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ibmveth: add support for TSO6

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This patch adds support for a new method of signalling the firmware
that TSO packets are being sent. The new method removes the need to
alter the ip and tcp checksums and allows TSO6 support.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Falcon
2015-07-14 10:51:51 -05:00
committed by David S. Miller
parent 2de8530ba0
commit 07e6a97da1
2 changed files with 135 additions and 28 deletions
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145
drivers/net/ethernet/ibm/ibmveth.c
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@@ -79,6 +79,11 @@ 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, S_IRUGO);
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;
@@ -101,7 +106,8 @@ struct ibmveth_stat ibmveth_stats[] = {
{ "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) }
{ "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 */
@@ -848,25 +854,91 @@ static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
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;
adapter->pool_config = 1;
ibmveth_close(dev);
adapter->pool_config = 0;
}
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 rc;
netdev_features_t changed = features ^ dev->features;
int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
int rc1 = 0, rc2 = 0;
if (features & NETIF_F_TSO & changed)
netdev_info(dev, "TSO feature requires all partitions to have updated driver");
if (rx_csum != adapter->rx_csum) {
rc1 = ibmveth_set_csum_offload(dev, rx_csum);
if (rc1 && !adapter->rx_csum)
dev->features =
features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
}
if (rx_csum == adapter->rx_csum)
return 0;
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);
}
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;
return rc1 ? rc1 : rc2;
}
static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
@@ -917,7 +989,7 @@ static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
static int ibmveth_send(struct ibmveth_adapter *adapter,
union ibmveth_buf_desc *descs)
union ibmveth_buf_desc *descs, unsigned long mss)
{
unsigned long correlator;
unsigned int retry_count;
@@ -934,7 +1006,8 @@ static int ibmveth_send(struct ibmveth_adapter *adapter,
descs[0].desc, descs[1].desc,
descs[2].desc, descs[3].desc,
descs[4].desc, descs[5].desc,
correlator, &correlator);
correlator, &correlator, mss,
adapter->fw_large_send_support);
} while ((ret == H_BUSY) && (retry_count--));
if (ret != H_SUCCESS && ret != H_DROPPED) {
@@ -955,6 +1028,7 @@ static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
int last, i;
int force_bounce = 0;
dma_addr_t dma_addr;
unsigned long mss = 0;
/*
* veth handles a maximum of 6 segments including the header, so
@@ -980,6 +1054,9 @@ static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
desc_flags = IBMVETH_BUF_VALID;
if (skb_is_gso(skb) && adapter->fw_large_send_support)
desc_flags |= IBMVETH_BUF_LRG_SND;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
unsigned char *buf = skb_transport_header(skb) +
skb->csum_offset;
@@ -1007,7 +1084,7 @@ retry_bounce:
descs[0].fields.flags_len = desc_flags | skb->len;
descs[0].fields.address = adapter->bounce_buffer_dma;
if (ibmveth_send(adapter, descs)) {
if (ibmveth_send(adapter, descs, 0)) {
adapter->tx_send_failed++;
netdev->stats.tx_dropped++;
} else {
@@ -1041,16 +1118,23 @@ retry_bounce:
descs[i+1].fields.address = dma_addr;
}
if (skb_is_gso(skb) && !skb_is_gso_v6(skb)) {
/* Put -1 in the IP checksum to tell phyp it
* is a largesend packet and 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++;
if (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++;
}
}
if (ibmveth_send(adapter, descs)) {
if (ibmveth_send(adapter, descs, mss)) {
adapter->tx_send_failed++;
netdev->stats.tx_dropped++;
} else {
@@ -1401,6 +1485,8 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
struct ibmveth_adapter *adapter;
unsigned char *mac_addr_p;
unsigned int *mcastFilterSize_p;
long ret;
unsigned long ret_attr;
dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
dev->unit_address);
@@ -1449,10 +1535,19 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
SET_NETDEV_DEV(netdev, &dev->dev);
netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
netdev->features |= netdev->hw_features;
/* TSO is disabled by default */
netdev->hw_features |= NETIF_F_TSO;
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;
}
memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);