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[PATCH] ixgb: correct rx_dropped counting
[linux-block.git] / drivers / net / ixgb / ixgb_main.c
CommitLineData
1da177e4
LT		 1/*******************************************************************************
2
3
4 Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2 of the License, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 You should have received a copy of the GNU General Public License along with
17 this program; if not, write to the Free Software Foundation, Inc., 59
18 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19
20 The full GNU General Public License is included in this distribution in the
21 file called LICENSE.
22
23 Contact Information:
24 Linux NICS <linux.nics@intel.com>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27*******************************************************************************/
28
29#include "ixgb.h"
30
31/* Change Log
ab707da7
MC		 32 * 1.0.96 04/19/05
33 * - Make needlessly global code static -- bunk@stusta.de
34 * - ethtool cleanup -- shemminger@osdl.org
35 * - Support for MODULE_VERSION -- linville@tuxdriver.com
36 * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
1da177e4
LT		 37 * 1.0.88 01/05/05
38 * - include fix to the condition that determines when to quit NAPI - Robert Olsson
39 * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
40 * 1.0.84 10/26/04
41 * - reset buffer_info->dma in Tx resource cleanup logic
42 * 1.0.83 10/12/04
43 * - sparse cleanup - shemminger@osdl.org
44 * - fix tx resource cleanup logic
45 */
46
47char ixgb_driver_name[] = "ixgb";
48char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
49
50#ifndef CONFIG_IXGB_NAPI
51#define DRIVERNAPI
52#else
53#define DRIVERNAPI "-NAPI"
54#endif
ab707da7 55#define DRV_VERSION "1.0.100-k2"DRIVERNAPI
01e5abc2 56char ixgb_driver_version[] = DRV_VERSION;
ab707da7 57static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
1da177e4
LT		 58
59/* ixgb_pci_tbl - PCI Device ID Table
60 *
61 * Wildcard entries (PCI_ANY_ID) should come last
62 * Last entry must be all 0s
63 *
64 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
65 * Class, Class Mask, private data (not used) }
66 */
67static struct pci_device_id ixgb_pci_tbl[] = {
68 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
69 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
70 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
71 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
72 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
73 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
74
75 /* required last entry */
76 {0,}
77};
78
79MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
80
81/* Local Function Prototypes */
82
83int ixgb_up(struct ixgb_adapter *adapter);
84void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
85void ixgb_reset(struct ixgb_adapter *adapter);
86int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
87int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
88void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
89void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
90void ixgb_update_stats(struct ixgb_adapter *adapter);
91
92static int ixgb_init_module(void);
93static void ixgb_exit_module(void);
94static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
95static void __devexit ixgb_remove(struct pci_dev *pdev);
96static int ixgb_sw_init(struct ixgb_adapter *adapter);
97static int ixgb_open(struct net_device *netdev);
98static int ixgb_close(struct net_device *netdev);
99static void ixgb_configure_tx(struct ixgb_adapter *adapter);
100static void ixgb_configure_rx(struct ixgb_adapter *adapter);
101static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
102static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
103static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
104static void ixgb_set_multi(struct net_device *netdev);
105static void ixgb_watchdog(unsigned long data);
106static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
107static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
108static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
109static int ixgb_set_mac(struct net_device *netdev, void *p);
110static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
111static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
ac79c82e 112
1da177e4
LT		 113#ifdef CONFIG_IXGB_NAPI
114static int ixgb_clean(struct net_device *netdev, int *budget);
115static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
116 int *work_done, int work_to_do);
117#else
118static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
119#endif
120static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
121void ixgb_set_ethtool_ops(struct net_device *netdev);
122static void ixgb_tx_timeout(struct net_device *dev);
123static void ixgb_tx_timeout_task(struct net_device *dev);
124static void ixgb_vlan_rx_register(struct net_device *netdev,
125 struct vlan_group *grp);
126static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
127static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
128static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
129
1da177e4
LT		 130#ifdef CONFIG_NET_POLL_CONTROLLER
131/* for netdump / net console */
132static void ixgb_netpoll(struct net_device *dev);
133#endif
134
1da177e4
LT		 135/* Exported from other modules */
136
137extern void ixgb_check_options(struct ixgb_adapter *adapter);
138
139static struct pci_driver ixgb_driver = {
c2eba932 140 .name = ixgb_driver_name,
1da177e4 141 .id_table = ixgb_pci_tbl,
c2eba932
MC		 142 .probe = ixgb_probe,
143 .remove = __devexit_p(ixgb_remove),
1da177e4
LT		 144};
145
146MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
147MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
148MODULE_LICENSE("GPL");
01e5abc2 149MODULE_VERSION(DRV_VERSION);
1da177e4
LT		 150
151/* some defines for controlling descriptor fetches in h/w */
1da177e4 152#define RXDCTL_WTHRESH_DEFAULT 16 /* chip writes back at this many or RXT0 */
9c15d24f
MC		 153#define RXDCTL_PTHRESH_DEFAULT 0 /* chip considers prefech below
154 * this */
155#define RXDCTL_HTHRESH_DEFAULT 0 /* chip will only prefetch if tail
156 * is pushed this many descriptors
157 * from head */
1da177e4
LT		 158
159/**
160 * ixgb_init_module - Driver Registration Routine
161 *
162 * ixgb_init_module is the first routine called when the driver is
163 * loaded. All it does is register with the PCI subsystem.
164 **/
165
166static int __init
167ixgb_init_module(void)
168{
1da177e4
LT		 169 printk(KERN_INFO "%s - version %s\n",
170 ixgb_driver_string, ixgb_driver_version);
171
172 printk(KERN_INFO "%s\n", ixgb_copyright);
173
c2eba932 174 return pci_module_init(&ixgb_driver);
1da177e4
LT		 175}
176
177module_init(ixgb_init_module);
178
179/**
180 * ixgb_exit_module - Driver Exit Cleanup Routine
181 *
182 * ixgb_exit_module is called just before the driver is removed
183 * from memory.
184 **/
185
186static void __exit
187ixgb_exit_module(void)
188{
1da177e4
LT		 189 pci_unregister_driver(&ixgb_driver);
190}
191
192module_exit(ixgb_exit_module);
193
194/**
195 * ixgb_irq_disable - Mask off interrupt generation on the NIC
196 * @adapter: board private structure
197 **/
198
199static inline void
200ixgb_irq_disable(struct ixgb_adapter *adapter)
201{
202 atomic_inc(&adapter->irq_sem);
203 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
204 IXGB_WRITE_FLUSH(&adapter->hw);
205 synchronize_irq(adapter->pdev->irq);
206}
207
208/**
209 * ixgb_irq_enable - Enable default interrupt generation settings
210 * @adapter: board private structure
211 **/
212
213static inline void
214ixgb_irq_enable(struct ixgb_adapter *adapter)
215{
216 if(atomic_dec_and_test(&adapter->irq_sem)) {
217 IXGB_WRITE_REG(&adapter->hw, IMS,
6dfbb6dd
MC		 218 IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
219 IXGB_INT_LSC);
1da177e4
LT		 220 IXGB_WRITE_FLUSH(&adapter->hw);
221 }
222}
223
224int
225ixgb_up(struct ixgb_adapter *adapter)
226{
227 struct net_device *netdev = adapter->netdev;
228 int err;
229 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
230 struct ixgb_hw *hw = &adapter->hw;
231
232 /* hardware has been reset, we need to reload some things */
233
234 ixgb_set_multi(netdev);
235
236 ixgb_restore_vlan(adapter);
237
238 ixgb_configure_tx(adapter);
239 ixgb_setup_rctl(adapter);
240 ixgb_configure_rx(adapter);
241 ixgb_alloc_rx_buffers(adapter);
242
243#ifdef CONFIG_PCI_MSI
244 {
245 boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
246 IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
247 adapter->have_msi = TRUE;
248
249 if (!pcix)
250 adapter->have_msi = FALSE;
251 else if((err = pci_enable_msi(adapter->pdev))) {
252 printk (KERN_ERR
253 "Unable to allocate MSI interrupt Error: %d\n", err);
254 adapter->have_msi = FALSE;
255 /* proceed to try to request regular interrupt */
256 }
257 }
258
259#endif
260 if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
261 SA_SHIRQ | SA_SAMPLE_RANDOM,
262 netdev->name, netdev)))
263 return err;
264
265 /* disable interrupts and get the hardware into a known state */
266 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
267
268 if((hw->max_frame_size != max_frame) ||
269 (hw->max_frame_size !=
270 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
271
272 hw->max_frame_size = max_frame;
273
274 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
275
276 if(hw->max_frame_size >
277 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
278 uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
279
280 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
281 ctrl0 |= IXGB_CTRL0_JFE;
282 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
283 }
284 }
285 }
286
287 mod_timer(&adapter->watchdog_timer, jiffies);
288 ixgb_irq_enable(adapter);
289
290#ifdef CONFIG_IXGB_NAPI
291 netif_poll_enable(netdev);
292#endif
293 return 0;
294}
295
296void
297ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
298{
299 struct net_device *netdev = adapter->netdev;
300
301 ixgb_irq_disable(adapter);
302 free_irq(adapter->pdev->irq, netdev);
303#ifdef CONFIG_PCI_MSI
304 if(adapter->have_msi == TRUE)
305 pci_disable_msi(adapter->pdev);
306
307#endif
308 if(kill_watchdog)
309 del_timer_sync(&adapter->watchdog_timer);
310#ifdef CONFIG_IXGB_NAPI
311 netif_poll_disable(netdev);
312#endif
313 adapter->link_speed = 0;
314 adapter->link_duplex = 0;
315 netif_carrier_off(netdev);
316 netif_stop_queue(netdev);
317
318 ixgb_reset(adapter);
319 ixgb_clean_tx_ring(adapter);
320 ixgb_clean_rx_ring(adapter);
321}
322
323void
324ixgb_reset(struct ixgb_adapter *adapter)
325{
326
327 ixgb_adapter_stop(&adapter->hw);
328 if(!ixgb_init_hw(&adapter->hw))
329 IXGB_DBG("ixgb_init_hw failed.\n");
330}
331
332/**
333 * ixgb_probe - Device Initialization Routine
334 * @pdev: PCI device information struct
335 * @ent: entry in ixgb_pci_tbl
336 *
337 * Returns 0 on success, negative on failure
338 *
339 * ixgb_probe initializes an adapter identified by a pci_dev structure.
340 * The OS initialization, configuring of the adapter private structure,
341 * and a hardware reset occur.
342 **/
343
344static int __devinit
345ixgb_probe(struct pci_dev *pdev,
346 const struct pci_device_id *ent)
347{
348 struct net_device *netdev = NULL;
349 struct ixgb_adapter *adapter;
350 static int cards_found = 0;
351 unsigned long mmio_start;
352 int mmio_len;
353 int pci_using_dac;
354 int i;
355 int err;
356
357 if((err = pci_enable_device(pdev)))
358 return err;
359
360 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
361 pci_using_dac = 1;
362 } else {
363 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
364 IXGB_ERR("No usable DMA configuration, aborting\n");
365 return err;
366 }
367 pci_using_dac = 0;
368 }
369
370 if((err = pci_request_regions(pdev, ixgb_driver_name)))
371 return err;
372
373 pci_set_master(pdev);
374
375 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
376 if(!netdev) {
377 err = -ENOMEM;
378 goto err_alloc_etherdev;
379 }
380
381 SET_MODULE_OWNER(netdev);
382 SET_NETDEV_DEV(netdev, &pdev->dev);
383
384 pci_set_drvdata(pdev, netdev);
8908c6cd 385 adapter = netdev_priv(netdev);
1da177e4
LT		 386 adapter->netdev = netdev;
387 adapter->pdev = pdev;
388 adapter->hw.back = adapter;
389
390 mmio_start = pci_resource_start(pdev, BAR_0);
391 mmio_len = pci_resource_len(pdev, BAR_0);
392
393 adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
394 if(!adapter->hw.hw_addr) {
395 err = -EIO;
396 goto err_ioremap;
397 }
398
399 for(i = BAR_1; i <= BAR_5; i++) {
400 if(pci_resource_len(pdev, i) == 0)
401 continue;
402 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
403 adapter->hw.io_base = pci_resource_start(pdev, i);
404 break;
405 }
406 }
407
408 netdev->open = &ixgb_open;
409 netdev->stop = &ixgb_close;
410 netdev->hard_start_xmit = &ixgb_xmit_frame;
411 netdev->get_stats = &ixgb_get_stats;
412 netdev->set_multicast_list = &ixgb_set_multi;
413 netdev->set_mac_address = &ixgb_set_mac;
414 netdev->change_mtu = &ixgb_change_mtu;
415 ixgb_set_ethtool_ops(netdev);
416 netdev->tx_timeout = &ixgb_tx_timeout;
417 netdev->watchdog_timeo = HZ;
418#ifdef CONFIG_IXGB_NAPI
419 netdev->poll = &ixgb_clean;
420 netdev->weight = 64;
421#endif
422 netdev->vlan_rx_register = ixgb_vlan_rx_register;
423 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
424 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
425#ifdef CONFIG_NET_POLL_CONTROLLER
426 netdev->poll_controller = ixgb_netpoll;
427#endif
428
429 netdev->mem_start = mmio_start;
430 netdev->mem_end = mmio_start + mmio_len;
431 netdev->base_addr = adapter->hw.io_base;
432
433 adapter->bd_number = cards_found;
434 adapter->link_speed = 0;
435 adapter->link_duplex = 0;
436
437 /* setup the private structure */
438
439 if((err = ixgb_sw_init(adapter)))
440 goto err_sw_init;
441
442 netdev->features = NETIF_F_SG |
443 NETIF_F_HW_CSUM |
444 NETIF_F_HW_VLAN_TX |
445 NETIF_F_HW_VLAN_RX |
446 NETIF_F_HW_VLAN_FILTER;
447#ifdef NETIF_F_TSO
448 netdev->features |= NETIF_F_TSO;
449#endif
450
451 if(pci_using_dac)
452 netdev->features |= NETIF_F_HIGHDMA;
453
454 /* make sure the EEPROM is good */
455
456 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
457 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
458 err = -EIO;
459 goto err_eeprom;
460 }
461
462 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
463
464 if(!is_valid_ether_addr(netdev->dev_addr)) {
465 err = -EIO;
466 goto err_eeprom;
467 }
468
469 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
470
471 init_timer(&adapter->watchdog_timer);
472 adapter->watchdog_timer.function = &ixgb_watchdog;
473 adapter->watchdog_timer.data = (unsigned long)adapter;
474
475 INIT_WORK(&adapter->tx_timeout_task,
476 (void (*)(void *))ixgb_tx_timeout_task, netdev);
477
478 if((err = register_netdev(netdev)))
479 goto err_register;
480
481 /* we're going to reset, so assume we have no link for now */
482
483 netif_carrier_off(netdev);
484 netif_stop_queue(netdev);
485
486 printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
487 netdev->name);
488 ixgb_check_options(adapter);
489 /* reset the hardware with the new settings */
490
491 ixgb_reset(adapter);
492
493 cards_found++;
494 return 0;
495
496err_register:
497err_sw_init:
498err_eeprom:
499 iounmap(adapter->hw.hw_addr);
500err_ioremap:
501 free_netdev(netdev);
502err_alloc_etherdev:
503 pci_release_regions(pdev);
504 return err;
505}
506
507/**
508 * ixgb_remove - Device Removal Routine
509 * @pdev: PCI device information struct
510 *
511 * ixgb_remove is called by the PCI subsystem to alert the driver
512 * that it should release a PCI device. The could be caused by a
513 * Hot-Plug event, or because the driver is going to be removed from
514 * memory.
515 **/
516
517static void __devexit
518ixgb_remove(struct pci_dev *pdev)
519{
520 struct net_device *netdev = pci_get_drvdata(pdev);
8908c6cd 521 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 522
523 unregister_netdev(netdev);
524
525 iounmap(adapter->hw.hw_addr);
526 pci_release_regions(pdev);
527
528 free_netdev(netdev);
529}
530
531/**
532 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
533 * @adapter: board private structure to initialize
534 *
535 * ixgb_sw_init initializes the Adapter private data structure.
536 * Fields are initialized based on PCI device information and
537 * OS network device settings (MTU size).
538 **/
539
540static int __devinit
541ixgb_sw_init(struct ixgb_adapter *adapter)
542{
543 struct ixgb_hw *hw = &adapter->hw;
544 struct net_device *netdev = adapter->netdev;
545 struct pci_dev *pdev = adapter->pdev;
546
547 /* PCI config space info */
548
549 hw->vendor_id = pdev->vendor;
550 hw->device_id = pdev->device;
551 hw->subsystem_vendor_id = pdev->subsystem_vendor;
552 hw->subsystem_id = pdev->subsystem_device;
553
554 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
555
556 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
557
558 if((hw->device_id == IXGB_DEVICE_ID_82597EX)
559 ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
560 ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
561 hw->mac_type = ixgb_82597;
562 else {
563 /* should never have loaded on this device */
564 printk(KERN_ERR "ixgb: unsupported device id\n");
565 }
566
567 /* enable flow control to be programmed */
568 hw->fc.send_xon = 1;
569
570 atomic_set(&adapter->irq_sem, 1);
571 spin_lock_init(&adapter->tx_lock);
572
573 return 0;
574}
575
576/**
577 * ixgb_open - Called when a network interface is made active
578 * @netdev: network interface device structure
579 *
580 * Returns 0 on success, negative value on failure
581 *
582 * The open entry point is called when a network interface is made
583 * active by the system (IFF_UP). At this point all resources needed
584 * for transmit and receive operations are allocated, the interrupt
585 * handler is registered with the OS, the watchdog timer is started,
586 * and the stack is notified that the interface is ready.
587 **/
588
589static int
590ixgb_open(struct net_device *netdev)
591{
8908c6cd 592 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 593 int err;
594
595 /* allocate transmit descriptors */
596
597 if((err = ixgb_setup_tx_resources(adapter)))
598 goto err_setup_tx;
599
600 /* allocate receive descriptors */
601
602 if((err = ixgb_setup_rx_resources(adapter)))
603 goto err_setup_rx;
604
605 if((err = ixgb_up(adapter)))
606 goto err_up;
607
608 return 0;
609
610err_up:
611 ixgb_free_rx_resources(adapter);
612err_setup_rx:
613 ixgb_free_tx_resources(adapter);
614err_setup_tx:
615 ixgb_reset(adapter);
616
617 return err;
618}
619
620/**
621 * ixgb_close - Disables a network interface
622 * @netdev: network interface device structure
623 *
624 * Returns 0, this is not allowed to fail
625 *
626 * The close entry point is called when an interface is de-activated
627 * by the OS. The hardware is still under the drivers control, but
628 * needs to be disabled. A global MAC reset is issued to stop the
629 * hardware, and all transmit and receive resources are freed.
630 **/
631
632static int
633ixgb_close(struct net_device *netdev)
634{
8908c6cd 635 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 636
637 ixgb_down(adapter, TRUE);
638
639 ixgb_free_tx_resources(adapter);
640 ixgb_free_rx_resources(adapter);
641
642 return 0;
643}
644
645/**
646 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
647 * @adapter: board private structure
648 *
649 * Return 0 on success, negative on failure
650 **/
651
652int
653ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
654{
655 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
656 struct pci_dev *pdev = adapter->pdev;
657 int size;
658
659 size = sizeof(struct ixgb_buffer) * txdr->count;
660 txdr->buffer_info = vmalloc(size);
661 if(!txdr->buffer_info) {
662 return -ENOMEM;
663 }
664 memset(txdr->buffer_info, 0, size);
665
666 /* round up to nearest 4K */
667
668 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
669 IXGB_ROUNDUP(txdr->size, 4096);
670
671 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
672 if(!txdr->desc) {
673 vfree(txdr->buffer_info);
674 return -ENOMEM;
675 }
676 memset(txdr->desc, 0, txdr->size);
677
678 txdr->next_to_use = 0;
679 txdr->next_to_clean = 0;
680
681 return 0;
682}
683
684/**
685 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
686 * @adapter: board private structure
687 *
688 * Configure the Tx unit of the MAC after a reset.
689 **/
690
691static void
692ixgb_configure_tx(struct ixgb_adapter *adapter)
693{
694 uint64_t tdba = adapter->tx_ring.dma;
695 uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
696 uint32_t tctl;
697 struct ixgb_hw *hw = &adapter->hw;
698
699 /* Setup the Base and Length of the Tx Descriptor Ring
700 * tx_ring.dma can be either a 32 or 64 bit value
701 */
702
703 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
704 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
705
706 IXGB_WRITE_REG(hw, TDLEN, tdlen);
707
708 /* Setup the HW Tx Head and Tail descriptor pointers */
709
710 IXGB_WRITE_REG(hw, TDH, 0);
711 IXGB_WRITE_REG(hw, TDT, 0);
712
713 /* don't set up txdctl, it induces performance problems if configured
714 * incorrectly */
715 /* Set the Tx Interrupt Delay register */
716
717 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
718
719 /* Program the Transmit Control Register */
720
721 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
722 IXGB_WRITE_REG(hw, TCTL, tctl);
723
724 /* Setup Transmit Descriptor Settings for this adapter */
725 adapter->tx_cmd_type =
726 IXGB_TX_DESC_TYPE
727 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
728}
729
730/**
731 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
732 * @adapter: board private structure
733 *
734 * Returns 0 on success, negative on failure
735 **/
736
737int
738ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
739{
740 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
741 struct pci_dev *pdev = adapter->pdev;
742 int size;
743
744 size = sizeof(struct ixgb_buffer) * rxdr->count;
745 rxdr->buffer_info = vmalloc(size);
746 if(!rxdr->buffer_info) {
747 return -ENOMEM;
748 }
749 memset(rxdr->buffer_info, 0, size);
750
751 /* Round up to nearest 4K */
752
753 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
754 IXGB_ROUNDUP(rxdr->size, 4096);
755
756 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
757
758 if(!rxdr->desc) {
759 vfree(rxdr->buffer_info);
760 return -ENOMEM;
761 }
762 memset(rxdr->desc, 0, rxdr->size);
763
764 rxdr->next_to_clean = 0;
765 rxdr->next_to_use = 0;
766
767 return 0;
768}
769
770/**
771 * ixgb_setup_rctl - configure the receive control register
772 * @adapter: Board private structure
773 **/
774
775static void
776ixgb_setup_rctl(struct ixgb_adapter *adapter)
777{
778 uint32_t rctl;
779
780 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
781
782 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
783
784 rctl |=
785 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
786 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
787 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
788
789 rctl |= IXGB_RCTL_SECRC;
790
791 switch (adapter->rx_buffer_len) {
792 case IXGB_RXBUFFER_2048:
793 default:
794 rctl |= IXGB_RCTL_BSIZE_2048;
795 break;
796 case IXGB_RXBUFFER_4096:
797 rctl |= IXGB_RCTL_BSIZE_4096;
798 break;
799 case IXGB_RXBUFFER_8192:
800 rctl |= IXGB_RCTL_BSIZE_8192;
801 break;
802 case IXGB_RXBUFFER_16384:
803 rctl |= IXGB_RCTL_BSIZE_16384;
804 break;
805 }
806
807 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
808}
809
810/**
811 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
812 * @adapter: board private structure
813 *
814 * Configure the Rx unit of the MAC after a reset.
815 **/
816
817static void
818ixgb_configure_rx(struct ixgb_adapter *adapter)
819{
820 uint64_t rdba = adapter->rx_ring.dma;
821 uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
822 struct ixgb_hw *hw = &adapter->hw;
823 uint32_t rctl;
824 uint32_t rxcsum;
825 uint32_t rxdctl;
826
827 /* make sure receives are disabled while setting up the descriptors */
828
829 rctl = IXGB_READ_REG(hw, RCTL);
830 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
831
832 /* set the Receive Delay Timer Register */
833
834 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
835
836 /* Setup the Base and Length of the Rx Descriptor Ring */
837
838 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
839 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
840
841 IXGB_WRITE_REG(hw, RDLEN, rdlen);
842
843 /* Setup the HW Rx Head and Tail Descriptor Pointers */
844 IXGB_WRITE_REG(hw, RDH, 0);
845 IXGB_WRITE_REG(hw, RDT, 0);
846
847 /* set up pre-fetching of receive buffers so we get some before we
848 * run out (default hardware behavior is to run out before fetching
849 * more). This sets up to fetch if HTHRESH rx descriptors are avail
850 * and the descriptors in hw cache are below PTHRESH. This avoids
851 * the hardware behavior of fetching <=512 descriptors in a single
852 * burst that pre-empts all other activity, usually causing fifo
853 * overflows. */
854 /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
855 rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
856 RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
857 RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
858 IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
859
860 /* Enable Receive Checksum Offload for TCP and UDP */
861 if(adapter->rx_csum == TRUE) {
862 rxcsum = IXGB_READ_REG(hw, RXCSUM);
863 rxcsum |= IXGB_RXCSUM_TUOFL;
864 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
865 }
866
867 /* Enable Receives */
868
869 IXGB_WRITE_REG(hw, RCTL, rctl);
870}
871
872/**
873 * ixgb_free_tx_resources - Free Tx Resources
874 * @adapter: board private structure
875 *
876 * Free all transmit software resources
877 **/
878
879void
880ixgb_free_tx_resources(struct ixgb_adapter *adapter)
881{
882 struct pci_dev *pdev = adapter->pdev;
883
884 ixgb_clean_tx_ring(adapter);
885
886 vfree(adapter->tx_ring.buffer_info);
887 adapter->tx_ring.buffer_info = NULL;
888
889 pci_free_consistent(pdev, adapter->tx_ring.size,
890 adapter->tx_ring.desc, adapter->tx_ring.dma);
891
892 adapter->tx_ring.desc = NULL;
893}
894
895static inline void
896ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
897 struct ixgb_buffer *buffer_info)
898{
899 struct pci_dev *pdev = adapter->pdev;
900 if(buffer_info->dma) {
901 pci_unmap_page(pdev,
902 buffer_info->dma,
903 buffer_info->length,
904 PCI_DMA_TODEVICE);
905 buffer_info->dma = 0;
906 }
907 if(buffer_info->skb) {
908 dev_kfree_skb_any(buffer_info->skb);
909 buffer_info->skb = NULL;
910 }
911}
912
913/**
914 * ixgb_clean_tx_ring - Free Tx Buffers
915 * @adapter: board private structure
916 **/
917
918static void
919ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
920{
921 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
922 struct ixgb_buffer *buffer_info;
923 unsigned long size;
924 unsigned int i;
925
926 /* Free all the Tx ring sk_buffs */
927
928 for(i = 0; i < tx_ring->count; i++) {
929 buffer_info = &tx_ring->buffer_info[i];
930 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
931 }
932
933 size = sizeof(struct ixgb_buffer) * tx_ring->count;
934 memset(tx_ring->buffer_info, 0, size);
935
936 /* Zero out the descriptor ring */
937
938 memset(tx_ring->desc, 0, tx_ring->size);
939
940 tx_ring->next_to_use = 0;
941 tx_ring->next_to_clean = 0;
942
943 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
944 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
945}
946
947/**
948 * ixgb_free_rx_resources - Free Rx Resources
949 * @adapter: board private structure
950 *
951 * Free all receive software resources
952 **/
953
954void
955ixgb_free_rx_resources(struct ixgb_adapter *adapter)
956{
957 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
958 struct pci_dev *pdev = adapter->pdev;
959
960 ixgb_clean_rx_ring(adapter);
961
962 vfree(rx_ring->buffer_info);
963 rx_ring->buffer_info = NULL;
964
965 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
966
967 rx_ring->desc = NULL;
968}
969
970/**
971 * ixgb_clean_rx_ring - Free Rx Buffers
972 * @adapter: board private structure
973 **/
974
975static void
976ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
977{
978 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
979 struct ixgb_buffer *buffer_info;
980 struct pci_dev *pdev = adapter->pdev;
981 unsigned long size;
982 unsigned int i;
983
984 /* Free all the Rx ring sk_buffs */
985
986 for(i = 0; i < rx_ring->count; i++) {
987 buffer_info = &rx_ring->buffer_info[i];
988 if(buffer_info->skb) {
989
990 pci_unmap_single(pdev,
991 buffer_info->dma,
992 buffer_info->length,
993 PCI_DMA_FROMDEVICE);
994
995 dev_kfree_skb(buffer_info->skb);
996
997 buffer_info->skb = NULL;
998 }
999 }
1000
1001 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1002 memset(rx_ring->buffer_info, 0, size);
1003
1004 /* Zero out the descriptor ring */
1005
1006 memset(rx_ring->desc, 0, rx_ring->size);
1007
1008 rx_ring->next_to_clean = 0;
1009 rx_ring->next_to_use = 0;
1010
1011 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1012 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1013}
1014
1015/**
1016 * ixgb_set_mac - Change the Ethernet Address of the NIC
1017 * @netdev: network interface device structure
1018 * @p: pointer to an address structure
1019 *
1020 * Returns 0 on success, negative on failure
1021 **/
1022
1023static int
1024ixgb_set_mac(struct net_device *netdev, void *p)
1025{
8908c6cd 1026 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1027 struct sockaddr *addr = p;
1028
1029 if(!is_valid_ether_addr(addr->sa_data))
1030 return -EADDRNOTAVAIL;
1031
1032 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1033
1034 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1035
1036 return 0;
1037}
1038
1039/**
1040 * ixgb_set_multi - Multicast and Promiscuous mode set
1041 * @netdev: network interface device structure
1042 *
1043 * The set_multi entry point is called whenever the multicast address
1044 * list or the network interface flags are updated. This routine is
1045 * responsible for configuring the hardware for proper multicast,
1046 * promiscuous mode, and all-multi behavior.
1047 **/
1048
1049static void
1050ixgb_set_multi(struct net_device *netdev)
1051{
8908c6cd 1052 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1053 struct ixgb_hw *hw = &adapter->hw;
1054 struct dev_mc_list *mc_ptr;
1055 uint32_t rctl;
1056 int i;
1057
1058 /* Check for Promiscuous and All Multicast modes */
1059
1060 rctl = IXGB_READ_REG(hw, RCTL);
1061
1062 if(netdev->flags & IFF_PROMISC) {
1063 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1064 } else if(netdev->flags & IFF_ALLMULTI) {
1065 rctl |= IXGB_RCTL_MPE;
1066 rctl &= ~IXGB_RCTL_UPE;
1067 } else {
1068 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1069 }
1070
1071 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1072 rctl |= IXGB_RCTL_MPE;
1073 IXGB_WRITE_REG(hw, RCTL, rctl);
1074 } else {
1075 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1076
1077 IXGB_WRITE_REG(hw, RCTL, rctl);
1078
1079 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1080 i++, mc_ptr = mc_ptr->next)
1081 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1082 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1083
1084 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1085 }
1086}
1087
1088/**
1089 * ixgb_watchdog - Timer Call-back
1090 * @data: pointer to netdev cast into an unsigned long
1091 **/
1092
1093static void
1094ixgb_watchdog(unsigned long data)
1095{
1096 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1097 struct net_device *netdev = adapter->netdev;
1098 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1099
1100 ixgb_check_for_link(&adapter->hw);
1101
1102 if (ixgb_check_for_bad_link(&adapter->hw)) {
1103 /* force the reset path */
1104 netif_stop_queue(netdev);
1105 }
1106
1107 if(adapter->hw.link_up) {
1108 if(!netif_carrier_ok(netdev)) {
1109 printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1110 netdev->name, 10000, "Full Duplex");
1111 adapter->link_speed = 10000;
1112 adapter->link_duplex = FULL_DUPLEX;
1113 netif_carrier_on(netdev);
1114 netif_wake_queue(netdev);
1115 }
1116 } else {
1117 if(netif_carrier_ok(netdev)) {
1118 adapter->link_speed = 0;
1119 adapter->link_duplex = 0;
1120 printk(KERN_INFO
1121 "ixgb: %s NIC Link is Down\n",
1122 netdev->name);
1123 netif_carrier_off(netdev);
1124 netif_stop_queue(netdev);
1125
1126 }
1127 }
1128
1129 ixgb_update_stats(adapter);
1130
1131 if(!netif_carrier_ok(netdev)) {
1132 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1133 /* We've lost link, so the controller stops DMA,
1134 * but we've got queued Tx work that's never going
1135 * to get done, so reset controller to flush Tx.
1136 * (Do the reset outside of interrupt context). */
1137 schedule_work(&adapter->tx_timeout_task);
1138 }
1139 }
1140
1141 /* Force detection of hung controller every watchdog period */
1142 adapter->detect_tx_hung = TRUE;
1143
1144 /* generate an interrupt to force clean up of any stragglers */
1145 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1146
1147 /* Reset the timer */
1148 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1149}
1150
1151#define IXGB_TX_FLAGS_CSUM 0x00000001
1152#define IXGB_TX_FLAGS_VLAN 0x00000002
1153#define IXGB_TX_FLAGS_TSO 0x00000004
1154
1155static inline int
1156ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1157{
1158#ifdef NETIF_F_TSO
1159 struct ixgb_context_desc *context_desc;
1160 unsigned int i;
1161 uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1162 uint16_t ipcse, tucse, mss;
1163 int err;
1164
1165 if(likely(skb_shinfo(skb)->tso_size)) {
1166 if (skb_header_cloned(skb)) {
1167 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1168 if (err)
1169 return err;
1170 }
1171
1172 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1173 mss = skb_shinfo(skb)->tso_size;
1174 skb->nh.iph->tot_len = 0;
1175 skb->nh.iph->check = 0;
1176 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1177 skb->nh.iph->daddr,
1178 0, IPPROTO_TCP, 0);
1179 ipcss = skb->nh.raw - skb->data;
1180 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1181 ipcse = skb->h.raw - skb->data - 1;
1182 tucss = skb->h.raw - skb->data;
1183 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1184 tucse = 0;
1185
1186 i = adapter->tx_ring.next_to_use;
1187 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1188
1189 context_desc->ipcss = ipcss;
1190 context_desc->ipcso = ipcso;
1191 context_desc->ipcse = cpu_to_le16(ipcse);
1192 context_desc->tucss = tucss;
1193 context_desc->tucso = tucso;
1194 context_desc->tucse = cpu_to_le16(tucse);
1195 context_desc->mss = cpu_to_le16(mss);
1196 context_desc->hdr_len = hdr_len;
1197 context_desc->status = 0;
1198 context_desc->cmd_type_len = cpu_to_le32(
1199 IXGB_CONTEXT_DESC_TYPE
1200 | IXGB_CONTEXT_DESC_CMD_TSE
1201 | IXGB_CONTEXT_DESC_CMD_IP
1202 | IXGB_CONTEXT_DESC_CMD_TCP
1da177e4
LT		 1203 | IXGB_CONTEXT_DESC_CMD_IDE
1204 | (skb->len - (hdr_len)));
1205
06c2f9ec 1206
1da177e4
LT		 1207 if(++i == adapter->tx_ring.count) i = 0;
1208 adapter->tx_ring.next_to_use = i;
1209
1210 return 1;
1211 }
1212#endif
1213
1214 return 0;
1215}
1216
1217static inline boolean_t
1218ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1219{
1220 struct ixgb_context_desc *context_desc;
1221 unsigned int i;
1222 uint8_t css, cso;
1223
1224 if(likely(skb->ip_summed == CHECKSUM_HW)) {
1225 css = skb->h.raw - skb->data;
1226 cso = (skb->h.raw + skb->csum) - skb->data;
1227
1228 i = adapter->tx_ring.next_to_use;
1229 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1230
1231 context_desc->tucss = css;
1232 context_desc->tucso = cso;
1233 context_desc->tucse = 0;
1234 /* zero out any previously existing data in one instruction */
1235 *(uint32_t *)&(context_desc->ipcss) = 0;
1236 context_desc->status = 0;
1237 context_desc->hdr_len = 0;
1238 context_desc->mss = 0;
1239 context_desc->cmd_type_len =
1240 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
06c2f9ec 1241 | IXGB_TX_DESC_CMD_IDE);
1da177e4
LT		 1242
1243 if(++i == adapter->tx_ring.count) i = 0;
1244 adapter->tx_ring.next_to_use = i;
1245
1246 return TRUE;
1247 }
1248
1249 return FALSE;
1250}
1251
1252#define IXGB_MAX_TXD_PWR 14
1253#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1254
1255static inline int
1256ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1257 unsigned int first)
1258{
1259 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1260 struct ixgb_buffer *buffer_info;
1261 int len = skb->len;
1262 unsigned int offset = 0, size, count = 0, i;
1263
1264 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1265 unsigned int f;
ac79c82e 1266
1da177e4
LT		 1267 len -= skb->data_len;
1268
1269 i = tx_ring->next_to_use;
1270
1271 while(len) {
1272 buffer_info = &tx_ring->buffer_info[i];
1273 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1274 buffer_info->length = size;
1275 buffer_info->dma =
1276 pci_map_single(adapter->pdev,
1277 skb->data + offset,
1278 size,
1279 PCI_DMA_TODEVICE);
1280 buffer_info->time_stamp = jiffies;
1281
1282 len -= size;
1283 offset += size;
1284 count++;
1285 if(++i == tx_ring->count) i = 0;
1286 }
1287
1288 for(f = 0; f < nr_frags; f++) {
1289 struct skb_frag_struct *frag;
1290
1291 frag = &skb_shinfo(skb)->frags[f];
1292 len = frag->size;
1293 offset = 0;
1294
1295 while(len) {
1296 buffer_info = &tx_ring->buffer_info[i];
1297 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1298 buffer_info->length = size;
1299 buffer_info->dma =
1300 pci_map_page(adapter->pdev,
1301 frag->page,
1302 frag->page_offset + offset,
1303 size,
1304 PCI_DMA_TODEVICE);
1305 buffer_info->time_stamp = jiffies;
1306
1307 len -= size;
1308 offset += size;
1309 count++;
1310 if(++i == tx_ring->count) i = 0;
1311 }
1312 }
1313 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1314 tx_ring->buffer_info[i].skb = skb;
1315 tx_ring->buffer_info[first].next_to_watch = i;
1316
1317 return count;
1318}
1319
1320static inline void
1321ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1322{
1323 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1324 struct ixgb_tx_desc *tx_desc = NULL;
1325 struct ixgb_buffer *buffer_info;
1326 uint32_t cmd_type_len = adapter->tx_cmd_type;
1327 uint8_t status = 0;
1328 uint8_t popts = 0;
1329 unsigned int i;
1330
1331 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1332 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1333 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1334 }
1335
1336 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1337 popts |= IXGB_TX_DESC_POPTS_TXSM;
1338
1339 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1340 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1341 }
1342
1343 i = tx_ring->next_to_use;
1344
1345 while(count--) {
1346 buffer_info = &tx_ring->buffer_info[i];
1347 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1348 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1349 tx_desc->cmd_type_len =
1350 cpu_to_le32(cmd_type_len | buffer_info->length);
1351 tx_desc->status = status;
1352 tx_desc->popts = popts;
1353 tx_desc->vlan = cpu_to_le16(vlan_id);
1354
1355 if(++i == tx_ring->count) i = 0;
1356 }
1357
1358 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1359 | IXGB_TX_DESC_CMD_RS );
1360
1361 /* Force memory writes to complete before letting h/w
1362 * know there are new descriptors to fetch. (Only
1363 * applicable for weak-ordered memory model archs,
1364 * such as IA-64). */
1365 wmb();
1366
1367 tx_ring->next_to_use = i;
1368 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1369}
1370
1371/* Tx Descriptors needed, worst case */
1372#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1373 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1374#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1375 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1376
1377static int
1378ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1379{
8908c6cd 1380 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1381 unsigned int first;
1382 unsigned int tx_flags = 0;
1383 unsigned long flags;
1384 int vlan_id = 0;
1385 int tso;
1386
1387 if(skb->len <= 0) {
1388 dev_kfree_skb_any(skb);
1389 return 0;
1390 }
1391
1392 spin_lock_irqsave(&adapter->tx_lock, flags);
1393 if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1394 netif_stop_queue(netdev);
1395 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1396 return 1;
1397 }
1398 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1399
1400 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1401 tx_flags |= IXGB_TX_FLAGS_VLAN;
1402 vlan_id = vlan_tx_tag_get(skb);
1403 }
1404
1405 first = adapter->tx_ring.next_to_use;
1406
1407 tso = ixgb_tso(adapter, skb);
1408 if (tso < 0) {
1409 dev_kfree_skb_any(skb);
1410 return NETDEV_TX_OK;
1411 }
1412
1413 if (tso)
1414 tx_flags |= IXGB_TX_FLAGS_TSO;
1415 else if(ixgb_tx_csum(adapter, skb))
1416 tx_flags |= IXGB_TX_FLAGS_CSUM;
1417
1418 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1419 tx_flags);
1420
1421 netdev->trans_start = jiffies;
1422
1423 return 0;
1424}
1425
1426/**
1427 * ixgb_tx_timeout - Respond to a Tx Hang
1428 * @netdev: network interface device structure
1429 **/
1430
1431static void
1432ixgb_tx_timeout(struct net_device *netdev)
1433{
8908c6cd 1434 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1435
1436 /* Do the reset outside of interrupt context */
1437 schedule_work(&adapter->tx_timeout_task);
1438}
1439
1440static void
1441ixgb_tx_timeout_task(struct net_device *netdev)
1442{
8908c6cd 1443 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1444
1445 ixgb_down(adapter, TRUE);
1446 ixgb_up(adapter);
1447}
1448
1449/**
1450 * ixgb_get_stats - Get System Network Statistics
1451 * @netdev: network interface device structure
1452 *
1453 * Returns the address of the device statistics structure.
1454 * The statistics are actually updated from the timer callback.
1455 **/
1456
1457static struct net_device_stats *
1458ixgb_get_stats(struct net_device *netdev)
1459{
8908c6cd 1460 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1461
1462 return &adapter->net_stats;
1463}
1464
1465/**
1466 * ixgb_change_mtu - Change the Maximum Transfer Unit
1467 * @netdev: network interface device structure
1468 * @new_mtu: new value for maximum frame size
1469 *
1470 * Returns 0 on success, negative on failure
1471 **/
1472
1473static int
1474ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1475{
8908c6cd 1476 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1477 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1478 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1479
1480
1481 if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1482 || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1483 IXGB_ERR("Invalid MTU setting\n");
1484 return -EINVAL;
1485 }
1486
1487 if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1488 || (max_frame <= IXGB_RXBUFFER_2048)) {
1489 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1490
1491 } else if(max_frame <= IXGB_RXBUFFER_4096) {
1492 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1493
1494 } else if(max_frame <= IXGB_RXBUFFER_8192) {
1495 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1496
1497 } else {
1498 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1499 }
1500
1501 netdev->mtu = new_mtu;
1502
1503 if(old_max_frame != max_frame && netif_running(netdev)) {
1504
1505 ixgb_down(adapter, TRUE);
1506 ixgb_up(adapter);
1507 }
1508
1509 return 0;
1510}
1511
1512/**
1513 * ixgb_update_stats - Update the board statistics counters.
1514 * @adapter: board private structure
1515 **/
1516
1517void
1518ixgb_update_stats(struct ixgb_adapter *adapter)
1519{
5633684d
MC		 1520 struct net_device *netdev = adapter->netdev;
1521
1522 if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1523 (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1524 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1525 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1526 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1527 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1528
1529 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1530 /* fix up multicast stats by removing broadcasts */
7b89178d
MC		 1531 if(multi >= bcast)
1532 multi -= bcast;
5633684d
MC		 1533
1534 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1535 adapter->stats.mprch += (multi >> 32);
1536 adapter->stats.bprcl += bcast_l;
1537 adapter->stats.bprch += bcast_h;
1538 } else {
1539 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1540 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1541 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1542 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1543 }
1da177e4
LT		 1544 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1545 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1546 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1547 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1da177e4
LT		 1548 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1549 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1550 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1551 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1552 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1553 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1554 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1555 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1556 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1557 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1558 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1559 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1560 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1561 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1562 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1563 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1564 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1565 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1566 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1567 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1568 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1569 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1570 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1571 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1572 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1573 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1574 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1575 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1576 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1577 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1578 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1579 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1580 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1581 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1582 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1583 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1584 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1585 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1586 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1587 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1588 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1589 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1590 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1591 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1592 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1593 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1594 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1595 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1596 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1597 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1598 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1599 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1600
1601 /* Fill out the OS statistics structure */
1602
1603 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1604 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1605 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1606 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1607 adapter->net_stats.multicast = adapter->stats.mprcl;
1608 adapter->net_stats.collisions = 0;
1609
1610 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1611 * with a length in the type/len field */
1612 adapter->net_stats.rx_errors =
1613 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1614 adapter->stats.ruc +
1615 adapter->stats.roc /*+ adapter->stats.rlec */ +
1616 adapter->stats.icbc +
1617 adapter->stats.ecbc + adapter->stats.mpc;
1618
1da177e4
LT		 1619 /* see above
1620 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1621 */
1622
1623 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1624 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1625 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1626 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1627
1628 adapter->net_stats.tx_errors = 0;
1629 adapter->net_stats.rx_frame_errors = 0;
1630 adapter->net_stats.tx_aborted_errors = 0;
1631 adapter->net_stats.tx_carrier_errors = 0;
1632 adapter->net_stats.tx_fifo_errors = 0;
1633 adapter->net_stats.tx_heartbeat_errors = 0;
1634 adapter->net_stats.tx_window_errors = 0;
1635}
1636
1637#define IXGB_MAX_INTR 10
1638/**
1639 * ixgb_intr - Interrupt Handler
1640 * @irq: interrupt number
1641 * @data: pointer to a network interface device structure
1642 * @pt_regs: CPU registers structure
1643 **/
1644
1645static irqreturn_t
1646ixgb_intr(int irq, void *data, struct pt_regs *regs)
1647{
1648 struct net_device *netdev = data;
8908c6cd 1649 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1650 struct ixgb_hw *hw = &adapter->hw;
1651 uint32_t icr = IXGB_READ_REG(hw, ICR);
1652#ifndef CONFIG_IXGB_NAPI
1653 unsigned int i;
1654#endif
1655
1656 if(unlikely(!icr))
1657 return IRQ_NONE; /* Not our interrupt */
1658
1659 if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1660 mod_timer(&adapter->watchdog_timer, jiffies);
1661 }
1662
1663#ifdef CONFIG_IXGB_NAPI
1664 if(netif_rx_schedule_prep(netdev)) {
1665
1666 /* Disable interrupts and register for poll. The flush
1667 of the posted write is intentionally left out.
1668 */
1669
1670 atomic_inc(&adapter->irq_sem);
1671 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1672 __netif_rx_schedule(netdev);
1673 }
1674#else
1675 /* yes, that is actually a & and it is meant to make sure that
1676 * every pass through this for loop checks both receive and
1677 * transmit queues for completed descriptors, intended to
1678 * avoid starvation issues and assist tx/rx fairness. */
1679 for(i = 0; i < IXGB_MAX_INTR; i++)
1680 if(!ixgb_clean_rx_irq(adapter) &
1681 !ixgb_clean_tx_irq(adapter))
1682 break;
1683#endif
1684 return IRQ_HANDLED;
1685}
1686
1687#ifdef CONFIG_IXGB_NAPI
1688/**
1689 * ixgb_clean - NAPI Rx polling callback
1690 * @adapter: board private structure
1691 **/
1692
1693static int
1694ixgb_clean(struct net_device *netdev, int *budget)
1695{
8908c6cd 1696 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 1697 int work_to_do = min(*budget, netdev->quota);
1698 int tx_cleaned;
1699 int work_done = 0;
1700
1701 tx_cleaned = ixgb_clean_tx_irq(adapter);
1702 ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1703
1704 *budget -= work_done;
1705 netdev->quota -= work_done;
1706
1707 /* if no Tx and not enough Rx work done, exit the polling mode */
1708 if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1709 netif_rx_complete(netdev);
1710 ixgb_irq_enable(adapter);
1711 return 0;
1712 }
1713
1714 return 1;
1715}
1716#endif
1717
1718/**
1719 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1720 * @adapter: board private structure
1721 **/
1722
1723static boolean_t
1724ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1725{
1726 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1727 struct net_device *netdev = adapter->netdev;
1728 struct ixgb_tx_desc *tx_desc, *eop_desc;
1729 struct ixgb_buffer *buffer_info;
1730 unsigned int i, eop;
1731 boolean_t cleaned = FALSE;
1732
1733 i = tx_ring->next_to_clean;
1734 eop = tx_ring->buffer_info[i].next_to_watch;
1735 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1736
1737 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1738
1739 for(cleaned = FALSE; !cleaned; ) {
1740 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1741 buffer_info = &tx_ring->buffer_info[i];
1742
1743 if (tx_desc->popts
1744 & (IXGB_TX_DESC_POPTS_TXSM |
1745 IXGB_TX_DESC_POPTS_IXSM))
1746 adapter->hw_csum_tx_good++;
1747
1748 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1749
1750 *(uint32_t *)&(tx_desc->status) = 0;
1751
1752 cleaned = (i == eop);
1753 if(++i == tx_ring->count) i = 0;
1754 }
1755
1756 eop = tx_ring->buffer_info[i].next_to_watch;
1757 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1758 }
1759
1760 tx_ring->next_to_clean = i;
1761
1762 spin_lock(&adapter->tx_lock);
1763 if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1764 (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1765
1766 netif_wake_queue(netdev);
1767 }
1768 spin_unlock(&adapter->tx_lock);
1769
1770 if(adapter->detect_tx_hung) {
1771 /* detect a transmit hang in hardware, this serializes the
1772 * check with the clearing of time_stamp and movement of i */
1773 adapter->detect_tx_hung = FALSE;
1774 if(tx_ring->buffer_info[i].dma &&
1775 time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1776 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1777 IXGB_STATUS_TXOFF))
1778 netif_stop_queue(netdev);
1779 }
1780
1781 return cleaned;
1782}
1783
1784/**
1785 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1786 * @adapter: board private structure
1787 * @rx_desc: receive descriptor
1788 * @sk_buff: socket buffer with received data
1789 **/
1790
1791static inline void
1792ixgb_rx_checksum(struct ixgb_adapter *adapter,
1793 struct ixgb_rx_desc *rx_desc,
1794 struct sk_buff *skb)
1795{
1796 /* Ignore Checksum bit is set OR
1797 * TCP Checksum has not been calculated
1798 */
1799 if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1800 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1801 skb->ip_summed = CHECKSUM_NONE;
1802 return;
1803 }
1804
1805 /* At this point we know the hardware did the TCP checksum */
1806 /* now look at the TCP checksum error bit */
1807 if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1808 /* let the stack verify checksum errors */
1809 skb->ip_summed = CHECKSUM_NONE;
1810 adapter->hw_csum_rx_error++;
1811 } else {
1812 /* TCP checksum is good */
1813 skb->ip_summed = CHECKSUM_UNNECESSARY;
1814 adapter->hw_csum_rx_good++;
1815 }
1816}
1817
1818/**
1819 * ixgb_clean_rx_irq - Send received data up the network stack,
1820 * @adapter: board private structure
1821 **/
1822
1823static boolean_t
1824#ifdef CONFIG_IXGB_NAPI
1825ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1826#else
1827ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1828#endif
1829{
1830 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1831 struct net_device *netdev = adapter->netdev;
1832 struct pci_dev *pdev = adapter->pdev;
1833 struct ixgb_rx_desc *rx_desc, *next_rxd;
1834 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1da177e4
LT		 1835 uint32_t length;
1836 unsigned int i, j;
1837 boolean_t cleaned = FALSE;
1838
1839 i = rx_ring->next_to_clean;
1840 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1841 buffer_info = &rx_ring->buffer_info[i];
1842
1843 while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
f404de1c
MC		 1844 struct sk_buff *skb, *next_skb;
1845 u8 status;
1da177e4
LT		 1846
1847#ifdef CONFIG_IXGB_NAPI
1848 if(*work_done >= work_to_do)
1849 break;
1850
1851 (*work_done)++;
1852#endif
f404de1c 1853 status = rx_desc->status;
1da177e4 1854 skb = buffer_info->skb;
f404de1c 1855
1da177e4
LT		 1856 prefetch(skb->data);
1857
1858 if(++i == rx_ring->count) i = 0;
1859 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1860 prefetch(next_rxd);
1861
1862 if((j = i + 1) == rx_ring->count) j = 0;
1863 next2_buffer = &rx_ring->buffer_info[j];
1864 prefetch(next2_buffer);
1865
1866 next_buffer = &rx_ring->buffer_info[i];
1867 next_skb = next_buffer->skb;
1868 prefetch(next_skb);
1869
1da177e4
LT		 1870 cleaned = TRUE;
1871
1872 pci_unmap_single(pdev,
1873 buffer_info->dma,
1874 buffer_info->length,
1875 PCI_DMA_FROMDEVICE);
1876
1877 length = le16_to_cpu(rx_desc->length);
1878
f404de1c 1879 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1da177e4
LT		 1880
1881 /* All receives must fit into a single buffer */
1882
1883 IXGB_DBG("Receive packet consumed multiple buffers "
1884 "length<%x>\n", length);
1885
1886 dev_kfree_skb_irq(skb);
f404de1c 1887 goto rxdesc_done;
1da177e4
LT		 1888 }
1889
1890 if (unlikely(rx_desc->errors
1891 & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1892 | IXGB_RX_DESC_ERRORS_P |
1893 IXGB_RX_DESC_ERRORS_RXE))) {
1894
1895 dev_kfree_skb_irq(skb);
f404de1c 1896 goto rxdesc_done;
1da177e4
LT		 1897 }
1898
1899 /* Good Receive */
1900 skb_put(skb, length);
1901
1902 /* Receive Checksum Offload */
1903 ixgb_rx_checksum(adapter, rx_desc, skb);
1904
1905 skb->protocol = eth_type_trans(skb, netdev);
1906#ifdef CONFIG_IXGB_NAPI
f404de1c 1907 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1da177e4
LT		 1908 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1909 le16_to_cpu(rx_desc->special) &
1910 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1911 } else {
1912 netif_receive_skb(skb);
1913 }
1914#else /* CONFIG_IXGB_NAPI */
f404de1c 1915 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1da177e4
LT		 1916 vlan_hwaccel_rx(skb, adapter->vlgrp,
1917 le16_to_cpu(rx_desc->special) &
1918 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1919 } else {
1920 netif_rx(skb);
1921 }
1922#endif /* CONFIG_IXGB_NAPI */
1923 netdev->last_rx = jiffies;
1924
f404de1c
MC		 1925rxdesc_done:
1926 /* clean up descriptor, might be written over by hw */
1da177e4
LT		 1927 rx_desc->status = 0;
1928 buffer_info->skb = NULL;
1929
f404de1c 1930 /* use prefetched values */
1da177e4
LT		 1931 rx_desc = next_rxd;
1932 buffer_info = next_buffer;
1933 }
1934
1935 rx_ring->next_to_clean = i;
1936
1937 ixgb_alloc_rx_buffers(adapter);
1938
1939 return cleaned;
1940}
1941
1942/**
1943 * ixgb_alloc_rx_buffers - Replace used receive buffers
1944 * @adapter: address of board private structure
1945 **/
1946
1947static void
1948ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1949{
1950 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1951 struct net_device *netdev = adapter->netdev;
1952 struct pci_dev *pdev = adapter->pdev;
1953 struct ixgb_rx_desc *rx_desc;
1954 struct ixgb_buffer *buffer_info;
1955 struct sk_buff *skb;
1956 unsigned int i;
1957 int num_group_tail_writes;
1958 long cleancount;
1959
1960 i = rx_ring->next_to_use;
1961 buffer_info = &rx_ring->buffer_info[i];
1962 cleancount = IXGB_DESC_UNUSED(rx_ring);
1963
1964 num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1965
41639fed
MC		 1966 /* leave three descriptors unused */
1967 while(--cleancount > 2) {
1da177e4
LT		 1968 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1969
1970 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1971
1972 if(unlikely(!skb)) {
1973 /* Better luck next round */
1974 break;
1975 }
1976
1977 /* Make buffer alignment 2 beyond a 16 byte boundary
1978 * this will result in a 16 byte aligned IP header after
1979 * the 14 byte MAC header is removed
1980 */
1981 skb_reserve(skb, NET_IP_ALIGN);
1982
1983 skb->dev = netdev;
1984
1985 buffer_info->skb = skb;
1986 buffer_info->length = adapter->rx_buffer_len;
1987 buffer_info->dma =
1988 pci_map_single(pdev,
1989 skb->data,
1990 adapter->rx_buffer_len,
1991 PCI_DMA_FROMDEVICE);
1992
1993 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
41639fed
MC		 1994 /* guarantee DD bit not set now before h/w gets descriptor
1995 * this is the rest of the workaround for h/w double
1996 * writeback. */
1997 rx_desc->status = 0;
1da177e4
LT		 1998
1999 if((i & ~(num_group_tail_writes- 1)) == i) {
2000 /* Force memory writes to complete before letting h/w
2001 * know there are new descriptors to fetch. (Only
2002 * applicable for weak-ordered memory model archs,
2003 * such as IA-64). */
2004 wmb();
2005
2006 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2007 }
2008
2009 if(++i == rx_ring->count) i = 0;
2010 buffer_info = &rx_ring->buffer_info[i];
2011 }
2012
2013 rx_ring->next_to_use = i;
2014}
2015
2016/**
2017 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2018 *
2019 * @param netdev network interface device structure
2020 * @param grp indicates to enable or disable tagging/stripping
2021 **/
2022static void
2023ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2024{
8908c6cd 2025 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 2026 uint32_t ctrl, rctl;
2027
2028 ixgb_irq_disable(adapter);
2029 adapter->vlgrp = grp;
2030
2031 if(grp) {
2032 /* enable VLAN tag insert/strip */
2033 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2034 ctrl |= IXGB_CTRL0_VME;
2035 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2036
2037 /* enable VLAN receive filtering */
2038
2039 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2040 rctl |= IXGB_RCTL_VFE;
2041 rctl &= ~IXGB_RCTL_CFIEN;
2042 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2043 } else {
2044 /* disable VLAN tag insert/strip */
2045
2046 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2047 ctrl &= ~IXGB_CTRL0_VME;
2048 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2049
2050 /* disable VLAN filtering */
2051
2052 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2053 rctl &= ~IXGB_RCTL_VFE;
2054 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2055 }
2056
2057 ixgb_irq_enable(adapter);
2058}
2059
2060static void
2061ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2062{
8908c6cd 2063 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 2064 uint32_t vfta, index;
2065
2066 /* add VID to filter table */
2067
2068 index = (vid >> 5) & 0x7F;
2069 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2070 vfta |= (1 << (vid & 0x1F));
2071 ixgb_write_vfta(&adapter->hw, index, vfta);
2072}
2073
2074static void
2075ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2076{
8908c6cd 2077 struct ixgb_adapter *adapter = netdev_priv(netdev);
1da177e4
LT		 2078 uint32_t vfta, index;
2079
2080 ixgb_irq_disable(adapter);
2081
2082 if(adapter->vlgrp)
2083 adapter->vlgrp->vlan_devices[vid] = NULL;
2084
2085 ixgb_irq_enable(adapter);
2086
2087 /* remove VID from filter table*/
2088
2089 index = (vid >> 5) & 0x7F;
2090 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2091 vfta &= ~(1 << (vid & 0x1F));
2092 ixgb_write_vfta(&adapter->hw, index, vfta);
2093}
2094
2095static void
2096ixgb_restore_vlan(struct ixgb_adapter *adapter)
2097{
2098 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2099
2100 if(adapter->vlgrp) {
2101 uint16_t vid;
2102 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2103 if(!adapter->vlgrp->vlan_devices[vid])
2104 continue;
2105 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2106 }
2107 }
2108}
2109
1da177e4
LT		 2110#ifdef CONFIG_NET_POLL_CONTROLLER
2111/*
2112 * Polling 'interrupt' - used by things like netconsole to send skbs
2113 * without having to re-enable interrupts. It's not called while
2114 * the interrupt routine is executing.
2115 */
2116
2117static void ixgb_netpoll(struct net_device *dev)
2118{
2119 struct ixgb_adapter *adapter = dev->priv;
ac79c82e 2120
1da177e4
LT		 2121 disable_irq(adapter->pdev->irq);
2122 ixgb_intr(adapter->pdev->irq, dev, NULL);
2123 enable_irq(adapter->pdev->irq);
2124}
2125#endif
2126
2127/* ixgb_main.c */
Linux 6.x block layer and io_uring tree(s)