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net: systemport: Implement TX coalescing control knobs
Add the ability to configure both 'tx-frames' which controls how many frames are doing to trigger a single interrupt and 'tx-usecs' which dictates how long to wait before an interrupt should be services. Since our timer resolution is close to 8.192 us, we round up to the nearest value the 'tx-usecs' timeout value. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 48 additions and 0 deletions
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@ -456,6 +456,52 @@ static int bcm_sysport_set_wol(struct net_device *dev,
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return 0;
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}
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static int bcm_sysport_get_coalesce(struct net_device *dev,
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struct ethtool_coalesce *ec)
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{
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struct bcm_sysport_priv *priv = netdev_priv(dev);
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u32 reg;
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reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(0));
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ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
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ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
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return 0;
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}
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static int bcm_sysport_set_coalesce(struct net_device *dev,
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struct ethtool_coalesce *ec)
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{
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struct bcm_sysport_priv *priv = netdev_priv(dev);
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unsigned int i;
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u32 reg;
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/* Base system clock is 125Mhz, TDMA timeout is this reference clock
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* divided by 1024, which yield roughly 8.192 us, our maximum value
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* has to fit in the RING_TIMEOUT_MASK (16 bits).
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*/
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if (ec->tx_max_coalesced_frames > RING_INTR_THRESH_MASK ||
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ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1)
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return -EINVAL;
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if (ec->tx_coalesce_usecs == 0 &&
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ec->tx_max_coalesced_frames == 0)
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return -EINVAL;
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for (i = 0; i < dev->num_tx_queues; i++) {
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reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(i));
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reg &= ~(RING_INTR_THRESH_MASK |
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RING_TIMEOUT_MASK << RING_TIMEOUT_SHIFT);
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reg |= ec->tx_max_coalesced_frames;
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reg |= DIV_ROUND_UP(ec->tx_coalesce_usecs * 1000, 8192) <<
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RING_TIMEOUT_SHIFT;
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tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(i));
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}
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return 0;
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}
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static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
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{
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dev_kfree_skb_any(cb->skb);
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@ -1641,6 +1687,8 @@ static struct ethtool_ops bcm_sysport_ethtool_ops = {
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.get_sset_count = bcm_sysport_get_sset_count,
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.get_wol = bcm_sysport_get_wol,
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.set_wol = bcm_sysport_set_wol,
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.get_coalesce = bcm_sysport_get_coalesce,
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.set_coalesce = bcm_sysport_set_coalesce,
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};
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static const struct net_device_ops bcm_sysport_netdev_ops = {
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