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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31#include <linux/prefetch.h>
32#include "ixgb.h"
33
34char ixgb_driver_name[] = "ixgb";
35static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
36
37#define DRIVERNAPI "-NAPI"
38#define DRV_VERSION "1.0.135-k2" DRIVERNAPI
39const char ixgb_driver_version[] = DRV_VERSION;
40static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
41
42#define IXGB_CB_LENGTH 256
43static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
44module_param(copybreak, uint, 0644);
45MODULE_PARM_DESC(copybreak,
46 "Maximum size of packet that is copied to a new buffer on receive");
47
48/* ixgb_pci_tbl - PCI Device ID Table
49 *
50 * Wildcard entries (PCI_ANY_ID) should come last
51 * Last entry must be all 0s
52 *
53 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
54 * Class, Class Mask, private data (not used) }
55 */
56static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
57 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
58 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
59 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
60 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
61 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
62 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
63 {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
65
66 /* required last entry */
67 {0,}
68};
69
70MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
71
72/* Local Function Prototypes */
73static int ixgb_init_module(void);
74static void ixgb_exit_module(void);
75static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
76static void ixgb_remove(struct pci_dev *pdev);
77static int ixgb_sw_init(struct ixgb_adapter *adapter);
78static int ixgb_open(struct net_device *netdev);
79static int ixgb_close(struct net_device *netdev);
80static void ixgb_configure_tx(struct ixgb_adapter *adapter);
81static void ixgb_configure_rx(struct ixgb_adapter *adapter);
82static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
83static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
84static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
85static void ixgb_set_multi(struct net_device *netdev);
86static void ixgb_watchdog(unsigned long data);
87static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
88 struct net_device *netdev);
89static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
90static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
91static int ixgb_set_mac(struct net_device *netdev, void *p);
92static irqreturn_t ixgb_intr(int irq, void *data);
93static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
94
95static int ixgb_clean(struct napi_struct *, int);
96static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
97static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
98
99static void ixgb_tx_timeout(struct net_device *dev);
100static void ixgb_tx_timeout_task(struct work_struct *work);
101
102static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
103static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
104static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
105 __be16 proto, u16 vid);
106static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
107 __be16 proto, u16 vid);
108static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
109
110#ifdef CONFIG_NET_POLL_CONTROLLER
111/* for netdump / net console */
112static void ixgb_netpoll(struct net_device *dev);
113#endif
114
115static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
116 enum pci_channel_state state);
117static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
118static void ixgb_io_resume (struct pci_dev *pdev);
119
120static const struct pci_error_handlers ixgb_err_handler = {
121 .error_detected = ixgb_io_error_detected,
122 .slot_reset = ixgb_io_slot_reset,
123 .resume = ixgb_io_resume,
124};
125
126static struct pci_driver ixgb_driver = {
127 .name = ixgb_driver_name,
128 .id_table = ixgb_pci_tbl,
129 .probe = ixgb_probe,
130 .remove = ixgb_remove,
131 .err_handler = &ixgb_err_handler
132};
133
134MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
135MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
136MODULE_LICENSE("GPL");
137MODULE_VERSION(DRV_VERSION);
138
139#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
140static int debug = -1;
141module_param(debug, int, 0);
142MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
143
144/**
145 * ixgb_init_module - Driver Registration Routine
146 *
147 * ixgb_init_module is the first routine called when the driver is
148 * loaded. All it does is register with the PCI subsystem.
149 **/
150
151static int __init
152ixgb_init_module(void)
153{
154 pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
155 pr_info("%s\n", ixgb_copyright);
156
157 return pci_register_driver(&ixgb_driver);
158}
159
160module_init(ixgb_init_module);
161
162/**
163 * ixgb_exit_module - Driver Exit Cleanup Routine
164 *
165 * ixgb_exit_module is called just before the driver is removed
166 * from memory.
167 **/
168
169static void __exit
170ixgb_exit_module(void)
171{
172 pci_unregister_driver(&ixgb_driver);
173}
174
175module_exit(ixgb_exit_module);
176
177/**
178 * ixgb_irq_disable - Mask off interrupt generation on the NIC
179 * @adapter: board private structure
180 **/
181
182static void
183ixgb_irq_disable(struct ixgb_adapter *adapter)
184{
185 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
186 IXGB_WRITE_FLUSH(&adapter->hw);
187 synchronize_irq(adapter->pdev->irq);
188}
189
190/**
191 * ixgb_irq_enable - Enable default interrupt generation settings
192 * @adapter: board private structure
193 **/
194
195static void
196ixgb_irq_enable(struct ixgb_adapter *adapter)
197{
198 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
199 IXGB_INT_TXDW | IXGB_INT_LSC;
200 if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
201 val |= IXGB_INT_GPI0;
202 IXGB_WRITE_REG(&adapter->hw, IMS, val);
203 IXGB_WRITE_FLUSH(&adapter->hw);
204}
205
206int
207ixgb_up(struct ixgb_adapter *adapter)
208{
209 struct net_device *netdev = adapter->netdev;
210 int err, irq_flags = IRQF_SHARED;
211 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
212 struct ixgb_hw *hw = &adapter->hw;
213
214 /* hardware has been reset, we need to reload some things */
215
216 ixgb_rar_set(hw, netdev->dev_addr, 0);
217 ixgb_set_multi(netdev);
218
219 ixgb_restore_vlan(adapter);
220
221 ixgb_configure_tx(adapter);
222 ixgb_setup_rctl(adapter);
223 ixgb_configure_rx(adapter);
224 ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
225
226 /* disable interrupts and get the hardware into a known state */
227 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
228
229 /* only enable MSI if bus is in PCI-X mode */
230 if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
231 err = pci_enable_msi(adapter->pdev);
232 if (!err) {
233 adapter->have_msi = true;
234 irq_flags = 0;
235 }
236 /* proceed to try to request regular interrupt */
237 }
238
239 err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
240 netdev->name, netdev);
241 if (err) {
242 if (adapter->have_msi)
243 pci_disable_msi(adapter->pdev);
244 netif_err(adapter, probe, adapter->netdev,
245 "Unable to allocate interrupt Error: %d\n", err);
246 return err;
247 }
248
249 if ((hw->max_frame_size != max_frame) ||
250 (hw->max_frame_size !=
251 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
252
253 hw->max_frame_size = max_frame;
254
255 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
256
257 if (hw->max_frame_size >
258 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
259 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
260
261 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
262 ctrl0 |= IXGB_CTRL0_JFE;
263 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
264 }
265 }
266 }
267
268 clear_bit(__IXGB_DOWN, &adapter->flags);
269
270 napi_enable(&adapter->napi);
271 ixgb_irq_enable(adapter);
272
273 netif_wake_queue(netdev);
274
275 mod_timer(&adapter->watchdog_timer, jiffies);
276
277 return 0;
278}
279
280void
281ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
282{
283 struct net_device *netdev = adapter->netdev;
284
285 /* prevent the interrupt handler from restarting watchdog */
286 set_bit(__IXGB_DOWN, &adapter->flags);
287
288 napi_disable(&adapter->napi);
289 /* waiting for NAPI to complete can re-enable interrupts */
290 ixgb_irq_disable(adapter);
291 free_irq(adapter->pdev->irq, netdev);
292
293 if (adapter->have_msi)
294 pci_disable_msi(adapter->pdev);
295
296 if (kill_watchdog)
297 del_timer_sync(&adapter->watchdog_timer);
298
299 adapter->link_speed = 0;
300 adapter->link_duplex = 0;
301 netif_carrier_off(netdev);
302 netif_stop_queue(netdev);
303
304 ixgb_reset(adapter);
305 ixgb_clean_tx_ring(adapter);
306 ixgb_clean_rx_ring(adapter);
307}
308
309void
310ixgb_reset(struct ixgb_adapter *adapter)
311{
312 struct ixgb_hw *hw = &adapter->hw;
313
314 ixgb_adapter_stop(hw);
315 if (!ixgb_init_hw(hw))
316 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
317
318 /* restore frame size information */
319 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
320 if (hw->max_frame_size >
321 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
322 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
323 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
324 ctrl0 |= IXGB_CTRL0_JFE;
325 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
326 }
327 }
328}
329
330static netdev_features_t
331ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
332{
333 /*
334 * Tx VLAN insertion does not work per HW design when Rx stripping is
335 * disabled.
336 */
337 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
338 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
339
340 return features;
341}
342
343static int
344ixgb_set_features(struct net_device *netdev, netdev_features_t features)
345{
346 struct ixgb_adapter *adapter = netdev_priv(netdev);
347 netdev_features_t changed = features ^ netdev->features;
348
349 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
350 return 0;
351
352 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
353
354 if (netif_running(netdev)) {
355 ixgb_down(adapter, true);
356 ixgb_up(adapter);
357 ixgb_set_speed_duplex(netdev);
358 } else
359 ixgb_reset(adapter);
360
361 return 0;
362}
363
364
365static const struct net_device_ops ixgb_netdev_ops = {
366 .ndo_open = ixgb_open,
367 .ndo_stop = ixgb_close,
368 .ndo_start_xmit = ixgb_xmit_frame,
369 .ndo_get_stats = ixgb_get_stats,
370 .ndo_set_rx_mode = ixgb_set_multi,
371 .ndo_validate_addr = eth_validate_addr,
372 .ndo_set_mac_address = ixgb_set_mac,
373 .ndo_change_mtu = ixgb_change_mtu,
374 .ndo_tx_timeout = ixgb_tx_timeout,
375 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
376 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
377#ifdef CONFIG_NET_POLL_CONTROLLER
378 .ndo_poll_controller = ixgb_netpoll,
379#endif
380 .ndo_fix_features = ixgb_fix_features,
381 .ndo_set_features = ixgb_set_features,
382};
383
384/**
385 * ixgb_probe - Device Initialization Routine
386 * @pdev: PCI device information struct
387 * @ent: entry in ixgb_pci_tbl
388 *
389 * Returns 0 on success, negative on failure
390 *
391 * ixgb_probe initializes an adapter identified by a pci_dev structure.
392 * The OS initialization, configuring of the adapter private structure,
393 * and a hardware reset occur.
394 **/
395
396static int
397ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
398{
399 struct net_device *netdev = NULL;
400 struct ixgb_adapter *adapter;
401 static int cards_found = 0;
402 int pci_using_dac;
403 int i;
404 int err;
405
406 err = pci_enable_device(pdev);
407 if (err)
408 return err;
409
410 pci_using_dac = 0;
411 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
412 if (!err) {
413 pci_using_dac = 1;
414 } else {
415 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
416 if (err) {
417 pr_err("No usable DMA configuration, aborting\n");
418 goto err_dma_mask;
419 }
420 }
421
422 err = pci_request_regions(pdev, ixgb_driver_name);
423 if (err)
424 goto err_request_regions;
425
426 pci_set_master(pdev);
427
428 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
429 if (!netdev) {
430 err = -ENOMEM;
431 goto err_alloc_etherdev;
432 }
433
434 SET_NETDEV_DEV(netdev, &pdev->dev);
435
436 pci_set_drvdata(pdev, netdev);
437 adapter = netdev_priv(netdev);
438 adapter->netdev = netdev;
439 adapter->pdev = pdev;
440 adapter->hw.back = adapter;
441 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
442
443 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
444 if (!adapter->hw.hw_addr) {
445 err = -EIO;
446 goto err_ioremap;
447 }
448
449 for (i = BAR_1; i <= BAR_5; i++) {
450 if (pci_resource_len(pdev, i) == 0)
451 continue;
452 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
453 adapter->hw.io_base = pci_resource_start(pdev, i);
454 break;
455 }
456 }
457
458 netdev->netdev_ops = &ixgb_netdev_ops;
459 ixgb_set_ethtool_ops(netdev);
460 netdev->watchdog_timeo = 5 * HZ;
461 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
462
463 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
464
465 adapter->bd_number = cards_found;
466 adapter->link_speed = 0;
467 adapter->link_duplex = 0;
468
469 /* setup the private structure */
470
471 err = ixgb_sw_init(adapter);
472 if (err)
473 goto err_sw_init;
474
475 netdev->hw_features = NETIF_F_SG |
476 NETIF_F_TSO |
477 NETIF_F_HW_CSUM |
478 NETIF_F_HW_VLAN_CTAG_TX |
479 NETIF_F_HW_VLAN_CTAG_RX;
480 netdev->features = netdev->hw_features |
481 NETIF_F_HW_VLAN_CTAG_FILTER;
482 netdev->hw_features |= NETIF_F_RXCSUM;
483
484 if (pci_using_dac) {
485 netdev->features |= NETIF_F_HIGHDMA;
486 netdev->vlan_features |= NETIF_F_HIGHDMA;
487 }
488
489 /* make sure the EEPROM is good */
490
491 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
492 netif_err(adapter, probe, adapter->netdev,
493 "The EEPROM Checksum Is Not Valid\n");
494 err = -EIO;
495 goto err_eeprom;
496 }
497
498 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
499
500 if (!is_valid_ether_addr(netdev->dev_addr)) {
501 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
502 err = -EIO;
503 goto err_eeprom;
504 }
505
506 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
507
508 init_timer(&adapter->watchdog_timer);
509 adapter->watchdog_timer.function = ixgb_watchdog;
510 adapter->watchdog_timer.data = (unsigned long)adapter;
511
512 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
513
514 strcpy(netdev->name, "eth%d");
515 err = register_netdev(netdev);
516 if (err)
517 goto err_register;
518
519 /* carrier off reporting is important to ethtool even BEFORE open */
520 netif_carrier_off(netdev);
521
522 netif_info(adapter, probe, adapter->netdev,
523 "Intel(R) PRO/10GbE Network Connection\n");
524 ixgb_check_options(adapter);
525 /* reset the hardware with the new settings */
526
527 ixgb_reset(adapter);
528
529 cards_found++;
530 return 0;
531
532err_register:
533err_sw_init:
534err_eeprom:
535 iounmap(adapter->hw.hw_addr);
536err_ioremap:
537 free_netdev(netdev);
538err_alloc_etherdev:
539 pci_release_regions(pdev);
540err_request_regions:
541err_dma_mask:
542 pci_disable_device(pdev);
543 return err;
544}
545
546/**
547 * ixgb_remove - Device Removal Routine
548 * @pdev: PCI device information struct
549 *
550 * ixgb_remove is called by the PCI subsystem to alert the driver
551 * that it should release a PCI device. The could be caused by a
552 * Hot-Plug event, or because the driver is going to be removed from
553 * memory.
554 **/
555
556static void
557ixgb_remove(struct pci_dev *pdev)
558{
559 struct net_device *netdev = pci_get_drvdata(pdev);
560 struct ixgb_adapter *adapter = netdev_priv(netdev);
561
562 cancel_work_sync(&adapter->tx_timeout_task);
563
564 unregister_netdev(netdev);
565
566 iounmap(adapter->hw.hw_addr);
567 pci_release_regions(pdev);
568
569 free_netdev(netdev);
570 pci_disable_device(pdev);
571}
572
573/**
574 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
575 * @adapter: board private structure to initialize
576 *
577 * ixgb_sw_init initializes the Adapter private data structure.
578 * Fields are initialized based on PCI device information and
579 * OS network device settings (MTU size).
580 **/
581
582static int
583ixgb_sw_init(struct ixgb_adapter *adapter)
584{
585 struct ixgb_hw *hw = &adapter->hw;
586 struct net_device *netdev = adapter->netdev;
587 struct pci_dev *pdev = adapter->pdev;
588
589 /* PCI config space info */
590
591 hw->vendor_id = pdev->vendor;
592 hw->device_id = pdev->device;
593 hw->subsystem_vendor_id = pdev->subsystem_vendor;
594 hw->subsystem_id = pdev->subsystem_device;
595
596 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
597 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
598
599 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
600 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
601 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
602 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
603 hw->mac_type = ixgb_82597;
604 else {
605 /* should never have loaded on this device */
606 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
607 }
608
609 /* enable flow control to be programmed */
610 hw->fc.send_xon = 1;
611
612 set_bit(__IXGB_DOWN, &adapter->flags);
613 return 0;
614}
615
616/**
617 * ixgb_open - Called when a network interface is made active
618 * @netdev: network interface device structure
619 *
620 * Returns 0 on success, negative value on failure
621 *
622 * The open entry point is called when a network interface is made
623 * active by the system (IFF_UP). At this point all resources needed
624 * for transmit and receive operations are allocated, the interrupt
625 * handler is registered with the OS, the watchdog timer is started,
626 * and the stack is notified that the interface is ready.
627 **/
628
629static int
630ixgb_open(struct net_device *netdev)
631{
632 struct ixgb_adapter *adapter = netdev_priv(netdev);
633 int err;
634
635 /* allocate transmit descriptors */
636 err = ixgb_setup_tx_resources(adapter);
637 if (err)
638 goto err_setup_tx;
639
640 netif_carrier_off(netdev);
641
642 /* allocate receive descriptors */
643
644 err = ixgb_setup_rx_resources(adapter);
645 if (err)
646 goto err_setup_rx;
647
648 err = ixgb_up(adapter);
649 if (err)
650 goto err_up;
651
652 netif_start_queue(netdev);
653
654 return 0;
655
656err_up:
657 ixgb_free_rx_resources(adapter);
658err_setup_rx:
659 ixgb_free_tx_resources(adapter);
660err_setup_tx:
661 ixgb_reset(adapter);
662
663 return err;
664}
665
666/**
667 * ixgb_close - Disables a network interface
668 * @netdev: network interface device structure
669 *
670 * Returns 0, this is not allowed to fail
671 *
672 * The close entry point is called when an interface is de-activated
673 * by the OS. The hardware is still under the drivers control, but
674 * needs to be disabled. A global MAC reset is issued to stop the
675 * hardware, and all transmit and receive resources are freed.
676 **/
677
678static int
679ixgb_close(struct net_device *netdev)
680{
681 struct ixgb_adapter *adapter = netdev_priv(netdev);
682
683 ixgb_down(adapter, true);
684
685 ixgb_free_tx_resources(adapter);
686 ixgb_free_rx_resources(adapter);
687
688 return 0;
689}
690
691/**
692 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
693 * @adapter: board private structure
694 *
695 * Return 0 on success, negative on failure
696 **/
697
698int
699ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
700{
701 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
702 struct pci_dev *pdev = adapter->pdev;
703 int size;
704
705 size = sizeof(struct ixgb_buffer) * txdr->count;
706 txdr->buffer_info = vzalloc(size);
707 if (!txdr->buffer_info)
708 return -ENOMEM;
709
710 /* round up to nearest 4K */
711
712 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
713 txdr->size = ALIGN(txdr->size, 4096);
714
715 txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
716 GFP_KERNEL);
717 if (!txdr->desc) {
718 vfree(txdr->buffer_info);
719 return -ENOMEM;
720 }
721
722 txdr->next_to_use = 0;
723 txdr->next_to_clean = 0;
724
725 return 0;
726}
727
728/**
729 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
730 * @adapter: board private structure
731 *
732 * Configure the Tx unit of the MAC after a reset.
733 **/
734
735static void
736ixgb_configure_tx(struct ixgb_adapter *adapter)
737{
738 u64 tdba = adapter->tx_ring.dma;
739 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
740 u32 tctl;
741 struct ixgb_hw *hw = &adapter->hw;
742
743 /* Setup the Base and Length of the Tx Descriptor Ring
744 * tx_ring.dma can be either a 32 or 64 bit value
745 */
746
747 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
748 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
749
750 IXGB_WRITE_REG(hw, TDLEN, tdlen);
751
752 /* Setup the HW Tx Head and Tail descriptor pointers */
753
754 IXGB_WRITE_REG(hw, TDH, 0);
755 IXGB_WRITE_REG(hw, TDT, 0);
756
757 /* don't set up txdctl, it induces performance problems if configured
758 * incorrectly */
759 /* Set the Tx Interrupt Delay register */
760
761 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
762
763 /* Program the Transmit Control Register */
764
765 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
766 IXGB_WRITE_REG(hw, TCTL, tctl);
767
768 /* Setup Transmit Descriptor Settings for this adapter */
769 adapter->tx_cmd_type =
770 IXGB_TX_DESC_TYPE |
771 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
772}
773
774/**
775 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
776 * @adapter: board private structure
777 *
778 * Returns 0 on success, negative on failure
779 **/
780
781int
782ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
783{
784 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
785 struct pci_dev *pdev = adapter->pdev;
786 int size;
787
788 size = sizeof(struct ixgb_buffer) * rxdr->count;
789 rxdr->buffer_info = vzalloc(size);
790 if (!rxdr->buffer_info)
791 return -ENOMEM;
792
793 /* Round up to nearest 4K */
794
795 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
796 rxdr->size = ALIGN(rxdr->size, 4096);
797
798 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
799 GFP_KERNEL);
800
801 if (!rxdr->desc) {
802 vfree(rxdr->buffer_info);
803 return -ENOMEM;
804 }
805 memset(rxdr->desc, 0, rxdr->size);
806
807 rxdr->next_to_clean = 0;
808 rxdr->next_to_use = 0;
809
810 return 0;
811}
812
813/**
814 * ixgb_setup_rctl - configure the receive control register
815 * @adapter: Board private structure
816 **/
817
818static void
819ixgb_setup_rctl(struct ixgb_adapter *adapter)
820{
821 u32 rctl;
822
823 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
824
825 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
826
827 rctl |=
828 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
829 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
830 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
831
832 rctl |= IXGB_RCTL_SECRC;
833
834 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
835 rctl |= IXGB_RCTL_BSIZE_2048;
836 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
837 rctl |= IXGB_RCTL_BSIZE_4096;
838 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
839 rctl |= IXGB_RCTL_BSIZE_8192;
840 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
841 rctl |= IXGB_RCTL_BSIZE_16384;
842
843 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
844}
845
846/**
847 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
848 * @adapter: board private structure
849 *
850 * Configure the Rx unit of the MAC after a reset.
851 **/
852
853static void
854ixgb_configure_rx(struct ixgb_adapter *adapter)
855{
856 u64 rdba = adapter->rx_ring.dma;
857 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
858 struct ixgb_hw *hw = &adapter->hw;
859 u32 rctl;
860 u32 rxcsum;
861
862 /* make sure receives are disabled while setting up the descriptors */
863
864 rctl = IXGB_READ_REG(hw, RCTL);
865 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
866
867 /* set the Receive Delay Timer Register */
868
869 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
870
871 /* Setup the Base and Length of the Rx Descriptor Ring */
872
873 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
874 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
875
876 IXGB_WRITE_REG(hw, RDLEN, rdlen);
877
878 /* Setup the HW Rx Head and Tail Descriptor Pointers */
879 IXGB_WRITE_REG(hw, RDH, 0);
880 IXGB_WRITE_REG(hw, RDT, 0);
881
882 /* due to the hardware errata with RXDCTL, we are unable to use any of
883 * the performance enhancing features of it without causing other
884 * subtle bugs, some of the bugs could include receive length
885 * corruption at high data rates (WTHRESH > 0) and/or receive
886 * descriptor ring irregularites (particularly in hardware cache) */
887 IXGB_WRITE_REG(hw, RXDCTL, 0);
888
889 /* Enable Receive Checksum Offload for TCP and UDP */
890 if (adapter->rx_csum) {
891 rxcsum = IXGB_READ_REG(hw, RXCSUM);
892 rxcsum |= IXGB_RXCSUM_TUOFL;
893 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
894 }
895
896 /* Enable Receives */
897
898 IXGB_WRITE_REG(hw, RCTL, rctl);
899}
900
901/**
902 * ixgb_free_tx_resources - Free Tx Resources
903 * @adapter: board private structure
904 *
905 * Free all transmit software resources
906 **/
907
908void
909ixgb_free_tx_resources(struct ixgb_adapter *adapter)
910{
911 struct pci_dev *pdev = adapter->pdev;
912
913 ixgb_clean_tx_ring(adapter);
914
915 vfree(adapter->tx_ring.buffer_info);
916 adapter->tx_ring.buffer_info = NULL;
917
918 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
919 adapter->tx_ring.desc, adapter->tx_ring.dma);
920
921 adapter->tx_ring.desc = NULL;
922}
923
924static void
925ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
926 struct ixgb_buffer *buffer_info)
927{
928 if (buffer_info->dma) {
929 if (buffer_info->mapped_as_page)
930 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
931 buffer_info->length, DMA_TO_DEVICE);
932 else
933 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
934 buffer_info->length, DMA_TO_DEVICE);
935 buffer_info->dma = 0;
936 }
937
938 if (buffer_info->skb) {
939 dev_kfree_skb_any(buffer_info->skb);
940 buffer_info->skb = NULL;
941 }
942 buffer_info->time_stamp = 0;
943 /* these fields must always be initialized in tx
944 * buffer_info->length = 0;
945 * buffer_info->next_to_watch = 0; */
946}
947
948/**
949 * ixgb_clean_tx_ring - Free Tx Buffers
950 * @adapter: board private structure
951 **/
952
953static void
954ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
955{
956 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
957 struct ixgb_buffer *buffer_info;
958 unsigned long size;
959 unsigned int i;
960
961 /* Free all the Tx ring sk_buffs */
962
963 for (i = 0; i < tx_ring->count; i++) {
964 buffer_info = &tx_ring->buffer_info[i];
965 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
966 }
967
968 size = sizeof(struct ixgb_buffer) * tx_ring->count;
969 memset(tx_ring->buffer_info, 0, size);
970
971 /* Zero out the descriptor ring */
972
973 memset(tx_ring->desc, 0, tx_ring->size);
974
975 tx_ring->next_to_use = 0;
976 tx_ring->next_to_clean = 0;
977
978 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
979 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
980}
981
982/**
983 * ixgb_free_rx_resources - Free Rx Resources
984 * @adapter: board private structure
985 *
986 * Free all receive software resources
987 **/
988
989void
990ixgb_free_rx_resources(struct ixgb_adapter *adapter)
991{
992 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
993 struct pci_dev *pdev = adapter->pdev;
994
995 ixgb_clean_rx_ring(adapter);
996
997 vfree(rx_ring->buffer_info);
998 rx_ring->buffer_info = NULL;
999
1000 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1001 rx_ring->dma);
1002
1003 rx_ring->desc = NULL;
1004}
1005
1006/**
1007 * ixgb_clean_rx_ring - Free Rx Buffers
1008 * @adapter: board private structure
1009 **/
1010
1011static void
1012ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1013{
1014 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1015 struct ixgb_buffer *buffer_info;
1016 struct pci_dev *pdev = adapter->pdev;
1017 unsigned long size;
1018 unsigned int i;
1019
1020 /* Free all the Rx ring sk_buffs */
1021
1022 for (i = 0; i < rx_ring->count; i++) {
1023 buffer_info = &rx_ring->buffer_info[i];
1024 if (buffer_info->dma) {
1025 dma_unmap_single(&pdev->dev,
1026 buffer_info->dma,
1027 buffer_info->length,
1028 DMA_FROM_DEVICE);
1029 buffer_info->dma = 0;
1030 buffer_info->length = 0;
1031 }
1032
1033 if (buffer_info->skb) {
1034 dev_kfree_skb(buffer_info->skb);
1035 buffer_info->skb = NULL;
1036 }
1037 }
1038
1039 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1040 memset(rx_ring->buffer_info, 0, size);
1041
1042 /* Zero out the descriptor ring */
1043
1044 memset(rx_ring->desc, 0, rx_ring->size);
1045
1046 rx_ring->next_to_clean = 0;
1047 rx_ring->next_to_use = 0;
1048
1049 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1050 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1051}
1052
1053/**
1054 * ixgb_set_mac - Change the Ethernet Address of the NIC
1055 * @netdev: network interface device structure
1056 * @p: pointer to an address structure
1057 *
1058 * Returns 0 on success, negative on failure
1059 **/
1060
1061static int
1062ixgb_set_mac(struct net_device *netdev, void *p)
1063{
1064 struct ixgb_adapter *adapter = netdev_priv(netdev);
1065 struct sockaddr *addr = p;
1066
1067 if (!is_valid_ether_addr(addr->sa_data))
1068 return -EADDRNOTAVAIL;
1069
1070 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1071
1072 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1073
1074 return 0;
1075}
1076
1077/**
1078 * ixgb_set_multi - Multicast and Promiscuous mode set
1079 * @netdev: network interface device structure
1080 *
1081 * The set_multi entry point is called whenever the multicast address
1082 * list or the network interface flags are updated. This routine is
1083 * responsible for configuring the hardware for proper multicast,
1084 * promiscuous mode, and all-multi behavior.
1085 **/
1086
1087static void
1088ixgb_set_multi(struct net_device *netdev)
1089{
1090 struct ixgb_adapter *adapter = netdev_priv(netdev);
1091 struct ixgb_hw *hw = &adapter->hw;
1092 struct netdev_hw_addr *ha;
1093 u32 rctl;
1094
1095 /* Check for Promiscuous and All Multicast modes */
1096
1097 rctl = IXGB_READ_REG(hw, RCTL);
1098
1099 if (netdev->flags & IFF_PROMISC) {
1100 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1101 /* disable VLAN filtering */
1102 rctl &= ~IXGB_RCTL_CFIEN;
1103 rctl &= ~IXGB_RCTL_VFE;
1104 } else {
1105 if (netdev->flags & IFF_ALLMULTI) {
1106 rctl |= IXGB_RCTL_MPE;
1107 rctl &= ~IXGB_RCTL_UPE;
1108 } else {
1109 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1110 }
1111 /* enable VLAN filtering */
1112 rctl |= IXGB_RCTL_VFE;
1113 rctl &= ~IXGB_RCTL_CFIEN;
1114 }
1115
1116 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1117 rctl |= IXGB_RCTL_MPE;
1118 IXGB_WRITE_REG(hw, RCTL, rctl);
1119 } else {
1120 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1121 ETH_ALEN, GFP_ATOMIC);
1122 u8 *addr;
1123 if (!mta)
1124 goto alloc_failed;
1125
1126 IXGB_WRITE_REG(hw, RCTL, rctl);
1127
1128 addr = mta;
1129 netdev_for_each_mc_addr(ha, netdev) {
1130 memcpy(addr, ha->addr, ETH_ALEN);
1131 addr += ETH_ALEN;
1132 }
1133
1134 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1135 kfree(mta);
1136 }
1137
1138alloc_failed:
1139 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1140 ixgb_vlan_strip_enable(adapter);
1141 else
1142 ixgb_vlan_strip_disable(adapter);
1143
1144}
1145
1146/**
1147 * ixgb_watchdog - Timer Call-back
1148 * @data: pointer to netdev cast into an unsigned long
1149 **/
1150
1151static void
1152ixgb_watchdog(unsigned long data)
1153{
1154 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1155 struct net_device *netdev = adapter->netdev;
1156 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1157
1158 ixgb_check_for_link(&adapter->hw);
1159
1160 if (ixgb_check_for_bad_link(&adapter->hw)) {
1161 /* force the reset path */
1162 netif_stop_queue(netdev);
1163 }
1164
1165 if (adapter->hw.link_up) {
1166 if (!netif_carrier_ok(netdev)) {
1167 netdev_info(netdev,
1168 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1169 (adapter->hw.fc.type == ixgb_fc_full) ?
1170 "RX/TX" :
1171 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1172 "RX" :
1173 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1174 "TX" : "None");
1175 adapter->link_speed = 10000;
1176 adapter->link_duplex = FULL_DUPLEX;
1177 netif_carrier_on(netdev);
1178 }
1179 } else {
1180 if (netif_carrier_ok(netdev)) {
1181 adapter->link_speed = 0;
1182 adapter->link_duplex = 0;
1183 netdev_info(netdev, "NIC Link is Down\n");
1184 netif_carrier_off(netdev);
1185 }
1186 }
1187
1188 ixgb_update_stats(adapter);
1189
1190 if (!netif_carrier_ok(netdev)) {
1191 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1192 /* We've lost link, so the controller stops DMA,
1193 * but we've got queued Tx work that's never going
1194 * to get done, so reset controller to flush Tx.
1195 * (Do the reset outside of interrupt context). */
1196 schedule_work(&adapter->tx_timeout_task);
1197 /* return immediately since reset is imminent */
1198 return;
1199 }
1200 }
1201
1202 /* Force detection of hung controller every watchdog period */
1203 adapter->detect_tx_hung = true;
1204
1205 /* generate an interrupt to force clean up of any stragglers */
1206 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1207
1208 /* Reset the timer */
1209 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1210}
1211
1212#define IXGB_TX_FLAGS_CSUM 0x00000001
1213#define IXGB_TX_FLAGS_VLAN 0x00000002
1214#define IXGB_TX_FLAGS_TSO 0x00000004
1215
1216static int
1217ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1218{
1219 struct ixgb_context_desc *context_desc;
1220 unsigned int i;
1221 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1222 u16 ipcse, tucse, mss;
1223
1224 if (likely(skb_is_gso(skb))) {
1225 struct ixgb_buffer *buffer_info;
1226 struct iphdr *iph;
1227 int err;
1228
1229 err = skb_cow_head(skb, 0);
1230 if (err < 0)
1231 return err;
1232
1233 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1234 mss = skb_shinfo(skb)->gso_size;
1235 iph = ip_hdr(skb);
1236 iph->tot_len = 0;
1237 iph->check = 0;
1238 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1239 iph->daddr, 0,
1240 IPPROTO_TCP, 0);
1241 ipcss = skb_network_offset(skb);
1242 ipcso = (void *)&(iph->check) - (void *)skb->data;
1243 ipcse = skb_transport_offset(skb) - 1;
1244 tucss = skb_transport_offset(skb);
1245 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1246 tucse = 0;
1247
1248 i = adapter->tx_ring.next_to_use;
1249 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1250 buffer_info = &adapter->tx_ring.buffer_info[i];
1251 WARN_ON(buffer_info->dma != 0);
1252
1253 context_desc->ipcss = ipcss;
1254 context_desc->ipcso = ipcso;
1255 context_desc->ipcse = cpu_to_le16(ipcse);
1256 context_desc->tucss = tucss;
1257 context_desc->tucso = tucso;
1258 context_desc->tucse = cpu_to_le16(tucse);
1259 context_desc->mss = cpu_to_le16(mss);
1260 context_desc->hdr_len = hdr_len;
1261 context_desc->status = 0;
1262 context_desc->cmd_type_len = cpu_to_le32(
1263 IXGB_CONTEXT_DESC_TYPE
1264 | IXGB_CONTEXT_DESC_CMD_TSE
1265 | IXGB_CONTEXT_DESC_CMD_IP
1266 | IXGB_CONTEXT_DESC_CMD_TCP
1267 | IXGB_CONTEXT_DESC_CMD_IDE
1268 | (skb->len - (hdr_len)));
1269
1270
1271 if (++i == adapter->tx_ring.count) i = 0;
1272 adapter->tx_ring.next_to_use = i;
1273
1274 return 1;
1275 }
1276
1277 return 0;
1278}
1279
1280static bool
1281ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1282{
1283 struct ixgb_context_desc *context_desc;
1284 unsigned int i;
1285 u8 css, cso;
1286
1287 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1288 struct ixgb_buffer *buffer_info;
1289 css = skb_checksum_start_offset(skb);
1290 cso = css + skb->csum_offset;
1291
1292 i = adapter->tx_ring.next_to_use;
1293 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1294 buffer_info = &adapter->tx_ring.buffer_info[i];
1295 WARN_ON(buffer_info->dma != 0);
1296
1297 context_desc->tucss = css;
1298 context_desc->tucso = cso;
1299 context_desc->tucse = 0;
1300 /* zero out any previously existing data in one instruction */
1301 *(u32 *)&(context_desc->ipcss) = 0;
1302 context_desc->status = 0;
1303 context_desc->hdr_len = 0;
1304 context_desc->mss = 0;
1305 context_desc->cmd_type_len =
1306 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1307 | IXGB_TX_DESC_CMD_IDE);
1308
1309 if (++i == adapter->tx_ring.count) i = 0;
1310 adapter->tx_ring.next_to_use = i;
1311
1312 return true;
1313 }
1314
1315 return false;
1316}
1317
1318#define IXGB_MAX_TXD_PWR 14
1319#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1320
1321static int
1322ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1323 unsigned int first)
1324{
1325 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1326 struct pci_dev *pdev = adapter->pdev;
1327 struct ixgb_buffer *buffer_info;
1328 int len = skb_headlen(skb);
1329 unsigned int offset = 0, size, count = 0, i;
1330 unsigned int mss = skb_shinfo(skb)->gso_size;
1331 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1332 unsigned int f;
1333
1334 i = tx_ring->next_to_use;
1335
1336 while (len) {
1337 buffer_info = &tx_ring->buffer_info[i];
1338 size = min(len, IXGB_MAX_DATA_PER_TXD);
1339 /* Workaround for premature desc write-backs
1340 * in TSO mode. Append 4-byte sentinel desc */
1341 if (unlikely(mss && !nr_frags && size == len && size > 8))
1342 size -= 4;
1343
1344 buffer_info->length = size;
1345 WARN_ON(buffer_info->dma != 0);
1346 buffer_info->time_stamp = jiffies;
1347 buffer_info->mapped_as_page = false;
1348 buffer_info->dma = dma_map_single(&pdev->dev,
1349 skb->data + offset,
1350 size, DMA_TO_DEVICE);
1351 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1352 goto dma_error;
1353 buffer_info->next_to_watch = 0;
1354
1355 len -= size;
1356 offset += size;
1357 count++;
1358 if (len) {
1359 i++;
1360 if (i == tx_ring->count)
1361 i = 0;
1362 }
1363 }
1364
1365 for (f = 0; f < nr_frags; f++) {
1366 const struct skb_frag_struct *frag;
1367
1368 frag = &skb_shinfo(skb)->frags[f];
1369 len = skb_frag_size(frag);
1370 offset = 0;
1371
1372 while (len) {
1373 i++;
1374 if (i == tx_ring->count)
1375 i = 0;
1376
1377 buffer_info = &tx_ring->buffer_info[i];
1378 size = min(len, IXGB_MAX_DATA_PER_TXD);
1379
1380 /* Workaround for premature desc write-backs
1381 * in TSO mode. Append 4-byte sentinel desc */
1382 if (unlikely(mss && (f == (nr_frags - 1))
1383 && size == len && size > 8))
1384 size -= 4;
1385
1386 buffer_info->length = size;
1387 buffer_info->time_stamp = jiffies;
1388 buffer_info->mapped_as_page = true;
1389 buffer_info->dma =
1390 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1391 DMA_TO_DEVICE);
1392 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1393 goto dma_error;
1394 buffer_info->next_to_watch = 0;
1395
1396 len -= size;
1397 offset += size;
1398 count++;
1399 }
1400 }
1401 tx_ring->buffer_info[i].skb = skb;
1402 tx_ring->buffer_info[first].next_to_watch = i;
1403
1404 return count;
1405
1406dma_error:
1407 dev_err(&pdev->dev, "TX DMA map failed\n");
1408 buffer_info->dma = 0;
1409 if (count)
1410 count--;
1411
1412 while (count--) {
1413 if (i==0)
1414 i += tx_ring->count;
1415 i--;
1416 buffer_info = &tx_ring->buffer_info[i];
1417 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1418 }
1419
1420 return 0;
1421}
1422
1423static void
1424ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1425{
1426 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1427 struct ixgb_tx_desc *tx_desc = NULL;
1428 struct ixgb_buffer *buffer_info;
1429 u32 cmd_type_len = adapter->tx_cmd_type;
1430 u8 status = 0;
1431 u8 popts = 0;
1432 unsigned int i;
1433
1434 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1435 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1436 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1437 }
1438
1439 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1440 popts |= IXGB_TX_DESC_POPTS_TXSM;
1441
1442 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1443 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1444
1445 i = tx_ring->next_to_use;
1446
1447 while (count--) {
1448 buffer_info = &tx_ring->buffer_info[i];
1449 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1450 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1451 tx_desc->cmd_type_len =
1452 cpu_to_le32(cmd_type_len | buffer_info->length);
1453 tx_desc->status = status;
1454 tx_desc->popts = popts;
1455 tx_desc->vlan = cpu_to_le16(vlan_id);
1456
1457 if (++i == tx_ring->count) i = 0;
1458 }
1459
1460 tx_desc->cmd_type_len |=
1461 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1462
1463 /* Force memory writes to complete before letting h/w
1464 * know there are new descriptors to fetch. (Only
1465 * applicable for weak-ordered memory model archs,
1466 * such as IA-64). */
1467 wmb();
1468
1469 tx_ring->next_to_use = i;
1470 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1471}
1472
1473static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1474{
1475 struct ixgb_adapter *adapter = netdev_priv(netdev);
1476 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1477
1478 netif_stop_queue(netdev);
1479 /* Herbert's original patch had:
1480 * smp_mb__after_netif_stop_queue();
1481 * but since that doesn't exist yet, just open code it. */
1482 smp_mb();
1483
1484 /* We need to check again in a case another CPU has just
1485 * made room available. */
1486 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1487 return -EBUSY;
1488
1489 /* A reprieve! */
1490 netif_start_queue(netdev);
1491 ++adapter->restart_queue;
1492 return 0;
1493}
1494
1495static int ixgb_maybe_stop_tx(struct net_device *netdev,
1496 struct ixgb_desc_ring *tx_ring, int size)
1497{
1498 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1499 return 0;
1500 return __ixgb_maybe_stop_tx(netdev, size);
1501}
1502
1503
1504/* Tx Descriptors needed, worst case */
1505#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1506 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1507#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1508 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1509 + 1 /* one more needed for sentinel TSO workaround */
1510
1511static netdev_tx_t
1512ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1513{
1514 struct ixgb_adapter *adapter = netdev_priv(netdev);
1515 unsigned int first;
1516 unsigned int tx_flags = 0;
1517 int vlan_id = 0;
1518 int count = 0;
1519 int tso;
1520
1521 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1522 dev_kfree_skb_any(skb);
1523 return NETDEV_TX_OK;
1524 }
1525
1526 if (skb->len <= 0) {
1527 dev_kfree_skb_any(skb);
1528 return NETDEV_TX_OK;
1529 }
1530
1531 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1532 DESC_NEEDED)))
1533 return NETDEV_TX_BUSY;
1534
1535 if (vlan_tx_tag_present(skb)) {
1536 tx_flags |= IXGB_TX_FLAGS_VLAN;
1537 vlan_id = vlan_tx_tag_get(skb);
1538 }
1539
1540 first = adapter->tx_ring.next_to_use;
1541
1542 tso = ixgb_tso(adapter, skb);
1543 if (tso < 0) {
1544 dev_kfree_skb_any(skb);
1545 return NETDEV_TX_OK;
1546 }
1547
1548 if (likely(tso))
1549 tx_flags |= IXGB_TX_FLAGS_TSO;
1550 else if (ixgb_tx_csum(adapter, skb))
1551 tx_flags |= IXGB_TX_FLAGS_CSUM;
1552
1553 count = ixgb_tx_map(adapter, skb, first);
1554
1555 if (count) {
1556 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1557 /* Make sure there is space in the ring for the next send. */
1558 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1559
1560 } else {
1561 dev_kfree_skb_any(skb);
1562 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1563 adapter->tx_ring.next_to_use = first;
1564 }
1565
1566 return NETDEV_TX_OK;
1567}
1568
1569/**
1570 * ixgb_tx_timeout - Respond to a Tx Hang
1571 * @netdev: network interface device structure
1572 **/
1573
1574static void
1575ixgb_tx_timeout(struct net_device *netdev)
1576{
1577 struct ixgb_adapter *adapter = netdev_priv(netdev);
1578
1579 /* Do the reset outside of interrupt context */
1580 schedule_work(&adapter->tx_timeout_task);
1581}
1582
1583static void
1584ixgb_tx_timeout_task(struct work_struct *work)
1585{
1586 struct ixgb_adapter *adapter =
1587 container_of(work, struct ixgb_adapter, tx_timeout_task);
1588
1589 adapter->tx_timeout_count++;
1590 ixgb_down(adapter, true);
1591 ixgb_up(adapter);
1592}
1593
1594/**
1595 * ixgb_get_stats - Get System Network Statistics
1596 * @netdev: network interface device structure
1597 *
1598 * Returns the address of the device statistics structure.
1599 * The statistics are actually updated from the timer callback.
1600 **/
1601
1602static struct net_device_stats *
1603ixgb_get_stats(struct net_device *netdev)
1604{
1605 return &netdev->stats;
1606}
1607
1608/**
1609 * ixgb_change_mtu - Change the Maximum Transfer Unit
1610 * @netdev: network interface device structure
1611 * @new_mtu: new value for maximum frame size
1612 *
1613 * Returns 0 on success, negative on failure
1614 **/
1615
1616static int
1617ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1618{
1619 struct ixgb_adapter *adapter = netdev_priv(netdev);
1620 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1621 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1622
1623 /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1624 if ((new_mtu < 68) ||
1625 (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1626 netif_err(adapter, probe, adapter->netdev,
1627 "Invalid MTU setting %d\n", new_mtu);
1628 return -EINVAL;
1629 }
1630
1631 if (old_max_frame == max_frame)
1632 return 0;
1633
1634 if (netif_running(netdev))
1635 ixgb_down(adapter, true);
1636
1637 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1638
1639 netdev->mtu = new_mtu;
1640
1641 if (netif_running(netdev))
1642 ixgb_up(adapter);
1643
1644 return 0;
1645}
1646
1647/**
1648 * ixgb_update_stats - Update the board statistics counters.
1649 * @adapter: board private structure
1650 **/
1651
1652void
1653ixgb_update_stats(struct ixgb_adapter *adapter)
1654{
1655 struct net_device *netdev = adapter->netdev;
1656 struct pci_dev *pdev = adapter->pdev;
1657
1658 /* Prevent stats update while adapter is being reset */
1659 if (pci_channel_offline(pdev))
1660 return;
1661
1662 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1663 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1664 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1665 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1666 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1667 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1668
1669 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1670 /* fix up multicast stats by removing broadcasts */
1671 if (multi >= bcast)
1672 multi -= bcast;
1673
1674 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1675 adapter->stats.mprch += (multi >> 32);
1676 adapter->stats.bprcl += bcast_l;
1677 adapter->stats.bprch += bcast_h;
1678 } else {
1679 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1680 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1681 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1682 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1683 }
1684 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1685 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1686 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1687 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1688 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1689 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1690 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1691 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1692 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1693 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1694 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1695 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1696 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1697 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1698 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1699 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1700 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1701 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1702 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1703 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1704 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1705 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1706 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1707 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1708 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1709 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1710 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1711 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1712 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1713 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1714 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1715 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1716 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1717 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1718 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1719 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1720 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1721 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1722 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1723 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1724 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1725 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1726 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1727 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1728 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1729 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1730 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1731 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1732 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1733 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1734 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1735 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1736 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1737 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1738 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1739 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1740
1741 /* Fill out the OS statistics structure */
1742
1743 netdev->stats.rx_packets = adapter->stats.gprcl;
1744 netdev->stats.tx_packets = adapter->stats.gptcl;
1745 netdev->stats.rx_bytes = adapter->stats.gorcl;
1746 netdev->stats.tx_bytes = adapter->stats.gotcl;
1747 netdev->stats.multicast = adapter->stats.mprcl;
1748 netdev->stats.collisions = 0;
1749
1750 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1751 * with a length in the type/len field */
1752 netdev->stats.rx_errors =
1753 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1754 adapter->stats.ruc +
1755 adapter->stats.roc /*+ adapter->stats.rlec */ +
1756 adapter->stats.icbc +
1757 adapter->stats.ecbc + adapter->stats.mpc;
1758
1759 /* see above
1760 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1761 */
1762
1763 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1764 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1765 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1766 netdev->stats.rx_over_errors = adapter->stats.mpc;
1767
1768 netdev->stats.tx_errors = 0;
1769 netdev->stats.rx_frame_errors = 0;
1770 netdev->stats.tx_aborted_errors = 0;
1771 netdev->stats.tx_carrier_errors = 0;
1772 netdev->stats.tx_fifo_errors = 0;
1773 netdev->stats.tx_heartbeat_errors = 0;
1774 netdev->stats.tx_window_errors = 0;
1775}
1776
1777#define IXGB_MAX_INTR 10
1778/**
1779 * ixgb_intr - Interrupt Handler
1780 * @irq: interrupt number
1781 * @data: pointer to a network interface device structure
1782 **/
1783
1784static irqreturn_t
1785ixgb_intr(int irq, void *data)
1786{
1787 struct net_device *netdev = data;
1788 struct ixgb_adapter *adapter = netdev_priv(netdev);
1789 struct ixgb_hw *hw = &adapter->hw;
1790 u32 icr = IXGB_READ_REG(hw, ICR);
1791
1792 if (unlikely(!icr))
1793 return IRQ_NONE; /* Not our interrupt */
1794
1795 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1796 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1797 mod_timer(&adapter->watchdog_timer, jiffies);
1798
1799 if (napi_schedule_prep(&adapter->napi)) {
1800
1801 /* Disable interrupts and register for poll. The flush
1802 of the posted write is intentionally left out.
1803 */
1804
1805 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1806 __napi_schedule(&adapter->napi);
1807 }
1808 return IRQ_HANDLED;
1809}
1810
1811/**
1812 * ixgb_clean - NAPI Rx polling callback
1813 * @adapter: board private structure
1814 **/
1815
1816static int
1817ixgb_clean(struct napi_struct *napi, int budget)
1818{
1819 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1820 int work_done = 0;
1821
1822 ixgb_clean_tx_irq(adapter);
1823 ixgb_clean_rx_irq(adapter, &work_done, budget);
1824
1825 /* If budget not fully consumed, exit the polling mode */
1826 if (work_done < budget) {
1827 napi_complete(napi);
1828 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1829 ixgb_irq_enable(adapter);
1830 }
1831
1832 return work_done;
1833}
1834
1835/**
1836 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1837 * @adapter: board private structure
1838 **/
1839
1840static bool
1841ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1842{
1843 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1844 struct net_device *netdev = adapter->netdev;
1845 struct ixgb_tx_desc *tx_desc, *eop_desc;
1846 struct ixgb_buffer *buffer_info;
1847 unsigned int i, eop;
1848 bool cleaned = false;
1849
1850 i = tx_ring->next_to_clean;
1851 eop = tx_ring->buffer_info[i].next_to_watch;
1852 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1853
1854 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1855
1856 rmb(); /* read buffer_info after eop_desc */
1857 for (cleaned = false; !cleaned; ) {
1858 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1859 buffer_info = &tx_ring->buffer_info[i];
1860
1861 if (tx_desc->popts &
1862 (IXGB_TX_DESC_POPTS_TXSM |
1863 IXGB_TX_DESC_POPTS_IXSM))
1864 adapter->hw_csum_tx_good++;
1865
1866 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1867
1868 *(u32 *)&(tx_desc->status) = 0;
1869
1870 cleaned = (i == eop);
1871 if (++i == tx_ring->count) i = 0;
1872 }
1873
1874 eop = tx_ring->buffer_info[i].next_to_watch;
1875 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1876 }
1877
1878 tx_ring->next_to_clean = i;
1879
1880 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1881 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1882 /* Make sure that anybody stopping the queue after this
1883 * sees the new next_to_clean. */
1884 smp_mb();
1885
1886 if (netif_queue_stopped(netdev) &&
1887 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1888 netif_wake_queue(netdev);
1889 ++adapter->restart_queue;
1890 }
1891 }
1892
1893 if (adapter->detect_tx_hung) {
1894 /* detect a transmit hang in hardware, this serializes the
1895 * check with the clearing of time_stamp and movement of i */
1896 adapter->detect_tx_hung = false;
1897 if (tx_ring->buffer_info[eop].time_stamp &&
1898 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1899 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1900 IXGB_STATUS_TXOFF)) {
1901 /* detected Tx unit hang */
1902 netif_err(adapter, drv, adapter->netdev,
1903 "Detected Tx Unit Hang\n"
1904 " TDH <%x>\n"
1905 " TDT <%x>\n"
1906 " next_to_use <%x>\n"
1907 " next_to_clean <%x>\n"
1908 "buffer_info[next_to_clean]\n"
1909 " time_stamp <%lx>\n"
1910 " next_to_watch <%x>\n"
1911 " jiffies <%lx>\n"
1912 " next_to_watch.status <%x>\n",
1913 IXGB_READ_REG(&adapter->hw, TDH),
1914 IXGB_READ_REG(&adapter->hw, TDT),
1915 tx_ring->next_to_use,
1916 tx_ring->next_to_clean,
1917 tx_ring->buffer_info[eop].time_stamp,
1918 eop,
1919 jiffies,
1920 eop_desc->status);
1921 netif_stop_queue(netdev);
1922 }
1923 }
1924
1925 return cleaned;
1926}
1927
1928/**
1929 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1930 * @adapter: board private structure
1931 * @rx_desc: receive descriptor
1932 * @sk_buff: socket buffer with received data
1933 **/
1934
1935static void
1936ixgb_rx_checksum(struct ixgb_adapter *adapter,
1937 struct ixgb_rx_desc *rx_desc,
1938 struct sk_buff *skb)
1939{
1940 /* Ignore Checksum bit is set OR
1941 * TCP Checksum has not been calculated
1942 */
1943 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1944 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1945 skb_checksum_none_assert(skb);
1946 return;
1947 }
1948
1949 /* At this point we know the hardware did the TCP checksum */
1950 /* now look at the TCP checksum error bit */
1951 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1952 /* let the stack verify checksum errors */
1953 skb_checksum_none_assert(skb);
1954 adapter->hw_csum_rx_error++;
1955 } else {
1956 /* TCP checksum is good */
1957 skb->ip_summed = CHECKSUM_UNNECESSARY;
1958 adapter->hw_csum_rx_good++;
1959 }
1960}
1961
1962/*
1963 * this should improve performance for small packets with large amounts
1964 * of reassembly being done in the stack
1965 */
1966static void ixgb_check_copybreak(struct net_device *netdev,
1967 struct ixgb_buffer *buffer_info,
1968 u32 length, struct sk_buff **skb)
1969{
1970 struct sk_buff *new_skb;
1971
1972 if (length > copybreak)
1973 return;
1974
1975 new_skb = netdev_alloc_skb_ip_align(netdev, length);
1976 if (!new_skb)
1977 return;
1978
1979 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1980 (*skb)->data - NET_IP_ALIGN,
1981 length + NET_IP_ALIGN);
1982 /* save the skb in buffer_info as good */
1983 buffer_info->skb = *skb;
1984 *skb = new_skb;
1985}
1986
1987/**
1988 * ixgb_clean_rx_irq - Send received data up the network stack,
1989 * @adapter: board private structure
1990 **/
1991
1992static bool
1993ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1994{
1995 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1996 struct net_device *netdev = adapter->netdev;
1997 struct pci_dev *pdev = adapter->pdev;
1998 struct ixgb_rx_desc *rx_desc, *next_rxd;
1999 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2000 u32 length;
2001 unsigned int i, j;
2002 int cleaned_count = 0;
2003 bool cleaned = false;
2004
2005 i = rx_ring->next_to_clean;
2006 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2007 buffer_info = &rx_ring->buffer_info[i];
2008
2009 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2010 struct sk_buff *skb;
2011 u8 status;
2012
2013 if (*work_done >= work_to_do)
2014 break;
2015
2016 (*work_done)++;
2017 rmb(); /* read descriptor and rx_buffer_info after status DD */
2018 status = rx_desc->status;
2019 skb = buffer_info->skb;
2020 buffer_info->skb = NULL;
2021
2022 prefetch(skb->data - NET_IP_ALIGN);
2023
2024 if (++i == rx_ring->count)
2025 i = 0;
2026 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2027 prefetch(next_rxd);
2028
2029 j = i + 1;
2030 if (j == rx_ring->count)
2031 j = 0;
2032 next2_buffer = &rx_ring->buffer_info[j];
2033 prefetch(next2_buffer);
2034
2035 next_buffer = &rx_ring->buffer_info[i];
2036
2037 cleaned = true;
2038 cleaned_count++;
2039
2040 dma_unmap_single(&pdev->dev,
2041 buffer_info->dma,
2042 buffer_info->length,
2043 DMA_FROM_DEVICE);
2044 buffer_info->dma = 0;
2045
2046 length = le16_to_cpu(rx_desc->length);
2047 rx_desc->length = 0;
2048
2049 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2050
2051 /* All receives must fit into a single buffer */
2052
2053 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2054 length);
2055
2056 dev_kfree_skb_irq(skb);
2057 goto rxdesc_done;
2058 }
2059
2060 if (unlikely(rx_desc->errors &
2061 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2062 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2063 dev_kfree_skb_irq(skb);
2064 goto rxdesc_done;
2065 }
2066
2067 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2068
2069 /* Good Receive */
2070 skb_put(skb, length);
2071
2072 /* Receive Checksum Offload */
2073 ixgb_rx_checksum(adapter, rx_desc, skb);
2074
2075 skb->protocol = eth_type_trans(skb, netdev);
2076 if (status & IXGB_RX_DESC_STATUS_VP)
2077 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2078 le16_to_cpu(rx_desc->special));
2079
2080 netif_receive_skb(skb);
2081
2082rxdesc_done:
2083 /* clean up descriptor, might be written over by hw */
2084 rx_desc->status = 0;
2085
2086 /* return some buffers to hardware, one at a time is too slow */
2087 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2088 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2089 cleaned_count = 0;
2090 }
2091
2092 /* use prefetched values */
2093 rx_desc = next_rxd;
2094 buffer_info = next_buffer;
2095 }
2096
2097 rx_ring->next_to_clean = i;
2098
2099 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2100 if (cleaned_count)
2101 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2102
2103 return cleaned;
2104}
2105
2106/**
2107 * ixgb_alloc_rx_buffers - Replace used receive buffers
2108 * @adapter: address of board private structure
2109 **/
2110
2111static void
2112ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2113{
2114 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2115 struct net_device *netdev = adapter->netdev;
2116 struct pci_dev *pdev = adapter->pdev;
2117 struct ixgb_rx_desc *rx_desc;
2118 struct ixgb_buffer *buffer_info;
2119 struct sk_buff *skb;
2120 unsigned int i;
2121 long cleancount;
2122
2123 i = rx_ring->next_to_use;
2124 buffer_info = &rx_ring->buffer_info[i];
2125 cleancount = IXGB_DESC_UNUSED(rx_ring);
2126
2127
2128 /* leave three descriptors unused */
2129 while (--cleancount > 2 && cleaned_count--) {
2130 /* recycle! its good for you */
2131 skb = buffer_info->skb;
2132 if (skb) {
2133 skb_trim(skb, 0);
2134 goto map_skb;
2135 }
2136
2137 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2138 if (unlikely(!skb)) {
2139 /* Better luck next round */
2140 adapter->alloc_rx_buff_failed++;
2141 break;
2142 }
2143
2144 buffer_info->skb = skb;
2145 buffer_info->length = adapter->rx_buffer_len;
2146map_skb:
2147 buffer_info->dma = dma_map_single(&pdev->dev,
2148 skb->data,
2149 adapter->rx_buffer_len,
2150 DMA_FROM_DEVICE);
2151 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2152 adapter->alloc_rx_buff_failed++;
2153 break;
2154 }
2155
2156 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2157 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2158 /* guarantee DD bit not set now before h/w gets descriptor
2159 * this is the rest of the workaround for h/w double
2160 * writeback. */
2161 rx_desc->status = 0;
2162
2163
2164 if (++i == rx_ring->count)
2165 i = 0;
2166 buffer_info = &rx_ring->buffer_info[i];
2167 }
2168
2169 if (likely(rx_ring->next_to_use != i)) {
2170 rx_ring->next_to_use = i;
2171 if (unlikely(i-- == 0))
2172 i = (rx_ring->count - 1);
2173
2174 /* Force memory writes to complete before letting h/w
2175 * know there are new descriptors to fetch. (Only
2176 * applicable for weak-ordered memory model archs, such
2177 * as IA-64). */
2178 wmb();
2179 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2180 }
2181}
2182
2183static void
2184ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2185{
2186 u32 ctrl;
2187
2188 /* enable VLAN tag insert/strip */
2189 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2190 ctrl |= IXGB_CTRL0_VME;
2191 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2192}
2193
2194static void
2195ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2196{
2197 u32 ctrl;
2198
2199 /* disable VLAN tag insert/strip */
2200 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2201 ctrl &= ~IXGB_CTRL0_VME;
2202 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2203}
2204
2205static int
2206ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2207{
2208 struct ixgb_adapter *adapter = netdev_priv(netdev);
2209 u32 vfta, index;
2210
2211 /* add VID to filter table */
2212
2213 index = (vid >> 5) & 0x7F;
2214 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2215 vfta |= (1 << (vid & 0x1F));
2216 ixgb_write_vfta(&adapter->hw, index, vfta);
2217 set_bit(vid, adapter->active_vlans);
2218
2219 return 0;
2220}
2221
2222static int
2223ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2224{
2225 struct ixgb_adapter *adapter = netdev_priv(netdev);
2226 u32 vfta, index;
2227
2228 /* remove VID from filter table */
2229
2230 index = (vid >> 5) & 0x7F;
2231 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2232 vfta &= ~(1 << (vid & 0x1F));
2233 ixgb_write_vfta(&adapter->hw, index, vfta);
2234 clear_bit(vid, adapter->active_vlans);
2235
2236 return 0;
2237}
2238
2239static void
2240ixgb_restore_vlan(struct ixgb_adapter *adapter)
2241{
2242 u16 vid;
2243
2244 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2245 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2246}
2247
2248#ifdef CONFIG_NET_POLL_CONTROLLER
2249/*
2250 * Polling 'interrupt' - used by things like netconsole to send skbs
2251 * without having to re-enable interrupts. It's not called while
2252 * the interrupt routine is executing.
2253 */
2254
2255static void ixgb_netpoll(struct net_device *dev)
2256{
2257 struct ixgb_adapter *adapter = netdev_priv(dev);
2258
2259 disable_irq(adapter->pdev->irq);
2260 ixgb_intr(adapter->pdev->irq, dev);
2261 enable_irq(adapter->pdev->irq);
2262}
2263#endif
2264
2265/**
2266 * ixgb_io_error_detected - called when PCI error is detected
2267 * @pdev: pointer to pci device with error
2268 * @state: pci channel state after error
2269 *
2270 * This callback is called by the PCI subsystem whenever
2271 * a PCI bus error is detected.
2272 */
2273static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2274 enum pci_channel_state state)
2275{
2276 struct net_device *netdev = pci_get_drvdata(pdev);
2277 struct ixgb_adapter *adapter = netdev_priv(netdev);
2278
2279 netif_device_detach(netdev);
2280
2281 if (state == pci_channel_io_perm_failure)
2282 return PCI_ERS_RESULT_DISCONNECT;
2283
2284 if (netif_running(netdev))
2285 ixgb_down(adapter, true);
2286
2287 pci_disable_device(pdev);
2288
2289 /* Request a slot reset. */
2290 return PCI_ERS_RESULT_NEED_RESET;
2291}
2292
2293/**
2294 * ixgb_io_slot_reset - called after the pci bus has been reset.
2295 * @pdev pointer to pci device with error
2296 *
2297 * This callback is called after the PCI bus has been reset.
2298 * Basically, this tries to restart the card from scratch.
2299 * This is a shortened version of the device probe/discovery code,
2300 * it resembles the first-half of the ixgb_probe() routine.
2301 */
2302static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2303{
2304 struct net_device *netdev = pci_get_drvdata(pdev);
2305 struct ixgb_adapter *adapter = netdev_priv(netdev);
2306
2307 if (pci_enable_device(pdev)) {
2308 netif_err(adapter, probe, adapter->netdev,
2309 "Cannot re-enable PCI device after reset\n");
2310 return PCI_ERS_RESULT_DISCONNECT;
2311 }
2312
2313 /* Perform card reset only on one instance of the card */
2314 if (0 != PCI_FUNC (pdev->devfn))
2315 return PCI_ERS_RESULT_RECOVERED;
2316
2317 pci_set_master(pdev);
2318
2319 netif_carrier_off(netdev);
2320 netif_stop_queue(netdev);
2321 ixgb_reset(adapter);
2322
2323 /* Make sure the EEPROM is good */
2324 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2325 netif_err(adapter, probe, adapter->netdev,
2326 "After reset, the EEPROM checksum is not valid\n");
2327 return PCI_ERS_RESULT_DISCONNECT;
2328 }
2329 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2330 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2331
2332 if (!is_valid_ether_addr(netdev->perm_addr)) {
2333 netif_err(adapter, probe, adapter->netdev,
2334 "After reset, invalid MAC address\n");
2335 return PCI_ERS_RESULT_DISCONNECT;
2336 }
2337
2338 return PCI_ERS_RESULT_RECOVERED;
2339}
2340
2341/**
2342 * ixgb_io_resume - called when its OK to resume normal operations
2343 * @pdev pointer to pci device with error
2344 *
2345 * The error recovery driver tells us that its OK to resume
2346 * normal operation. Implementation resembles the second-half
2347 * of the ixgb_probe() routine.
2348 */
2349static void ixgb_io_resume(struct pci_dev *pdev)
2350{
2351 struct net_device *netdev = pci_get_drvdata(pdev);
2352 struct ixgb_adapter *adapter = netdev_priv(netdev);
2353
2354 pci_set_master(pdev);
2355
2356 if (netif_running(netdev)) {
2357 if (ixgb_up(adapter)) {
2358 pr_err("can't bring device back up after reset\n");
2359 return;
2360 }
2361 }
2362
2363 netif_device_attach(netdev);
2364 mod_timer(&adapter->watchdog_timer, jiffies);
2365}
2366
2367/* ixgb_main.c */