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ibmveth: Implement ethtool hooks to enable/disable checksum offload 

This patch adds the appropriate ethtool hooks to allow for enabling/disabling
of hypervisor assisted checksum offload for TCP.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Brian King 2007-08-17 09:16:31 -05:00 committed by David S. Miller
parent f4ff28720f
commit 5fc7e01cb7
2 changed files with 124 additions and 2 deletions
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125
drivers/net/ibmveth.c
View File

@ -652,12 +652,132 @@ static u32 netdev_get_link(struct net_device *dev) {
return 1;
}
static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = dev->priv;
if (data)
adapter->rx_csum = 1;
else {
/*
* 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.
*/
adapter->rx_csum = 0;
dev->features &= ~NETIF_F_IP_CSUM;
}
}
static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = dev->priv;
if (data) {
dev->features |= NETIF_F_IP_CSUM;
adapter->rx_csum = 1;
} else
dev->features &= ~NETIF_F_IP_CSUM;
}
static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
void (*done) (struct net_device *, u32))
{
struct ibmveth_adapter *adapter = dev->priv;
union ibmveth_illan_attributes set_attr, clr_attr, ret_attr;
long ret;
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.desc = 0;
clr_attr.desc = 0;
if (data)
set_attr.fields.tcp_csum_offload_ipv4 = 1;
else
clr_attr.fields.tcp_csum_offload_ipv4 = 1;
ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr.desc);
if (ret == H_SUCCESS && !ret_attr.fields.active_trunk &&
!ret_attr.fields.trunk_priority &&
ret_attr.fields.csum_offload_padded_pkt_support) {
ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr.desc,
set_attr.desc, &ret_attr.desc);
if (ret != H_SUCCESS) {
rc1 = -EIO;
ibmveth_error_printk("unable to change checksum offload settings."
" %d rc=%ld\n", data, ret);
ret = h_illan_attributes(adapter->vdev->unit_address,
set_attr.desc, clr_attr.desc, &ret_attr.desc);
} else
done(dev, data);
} else {
rc1 = -EIO;
ibmveth_error_printk("unable to change checksum offload settings."
" %d rc=%ld ret_attr=%lx\n", data, ret, ret_attr.desc);
}
if (restart)
rc2 = ibmveth_open(dev);
return rc1 ? rc1 : rc2;
}
static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = dev->priv;
if ((data && adapter->rx_csum) || (!data && !adapter->rx_csum))
return 0;
return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
}
static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
{
struct ibmveth_adapter *adapter = dev->priv;
int rc = 0;
if (data && (dev->features & NETIF_F_IP_CSUM))
return 0;
if (!data && !(dev->features & NETIF_F_IP_CSUM))
return 0;
if (data && !adapter->rx_csum)
rc = ibmveth_set_csum_offload(dev, data, ibmveth_set_tx_csum_flags);
else
ibmveth_set_tx_csum_flags(dev, data);
return rc;
}
static u32 ibmveth_get_rx_csum(struct net_device *dev)
{
struct ibmveth_adapter *adapter = dev->priv;
return adapter->rx_csum;
}
static const struct ethtool_ops netdev_ethtool_ops = {
.get_drvinfo = netdev_get_drvinfo,
.get_settings = netdev_get_settings,
.get_link = netdev_get_link,
.get_sg = ethtool_op_get_sg,
.get_tx_csum = ethtool_op_get_tx_csum,
.set_tx_csum = ibmveth_set_tx_csum,
.get_rx_csum = ibmveth_get_rx_csum,
.set_rx_csum = ibmveth_set_rx_csum,
};
static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
@ -1103,9 +1223,10 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
ret = h_illan_attributes(dev->unit_address, 0, set_attr.desc,
&ret_attr.desc);
if (ret == H_SUCCESS)
if (ret == H_SUCCESS) {
adapter->rx_csum = 1;
netdev->features |= NETIF_F_IP_CSUM;
else
} else
ret = h_illan_attributes(dev->unit_address, set_attr.desc,
0, &ret_attr.desc);
}

1
drivers/net/ibmveth.h
View File

@ -138,6 +138,7 @@ struct ibmveth_adapter {
struct ibmveth_buff_pool rx_buff_pool[IbmVethNumBufferPools];
struct ibmveth_rx_q rx_queue;
int pool_config;
int rx_csum;
/* adapter specific stats */
u64 replenish_task_cycles;