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ixgbevf: only DMA sync frame length

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Based on commit 64f2525ca4e7 ("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: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2017-12-11 10:36:54 -08:00 committed by Jeff Kirsher
parent a355fd9a1b
commit 68b6ff5825
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
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@ -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 {