forked from torvalds/linux
/
ibmveth.c
1625 lines (1344 loc) · 43.6 KB
/
ibmveth.c
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/*
* IBM Power Virtual Ethernet Device Driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) IBM Corporation, 2003, 2010
*
* Authors: Dave Larson <larson1@us.ibm.com>
* Santiago Leon <santil@linux.vnet.ibm.com>
* Brian King <brking@linux.vnet.ibm.com>
* Robert Jennings <rcj@linux.vnet.ibm.com>
* Anton Blanchard <anton@au.ibm.com>
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/pm.h>
#include <linux/ethtool.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <asm/hvcall.h>
#include <linux/atomic.h>
#include <asm/vio.h>
#include <asm/iommu.h>
#include <asm/firmware.h>
#include "ibmveth.h"
static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
static struct kobj_type ktype_veth_pool;
static const char ibmveth_driver_name[] = "ibmveth";
static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
#define ibmveth_driver_version "1.04"
MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(ibmveth_driver_version);
static unsigned int tx_copybreak __read_mostly = 128;
module_param(tx_copybreak, uint, 0644);
MODULE_PARM_DESC(tx_copybreak,
"Maximum size of packet that is copied to a new buffer on transmit");
static unsigned int rx_copybreak __read_mostly = 128;
module_param(rx_copybreak, uint, 0644);
MODULE_PARM_DESC(rx_copybreak,
"Maximum size of packet that is copied to a new buffer on receive");
static unsigned int rx_flush __read_mostly = 0;
module_param(rx_flush, uint, 0644);
MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
struct ibmveth_stat {
char name[ETH_GSTRING_LEN];
int offset;
};
#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
struct ibmveth_stat ibmveth_stats[] = {
{ "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
{ "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
{ "replenish_add_buff_failure",
IBMVETH_STAT_OFF(replenish_add_buff_failure) },
{ "replenish_add_buff_success",
IBMVETH_STAT_OFF(replenish_add_buff_success) },
{ "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
{ "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
{ "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
{ "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
{ "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
{ "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
};
/* simple methods of getting data from the current rxq entry */
static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
{
return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
}
static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
{
return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
IBMVETH_RXQ_TOGGLE_SHIFT;
}
static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
{
return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
}
static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
{
return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
}
static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
{
return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
}
static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
{
return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
}
static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
{
return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
}
/* setup the initial settings for a buffer pool */
static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
u32 pool_index, u32 pool_size,
u32 buff_size, u32 pool_active)
{
pool->size = pool_size;
pool->index = pool_index;
pool->buff_size = buff_size;
pool->threshold = pool_size * 7 / 8;
pool->active = pool_active;
}
/* allocate and setup an buffer pool - called during open */
static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
{
int i;
pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
if (!pool->free_map)
return -1;
pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
if (!pool->dma_addr) {
kfree(pool->free_map);
pool->free_map = NULL;
return -1;
}
pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
if (!pool->skbuff) {
kfree(pool->dma_addr);
pool->dma_addr = NULL;
kfree(pool->free_map);
pool->free_map = NULL;
return -1;
}
memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
for (i = 0; i < pool->size; ++i)
pool->free_map[i] = i;
atomic_set(&pool->available, 0);
pool->producer_index = 0;
pool->consumer_index = 0;
return 0;
}
static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
{
unsigned long offset;
for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
}
/* replenish the buffers for a pool. note that we don't need to
* skb_reserve these since they are used for incoming...
*/
static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
struct ibmveth_buff_pool *pool)
{
u32 i;
u32 count = pool->size - atomic_read(&pool->available);
u32 buffers_added = 0;
struct sk_buff *skb;
unsigned int free_index, index;
u64 correlator;
unsigned long lpar_rc;
dma_addr_t dma_addr;
mb();
for (i = 0; i < count; ++i) {
union ibmveth_buf_desc desc;
skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
if (!skb) {
netdev_dbg(adapter->netdev,
"replenish: unable to allocate skb\n");
adapter->replenish_no_mem++;
break;
}
free_index = pool->consumer_index;
pool->consumer_index++;
if (pool->consumer_index >= pool->size)
pool->consumer_index = 0;
index = pool->free_map[free_index];
BUG_ON(index == IBM_VETH_INVALID_MAP);
BUG_ON(pool->skbuff[index] != NULL);
dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
pool->buff_size, DMA_FROM_DEVICE);
if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
goto failure;
pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
pool->dma_addr[index] = dma_addr;
pool->skbuff[index] = skb;
correlator = ((u64)pool->index << 32) | index;
*(u64 *)skb->data = correlator;
desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
desc.fields.address = dma_addr;
if (rx_flush) {
unsigned int len = min(pool->buff_size,
adapter->netdev->mtu +
IBMVETH_BUFF_OH);
ibmveth_flush_buffer(skb->data, len);
}
lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
desc.desc);
if (lpar_rc != H_SUCCESS) {
goto failure;
} else {
buffers_added++;
adapter->replenish_add_buff_success++;
}
}
mb();
atomic_add(buffers_added, &(pool->available));
return;
failure:
pool->free_map[free_index] = index;
pool->skbuff[index] = NULL;
if (pool->consumer_index == 0)
pool->consumer_index = pool->size - 1;
else
pool->consumer_index--;
if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
dma_unmap_single(&adapter->vdev->dev,
pool->dma_addr[index], pool->buff_size,
DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
adapter->replenish_add_buff_failure++;
mb();
atomic_add(buffers_added, &(pool->available));
}
/* replenish routine */
static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
{
int i;
adapter->replenish_task_cycles++;
for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
if (pool->active &&
(atomic_read(&pool->available) < pool->threshold))
ibmveth_replenish_buffer_pool(adapter, pool);
}
adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
4096 - 8);
}
/* empty and free ana buffer pool - also used to do cleanup in error paths */
static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
struct ibmveth_buff_pool *pool)
{
int i;
kfree(pool->free_map);
pool->free_map = NULL;
if (pool->skbuff && pool->dma_addr) {
for (i = 0; i < pool->size; ++i) {
struct sk_buff *skb = pool->skbuff[i];
if (skb) {
dma_unmap_single(&adapter->vdev->dev,
pool->dma_addr[i],
pool->buff_size,
DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
pool->skbuff[i] = NULL;
}
}
}
if (pool->dma_addr) {
kfree(pool->dma_addr);
pool->dma_addr = NULL;
}
if (pool->skbuff) {
kfree(pool->skbuff);
pool->skbuff = NULL;
}
}
/* remove a buffer from a pool */
static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
u64 correlator)
{
unsigned int pool = correlator >> 32;
unsigned int index = correlator & 0xffffffffUL;
unsigned int free_index;
struct sk_buff *skb;
BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
BUG_ON(index >= adapter->rx_buff_pool[pool].size);
skb = adapter->rx_buff_pool[pool].skbuff[index];
BUG_ON(skb == NULL);
adapter->rx_buff_pool[pool].skbuff[index] = NULL;
dma_unmap_single(&adapter->vdev->dev,
adapter->rx_buff_pool[pool].dma_addr[index],
adapter->rx_buff_pool[pool].buff_size,
DMA_FROM_DEVICE);
free_index = adapter->rx_buff_pool[pool].producer_index;
adapter->rx_buff_pool[pool].producer_index++;
if (adapter->rx_buff_pool[pool].producer_index >=
adapter->rx_buff_pool[pool].size)
adapter->rx_buff_pool[pool].producer_index = 0;
adapter->rx_buff_pool[pool].free_map[free_index] = index;
mb();
atomic_dec(&(adapter->rx_buff_pool[pool].available));
}
/* get the current buffer on the rx queue */
static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
{
u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
unsigned int pool = correlator >> 32;
unsigned int index = correlator & 0xffffffffUL;
BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
BUG_ON(index >= adapter->rx_buff_pool[pool].size);
return adapter->rx_buff_pool[pool].skbuff[index];
}
/* recycle the current buffer on the rx queue */
static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
{
u32 q_index = adapter->rx_queue.index;
u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
unsigned int pool = correlator >> 32;
unsigned int index = correlator & 0xffffffffUL;
union ibmveth_buf_desc desc;
unsigned long lpar_rc;
int ret = 1;
BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
BUG_ON(index >= adapter->rx_buff_pool[pool].size);
if (!adapter->rx_buff_pool[pool].active) {
ibmveth_rxq_harvest_buffer(adapter);
ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
goto out;
}
desc.fields.flags_len = IBMVETH_BUF_VALID |
adapter->rx_buff_pool[pool].buff_size;
desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
if (lpar_rc != H_SUCCESS) {
netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
"during recycle rc=%ld", lpar_rc);
ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
ret = 0;
}
if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
adapter->rx_queue.index = 0;
adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
}
out:
return ret;
}
static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
{
ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
adapter->rx_queue.index = 0;
adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
}
}
static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
{
int i;
struct device *dev = &adapter->vdev->dev;
if (adapter->buffer_list_addr != NULL) {
if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
DMA_BIDIRECTIONAL);
adapter->buffer_list_dma = DMA_ERROR_CODE;
}
free_page((unsigned long)adapter->buffer_list_addr);
adapter->buffer_list_addr = NULL;
}
if (adapter->filter_list_addr != NULL) {
if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
dma_unmap_single(dev, adapter->filter_list_dma, 4096,
DMA_BIDIRECTIONAL);
adapter->filter_list_dma = DMA_ERROR_CODE;
}
free_page((unsigned long)adapter->filter_list_addr);
adapter->filter_list_addr = NULL;
}
if (adapter->rx_queue.queue_addr != NULL) {
if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
dma_unmap_single(dev,
adapter->rx_queue.queue_dma,
adapter->rx_queue.queue_len,
DMA_BIDIRECTIONAL);
adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
}
kfree(adapter->rx_queue.queue_addr);
adapter->rx_queue.queue_addr = NULL;
}
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
if (adapter->rx_buff_pool[i].active)
ibmveth_free_buffer_pool(adapter,
&adapter->rx_buff_pool[i]);
if (adapter->bounce_buffer != NULL) {
if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
dma_unmap_single(&adapter->vdev->dev,
adapter->bounce_buffer_dma,
adapter->netdev->mtu + IBMVETH_BUFF_OH,
DMA_BIDIRECTIONAL);
adapter->bounce_buffer_dma = DMA_ERROR_CODE;
}
kfree(adapter->bounce_buffer);
adapter->bounce_buffer = NULL;
}
}
static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
union ibmveth_buf_desc rxq_desc, u64 mac_address)
{
int rc, try_again = 1;
/*
* After a kexec the adapter will still be open, so our attempt to
* open it will fail. So if we get a failure we free the adapter and
* try again, but only once.
*/
retry:
rc = h_register_logical_lan(adapter->vdev->unit_address,
adapter->buffer_list_dma, rxq_desc.desc,
adapter->filter_list_dma, mac_address);
if (rc != H_SUCCESS && try_again) {
do {
rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
try_again = 0;
goto retry;
}
return rc;
}
static int ibmveth_open(struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
u64 mac_address = 0;
int rxq_entries = 1;
unsigned long lpar_rc;
int rc;
union ibmveth_buf_desc rxq_desc;
int i;
struct device *dev;
netdev_dbg(netdev, "open starting\n");
napi_enable(&adapter->napi);
for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
rxq_entries += adapter->rx_buff_pool[i].size;
adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
netdev_err(netdev, "unable to allocate filter or buffer list "
"pages\n");
rc = -ENOMEM;
goto err_out;
}
adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
rxq_entries;
adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len,
GFP_KERNEL);
if (!adapter->rx_queue.queue_addr) {
netdev_err(netdev, "unable to allocate rx queue pages\n");
rc = -ENOMEM;
goto err_out;
}
dev = &adapter->vdev->dev;
adapter->buffer_list_dma = dma_map_single(dev,
adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
adapter->filter_list_dma = dma_map_single(dev,
adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
adapter->rx_queue.queue_dma = dma_map_single(dev,
adapter->rx_queue.queue_addr,
adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
(dma_mapping_error(dev, adapter->filter_list_dma)) ||
(dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
netdev_err(netdev, "unable to map filter or buffer list "
"pages\n");
rc = -ENOMEM;
goto err_out;
}
adapter->rx_queue.index = 0;
adapter->rx_queue.num_slots = rxq_entries;
adapter->rx_queue.toggle = 1;
memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
mac_address = mac_address >> 16;
rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
adapter->rx_queue.queue_len;
rxq_desc.fields.address = adapter->rx_queue.queue_dma;
netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
lpar_rc);
netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
"desc:0x%llx MAC:0x%llx\n",
adapter->buffer_list_dma,
adapter->filter_list_dma,
rxq_desc.desc,
mac_address);
rc = -ENONET;
goto err_out;
}
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
if (!adapter->rx_buff_pool[i].active)
continue;
if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
netdev_err(netdev, "unable to alloc pool\n");
adapter->rx_buff_pool[i].active = 0;
rc = -ENOMEM;
goto err_out;
}
}
netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
netdev);
if (rc != 0) {
netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
netdev->irq, rc);
do {
rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
goto err_out;
}
adapter->bounce_buffer =
kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
if (!adapter->bounce_buffer) {
netdev_err(netdev, "unable to allocate bounce buffer\n");
rc = -ENOMEM;
goto err_out_free_irq;
}
adapter->bounce_buffer_dma =
dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
netdev_err(netdev, "unable to map bounce buffer\n");
rc = -ENOMEM;
goto err_out_free_irq;
}
netdev_dbg(netdev, "initial replenish cycle\n");
ibmveth_interrupt(netdev->irq, netdev);
netif_start_queue(netdev);
netdev_dbg(netdev, "open complete\n");
return 0;
err_out_free_irq:
free_irq(netdev->irq, netdev);
err_out:
ibmveth_cleanup(adapter);
napi_disable(&adapter->napi);
return rc;
}
static int ibmveth_close(struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
long lpar_rc;
netdev_dbg(netdev, "close starting\n");
napi_disable(&adapter->napi);
if (!adapter->pool_config)
netif_stop_queue(netdev);
h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
do {
lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_free_logical_lan failed with %lx, "
"continuing with close\n", lpar_rc);
}
free_irq(netdev->irq, netdev);
adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
4096 - 8);
ibmveth_cleanup(adapter);
netdev_dbg(netdev, "close complete\n");
return 0;
}
static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
SUPPORTED_FIBRE);
cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
ADVERTISED_FIBRE);
ethtool_cmd_speed_set(cmd, SPEED_1000);
cmd->duplex = DUPLEX_FULL;
cmd->port = PORT_FIBRE;
cmd->phy_address = 0;
cmd->transceiver = XCVR_INTERNAL;
cmd->autoneg = AUTONEG_ENABLE;
cmd->maxtxpkt = 0;
cmd->maxrxpkt = 1;
return 0;
}
static void netdev_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
strncpy(info->version, ibmveth_driver_version,
sizeof(info->version) - 1);
}
static u32 ibmveth_fix_features(struct net_device *dev, u32 features)
{
/*
* Since the ibmveth firmware interface does not have the
* concept of separate tx/rx checksum offload enable, if rx
* checksum is disabled we also have to disable tx checksum
* offload. Once we disable rx checksum offload, we are no
* longer allowed to send tx buffers that are not properly
* checksummed.
*/
if (!(features & NETIF_F_RXCSUM))
features &= ~NETIF_F_ALL_CSUM;
return features;
}
static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
unsigned long set_attr, clr_attr, ret_attr;
unsigned long set_attr6, clr_attr6;
long ret, ret6;
int rc1 = 0, rc2 = 0;
int restart = 0;
if (netif_running(dev)) {
restart = 1;
adapter->pool_config = 1;
ibmveth_close(dev);
adapter->pool_config = 0;
}
set_attr = 0;
clr_attr = 0;
if (data) {
set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
} else {
clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
}
ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
!(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
(ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
set_attr, &ret_attr);
if (ret != H_SUCCESS) {
netdev_err(dev, "unable to change IPv4 checksum "
"offload settings. %d rc=%ld\n",
data, ret);
ret = h_illan_attributes(adapter->vdev->unit_address,
set_attr, clr_attr, &ret_attr);
} else {
adapter->fw_ipv4_csum_support = data;
}
ret6 = h_illan_attributes(adapter->vdev->unit_address,
clr_attr6, set_attr6, &ret_attr);
if (ret6 != H_SUCCESS) {
netdev_err(dev, "unable to change IPv6 checksum "
"offload settings. %d rc=%ld\n",
data, ret);
ret = h_illan_attributes(adapter->vdev->unit_address,
set_attr6, clr_attr6,
&ret_attr);
} else
adapter->fw_ipv6_csum_support = data;
if (ret != H_SUCCESS || ret6 != H_SUCCESS)
adapter->rx_csum = data;
else
rc1 = -EIO;
} else {
rc1 = -EIO;
netdev_err(dev, "unable to change checksum offload settings."
" %d rc=%ld ret_attr=%lx\n", data, ret,
ret_attr);
}
if (restart)
rc2 = ibmveth_open(dev);
return rc1 ? rc1 : rc2;
}
static int ibmveth_set_features(struct net_device *dev, u32 features)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
int rx_csum = !!(features & NETIF_F_RXCSUM);
int rc;
if (rx_csum == adapter->rx_csum)
return 0;
rc = ibmveth_set_csum_offload(dev, rx_csum);
if (rc && !adapter->rx_csum)
dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
return rc;
}
static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
int i;
if (stringset != ETH_SS_STATS)
return;
for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
}
static int ibmveth_get_sset_count(struct net_device *dev, int sset)
{
switch (sset) {
case ETH_SS_STATS:
return ARRAY_SIZE(ibmveth_stats);
default:
return -EOPNOTSUPP;
}
}
static void ibmveth_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
int i;
struct ibmveth_adapter *adapter = netdev_priv(dev);
for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
}
static const struct ethtool_ops netdev_ethtool_ops = {
.get_drvinfo = netdev_get_drvinfo,
.get_settings = netdev_get_settings,
.get_link = ethtool_op_get_link,
.get_strings = ibmveth_get_strings,
.get_sset_count = ibmveth_get_sset_count,
.get_ethtool_stats = ibmveth_get_ethtool_stats,
};
static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
return -EOPNOTSUPP;
}
#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
static int ibmveth_send(struct ibmveth_adapter *adapter,
union ibmveth_buf_desc *descs)
{
unsigned long correlator;
unsigned int retry_count;
unsigned long ret;
/*
* The retry count sets a maximum for the number of broadcast and
* multicast destinations within the system.
*/
retry_count = 1024;
correlator = 0;
do {
ret = h_send_logical_lan(adapter->vdev->unit_address,
descs[0].desc, descs[1].desc,
descs[2].desc, descs[3].desc,
descs[4].desc, descs[5].desc,
correlator, &correlator);
} while ((ret == H_BUSY) && (retry_count--));
if (ret != H_SUCCESS && ret != H_DROPPED) {
netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
"with rc=%ld\n", ret);
return 1;
}
return 0;
}
static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
unsigned int desc_flags;
union ibmveth_buf_desc descs[6];
int last, i;
int force_bounce = 0;
/*
* veth handles a maximum of 6 segments including the header, so
* we have to linearize the skb if there are more than this.
*/
if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
netdev->stats.tx_dropped++;
goto out;
}
/* veth can't checksum offload UDP */
if (skb->ip_summed == CHECKSUM_PARTIAL &&
((skb->protocol == htons(ETH_P_IP) &&
ip_hdr(skb)->protocol != IPPROTO_TCP) ||
(skb->protocol == htons(ETH_P_IPV6) &&
ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
skb_checksum_help(skb)) {
netdev_err(netdev, "tx: failed to checksum packet\n");
netdev->stats.tx_dropped++;
goto out;
}
desc_flags = IBMVETH_BUF_VALID;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
unsigned char *buf = skb_transport_header(skb) +
skb->csum_offset;
desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
/* Need to zero out the checksum */
buf[0] = 0;
buf[1] = 0;
}
retry_bounce:
memset(descs, 0, sizeof(descs));
/*
* If a linear packet is below the rx threshold then
* copy it into the static bounce buffer. This avoids the
* cost of a TCE insert and remove.
*/
if (force_bounce || (!skb_is_nonlinear(skb) &&
(skb->len < tx_copybreak))) {
skb_copy_from_linear_data(skb, adapter->bounce_buffer,
skb->len);
descs[0].fields.flags_len = desc_flags | skb->len;
descs[0].fields.address = adapter->bounce_buffer_dma;
if (ibmveth_send(adapter, descs)) {
adapter->tx_send_failed++;
netdev->stats.tx_dropped++;
} else {
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
}
goto out;
}
/* Map the header */
descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
skb_headlen(skb),
DMA_TO_DEVICE);
if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))