Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  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   - add support for sysfs
 32   - possibly remove procfs support
 33 */
 34 
 35 #include <linux/module.h>
 36 #include <linux/types.h>
 37 #include <linux/errno.h>
 38 #include <linux/ioport.h>
 39 #include <linux/dma-mapping.h>
 40 #include <linux/kernel.h>
 41 #include <linux/netdevice.h>
 42 #include <linux/etherdevice.h>
 43 #include <linux/skbuff.h>
 44 #include <linux/init.h>
 45 #include <linux/delay.h>
 46 #include <linux/mm.h>
 47 #include <linux/ethtool.h>
 48 #include <linux/proc_fs.h>
 49 #include <linux/in.h>
 50 #include <linux/ip.h>
 51 #include <net/net_namespace.h>
 52 #include <asm/semaphore.h>
 53 #include <asm/hvcall.h>
 54 #include <asm/atomic.h>
 55 #include <asm/vio.h>
 56 #include <asm/uaccess.h>
 57 #include <linux/seq_file.h>
 58 
 59 #include "ibmveth.h"
 60 
 61 #undef DEBUG
 62 
 63 #define ibmveth_printk(fmt, args...) \
 64   printk(KERN_DEBUG "%s: " fmt, __FILE__, ## args)
 65 
 66 #define ibmveth_error_printk(fmt, args...) \
 67   printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
 68 
 69 #ifdef DEBUG
 70 #define ibmveth_debug_printk_no_adapter(fmt, args...) \
 71   printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args)
 72 #define ibmveth_debug_printk(fmt, args...) \
 73   printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
 74 #define ibmveth_assert(expr) \
 75   if(!(expr)) {                                   \
 76     printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
 77     BUG(); \
 78   }
 79 #else
 80 #define ibmveth_debug_printk_no_adapter(fmt, args...)
 81 #define ibmveth_debug_printk(fmt, args...)
 82 #define ibmveth_assert(expr)
 83 #endif
 84 
 85 static int ibmveth_open(struct net_device *dev);
 86 static int ibmveth_close(struct net_device *dev);
 87 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 88 static int ibmveth_poll(struct napi_struct *napi, int budget);
 89 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev);
 90 static void ibmveth_set_multicast_list(struct net_device *dev);
 91 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu);
 92 static void ibmveth_proc_register_driver(void);
 93 static void ibmveth_proc_unregister_driver(void);
 94 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
 95 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
 96 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
 97 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
 98 static struct kobj_type ktype_veth_pool;
 99 
100 #ifdef CONFIG_PROC_FS
101 #define IBMVETH_PROC_DIR "ibmveth"
102 static struct proc_dir_entry *ibmveth_proc_dir;
103 #endif
104 
105 static const char ibmveth_driver_name[] = "ibmveth";
106 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
107 #define ibmveth_driver_version "1.03"
108 
109 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
110 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
111 MODULE_LICENSE("GPL");
112 MODULE_VERSION(ibmveth_driver_version);
113 
114 struct ibmveth_stat {
115         char name[ETH_GSTRING_LEN];
116         int offset;
117 };
118 
119 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
120 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
121 
122 struct ibmveth_stat ibmveth_stats[] = {
123         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
124         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
125         { "replenish_add_buff_failure", IBMVETH_STAT_OFF(replenish_add_buff_failure) },
126         { "replenish_add_buff_success", IBMVETH_STAT_OFF(replenish_add_buff_success) },
127         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
128         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
129         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
130         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
131 };
132 
133 /* simple methods of getting data from the current rxq entry */
134 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
135 {
136         return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
137 }
138 
139 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
140 {
141         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >> IBMVETH_RXQ_TOGGLE_SHIFT;
142 }
143 
144 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
145 {
146         return (ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle);
147 }
148 
149 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
150 {
151         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID);
152 }
153 
154 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
155 {
156         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK);
157 }
158 
159 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
160 {
161         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
162 }
163 
164 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
165 {
166         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD);
167 }
168 
169 /* setup the initial settings for a buffer pool */
170 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
171 {
172         pool->size = pool_size;
173         pool->index = pool_index;
174         pool->buff_size = buff_size;
175         pool->threshold = pool_size / 2;
176         pool->active = pool_active;
177 }
178 
179 /* allocate and setup an buffer pool - called during open */
180 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
181 {
182         int i;
183 
184         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
185 
186         if(!pool->free_map) {
187                 return -1;
188         }
189 
190         pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
191         if(!pool->dma_addr) {
192                 kfree(pool->free_map);
193                 pool->free_map = NULL;
194                 return -1;
195         }
196 
197         pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL);
198 
199         if(!pool->skbuff) {
200                 kfree(pool->dma_addr);
201                 pool->dma_addr = NULL;
202 
203                 kfree(pool->free_map);
204                 pool->free_map = NULL;
205                 return -1;
206         }
207 
208         memset(pool->skbuff, 0, sizeof(void*) * pool->size);
209         memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
210 
211         for(i = 0; i < pool->size; ++i) {
212                 pool->free_map[i] = i;
213         }
214 
215         atomic_set(&pool->available, 0);
216         pool->producer_index = 0;
217         pool->consumer_index = 0;
218 
219         return 0;
220 }
221 
222 /* replenish the buffers for a pool.  note that we don't need to
223  * skb_reserve these since they are used for incoming...
224  */
225 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
226 {
227         u32 i;
228         u32 count = pool->size - atomic_read(&pool->available);
229         u32 buffers_added = 0;
230 
231         mb();
232 
233         for(i = 0; i < count; ++i) {
234                 struct sk_buff *skb;
235                 unsigned int free_index, index;
236                 u64 correlator;
237                 union ibmveth_buf_desc desc;
238                 unsigned long lpar_rc;
239                 dma_addr_t dma_addr;
240 
241                 skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
242 
243                 if(!skb) {
244                         ibmveth_debug_printk("replenish: unable to allocate skb\n");
245                         adapter->replenish_no_mem++;
246                         break;
247                 }
248 
249                 free_index = pool->consumer_index;
250                 pool->consumer_index = (pool->consumer_index + 1) % pool->size;
251                 index = pool->free_map[free_index];
252 
253                 ibmveth_assert(index != IBM_VETH_INVALID_MAP);
254                 ibmveth_assert(pool->skbuff[index] == NULL);
255 
256                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
257                                 pool->buff_size, DMA_FROM_DEVICE);
258 
259                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
260                 pool->dma_addr[index] = dma_addr;
261                 pool->skbuff[index] = skb;
262 
263                 correlator = ((u64)pool->index << 32) | index;
264                 *(u64*)skb->data = correlator;
265 
266                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
267                 desc.fields.address = dma_addr;
268 
269                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
270 
271                 if(lpar_rc != H_SUCCESS) {
272                         pool->free_map[free_index] = index;
273                         pool->skbuff[index] = NULL;
274                         if (pool->consumer_index == 0)
275                                 pool->consumer_index = pool->size - 1;
276                         else
277                                 pool->consumer_index--;
278                         dma_unmap_single(&adapter->vdev->dev,
279                                         pool->dma_addr[index], pool->buff_size,
280                                         DMA_FROM_DEVICE);
281                         dev_kfree_skb_any(skb);
282                         adapter->replenish_add_buff_failure++;
283                         break;
284                 } else {
285                         buffers_added++;
286                         adapter->replenish_add_buff_success++;
287                 }
288         }
289 
290         mb();
291         atomic_add(buffers_added, &(pool->available));
292 }
293 
294 /* replenish routine */
295 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
296 {
297         int i;
298 
299         adapter->replenish_task_cycles++;
300 
301         for(i = 0; i < IbmVethNumBufferPools; i++)
302                 if(adapter->rx_buff_pool[i].active)
303                         ibmveth_replenish_buffer_pool(adapter,
304                                                      &adapter->rx_buff_pool[i]);
305 
306         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
307 }
308 
309 /* empty and free ana buffer pool - also used to do cleanup in error paths */
310 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
311 {
312         int i;
313 
314         kfree(pool->free_map);
315         pool->free_map = NULL;
316 
317         if(pool->skbuff && pool->dma_addr) {
318                 for(i = 0; i < pool->size; ++i) {
319                         struct sk_buff *skb = pool->skbuff[i];
320                         if(skb) {
321                                 dma_unmap_single(&adapter->vdev->dev,
322                                                  pool->dma_addr[i],
323                                                  pool->buff_size,
324                                                  DMA_FROM_DEVICE);
325                                 dev_kfree_skb_any(skb);
326                                 pool->skbuff[i] = NULL;
327                         }
328                 }
329         }
330 
331         if(pool->dma_addr) {
332                 kfree(pool->dma_addr);
333                 pool->dma_addr = NULL;
334         }
335 
336         if(pool->skbuff) {
337                 kfree(pool->skbuff);
338                 pool->skbuff = NULL;
339         }
340 }
341 
342 /* remove a buffer from a pool */
343 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator)
344 {
345         unsigned int pool  = correlator >> 32;
346         unsigned int index = correlator & 0xffffffffUL;
347         unsigned int free_index;
348         struct sk_buff *skb;
349 
350         ibmveth_assert(pool < IbmVethNumBufferPools);
351         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
352 
353         skb = adapter->rx_buff_pool[pool].skbuff[index];
354 
355         ibmveth_assert(skb != NULL);
356 
357         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
358 
359         dma_unmap_single(&adapter->vdev->dev,
360                          adapter->rx_buff_pool[pool].dma_addr[index],
361                          adapter->rx_buff_pool[pool].buff_size,
362                          DMA_FROM_DEVICE);
363 
364         free_index = adapter->rx_buff_pool[pool].producer_index;
365         adapter->rx_buff_pool[pool].producer_index
366                 = (adapter->rx_buff_pool[pool].producer_index + 1)
367                 % adapter->rx_buff_pool[pool].size;
368         adapter->rx_buff_pool[pool].free_map[free_index] = index;
369 
370         mb();
371 
372         atomic_dec(&(adapter->rx_buff_pool[pool].available));
373 }
374 
375 /* get the current buffer on the rx queue */
376 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
377 {
378         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
379         unsigned int pool = correlator >> 32;
380         unsigned int index = correlator & 0xffffffffUL;
381 
382         ibmveth_assert(pool < IbmVethNumBufferPools);
383         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
384 
385         return adapter->rx_buff_pool[pool].skbuff[index];
386 }
387 
388 /* recycle the current buffer on the rx queue */
389 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
390 {
391         u32 q_index = adapter->rx_queue.index;
392         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
393         unsigned int pool = correlator >> 32;
394         unsigned int index = correlator & 0xffffffffUL;
395         union ibmveth_buf_desc desc;
396         unsigned long lpar_rc;
397 
398         ibmveth_assert(pool < IbmVethNumBufferPools);
399         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
400 
401         if(!adapter->rx_buff_pool[pool].active) {
402                 ibmveth_rxq_harvest_buffer(adapter);
403                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
404                 return;
405         }
406 
407         desc.fields.flags_len = IBMVETH_BUF_VALID |
408                 adapter->rx_buff_pool[pool].buff_size;
409         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
410 
411         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
412 
413         if(lpar_rc != H_SUCCESS) {
414                 ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
415                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
416         }
417 
418         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
419                 adapter->rx_queue.index = 0;
420                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
421         }
422 }
423 
424 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
425 {
426         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
427 
428         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
429                 adapter->rx_queue.index = 0;
430                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
431         }
432 }
433 
434 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
435 {
436         int i;
437 
438         if(adapter->buffer_list_addr != NULL) {
439                 if(!dma_mapping_error(adapter->buffer_list_dma)) {
440                         dma_unmap_single(&adapter->vdev->dev,
441                                         adapter->buffer_list_dma, 4096,
442                                         DMA_BIDIRECTIONAL);
443                         adapter->buffer_list_dma = DMA_ERROR_CODE;
444                 }
445                 free_page((unsigned long)adapter->buffer_list_addr);
446                 adapter->buffer_list_addr = NULL;
447         }
448 
449         if(adapter->filter_list_addr != NULL) {
450                 if(!dma_mapping_error(adapter->filter_list_dma)) {
451                         dma_unmap_single(&adapter->vdev->dev,
452                                         adapter->filter_list_dma, 4096,
453                                         DMA_BIDIRECTIONAL);
454                         adapter->filter_list_dma = DMA_ERROR_CODE;
455                 }
456                 free_page((unsigned long)adapter->filter_list_addr);
457                 adapter->filter_list_addr = NULL;
458         }
459 
460         if(adapter->rx_queue.queue_addr != NULL) {
461                 if(!dma_mapping_error(adapter->rx_queue.queue_dma)) {
462                         dma_unmap_single(&adapter->vdev->dev,
463                                         adapter->rx_queue.queue_dma,
464                                         adapter->rx_queue.queue_len,
465                                         DMA_BIDIRECTIONAL);
466                         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
467                 }
468                 kfree(adapter->rx_queue.queue_addr);
469                 adapter->rx_queue.queue_addr = NULL;
470         }
471 
472         for(i = 0; i<IbmVethNumBufferPools; i++)
473                 if (adapter->rx_buff_pool[i].active)
474                         ibmveth_free_buffer_pool(adapter,
475                                                  &adapter->rx_buff_pool[i]);
476 }
477 
478 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
479         union ibmveth_buf_desc rxq_desc, u64 mac_address)
480 {
481         int rc, try_again = 1;
482 
483         /* After a kexec the adapter will still be open, so our attempt to
484         * open it will fail. So if we get a failure we free the adapter and
485         * try again, but only once. */
486 retry:
487         rc = h_register_logical_lan(adapter->vdev->unit_address,
488                                     adapter->buffer_list_dma, rxq_desc.desc,
489                                     adapter->filter_list_dma, mac_address);
490 
491         if (rc != H_SUCCESS && try_again) {
492                 do {
493                         rc = h_free_logical_lan(adapter->vdev->unit_address);
494                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
495 
496                 try_again = 0;
497                 goto retry;
498         }
499 
500         return rc;
501 }
502 
503 static int ibmveth_open(struct net_device *netdev)
504 {
505         struct ibmveth_adapter *adapter = netdev->priv;
506         u64 mac_address = 0;
507         int rxq_entries = 1;
508         unsigned long lpar_rc;
509         int rc;
510         union ibmveth_buf_desc rxq_desc;
511         int i;
512 
513         ibmveth_debug_printk("open starting\n");
514 
515         napi_enable(&adapter->napi);
516 
517         for(i = 0; i<IbmVethNumBufferPools; i++)
518                 rxq_entries += adapter->rx_buff_pool[i].size;
519 
520         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
521         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
522 
523         if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
524                 ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
525                 ibmveth_cleanup(adapter);
526                 napi_disable(&adapter->napi);
527                 return -ENOMEM;
528         }
529 
530         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
531         adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
532 
533         if(!adapter->rx_queue.queue_addr) {
534                 ibmveth_error_printk("unable to allocate rx queue pages\n");
535                 ibmveth_cleanup(adapter);
536                 napi_disable(&adapter->napi);
537                 return -ENOMEM;
538         }
539 
540         adapter->buffer_list_dma = dma_map_single(&adapter->vdev->dev,
541                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
542         adapter->filter_list_dma = dma_map_single(&adapter->vdev->dev,
543                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
544         adapter->rx_queue.queue_dma = dma_map_single(&adapter->vdev->dev,
545                         adapter->rx_queue.queue_addr,
546                         adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
547 
548         if((dma_mapping_error(adapter->buffer_list_dma) ) ||
549            (dma_mapping_error(adapter->filter_list_dma)) ||
550            (dma_mapping_error(adapter->rx_queue.queue_dma))) {
551                 ibmveth_error_printk("unable to map filter or buffer list pages\n");
552                 ibmveth_cleanup(adapter);
553                 napi_disable(&adapter->napi);
554                 return -ENOMEM;
555         }
556 
557         adapter->rx_queue.index = 0;
558         adapter->rx_queue.num_slots = rxq_entries;
559         adapter->rx_queue.toggle = 1;
560 
561         memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
562         mac_address = mac_address >> 16;
563 
564         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | adapter->rx_queue.queue_len;
565         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
566 
567         ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr);
568         ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
569         ibmveth_debug_printk("receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
570 
571         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
572 
573         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
574 
575         if(lpar_rc != H_SUCCESS) {
576                 ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc);
577                 ibmveth_error_printk("buffer TCE:0x%lx filter TCE:0x%lx rxq desc:0x%lx MAC:0x%lx\n",
578                                      adapter->buffer_list_dma,
579                                      adapter->filter_list_dma,
580                                      rxq_desc.desc,
581                                      mac_address);
582                 ibmveth_cleanup(adapter);
583                 napi_disable(&adapter->napi);
584                 return -ENONET;
585         }
586 
587         for(i = 0; i<IbmVethNumBufferPools; i++) {
588                 if(!adapter->rx_buff_pool[i].active)
589                         continue;
590                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
591                         ibmveth_error_printk("unable to alloc pool\n");
592                         adapter->rx_buff_pool[i].active = 0;
593                         ibmveth_cleanup(adapter);
594                         napi_disable(&adapter->napi);
595                         return -ENOMEM ;
596                 }
597         }
598 
599         ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
600         if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
601                 ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc);
602                 do {
603                         rc = h_free_logical_lan(adapter->vdev->unit_address);
604                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
605 
606                 ibmveth_cleanup(adapter);
607                 napi_disable(&adapter->napi);
608                 return rc;
609         }
610 
611         ibmveth_debug_printk("initial replenish cycle\n");
612         ibmveth_interrupt(netdev->irq, netdev);
613 
614         netif_start_queue(netdev);
615 
616         ibmveth_debug_printk("open complete\n");
617 
618         return 0;
619 }
620 
621 static int ibmveth_close(struct net_device *netdev)
622 {
623         struct ibmveth_adapter *adapter = netdev->priv;
624         long lpar_rc;
625 
626         ibmveth_debug_printk("close starting\n");
627 
628         napi_disable(&adapter->napi);
629 
630         if (!adapter->pool_config)
631                 netif_stop_queue(netdev);
632 
633         free_irq(netdev->irq, netdev);
634 
635         do {
636                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
637         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
638 
639         if(lpar_rc != H_SUCCESS)
640         {
641                 ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n",
642                                      lpar_rc);
643         }
644 
645         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
646 
647         ibmveth_cleanup(adapter);
648 
649         ibmveth_debug_printk("close complete\n");
650 
651         return 0;
652 }
653 
654 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
655         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
656         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
657         cmd->speed = SPEED_1000;
658         cmd->duplex = DUPLEX_FULL;
659         cmd->port = PORT_FIBRE;
660         cmd->phy_address = 0;
661         cmd->transceiver = XCVR_INTERNAL;
662         cmd->autoneg = AUTONEG_ENABLE;
663         cmd->maxtxpkt = 0;
664         cmd->maxrxpkt = 1;
665         return 0;
666 }
667 
668 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
669         strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
670         strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
671 }
672 
673 static u32 netdev_get_link(struct net_device *dev) {
674         return 1;
675 }
676 
677 static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
678 {
679         struct ibmveth_adapter *adapter = dev->priv;
680 
681         if (data)
682                 adapter->rx_csum = 1;
683         else {
684                 /*
685                  * Since the ibmveth firmware interface does not have the concept of
686                  * separate tx/rx checksum offload enable, if rx checksum is disabled
687                  * we also have to disable tx checksum offload. Once we disable rx
688                  * checksum offload, we are no longer allowed to send tx buffers that
689                  * are not properly checksummed.
690                  */
691                 adapter->rx_csum = 0;
692                 dev->features &= ~NETIF_F_IP_CSUM;
693         }
694 }
695 
696 static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
697 {
698         struct ibmveth_adapter *adapter = dev->priv;
699 
700         if (data) {
701                 dev->features |= NETIF_F_IP_CSUM;
702                 adapter->rx_csum = 1;
703         } else
704                 dev->features &= ~NETIF_F_IP_CSUM;
705 }
706 
707 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
708                                     void (*done) (struct net_device *, u32))
709 {
710         struct ibmveth_adapter *adapter = dev->priv;
711         u64 set_attr, clr_attr, ret_attr;
712         long ret;
713         int rc1 = 0, rc2 = 0;
714         int restart = 0;
715 
716         if (netif_running(dev)) {
717                 restart = 1;
718                 adapter->pool_config = 1;
719                 ibmveth_close(dev);
720                 adapter->pool_config = 0;
721         }
722 
723         set_attr = 0;
724         clr_attr = 0;
725 
726         if (data)
727                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
728         else
729                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
730 
731         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
732 
733         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
734             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
735             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
736                 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
737                                          set_attr, &ret_attr);
738 
739                 if (ret != H_SUCCESS) {
740                         rc1 = -EIO;
741                         ibmveth_error_printk("unable to change checksum offload settings."
742                                              " %d rc=%ld\n", data, ret);
743 
744                         ret = h_illan_attributes(adapter->vdev->unit_address,
745                                                  set_attr, clr_attr, &ret_attr);
746                 } else
747                         done(dev, data);
748         } else {
749                 rc1 = -EIO;
750                 ibmveth_error_printk("unable to change checksum offload settings."
751                                      " %d rc=%ld ret_attr=%lx\n", data, ret, ret_attr);
752         }
753 
754         if (restart)
755                 rc2 = ibmveth_open(dev);
756 
757         return rc1 ? rc1 : rc2;
758 }
759 
760 static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
761 {
762         struct ibmveth_adapter *adapter = dev->priv;
763 
764         if ((data && adapter->rx_csum) || (!data && !adapter->rx_csum))
765                 return 0;
766 
767         return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
768 }
769 
770 static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
771 {
772         struct ibmveth_adapter *adapter = dev->priv;
773         int rc = 0;
774 
775         if (data && (dev->features & NETIF_F_IP_CSUM))
776                 return 0;
777         if (!data && !(dev->features & NETIF_F_IP_CSUM))
778                 return 0;
779 
780         if (data && !adapter->rx_csum)
781                 rc = ibmveth_set_csum_offload(dev, data, ibmveth_set_tx_csum_flags);
782         else
783                 ibmveth_set_tx_csum_flags(dev, data);
784 
785         return rc;
786 }
787 
788 static u32 ibmveth_get_rx_csum(struct net_device *dev)
789 {
790         struct ibmveth_adapter *adapter = dev->priv;
791         return adapter->rx_csum;
792 }
793 
794 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
795 {
796         int i;
797 
798         if (stringset != ETH_SS_STATS)
799                 return;
800 
801         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
802                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
803 }
804 
805 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
806 {
807         switch (sset) {
808         case ETH_SS_STATS:
809                 return ARRAY_SIZE(ibmveth_stats);
810         default:
811                 return -EOPNOTSUPP;
812         }
813 }
814 
815 static void ibmveth_get_ethtool_stats(struct net_device *dev,
816                                       struct ethtool_stats *stats, u64 *data)
817 {
818         int i;
819         struct ibmveth_adapter *adapter = dev->priv;
820 
821         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
822                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
823 }
824 
825 static const struct ethtool_ops netdev_ethtool_ops = {
826         .get_drvinfo            = netdev_get_drvinfo,
827         .get_settings           = netdev_get_settings,
828         .get_link               = netdev_get_link,
829         .set_tx_csum            = ibmveth_set_tx_csum,
830         .get_rx_csum            = ibmveth_get_rx_csum,
831         .set_rx_csum            = ibmveth_set_rx_csum,
832         .get_strings            = ibmveth_get_strings,
833         .get_sset_count         = ibmveth_get_sset_count,
834         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
835 };
836 
837 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
838 {
839         return -EOPNOTSUPP;
840 }
841 
842 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
843 
844 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
845 {
846         struct ibmveth_adapter *adapter = netdev->priv;
847         union ibmveth_buf_desc desc;
848         unsigned long lpar_rc;
849         unsigned long correlator;
850         unsigned long flags;
851         unsigned int retry_count;
852         unsigned int tx_dropped = 0;
853         unsigned int tx_bytes = 0;
854         unsigned int tx_packets = 0;
855         unsigned int tx_send_failed = 0;
856         unsigned int tx_map_failed = 0;
857 
858         desc.fields.flags_len = IBMVETH_BUF_VALID | skb->len;
859         desc.fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
860                                              skb->len, DMA_TO_DEVICE);
861 
862         if (skb->ip_summed == CHECKSUM_PARTIAL &&
863             ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
864                 ibmveth_error_printk("tx: failed to checksum packet\n");
865                 tx_dropped++;
866                 goto out;
867         }
868 
869         if (skb->ip_summed == CHECKSUM_PARTIAL) {
870                 unsigned char *buf = skb_transport_header(skb) + skb->csum_offset;
871 
872                 desc.fields.flags_len |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
873 
874                 /* Need to zero out the checksum */
875                 buf[0] = 0;
876                 buf[1] = 0;
877         }
878 
879         if (dma_mapping_error(desc.fields.address)) {
880                 ibmveth_error_printk("tx: unable to map xmit buffer\n");
881                 tx_map_failed++;
882                 tx_dropped++;
883                 goto out;
884         }
885 
886         /* send the frame. Arbitrarily set retrycount to 1024 */
887         correlator = 0;
888         retry_count = 1024;
889         do {
890                 lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
891                                              desc.desc, 0, 0, 0, 0, 0,
892                                              correlator, &correlator);
893         } while ((lpar_rc == H_BUSY) && (retry_count--));
894 
895         if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
896                 ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
897                 ibmveth_error_printk("tx: valid=%d, len=%d, address=0x%08x\n",
898                                      (desc.fields.flags_len & IBMVETH_BUF_VALID) ? 1 : 0,
899                                      skb->len, desc.fields.address);
900                 tx_send_failed++;
901                 tx_dropped++;
902         } else {
903                 tx_packets++;
904                 tx_bytes += skb->len;
905                 netdev->trans_start = jiffies;
906         }
907 
908         dma_unmap_single(&adapter->vdev->dev, desc.fields.address,
909                          skb->len, DMA_TO_DEVICE);
910 
911 out:    spin_lock_irqsave(&adapter->stats_lock, flags);
912         netdev->stats.tx_dropped += tx_dropped;
913         netdev->stats.tx_bytes += tx_bytes;
914         netdev->stats.tx_packets += tx_packets;
915         adapter->tx_send_failed += tx_send_failed;
916         adapter->tx_map_failed += tx_map_failed;
917         spin_unlock_irqrestore(&adapter->stats_lock, flags);
918 
919         dev_kfree_skb(skb);
920         return 0;
921 }
922 
923 static int ibmveth_poll(struct napi_struct *napi, int budget)
924 {
925         struct ibmveth_adapter *adapter = container_of(napi, struct ibmveth_adapter, napi);
926         struct net_device *netdev = adapter->netdev;
927         int frames_processed = 0;
928         unsigned long lpar_rc;
929 
930  restart_poll:
931         do {
932                 struct sk_buff *skb;
933 
934                 if (!ibmveth_rxq_pending_buffer(adapter))
935                         break;
936 
937                 rmb();
938                 if (!ibmveth_rxq_buffer_valid(adapter)) {
939                         wmb(); /* suggested by larson1 */
940                         adapter->rx_invalid_buffer++;
941                         ibmveth_debug_printk("recycling invalid buffer\n");
942                         ibmveth_rxq_recycle_buffer(adapter);
943                 } else {
944                         int length = ibmveth_rxq_frame_length(adapter);
945                         int offset = ibmveth_rxq_frame_offset(adapter);
946                         int csum_good = ibmveth_rxq_csum_good(adapter);
947 
948                         skb = ibmveth_rxq_get_buffer(adapter);
949                         if (csum_good)
950                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
951 
952                         ibmveth_rxq_harvest_buffer(adapter);
953 
954                         skb_reserve(skb, offset);
955                         skb_put(skb, length);
956                         skb->protocol = eth_type_trans(skb, netdev);
957 
958                         netif_receive_skb(skb); /* send it up */
959 
960                         netdev->stats.rx_packets++;
961                         netdev->stats.rx_bytes += length;
962                         frames_processed++;
963                         netdev->last_rx = jiffies;
964                 }
965         } while (frames_processed < budget);
966 
967         ibmveth_replenish_task(adapter);
968 
969         if (frames_processed < budget) {
970                 /* We think we are done - reenable interrupts,
971                  * then check once more to make sure we are done.
972                  */
973                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
974                                        VIO_IRQ_ENABLE);
975 
976                 ibmveth_assert(lpar_rc == H_SUCCESS);
977 
978                 netif_rx_complete(netdev, napi);
979 
980                 if (ibmveth_rxq_pending_buffer(adapter) &&
981                     netif_rx_reschedule(netdev, napi)) {
982                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
983                                                VIO_IRQ_DISABLE);
984                         goto restart_poll;
985                 }
986         }
987 
988         return frames_processed;
989 }
990 
991 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
992 {
993         struct net_device *netdev = dev_instance;
994         struct ibmveth_adapter *adapter = netdev->priv;
995         unsigned long lpar_rc;
996 
997         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
998                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
999                                        VIO_IRQ_DISABLE);
1000                 ibmveth_assert(lpar_rc == H_SUCCESS);
1001                 __netif_rx_schedule(netdev, &adapter->napi);
1002         }
1003         return IRQ_HANDLED;
1004 }
1005 
1006 static void ibmveth_set_multicast_list(struct net_device *netdev)
1007 {
1008         struct ibmveth_adapter *adapter = netdev->priv;
1009         unsigned long lpar_rc;
1010 
1011         if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) {
1012                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1013                                            IbmVethMcastEnableRecv |
1014                                            IbmVethMcastDisableFiltering,
1015                                            0);
1016                 if(lpar_rc != H_SUCCESS) {
1017                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc);
1018                 }
1019         } else {
1020                 struct dev_mc_list *mclist = netdev->mc_list;
1021                 int i;
1022                 /* clear the filter table & disable filtering */
1023                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1024                                            IbmVethMcastEnableRecv |
1025                                            IbmVethMcastDisableFiltering |
1026                                            IbmVethMcastClearFilterTable,
1027                                            0);
1028                 if(lpar_rc != H_SUCCESS) {
1029                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc);
1030                 }
1031                 /* add the addresses to the filter table */
1032                 for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) {
1033                         // add the multicast address to the filter table
1034                         unsigned long mcast_addr = 0;
1035                         memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6);
1036                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1037                                                    IbmVethMcastAddFilter,
1038                                                    mcast_addr);
1039                         if(lpar_rc != H_SUCCESS) {
1040                                 ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
1041                         }
1042                 }
1043 
1044                 /* re-enable filtering */
1045                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1046                                            IbmVethMcastEnableFiltering,
1047                                            0);
1048                 if(lpar_rc != H_SUCCESS) {
1049                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc);
1050                 }
1051         }
1052 }
1053 
1054 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1055 {
1056         struct ibmveth_adapter *adapter = dev->priv;
1057         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1058         int reinit = 0;
1059         int i, rc;
1060 
1061         if (new_mtu < IBMVETH_MAX_MTU)
1062                 return -EINVAL;
1063 
1064         for (i = 0; i < IbmVethNumBufferPools; i++)
1065                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1066                         break;
1067 
1068         if (i == IbmVethNumBufferPools)
1069                 return -EINVAL;
1070 
1071         /* Look for an active buffer pool that can hold the new MTU */
1072         for(i = 0; i<IbmVethNumBufferPools; i++) {
1073                 if (!adapter->rx_buff_pool[i].active) {
1074                         adapter->rx_buff_pool[i].active = 1;
1075                         reinit = 1;
1076                 }
1077 
1078                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1079                         if (reinit && netif_running(adapter->netdev)) {
1080                                 adapter->pool_config = 1;
1081                                 ibmveth_close(adapter->netdev);
1082                                 adapter->pool_config = 0;
1083                                 dev->mtu = new_mtu;
1084                                 if ((rc = ibmveth_open(adapter->netdev)))
1085                                         return rc;
1086                         } else
1087                                 dev->mtu = new_mtu;
1088                         return 0;
1089                 }
1090         }
1091         return -EINVAL;
1092 }
1093 
1094 #ifdef CONFIG_NET_POLL_CONTROLLER
1095 static void ibmveth_poll_controller(struct net_device *dev)
1096 {
1097         ibmveth_replenish_task(dev->priv);
1098         ibmveth_interrupt(dev->irq, dev);
1099 }
1100 #endif
1101 
1102 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1103 {
1104         int rc, i;
1105         long ret;
1106         struct net_device *netdev;
1107         struct ibmveth_adapter *adapter;
1108         u64 set_attr, ret_attr;
1109 
1110         unsigned char *mac_addr_p;
1111         unsigned int *mcastFilterSize_p;
1112 
1113 
1114         ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n",
1115                                         dev->unit_address);
1116 
1117         mac_addr_p = (unsigned char *) vio_get_attribute(dev,
1118                                                 VETH_MAC_ADDR, NULL);
1119         if(!mac_addr_p) {
1120                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR "
1121                                 "attribute\n", __FILE__, __LINE__);
1122                 return 0;
1123         }
1124 
1125         mcastFilterSize_p = (unsigned int *) vio_get_attribute(dev,
1126                                                 VETH_MCAST_FILTER_SIZE, NULL);
1127         if(!mcastFilterSize_p) {
1128                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
1129                                 "VETH_MCAST_FILTER_SIZE attribute\n",
1130                                 __FILE__, __LINE__);
1131                 return 0;
1132         }
1133 
1134         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1135 
1136         if(!netdev)
1137                 return -ENOMEM;
1138 
1139         adapter = netdev->priv;
1140         dev->dev.driver_data = netdev;
1141 
1142         adapter->vdev = dev;
1143         adapter->netdev = netdev;
1144         adapter->mcastFilterSize= *mcastFilterSize_p;
1145         adapter->pool_config = 0;
1146 
1147         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1148 
1149         /*      Some older boxes running PHYP non-natively have an OF that
1150                 returns a 8-byte local-mac-address field (and the first
1151                 2 bytes have to be ignored) while newer boxes' OF return
1152                 a 6-byte field. Note that IEEE 1275 specifies that
1153                 local-mac-address must be a 6-byte field.
1154                 The RPA doc specifies that the first byte must be 10b, so
1155                 we'll just look for it to solve this 8 vs. 6 byte field issue */
1156 
1157         if ((*mac_addr_p & 0x3) != 0x02)
1158                 mac_addr_p += 2;
1159 
1160         adapter->mac_addr = 0;
1161         memcpy(&adapter->mac_addr, mac_addr_p, 6);
1162 
1163         netdev->irq = dev->irq;
1164         netdev->open               = ibmveth_open;
1165         netdev->stop               = ibmveth_close;
1166         netdev->hard_start_xmit    = ibmveth_start_xmit;
1167         netdev->set_multicast_list = ibmveth_set_multicast_list;
1168         netdev->do_ioctl           = ibmveth_ioctl;
1169         netdev->ethtool_ops           = &netdev_ethtool_ops;
1170         netdev->change_mtu         = ibmveth_change_mtu;
1171         SET_NETDEV_DEV(netdev, &dev->dev);
1172 #ifdef CONFIG_NET_POLL_CONTROLLER
1173         netdev->poll_controller = ibmveth_poll_controller;
1174 #endif
1175         netdev->features |= NETIF_F_LLTX;
1176         spin_lock_init(&adapter->stats_lock);
1177 
1178         memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1179 
1180         for(i = 0; i<IbmVethNumBufferPools; i++) {
1181                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1182                 int error;
1183 
1184                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1185                                          pool_count[i], pool_size[i],
1186                                          pool_active[i]);
1187                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1188                                              &dev->dev.kobj, "pool%d", i);
1189                 if (!error)
1190                         kobject_uevent(kobj, KOBJ_ADD);
1191         }
1192 
1193         ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
1194 
1195         adapter->buffer_list_dma = DMA_ERROR_CODE;
1196         adapter->filter_list_dma = DMA_ERROR_CODE;
1197         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1198 
1199         ibmveth_debug_printk("registering netdev...\n");
1200 
1201         ret = h_illan_attributes(dev->unit_address, 0, 0, &ret_attr);
1202 
1203         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
1204             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
1205             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
1206                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
1207 
1208                 ret = h_illan_attributes(dev->unit_address, 0, set_attr, &ret_attr);
1209 
1210                 if (ret == H_SUCCESS) {
1211                         adapter->rx_csum = 1;
1212                         netdev->features |= NETIF_F_IP_CSUM;
1213                 } else
1214                         ret = h_illan_attributes(dev->unit_address, set_attr, 0, &ret_attr);
1215         }
1216 
1217         rc = register_netdev(netdev);
1218 
1219         if(rc) {
1220                 ibmveth_debug_printk("failed to register netdev rc=%d\n", rc);
1221                 free_netdev(netdev);
1222                 return rc;
1223         }
1224 
1225         ibmveth_debug_printk("registered\n");
1226 
1227         ibmveth_proc_register_adapter(adapter);
1228 
1229         return 0;
1230 }
1231 
1232 static int __devexit ibmveth_remove(struct vio_dev *dev)
1233 {
1234         struct net_device *netdev = dev->dev.driver_data;
1235         struct ibmveth_adapter *adapter = netdev->priv;
1236         int i;
1237 
1238         for(i = 0; i<IbmVethNumBufferPools; i++)
1239                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1240 
1241         unregister_netdev(netdev);
1242 
1243         ibmveth_proc_unregister_adapter(adapter);
1244 
1245         free_netdev(netdev);
1246         return 0;
1247 }
1248 
1249 #ifdef CONFIG_PROC_FS
1250 static void ibmveth_proc_register_driver(void)
1251 {
1252         ibmveth_proc_dir = proc_mkdir(IBMVETH_PROC_DIR, init_net.proc_net);
1253         if (ibmveth_proc_dir) {
1254         }
1255 }
1256 
1257 static void ibmveth_proc_unregister_driver(void)
1258 {
1259         remove_proc_entry(IBMVETH_PROC_DIR, init_net.proc_net);
1260 }
1261 
1262 static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos)
1263 {
1264         if (*pos == 0) {
1265                 return (void *)1;
1266         } else {
1267                 return NULL;
1268         }
1269 }
1270 
1271 static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1272 {
1273         ++*pos;
1274         return NULL;
1275 }
1276 
1277 static void ibmveth_seq_stop(struct seq_file *seq, void *v)
1278 {
1279 }
1280 
1281 static int ibmveth_seq_show(struct seq_file *seq, void *v)
1282 {
1283         struct ibmveth_adapter *adapter = seq->private;
1284         char *current_mac = ((char*) &adapter->netdev->dev_addr);
1285         char *firmware_mac = ((char*) &adapter->mac_addr) ;
1286         DECLARE_MAC_BUF(mac);
1287 
1288         seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
1289 
1290         seq_printf(seq, "Unit Address:    0x%x\n", adapter->vdev->unit_address);
1291         seq_printf(seq, "Current MAC:     %s\n", print_mac(mac, current_mac));
1292         seq_printf(seq, "Firmware MAC:    %s\n", print_mac(mac, firmware_mac));
1293 
1294         seq_printf(seq, "\nAdapter Statistics:\n");
1295         seq_printf(seq, "  TX:  vio_map_single failres:      %ld\n", adapter->tx_map_failed);
1296         seq_printf(seq, "       send failures:               %ld\n", adapter->tx_send_failed);
1297         seq_printf(seq, "  RX:  replenish task cycles:       %ld\n", adapter->replenish_task_cycles);
1298         seq_printf(seq, "       alloc_skb_failures:          %ld\n", adapter->replenish_no_mem);
1299         seq_printf(seq, "       add buffer failures:         %ld\n", adapter->replenish_add_buff_failure);
1300         seq_printf(seq, "       invalid buffers:             %ld\n", adapter->rx_invalid_buffer);
1301         seq_printf(seq, "       no buffers:                  %ld\n", adapter->rx_no_buffer);
1302 
1303         return 0;
1304 }
1305 static struct seq_operations ibmveth_seq_ops = {
1306         .start = ibmveth_seq_start,
1307         .next  = ibmveth_seq_next,
1308         .stop  = ibmveth_seq_stop,
1309         .show  = ibmveth_seq_show,
1310 };
1311 
1312 static int ibmveth_proc_open(struct inode *inode, struct file *file)
1313 {
1314         struct seq_file *seq;
1315         struct proc_dir_entry *proc;
1316         int rc;
1317 
1318         rc = seq_open(file, &ibmveth_seq_ops);
1319         if (!rc) {
1320                 /* recover the pointer buried in proc_dir_entry data */
1321                 seq = file->private_data;
1322                 proc = PDE(inode);
1323                 seq->private = proc->data;
1324         }
1325         return rc;
1326 }
1327 
1328 static const struct file_operations ibmveth_proc_fops = {
1329         .owner   = THIS_MODULE,
1330         .open    = ibmveth_proc_open,
1331         .read    = seq_read,
1332         .llseek  = seq_lseek,
1333         .release = seq_release,
1334 };
1335 
1336 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1337 {
1338         struct proc_dir_entry *entry;
1339         if (ibmveth_proc_dir) {
1340                 char u_addr[10];
1341                 sprintf(u_addr, "%x", adapter->vdev->unit_address);
1342                 entry = create_proc_entry(u_addr, S_IFREG, ibmveth_proc_dir);
1343                 if (!entry) {
1344                         ibmveth_error_printk("Cannot create adapter proc entry");
1345                 } else {
1346                         entry->data = (void *) adapter;
1347                         entry->proc_fops = &ibmveth_proc_fops;
1348                 }
1349         }
1350         return;
1351 }
1352 
1353 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1354 {
1355         if (ibmveth_proc_dir) {
1356                 char u_addr[10];
1357                 sprintf(u_addr, "%x", adapter->vdev->unit_address);
1358                 remove_proc_entry(u_addr, ibmveth_proc_dir);
1359         }
1360 }
1361 
1362 #else /* CONFIG_PROC_FS */
1363 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1364 {
1365 }
1366 
1367 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1368 {
1369 }
1370 static void ibmveth_proc_register_driver(void)
1371 {
1372 }
1373 
1374 static void ibmveth_proc_unregister_driver(void)
1375 {
1376 }
1377 #endif /* CONFIG_PROC_FS */
1378 
1379 static struct attribute veth_active_attr;
1380 static struct attribute veth_num_attr;
1381 static struct attribute veth_size_attr;
1382 
1383 static ssize_t veth_pool_show(struct kobject * kobj,
1384                               struct attribute * attr, char * buf)
1385 {
1386         struct ibmveth_buff_pool *pool = container_of(kobj,
1387                                                       struct ibmveth_buff_pool,
1388                                                       kobj);
1389 
1390         if (attr == &veth_active_attr)
1391                 return sprintf(buf, "%d\n", pool->active);
1392         else if (attr == &veth_num_attr)
1393                 return sprintf(buf, "%d\n", pool->size);
1394         else if (attr == &veth_size_attr)
1395                 return sprintf(buf, "%d\n", pool->buff_size);
1396         return 0;
1397 }
1398 
1399 static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
1400 const char * buf, size_t count)
1401 {
1402         struct ibmveth_buff_pool *pool = container_of(kobj,
1403                                                       struct ibmveth_buff_pool,
1404                                                       kobj);
1405         struct net_device *netdev =
1406             container_of(kobj->parent, struct device, kobj)->driver_data;
1407         struct ibmveth_adapter *adapter = netdev->priv;
1408         long value = simple_strtol(buf, NULL, 10);
1409         long rc;
1410 
1411         if (attr == &veth_active_attr) {
1412                 if (value && !pool->active) {
1413                         if (netif_running(netdev)) {
1414                                 if(ibmveth_alloc_buffer_pool(pool)) {
1415                                         ibmveth_error_printk("unable to alloc pool\n");
1416                                         return -ENOMEM;
1417                                 }
1418                                 pool->active = 1;
1419                                 adapter->pool_config = 1;
1420                                 ibmveth_close(netdev);
1421                                 adapter->pool_config = 0;
1422                                 if ((rc = ibmveth_open(netdev)))
1423                                         return rc;
1424                         } else
1425                                 pool->active = 1;
1426                 } else if (!value && pool->active) {
1427                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1428                         int i;
1429                         /* Make sure there is a buffer pool with buffers that
1430                            can hold a packet of the size of the MTU */
1431                         for (i = 0; i < IbmVethNumBufferPools; i++) {
1432                                 if (pool == &adapter->rx_buff_pool[i])
1433                                         continue;
1434                                 if (!adapter->rx_buff_pool[i].active)
1435                                         continue;
1436                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1437                                         break;
1438                         }
1439 
1440                         if (i == IbmVethNumBufferPools) {
1441                                 ibmveth_error_printk("no active pool >= MTU\n");
1442                                 return -EPERM;
1443                         }
1444 
1445                         pool->active = 0;
1446                         if (netif_running(netdev)) {
1447                                 adapter->pool_config = 1;
1448                                 ibmveth_close(netdev);
1449                                 adapter->pool_config = 0;
1450                                 if ((rc = ibmveth_open(netdev)))
1451                                         return rc;
1452                         }
1453                 }
1454         } else if (attr == &veth_num_attr) {
1455                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
1456                         return -EINVAL;
1457                 else {
1458                         if (netif_running(netdev)) {
1459                                 adapter->pool_config = 1;
1460                                 ibmveth_close(netdev);
1461                                 adapter->pool_config = 0;
1462                                 pool->size = value;
1463                                 if ((rc = ibmveth_open(netdev)))
1464                                         return rc;
1465                         } else
1466                                 pool->size = value;
1467                 }
1468         } else if (attr == &veth_size_attr) {
1469                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
1470                         return -EINVAL;
1471                 else {
1472                         if (netif_running(netdev)) {
1473                                 adapter->pool_config = 1;
1474                                 ibmveth_close(netdev);
1475                                 adapter->pool_config = 0;
1476                                 pool->buff_size = value;
1477                                 if ((rc = ibmveth_open(netdev)))
1478                                         return rc;
1479                         } else
1480                                 pool->buff_size = value;
1481                 }
1482         }
1483 
1484         /* kick the interrupt handler to allocate/deallocate pools */
1485         ibmveth_interrupt(netdev->irq, netdev);
1486         return count;
1487 }
1488 
1489 
1490 #define ATTR(_name, _mode)      \
1491         struct attribute veth_##_name##_attr = {               \
1492         .name = __stringify(_name), .mode = _mode, \
1493         };
1494 
1495 static ATTR(active, 0644);
1496 static ATTR(num, 0644);
1497 static ATTR(size, 0644);
1498 
1499 static struct attribute * veth_pool_attrs[] = {
1500         &veth_active_attr,
1501         &veth_num_attr,
1502         &veth_size_attr,
1503         NULL,
1504 };
1505 
1506 static struct sysfs_ops veth_pool_ops = {
1507         .show   = veth_pool_show,
1508         .store  = veth_pool_store,
1509 };
1510 
1511 static struct kobj_type ktype_veth_pool = {
1512         .release        = NULL,
1513         .sysfs_ops      = &veth_pool_ops,
1514         .default_attrs  = veth_pool_attrs,
1515 };
1516 
1517 
1518 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
1519         { "network", "IBM,l-lan"},
1520         { "", "" }
1521 };
1522 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1523 
1524 static struct vio_driver ibmveth_driver = {
1525         .id_table       = ibmveth_device_table,
1526         .probe          = ibmveth_probe,
1527         .remove         = ibmveth_remove,
1528         .driver         = {
1529                 .name   = ibmveth_driver_name,
1530                 .owner  = THIS_MODULE,
1531         }
1532 };
1533 
1534 static int __init ibmveth_module_init(void)
1535 {
1536         ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version);
1537 
1538         ibmveth_proc_register_driver();
1539 
1540         return vio_register_driver(&ibmveth_driver);
1541 }
1542 
1543 static void __exit ibmveth_module_exit(void)
1544 {
1545         vio_unregister_driver(&ibmveth_driver);
1546         ibmveth_proc_unregister_driver();
1547 }
1548 
1549 module_init(ibmveth_module_init);
1550 module_exit(ibmveth_module_exit);
1551 
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