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amd-xgbe: Provide support for receive side scaling

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This patch provides support for receive side scaling (RSS). RSS allows
for spreading incoming network packets across the Rx queues.  When used
in conjunction with the per DMA channel interrupt support, this allows
the receive processing to be spread across multiple processors.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas
2014-11-04 16:07:02 -06:00
committed by David S. Miller
parent 9227dc5e57
commit 5b9dfe299e
5 changed files with 233 additions and 2 deletions
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16
drivers/net/ethernet/amd/xgbe/xgbe-drv.c
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@@ -1661,12 +1661,21 @@ static int xgbe_set_features(struct net_device *netdev,
{
struct xgbe_prv_data *pdata = netdev_priv(netdev);
struct xgbe_hw_if *hw_if = &pdata->hw_if;
netdev_features_t rxcsum, rxvlan, rxvlan_filter;
netdev_features_t rxhash, rxcsum, rxvlan, rxvlan_filter;
int ret = 0;
rxhash = pdata->netdev_features & NETIF_F_RXHASH;
rxcsum = pdata->netdev_features & NETIF_F_RXCSUM;
rxvlan = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_RX;
rxvlan_filter = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_FILTER;
if ((features & NETIF_F_RXHASH) && !rxhash)
ret = hw_if->enable_rss(pdata);
else if (!(features & NETIF_F_RXHASH) && rxhash)
ret = hw_if->disable_rss(pdata);
if (ret)
return ret;
if ((features & NETIF_F_RXCSUM) && !rxcsum)
hw_if->enable_rx_csum(pdata);
else if (!(features & NETIF_F_RXCSUM) && rxcsum)
@@ -1960,6 +1969,11 @@ read_again:
hwtstamps->hwtstamp = ns_to_ktime(nsec);
}
if (XGMAC_GET_BITS(packet->attributes,
RX_PACKET_ATTRIBUTES, RSS_HASH))
skb_set_hash(skb, packet->rss_hash,
packet->rss_hash_type);
skb->dev = netdev;
skb->protocol = eth_type_trans(skb, netdev);
skb_record_rx_queue(skb, channel->queue_index);