This change makes it so that dma_rmb is used when reading the Rx descriptor. The advantage of dma_rmb is that it allows for a much lower cost barrier on x86, powerpc, arm, and arm64 architectures than a traditional memory barrier when dealing with reads that only have to synchronize to coherent memory. In addition I have updated the code so that it just checks to see if any bits have been set instead of just the DD bit since the DD bit will always be set as a part of a descriptor write-back so we just need to check for a non-zero value being present at that memory location rather than just checking for any specific bit. This allows the code itself to appear much cleaner and allows the compiler more room to optimize. Cc: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx> Cc: Matthew Vick <matthew.vick@xxxxxxxxx> Cc: Don Skidmore <donald.c.skidmore@xxxxxxxxx> Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx> --- drivers/net/ethernet/intel/fm10k/fm10k_main.c | 6 +++--- drivers/net/ethernet/intel/igb/igb_main.c | 6 +++--- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 9 ++++----- 3 files changed, 10 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c index e645af4..06e2d65 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c @@ -620,14 +620,14 @@ static bool fm10k_clean_rx_irq(struct fm10k_q_vector *q_vector, rx_desc = FM10K_RX_DESC(rx_ring, rx_ring->next_to_clean); - if (!fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_DD)) + if (!rx_desc->d.staterr) break; /* This memory barrier is needed to keep us from reading * any other fields out of the rx_desc until we know the - * RXD_STATUS_DD bit is set + * descriptor has been written back */ - rmb(); + dma_rmb(); /* retrieve a buffer from the ring */ skb = fm10k_fetch_rx_buffer(rx_ring, rx_desc, skb); diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index a2d72a8..2246f45 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6918,14 +6918,14 @@ static bool igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget) rx_desc = IGB_RX_DESC(rx_ring, rx_ring->next_to_clean); - if (!igb_test_staterr(rx_desc, E1000_RXD_STAT_DD)) + if (!rx_desc->wb.upper.status_error) break; /* This memory barrier is needed to keep us from reading * any other fields out of the rx_desc until we know the - * RXD_STAT_DD bit is set + * descriptor has been written back */ - rmb(); + dma_rmb(); /* retrieve a buffer from the ring */ skb = igb_fetch_rx_buffer(rx_ring, rx_desc, skb); diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index d2df4e3..d814b58 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -2003,15 +2003,14 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector, rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean); - if (!ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_DD)) + if (!rx_desc->wb.upper.status_error) break; - /* - * This memory barrier is needed to keep us from reading + /* This memory barrier is needed to keep us from reading * any other fields out of the rx_desc until we know the - * RXD_STAT_DD bit is set + * descriptor has been written back */ - rmb(); + dma_rmb(); /* retrieve a buffer from the ring */ skb = ixgbe_fetch_rx_buffer(rx_ring, rx_desc); -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
