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| author | Jiangfeng Xiao <xiaojiangfeng@huawei.com> | 2019-10-28 13:09:46 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:25:27 +0100 |
| commit | f0a12f90bb6a5c1a88cc887a27aae4d4db0ca20e (patch) | |
| tree | f5348472bdb5125622e585dd4499fb945c5db047 | |
| parent | a704289342f8efe32c0270d25b9e0e05481e8ed1 (diff) | |
| download | linux-stable-f0a12f90bb6a5c1a88cc887a27aae4d4db0ca20e.tar.gz linux-stable-f0a12f90bb6a5c1a88cc887a27aae4d4db0ca20e.tar.bz2 linux-stable-f0a12f90bb6a5c1a88cc887a27aae4d4db0ca20e.zip | |
net: hisilicon: Fix ping latency when deal with high throughput
[ Upstream commit e56bd641ca61beb92b135298d5046905f920b734 ]
This is due to error in over budget processing.
When dealing with high throughput, the used buffers
that exceeds the budget is not cleaned up. In addition,
it takes a lot of cycles to clean up the used buffer,
and then the buffer where the valid data is located can take effect.
Signed-off-by: Jiangfeng Xiao <xiaojiangfeng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hip04_eth.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/ethernet/hisilicon/hip04_eth.c b/drivers/net/ethernet/hisilicon/hip04_eth.c index 1bfe9544b3c1..17cbe8145dcd 100644 --- a/drivers/net/ethernet/hisilicon/hip04_eth.c +++ b/drivers/net/ethernet/hisilicon/hip04_eth.c @@ -174,6 +174,7 @@ struct hip04_priv { dma_addr_t rx_phys[RX_DESC_NUM]; unsigned int rx_head; unsigned int rx_buf_size; + unsigned int rx_cnt_remaining; struct device_node *phy_node; struct phy_device *phy; @@ -487,7 +488,6 @@ static int hip04_rx_poll(struct napi_struct *napi, int budget) struct hip04_priv *priv = container_of(napi, struct hip04_priv, napi); struct net_device *ndev = priv->ndev; struct net_device_stats *stats = &ndev->stats; - unsigned int cnt = hip04_recv_cnt(priv); struct rx_desc *desc; struct sk_buff *skb; unsigned char *buf; @@ -500,8 +500,8 @@ static int hip04_rx_poll(struct napi_struct *napi, int budget) /* clean up tx descriptors */ tx_remaining = hip04_tx_reclaim(ndev, false); - - while (cnt && !last) { + priv->rx_cnt_remaining += hip04_recv_cnt(priv); + while (priv->rx_cnt_remaining && !last) { buf = priv->rx_buf[priv->rx_head]; skb = build_skb(buf, priv->rx_buf_size); if (unlikely(!skb)) { @@ -547,11 +547,13 @@ refill: hip04_set_recv_desc(priv, phys); priv->rx_head = RX_NEXT(priv->rx_head); - if (rx >= budget) + if (rx >= budget) { + --priv->rx_cnt_remaining; goto done; + } - if (--cnt == 0) - cnt = hip04_recv_cnt(priv); + if (--priv->rx_cnt_remaining == 0) + priv->rx_cnt_remaining += hip04_recv_cnt(priv); } if (!(priv->reg_inten & RCV_INT)) { @@ -636,6 +638,7 @@ static int hip04_mac_open(struct net_device *ndev) int i; priv->rx_head = 0; + priv->rx_cnt_remaining = 0; priv->tx_head = 0; priv->tx_tail = 0; hip04_reset_ppe(priv); |