net: systemport: Add support for WAKE_FILTER

The SYSTEMPORT MAC allows up to 8 filters to be programmed to wake-up
from LAN. Verify that we have up to 8 filters and program them to the
appropriate RXCHK entries to be matched (along with their masks).

We need to update the entry and exit to Wake-on-LAN mode to keep the
RXCHK engine running to match during suspend, but this is otherwise
fairly similar to Magic Packet detection.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcmsysport.c

@@ -521,7 +521,7 @@ static void bcm_sysport_get_wol(struct net_device *dev,
 	struct bcm_sysport_priv *priv = netdev_priv(dev);
 	u32 reg;
 
-	wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE;
+	wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
 	wol->wolopts = priv->wolopts;
 
 	if (!(priv->wolopts & WAKE_MAGICSECURE))
@@ -539,7 +539,7 @@ static int bcm_sysport_set_wol(struct net_device *dev,
 {
 	struct bcm_sysport_priv *priv = netdev_priv(dev);
 	struct device *kdev = &priv->pdev->dev;
-	u32 supported = WAKE_MAGIC | WAKE_MAGICSECURE;
+	u32 supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
 
 	if (!device_can_wakeup(kdev))
 		return -ENOTSUPP;
@@ -1043,7 +1043,7 @@ static int bcm_sysport_poll(struct napi_struct *napi, int budget)
 
 static void mpd_enable_set(struct bcm_sysport_priv *priv, bool enable)
 {
-	u32 reg;
+	u32 reg, bit;
 
 	reg = umac_readl(priv, UMAC_MPD_CTRL);
 	if (enable)
@@ -1051,12 +1051,32 @@ static void mpd_enable_set(struct bcm_sysport_priv *priv, bool enable)
 	else
 		reg &= ~MPD_EN;
 	umac_writel(priv, reg, UMAC_MPD_CTRL);
+
+	if (priv->is_lite)
+		bit = RBUF_ACPI_EN_LITE;
+	else
+		bit = RBUF_ACPI_EN;
+
+	reg = rbuf_readl(priv, RBUF_CONTROL);
+	if (enable)
+		reg |= bit;
+	else
+		reg &= ~bit;
+	rbuf_writel(priv, reg, RBUF_CONTROL);
 }
 
 static void bcm_sysport_resume_from_wol(struct bcm_sysport_priv *priv)
 {
+	u32 reg;
+
 	/* Stop monitoring MPD interrupt */
-	intrl2_0_mask_set(priv, INTRL2_0_MPD);
+	intrl2_0_mask_set(priv, INTRL2_0_MPD | INTRL2_0_BRCM_MATCH_TAG);
+
+	/* Disable RXCHK, active filters and Broadcom tag matching */
+	reg = rxchk_readl(priv, RXCHK_CONTROL);
+	reg &= ~(RXCHK_BRCM_TAG_MATCH_MASK <<
+		 RXCHK_BRCM_TAG_MATCH_SHIFT | RXCHK_EN | RXCHK_BRCM_TAG_EN);
+	rxchk_writel(priv, reg, RXCHK_CONTROL);
 
 	/* Clear the MagicPacket detection logic */
 	mpd_enable_set(priv, false);
@@ -1085,6 +1105,7 @@ static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
 	struct bcm_sysport_priv *priv = netdev_priv(dev);
 	struct bcm_sysport_tx_ring *txr;
 	unsigned int ring, ring_bit;
+	u32 reg;
 
 	priv->irq0_stat = intrl2_0_readl(priv, INTRL2_CPU_STATUS) &
 			  ~intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
@@ -1111,7 +1132,14 @@ static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
 		bcm_sysport_tx_reclaim_all(priv);
 
 	if (priv->irq0_stat & INTRL2_0_MPD)
-		netdev_info(priv->netdev, "Wake-on-LAN interrupt!\n");
+		netdev_info(priv->netdev, "Wake-on-LAN (MPD) interrupt!\n");
+
+	if (priv->irq0_stat & INTRL2_0_BRCM_MATCH_TAG) {
+		reg = rxchk_readl(priv, RXCHK_BRCM_TAG_MATCH_STATUS) &
+				  RXCHK_BRCM_TAG_MATCH_MASK;
+		netdev_info(priv->netdev,
+			    "Wake-on-LAN (filters 0x%02x) interrupt!\n", reg);
+	}
 
 	if (!priv->is_lite)
 		goto out;
@@ -2096,6 +2124,132 @@ static int bcm_sysport_stop(struct net_device *dev)
 	return 0;
 }
 
+static int bcm_sysport_rule_find(struct bcm_sysport_priv *priv,
+				 u64 location)
+{
+	unsigned int index;
+	u32 reg;
+
+	for_each_set_bit(index, priv->filters, RXCHK_BRCM_TAG_MAX) {
+		reg = rxchk_readl(priv, RXCHK_BRCM_TAG(index));
+		reg >>= RXCHK_BRCM_TAG_CID_SHIFT;
+		reg &= RXCHK_BRCM_TAG_CID_MASK;
+		if (reg == location)
+			return index;
+	}
+
+	return -EINVAL;
+}
+
+static int bcm_sysport_rule_get(struct bcm_sysport_priv *priv,
+				struct ethtool_rxnfc *nfc)
+{
+	int index;
+
+	/* This is not a rule that we know about */
+	index = bcm_sysport_rule_find(priv, nfc->fs.location);
+	if (index < 0)
+		return -EOPNOTSUPP;
+
+	nfc->fs.ring_cookie = RX_CLS_FLOW_WAKE;
+
+	return 0;
+}
+
+static int bcm_sysport_rule_set(struct bcm_sysport_priv *priv,
+				struct ethtool_rxnfc *nfc)
+{
+	unsigned int index;
+	u32 reg;
+
+	/* We cannot match locations greater than what the classification ID
+	 * permits (256 entries)
+	 */
+	if (nfc->fs.location > RXCHK_BRCM_TAG_CID_MASK)
+		return -E2BIG;
+
+	/* We cannot support flows that are not destined for a wake-up */
+	if (nfc->fs.ring_cookie != RX_CLS_FLOW_WAKE)
+		return -EOPNOTSUPP;
+
+	/* All filters are already in use, we cannot match more rules */
+	if (bitmap_weight(priv->filters, RXCHK_BRCM_TAG_MAX) ==
+	    RXCHK_BRCM_TAG_MAX)
+		return -ENOSPC;
+
+	index = find_first_zero_bit(priv->filters, RXCHK_BRCM_TAG_MAX);
+	if (index > RXCHK_BRCM_TAG_MAX)
+		return -ENOSPC;
+
+	/* Location is the classification ID, and index is the position
+	 * within one of our 8 possible filters to be programmed
+	 */
+	reg = rxchk_readl(priv, RXCHK_BRCM_TAG(index));
+	reg &= ~(RXCHK_BRCM_TAG_CID_MASK << RXCHK_BRCM_TAG_CID_SHIFT);
+	reg |= nfc->fs.location << RXCHK_BRCM_TAG_CID_SHIFT;
+	rxchk_writel(priv, reg, RXCHK_BRCM_TAG(index));
+	rxchk_writel(priv, 0xff00ffff, RXCHK_BRCM_TAG_MASK(index));
+
+	set_bit(index, priv->filters);
+
+	return 0;
+}
+
+static int bcm_sysport_rule_del(struct bcm_sysport_priv *priv,
+				u64 location)
+{
+	int index;
+
+	/* This is not a rule that we know about */
+	index = bcm_sysport_rule_find(priv, location);
+	if (index < 0)
+		return -EOPNOTSUPP;
+
+	/* No need to disable this filter if it was enabled, this will
+	 * be taken care of during suspend time by bcm_sysport_suspend_to_wol
+	 */
+	clear_bit(index, priv->filters);
+
+	return 0;
+}
+
+static int bcm_sysport_get_rxnfc(struct net_device *dev,
+				 struct ethtool_rxnfc *nfc, u32 *rule_locs)
+{
+	struct bcm_sysport_priv *priv = netdev_priv(dev);
+	int ret = -EOPNOTSUPP;
+
+	switch (nfc->cmd) {
+	case ETHTOOL_GRXCLSRULE:
+		ret = bcm_sysport_rule_get(priv, nfc);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int bcm_sysport_set_rxnfc(struct net_device *dev,
+				 struct ethtool_rxnfc *nfc)
+{
+	struct bcm_sysport_priv *priv = netdev_priv(dev);
+	int ret = -EOPNOTSUPP;
+
+	switch (nfc->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		ret = bcm_sysport_rule_set(priv, nfc);
+		break;
+	case ETHTOOL_SRXCLSRLDEL:
+		ret = bcm_sysport_rule_del(priv, nfc->fs.location);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
 static const struct ethtool_ops bcm_sysport_ethtool_ops = {
 	.get_drvinfo		= bcm_sysport_get_drvinfo,
 	.get_msglevel		= bcm_sysport_get_msglvl,
@@ -2110,6 +2264,8 @@ static const struct ethtool_ops bcm_sysport_ethtool_ops = {
 	.set_coalesce		= bcm_sysport_set_coalesce,
 	.get_link_ksettings     = phy_ethtool_get_link_ksettings,
 	.set_link_ksettings     = phy_ethtool_set_link_ksettings,
+	.get_rxnfc		= bcm_sysport_get_rxnfc,
+	.set_rxnfc		= bcm_sysport_set_rxnfc,
 };
 
 static u16 bcm_sysport_select_queue(struct net_device *dev, struct sk_buff *skb,
@@ -2434,16 +2590,39 @@ static int bcm_sysport_suspend_to_wol(struct bcm_sysport_priv *priv)
 {
 	struct net_device *ndev = priv->netdev;
 	unsigned int timeout = 1000;
+	unsigned int index, i = 0;
 	u32 reg;
 
 	/* Password has already been programmed */
 	reg = umac_readl(priv, UMAC_MPD_CTRL);
-	reg |= MPD_EN;
+	if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE))
+		reg |= MPD_EN;
 	reg &= ~PSW_EN;
 	if (priv->wolopts & WAKE_MAGICSECURE)
 		reg |= PSW_EN;
 	umac_writel(priv, reg, UMAC_MPD_CTRL);
 
+	if (priv->wolopts & WAKE_FILTER) {
+		/* Turn on ACPI matching to steal packets from RBUF */
+		reg = rbuf_readl(priv, RBUF_CONTROL);
+		if (priv->is_lite)
+			reg |= RBUF_ACPI_EN_LITE;
+		else
+			reg |= RBUF_ACPI_EN;
+		rbuf_writel(priv, reg, RBUF_CONTROL);
+
+		/* Enable RXCHK, active filters and Broadcom tag matching */
+		reg = rxchk_readl(priv, RXCHK_CONTROL);
+		reg &= ~(RXCHK_BRCM_TAG_MATCH_MASK <<
+			 RXCHK_BRCM_TAG_MATCH_SHIFT);
+		for_each_set_bit(index, priv->filters, RXCHK_BRCM_TAG_MAX) {
+			reg |= BIT(RXCHK_BRCM_TAG_MATCH_SHIFT + i);
+			i++;
+		}
+		reg |= RXCHK_EN | RXCHK_BRCM_TAG_EN;
+		rxchk_writel(priv, reg, RXCHK_CONTROL);
+	}
+
 	/* Make sure RBUF entered WoL mode as result */
 	do {
 		reg = rbuf_readl(priv, RBUF_STATUS);
@@ -2464,7 +2643,7 @@ static int bcm_sysport_suspend_to_wol(struct bcm_sysport_priv *priv)
 	umac_enable_set(priv, CMD_RX_EN, 1);
 
 	/* Enable the interrupt wake-up source */
-	intrl2_0_mask_clear(priv, INTRL2_0_MPD);
+	intrl2_0_mask_clear(priv, INTRL2_0_MPD | INTRL2_0_BRCM_MATCH_TAG);
 
 	netif_dbg(priv, wol, ndev, "entered WOL mode\n");
 

drivers/net/ethernet/broadcom/bcmsysport.h

@@ -11,6 +11,7 @@
 #ifndef __BCM_SYSPORT_H
 #define __BCM_SYSPORT_H
 
+#include <linux/bitmap.h>
 #include <linux/if_vlan.h>
 #include <linux/net_dim.h>
 
@@ -155,14 +156,18 @@ struct bcm_rsb {
 #define  RXCHK_PARSE_AUTH		(1 << 22)
 
 #define RXCHK_BRCM_TAG0			0x04
-#define RXCHK_BRCM_TAG(i)		((i) * RXCHK_BRCM_TAG0)
+#define RXCHK_BRCM_TAG(i)		((i) * 0x4 + RXCHK_BRCM_TAG0)
 #define RXCHK_BRCM_TAG0_MASK		0x24
-#define RXCHK_BRCM_TAG_MASK(i)		((i) * RXCHK_BRCM_TAG0_MASK)
+#define RXCHK_BRCM_TAG_MASK(i)		((i) * 0x4 + RXCHK_BRCM_TAG0_MASK)
 #define RXCHK_BRCM_TAG_MATCH_STATUS	0x44
 #define RXCHK_ETHERTYPE			0x48
 #define RXCHK_BAD_CSUM_CNTR		0x4C
 #define RXCHK_OTHER_DISC_CNTR		0x50
 
+#define RXCHK_BRCM_TAG_MAX		8
+#define RXCHK_BRCM_TAG_CID_SHIFT	16
+#define RXCHK_BRCM_TAG_CID_MASK		0xff
+
 /* TXCHCK offsets and defines */
 #define SYS_PORT_TXCHK_OFFSET		0x380
 #define TXCHK_PKT_RDY_THRESH		0x00
@@ -185,6 +190,7 @@ struct bcm_rsb {
 #define  RBUF_RSB_SWAP0			(1 << 22)
 #define  RBUF_RSB_SWAP1			(1 << 23)
 #define  RBUF_ACPI_EN			(1 << 23)
+#define  RBUF_ACPI_EN_LITE		(1 << 24)
 
 #define RBUF_PKT_RDY_THRESH		0x04
 
@@ -777,6 +783,7 @@ struct bcm_sysport_priv {
 
 	/* Ethtool */
 	u32			msg_enable;
+	DECLARE_BITMAP(filters, RXCHK_BRCM_TAG_MAX);
 
 	struct bcm_sysport_stats64	stats64;