mv643xx_eth: rework interrupt coalescing, and export via ethtool
This patch: - increases the precision of the receive/transmit interrupt coalescing register value computations by using 64bit temporaries; - adds functions to read the current hardware coalescing register values and convert them back to usecs; - exports the {get,set} {rx,tx} coal methods via the standard ethtool coalescing interface. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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6bdf576e4b
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3e5080344e
1 changed files with 103 additions and 30 deletions
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@ -1221,6 +1221,85 @@ static void mib_counters_timer_wrapper(unsigned long _mp)
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}
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}
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/* interrupt coalescing *****************************************************/
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/*
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* Hardware coalescing parameters are set in units of 64 t_clk
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* cycles. I.e.:
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*
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* coal_delay_in_usec = 64000000 * register_value / t_clk_rate
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*
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* register_value = coal_delay_in_usec * t_clk_rate / 64000000
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*
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* In the ->set*() methods, we round the computed register value
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* to the nearest integer.
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*/
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static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
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{
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u32 val = rdlp(mp, SDMA_CONFIG);
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u64 temp;
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if (mp->shared->extended_rx_coal_limit)
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temp = ((val & 0x02000000) >> 10) | ((val & 0x003fff80) >> 7);
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else
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temp = (val & 0x003fff00) >> 8;
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temp *= 64000000;
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do_div(temp, mp->shared->t_clk);
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return (unsigned int)temp;
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}
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static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
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{
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u64 temp;
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u32 val;
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temp = (u64)usec * mp->shared->t_clk;
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temp += 31999999;
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do_div(temp, 64000000);
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val = rdlp(mp, SDMA_CONFIG);
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if (mp->shared->extended_rx_coal_limit) {
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if (temp > 0xffff)
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temp = 0xffff;
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val &= ~0x023fff80;
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val |= (temp & 0x8000) << 10;
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val |= (temp & 0x7fff) << 7;
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} else {
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if (temp > 0x3fff)
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temp = 0x3fff;
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val &= ~0x003fff00;
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val |= (temp & 0x3fff) << 8;
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}
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wrlp(mp, SDMA_CONFIG, val);
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}
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static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
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{
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u64 temp;
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temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
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temp *= 64000000;
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do_div(temp, mp->shared->t_clk);
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return (unsigned int)temp;
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}
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static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
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{
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u64 temp;
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temp = (u64)usec * mp->shared->t_clk;
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temp += 31999999;
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do_div(temp, 64000000);
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if (temp > 0x3fff)
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temp = 0x3fff;
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wrlp(mp, TX_FIFO_URGENT_THRESHOLD, temp << 4);
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}
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/* ethtool ******************************************************************/
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/* ethtool ******************************************************************/
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struct mv643xx_eth_stats {
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struct mv643xx_eth_stats {
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char stat_string[ETH_GSTRING_LEN];
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char stat_string[ETH_GSTRING_LEN];
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@ -1384,6 +1463,28 @@ static u32 mv643xx_eth_get_link(struct net_device *dev)
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return !!netif_carrier_ok(dev);
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return !!netif_carrier_ok(dev);
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}
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}
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static int
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mv643xx_eth_get_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
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{
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struct mv643xx_eth_private *mp = netdev_priv(dev);
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ec->rx_coalesce_usecs = get_rx_coal(mp);
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ec->tx_coalesce_usecs = get_tx_coal(mp);
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return 0;
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}
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static int
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mv643xx_eth_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
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{
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struct mv643xx_eth_private *mp = netdev_priv(dev);
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set_rx_coal(mp, ec->rx_coalesce_usecs);
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set_tx_coal(mp, ec->tx_coalesce_usecs);
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return 0;
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}
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static void mv643xx_eth_get_strings(struct net_device *dev,
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static void mv643xx_eth_get_strings(struct net_device *dev,
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uint32_t stringset, uint8_t *data)
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uint32_t stringset, uint8_t *data)
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{
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{
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@ -1438,6 +1539,8 @@ static const struct ethtool_ops mv643xx_eth_ethtool_ops = {
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.get_drvinfo = mv643xx_eth_get_drvinfo,
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.get_drvinfo = mv643xx_eth_get_drvinfo,
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.nway_reset = mv643xx_eth_nway_reset,
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.nway_reset = mv643xx_eth_nway_reset,
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.get_link = mv643xx_eth_get_link,
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.get_link = mv643xx_eth_get_link,
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.get_coalesce = mv643xx_eth_get_coalesce,
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.set_coalesce = mv643xx_eth_set_coalesce,
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.set_sg = ethtool_op_set_sg,
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.set_sg = ethtool_op_set_sg,
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.get_strings = mv643xx_eth_get_strings,
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.get_strings = mv643xx_eth_get_strings,
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.get_ethtool_stats = mv643xx_eth_get_ethtool_stats,
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.get_ethtool_stats = mv643xx_eth_get_ethtool_stats,
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@ -2053,36 +2156,6 @@ static void port_start(struct mv643xx_eth_private *mp)
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}
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}
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}
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}
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static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int delay)
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{
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unsigned int coal = ((mp->shared->t_clk / 1000000) * delay) / 64;
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u32 val;
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val = rdlp(mp, SDMA_CONFIG);
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if (mp->shared->extended_rx_coal_limit) {
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if (coal > 0xffff)
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coal = 0xffff;
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val &= ~0x023fff80;
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val |= (coal & 0x8000) << 10;
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val |= (coal & 0x7fff) << 7;
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} else {
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if (coal > 0x3fff)
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coal = 0x3fff;
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val &= ~0x003fff00;
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val |= (coal & 0x3fff) << 8;
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}
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wrlp(mp, SDMA_CONFIG, val);
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}
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static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int delay)
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{
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unsigned int coal = ((mp->shared->t_clk / 1000000) * delay) / 64;
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if (coal > 0x3fff)
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coal = 0x3fff;
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wrlp(mp, TX_FIFO_URGENT_THRESHOLD, (coal & 0x3fff) << 4);
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}
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static void mv643xx_eth_recalc_skb_size(struct mv643xx_eth_private *mp)
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static void mv643xx_eth_recalc_skb_size(struct mv643xx_eth_private *mp)
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{
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{
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int skb_size;
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int skb_size;
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