Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/net/ethernet/ibm/ibmveth.c

  1 /*
  2  * IBM Power Virtual Ethernet Device Driver
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16  *
 17  * Copyright (C) IBM Corporation, 2003, 2010
 18  *
 19  * Authors: Dave Larson <larson1@us.ibm.com>
 20  *          Santiago Leon <santil@linux.vnet.ibm.com>
 21  *          Brian King <brking@linux.vnet.ibm.com>
 22  *          Robert Jennings <rcj@linux.vnet.ibm.com>
 23  *          Anton Blanchard <anton@au.ibm.com>
 24  */
 25 
 26 #include <linux/module.h>
 27 #include <linux/moduleparam.h>
 28 #include <linux/types.h>
 29 #include <linux/errno.h>
 30 #include <linux/dma-mapping.h>
 31 #include <linux/kernel.h>
 32 #include <linux/netdevice.h>
 33 #include <linux/etherdevice.h>
 34 #include <linux/skbuff.h>
 35 #include <linux/init.h>
 36 #include <linux/interrupt.h>
 37 #include <linux/mm.h>
 38 #include <linux/pm.h>
 39 #include <linux/ethtool.h>
 40 #include <linux/in.h>
 41 #include <linux/ip.h>
 42 #include <linux/ipv6.h>
 43 #include <linux/slab.h>
 44 #include <asm/hvcall.h>
 45 #include <linux/atomic.h>
 46 #include <asm/vio.h>
 47 #include <asm/iommu.h>
 48 #include <asm/firmware.h>
 49 
 50 #include "ibmveth.h"
 51 
 52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
 53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
 54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
 55 
 56 static struct kobj_type ktype_veth_pool;
 57 
 58 
 59 static const char ibmveth_driver_name[] = "ibmveth";
 60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
 61 #define ibmveth_driver_version "1.04"
 62 
 63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
 64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
 65 MODULE_LICENSE("GPL");
 66 MODULE_VERSION(ibmveth_driver_version);
 67 
 68 static unsigned int tx_copybreak __read_mostly = 128;
 69 module_param(tx_copybreak, uint, 0644);
 70 MODULE_PARM_DESC(tx_copybreak,
 71         "Maximum size of packet that is copied to a new buffer on transmit");
 72 
 73 static unsigned int rx_copybreak __read_mostly = 128;
 74 module_param(rx_copybreak, uint, 0644);
 75 MODULE_PARM_DESC(rx_copybreak,
 76         "Maximum size of packet that is copied to a new buffer on receive");
 77 
 78 static unsigned int rx_flush __read_mostly = 0;
 79 module_param(rx_flush, uint, 0644);
 80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
 81 
 82 struct ibmveth_stat {
 83         char name[ETH_GSTRING_LEN];
 84         int offset;
 85 };
 86 
 87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
 88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
 89 
 90 struct ibmveth_stat ibmveth_stats[] = {
 91         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
 92         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
 93         { "replenish_add_buff_failure",
 94                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
 95         { "replenish_add_buff_success",
 96                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
 97         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
 98         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
 99         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
100         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
101         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
102         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
103 };
104 
105 /* simple methods of getting data from the current rxq entry */
106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
107 {
108         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
109 }
110 
111 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
112 {
113         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
114                         IBMVETH_RXQ_TOGGLE_SHIFT;
115 }
116 
117 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
118 {
119         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
120 }
121 
122 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
123 {
124         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
125 }
126 
127 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
128 {
129         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
130 }
131 
132 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
133 {
134         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
135 }
136 
137 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
138 {
139         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
140 }
141 
142 /* setup the initial settings for a buffer pool */
143 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
144                                      u32 pool_index, u32 pool_size,
145                                      u32 buff_size, u32 pool_active)
146 {
147         pool->size = pool_size;
148         pool->index = pool_index;
149         pool->buff_size = buff_size;
150         pool->threshold = pool_size * 7 / 8;
151         pool->active = pool_active;
152 }
153 
154 /* allocate and setup an buffer pool - called during open */
155 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
156 {
157         int i;
158 
159         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
160 
161         if (!pool->free_map)
162                 return -1;
163 
164         pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
165         if (!pool->dma_addr) {
166                 kfree(pool->free_map);
167                 pool->free_map = NULL;
168                 return -1;
169         }
170 
171         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
172 
173         if (!pool->skbuff) {
174                 kfree(pool->dma_addr);
175                 pool->dma_addr = NULL;
176 
177                 kfree(pool->free_map);
178                 pool->free_map = NULL;
179                 return -1;
180         }
181 
182         memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
183 
184         for (i = 0; i < pool->size; ++i)
185                 pool->free_map[i] = i;
186 
187         atomic_set(&pool->available, 0);
188         pool->producer_index = 0;
189         pool->consumer_index = 0;
190 
191         return 0;
192 }
193 
194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195 {
196         unsigned long offset;
197 
198         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199                 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200 }
201 
202 /* replenish the buffers for a pool.  note that we don't need to
203  * skb_reserve these since they are used for incoming...
204  */
205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206                                           struct ibmveth_buff_pool *pool)
207 {
208         u32 i;
209         u32 count = pool->size - atomic_read(&pool->available);
210         u32 buffers_added = 0;
211         struct sk_buff *skb;
212         unsigned int free_index, index;
213         u64 correlator;
214         unsigned long lpar_rc;
215         dma_addr_t dma_addr;
216 
217         mb();
218 
219         for (i = 0; i < count; ++i) {
220                 union ibmveth_buf_desc desc;
221 
222                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223 
224                 if (!skb) {
225                         netdev_dbg(adapter->netdev,
226                                    "replenish: unable to allocate skb\n");
227                         adapter->replenish_no_mem++;
228                         break;
229                 }
230 
231                 free_index = pool->consumer_index;
232                 pool->consumer_index++;
233                 if (pool->consumer_index >= pool->size)
234                         pool->consumer_index = 0;
235                 index = pool->free_map[free_index];
236 
237                 BUG_ON(index == IBM_VETH_INVALID_MAP);
238                 BUG_ON(pool->skbuff[index] != NULL);
239 
240                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241                                 pool->buff_size, DMA_FROM_DEVICE);
242 
243                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244                         goto failure;
245 
246                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247                 pool->dma_addr[index] = dma_addr;
248                 pool->skbuff[index] = skb;
249 
250                 correlator = ((u64)pool->index << 32) | index;
251                 *(u64 *)skb->data = correlator;
252 
253                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254                 desc.fields.address = dma_addr;
255 
256                 if (rx_flush) {
257                         unsigned int len = min(pool->buff_size,
258                                                 adapter->netdev->mtu +
259                                                 IBMVETH_BUFF_OH);
260                         ibmveth_flush_buffer(skb->data, len);
261                 }
262                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263                                                    desc.desc);
264 
265                 if (lpar_rc != H_SUCCESS) {
266                         goto failure;
267                 } else {
268                         buffers_added++;
269                         adapter->replenish_add_buff_success++;
270                 }
271         }
272 
273         mb();
274         atomic_add(buffers_added, &(pool->available));
275         return;
276 
277 failure:
278         pool->free_map[free_index] = index;
279         pool->skbuff[index] = NULL;
280         if (pool->consumer_index == 0)
281                 pool->consumer_index = pool->size - 1;
282         else
283                 pool->consumer_index--;
284         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285                 dma_unmap_single(&adapter->vdev->dev,
286                                  pool->dma_addr[index], pool->buff_size,
287                                  DMA_FROM_DEVICE);
288         dev_kfree_skb_any(skb);
289         adapter->replenish_add_buff_failure++;
290 
291         mb();
292         atomic_add(buffers_added, &(pool->available));
293 }
294 
295 /* replenish routine */
296 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
297 {
298         int i;
299 
300         adapter->replenish_task_cycles++;
301 
302         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
303                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
304 
305                 if (pool->active &&
306                     (atomic_read(&pool->available) < pool->threshold))
307                         ibmveth_replenish_buffer_pool(adapter, pool);
308         }
309 
310         adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
311                                                 4096 - 8);
312 }
313 
314 /* empty and free ana buffer pool - also used to do cleanup in error paths */
315 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
316                                      struct ibmveth_buff_pool *pool)
317 {
318         int i;
319 
320         kfree(pool->free_map);
321         pool->free_map = NULL;
322 
323         if (pool->skbuff && pool->dma_addr) {
324                 for (i = 0; i < pool->size; ++i) {
325                         struct sk_buff *skb = pool->skbuff[i];
326                         if (skb) {
327                                 dma_unmap_single(&adapter->vdev->dev,
328                                                  pool->dma_addr[i],
329                                                  pool->buff_size,
330                                                  DMA_FROM_DEVICE);
331                                 dev_kfree_skb_any(skb);
332                                 pool->skbuff[i] = NULL;
333                         }
334                 }
335         }
336 
337         if (pool->dma_addr) {
338                 kfree(pool->dma_addr);
339                 pool->dma_addr = NULL;
340         }
341 
342         if (pool->skbuff) {
343                 kfree(pool->skbuff);
344                 pool->skbuff = NULL;
345         }
346 }
347 
348 /* remove a buffer from a pool */
349 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
350                                             u64 correlator)
351 {
352         unsigned int pool  = correlator >> 32;
353         unsigned int index = correlator & 0xffffffffUL;
354         unsigned int free_index;
355         struct sk_buff *skb;
356 
357         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
358         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
359 
360         skb = adapter->rx_buff_pool[pool].skbuff[index];
361 
362         BUG_ON(skb == NULL);
363 
364         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
365 
366         dma_unmap_single(&adapter->vdev->dev,
367                          adapter->rx_buff_pool[pool].dma_addr[index],
368                          adapter->rx_buff_pool[pool].buff_size,
369                          DMA_FROM_DEVICE);
370 
371         free_index = adapter->rx_buff_pool[pool].producer_index;
372         adapter->rx_buff_pool[pool].producer_index++;
373         if (adapter->rx_buff_pool[pool].producer_index >=
374             adapter->rx_buff_pool[pool].size)
375                 adapter->rx_buff_pool[pool].producer_index = 0;
376         adapter->rx_buff_pool[pool].free_map[free_index] = index;
377 
378         mb();
379 
380         atomic_dec(&(adapter->rx_buff_pool[pool].available));
381 }
382 
383 /* get the current buffer on the rx queue */
384 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
385 {
386         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
387         unsigned int pool = correlator >> 32;
388         unsigned int index = correlator & 0xffffffffUL;
389 
390         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
391         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
392 
393         return adapter->rx_buff_pool[pool].skbuff[index];
394 }
395 
396 /* recycle the current buffer on the rx queue */
397 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
398 {
399         u32 q_index = adapter->rx_queue.index;
400         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
401         unsigned int pool = correlator >> 32;
402         unsigned int index = correlator & 0xffffffffUL;
403         union ibmveth_buf_desc desc;
404         unsigned long lpar_rc;
405         int ret = 1;
406 
407         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
408         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
409 
410         if (!adapter->rx_buff_pool[pool].active) {
411                 ibmveth_rxq_harvest_buffer(adapter);
412                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
413                 goto out;
414         }
415 
416         desc.fields.flags_len = IBMVETH_BUF_VALID |
417                 adapter->rx_buff_pool[pool].buff_size;
418         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
419 
420         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
421 
422         if (lpar_rc != H_SUCCESS) {
423                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
424                            "during recycle rc=%ld", lpar_rc);
425                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
426                 ret = 0;
427         }
428 
429         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
430                 adapter->rx_queue.index = 0;
431                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
432         }
433 
434 out:
435         return ret;
436 }
437 
438 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
439 {
440         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
441 
442         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
443                 adapter->rx_queue.index = 0;
444                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
445         }
446 }
447 
448 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
449 {
450         int i;
451         struct device *dev = &adapter->vdev->dev;
452 
453         if (adapter->buffer_list_addr != NULL) {
454                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
455                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
456                                         DMA_BIDIRECTIONAL);
457                         adapter->buffer_list_dma = DMA_ERROR_CODE;
458                 }
459                 free_page((unsigned long)adapter->buffer_list_addr);
460                 adapter->buffer_list_addr = NULL;
461         }
462 
463         if (adapter->filter_list_addr != NULL) {
464                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
465                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
466                                         DMA_BIDIRECTIONAL);
467                         adapter->filter_list_dma = DMA_ERROR_CODE;
468                 }
469                 free_page((unsigned long)adapter->filter_list_addr);
470                 adapter->filter_list_addr = NULL;
471         }
472 
473         if (adapter->rx_queue.queue_addr != NULL) {
474                 dma_free_coherent(dev, adapter->rx_queue.queue_len,
475                                   adapter->rx_queue.queue_addr,
476                                   adapter->rx_queue.queue_dma);
477                 adapter->rx_queue.queue_addr = NULL;
478         }
479 
480         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
481                 if (adapter->rx_buff_pool[i].active)
482                         ibmveth_free_buffer_pool(adapter,
483                                                  &adapter->rx_buff_pool[i]);
484 
485         if (adapter->bounce_buffer != NULL) {
486                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
487                         dma_unmap_single(&adapter->vdev->dev,
488                                         adapter->bounce_buffer_dma,
489                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
490                                         DMA_BIDIRECTIONAL);
491                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
492                 }
493                 kfree(adapter->bounce_buffer);
494                 adapter->bounce_buffer = NULL;
495         }
496 }
497 
498 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
499         union ibmveth_buf_desc rxq_desc, u64 mac_address)
500 {
501         int rc, try_again = 1;
502 
503         /*
504          * After a kexec the adapter will still be open, so our attempt to
505          * open it will fail. So if we get a failure we free the adapter and
506          * try again, but only once.
507          */
508 retry:
509         rc = h_register_logical_lan(adapter->vdev->unit_address,
510                                     adapter->buffer_list_dma, rxq_desc.desc,
511                                     adapter->filter_list_dma, mac_address);
512 
513         if (rc != H_SUCCESS && try_again) {
514                 do {
515                         rc = h_free_logical_lan(adapter->vdev->unit_address);
516                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
517 
518                 try_again = 0;
519                 goto retry;
520         }
521 
522         return rc;
523 }
524 
525 static u64 ibmveth_encode_mac_addr(u8 *mac)
526 {
527         int i;
528         u64 encoded = 0;
529 
530         for (i = 0; i < ETH_ALEN; i++)
531                 encoded = (encoded << 8) | mac[i];
532 
533         return encoded;
534 }
535 
536 static int ibmveth_open(struct net_device *netdev)
537 {
538         struct ibmveth_adapter *adapter = netdev_priv(netdev);
539         u64 mac_address;
540         int rxq_entries = 1;
541         unsigned long lpar_rc;
542         int rc;
543         union ibmveth_buf_desc rxq_desc;
544         int i;
545         struct device *dev;
546 
547         netdev_dbg(netdev, "open starting\n");
548 
549         napi_enable(&adapter->napi);
550 
551         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
552                 rxq_entries += adapter->rx_buff_pool[i].size;
553 
554         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
555         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
556 
557         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
558                 netdev_err(netdev, "unable to allocate filter or buffer list "
559                            "pages\n");
560                 rc = -ENOMEM;
561                 goto err_out;
562         }
563 
564         dev = &adapter->vdev->dev;
565 
566         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
567                                                 rxq_entries;
568         adapter->rx_queue.queue_addr =
569                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
570                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
571         if (!adapter->rx_queue.queue_addr) {
572                 rc = -ENOMEM;
573                 goto err_out;
574         }
575 
576         adapter->buffer_list_dma = dma_map_single(dev,
577                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
578         adapter->filter_list_dma = dma_map_single(dev,
579                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
580 
581         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
582             (dma_mapping_error(dev, adapter->filter_list_dma))) {
583                 netdev_err(netdev, "unable to map filter or buffer list "
584                            "pages\n");
585                 rc = -ENOMEM;
586                 goto err_out;
587         }
588 
589         adapter->rx_queue.index = 0;
590         adapter->rx_queue.num_slots = rxq_entries;
591         adapter->rx_queue.toggle = 1;
592 
593         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
594 
595         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
596                                         adapter->rx_queue.queue_len;
597         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
598 
599         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
600         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
601         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
602 
603         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
604 
605         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
606 
607         if (lpar_rc != H_SUCCESS) {
608                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
609                            lpar_rc);
610                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
611                            "desc:0x%llx MAC:0x%llx\n",
612                                      adapter->buffer_list_dma,
613                                      adapter->filter_list_dma,
614                                      rxq_desc.desc,
615                                      mac_address);
616                 rc = -ENONET;
617                 goto err_out;
618         }
619 
620         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
621                 if (!adapter->rx_buff_pool[i].active)
622                         continue;
623                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
624                         netdev_err(netdev, "unable to alloc pool\n");
625                         adapter->rx_buff_pool[i].active = 0;
626                         rc = -ENOMEM;
627                         goto err_out;
628                 }
629         }
630 
631         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
632         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
633                          netdev);
634         if (rc != 0) {
635                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
636                            netdev->irq, rc);
637                 do {
638                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
639                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
640 
641                 goto err_out;
642         }
643 
644         adapter->bounce_buffer =
645             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
646         if (!adapter->bounce_buffer) {
647                 rc = -ENOMEM;
648                 goto err_out_free_irq;
649         }
650         adapter->bounce_buffer_dma =
651             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
652                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
653         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
654                 netdev_err(netdev, "unable to map bounce buffer\n");
655                 rc = -ENOMEM;
656                 goto err_out_free_irq;
657         }
658 
659         netdev_dbg(netdev, "initial replenish cycle\n");
660         ibmveth_interrupt(netdev->irq, netdev);
661 
662         netif_start_queue(netdev);
663 
664         netdev_dbg(netdev, "open complete\n");
665 
666         return 0;
667 
668 err_out_free_irq:
669         free_irq(netdev->irq, netdev);
670 err_out:
671         ibmveth_cleanup(adapter);
672         napi_disable(&adapter->napi);
673         return rc;
674 }
675 
676 static int ibmveth_close(struct net_device *netdev)
677 {
678         struct ibmveth_adapter *adapter = netdev_priv(netdev);
679         long lpar_rc;
680 
681         netdev_dbg(netdev, "close starting\n");
682 
683         napi_disable(&adapter->napi);
684 
685         if (!adapter->pool_config)
686                 netif_stop_queue(netdev);
687 
688         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
689 
690         do {
691                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
692         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
693 
694         if (lpar_rc != H_SUCCESS) {
695                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
696                            "continuing with close\n", lpar_rc);
697         }
698 
699         free_irq(netdev->irq, netdev);
700 
701         adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
702                                                 4096 - 8);
703 
704         ibmveth_cleanup(adapter);
705 
706         netdev_dbg(netdev, "close complete\n");
707 
708         return 0;
709 }
710 
711 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
712 {
713         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
714                                 SUPPORTED_FIBRE);
715         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
716                                 ADVERTISED_FIBRE);
717         ethtool_cmd_speed_set(cmd, SPEED_1000);
718         cmd->duplex = DUPLEX_FULL;
719         cmd->port = PORT_FIBRE;
720         cmd->phy_address = 0;
721         cmd->transceiver = XCVR_INTERNAL;
722         cmd->autoneg = AUTONEG_ENABLE;
723         cmd->maxtxpkt = 0;
724         cmd->maxrxpkt = 1;
725         return 0;
726 }
727 
728 static void netdev_get_drvinfo(struct net_device *dev,
729                                struct ethtool_drvinfo *info)
730 {
731         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
732         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
733 }
734 
735 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
736         netdev_features_t features)
737 {
738         /*
739          * Since the ibmveth firmware interface does not have the
740          * concept of separate tx/rx checksum offload enable, if rx
741          * checksum is disabled we also have to disable tx checksum
742          * offload. Once we disable rx checksum offload, we are no
743          * longer allowed to send tx buffers that are not properly
744          * checksummed.
745          */
746 
747         if (!(features & NETIF_F_RXCSUM))
748                 features &= ~NETIF_F_ALL_CSUM;
749 
750         return features;
751 }
752 
753 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
754 {
755         struct ibmveth_adapter *adapter = netdev_priv(dev);
756         unsigned long set_attr, clr_attr, ret_attr;
757         unsigned long set_attr6, clr_attr6;
758         long ret, ret4, ret6;
759         int rc1 = 0, rc2 = 0;
760         int restart = 0;
761 
762         if (netif_running(dev)) {
763                 restart = 1;
764                 adapter->pool_config = 1;
765                 ibmveth_close(dev);
766                 adapter->pool_config = 0;
767         }
768 
769         set_attr = 0;
770         clr_attr = 0;
771         set_attr6 = 0;
772         clr_attr6 = 0;
773 
774         if (data) {
775                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
776                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
777         } else {
778                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
779                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
780         }
781 
782         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
783 
784         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
785             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
786             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
787                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
788                                          set_attr, &ret_attr);
789 
790                 if (ret4 != H_SUCCESS) {
791                         netdev_err(dev, "unable to change IPv4 checksum "
792                                         "offload settings. %d rc=%ld\n",
793                                         data, ret4);
794 
795                         h_illan_attributes(adapter->vdev->unit_address,
796                                            set_attr, clr_attr, &ret_attr);
797 
798                         if (data == 1)
799                                 dev->features &= ~NETIF_F_IP_CSUM;
800 
801                 } else {
802                         adapter->fw_ipv4_csum_support = data;
803                 }
804 
805                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
806                                          clr_attr6, set_attr6, &ret_attr);
807 
808                 if (ret6 != H_SUCCESS) {
809                         netdev_err(dev, "unable to change IPv6 checksum "
810                                         "offload settings. %d rc=%ld\n",
811                                         data, ret6);
812 
813                         h_illan_attributes(adapter->vdev->unit_address,
814                                            set_attr6, clr_attr6, &ret_attr);
815 
816                         if (data == 1)
817                                 dev->features &= ~NETIF_F_IPV6_CSUM;
818 
819                 } else
820                         adapter->fw_ipv6_csum_support = data;
821 
822                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
823                         adapter->rx_csum = data;
824                 else
825                         rc1 = -EIO;
826         } else {
827                 rc1 = -EIO;
828                 netdev_err(dev, "unable to change checksum offload settings."
829                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
830                                      ret_attr);
831         }
832 
833         if (restart)
834                 rc2 = ibmveth_open(dev);
835 
836         return rc1 ? rc1 : rc2;
837 }
838 
839 static int ibmveth_set_features(struct net_device *dev,
840         netdev_features_t features)
841 {
842         struct ibmveth_adapter *adapter = netdev_priv(dev);
843         int rx_csum = !!(features & NETIF_F_RXCSUM);
844         int rc;
845 
846         if (rx_csum == adapter->rx_csum)
847                 return 0;
848 
849         rc = ibmveth_set_csum_offload(dev, rx_csum);
850         if (rc && !adapter->rx_csum)
851                 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
852 
853         return rc;
854 }
855 
856 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
857 {
858         int i;
859 
860         if (stringset != ETH_SS_STATS)
861                 return;
862 
863         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
864                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
865 }
866 
867 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
868 {
869         switch (sset) {
870         case ETH_SS_STATS:
871                 return ARRAY_SIZE(ibmveth_stats);
872         default:
873                 return -EOPNOTSUPP;
874         }
875 }
876 
877 static void ibmveth_get_ethtool_stats(struct net_device *dev,
878                                       struct ethtool_stats *stats, u64 *data)
879 {
880         int i;
881         struct ibmveth_adapter *adapter = netdev_priv(dev);
882 
883         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
884                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
885 }
886 
887 static const struct ethtool_ops netdev_ethtool_ops = {
888         .get_drvinfo            = netdev_get_drvinfo,
889         .get_settings           = netdev_get_settings,
890         .get_link               = ethtool_op_get_link,
891         .get_strings            = ibmveth_get_strings,
892         .get_sset_count         = ibmveth_get_sset_count,
893         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
894 };
895 
896 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
897 {
898         return -EOPNOTSUPP;
899 }
900 
901 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
902 
903 static int ibmveth_send(struct ibmveth_adapter *adapter,
904                         union ibmveth_buf_desc *descs)
905 {
906         unsigned long correlator;
907         unsigned int retry_count;
908         unsigned long ret;
909 
910         /*
911          * The retry count sets a maximum for the number of broadcast and
912          * multicast destinations within the system.
913          */
914         retry_count = 1024;
915         correlator = 0;
916         do {
917                 ret = h_send_logical_lan(adapter->vdev->unit_address,
918                                              descs[0].desc, descs[1].desc,
919                                              descs[2].desc, descs[3].desc,
920                                              descs[4].desc, descs[5].desc,
921                                              correlator, &correlator);
922         } while ((ret == H_BUSY) && (retry_count--));
923 
924         if (ret != H_SUCCESS && ret != H_DROPPED) {
925                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
926                            "with rc=%ld\n", ret);
927                 return 1;
928         }
929 
930         return 0;
931 }
932 
933 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
934                                       struct net_device *netdev)
935 {
936         struct ibmveth_adapter *adapter = netdev_priv(netdev);
937         unsigned int desc_flags;
938         union ibmveth_buf_desc descs[6];
939         int last, i;
940         int force_bounce = 0;
941         dma_addr_t dma_addr;
942 
943         /*
944          * veth handles a maximum of 6 segments including the header, so
945          * we have to linearize the skb if there are more than this.
946          */
947         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
948                 netdev->stats.tx_dropped++;
949                 goto out;
950         }
951 
952         /* veth can't checksum offload UDP */
953         if (skb->ip_summed == CHECKSUM_PARTIAL &&
954             ((skb->protocol == htons(ETH_P_IP) &&
955               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
956              (skb->protocol == htons(ETH_P_IPV6) &&
957               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
958             skb_checksum_help(skb)) {
959 
960                 netdev_err(netdev, "tx: failed to checksum packet\n");
961                 netdev->stats.tx_dropped++;
962                 goto out;
963         }
964 
965         desc_flags = IBMVETH_BUF_VALID;
966 
967         if (skb->ip_summed == CHECKSUM_PARTIAL) {
968                 unsigned char *buf = skb_transport_header(skb) +
969                                                 skb->csum_offset;
970 
971                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
972 
973                 /* Need to zero out the checksum */
974                 buf[0] = 0;
975                 buf[1] = 0;
976         }
977 
978 retry_bounce:
979         memset(descs, 0, sizeof(descs));
980 
981         /*
982          * If a linear packet is below the rx threshold then
983          * copy it into the static bounce buffer. This avoids the
984          * cost of a TCE insert and remove.
985          */
986         if (force_bounce || (!skb_is_nonlinear(skb) &&
987                                 (skb->len < tx_copybreak))) {
988                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
989                                           skb->len);
990 
991                 descs[0].fields.flags_len = desc_flags | skb->len;
992                 descs[0].fields.address = adapter->bounce_buffer_dma;
993 
994                 if (ibmveth_send(adapter, descs)) {
995                         adapter->tx_send_failed++;
996                         netdev->stats.tx_dropped++;
997                 } else {
998                         netdev->stats.tx_packets++;
999                         netdev->stats.tx_bytes += skb->len;
1000                 }
1001 
1002                 goto out;
1003         }
1004 
1005         /* Map the header */
1006         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1007                                   skb_headlen(skb), DMA_TO_DEVICE);
1008         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1009                 goto map_failed;
1010 
1011         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1012         descs[0].fields.address = dma_addr;
1013 
1014         /* Map the frags */
1015         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1016                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1017 
1018                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1019                                             skb_frag_size(frag), DMA_TO_DEVICE);
1020 
1021                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1022                         goto map_failed_frags;
1023 
1024                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1025                 descs[i+1].fields.address = dma_addr;
1026         }
1027 
1028         if (ibmveth_send(adapter, descs)) {
1029                 adapter->tx_send_failed++;
1030                 netdev->stats.tx_dropped++;
1031         } else {
1032                 netdev->stats.tx_packets++;
1033                 netdev->stats.tx_bytes += skb->len;
1034         }
1035 
1036         dma_unmap_single(&adapter->vdev->dev,
1037                          descs[0].fields.address,
1038                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1039                          DMA_TO_DEVICE);
1040 
1041         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1042                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1043                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1044                                DMA_TO_DEVICE);
1045 
1046 out:
1047         dev_consume_skb_any(skb);
1048         return NETDEV_TX_OK;
1049 
1050 map_failed_frags:
1051         last = i+1;
1052         for (i = 0; i < last; i++)
1053                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1054                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1055                                DMA_TO_DEVICE);
1056 
1057 map_failed:
1058         if (!firmware_has_feature(FW_FEATURE_CMO))
1059                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1060         adapter->tx_map_failed++;
1061         skb_linearize(skb);
1062         force_bounce = 1;
1063         goto retry_bounce;
1064 }
1065 
1066 static int ibmveth_poll(struct napi_struct *napi, int budget)
1067 {
1068         struct ibmveth_adapter *adapter =
1069                         container_of(napi, struct ibmveth_adapter, napi);
1070         struct net_device *netdev = adapter->netdev;
1071         int frames_processed = 0;
1072         unsigned long lpar_rc;
1073 
1074 restart_poll:
1075         while (frames_processed < budget) {
1076                 if (!ibmveth_rxq_pending_buffer(adapter))
1077                         break;
1078 
1079                 smp_rmb();
1080                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1081                         wmb(); /* suggested by larson1 */
1082                         adapter->rx_invalid_buffer++;
1083                         netdev_dbg(netdev, "recycling invalid buffer\n");
1084                         ibmveth_rxq_recycle_buffer(adapter);
1085                 } else {
1086                         struct sk_buff *skb, *new_skb;
1087                         int length = ibmveth_rxq_frame_length(adapter);
1088                         int offset = ibmveth_rxq_frame_offset(adapter);
1089                         int csum_good = ibmveth_rxq_csum_good(adapter);
1090 
1091                         skb = ibmveth_rxq_get_buffer(adapter);
1092 
1093                         new_skb = NULL;
1094                         if (length < rx_copybreak)
1095                                 new_skb = netdev_alloc_skb(netdev, length);
1096 
1097                         if (new_skb) {
1098                                 skb_copy_to_linear_data(new_skb,
1099                                                         skb->data + offset,
1100                                                         length);
1101                                 if (rx_flush)
1102                                         ibmveth_flush_buffer(skb->data,
1103                                                 length + offset);
1104                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1105                                         kfree_skb(skb);
1106                                 skb = new_skb;
1107                         } else {
1108                                 ibmveth_rxq_harvest_buffer(adapter);
1109                                 skb_reserve(skb, offset);
1110                         }
1111 
1112                         skb_put(skb, length);
1113                         skb->protocol = eth_type_trans(skb, netdev);
1114 
1115                         if (csum_good)
1116                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1117 
1118                         netif_receive_skb(skb); /* send it up */
1119 
1120                         netdev->stats.rx_packets++;
1121                         netdev->stats.rx_bytes += length;
1122                         frames_processed++;
1123                 }
1124         }
1125 
1126         ibmveth_replenish_task(adapter);
1127 
1128         if (frames_processed < budget) {
1129                 /* We think we are done - reenable interrupts,
1130                  * then check once more to make sure we are done.
1131                  */
1132                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1133                                        VIO_IRQ_ENABLE);
1134 
1135                 BUG_ON(lpar_rc != H_SUCCESS);
1136 
1137                 napi_complete(napi);
1138 
1139                 if (ibmveth_rxq_pending_buffer(adapter) &&
1140                     napi_reschedule(napi)) {
1141                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1142                                                VIO_IRQ_DISABLE);
1143                         goto restart_poll;
1144                 }
1145         }
1146 
1147         return frames_processed;
1148 }
1149 
1150 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1151 {
1152         struct net_device *netdev = dev_instance;
1153         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1154         unsigned long lpar_rc;
1155 
1156         if (napi_schedule_prep(&adapter->napi)) {
1157                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1158                                        VIO_IRQ_DISABLE);
1159                 BUG_ON(lpar_rc != H_SUCCESS);
1160                 __napi_schedule(&adapter->napi);
1161         }
1162         return IRQ_HANDLED;
1163 }
1164 
1165 static void ibmveth_set_multicast_list(struct net_device *netdev)
1166 {
1167         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1168         unsigned long lpar_rc;
1169 
1170         if ((netdev->flags & IFF_PROMISC) ||
1171             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1172                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1173                                            IbmVethMcastEnableRecv |
1174                                            IbmVethMcastDisableFiltering,
1175                                            0);
1176                 if (lpar_rc != H_SUCCESS) {
1177                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1178                                    "entering promisc mode\n", lpar_rc);
1179                 }
1180         } else {
1181                 struct netdev_hw_addr *ha;
1182                 /* clear the filter table & disable filtering */
1183                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1184                                            IbmVethMcastEnableRecv |
1185                                            IbmVethMcastDisableFiltering |
1186                                            IbmVethMcastClearFilterTable,
1187                                            0);
1188                 if (lpar_rc != H_SUCCESS) {
1189                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1190                                    "attempting to clear filter table\n",
1191                                    lpar_rc);
1192                 }
1193                 /* add the addresses to the filter table */
1194                 netdev_for_each_mc_addr(ha, netdev) {
1195                         /* add the multicast address to the filter table */
1196                         u64 mcast_addr;
1197                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1198                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1199                                                    IbmVethMcastAddFilter,
1200                                                    mcast_addr);
1201                         if (lpar_rc != H_SUCCESS) {
1202                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1203                                            "when adding an entry to the filter "
1204                                            "table\n", lpar_rc);
1205                         }
1206                 }
1207 
1208                 /* re-enable filtering */
1209                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1210                                            IbmVethMcastEnableFiltering,
1211                                            0);
1212                 if (lpar_rc != H_SUCCESS) {
1213                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1214                                    "enabling filtering\n", lpar_rc);
1215                 }
1216         }
1217 }
1218 
1219 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1220 {
1221         struct ibmveth_adapter *adapter = netdev_priv(dev);
1222         struct vio_dev *viodev = adapter->vdev;
1223         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1224         int i, rc;
1225         int need_restart = 0;
1226 
1227         if (new_mtu < IBMVETH_MIN_MTU)
1228                 return -EINVAL;
1229 
1230         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1231                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1232                         break;
1233 
1234         if (i == IBMVETH_NUM_BUFF_POOLS)
1235                 return -EINVAL;
1236 
1237         /* Deactivate all the buffer pools so that the next loop can activate
1238            only the buffer pools necessary to hold the new MTU */
1239         if (netif_running(adapter->netdev)) {
1240                 need_restart = 1;
1241                 adapter->pool_config = 1;
1242                 ibmveth_close(adapter->netdev);
1243                 adapter->pool_config = 0;
1244         }
1245 
1246         /* Look for an active buffer pool that can hold the new MTU */
1247         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1248                 adapter->rx_buff_pool[i].active = 1;
1249 
1250                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1251                         dev->mtu = new_mtu;
1252                         vio_cmo_set_dev_desired(viodev,
1253                                                 ibmveth_get_desired_dma
1254                                                 (viodev));
1255                         if (need_restart) {
1256                                 return ibmveth_open(adapter->netdev);
1257                         }
1258                         return 0;
1259                 }
1260         }
1261 
1262         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1263                 return rc;
1264 
1265         return -EINVAL;
1266 }
1267 
1268 #ifdef CONFIG_NET_POLL_CONTROLLER
1269 static void ibmveth_poll_controller(struct net_device *dev)
1270 {
1271         ibmveth_replenish_task(netdev_priv(dev));
1272         ibmveth_interrupt(dev->irq, dev);
1273 }
1274 #endif
1275 
1276 /**
1277  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1278  *
1279  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1280  *
1281  * Return value:
1282  *      Number of bytes of IO data the driver will need to perform well.
1283  */
1284 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1285 {
1286         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1287         struct ibmveth_adapter *adapter;
1288         struct iommu_table *tbl;
1289         unsigned long ret;
1290         int i;
1291         int rxqentries = 1;
1292 
1293         tbl = get_iommu_table_base(&vdev->dev);
1294 
1295         /* netdev inits at probe time along with the structures we need below*/
1296         if (netdev == NULL)
1297                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1298 
1299         adapter = netdev_priv(netdev);
1300 
1301         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1302         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1303 
1304         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1305                 /* add the size of the active receive buffers */
1306                 if (adapter->rx_buff_pool[i].active)
1307                         ret +=
1308                             adapter->rx_buff_pool[i].size *
1309                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1310                                              buff_size, tbl);
1311                 rxqentries += adapter->rx_buff_pool[i].size;
1312         }
1313         /* add the size of the receive queue entries */
1314         ret += IOMMU_PAGE_ALIGN(
1315                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1316 
1317         return ret;
1318 }
1319 
1320 static const struct net_device_ops ibmveth_netdev_ops = {
1321         .ndo_open               = ibmveth_open,
1322         .ndo_stop               = ibmveth_close,
1323         .ndo_start_xmit         = ibmveth_start_xmit,
1324         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1325         .ndo_do_ioctl           = ibmveth_ioctl,
1326         .ndo_change_mtu         = ibmveth_change_mtu,
1327         .ndo_fix_features       = ibmveth_fix_features,
1328         .ndo_set_features       = ibmveth_set_features,
1329         .ndo_validate_addr      = eth_validate_addr,
1330         .ndo_set_mac_address    = eth_mac_addr,
1331 #ifdef CONFIG_NET_POLL_CONTROLLER
1332         .ndo_poll_controller    = ibmveth_poll_controller,
1333 #endif
1334 };
1335 
1336 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1337 {
1338         int rc, i, mac_len;
1339         struct net_device *netdev;
1340         struct ibmveth_adapter *adapter;
1341         unsigned char *mac_addr_p;
1342         unsigned int *mcastFilterSize_p;
1343 
1344         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1345                 dev->unit_address);
1346 
1347         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1348                                                         &mac_len);
1349         if (!mac_addr_p) {
1350                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1351                 return -EINVAL;
1352         }
1353         /* Workaround for old/broken pHyp */
1354         if (mac_len == 8)
1355                 mac_addr_p += 2;
1356         else if (mac_len != 6) {
1357                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1358                         mac_len);
1359                 return -EINVAL;
1360         }
1361 
1362         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1363                                                 VETH_MCAST_FILTER_SIZE, NULL);
1364         if (!mcastFilterSize_p) {
1365                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1366                         "attribute\n");
1367                 return -EINVAL;
1368         }
1369 
1370         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1371 
1372         if (!netdev)
1373                 return -ENOMEM;
1374 
1375         adapter = netdev_priv(netdev);
1376         dev_set_drvdata(&dev->dev, netdev);
1377 
1378         adapter->vdev = dev;
1379         adapter->netdev = netdev;
1380         adapter->mcastFilterSize = *mcastFilterSize_p;
1381         adapter->pool_config = 0;
1382 
1383         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1384 
1385         netdev->irq = dev->irq;
1386         netdev->netdev_ops = &ibmveth_netdev_ops;
1387         netdev->ethtool_ops = &netdev_ethtool_ops;
1388         SET_NETDEV_DEV(netdev, &dev->dev);
1389         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1390                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1391         netdev->features |= netdev->hw_features;
1392 
1393         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1394 
1395         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1396                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1397                 int error;
1398 
1399                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1400                                          pool_count[i], pool_size[i],
1401                                          pool_active[i]);
1402                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1403                                              &dev->dev.kobj, "pool%d", i);
1404                 if (!error)
1405                         kobject_uevent(kobj, KOBJ_ADD);
1406         }
1407 
1408         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1409 
1410         adapter->buffer_list_dma = DMA_ERROR_CODE;
1411         adapter->filter_list_dma = DMA_ERROR_CODE;
1412         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1413 
1414         netdev_dbg(netdev, "registering netdev...\n");
1415 
1416         ibmveth_set_features(netdev, netdev->features);
1417 
1418         rc = register_netdev(netdev);
1419 
1420         if (rc) {
1421                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1422                 free_netdev(netdev);
1423                 return rc;
1424         }
1425 
1426         netdev_dbg(netdev, "registered\n");
1427 
1428         return 0;
1429 }
1430 
1431 static int ibmveth_remove(struct vio_dev *dev)
1432 {
1433         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1434         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1435         int i;
1436 
1437         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1438                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1439 
1440         unregister_netdev(netdev);
1441 
1442         free_netdev(netdev);
1443         dev_set_drvdata(&dev->dev, NULL);
1444 
1445         return 0;
1446 }
1447 
1448 static struct attribute veth_active_attr;
1449 static struct attribute veth_num_attr;
1450 static struct attribute veth_size_attr;
1451 
1452 static ssize_t veth_pool_show(struct kobject *kobj,
1453                               struct attribute *attr, char *buf)
1454 {
1455         struct ibmveth_buff_pool *pool = container_of(kobj,
1456                                                       struct ibmveth_buff_pool,
1457                                                       kobj);
1458 
1459         if (attr == &veth_active_attr)
1460                 return sprintf(buf, "%d\n", pool->active);
1461         else if (attr == &veth_num_attr)
1462                 return sprintf(buf, "%d\n", pool->size);
1463         else if (attr == &veth_size_attr)
1464                 return sprintf(buf, "%d\n", pool->buff_size);
1465         return 0;
1466 }
1467 
1468 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1469                                const char *buf, size_t count)
1470 {
1471         struct ibmveth_buff_pool *pool = container_of(kobj,
1472                                                       struct ibmveth_buff_pool,
1473                                                       kobj);
1474         struct net_device *netdev = dev_get_drvdata(
1475             container_of(kobj->parent, struct device, kobj));
1476         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1477         long value = simple_strtol(buf, NULL, 10);
1478         long rc;
1479 
1480         if (attr == &veth_active_attr) {
1481                 if (value && !pool->active) {
1482                         if (netif_running(netdev)) {
1483                                 if (ibmveth_alloc_buffer_pool(pool)) {
1484                                         netdev_err(netdev,
1485                                                    "unable to alloc pool\n");
1486                                         return -ENOMEM;
1487                                 }
1488                                 pool->active = 1;
1489                                 adapter->pool_config = 1;
1490                                 ibmveth_close(netdev);
1491                                 adapter->pool_config = 0;
1492                                 if ((rc = ibmveth_open(netdev)))
1493                                         return rc;
1494                         } else {
1495                                 pool->active = 1;
1496                         }
1497                 } else if (!value && pool->active) {
1498                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1499                         int i;
1500                         /* Make sure there is a buffer pool with buffers that
1501                            can hold a packet of the size of the MTU */
1502                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503                                 if (pool == &adapter->rx_buff_pool[i])
1504                                         continue;
1505                                 if (!adapter->rx_buff_pool[i].active)
1506                                         continue;
1507                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1508                                         break;
1509                         }
1510 
1511                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1512                                 netdev_err(netdev, "no active pool >= MTU\n");
1513                                 return -EPERM;
1514                         }
1515 
1516                         if (netif_running(netdev)) {
1517                                 adapter->pool_config = 1;
1518                                 ibmveth_close(netdev);
1519                                 pool->active = 0;
1520                                 adapter->pool_config = 0;
1521                                 if ((rc = ibmveth_open(netdev)))
1522                                         return rc;
1523                         }
1524                         pool->active = 0;
1525                 }
1526         } else if (attr == &veth_num_attr) {
1527                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1528                         return -EINVAL;
1529                 } else {
1530                         if (netif_running(netdev)) {
1531                                 adapter->pool_config = 1;
1532                                 ibmveth_close(netdev);
1533                                 adapter->pool_config = 0;
1534                                 pool->size = value;
1535                                 if ((rc = ibmveth_open(netdev)))
1536                                         return rc;
1537                         } else {
1538                                 pool->size = value;
1539                         }
1540                 }
1541         } else if (attr == &veth_size_attr) {
1542                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1543                         return -EINVAL;
1544                 } else {
1545                         if (netif_running(netdev)) {
1546                                 adapter->pool_config = 1;
1547                                 ibmveth_close(netdev);
1548                                 adapter->pool_config = 0;
1549                                 pool->buff_size = value;
1550                                 if ((rc = ibmveth_open(netdev)))
1551                                         return rc;
1552                         } else {
1553                                 pool->buff_size = value;
1554                         }
1555                 }
1556         }
1557 
1558         /* kick the interrupt handler to allocate/deallocate pools */
1559         ibmveth_interrupt(netdev->irq, netdev);
1560         return count;
1561 }
1562 
1563 
1564 #define ATTR(_name, _mode)                              \
1565         struct attribute veth_##_name##_attr = {        \
1566         .name = __stringify(_name), .mode = _mode,      \
1567         };
1568 
1569 static ATTR(active, 0644);
1570 static ATTR(num, 0644);
1571 static ATTR(size, 0644);
1572 
1573 static struct attribute *veth_pool_attrs[] = {
1574         &veth_active_attr,
1575         &veth_num_attr,
1576         &veth_size_attr,
1577         NULL,
1578 };
1579 
1580 static const struct sysfs_ops veth_pool_ops = {
1581         .show   = veth_pool_show,
1582         .store  = veth_pool_store,
1583 };
1584 
1585 static struct kobj_type ktype_veth_pool = {
1586         .release        = NULL,
1587         .sysfs_ops      = &veth_pool_ops,
1588         .default_attrs  = veth_pool_attrs,
1589 };
1590 
1591 static int ibmveth_resume(struct device *dev)
1592 {
1593         struct net_device *netdev = dev_get_drvdata(dev);
1594         ibmveth_interrupt(netdev->irq, netdev);
1595         return 0;
1596 }
1597 
1598 static struct vio_device_id ibmveth_device_table[] = {
1599         { "network", "IBM,l-lan"},
1600         { "", "" }
1601 };
1602 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1603 
1604 static struct dev_pm_ops ibmveth_pm_ops = {
1605         .resume = ibmveth_resume
1606 };
1607 
1608 static struct vio_driver ibmveth_driver = {
1609         .id_table       = ibmveth_device_table,
1610         .probe          = ibmveth_probe,
1611         .remove         = ibmveth_remove,
1612         .get_desired_dma = ibmveth_get_desired_dma,
1613         .name           = ibmveth_driver_name,
1614         .pm             = &ibmveth_pm_ops,
1615 };
1616 
1617 static int __init ibmveth_module_init(void)
1618 {
1619         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1620                ibmveth_driver_string, ibmveth_driver_version);
1621 
1622         return vio_register_driver(&ibmveth_driver);
1623 }
1624 
1625 static void __exit ibmveth_module_exit(void)
1626 {
1627         vio_unregister_driver(&ibmveth_driver);
1628 }
1629 
1630 module_init(ibmveth_module_init);
1631 module_exit(ibmveth_module_exit);
1632 

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