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[netdrvr] sfc: Add TSO support

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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>
This commit is contained in:
Ben Hutchings
2008-05-07 12:51:12 +01:00
committed by Jeff Garzik
parent 48cfb14f8b
commit b9b39b625c
4 changed files with 708 additions and 1 deletions
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4
drivers/net/sfc/efx.c
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@ -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;