diff options
author | Lennert Buytenhek <buytenh@wantstofly.org> | 2008-08-23 23:45:28 +0200 |
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committer | Lennert Buytenhek <buytenh@marvell.com> | 2008-09-05 06:33:57 +0200 |
commit | 9da7874575468ad3b126d1b9197b6ae387950bb4 (patch) | |
tree | 9fd86fe5907a59cd77ea445c7d1d9a5fb1f1f4b5 /drivers/net/mv643xx_eth.c | |
parent | 2a1867a76fc13499521af1f0dbcf08ddb3ef78ba (diff) | |
download | kernel_samsung_smdk4412-9da7874575468ad3b126d1b9197b6ae387950bb4.zip kernel_samsung_smdk4412-9da7874575468ad3b126d1b9197b6ae387950bb4.tar.gz kernel_samsung_smdk4412-9da7874575468ad3b126d1b9197b6ae387950bb4.tar.bz2 |
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.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c index 8c812c3..2f6cec4 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; |