i40e/i40evf: Limit DMA sync of RX buffers to actual packet size

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.

Change-ID: I626aaf6c37275a8ce9e81efcaa773f327b331487
Signed-off-by: Scott Peterson <scott.d.peterson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index f5baeb154d395ded017a23ea4ac103332a46106e..4852445122d97b871646955ff8d12cf43dac8ef0 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1525,7 +1525,7 @@ static inline bool i40e_page_is_reserved(struct page *page)
  * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff
  * @rx_ring: rx descriptor ring to transact packets on
  * @rx_buffer: buffer containing page to add
- * @rx_desc: descriptor containing length of buffer written by hardware
+ * @size: packet length from rx_desc
  * @skb: sk_buff to place the data into
  *
  * This function will add the data contained in rx_buffer->page to the skb.
@@ -1538,13 +1538,10 @@ static inline bool i40e_page_is_reserved(struct page *page)
  **/
 static bool i40e_add_rx_frag(struct i40e_ring *rx_ring,
                             struct i40e_rx_buffer *rx_buffer,
-                            union i40e_rx_desc *rx_desc,
+                            unsigned int size,
                             struct sk_buff *skb)
 {
        struct page *page = rx_buffer->page;
-       u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
-       unsigned int size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
-                           I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 #if (PAGE_SIZE < 8192)
        unsigned int truesize = I40E_RXBUFFER_2048;
 #else
@@ -1613,6 +1610,11 @@ static inline
 struct sk_buff *i40e_fetch_rx_buffer(struct i40e_ring *rx_ring,
                                     union i40e_rx_desc *rx_desc)
 {
+       u64 local_status_error_len =
+               le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+       unsigned int size =
+               (local_status_error_len & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
+               I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
        struct i40e_rx_buffer *rx_buffer;
        struct sk_buff *skb;
        struct page *page;
@@ -1654,11 +1656,11 @@ struct sk_buff *i40e_fetch_rx_buffer(struct i40e_ring *rx_ring,
        dma_sync_single_range_for_cpu(rx_ring->dev,
                                      rx_buffer->dma,
                                      rx_buffer->page_offset,
-                                     I40E_RXBUFFER_2048,
+                                     size,
                                      DMA_FROM_DEVICE);
 
        /* pull page into skb */
-       if (i40e_add_rx_frag(rx_ring, rx_buffer, rx_desc, skb)) {
+       if (i40e_add_rx_frag(rx_ring, rx_buffer, size, skb)) {
                /* hand second half of page back to the ring */
                i40e_reuse_rx_page(rx_ring, rx_buffer);
                rx_ring->rx_stats.page_reuse_count++;

diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index d4e488267988c21909f2eb9e922758c3b7df5c9b..4264d9133366def053138eaf1edb0a7aa92ddf11 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1003,7 +1003,7 @@ static inline bool i40e_page_is_reserved(struct page *page)
  * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff
  * @rx_ring: rx descriptor ring to transact packets on
  * @rx_buffer: buffer containing page to add
- * @rx_desc: descriptor containing length of buffer written by hardware
+ * @size: packet length from rx_desc
  * @skb: sk_buff to place the data into
  *
  * This function will add the data contained in rx_buffer->page to the skb.
@@ -1016,13 +1016,10 @@ static inline bool i40e_page_is_reserved(struct page *page)
  **/
 static bool i40e_add_rx_frag(struct i40e_ring *rx_ring,
                             struct i40e_rx_buffer *rx_buffer,
-                            union i40e_rx_desc *rx_desc,
+                            unsigned int size,
                             struct sk_buff *skb)
 {
        struct page *page = rx_buffer->page;
-       u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
-       unsigned int size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
-                           I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 #if (PAGE_SIZE < 8192)
        unsigned int truesize = I40E_RXBUFFER_2048;
 #else
@@ -1091,6 +1088,11 @@ static inline
 struct sk_buff *i40evf_fetch_rx_buffer(struct i40e_ring *rx_ring,
                                       union i40e_rx_desc *rx_desc)
 {
+       u64 local_status_error_len =
+               le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+       unsigned int size =
+               (local_status_error_len & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
+               I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
        struct i40e_rx_buffer *rx_buffer;
        struct sk_buff *skb;
        struct page *page;
@@ -1132,11 +1134,11 @@ struct sk_buff *i40evf_fetch_rx_buffer(struct i40e_ring *rx_ring,
        dma_sync_single_range_for_cpu(rx_ring->dev,
                                      rx_buffer->dma,
                                      rx_buffer->page_offset,
-                                     I40E_RXBUFFER_2048,
+                                     size,
                                      DMA_FROM_DEVICE);
 
        /* pull page into skb */
-       if (i40e_add_rx_frag(rx_ring, rx_buffer, rx_desc, skb)) {
+       if (i40e_add_rx_frag(rx_ring, rx_buffer, size, skb)) {
                /* hand second half of page back to the ring */
                i40e_reuse_rx_page(rx_ring, rx_buffer);
                rx_ring->rx_stats.page_reuse_count++;