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ixgbevf: use length to determine if descriptor is done 

Based on:
commit 7ec0116c91 ("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.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 10:36:59 -08:00 committed by Jeff Kirsher
parent 68b6ff5825
commit 24bff091d7
1 changed files with 8 additions and 6 deletions
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14
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -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);
}
/**