[netdrvr] sfc: Add TSO support
The SFC4000 controller does not have hardware support for TSO, and the
core GSO code incurs a high cost in allocating and freeing skbs. This
TSO implementation uses lightweight packet header structures and is
substantially faster.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index ad541ba..b756840 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -272,6 +272,22 @@
}
}
+static int efx_ethtool_set_tso(struct net_device *net_dev, u32 enable)
+{
+ int rc;
+
+ /* Our TSO requires TX checksumming, so force TX checksumming
+ * on when TSO is enabled.
+ */
+ if (enable) {
+ rc = efx_ethtool_set_tx_csum(net_dev, 1);
+ if (rc)
+ return rc;
+ }
+
+ return ethtool_op_set_tso(net_dev, enable);
+}
+
static int efx_ethtool_set_tx_csum(struct net_device *net_dev, u32 enable)
{
struct efx_nic *efx = net_dev->priv;
@@ -283,6 +299,15 @@
efx_flush_queues(efx);
+ /* Our TSO requires TX checksumming, so disable TSO when
+ * checksumming is disabled
+ */
+ if (!enable) {
+ rc = efx_ethtool_set_tso(net_dev, 0);
+ if (rc)
+ return rc;
+ }
+
return 0;
}
@@ -451,6 +476,8 @@
.set_tx_csum = efx_ethtool_set_tx_csum,
.get_sg = ethtool_op_get_sg,
.set_sg = ethtool_op_set_sg,
+ .get_tso = ethtool_op_get_tso,
+ .set_tso = efx_ethtool_set_tso,
.get_flags = ethtool_op_get_flags,
.set_flags = ethtool_op_set_flags,
.get_strings = efx_ethtool_get_strings,