Merge branch 'systemport-irq-coalesce'

Florian Fainelli says:

====================
net: systemport: interrupt coalescing support

This patch series adds support for RX & TX interrupt coalescing in the
systemport driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcmsysport.c

@@ -456,6 +456,67 @@ 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;
+
+	reg = rdma_readl(priv, RDMA_MBDONE_INTR);
+
+	ec->rx_coalesce_usecs = (reg >> RDMA_TIMEOUT_SHIFT) * 8192 / 1000;
+	ec->rx_max_coalesced_frames = reg & RDMA_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, DMA 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 ||
+	    ec->rx_max_coalesced_frames > RDMA_INTR_THRESH_MASK ||
+	    ec->rx_coalesce_usecs > (RDMA_TIMEOUT_MASK * 8) + 1)
+		return -EINVAL;
+
+	if ((ec->tx_coalesce_usecs == 0 && ec->tx_max_coalesced_frames == 0) ||
+	    (ec->rx_coalesce_usecs == 0 && ec->rx_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));
+	}
+
+	reg = rdma_readl(priv, RDMA_MBDONE_INTR);
+	reg &= ~(RDMA_INTR_THRESH_MASK |
+		 RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
+	reg |= ec->rx_max_coalesced_frames;
+	reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192) <<
+			    RDMA_TIMEOUT_SHIFT;
+	rdma_writel(priv, reg, RDMA_MBDONE_INTR);
+
+	return 0;
+}
+
 static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
 {
 	dev_kfree_skb_any(cb->skb);
@@ -1641,6 +1702,8 @@ 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 = {

drivers/net/ethernet/broadcom/bcmsysport.h

@@ -292,7 +292,7 @@ struct bcm_rsb {
 #define RDMA_END_ADDR_LO		0x102c
 
 #define RDMA_MBDONE_INTR		0x1030
-#define  RDMA_INTR_THRESH_MASK		0xff
+#define  RDMA_INTR_THRESH_MASK		0x1ff
 #define  RDMA_TIMEOUT_SHIFT		16
 #define  RDMA_TIMEOUT_MASK		0xffff