diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2017-01-17 08:35:44 -0800 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2017-02-16 04:02:44 -0800 |
| commit | f215af8cae4c283d8a522ea166d94f763dc4aebf (patch) | |
| tree | d8b5c1b66c107a1c707051d71d5bfeac816631a4 /drivers/net/ethernet/intel | |
| parent | af43da0dba0b1bc7af259cd7d6d76054f3acfab0 (diff) | |
| download | blackbird-op-linux-f215af8cae4c283d8a522ea166d94f763dc4aebf.tar.gz blackbird-op-linux-f215af8cae4c283d8a522ea166d94f763dc4aebf.zip | |
ixgbe: Only DMA sync frame length
On some platforms, syncing a buffer for DMA is expensive. Rather than
sync the whole 2K receive buffer, only synchronise the length of the
frame, which will typically be the MTU, or a much smaller TCP ACK.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index a19dda5711ae..dde2c852e01d 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -1841,7 +1841,7 @@ static void ixgbe_dma_sync_frag(struct ixgbe_ring *rx_ring, dma_sync_single_range_for_cpu(rx_ring->dev, IXGBE_CB(skb)->dma, frag->page_offset, - ixgbe_rx_bufsz(rx_ring), + skb_frag_size(frag), DMA_FROM_DEVICE); } IXGBE_CB(skb)->dma = 0; @@ -1983,12 +1983,11 @@ static bool ixgbe_can_reuse_rx_page(struct ixgbe_ring *rx_ring, **/ static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring, struct ixgbe_rx_buffer *rx_buffer, - union ixgbe_adv_rx_desc *rx_desc, + unsigned int size, 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 = ixgbe_rx_bufsz(rx_ring); #else @@ -2020,6 +2019,7 @@ add_tail_frag: static struct sk_buff *ixgbe_fetch_rx_buffer(struct ixgbe_ring *rx_ring, union ixgbe_adv_rx_desc *rx_desc) { + unsigned int size = le16_to_cpu(rx_desc->wb.upper.length); struct ixgbe_rx_buffer *rx_buffer; struct sk_buff *skb; struct page *page; @@ -2074,14 +2074,14 @@ dma_sync: dma_sync_single_range_for_cpu(rx_ring->dev, rx_buffer->dma, rx_buffer->page_offset, - ixgbe_rx_bufsz(rx_ring), + size, DMA_FROM_DEVICE); rx_buffer->skb = NULL; } /* pull page into skb */ - if (ixgbe_add_rx_frag(rx_ring, rx_buffer, rx_desc, skb)) { + if (ixgbe_add_rx_frag(rx_ring, rx_buffer, size, skb)) { /* hand second half of page back to the ring */ ixgbe_reuse_rx_page(rx_ring, rx_buffer); } else if (IXGBE_CB(skb)->dma == rx_buffer->dma) { |
