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stmmac: prefetch all dma_erx when use extend_desc 

This patch is to prefetch, in the stmmac_rx, the whole
dma_erx descriptor in case of using the extended descriptors.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2013-04-08 02:10:03 +00:00 committed by David S. Miller
parent 1bb6dea8cc
commit 9401bb5c33
1 changed files with 3 additions and 6 deletions
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9
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -2006,7 +2006,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
#endif
while (count < limit) {
int status;
struct dma_desc *p, *p_next;
struct dma_desc *p;
if (priv->extend_desc)
p = (struct dma_desc *)(priv->dma_erx + entry);
@ -2020,12 +2020,9 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
next_entry = (++priv->cur_rx) % rxsize;
if (priv->extend_desc)
p_next = (struct dma_desc *)(priv->dma_erx +
next_entry);
prefetch(priv->dma_erx + next_entry);
else
p_next = priv->dma_rx + next_entry;
prefetch(p_next);
prefetch(priv->dma_rx + next_entry);
/* read the status of the incoming frame */
status = priv->hw->desc->rx_status(&priv->dev->stats,