net: bcmgenet: add support for xmit_more

Delay the update of the TDMA producer index unless this is the last SKB
in a batch, or the queue is already stopped. Move the check for whether
the queue should be stopped before the xmit_more check to avoid locking
the transmit queue in case there was a SKB submitted which has xmit_more
set.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 53c916ea06a2..e74ae628bbb9 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1316,12 +1316,13 @@ static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
         ring->prod_index += nr_frags + 1;
         ring->prod_index &= DMA_P_INDEX_MASK;
 
-        bcmgenet_tdma_ring_writel(priv, ring->index,
-                                  ring->prod_index, TDMA_PROD_INDEX);
-
         if (ring->free_bds <= (MAX_SKB_FRAGS + 1))
                 netif_tx_stop_queue(txq);
 
+        if (!skb->xmit_more || netif_xmit_stopped(txq))
+                /* Packets are ready, update producer index */
+                bcmgenet_tdma_ring_writel(priv, ring->index,
+                                          ring->prod_index, TDMA_PROD_INDEX);
 out:
         spin_unlock_irqrestore(&ring->lock, flags);