From: Alexander Duyck Date: Thu, 4 Jun 2009 15:59:49 +0000 (+0000) Subject: ixgbe: use rx_buffer_info->dma instead of nr_frags to determine skb unmap X-Git-Tag: v2.6.31-rc1~330^2~149 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=21fa4e66bd0bedfa4ed6aa6f7008b2aff6d45c8d;p=~shefty%2Frdma-dev.git 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 Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index 9684632f15b..e1efa1d7df4 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -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);