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Commit 68b6ff58 authored by Emil Tantilov's avatar Emil Tantilov Committed by Jeff Kirsher
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ixgbevf: only DMA sync frame length 



Based on commit 64f2525c ("igb: Only DMA sync frame length")

On some architectures synching a buffer for DMA may be expensive.
Instead of the entire 2K receive buffer only synchronize the length of
the frame, which will typically be the MTU or smaller.

Signed-off-by: default avatarEmil Tantilov <emil.s.tantilov@intel.com>
Tested-by: default avatarKrishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent a355fd9a

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

+4 −3
Original line number Diff line number Diff line
@@ -803,12 +803,12 @@ static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer, 
 **/

static bool ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring,

				struct ixgbevf_rx_buffer *rx_buffer,

				u16 size,

				union ixgbe_adv_rx_desc *rx_desc,

				struct sk_buff *skb)

{

	struct page *page = rx_buffer->page;

	unsigned char *va = page_address(page) + rx_buffer->page_offset;

	unsigned int size = le16_to_cpu(rx_desc->wb.upper.length);

#if (PAGE_SIZE < 8192)

	unsigned int truesize = IXGBEVF_RX_BUFSZ;

#else
@@ -856,6 +856,7 @@ static struct sk_buff *ixgbevf_fetch_rx_buffer(struct ixgbevf_ring *rx_ring, 
{

	struct ixgbevf_rx_buffer *rx_buffer;

	struct page *page;

	u16 size = le16_to_cpu(rx_desc->wb.upper.length);



	rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];

	page = rx_buffer->page;
@@ -890,11 +891,11 @@ static struct sk_buff *ixgbevf_fetch_rx_buffer(struct ixgbevf_ring *rx_ring, 
	dma_sync_single_range_for_cpu(rx_ring->dev,

				      rx_buffer->dma,

				      rx_buffer->page_offset,

				      IXGBEVF_RX_BUFSZ,

				      size,

				      DMA_FROM_DEVICE);



	/* pull page into skb */

	if (ixgbevf_add_rx_frag(rx_ring, rx_buffer, rx_desc, skb)) {

	if (ixgbevf_add_rx_frag(rx_ring, rx_buffer, size, rx_desc, skb)) {

		/* hand second half of page back to the ring */

		ixgbevf_reuse_rx_page(rx_ring, rx_buffer);

	} else {