Commit 21fa4e66 authored Jun 04, 2009 by Alexander Duyck Committed by David S. Miller Jun 07, 2009

ixgbe: use rx_buffer_info->dma instead of nr_frags to determine skb unmap

This patch changes the driver so that it uses rx_buffer_info->dma to
determine if it needs to unmap the page instead of sh_info->nr_frags. This
helps to prevent a cache line miss when receiving small packets as the
rx_buffer_info data should already be in the cache.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 74766013

drivers/net/ixgbe/ixgbe_main.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -708,7 +708,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
		prefetch(skb->data - NET_IP_ALIGN);
		rx_buffer_info->skb = NULL;

		if (len && !skb_shinfo(skb)->nr_frags) {
		if (rx_buffer_info->dma) {
		pci_unmap_single(pdev, rx_buffer_info->dma,
		rx_ring->rx_buf_len,
		PCI_DMA_FROMDEVICE);