[PATCH v8 7/7] ixgbevf: eliminate duplicate barriers on weakly-ordered archs

[Sinan Kaya]

memory-barriers.txt has been updated as follows:

"When using writel(), a prior wmb() is not needed to guarantee that the
cache coherent memory writes have completed before writing to the MMIO
region."

Remove old IA-64 comments in the code along with unneeded wmb() in front
of writel().

There are places in the code where wmb() has been used as a double barrier
for CPU and IO in place of smp_wmb() and wmb() as an optimization. For
such places, keep the wmb() but replace the following writel() with
writel_relaxed() to have a sequence as

wmb()
writel_relaxed()
mmio_wb()

Signed-off-by: Sinan Kaya <ok...@codeaurora.org>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c 
b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 757dac6..29b71a7 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -719,12 +719,6 @@ static void ixgbevf_alloc_rx_buffers(struct ixgbevf_ring 
*rx_ring,
                /* update next to alloc since we have filled the ring */
                rx_ring->next_to_alloc = i;
 
-               /* Force memory writes to complete before letting h/w
-                * know there are new descriptors to fetch.  (Only
-                * applicable for weak-ordered memory model archs,
-                * such as IA-64).
-                */
-               wmb();
                writel(i, rx_ring->tail);
        }
 }
@@ -1228,10 +1222,6 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector 
*q_vector,
                struct ixgbevf_ring *xdp_ring =
                        adapter->xdp_ring[rx_ring->queue_index];
 
-               /* Force memory writes to complete before letting h/w
-                * know there are new descriptors to fetch.
-                */
-               wmb();
                writel(xdp_ring->next_to_use, xdp_ring->tail);
        }
 
@@ -3985,11 +3975,7 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
        /* set the timestamp */
        first->time_stamp = jiffies;
 
-       /* Force memory writes to complete before letting h/w know there
-        * are new descriptors to fetch.  (Only applicable for weak-ordered
-        * memory model archs, such as IA-64).
-        *
-        * We also need this memory barrier (wmb) to make certain all of the
+       /* We also need this memory barrier (wmb) to make certain all of the
         * status bits have been updated before next_to_watch is written.
         */
        wmb();
@@ -4004,7 +3990,12 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
        tx_ring->next_to_use = i;
 
        /* notify HW of packet */
-       writel(i, tx_ring->tail);
+       writel_relaxed(i, tx_ring->tail);
+
+       /* We need this if more than one processor can write to our tail
+        * at a time, it synchronizes IO on IA64/Altix systems
+        */
+       mmiowb();
 
        return;
 dma_error:
-- 
2.7.4