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[PATCH] fix semaphore handling in __unregister_chrdev_region
[linux/fpc-iii.git] / drivers / net / ibmveth.c
blobc39b0609742a3394754b2cf70e2841305bc2a8c8
1 /**************************************************************************/
2 /* */
3 /* IBM eServer i/pSeries Virtual Ethernet Device Driver */
4 /* Copyright (C) 2003 IBM Corp. */
5 /* Originally written by Dave Larson (larson1@us.ibm.com) */
6 /* Maintained by Santiago Leon (santil@us.ibm.com) */
7 /* */
8 /* This program is free software; you can redistribute it and/or modify */
9 /* it under the terms of the GNU General Public License as published by */
10 /* the Free Software Foundation; either version 2 of the License, or */
11 /* (at your option) any later version. */
12 /* */
13 /* This program is distributed in the hope that it will be useful, */
14 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
15 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
16 /* GNU General Public License for more details. */
17 /* */
18 /* You should have received a copy of the GNU General Public License */
19 /* along with this program; if not, write to the Free Software */
20 /* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 */
21 /* USA */
22 /* */
23 /* This module contains the implementation of a virtual ethernet device */
24 /* for use with IBM i/pSeries LPAR Linux. It utilizes the logical LAN */
25 /* option of the RS/6000 Platform Architechture to interface with virtual */
26 /* ethernet NICs that are presented to the partition by the hypervisor. */
27 /* */
28 /**************************************************************************/
29 /*
30 TODO:
31 - remove frag processing code - no longer needed
32 - add support for sysfs
33 - possibly remove procfs support
34 */
35
36 #include <linux/config.h>
37 #include <linux/module.h>
38 #include <linux/version.h>
39 #include <linux/types.h>
40 #include <linux/errno.h>
41 #include <linux/ioport.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/kernel.h>
44 #include <linux/netdevice.h>
45 #include <linux/etherdevice.h>
46 #include <linux/skbuff.h>
47 #include <linux/init.h>
48 #include <linux/delay.h>
49 #include <linux/mm.h>
50 #include <linux/ethtool.h>
51 #include <linux/proc_fs.h>
52 #include <asm/semaphore.h>
53 #include <asm/hvcall.h>
54 #include <asm/atomic.h>
55 #include <asm/iommu.h>
56 #include <asm/vio.h>
57 #include <asm/uaccess.h>
58 #include <linux/seq_file.h>
59
60 #include "ibmveth.h"
61
62 #define DEBUG 1
63
64 #define ibmveth_printk(fmt, args...) \
65 printk(KERN_INFO "%s: " fmt, __FILE__, ## args)
66
67 #define ibmveth_error_printk(fmt, args...) \
68 printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
69
70 #ifdef DEBUG
71 #define ibmveth_debug_printk_no_adapter(fmt, args...) \
72 printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args)
73 #define ibmveth_debug_printk(fmt, args...) \
74 printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
75 #define ibmveth_assert(expr) \
76 if(!(expr)) { \
77 printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
78 BUG(); \
79 }
80 #else
81 #define ibmveth_debug_printk_no_adapter(fmt, args...)
82 #define ibmveth_debug_printk(fmt, args...)
83 #define ibmveth_assert(expr)
84 #endif
85
86 static int ibmveth_open(struct net_device *dev);
87 static int ibmveth_close(struct net_device *dev);
88 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
89 static int ibmveth_poll(struct net_device *dev, int *budget);
90 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev);
91 static struct net_device_stats *ibmveth_get_stats(struct net_device *dev);
92 static void ibmveth_set_multicast_list(struct net_device *dev);
93 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu);
94 static void ibmveth_proc_register_driver(void);
95 static void ibmveth_proc_unregister_driver(void);
96 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
97 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
98 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
99 static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter*);
100
101 #ifdef CONFIG_PROC_FS
102 #define IBMVETH_PROC_DIR "ibmveth"
103 static struct proc_dir_entry *ibmveth_proc_dir;
104 #endif
105
106 static const char ibmveth_driver_name[] = "ibmveth";
107 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
108 #define ibmveth_driver_version "1.03"
109
110 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
111 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
112 MODULE_LICENSE("GPL");
113 MODULE_VERSION(ibmveth_driver_version);
114
115 /* simple methods of getting data from the current rxq entry */
116 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
117 {
118 return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].toggle == adapter->rx_queue.toggle);
119 }
120
121 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
122 {
123 return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].valid);
124 }
125
126 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
127 {
128 return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].offset);
129 }
130
131 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
132 {
133 return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
134 }
135
136 /* setup the initial settings for a buffer pool */
137 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size)
138 {
139 pool->size = pool_size;
140 pool->index = pool_index;
141 pool->buff_size = buff_size;
142 pool->threshold = pool_size / 2;
143 }
144
145 /* allocate and setup an buffer pool - called during open */
146 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
147 {
148 int i;
149
150 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
151
152 if(!pool->free_map) {
153 return -1;
154 }
155
156 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
157 if(!pool->dma_addr) {
158 kfree(pool->free_map);
159 pool->free_map = NULL;
160 return -1;
161 }
162
163 pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL);
164
165 if(!pool->skbuff) {
166 kfree(pool->dma_addr);
167 pool->dma_addr = NULL;
168
169 kfree(pool->free_map);
170 pool->free_map = NULL;
171 return -1;
172 }
173
174 memset(pool->skbuff, 0, sizeof(void*) * pool->size);
175 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
176
177 for(i = 0; i < pool->size; ++i) {
178 pool->free_map[i] = i;
179 }
180
181 atomic_set(&pool->available, 0);
182 pool->producer_index = 0;
183 pool->consumer_index = 0;
184
185 return 0;
186 }
187
188 /* replenish the buffers for a pool. note that we don't need to
189 * skb_reserve these since they are used for incoming...
190 */
191 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
192 {
193 u32 i;
194 u32 count = pool->size - atomic_read(&pool->available);
195 u32 buffers_added = 0;
196
197 mb();
198
199 for(i = 0; i < count; ++i) {
200 struct sk_buff *skb;
201 unsigned int free_index, index;
202 u64 correlator;
203 union ibmveth_buf_desc desc;
204 unsigned long lpar_rc;
205 dma_addr_t dma_addr;
206
207 skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
208
209 if(!skb) {
210 ibmveth_debug_printk("replenish: unable to allocate skb\n");
211 adapter->replenish_no_mem++;
212 break;
213 }
214
215 free_index = pool->consumer_index++ % pool->size;
216 index = pool->free_map[free_index];
217
218 ibmveth_assert(index != IBM_VETH_INVALID_MAP);
219 ibmveth_assert(pool->skbuff[index] == NULL);
220
221 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
222 pool->buff_size, DMA_FROM_DEVICE);
223
224 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
225 pool->dma_addr[index] = dma_addr;
226 pool->skbuff[index] = skb;
227
228 correlator = ((u64)pool->index << 32) | index;
229 *(u64*)skb->data = correlator;
230
231 desc.desc = 0;
232 desc.fields.valid = 1;
233 desc.fields.length = pool->buff_size;
234 desc.fields.address = dma_addr;
235
236 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
237
238 if(lpar_rc != H_Success) {
239 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
240 pool->skbuff[index] = NULL;
241 pool->consumer_index--;
242 dma_unmap_single(&adapter->vdev->dev,
243 pool->dma_addr[index], pool->buff_size,
244 DMA_FROM_DEVICE);
245 dev_kfree_skb_any(skb);
246 adapter->replenish_add_buff_failure++;
247 break;
248 } else {
249 buffers_added++;
250 adapter->replenish_add_buff_success++;
251 }
252 }
253
254 mb();
255 atomic_add(buffers_added, &(pool->available));
256 }
257
258 /* check if replenishing is needed. */
259 static inline int ibmveth_is_replenishing_needed(struct ibmveth_adapter *adapter)
260 {
261 return ((atomic_read(&adapter->rx_buff_pool[0].available) < adapter->rx_buff_pool[0].threshold) ||
262 (atomic_read(&adapter->rx_buff_pool[1].available) < adapter->rx_buff_pool[1].threshold) ||
263 (atomic_read(&adapter->rx_buff_pool[2].available) < adapter->rx_buff_pool[2].threshold));
264 }
265
266 /* kick the replenish tasklet if we need replenishing and it isn't already running */
267 static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter *adapter)
268 {
269 if(ibmveth_is_replenishing_needed(adapter) &&
270 (atomic_dec_if_positive(&adapter->not_replenishing) == 0)) {
271 schedule_work(&adapter->replenish_task);
272 }
273 }
274
275 /* replenish tasklet routine */
276 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
277 {
278 adapter->replenish_task_cycles++;
279
280 ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[0]);
281 ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[1]);
282 ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[2]);
283
284 adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
285
286 atomic_inc(&adapter->not_replenishing);
287
288 ibmveth_schedule_replenishing(adapter);
289 }
290
291 /* empty and free ana buffer pool - also used to do cleanup in error paths */
292 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
293 {
294 int i;
295
296 if(pool->free_map) {
297 kfree(pool->free_map);
298 pool->free_map = NULL;
299 }
300
301 if(pool->skbuff && pool->dma_addr) {
302 for(i = 0; i < pool->size; ++i) {
303 struct sk_buff *skb = pool->skbuff[i];
304 if(skb) {
305 dma_unmap_single(&adapter->vdev->dev,
306 pool->dma_addr[i],
307 pool->buff_size,
308 DMA_FROM_DEVICE);
309 dev_kfree_skb_any(skb);
310 pool->skbuff[i] = NULL;
311 }
312 }
313 }
314
315 if(pool->dma_addr) {
316 kfree(pool->dma_addr);
317 pool->dma_addr = NULL;
318 }
319
320 if(pool->skbuff) {
321 kfree(pool->skbuff);
322 pool->skbuff = NULL;
323 }
324 }
325
326 /* remove a buffer from a pool */
327 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator)
328 {
329 unsigned int pool = correlator >> 32;
330 unsigned int index = correlator & 0xffffffffUL;
331 unsigned int free_index;
332 struct sk_buff *skb;
333
334 ibmveth_assert(pool < IbmVethNumBufferPools);
335 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
336
337 skb = adapter->rx_buff_pool[pool].skbuff[index];
338
339 ibmveth_assert(skb != NULL);
340
341 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
342
343 dma_unmap_single(&adapter->vdev->dev,
344 adapter->rx_buff_pool[pool].dma_addr[index],
345 adapter->rx_buff_pool[pool].buff_size,
346 DMA_FROM_DEVICE);
347
348 free_index = adapter->rx_buff_pool[pool].producer_index++ % adapter->rx_buff_pool[pool].size;
349 adapter->rx_buff_pool[pool].free_map[free_index] = index;
350
351 mb();
352
353 atomic_dec(&(adapter->rx_buff_pool[pool].available));
354 }
355
356 /* get the current buffer on the rx queue */
357 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
358 {
359 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
360 unsigned int pool = correlator >> 32;
361 unsigned int index = correlator & 0xffffffffUL;
362
363 ibmveth_assert(pool < IbmVethNumBufferPools);
364 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
365
366 return adapter->rx_buff_pool[pool].skbuff[index];
367 }
368
369 /* recycle the current buffer on the rx queue */
370 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
371 {
372 u32 q_index = adapter->rx_queue.index;
373 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
374 unsigned int pool = correlator >> 32;
375 unsigned int index = correlator & 0xffffffffUL;
376 union ibmveth_buf_desc desc;
377 unsigned long lpar_rc;
378
379 ibmveth_assert(pool < IbmVethNumBufferPools);
380 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
381
382 desc.desc = 0;
383 desc.fields.valid = 1;
384 desc.fields.length = adapter->rx_buff_pool[pool].buff_size;
385 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
386
387 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
388
389 if(lpar_rc != H_Success) {
390 ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
391 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
392 }
393
394 if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
395 adapter->rx_queue.index = 0;
396 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
397 }
398 }
399
400 static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
401 {
402 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
403
404 if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
405 adapter->rx_queue.index = 0;
406 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
407 }
408 }
409
410 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
411 {
412 if(adapter->buffer_list_addr != NULL) {
413 if(!dma_mapping_error(adapter->buffer_list_dma)) {
414 dma_unmap_single(&adapter->vdev->dev,
415 adapter->buffer_list_dma, 4096,
416 DMA_BIDIRECTIONAL);
417 adapter->buffer_list_dma = DMA_ERROR_CODE;
418 }
419 free_page((unsigned long)adapter->buffer_list_addr);
420 adapter->buffer_list_addr = NULL;
421 }
422
423 if(adapter->filter_list_addr != NULL) {
424 if(!dma_mapping_error(adapter->filter_list_dma)) {
425 dma_unmap_single(&adapter->vdev->dev,
426 adapter->filter_list_dma, 4096,
427 DMA_BIDIRECTIONAL);
428 adapter->filter_list_dma = DMA_ERROR_CODE;
429 }
430 free_page((unsigned long)adapter->filter_list_addr);
431 adapter->filter_list_addr = NULL;
432 }
433
434 if(adapter->rx_queue.queue_addr != NULL) {
435 if(!dma_mapping_error(adapter->rx_queue.queue_dma)) {
436 dma_unmap_single(&adapter->vdev->dev,
437 adapter->rx_queue.queue_dma,
438 adapter->rx_queue.queue_len,
439 DMA_BIDIRECTIONAL);
440 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
441 }
442 kfree(adapter->rx_queue.queue_addr);
443 adapter->rx_queue.queue_addr = NULL;
444 }
445
446 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[0]);
447 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[1]);
448 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[2]);
449 }
450
451 static int ibmveth_open(struct net_device *netdev)
452 {
453 struct ibmveth_adapter *adapter = netdev->priv;
454 u64 mac_address = 0;
455 int rxq_entries;
456 unsigned long lpar_rc;
457 int rc;
458 union ibmveth_buf_desc rxq_desc;
459
460 ibmveth_debug_printk("open starting\n");
461
462 rxq_entries =
463 adapter->rx_buff_pool[0].size +
464 adapter->rx_buff_pool[1].size +
465 adapter->rx_buff_pool[2].size + 1;
466
467 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
468 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
469
470 if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
471 ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
472 ibmveth_cleanup(adapter);
473 return -ENOMEM;
474 }
475
476 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
477 adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
478
479 if(!adapter->rx_queue.queue_addr) {
480 ibmveth_error_printk("unable to allocate rx queue pages\n");
481 ibmveth_cleanup(adapter);
482 return -ENOMEM;
483 }
484
485 adapter->buffer_list_dma = dma_map_single(&adapter->vdev->dev,
486 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
487 adapter->filter_list_dma = dma_map_single(&adapter->vdev->dev,
488 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
489 adapter->rx_queue.queue_dma = dma_map_single(&adapter->vdev->dev,
490 adapter->rx_queue.queue_addr,
491 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
492
493 if((dma_mapping_error(adapter->buffer_list_dma) ) ||
494 (dma_mapping_error(adapter->filter_list_dma)) ||
495 (dma_mapping_error(adapter->rx_queue.queue_dma))) {
496 ibmveth_error_printk("unable to map filter or buffer list pages\n");
497 ibmveth_cleanup(adapter);
498 return -ENOMEM;
499 }
500
501 adapter->rx_queue.index = 0;
502 adapter->rx_queue.num_slots = rxq_entries;
503 adapter->rx_queue.toggle = 1;
504
505 if(ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[0]) ||
506 ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[1]) ||
507 ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[2]))
508 {
509 ibmveth_error_printk("unable to allocate buffer pools\n");
510 ibmveth_cleanup(adapter);
511 return -ENOMEM;
512 }
513
514 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
515 mac_address = mac_address >> 16;
516
517 rxq_desc.desc = 0;
518 rxq_desc.fields.valid = 1;
519 rxq_desc.fields.length = adapter->rx_queue.queue_len;
520 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
521
522 ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr);
523 ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
524 ibmveth_debug_printk("receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
525
526
527 lpar_rc = h_register_logical_lan(adapter->vdev->unit_address,
528 adapter->buffer_list_dma,
529 rxq_desc.desc,
530 adapter->filter_list_dma,
531 mac_address);
532
533 if(lpar_rc != H_Success) {
534 ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc);
535 ibmveth_error_printk("buffer TCE:0x%x filter TCE:0x%x rxq desc:0x%lx MAC:0x%lx\n",
536 adapter->buffer_list_dma,
537 adapter->filter_list_dma,
538 rxq_desc.desc,
539 mac_address);
540 ibmveth_cleanup(adapter);
541 return -ENONET;
542 }
543
544 ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
545 if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
546 ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc);
547 do {
548 rc = h_free_logical_lan(adapter->vdev->unit_address);
549 } while (H_isLongBusy(rc) || (rc == H_Busy));
550
551 ibmveth_cleanup(adapter);
552 return rc;
553 }
554
555 netif_start_queue(netdev);
556
557 ibmveth_debug_printk("scheduling initial replenish cycle\n");
558 ibmveth_schedule_replenishing(adapter);
559
560 ibmveth_debug_printk("open complete\n");
561
562 return 0;
563 }
564
565 static int ibmveth_close(struct net_device *netdev)
566 {
567 struct ibmveth_adapter *adapter = netdev->priv;
568 long lpar_rc;
569
570 ibmveth_debug_printk("close starting\n");
571
572 netif_stop_queue(netdev);
573
574 free_irq(netdev->irq, netdev);
575
576 cancel_delayed_work(&adapter->replenish_task);
577 flush_scheduled_work();
578
579 do {
580 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
581 } while (H_isLongBusy(lpar_rc) || (lpar_rc == H_Busy));
582
583 if(lpar_rc != H_Success)
584 {
585 ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n",
586 lpar_rc);
587 }
588
589 adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
590
591 ibmveth_cleanup(adapter);
592
593 ibmveth_debug_printk("close complete\n");
594
595 return 0;
596 }
597
598 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
599 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
600 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
601 cmd->speed = SPEED_1000;
602 cmd->duplex = DUPLEX_FULL;
603 cmd->port = PORT_FIBRE;
604 cmd->phy_address = 0;
605 cmd->transceiver = XCVR_INTERNAL;
606 cmd->autoneg = AUTONEG_ENABLE;
607 cmd->maxtxpkt = 0;
608 cmd->maxrxpkt = 1;
609 return 0;
610 }
611
612 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
613 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
614 strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
615 }
616
617 static u32 netdev_get_link(struct net_device *dev) {
618 return 1;
619 }
620
621 static struct ethtool_ops netdev_ethtool_ops = {
622 .get_drvinfo = netdev_get_drvinfo,
623 .get_settings = netdev_get_settings,
624 .get_link = netdev_get_link,
625 .get_sg = ethtool_op_get_sg,
626 .get_tx_csum = ethtool_op_get_tx_csum,
627 };
628
629 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
630 {
631 return -EOPNOTSUPP;
632 }
633
634 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
635
636 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
637 {
638 struct ibmveth_adapter *adapter = netdev->priv;
639 union ibmveth_buf_desc desc[IbmVethMaxSendFrags];
640 unsigned long lpar_rc;
641 int nfrags = 0, curfrag;
642 unsigned long correlator;
643 unsigned int retry_count;
644
645 if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) {
646 adapter->stats.tx_dropped++;
647 dev_kfree_skb(skb);
648 return 0;
649 }
650
651 memset(&desc, 0, sizeof(desc));
652
653 /* nfrags = number of frags after the initial fragment */
654 nfrags = skb_shinfo(skb)->nr_frags;
655
656 if(nfrags)
657 adapter->tx_multidesc_send++;
658
659 /* map the initial fragment */
660 desc[0].fields.length = nfrags ? skb->len - skb->data_len : skb->len;
661 desc[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
662 desc[0].fields.length, DMA_TO_DEVICE);
663 desc[0].fields.valid = 1;
664
665 if(dma_mapping_error(desc[0].fields.address)) {
666 ibmveth_error_printk("tx: unable to map initial fragment\n");
667 adapter->tx_map_failed++;
668 adapter->stats.tx_dropped++;
669 dev_kfree_skb(skb);
670 return 0;
671 }
672
673 curfrag = nfrags;
674
675 /* map fragments past the initial portion if there are any */
676 while(curfrag--) {
677 skb_frag_t *frag = &skb_shinfo(skb)->frags[curfrag];
678 desc[curfrag+1].fields.address
679 = dma_map_single(&adapter->vdev->dev,
680 page_address(frag->page) + frag->page_offset,
681 frag->size, DMA_TO_DEVICE);
682 desc[curfrag+1].fields.length = frag->size;
683 desc[curfrag+1].fields.valid = 1;
684
685 if(dma_mapping_error(desc[curfrag+1].fields.address)) {
686 ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag);
687 adapter->tx_map_failed++;
688 adapter->stats.tx_dropped++;
689 /* Free all the mappings we just created */
690 while(curfrag < nfrags) {
691 dma_unmap_single(&adapter->vdev->dev,
692 desc[curfrag+1].fields.address,
693 desc[curfrag+1].fields.length,
694 DMA_TO_DEVICE);
695 curfrag++;
696 }
697 dev_kfree_skb(skb);
698 return 0;
699 }
700 }
701
702 /* send the frame. Arbitrarily set retrycount to 1024 */
703 correlator = 0;
704 retry_count = 1024;
705 do {
706 lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
707 desc[0].desc,
708 desc[1].desc,
709 desc[2].desc,
710 desc[3].desc,
711 desc[4].desc,
712 desc[5].desc,
713 correlator);
714 } while ((lpar_rc == H_Busy) && (retry_count--));
715
716 if(lpar_rc != H_Success && lpar_rc != H_Dropped) {
717 int i;
718 ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
719 for(i = 0; i < 6; i++) {
720 ibmveth_error_printk("tx: desc[%i] valid=%d, len=%d, address=0x%d\n", i,
721 desc[i].fields.valid, desc[i].fields.length, desc[i].fields.address);
722 }
723 adapter->tx_send_failed++;
724 adapter->stats.tx_dropped++;
725 } else {
726 adapter->stats.tx_packets++;
727 adapter->stats.tx_bytes += skb->len;
728 }
729
730 do {
731 dma_unmap_single(&adapter->vdev->dev,
732 desc[nfrags].fields.address,
733 desc[nfrags].fields.length, DMA_TO_DEVICE);
734 } while(--nfrags >= 0);
735
736 dev_kfree_skb(skb);
737 return 0;
738 }
739
740 static int ibmveth_poll(struct net_device *netdev, int *budget)
741 {
742 struct ibmveth_adapter *adapter = netdev->priv;
743 int max_frames_to_process = netdev->quota;
744 int frames_processed = 0;
745 int more_work = 1;
746 unsigned long lpar_rc;
747
748 restart_poll:
749 do {
750 struct net_device *netdev = adapter->netdev;
751
752 if(ibmveth_rxq_pending_buffer(adapter)) {
753 struct sk_buff *skb;
754
755 rmb();
756
757 if(!ibmveth_rxq_buffer_valid(adapter)) {
758 wmb(); /* suggested by larson1 */
759 adapter->rx_invalid_buffer++;
760 ibmveth_debug_printk("recycling invalid buffer\n");
761 ibmveth_rxq_recycle_buffer(adapter);
762 } else {
763 int length = ibmveth_rxq_frame_length(adapter);
764 int offset = ibmveth_rxq_frame_offset(adapter);
765 skb = ibmveth_rxq_get_buffer(adapter);
766
767 ibmveth_rxq_harvest_buffer(adapter);
768
769 skb_reserve(skb, offset);
770 skb_put(skb, length);
771 skb->dev = netdev;
772 skb->protocol = eth_type_trans(skb, netdev);
773
774 netif_receive_skb(skb); /* send it up */
775
776 adapter->stats.rx_packets++;
777 adapter->stats.rx_bytes += length;
778 frames_processed++;
779 }
780 } else {
781 more_work = 0;
782 }
783 } while(more_work && (frames_processed < max_frames_to_process));
784
785 ibmveth_schedule_replenishing(adapter);
786
787 if(more_work) {
788 /* more work to do - return that we are not done yet */
789 netdev->quota -= frames_processed;
790 *budget -= frames_processed;
791 return 1;
792 }
793
794 /* we think we are done - reenable interrupts, then check once more to make sure we are done */
795 lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_ENABLE);
796
797 ibmveth_assert(lpar_rc == H_Success);
798
799 netif_rx_complete(netdev);
800
801 if(ibmveth_rxq_pending_buffer(adapter) && netif_rx_reschedule(netdev, frames_processed))
802 {
803 lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
804 ibmveth_assert(lpar_rc == H_Success);
805 more_work = 1;
806 goto restart_poll;
807 }
808
809 netdev->quota -= frames_processed;
810 *budget -= frames_processed;
811
812 /* we really are done */
813 return 0;
814 }
815
816 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
817 {
818 struct net_device *netdev = dev_instance;
819 struct ibmveth_adapter *adapter = netdev->priv;
820 unsigned long lpar_rc;
821
822 if(netif_rx_schedule_prep(netdev)) {
823 lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
824 ibmveth_assert(lpar_rc == H_Success);
825 __netif_rx_schedule(netdev);
826 }
827 return IRQ_HANDLED;
828 }
829
830 static struct net_device_stats *ibmveth_get_stats(struct net_device *dev)
831 {
832 struct ibmveth_adapter *adapter = dev->priv;
833 return &adapter->stats;
834 }
835
836 static void ibmveth_set_multicast_list(struct net_device *netdev)
837 {
838 struct ibmveth_adapter *adapter = netdev->priv;
839 unsigned long lpar_rc;
840
841 if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) {
842 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
843 IbmVethMcastEnableRecv |
844 IbmVethMcastDisableFiltering,
845 0);
846 if(lpar_rc != H_Success) {
847 ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc);
848 }
849 } else {
850 struct dev_mc_list *mclist = netdev->mc_list;
851 int i;
852 /* clear the filter table & disable filtering */
853 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
854 IbmVethMcastEnableRecv |
855 IbmVethMcastDisableFiltering |
856 IbmVethMcastClearFilterTable,
857 0);
858 if(lpar_rc != H_Success) {
859 ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc);
860 }
861 /* add the addresses to the filter table */
862 for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) {
863 // add the multicast address to the filter table
864 unsigned long mcast_addr = 0;
865 memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6);
866 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
867 IbmVethMcastAddFilter,
868 mcast_addr);
869 if(lpar_rc != H_Success) {
870 ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
871 }
872 }
873
874 /* re-enable filtering */
875 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
876 IbmVethMcastEnableFiltering,
877 0);
878 if(lpar_rc != H_Success) {
879 ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc);
880 }
881 }
882 }
883
884 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
885 {
886 if ((new_mtu < 68) || (new_mtu > (1<<20)))
887 return -EINVAL;
888 dev->mtu = new_mtu;
889 return 0;
890 }
891
892 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
893 {
894 int rc;
895 struct net_device *netdev;
896 struct ibmveth_adapter *adapter;
897
898 unsigned char *mac_addr_p;
899 unsigned int *mcastFilterSize_p;
900
901
902 ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n",
903 dev->unit_address);
904
905 mac_addr_p = (unsigned char *) vio_get_attribute(dev, VETH_MAC_ADDR, 0);
906 if(!mac_addr_p) {
907 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR "
908 "attribute\n", __FILE__, __LINE__);
909 return 0;
910 }
911
912 mcastFilterSize_p= (unsigned int *) vio_get_attribute(dev, VETH_MCAST_FILTER_SIZE, 0);
913 if(!mcastFilterSize_p) {
914 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
915 "VETH_MCAST_FILTER_SIZE attribute\n",
916 __FILE__, __LINE__);
917 return 0;
918 }
919
920 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
921
922 if(!netdev)
923 return -ENOMEM;
924
925 SET_MODULE_OWNER(netdev);
926
927 adapter = netdev->priv;
928 memset(adapter, 0, sizeof(adapter));
929 dev->dev.driver_data = netdev;
930
931 adapter->vdev = dev;
932 adapter->netdev = netdev;
933 adapter->mcastFilterSize= *mcastFilterSize_p;
934
935 /* Some older boxes running PHYP non-natively have an OF that
936 returns a 8-byte local-mac-address field (and the first
937 2 bytes have to be ignored) while newer boxes' OF return
938 a 6-byte field. Note that IEEE 1275 specifies that
939 local-mac-address must be a 6-byte field.
940 The RPA doc specifies that the first byte must be 10b, so
941 we'll just look for it to solve this 8 vs. 6 byte field issue */
942
943 if ((*mac_addr_p & 0x3) != 0x02)
944 mac_addr_p += 2;
945
946 adapter->mac_addr = 0;
947 memcpy(&adapter->mac_addr, mac_addr_p, 6);
948
949 adapter->liobn = dev->iommu_table->it_index;
950
951 netdev->irq = dev->irq;
952 netdev->open = ibmveth_open;
953 netdev->poll = ibmveth_poll;
954 netdev->weight = 16;
955 netdev->stop = ibmveth_close;
956 netdev->hard_start_xmit = ibmveth_start_xmit;
957 netdev->get_stats = ibmveth_get_stats;
958 netdev->set_multicast_list = ibmveth_set_multicast_list;
959 netdev->do_ioctl = ibmveth_ioctl;
960 netdev->ethtool_ops = &netdev_ethtool_ops;
961 netdev->change_mtu = ibmveth_change_mtu;
962 SET_NETDEV_DEV(netdev, &dev->dev);
963
964 memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
965
966 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[0], 0, IbmVethPool0DftCnt, IbmVethPool0DftSize);
967 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[1], 1, IbmVethPool1DftCnt, IbmVethPool1DftSize);
968 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[2], 2, IbmVethPool2DftCnt, IbmVethPool2DftSize);
969
970 ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
971
972 INIT_WORK(&adapter->replenish_task, (void*)ibmveth_replenish_task, (void*)adapter);
973
974 adapter->buffer_list_dma = DMA_ERROR_CODE;
975 adapter->filter_list_dma = DMA_ERROR_CODE;
976 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
977
978 atomic_set(&adapter->not_replenishing, 1);
979
980 ibmveth_debug_printk("registering netdev...\n");
981
982 rc = register_netdev(netdev);
983
984 if(rc) {
985 ibmveth_debug_printk("failed to register netdev rc=%d\n", rc);
986 free_netdev(netdev);
987 return rc;
988 }
989
990 ibmveth_debug_printk("registered\n");
991
992 ibmveth_proc_register_adapter(adapter);
993
994 return 0;
995 }
996
997 static int __devexit ibmveth_remove(struct vio_dev *dev)
998 {
999 struct net_device *netdev = dev->dev.driver_data;
1000 struct ibmveth_adapter *adapter = netdev->priv;
1001
1002 unregister_netdev(netdev);
1003
1004 ibmveth_proc_unregister_adapter(adapter);
1005
1006 free_netdev(netdev);
1007 return 0;
1008 }
1009
1010 #ifdef CONFIG_PROC_FS
1011 static void ibmveth_proc_register_driver(void)
1012 {
1013 ibmveth_proc_dir = create_proc_entry(IBMVETH_PROC_DIR, S_IFDIR, proc_net);
1014 if (ibmveth_proc_dir) {
1015 SET_MODULE_OWNER(ibmveth_proc_dir);
1016 }
1017 }
1018
1019 static void ibmveth_proc_unregister_driver(void)
1020 {
1021 remove_proc_entry(IBMVETH_PROC_DIR, proc_net);
1022 }
1023
1024 static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos)
1025 {
1026 if (*pos == 0) {
1027 return (void *)1;
1028 } else {
1029 return NULL;
1030 }
1031 }
1032
1033 static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1034 {
1035 ++*pos;
1036 return NULL;
1037 }
1038
1039 static void ibmveth_seq_stop(struct seq_file *seq, void *v)
1040 {
1041 }
1042
1043 static int ibmveth_seq_show(struct seq_file *seq, void *v)
1044 {
1045 struct ibmveth_adapter *adapter = seq->private;
1046 char *current_mac = ((char*) &adapter->netdev->dev_addr);
1047 char *firmware_mac = ((char*) &adapter->mac_addr) ;
1048
1049 seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
1050
1051 seq_printf(seq, "Unit Address: 0x%x\n", adapter->vdev->unit_address);
1052 seq_printf(seq, "LIOBN: 0x%lx\n", adapter->liobn);
1053 seq_printf(seq, "Current MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
1054 current_mac[0], current_mac[1], current_mac[2],
1055 current_mac[3], current_mac[4], current_mac[5]);
1056 seq_printf(seq, "Firmware MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
1057 firmware_mac[0], firmware_mac[1], firmware_mac[2],
1058 firmware_mac[3], firmware_mac[4], firmware_mac[5]);
1059
1060 seq_printf(seq, "\nAdapter Statistics:\n");
1061 seq_printf(seq, " TX: skbuffs linearized: %ld\n", adapter->tx_linearized);
1062 seq_printf(seq, " multi-descriptor sends: %ld\n", adapter->tx_multidesc_send);
1063 seq_printf(seq, " skb_linearize failures: %ld\n", adapter->tx_linearize_failed);
1064 seq_printf(seq, " vio_map_single failres: %ld\n", adapter->tx_map_failed);
1065 seq_printf(seq, " send failures: %ld\n", adapter->tx_send_failed);
1066 seq_printf(seq, " RX: replenish task cycles: %ld\n", adapter->replenish_task_cycles);
1067 seq_printf(seq, " alloc_skb_failures: %ld\n", adapter->replenish_no_mem);
1068 seq_printf(seq, " add buffer failures: %ld\n", adapter->replenish_add_buff_failure);
1069 seq_printf(seq, " invalid buffers: %ld\n", adapter->rx_invalid_buffer);
1070 seq_printf(seq, " no buffers: %ld\n", adapter->rx_no_buffer);
1071
1072 return 0;
1073 }
1074 static struct seq_operations ibmveth_seq_ops = {
1075 .start = ibmveth_seq_start,
1076 .next = ibmveth_seq_next,
1077 .stop = ibmveth_seq_stop,
1078 .show = ibmveth_seq_show,
1079 };
1080
1081 static int ibmveth_proc_open(struct inode *inode, struct file *file)
1082 {
1083 struct seq_file *seq;
1084 struct proc_dir_entry *proc;
1085 int rc;
1086
1087 rc = seq_open(file, &ibmveth_seq_ops);
1088 if (!rc) {
1089 /* recover the pointer buried in proc_dir_entry data */
1090 seq = file->private_data;
1091 proc = PDE(inode);
1092 seq->private = proc->data;
1093 }
1094 return rc;
1095 }
1096
1097 static struct file_operations ibmveth_proc_fops = {
1098 .owner = THIS_MODULE,
1099 .open = ibmveth_proc_open,
1100 .read = seq_read,
1101 .llseek = seq_lseek,
1102 .release = seq_release,
1103 };
1104
1105 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1106 {
1107 struct proc_dir_entry *entry;
1108 if (ibmveth_proc_dir) {
1109 entry = create_proc_entry(adapter->netdev->name, S_IFREG, ibmveth_proc_dir);
1110 if (!entry) {
1111 ibmveth_error_printk("Cannot create adapter proc entry");
1112 } else {
1113 entry->data = (void *) adapter;
1114 entry->proc_fops = &ibmveth_proc_fops;
1115 SET_MODULE_OWNER(entry);
1116 }
1117 }
1118 return;
1119 }
1120
1121 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1122 {
1123 if (ibmveth_proc_dir) {
1124 remove_proc_entry(adapter->netdev->name, ibmveth_proc_dir);
1125 }
1126 }
1127
1128 #else /* CONFIG_PROC_FS */
1129 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1130 {
1131 }
1132
1133 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1134 {
1135 }
1136 static void ibmveth_proc_register_driver(void)
1137 {
1138 }
1139
1140 static void ibmveth_proc_unregister_driver(void)
1141 {
1142 }
1143 #endif /* CONFIG_PROC_FS */
1144
1145 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
1146 { "network", "IBM,l-lan"},
1147 { 0,}
1148 };
1149
1150 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1151
1152 static struct vio_driver ibmveth_driver = {
1153 .name = (char *)ibmveth_driver_name,
1154 .id_table = ibmveth_device_table,
1155 .probe = ibmveth_probe,
1156 .remove = ibmveth_remove
1157 };
1158
1159 static int __init ibmveth_module_init(void)
1160 {
1161 ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version);
1162
1163 ibmveth_proc_register_driver();
1164
1165 return vio_register_driver(&ibmveth_driver);
1166 }
1167
1168 static void __exit ibmveth_module_exit(void)
1169 {
1170 vio_unregister_driver(&ibmveth_driver);
1171 ibmveth_proc_unregister_driver();
1172 }
1173
1174 module_init(ibmveth_module_init);
1175 module_exit(ibmveth_module_exit);
Linux with added FPC-III support