From f6061a056c8b5cc76f23e61859519ea555b9e6fc Mon Sep 17 00:00:00 2001 From: Yunsheng Lin Date: Wed, 16 Sep 2020 17:33:46 +0800 Subject: [PATCH] net: hns3: batch tx doorbell operation Use netdev_xmit_more() to defer the tx doorbell operation when the skb is passed to the driver continuously. By doing this we can improve the overall xmit performance by avoid some doorbell operations. Also, the tx_err_cnt stat is not used, so rename it to tx_more stat. Signed-off-by: Yunsheng Lin Signed-off-by: Huazhong Tan Signed-off-by: David S. Miller --- .../net/ethernet/hisilicon/hns3/hns3_enet.c | 47 +++++++++++++++---- .../net/ethernet/hisilicon/hns3/hns3_enet.h | 2 +- .../ethernet/hisilicon/hns3/hns3_ethtool.c | 2 +- 3 files changed, 39 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index 3762142b2567..6a57c0d7ee88 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -1383,6 +1383,27 @@ static int hns3_fill_skb_to_desc(struct hns3_enet_ring *ring, return bd_num; } +static void hns3_tx_doorbell(struct hns3_enet_ring *ring, int num, + bool doorbell) +{ + ring->pending_buf += num; + + if (!doorbell) { + u64_stats_update_begin(&ring->syncp); + ring->stats.tx_more++; + u64_stats_update_end(&ring->syncp); + return; + } + + if (!ring->pending_buf) + return; + + wmb(); /* Commit all data before submit */ + + hnae3_queue_xmit(ring->tqp, ring->pending_buf); + ring->pending_buf = 0; +} + netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev) { struct hns3_nic_priv *priv = netdev_priv(netdev); @@ -1391,11 +1412,14 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev) int pre_ntu, next_to_use_head; struct sk_buff *frag_skb; int bd_num = 0; + bool doorbell; int ret; /* Hardware can only handle short frames above 32 bytes */ - if (skb_put_padto(skb, HNS3_MIN_TX_LEN)) + if (skb_put_padto(skb, HNS3_MIN_TX_LEN)) { + hns3_tx_doorbell(ring, 0, !netdev_xmit_more()); return NETDEV_TX_OK; + } /* Prefetch the data used later */ prefetch(skb->data); @@ -1406,6 +1430,7 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev) u64_stats_update_begin(&ring->syncp); ring->stats.tx_busy++; u64_stats_update_end(&ring->syncp); + hns3_tx_doorbell(ring, 0, true); return NETDEV_TX_BUSY; } else if (ret == -ENOMEM) { u64_stats_update_begin(&ring->syncp); @@ -1446,11 +1471,9 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev) /* Complete translate all packets */ dev_queue = netdev_get_tx_queue(netdev, ring->queue_index); - netdev_tx_sent_queue(dev_queue, skb->len); - - wmb(); /* Commit all data before submit */ - - hnae3_queue_xmit(ring->tqp, bd_num); + doorbell = __netdev_tx_sent_queue(dev_queue, skb->len, + netdev_xmit_more()); + hns3_tx_doorbell(ring, bd_num, doorbell); return NETDEV_TX_OK; @@ -1459,6 +1482,7 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev) out_err_tx_ok: dev_kfree_skb_any(skb); + hns3_tx_doorbell(ring, 0, !netdev_xmit_more()); return NETDEV_TX_OK; } @@ -1839,13 +1863,14 @@ static bool hns3_get_tx_timeo_queue_info(struct net_device *ndev) tx_ring->next_to_clean, napi->state); netdev_info(ndev, - "tx_pkts: %llu, tx_bytes: %llu, io_err_cnt: %llu, sw_err_cnt: %llu\n", + "tx_pkts: %llu, tx_bytes: %llu, io_err_cnt: %llu, sw_err_cnt: %llu, tx_pending: %d\n", tx_ring->stats.tx_pkts, tx_ring->stats.tx_bytes, - tx_ring->stats.io_err_cnt, tx_ring->stats.sw_err_cnt); + tx_ring->stats.io_err_cnt, tx_ring->stats.sw_err_cnt, + tx_ring->pending_buf); netdev_info(ndev, - "seg_pkt_cnt: %llu, tx_err_cnt: %llu, restart_queue: %llu, tx_busy: %llu\n", - tx_ring->stats.seg_pkt_cnt, tx_ring->stats.tx_err_cnt, + "seg_pkt_cnt: %llu, tx_more: %llu, restart_queue: %llu, tx_busy: %llu\n", + tx_ring->stats.seg_pkt_cnt, tx_ring->stats.tx_more, tx_ring->stats.restart_queue, tx_ring->stats.tx_busy); /* When mac received many pause frames continuous, it's unable to send @@ -4181,6 +4206,8 @@ static void hns3_clear_tx_ring(struct hns3_enet_ring *ring) hns3_free_buffer_detach(ring, ring->next_to_clean); ring_ptr_move_fw(ring, next_to_clean); } + + ring->pending_buf = 0; } static int hns3_clear_rx_ring(struct hns3_enet_ring *ring) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h index 8f7840941dd8..f40738c96cd1 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h @@ -351,7 +351,7 @@ struct ring_stats { struct { u64 tx_pkts; u64 tx_bytes; - u64 tx_err_cnt; + u64 tx_more; u64 restart_queue; u64 tx_busy; u64 tx_copy; diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c index 2622e04e8eed..97ad68b2df9a 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c @@ -32,7 +32,7 @@ static const struct hns3_stats hns3_txq_stats[] = { HNS3_TQP_STAT("seg_pkt_cnt", seg_pkt_cnt), HNS3_TQP_STAT("packets", tx_pkts), HNS3_TQP_STAT("bytes", tx_bytes), - HNS3_TQP_STAT("errors", tx_err_cnt), + HNS3_TQP_STAT("more", tx_more), HNS3_TQP_STAT("wake", restart_queue), HNS3_TQP_STAT("busy", tx_busy), HNS3_TQP_STAT("copy", tx_copy), -- GitLab