net: hns3: use writel() to optimize the barrier operation

writel() can be used to order I/O vs memory by default when
writing portable drivers. Use writel() to replace wmb() +
writel_relaxed(), and writel() is dma_wmb() + writel_relaxed()
for ARM64, so there is an optimization here because dma_wmb()
is a lighter barrier than wmb().

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 8490754036d58145c0bbff104dc879c890411666..4a49a76c818ff171fca55ef52f8579f55949e894 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1398,9 +1398,8 @@ static void hns3_tx_doorbell(struct hns3_enet_ring *ring, int num,
        if (!ring->pending_buf)
                return;
 
-       wmb(); /* Commit all data before submit */
-
-       hnae3_queue_xmit(ring->tqp, ring->pending_buf);
+       writel(ring->pending_buf,
+              ring->tqp->io_base + HNS3_RING_TX_RING_TAIL_REG);
        ring->pending_buf = 0;
        WRITE_ONCE(ring->last_to_use, ring->next_to_use);
 }
@@ -2618,8 +2617,7 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
                ring_ptr_move_fw(ring, next_to_use);
        }
 
-       wmb(); /* Make all data has been write before submit */
-       writel_relaxed(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
+       writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
 }
 
 static bool hns3_page_is_reusable(struct page *page)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
index 876dc09ac1221522192f9a09b09a4815d77c814c..20e62cec488db0e56fcc2e08d48fe7d27c218fa6 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -539,9 +539,6 @@ static inline bool hns3_nic_resetting(struct net_device *netdev)
 #define hns3_write_dev(a, reg, value) \
        hns3_write_reg((a)->io_base, (reg), (value))
 
-#define hnae3_queue_xmit(tqp, buf_num) writel_relaxed(buf_num, \
-               (tqp)->io_base + HNS3_RING_TX_RING_TAIL_REG)
-
 #define ring_to_dev(ring) ((ring)->dev)
 
 #define ring_to_netdev(ring)   ((ring)->tqp_vector->napi.dev)