1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IBM Power Virtual Ethernet Device Driver
5 * Copyright (C) IBM Corporation, 2003, 2010
7 * Authors: Dave Larson <larson1@us.ibm.com>
8 * Santiago Leon <santil@linux.vnet.ibm.com>
9 * Brian King <brking@linux.vnet.ibm.com>
10 * Robert Jennings <rcj@linux.vnet.ibm.com>
11 * Anton Blanchard <anton@au.ibm.com>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/errno.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/kernel.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/skbuff.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
26 #include <linux/ethtool.h>
29 #include <linux/ipv6.h>
30 #include <linux/slab.h>
31 #include <asm/hvcall.h>
32 #include <linux/atomic.h>
34 #include <asm/iommu.h>
35 #include <asm/firmware.h>
37 #include <net/ip6_checksum.h>
41 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
42 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
43 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
45 static struct kobj_type ktype_veth_pool;
48 static const char ibmveth_driver_name[] = "ibmveth";
49 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
50 #define ibmveth_driver_version "1.06"
52 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
53 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
54 MODULE_LICENSE("GPL");
55 MODULE_VERSION(ibmveth_driver_version);
57 static unsigned int tx_copybreak __read_mostly = 128;
58 module_param(tx_copybreak, uint, 0644);
59 MODULE_PARM_DESC(tx_copybreak,
60 "Maximum size of packet that is copied to a new buffer on transmit");
62 static unsigned int rx_copybreak __read_mostly = 128;
63 module_param(rx_copybreak, uint, 0644);
64 MODULE_PARM_DESC(rx_copybreak,
65 "Maximum size of packet that is copied to a new buffer on receive");
67 static unsigned int rx_flush __read_mostly = 0;
68 module_param(rx_flush, uint, 0644);
69 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
71 static bool old_large_send __read_mostly;
72 module_param(old_large_send, bool, 0444);
73 MODULE_PARM_DESC(old_large_send,
74 "Use old large send method on firmware that supports the new method");
77 char name[ETH_GSTRING_LEN];
81 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
82 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
84 static struct ibmveth_stat ibmveth_stats[] = {
85 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
86 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
87 { "replenish_add_buff_failure",
88 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
89 { "replenish_add_buff_success",
90 IBMVETH_STAT_OFF(replenish_add_buff_success) },
91 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
92 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
93 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
94 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
95 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
96 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
97 { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
98 { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
99 { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
102 /* simple methods of getting data from the current rxq entry */
103 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
105 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
108 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
110 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
111 IBMVETH_RXQ_TOGGLE_SHIFT;
114 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
116 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
119 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
121 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
124 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
126 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
129 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
131 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
134 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
136 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
139 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
141 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
144 static unsigned int ibmveth_real_max_tx_queues(void)
146 unsigned int n_cpu = num_online_cpus();
148 return min(n_cpu, IBMVETH_MAX_QUEUES);
151 /* setup the initial settings for a buffer pool */
152 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
153 u32 pool_index, u32 pool_size,
154 u32 buff_size, u32 pool_active)
156 pool->size = pool_size;
157 pool->index = pool_index;
158 pool->buff_size = buff_size;
159 pool->threshold = pool_size * 7 / 8;
160 pool->active = pool_active;
163 /* allocate and setup an buffer pool - called during open */
164 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
168 pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
173 pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
174 if (!pool->dma_addr) {
175 kfree(pool->free_map);
176 pool->free_map = NULL;
180 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
183 kfree(pool->dma_addr);
184 pool->dma_addr = NULL;
186 kfree(pool->free_map);
187 pool->free_map = NULL;
191 for (i = 0; i < pool->size; ++i)
192 pool->free_map[i] = i;
194 atomic_set(&pool->available, 0);
195 pool->producer_index = 0;
196 pool->consumer_index = 0;
201 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
203 unsigned long offset;
205 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
206 asm("dcbf %0,%1,1" :: "b" (addr), "r" (offset));
209 /* replenish the buffers for a pool. note that we don't need to
210 * skb_reserve these since they are used for incoming...
212 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
213 struct ibmveth_buff_pool *pool)
216 u32 count = pool->size - atomic_read(&pool->available);
217 u32 buffers_added = 0;
219 unsigned int free_index, index;
221 unsigned long lpar_rc;
226 for (i = 0; i < count; ++i) {
227 union ibmveth_buf_desc desc;
229 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
232 netdev_dbg(adapter->netdev,
233 "replenish: unable to allocate skb\n");
234 adapter->replenish_no_mem++;
238 free_index = pool->consumer_index;
239 pool->consumer_index++;
240 if (pool->consumer_index >= pool->size)
241 pool->consumer_index = 0;
242 index = pool->free_map[free_index];
244 BUG_ON(index == IBM_VETH_INVALID_MAP);
245 BUG_ON(pool->skbuff[index] != NULL);
247 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
248 pool->buff_size, DMA_FROM_DEVICE);
250 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
253 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
254 pool->dma_addr[index] = dma_addr;
255 pool->skbuff[index] = skb;
257 correlator = ((u64)pool->index << 32) | index;
258 *(u64 *)skb->data = correlator;
260 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
261 desc.fields.address = dma_addr;
264 unsigned int len = min(pool->buff_size,
265 adapter->netdev->mtu +
267 ibmveth_flush_buffer(skb->data, len);
269 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
272 if (lpar_rc != H_SUCCESS) {
276 adapter->replenish_add_buff_success++;
281 atomic_add(buffers_added, &(pool->available));
285 pool->free_map[free_index] = index;
286 pool->skbuff[index] = NULL;
287 if (pool->consumer_index == 0)
288 pool->consumer_index = pool->size - 1;
290 pool->consumer_index--;
291 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
292 dma_unmap_single(&adapter->vdev->dev,
293 pool->dma_addr[index], pool->buff_size,
295 dev_kfree_skb_any(skb);
296 adapter->replenish_add_buff_failure++;
299 atomic_add(buffers_added, &(pool->available));
303 * The final 8 bytes of the buffer list is a counter of frames dropped
304 * because there was not a buffer in the buffer list capable of holding
307 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
309 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
311 adapter->rx_no_buffer = be64_to_cpup(p);
314 /* replenish routine */
315 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
319 adapter->replenish_task_cycles++;
321 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
322 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
325 (atomic_read(&pool->available) < pool->threshold))
326 ibmveth_replenish_buffer_pool(adapter, pool);
329 ibmveth_update_rx_no_buffer(adapter);
332 /* empty and free ana buffer pool - also used to do cleanup in error paths */
333 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
334 struct ibmveth_buff_pool *pool)
338 kfree(pool->free_map);
339 pool->free_map = NULL;
341 if (pool->skbuff && pool->dma_addr) {
342 for (i = 0; i < pool->size; ++i) {
343 struct sk_buff *skb = pool->skbuff[i];
345 dma_unmap_single(&adapter->vdev->dev,
349 dev_kfree_skb_any(skb);
350 pool->skbuff[i] = NULL;
355 if (pool->dma_addr) {
356 kfree(pool->dma_addr);
357 pool->dma_addr = NULL;
366 /* remove a buffer from a pool */
367 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
370 unsigned int pool = correlator >> 32;
371 unsigned int index = correlator & 0xffffffffUL;
372 unsigned int free_index;
375 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
376 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
378 skb = adapter->rx_buff_pool[pool].skbuff[index];
382 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
384 dma_unmap_single(&adapter->vdev->dev,
385 adapter->rx_buff_pool[pool].dma_addr[index],
386 adapter->rx_buff_pool[pool].buff_size,
389 free_index = adapter->rx_buff_pool[pool].producer_index;
390 adapter->rx_buff_pool[pool].producer_index++;
391 if (adapter->rx_buff_pool[pool].producer_index >=
392 adapter->rx_buff_pool[pool].size)
393 adapter->rx_buff_pool[pool].producer_index = 0;
394 adapter->rx_buff_pool[pool].free_map[free_index] = index;
398 atomic_dec(&(adapter->rx_buff_pool[pool].available));
401 /* get the current buffer on the rx queue */
402 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
404 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
405 unsigned int pool = correlator >> 32;
406 unsigned int index = correlator & 0xffffffffUL;
408 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
409 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
411 return adapter->rx_buff_pool[pool].skbuff[index];
414 /* recycle the current buffer on the rx queue */
415 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
417 u32 q_index = adapter->rx_queue.index;
418 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
419 unsigned int pool = correlator >> 32;
420 unsigned int index = correlator & 0xffffffffUL;
421 union ibmveth_buf_desc desc;
422 unsigned long lpar_rc;
425 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
426 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
428 if (!adapter->rx_buff_pool[pool].active) {
429 ibmveth_rxq_harvest_buffer(adapter);
430 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
434 desc.fields.flags_len = IBMVETH_BUF_VALID |
435 adapter->rx_buff_pool[pool].buff_size;
436 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
438 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
440 if (lpar_rc != H_SUCCESS) {
441 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
442 "during recycle rc=%ld", lpar_rc);
443 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
447 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
448 adapter->rx_queue.index = 0;
449 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
456 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
458 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
460 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
461 adapter->rx_queue.index = 0;
462 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
466 static void ibmveth_free_tx_ltb(struct ibmveth_adapter *adapter, int idx)
468 dma_unmap_single(&adapter->vdev->dev, adapter->tx_ltb_dma[idx],
469 adapter->tx_ltb_size, DMA_TO_DEVICE);
470 kfree(adapter->tx_ltb_ptr[idx]);
471 adapter->tx_ltb_ptr[idx] = NULL;
474 static int ibmveth_allocate_tx_ltb(struct ibmveth_adapter *adapter, int idx)
476 adapter->tx_ltb_ptr[idx] = kzalloc(adapter->tx_ltb_size,
478 if (!adapter->tx_ltb_ptr[idx]) {
479 netdev_err(adapter->netdev,
480 "unable to allocate tx long term buffer\n");
483 adapter->tx_ltb_dma[idx] = dma_map_single(&adapter->vdev->dev,
484 adapter->tx_ltb_ptr[idx],
485 adapter->tx_ltb_size,
487 if (dma_mapping_error(&adapter->vdev->dev, adapter->tx_ltb_dma[idx])) {
488 netdev_err(adapter->netdev,
489 "unable to DMA map tx long term buffer\n");
490 kfree(adapter->tx_ltb_ptr[idx]);
491 adapter->tx_ltb_ptr[idx] = NULL;
498 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
499 union ibmveth_buf_desc rxq_desc, u64 mac_address)
501 int rc, try_again = 1;
504 * After a kexec the adapter will still be open, so our attempt to
505 * open it will fail. So if we get a failure we free the adapter and
506 * try again, but only once.
509 rc = h_register_logical_lan(adapter->vdev->unit_address,
510 adapter->buffer_list_dma, rxq_desc.desc,
511 adapter->filter_list_dma, mac_address);
513 if (rc != H_SUCCESS && try_again) {
515 rc = h_free_logical_lan(adapter->vdev->unit_address);
516 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
525 static int ibmveth_open(struct net_device *netdev)
527 struct ibmveth_adapter *adapter = netdev_priv(netdev);
530 unsigned long lpar_rc;
532 union ibmveth_buf_desc rxq_desc;
536 netdev_dbg(netdev, "open starting\n");
538 napi_enable(&adapter->napi);
540 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
541 rxq_entries += adapter->rx_buff_pool[i].size;
544 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
545 if (!adapter->buffer_list_addr) {
546 netdev_err(netdev, "unable to allocate list pages\n");
550 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
551 if (!adapter->filter_list_addr) {
552 netdev_err(netdev, "unable to allocate filter pages\n");
553 goto out_free_buffer_list;
556 dev = &adapter->vdev->dev;
558 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
560 adapter->rx_queue.queue_addr =
561 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
562 &adapter->rx_queue.queue_dma, GFP_KERNEL);
563 if (!adapter->rx_queue.queue_addr)
564 goto out_free_filter_list;
566 adapter->buffer_list_dma = dma_map_single(dev,
567 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
568 if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
569 netdev_err(netdev, "unable to map buffer list pages\n");
570 goto out_free_queue_mem;
573 adapter->filter_list_dma = dma_map_single(dev,
574 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
575 if (dma_mapping_error(dev, adapter->filter_list_dma)) {
576 netdev_err(netdev, "unable to map filter list pages\n");
577 goto out_unmap_buffer_list;
580 for (i = 0; i < netdev->real_num_tx_queues; i++) {
581 if (ibmveth_allocate_tx_ltb(adapter, i))
582 goto out_free_tx_ltb;
585 adapter->rx_queue.index = 0;
586 adapter->rx_queue.num_slots = rxq_entries;
587 adapter->rx_queue.toggle = 1;
589 mac_address = ether_addr_to_u64(netdev->dev_addr);
591 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
592 adapter->rx_queue.queue_len;
593 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
595 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
596 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
597 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
599 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
601 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
603 if (lpar_rc != H_SUCCESS) {
604 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
606 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
607 "desc:0x%llx MAC:0x%llx\n",
608 adapter->buffer_list_dma,
609 adapter->filter_list_dma,
613 goto out_unmap_filter_list;
616 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
617 if (!adapter->rx_buff_pool[i].active)
619 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
620 netdev_err(netdev, "unable to alloc pool\n");
621 adapter->rx_buff_pool[i].active = 0;
623 goto out_free_buffer_pools;
627 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
628 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
631 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
634 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
635 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
637 goto out_free_buffer_pools;
642 netdev_dbg(netdev, "initial replenish cycle\n");
643 ibmveth_interrupt(netdev->irq, netdev);
645 netif_tx_start_all_queues(netdev);
647 netdev_dbg(netdev, "open complete\n");
651 out_free_buffer_pools:
653 if (adapter->rx_buff_pool[i].active)
654 ibmveth_free_buffer_pool(adapter,
655 &adapter->rx_buff_pool[i]);
657 out_unmap_filter_list:
658 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
663 ibmveth_free_tx_ltb(adapter, i);
666 out_unmap_buffer_list:
667 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
670 dma_free_coherent(dev, adapter->rx_queue.queue_len,
671 adapter->rx_queue.queue_addr,
672 adapter->rx_queue.queue_dma);
673 out_free_filter_list:
674 free_page((unsigned long)adapter->filter_list_addr);
675 out_free_buffer_list:
676 free_page((unsigned long)adapter->buffer_list_addr);
678 napi_disable(&adapter->napi);
682 static int ibmveth_close(struct net_device *netdev)
684 struct ibmveth_adapter *adapter = netdev_priv(netdev);
685 struct device *dev = &adapter->vdev->dev;
689 netdev_dbg(netdev, "close starting\n");
691 napi_disable(&adapter->napi);
693 netif_tx_stop_all_queues(netdev);
695 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
698 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
699 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
701 if (lpar_rc != H_SUCCESS) {
702 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
703 "continuing with close\n", lpar_rc);
706 free_irq(netdev->irq, netdev);
708 ibmveth_update_rx_no_buffer(adapter);
710 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
712 free_page((unsigned long)adapter->buffer_list_addr);
714 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
716 free_page((unsigned long)adapter->filter_list_addr);
718 dma_free_coherent(dev, adapter->rx_queue.queue_len,
719 adapter->rx_queue.queue_addr,
720 adapter->rx_queue.queue_dma);
722 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
723 if (adapter->rx_buff_pool[i].active)
724 ibmveth_free_buffer_pool(adapter,
725 &adapter->rx_buff_pool[i]);
727 for (i = 0; i < netdev->real_num_tx_queues; i++)
728 ibmveth_free_tx_ltb(adapter, i);
730 netdev_dbg(netdev, "close complete\n");
735 static int ibmveth_set_link_ksettings(struct net_device *dev,
736 const struct ethtool_link_ksettings *cmd)
738 struct ibmveth_adapter *adapter = netdev_priv(dev);
740 return ethtool_virtdev_set_link_ksettings(dev, cmd,
745 static int ibmveth_get_link_ksettings(struct net_device *dev,
746 struct ethtool_link_ksettings *cmd)
748 struct ibmveth_adapter *adapter = netdev_priv(dev);
750 cmd->base.speed = adapter->speed;
751 cmd->base.duplex = adapter->duplex;
752 cmd->base.port = PORT_OTHER;
757 static void ibmveth_init_link_settings(struct net_device *dev)
759 struct ibmveth_adapter *adapter = netdev_priv(dev);
761 adapter->speed = SPEED_1000;
762 adapter->duplex = DUPLEX_FULL;
765 static void netdev_get_drvinfo(struct net_device *dev,
766 struct ethtool_drvinfo *info)
768 strscpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
769 strscpy(info->version, ibmveth_driver_version, sizeof(info->version));
772 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
773 netdev_features_t features)
776 * Since the ibmveth firmware interface does not have the
777 * concept of separate tx/rx checksum offload enable, if rx
778 * checksum is disabled we also have to disable tx checksum
779 * offload. Once we disable rx checksum offload, we are no
780 * longer allowed to send tx buffers that are not properly
784 if (!(features & NETIF_F_RXCSUM))
785 features &= ~NETIF_F_CSUM_MASK;
790 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
792 struct ibmveth_adapter *adapter = netdev_priv(dev);
793 unsigned long set_attr, clr_attr, ret_attr;
794 unsigned long set_attr6, clr_attr6;
795 long ret, ret4, ret6;
796 int rc1 = 0, rc2 = 0;
799 if (netif_running(dev)) {
810 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
811 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
813 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
814 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
817 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
819 if (ret == H_SUCCESS &&
820 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
821 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
822 set_attr, &ret_attr);
824 if (ret4 != H_SUCCESS) {
825 netdev_err(dev, "unable to change IPv4 checksum "
826 "offload settings. %d rc=%ld\n",
829 h_illan_attributes(adapter->vdev->unit_address,
830 set_attr, clr_attr, &ret_attr);
833 dev->features &= ~NETIF_F_IP_CSUM;
836 adapter->fw_ipv4_csum_support = data;
839 ret6 = h_illan_attributes(adapter->vdev->unit_address,
840 clr_attr6, set_attr6, &ret_attr);
842 if (ret6 != H_SUCCESS) {
843 netdev_err(dev, "unable to change IPv6 checksum "
844 "offload settings. %d rc=%ld\n",
847 h_illan_attributes(adapter->vdev->unit_address,
848 set_attr6, clr_attr6, &ret_attr);
851 dev->features &= ~NETIF_F_IPV6_CSUM;
854 adapter->fw_ipv6_csum_support = data;
856 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
857 adapter->rx_csum = data;
862 netdev_err(dev, "unable to change checksum offload settings."
863 " %d rc=%ld ret_attr=%lx\n", data, ret,
868 rc2 = ibmveth_open(dev);
870 return rc1 ? rc1 : rc2;
873 static int ibmveth_set_tso(struct net_device *dev, u32 data)
875 struct ibmveth_adapter *adapter = netdev_priv(dev);
876 unsigned long set_attr, clr_attr, ret_attr;
878 int rc1 = 0, rc2 = 0;
881 if (netif_running(dev)) {
890 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
892 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
894 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
896 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
898 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
899 set_attr, &ret_attr);
901 if (ret2 != H_SUCCESS) {
902 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
905 h_illan_attributes(adapter->vdev->unit_address,
906 set_attr, clr_attr, &ret_attr);
909 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
913 adapter->fw_large_send_support = data;
914 adapter->large_send = data;
917 /* Older firmware version of large send offload does not
921 dev->features &= ~NETIF_F_TSO6;
922 netdev_info(dev, "TSO feature requires all partitions to have updated driver");
924 adapter->large_send = data;
928 rc2 = ibmveth_open(dev);
930 return rc1 ? rc1 : rc2;
933 static int ibmveth_set_features(struct net_device *dev,
934 netdev_features_t features)
936 struct ibmveth_adapter *adapter = netdev_priv(dev);
937 int rx_csum = !!(features & NETIF_F_RXCSUM);
938 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
939 int rc1 = 0, rc2 = 0;
941 if (rx_csum != adapter->rx_csum) {
942 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
943 if (rc1 && !adapter->rx_csum)
945 features & ~(NETIF_F_CSUM_MASK |
949 if (large_send != adapter->large_send) {
950 rc2 = ibmveth_set_tso(dev, large_send);
951 if (rc2 && !adapter->large_send)
953 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
956 return rc1 ? rc1 : rc2;
959 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
963 if (stringset != ETH_SS_STATS)
966 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
967 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
970 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
974 return ARRAY_SIZE(ibmveth_stats);
980 static void ibmveth_get_ethtool_stats(struct net_device *dev,
981 struct ethtool_stats *stats, u64 *data)
984 struct ibmveth_adapter *adapter = netdev_priv(dev);
986 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
987 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
990 static void ibmveth_get_channels(struct net_device *netdev,
991 struct ethtool_channels *channels)
993 channels->max_tx = ibmveth_real_max_tx_queues();
994 channels->tx_count = netdev->real_num_tx_queues;
996 channels->max_rx = netdev->real_num_rx_queues;
997 channels->rx_count = netdev->real_num_rx_queues;
1000 static int ibmveth_set_channels(struct net_device *netdev,
1001 struct ethtool_channels *channels)
1003 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1004 unsigned int old = netdev->real_num_tx_queues,
1005 goal = channels->tx_count;
1008 /* If ndo_open has not been called yet then don't allocate, just set
1009 * desired netdev_queue's and return
1011 if (!(netdev->flags & IFF_UP))
1012 return netif_set_real_num_tx_queues(netdev, goal);
1014 /* We have IBMVETH_MAX_QUEUES netdev_queue's allocated
1015 * but we may need to alloc/free the ltb's.
1017 netif_tx_stop_all_queues(netdev);
1019 /* Allocate any queue that we need */
1020 for (i = old; i < goal; i++) {
1021 if (adapter->tx_ltb_ptr[i])
1024 rc = ibmveth_allocate_tx_ltb(adapter, i);
1028 /* if something goes wrong, free everything we just allocated */
1029 netdev_err(netdev, "Failed to allocate more tx queues, returning to %d queues\n",
1035 rc = netif_set_real_num_tx_queues(netdev, goal);
1037 netdev_err(netdev, "Failed to set real tx queues, returning to %d queues\n",
1042 /* Free any that are no longer needed */
1043 for (i = old; i > goal; i--) {
1044 if (adapter->tx_ltb_ptr[i - 1])
1045 ibmveth_free_tx_ltb(adapter, i - 1);
1048 netif_tx_wake_all_queues(netdev);
1053 static const struct ethtool_ops netdev_ethtool_ops = {
1054 .get_drvinfo = netdev_get_drvinfo,
1055 .get_link = ethtool_op_get_link,
1056 .get_strings = ibmveth_get_strings,
1057 .get_sset_count = ibmveth_get_sset_count,
1058 .get_ethtool_stats = ibmveth_get_ethtool_stats,
1059 .get_link_ksettings = ibmveth_get_link_ksettings,
1060 .set_link_ksettings = ibmveth_set_link_ksettings,
1061 .get_channels = ibmveth_get_channels,
1062 .set_channels = ibmveth_set_channels
1065 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1070 static int ibmveth_send(struct ibmveth_adapter *adapter,
1071 unsigned long desc, unsigned long mss)
1073 unsigned long correlator;
1074 unsigned int retry_count;
1078 * The retry count sets a maximum for the number of broadcast and
1079 * multicast destinations within the system.
1084 ret = h_send_logical_lan(adapter->vdev->unit_address, desc,
1085 correlator, &correlator, mss,
1086 adapter->fw_large_send_support);
1087 } while ((ret == H_BUSY) && (retry_count--));
1089 if (ret != H_SUCCESS && ret != H_DROPPED) {
1090 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1091 "with rc=%ld\n", ret);
1098 static int ibmveth_is_packet_unsupported(struct sk_buff *skb,
1099 struct net_device *netdev)
1101 struct ethhdr *ether_header;
1104 ether_header = eth_hdr(skb);
1106 if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) {
1107 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n");
1108 netdev->stats.tx_dropped++;
1115 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1116 struct net_device *netdev)
1118 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1119 unsigned int desc_flags, total_bytes;
1120 union ibmveth_buf_desc desc;
1121 int i, queue_num = skb_get_queue_mapping(skb);
1122 unsigned long mss = 0;
1124 if (ibmveth_is_packet_unsupported(skb, netdev))
1126 /* veth can't checksum offload UDP */
1127 if (skb->ip_summed == CHECKSUM_PARTIAL &&
1128 ((skb->protocol == htons(ETH_P_IP) &&
1129 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1130 (skb->protocol == htons(ETH_P_IPV6) &&
1131 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1132 skb_checksum_help(skb)) {
1134 netdev_err(netdev, "tx: failed to checksum packet\n");
1135 netdev->stats.tx_dropped++;
1139 desc_flags = IBMVETH_BUF_VALID;
1141 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1142 unsigned char *buf = skb_transport_header(skb) +
1145 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1147 /* Need to zero out the checksum */
1151 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1152 desc_flags |= IBMVETH_BUF_LRG_SND;
1155 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1156 if (adapter->fw_large_send_support) {
1157 mss = (unsigned long)skb_shinfo(skb)->gso_size;
1158 adapter->tx_large_packets++;
1159 } else if (!skb_is_gso_v6(skb)) {
1160 /* Put -1 in the IP checksum to tell phyp it
1161 * is a largesend packet. Put the mss in
1164 ip_hdr(skb)->check = 0xffff;
1165 tcp_hdr(skb)->check =
1166 cpu_to_be16(skb_shinfo(skb)->gso_size);
1167 adapter->tx_large_packets++;
1171 /* Copy header into mapped buffer */
1172 if (unlikely(skb->len > adapter->tx_ltb_size)) {
1173 netdev_err(adapter->netdev, "tx: packet size (%u) exceeds ltb (%u)\n",
1174 skb->len, adapter->tx_ltb_size);
1175 netdev->stats.tx_dropped++;
1178 memcpy(adapter->tx_ltb_ptr[queue_num], skb->data, skb_headlen(skb));
1179 total_bytes = skb_headlen(skb);
1180 /* Copy frags into mapped buffers */
1181 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1182 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1184 memcpy(adapter->tx_ltb_ptr[queue_num] + total_bytes,
1185 skb_frag_address_safe(frag), skb_frag_size(frag));
1186 total_bytes += skb_frag_size(frag);
1189 if (unlikely(total_bytes != skb->len)) {
1190 netdev_err(adapter->netdev, "tx: incorrect packet len copied into ltb (%u != %u)\n",
1191 skb->len, total_bytes);
1192 netdev->stats.tx_dropped++;
1195 desc.fields.flags_len = desc_flags | skb->len;
1196 desc.fields.address = adapter->tx_ltb_dma[queue_num];
1197 /* finish writing to long_term_buff before VIOS accessing it */
1200 if (ibmveth_send(adapter, desc.desc, mss)) {
1201 adapter->tx_send_failed++;
1202 netdev->stats.tx_dropped++;
1204 netdev->stats.tx_packets++;
1205 netdev->stats.tx_bytes += skb->len;
1209 dev_consume_skb_any(skb);
1210 return NETDEV_TX_OK;
1215 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1217 struct tcphdr *tcph;
1221 /* only TCP packets will be aggregated */
1222 if (skb->protocol == htons(ETH_P_IP)) {
1223 struct iphdr *iph = (struct iphdr *)skb->data;
1225 if (iph->protocol == IPPROTO_TCP) {
1226 offset = iph->ihl * 4;
1227 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1231 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1232 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1234 if (iph6->nexthdr == IPPROTO_TCP) {
1235 offset = sizeof(struct ipv6hdr);
1236 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1243 /* if mss is not set through Large Packet bit/mss in rx buffer,
1244 * expect that the mss will be written to the tcp header checksum.
1246 tcph = (struct tcphdr *)(skb->data + offset);
1248 skb_shinfo(skb)->gso_size = mss;
1249 } else if (offset) {
1250 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1254 if (skb_shinfo(skb)->gso_size) {
1255 hdr_len = offset + tcph->doff * 4;
1256 skb_shinfo(skb)->gso_segs =
1257 DIV_ROUND_UP(skb->len - hdr_len,
1258 skb_shinfo(skb)->gso_size);
1262 static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1263 struct ibmveth_adapter *adapter)
1265 struct iphdr *iph = NULL;
1266 struct ipv6hdr *iph6 = NULL;
1267 __be16 skb_proto = 0;
1272 skb_proto = be16_to_cpu(skb->protocol);
1274 if (skb_proto == ETH_P_IP) {
1275 iph = (struct iphdr *)skb->data;
1277 /* If the IP checksum is not offloaded and if the packet
1278 * is large send, the checksum must be rebuilt.
1280 if (iph->check == 0xffff) {
1282 iph->check = ip_fast_csum((unsigned char *)iph,
1286 iphlen = iph->ihl * 4;
1287 iph_proto = iph->protocol;
1288 } else if (skb_proto == ETH_P_IPV6) {
1289 iph6 = (struct ipv6hdr *)skb->data;
1290 iphlen = sizeof(struct ipv6hdr);
1291 iph_proto = iph6->nexthdr;
1294 /* When CSO is enabled the TCP checksum may have be set to NULL by
1295 * the sender given that we zeroed out TCP checksum field in
1296 * transmit path (refer ibmveth_start_xmit routine). In this case set
1297 * up CHECKSUM_PARTIAL. If the packet is forwarded, the checksum will
1298 * then be recalculated by the destination NIC (CSO must be enabled
1299 * on the destination NIC).
1301 * In an OVS environment, when a flow is not cached, specifically for a
1302 * new TCP connection, the first packet information is passed up to
1303 * the user space for finding a flow. During this process, OVS computes
1304 * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1306 * So, re-compute TCP pseudo header checksum when configured for
1309 if (iph_proto == IPPROTO_TCP) {
1310 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1311 if (tcph->check == 0x0000) {
1312 /* Recompute TCP pseudo header checksum */
1313 if (adapter->is_active_trunk) {
1314 tcphdrlen = skb->len - iphlen;
1315 if (skb_proto == ETH_P_IP)
1317 ~csum_tcpudp_magic(iph->saddr,
1318 iph->daddr, tcphdrlen, iph_proto, 0);
1319 else if (skb_proto == ETH_P_IPV6)
1321 ~csum_ipv6_magic(&iph6->saddr,
1322 &iph6->daddr, tcphdrlen, iph_proto, 0);
1324 /* Setup SKB fields for checksum offload */
1325 skb_partial_csum_set(skb, iphlen,
1326 offsetof(struct tcphdr, check));
1327 skb_reset_network_header(skb);
1332 static int ibmveth_poll(struct napi_struct *napi, int budget)
1334 struct ibmveth_adapter *adapter =
1335 container_of(napi, struct ibmveth_adapter, napi);
1336 struct net_device *netdev = adapter->netdev;
1337 int frames_processed = 0;
1338 unsigned long lpar_rc;
1341 while (frames_processed < budget) {
1342 if (!ibmveth_rxq_pending_buffer(adapter))
1346 if (!ibmveth_rxq_buffer_valid(adapter)) {
1347 wmb(); /* suggested by larson1 */
1348 adapter->rx_invalid_buffer++;
1349 netdev_dbg(netdev, "recycling invalid buffer\n");
1350 ibmveth_rxq_recycle_buffer(adapter);
1352 struct sk_buff *skb, *new_skb;
1353 int length = ibmveth_rxq_frame_length(adapter);
1354 int offset = ibmveth_rxq_frame_offset(adapter);
1355 int csum_good = ibmveth_rxq_csum_good(adapter);
1356 int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1357 __sum16 iph_check = 0;
1359 skb = ibmveth_rxq_get_buffer(adapter);
1361 /* if the large packet bit is set in the rx queue
1362 * descriptor, the mss will be written by PHYP eight
1363 * bytes from the start of the rx buffer, which is
1364 * skb->data at this stage
1367 __be64 *rxmss = (__be64 *)(skb->data + 8);
1369 mss = (u16)be64_to_cpu(*rxmss);
1373 if (length < rx_copybreak)
1374 new_skb = netdev_alloc_skb(netdev, length);
1377 skb_copy_to_linear_data(new_skb,
1381 ibmveth_flush_buffer(skb->data,
1383 if (!ibmveth_rxq_recycle_buffer(adapter))
1387 ibmveth_rxq_harvest_buffer(adapter);
1388 skb_reserve(skb, offset);
1391 skb_put(skb, length);
1392 skb->protocol = eth_type_trans(skb, netdev);
1394 /* PHYP without PLSO support places a -1 in the ip
1395 * checksum for large send frames.
1397 if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
1398 struct iphdr *iph = (struct iphdr *)skb->data;
1400 iph_check = iph->check;
1403 if ((length > netdev->mtu + ETH_HLEN) ||
1404 lrg_pkt || iph_check == 0xffff) {
1405 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1406 adapter->rx_large_packets++;
1410 skb->ip_summed = CHECKSUM_UNNECESSARY;
1411 ibmveth_rx_csum_helper(skb, adapter);
1414 napi_gro_receive(napi, skb); /* send it up */
1416 netdev->stats.rx_packets++;
1417 netdev->stats.rx_bytes += length;
1422 ibmveth_replenish_task(adapter);
1424 if (frames_processed < budget) {
1425 napi_complete_done(napi, frames_processed);
1427 /* We think we are done - reenable interrupts,
1428 * then check once more to make sure we are done.
1430 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1433 BUG_ON(lpar_rc != H_SUCCESS);
1435 if (ibmveth_rxq_pending_buffer(adapter) &&
1436 napi_reschedule(napi)) {
1437 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1442 return frames_processed;
1445 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1447 struct net_device *netdev = dev_instance;
1448 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1449 unsigned long lpar_rc;
1451 if (napi_schedule_prep(&adapter->napi)) {
1452 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1454 BUG_ON(lpar_rc != H_SUCCESS);
1455 __napi_schedule(&adapter->napi);
1460 static void ibmveth_set_multicast_list(struct net_device *netdev)
1462 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1463 unsigned long lpar_rc;
1465 if ((netdev->flags & IFF_PROMISC) ||
1466 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1467 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1468 IbmVethMcastEnableRecv |
1469 IbmVethMcastDisableFiltering,
1471 if (lpar_rc != H_SUCCESS) {
1472 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1473 "entering promisc mode\n", lpar_rc);
1476 struct netdev_hw_addr *ha;
1477 /* clear the filter table & disable filtering */
1478 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1479 IbmVethMcastEnableRecv |
1480 IbmVethMcastDisableFiltering |
1481 IbmVethMcastClearFilterTable,
1483 if (lpar_rc != H_SUCCESS) {
1484 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1485 "attempting to clear filter table\n",
1488 /* add the addresses to the filter table */
1489 netdev_for_each_mc_addr(ha, netdev) {
1490 /* add the multicast address to the filter table */
1492 mcast_addr = ether_addr_to_u64(ha->addr);
1493 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1494 IbmVethMcastAddFilter,
1496 if (lpar_rc != H_SUCCESS) {
1497 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1498 "when adding an entry to the filter "
1499 "table\n", lpar_rc);
1503 /* re-enable filtering */
1504 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1505 IbmVethMcastEnableFiltering,
1507 if (lpar_rc != H_SUCCESS) {
1508 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1509 "enabling filtering\n", lpar_rc);
1514 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1516 struct ibmveth_adapter *adapter = netdev_priv(dev);
1517 struct vio_dev *viodev = adapter->vdev;
1518 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1520 int need_restart = 0;
1522 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1523 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1526 if (i == IBMVETH_NUM_BUFF_POOLS)
1529 /* Deactivate all the buffer pools so that the next loop can activate
1530 only the buffer pools necessary to hold the new MTU */
1531 if (netif_running(adapter->netdev)) {
1533 ibmveth_close(adapter->netdev);
1536 /* Look for an active buffer pool that can hold the new MTU */
1537 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1538 adapter->rx_buff_pool[i].active = 1;
1540 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1542 vio_cmo_set_dev_desired(viodev,
1543 ibmveth_get_desired_dma
1546 return ibmveth_open(adapter->netdev);
1552 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1558 #ifdef CONFIG_NET_POLL_CONTROLLER
1559 static void ibmveth_poll_controller(struct net_device *dev)
1561 ibmveth_replenish_task(netdev_priv(dev));
1562 ibmveth_interrupt(dev->irq, dev);
1567 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1569 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1572 * Number of bytes of IO data the driver will need to perform well.
1574 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1576 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1577 struct ibmveth_adapter *adapter;
1578 struct iommu_table *tbl;
1583 tbl = get_iommu_table_base(&vdev->dev);
1585 /* netdev inits at probe time along with the structures we need below*/
1587 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1589 adapter = netdev_priv(netdev);
1591 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1592 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1593 /* add size of mapped tx buffers */
1594 ret += IOMMU_PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE, tbl);
1596 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1597 /* add the size of the active receive buffers */
1598 if (adapter->rx_buff_pool[i].active)
1600 adapter->rx_buff_pool[i].size *
1601 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1603 rxqentries += adapter->rx_buff_pool[i].size;
1605 /* add the size of the receive queue entries */
1606 ret += IOMMU_PAGE_ALIGN(
1607 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1612 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1614 struct ibmveth_adapter *adapter = netdev_priv(dev);
1615 struct sockaddr *addr = p;
1619 if (!is_valid_ether_addr(addr->sa_data))
1620 return -EADDRNOTAVAIL;
1622 mac_address = ether_addr_to_u64(addr->sa_data);
1623 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1625 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1629 eth_hw_addr_set(dev, addr->sa_data);
1634 static const struct net_device_ops ibmveth_netdev_ops = {
1635 .ndo_open = ibmveth_open,
1636 .ndo_stop = ibmveth_close,
1637 .ndo_start_xmit = ibmveth_start_xmit,
1638 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1639 .ndo_eth_ioctl = ibmveth_ioctl,
1640 .ndo_change_mtu = ibmveth_change_mtu,
1641 .ndo_fix_features = ibmveth_fix_features,
1642 .ndo_set_features = ibmveth_set_features,
1643 .ndo_validate_addr = eth_validate_addr,
1644 .ndo_set_mac_address = ibmveth_set_mac_addr,
1645 #ifdef CONFIG_NET_POLL_CONTROLLER
1646 .ndo_poll_controller = ibmveth_poll_controller,
1650 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1653 struct net_device *netdev;
1654 struct ibmveth_adapter *adapter;
1655 unsigned char *mac_addr_p;
1656 __be32 *mcastFilterSize_p;
1658 unsigned long ret_attr;
1660 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1663 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1666 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1669 /* Workaround for old/broken pHyp */
1672 else if (mac_len != 6) {
1673 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1678 mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1679 VETH_MCAST_FILTER_SIZE,
1681 if (!mcastFilterSize_p) {
1682 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1687 netdev = alloc_etherdev_mqs(sizeof(struct ibmveth_adapter), IBMVETH_MAX_QUEUES, 1);
1691 adapter = netdev_priv(netdev);
1692 dev_set_drvdata(&dev->dev, netdev);
1694 adapter->vdev = dev;
1695 adapter->netdev = netdev;
1696 adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1697 ibmveth_init_link_settings(netdev);
1699 netif_napi_add_weight(netdev, &adapter->napi, ibmveth_poll, 16);
1701 netdev->irq = dev->irq;
1702 netdev->netdev_ops = &ibmveth_netdev_ops;
1703 netdev->ethtool_ops = &netdev_ethtool_ops;
1704 SET_NETDEV_DEV(netdev, &dev->dev);
1705 netdev->hw_features = NETIF_F_SG;
1706 if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1707 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1711 netdev->features |= netdev->hw_features;
1713 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1715 /* If running older firmware, TSO should not be enabled by default */
1716 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1718 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1719 netdev->features |= netdev->hw_features;
1721 netdev->hw_features |= NETIF_F_TSO;
1724 adapter->is_active_trunk = false;
1725 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1726 adapter->is_active_trunk = true;
1727 netdev->hw_features |= NETIF_F_FRAGLIST;
1728 netdev->features |= NETIF_F_FRAGLIST;
1731 netdev->min_mtu = IBMVETH_MIN_MTU;
1732 netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
1734 eth_hw_addr_set(netdev, mac_addr_p);
1736 if (firmware_has_feature(FW_FEATURE_CMO))
1737 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1739 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1740 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1743 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1744 pool_count[i], pool_size[i],
1746 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1747 &dev->dev.kobj, "pool%d", i);
1749 kobject_uevent(kobj, KOBJ_ADD);
1752 rc = netif_set_real_num_tx_queues(netdev, min(num_online_cpus(),
1753 IBMVETH_DEFAULT_QUEUES));
1755 netdev_dbg(netdev, "failed to set number of tx queues rc=%d\n",
1757 free_netdev(netdev);
1760 adapter->tx_ltb_size = PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE);
1761 for (i = 0; i < IBMVETH_MAX_QUEUES; i++)
1762 adapter->tx_ltb_ptr[i] = NULL;
1764 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1765 netdev_dbg(netdev, "registering netdev...\n");
1767 ibmveth_set_features(netdev, netdev->features);
1769 rc = register_netdev(netdev);
1772 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1773 free_netdev(netdev);
1777 netdev_dbg(netdev, "registered\n");
1782 static void ibmveth_remove(struct vio_dev *dev)
1784 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1785 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1788 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1789 kobject_put(&adapter->rx_buff_pool[i].kobj);
1791 unregister_netdev(netdev);
1793 free_netdev(netdev);
1794 dev_set_drvdata(&dev->dev, NULL);
1797 static struct attribute veth_active_attr;
1798 static struct attribute veth_num_attr;
1799 static struct attribute veth_size_attr;
1801 static ssize_t veth_pool_show(struct kobject *kobj,
1802 struct attribute *attr, char *buf)
1804 struct ibmveth_buff_pool *pool = container_of(kobj,
1805 struct ibmveth_buff_pool,
1808 if (attr == &veth_active_attr)
1809 return sprintf(buf, "%d\n", pool->active);
1810 else if (attr == &veth_num_attr)
1811 return sprintf(buf, "%d\n", pool->size);
1812 else if (attr == &veth_size_attr)
1813 return sprintf(buf, "%d\n", pool->buff_size);
1817 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1818 const char *buf, size_t count)
1820 struct ibmveth_buff_pool *pool = container_of(kobj,
1821 struct ibmveth_buff_pool,
1823 struct net_device *netdev = dev_get_drvdata(kobj_to_dev(kobj->parent));
1824 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1825 long value = simple_strtol(buf, NULL, 10);
1828 if (attr == &veth_active_attr) {
1829 if (value && !pool->active) {
1830 if (netif_running(netdev)) {
1831 if (ibmveth_alloc_buffer_pool(pool)) {
1833 "unable to alloc pool\n");
1837 ibmveth_close(netdev);
1838 if ((rc = ibmveth_open(netdev)))
1843 } else if (!value && pool->active) {
1844 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1846 /* Make sure there is a buffer pool with buffers that
1847 can hold a packet of the size of the MTU */
1848 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1849 if (pool == &adapter->rx_buff_pool[i])
1851 if (!adapter->rx_buff_pool[i].active)
1853 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1857 if (i == IBMVETH_NUM_BUFF_POOLS) {
1858 netdev_err(netdev, "no active pool >= MTU\n");
1862 if (netif_running(netdev)) {
1863 ibmveth_close(netdev);
1865 if ((rc = ibmveth_open(netdev)))
1870 } else if (attr == &veth_num_attr) {
1871 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1874 if (netif_running(netdev)) {
1875 ibmveth_close(netdev);
1877 if ((rc = ibmveth_open(netdev)))
1883 } else if (attr == &veth_size_attr) {
1884 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1887 if (netif_running(netdev)) {
1888 ibmveth_close(netdev);
1889 pool->buff_size = value;
1890 if ((rc = ibmveth_open(netdev)))
1893 pool->buff_size = value;
1898 /* kick the interrupt handler to allocate/deallocate pools */
1899 ibmveth_interrupt(netdev->irq, netdev);
1904 #define ATTR(_name, _mode) \
1905 struct attribute veth_##_name##_attr = { \
1906 .name = __stringify(_name), .mode = _mode, \
1909 static ATTR(active, 0644);
1910 static ATTR(num, 0644);
1911 static ATTR(size, 0644);
1913 static struct attribute *veth_pool_attrs[] = {
1919 ATTRIBUTE_GROUPS(veth_pool);
1921 static const struct sysfs_ops veth_pool_ops = {
1922 .show = veth_pool_show,
1923 .store = veth_pool_store,
1926 static struct kobj_type ktype_veth_pool = {
1928 .sysfs_ops = &veth_pool_ops,
1929 .default_groups = veth_pool_groups,
1932 static int ibmveth_resume(struct device *dev)
1934 struct net_device *netdev = dev_get_drvdata(dev);
1935 ibmveth_interrupt(netdev->irq, netdev);
1939 static const struct vio_device_id ibmveth_device_table[] = {
1940 { "network", "IBM,l-lan"},
1943 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1945 static const struct dev_pm_ops ibmveth_pm_ops = {
1946 .resume = ibmveth_resume
1949 static struct vio_driver ibmveth_driver = {
1950 .id_table = ibmveth_device_table,
1951 .probe = ibmveth_probe,
1952 .remove = ibmveth_remove,
1953 .get_desired_dma = ibmveth_get_desired_dma,
1954 .name = ibmveth_driver_name,
1955 .pm = &ibmveth_pm_ops,
1958 static int __init ibmveth_module_init(void)
1960 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1961 ibmveth_driver_string, ibmveth_driver_version);
1963 return vio_register_driver(&ibmveth_driver);
1966 static void __exit ibmveth_module_exit(void)
1968 vio_unregister_driver(&ibmveth_driver);
1971 module_init(ibmveth_module_init);
1972 module_exit(ibmveth_module_exit);