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fm10k: Limit dma sync of RX buffers to actual packet size

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On packet RX, we perform a dma sync for cpu before passing the
packet up.  Here we limit that sync to the actual length of the
incoming packet, rather than always syncing the entire buffer.

Signed-off-by: Scott Peterson <scott.d.peterson@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@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:
Scott Peterson 2016-11-03 16:09:41 -07:00 committed by Jeff Kirsher
parent 6721f2dad5
commit 881571c12f
1 changed files with 5 additions and 3 deletions
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8
drivers/net/ethernet/intel/fm10k/fm10k_main.c
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@ -251,6 +251,7 @@ static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
/**
* fm10k_add_rx_frag - Add contents of Rx buffer to sk_buff
* @rx_buffer: buffer containing page to add
* @size: packet size from rx_desc
* @rx_desc: descriptor containing length of buffer written by hardware
* @skb: sk_buff to place the data into
*
@ -263,12 +264,12 @@ static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
* true if the buffer can be reused by the interface.
**/
static bool fm10k_add_rx_frag(struct fm10k_rx_buffer *rx_buffer,
unsigned int size,
union fm10k_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->w.length);
#if (PAGE_SIZE < 8192)
unsigned int truesize = FM10K_RX_BUFSZ;
#else
@ -314,6 +315,7 @@ static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
union fm10k_rx_desc *rx_desc,
struct sk_buff *skb)
{
unsigned int size = le16_to_cpu(rx_desc->w.length);
struct fm10k_rx_buffer *rx_buffer;
struct page *page;
@ -350,11 +352,11 @@ static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_buffer->dma,
rx_buffer->page_offset,
FM10K_RX_BUFSZ,
size,
DMA_FROM_DEVICE);
/* pull page into skb */
if (fm10k_add_rx_frag(rx_buffer, rx_desc, skb)) {
if (fm10k_add_rx_frag(rx_buffer, size, rx_desc, skb)) {
/* hand second half of page back to the ring */
fm10k_reuse_rx_page(rx_ring, rx_buffer);
} else {