Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us