drivers/net/ibmveth.c

   1 /**************************************************************************/
   2 /*                                                                        */
   3 /* IBM eServer i/pSeries Virtual Ethernet Device Driver                   */
   4 /* Copyright (C) 2003 IBM Corp.                                           */
   5 /*  Originally written by Dave Larson (larson1@us.ibm.com)                */
   6 /*  Maintained by Santiago Leon (santil@us.ibm.com)                       */
   7 /*                                                                        */
   8 /*  This program is free software; you can redistribute it and/or modify  */
   9 /*  it under the terms of the GNU General Public License as published by  */
  10 /*  the Free Software Foundation; either version 2 of the License, or     */
  11 /*  (at your option) any later version.                                   */
  12 /*                                                                        */
  13 /*  This program is distributed in the hope that it will be useful,       */
  14 /*  but WITHOUT ANY WARRANTY; without even the implied warranty of        */
  15 /*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         */
  16 /*  GNU General Public License for more details.                          */
  17 /*                                                                        */
  18 /*  You should have received a copy of the GNU General Public License     */
  19 /*  along with this program; if not, write to the Free Software           */
  20 /*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  */
  21 /*                                                                   USA  */
  22 /*                                                                        */
  23 /* This module contains the implementation of a virtual ethernet device   */
  24 /* for use with IBM i/pSeries LPAR Linux.  It utilizes the logical LAN    */
  25 /* option of the RS/6000 Platform Architechture to interface with virtual */
  26 /* ethernet NICs that are presented to the partition by the hypervisor.   */
  27 /*                                                                        */
  28 /**************************************************************************/
  29 /*
  30   TODO:
  31   - remove frag processing code - no longer needed
  32   - add support for sysfs
  33   - possibly remove procfs support
  34 */
  35
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/errno.h>
  39 #include <linux/ioport.h>
  40 #include <linux/dma-mapping.h>
  41 #include <linux/kernel.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/etherdevice.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/init.h>
  46 #include <linux/delay.h>
  47 #include <linux/mm.h>
  48 #include <linux/ethtool.h>
  49 #include <linux/proc_fs.h>
  50 #include <asm/semaphore.h>
  51 #include <asm/hvcall.h>
  52 #include <asm/atomic.h>
  53 #include <asm/iommu.h>
  54 #include <asm/vio.h>
  55 #include <asm/uaccess.h>
  56 #include <linux/seq_file.h>
  57
  58 #include "ibmveth.h"
  59
  60 #undef DEBUG
  61
  62 #define ibmveth_printk(fmt, args...) \
  63   printk(KERN_DEBUG "%s: " fmt, __FILE__, ## args)
  64
  65 #define ibmveth_error_printk(fmt, args...) \
  66   printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
  67
  68 #ifdef DEBUG
  69 #define ibmveth_debug_printk_no_adapter(fmt, args...) \
  70   printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args)
  71 #define ibmveth_debug_printk(fmt, args...) \
  72   printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
  73 #define ibmveth_assert(expr) \
  74   if(!(expr)) {                                   \
  75     printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
  76     BUG(); \
  77   }
  78 #else
  79 #define ibmveth_debug_printk_no_adapter(fmt, args...)
  80 #define ibmveth_debug_printk(fmt, args...)
  81 #define ibmveth_assert(expr)
  82 #endif
  83
  84 static int ibmveth_open(struct net_device *dev);
  85 static int ibmveth_close(struct net_device *dev);
  86 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
  87 static int ibmveth_poll(struct net_device *dev, int *budget);
  88 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev);
  89 static struct net_device_stats *ibmveth_get_stats(struct net_device *dev);
  90 static void ibmveth_set_multicast_list(struct net_device *dev);
  91 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu);
  92 static void ibmveth_proc_register_driver(void);
  93 static void ibmveth_proc_unregister_driver(void);
  94 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
  95 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
  96 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
  97 static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  98 static struct kobj_type ktype_veth_pool;
  99
 100 #ifdef CONFIG_PROC_FS
 101 #define IBMVETH_PROC_DIR "net/ibmveth"
 102 static struct proc_dir_entry *ibmveth_proc_dir;
 103 #endif
 104
 105 static const char ibmveth_driver_name[] = "ibmveth";
 106 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
 107 #define ibmveth_driver_version "1.03"
 108
 109 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
 110 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
 111 MODULE_LICENSE("GPL");
 112 MODULE_VERSION(ibmveth_driver_version);
 113
 114 /* simple methods of getting data from the current rxq entry */
 115 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 116 {
 117         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].toggle == adapter->rx_queue.toggle);
 118 }
 119
 120 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 121 {
 122         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].valid);
 123 }
 124
 125 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 126 {
 127         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].offset);
 128 }
 129
 130 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 131 {
 132         return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 133 }
 134
 135 /* setup the initial settings for a buffer pool */
 136 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
 137 {
 138         pool->size = pool_size;
 139         pool->index = pool_index;
 140         pool->buff_size = buff_size;
 141         pool->threshold = pool_size / 2;
 142         pool->active = pool_active;
 143 }
 144
 145 /* allocate and setup an buffer pool - called during open */
 146 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 147 {
 148         int i;
 149
 150         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 151
 152         if(!pool->free_map) {
 153                 return -1;
 154         }
 155
 156         pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
 157         if(!pool->dma_addr) {
 158                 kfree(pool->free_map);
 159                 pool->free_map = NULL;
 160                 return -1;
 161         }
 162
 163         pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL);
 164
 165         if(!pool->skbuff) {
 166                 kfree(pool->dma_addr);
 167                 pool->dma_addr = NULL;
 168
 169                 kfree(pool->free_map);
 170                 pool->free_map = NULL;
 171                 return -1;
 172         }
 173
 174         memset(pool->skbuff, 0, sizeof(void*) * pool->size);
 175         memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
 176
 177         for(i = 0; i < pool->size; ++i) {
 178                 pool->free_map[i] = i;
 179         }
 180
 181         atomic_set(&pool->available, 0);
 182         pool->producer_index = 0;
 183         pool->consumer_index = 0;
 184
 185         return 0;
 186 }
 187
 188 /* replenish the buffers for a pool.  note that we don't need to
 189  * skb_reserve these since they are used for incoming...
 190  */
 191 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
 192 {
 193         u32 i;
 194         u32 count = pool->size - atomic_read(&pool->available);
 195         u32 buffers_added = 0;
 196
 197         mb();
 198
 199         for(i = 0; i < count; ++i) {
 200                 struct sk_buff *skb;
 201                 unsigned int free_index, index;
 202                 u64 correlator;
 203                 union ibmveth_buf_desc desc;
 204                 unsigned long lpar_rc;
 205                 dma_addr_t dma_addr;
 206
 207                 skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
 208
 209                 if(!skb) {
 210                         ibmveth_debug_printk("replenish: unable to allocate skb\n");
 211                         adapter->replenish_no_mem++;
 212                         break;
 213                 }
 214
 215                 free_index = pool->consumer_index++ % pool->size;
 216                 index = pool->free_map[free_index];
 217
 218                 ibmveth_assert(index != IBM_VETH_INVALID_MAP);
 219                 ibmveth_assert(pool->skbuff[index] == NULL);
 220
 221                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 222                                 pool->buff_size, DMA_FROM_DEVICE);
 223
 224                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 225                 pool->dma_addr[index] = dma_addr;
 226                 pool->skbuff[index] = skb;
 227
 228                 correlator = ((u64)pool->index << 32) | index;
 229                 *(u64*)skb->data = correlator;
 230
 231                 desc.desc = 0;
 232                 desc.fields.valid = 1;
 233                 desc.fields.length = pool->buff_size;
 234                 desc.fields.address = dma_addr;
 235
 236                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 237
 238                 if(lpar_rc != H_SUCCESS) {
 239                         pool->free_map[free_index] = index;
 240                         pool->skbuff[index] = NULL;
 241                         pool->consumer_index--;
 242                         dma_unmap_single(&adapter->vdev->dev,
 243                                         pool->dma_addr[index], pool->buff_size,
 244                                         DMA_FROM_DEVICE);
 245                         dev_kfree_skb_any(skb);
 246                         adapter->replenish_add_buff_failure++;
 247                         break;
 248                 } else {
 249                         buffers_added++;
 250                         adapter->replenish_add_buff_success++;
 251                 }
 252         }
 253
 254         mb();
 255         atomic_add(buffers_added, &(pool->available));
 256 }
 257
 258 /* replenish routine */
 259 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 260 {
 261         int i;
 262
 263         adapter->replenish_task_cycles++;
 264
 265         for(i = 0; i < IbmVethNumBufferPools; i++)
 266                 if(adapter->rx_buff_pool[i].active)
 267                         ibmveth_replenish_buffer_pool(adapter,
 268                                                      &adapter->rx_buff_pool[i]);
 269
 270         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
 271 }
 272
 273 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 274 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
 275 {
 276         int i;
 277
 278         kfree(pool->free_map);
 279         pool->free_map = NULL;
 280
 281         if(pool->skbuff && pool->dma_addr) {
 282                 for(i = 0; i < pool->size; ++i) {
 283                         struct sk_buff *skb = pool->skbuff[i];
 284                         if(skb) {
 285                                 dma_unmap_single(&adapter->vdev->dev,
 286                                                  pool->dma_addr[i],
 287                                                  pool->buff_size,
 288                                                  DMA_FROM_DEVICE);
 289                                 dev_kfree_skb_any(skb);
 290                                 pool->skbuff[i] = NULL;
 291                         }
 292                 }
 293         }
 294
 295         if(pool->dma_addr) {
 296                 kfree(pool->dma_addr);
 297                 pool->dma_addr = NULL;
 298         }
 299
 300         if(pool->skbuff) {
 301                 kfree(pool->skbuff);
 302                 pool->skbuff = NULL;
 303         }
 304 }
 305
 306 /* remove a buffer from a pool */
 307 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator)
 308 {
 309         unsigned int pool  = correlator >> 32;
 310         unsigned int index = correlator & 0xffffffffUL;
 311         unsigned int free_index;
 312         struct sk_buff *skb;
 313
 314         ibmveth_assert(pool < IbmVethNumBufferPools);
 315         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 316
 317         skb = adapter->rx_buff_pool[pool].skbuff[index];
 318
 319         ibmveth_assert(skb != NULL);
 320
 321         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 322
 323         dma_unmap_single(&adapter->vdev->dev,
 324                          adapter->rx_buff_pool[pool].dma_addr[index],
 325                          adapter->rx_buff_pool[pool].buff_size,
 326                          DMA_FROM_DEVICE);
 327
 328         free_index = adapter->rx_buff_pool[pool].producer_index++ % adapter->rx_buff_pool[pool].size;
 329         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 330
 331         mb();
 332
 333         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 334 }
 335
 336 /* get the current buffer on the rx queue */
 337 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 338 {
 339         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 340         unsigned int pool = correlator >> 32;
 341         unsigned int index = correlator & 0xffffffffUL;
 342
 343         ibmveth_assert(pool < IbmVethNumBufferPools);
 344         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 345
 346         return adapter->rx_buff_pool[pool].skbuff[index];
 347 }
 348
 349 /* recycle the current buffer on the rx queue */
 350 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 351 {
 352         u32 q_index = adapter->rx_queue.index;
 353         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 354         unsigned int pool = correlator >> 32;
 355         unsigned int index = correlator & 0xffffffffUL;
 356         union ibmveth_buf_desc desc;
 357         unsigned long lpar_rc;
 358
 359         ibmveth_assert(pool < IbmVethNumBufferPools);
 360         ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
 361
 362         if(!adapter->rx_buff_pool[pool].active) {
 363                 ibmveth_rxq_harvest_buffer(adapter);
 364                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 365                 return;
 366         }
 367
 368         desc.desc = 0;
 369         desc.fields.valid = 1;
 370         desc.fields.length = adapter->rx_buff_pool[pool].buff_size;
 371         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 372
 373         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 374
 375         if(lpar_rc != H_SUCCESS) {
 376                 ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
 377                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 378         }
 379
 380         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 381                 adapter->rx_queue.index = 0;
 382                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 383         }
 384 }
 385
 386 static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 387 {
 388         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 389
 390         if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 391                 adapter->rx_queue.index = 0;
 392                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 393         }
 394 }
 395
 396 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 397 {
 398         int i;
 399
 400         if(adapter->buffer_list_addr != NULL) {
 401                 if(!dma_mapping_error(adapter->buffer_list_dma)) {
 402                         dma_unmap_single(&adapter->vdev->dev,
 403                                         adapter->buffer_list_dma, 4096,
 404                                         DMA_BIDIRECTIONAL);
 405                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 406                 }
 407                 free_page((unsigned long)adapter->buffer_list_addr);
 408                 adapter->buffer_list_addr = NULL;
 409         }
 410
 411         if(adapter->filter_list_addr != NULL) {
 412                 if(!dma_mapping_error(adapter->filter_list_dma)) {
 413                         dma_unmap_single(&adapter->vdev->dev,
 414                                         adapter->filter_list_dma, 4096,
 415                                         DMA_BIDIRECTIONAL);
 416                         adapter->filter_list_dma = DMA_ERROR_CODE;
 417                 }
 418                 free_page((unsigned long)adapter->filter_list_addr);
 419                 adapter->filter_list_addr = NULL;
 420         }
 421
 422         if(adapter->rx_queue.queue_addr != NULL) {
 423                 if(!dma_mapping_error(adapter->rx_queue.queue_dma)) {
 424                         dma_unmap_single(&adapter->vdev->dev,
 425                                         adapter->rx_queue.queue_dma,
 426                                         adapter->rx_queue.queue_len,
 427                                         DMA_BIDIRECTIONAL);
 428                         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
 429                 }
 430                 kfree(adapter->rx_queue.queue_addr);
 431                 adapter->rx_queue.queue_addr = NULL;
 432         }
 433
 434         for(i = 0; i<IbmVethNumBufferPools; i++)
 435                 if (adapter->rx_buff_pool[i].active)
 436                         ibmveth_free_buffer_pool(adapter,
 437                                                  &adapter->rx_buff_pool[i]);
 438 }
 439
 440 static int ibmveth_open(struct net_device *netdev)
 441 {
 442         struct ibmveth_adapter *adapter = netdev->priv;
 443         u64 mac_address = 0;
 444         int rxq_entries = 1;
 445         unsigned long lpar_rc;
 446         int rc;
 447         union ibmveth_buf_desc rxq_desc;
 448         int i;
 449
 450         ibmveth_debug_printk("open starting\n");
 451
 452         for(i = 0; i<IbmVethNumBufferPools; i++)
 453                 rxq_entries += adapter->rx_buff_pool[i].size;
 454
 455         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 456         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 457
 458         if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 459                 ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
 460                 ibmveth_cleanup(adapter);
 461                 return -ENOMEM;
 462         }
 463
 464         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
 465         adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
 466
 467         if(!adapter->rx_queue.queue_addr) {
 468                 ibmveth_error_printk("unable to allocate rx queue pages\n");
 469                 ibmveth_cleanup(adapter);
 470                 return -ENOMEM;
 471         }
 472
 473         adapter->buffer_list_dma = dma_map_single(&adapter->vdev->dev,
 474                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 475         adapter->filter_list_dma = dma_map_single(&adapter->vdev->dev,
 476                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 477         adapter->rx_queue.queue_dma = dma_map_single(&adapter->vdev->dev,
 478                         adapter->rx_queue.queue_addr,
 479                         adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
 480
 481         if((dma_mapping_error(adapter->buffer_list_dma) ) ||
 482            (dma_mapping_error(adapter->filter_list_dma)) ||
 483            (dma_mapping_error(adapter->rx_queue.queue_dma))) {
 484                 ibmveth_error_printk("unable to map filter or buffer list pages\n");
 485                 ibmveth_cleanup(adapter);
 486                 return -ENOMEM;
 487         }
 488
 489         adapter->rx_queue.index = 0;
 490         adapter->rx_queue.num_slots = rxq_entries;
 491         adapter->rx_queue.toggle = 1;
 492
 493         memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
 494         mac_address = mac_address >> 16;
 495
 496         rxq_desc.desc = 0;
 497         rxq_desc.fields.valid = 1;
 498         rxq_desc.fields.length = adapter->rx_queue.queue_len;
 499         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 500
 501         ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr);
 502         ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
 503         ibmveth_debug_printk("receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 504
 505
 506         lpar_rc = h_register_logical_lan(adapter->vdev->unit_address,
 507                                          adapter->buffer_list_dma,
 508                                          rxq_desc.desc,
 509                                          adapter->filter_list_dma,
 510                                          mac_address);
 511
 512         if(lpar_rc != H_SUCCESS) {
 513                 ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc);
 514                 ibmveth_error_printk("buffer TCE:0x%lx filter TCE:0x%lx rxq desc:0x%lx MAC:0x%lx\n",
 515                                      adapter->buffer_list_dma,
 516                                      adapter->filter_list_dma,
 517                                      rxq_desc.desc,
 518                                      mac_address);
 519                 ibmveth_cleanup(adapter);
 520                 return -ENONET;
 521         }
 522
 523         for(i = 0; i<IbmVethNumBufferPools; i++) {
 524                 if(!adapter->rx_buff_pool[i].active)
 525                         continue;
 526                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 527                         ibmveth_error_printk("unable to alloc pool\n");
 528                         adapter->rx_buff_pool[i].active = 0;
 529                         ibmveth_cleanup(adapter);
 530                         return -ENOMEM ;
 531                 }
 532         }
 533
 534         ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
 535         if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
 536                 ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc);
 537                 do {
 538                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 539                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 540
 541                 ibmveth_cleanup(adapter);
 542                 return rc;
 543         }
 544
 545         ibmveth_debug_printk("initial replenish cycle\n");
 546         ibmveth_interrupt(netdev->irq, netdev, NULL);
 547
 548         netif_start_queue(netdev);
 549
 550         ibmveth_debug_printk("open complete\n");
 551
 552         return 0;
 553 }
 554
 555 static int ibmveth_close(struct net_device *netdev)
 556 {
 557         struct ibmveth_adapter *adapter = netdev->priv;
 558         long lpar_rc;
 559
 560         ibmveth_debug_printk("close starting\n");
 561
 562         if (!adapter->pool_config)
 563                 netif_stop_queue(netdev);
 564
 565         free_irq(netdev->irq, netdev);
 566
 567         do {
 568                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 569         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 570
 571         if(lpar_rc != H_SUCCESS)
 572         {
 573                 ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n",
 574                                      lpar_rc);
 575         }
 576
 577         adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
 578
 579         ibmveth_cleanup(adapter);
 580
 581         ibmveth_debug_printk("close complete\n");
 582
 583         return 0;
 584 }
 585
 586 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
 587         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
 588         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
 589         cmd->speed = SPEED_1000;
 590         cmd->duplex = DUPLEX_FULL;
 591         cmd->port = PORT_FIBRE;
 592         cmd->phy_address = 0;
 593         cmd->transceiver = XCVR_INTERNAL;
 594         cmd->autoneg = AUTONEG_ENABLE;
 595         cmd->maxtxpkt = 0;
 596         cmd->maxrxpkt = 1;
 597         return 0;
 598 }
 599
 600 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
 601         strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
 602         strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
 603 }
 604
 605 static u32 netdev_get_link(struct net_device *dev) {
 606         return 1;
 607 }
 608
 609 static const struct ethtool_ops netdev_ethtool_ops = {
 610         .get_drvinfo            = netdev_get_drvinfo,
 611         .get_settings           = netdev_get_settings,
 612         .get_link               = netdev_get_link,
 613         .get_sg                 = ethtool_op_get_sg,
 614         .get_tx_csum            = ethtool_op_get_tx_csum,
 615 };
 616
 617 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 618 {
 619         return -EOPNOTSUPP;
 620 }
 621
 622 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 623
 624 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 625 {
 626         struct ibmveth_adapter *adapter = netdev->priv;
 627         union ibmveth_buf_desc desc[IbmVethMaxSendFrags];
 628         unsigned long lpar_rc;
 629         int nfrags = 0, curfrag;
 630         unsigned long correlator;
 631         unsigned long flags;
 632         unsigned int retry_count;
 633         unsigned int tx_dropped = 0;
 634         unsigned int tx_bytes = 0;
 635         unsigned int tx_packets = 0;
 636         unsigned int tx_send_failed = 0;
 637         unsigned int tx_map_failed = 0;
 638
 639
 640         if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) {
 641                 tx_dropped++;
 642                 goto out;
 643         }
 644
 645         memset(&desc, 0, sizeof(desc));
 646
 647         /* nfrags = number of frags after the initial fragment */
 648         nfrags = skb_shinfo(skb)->nr_frags;
 649
 650         if(nfrags)
 651                 adapter->tx_multidesc_send++;
 652
 653         /* map the initial fragment */
 654         desc[0].fields.length  = nfrags ? skb->len - skb->data_len : skb->len;
 655         desc[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
 656                                         desc[0].fields.length, DMA_TO_DEVICE);
 657         desc[0].fields.valid   = 1;
 658
 659         if(dma_mapping_error(desc[0].fields.address)) {
 660                 ibmveth_error_printk("tx: unable to map initial fragment\n");
 661                 tx_map_failed++;
 662                 tx_dropped++;
 663                 goto out;
 664         }
 665
 666         curfrag = nfrags;
 667
 668         /* map fragments past the initial portion if there are any */
 669         while(curfrag--) {
 670                 skb_frag_t *frag = &skb_shinfo(skb)->frags[curfrag];
 671                 desc[curfrag+1].fields.address
 672                         = dma_map_single(&adapter->vdev->dev,
 673                                 page_address(frag->page) + frag->page_offset,
 674                                 frag->size, DMA_TO_DEVICE);
 675                 desc[curfrag+1].fields.length = frag->size;
 676                 desc[curfrag+1].fields.valid  = 1;
 677
 678                 if(dma_mapping_error(desc[curfrag+1].fields.address)) {
 679                         ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag);
 680                         tx_map_failed++;
 681                         tx_dropped++;
 682                         /* Free all the mappings we just created */
 683                         while(curfrag < nfrags) {
 684                                 dma_unmap_single(&adapter->vdev->dev,
 685                                                  desc[curfrag+1].fields.address,
 686                                                  desc[curfrag+1].fields.length,
 687                                                  DMA_TO_DEVICE);
 688                                 curfrag++;
 689                         }
 690                         goto out;
 691                 }
 692         }
 693
 694         /* send the frame. Arbitrarily set retrycount to 1024 */
 695         correlator = 0;
 696         retry_count = 1024;
 697         do {
 698                 lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
 699                                              desc[0].desc,
 700                                              desc[1].desc,
 701                                              desc[2].desc,
 702                                              desc[3].desc,
 703                                              desc[4].desc,
 704                                              desc[5].desc,
 705                                              correlator,
 706                                              &correlator);
 707         } while ((lpar_rc == H_BUSY) && (retry_count--));
 708
 709         if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
 710                 int i;
 711                 ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
 712                 for(i = 0; i < 6; i++) {
 713                         ibmveth_error_printk("tx: desc[%i] valid=%d, len=%d, address=0x%d\n", i,
 714                                              desc[i].fields.valid, desc[i].fields.length, desc[i].fields.address);
 715                 }
 716                 tx_send_failed++;
 717                 tx_dropped++;
 718         } else {
 719                 tx_packets++;
 720                 tx_bytes += skb->len;
 721                 netdev->trans_start = jiffies;
 722         }
 723
 724         do {
 725                 dma_unmap_single(&adapter->vdev->dev,
 726                                 desc[nfrags].fields.address,
 727                                 desc[nfrags].fields.length, DMA_TO_DEVICE);
 728         } while(--nfrags >= 0);
 729
 730 out:    spin_lock_irqsave(&adapter->stats_lock, flags);
 731         adapter->stats.tx_dropped += tx_dropped;
 732         adapter->stats.tx_bytes += tx_bytes;
 733         adapter->stats.tx_packets += tx_packets;
 734         adapter->tx_send_failed += tx_send_failed;
 735         adapter->tx_map_failed += tx_map_failed;
 736         spin_unlock_irqrestore(&adapter->stats_lock, flags);
 737
 738         dev_kfree_skb(skb);
 739         return 0;
 740 }
 741
 742 static int ibmveth_poll(struct net_device *netdev, int *budget)
 743 {
 744         struct ibmveth_adapter *adapter = netdev->priv;
 745         int max_frames_to_process = netdev->quota;
 746         int frames_processed = 0;
 747         int more_work = 1;
 748         unsigned long lpar_rc;
 749
 750  restart_poll:
 751         do {
 752                 struct net_device *netdev = adapter->netdev;
 753
 754                 if(ibmveth_rxq_pending_buffer(adapter)) {
 755                         struct sk_buff *skb;
 756
 757                         rmb();
 758
 759                         if(!ibmveth_rxq_buffer_valid(adapter)) {
 760                                 wmb(); /* suggested by larson1 */
 761                                 adapter->rx_invalid_buffer++;
 762                                 ibmveth_debug_printk("recycling invalid buffer\n");
 763                                 ibmveth_rxq_recycle_buffer(adapter);
 764                         } else {
 765                                 int length = ibmveth_rxq_frame_length(adapter);
 766                                 int offset = ibmveth_rxq_frame_offset(adapter);
 767                                 skb = ibmveth_rxq_get_buffer(adapter);
 768
 769                                 ibmveth_rxq_harvest_buffer(adapter);
 770
 771                                 skb_reserve(skb, offset);
 772                                 skb_put(skb, length);
 773                                 skb->dev = netdev;
 774                                 skb->protocol = eth_type_trans(skb, netdev);
 775
 776                                 netif_receive_skb(skb); /* send it up */
 777
 778                                 adapter->stats.rx_packets++;
 779                                 adapter->stats.rx_bytes += length;
 780                                 frames_processed++;
 781                                 netdev->last_rx = jiffies;
 782                         }
 783                 } else {
 784                         more_work = 0;
 785                 }
 786         } while(more_work && (frames_processed < max_frames_to_process));
 787
 788         ibmveth_replenish_task(adapter);
 789
 790         if(more_work) {
 791                 /* more work to do - return that we are not done yet */
 792                 netdev->quota -= frames_processed;
 793                 *budget -= frames_processed;
 794                 return 1;
 795         }
 796
 797         /* we think we are done - reenable interrupts, then check once more to make sure we are done */
 798         lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_ENABLE);
 799
 800         ibmveth_assert(lpar_rc == H_SUCCESS);
 801
 802         netif_rx_complete(netdev);
 803
 804         if(ibmveth_rxq_pending_buffer(adapter) && netif_rx_reschedule(netdev, frames_processed))
 805         {
 806                 lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 807                 ibmveth_assert(lpar_rc == H_SUCCESS);
 808                 more_work = 1;
 809                 goto restart_poll;
 810         }
 811
 812         netdev->quota -= frames_processed;
 813         *budget -= frames_processed;
 814
 815         /* we really are done */
 816         return 0;
 817 }
 818
 819 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
 820 {
 821         struct net_device *netdev = dev_instance;
 822         struct ibmveth_adapter *adapter = netdev->priv;
 823         unsigned long lpar_rc;
 824
 825         if(netif_rx_schedule_prep(netdev)) {
 826                 lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 827                 ibmveth_assert(lpar_rc == H_SUCCESS);
 828                 __netif_rx_schedule(netdev);
 829         }
 830         return IRQ_HANDLED;
 831 }
 832
 833 static struct net_device_stats *ibmveth_get_stats(struct net_device *dev)
 834 {
 835         struct ibmveth_adapter *adapter = dev->priv;
 836         return &adapter->stats;
 837 }
 838
 839 static void ibmveth_set_multicast_list(struct net_device *netdev)
 840 {
 841         struct ibmveth_adapter *adapter = netdev->priv;
 842         unsigned long lpar_rc;
 843
 844         if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) {
 845                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
 846                                            IbmVethMcastEnableRecv |
 847                                            IbmVethMcastDisableFiltering,
 848                                            0);
 849                 if(lpar_rc != H_SUCCESS) {
 850                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc);
 851                 }
 852         } else {
 853                 struct dev_mc_list *mclist = netdev->mc_list;
 854                 int i;
 855                 /* clear the filter table & disable filtering */
 856                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
 857                                            IbmVethMcastEnableRecv |
 858                                            IbmVethMcastDisableFiltering |
 859                                            IbmVethMcastClearFilterTable,
 860                                            0);
 861                 if(lpar_rc != H_SUCCESS) {
 862                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc);
 863                 }
 864                 /* add the addresses to the filter table */
 865                 for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) {
 866                         // add the multicast address to the filter table
 867                         unsigned long mcast_addr = 0;
 868                         memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6);
 869                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
 870                                                    IbmVethMcastAddFilter,
 871                                                    mcast_addr);
 872                         if(lpar_rc != H_SUCCESS) {
 873                                 ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
 874                         }
 875                 }
 876
 877                 /* re-enable filtering */
 878                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
 879                                            IbmVethMcastEnableFiltering,
 880                                            0);
 881                 if(lpar_rc != H_SUCCESS) {
 882                         ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc);
 883                 }
 884         }
 885 }
 886
 887 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
 888 {
 889         struct ibmveth_adapter *adapter = dev->priv;
 890         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
 891         int i;
 892
 893         if (new_mtu < IBMVETH_MAX_MTU)
 894                 return -EINVAL;
 895
 896         /* Look for an active buffer pool that can hold the new MTU */
 897         for(i = 0; i<IbmVethNumBufferPools; i++) {
 898                 if (!adapter->rx_buff_pool[i].active)
 899                         continue;
 900                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
 901                         dev->mtu = new_mtu;
 902                         return 0;
 903                 }
 904         }
 905         return -EINVAL;
 906 }
 907
 908 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 909 {
 910         int rc, i;
 911         struct net_device *netdev;
 912         struct ibmveth_adapter *adapter = NULL;
 913
 914         unsigned char *mac_addr_p;
 915         unsigned int *mcastFilterSize_p;
 916
 917
 918         ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n",
 919                                         dev->unit_address);
 920
 921         mac_addr_p = (unsigned char *) vio_get_attribute(dev, VETH_MAC_ADDR, 0);
 922         if(!mac_addr_p) {
 923                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR "
 924                                 "attribute\n", __FILE__, __LINE__);
 925                 return 0;
 926         }
 927
 928         mcastFilterSize_p= (unsigned int *) vio_get_attribute(dev, VETH_MCAST_FILTER_SIZE, 0);
 929         if(!mcastFilterSize_p) {
 930                 printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
 931                                 "VETH_MCAST_FILTER_SIZE attribute\n",
 932                                 __FILE__, __LINE__);
 933                 return 0;
 934         }
 935
 936         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
 937
 938         if(!netdev)
 939                 return -ENOMEM;
 940
 941         SET_MODULE_OWNER(netdev);
 942
 943         adapter = netdev->priv;
 944         memset(adapter, 0, sizeof(adapter));
 945         dev->dev.driver_data = netdev;
 946
 947         adapter->vdev = dev;
 948         adapter->netdev = netdev;
 949         adapter->mcastFilterSize= *mcastFilterSize_p;
 950         adapter->pool_config = 0;
 951
 952         /*      Some older boxes running PHYP non-natively have an OF that
 953                 returns a 8-byte local-mac-address field (and the first
 954                 2 bytes have to be ignored) while newer boxes' OF return
 955                 a 6-byte field. Note that IEEE 1275 specifies that
 956                 local-mac-address must be a 6-byte field.
 957                 The RPA doc specifies that the first byte must be 10b, so
 958                 we'll just look for it to solve this 8 vs. 6 byte field issue */
 959
 960         if ((*mac_addr_p & 0x3) != 0x02)
 961                 mac_addr_p += 2;
 962
 963         adapter->mac_addr = 0;
 964         memcpy(&adapter->mac_addr, mac_addr_p, 6);
 965
 966         adapter->liobn = dev->iommu_table->it_index;
 967
 968         netdev->irq = dev->irq;
 969         netdev->open               = ibmveth_open;
 970         netdev->poll               = ibmveth_poll;
 971         netdev->weight             = 16;
 972         netdev->stop               = ibmveth_close;
 973         netdev->hard_start_xmit    = ibmveth_start_xmit;
 974         netdev->get_stats          = ibmveth_get_stats;
 975         netdev->set_multicast_list = ibmveth_set_multicast_list;
 976         netdev->do_ioctl           = ibmveth_ioctl;
 977         netdev->ethtool_ops           = &netdev_ethtool_ops;
 978         netdev->change_mtu         = ibmveth_change_mtu;
 979         SET_NETDEV_DEV(netdev, &dev->dev);
 980         netdev->features |= NETIF_F_LLTX;
 981         spin_lock_init(&adapter->stats_lock);
 982
 983         memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
 984
 985         for(i = 0; i<IbmVethNumBufferPools; i++) {
 986                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
 987                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
 988                                          pool_count[i], pool_size[i],
 989                                          pool_active[i]);
 990                 kobj->parent = &dev->dev.kobj;
 991                 sprintf(kobj->name, "pool%d", i);
 992                 kobj->ktype = &ktype_veth_pool;
 993                 kobject_register(kobj);
 994         }
 995
 996         ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
 997
 998         adapter->buffer_list_dma = DMA_ERROR_CODE;
 999         adapter->filter_list_dma = DMA_ERROR_CODE;
1000         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1001
1002         ibmveth_debug_printk("registering netdev...\n");
1003
1004         rc = register_netdev(netdev);
1005
1006         if(rc) {
1007                 ibmveth_debug_printk("failed to register netdev rc=%d\n", rc);
1008                 free_netdev(netdev);
1009                 return rc;
1010         }
1011
1012         ibmveth_debug_printk("registered\n");
1013
1014         ibmveth_proc_register_adapter(adapter);
1015
1016         return 0;
1017 }
1018
1019 static int __devexit ibmveth_remove(struct vio_dev *dev)
1020 {
1021         struct net_device *netdev = dev->dev.driver_data;
1022         struct ibmveth_adapter *adapter = netdev->priv;
1023         int i;
1024
1025         for(i = 0; i<IbmVethNumBufferPools; i++)
1026                 kobject_unregister(&adapter->rx_buff_pool[i].kobj);
1027
1028         unregister_netdev(netdev);
1029
1030         ibmveth_proc_unregister_adapter(adapter);
1031
1032         free_netdev(netdev);
1033         return 0;
1034 }
1035
1036 #ifdef CONFIG_PROC_FS
1037 static void ibmveth_proc_register_driver(void)
1038 {
1039         ibmveth_proc_dir = proc_mkdir(IBMVETH_PROC_DIR, NULL);
1040         if (ibmveth_proc_dir) {
1041                 SET_MODULE_OWNER(ibmveth_proc_dir);
1042         }
1043 }
1044
1045 static void ibmveth_proc_unregister_driver(void)
1046 {
1047         remove_proc_entry(IBMVETH_PROC_DIR, NULL);
1048 }
1049
1050 static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos)
1051 {
1052         if (*pos == 0) {
1053                 return (void *)1;
1054         } else {
1055                 return NULL;
1056         }
1057 }
1058
1059 static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1060 {
1061         ++*pos;
1062         return NULL;
1063 }
1064
1065 static void ibmveth_seq_stop(struct seq_file *seq, void *v)
1066 {
1067 }
1068
1069 static int ibmveth_seq_show(struct seq_file *seq, void *v)
1070 {
1071         struct ibmveth_adapter *adapter = seq->private;
1072         char *current_mac = ((char*) &adapter->netdev->dev_addr);
1073         char *firmware_mac = ((char*) &adapter->mac_addr) ;
1074
1075         seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
1076
1077         seq_printf(seq, "Unit Address:    0x%x\n", adapter->vdev->unit_address);
1078         seq_printf(seq, "LIOBN:           0x%lx\n", adapter->liobn);
1079         seq_printf(seq, "Current MAC:     %02X:%02X:%02X:%02X:%02X:%02X\n",
1080                    current_mac[0], current_mac[1], current_mac[2],
1081                    current_mac[3], current_mac[4], current_mac[5]);
1082         seq_printf(seq, "Firmware MAC:    %02X:%02X:%02X:%02X:%02X:%02X\n",
1083                    firmware_mac[0], firmware_mac[1], firmware_mac[2],
1084                    firmware_mac[3], firmware_mac[4], firmware_mac[5]);
1085
1086         seq_printf(seq, "\nAdapter Statistics:\n");
1087         seq_printf(seq, "  TX:  skbuffs linearized:          %ld\n", adapter->tx_linearized);
1088         seq_printf(seq, "       multi-descriptor sends:      %ld\n", adapter->tx_multidesc_send);
1089         seq_printf(seq, "       skb_linearize failures:      %ld\n", adapter->tx_linearize_failed);
1090         seq_printf(seq, "       vio_map_single failres:      %ld\n", adapter->tx_map_failed);
1091         seq_printf(seq, "       send failures:               %ld\n", adapter->tx_send_failed);
1092         seq_printf(seq, "  RX:  replenish task cycles:       %ld\n", adapter->replenish_task_cycles);
1093         seq_printf(seq, "       alloc_skb_failures:          %ld\n", adapter->replenish_no_mem);
1094         seq_printf(seq, "       add buffer failures:         %ld\n", adapter->replenish_add_buff_failure);
1095         seq_printf(seq, "       invalid buffers:             %ld\n", adapter->rx_invalid_buffer);
1096         seq_printf(seq, "       no buffers:                  %ld\n", adapter->rx_no_buffer);
1097
1098         return 0;
1099 }
1100 static struct seq_operations ibmveth_seq_ops = {
1101         .start = ibmveth_seq_start,
1102         .next  = ibmveth_seq_next,
1103         .stop  = ibmveth_seq_stop,
1104         .show  = ibmveth_seq_show,
1105 };
1106
1107 static int ibmveth_proc_open(struct inode *inode, struct file *file)
1108 {
1109         struct seq_file *seq;
1110         struct proc_dir_entry *proc;
1111         int rc;
1112
1113         rc = seq_open(file, &ibmveth_seq_ops);
1114         if (!rc) {
1115                 /* recover the pointer buried in proc_dir_entry data */
1116                 seq = file->private_data;
1117                 proc = PDE(inode);
1118                 seq->private = proc->data;
1119         }
1120         return rc;
1121 }
1122
1123 static struct file_operations ibmveth_proc_fops = {
1124         .owner   = THIS_MODULE,
1125         .open    = ibmveth_proc_open,
1126         .read    = seq_read,
1127         .llseek  = seq_lseek,
1128         .release = seq_release,
1129 };
1130
1131 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1132 {
1133         struct proc_dir_entry *entry;
1134         if (ibmveth_proc_dir) {
1135                 entry = create_proc_entry(adapter->netdev->name, S_IFREG, ibmveth_proc_dir);
1136                 if (!entry) {
1137                         ibmveth_error_printk("Cannot create adapter proc entry");
1138                 } else {
1139                         entry->data = (void *) adapter;
1140                         entry->proc_fops = &ibmveth_proc_fops;
1141                         SET_MODULE_OWNER(entry);
1142                 }
1143         }
1144         return;
1145 }
1146
1147 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1148 {
1149         if (ibmveth_proc_dir) {
1150                 remove_proc_entry(adapter->netdev->name, ibmveth_proc_dir);
1151         }
1152 }
1153
1154 #else /* CONFIG_PROC_FS */
1155 static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
1156 {
1157 }
1158
1159 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
1160 {
1161 }
1162 static void ibmveth_proc_register_driver(void)
1163 {
1164 }
1165
1166 static void ibmveth_proc_unregister_driver(void)
1167 {
1168 }
1169 #endif /* CONFIG_PROC_FS */
1170
1171 static struct attribute veth_active_attr;
1172 static struct attribute veth_num_attr;
1173 static struct attribute veth_size_attr;
1174
1175 static ssize_t veth_pool_show(struct kobject * kobj,
1176                               struct attribute * attr, char * buf)
1177 {
1178         struct ibmveth_buff_pool *pool = container_of(kobj,
1179                                                       struct ibmveth_buff_pool,
1180                                                       kobj);
1181
1182         if (attr == &veth_active_attr)
1183                 return sprintf(buf, "%d\n", pool->active);
1184         else if (attr == &veth_num_attr)
1185                 return sprintf(buf, "%d\n", pool->size);
1186         else if (attr == &veth_size_attr)
1187                 return sprintf(buf, "%d\n", pool->buff_size);
1188         return 0;
1189 }
1190
1191 static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
1192 const char * buf, size_t count)
1193 {
1194         struct ibmveth_buff_pool *pool = container_of(kobj,
1195                                                       struct ibmveth_buff_pool,
1196                                                       kobj);
1197         struct net_device *netdev =
1198             container_of(kobj->parent, struct device, kobj)->driver_data;
1199         struct ibmveth_adapter *adapter = netdev->priv;
1200         long value = simple_strtol(buf, NULL, 10);
1201         long rc;
1202
1203         if (attr == &veth_active_attr) {
1204                 if (value && !pool->active) {
1205                         if(ibmveth_alloc_buffer_pool(pool)) {
1206                                 ibmveth_error_printk("unable to alloc pool\n");
1207                                 return -ENOMEM;
1208                         }
1209                         pool->active = 1;
1210                         adapter->pool_config = 1;
1211                         ibmveth_close(netdev);
1212                         adapter->pool_config = 0;
1213                         if ((rc = ibmveth_open(netdev)))
1214                                 return rc;
1215                 } else if (!value && pool->active) {
1216                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1217                         int i;
1218                         /* Make sure there is a buffer pool with buffers that
1219                            can hold a packet of the size of the MTU */
1220                         for(i = 0; i<IbmVethNumBufferPools; i++) {
1221                                 if (pool == &adapter->rx_buff_pool[i])
1222                                         continue;
1223                                 if (!adapter->rx_buff_pool[i].active)
1224                                         continue;
1225                                 if (mtu < adapter->rx_buff_pool[i].buff_size) {
1226                                         pool->active = 0;
1227                                         h_free_logical_lan_buffer(adapter->
1228                                                                   vdev->
1229                                                                   unit_address,
1230                                                                   pool->
1231                                                                   buff_size);
1232                                 }
1233                         }
1234                         if (pool->active) {
1235                                 ibmveth_error_printk("no active pool >= MTU\n");
1236                                 return -EPERM;
1237                         }
1238                 }
1239         } else if (attr == &veth_num_attr) {
1240                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
1241                         return -EINVAL;
1242                 else {
1243                         adapter->pool_config = 1;
1244                         ibmveth_close(netdev);
1245                         adapter->pool_config = 0;
1246                         pool->size = value;
1247                         if ((rc = ibmveth_open(netdev)))
1248                                 return rc;
1249                 }
1250         } else if (attr == &veth_size_attr) {
1251                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
1252                         return -EINVAL;
1253                 else {
1254                         adapter->pool_config = 1;
1255                         ibmveth_close(netdev);
1256                         adapter->pool_config = 0;
1257                         pool->buff_size = value;
1258                         if ((rc = ibmveth_open(netdev)))
1259                                 return rc;
1260                 }
1261         }
1262
1263         /* kick the interrupt handler to allocate/deallocate pools */
1264         ibmveth_interrupt(netdev->irq, netdev, NULL);
1265         return count;
1266 }
1267
1268
1269 #define ATTR(_name, _mode)      \
1270         struct attribute veth_##_name##_attr = {               \
1271         .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE \
1272         };
1273
1274 static ATTR(active, 0644);
1275 static ATTR(num, 0644);
1276 static ATTR(size, 0644);
1277
1278 static struct attribute * veth_pool_attrs[] = {
1279         &veth_active_attr,
1280         &veth_num_attr,
1281         &veth_size_attr,
1282         NULL,
1283 };
1284
1285 static struct sysfs_ops veth_pool_ops = {
1286         .show   = veth_pool_show,
1287         .store  = veth_pool_store,
1288 };
1289
1290 static struct kobj_type ktype_veth_pool = {
1291         .release        = NULL,
1292         .sysfs_ops      = &veth_pool_ops,
1293         .default_attrs  = veth_pool_attrs,
1294 };
1295
1296
1297 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
1298         { "network", "IBM,l-lan"},
1299         { "", "" }
1300 };
1301 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1302
1303 static struct vio_driver ibmveth_driver = {
1304         .id_table       = ibmveth_device_table,
1305         .probe          = ibmveth_probe,
1306         .remove         = ibmveth_remove,
1307         .driver         = {
1308                 .name   = ibmveth_driver_name,
1309                 .owner  = THIS_MODULE,
1310         }
1311 };
1312
1313 static int __init ibmveth_module_init(void)
1314 {
1315         ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version);
1316
1317         ibmveth_proc_register_driver();
1318
1319         return vio_register_driver(&ibmveth_driver);
1320 }
1321
1322 static void __exit ibmveth_module_exit(void)
1323 {
1324         vio_unregister_driver(&ibmveth_driver);
1325         ibmveth_proc_unregister_driver();
1326 }
1327
1328 module_init(ibmveth_module_init);
1329 module_exit(ibmveth_module_exit);