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#include <net/tcp.h>
  50#include <net/ip6_checksum.h>
  51
  52#include "ibmveth.h"
  53
  54static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  55static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  56static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  57
  58static struct kobj_type ktype_veth_pool;
  59
  60
  61static const char ibmveth_driver_name[] = "ibmveth";
  62static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  63#define ibmveth_driver_version "1.06"
  64
  65MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  66MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  67MODULE_LICENSE("GPL");
  68MODULE_VERSION(ibmveth_driver_version);
  69
  70static unsigned int tx_copybreak __read_mostly = 128;
  71module_param(tx_copybreak, uint, 0644);
  72MODULE_PARM_DESC(tx_copybreak,
  73	"Maximum size of packet that is copied to a new buffer on transmit");
  74
  75static unsigned int rx_copybreak __read_mostly = 128;
  76module_param(rx_copybreak, uint, 0644);
  77MODULE_PARM_DESC(rx_copybreak,
  78	"Maximum size of packet that is copied to a new buffer on receive");
  79
  80static unsigned int rx_flush __read_mostly = 0;
  81module_param(rx_flush, uint, 0644);
  82MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  83
  84static bool old_large_send __read_mostly;
  85module_param(old_large_send, bool, 0444);
  86MODULE_PARM_DESC(old_large_send,
  87	"Use old large send method on firmware that supports the new method");
  88
  89struct ibmveth_stat {
  90	char name[ETH_GSTRING_LEN];
  91	int offset;
  92};
  93
  94#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  95#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  96
  97struct ibmveth_stat ibmveth_stats[] = {
  98	{ "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  99	{ "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
 100	{ "replenish_add_buff_failure",
 101			IBMVETH_STAT_OFF(replenish_add_buff_failure) },
 102	{ "replenish_add_buff_success",
 103			IBMVETH_STAT_OFF(replenish_add_buff_success) },
 104	{ "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
 105	{ "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
 106	{ "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 107	{ "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 108	{ "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
 109	{ "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
 110	{ "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
 111	{ "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
 112	{ "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
 113};
 114
 115/* simple methods of getting data from the current rxq entry */
 116static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 117{
 118	return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
 119}
 120
 121static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 122{
 123	return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 124			IBMVETH_RXQ_TOGGLE_SHIFT;
 125}
 126
 127static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 128{
 129	return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 130}
 131
 132static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 133{
 134	return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 135}
 136
 137static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 138{
 139	return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 140}
 141
 142static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
 143{
 144	return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
 145}
 146
 147static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 148{
 149	return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 150}
 151
 152static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 153{
 154	return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 155}
 156
 157/* setup the initial settings for a buffer pool */
 158static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 159				     u32 pool_index, u32 pool_size,
 160				     u32 buff_size, u32 pool_active)
 161{
 162	pool->size = pool_size;
 163	pool->index = pool_index;
 164	pool->buff_size = buff_size;
 165	pool->threshold = pool_size * 7 / 8;
 166	pool->active = pool_active;
 167}
 168
 169/* allocate and setup an buffer pool - called during open */
 170static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 171{
 172	int i;
 173
 174	pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 175
 176	if (!pool->free_map)
 177		return -1;
 178
 179	pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
 180	if (!pool->dma_addr) {
 181		kfree(pool->free_map);
 182		pool->free_map = NULL;
 183		return -1;
 184	}
 185
 186	pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 187
 188	if (!pool->skbuff) {
 189		kfree(pool->dma_addr);
 190		pool->dma_addr = NULL;
 191
 192		kfree(pool->free_map);
 193		pool->free_map = NULL;
 194		return -1;
 195	}
 196
 197	for (i = 0; i < pool->size; ++i)
 198		pool->free_map[i] = i;
 199
 200	atomic_set(&pool->available, 0);
 201	pool->producer_index = 0;
 202	pool->consumer_index = 0;
 203
 204	return 0;
 205}
 206
 207static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
 208{
 209	unsigned long offset;
 210
 211	for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
 212		asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
 213}
 214
 215/* replenish the buffers for a pool.  note that we don't need to
 216 * skb_reserve these since they are used for incoming...
 217 */
 218static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
 219					  struct ibmveth_buff_pool *pool)
 220{
 221	u32 i;
 222	u32 count = pool->size - atomic_read(&pool->available);
 223	u32 buffers_added = 0;
 224	struct sk_buff *skb;
 225	unsigned int free_index, index;
 226	u64 correlator;
 227	unsigned long lpar_rc;
 228	dma_addr_t dma_addr;
 229
 230	mb();
 231
 232	for (i = 0; i < count; ++i) {
 233		union ibmveth_buf_desc desc;
 234
 235		skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 236
 237		if (!skb) {
 238			netdev_dbg(adapter->netdev,
 239				   "replenish: unable to allocate skb\n");
 240			adapter->replenish_no_mem++;
 241			break;
 242		}
 243
 244		free_index = pool->consumer_index;
 245		pool->consumer_index++;
 246		if (pool->consumer_index >= pool->size)
 247			pool->consumer_index = 0;
 248		index = pool->free_map[free_index];
 249
 250		BUG_ON(index == IBM_VETH_INVALID_MAP);
 251		BUG_ON(pool->skbuff[index] != NULL);
 252
 253		dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 254				pool->buff_size, DMA_FROM_DEVICE);
 255
 256		if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 257			goto failure;
 258
 259		pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 260		pool->dma_addr[index] = dma_addr;
 261		pool->skbuff[index] = skb;
 262
 263		correlator = ((u64)pool->index << 32) | index;
 264		*(u64 *)skb->data = correlator;
 265
 266		desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 267		desc.fields.address = dma_addr;
 268
 269		if (rx_flush) {
 270			unsigned int len = min(pool->buff_size,
 271						adapter->netdev->mtu +
 272						IBMVETH_BUFF_OH);
 273			ibmveth_flush_buffer(skb->data, len);
 274		}
 275		lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
 276						   desc.desc);
 277
 278		if (lpar_rc != H_SUCCESS) {
 279			goto failure;
 280		} else {
 281			buffers_added++;
 282			adapter->replenish_add_buff_success++;
 283		}
 284	}
 285
 286	mb();
 287	atomic_add(buffers_added, &(pool->available));
 288	return;
 289
 290failure:
 291	pool->free_map[free_index] = index;
 292	pool->skbuff[index] = NULL;
 293	if (pool->consumer_index == 0)
 294		pool->consumer_index = pool->size - 1;
 295	else
 296		pool->consumer_index--;
 297	if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 298		dma_unmap_single(&adapter->vdev->dev,
 299		                 pool->dma_addr[index], pool->buff_size,
 300		                 DMA_FROM_DEVICE);
 301	dev_kfree_skb_any(skb);
 302	adapter->replenish_add_buff_failure++;
 303
 304	mb();
 305	atomic_add(buffers_added, &(pool->available));
 306}
 307
 308/*
 309 * The final 8 bytes of the buffer list is a counter of frames dropped
 310 * because there was not a buffer in the buffer list capable of holding
 311 * the frame.
 312 */
 313static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
 314{
 315	__be64 *p = adapter->buffer_list_addr + 4096 - 8;
 316
 317	adapter->rx_no_buffer = be64_to_cpup(p);
 318}
 319
 320/* replenish routine */
 321static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 322{
 323	int i;
 324
 325	adapter->replenish_task_cycles++;
 326
 327	for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 328		struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 329
 330		if (pool->active &&
 331		    (atomic_read(&pool->available) < pool->threshold))
 332			ibmveth_replenish_buffer_pool(adapter, pool);
 333	}
 334
 335	ibmveth_update_rx_no_buffer(adapter);
 336}
 337
 338/* empty and free ana buffer pool - also used to do cleanup in error paths */
 339static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 340				     struct ibmveth_buff_pool *pool)
 341{
 342	int i;
 343
 344	kfree(pool->free_map);
 345	pool->free_map = NULL;
 346
 347	if (pool->skbuff && pool->dma_addr) {
 348		for (i = 0; i < pool->size; ++i) {
 349			struct sk_buff *skb = pool->skbuff[i];
 350			if (skb) {
 351				dma_unmap_single(&adapter->vdev->dev,
 352						 pool->dma_addr[i],
 353						 pool->buff_size,
 354						 DMA_FROM_DEVICE);
 355				dev_kfree_skb_any(skb);
 356				pool->skbuff[i] = NULL;
 357			}
 358		}
 359	}
 360
 361	if (pool->dma_addr) {
 362		kfree(pool->dma_addr);
 363		pool->dma_addr = NULL;
 364	}
 365
 366	if (pool->skbuff) {
 367		kfree(pool->skbuff);
 368		pool->skbuff = NULL;
 369	}
 370}
 371
 372/* remove a buffer from a pool */
 373static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 374					    u64 correlator)
 375{
 376	unsigned int pool  = correlator >> 32;
 377	unsigned int index = correlator & 0xffffffffUL;
 378	unsigned int free_index;
 379	struct sk_buff *skb;
 380
 381	BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 382	BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 383
 384	skb = adapter->rx_buff_pool[pool].skbuff[index];
 385
 386	BUG_ON(skb == NULL);
 387
 388	adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 389
 390	dma_unmap_single(&adapter->vdev->dev,
 391			 adapter->rx_buff_pool[pool].dma_addr[index],
 392			 adapter->rx_buff_pool[pool].buff_size,
 393			 DMA_FROM_DEVICE);
 394
 395	free_index = adapter->rx_buff_pool[pool].producer_index;
 396	adapter->rx_buff_pool[pool].producer_index++;
 397	if (adapter->rx_buff_pool[pool].producer_index >=
 398	    adapter->rx_buff_pool[pool].size)
 399		adapter->rx_buff_pool[pool].producer_index = 0;
 400	adapter->rx_buff_pool[pool].free_map[free_index] = index;
 401
 402	mb();
 403
 404	atomic_dec(&(adapter->rx_buff_pool[pool].available));
 405}
 406
 407/* get the current buffer on the rx queue */
 408static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 409{
 410	u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 411	unsigned int pool = correlator >> 32;
 412	unsigned int index = correlator & 0xffffffffUL;
 413
 414	BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 415	BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 416
 417	return adapter->rx_buff_pool[pool].skbuff[index];
 418}
 419
 420/* recycle the current buffer on the rx queue */
 421static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 422{
 423	u32 q_index = adapter->rx_queue.index;
 424	u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 425	unsigned int pool = correlator >> 32;
 426	unsigned int index = correlator & 0xffffffffUL;
 427	union ibmveth_buf_desc desc;
 428	unsigned long lpar_rc;
 429	int ret = 1;
 430
 431	BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 432	BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 433
 434	if (!adapter->rx_buff_pool[pool].active) {
 435		ibmveth_rxq_harvest_buffer(adapter);
 436		ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 437		goto out;
 438	}
 439
 440	desc.fields.flags_len = IBMVETH_BUF_VALID |
 441		adapter->rx_buff_pool[pool].buff_size;
 442	desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 443
 444	lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 445
 446	if (lpar_rc != H_SUCCESS) {
 447		netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 448			   "during recycle rc=%ld", lpar_rc);
 449		ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 450		ret = 0;
 451	}
 452
 453	if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 454		adapter->rx_queue.index = 0;
 455		adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 456	}
 457
 458out:
 459	return ret;
 460}
 461
 462static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 463{
 464	ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 465
 466	if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 467		adapter->rx_queue.index = 0;
 468		adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 469	}
 470}
 471
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 472static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 473        union ibmveth_buf_desc rxq_desc, u64 mac_address)
 474{
 475	int rc, try_again = 1;
 476
 477	/*
 478	 * After a kexec the adapter will still be open, so our attempt to
 479	 * open it will fail. So if we get a failure we free the adapter and
 480	 * try again, but only once.
 481	 */
 482retry:
 483	rc = h_register_logical_lan(adapter->vdev->unit_address,
 484				    adapter->buffer_list_dma, rxq_desc.desc,
 485				    adapter->filter_list_dma, mac_address);
 486
 487	if (rc != H_SUCCESS && try_again) {
 488		do {
 489			rc = h_free_logical_lan(adapter->vdev->unit_address);
 490		} while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 491
 492		try_again = 0;
 493		goto retry;
 494	}
 495
 496	return rc;
 497}
 498
 499static u64 ibmveth_encode_mac_addr(u8 *mac)
 500{
 501	int i;
 502	u64 encoded = 0;
 503
 504	for (i = 0; i < ETH_ALEN; i++)
 505		encoded = (encoded << 8) | mac[i];
 506
 507	return encoded;
 508}
 509
 510static int ibmveth_open(struct net_device *netdev)
 511{
 512	struct ibmveth_adapter *adapter = netdev_priv(netdev);
 513	u64 mac_address;
 514	int rxq_entries = 1;
 515	unsigned long lpar_rc;
 516	int rc;
 517	union ibmveth_buf_desc rxq_desc;
 518	int i;
 519	struct device *dev;
 520
 521	netdev_dbg(netdev, "open starting\n");
 522
 523	napi_enable(&adapter->napi);
 524
 525	for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 526		rxq_entries += adapter->rx_buff_pool[i].size;
 527
 528	rc = -ENOMEM;
 529	adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 530	if (!adapter->buffer_list_addr) {
 531		netdev_err(netdev, "unable to allocate list pages\n");
 532		goto out;
 533	}
 534
 535	adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 536	if (!adapter->filter_list_addr) {
 537		netdev_err(netdev, "unable to allocate filter pages\n");
 538		goto out_free_buffer_list;
 
 
 
 539	}
 540
 541	dev = &adapter->vdev->dev;
 542
 543	adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 544						rxq_entries;
 545	adapter->rx_queue.queue_addr =
 546		dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 547				   &adapter->rx_queue.queue_dma, GFP_KERNEL);
 548	if (!adapter->rx_queue.queue_addr)
 549		goto out_free_filter_list;
 
 
 550
 551	adapter->buffer_list_dma = dma_map_single(dev,
 552			adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 553	if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
 554		netdev_err(netdev, "unable to map buffer list pages\n");
 555		goto out_free_queue_mem;
 556	}
 557
 558	adapter->filter_list_dma = dma_map_single(dev,
 559			adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 560	if (dma_mapping_error(dev, adapter->filter_list_dma)) {
 561		netdev_err(netdev, "unable to map filter list pages\n");
 562		goto out_unmap_buffer_list;
 
 
 
 
 563	}
 564
 565	adapter->rx_queue.index = 0;
 566	adapter->rx_queue.num_slots = rxq_entries;
 567	adapter->rx_queue.toggle = 1;
 568
 569	mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 570
 571	rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 572					adapter->rx_queue.queue_len;
 573	rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 574
 575	netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 576	netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 577	netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 578
 579	h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 580
 581	lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 582
 583	if (lpar_rc != H_SUCCESS) {
 584		netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 585			   lpar_rc);
 586		netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 587			   "desc:0x%llx MAC:0x%llx\n",
 588				     adapter->buffer_list_dma,
 589				     adapter->filter_list_dma,
 590				     rxq_desc.desc,
 591				     mac_address);
 592		rc = -ENONET;
 593		goto out_unmap_filter_list;
 594	}
 595
 596	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 597		if (!adapter->rx_buff_pool[i].active)
 598			continue;
 599		if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 600			netdev_err(netdev, "unable to alloc pool\n");
 601			adapter->rx_buff_pool[i].active = 0;
 602			rc = -ENOMEM;
 603			goto out_free_buffer_pools;
 604		}
 605	}
 606
 607	netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 608	rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 609			 netdev);
 610	if (rc != 0) {
 611		netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 612			   netdev->irq, rc);
 613		do {
 614			lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 615		} while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 616
 617		goto out_free_buffer_pools;
 618	}
 619
 620	rc = -ENOMEM;
 621	adapter->bounce_buffer =
 622	    kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 623	if (!adapter->bounce_buffer)
 624		goto out_free_irq;
 625
 
 626	adapter->bounce_buffer_dma =
 627	    dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 628			   netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 629	if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 630		netdev_err(netdev, "unable to map bounce buffer\n");
 631		goto out_free_bounce_buffer;
 
 632	}
 633
 634	netdev_dbg(netdev, "initial replenish cycle\n");
 635	ibmveth_interrupt(netdev->irq, netdev);
 636
 637	netif_start_queue(netdev);
 638
 639	netdev_dbg(netdev, "open complete\n");
 640
 641	return 0;
 642
 643out_free_bounce_buffer:
 644	kfree(adapter->bounce_buffer);
 645out_free_irq:
 646	free_irq(netdev->irq, netdev);
 647out_free_buffer_pools:
 648	while (--i >= 0) {
 649		if (adapter->rx_buff_pool[i].active)
 650			ibmveth_free_buffer_pool(adapter,
 651						 &adapter->rx_buff_pool[i]);
 652	}
 653out_unmap_filter_list:
 654	dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 655			 DMA_BIDIRECTIONAL);
 656out_unmap_buffer_list:
 657	dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 658			 DMA_BIDIRECTIONAL);
 659out_free_queue_mem:
 660	dma_free_coherent(dev, adapter->rx_queue.queue_len,
 661			  adapter->rx_queue.queue_addr,
 662			  adapter->rx_queue.queue_dma);
 663out_free_filter_list:
 664	free_page((unsigned long)adapter->filter_list_addr);
 665out_free_buffer_list:
 666	free_page((unsigned long)adapter->buffer_list_addr);
 667out:
 668	napi_disable(&adapter->napi);
 669	return rc;
 670}
 671
 672static int ibmveth_close(struct net_device *netdev)
 673{
 674	struct ibmveth_adapter *adapter = netdev_priv(netdev);
 675	struct device *dev = &adapter->vdev->dev;
 676	long lpar_rc;
 677	int i;
 678
 679	netdev_dbg(netdev, "close starting\n");
 680
 681	napi_disable(&adapter->napi);
 682
 683	if (!adapter->pool_config)
 684		netif_stop_queue(netdev);
 685
 686	h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 687
 688	do {
 689		lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 690	} while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 691
 692	if (lpar_rc != H_SUCCESS) {
 693		netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 694			   "continuing with close\n", lpar_rc);
 695	}
 696
 697	free_irq(netdev->irq, netdev);
 698
 699	ibmveth_update_rx_no_buffer(adapter);
 700
 701	dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 702			 DMA_BIDIRECTIONAL);
 703	free_page((unsigned long)adapter->buffer_list_addr);
 704
 705	dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 706			 DMA_BIDIRECTIONAL);
 707	free_page((unsigned long)adapter->filter_list_addr);
 708
 709	dma_free_coherent(dev, adapter->rx_queue.queue_len,
 710			  adapter->rx_queue.queue_addr,
 711			  adapter->rx_queue.queue_dma);
 712
 713	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 714		if (adapter->rx_buff_pool[i].active)
 715			ibmveth_free_buffer_pool(adapter,
 716						 &adapter->rx_buff_pool[i]);
 717
 718	dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma,
 719			 adapter->netdev->mtu + IBMVETH_BUFF_OH,
 720			 DMA_BIDIRECTIONAL);
 721	kfree(adapter->bounce_buffer);
 722
 723	netdev_dbg(netdev, "close complete\n");
 724
 725	return 0;
 726}
 727
 728static int netdev_get_link_ksettings(struct net_device *dev,
 729				     struct ethtool_link_ksettings *cmd)
 730{
 731	u32 supported, advertising;
 732
 733	supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 734				SUPPORTED_FIBRE);
 735	advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 736				ADVERTISED_FIBRE);
 737	cmd->base.speed = SPEED_1000;
 738	cmd->base.duplex = DUPLEX_FULL;
 739	cmd->base.port = PORT_FIBRE;
 740	cmd->base.phy_address = 0;
 741	cmd->base.autoneg = AUTONEG_ENABLE;
 742
 743	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 744						supported);
 745	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 746						advertising);
 747
 748	return 0;
 749}
 750
 751static void netdev_get_drvinfo(struct net_device *dev,
 752			       struct ethtool_drvinfo *info)
 753{
 754	strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 755	strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
 756}
 757
 758static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 759	netdev_features_t features)
 760{
 761	/*
 762	 * Since the ibmveth firmware interface does not have the
 763	 * concept of separate tx/rx checksum offload enable, if rx
 764	 * checksum is disabled we also have to disable tx checksum
 765	 * offload. Once we disable rx checksum offload, we are no
 766	 * longer allowed to send tx buffers that are not properly
 767	 * checksummed.
 768	 */
 769
 770	if (!(features & NETIF_F_RXCSUM))
 771		features &= ~NETIF_F_CSUM_MASK;
 772
 773	return features;
 774}
 775
 776static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 777{
 778	struct ibmveth_adapter *adapter = netdev_priv(dev);
 779	unsigned long set_attr, clr_attr, ret_attr;
 780	unsigned long set_attr6, clr_attr6;
 781	long ret, ret4, ret6;
 782	int rc1 = 0, rc2 = 0;
 783	int restart = 0;
 784
 785	if (netif_running(dev)) {
 786		restart = 1;
 787		adapter->pool_config = 1;
 788		ibmveth_close(dev);
 789		adapter->pool_config = 0;
 790	}
 791
 792	set_attr = 0;
 793	clr_attr = 0;
 794	set_attr6 = 0;
 795	clr_attr6 = 0;
 796
 797	if (data) {
 798		set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 799		set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 800	} else {
 801		clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 802		clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 803	}
 804
 805	ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 806
 807	if (ret == H_SUCCESS &&
 
 808	    (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 809		ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 810					 set_attr, &ret_attr);
 811
 812		if (ret4 != H_SUCCESS) {
 813			netdev_err(dev, "unable to change IPv4 checksum "
 814					"offload settings. %d rc=%ld\n",
 815					data, ret4);
 816
 817			h_illan_attributes(adapter->vdev->unit_address,
 818					   set_attr, clr_attr, &ret_attr);
 819
 820			if (data == 1)
 821				dev->features &= ~NETIF_F_IP_CSUM;
 822
 823		} else {
 824			adapter->fw_ipv4_csum_support = data;
 825		}
 826
 827		ret6 = h_illan_attributes(adapter->vdev->unit_address,
 828					 clr_attr6, set_attr6, &ret_attr);
 829
 830		if (ret6 != H_SUCCESS) {
 831			netdev_err(dev, "unable to change IPv6 checksum "
 832					"offload settings. %d rc=%ld\n",
 833					data, ret6);
 834
 835			h_illan_attributes(adapter->vdev->unit_address,
 836					   set_attr6, clr_attr6, &ret_attr);
 837
 838			if (data == 1)
 839				dev->features &= ~NETIF_F_IPV6_CSUM;
 840
 841		} else
 842			adapter->fw_ipv6_csum_support = data;
 843
 844		if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 845			adapter->rx_csum = data;
 846		else
 847			rc1 = -EIO;
 848	} else {
 849		rc1 = -EIO;
 850		netdev_err(dev, "unable to change checksum offload settings."
 851				     " %d rc=%ld ret_attr=%lx\n", data, ret,
 852				     ret_attr);
 853	}
 854
 855	if (restart)
 856		rc2 = ibmveth_open(dev);
 857
 858	return rc1 ? rc1 : rc2;
 859}
 860
 861static int ibmveth_set_tso(struct net_device *dev, u32 data)
 862{
 863	struct ibmveth_adapter *adapter = netdev_priv(dev);
 864	unsigned long set_attr, clr_attr, ret_attr;
 865	long ret1, ret2;
 866	int rc1 = 0, rc2 = 0;
 867	int restart = 0;
 868
 869	if (netif_running(dev)) {
 870		restart = 1;
 871		adapter->pool_config = 1;
 872		ibmveth_close(dev);
 873		adapter->pool_config = 0;
 874	}
 875
 876	set_attr = 0;
 877	clr_attr = 0;
 878
 879	if (data)
 880		set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 881	else
 882		clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 883
 884	ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 885
 886	if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
 887	    !old_large_send) {
 888		ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 889					  set_attr, &ret_attr);
 890
 891		if (ret2 != H_SUCCESS) {
 892			netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
 893				   data, ret2);
 894
 895			h_illan_attributes(adapter->vdev->unit_address,
 896					   set_attr, clr_attr, &ret_attr);
 897
 898			if (data == 1)
 899				dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 900			rc1 = -EIO;
 901
 902		} else {
 903			adapter->fw_large_send_support = data;
 904			adapter->large_send = data;
 905		}
 906	} else {
 907		/* Older firmware version of large send offload does not
 908		 * support tcp6/ipv6
 909		 */
 910		if (data == 1) {
 911			dev->features &= ~NETIF_F_TSO6;
 912			netdev_info(dev, "TSO feature requires all partitions to have updated driver");
 913		}
 914		adapter->large_send = data;
 915	}
 916
 917	if (restart)
 918		rc2 = ibmveth_open(dev);
 919
 920	return rc1 ? rc1 : rc2;
 921}
 922
 923static int ibmveth_set_features(struct net_device *dev,
 924	netdev_features_t features)
 925{
 926	struct ibmveth_adapter *adapter = netdev_priv(dev);
 927	int rx_csum = !!(features & NETIF_F_RXCSUM);
 928	int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
 929	int rc1 = 0, rc2 = 0;
 930
 931	if (rx_csum != adapter->rx_csum) {
 932		rc1 = ibmveth_set_csum_offload(dev, rx_csum);
 933		if (rc1 && !adapter->rx_csum)
 934			dev->features =
 935				features & ~(NETIF_F_CSUM_MASK |
 936					     NETIF_F_RXCSUM);
 937	}
 938
 939	if (large_send != adapter->large_send) {
 940		rc2 = ibmveth_set_tso(dev, large_send);
 941		if (rc2 && !adapter->large_send)
 942			dev->features =
 943				features & ~(NETIF_F_TSO | NETIF_F_TSO6);
 944	}
 945
 946	return rc1 ? rc1 : rc2;
 947}
 948
 949static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 950{
 951	int i;
 952
 953	if (stringset != ETH_SS_STATS)
 954		return;
 955
 956	for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 957		memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 958}
 959
 960static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 961{
 962	switch (sset) {
 963	case ETH_SS_STATS:
 964		return ARRAY_SIZE(ibmveth_stats);
 965	default:
 966		return -EOPNOTSUPP;
 967	}
 968}
 969
 970static void ibmveth_get_ethtool_stats(struct net_device *dev,
 971				      struct ethtool_stats *stats, u64 *data)
 972{
 973	int i;
 974	struct ibmveth_adapter *adapter = netdev_priv(dev);
 975
 976	for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 977		data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 978}
 979
 980static const struct ethtool_ops netdev_ethtool_ops = {
 981	.get_drvinfo		= netdev_get_drvinfo,
 
 982	.get_link		= ethtool_op_get_link,
 983	.get_strings		= ibmveth_get_strings,
 984	.get_sset_count		= ibmveth_get_sset_count,
 985	.get_ethtool_stats	= ibmveth_get_ethtool_stats,
 986	.get_link_ksettings	= netdev_get_link_ksettings,
 987};
 988
 989static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 990{
 991	return -EOPNOTSUPP;
 992}
 993
 994#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 995
 996static int ibmveth_send(struct ibmveth_adapter *adapter,
 997			union ibmveth_buf_desc *descs, unsigned long mss)
 998{
 999	unsigned long correlator;
1000	unsigned int retry_count;
1001	unsigned long ret;
1002
1003	/*
1004	 * The retry count sets a maximum for the number of broadcast and
1005	 * multicast destinations within the system.
1006	 */
1007	retry_count = 1024;
1008	correlator = 0;
1009	do {
1010		ret = h_send_logical_lan(adapter->vdev->unit_address,
1011					     descs[0].desc, descs[1].desc,
1012					     descs[2].desc, descs[3].desc,
1013					     descs[4].desc, descs[5].desc,
1014					     correlator, &correlator, mss,
1015					     adapter->fw_large_send_support);
1016	} while ((ret == H_BUSY) && (retry_count--));
1017
1018	if (ret != H_SUCCESS && ret != H_DROPPED) {
1019		netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1020			   "with rc=%ld\n", ret);
1021		return 1;
1022	}
1023
1024	return 0;
1025}
1026
1027static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1028				      struct net_device *netdev)
1029{
1030	struct ibmveth_adapter *adapter = netdev_priv(netdev);
1031	unsigned int desc_flags;
1032	union ibmveth_buf_desc descs[6];
1033	int last, i;
1034	int force_bounce = 0;
1035	dma_addr_t dma_addr;
1036	unsigned long mss = 0;
1037
1038	/* veth doesn't handle frag_list, so linearize the skb.
1039	 * When GRO is enabled SKB's can have frag_list.
1040	 */
1041	if (adapter->is_active_trunk &&
1042	    skb_has_frag_list(skb) && __skb_linearize(skb)) {
1043		netdev->stats.tx_dropped++;
1044		goto out;
1045	}
1046
1047	/*
1048	 * veth handles a maximum of 6 segments including the header, so
1049	 * we have to linearize the skb if there are more than this.
1050	 */
1051	if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1052		netdev->stats.tx_dropped++;
1053		goto out;
1054	}
1055
1056	/* veth can't checksum offload UDP */
1057	if (skb->ip_summed == CHECKSUM_PARTIAL &&
1058	    ((skb->protocol == htons(ETH_P_IP) &&
1059	      ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1060	     (skb->protocol == htons(ETH_P_IPV6) &&
1061	      ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1062	    skb_checksum_help(skb)) {
1063
1064		netdev_err(netdev, "tx: failed to checksum packet\n");
1065		netdev->stats.tx_dropped++;
1066		goto out;
1067	}
1068
1069	desc_flags = IBMVETH_BUF_VALID;
1070
 
 
 
1071	if (skb->ip_summed == CHECKSUM_PARTIAL) {
1072		unsigned char *buf = skb_transport_header(skb) +
1073						skb->csum_offset;
1074
1075		desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1076
1077		/* Need to zero out the checksum */
1078		buf[0] = 0;
1079		buf[1] = 0;
1080
1081		if (skb_is_gso(skb) && adapter->fw_large_send_support)
1082			desc_flags |= IBMVETH_BUF_LRG_SND;
1083	}
1084
1085retry_bounce:
1086	memset(descs, 0, sizeof(descs));
1087
1088	/*
1089	 * If a linear packet is below the rx threshold then
1090	 * copy it into the static bounce buffer. This avoids the
1091	 * cost of a TCE insert and remove.
1092	 */
1093	if (force_bounce || (!skb_is_nonlinear(skb) &&
1094				(skb->len < tx_copybreak))) {
1095		skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1096					  skb->len);
1097
1098		descs[0].fields.flags_len = desc_flags | skb->len;
1099		descs[0].fields.address = adapter->bounce_buffer_dma;
1100
1101		if (ibmveth_send(adapter, descs, 0)) {
1102			adapter->tx_send_failed++;
1103			netdev->stats.tx_dropped++;
1104		} else {
1105			netdev->stats.tx_packets++;
1106			netdev->stats.tx_bytes += skb->len;
1107		}
1108
1109		goto out;
1110	}
1111
1112	/* Map the header */
1113	dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1114				  skb_headlen(skb), DMA_TO_DEVICE);
1115	if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1116		goto map_failed;
1117
1118	descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1119	descs[0].fields.address = dma_addr;
1120
1121	/* Map the frags */
1122	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1123		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1124
1125		dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1126					    skb_frag_size(frag), DMA_TO_DEVICE);
1127
1128		if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1129			goto map_failed_frags;
1130
1131		descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1132		descs[i+1].fields.address = dma_addr;
1133	}
1134
1135	if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1136		if (adapter->fw_large_send_support) {
1137			mss = (unsigned long)skb_shinfo(skb)->gso_size;
1138			adapter->tx_large_packets++;
1139		} else if (!skb_is_gso_v6(skb)) {
1140			/* Put -1 in the IP checksum to tell phyp it
1141			 * is a largesend packet. Put the mss in
1142			 * the TCP checksum.
1143			 */
1144			ip_hdr(skb)->check = 0xffff;
1145			tcp_hdr(skb)->check =
1146				cpu_to_be16(skb_shinfo(skb)->gso_size);
1147			adapter->tx_large_packets++;
1148		}
1149	}
1150
1151	if (ibmveth_send(adapter, descs, mss)) {
1152		adapter->tx_send_failed++;
1153		netdev->stats.tx_dropped++;
1154	} else {
1155		netdev->stats.tx_packets++;
1156		netdev->stats.tx_bytes += skb->len;
1157	}
1158
1159	dma_unmap_single(&adapter->vdev->dev,
1160			 descs[0].fields.address,
1161			 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1162			 DMA_TO_DEVICE);
1163
1164	for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1165		dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1166			       descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1167			       DMA_TO_DEVICE);
1168
1169out:
1170	dev_consume_skb_any(skb);
1171	return NETDEV_TX_OK;
1172
1173map_failed_frags:
1174	last = i+1;
1175	for (i = 0; i < last; i++)
1176		dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1177			       descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1178			       DMA_TO_DEVICE);
1179
1180map_failed:
1181	if (!firmware_has_feature(FW_FEATURE_CMO))
1182		netdev_err(netdev, "tx: unable to map xmit buffer\n");
1183	adapter->tx_map_failed++;
1184	if (skb_linearize(skb)) {
1185		netdev->stats.tx_dropped++;
1186		goto out;
1187	}
1188	force_bounce = 1;
1189	goto retry_bounce;
1190}
1191
1192static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1193{
1194	struct tcphdr *tcph;
1195	int offset = 0;
1196	int hdr_len;
1197
1198	/* only TCP packets will be aggregated */
1199	if (skb->protocol == htons(ETH_P_IP)) {
1200		struct iphdr *iph = (struct iphdr *)skb->data;
1201
1202		if (iph->protocol == IPPROTO_TCP) {
1203			offset = iph->ihl * 4;
1204			skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1205		} else {
1206			return;
1207		}
1208	} else if (skb->protocol == htons(ETH_P_IPV6)) {
1209		struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1210
1211		if (iph6->nexthdr == IPPROTO_TCP) {
1212			offset = sizeof(struct ipv6hdr);
1213			skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1214		} else {
1215			return;
1216		}
1217	} else {
1218		return;
1219	}
1220	/* if mss is not set through Large Packet bit/mss in rx buffer,
1221	 * expect that the mss will be written to the tcp header checksum.
1222	 */
1223	tcph = (struct tcphdr *)(skb->data + offset);
1224	if (lrg_pkt) {
1225		skb_shinfo(skb)->gso_size = mss;
1226	} else if (offset) {
1227		skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1228		tcph->check = 0;
1229	}
1230
1231	if (skb_shinfo(skb)->gso_size) {
1232		hdr_len = offset + tcph->doff * 4;
1233		skb_shinfo(skb)->gso_segs =
1234				DIV_ROUND_UP(skb->len - hdr_len,
1235					     skb_shinfo(skb)->gso_size);
1236	}
1237}
1238
1239static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1240				   struct ibmveth_adapter *adapter)
1241{
1242	struct iphdr *iph = NULL;
1243	struct ipv6hdr *iph6 = NULL;
1244	__be16 skb_proto = 0;
1245	u16 iphlen = 0;
1246	u16 iph_proto = 0;
1247	u16 tcphdrlen = 0;
1248
1249	skb_proto = be16_to_cpu(skb->protocol);
1250
1251	if (skb_proto == ETH_P_IP) {
1252		iph = (struct iphdr *)skb->data;
1253
1254		/* If the IP checksum is not offloaded and if the packet
1255		 *  is large send, the checksum must be rebuilt.
1256		 */
1257		if (iph->check == 0xffff) {
1258			iph->check = 0;
1259			iph->check = ip_fast_csum((unsigned char *)iph,
1260						  iph->ihl);
1261		}
1262
1263		iphlen = iph->ihl * 4;
1264		iph_proto = iph->protocol;
1265	} else if (skb_proto == ETH_P_IPV6) {
1266		iph6 = (struct ipv6hdr *)skb->data;
1267		iphlen = sizeof(struct ipv6hdr);
1268		iph_proto = iph6->nexthdr;
1269	}
1270
1271	/* In OVS environment, when a flow is not cached, specifically for a
1272	 * new TCP connection, the first packet information is passed up
1273	 * the user space for finding a flow. During this process, OVS computes
1274	 * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1275	 *
1276	 * Given that we zeroed out TCP checksum field in transmit path
1277	 * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1278	 * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1279	 * in the packet. This leads to OVS dropping the packet and hence
1280	 * TCP retransmissions are seen.
1281	 *
1282	 * So, re-compute TCP pseudo header checksum.
1283	 */
1284	if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1285		struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1286
1287		tcphdrlen = skb->len - iphlen;
1288
1289		/* Recompute TCP pseudo header checksum */
1290		if (skb_proto == ETH_P_IP)
1291			tcph->check = ~csum_tcpudp_magic(iph->saddr,
1292					iph->daddr, tcphdrlen, iph_proto, 0);
1293		else if (skb_proto == ETH_P_IPV6)
1294			tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1295					&iph6->daddr, tcphdrlen, iph_proto, 0);
1296
1297		/* Setup SKB fields for checksum offload */
1298		skb_partial_csum_set(skb, iphlen,
1299				     offsetof(struct tcphdr, check));
1300		skb_reset_network_header(skb);
1301	}
1302}
1303
1304static int ibmveth_poll(struct napi_struct *napi, int budget)
1305{
1306	struct ibmveth_adapter *adapter =
1307			container_of(napi, struct ibmveth_adapter, napi);
1308	struct net_device *netdev = adapter->netdev;
1309	int frames_processed = 0;
1310	unsigned long lpar_rc;
1311	u16 mss = 0;
1312
1313restart_poll:
1314	while (frames_processed < budget) {
1315		if (!ibmveth_rxq_pending_buffer(adapter))
1316			break;
1317
1318		smp_rmb();
1319		if (!ibmveth_rxq_buffer_valid(adapter)) {
1320			wmb(); /* suggested by larson1 */
1321			adapter->rx_invalid_buffer++;
1322			netdev_dbg(netdev, "recycling invalid buffer\n");
1323			ibmveth_rxq_recycle_buffer(adapter);
1324		} else {
1325			struct sk_buff *skb, *new_skb;
1326			int length = ibmveth_rxq_frame_length(adapter);
1327			int offset = ibmveth_rxq_frame_offset(adapter);
1328			int csum_good = ibmveth_rxq_csum_good(adapter);
1329			int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1330
1331			skb = ibmveth_rxq_get_buffer(adapter);
1332
1333			/* if the large packet bit is set in the rx queue
1334			 * descriptor, the mss will be written by PHYP eight
1335			 * bytes from the start of the rx buffer, which is
1336			 * skb->data at this stage
1337			 */
1338			if (lrg_pkt) {
1339				__be64 *rxmss = (__be64 *)(skb->data + 8);
1340
1341				mss = (u16)be64_to_cpu(*rxmss);
1342			}
1343
1344			new_skb = NULL;
1345			if (length < rx_copybreak)
1346				new_skb = netdev_alloc_skb(netdev, length);
1347
1348			if (new_skb) {
1349				skb_copy_to_linear_data(new_skb,
1350							skb->data + offset,
1351							length);
1352				if (rx_flush)
1353					ibmveth_flush_buffer(skb->data,
1354						length + offset);
1355				if (!ibmveth_rxq_recycle_buffer(adapter))
1356					kfree_skb(skb);
1357				skb = new_skb;
1358			} else {
1359				ibmveth_rxq_harvest_buffer(adapter);
1360				skb_reserve(skb, offset);
1361			}
1362
1363			skb_put(skb, length);
1364			skb->protocol = eth_type_trans(skb, netdev);
1365
1366			if (csum_good) {
1367				skb->ip_summed = CHECKSUM_UNNECESSARY;
1368				ibmveth_rx_csum_helper(skb, adapter);
1369			}
1370
1371			if (length > netdev->mtu + ETH_HLEN) {
1372				ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1373				adapter->rx_large_packets++;
 
 
 
 
 
 
1374			}
1375
1376			napi_gro_receive(napi, skb);	/* send it up */
1377
1378			netdev->stats.rx_packets++;
1379			netdev->stats.rx_bytes += length;
1380			frames_processed++;
1381		}
1382	}
1383
1384	ibmveth_replenish_task(adapter);
1385
1386	if (frames_processed < budget) {
1387		napi_complete_done(napi, frames_processed);
1388
1389		/* We think we are done - reenable interrupts,
1390		 * then check once more to make sure we are done.
1391		 */
1392		lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1393				       VIO_IRQ_ENABLE);
1394
1395		BUG_ON(lpar_rc != H_SUCCESS);
1396
1397		if (ibmveth_rxq_pending_buffer(adapter) &&
1398		    napi_reschedule(napi)) {
1399			lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1400					       VIO_IRQ_DISABLE);
1401			goto restart_poll;
1402		}
1403	}
1404
1405	return frames_processed;
1406}
1407
1408static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1409{
1410	struct net_device *netdev = dev_instance;
1411	struct ibmveth_adapter *adapter = netdev_priv(netdev);
1412	unsigned long lpar_rc;
1413
1414	if (napi_schedule_prep(&adapter->napi)) {
1415		lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1416				       VIO_IRQ_DISABLE);
1417		BUG_ON(lpar_rc != H_SUCCESS);
1418		__napi_schedule(&adapter->napi);
1419	}
1420	return IRQ_HANDLED;
1421}
1422
1423static void ibmveth_set_multicast_list(struct net_device *netdev)
1424{
1425	struct ibmveth_adapter *adapter = netdev_priv(netdev);
1426	unsigned long lpar_rc;
1427
1428	if ((netdev->flags & IFF_PROMISC) ||
1429	    (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1430		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1431					   IbmVethMcastEnableRecv |
1432					   IbmVethMcastDisableFiltering,
1433					   0);
1434		if (lpar_rc != H_SUCCESS) {
1435			netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1436				   "entering promisc mode\n", lpar_rc);
1437		}
1438	} else {
1439		struct netdev_hw_addr *ha;
1440		/* clear the filter table & disable filtering */
1441		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1442					   IbmVethMcastEnableRecv |
1443					   IbmVethMcastDisableFiltering |
1444					   IbmVethMcastClearFilterTable,
1445					   0);
1446		if (lpar_rc != H_SUCCESS) {
1447			netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1448				   "attempting to clear filter table\n",
1449				   lpar_rc);
1450		}
1451		/* add the addresses to the filter table */
1452		netdev_for_each_mc_addr(ha, netdev) {
1453			/* add the multicast address to the filter table */
1454			u64 mcast_addr;
1455			mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1456			lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1457						   IbmVethMcastAddFilter,
1458						   mcast_addr);
1459			if (lpar_rc != H_SUCCESS) {
1460				netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1461					   "when adding an entry to the filter "
1462					   "table\n", lpar_rc);
1463			}
1464		}
1465
1466		/* re-enable filtering */
1467		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1468					   IbmVethMcastEnableFiltering,
1469					   0);
1470		if (lpar_rc != H_SUCCESS) {
1471			netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1472				   "enabling filtering\n", lpar_rc);
1473		}
1474	}
1475}
1476
1477static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1478{
1479	struct ibmveth_adapter *adapter = netdev_priv(dev);
1480	struct vio_dev *viodev = adapter->vdev;
1481	int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1482	int i, rc;
1483	int need_restart = 0;
1484
 
 
 
1485	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1486		if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1487			break;
1488
1489	if (i == IBMVETH_NUM_BUFF_POOLS)
1490		return -EINVAL;
1491
1492	/* Deactivate all the buffer pools so that the next loop can activate
1493	   only the buffer pools necessary to hold the new MTU */
1494	if (netif_running(adapter->netdev)) {
1495		need_restart = 1;
1496		adapter->pool_config = 1;
1497		ibmveth_close(adapter->netdev);
1498		adapter->pool_config = 0;
1499	}
1500
1501	/* Look for an active buffer pool that can hold the new MTU */
1502	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503		adapter->rx_buff_pool[i].active = 1;
1504
1505		if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1506			dev->mtu = new_mtu;
1507			vio_cmo_set_dev_desired(viodev,
1508						ibmveth_get_desired_dma
1509						(viodev));
1510			if (need_restart) {
1511				return ibmveth_open(adapter->netdev);
1512			}
1513			return 0;
1514		}
1515	}
1516
1517	if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1518		return rc;
1519
1520	return -EINVAL;
1521}
1522
1523#ifdef CONFIG_NET_POLL_CONTROLLER
1524static void ibmveth_poll_controller(struct net_device *dev)
1525{
1526	ibmveth_replenish_task(netdev_priv(dev));
1527	ibmveth_interrupt(dev->irq, dev);
1528}
1529#endif
1530
1531/**
1532 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1533 *
1534 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1535 *
1536 * Return value:
1537 *	Number of bytes of IO data the driver will need to perform well.
1538 */
1539static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1540{
1541	struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1542	struct ibmveth_adapter *adapter;
1543	struct iommu_table *tbl;
1544	unsigned long ret;
1545	int i;
1546	int rxqentries = 1;
1547
1548	tbl = get_iommu_table_base(&vdev->dev);
1549
1550	/* netdev inits at probe time along with the structures we need below*/
1551	if (netdev == NULL)
1552		return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1553
1554	adapter = netdev_priv(netdev);
1555
1556	ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1557	ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1558
1559	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1560		/* add the size of the active receive buffers */
1561		if (adapter->rx_buff_pool[i].active)
1562			ret +=
1563			    adapter->rx_buff_pool[i].size *
1564			    IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1565					     buff_size, tbl);
1566		rxqentries += adapter->rx_buff_pool[i].size;
1567	}
1568	/* add the size of the receive queue entries */
1569	ret += IOMMU_PAGE_ALIGN(
1570		rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1571
1572	return ret;
1573}
1574
1575static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1576{
1577	struct ibmveth_adapter *adapter = netdev_priv(dev);
1578	struct sockaddr *addr = p;
1579	u64 mac_address;
1580	int rc;
1581
1582	if (!is_valid_ether_addr(addr->sa_data))
1583		return -EADDRNOTAVAIL;
1584
1585	mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1586	rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1587	if (rc) {
1588		netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1589		return rc;
1590	}
1591
1592	ether_addr_copy(dev->dev_addr, addr->sa_data);
1593
1594	return 0;
1595}
1596
1597static const struct net_device_ops ibmveth_netdev_ops = {
1598	.ndo_open		= ibmveth_open,
1599	.ndo_stop		= ibmveth_close,
1600	.ndo_start_xmit		= ibmveth_start_xmit,
1601	.ndo_set_rx_mode	= ibmveth_set_multicast_list,
1602	.ndo_do_ioctl		= ibmveth_ioctl,
1603	.ndo_change_mtu		= ibmveth_change_mtu,
1604	.ndo_fix_features	= ibmveth_fix_features,
1605	.ndo_set_features	= ibmveth_set_features,
1606	.ndo_validate_addr	= eth_validate_addr,
1607	.ndo_set_mac_address    = ibmveth_set_mac_addr,
1608#ifdef CONFIG_NET_POLL_CONTROLLER
1609	.ndo_poll_controller	= ibmveth_poll_controller,
1610#endif
1611};
1612
1613static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1614{
1615	int rc, i, mac_len;
1616	struct net_device *netdev;
1617	struct ibmveth_adapter *adapter;
1618	unsigned char *mac_addr_p;
1619	unsigned int *mcastFilterSize_p;
1620	long ret;
1621	unsigned long ret_attr;
1622
1623	dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1624		dev->unit_address);
1625
1626	mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1627							&mac_len);
1628	if (!mac_addr_p) {
1629		dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1630		return -EINVAL;
1631	}
1632	/* Workaround for old/broken pHyp */
1633	if (mac_len == 8)
1634		mac_addr_p += 2;
1635	else if (mac_len != 6) {
1636		dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1637			mac_len);
1638		return -EINVAL;
1639	}
1640
1641	mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1642						VETH_MCAST_FILTER_SIZE, NULL);
1643	if (!mcastFilterSize_p) {
1644		dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1645			"attribute\n");
1646		return -EINVAL;
1647	}
1648
1649	netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1650
1651	if (!netdev)
1652		return -ENOMEM;
1653
1654	adapter = netdev_priv(netdev);
1655	dev_set_drvdata(&dev->dev, netdev);
1656
1657	adapter->vdev = dev;
1658	adapter->netdev = netdev;
1659	adapter->mcastFilterSize = *mcastFilterSize_p;
1660	adapter->pool_config = 0;
1661
1662	netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1663
1664	netdev->irq = dev->irq;
1665	netdev->netdev_ops = &ibmveth_netdev_ops;
1666	netdev->ethtool_ops = &netdev_ethtool_ops;
1667	SET_NETDEV_DEV(netdev, &dev->dev);
1668	netdev->hw_features = NETIF_F_SG;
1669	if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1670		netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1671				       NETIF_F_RXCSUM;
1672	}
1673
1674	netdev->features |= netdev->hw_features;
1675
1676	ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1677
1678	/* If running older firmware, TSO should not be enabled by default */
1679	if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1680	    !old_large_send) {
1681		netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1682		netdev->features |= netdev->hw_features;
1683	} else {
1684		netdev->hw_features |= NETIF_F_TSO;
1685	}
1686
1687	adapter->is_active_trunk = false;
1688	if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1689		adapter->is_active_trunk = true;
1690		netdev->hw_features |= NETIF_F_FRAGLIST;
1691		netdev->features |= NETIF_F_FRAGLIST;
1692	}
1693
1694	netdev->min_mtu = IBMVETH_MIN_MTU;
1695	netdev->max_mtu = ETH_MAX_MTU;
1696
1697	memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1698
1699	if (firmware_has_feature(FW_FEATURE_CMO))
1700		memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1701
1702	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1703		struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1704		int error;
1705
1706		ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1707					 pool_count[i], pool_size[i],
1708					 pool_active[i]);
1709		error = kobject_init_and_add(kobj, &ktype_veth_pool,
1710					     &dev->dev.kobj, "pool%d", i);
1711		if (!error)
1712			kobject_uevent(kobj, KOBJ_ADD);
1713	}
1714
1715	netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
 
 
 
 
 
1716	netdev_dbg(netdev, "registering netdev...\n");
1717
1718	ibmveth_set_features(netdev, netdev->features);
1719
1720	rc = register_netdev(netdev);
1721
1722	if (rc) {
1723		netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1724		free_netdev(netdev);
1725		return rc;
1726	}
1727
1728	netdev_dbg(netdev, "registered\n");
1729
1730	return 0;
1731}
1732
1733static int ibmveth_remove(struct vio_dev *dev)
1734{
1735	struct net_device *netdev = dev_get_drvdata(&dev->dev);
1736	struct ibmveth_adapter *adapter = netdev_priv(netdev);
1737	int i;
1738
1739	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1740		kobject_put(&adapter->rx_buff_pool[i].kobj);
1741
1742	unregister_netdev(netdev);
1743
1744	free_netdev(netdev);
1745	dev_set_drvdata(&dev->dev, NULL);
1746
1747	return 0;
1748}
1749
1750static struct attribute veth_active_attr;
1751static struct attribute veth_num_attr;
1752static struct attribute veth_size_attr;
1753
1754static ssize_t veth_pool_show(struct kobject *kobj,
1755			      struct attribute *attr, char *buf)
1756{
1757	struct ibmveth_buff_pool *pool = container_of(kobj,
1758						      struct ibmveth_buff_pool,
1759						      kobj);
1760
1761	if (attr == &veth_active_attr)
1762		return sprintf(buf, "%d\n", pool->active);
1763	else if (attr == &veth_num_attr)
1764		return sprintf(buf, "%d\n", pool->size);
1765	else if (attr == &veth_size_attr)
1766		return sprintf(buf, "%d\n", pool->buff_size);
1767	return 0;
1768}
1769
1770static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1771			       const char *buf, size_t count)
1772{
1773	struct ibmveth_buff_pool *pool = container_of(kobj,
1774						      struct ibmveth_buff_pool,
1775						      kobj);
1776	struct net_device *netdev = dev_get_drvdata(
1777	    container_of(kobj->parent, struct device, kobj));
1778	struct ibmveth_adapter *adapter = netdev_priv(netdev);
1779	long value = simple_strtol(buf, NULL, 10);
1780	long rc;
1781
1782	if (attr == &veth_active_attr) {
1783		if (value && !pool->active) {
1784			if (netif_running(netdev)) {
1785				if (ibmveth_alloc_buffer_pool(pool)) {
1786					netdev_err(netdev,
1787						   "unable to alloc pool\n");
1788					return -ENOMEM;
1789				}
1790				pool->active = 1;
1791				adapter->pool_config = 1;
1792				ibmveth_close(netdev);
1793				adapter->pool_config = 0;
1794				if ((rc = ibmveth_open(netdev)))
1795					return rc;
1796			} else {
1797				pool->active = 1;
1798			}
1799		} else if (!value && pool->active) {
1800			int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1801			int i;
1802			/* Make sure there is a buffer pool with buffers that
1803			   can hold a packet of the size of the MTU */
1804			for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1805				if (pool == &adapter->rx_buff_pool[i])
1806					continue;
1807				if (!adapter->rx_buff_pool[i].active)
1808					continue;
1809				if (mtu <= adapter->rx_buff_pool[i].buff_size)
1810					break;
1811			}
1812
1813			if (i == IBMVETH_NUM_BUFF_POOLS) {
1814				netdev_err(netdev, "no active pool >= MTU\n");
1815				return -EPERM;
1816			}
1817
1818			if (netif_running(netdev)) {
1819				adapter->pool_config = 1;
1820				ibmveth_close(netdev);
1821				pool->active = 0;
1822				adapter->pool_config = 0;
1823				if ((rc = ibmveth_open(netdev)))
1824					return rc;
1825			}
1826			pool->active = 0;
1827		}
1828	} else if (attr == &veth_num_attr) {
1829		if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1830			return -EINVAL;
1831		} else {
1832			if (netif_running(netdev)) {
1833				adapter->pool_config = 1;
1834				ibmveth_close(netdev);
1835				adapter->pool_config = 0;
1836				pool->size = value;
1837				if ((rc = ibmveth_open(netdev)))
1838					return rc;
1839			} else {
1840				pool->size = value;
1841			}
1842		}
1843	} else if (attr == &veth_size_attr) {
1844		if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1845			return -EINVAL;
1846		} else {
1847			if (netif_running(netdev)) {
1848				adapter->pool_config = 1;
1849				ibmveth_close(netdev);
1850				adapter->pool_config = 0;
1851				pool->buff_size = value;
1852				if ((rc = ibmveth_open(netdev)))
1853					return rc;
1854			} else {
1855				pool->buff_size = value;
1856			}
1857		}
1858	}
1859
1860	/* kick the interrupt handler to allocate/deallocate pools */
1861	ibmveth_interrupt(netdev->irq, netdev);
1862	return count;
1863}
1864
1865
1866#define ATTR(_name, _mode)				\
1867	struct attribute veth_##_name##_attr = {	\
1868	.name = __stringify(_name), .mode = _mode,	\
1869	};
1870
1871static ATTR(active, 0644);
1872static ATTR(num, 0644);
1873static ATTR(size, 0644);
1874
1875static struct attribute *veth_pool_attrs[] = {
1876	&veth_active_attr,
1877	&veth_num_attr,
1878	&veth_size_attr,
1879	NULL,
1880};
1881
1882static const struct sysfs_ops veth_pool_ops = {
1883	.show   = veth_pool_show,
1884	.store  = veth_pool_store,
1885};
1886
1887static struct kobj_type ktype_veth_pool = {
1888	.release        = NULL,
1889	.sysfs_ops      = &veth_pool_ops,
1890	.default_attrs  = veth_pool_attrs,
1891};
1892
1893static int ibmveth_resume(struct device *dev)
1894{
1895	struct net_device *netdev = dev_get_drvdata(dev);
1896	ibmveth_interrupt(netdev->irq, netdev);
1897	return 0;
1898}
1899
1900static const struct vio_device_id ibmveth_device_table[] = {
1901	{ "network", "IBM,l-lan"},
1902	{ "", "" }
1903};
1904MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1905
1906static const struct dev_pm_ops ibmveth_pm_ops = {
1907	.resume = ibmveth_resume
1908};
1909
1910static struct vio_driver ibmveth_driver = {
1911	.id_table	= ibmveth_device_table,
1912	.probe		= ibmveth_probe,
1913	.remove		= ibmveth_remove,
1914	.get_desired_dma = ibmveth_get_desired_dma,
1915	.name		= ibmveth_driver_name,
1916	.pm		= &ibmveth_pm_ops,
1917};
1918
1919static int __init ibmveth_module_init(void)
1920{
1921	printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1922	       ibmveth_driver_string, ibmveth_driver_version);
1923
1924	return vio_register_driver(&ibmveth_driver);
1925}
1926
1927static void __exit ibmveth_module_exit(void)
1928{
1929	vio_unregister_driver(&ibmveth_driver);
1930}
1931
1932module_init(ibmveth_module_init);
1933module_exit(ibmveth_module_exit);