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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>
hifive-unleashed-5.1
Florian Fainelli 2015-05-11 15:12:41 -07:00 committed by David S. Miller
parent a2029240e5
commit b1a15e8643
1 changed files with 48 additions and 0 deletions
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48
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -456,6 +456,52 @@ static int bcm_sysport_set_wol(struct net_device *dev,
return 0;
}
static int bcm_sysport_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct bcm_sysport_priv *priv = netdev_priv(dev);
u32 reg;
reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(0));
ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
return 0;
}
static int bcm_sysport_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct bcm_sysport_priv *priv = netdev_priv(dev);
unsigned int i;
u32 reg;
/* Base system clock is 125Mhz, TDMA timeout is this reference clock
* divided by 1024, which yield roughly 8.192 us, our maximum value
* has to fit in the RING_TIMEOUT_MASK (16 bits).
*/
if (ec->tx_max_coalesced_frames > RING_INTR_THRESH_MASK ||
ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1)
return -EINVAL;
if (ec->tx_coalesce_usecs == 0 &&
ec->tx_max_coalesced_frames == 0)
return -EINVAL;
for (i = 0; i < dev->num_tx_queues; i++) {
reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(i));
reg &= ~(RING_INTR_THRESH_MASK |
RING_TIMEOUT_MASK << RING_TIMEOUT_SHIFT);
reg |= ec->tx_max_coalesced_frames;
reg |= DIV_ROUND_UP(ec->tx_coalesce_usecs * 1000, 8192) <<
RING_TIMEOUT_SHIFT;
tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(i));
}
return 0;
}
static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
{
dev_kfree_skb_any(cb->skb);
@ -1641,6 +1687,8 @@ static struct ethtool_ops bcm_sysport_ethtool_ops = {
.get_sset_count = bcm_sysport_get_sset_count,
.get_wol = bcm_sysport_get_wol,
.set_wol = bcm_sysport_set_wol,
.get_coalesce = bcm_sysport_get_coalesce,
.set_coalesce = bcm_sysport_set_coalesce,
};
static const struct net_device_ops bcm_sysport_netdev_ops = {