target/linux/generic/backport-5.10/610-v5.13-42-net-ethernet-mtk_eth_soc-remove-unnecessary-TX-queue.patch

   1 From 16ef670789b252b221700adc413497ed2f941d8a Mon Sep 17 00:00:00 2001
   2 From: Felix Fietkau <nbd@nbd.name>
   3 Date: Thu, 22 Apr 2021 22:20:59 -0700
   4 Subject: [PATCH] net: ethernet: mtk_eth_soc: remove unnecessary TX queue stops
   5
   6 When running short on descriptors, only stop the queue for the netdev that
   7 tx was attempted for. By the time something tries to send on the other
   8 netdev, the ring might have some more room already.
   9
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
  12 Signed-off-by: David S. Miller <davem@davemloft.net>
  13 ---
  14  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 15 ++-------------
  15  1 file changed, 2 insertions(+), 13 deletions(-)
  16
  17 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  18 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  19 @@ -1152,17 +1152,6 @@ static void mtk_wake_queue(struct mtk_et
  20         }
  21  }
  22
  23 -static void mtk_stop_queue(struct mtk_eth *eth)
  24 -{
  25 -       int i;
  26 -
  27 -       for (i = 0; i < MTK_MAC_COUNT; i++) {
  28 -               if (!eth->netdev[i])
  29 -                       continue;
  30 -               netif_stop_queue(eth->netdev[i]);
  31 -       }
  32 -}
  33 -
  34  static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
  35  {
  36         struct mtk_mac *mac = netdev_priv(dev);
  37 @@ -1183,7 +1172,7 @@ static netdev_tx_t mtk_start_xmit(struct
  38
  39         tx_num = mtk_cal_txd_req(skb);
  40         if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
  41 -               mtk_stop_queue(eth);
  42 +               netif_stop_queue(dev);
  43                 netif_err(eth, tx_queued, dev,
  44                           "Tx Ring full when queue awake!\n");
  45                 spin_unlock(&eth->page_lock);
  46 @@ -1209,7 +1198,7 @@ static netdev_tx_t mtk_start_xmit(struct
  47                 goto drop;
  48
  49         if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
  50 -               mtk_stop_queue(eth);
  51 +               netif_stop_queue(dev);
  52
  53         spin_unlock(&eth->page_lock);
  54