From: Jesse Brandeburg Date: Mon, 26 Oct 2015 23:44:30 +0000 (-0400) Subject: i40e/i40evf: prefetch skb data on transmit X-Git-Tag: v4.1.12-92~189^2~215 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=19770ef8f5cda54028ee98d65767d04313677474;p=users%2Fjedix%2Flinux-maple.git i40e/i40evf: prefetch skb data on transmit Orabug: 22342532 Issue a prefetch for data early in the transmit path. This should not be generally needed for Tx traffic, but it helps immensely for pktgen workloads and should help for forwarding workloads as well. Change-ID: Iefee870c20599e0c4240e1d8637e4f16b625f83a Signed-off-by: Jesse Brandeburg Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher (cherry picked from commit b74118f08356fd8ab6cb5d1a15705a2760c9afdd) Signed-off-by: Brian Maly --- diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 957a6f03f7ad5..cd1cbd0764d5b 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -2805,6 +2805,9 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, int tsyn; int tso; + /* prefetch the data, we'll need it later */ + prefetch(skb->data); + if (0 == i40e_xmit_descriptor_count(skb, tx_ring)) return NETDEV_TX_BUSY; diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index e1ae609be29d6..102243c8b4ae4 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -1992,6 +1992,9 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, u8 hdr_len = 0; int tso; + /* prefetch the data, we'll need it later */ + prefetch(skb->data); + if (0 == i40evf_xmit_descriptor_count(skb, tx_ring)) return NETDEV_TX_BUSY;