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kernel/drivers/net/ethernet/ibm/ibmveth.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IBM Power Virtual Ethernet Device Driver
*
* 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/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 <net/tcp.h>
#include <net/ip6_checksum.h>
#include "ibmveth.h"
static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter,
bool reuse);
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 "1.06"
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");
static bool old_large_send __read_mostly;
module_param(old_large_send, bool, 0444);
MODULE_PARM_DESC(old_large_send,
"Use old large send method on firmware that supports the new method");
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))
static 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) },
{ "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
{ "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
{ "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
};
/* simple methods of getting data from the current rxq entry */
static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
{
return be32_to_cpu(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_large_packet(struct ibmveth_adapter *adapter)
{
return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
}
static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
{
return be32_to_cpu(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;
}
static unsigned int ibmveth_real_max_tx_queues(void)
{
unsigned int n_cpu = num_online_cpus();
return min(n_cpu, IBMVETH_MAX_QUEUES);
}
/* 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_array(pool->size, sizeof(u16), GFP_KERNEL);
if (!pool->free_map)
return -1;
pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), 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;
}
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("dcbf %0,%1,1" :: "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;
free_index = pool->consumer_index;
index = pool->free_map[free_index];
skb = NULL;
BUG_ON(index == IBM_VETH_INVALID_MAP);
/* are we allocating a new buffer or recycling an old one */
if (pool->skbuff[index])
goto reuse;
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;
}
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->dma_addr[index] = dma_addr;
pool->skbuff[index] = skb;
if (rx_flush) {
unsigned int len = min(pool->buff_size,
adapter->netdev->mtu +
IBMVETH_BUFF_OH);
ibmveth_flush_buffer(skb->data, len);
}
reuse:
dma_addr = pool->dma_addr[index];
desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
desc.fields.address = dma_addr;
correlator = ((u64)pool->index << 32) | index;
*(u64 *)pool->skbuff[index]->data = correlator;
lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
desc.desc);
if (lpar_rc != H_SUCCESS) {
netdev_warn(adapter->netdev,
"%sadd_logical_lan failed %lu\n",
skb ? "" : "When recycling: ", lpar_rc);
goto failure;
}
pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
pool->consumer_index++;
if (pool->consumer_index >= pool->size)
pool->consumer_index = 0;
buffers_added++;
adapter->replenish_add_buff_success++;
}
mb();
atomic_add(buffers_added, &(pool->available));
return;
failure:
if (dma_addr && !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(pool->skbuff[index]);
pool->skbuff[index] = NULL;
adapter->replenish_add_buff_failure++;
mb();
atomic_add(buffers_added, &(pool->available));
}
/*
* The final 8 bytes of the buffer list is a counter of frames dropped
* because there was not a buffer in the buffer list capable of holding
* the frame.
*/
static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
{
__be64 *p = adapter->buffer_list_addr + 4096 - 8;
adapter->rx_no_buffer = be64_to_cpup(p);
}
/* 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);
}
ibmveth_update_rx_no_buffer(adapter);
}
/* 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, bool reuse)
{
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);
/* if we are going to reuse the buffer then keep the pointers around
* but mark index as available. replenish will see the skb pointer and
* assume it is to be recycled.
*/
if (!reuse) {
/* remove the skb pointer to mark free. actual freeing is done
* by upper level networking after gro_recieve
*/
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];
}
static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter,
bool reuse)
{
u64 cor;
cor = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
ibmveth_remove_buffer_from_pool(adapter, cor, reuse);
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_free_tx_ltb(struct ibmveth_adapter *adapter, int idx)
{
dma_unmap_single(&adapter->vdev->dev, adapter->tx_ltb_dma[idx],
adapter->tx_ltb_size, DMA_TO_DEVICE);
kfree(adapter->tx_ltb_ptr[idx]);
adapter->tx_ltb_ptr[idx] = NULL;
}
static int ibmveth_allocate_tx_ltb(struct ibmveth_adapter *adapter, int idx)
{
adapter->tx_ltb_ptr[idx] = kzalloc(adapter->tx_ltb_size,
GFP_KERNEL);
if (!adapter->tx_ltb_ptr[idx]) {
netdev_err(adapter->netdev,
"unable to allocate tx long term buffer\n");
return -ENOMEM;
}
adapter->tx_ltb_dma[idx] = dma_map_single(&adapter->vdev->dev,
adapter->tx_ltb_ptr[idx],
adapter->tx_ltb_size,
DMA_TO_DEVICE);
if (dma_mapping_error(&adapter->vdev->dev, adapter->tx_ltb_dma[idx])) {
netdev_err(adapter->netdev,
"unable to DMA map tx long term buffer\n");
kfree(adapter->tx_ltb_ptr[idx]);
adapter->tx_ltb_ptr[idx] = NULL;
return -ENOMEM;
}
return 0;
}
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;
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;
rc = -ENOMEM;
adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
if (!adapter->buffer_list_addr) {
netdev_err(netdev, "unable to allocate list pages\n");
goto out;
}
adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
if (!adapter->filter_list_addr) {
netdev_err(netdev, "unable to allocate filter pages\n");
goto out_free_buffer_list;
}
dev = &adapter->vdev->dev;
adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
rxq_entries;
adapter->rx_queue.queue_addr =
dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
&adapter->rx_queue.queue_dma, GFP_KERNEL);
if (!adapter->rx_queue.queue_addr)
goto out_free_filter_list;
adapter->buffer_list_dma = dma_map_single(dev,
adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
netdev_err(netdev, "unable to map buffer list pages\n");
goto out_free_queue_mem;
}
adapter->filter_list_dma = dma_map_single(dev,
adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, adapter->filter_list_dma)) {
netdev_err(netdev, "unable to map filter list pages\n");
goto out_unmap_buffer_list;
}
for (i = 0; i < netdev->real_num_tx_queues; i++) {
if (ibmveth_allocate_tx_ltb(adapter, i))
goto out_free_tx_ltb;
}
adapter->rx_queue.index = 0;
adapter->rx_queue.num_slots = rxq_entries;
adapter->rx_queue.toggle = 1;
mac_address = ether_addr_to_u64(netdev->dev_addr);
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 out_unmap_filter_list;
}
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 out_free_buffer_pools;
}
}
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 {
lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
goto out_free_buffer_pools;
}
rc = -ENOMEM;
netdev_dbg(netdev, "initial replenish cycle\n");
ibmveth_interrupt(netdev->irq, netdev);
netif_tx_start_all_queues(netdev);
netdev_dbg(netdev, "open complete\n");
return 0;
out_free_buffer_pools:
while (--i >= 0) {
if (adapter->rx_buff_pool[i].active)
ibmveth_free_buffer_pool(adapter,
&adapter->rx_buff_pool[i]);
}
out_unmap_filter_list:
dma_unmap_single(dev, adapter->filter_list_dma, 4096,
DMA_BIDIRECTIONAL);
out_free_tx_ltb:
while (--i >= 0) {
ibmveth_free_tx_ltb(adapter, i);
}
out_unmap_buffer_list:
dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
DMA_BIDIRECTIONAL);
out_free_queue_mem:
dma_free_coherent(dev, adapter->rx_queue.queue_len,
adapter->rx_queue.queue_addr,
adapter->rx_queue.queue_dma);
out_free_filter_list:
free_page((unsigned long)adapter->filter_list_addr);
out_free_buffer_list:
free_page((unsigned long)adapter->buffer_list_addr);
out:
napi_disable(&adapter->napi);
return rc;
}
static int ibmveth_close(struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
struct device *dev = &adapter->vdev->dev;
long lpar_rc;
int i;
netdev_dbg(netdev, "close starting\n");
napi_disable(&adapter->napi);
netif_tx_stop_all_queues(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);
ibmveth_update_rx_no_buffer(adapter);
dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
DMA_BIDIRECTIONAL);
free_page((unsigned long)adapter->buffer_list_addr);
dma_unmap_single(dev, adapter->filter_list_dma, 4096,
DMA_BIDIRECTIONAL);
free_page((unsigned long)adapter->filter_list_addr);
dma_free_coherent(dev, adapter->rx_queue.queue_len,
adapter->rx_queue.queue_addr,
adapter->rx_queue.queue_dma);
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]);
for (i = 0; i < netdev->real_num_tx_queues; i++)
ibmveth_free_tx_ltb(adapter, i);
netdev_dbg(netdev, "close complete\n");
return 0;
}
static int ibmveth_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
return ethtool_virtdev_set_link_ksettings(dev, cmd,
&adapter->speed,
&adapter->duplex);
}
static int ibmveth_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
cmd->base.speed = adapter->speed;
cmd->base.duplex = adapter->duplex;
cmd->base.port = PORT_OTHER;
return 0;
}
static void ibmveth_init_link_settings(struct net_device *dev)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
adapter->speed = SPEED_1000;
adapter->duplex = DUPLEX_FULL;
}
static void netdev_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strscpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
strscpy(info->version, ibmveth_driver_version, sizeof(info->version));
}
static netdev_features_t ibmveth_fix_features(struct net_device *dev,
netdev_features_t 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_CSUM_MASK;
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, ret4, ret6;
int rc1 = 0, rc2 = 0;
int restart = 0;
if (netif_running(dev)) {
restart = 1;
ibmveth_close(dev);
}
set_attr = 0;
clr_attr = 0;
set_attr6 = 0;
clr_attr6 = 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_PADDED_PKT_CSUM)) {
ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
set_attr, &ret_attr);
if (ret4 != H_SUCCESS) {
netdev_err(dev, "unable to change IPv4 checksum "
"offload settings. %d rc=%ld\n",
data, ret4);
h_illan_attributes(adapter->vdev->unit_address,
set_attr, clr_attr, &ret_attr);
if (data == 1)
dev->features &= ~NETIF_F_IP_CSUM;
} 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, ret6);
h_illan_attributes(adapter->vdev->unit_address,
set_attr6, clr_attr6, &ret_attr);
if (data == 1)
dev->features &= ~NETIF_F_IPV6_CSUM;
} else
adapter->fw_ipv6_csum_support = data;
if (ret4 == 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_tso(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
unsigned long set_attr, clr_attr, ret_attr;
long ret1, ret2;
int rc1 = 0, rc2 = 0;
int restart = 0;
if (netif_running(dev)) {
restart = 1;
ibmveth_close(dev);
}
set_attr = 0;
clr_attr = 0;
if (data)
set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
else
clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
!old_large_send) {
ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
set_attr, &ret_attr);
if (ret2 != H_SUCCESS) {
netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
data, ret2);
h_illan_attributes(adapter->vdev->unit_address,
set_attr, clr_attr, &ret_attr);
if (data == 1)
dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
rc1 = -EIO;
} else {
adapter->fw_large_send_support = data;
adapter->large_send = data;
}
} else {
/* Older firmware version of large send offload does not
* support tcp6/ipv6
*/
if (data == 1) {
dev->features &= ~NETIF_F_TSO6;
netdev_info(dev, "TSO feature requires all partitions to have updated driver");
}
adapter->large_send = data;
}
if (restart)
rc2 = ibmveth_open(dev);
return rc1 ? rc1 : rc2;
}
static int ibmveth_set_features(struct net_device *dev,
netdev_features_t features)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
int rx_csum = !!(features & NETIF_F_RXCSUM);
int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
int rc1 = 0, rc2 = 0;
if (rx_csum != adapter->rx_csum) {
rc1 = ibmveth_set_csum_offload(dev, rx_csum);
if (rc1 && !adapter->rx_csum)
dev->features =
features & ~(NETIF_F_CSUM_MASK |
NETIF_F_RXCSUM);
}
if (large_send != adapter->large_send) {
rc2 = ibmveth_set_tso(dev, large_send);
if (rc2 && !adapter->large_send)
dev->features =
features & ~(NETIF_F_TSO | NETIF_F_TSO6);
}
return rc1 ? rc1 : rc2;
}
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 void ibmveth_get_channels(struct net_device *netdev,
struct ethtool_channels *channels)
{
channels->max_tx = ibmveth_real_max_tx_queues();
channels->tx_count = netdev->real_num_tx_queues;
channels->max_rx = netdev->real_num_rx_queues;
channels->rx_count = netdev->real_num_rx_queues;
}
static int ibmveth_set_channels(struct net_device *netdev,
struct ethtool_channels *channels)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
unsigned int old = netdev->real_num_tx_queues,
goal = channels->tx_count;
int rc, i;
/* If ndo_open has not been called yet then don't allocate, just set
* desired netdev_queue's and return
*/
if (!(netdev->flags & IFF_UP))
return netif_set_real_num_tx_queues(netdev, goal);
/* We have IBMVETH_MAX_QUEUES netdev_queue's allocated
* but we may need to alloc/free the ltb's.
*/
netif_tx_stop_all_queues(netdev);
/* Allocate any queue that we need */
for (i = old; i < goal; i++) {
if (adapter->tx_ltb_ptr[i])
continue;
rc = ibmveth_allocate_tx_ltb(adapter, i);
if (!rc)
continue;
/* if something goes wrong, free everything we just allocated */
netdev_err(netdev, "Failed to allocate more tx queues, returning to %d queues\n",
old);
goal = old;
old = i;
break;
}
rc = netif_set_real_num_tx_queues(netdev, goal);
if (rc) {
netdev_err(netdev, "Failed to set real tx queues, returning to %d queues\n",
old);
goal = old;
old = i;
}
/* Free any that are no longer needed */
for (i = old; i > goal; i--) {
if (adapter->tx_ltb_ptr[i - 1])
ibmveth_free_tx_ltb(adapter, i - 1);
}
netif_tx_wake_all_queues(netdev);
return rc;
}
static const struct ethtool_ops netdev_ethtool_ops = {
.get_drvinfo = netdev_get_drvinfo,
.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,
.get_link_ksettings = ibmveth_get_link_ksettings,
.set_link_ksettings = ibmveth_set_link_ksettings,
.get_channels = ibmveth_get_channels,
.set_channels = ibmveth_set_channels
};
static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
return -EOPNOTSUPP;
}
static int ibmveth_send(struct ibmveth_adapter *adapter,
unsigned long desc, unsigned long mss)
{
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, desc,
correlator, &correlator, mss,
adapter->fw_large_send_support);
} 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 int ibmveth_is_packet_unsupported(struct sk_buff *skb,
struct net_device *netdev)
{
struct ethhdr *ether_header;
int ret = 0;
ether_header = eth_hdr(skb);
if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) {
netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n");
netdev->stats.tx_dropped++;
ret = -EOPNOTSUPP;
}
return ret;
}
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, total_bytes;
union ibmveth_buf_desc desc;
int i, queue_num = skb_get_queue_mapping(skb);
unsigned long mss = 0;
if (ibmveth_is_packet_unsupported(skb, netdev))
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;
if (skb_is_gso(skb) && adapter->fw_large_send_support)
desc_flags |= IBMVETH_BUF_LRG_SND;
}
if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
if (adapter->fw_large_send_support) {
mss = (unsigned long)skb_shinfo(skb)->gso_size;
adapter->tx_large_packets++;
} else if (!skb_is_gso_v6(skb)) {
/* Put -1 in the IP checksum to tell phyp it
* is a largesend packet. Put the mss in
* the TCP checksum.
*/
ip_hdr(skb)->check = 0xffff;
tcp_hdr(skb)->check =
cpu_to_be16(skb_shinfo(skb)->gso_size);
adapter->tx_large_packets++;
}
}
/* Copy header into mapped buffer */
if (unlikely(skb->len > adapter->tx_ltb_size)) {
netdev_err(adapter->netdev, "tx: packet size (%u) exceeds ltb (%u)\n",
skb->len, adapter->tx_ltb_size);
netdev->stats.tx_dropped++;
goto out;
}
memcpy(adapter->tx_ltb_ptr[queue_num], skb->data, skb_headlen(skb));
total_bytes = skb_headlen(skb);
/* Copy frags into mapped buffers */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
memcpy(adapter->tx_ltb_ptr[queue_num] + total_bytes,
skb_frag_address_safe(frag), skb_frag_size(frag));
total_bytes += skb_frag_size(frag);
}
if (unlikely(total_bytes != skb->len)) {
netdev_err(adapter->netdev, "tx: incorrect packet len copied into ltb (%u != %u)\n",
skb->len, total_bytes);
netdev->stats.tx_dropped++;
goto out;
}
desc.fields.flags_len = desc_flags | skb->len;
desc.fields.address = adapter->tx_ltb_dma[queue_num];
/* finish writing to long_term_buff before VIOS accessing it */
dma_wmb();
if (ibmveth_send(adapter, desc.desc, mss)) {
adapter->tx_send_failed++;
netdev->stats.tx_dropped++;
} else {
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
}
out:
dev_consume_skb_any(skb);
return NETDEV_TX_OK;
}
static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
{
struct tcphdr *tcph;
int offset = 0;
int hdr_len;
/* only TCP packets will be aggregated */
if (skb->protocol == htons(ETH_P_IP)) {
struct iphdr *iph = (struct iphdr *)skb->data;
if (iph->protocol == IPPROTO_TCP) {
offset = iph->ihl * 4;
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
} else {
return;
}
} else if (skb->protocol == htons(ETH_P_IPV6)) {
struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
if (iph6->nexthdr == IPPROTO_TCP) {
offset = sizeof(struct ipv6hdr);
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
} else {
return;
}
} else {
return;
}
/* if mss is not set through Large Packet bit/mss in rx buffer,
* expect that the mss will be written to the tcp header checksum.
*/
tcph = (struct tcphdr *)(skb->data + offset);
if (lrg_pkt) {
skb_shinfo(skb)->gso_size = mss;
} else if (offset) {
skb_shinfo(skb)->gso_size = ntohs(tcph->check);
tcph->check = 0;
}
if (skb_shinfo(skb)->gso_size) {
hdr_len = offset + tcph->doff * 4;
skb_shinfo(skb)->gso_segs =
DIV_ROUND_UP(skb->len - hdr_len,
skb_shinfo(skb)->gso_size);
}
}
static void ibmveth_rx_csum_helper(struct sk_buff *skb,
struct ibmveth_adapter *adapter)
{
struct iphdr *iph = NULL;
struct ipv6hdr *iph6 = NULL;
__be16 skb_proto = 0;
u16 iphlen = 0;
u16 iph_proto = 0;
u16 tcphdrlen = 0;
skb_proto = be16_to_cpu(skb->protocol);
if (skb_proto == ETH_P_IP) {
iph = (struct iphdr *)skb->data;
/* If the IP checksum is not offloaded and if the packet
* is large send, the checksum must be rebuilt.
*/
if (iph->check == 0xffff) {
iph->check = 0;
iph->check = ip_fast_csum((unsigned char *)iph,
iph->ihl);
}
iphlen = iph->ihl * 4;
iph_proto = iph->protocol;
} else if (skb_proto == ETH_P_IPV6) {
iph6 = (struct ipv6hdr *)skb->data;
iphlen = sizeof(struct ipv6hdr);
iph_proto = iph6->nexthdr;
}
/* When CSO is enabled the TCP checksum may have be set to NULL by
* the sender given that we zeroed out TCP checksum field in
* transmit path (refer ibmveth_start_xmit routine). In this case set
* up CHECKSUM_PARTIAL. If the packet is forwarded, the checksum will
* then be recalculated by the destination NIC (CSO must be enabled
* on the destination NIC).
*
* In an OVS environment, when a flow is not cached, specifically for a
* new TCP connection, the first packet information is passed up to
* the user space for finding a flow. During this process, OVS computes
* checksum on the first packet when CHECKSUM_PARTIAL flag is set.
*
* So, re-compute TCP pseudo header checksum.
*/
if (iph_proto == IPPROTO_TCP) {
struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
if (tcph->check == 0x0000) {
/* Recompute TCP pseudo header checksum */
tcphdrlen = skb->len - iphlen;
if (skb_proto == ETH_P_IP)
tcph->check =
~csum_tcpudp_magic(iph->saddr,
iph->daddr, tcphdrlen, iph_proto, 0);
else if (skb_proto == ETH_P_IPV6)
tcph->check =
~csum_ipv6_magic(&iph6->saddr,
&iph6->daddr, tcphdrlen, iph_proto, 0);
/* Setup SKB fields for checksum offload */
skb_partial_csum_set(skb, iphlen,
offsetof(struct tcphdr, check));
skb_reset_network_header(skb);
}
}
}
static int ibmveth_poll(struct napi_struct *napi, int budget)
{
struct ibmveth_adapter *adapter =
container_of(napi, struct ibmveth_adapter, napi);
struct net_device *netdev = adapter->netdev;
int frames_processed = 0;
unsigned long lpar_rc;
u16 mss = 0;
restart_poll:
while (frames_processed < budget) {
if (!ibmveth_rxq_pending_buffer(adapter))
break;
smp_rmb();
if (!ibmveth_rxq_buffer_valid(adapter)) {
wmb(); /* suggested by larson1 */
adapter->rx_invalid_buffer++;
netdev_dbg(netdev, "recycling invalid buffer\n");
ibmveth_rxq_harvest_buffer(adapter, true);
} else {
struct sk_buff *skb, *new_skb;
int length = ibmveth_rxq_frame_length(adapter);
int offset = ibmveth_rxq_frame_offset(adapter);
int csum_good = ibmveth_rxq_csum_good(adapter);
int lrg_pkt = ibmveth_rxq_large_packet(adapter);
__sum16 iph_check = 0;
skb = ibmveth_rxq_get_buffer(adapter);
/* if the large packet bit is set in the rx queue
* descriptor, the mss will be written by PHYP eight
* bytes from the start of the rx buffer, which is
* skb->data at this stage
*/
if (lrg_pkt) {
__be64 *rxmss = (__be64 *)(skb->data + 8);
mss = (u16)be64_to_cpu(*rxmss);
}
new_skb = NULL;
if (length < rx_copybreak)
new_skb = netdev_alloc_skb(netdev, length);
if (new_skb) {
skb_copy_to_linear_data(new_skb,
skb->data + offset,
length);
if (rx_flush)
ibmveth_flush_buffer(skb->data,
length + offset);
ibmveth_rxq_harvest_buffer(adapter, true);
skb = new_skb;
} else {
ibmveth_rxq_harvest_buffer(adapter, false);
skb_reserve(skb, offset);
}
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, netdev);
/* PHYP without PLSO support places a -1 in the ip
* checksum for large send frames.
*/
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
struct iphdr *iph = (struct iphdr *)skb->data;
iph_check = iph->check;
}
if ((length > netdev->mtu + ETH_HLEN) ||
lrg_pkt || iph_check == 0xffff) {
ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
adapter->rx_large_packets++;
}
if (csum_good) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
ibmveth_rx_csum_helper(skb, adapter);
}
napi_gro_receive(napi, skb); /* send it up */
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += length;
frames_processed++;
}
}
ibmveth_replenish_task(adapter);
if (frames_processed == budget)
goto out;
if (!napi_complete_done(napi, frames_processed))
goto out;
/* We think we are done - reenable interrupts,
* then check once more to make sure we are done.
*/
lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_ENABLE);
BUG_ON(lpar_rc != H_SUCCESS);
if (ibmveth_rxq_pending_buffer(adapter) && napi_schedule(napi)) {
lpar_rc = h_vio_signal(adapter->vdev->unit_address,
VIO_IRQ_DISABLE);
goto restart_poll;
}
out:
return frames_processed;
}
static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
{
struct net_device *netdev = dev_instance;
struct ibmveth_adapter *adapter = netdev_priv(netdev);
unsigned long lpar_rc;
if (napi_schedule_prep(&adapter->napi)) {
lpar_rc = h_vio_signal(adapter->vdev->unit_address,
VIO_IRQ_DISABLE);
BUG_ON(lpar_rc != H_SUCCESS);
__napi_schedule(&adapter->napi);
}
return IRQ_HANDLED;
}
static void ibmveth_set_multicast_list(struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev_priv(netdev);
unsigned long lpar_rc;
if ((netdev->flags & IFF_PROMISC) ||
(netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
IbmVethMcastEnableRecv |
IbmVethMcastDisableFiltering,
0);
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
"entering promisc mode\n", lpar_rc);
}
} else {
struct netdev_hw_addr *ha;
/* clear the filter table & disable filtering */
lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
IbmVethMcastEnableRecv |
IbmVethMcastDisableFiltering |
IbmVethMcastClearFilterTable,
0);
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
"attempting to clear filter table\n",
lpar_rc);
}
/* add the addresses to the filter table */
netdev_for_each_mc_addr(ha, netdev) {
/* add the multicast address to the filter table */
u64 mcast_addr;
mcast_addr = ether_addr_to_u64(ha->addr);
lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
IbmVethMcastAddFilter,
mcast_addr);
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_multicast_ctrl rc=%ld "
"when adding an entry to the filter "
"table\n", lpar_rc);
}
}
/* re-enable filtering */
lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
IbmVethMcastEnableFiltering,
0);
if (lpar_rc != H_SUCCESS) {
netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
"enabling filtering\n", lpar_rc);
}
}
}
static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
struct vio_dev *viodev = adapter->vdev;
int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
int i, rc;
int need_restart = 0;
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
break;
if (i == IBMVETH_NUM_BUFF_POOLS)
return -EINVAL;
/* Deactivate all the buffer pools so that the next loop can activate
only the buffer pools necessary to hold the new MTU */
if (netif_running(adapter->netdev)) {
need_restart = 1;
ibmveth_close(adapter->netdev);
}
/* Look for an active buffer pool that can hold the new MTU */
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
adapter->rx_buff_pool[i].active = 1;
if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
WRITE_ONCE(dev->mtu, new_mtu);
vio_cmo_set_dev_desired(viodev,
ibmveth_get_desired_dma
(viodev));
if (need_restart) {
return ibmveth_open(adapter->netdev);
}
return 0;
}
}
if (need_restart && (rc = ibmveth_open(adapter->netdev)))
return rc;
return -EINVAL;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void ibmveth_poll_controller(struct net_device *dev)
{
ibmveth_replenish_task(netdev_priv(dev));
ibmveth_interrupt(dev->irq, dev);
}
#endif
/**
* ibmveth_get_desired_dma - Calculate IO memory desired by the driver
*
* @vdev: struct vio_dev for the device whose desired IO mem is to be returned
*
* Return value:
* Number of bytes of IO data the driver will need to perform well.
*/
static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
{
struct net_device *netdev = dev_get_drvdata(&vdev->dev);
struct ibmveth_adapter *adapter;
struct iommu_table *tbl;
unsigned long ret;
int i;
int rxqentries = 1;
tbl = get_iommu_table_base(&vdev->dev);
/* netdev inits at probe time along with the structures we need below*/
if (netdev == NULL)
return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
adapter = netdev_priv(netdev);
ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
/* add size of mapped tx buffers */
ret += IOMMU_PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE, tbl);
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
/* add the size of the active receive buffers */
if (adapter->rx_buff_pool[i].active)
ret +=
adapter->rx_buff_pool[i].size *
IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
buff_size, tbl);
rxqentries += adapter->rx_buff_pool[i].size;
}
/* add the size of the receive queue entries */
ret += IOMMU_PAGE_ALIGN(
rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
return ret;
}
static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
{
struct ibmveth_adapter *adapter = netdev_priv(dev);
struct sockaddr *addr = p;
u64 mac_address;
int rc;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
mac_address = ether_addr_to_u64(addr->sa_data);
rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
if (rc) {
netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
return rc;
}
eth_hw_addr_set(dev, addr->sa_data);
return 0;
}
static const struct net_device_ops ibmveth_netdev_ops = {
.ndo_open = ibmveth_open,
.ndo_stop = ibmveth_close,
.ndo_start_xmit = ibmveth_start_xmit,
.ndo_set_rx_mode = ibmveth_set_multicast_list,
.ndo_eth_ioctl = ibmveth_ioctl,
.ndo_change_mtu = ibmveth_change_mtu,
.ndo_fix_features = ibmveth_fix_features,
.ndo_set_features = ibmveth_set_features,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = ibmveth_set_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = ibmveth_poll_controller,
#endif
};
static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
{
int rc, i, mac_len;
struct net_device *netdev;
struct ibmveth_adapter *adapter;
unsigned char *mac_addr_p;
__be32 *mcastFilterSize_p;
long ret;
unsigned long ret_attr;
dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
dev->unit_address);
mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
&mac_len);
if (!mac_addr_p) {
dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
return -EINVAL;
}
/* Workaround for old/broken pHyp */
if (mac_len == 8)
mac_addr_p += 2;
else if (mac_len != 6) {
dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
mac_len);
return -EINVAL;
}
mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
VETH_MCAST_FILTER_SIZE,
NULL);
if (!mcastFilterSize_p) {
dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
"attribute\n");
return -EINVAL;
}
netdev = alloc_etherdev_mqs(sizeof(struct ibmveth_adapter), IBMVETH_MAX_QUEUES, 1);
if (!netdev)
return -ENOMEM;
adapter = netdev_priv(netdev);
dev_set_drvdata(&dev->dev, netdev);
adapter->vdev = dev;
adapter->netdev = netdev;
adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
ibmveth_init_link_settings(netdev);
netif_napi_add_weight(netdev, &adapter->napi, ibmveth_poll, 16);
netdev->irq = dev->irq;
netdev->netdev_ops = &ibmveth_netdev_ops;
netdev->ethtool_ops = &netdev_ethtool_ops;
SET_NETDEV_DEV(netdev, &dev->dev);
netdev->hw_features = NETIF_F_SG;
if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_RXCSUM;
}
netdev->features |= netdev->hw_features;
ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
/* If running older firmware, TSO should not be enabled by default */
if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
!old_large_send) {
netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
netdev->features |= netdev->hw_features;
} else {
netdev->hw_features |= NETIF_F_TSO;
}
adapter->is_active_trunk = false;
if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
adapter->is_active_trunk = true;
netdev->hw_features |= NETIF_F_FRAGLIST;
netdev->features |= NETIF_F_FRAGLIST;
}
netdev->min_mtu = IBMVETH_MIN_MTU;
netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
eth_hw_addr_set(netdev, mac_addr_p);
if (firmware_has_feature(FW_FEATURE_CMO))
memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
int error;
ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
pool_count[i], pool_size[i],
pool_active[i]);
error = kobject_init_and_add(kobj, &ktype_veth_pool,
&dev->dev.kobj, "pool%d", i);
if (!error)
kobject_uevent(kobj, KOBJ_ADD);
}
rc = netif_set_real_num_tx_queues(netdev, min(num_online_cpus(),
IBMVETH_DEFAULT_QUEUES));
if (rc) {
netdev_dbg(netdev, "failed to set number of tx queues rc=%d\n",
rc);
free_netdev(netdev);
return rc;
}
adapter->tx_ltb_size = PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE);
for (i = 0; i < IBMVETH_MAX_QUEUES; i++)
adapter->tx_ltb_ptr[i] = NULL;
netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
netdev_dbg(netdev, "registering netdev...\n");
ibmveth_set_features(netdev, netdev->features);
rc = register_netdev(netdev);
if (rc) {
netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
free_netdev(netdev);
return rc;
}
netdev_dbg(netdev, "registered\n");
return 0;
}
static void ibmveth_remove(struct vio_dev *dev)
{
struct net_device *netdev = dev_get_drvdata(&dev->dev);
struct ibmveth_adapter *adapter = netdev_priv(netdev);
int i;
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
kobject_put(&adapter->rx_buff_pool[i].kobj);
unregister_netdev(netdev);
free_netdev(netdev);
dev_set_drvdata(&dev->dev, NULL);
}
static struct attribute veth_active_attr;
static struct attribute veth_num_attr;
static struct attribute veth_size_attr;
static ssize_t veth_pool_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct ibmveth_buff_pool *pool = container_of(kobj,
struct ibmveth_buff_pool,
kobj);
if (attr == &veth_active_attr)
return sprintf(buf, "%d\n", pool->active);
else if (attr == &veth_num_attr)
return sprintf(buf, "%d\n", pool->size);
else if (attr == &veth_size_attr)
return sprintf(buf, "%d\n", pool->buff_size);
return 0;
}
static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
struct ibmveth_buff_pool *pool = container_of(kobj,
struct ibmveth_buff_pool,
kobj);
struct net_device *netdev = dev_get_drvdata(kobj_to_dev(kobj->parent));
struct ibmveth_adapter *adapter = netdev_priv(netdev);
long value = simple_strtol(buf, NULL, 10);
long rc;
if (attr == &veth_active_attr) {
if (value && !pool->active) {
if (netif_running(netdev)) {
if (ibmveth_alloc_buffer_pool(pool)) {
netdev_err(netdev,
"unable to alloc pool\n");
return -ENOMEM;
}
pool->active = 1;
ibmveth_close(netdev);
if ((rc = ibmveth_open(netdev)))
return rc;
} else {
pool->active = 1;
}
} else if (!value && pool->active) {
int mtu = netdev->mtu + IBMVETH_BUFF_OH;
int i;
/* Make sure there is a buffer pool with buffers that
can hold a packet of the size of the MTU */
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
if (pool == &adapter->rx_buff_pool[i])
continue;
if (!adapter->rx_buff_pool[i].active)
continue;
if (mtu <= adapter->rx_buff_pool[i].buff_size)
break;
}
if (i == IBMVETH_NUM_BUFF_POOLS) {
netdev_err(netdev, "no active pool >= MTU\n");
return -EPERM;
}
if (netif_running(netdev)) {
ibmveth_close(netdev);
pool->active = 0;
if ((rc = ibmveth_open(netdev)))
return rc;
}
pool->active = 0;
}
} else if (attr == &veth_num_attr) {
if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
return -EINVAL;
} else {
if (netif_running(netdev)) {
ibmveth_close(netdev);
pool->size = value;
if ((rc = ibmveth_open(netdev)))
return rc;
} else {
pool->size = value;
}
}
} else if (attr == &veth_size_attr) {
if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
return -EINVAL;
} else {
if (netif_running(netdev)) {
ibmveth_close(netdev);
pool->buff_size = value;
if ((rc = ibmveth_open(netdev)))
return rc;
} else {
pool->buff_size = value;
}
}
}
/* kick the interrupt handler to allocate/deallocate pools */
ibmveth_interrupt(netdev->irq, netdev);
return count;
}
#define ATTR(_name, _mode) \
struct attribute veth_##_name##_attr = { \
.name = __stringify(_name), .mode = _mode, \
};
static ATTR(active, 0644);
static ATTR(num, 0644);
static ATTR(size, 0644);
static struct attribute *veth_pool_attrs[] = {
&veth_active_attr,
&veth_num_attr,
&veth_size_attr,
NULL,
};
ATTRIBUTE_GROUPS(veth_pool);
static const struct sysfs_ops veth_pool_ops = {
.show = veth_pool_show,
.store = veth_pool_store,
};
static struct kobj_type ktype_veth_pool = {
.release = NULL,
.sysfs_ops = &veth_pool_ops,
.default_groups = veth_pool_groups,
};
static int ibmveth_resume(struct device *dev)
{
struct net_device *netdev = dev_get_drvdata(dev);
ibmveth_interrupt(netdev->irq, netdev);
return 0;
}
static const struct vio_device_id ibmveth_device_table[] = {
{ "network", "IBM,l-lan"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
static const struct dev_pm_ops ibmveth_pm_ops = {
.resume = ibmveth_resume
};
static struct vio_driver ibmveth_driver = {
.id_table = ibmveth_device_table,
.probe = ibmveth_probe,
.remove = ibmveth_remove,
.get_desired_dma = ibmveth_get_desired_dma,
.name = ibmveth_driver_name,
.pm = &ibmveth_pm_ops,
};
static int __init ibmveth_module_init(void)
{
printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
ibmveth_driver_string, ibmveth_driver_version);
return vio_register_driver(&ibmveth_driver);
}
static void __exit ibmveth_module_exit(void)
{
vio_unregister_driver(&ibmveth_driver);
}
module_init(ibmveth_module_init);
module_exit(ibmveth_module_exit);
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