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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 const struct pci_device_id 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 netif_carrier_off(netdev);
289
290 napi_disable(&adapter->napi);
291 /* waiting for NAPI to complete can re-enable interrupts */
292 ixgb_irq_disable(adapter);
293 free_irq(adapter->pdev->irq, netdev);
294
295 if (adapter->have_msi)
296 pci_disable_msi(adapter->pdev);
297
298 if (kill_watchdog)
299 del_timer_sync(&adapter->watchdog_timer);
300
301 adapter->link_speed = 0;
302 adapter->link_duplex = 0;
303 netif_stop_queue(netdev);
304
305 ixgb_reset(adapter);
306 ixgb_clean_tx_ring(adapter);
307 ixgb_clean_rx_ring(adapter);
308}
309
310void
311ixgb_reset(struct ixgb_adapter *adapter)
312{
313 struct ixgb_hw *hw = &adapter->hw;
314
315 ixgb_adapter_stop(hw);
316 if (!ixgb_init_hw(hw))
317 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
318
319 /* restore frame size information */
320 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
321 if (hw->max_frame_size >
322 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
323 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
324 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
325 ctrl0 |= IXGB_CTRL0_JFE;
326 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
327 }
328 }
329}
330
331static netdev_features_t
332ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
333{
334 /*
335 * Tx VLAN insertion does not work per HW design when Rx stripping is
336 * disabled.
337 */
338 if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
339 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
340
341 return features;
342}
343
344static int
345ixgb_set_features(struct net_device *netdev, netdev_features_t features)
346{
347 struct ixgb_adapter *adapter = netdev_priv(netdev);
348 netdev_features_t changed = features ^ netdev->features;
349
350 if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
351 return 0;
352
353 adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
354
355 if (netif_running(netdev)) {
356 ixgb_down(adapter, true);
357 ixgb_up(adapter);
358 ixgb_set_speed_duplex(netdev);
359 } else
360 ixgb_reset(adapter);
361
362 return 0;
363}
364
365
366static const struct net_device_ops ixgb_netdev_ops = {
367 .ndo_open = ixgb_open,
368 .ndo_stop = ixgb_close,
369 .ndo_start_xmit = ixgb_xmit_frame,
370 .ndo_get_stats = ixgb_get_stats,
371 .ndo_set_rx_mode = ixgb_set_multi,
372 .ndo_validate_addr = eth_validate_addr,
373 .ndo_set_mac_address = ixgb_set_mac,
374 .ndo_change_mtu = ixgb_change_mtu,
375 .ndo_tx_timeout = ixgb_tx_timeout,
376 .ndo_vlan_rx_add_vid = ixgb_vlan_rx_add_vid,
377 .ndo_vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid,
378#ifdef CONFIG_NET_POLL_CONTROLLER
379 .ndo_poll_controller = ixgb_netpoll,
380#endif
381 .ndo_fix_features = ixgb_fix_features,
382 .ndo_set_features = ixgb_set_features,
383};
384
385/**
386 * ixgb_probe - Device Initialization Routine
387 * @pdev: PCI device information struct
388 * @ent: entry in ixgb_pci_tbl
389 *
390 * Returns 0 on success, negative on failure
391 *
392 * ixgb_probe initializes an adapter identified by a pci_dev structure.
393 * The OS initialization, configuring of the adapter private structure,
394 * and a hardware reset occur.
395 **/
396
397static int
398ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
399{
400 struct net_device *netdev = NULL;
401 struct ixgb_adapter *adapter;
402 static int cards_found = 0;
403 int pci_using_dac;
404 int i;
405 int err;
406
407 err = pci_enable_device(pdev);
408 if (err)
409 return err;
410
411 pci_using_dac = 0;
412 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
413 if (!err) {
414 pci_using_dac = 1;
415 } else {
416 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
417 if (err) {
418 pr_err("No usable DMA configuration, aborting\n");
419 goto err_dma_mask;
420 }
421 }
422
423 err = pci_request_regions(pdev, ixgb_driver_name);
424 if (err)
425 goto err_request_regions;
426
427 pci_set_master(pdev);
428
429 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
430 if (!netdev) {
431 err = -ENOMEM;
432 goto err_alloc_etherdev;
433 }
434
435 SET_NETDEV_DEV(netdev, &pdev->dev);
436
437 pci_set_drvdata(pdev, netdev);
438 adapter = netdev_priv(netdev);
439 adapter->netdev = netdev;
440 adapter->pdev = pdev;
441 adapter->hw.back = adapter;
442 adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
443
444 adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
445 if (!adapter->hw.hw_addr) {
446 err = -EIO;
447 goto err_ioremap;
448 }
449
450 for (i = BAR_1; i <= BAR_5; i++) {
451 if (pci_resource_len(pdev, i) == 0)
452 continue;
453 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
454 adapter->hw.io_base = pci_resource_start(pdev, i);
455 break;
456 }
457 }
458
459 netdev->netdev_ops = &ixgb_netdev_ops;
460 ixgb_set_ethtool_ops(netdev);
461 netdev->watchdog_timeo = 5 * HZ;
462 netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
463
464 strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
465
466 adapter->bd_number = cards_found;
467 adapter->link_speed = 0;
468 adapter->link_duplex = 0;
469
470 /* setup the private structure */
471
472 err = ixgb_sw_init(adapter);
473 if (err)
474 goto err_sw_init;
475
476 netdev->hw_features = NETIF_F_SG |
477 NETIF_F_TSO |
478 NETIF_F_HW_CSUM |
479 NETIF_F_HW_VLAN_CTAG_TX |
480 NETIF_F_HW_VLAN_CTAG_RX;
481 netdev->features = netdev->hw_features |
482 NETIF_F_HW_VLAN_CTAG_FILTER;
483 netdev->hw_features |= NETIF_F_RXCSUM;
484
485 if (pci_using_dac) {
486 netdev->features |= NETIF_F_HIGHDMA;
487 netdev->vlan_features |= NETIF_F_HIGHDMA;
488 }
489
490 /* MTU range: 68 - 16114 */
491 netdev->min_mtu = ETH_MIN_MTU;
492 netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
493
494 /* make sure the EEPROM is good */
495
496 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
497 netif_err(adapter, probe, adapter->netdev,
498 "The EEPROM Checksum Is Not Valid\n");
499 err = -EIO;
500 goto err_eeprom;
501 }
502
503 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
504
505 if (!is_valid_ether_addr(netdev->dev_addr)) {
506 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
507 err = -EIO;
508 goto err_eeprom;
509 }
510
511 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
512
513 init_timer(&adapter->watchdog_timer);
514 adapter->watchdog_timer.function = ixgb_watchdog;
515 adapter->watchdog_timer.data = (unsigned long)adapter;
516
517 INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
518
519 strcpy(netdev->name, "eth%d");
520 err = register_netdev(netdev);
521 if (err)
522 goto err_register;
523
524 /* carrier off reporting is important to ethtool even BEFORE open */
525 netif_carrier_off(netdev);
526
527 netif_info(adapter, probe, adapter->netdev,
528 "Intel(R) PRO/10GbE Network Connection\n");
529 ixgb_check_options(adapter);
530 /* reset the hardware with the new settings */
531
532 ixgb_reset(adapter);
533
534 cards_found++;
535 return 0;
536
537err_register:
538err_sw_init:
539err_eeprom:
540 iounmap(adapter->hw.hw_addr);
541err_ioremap:
542 free_netdev(netdev);
543err_alloc_etherdev:
544 pci_release_regions(pdev);
545err_request_regions:
546err_dma_mask:
547 pci_disable_device(pdev);
548 return err;
549}
550
551/**
552 * ixgb_remove - Device Removal Routine
553 * @pdev: PCI device information struct
554 *
555 * ixgb_remove is called by the PCI subsystem to alert the driver
556 * that it should release a PCI device. The could be caused by a
557 * Hot-Plug event, or because the driver is going to be removed from
558 * memory.
559 **/
560
561static void
562ixgb_remove(struct pci_dev *pdev)
563{
564 struct net_device *netdev = pci_get_drvdata(pdev);
565 struct ixgb_adapter *adapter = netdev_priv(netdev);
566
567 cancel_work_sync(&adapter->tx_timeout_task);
568
569 unregister_netdev(netdev);
570
571 iounmap(adapter->hw.hw_addr);
572 pci_release_regions(pdev);
573
574 free_netdev(netdev);
575 pci_disable_device(pdev);
576}
577
578/**
579 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
580 * @adapter: board private structure to initialize
581 *
582 * ixgb_sw_init initializes the Adapter private data structure.
583 * Fields are initialized based on PCI device information and
584 * OS network device settings (MTU size).
585 **/
586
587static int
588ixgb_sw_init(struct ixgb_adapter *adapter)
589{
590 struct ixgb_hw *hw = &adapter->hw;
591 struct net_device *netdev = adapter->netdev;
592 struct pci_dev *pdev = adapter->pdev;
593
594 /* PCI config space info */
595
596 hw->vendor_id = pdev->vendor;
597 hw->device_id = pdev->device;
598 hw->subsystem_vendor_id = pdev->subsystem_vendor;
599 hw->subsystem_id = pdev->subsystem_device;
600
601 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
602 adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
603
604 if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
605 (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
606 (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
607 (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
608 hw->mac_type = ixgb_82597;
609 else {
610 /* should never have loaded on this device */
611 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
612 }
613
614 /* enable flow control to be programmed */
615 hw->fc.send_xon = 1;
616
617 set_bit(__IXGB_DOWN, &adapter->flags);
618 return 0;
619}
620
621/**
622 * ixgb_open - Called when a network interface is made active
623 * @netdev: network interface device structure
624 *
625 * Returns 0 on success, negative value on failure
626 *
627 * The open entry point is called when a network interface is made
628 * active by the system (IFF_UP). At this point all resources needed
629 * for transmit and receive operations are allocated, the interrupt
630 * handler is registered with the OS, the watchdog timer is started,
631 * and the stack is notified that the interface is ready.
632 **/
633
634static int
635ixgb_open(struct net_device *netdev)
636{
637 struct ixgb_adapter *adapter = netdev_priv(netdev);
638 int err;
639
640 /* allocate transmit descriptors */
641 err = ixgb_setup_tx_resources(adapter);
642 if (err)
643 goto err_setup_tx;
644
645 netif_carrier_off(netdev);
646
647 /* allocate receive descriptors */
648
649 err = ixgb_setup_rx_resources(adapter);
650 if (err)
651 goto err_setup_rx;
652
653 err = ixgb_up(adapter);
654 if (err)
655 goto err_up;
656
657 netif_start_queue(netdev);
658
659 return 0;
660
661err_up:
662 ixgb_free_rx_resources(adapter);
663err_setup_rx:
664 ixgb_free_tx_resources(adapter);
665err_setup_tx:
666 ixgb_reset(adapter);
667
668 return err;
669}
670
671/**
672 * ixgb_close - Disables a network interface
673 * @netdev: network interface device structure
674 *
675 * Returns 0, this is not allowed to fail
676 *
677 * The close entry point is called when an interface is de-activated
678 * by the OS. The hardware is still under the drivers control, but
679 * needs to be disabled. A global MAC reset is issued to stop the
680 * hardware, and all transmit and receive resources are freed.
681 **/
682
683static int
684ixgb_close(struct net_device *netdev)
685{
686 struct ixgb_adapter *adapter = netdev_priv(netdev);
687
688 ixgb_down(adapter, true);
689
690 ixgb_free_tx_resources(adapter);
691 ixgb_free_rx_resources(adapter);
692
693 return 0;
694}
695
696/**
697 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
698 * @adapter: board private structure
699 *
700 * Return 0 on success, negative on failure
701 **/
702
703int
704ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
705{
706 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
707 struct pci_dev *pdev = adapter->pdev;
708 int size;
709
710 size = sizeof(struct ixgb_buffer) * txdr->count;
711 txdr->buffer_info = vzalloc(size);
712 if (!txdr->buffer_info)
713 return -ENOMEM;
714
715 /* round up to nearest 4K */
716
717 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
718 txdr->size = ALIGN(txdr->size, 4096);
719
720 txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
721 GFP_KERNEL);
722 if (!txdr->desc) {
723 vfree(txdr->buffer_info);
724 return -ENOMEM;
725 }
726
727 txdr->next_to_use = 0;
728 txdr->next_to_clean = 0;
729
730 return 0;
731}
732
733/**
734 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
735 * @adapter: board private structure
736 *
737 * Configure the Tx unit of the MAC after a reset.
738 **/
739
740static void
741ixgb_configure_tx(struct ixgb_adapter *adapter)
742{
743 u64 tdba = adapter->tx_ring.dma;
744 u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
745 u32 tctl;
746 struct ixgb_hw *hw = &adapter->hw;
747
748 /* Setup the Base and Length of the Tx Descriptor Ring
749 * tx_ring.dma can be either a 32 or 64 bit value
750 */
751
752 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
753 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
754
755 IXGB_WRITE_REG(hw, TDLEN, tdlen);
756
757 /* Setup the HW Tx Head and Tail descriptor pointers */
758
759 IXGB_WRITE_REG(hw, TDH, 0);
760 IXGB_WRITE_REG(hw, TDT, 0);
761
762 /* don't set up txdctl, it induces performance problems if configured
763 * incorrectly */
764 /* Set the Tx Interrupt Delay register */
765
766 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
767
768 /* Program the Transmit Control Register */
769
770 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
771 IXGB_WRITE_REG(hw, TCTL, tctl);
772
773 /* Setup Transmit Descriptor Settings for this adapter */
774 adapter->tx_cmd_type =
775 IXGB_TX_DESC_TYPE |
776 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
777}
778
779/**
780 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
781 * @adapter: board private structure
782 *
783 * Returns 0 on success, negative on failure
784 **/
785
786int
787ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
788{
789 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
790 struct pci_dev *pdev = adapter->pdev;
791 int size;
792
793 size = sizeof(struct ixgb_buffer) * rxdr->count;
794 rxdr->buffer_info = vzalloc(size);
795 if (!rxdr->buffer_info)
796 return -ENOMEM;
797
798 /* Round up to nearest 4K */
799
800 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
801 rxdr->size = ALIGN(rxdr->size, 4096);
802
803 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
804 GFP_KERNEL);
805
806 if (!rxdr->desc) {
807 vfree(rxdr->buffer_info);
808 return -ENOMEM;
809 }
810 memset(rxdr->desc, 0, rxdr->size);
811
812 rxdr->next_to_clean = 0;
813 rxdr->next_to_use = 0;
814
815 return 0;
816}
817
818/**
819 * ixgb_setup_rctl - configure the receive control register
820 * @adapter: Board private structure
821 **/
822
823static void
824ixgb_setup_rctl(struct ixgb_adapter *adapter)
825{
826 u32 rctl;
827
828 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
829
830 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
831
832 rctl |=
833 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
834 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
835 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
836
837 rctl |= IXGB_RCTL_SECRC;
838
839 if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
840 rctl |= IXGB_RCTL_BSIZE_2048;
841 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
842 rctl |= IXGB_RCTL_BSIZE_4096;
843 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
844 rctl |= IXGB_RCTL_BSIZE_8192;
845 else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
846 rctl |= IXGB_RCTL_BSIZE_16384;
847
848 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
849}
850
851/**
852 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
853 * @adapter: board private structure
854 *
855 * Configure the Rx unit of the MAC after a reset.
856 **/
857
858static void
859ixgb_configure_rx(struct ixgb_adapter *adapter)
860{
861 u64 rdba = adapter->rx_ring.dma;
862 u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
863 struct ixgb_hw *hw = &adapter->hw;
864 u32 rctl;
865 u32 rxcsum;
866
867 /* make sure receives are disabled while setting up the descriptors */
868
869 rctl = IXGB_READ_REG(hw, RCTL);
870 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
871
872 /* set the Receive Delay Timer Register */
873
874 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
875
876 /* Setup the Base and Length of the Rx Descriptor Ring */
877
878 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
879 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
880
881 IXGB_WRITE_REG(hw, RDLEN, rdlen);
882
883 /* Setup the HW Rx Head and Tail Descriptor Pointers */
884 IXGB_WRITE_REG(hw, RDH, 0);
885 IXGB_WRITE_REG(hw, RDT, 0);
886
887 /* due to the hardware errata with RXDCTL, we are unable to use any of
888 * the performance enhancing features of it without causing other
889 * subtle bugs, some of the bugs could include receive length
890 * corruption at high data rates (WTHRESH > 0) and/or receive
891 * descriptor ring irregularites (particularly in hardware cache) */
892 IXGB_WRITE_REG(hw, RXDCTL, 0);
893
894 /* Enable Receive Checksum Offload for TCP and UDP */
895 if (adapter->rx_csum) {
896 rxcsum = IXGB_READ_REG(hw, RXCSUM);
897 rxcsum |= IXGB_RXCSUM_TUOFL;
898 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
899 }
900
901 /* Enable Receives */
902
903 IXGB_WRITE_REG(hw, RCTL, rctl);
904}
905
906/**
907 * ixgb_free_tx_resources - Free Tx Resources
908 * @adapter: board private structure
909 *
910 * Free all transmit software resources
911 **/
912
913void
914ixgb_free_tx_resources(struct ixgb_adapter *adapter)
915{
916 struct pci_dev *pdev = adapter->pdev;
917
918 ixgb_clean_tx_ring(adapter);
919
920 vfree(adapter->tx_ring.buffer_info);
921 adapter->tx_ring.buffer_info = NULL;
922
923 dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
924 adapter->tx_ring.desc, adapter->tx_ring.dma);
925
926 adapter->tx_ring.desc = NULL;
927}
928
929static void
930ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
931 struct ixgb_buffer *buffer_info)
932{
933 if (buffer_info->dma) {
934 if (buffer_info->mapped_as_page)
935 dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
936 buffer_info->length, DMA_TO_DEVICE);
937 else
938 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
939 buffer_info->length, DMA_TO_DEVICE);
940 buffer_info->dma = 0;
941 }
942
943 if (buffer_info->skb) {
944 dev_kfree_skb_any(buffer_info->skb);
945 buffer_info->skb = NULL;
946 }
947 buffer_info->time_stamp = 0;
948 /* these fields must always be initialized in tx
949 * buffer_info->length = 0;
950 * buffer_info->next_to_watch = 0; */
951}
952
953/**
954 * ixgb_clean_tx_ring - Free Tx Buffers
955 * @adapter: board private structure
956 **/
957
958static void
959ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
960{
961 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
962 struct ixgb_buffer *buffer_info;
963 unsigned long size;
964 unsigned int i;
965
966 /* Free all the Tx ring sk_buffs */
967
968 for (i = 0; i < tx_ring->count; i++) {
969 buffer_info = &tx_ring->buffer_info[i];
970 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
971 }
972
973 size = sizeof(struct ixgb_buffer) * tx_ring->count;
974 memset(tx_ring->buffer_info, 0, size);
975
976 /* Zero out the descriptor ring */
977
978 memset(tx_ring->desc, 0, tx_ring->size);
979
980 tx_ring->next_to_use = 0;
981 tx_ring->next_to_clean = 0;
982
983 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
984 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
985}
986
987/**
988 * ixgb_free_rx_resources - Free Rx Resources
989 * @adapter: board private structure
990 *
991 * Free all receive software resources
992 **/
993
994void
995ixgb_free_rx_resources(struct ixgb_adapter *adapter)
996{
997 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
998 struct pci_dev *pdev = adapter->pdev;
999
1000 ixgb_clean_rx_ring(adapter);
1001
1002 vfree(rx_ring->buffer_info);
1003 rx_ring->buffer_info = NULL;
1004
1005 dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1006 rx_ring->dma);
1007
1008 rx_ring->desc = NULL;
1009}
1010
1011/**
1012 * ixgb_clean_rx_ring - Free Rx Buffers
1013 * @adapter: board private structure
1014 **/
1015
1016static void
1017ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1018{
1019 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1020 struct ixgb_buffer *buffer_info;
1021 struct pci_dev *pdev = adapter->pdev;
1022 unsigned long size;
1023 unsigned int i;
1024
1025 /* Free all the Rx ring sk_buffs */
1026
1027 for (i = 0; i < rx_ring->count; i++) {
1028 buffer_info = &rx_ring->buffer_info[i];
1029 if (buffer_info->dma) {
1030 dma_unmap_single(&pdev->dev,
1031 buffer_info->dma,
1032 buffer_info->length,
1033 DMA_FROM_DEVICE);
1034 buffer_info->dma = 0;
1035 buffer_info->length = 0;
1036 }
1037
1038 if (buffer_info->skb) {
1039 dev_kfree_skb(buffer_info->skb);
1040 buffer_info->skb = NULL;
1041 }
1042 }
1043
1044 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1045 memset(rx_ring->buffer_info, 0, size);
1046
1047 /* Zero out the descriptor ring */
1048
1049 memset(rx_ring->desc, 0, rx_ring->size);
1050
1051 rx_ring->next_to_clean = 0;
1052 rx_ring->next_to_use = 0;
1053
1054 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1055 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1056}
1057
1058/**
1059 * ixgb_set_mac - Change the Ethernet Address of the NIC
1060 * @netdev: network interface device structure
1061 * @p: pointer to an address structure
1062 *
1063 * Returns 0 on success, negative on failure
1064 **/
1065
1066static int
1067ixgb_set_mac(struct net_device *netdev, void *p)
1068{
1069 struct ixgb_adapter *adapter = netdev_priv(netdev);
1070 struct sockaddr *addr = p;
1071
1072 if (!is_valid_ether_addr(addr->sa_data))
1073 return -EADDRNOTAVAIL;
1074
1075 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1076
1077 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1078
1079 return 0;
1080}
1081
1082/**
1083 * ixgb_set_multi - Multicast and Promiscuous mode set
1084 * @netdev: network interface device structure
1085 *
1086 * The set_multi entry point is called whenever the multicast address
1087 * list or the network interface flags are updated. This routine is
1088 * responsible for configuring the hardware for proper multicast,
1089 * promiscuous mode, and all-multi behavior.
1090 **/
1091
1092static void
1093ixgb_set_multi(struct net_device *netdev)
1094{
1095 struct ixgb_adapter *adapter = netdev_priv(netdev);
1096 struct ixgb_hw *hw = &adapter->hw;
1097 struct netdev_hw_addr *ha;
1098 u32 rctl;
1099
1100 /* Check for Promiscuous and All Multicast modes */
1101
1102 rctl = IXGB_READ_REG(hw, RCTL);
1103
1104 if (netdev->flags & IFF_PROMISC) {
1105 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1106 /* disable VLAN filtering */
1107 rctl &= ~IXGB_RCTL_CFIEN;
1108 rctl &= ~IXGB_RCTL_VFE;
1109 } else {
1110 if (netdev->flags & IFF_ALLMULTI) {
1111 rctl |= IXGB_RCTL_MPE;
1112 rctl &= ~IXGB_RCTL_UPE;
1113 } else {
1114 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1115 }
1116 /* enable VLAN filtering */
1117 rctl |= IXGB_RCTL_VFE;
1118 rctl &= ~IXGB_RCTL_CFIEN;
1119 }
1120
1121 if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1122 rctl |= IXGB_RCTL_MPE;
1123 IXGB_WRITE_REG(hw, RCTL, rctl);
1124 } else {
1125 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1126 ETH_ALEN, GFP_ATOMIC);
1127 u8 *addr;
1128 if (!mta)
1129 goto alloc_failed;
1130
1131 IXGB_WRITE_REG(hw, RCTL, rctl);
1132
1133 addr = mta;
1134 netdev_for_each_mc_addr(ha, netdev) {
1135 memcpy(addr, ha->addr, ETH_ALEN);
1136 addr += ETH_ALEN;
1137 }
1138
1139 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1140 kfree(mta);
1141 }
1142
1143alloc_failed:
1144 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1145 ixgb_vlan_strip_enable(adapter);
1146 else
1147 ixgb_vlan_strip_disable(adapter);
1148
1149}
1150
1151/**
1152 * ixgb_watchdog - Timer Call-back
1153 * @data: pointer to netdev cast into an unsigned long
1154 **/
1155
1156static void
1157ixgb_watchdog(unsigned long data)
1158{
1159 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1160 struct net_device *netdev = adapter->netdev;
1161 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1162
1163 ixgb_check_for_link(&adapter->hw);
1164
1165 if (ixgb_check_for_bad_link(&adapter->hw)) {
1166 /* force the reset path */
1167 netif_stop_queue(netdev);
1168 }
1169
1170 if (adapter->hw.link_up) {
1171 if (!netif_carrier_ok(netdev)) {
1172 netdev_info(netdev,
1173 "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1174 (adapter->hw.fc.type == ixgb_fc_full) ?
1175 "RX/TX" :
1176 (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1177 "RX" :
1178 (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1179 "TX" : "None");
1180 adapter->link_speed = 10000;
1181 adapter->link_duplex = FULL_DUPLEX;
1182 netif_carrier_on(netdev);
1183 }
1184 } else {
1185 if (netif_carrier_ok(netdev)) {
1186 adapter->link_speed = 0;
1187 adapter->link_duplex = 0;
1188 netdev_info(netdev, "NIC Link is Down\n");
1189 netif_carrier_off(netdev);
1190 }
1191 }
1192
1193 ixgb_update_stats(adapter);
1194
1195 if (!netif_carrier_ok(netdev)) {
1196 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1197 /* We've lost link, so the controller stops DMA,
1198 * but we've got queued Tx work that's never going
1199 * to get done, so reset controller to flush Tx.
1200 * (Do the reset outside of interrupt context). */
1201 schedule_work(&adapter->tx_timeout_task);
1202 /* return immediately since reset is imminent */
1203 return;
1204 }
1205 }
1206
1207 /* Force detection of hung controller every watchdog period */
1208 adapter->detect_tx_hung = true;
1209
1210 /* generate an interrupt to force clean up of any stragglers */
1211 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1212
1213 /* Reset the timer */
1214 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1215}
1216
1217#define IXGB_TX_FLAGS_CSUM 0x00000001
1218#define IXGB_TX_FLAGS_VLAN 0x00000002
1219#define IXGB_TX_FLAGS_TSO 0x00000004
1220
1221static int
1222ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1223{
1224 struct ixgb_context_desc *context_desc;
1225 unsigned int i;
1226 u8 ipcss, ipcso, tucss, tucso, hdr_len;
1227 u16 ipcse, tucse, mss;
1228
1229 if (likely(skb_is_gso(skb))) {
1230 struct ixgb_buffer *buffer_info;
1231 struct iphdr *iph;
1232 int err;
1233
1234 err = skb_cow_head(skb, 0);
1235 if (err < 0)
1236 return err;
1237
1238 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1239 mss = skb_shinfo(skb)->gso_size;
1240 iph = ip_hdr(skb);
1241 iph->tot_len = 0;
1242 iph->check = 0;
1243 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1244 iph->daddr, 0,
1245 IPPROTO_TCP, 0);
1246 ipcss = skb_network_offset(skb);
1247 ipcso = (void *)&(iph->check) - (void *)skb->data;
1248 ipcse = skb_transport_offset(skb) - 1;
1249 tucss = skb_transport_offset(skb);
1250 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1251 tucse = 0;
1252
1253 i = adapter->tx_ring.next_to_use;
1254 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1255 buffer_info = &adapter->tx_ring.buffer_info[i];
1256 WARN_ON(buffer_info->dma != 0);
1257
1258 context_desc->ipcss = ipcss;
1259 context_desc->ipcso = ipcso;
1260 context_desc->ipcse = cpu_to_le16(ipcse);
1261 context_desc->tucss = tucss;
1262 context_desc->tucso = tucso;
1263 context_desc->tucse = cpu_to_le16(tucse);
1264 context_desc->mss = cpu_to_le16(mss);
1265 context_desc->hdr_len = hdr_len;
1266 context_desc->status = 0;
1267 context_desc->cmd_type_len = cpu_to_le32(
1268 IXGB_CONTEXT_DESC_TYPE
1269 | IXGB_CONTEXT_DESC_CMD_TSE
1270 | IXGB_CONTEXT_DESC_CMD_IP
1271 | IXGB_CONTEXT_DESC_CMD_TCP
1272 | IXGB_CONTEXT_DESC_CMD_IDE
1273 | (skb->len - (hdr_len)));
1274
1275
1276 if (++i == adapter->tx_ring.count) i = 0;
1277 adapter->tx_ring.next_to_use = i;
1278
1279 return 1;
1280 }
1281
1282 return 0;
1283}
1284
1285static bool
1286ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1287{
1288 struct ixgb_context_desc *context_desc;
1289 unsigned int i;
1290 u8 css, cso;
1291
1292 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1293 struct ixgb_buffer *buffer_info;
1294 css = skb_checksum_start_offset(skb);
1295 cso = css + skb->csum_offset;
1296
1297 i = adapter->tx_ring.next_to_use;
1298 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1299 buffer_info = &adapter->tx_ring.buffer_info[i];
1300 WARN_ON(buffer_info->dma != 0);
1301
1302 context_desc->tucss = css;
1303 context_desc->tucso = cso;
1304 context_desc->tucse = 0;
1305 /* zero out any previously existing data in one instruction */
1306 *(u32 *)&(context_desc->ipcss) = 0;
1307 context_desc->status = 0;
1308 context_desc->hdr_len = 0;
1309 context_desc->mss = 0;
1310 context_desc->cmd_type_len =
1311 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1312 | IXGB_TX_DESC_CMD_IDE);
1313
1314 if (++i == adapter->tx_ring.count) i = 0;
1315 adapter->tx_ring.next_to_use = i;
1316
1317 return true;
1318 }
1319
1320 return false;
1321}
1322
1323#define IXGB_MAX_TXD_PWR 14
1324#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1325
1326static int
1327ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1328 unsigned int first)
1329{
1330 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1331 struct pci_dev *pdev = adapter->pdev;
1332 struct ixgb_buffer *buffer_info;
1333 int len = skb_headlen(skb);
1334 unsigned int offset = 0, size, count = 0, i;
1335 unsigned int mss = skb_shinfo(skb)->gso_size;
1336 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1337 unsigned int f;
1338
1339 i = tx_ring->next_to_use;
1340
1341 while (len) {
1342 buffer_info = &tx_ring->buffer_info[i];
1343 size = min(len, IXGB_MAX_DATA_PER_TXD);
1344 /* Workaround for premature desc write-backs
1345 * in TSO mode. Append 4-byte sentinel desc */
1346 if (unlikely(mss && !nr_frags && size == len && size > 8))
1347 size -= 4;
1348
1349 buffer_info->length = size;
1350 WARN_ON(buffer_info->dma != 0);
1351 buffer_info->time_stamp = jiffies;
1352 buffer_info->mapped_as_page = false;
1353 buffer_info->dma = dma_map_single(&pdev->dev,
1354 skb->data + offset,
1355 size, DMA_TO_DEVICE);
1356 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1357 goto dma_error;
1358 buffer_info->next_to_watch = 0;
1359
1360 len -= size;
1361 offset += size;
1362 count++;
1363 if (len) {
1364 i++;
1365 if (i == tx_ring->count)
1366 i = 0;
1367 }
1368 }
1369
1370 for (f = 0; f < nr_frags; f++) {
1371 const struct skb_frag_struct *frag;
1372
1373 frag = &skb_shinfo(skb)->frags[f];
1374 len = skb_frag_size(frag);
1375 offset = 0;
1376
1377 while (len) {
1378 i++;
1379 if (i == tx_ring->count)
1380 i = 0;
1381
1382 buffer_info = &tx_ring->buffer_info[i];
1383 size = min(len, IXGB_MAX_DATA_PER_TXD);
1384
1385 /* Workaround for premature desc write-backs
1386 * in TSO mode. Append 4-byte sentinel desc */
1387 if (unlikely(mss && (f == (nr_frags - 1))
1388 && size == len && size > 8))
1389 size -= 4;
1390
1391 buffer_info->length = size;
1392 buffer_info->time_stamp = jiffies;
1393 buffer_info->mapped_as_page = true;
1394 buffer_info->dma =
1395 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1396 DMA_TO_DEVICE);
1397 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1398 goto dma_error;
1399 buffer_info->next_to_watch = 0;
1400
1401 len -= size;
1402 offset += size;
1403 count++;
1404 }
1405 }
1406 tx_ring->buffer_info[i].skb = skb;
1407 tx_ring->buffer_info[first].next_to_watch = i;
1408
1409 return count;
1410
1411dma_error:
1412 dev_err(&pdev->dev, "TX DMA map failed\n");
1413 buffer_info->dma = 0;
1414 if (count)
1415 count--;
1416
1417 while (count--) {
1418 if (i==0)
1419 i += tx_ring->count;
1420 i--;
1421 buffer_info = &tx_ring->buffer_info[i];
1422 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1423 }
1424
1425 return 0;
1426}
1427
1428static void
1429ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1430{
1431 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1432 struct ixgb_tx_desc *tx_desc = NULL;
1433 struct ixgb_buffer *buffer_info;
1434 u32 cmd_type_len = adapter->tx_cmd_type;
1435 u8 status = 0;
1436 u8 popts = 0;
1437 unsigned int i;
1438
1439 if (tx_flags & IXGB_TX_FLAGS_TSO) {
1440 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1441 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1442 }
1443
1444 if (tx_flags & IXGB_TX_FLAGS_CSUM)
1445 popts |= IXGB_TX_DESC_POPTS_TXSM;
1446
1447 if (tx_flags & IXGB_TX_FLAGS_VLAN)
1448 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1449
1450 i = tx_ring->next_to_use;
1451
1452 while (count--) {
1453 buffer_info = &tx_ring->buffer_info[i];
1454 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1455 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1456 tx_desc->cmd_type_len =
1457 cpu_to_le32(cmd_type_len | buffer_info->length);
1458 tx_desc->status = status;
1459 tx_desc->popts = popts;
1460 tx_desc->vlan = cpu_to_le16(vlan_id);
1461
1462 if (++i == tx_ring->count) i = 0;
1463 }
1464
1465 tx_desc->cmd_type_len |=
1466 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1467
1468 /* Force memory writes to complete before letting h/w
1469 * know there are new descriptors to fetch. (Only
1470 * applicable for weak-ordered memory model archs,
1471 * such as IA-64). */
1472 wmb();
1473
1474 tx_ring->next_to_use = i;
1475 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1476}
1477
1478static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1479{
1480 struct ixgb_adapter *adapter = netdev_priv(netdev);
1481 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1482
1483 netif_stop_queue(netdev);
1484 /* Herbert's original patch had:
1485 * smp_mb__after_netif_stop_queue();
1486 * but since that doesn't exist yet, just open code it. */
1487 smp_mb();
1488
1489 /* We need to check again in a case another CPU has just
1490 * made room available. */
1491 if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1492 return -EBUSY;
1493
1494 /* A reprieve! */
1495 netif_start_queue(netdev);
1496 ++adapter->restart_queue;
1497 return 0;
1498}
1499
1500static int ixgb_maybe_stop_tx(struct net_device *netdev,
1501 struct ixgb_desc_ring *tx_ring, int size)
1502{
1503 if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1504 return 0;
1505 return __ixgb_maybe_stop_tx(netdev, size);
1506}
1507
1508
1509/* Tx Descriptors needed, worst case */
1510#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1511 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1512#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1513 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1514 + 1 /* one more needed for sentinel TSO workaround */
1515
1516static netdev_tx_t
1517ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1518{
1519 struct ixgb_adapter *adapter = netdev_priv(netdev);
1520 unsigned int first;
1521 unsigned int tx_flags = 0;
1522 int vlan_id = 0;
1523 int count = 0;
1524 int tso;
1525
1526 if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1527 dev_kfree_skb_any(skb);
1528 return NETDEV_TX_OK;
1529 }
1530
1531 if (skb->len <= 0) {
1532 dev_kfree_skb_any(skb);
1533 return NETDEV_TX_OK;
1534 }
1535
1536 if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1537 DESC_NEEDED)))
1538 return NETDEV_TX_BUSY;
1539
1540 if (skb_vlan_tag_present(skb)) {
1541 tx_flags |= IXGB_TX_FLAGS_VLAN;
1542 vlan_id = skb_vlan_tag_get(skb);
1543 }
1544
1545 first = adapter->tx_ring.next_to_use;
1546
1547 tso = ixgb_tso(adapter, skb);
1548 if (tso < 0) {
1549 dev_kfree_skb_any(skb);
1550 return NETDEV_TX_OK;
1551 }
1552
1553 if (likely(tso))
1554 tx_flags |= IXGB_TX_FLAGS_TSO;
1555 else if (ixgb_tx_csum(adapter, skb))
1556 tx_flags |= IXGB_TX_FLAGS_CSUM;
1557
1558 count = ixgb_tx_map(adapter, skb, first);
1559
1560 if (count) {
1561 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1562 /* Make sure there is space in the ring for the next send. */
1563 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1564
1565 } else {
1566 dev_kfree_skb_any(skb);
1567 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1568 adapter->tx_ring.next_to_use = first;
1569 }
1570
1571 return NETDEV_TX_OK;
1572}
1573
1574/**
1575 * ixgb_tx_timeout - Respond to a Tx Hang
1576 * @netdev: network interface device structure
1577 **/
1578
1579static void
1580ixgb_tx_timeout(struct net_device *netdev)
1581{
1582 struct ixgb_adapter *adapter = netdev_priv(netdev);
1583
1584 /* Do the reset outside of interrupt context */
1585 schedule_work(&adapter->tx_timeout_task);
1586}
1587
1588static void
1589ixgb_tx_timeout_task(struct work_struct *work)
1590{
1591 struct ixgb_adapter *adapter =
1592 container_of(work, struct ixgb_adapter, tx_timeout_task);
1593
1594 adapter->tx_timeout_count++;
1595 ixgb_down(adapter, true);
1596 ixgb_up(adapter);
1597}
1598
1599/**
1600 * ixgb_get_stats - Get System Network Statistics
1601 * @netdev: network interface device structure
1602 *
1603 * Returns the address of the device statistics structure.
1604 * The statistics are actually updated from the timer callback.
1605 **/
1606
1607static struct net_device_stats *
1608ixgb_get_stats(struct net_device *netdev)
1609{
1610 return &netdev->stats;
1611}
1612
1613/**
1614 * ixgb_change_mtu - Change the Maximum Transfer Unit
1615 * @netdev: network interface device structure
1616 * @new_mtu: new value for maximum frame size
1617 *
1618 * Returns 0 on success, negative on failure
1619 **/
1620
1621static int
1622ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1623{
1624 struct ixgb_adapter *adapter = netdev_priv(netdev);
1625 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1626
1627 if (netif_running(netdev))
1628 ixgb_down(adapter, true);
1629
1630 adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1631
1632 netdev->mtu = new_mtu;
1633
1634 if (netif_running(netdev))
1635 ixgb_up(adapter);
1636
1637 return 0;
1638}
1639
1640/**
1641 * ixgb_update_stats - Update the board statistics counters.
1642 * @adapter: board private structure
1643 **/
1644
1645void
1646ixgb_update_stats(struct ixgb_adapter *adapter)
1647{
1648 struct net_device *netdev = adapter->netdev;
1649 struct pci_dev *pdev = adapter->pdev;
1650
1651 /* Prevent stats update while adapter is being reset */
1652 if (pci_channel_offline(pdev))
1653 return;
1654
1655 if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1656 (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1657 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1658 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1659 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1660 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1661
1662 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1663 /* fix up multicast stats by removing broadcasts */
1664 if (multi >= bcast)
1665 multi -= bcast;
1666
1667 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1668 adapter->stats.mprch += (multi >> 32);
1669 adapter->stats.bprcl += bcast_l;
1670 adapter->stats.bprch += bcast_h;
1671 } else {
1672 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1673 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1674 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1675 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1676 }
1677 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1678 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1679 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1680 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1681 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1682 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1683 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1684 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1685 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1686 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1687 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1688 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1689 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1690 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1691 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1692 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1693 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1694 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1695 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1696 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1697 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1698 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1699 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1700 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1701 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1702 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1703 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1704 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1705 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1706 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1707 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1708 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1709 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1710 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1711 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1712 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1713 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1714 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1715 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1716 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1717 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1718 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1719 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1720 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1721 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1722 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1723 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1724 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1725 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1726 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1727 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1728 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1729 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1730 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1731 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1732 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1733
1734 /* Fill out the OS statistics structure */
1735
1736 netdev->stats.rx_packets = adapter->stats.gprcl;
1737 netdev->stats.tx_packets = adapter->stats.gptcl;
1738 netdev->stats.rx_bytes = adapter->stats.gorcl;
1739 netdev->stats.tx_bytes = adapter->stats.gotcl;
1740 netdev->stats.multicast = adapter->stats.mprcl;
1741 netdev->stats.collisions = 0;
1742
1743 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1744 * with a length in the type/len field */
1745 netdev->stats.rx_errors =
1746 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1747 adapter->stats.ruc +
1748 adapter->stats.roc /*+ adapter->stats.rlec */ +
1749 adapter->stats.icbc +
1750 adapter->stats.ecbc + adapter->stats.mpc;
1751
1752 /* see above
1753 * netdev->stats.rx_length_errors = adapter->stats.rlec;
1754 */
1755
1756 netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1757 netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1758 netdev->stats.rx_missed_errors = adapter->stats.mpc;
1759 netdev->stats.rx_over_errors = adapter->stats.mpc;
1760
1761 netdev->stats.tx_errors = 0;
1762 netdev->stats.rx_frame_errors = 0;
1763 netdev->stats.tx_aborted_errors = 0;
1764 netdev->stats.tx_carrier_errors = 0;
1765 netdev->stats.tx_fifo_errors = 0;
1766 netdev->stats.tx_heartbeat_errors = 0;
1767 netdev->stats.tx_window_errors = 0;
1768}
1769
1770#define IXGB_MAX_INTR 10
1771/**
1772 * ixgb_intr - Interrupt Handler
1773 * @irq: interrupt number
1774 * @data: pointer to a network interface device structure
1775 **/
1776
1777static irqreturn_t
1778ixgb_intr(int irq, void *data)
1779{
1780 struct net_device *netdev = data;
1781 struct ixgb_adapter *adapter = netdev_priv(netdev);
1782 struct ixgb_hw *hw = &adapter->hw;
1783 u32 icr = IXGB_READ_REG(hw, ICR);
1784
1785 if (unlikely(!icr))
1786 return IRQ_NONE; /* Not our interrupt */
1787
1788 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1789 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1790 mod_timer(&adapter->watchdog_timer, jiffies);
1791
1792 if (napi_schedule_prep(&adapter->napi)) {
1793
1794 /* Disable interrupts and register for poll. The flush
1795 of the posted write is intentionally left out.
1796 */
1797
1798 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1799 __napi_schedule(&adapter->napi);
1800 }
1801 return IRQ_HANDLED;
1802}
1803
1804/**
1805 * ixgb_clean - NAPI Rx polling callback
1806 * @adapter: board private structure
1807 **/
1808
1809static int
1810ixgb_clean(struct napi_struct *napi, int budget)
1811{
1812 struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1813 int work_done = 0;
1814
1815 ixgb_clean_tx_irq(adapter);
1816 ixgb_clean_rx_irq(adapter, &work_done, budget);
1817
1818 /* If budget not fully consumed, exit the polling mode */
1819 if (work_done < budget) {
1820 napi_complete(napi);
1821 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1822 ixgb_irq_enable(adapter);
1823 }
1824
1825 return work_done;
1826}
1827
1828/**
1829 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1830 * @adapter: board private structure
1831 **/
1832
1833static bool
1834ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1835{
1836 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1837 struct net_device *netdev = adapter->netdev;
1838 struct ixgb_tx_desc *tx_desc, *eop_desc;
1839 struct ixgb_buffer *buffer_info;
1840 unsigned int i, eop;
1841 bool cleaned = false;
1842
1843 i = tx_ring->next_to_clean;
1844 eop = tx_ring->buffer_info[i].next_to_watch;
1845 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1846
1847 while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1848
1849 rmb(); /* read buffer_info after eop_desc */
1850 for (cleaned = false; !cleaned; ) {
1851 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1852 buffer_info = &tx_ring->buffer_info[i];
1853
1854 if (tx_desc->popts &
1855 (IXGB_TX_DESC_POPTS_TXSM |
1856 IXGB_TX_DESC_POPTS_IXSM))
1857 adapter->hw_csum_tx_good++;
1858
1859 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1860
1861 *(u32 *)&(tx_desc->status) = 0;
1862
1863 cleaned = (i == eop);
1864 if (++i == tx_ring->count) i = 0;
1865 }
1866
1867 eop = tx_ring->buffer_info[i].next_to_watch;
1868 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1869 }
1870
1871 tx_ring->next_to_clean = i;
1872
1873 if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1874 IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1875 /* Make sure that anybody stopping the queue after this
1876 * sees the new next_to_clean. */
1877 smp_mb();
1878
1879 if (netif_queue_stopped(netdev) &&
1880 !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1881 netif_wake_queue(netdev);
1882 ++adapter->restart_queue;
1883 }
1884 }
1885
1886 if (adapter->detect_tx_hung) {
1887 /* detect a transmit hang in hardware, this serializes the
1888 * check with the clearing of time_stamp and movement of i */
1889 adapter->detect_tx_hung = false;
1890 if (tx_ring->buffer_info[eop].time_stamp &&
1891 time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1892 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1893 IXGB_STATUS_TXOFF)) {
1894 /* detected Tx unit hang */
1895 netif_err(adapter, drv, adapter->netdev,
1896 "Detected Tx Unit Hang\n"
1897 " TDH <%x>\n"
1898 " TDT <%x>\n"
1899 " next_to_use <%x>\n"
1900 " next_to_clean <%x>\n"
1901 "buffer_info[next_to_clean]\n"
1902 " time_stamp <%lx>\n"
1903 " next_to_watch <%x>\n"
1904 " jiffies <%lx>\n"
1905 " next_to_watch.status <%x>\n",
1906 IXGB_READ_REG(&adapter->hw, TDH),
1907 IXGB_READ_REG(&adapter->hw, TDT),
1908 tx_ring->next_to_use,
1909 tx_ring->next_to_clean,
1910 tx_ring->buffer_info[eop].time_stamp,
1911 eop,
1912 jiffies,
1913 eop_desc->status);
1914 netif_stop_queue(netdev);
1915 }
1916 }
1917
1918 return cleaned;
1919}
1920
1921/**
1922 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1923 * @adapter: board private structure
1924 * @rx_desc: receive descriptor
1925 * @sk_buff: socket buffer with received data
1926 **/
1927
1928static void
1929ixgb_rx_checksum(struct ixgb_adapter *adapter,
1930 struct ixgb_rx_desc *rx_desc,
1931 struct sk_buff *skb)
1932{
1933 /* Ignore Checksum bit is set OR
1934 * TCP Checksum has not been calculated
1935 */
1936 if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1937 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1938 skb_checksum_none_assert(skb);
1939 return;
1940 }
1941
1942 /* At this point we know the hardware did the TCP checksum */
1943 /* now look at the TCP checksum error bit */
1944 if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1945 /* let the stack verify checksum errors */
1946 skb_checksum_none_assert(skb);
1947 adapter->hw_csum_rx_error++;
1948 } else {
1949 /* TCP checksum is good */
1950 skb->ip_summed = CHECKSUM_UNNECESSARY;
1951 adapter->hw_csum_rx_good++;
1952 }
1953}
1954
1955/*
1956 * this should improve performance for small packets with large amounts
1957 * of reassembly being done in the stack
1958 */
1959static void ixgb_check_copybreak(struct napi_struct *napi,
1960 struct ixgb_buffer *buffer_info,
1961 u32 length, struct sk_buff **skb)
1962{
1963 struct sk_buff *new_skb;
1964
1965 if (length > copybreak)
1966 return;
1967
1968 new_skb = napi_alloc_skb(napi, length);
1969 if (!new_skb)
1970 return;
1971
1972 skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1973 (*skb)->data - NET_IP_ALIGN,
1974 length + NET_IP_ALIGN);
1975 /* save the skb in buffer_info as good */
1976 buffer_info->skb = *skb;
1977 *skb = new_skb;
1978}
1979
1980/**
1981 * ixgb_clean_rx_irq - Send received data up the network stack,
1982 * @adapter: board private structure
1983 **/
1984
1985static bool
1986ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1987{
1988 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1989 struct net_device *netdev = adapter->netdev;
1990 struct pci_dev *pdev = adapter->pdev;
1991 struct ixgb_rx_desc *rx_desc, *next_rxd;
1992 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1993 u32 length;
1994 unsigned int i, j;
1995 int cleaned_count = 0;
1996 bool cleaned = false;
1997
1998 i = rx_ring->next_to_clean;
1999 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2000 buffer_info = &rx_ring->buffer_info[i];
2001
2002 while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2003 struct sk_buff *skb;
2004 u8 status;
2005
2006 if (*work_done >= work_to_do)
2007 break;
2008
2009 (*work_done)++;
2010 rmb(); /* read descriptor and rx_buffer_info after status DD */
2011 status = rx_desc->status;
2012 skb = buffer_info->skb;
2013 buffer_info->skb = NULL;
2014
2015 prefetch(skb->data - NET_IP_ALIGN);
2016
2017 if (++i == rx_ring->count)
2018 i = 0;
2019 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2020 prefetch(next_rxd);
2021
2022 j = i + 1;
2023 if (j == rx_ring->count)
2024 j = 0;
2025 next2_buffer = &rx_ring->buffer_info[j];
2026 prefetch(next2_buffer);
2027
2028 next_buffer = &rx_ring->buffer_info[i];
2029
2030 cleaned = true;
2031 cleaned_count++;
2032
2033 dma_unmap_single(&pdev->dev,
2034 buffer_info->dma,
2035 buffer_info->length,
2036 DMA_FROM_DEVICE);
2037 buffer_info->dma = 0;
2038
2039 length = le16_to_cpu(rx_desc->length);
2040 rx_desc->length = 0;
2041
2042 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2043
2044 /* All receives must fit into a single buffer */
2045
2046 pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2047 length);
2048
2049 dev_kfree_skb_irq(skb);
2050 goto rxdesc_done;
2051 }
2052
2053 if (unlikely(rx_desc->errors &
2054 (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2055 IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2056 dev_kfree_skb_irq(skb);
2057 goto rxdesc_done;
2058 }
2059
2060 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2061
2062 /* Good Receive */
2063 skb_put(skb, length);
2064
2065 /* Receive Checksum Offload */
2066 ixgb_rx_checksum(adapter, rx_desc, skb);
2067
2068 skb->protocol = eth_type_trans(skb, netdev);
2069 if (status & IXGB_RX_DESC_STATUS_VP)
2070 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2071 le16_to_cpu(rx_desc->special));
2072
2073 netif_receive_skb(skb);
2074
2075rxdesc_done:
2076 /* clean up descriptor, might be written over by hw */
2077 rx_desc->status = 0;
2078
2079 /* return some buffers to hardware, one at a time is too slow */
2080 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2081 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2082 cleaned_count = 0;
2083 }
2084
2085 /* use prefetched values */
2086 rx_desc = next_rxd;
2087 buffer_info = next_buffer;
2088 }
2089
2090 rx_ring->next_to_clean = i;
2091
2092 cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2093 if (cleaned_count)
2094 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2095
2096 return cleaned;
2097}
2098
2099/**
2100 * ixgb_alloc_rx_buffers - Replace used receive buffers
2101 * @adapter: address of board private structure
2102 **/
2103
2104static void
2105ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2106{
2107 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2108 struct net_device *netdev = adapter->netdev;
2109 struct pci_dev *pdev = adapter->pdev;
2110 struct ixgb_rx_desc *rx_desc;
2111 struct ixgb_buffer *buffer_info;
2112 struct sk_buff *skb;
2113 unsigned int i;
2114 long cleancount;
2115
2116 i = rx_ring->next_to_use;
2117 buffer_info = &rx_ring->buffer_info[i];
2118 cleancount = IXGB_DESC_UNUSED(rx_ring);
2119
2120
2121 /* leave three descriptors unused */
2122 while (--cleancount > 2 && cleaned_count--) {
2123 /* recycle! its good for you */
2124 skb = buffer_info->skb;
2125 if (skb) {
2126 skb_trim(skb, 0);
2127 goto map_skb;
2128 }
2129
2130 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2131 if (unlikely(!skb)) {
2132 /* Better luck next round */
2133 adapter->alloc_rx_buff_failed++;
2134 break;
2135 }
2136
2137 buffer_info->skb = skb;
2138 buffer_info->length = adapter->rx_buffer_len;
2139map_skb:
2140 buffer_info->dma = dma_map_single(&pdev->dev,
2141 skb->data,
2142 adapter->rx_buffer_len,
2143 DMA_FROM_DEVICE);
2144 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2145 adapter->alloc_rx_buff_failed++;
2146 break;
2147 }
2148
2149 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2150 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2151 /* guarantee DD bit not set now before h/w gets descriptor
2152 * this is the rest of the workaround for h/w double
2153 * writeback. */
2154 rx_desc->status = 0;
2155
2156
2157 if (++i == rx_ring->count)
2158 i = 0;
2159 buffer_info = &rx_ring->buffer_info[i];
2160 }
2161
2162 if (likely(rx_ring->next_to_use != i)) {
2163 rx_ring->next_to_use = i;
2164 if (unlikely(i-- == 0))
2165 i = (rx_ring->count - 1);
2166
2167 /* Force memory writes to complete before letting h/w
2168 * know there are new descriptors to fetch. (Only
2169 * applicable for weak-ordered memory model archs, such
2170 * as IA-64). */
2171 wmb();
2172 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2173 }
2174}
2175
2176static void
2177ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2178{
2179 u32 ctrl;
2180
2181 /* enable VLAN tag insert/strip */
2182 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2183 ctrl |= IXGB_CTRL0_VME;
2184 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2185}
2186
2187static void
2188ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2189{
2190 u32 ctrl;
2191
2192 /* disable VLAN tag insert/strip */
2193 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2194 ctrl &= ~IXGB_CTRL0_VME;
2195 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2196}
2197
2198static int
2199ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2200{
2201 struct ixgb_adapter *adapter = netdev_priv(netdev);
2202 u32 vfta, index;
2203
2204 /* add VID to filter table */
2205
2206 index = (vid >> 5) & 0x7F;
2207 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2208 vfta |= (1 << (vid & 0x1F));
2209 ixgb_write_vfta(&adapter->hw, index, vfta);
2210 set_bit(vid, adapter->active_vlans);
2211
2212 return 0;
2213}
2214
2215static int
2216ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2217{
2218 struct ixgb_adapter *adapter = netdev_priv(netdev);
2219 u32 vfta, index;
2220
2221 /* remove VID from filter table */
2222
2223 index = (vid >> 5) & 0x7F;
2224 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2225 vfta &= ~(1 << (vid & 0x1F));
2226 ixgb_write_vfta(&adapter->hw, index, vfta);
2227 clear_bit(vid, adapter->active_vlans);
2228
2229 return 0;
2230}
2231
2232static void
2233ixgb_restore_vlan(struct ixgb_adapter *adapter)
2234{
2235 u16 vid;
2236
2237 for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2238 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2239}
2240
2241#ifdef CONFIG_NET_POLL_CONTROLLER
2242/*
2243 * Polling 'interrupt' - used by things like netconsole to send skbs
2244 * without having to re-enable interrupts. It's not called while
2245 * the interrupt routine is executing.
2246 */
2247
2248static void ixgb_netpoll(struct net_device *dev)
2249{
2250 struct ixgb_adapter *adapter = netdev_priv(dev);
2251
2252 disable_irq(adapter->pdev->irq);
2253 ixgb_intr(adapter->pdev->irq, dev);
2254 enable_irq(adapter->pdev->irq);
2255}
2256#endif
2257
2258/**
2259 * ixgb_io_error_detected - called when PCI error is detected
2260 * @pdev: pointer to pci device with error
2261 * @state: pci channel state after error
2262 *
2263 * This callback is called by the PCI subsystem whenever
2264 * a PCI bus error is detected.
2265 */
2266static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2267 enum pci_channel_state state)
2268{
2269 struct net_device *netdev = pci_get_drvdata(pdev);
2270 struct ixgb_adapter *adapter = netdev_priv(netdev);
2271
2272 netif_device_detach(netdev);
2273
2274 if (state == pci_channel_io_perm_failure)
2275 return PCI_ERS_RESULT_DISCONNECT;
2276
2277 if (netif_running(netdev))
2278 ixgb_down(adapter, true);
2279
2280 pci_disable_device(pdev);
2281
2282 /* Request a slot reset. */
2283 return PCI_ERS_RESULT_NEED_RESET;
2284}
2285
2286/**
2287 * ixgb_io_slot_reset - called after the pci bus has been reset.
2288 * @pdev pointer to pci device with error
2289 *
2290 * This callback is called after the PCI bus has been reset.
2291 * Basically, this tries to restart the card from scratch.
2292 * This is a shortened version of the device probe/discovery code,
2293 * it resembles the first-half of the ixgb_probe() routine.
2294 */
2295static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2296{
2297 struct net_device *netdev = pci_get_drvdata(pdev);
2298 struct ixgb_adapter *adapter = netdev_priv(netdev);
2299
2300 if (pci_enable_device(pdev)) {
2301 netif_err(adapter, probe, adapter->netdev,
2302 "Cannot re-enable PCI device after reset\n");
2303 return PCI_ERS_RESULT_DISCONNECT;
2304 }
2305
2306 /* Perform card reset only on one instance of the card */
2307 if (0 != PCI_FUNC (pdev->devfn))
2308 return PCI_ERS_RESULT_RECOVERED;
2309
2310 pci_set_master(pdev);
2311
2312 netif_carrier_off(netdev);
2313 netif_stop_queue(netdev);
2314 ixgb_reset(adapter);
2315
2316 /* Make sure the EEPROM is good */
2317 if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2318 netif_err(adapter, probe, adapter->netdev,
2319 "After reset, the EEPROM checksum is not valid\n");
2320 return PCI_ERS_RESULT_DISCONNECT;
2321 }
2322 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2323 memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2324
2325 if (!is_valid_ether_addr(netdev->perm_addr)) {
2326 netif_err(adapter, probe, adapter->netdev,
2327 "After reset, invalid MAC address\n");
2328 return PCI_ERS_RESULT_DISCONNECT;
2329 }
2330
2331 return PCI_ERS_RESULT_RECOVERED;
2332}
2333
2334/**
2335 * ixgb_io_resume - called when its OK to resume normal operations
2336 * @pdev pointer to pci device with error
2337 *
2338 * The error recovery driver tells us that its OK to resume
2339 * normal operation. Implementation resembles the second-half
2340 * of the ixgb_probe() routine.
2341 */
2342static void ixgb_io_resume(struct pci_dev *pdev)
2343{
2344 struct net_device *netdev = pci_get_drvdata(pdev);
2345 struct ixgb_adapter *adapter = netdev_priv(netdev);
2346
2347 pci_set_master(pdev);
2348
2349 if (netif_running(netdev)) {
2350 if (ixgb_up(adapter)) {
2351 pr_err("can't bring device back up after reset\n");
2352 return;
2353 }
2354 }
2355
2356 netif_device_attach(netdev);
2357 mod_timer(&adapter->watchdog_timer, jiffies);
2358}
2359
2360/* ixgb_main.c */