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stmmac: get/set coalesce parameters via ethtool

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This patch is to get/set the tx/rx coalesce parameters
via ethtool interface.

Tests have been done on several platform with different GMAC chips w/o and w/
RX watchdog feature.

V2: reject coalesce settings that are not supported.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2012-11-25 23:10:44 +00:00 committed by David S. Miller
parent 62a2ab935c
commit 48f44da454
1 changed files with 83 additions and 0 deletions
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83
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
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@ -524,6 +524,87 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
return phy_ethtool_set_eee(priv->phydev, edata);
}
static u32 stmmac_usec2riwt(u32 usec, struct stmmac_priv *priv)
{
unsigned long clk = clk_get_rate(priv->stmmac_clk);
if (!clk)
return 0;
return (usec * (clk / 1000000)) / 256;
}
static u32 stmmac_riwt2usec(u32 riwt, struct stmmac_priv *priv)
{
unsigned long clk = clk_get_rate(priv->stmmac_clk);
if (!clk)
return 0;
return (riwt * 256) / (clk / 1000000);
}
static int stmmac_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct stmmac_priv *priv = netdev_priv(dev);
ec->tx_coalesce_usecs = priv->tx_coal_timer;
ec->tx_max_coalesced_frames = priv->tx_coal_frames;
if (priv->use_riwt)
ec->rx_coalesce_usecs = stmmac_riwt2usec(priv->rx_riwt, priv);
return 0;
}
static int stmmac_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct stmmac_priv *priv = netdev_priv(dev);
unsigned int rx_riwt;
/* Check not supported parameters */
if ((ec->rx_max_coalesced_frames) || (ec->rx_coalesce_usecs_irq) ||
(ec->rx_max_coalesced_frames_irq) || (ec->tx_coalesce_usecs_irq) ||
(ec->use_adaptive_rx_coalesce) || (ec->use_adaptive_tx_coalesce) ||
(ec->pkt_rate_low) || (ec->rx_coalesce_usecs_low) ||
(ec->rx_max_coalesced_frames_low) || (ec->tx_coalesce_usecs_high) ||
(ec->tx_max_coalesced_frames_low) || (ec->pkt_rate_high) ||
(ec->tx_coalesce_usecs_low) || (ec->rx_coalesce_usecs_high) ||
(ec->rx_max_coalesced_frames_high) ||
(ec->tx_max_coalesced_frames_irq) ||
(ec->stats_block_coalesce_usecs) ||
(ec->tx_max_coalesced_frames_high) || (ec->rate_sample_interval))
return -EOPNOTSUPP;
if (ec->rx_coalesce_usecs == 0)
return -EINVAL;
if ((ec->tx_coalesce_usecs == 0) &&
(ec->tx_max_coalesced_frames == 0))
return -EINVAL;
if ((ec->tx_coalesce_usecs > STMMAC_COAL_TX_TIMER) ||
(ec->tx_max_coalesced_frames > STMMAC_TX_MAX_FRAMES))
return -EINVAL;
rx_riwt = stmmac_usec2riwt(ec->rx_coalesce_usecs, priv);
if ((rx_riwt > MAX_DMA_RIWT) || (rx_riwt < MIN_DMA_RIWT))
return -EINVAL;
else if (!priv->use_riwt)
return -EOPNOTSUPP;
/* Only copy relevant parameters, ignore all others. */
priv->tx_coal_frames = ec->tx_max_coalesced_frames;
priv->tx_coal_timer = ec->tx_coalesce_usecs;
priv->rx_riwt = rx_riwt;
priv->hw->dma->rx_watchdog(priv->ioaddr, priv->rx_riwt);
return 0;
}
static const struct ethtool_ops stmmac_ethtool_ops = {
.begin = stmmac_check_if_running,
.get_drvinfo = stmmac_ethtool_getdrvinfo,
@ -544,6 +625,8 @@ static const struct ethtool_ops stmmac_ethtool_ops = {
.set_eee = stmmac_ethtool_op_set_eee,
.get_sset_count = stmmac_get_sset_count,
.get_ts_info = ethtool_op_get_ts_info,
.get_coalesce = stmmac_get_coalesce,
.set_coalesce = stmmac_set_coalesce,
};
void stmmac_set_ethtool_ops(struct net_device *netdev)