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net: bcmgenet: precalculate TxCB->bd_addr

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There is 1-to-1 mapping between TxCBs and TxBDs. Precalculate TxCB->bd_addr
once in bcmgenet_init_dma() instead of doing it over and over needlessly in
bcmgenet_get_txcb().

Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petri Gynther 2015-02-23 11:00:45 -08:00 • committed by David S. Miller
parent 16c6d66788
commit 014012a491
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -920,7 +920,7 @@ static struct enet_cb *bcmgenet_get_txcb(struct bcmgenet_priv *priv,
tx_cb_ptr = ring->cbs; tx_cb_ptr = ring->cbs;
tx_cb_ptr += ring->write_ptr - ring->cb_ptr; tx_cb_ptr += ring->write_ptr - ring->cb_ptr;
tx_cb_ptr->bd_addr = priv->tx_bds + ring->write_ptr * DMA_DESC_SIZE;
/* Advancing local write pointer */ /* Advancing local write pointer */
if (ring->write_ptr == ring->end_ptr) if (ring->write_ptr == ring->end_ptr)
ring->write_ptr = ring->cb_ptr; ring->write_ptr = ring->cb_ptr;
@ -1919,6 +1919,8 @@ static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
static int bcmgenet_init_dma(struct bcmgenet_priv *priv) static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
{ {
int ret; int ret;
unsigned int i;
struct enet_cb *cb;
netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n"); netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n");
@ -1945,6 +1947,11 @@ static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
return -ENOMEM; return -ENOMEM;
} }
for (i = 0; i < priv->num_tx_bds; i++) {
cb = priv->tx_cbs + i;
cb->bd_addr = priv->tx_bds + i * DMA_DESC_SIZE;
}
/* Initialize Tx queues */ /* Initialize Tx queues */
bcmgenet_init_tx_queues(priv->dev); bcmgenet_init_tx_queues(priv->dev);