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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 "1.05"
 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 static bool old_large_send __read_mostly;
 83 module_param(old_large_send, bool, S_IRUGO);
 84 MODULE_PARM_DESC(old_large_send,
 85         "Use old large send method on firmware that supports the new method");
 86 
 87 struct ibmveth_stat {
 88         char name[ETH_GSTRING_LEN];
 89         int offset;
 90 };
 91 
 92 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
 93 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
 94 
 95 struct ibmveth_stat ibmveth_stats[] = {
 96         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
 97         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
 98         { "replenish_add_buff_failure",
 99                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
100         { "replenish_add_buff_success",
101                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
102         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
103         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
104         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
105         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
106         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
107         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
108         { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
109         { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
110         { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
111 };
112 
113 /* simple methods of getting data from the current rxq entry */
114 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
115 {
116         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
117 }
118 
119 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
120 {
121         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
122                         IBMVETH_RXQ_TOGGLE_SHIFT;
123 }
124 
125 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
126 {
127         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
128 }
129 
130 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
131 {
132         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
133 }
134 
135 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
136 {
137         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
138 }
139 
140 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
141 {
142         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
143 }
144 
145 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
146 {
147         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
148 }
149 
150 /* setup the initial settings for a buffer pool */
151 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
152                                      u32 pool_index, u32 pool_size,
153                                      u32 buff_size, u32 pool_active)
154 {
155         pool->size = pool_size;
156         pool->index = pool_index;
157         pool->buff_size = buff_size;
158         pool->threshold = pool_size * 7 / 8;
159         pool->active = pool_active;
160 }
161 
162 /* allocate and setup an buffer pool - called during open */
163 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
164 {
165         int i;
166 
167         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
168 
169         if (!pool->free_map)
170                 return -1;
171 
172         pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
173         if (!pool->dma_addr) {
174                 kfree(pool->free_map);
175                 pool->free_map = NULL;
176                 return -1;
177         }
178 
179         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
180 
181         if (!pool->skbuff) {
182                 kfree(pool->dma_addr);
183                 pool->dma_addr = NULL;
184 
185                 kfree(pool->free_map);
186                 pool->free_map = NULL;
187                 return -1;
188         }
189 
190         for (i = 0; i < pool->size; ++i)
191                 pool->free_map[i] = i;
192 
193         atomic_set(&pool->available, 0);
194         pool->producer_index = 0;
195         pool->consumer_index = 0;
196 
197         return 0;
198 }
199 
200 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
201 {
202         unsigned long offset;
203 
204         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
205                 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
206 }
207 
208 /* replenish the buffers for a pool.  note that we don't need to
209  * skb_reserve these since they are used for incoming...
210  */
211 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
212                                           struct ibmveth_buff_pool *pool)
213 {
214         u32 i;
215         u32 count = pool->size - atomic_read(&pool->available);
216         u32 buffers_added = 0;
217         struct sk_buff *skb;
218         unsigned int free_index, index;
219         u64 correlator;
220         unsigned long lpar_rc;
221         dma_addr_t dma_addr;
222 
223         mb();
224 
225         for (i = 0; i < count; ++i) {
226                 union ibmveth_buf_desc desc;
227 
228                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
229 
230                 if (!skb) {
231                         netdev_dbg(adapter->netdev,
232                                    "replenish: unable to allocate skb\n");
233                         adapter->replenish_no_mem++;
234                         break;
235                 }
236 
237                 free_index = pool->consumer_index;
238                 pool->consumer_index++;
239                 if (pool->consumer_index >= pool->size)
240                         pool->consumer_index = 0;
241                 index = pool->free_map[free_index];
242 
243                 BUG_ON(index == IBM_VETH_INVALID_MAP);
244                 BUG_ON(pool->skbuff[index] != NULL);
245 
246                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
247                                 pool->buff_size, DMA_FROM_DEVICE);
248 
249                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
250                         goto failure;
251 
252                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
253                 pool->dma_addr[index] = dma_addr;
254                 pool->skbuff[index] = skb;
255 
256                 correlator = ((u64)pool->index << 32) | index;
257                 *(u64 *)skb->data = correlator;
258 
259                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
260                 desc.fields.address = dma_addr;
261 
262                 if (rx_flush) {
263                         unsigned int len = min(pool->buff_size,
264                                                 adapter->netdev->mtu +
265                                                 IBMVETH_BUFF_OH);
266                         ibmveth_flush_buffer(skb->data, len);
267                 }
268                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
269                                                    desc.desc);
270 
271                 if (lpar_rc != H_SUCCESS) {
272                         goto failure;
273                 } else {
274                         buffers_added++;
275                         adapter->replenish_add_buff_success++;
276                 }
277         }
278 
279         mb();
280         atomic_add(buffers_added, &(pool->available));
281         return;
282 
283 failure:
284         pool->free_map[free_index] = index;
285         pool->skbuff[index] = NULL;
286         if (pool->consumer_index == 0)
287                 pool->consumer_index = pool->size - 1;
288         else
289                 pool->consumer_index--;
290         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
291                 dma_unmap_single(&adapter->vdev->dev,
292                                  pool->dma_addr[index], pool->buff_size,
293                                  DMA_FROM_DEVICE);
294         dev_kfree_skb_any(skb);
295         adapter->replenish_add_buff_failure++;
296 
297         mb();
298         atomic_add(buffers_added, &(pool->available));
299 }
300 
301 /*
302  * The final 8 bytes of the buffer list is a counter of frames dropped
303  * because there was not a buffer in the buffer list capable of holding
304  * the frame.
305  */
306 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
307 {
308         __be64 *p = adapter->buffer_list_addr + 4096 - 8;
309 
310         adapter->rx_no_buffer = be64_to_cpup(p);
311 }
312 
313 /* replenish routine */
314 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
315 {
316         int i;
317 
318         adapter->replenish_task_cycles++;
319 
320         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
321                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
322 
323                 if (pool->active &&
324                     (atomic_read(&pool->available) < pool->threshold))
325                         ibmveth_replenish_buffer_pool(adapter, pool);
326         }
327 
328         ibmveth_update_rx_no_buffer(adapter);
329 }
330 
331 /* empty and free ana buffer pool - also used to do cleanup in error paths */
332 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
333                                      struct ibmveth_buff_pool *pool)
334 {
335         int i;
336 
337         kfree(pool->free_map);
338         pool->free_map = NULL;
339 
340         if (pool->skbuff && pool->dma_addr) {
341                 for (i = 0; i < pool->size; ++i) {
342                         struct sk_buff *skb = pool->skbuff[i];
343                         if (skb) {
344                                 dma_unmap_single(&adapter->vdev->dev,
345                                                  pool->dma_addr[i],
346                                                  pool->buff_size,
347                                                  DMA_FROM_DEVICE);
348                                 dev_kfree_skb_any(skb);
349                                 pool->skbuff[i] = NULL;
350                         }
351                 }
352         }
353 
354         if (pool->dma_addr) {
355                 kfree(pool->dma_addr);
356                 pool->dma_addr = NULL;
357         }
358 
359         if (pool->skbuff) {
360                 kfree(pool->skbuff);
361                 pool->skbuff = NULL;
362         }
363 }
364 
365 /* remove a buffer from a pool */
366 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
367                                             u64 correlator)
368 {
369         unsigned int pool  = correlator >> 32;
370         unsigned int index = correlator & 0xffffffffUL;
371         unsigned int free_index;
372         struct sk_buff *skb;
373 
374         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
375         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
376 
377         skb = adapter->rx_buff_pool[pool].skbuff[index];
378 
379         BUG_ON(skb == NULL);
380 
381         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
382 
383         dma_unmap_single(&adapter->vdev->dev,
384                          adapter->rx_buff_pool[pool].dma_addr[index],
385                          adapter->rx_buff_pool[pool].buff_size,
386                          DMA_FROM_DEVICE);
387 
388         free_index = adapter->rx_buff_pool[pool].producer_index;
389         adapter->rx_buff_pool[pool].producer_index++;
390         if (adapter->rx_buff_pool[pool].producer_index >=
391             adapter->rx_buff_pool[pool].size)
392                 adapter->rx_buff_pool[pool].producer_index = 0;
393         adapter->rx_buff_pool[pool].free_map[free_index] = index;
394 
395         mb();
396 
397         atomic_dec(&(adapter->rx_buff_pool[pool].available));
398 }
399 
400 /* get the current buffer on the rx queue */
401 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
402 {
403         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
404         unsigned int pool = correlator >> 32;
405         unsigned int index = correlator & 0xffffffffUL;
406 
407         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
408         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
409 
410         return adapter->rx_buff_pool[pool].skbuff[index];
411 }
412 
413 /* recycle the current buffer on the rx queue */
414 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
415 {
416         u32 q_index = adapter->rx_queue.index;
417         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
418         unsigned int pool = correlator >> 32;
419         unsigned int index = correlator & 0xffffffffUL;
420         union ibmveth_buf_desc desc;
421         unsigned long lpar_rc;
422         int ret = 1;
423 
424         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
425         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
426 
427         if (!adapter->rx_buff_pool[pool].active) {
428                 ibmveth_rxq_harvest_buffer(adapter);
429                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
430                 goto out;
431         }
432 
433         desc.fields.flags_len = IBMVETH_BUF_VALID |
434                 adapter->rx_buff_pool[pool].buff_size;
435         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
436 
437         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
438 
439         if (lpar_rc != H_SUCCESS) {
440                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
441                            "during recycle rc=%ld", lpar_rc);
442                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
443                 ret = 0;
444         }
445 
446         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
447                 adapter->rx_queue.index = 0;
448                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
449         }
450 
451 out:
452         return ret;
453 }
454 
455 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
456 {
457         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
458 
459         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
460                 adapter->rx_queue.index = 0;
461                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
462         }
463 }
464 
465 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
466 {
467         int i;
468         struct device *dev = &adapter->vdev->dev;
469 
470         if (adapter->buffer_list_addr != NULL) {
471                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
472                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
473                                         DMA_BIDIRECTIONAL);
474                         adapter->buffer_list_dma = DMA_ERROR_CODE;
475                 }
476                 free_page((unsigned long)adapter->buffer_list_addr);
477                 adapter->buffer_list_addr = NULL;
478         }
479 
480         if (adapter->filter_list_addr != NULL) {
481                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
482                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
483                                         DMA_BIDIRECTIONAL);
484                         adapter->filter_list_dma = DMA_ERROR_CODE;
485                 }
486                 free_page((unsigned long)adapter->filter_list_addr);
487                 adapter->filter_list_addr = NULL;
488         }
489 
490         if (adapter->rx_queue.queue_addr != NULL) {
491                 dma_free_coherent(dev, adapter->rx_queue.queue_len,
492                                   adapter->rx_queue.queue_addr,
493                                   adapter->rx_queue.queue_dma);
494                 adapter->rx_queue.queue_addr = NULL;
495         }
496 
497         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
498                 if (adapter->rx_buff_pool[i].active)
499                         ibmveth_free_buffer_pool(adapter,
500                                                  &adapter->rx_buff_pool[i]);
501 
502         if (adapter->bounce_buffer != NULL) {
503                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
504                         dma_unmap_single(&adapter->vdev->dev,
505                                         adapter->bounce_buffer_dma,
506                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
507                                         DMA_BIDIRECTIONAL);
508                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
509                 }
510                 kfree(adapter->bounce_buffer);
511                 adapter->bounce_buffer = NULL;
512         }
513 }
514 
515 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
516         union ibmveth_buf_desc rxq_desc, u64 mac_address)
517 {
518         int rc, try_again = 1;
519 
520         /*
521          * After a kexec the adapter will still be open, so our attempt to
522          * open it will fail. So if we get a failure we free the adapter and
523          * try again, but only once.
524          */
525 retry:
526         rc = h_register_logical_lan(adapter->vdev->unit_address,
527                                     adapter->buffer_list_dma, rxq_desc.desc,
528                                     adapter->filter_list_dma, mac_address);
529 
530         if (rc != H_SUCCESS && try_again) {
531                 do {
532                         rc = h_free_logical_lan(adapter->vdev->unit_address);
533                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
534 
535                 try_again = 0;
536                 goto retry;
537         }
538 
539         return rc;
540 }
541 
542 static u64 ibmveth_encode_mac_addr(u8 *mac)
543 {
544         int i;
545         u64 encoded = 0;
546 
547         for (i = 0; i < ETH_ALEN; i++)
548                 encoded = (encoded << 8) | mac[i];
549 
550         return encoded;
551 }
552 
553 static int ibmveth_open(struct net_device *netdev)
554 {
555         struct ibmveth_adapter *adapter = netdev_priv(netdev);
556         u64 mac_address;
557         int rxq_entries = 1;
558         unsigned long lpar_rc;
559         int rc;
560         union ibmveth_buf_desc rxq_desc;
561         int i;
562         struct device *dev;
563 
564         netdev_dbg(netdev, "open starting\n");
565 
566         napi_enable(&adapter->napi);
567 
568         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
569                 rxq_entries += adapter->rx_buff_pool[i].size;
570 
571         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
572         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
573 
574         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
575                 netdev_err(netdev, "unable to allocate filter or buffer list "
576                            "pages\n");
577                 rc = -ENOMEM;
578                 goto err_out;
579         }
580 
581         dev = &adapter->vdev->dev;
582 
583         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
584                                                 rxq_entries;
585         adapter->rx_queue.queue_addr =
586                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
587                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
588         if (!adapter->rx_queue.queue_addr) {
589                 rc = -ENOMEM;
590                 goto err_out;
591         }
592 
593         adapter->buffer_list_dma = dma_map_single(dev,
594                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
595         adapter->filter_list_dma = dma_map_single(dev,
596                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
597 
598         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
599             (dma_mapping_error(dev, adapter->filter_list_dma))) {
600                 netdev_err(netdev, "unable to map filter or buffer list "
601                            "pages\n");
602                 rc = -ENOMEM;
603                 goto err_out;
604         }
605 
606         adapter->rx_queue.index = 0;
607         adapter->rx_queue.num_slots = rxq_entries;
608         adapter->rx_queue.toggle = 1;
609 
610         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
611 
612         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
613                                         adapter->rx_queue.queue_len;
614         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
615 
616         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
617         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
618         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
619 
620         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
621 
622         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
623 
624         if (lpar_rc != H_SUCCESS) {
625                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
626                            lpar_rc);
627                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
628                            "desc:0x%llx MAC:0x%llx\n",
629                                      adapter->buffer_list_dma,
630                                      adapter->filter_list_dma,
631                                      rxq_desc.desc,
632                                      mac_address);
633                 rc = -ENONET;
634                 goto err_out;
635         }
636 
637         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
638                 if (!adapter->rx_buff_pool[i].active)
639                         continue;
640                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
641                         netdev_err(netdev, "unable to alloc pool\n");
642                         adapter->rx_buff_pool[i].active = 0;
643                         rc = -ENOMEM;
644                         goto err_out;
645                 }
646         }
647 
648         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
649         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
650                          netdev);
651         if (rc != 0) {
652                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
653                            netdev->irq, rc);
654                 do {
655                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
656                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
657 
658                 goto err_out;
659         }
660 
661         adapter->bounce_buffer =
662             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
663         if (!adapter->bounce_buffer) {
664                 rc = -ENOMEM;
665                 goto err_out_free_irq;
666         }
667         adapter->bounce_buffer_dma =
668             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
669                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
670         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
671                 netdev_err(netdev, "unable to map bounce buffer\n");
672                 rc = -ENOMEM;
673                 goto err_out_free_irq;
674         }
675 
676         netdev_dbg(netdev, "initial replenish cycle\n");
677         ibmveth_interrupt(netdev->irq, netdev);
678 
679         netif_start_queue(netdev);
680 
681         netdev_dbg(netdev, "open complete\n");
682 
683         return 0;
684 
685 err_out_free_irq:
686         free_irq(netdev->irq, netdev);
687 err_out:
688         ibmveth_cleanup(adapter);
689         napi_disable(&adapter->napi);
690         return rc;
691 }
692 
693 static int ibmveth_close(struct net_device *netdev)
694 {
695         struct ibmveth_adapter *adapter = netdev_priv(netdev);
696         long lpar_rc;
697 
698         netdev_dbg(netdev, "close starting\n");
699 
700         napi_disable(&adapter->napi);
701 
702         if (!adapter->pool_config)
703                 netif_stop_queue(netdev);
704 
705         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
706 
707         do {
708                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
709         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
710 
711         if (lpar_rc != H_SUCCESS) {
712                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
713                            "continuing with close\n", lpar_rc);
714         }
715 
716         free_irq(netdev->irq, netdev);
717 
718         ibmveth_update_rx_no_buffer(adapter);
719 
720         ibmveth_cleanup(adapter);
721 
722         netdev_dbg(netdev, "close complete\n");
723 
724         return 0;
725 }
726 
727 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
728 {
729         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
730                                 SUPPORTED_FIBRE);
731         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
732                                 ADVERTISED_FIBRE);
733         ethtool_cmd_speed_set(cmd, SPEED_1000);
734         cmd->duplex = DUPLEX_FULL;
735         cmd->port = PORT_FIBRE;
736         cmd->phy_address = 0;
737         cmd->transceiver = XCVR_INTERNAL;
738         cmd->autoneg = AUTONEG_ENABLE;
739         cmd->maxtxpkt = 0;
740         cmd->maxrxpkt = 1;
741         return 0;
742 }
743 
744 static void netdev_get_drvinfo(struct net_device *dev,
745                                struct ethtool_drvinfo *info)
746 {
747         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
748         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
749 }
750 
751 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
752         netdev_features_t features)
753 {
754         /*
755          * Since the ibmveth firmware interface does not have the
756          * concept of separate tx/rx checksum offload enable, if rx
757          * checksum is disabled we also have to disable tx checksum
758          * offload. Once we disable rx checksum offload, we are no
759          * longer allowed to send tx buffers that are not properly
760          * checksummed.
761          */
762 
763         if (!(features & NETIF_F_RXCSUM))
764                 features &= ~NETIF_F_CSUM_MASK;
765 
766         return features;
767 }
768 
769 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
770 {
771         struct ibmveth_adapter *adapter = netdev_priv(dev);
772         unsigned long set_attr, clr_attr, ret_attr;
773         unsigned long set_attr6, clr_attr6;
774         long ret, ret4, ret6;
775         int rc1 = 0, rc2 = 0;
776         int restart = 0;
777 
778         if (netif_running(dev)) {
779                 restart = 1;
780                 adapter->pool_config = 1;
781                 ibmveth_close(dev);
782                 adapter->pool_config = 0;
783         }
784 
785         set_attr = 0;
786         clr_attr = 0;
787         set_attr6 = 0;
788         clr_attr6 = 0;
789 
790         if (data) {
791                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
792                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
793         } else {
794                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
795                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
796         }
797 
798         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
799 
800         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
801             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
802             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
803                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
804                                          set_attr, &ret_attr);
805 
806                 if (ret4 != H_SUCCESS) {
807                         netdev_err(dev, "unable to change IPv4 checksum "
808                                         "offload settings. %d rc=%ld\n",
809                                         data, ret4);
810 
811                         h_illan_attributes(adapter->vdev->unit_address,
812                                            set_attr, clr_attr, &ret_attr);
813 
814                         if (data == 1)
815                                 dev->features &= ~NETIF_F_IP_CSUM;
816 
817                 } else {
818                         adapter->fw_ipv4_csum_support = data;
819                 }
820 
821                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
822                                          clr_attr6, set_attr6, &ret_attr);
823 
824                 if (ret6 != H_SUCCESS) {
825                         netdev_err(dev, "unable to change IPv6 checksum "
826                                         "offload settings. %d rc=%ld\n",
827                                         data, ret6);
828 
829                         h_illan_attributes(adapter->vdev->unit_address,
830                                            set_attr6, clr_attr6, &ret_attr);
831 
832                         if (data == 1)
833                                 dev->features &= ~NETIF_F_IPV6_CSUM;
834 
835                 } else
836                         adapter->fw_ipv6_csum_support = data;
837 
838                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
839                         adapter->rx_csum = data;
840                 else
841                         rc1 = -EIO;
842         } else {
843                 rc1 = -EIO;
844                 netdev_err(dev, "unable to change checksum offload settings."
845                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
846                                      ret_attr);
847         }
848 
849         if (restart)
850                 rc2 = ibmveth_open(dev);
851 
852         return rc1 ? rc1 : rc2;
853 }
854 
855 static int ibmveth_set_tso(struct net_device *dev, u32 data)
856 {
857         struct ibmveth_adapter *adapter = netdev_priv(dev);
858         unsigned long set_attr, clr_attr, ret_attr;
859         long ret1, ret2;
860         int rc1 = 0, rc2 = 0;
861         int restart = 0;
862 
863         if (netif_running(dev)) {
864                 restart = 1;
865                 adapter->pool_config = 1;
866                 ibmveth_close(dev);
867                 adapter->pool_config = 0;
868         }
869 
870         set_attr = 0;
871         clr_attr = 0;
872 
873         if (data)
874                 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
875         else
876                 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
877 
878         ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
879 
880         if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
881             !old_large_send) {
882                 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
883                                           set_attr, &ret_attr);
884 
885                 if (ret2 != H_SUCCESS) {
886                         netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
887                                    data, ret2);
888 
889                         h_illan_attributes(adapter->vdev->unit_address,
890                                            set_attr, clr_attr, &ret_attr);
891 
892                         if (data == 1)
893                                 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
894                         rc1 = -EIO;
895 
896                 } else {
897                         adapter->fw_large_send_support = data;
898                         adapter->large_send = data;
899                 }
900         } else {
901                 /* Older firmware version of large send offload does not
902                  * support tcp6/ipv6
903                  */
904                 if (data == 1) {
905                         dev->features &= ~NETIF_F_TSO6;
906                         netdev_info(dev, "TSO feature requires all partitions to have updated driver");
907                 }
908                 adapter->large_send = data;
909         }
910 
911         if (restart)
912                 rc2 = ibmveth_open(dev);
913 
914         return rc1 ? rc1 : rc2;
915 }
916 
917 static int ibmveth_set_features(struct net_device *dev,
918         netdev_features_t features)
919 {
920         struct ibmveth_adapter *adapter = netdev_priv(dev);
921         int rx_csum = !!(features & NETIF_F_RXCSUM);
922         int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
923         int rc1 = 0, rc2 = 0;
924 
925         if (rx_csum != adapter->rx_csum) {
926                 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
927                 if (rc1 && !adapter->rx_csum)
928                         dev->features =
929                                 features & ~(NETIF_F_CSUM_MASK |
930                                              NETIF_F_RXCSUM);
931         }
932 
933         if (large_send != adapter->large_send) {
934                 rc2 = ibmveth_set_tso(dev, large_send);
935                 if (rc2 && !adapter->large_send)
936                         dev->features =
937                                 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
938         }
939 
940         return rc1 ? rc1 : rc2;
941 }
942 
943 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
944 {
945         int i;
946 
947         if (stringset != ETH_SS_STATS)
948                 return;
949 
950         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
951                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
952 }
953 
954 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
955 {
956         switch (sset) {
957         case ETH_SS_STATS:
958                 return ARRAY_SIZE(ibmveth_stats);
959         default:
960                 return -EOPNOTSUPP;
961         }
962 }
963 
964 static void ibmveth_get_ethtool_stats(struct net_device *dev,
965                                       struct ethtool_stats *stats, u64 *data)
966 {
967         int i;
968         struct ibmveth_adapter *adapter = netdev_priv(dev);
969 
970         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
971                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
972 }
973 
974 static const struct ethtool_ops netdev_ethtool_ops = {
975         .get_drvinfo            = netdev_get_drvinfo,
976         .get_settings           = netdev_get_settings,
977         .get_link               = ethtool_op_get_link,
978         .get_strings            = ibmveth_get_strings,
979         .get_sset_count         = ibmveth_get_sset_count,
980         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
981 };
982 
983 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
984 {
985         return -EOPNOTSUPP;
986 }
987 
988 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
989 
990 static int ibmveth_send(struct ibmveth_adapter *adapter,
991                         union ibmveth_buf_desc *descs, unsigned long mss)
992 {
993         unsigned long correlator;
994         unsigned int retry_count;
995         unsigned long ret;
996 
997         /*
998          * The retry count sets a maximum for the number of broadcast and
999          * multicast destinations within the system.
1000          */
1001         retry_count = 1024;
1002         correlator = 0;
1003         do {
1004                 ret = h_send_logical_lan(adapter->vdev->unit_address,
1005                                              descs[0].desc, descs[1].desc,
1006                                              descs[2].desc, descs[3].desc,
1007                                              descs[4].desc, descs[5].desc,
1008                                              correlator, &correlator, mss,
1009                                              adapter->fw_large_send_support);
1010         } while ((ret == H_BUSY) && (retry_count--));
1011 
1012         if (ret != H_SUCCESS && ret != H_DROPPED) {
1013                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1014                            "with rc=%ld\n", ret);
1015                 return 1;
1016         }
1017 
1018         return 0;
1019 }
1020 
1021 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1022                                       struct net_device *netdev)
1023 {
1024         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1025         unsigned int desc_flags;
1026         union ibmveth_buf_desc descs[6];
1027         int last, i;
1028         int force_bounce = 0;
1029         dma_addr_t dma_addr;
1030         unsigned long mss = 0;
1031 
1032         /*
1033          * veth handles a maximum of 6 segments including the header, so
1034          * we have to linearize the skb if there are more than this.
1035          */
1036         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1037                 netdev->stats.tx_dropped++;
1038                 goto out;
1039         }
1040 
1041         /* veth can't checksum offload UDP */
1042         if (skb->ip_summed == CHECKSUM_PARTIAL &&
1043             ((skb->protocol == htons(ETH_P_IP) &&
1044               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1045              (skb->protocol == htons(ETH_P_IPV6) &&
1046               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1047             skb_checksum_help(skb)) {
1048 
1049                 netdev_err(netdev, "tx: failed to checksum packet\n");
1050                 netdev->stats.tx_dropped++;
1051                 goto out;
1052         }
1053 
1054         desc_flags = IBMVETH_BUF_VALID;
1055 
1056         if (skb_is_gso(skb) && adapter->fw_large_send_support)
1057                 desc_flags |= IBMVETH_BUF_LRG_SND;
1058 
1059         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1060                 unsigned char *buf = skb_transport_header(skb) +
1061                                                 skb->csum_offset;
1062 
1063                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1064 
1065                 /* Need to zero out the checksum */
1066                 buf[0] = 0;
1067                 buf[1] = 0;
1068         }
1069 
1070 retry_bounce:
1071         memset(descs, 0, sizeof(descs));
1072 
1073         /*
1074          * If a linear packet is below the rx threshold then
1075          * copy it into the static bounce buffer. This avoids the
1076          * cost of a TCE insert and remove.
1077          */
1078         if (force_bounce || (!skb_is_nonlinear(skb) &&
1079                                 (skb->len < tx_copybreak))) {
1080                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1081                                           skb->len);
1082 
1083                 descs[0].fields.flags_len = desc_flags | skb->len;
1084                 descs[0].fields.address = adapter->bounce_buffer_dma;
1085 
1086                 if (ibmveth_send(adapter, descs, 0)) {
1087                         adapter->tx_send_failed++;
1088                         netdev->stats.tx_dropped++;
1089                 } else {
1090                         netdev->stats.tx_packets++;
1091                         netdev->stats.tx_bytes += skb->len;
1092                 }
1093 
1094                 goto out;
1095         }
1096 
1097         /* Map the header */
1098         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1099                                   skb_headlen(skb), DMA_TO_DEVICE);
1100         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1101                 goto map_failed;
1102 
1103         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1104         descs[0].fields.address = dma_addr;
1105 
1106         /* Map the frags */
1107         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1108                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1109 
1110                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1111                                             skb_frag_size(frag), DMA_TO_DEVICE);
1112 
1113                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1114                         goto map_failed_frags;
1115 
1116                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1117                 descs[i+1].fields.address = dma_addr;
1118         }
1119 
1120         if (skb_is_gso(skb)) {
1121                 if (adapter->fw_large_send_support) {
1122                         mss = (unsigned long)skb_shinfo(skb)->gso_size;
1123                         adapter->tx_large_packets++;
1124                 } else if (!skb_is_gso_v6(skb)) {
1125                         /* Put -1 in the IP checksum to tell phyp it
1126                          * is a largesend packet. Put the mss in
1127                          * the TCP checksum.
1128                          */
1129                         ip_hdr(skb)->check = 0xffff;
1130                         tcp_hdr(skb)->check =
1131                                 cpu_to_be16(skb_shinfo(skb)->gso_size);
1132                         adapter->tx_large_packets++;
1133                 }
1134         }
1135 
1136         if (ibmveth_send(adapter, descs, mss)) {
1137                 adapter->tx_send_failed++;
1138                 netdev->stats.tx_dropped++;
1139         } else {
1140                 netdev->stats.tx_packets++;
1141                 netdev->stats.tx_bytes += skb->len;
1142         }
1143 
1144         dma_unmap_single(&adapter->vdev->dev,
1145                          descs[0].fields.address,
1146                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1147                          DMA_TO_DEVICE);
1148 
1149         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1150                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1151                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1152                                DMA_TO_DEVICE);
1153 
1154 out:
1155         dev_consume_skb_any(skb);
1156         return NETDEV_TX_OK;
1157 
1158 map_failed_frags:
1159         last = i+1;
1160         for (i = 0; i < last; i++)
1161                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1162                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1163                                DMA_TO_DEVICE);
1164 
1165 map_failed:
1166         if (!firmware_has_feature(FW_FEATURE_CMO))
1167                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1168         adapter->tx_map_failed++;
1169         if (skb_linearize(skb)) {
1170                 netdev->stats.tx_dropped++;
1171                 goto out;
1172         }
1173         force_bounce = 1;
1174         goto retry_bounce;
1175 }
1176 
1177 static int ibmveth_poll(struct napi_struct *napi, int budget)
1178 {
1179         struct ibmveth_adapter *adapter =
1180                         container_of(napi, struct ibmveth_adapter, napi);
1181         struct net_device *netdev = adapter->netdev;
1182         int frames_processed = 0;
1183         unsigned long lpar_rc;
1184         struct iphdr *iph;
1185 
1186 restart_poll:
1187         while (frames_processed < budget) {
1188                 if (!ibmveth_rxq_pending_buffer(adapter))
1189                         break;
1190 
1191                 smp_rmb();
1192                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1193                         wmb(); /* suggested by larson1 */
1194                         adapter->rx_invalid_buffer++;
1195                         netdev_dbg(netdev, "recycling invalid buffer\n");
1196                         ibmveth_rxq_recycle_buffer(adapter);
1197                 } else {
1198                         struct sk_buff *skb, *new_skb;
1199                         int length = ibmveth_rxq_frame_length(adapter);
1200                         int offset = ibmveth_rxq_frame_offset(adapter);
1201                         int csum_good = ibmveth_rxq_csum_good(adapter);
1202 
1203                         skb = ibmveth_rxq_get_buffer(adapter);
1204 
1205                         new_skb = NULL;
1206                         if (length < rx_copybreak)
1207                                 new_skb = netdev_alloc_skb(netdev, length);
1208 
1209                         if (new_skb) {
1210                                 skb_copy_to_linear_data(new_skb,
1211                                                         skb->data + offset,
1212                                                         length);
1213                                 if (rx_flush)
1214                                         ibmveth_flush_buffer(skb->data,
1215                                                 length + offset);
1216                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1217                                         kfree_skb(skb);
1218                                 skb = new_skb;
1219                         } else {
1220                                 ibmveth_rxq_harvest_buffer(adapter);
1221                                 skb_reserve(skb, offset);
1222                         }
1223 
1224                         skb_put(skb, length);
1225                         skb->protocol = eth_type_trans(skb, netdev);
1226 
1227                         if (csum_good) {
1228                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1229                                 if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
1230                                         iph = (struct iphdr *)skb->data;
1231 
1232                                         /* If the IP checksum is not offloaded and if the packet
1233                                          *  is large send, the checksum must be rebuilt.
1234                                          */
1235                                         if (iph->check == 0xffff) {
1236                                                 iph->check = 0;
1237                                                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
1238                                                 adapter->rx_large_packets++;
1239                                         }
1240                                 }
1241                         }
1242 
1243                         napi_gro_receive(napi, skb);    /* send it up */
1244 
1245                         netdev->stats.rx_packets++;
1246                         netdev->stats.rx_bytes += length;
1247                         frames_processed++;
1248                 }
1249         }
1250 
1251         ibmveth_replenish_task(adapter);
1252 
1253         if (frames_processed < budget) {
1254                 napi_complete(napi);
1255 
1256                 /* We think we are done - reenable interrupts,
1257                  * then check once more to make sure we are done.
1258                  */
1259                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1260                                        VIO_IRQ_ENABLE);
1261 
1262                 BUG_ON(lpar_rc != H_SUCCESS);
1263 
1264                 if (ibmveth_rxq_pending_buffer(adapter) &&
1265                     napi_reschedule(napi)) {
1266                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1267                                                VIO_IRQ_DISABLE);
1268                         goto restart_poll;
1269                 }
1270         }
1271 
1272         return frames_processed;
1273 }
1274 
1275 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1276 {
1277         struct net_device *netdev = dev_instance;
1278         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1279         unsigned long lpar_rc;
1280 
1281         if (napi_schedule_prep(&adapter->napi)) {
1282                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1283                                        VIO_IRQ_DISABLE);
1284                 BUG_ON(lpar_rc != H_SUCCESS);
1285                 __napi_schedule(&adapter->napi);
1286         }
1287         return IRQ_HANDLED;
1288 }
1289 
1290 static void ibmveth_set_multicast_list(struct net_device *netdev)
1291 {
1292         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1293         unsigned long lpar_rc;
1294 
1295         if ((netdev->flags & IFF_PROMISC) ||
1296             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1297                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1298                                            IbmVethMcastEnableRecv |
1299                                            IbmVethMcastDisableFiltering,
1300                                            0);
1301                 if (lpar_rc != H_SUCCESS) {
1302                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1303                                    "entering promisc mode\n", lpar_rc);
1304                 }
1305         } else {
1306                 struct netdev_hw_addr *ha;
1307                 /* clear the filter table & disable filtering */
1308                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1309                                            IbmVethMcastEnableRecv |
1310                                            IbmVethMcastDisableFiltering |
1311                                            IbmVethMcastClearFilterTable,
1312                                            0);
1313                 if (lpar_rc != H_SUCCESS) {
1314                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1315                                    "attempting to clear filter table\n",
1316                                    lpar_rc);
1317                 }
1318                 /* add the addresses to the filter table */
1319                 netdev_for_each_mc_addr(ha, netdev) {
1320                         /* add the multicast address to the filter table */
1321                         u64 mcast_addr;
1322                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1323                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1324                                                    IbmVethMcastAddFilter,
1325                                                    mcast_addr);
1326                         if (lpar_rc != H_SUCCESS) {
1327                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1328                                            "when adding an entry to the filter "
1329                                            "table\n", lpar_rc);
1330                         }
1331                 }
1332 
1333                 /* re-enable filtering */
1334                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1335                                            IbmVethMcastEnableFiltering,
1336                                            0);
1337                 if (lpar_rc != H_SUCCESS) {
1338                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1339                                    "enabling filtering\n", lpar_rc);
1340                 }
1341         }
1342 }
1343 
1344 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1345 {
1346         struct ibmveth_adapter *adapter = netdev_priv(dev);
1347         struct vio_dev *viodev = adapter->vdev;
1348         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1349         int i, rc;
1350         int need_restart = 0;
1351 
1352         if (new_mtu < IBMVETH_MIN_MTU)
1353                 return -EINVAL;
1354 
1355         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1356                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1357                         break;
1358 
1359         if (i == IBMVETH_NUM_BUFF_POOLS)
1360                 return -EINVAL;
1361 
1362         /* Deactivate all the buffer pools so that the next loop can activate
1363            only the buffer pools necessary to hold the new MTU */
1364         if (netif_running(adapter->netdev)) {
1365                 need_restart = 1;
1366                 adapter->pool_config = 1;
1367                 ibmveth_close(adapter->netdev);
1368                 adapter->pool_config = 0;
1369         }
1370 
1371         /* Look for an active buffer pool that can hold the new MTU */
1372         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1373                 adapter->rx_buff_pool[i].active = 1;
1374 
1375                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1376                         dev->mtu = new_mtu;
1377                         vio_cmo_set_dev_desired(viodev,
1378                                                 ibmveth_get_desired_dma
1379                                                 (viodev));
1380                         if (need_restart) {
1381                                 return ibmveth_open(adapter->netdev);
1382                         }
1383                         return 0;
1384                 }
1385         }
1386 
1387         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1388                 return rc;
1389 
1390         return -EINVAL;
1391 }
1392 
1393 #ifdef CONFIG_NET_POLL_CONTROLLER
1394 static void ibmveth_poll_controller(struct net_device *dev)
1395 {
1396         ibmveth_replenish_task(netdev_priv(dev));
1397         ibmveth_interrupt(dev->irq, dev);
1398 }
1399 #endif
1400 
1401 /**
1402  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1403  *
1404  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1405  *
1406  * Return value:
1407  *      Number of bytes of IO data the driver will need to perform well.
1408  */
1409 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1410 {
1411         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1412         struct ibmveth_adapter *adapter;
1413         struct iommu_table *tbl;
1414         unsigned long ret;
1415         int i;
1416         int rxqentries = 1;
1417 
1418         tbl = get_iommu_table_base(&vdev->dev);
1419 
1420         /* netdev inits at probe time along with the structures we need below*/
1421         if (netdev == NULL)
1422                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1423 
1424         adapter = netdev_priv(netdev);
1425 
1426         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1427         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1428 
1429         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1430                 /* add the size of the active receive buffers */
1431                 if (adapter->rx_buff_pool[i].active)
1432                         ret +=
1433                             adapter->rx_buff_pool[i].size *
1434                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1435                                              buff_size, tbl);
1436                 rxqentries += adapter->rx_buff_pool[i].size;
1437         }
1438         /* add the size of the receive queue entries */
1439         ret += IOMMU_PAGE_ALIGN(
1440                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1441 
1442         return ret;
1443 }
1444 
1445 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1446 {
1447         struct ibmveth_adapter *adapter = netdev_priv(dev);
1448         struct sockaddr *addr = p;
1449         u64 mac_address;
1450         int rc;
1451 
1452         if (!is_valid_ether_addr(addr->sa_data))
1453                 return -EADDRNOTAVAIL;
1454 
1455         mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1456         rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1457         if (rc) {
1458                 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1459                 return rc;
1460         }
1461 
1462         ether_addr_copy(dev->dev_addr, addr->sa_data);
1463 
1464         return 0;
1465 }
1466 
1467 static const struct net_device_ops ibmveth_netdev_ops = {
1468         .ndo_open               = ibmveth_open,
1469         .ndo_stop               = ibmveth_close,
1470         .ndo_start_xmit         = ibmveth_start_xmit,
1471         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1472         .ndo_do_ioctl           = ibmveth_ioctl,
1473         .ndo_change_mtu         = ibmveth_change_mtu,
1474         .ndo_fix_features       = ibmveth_fix_features,
1475         .ndo_set_features       = ibmveth_set_features,
1476         .ndo_validate_addr      = eth_validate_addr,
1477         .ndo_set_mac_address    = ibmveth_set_mac_addr,
1478 #ifdef CONFIG_NET_POLL_CONTROLLER
1479         .ndo_poll_controller    = ibmveth_poll_controller,
1480 #endif
1481 };
1482 
1483 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1484 {
1485         int rc, i, mac_len;
1486         struct net_device *netdev;
1487         struct ibmveth_adapter *adapter;
1488         unsigned char *mac_addr_p;
1489         unsigned int *mcastFilterSize_p;
1490         long ret;
1491         unsigned long ret_attr;
1492 
1493         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1494                 dev->unit_address);
1495 
1496         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1497                                                         &mac_len);
1498         if (!mac_addr_p) {
1499                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1500                 return -EINVAL;
1501         }
1502         /* Workaround for old/broken pHyp */
1503         if (mac_len == 8)
1504                 mac_addr_p += 2;
1505         else if (mac_len != 6) {
1506                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1507                         mac_len);
1508                 return -EINVAL;
1509         }
1510 
1511         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1512                                                 VETH_MCAST_FILTER_SIZE, NULL);
1513         if (!mcastFilterSize_p) {
1514                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1515                         "attribute\n");
1516                 return -EINVAL;
1517         }
1518 
1519         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1520 
1521         if (!netdev)
1522                 return -ENOMEM;
1523 
1524         adapter = netdev_priv(netdev);
1525         dev_set_drvdata(&dev->dev, netdev);
1526 
1527         adapter->vdev = dev;
1528         adapter->netdev = netdev;
1529         adapter->mcastFilterSize = *mcastFilterSize_p;
1530         adapter->pool_config = 0;
1531 
1532         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1533 
1534         netdev->irq = dev->irq;
1535         netdev->netdev_ops = &ibmveth_netdev_ops;
1536         netdev->ethtool_ops = &netdev_ethtool_ops;
1537         SET_NETDEV_DEV(netdev, &dev->dev);
1538         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1539                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1540 
1541         netdev->features |= netdev->hw_features;
1542 
1543         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1544 
1545         /* If running older firmware, TSO should not be enabled by default */
1546         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1547             !old_large_send) {
1548                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1549                 netdev->features |= netdev->hw_features;
1550         } else {
1551                 netdev->hw_features |= NETIF_F_TSO;
1552         }
1553 
1554         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1555 
1556         if (firmware_has_feature(FW_FEATURE_CMO))
1557                 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1558 
1559         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1560                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1561                 int error;
1562 
1563                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1564                                          pool_count[i], pool_size[i],
1565                                          pool_active[i]);
1566                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1567                                              &dev->dev.kobj, "pool%d", i);
1568                 if (!error)
1569                         kobject_uevent(kobj, KOBJ_ADD);
1570         }
1571 
1572         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1573 
1574         adapter->buffer_list_dma = DMA_ERROR_CODE;
1575         adapter->filter_list_dma = DMA_ERROR_CODE;
1576         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1577 
1578         netdev_dbg(netdev, "registering netdev...\n");
1579 
1580         ibmveth_set_features(netdev, netdev->features);
1581 
1582         rc = register_netdev(netdev);
1583 
1584         if (rc) {
1585                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1586                 free_netdev(netdev);
1587                 return rc;
1588         }
1589 
1590         netdev_dbg(netdev, "registered\n");
1591 
1592         return 0;
1593 }
1594 
1595 static int ibmveth_remove(struct vio_dev *dev)
1596 {
1597         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1598         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1599         int i;
1600 
1601         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1602                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1603 
1604         unregister_netdev(netdev);
1605 
1606         free_netdev(netdev);
1607         dev_set_drvdata(&dev->dev, NULL);
1608 
1609         return 0;
1610 }
1611 
1612 static struct attribute veth_active_attr;
1613 static struct attribute veth_num_attr;
1614 static struct attribute veth_size_attr;
1615 
1616 static ssize_t veth_pool_show(struct kobject *kobj,
1617                               struct attribute *attr, char *buf)
1618 {
1619         struct ibmveth_buff_pool *pool = container_of(kobj,
1620                                                       struct ibmveth_buff_pool,
1621                                                       kobj);
1622 
1623         if (attr == &veth_active_attr)
1624                 return sprintf(buf, "%d\n", pool->active);
1625         else if (attr == &veth_num_attr)
1626                 return sprintf(buf, "%d\n", pool->size);
1627         else if (attr == &veth_size_attr)
1628                 return sprintf(buf, "%d\n", pool->buff_size);
1629         return 0;
1630 }
1631 
1632 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1633                                const char *buf, size_t count)
1634 {
1635         struct ibmveth_buff_pool *pool = container_of(kobj,
1636                                                       struct ibmveth_buff_pool,
1637                                                       kobj);
1638         struct net_device *netdev = dev_get_drvdata(
1639             container_of(kobj->parent, struct device, kobj));
1640         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1641         long value = simple_strtol(buf, NULL, 10);
1642         long rc;
1643 
1644         if (attr == &veth_active_attr) {
1645                 if (value && !pool->active) {
1646                         if (netif_running(netdev)) {
1647                                 if (ibmveth_alloc_buffer_pool(pool)) {
1648                                         netdev_err(netdev,
1649                                                    "unable to alloc pool\n");
1650                                         return -ENOMEM;
1651                                 }
1652                                 pool->active = 1;
1653                                 adapter->pool_config = 1;
1654                                 ibmveth_close(netdev);
1655                                 adapter->pool_config = 0;
1656                                 if ((rc = ibmveth_open(netdev)))
1657                                         return rc;
1658                         } else {
1659                                 pool->active = 1;
1660                         }
1661                 } else if (!value && pool->active) {
1662                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1663                         int i;
1664                         /* Make sure there is a buffer pool with buffers that
1665                            can hold a packet of the size of the MTU */
1666                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1667                                 if (pool == &adapter->rx_buff_pool[i])
1668                                         continue;
1669                                 if (!adapter->rx_buff_pool[i].active)
1670                                         continue;
1671                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1672                                         break;
1673                         }
1674 
1675                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1676                                 netdev_err(netdev, "no active pool >= MTU\n");
1677                                 return -EPERM;
1678                         }
1679 
1680                         if (netif_running(netdev)) {
1681                                 adapter->pool_config = 1;
1682                                 ibmveth_close(netdev);
1683                                 pool->active = 0;
1684                                 adapter->pool_config = 0;
1685                                 if ((rc = ibmveth_open(netdev)))
1686                                         return rc;
1687                         }
1688                         pool->active = 0;
1689                 }
1690         } else if (attr == &veth_num_attr) {
1691                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1692                         return -EINVAL;
1693                 } else {
1694                         if (netif_running(netdev)) {
1695                                 adapter->pool_config = 1;
1696                                 ibmveth_close(netdev);
1697                                 adapter->pool_config = 0;
1698                                 pool->size = value;
1699                                 if ((rc = ibmveth_open(netdev)))
1700                                         return rc;
1701                         } else {
1702                                 pool->size = value;
1703                         }
1704                 }
1705         } else if (attr == &veth_size_attr) {
1706                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1707                         return -EINVAL;
1708                 } else {
1709                         if (netif_running(netdev)) {
1710                                 adapter->pool_config = 1;
1711                                 ibmveth_close(netdev);
1712                                 adapter->pool_config = 0;
1713                                 pool->buff_size = value;
1714                                 if ((rc = ibmveth_open(netdev)))
1715                                         return rc;
1716                         } else {
1717                                 pool->buff_size = value;
1718                         }
1719                 }
1720         }
1721 
1722         /* kick the interrupt handler to allocate/deallocate pools */
1723         ibmveth_interrupt(netdev->irq, netdev);
1724         return count;
1725 }
1726 
1727 
1728 #define ATTR(_name, _mode)                              \
1729         struct attribute veth_##_name##_attr = {        \
1730         .name = __stringify(_name), .mode = _mode,      \
1731         };
1732 
1733 static ATTR(active, 0644);
1734 static ATTR(num, 0644);
1735 static ATTR(size, 0644);
1736 
1737 static struct attribute *veth_pool_attrs[] = {
1738         &veth_active_attr,
1739         &veth_num_attr,
1740         &veth_size_attr,
1741         NULL,
1742 };
1743 
1744 static const struct sysfs_ops veth_pool_ops = {
1745         .show   = veth_pool_show,
1746         .store  = veth_pool_store,
1747 };
1748 
1749 static struct kobj_type ktype_veth_pool = {
1750         .release        = NULL,
1751         .sysfs_ops      = &veth_pool_ops,
1752         .default_attrs  = veth_pool_attrs,
1753 };
1754 
1755 static int ibmveth_resume(struct device *dev)
1756 {
1757         struct net_device *netdev = dev_get_drvdata(dev);
1758         ibmveth_interrupt(netdev->irq, netdev);
1759         return 0;
1760 }
1761 
1762 static struct vio_device_id ibmveth_device_table[] = {
1763         { "network", "IBM,l-lan"},
1764         { "", "" }
1765 };
1766 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1767 
1768 static struct dev_pm_ops ibmveth_pm_ops = {
1769         .resume = ibmveth_resume
1770 };
1771 
1772 static struct vio_driver ibmveth_driver = {
1773         .id_table       = ibmveth_device_table,
1774         .probe          = ibmveth_probe,
1775         .remove         = ibmveth_remove,
1776         .get_desired_dma = ibmveth_get_desired_dma,
1777         .name           = ibmveth_driver_name,
1778         .pm             = &ibmveth_pm_ops,
1779 };
1780 
1781 static int __init ibmveth_module_init(void)
1782 {
1783         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1784                ibmveth_driver_string, ibmveth_driver_version);
1785 
1786         return vio_register_driver(&ibmveth_driver);
1787 }
1788 
1789 static void __exit ibmveth_module_exit(void)
1790 {
1791         vio_unregister_driver(&ibmveth_driver);
1792 }
1793 
1794 module_init(ibmveth_module_init);
1795 module_exit(ibmveth_module_exit);
1796 

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