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Merge branch 'bcmgenet_xmit_more'

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Florian Fainelli says:

====================
net: bcmgenet: xmit_more support

This patch series adds xmit_more support to the GENET driver by allowing
the deferal of the producer index write to the TDMA engine.

Changes in v2:

- move the netif_tx_stop_queue check *before* updating the producer index
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-03-13 15:52:38 -04:00
commit 2801be4a0e
1 changed files with 8 additions and 15 deletions
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23
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -1130,11 +1130,6 @@ static int bcmgenet_xmit_single(struct net_device *dev,
dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping, length_status);
/* Decrement total BD count and advance our write pointer */
ring->free_bds -= 1;
ring->prod_index += 1;
ring->prod_index &= DMA_P_INDEX_MASK;
return 0;
}
@ -1173,11 +1168,6 @@ static int bcmgenet_xmit_frag(struct net_device *dev,
(frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
(priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));
ring->free_bds -= 1;
ring->prod_index += 1;
ring->prod_index &= DMA_P_INDEX_MASK;
return 0;
}
@ -1321,15 +1311,18 @@ static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
skb_tx_timestamp(skb);
/* we kept a software copy of how much we should advance the TDMA
* producer index, now write it down to the hardware
*/
bcmgenet_tdma_ring_writel(priv, ring->index,
ring->prod_index, TDMA_PROD_INDEX);
/* Decrement total BD count and advance our write pointer */
ring->free_bds -= nr_frags + 1;
ring->prod_index += nr_frags + 1;
ring->prod_index &= DMA_P_INDEX_MASK;
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);