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Message-Id: <200708171416.l7HEGVe5000602@d01av03.pok.ibm.com>
Date: Fri, 17 Aug 2007 09:16:31 -0500
From: Brian King <brking@...ux.vnet.ibm.com>
To: jeff@...zik.org
Cc: santil@...ux.vnet.ibm.com, rcjenn@...ux.vnet.ibm.com,
netdev@...r.kernel.org, linuxppc-dev@...abs.org,
brking@...ux.vnet.ibm.com
Subject: [PATCH 2/6] 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@...ux.vnet.ibm.com>
---
linux-2.6-bjking1/drivers/net/ibmveth.c | 125 +++++++++++++++++++++++++++++++-
linux-2.6-bjking1/drivers/net/ibmveth.h | 1
2 files changed, 124 insertions(+), 2 deletions(-)
diff -puN drivers/net/ibmveth.c~ibmveth_csum_offload_ethtool drivers/net/ibmveth.c
--- linux-2.6/drivers/net/ibmveth.c~ibmveth_csum_offload_ethtool 2007-08-09 15:15:07.000000000 -0500
+++ linux-2.6-bjking1/drivers/net/ibmveth.c 2007-08-09 15:15:07.000000000 -0500
@@ -641,12 +641,132 @@ static u32 netdev_get_link(struct net_de
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(struc
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);
}
diff -puN drivers/net/ibmveth.h~ibmveth_csum_offload_ethtool drivers/net/ibmveth.h
--- linux-2.6/drivers/net/ibmveth.h~ibmveth_csum_offload_ethtool 2007-08-09 15:15:07.000000000 -0500
+++ linux-2.6-bjking1/drivers/net/ibmveth.h 2007-08-09 15:15:07.000000000 -0500
@@ -137,6 +137,7 @@ 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;
_
-
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