[PATCH net-next 08/10] net: korina: optimize tx_full condition

[Roman Yeryomin]

Signed-off-by: Roman Yeryomin <ro...@advem.lv>
---
 drivers/net/ethernet/korina.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index f606f1e01af1..9520fa1e35a2 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -124,7 +124,6 @@ struct korina_private {
        int tx_chain_tail;
        enum chain_status tx_chain_status;
        int tx_count;
-       int tx_full;
 
        int rx_irq;
        int tx_irq;
@@ -261,19 +260,10 @@ static int korina_send_packet(struct sk_buff *skb, struct 
net_device *dev)
 
        td = &lp->td_ring[lp->tx_chain_tail];
 
-       /* stop queue when full, drop pkts if queue already full */
-       if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
-               lp->tx_full = 1;
+       /* stop queue when full */
+       if (unlikely(lp->tx_count > (KORINA_NUM_TDS - 3)))
                netif_stop_queue(dev);
 
-               if (lp->tx_count > (KORINA_NUM_TDS - 2)) {
-                       dev->stats.tx_dropped++;
-                       dev_kfree_skb_any(skb);
-
-                       return NETDEV_TX_BUSY;
-               }
-       }
-
        lp->tx_count++;
        lp->tx_skb[lp->tx_chain_tail] = skb;
 
@@ -323,10 +313,8 @@ static void korina_tx(struct net_device *dev)
 
        /* Process all desc that are done */
        while (IS_DMA_FINISHED(td->control)) {
-               if (lp->tx_full == 1) {
+               if (unlikely(lp->tx_count > (KORINA_NUM_TDS - 2)))
                        netif_wake_queue(dev);
-                       lp->tx_full = 0;
-               }
 
                devcs = lp->td_ring[lp->tx_next_done].devcs;
 
@@ -696,7 +684,7 @@ static int korina_alloc_ring(struct net_device *dev)
                lp->td_ring[i].link = 0;
        }
        lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
-                       lp->tx_full = lp->tx_count = 0;
+                       lp->tx_count = 0;
        lp->tx_chain_status = desc_empty;
 
        /* Initialize the receive descriptors */
-- 
2.11.0