * Fields are initialized based on PCI device information and
542 * OS network device settings (MTU size).
543 **/
544
545 static int __devinit
546 ixgb_sw_init(struct ixgb_adapter *adapter)
547 {
548 struct ixgb_hw *hw = &adapter->hw;
549 struct net_device *netdev = adapter->netdev;
550 struct pci_dev *pdev = adapter->pdev;
551
552 /* PCI config space info */
553
554 hw->vendor_id = pdev->vendor;
555 hw->device_id = pdev->device;
556 hw->subsystem_vendor_id = pdev->subsystem_vendor;
557 hw->subsystem_id = pdev->subsystem_device;
558
559 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
560 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
561
562 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
563 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
564 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
565 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
566 hw->mac_type = ixgb_82597;
567 else {
568 /* should never have loaded on this device */
569 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
570 }
571
572 /* enable flow control to be programmed */
573 hw->fc.send_xon = 1;
574
575 set_bit(__IXGB_DOWN, &adapter->flags);
576 return 0;
577 }
578
579 /**
580 * ixgb_open - Called when a network interface is made active
581 * @netdev: network interface device structure
582 *
583 * Returns 0 on success, negative value on failure
584 *
585 * The open entry point is called when a network interface is made
586 * active by the system (IFF_UP). At this point all resources needed
587 * for transmit and receive operations are allocated, the interrupt
588 * handler is registered with the OS, the watchdog timer is started,
589 * and the stack is notified that the interface is ready.
590 **/
591
592 static int
593 ixgb_open(struct net_device *netdev)
594 {
595 struct ixgb_adapter *adapter = netdev_priv(netdev);
596 int err;
597
598 /* allocate transmit descriptors */
599 err = ixgb_setup_tx_resources(adapter);
600 if (err)
601 goto err_setup_tx;
602
603 netif_carrier_off(netdev);
604
605 /* allocate receive descriptors */
606
607 err = ixgb_setup_rx_resources(adapter);
608 if (err)
609 goto err_setup_rx;
610
611 err = ixgb_up(adapter);
612 if (err)
613 goto err_up;
614
615 netif_start_queue(netdev);
616
617 return 0;
618
619 err_up:
620 ixgb_free_rx_resources(adapter);
621 err_setup_rx:
622 ixgb_free_tx_resources(adapter);
623 err_setup_tx:
624 ixgb_reset(adapter);
625
626 return err;
627 }
628
629 /**
630 * ixgb_close - Disables a network interface
631 * @netdev: network interface device structure
632 *
633 * Returns 0, this is not allowed to fail
634 *
635 * The close entry point is called when an interface is de-activated
636 * by the OS. The hardware is still under the drivers control, but
637 * needs to be disabled. A global MAC reset is issued to stop the
638 * hardware, and all transmit and receive resources are freed.
639 **/
640
641 static int
642 ixgb_close(struct net_device *netdev)
643 {
644 struct ixgb_adapter *adapter = netdev_priv(netdev);
645
646 ixgb_down(adapter, true);
647
648 ixgb_free_tx_resources(adapter);
649 ixgb_free_rx_resources(adapter);
650
651 return 0;
652 }
653
654 /**
655 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
656 * @adapter: board private structure
657 *
658 * Return 0 on success, negative on failure
659 **/
660
661 int
662 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
663 {
664 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
665 struct pci_dev *pdev = adapter->pdev;
666 int size;
667
668 size = sizeof(struct ixgb_buffer) * txdr->count;
669 txdr->buffer_info = vmalloc(size);
670 if (!txdr->buffer_info) {
671 netif_err(adapter, probe, adapter->netdev,
672 "Unable to allocate transmit descriptor ring memory\n");
673 return -ENOMEM;
674 }
675 memset(txdr->buffer_info, 0, size);
676
677 /* round up to nearest 4K */
678
679 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
680 txdr->size = ALIGN(txdr->size, 4096);
681
682 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
683 GFP_KERNEL);
684 if (!txdr->desc) {
685 vfree(txdr->buffer_info);
686 netif_err(adapter, probe, adapter->netdev,
687 "Unable to allocate transmit descriptor memory\n");
688 return -ENOMEM;
689 }
690 memset(txdr->desc, 0, txdr->size);
691
692 txdr->next_to_use = 0;
693 txdr->next_to_clean = 0;
694
695 return 0;
696 }
697
698 /**
699 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
700 * @adapter: board private structure
701 *
702 * Configure the Tx unit of the MAC after a reset.
703 **/
704
705 static void
706 ixgb_configure_tx(struct ixgb_adapter *adapter)
707 {
708 u64 tdba = adapter->tx_ring.dma;
709 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
710 u32 tctl;
711 struct ixgb_hw *hw = &adapter->hw;
712
713 /* Setup the Base and Length of the Tx Descriptor Ring
714 * tx_ring.dma can be either a 32 or 64 bit value
715 */
716
717 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
718 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
719
720 IXGB_WRITE_REG(hw, TDLEN, tdlen);
721
722 /* Setup the HW Tx Head and Tail descriptor pointers */
723
724 IXGB_WRITE_REG(hw, TDH, 0);
725 IXGB_WRITE_REG(hw, TDT, 0);
726
727 /* don't set up txdctl, it induces performance problems if configured
728 * incorrectly */
729 /* Set the Tx Interrupt Delay register */
730
731 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
732
733 /* Program the Transmit Control Register */
734
735 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
736 IXGB_WRITE_REG(hw, TCTL, tctl);
737
738 /* Setup Transmit Descriptor Settings for this adapter */
739 adapter->tx_cmd_type =
740 IXGB_TX_DESC_TYPE |
741 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
742 }
743
744 /**
745 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
746 * @adapter: board private structure
747 *
748 * Returns 0 on success, negative on failure
749 **/
750
751 int
752 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
753 {
754 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
755 struct pci_dev *pdev = adapter->pdev;
756 int size;
757
758 size = sizeof(struct ixgb_buffer) * rxdr->count;
759 rxdr->buffer_info = vmalloc(size);
760 if (!rxdr->buffer_info) {
761 netif_err(adapter, probe, adapter->netdev,
762 "Unable to allocate receive descriptor ring\n");
763 return -ENOMEM;
764 }
765 memset(rxdr->buffer_info, 0, size);
766
767 /* Round up to nearest 4K */
768
769 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
770 rxdr->size = ALIGN(rxdr->size, 4096);
771
772 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
773 GFP_KERNEL);
774
775 if (!rxdr->desc) {
776 vfree(rxdr->buffer_info);
777 netif_err(adapter, probe, adapter->netdev,
778 "Unable to allocate receive descriptors\n");
779 return -ENOMEM;
780 }
781 memset(rxdr->desc, 0, rxdr->size);
782
783 rxdr->next_to_clean = 0;
784 rxdr->next_to_use = 0;
785
786 return 0;
787 }
788
789 /**
790 * ixgb_setup_rctl - configure the receive control register
791 * @adapter: Board private structure
792 **/
793
794 static void
795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
796 {
797 u32 rctl;
798
799 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
800
801 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
802
803 rctl |=
804 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
805 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
806 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
807
808 rctl |= IXGB_RCTL_SECRC;
809
810 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
811 rctl |= IXGB_RCTL_BSIZE_2048;
812 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
813 rctl |= IXGB_RCTL_BSIZE_4096;
814 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
815 rctl |= IXGB_RCTL_BSIZE_8192;
816 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
817 rctl |= IXGB_RCTL_BSIZE_16384;
818
819 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
820 }
821
822 /**
823 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
824 * @adapter: board private structure
825 *
826 * Configure the Rx unit of the MAC after a reset.
827 **/
828
829 static void
830 ixgb_configure_rx(struct ixgb_adapter *adapter)
831 {
832 u64 rdba = adapter->rx_ring.dma;
833 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
834 struct ixgb_hw *hw = &adapter->hw;
835 u32 rctl;
836 u32 rxcsum;
837
838 /* make sure receives are disabled while setting up the descriptors */
839
840 rctl = IXGB_READ_REG(hw, RCTL);
841 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
842
843 /* set the Receive Delay Timer Register */
844
845 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
846
847 /* Setup the Base and Length of the Rx Descriptor Ring */
848
849 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
850 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
851
852 IXGB_WRITE_REG(hw, RDLEN, rdlen);
853
854 /* Setup the HW Rx Head and Tail Descriptor Pointers */
855 IXGB_WRITE_REG(hw, RDH, 0);
856 IXGB_WRITE_REG(hw, RDT, 0);
857
858 /* due to the hardware errata with RXDCTL, we are unable to use any of
859 * the performance enhancing features of it without causing other
860 * subtle bugs, some of the bugs could include receive length
861 * corruption at high data rates (WTHRESH > 0) and/or receive
862 * descriptor ring irregularites (particularly in hardware cache) */
863 IXGB_WRITE_REG(hw, RXDCTL, 0);
864
865 /* Enable Receive Checksum Offload for TCP and UDP */
866 if (adapter->rx_csum) {
867 rxcsum = IXGB_READ_REG(hw, RXCSUM);
868 rxcsum |= IXGB_RXCSUM_TUOFL;
869 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
870 }
871
872 /* Enable Receives */
873
874 IXGB_WRITE_REG(hw, RCTL, rctl);
875 }
876
877 /**
878 * ixgb_free_tx_resources - Free Tx Resources
879 * @adapter: board private structure
880 *
881 * Free all transmit software resources
882 **/
883
884 void
885 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
886 {
887 struct pci_dev *pdev = adapter->pdev;
888
889 ixgb_clean_tx_ring(adapter);
890
891 vfree(adapter->tx_ring.buffer_info);
892 adapter->tx_ring.buffer_info = NULL;
893
894 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
895 adapter->tx_ring.desc, adapter->tx_ring.dma);
896
897 adapter->tx_ring.desc = NULL;
898 }
899
900 static void
901 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
902 struct ixgb_buffer *buffer_info)
903 {
904 if (buffer_info->dma) {
905 if (buffer_info->mapped_as_page)
906 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
907 buffer_info->length, DMA_TO_DEVICE);
908 else
909 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
910 buffer_info->length, DMA_TO_DEVICE);
911 buffer_info->dma = 0;
912 }
913
914 if (buffer_info->skb) {
915 dev_kfree_skb_any(buffer_info->skb);
916 buffer_info->skb = NULL;
917 }
918 buffer_info->time_stamp = 0;
919 /* these fields must always be initialized in tx
920 * buffer_info->length = 0;
921 * buffer_info->next_to_watch = 0; */
922 }
923
924 /**
925 * ixgb_clean_tx_ring - Free Tx Buffers
926 * @adapter: board private structure
927 **/
928
929 static void
930 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
931 {
932 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
933 struct ixgb_buffer *buffer_info;
934 unsigned long size;
935 unsigned int i;
936
937 /* Free all the Tx ring sk_buffs */
938
939 for (i = 0; i < tx_ring->count; i++) {
940 buffer_info = &tx_ring->buffer_info[i];
941 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
942 }
943
944 size = sizeof(struct ixgb_buffer) * tx_ring->count;
945 memset(tx_ring->buffer_info, 0, size);
946
947 /* Zero out the descriptor ring */
948
949 memset(tx_ring->desc, 0, tx_ring->size);
950
951 tx_ring->next_to_use = 0;
952 tx_ring->next_to_clean = 0;
953
954 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
955 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
956 }
957
958 /**
959 * ixgb_free_rx_resources - Free Rx Resources
960 * @adapter: board private structure
961 *
962 * Free all receive software resources
963 **/
964
965 void
966 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
967 {
968 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
969 struct pci_dev *pdev = adapter->pdev;
970
971 ixgb_clean_rx_ring(adapter);
972
973 vfree(rx_ring->buffer_info);
974 rx_ring->buffer_info = NULL;
975
976 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
977 rx_ring->dma);
978
979 rx_ring->desc = NULL;
980 }
981
982 /**
983 * ixgb_clean_rx_ring - Free Rx Buffers
984 * @adapter: board private structure
985 **/
986
987 static void
988 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
989 {
990 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
991 struct ixgb_buffer *buffer_info;
992 struct pci_dev *pdev = adapter->pdev;
993 unsigned long size;
994 unsigned int i;
995
996 /* Free all the Rx ring sk_buffs */
997
998 for (i = 0; i < rx_ring->count; i++) {
999 buffer_info = &rx_ring->buffer_info[i];
1000 if (buffer_info->dma) {
1001 dma_unmap_single(&pdev->dev,
1002 buffer_info->dma,
1003 buffer_info->length,
1004 DMA_FROM_DEVICE);
1005 buffer_info->dma = 0;
1006 buffer_info->length = 0;
1007 }
1008
1009 if (buffer_info->skb) {
1010 dev_kfree_skb(buffer_info->skb);
1011 buffer_info->skb = NULL;
1012 }
1013 }
1014
1015 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1016 memset(rx_ring->buffer_info, 0, size);
1017
1018 /* Zero out the descriptor ring */
1019
1020 memset(rx_ring->desc, 0, rx_ring->size);
1021
1022 rx_ring->next_to_clean = 0;
1023 rx_ring->next_to_use = 0;
1024
1025 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1026 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1027 }
1028
1029 /**
1030 * ixgb_set_mac - Change the Ethernet Address of the NIC
1031 * @netdev: network interface device structure
1032 * @p: pointer to an address structure
1033 *
1034 * Returns 0 on success, negative on failure
1035 **/
1036
1037 static int
1038 ixgb_set_mac(struct net_device *netdev, void *p)
1039 {
1040 struct ixgb_adapter *adapter = netdev_priv(netdev);
1041 struct sockaddr *addr = p;
1042
1043 if (!is_valid_ether_addr(addr->sa_data))
1044 return -EADDRNOTAVAIL;
1045
1046 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1047
1048 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1049
1050 return 0;
1051 }
1052
1053 /**
1054 * ixgb_set_multi - Multicast and Promiscuous mode set
1055 * @netdev: network interface device structure
1056 *
1057 * The set_multi entry point is called whenever the multicast address
1058 * list or the network interface flags are updated. This routine is
1059 * responsible for configuring the hardware for proper multicast,
1060 * promiscuous mode, and all-multi behavior.
1061 **/
1062
1063 static void
1064 ixgb_set_multi(struct net_device *netdev)
1065 {
1066 struct ixgb_adapter *adapter = netdev_priv(netdev);
1067 struct ixgb_hw *hw = &adapter->hw;
1068 struct netdev_hw_addr *ha;
1069 u32 rctl;
1070 int i;
1071
1072 /* Check for Promiscuous and All Multicast modes */
1073
1074 rctl = IXGB_READ_REG(hw, RCTL);
1075
1076 if (netdev->flags & IFF_PROMISC) {
1077 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1078 rctl &= ~IXGB_RCTL_VFE;
1079 } else {
1080 if (netdev->flags & IFF_ALLMULTI) {
1081 rctl |= IXGB_RCTL_MPE;
1082 rctl &= ~IXGB_RCTL_UPE;
1083 } else {
1084 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1085 }
1086 rctl |= IXGB_RCTL_VFE;
1087 }
1088
1089 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1090 rctl |= IXGB_RCTL_MPE;
1091 IXGB_WRITE_REG(hw, RCTL, rctl);
1092 } else {
1093 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1094 IXGB_ETH_LENGTH_OF_ADDRESS];
1095
1096 IXGB_WRITE_REG(hw, RCTL, rctl);
1097
1098 i = 0;
1099 netdev_for_each_mc_addr(ha, netdev)
1100 memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1101 ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1102
1103 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1104 }
1105 }
1106
1107 /**
1108 * ixgb_watchdog - Timer Call-back
1109 * @data: pointer to netdev cast into an unsigned long
1110 **/
1111
1112 static void
1113 ixgb_watchdog(unsigned long data)
1114 {
1115 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1116 struct net_device *netdev = adapter->netdev;
1117 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1118
1119 ixgb_check_for_link(&adapter->hw);
1120
1121 if (ixgb_check_for_bad_link(&adapter->hw)) {
1122 /* force the reset path */
1123 netif_stop_queue(netdev);
1124 }
1125
1126 if (adapter->hw.link_up) {
1127 if (!netif_carrier_ok(netdev)) {
1128 netdev_info(netdev,
1129 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1130 (adapter->hw.fc.type == ixgb_fc_full) ?
1131 "RX/TX" :
1132 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1133 "RX" :
1134 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1135 "TX" : "None");
1136 adapter->link_speed = 10000;
1137 adapter->link_duplex = FULL_DUPLEX;
1138 netif_carrier_on(netdev);
1139 }
1140 } else {
1141 if (netif_carrier_ok(netdev)) {
1142 adapter->link_speed = 0;
1143 adapter->link_duplex = 0;
1144 netdev_info(netdev, "NIC Link is Down\n");
1145 netif_carrier_off(netdev);
1146 }
1147 }
1148
1149 ixgb_update_stats(adapter);
1150
1151 if (!netif_carrier_ok(netdev)) {
1152 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1153 /* We've lost link, so the controller stops DMA,
1154 * but we've got queued Tx work that's never going
1155 * to get done, so reset controller to flush Tx.
1156 * (Do the reset outside of interrupt context). */
1157 schedule_work(&adapter->tx_timeout_task);
1158 /* return immediately since reset is imminent */
1159 return;
1160 }
1161 }
1162
1163 /* Force detection of hung controller every watchdog period */
1164 adapter->detect_tx_hung = true;
1165
1166 /* generate an interrupt to force clean up of any stragglers */
1167 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1168
1169 /* Reset the timer */
1170 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1171 }
1172
1173 #define IXGB_TX_FLAGS_CSUM 0x00000001
1174 #define IXGB_TX_FLAGS_VLAN 0x00000002
1175 #define IXGB_TX_FLAGS_TSO 0x00000004
1176
1177 static int
1178 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1179 {
1180 struct ixgb_context_desc *context_desc;
1181 unsigned int i;
1182 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1183 u16 ipcse, tucse, mss;
1184 int err;
1185
1186 if (likely(skb_is_gso(skb))) {
1187 struct ixgb_buffer *buffer_info;
1188 struct iphdr *iph;
1189
1190 if (skb_header_cloned(skb)) {
1191 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1192 if (err)
1193 return err;
1194 }
1195
1196 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1197 mss = skb_shinfo(skb)->gso_size;
1198 iph = ip_hdr(skb);
1199 iph->tot_len = 0;
1200 iph->check = 0;
1201 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1202 iph->daddr, 0,
1203 IPPROTO_TCP, 0);
1204 ipcss = skb_network_offset(skb);
1205 ipcso = (void *)&(iph->check) - (void *)skb->data;
1206 ipcse = skb_transport_offset(skb) - 1;
1207 tucss = skb_transport_offset(skb);
1208 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1209 tucse = 0;
1210
1211 i = adapter->tx_ring.next_to_use;
1212 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1213 buffer_info = &adapter->tx_ring.buffer_info[i];
1214 WARN_ON(buffer_info->dma != 0);
1215
1216 context_desc->ipcss = ipcss;
1217 context_desc->ipcso = ipcso;
1218 context_desc->ipcse = cpu_to_le16(ipcse);
1219 context_desc->tucss = tucss;
1220 context_desc->tucso = tucso;
1221 context_desc->tucse = cpu_to_le16(tucse);
1222 context_desc->mss = cpu_to_le16(mss);
1223 context_desc->hdr_len = hdr_len;
1224 context_desc->status = 0;
1225 context_desc->cmd_type_len = cpu_to_le32(
1226 IXGB_CONTEXT_DESC_TYPE
1227 | IXGB_CONTEXT_DESC_CMD_TSE
1228 | IXGB_CONTEXT_DESC_CMD_IP
1229 | IXGB_CONTEXT_DESC_CMD_TCP
1230 | IXGB_CONTEXT_DESC_CMD_IDE
1231 | (skb->len - (hdr_len)));
1232
1233
1234 if (++i == adapter->tx_ring.count) i = 0;
1235 adapter->tx_ring.next_to_use = i;
1236
1237 return 1;
1238 }
1239
1240 return 0;
1241 }
1242
1243 static bool
1244 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1245 {
1246 struct ixgb_context_desc *context_desc;
1247 unsigned int i;
1248 u8 css, cso;
1249
1250 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1251 struct ixgb_buffer *buffer_info;
1252 css = skb_transport_offset(skb);
1253 cso = css + skb->csum_offset;
1254
1255 i = adapter->tx_ring.next_to_use;
1256 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1257 buffer_info = &adapter->tx_ring.buffer_info[i];
1258 WARN_ON(buffer_info->dma != 0);
1259
1260 context_desc->tucss = css;
1261 context_desc->tucso = cso;
1262 context_desc->tucse = 0;
1263 /* zero out any previously existing data in one instruction */
1264 *(u32 *)&(context_desc->ipcss) = 0;
1265 context_desc->status = 0;
1266 context_desc->hdr_len = 0;
1267 context_desc->mss = 0;
1268 context_desc->cmd_type_len =
1269 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1270 | IXGB_TX_DESC_CMD_IDE);
1271
1272 if (++i == adapter->tx_ring.count) i = 0;
1273 adapter->tx_ring.next_to_use = i;
1274
1275 return true;
1276 }
1277
1278 return false;
1279 }
1280
1281 #define IXGB_MAX_TXD_PWR 14
1282 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1283
1284 static int
1285 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1286 unsigned int first)
1287 {
1288 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1289 struct pci_dev *pdev = adapter->pdev;
1290 struct ixgb_buffer *buffer_info;
1291 int len = skb_headlen(skb);
1292 unsigned int offset = 0, size, count = 0, i;
1293 unsigned int mss = skb_shinfo(skb)->gso_size;
1294 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1295 unsigned int f;
1296
1297 i = tx_ring->next_to_use;
1298
1299 while (len) {
1300 buffer_info = &tx_ring->buffer_info[i];
1301 size = min(len, IXGB_MAX_DATA_PER_TXD);
1302 /* Workaround for premature desc write-backs
1303 * in TSO mode. Append 4-byte sentinel desc */
1304 if (unlikely(mss && !nr_frags && size == len && size > 8))
1305 size -= 4;
1306
1307 buffer_info->length = size;
1308 WARN_ON(buffer_info->dma != 0);
1309 buffer_info->time_stamp = jiffies;
1310 buffer_info->mapped_as_page = false;
1311 buffer_info->dma = dma_map_single(&pdev->dev,
1312 skb->data + offset,
1313 size, DMA_TO_DEVICE);
1314 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1315 goto dma_error;
1316 buffer_info->next_to_watch = 0;
1317
1318 len -= size;
1319 offset += size;
1320 count++;
1321 if (len) {
1322 i++;
1323 if (i == tx_ring->count)
1324 i = 0;
1325 }
1326 }
1327
1328 for (f = 0; f < nr_frags; f++) {
1329 struct skb_frag_struct *frag;
1330
1331 frag = &skb_shinfo(skb)->frags[f];
1332 len = frag->size;
1333 offset = frag->page_offset;
1334
1335 while (len) {
1336 i++;
1337 if (i == tx_ring->count)
1338 i = 0;
1339
1340 buffer_info = &tx_ring->buffer_info[i];
1341 size = min(len, IXGB_MAX_DATA_PER_TXD);
1342
1343 /* Workaround for premature desc write-backs
1344 * in TSO mode. Append 4-byte sentinel desc */
1345 if (unlikely(mss && (f == (nr_frags - 1))
1346 && size == len && size > 8))
1347 size -= 4;
1348
1349 buffer_info->length = size;
1350 buffer_info->time_stamp = jiffies;
1351 buffer_info->mapped_as_page = true;
1352 buffer_info->dma =
1353 dma_map_page(&pdev->dev, frag->page,
1354 offset, size, DMA_TO_DEVICE);
1355 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1356 goto dma_error;
1357 buffer_info->next_to_watch = 0;
1358
1359 len -= size;
1360 offset += size;
1361 count++;
1362 }
1363 }
1364 tx_ring->buffer_info[i].skb = skb;
1365 tx_ring->buffer_info[first].next_to_watch = i;
1366
1367 return count;
1368
1369 dma_error:
1370 dev_err(&pdev->dev, "TX DMA map failed\n");
1371 buffer_info->dma = 0;
1372 if (count)
1373 count--;
1374
1375 while (count--) {
1376 if (i==0)
1377 i += tx_ring->count;
1378 i--;
1379 buffer_info = &tx_ring->buffer_info[i];
1380 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1381 }
1382
1383 return 0;
1384 }
1385
1386 static void
1387 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1388 {
1389 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1390 struct ixgb_tx_desc *tx_desc = NULL;
1391 struct ixgb_buffer *buffer_info;
1392 u32 cmd_type_len = adapter->tx_cmd_type;
1393 u8 status = 0;
1394 u8 popts = 0;
1395 unsigned int i;
1396
1397 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1398 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1399 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1400 }
1401
1402 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1403 popts |= IXGB_TX_DESC_POPTS_TXSM;
1404
1405 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1406 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1407
1408 i = tx_ring->next_to_use;
1409
1410 while (count--) {
1411 buffer_info = &tx_ring->buffer_info[i];
1412 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1413 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1414 tx_desc->cmd_type_len =
1415 cpu_to_le32(cmd_type_len | buffer_info->length);
1416 tx_desc->status = status;
1417 tx_desc->popts = popts;
1418 tx_desc->vlan = cpu_to_le16(vlan_id);
1419
1420 if (++i == tx_ring->count) i = 0;
1421 }
1422
1423 tx_desc->cmd_type_len |=
1424 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1425
1426 /* Force memory writes to complete before letting h/w
1427 * know there are new descriptors to fetch. (Only
1428 * applicable for weak-ordered memory model archs,
1429 * such as IA-64). */
1430 wmb();
1431
1432 tx_ring->next_to_use = i;
1433 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1434 }
1435
1436 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1437 {
1438 struct ixgb_adapter *adapter = netdev_priv(netdev);
1439 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1440
1441 netif_stop_queue(netdev);
1442 /* Herbert's original patch had:
1443 * smp_mb__after_netif_stop_queue();
1444 * but since that doesn't exist yet, just open code it. */
1445 smp_mb();
1446
1447 /* We need to check again in a case another CPU has just
1448 * made room available. */
1449 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1450 return -EBUSY;
1451
1452 /* A reprieve! */
1453 netif_start_queue(netdev);
1454 ++adapter->restart_queue;
1455 return 0;
1456 }
1457
1458 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1459 struct ixgb_desc_ring *tx_ring, int size)
1460 {
1461 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1462 return 0;
1463 return __ixgb_maybe_stop_tx(netdev, size);
1464 }
1465
1466
1467 /* Tx Descriptors needed, worst case */
1468 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1469 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1470 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1471 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1472 + 1 /* one more needed for sentinel TSO workaround */
1473
1474 static netdev_tx_t
1475 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1476 {
1477 struct ixgb_adapter *adapter = netdev_priv(netdev);
1478 unsigned int first;
1479 unsigned int tx_flags = 0;
1480 int vlan_id = 0;
1481 int count = 0;
1482 int tso;
1483
1484 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1485 dev_kfree_skb(skb);
1486 return NETDEV_TX_OK;
1487 }
1488
1489 if (skb->len <= 0) {
1490 dev_kfree_skb(skb);
1491 return NETDEV_TX_OK;
1492 }
1493
1494 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1495 DESC_NEEDED)))
1496 return NETDEV_TX_BUSY;
1497
1498 if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1499 tx_flags |= IXGB_TX_FLAGS_VLAN;
1500 vlan_id = vlan_tx_tag_get(skb);
1501 }
1502
1503 first = adapter->tx_ring.next_to_use;
1504
1505 tso = ixgb_tso(adapter, skb);
1506 if (tso < 0) {
1507 dev_kfree_skb(skb);
1508 return NETDEV_TX_OK;
1509 }
1510
1511 if (likely(tso))
1512 tx_flags |= IXGB_TX_FLAGS_TSO;
1513 else if (ixgb_tx_csum(adapter, skb))
1514 tx_flags |= IXGB_TX_FLAGS_CSUM;
1515
1516 count = ixgb_tx_map(adapter, skb, first);
1517
1518 if (count) {
1519 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1520 /* Make sure there is space in the ring for the next send. */
1521 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1522
1523 } else {
1524 dev_kfree_skb_any(skb);
1525 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1526 adapter->tx_ring.next_to_use = first;
1527 }
1528
1529 return NETDEV_TX_OK;
1530 }
1531
1532 /**
1533 * ixgb_tx_timeout - Respond to a Tx Hang
1534 * @netdev: network interface device structure
1535 **/
1536
1537 static void
1538 ixgb_tx_timeout(struct net_device *netdev)
1539 {
1540 struct ixgb_adapter *adapter = netdev_priv(netdev);
1541
1542 /* Do the reset outside of interrupt context */
1543 schedule_work(&adapter->tx_timeout_task);
1544 }
1545
1546 static void
1547 ixgb_tx_timeout_task(struct work_struct *work)
1548 {
1549 struct ixgb_adapter *adapter =
1550 container_of(work, struct ixgb_adapter, tx_timeout_task);
1551
1552 adapter->tx_timeout_count++;
1553 ixgb_down(adapter, true);
1554 ixgb_up(adapter);
1555 }
1556
1557 /**
1558 * ixgb_get_stats - Get System Network Statistics
1559 * @netdev: network interface device structure
1560 *
1561 * Returns the address of the device statistics structure.
1562 * The statistics are actually updated from the timer callback.
1563 **/
1564
1565 static struct net_device_stats *
1566 ixgb_get_stats(struct net_device *netdev)
1567 {
1568 return &netdev->stats;
1569 }
1570
1571 /**
1572 * ixgb_change_mtu - Change the Maximum Transfer Unit
1573 * @netdev: network interface device structure
1574 * @new_mtu: new value for maximum frame size
1575 *
1576 * Returns 0 on success, negative on failure
1577 **/
1578
1579 static int
1580 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1581 {
1582 struct ixgb_adapter *adapter = netdev_priv(netdev);
1583 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1584 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1585
1586 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1587 if ((new_mtu < 68) ||
1588 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1589 netif_err(adapter, probe, adapter->netdev,
1590 "Invalid MTU setting %d\n", new_mtu);
1591 return -EINVAL;
1592 }
1593
1594 if (old_max_frame == max_frame)
1595 return 0;
1596
1597 if (netif_running(netdev))
1598 ixgb_down(adapter, true);
1599
1600 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1601
1602 netdev->mtu = new_mtu;
1603
1604 if (netif_running(netdev))
1605 ixgb_up(adapter);
1606
1607 return 0;
1608 }
1609
1610 /**
1611 * ixgb_update_stats - Update the board statistics counters.
1612 * @adapter: board private structure
1613 **/
1614
1615 void
1616 ixgb_update_stats(struct ixgb_adapter *adapter)
1617 {
1618 struct net_device *netdev = adapter->netdev;
1619 struct pci_dev *pdev = adapter->pdev;
1620
1621 /* Prevent stats update while adapter is being reset */
1622 if (pci_channel_offline(pdev))
1623 return;
1624
1625 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1626 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1627 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1628 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1629 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1630 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1631
1632 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1633 /* fix up multicast stats by removing broadcasts */
1634 if (multi >= bcast)
1635 multi -= bcast;
1636
1637 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1638 adapter->stats.mprch += (multi >> 32);
1639 adapter->stats.bprcl += bcast_l;
1640 adapter->stats.bprch += bcast_h;
1641 } else {
1642 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1643 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1644 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1645 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1646 }
1647 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1648 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1649 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1650 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1651 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1652 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1653 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1654 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1655 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1656 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1657 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1658 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1659 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1660 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1661 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1662 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1663 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1664 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1665 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1666 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1667 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1668 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1669 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1670 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1671 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1672 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1673 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1674 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1675 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1676 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1677 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1678 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1679 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1680 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1681 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1682 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1683 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1684 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1685 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1686 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1687 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1688 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1689 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1690 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1691 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1692 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1693 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1694 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1695 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1696 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1697 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1698 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1699 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1700 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1701 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1702 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1703
1704 /* Fill out the OS statistics structure */
1705
1706 netdev->stats.rx_packets = adapter->stats.gprcl;
1707 netdev->stats.tx_packets = adapter->stats.gptcl;
1708 netdev->stats.rx_bytes = adapter->stats.gorcl;
1709 netdev->stats.tx_bytes = adapter->stats.gotcl;
1710 netdev->stats.multicast = adapter->stats.mprcl;
1711 netdev->stats.collisions = 0;
1712
1713 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1714 * with a length in the type/len field */
1715 netdev->stats.rx_errors =
1716 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1717 adapter->stats.ruc +
1718 adapter->stats.roc /*+ adapter->stats.rlec */ +
1719 adapter->stats.icbc +
1720 adapter->stats.ecbc + adapter->stats.mpc;
1721
1722 /* see above
1723 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1724 */
1725
1726 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1727 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1728 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1729 netdev->stats.rx_over_errors = adapter->stats.mpc;
1730
1731 netdev->stats.tx_errors = 0;
1732 netdev->stats.rx_frame_errors = 0;
1733 netdev->stats.tx_aborted_errors = 0;
1734 netdev->stats.tx_carrier_errors = 0;
1735 netdev->stats.tx_fifo_errors = 0;
1736 netdev->stats.tx_heartbeat_errors = 0;
1737 netdev->stats.tx_window_errors = 0;
1738 }
1739
1740 #define IXGB_MAX_INTR 10
1741 /**
1742 * ixgb_intr - Interrupt Handler
1743 * @irq: interrupt number
1744 * @data: pointer to a network interface device structure
1745 **/
1746
1747 static irqreturn_t
1748 ixgb_intr(int irq, void *data)
1749 {
1750 struct net_device *netdev = data;
1751 struct ixgb_adapter *adapter = netdev_priv(netdev);
1752 struct ixgb_hw *hw = &adapter->hw;
1753 u32 icr = IXGB_READ_REG(hw, ICR);
1754
1755 if (unlikely(!icr))
1756 return IRQ_NONE; /* Not our interrupt */
1757
1758 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1759 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1760 mod_timer(&adapter->watchdog_timer, jiffies);
1761
1762 if (napi_schedule_prep(&adapter->napi)) {
1763
1764 /* Disable interrupts and register for poll. The flush
1765 of the posted write is intentionally left out.
1766 */
1767
1768 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1769 __napi_schedule(&adapter->napi);
1770 }
1771 return IRQ_HANDLED;
1772 }
1773
1774 /**
1775 * ixgb_clean - NAPI Rx polling callback
1776 * @adapter: board private structure
1777 **/
1778
1779 static int
1780 ixgb_clean(struct napi_struct *napi, int budget)
1781 {
1782 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1783 int work_done = 0;
1784
1785 ixgb_clean_tx_irq(adapter);
1786 ixgb_clean_rx_irq(adapter, &work_done, budget);
1787
1788 /* If budget not fully consumed, exit the polling mode */
1789 if (work_done < budget) {
1790 napi_complete(napi);
1791 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1792 ixgb_irq_enable(adapter);
1793 }
1794
1795 return work_done;
1796 }
1797
1798 /**
1799 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1800 * @adapter: board private structure
1801 **/
1802
1803 static bool
1804 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1805 {
1806 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1807 struct net_device *netdev = adapter->netdev;
1808 struct ixgb_tx_desc *tx_desc, *eop_desc;
1809 struct ixgb_buffer *buffer_info;
1810 unsigned int i, eop;
1811 bool cleaned = false;
1812
1813 i = tx_ring->next_to_clean;
1814 eop = tx_ring->buffer_info[i].next_to_watch;
1815 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1816
1817 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1818
1819 for (cleaned = false; !cleaned; ) {
1820 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1821 buffer_info = &tx_ring->buffer_info[i];
1822
1823 if (tx_desc->popts &
1824 (IXGB_TX_DESC_POPTS_TXSM |
1825 IXGB_TX_DESC_POPTS_IXSM))
1826 adapter->hw_csum_tx_good++;
1827
1828 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1829
1830 *(u32 *)&(tx_desc->status) = 0;
1831
1832 cleaned = (i == eop);
1833 if (++i == tx_ring->count) i = 0;
1834 }
1835
1836 eop = tx_ring->buffer_info[i].next_to_watch;
1837 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1838 }
1839
1840 tx_ring->next_to_clean = i;
1841
1842 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1843 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1844 /* Make sure that anybody stopping the queue after this
1845 * sees the new next_to_clean. */
1846 smp_mb();
1847
1848 if (netif_queue_stopped(netdev) &&
1849 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1850 netif_wake_queue(netdev);
1851 ++adapter->restart_queue;
1852 }
1853 }
1854
1855 if (adapter->detect_tx_hung) {
1856 /* detect a transmit hang in hardware, this serializes the
1857 * check with the clearing of time_stamp and movement of i */
1858 adapter->detect_tx_hung = false;
1859 if (tx_ring->buffer_info[eop].time_stamp &&
1860 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1861 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1862 IXGB_STATUS_TXOFF)) {
1863 /* detected Tx unit hang */
1864 netif_err(adapter, drv, adapter->netdev,
1865 "Detected Tx Unit Hang\n"
1866 " TDH <%x>\n"
1867 " TDT <%x>\n"
1868 " next_to_use <%x>\n"
1869 " next_to_clean <%x>\n"
1870 "buffer_info[next_to_clean]\n"
1871 " time_stamp <%lx>\n"
1872 " next_to_watch <%x>\n"
1873 " jiffies <%lx>\n"
1874 " next_to_watch.status <%x>\n",
1875 IXGB_READ_REG(&adapter->hw, TDH),
1876 IXGB_READ_REG(&adapter->hw, TDT),
1877 tx_ring->next_to_use,
1878 tx_ring->next_to_clean,
1879 tx_ring->buffer_info[eop].time_stamp,
1880 eop,
1881 jiffies,
1882 eop_desc->status);
1883 netif_stop_queue(netdev);
1884 }
1885 }
1886
1887 return cleaned;
1888 }
1889
1890 /**
1891 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1892 * @adapter: board private structure
1893 * @rx_desc: receive descriptor
1894 * @sk_buff: socket buffer with received data
1895 **/
1896
1897 static void
1898 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1899 struct ixgb_rx_desc *rx_desc,
1900 struct sk_buff *skb)
1901 {
1902 /* Ignore Checksum bit is set OR
1903 * TCP Checksum has not been calculated
1904 */
1905 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1906 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1907 skb->ip_summed = CHECKSUM_NONE;
1908 return;
1909 }
1910
1911 /* At this point we know the hardware did the TCP checksum */
1912 /* now look at the TCP checksum error bit */
1913 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1914 /* let the stack verify checksum errors */
1915 skb->ip_summed = CHECKSUM_NONE;
1916 adapter->hw_csum_rx_error++;
1917 } else {
1918 /* TCP checksum is good */
1919 skb->ip_summed = CHECKSUM_UNNECESSARY;
1920 adapter->hw_csum_rx_good++;
1921 }
1922 }
1923
1924 /*
1925 * this should improve performance for small packets with large amounts
1926 * of reassembly being done in the stack
1927 */
1928 static void ixgb_check_copybreak(struct net_device *netdev,
1929 struct ixgb_buffer *buffer_info,
1930 u32 length, struct sk_buff **skb)
1931 {
1932 struct sk_buff *new_skb;
1933
1934 if (length > copybreak)
1935 return;
1936
1937 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1938 if (!new_skb)
1939 return;
1940
1941 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1942 (*skb)->data - NET_IP_ALIGN,
1943 length + NET_IP_ALIGN);
1944 /* save the skb in buffer_info as good */
1945 buffer_info->skb = *skb;
1946 *skb = new_skb;
1947 }
1948
1949 /**
1950 * ixgb_clean_rx_irq - Send received data up the network stack,
1951 * @adapter: board private structure
1952 **/
1953
1954 static bool
1955 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1956 {
1957 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1958 struct net_device *netdev = adapter->netdev;
1959 struct pci_dev *pdev = adapter->pdev;
1960 struct ixgb_rx_desc *rx_desc, *next_rxd;
1961 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1962 u32 length;
1963 unsigned int i, j;
1964 int cleaned_count = 0;
1965 bool cleaned = false;
1966
1967 i = rx_ring->next_to_clean;
1968 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1969 buffer_info = &rx_ring->buffer_info[i];
1970
1971 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1972 struct sk_buff *skb;
1973 u8 status;
1974
1975 if (*work_done >= work_to_do)
1976 break;
1977
1978 (*work_done)++;
1979 status = rx_desc->status;
1980 skb = buffer_info->skb;
1981 buffer_info->skb = NULL;
1982
1983 prefetch(skb->data - NET_IP_ALIGN);
1984
1985 if (++i == rx_ring->count)
1986 i = 0;
1987 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1988 prefetch(next_rxd);
1989
1990 j = i + 1;
1991 if (j == rx_ring->count)
1992 j = 0;
1993 next2_buffer = &rx_ring->buffer_info[j];
1994 prefetch(next2_buffer);
1995
1996 next_buffer = &rx_ring->buffer_info[i];
1997
1998 cleaned = true;
1999 cleaned_count++;
2000
2001 dma_unmap_single(&pdev->dev,
2002 buffer_info->dma,
2003 buffer_info->length,
2004 DMA_FROM_DEVICE);
2005 buffer_info->dma = 0;
2006
2007 length = le16_to_cpu(rx_desc->length);
2008 rx_desc->length = 0;
2009
2010 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2011
2012 /* All receives must fit into a single buffer */
2013
2014 IXGB_DBG("Receive packet consumed multiple buffers "
2015 "length<%x>\n", length);
2016
2017 dev_kfree_skb_irq(skb);
2018 goto rxdesc_done;
2019 }
2020
2021 if (unlikely(rx_desc->errors &
2022 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2023 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2024 dev_kfree_skb_irq(skb);
2025 goto rxdesc_done;
2026 }
2027
2028 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2029
2030 /* Good Receive */
2031 skb_put(skb, length);
2032
2033 /* Receive Checksum Offload */
2034 ixgb_rx_checksum(adapter, rx_desc, skb);
2035
2036 skb->protocol = eth_type_trans(skb, netdev);
2037 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2038 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2039 le16_to_cpu(rx_desc->special));
2040 } else {
2041 netif_receive_skb(skb);
2042 }
2043
2044 rxdesc_done:
2045 /* clean up descriptor, might be written over by hw */
2046 rx_desc->status = 0;
2047
2048 /* return some buffers to hardware, one at a time is too slow */
2049 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2050 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2051 cleaned_count = 0;
2052 }
2053
2054 /* use prefetched values */
2055 rx_desc = next_rxd;
2056 buffer_info = next_buffer;
2057 }
2058
2059 rx_ring->next_to_clean = i;
2060
2061 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2062 if (cleaned_count)
2063 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2064
2065 return cleaned;
2066 }
2067
2068 /**
2069 * ixgb_alloc_rx_buffers - Replace used receive buffers
2070 * @adapter: address of board private structure
2071 **/
2072
2073 static void
2074 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2075 {
2076 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2077 struct net_device *netdev = adapter->netdev;
2078 struct pci_dev *pdev = adapter->pdev;
2079 struct ixgb_rx_desc *rx_desc;
2080 struct ixgb_buffer *buffer_info;
2081 struct sk_buff *skb;
2082 unsigned int i;
2083 long cleancount;
2084
2085 i = rx_ring->next_to_use;
2086 buffer_info = &rx_ring->buffer_info[i];
2087 cleancount = IXGB_DESC_UNUSED(rx_ring);
2088
2089
2090 /* leave three descriptors unused */
2091 while (--cleancount > 2 && cleaned_count--) {
2092 /* recycle! its good for you */
2093 skb = buffer_info->skb;
2094 if (skb) {
2095 skb_trim(skb, 0);
2096 goto map_skb;
2097 }
2098
2099 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2100 if (unlikely(!skb)) {
2101 /* Better luck next round */
2102 adapter->alloc_rx_buff_failed++;
2103 break;
2104 }
2105
2106 buffer_info->skb = skb;
2107 buffer_info->length = adapter->rx_buffer_len;
2108 map_skb:
2109 buffer_info->dma = dma_map_single(&pdev->dev,
2110 skb->data,
2111 adapter->rx_buffer_len,
2112 DMA_FROM_DEVICE);
2113
2114 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2115 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2116 /* guarantee DD bit not set now before h/w gets descriptor
2117 * this is the rest of the workaround for h/w double
2118 * writeback. */
2119 rx_desc->status = 0;
2120
2121
2122 if (++i == rx_ring->count) i = 0;
2123 buffer_info = &rx_ring->buffer_info[i];
2124 }
2125
2126 if (likely(rx_ring->next_to_use != i)) {
2127 rx_ring->next_to_use = i;
2128 if (unlikely(i-- == 0))
2129 i = (rx_ring->count - 1);
2130
2131 /* Force memory writes to complete before letting h/w
2132 * know there are new descriptors to fetch. (Only
2133 * applicable for weak-ordered memory model archs, such
2134 * as IA-64). */
2135 wmb();
2136 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2137 }
2138 }
2139
2140 /**
2141 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2142 *
2143 * @param netdev network interface device structure
2144 * @param grp indicates to enable or disable tagging/stripping
2145 **/
2146 static void
2147 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2148 {
2149 struct ixgb_adapter *adapter = netdev_priv(netdev);
2150 u32 ctrl, rctl;
2151
2152 ixgb_irq_disable(adapter);
2153 adapter->vlgrp = grp;
2154
2155 if (grp) {
2156 /* enable VLAN tag insert/strip */
2157 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158 ctrl |= IXGB_CTRL0_VME;
2159 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160
2161 /* enable VLAN receive filtering */
2162
2163 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2164 rctl &= ~IXGB_RCTL_CFIEN;
2165 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2166 } else {
2167 /* disable VLAN tag insert/strip */
2168
2169 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170 ctrl &= ~IXGB_CTRL0_VME;
2171 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172 }
2173
2174 /* don't enable interrupts unless we are UP */
2175 if (adapter->netdev->flags & IFF_UP)
2176 ixgb_irq_enable(adapter);
2177 }
2178
2179 static void
2180 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2181 {
2182 struct ixgb_adapter *adapter = netdev_priv(netdev);
2183 u32 vfta, index;
2184
2185 /* add VID to filter table */
2186
2187 index = (vid >> 5) & 0x7F;
2188 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2189 vfta |= (1 << (vid & 0x1F));
2190 ixgb_write_vfta(&adapter->hw, index, vfta);
2191 }
2192
2193 static void
2194 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2195 {
2196 struct ixgb_adapter *adapter = netdev_priv(netdev);
2197 u32 vfta, index;
2198
2199 ixgb_irq_disable(adapter);
2200
2201 vlan_group_set_device(adapter->vlgrp, vid, NULL);
2202
2203 /* don't enable interrupts unless we are UP */
2204 if (adapter->netdev->flags & IFF_UP)
2205 ixgb_irq_enable(adapter);
2206
2207 /* remove VID from filter table */
2208
2209 index = (vid >> 5) & 0x7F;
2210 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2211 vfta &= ~(1 << (vid & 0x1F));
2212 ixgb_write_vfta(&adapter->hw, index, vfta);
2213 }
2214
2215 static void
2216 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2217 {
2218 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2219
2220 if (adapter->vlgrp) {
2221 u16 vid;
2222 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2223 if (!vlan_group_get_device(adapter->vlgrp, vid))
2224 continue;
2225 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2226 }
2227 }
2228 }
2229
2230 #ifdef CONFIG_NET_POLL_CONTROLLER
2231 /*
2232 * Polling 'interrupt' - used by things like netconsole to send skbs
2233 * without having to re-enable interrupts. It's not called while
2234 * the interrupt routine is executing.
2235 */
2236
2237 static void ixgb_netpoll(struct net_device *dev)
2238 {
2239 struct ixgb_adapter *adapter = netdev_priv(dev);
2240
2241 disable_irq(adapter->pdev->irq);
2242 ixgb_intr(adapter->pdev->irq, dev);
2243 enable_irq(adapter->pdev->irq);
2244 }
2245 #endif
2246
2247 /**
2248 * ixgb_io_error_detected() - called when PCI error is detected
2249 * @pdev pointer to pci device with error
2250 * @state pci channel state after error
2251 *
2252 * This callback is called by the PCI subsystem whenever
2253 * a PCI bus error is detected.
2254 */
2255 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2256 enum pci_channel_state state)
2257 {
2258 struct net_device *netdev = pci_get_drvdata(pdev);
2259 struct ixgb_adapter *adapter = netdev_priv(netdev);
2260
2261 netif_device_detach(netdev);
2262
2263 if (state == pci_channel_io_perm_failure)
2264 return PCI_ERS_RESULT_DISCONNECT;
2265
2266 if (netif_running(netdev))
2267 ixgb_down(adapter, true);
2268
2269 pci_disable_device(pdev);
2270
2271 /* Request a slot reset. */
2272 return PCI_ERS_RESULT_NEED_RESET;
2273 }
2274
2275 /**
2276 * ixgb_io_slot_reset - called after the pci bus has been reset.
2277 * @pdev pointer to pci device with error
2278 *
2279 * This callback is called after the PCI bus has been reset.
2280 * Basically, this tries to restart the card from scratch.
2281 * This is a shortened version of the device probe/discovery code,
2282 * it resembles the first-half of the ixgb_probe() routine.
2283 */
2284 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2285 {
2286 struct net_device *netdev = pci_get_drvdata(pdev);
2287 struct ixgb_adapter *adapter = netdev_priv(netdev);
2288
2289 if (pci_enable_device(pdev)) {
2290 netif_err(adapter, probe, adapter->netdev,
2291 "Cannot re-enable PCI device after reset\n");
2292 return PCI_ERS_RESULT_DISCONNECT;
2293 }
2294
2295 /* Perform card reset only on one instance of the card */
2296 if (0 != PCI_FUNC (pdev->devfn))
2297 return PCI_ERS_RESULT_RECOVERED;
2298
2299 pci_set_master(pdev);
2300
2301 netif_carrier_off(netdev);
2302 netif_stop_queue(netdev);
2303 ixgb_reset(adapter);
2304
2305 /* Make sure the EEPROM is good */
2306 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2307 netif_err(adapter, probe, adapter->netdev,
2308 "After reset, the EEPROM checksum is not valid\n");
2309 return PCI_ERS_RESULT_DISCONNECT;
2310 }
2311 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2312 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2313
2314 if (!is_valid_ether_addr(netdev->perm_addr)) {
2315 netif_err(adapter, probe, adapter->netdev,
2316 "After reset, invalid MAC address\n");
2317 return PCI_ERS_RESULT_DISCONNECT;
2318 }
2319
2320 return PCI_ERS_RESULT_RECOVERED;
2321 }
2322
2323 /**
2324 * ixgb_io_resume - called when its OK to resume normal operations
2325 * @pdev pointer to pci device with error
2326 *
2327 * The error recovery driver tells us that its OK to resume
2328 * normal operation. Implementation resembles the second-half
2329 * of the ixgb_probe() routine.
2330 */
2331 static void ixgb_io_resume(struct pci_dev *pdev)
2332 {
2333 struct net_device *netdev = pci_get_drvdata(pdev);
2334 struct ixgb_adapter *adapter = netdev_priv(netdev);
2335
2336 pci_set_master(pdev);
2337
2338 if (netif_running(netdev)) {
2339 if (ixgb_up(adapter)) {
2340 pr_err("can't bring device back up after reset\n");
2341 return;
2342 }
2343 }
2344
2345 netif_device_attach(netdev);
2346 mod_timer(&adapter->watchdog_timer, jiffies);
2347 }
2348
2349 /* ixgb_main.c */
Linux kernel - Deliverables
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