[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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 59edcf793c19..418f2e53a95b 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -1873,6 +1873,7 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
                 tx_queue->queue = i;
                 tx_queue->buffer = NULL;
                 tx_queue->channel = &efx->channel[0]; /* for safety */
+                tx_queue->tso_headers_free = NULL;
         }
         for (i = 0; i < EFX_MAX_RX_QUEUES; i++) {
                 rx_queue = &efx->rx_queue[i];
@@ -2071,7 +2072,8 @@ static int __devinit efx_pci_probe(struct pci_dev *pci_dev,
         net_dev = alloc_etherdev(sizeof(*efx));
         if (!net_dev)
                 return -ENOMEM;
-        net_dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA;
+        net_dev->features |= (NETIF_F_IP_CSUM | NETIF_F_SG |
+                              NETIF_F_HIGHDMA | NETIF_F_TSO);
         if (lro)
                 net_dev->features |= NETIF_F_LRO;
         efx = net_dev->priv;