net: stmmac: Add support to Ethtool get/set ring parameters

This patch add support to --show-ring & --set-ring Ethtool functions:
- Adding min, max, power of two check to new ring parameter's value.
- Bring down the network interface before changing the value of ring
  parameters.
- Bring up the network interface after changing the value of ring
  parameters.

Signed-off-by: Song, Yoong Siang <yoong.siang.song@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
index 52971f5293aa..d2cdc02d9f94 100644
--- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
@@ -46,7 +46,7 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
 
 	while (len != 0) {
 		tx_q->tx_skbuff[entry] = NULL;
-		entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE);
+		entry = STMMAC_GET_ENTRY(entry, priv->dma_tx_size);
 		desc = tx_q->dma_tx + entry;
 
 		if (len > bmax) {
@@ -137,7 +137,7 @@ static void refill_desc3(void *priv_ptr, struct dma_desc *p)
 		 */
 		p->des3 = cpu_to_le32((unsigned int)(rx_q->dma_rx_phy +
 				      (((rx_q->dirty_rx) + 1) %
-				       DMA_RX_SIZE) *
+				       priv->dma_rx_size) *
 				      sizeof(struct dma_desc)));
 }
 
@@ -154,7 +154,8 @@ static void clean_desc3(void *priv_ptr, struct dma_desc *p)
 		 * to keep explicit chaining in the descriptor.
 		 */
 		p->des3 = cpu_to_le32((unsigned int)((tx_q->dma_tx_phy +
-				      ((tx_q->dirty_tx + 1) % DMA_TX_SIZE))
+				      ((tx_q->dirty_tx + 1) %
+				       priv->dma_tx_size))
 				      * sizeof(struct dma_desc)));
 }