[net-next 03/15] ixgbevf: use length to determine if descriptor is done

[Jeff Kirsher]

From: Emil Tantilov <emil.s.tanti...@intel.com>

Based on:
commit 7ec0116c9131 ("igb: Use length to determine if descriptor is done")

This change makes it so that we use the length of the packet instead of the
DD status bit to determine if a new descriptor is ready to be processed.
The obvious advantage is that it cuts down on reads as we don't really even
need the DD bit if going from a 0 to a non-zero value on size is enough to
inform us that the packet has been completed.

In addition we only reset the Rx descriptor length for descriptor zero when
resetting a ring instead of having to do a memset with 0 over the entire
ring. By doing this we can save some time on initialization.

Signed-off-by: Emil Tantilov <emil.s.tanti...@intel.com>
Tested-by: Krishneil Singh <krishneil.k.si...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c 
b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 0cc2688671ec..725fe2dca868 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -653,8 +653,8 @@ static void ixgbevf_alloc_rx_buffers(struct ixgbevf_ring 
*rx_ring,
                        i -= rx_ring->count;
                }
 
-               /* clear the hdr_addr for the next_to_use descriptor */
-               rx_desc->read.hdr_addr = 0;
+               /* clear the length for the next_to_use descriptor */
+               rx_desc->wb.upper.length = 0;
 
                cleaned_count--;
        } while (cleaned_count);
@@ -938,7 +938,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector 
*q_vector,
 
                rx_desc = IXGBEVF_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
-               if (!ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_DD))
+               if (!rx_desc->wb.upper.length)
                        break;
 
                /* This memory barrier is needed to keep us from reading
@@ -1729,6 +1729,7 @@ static void ixgbevf_configure_rx_ring(struct 
ixgbevf_adapter *adapter,
                                      struct ixgbevf_ring *ring)
 {
        struct ixgbe_hw *hw = &adapter->hw;
+       union ixgbe_adv_rx_desc *rx_desc;
        u64 rdba = ring->dma;
        u32 rxdctl;
        u8 reg_idx = ring->reg_idx;
@@ -1757,6 +1758,10 @@ static void ixgbevf_configure_rx_ring(struct 
ixgbevf_adapter *adapter,
        IXGBE_WRITE_REG(hw, IXGBE_VFRDT(reg_idx), 0);
        ring->tail = adapter->io_addr + IXGBE_VFRDT(reg_idx);
 
+       /* initialize Rx descriptor 0 */
+       rx_desc = IXGBEVF_RX_DESC(ring, 0);
+       rx_desc->wb.upper.length = 0;
+
        /* reset ntu and ntc to place SW in sync with hardwdare */
        ring->next_to_clean = 0;
        ring->next_to_use = 0;
@@ -2141,9 +2146,6 @@ static void ixgbevf_clean_rx_ring(struct ixgbevf_ring 
*rx_ring)
 
        size = sizeof(struct ixgbevf_rx_buffer) * rx_ring->count;
        memset(rx_ring->rx_buffer_info, 0, size);
-
-       /* Zero out the descriptor ring */
-       memset(rx_ring->desc, 0, rx_ring->size);
 }
 
 /**
-- 
2.14.3