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Commit 489ce7a4 authored by Jesse Brandeburg's avatar Jesse Brandeburg Committed by Jeff Kirsher
Browse files

i40e/i40evf: improve Tx performance with a small tweak 



Add a prefetch for the next Tx descriptor to be used when we know
there are more coming.

Change-ID: Ibb9acab11d508eec2db7da795df74debc16eeacb
Signed-off-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: default avatarJim Young <james.m.young@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent c78b953e

drivers/net/ethernet/intel/i40e/i40e_txrx.c

+2 −0
Original line number Diff line number Diff line
@@ -2616,6 +2616,8 @@ static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, 
	    netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev,

						   tx_ring->queue_index)))

		writel(i, tx_ring->tail);

	else

		prefetchw(tx_desc + 1);



	return;

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

+2 −0
Original line number Diff line number Diff line
@@ -1841,6 +1841,8 @@ static inline void i40evf_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, 
	    netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev,

						   tx_ring->queue_index)))

		writel(i, tx_ring->tail);

	else

		prefetchw(tx_desc + 1);



	return;