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authorLennert Buytenhek <buytenh@wantstofly.org>2008-08-23 23:45:28 +0200
committerLennert Buytenhek <buytenh@marvell.com>2008-09-05 06:33:57 +0200
commit9da7874575468ad3b126d1b9197b6ae387950bb4 (patch)
tree9fd86fe5907a59cd77ea445c7d1d9a5fb1f1f4b5 /drivers/net/mv643xx_eth.c
parent2a1867a76fc13499521af1f0dbcf08ddb3ef78ba (diff)
mv643xx_eth: get rid of modulo operations
Get rid of the modulo operations that are currently used for computing successive TX/RX descriptor ring indexes. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Diffstat (limited to 'drivers/net/mv643xx_eth.c')
-rw-r--r--drivers/net/mv643xx_eth.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 8c812c3d1b7..2f6cec4e849 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -497,8 +497,10 @@ static void rxq_refill(struct rx_queue *rxq)
skb_reserve(skb, dma_get_cache_alignment() - unaligned);
rxq->rx_desc_count++;
- rx = rxq->rx_used_desc;
- rxq->rx_used_desc = (rx + 1) % rxq->rx_ring_size;
+
+ rx = rxq->rx_used_desc++;
+ if (rxq->rx_used_desc == rxq->rx_ring_size)
+ rxq->rx_used_desc = 0;
rxq->rx_desc_area[rx].buf_ptr = dma_map_single(NULL, skb->data,
skb_size, DMA_FROM_DEVICE);
@@ -555,7 +557,9 @@ static int rxq_process(struct rx_queue *rxq, int budget)
skb = rxq->rx_skb[rxq->rx_curr_desc];
rxq->rx_skb[rxq->rx_curr_desc] = NULL;
- rxq->rx_curr_desc = (rxq->rx_curr_desc + 1) % rxq->rx_ring_size;
+ rxq->rx_curr_desc++;
+ if (rxq->rx_curr_desc == rxq->rx_ring_size)
+ rxq->rx_curr_desc = 0;
spin_unlock_irqrestore(&mp->lock, flags);
@@ -684,8 +688,9 @@ static int txq_alloc_desc_index(struct tx_queue *txq)
BUG_ON(txq->tx_desc_count >= txq->tx_ring_size);
- tx_desc_curr = txq->tx_curr_desc;
- txq->tx_curr_desc = (tx_desc_curr + 1) % txq->tx_ring_size;
+ tx_desc_curr = txq->tx_curr_desc++;
+ if (txq->tx_curr_desc == txq->tx_ring_size)
+ txq->tx_curr_desc = 0;
BUG_ON(txq->tx_curr_desc == txq->tx_used_desc);
@@ -1515,7 +1520,12 @@ static int rxq_init(struct mv643xx_eth_private *mp, int index)
rx_desc = (struct rx_desc *)rxq->rx_desc_area;
for (i = 0; i < rxq->rx_ring_size; i++) {
- int nexti = (i + 1) % rxq->rx_ring_size;
+ int nexti;
+
+ nexti = i + 1;
+ if (nexti == rxq->rx_ring_size)
+ nexti = 0;
+
rx_desc[i].next_desc_ptr = rxq->rx_desc_dma +
nexti * sizeof(struct rx_desc);
}
@@ -1617,7 +1627,11 @@ static int txq_init(struct mv643xx_eth_private *mp, int index)
tx_desc = (struct tx_desc *)txq->tx_desc_area;
for (i = 0; i < txq->tx_ring_size; i++) {
struct tx_desc *txd = tx_desc + i;
- int nexti = (i + 1) % txq->tx_ring_size;
+ int nexti;
+
+ nexti = i + 1;
+ if (nexti == txq->tx_ring_size)
+ nexti = 0;
txd->cmd_sts = 0;
txd->next_desc_ptr = txq->tx_desc_dma +
@@ -1663,7 +1677,9 @@ static void txq_reclaim(struct tx_queue *txq, int force)
desc->cmd_sts = cmd_sts & ~BUFFER_OWNED_BY_DMA;
}
- txq->tx_used_desc = (tx_index + 1) % txq->tx_ring_size;
+ txq->tx_used_desc = tx_index + 1;
+ if (txq->tx_used_desc == txq->tx_ring_size)
+ txq->tx_used_desc = 0;
txq->tx_desc_count--;
addr = desc->buf_ptr;