Merge branch 'net-ll_temac-Fix-and-enable-multicast-support'

Esben Haabendal says:

====================
net: ll_temac: Fix and enable multicast support

This patch series makes the necessary fixes to ll_temac driver to make
multicast work, and enables support for it.so that multicast support can

The main change is the change from mutex to spinlock of the lock used to
synchronize access to the shared indirect register access.
====================

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

3 files changed, 182 insertions, 98 deletions

diff --git a/drivers/net/ethernet/xilinx/ll_temac.h b/drivers/net/ethernet/xilinx/ll_temac.h
index 1aeda084b8f1..276292bca334 100644
--- a/drivers/net/ethernet/xilinx/ll_temac.h
+++ b/drivers/net/ethernet/xilinx/ll_temac.h
@@ -361,7 +361,7 @@ struct temac_local {
 	/* For synchronization of indirect register access.  Must be
 	 * shared mutex between interfaces in same TEMAC block.
 	 */
-	struct mutex *indirect_mutex;
+	spinlock_t *indirect_lock;
 	u32 options;			/* Current options word */
 	int last_link;
 	unsigned int temac_features;
@@ -388,8 +388,9 @@ struct temac_local {
 /* xilinx_temac.c */
 int temac_indirect_busywait(struct temac_local *lp);
 u32 temac_indirect_in32(struct temac_local *lp, int reg);
+u32 temac_indirect_in32_locked(struct temac_local *lp, int reg);
 void temac_indirect_out32(struct temac_local *lp, int reg, u32 value);
-
+void temac_indirect_out32_locked(struct temac_local *lp, int reg, u32 value);
 
 /* xilinx_temac_mdio.c */
 int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev);
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 14870d659f7d..22a52b884821 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -22,7 +22,6 @@
  *
  * TODO:
  * - Factor out locallink DMA code into separate driver
- * - Fix multicast assignment.
  * - Fix support for hardware checksumming.
  * - Testing.  Lots and lots of testing.
  *
@@ -53,6 +52,7 @@
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
+#include <linux/processor.h>
 #include <linux/platform_data/xilinx-ll-temac.h>
 
 #include "ll_temac.h"
@@ -84,51 +84,118 @@ static void _temac_iow_le(struct temac_local *lp, int offset, u32 value)
 	return iowrite32(value, lp->regs + offset);
 }
 
+static bool hard_acs_rdy(struct temac_local *lp)
+{
+	return temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK;
+}
+
+static bool hard_acs_rdy_or_timeout(struct temac_local *lp, ktime_t timeout)
+{
+	ktime_t cur = ktime_get();
+
+	return hard_acs_rdy(lp) || ktime_after(cur, timeout);
+}
+
+/* Poll for maximum 20 ms.  This is similar to the 2 jiffies @ 100 Hz
+ * that was used before, and should cover MDIO bus speed down to 3200
+ * Hz.
+ */
+#define HARD_ACS_RDY_POLL_NS (20 * NSEC_PER_MSEC)
+
+/**
+ * temac_indirect_busywait - Wait for current indirect register access
+ * to complete.
+ */
 int temac_indirect_busywait(struct temac_local *lp)
 {
-	unsigned long end = jiffies + 2;
+	ktime_t timeout = ktime_add_ns(ktime_get(), HARD_ACS_RDY_POLL_NS);
 
-	while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) {
-		if (time_before_eq(end, jiffies)) {
-			WARN_ON(1);
-			return -ETIMEDOUT;
-		}
-		usleep_range(500, 1000);
-	}
-	return 0;
+	spin_until_cond(hard_acs_rdy_or_timeout(lp, timeout));
+	if (WARN_ON(!hard_acs_rdy(lp)))
+		return -ETIMEDOUT;
+	else
+		return 0;
 }
 
 /**
- * temac_indirect_in32
- *
- * lp->indirect_mutex must be held when calling this function
+ * temac_indirect_in32 - Indirect register read access.  This function
+ * must be called without lp->indirect_lock being held.
  */
 u32 temac_indirect_in32(struct temac_local *lp, int reg)
 {
-	u32 val;
+	unsigned long flags;
+	int val;
+
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	val = temac_indirect_in32_locked(lp, reg);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
+	return val;
+}
 
-	if (temac_indirect_busywait(lp))
+/**
+ * temac_indirect_in32_locked - Indirect register read access.  This
+ * function must be called with lp->indirect_lock being held.  Use
+ * this together with spin_lock_irqsave/spin_lock_irqrestore to avoid
+ * repeated lock/unlock and to ensure uninterrupted access to indirect
+ * registers.
+ */
+u32 temac_indirect_in32_locked(struct temac_local *lp, int reg)
+{
+	/* This initial wait should normally not spin, as we always
+	 * try to wait for indirect access to complete before
+	 * releasing the indirect_lock.
+	 */
+	if (WARN_ON(temac_indirect_busywait(lp)))
 		return -ETIMEDOUT;
+	/* Initiate read from indirect register */
 	temac_iow(lp, XTE_CTL0_OFFSET, reg);
-	if (temac_indirect_busywait(lp))
+	/* Wait for indirect register access to complete.  We really
+	 * should not see timeouts, and could even end up causing
+	 * problem for following indirect access, so let's make a bit
+	 * of WARN noise.
+	 */
+	if (WARN_ON(temac_indirect_busywait(lp)))
 		return -ETIMEDOUT;
-	val = temac_ior(lp, XTE_LSW0_OFFSET);
-
-	return val;
+	/* Value is ready now */
+	return temac_ior(lp, XTE_LSW0_OFFSET);
 }
 
 /**
- * temac_indirect_out32
- *
- * lp->indirect_mutex must be held when calling this function
+ * temac_indirect_out32 - Indirect register write access.  This function
+ * must be called without lp->indirect_lock being held.
  */
 void temac_indirect_out32(struct temac_local *lp, int reg, u32 value)
 {
-	if (temac_indirect_busywait(lp))
+	unsigned long flags;
+
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_indirect_out32_locked(lp, reg, value);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
+}
+
+/**
+ * temac_indirect_out32_locked - Indirect register write access.  This
+ * function must be called with lp->indirect_lock being held.  Use
+ * this together with spin_lock_irqsave/spin_lock_irqrestore to avoid
+ * repeated lock/unlock and to ensure uninterrupted access to indirect
+ * registers.
+ */
+void temac_indirect_out32_locked(struct temac_local *lp, int reg, u32 value)
+{
+	/* As in temac_indirect_in32_locked(), we should normally not
+	 * spin here.  And if it happens, we actually end up silently
+	 * ignoring the write request.  Ouch.
+	 */
+	if (WARN_ON(temac_indirect_busywait(lp)))
 		return;
+	/* Initiate write to indirect register */
 	temac_iow(lp, XTE_LSW0_OFFSET, value);
 	temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg);
-	temac_indirect_busywait(lp);
+	/* As in temac_indirect_in32_locked(), we should not see timeouts
+	 * here.  And if it happens, we continue before the write has
+	 * completed.  Not good.
+	 */
+	WARN_ON(temac_indirect_busywait(lp));
 }
 
 /**
@@ -344,20 +411,21 @@ out:
 static void temac_do_set_mac_address(struct net_device *ndev)
 {
 	struct temac_local *lp = netdev_priv(ndev);
+	unsigned long flags;
 
 	/* set up unicast MAC address filter set its mac address */
-	mutex_lock(lp->indirect_mutex);
-	temac_indirect_out32(lp, XTE_UAW0_OFFSET,
-			     (ndev->dev_addr[0]) |
-			     (ndev->dev_addr[1] << 8) |
-			     (ndev->dev_addr[2] << 16) |
-			     (ndev->dev_addr[3] << 24));
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_indirect_out32_locked(lp, XTE_UAW0_OFFSET,
+				    (ndev->dev_addr[0]) |
+				    (ndev->dev_addr[1] << 8) |
+				    (ndev->dev_addr[2] << 16) |
+				    (ndev->dev_addr[3] << 24));
 	/* There are reserved bits in EUAW1
 	 * so don't affect them Set MAC bits [47:32] in EUAW1 */
-	temac_indirect_out32(lp, XTE_UAW1_OFFSET,
-			     (ndev->dev_addr[4] & 0x000000ff) |
-			     (ndev->dev_addr[5] << 8));
-	mutex_unlock(lp->indirect_mutex);
+	temac_indirect_out32_locked(lp, XTE_UAW1_OFFSET,
+				    (ndev->dev_addr[4] & 0x000000ff) |
+				    (ndev->dev_addr[5] << 8));
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 }
 
 static int temac_init_mac_address(struct net_device *ndev, const void *address)
@@ -383,49 +451,59 @@ static int temac_set_mac_address(struct net_device *ndev, void *p)
 static void temac_set_multicast_list(struct net_device *ndev)
 {
 	struct temac_local *lp = netdev_priv(ndev);
-	u32 multi_addr_msw, multi_addr_lsw, val;
+	u32 multi_addr_msw, multi_addr_lsw;
 	int i;
+	unsigned long flags;
+	bool promisc_mode_disabled = false;
 
-	mutex_lock(lp->indirect_mutex);
-	if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
-	    netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) {
-		/*
-		 *	We must make the kernel realise we had to move
-		 *	into promisc mode or we start all out war on
-		 *	the cable. If it was a promisc request the
-		 *	flag is already set. If not we assert it.
-		 */
-		ndev->flags |= IFF_PROMISC;
+	if (ndev->flags & (IFF_PROMISC | IFF_ALLMULTI) ||
+	    (netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM)) {
 		temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
 		dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
-	} else if (!netdev_mc_empty(ndev)) {
+		return;
+	}
+
+	spin_lock_irqsave(lp->indirect_lock, flags);
+
+	if (!netdev_mc_empty(ndev)) {
 		struct netdev_hw_addr *ha;
 
 		i = 0;
 		netdev_for_each_mc_addr(ha, ndev) {
-			if (i >= MULTICAST_CAM_TABLE_NUM)
+			if (WARN_ON(i >= MULTICAST_CAM_TABLE_NUM))
 				break;
 			multi_addr_msw = ((ha->addr[3] << 24) |
 					  (ha->addr[2] << 16) |
 					  (ha->addr[1] << 8) |
 					  (ha->addr[0]));
-			temac_indirect_out32(lp, XTE_MAW0_OFFSET,
-					     multi_addr_msw);
+			temac_indirect_out32_locked(lp, XTE_MAW0_OFFSET,
+						    multi_addr_msw);
 			multi_addr_lsw = ((ha->addr[5] << 8) |
 					  (ha->addr[4]) | (i << 16));
-			temac_indirect_out32(lp, XTE_MAW1_OFFSET,
-					     multi_addr_lsw);
+			temac_indirect_out32_locked(lp, XTE_MAW1_OFFSET,
+						    multi_addr_lsw);
 			i++;
 		}
-	} else {
-		val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
-		temac_indirect_out32(lp, XTE_AFM_OFFSET,
-				     val & ~XTE_AFM_EPPRM_MASK);
-		temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
-		temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
-		dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
 	}
-	mutex_unlock(lp->indirect_mutex);
+
+	/* Clear all or remaining/unused address table entries */
+	while (i < MULTICAST_CAM_TABLE_NUM) {
+		temac_indirect_out32_locked(lp, XTE_MAW0_OFFSET, 0);
+		temac_indirect_out32_locked(lp, XTE_MAW1_OFFSET, i << 16);
+		i++;
+	}
+
+	/* Enable address filter block if currently disabled */
+	if (temac_indirect_in32_locked(lp, XTE_AFM_OFFSET)
+	    & XTE_AFM_EPPRM_MASK) {
+		temac_indirect_out32_locked(lp, XTE_AFM_OFFSET, 0);
+		promisc_mode_disabled = true;
+	}
+
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
+
+	if (promisc_mode_disabled)
+		dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
 }
 
 static struct temac_option {
@@ -516,17 +594,19 @@ static u32 temac_setoptions(struct net_device *ndev, u32 options)
 	struct temac_local *lp = netdev_priv(ndev);
 	struct temac_option *tp = &temac_options[0];
 	int reg;
+	unsigned long flags;
 
-	mutex_lock(lp->indirect_mutex);
+	spin_lock_irqsave(lp->indirect_lock, flags);
 	while (tp->opt) {
-		reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
-		if (options & tp->opt)
+		reg = temac_indirect_in32_locked(lp, tp->reg) & ~tp->m_or;
+		if (options & tp->opt) {
 			reg |= tp->m_or;
-		temac_indirect_out32(lp, tp->reg, reg);
+			temac_indirect_out32_locked(lp, tp->reg, reg);
+		}
 		tp++;
 	}
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 	lp->options |= options;
-	mutex_unlock(lp->indirect_mutex);
 
 	return 0;
 }
@@ -537,6 +617,7 @@ static void temac_device_reset(struct net_device *ndev)
 	struct temac_local *lp = netdev_priv(ndev);
 	u32 timeout;
 	u32 val;
+	unsigned long flags;
 
 	/* Perform a software reset */
 
@@ -545,7 +626,6 @@ static void temac_device_reset(struct net_device *ndev)
 
 	dev_dbg(&ndev->dev, "%s()\n", __func__);
 
-	mutex_lock(lp->indirect_mutex);
 	/* Reset the receiver and wait for it to finish reset */
 	temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
 	timeout = 1000;
@@ -571,8 +651,11 @@ static void temac_device_reset(struct net_device *ndev)
 	}
 
 	/* Disable the receiver */
-	val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
-	temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	val = temac_indirect_in32_locked(lp, XTE_RXC1_OFFSET);
+	temac_indirect_out32_locked(lp, XTE_RXC1_OFFSET,
+				    val & ~XTE_RXC1_RXEN_MASK);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 
 	/* Reset Local Link (DMA) */
 	lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
@@ -592,12 +675,12 @@ static void temac_device_reset(struct net_device *ndev)
 				"temac_device_reset descriptor allocation failed\n");
 	}
 
-	temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
-	temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
-	temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
-	temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
-
-	mutex_unlock(lp->indirect_mutex);
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_indirect_out32_locked(lp, XTE_RXC0_OFFSET, 0);
+	temac_indirect_out32_locked(lp, XTE_RXC1_OFFSET, 0);
+	temac_indirect_out32_locked(lp, XTE_TXC_OFFSET, 0);
+	temac_indirect_out32_locked(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 
 	/* Sync default options with HW
 	 * but leave receiver and transmitter disabled.  */
@@ -621,13 +704,14 @@ static void temac_adjust_link(struct net_device *ndev)
 	struct phy_device *phy = ndev->phydev;
 	u32 mii_speed;
 	int link_state;
+	unsigned long flags;
 
 	/* hash together the state values to decide if something has changed */
 	link_state = phy->speed | (phy->duplex << 1) | phy->link;
 
-	mutex_lock(lp->indirect_mutex);
 	if (lp->last_link != link_state) {
-		mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
+		spin_lock_irqsave(lp->indirect_lock, flags);
+		mii_speed = temac_indirect_in32_locked(lp, XTE_EMCFG_OFFSET);
 		mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
 
 		switch (phy->speed) {
@@ -637,11 +721,12 @@ static void temac_adjust_link(struct net_device *ndev)
 		}
 
 		/* Write new speed setting out to TEMAC */
-		temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
+		temac_indirect_out32_locked(lp, XTE_EMCFG_OFFSET, mii_speed);
+		spin_unlock_irqrestore(lp->indirect_lock, flags);
+
 		lp->last_link = link_state;
 		phy_print_status(phy);
 	}
-	mutex_unlock(lp->indirect_mutex);
 }
 
 #ifdef CONFIG_64BIT
@@ -1011,6 +1096,7 @@ static const struct net_device_ops temac_netdev_ops = {
 	.ndo_open = temac_open,
 	.ndo_stop = temac_stop,
 	.ndo_start_xmit = temac_start_xmit,
+	.ndo_set_rx_mode = temac_set_multicast_list,
 	.ndo_set_mac_address = temac_set_mac_address,
 	.ndo_validate_addr = eth_validate_addr,
 	.ndo_do_ioctl = temac_ioctl,
@@ -1076,7 +1162,6 @@ static int temac_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, ndev);
 	SET_NETDEV_DEV(ndev, &pdev->dev);
-	ndev->flags &= ~IFF_MULTICAST;  /* clear multicast */
 	ndev->features = NETIF_F_SG;
 	ndev->netdev_ops = &temac_netdev_ops;
 	ndev->ethtool_ops = &temac_ethtool_ops;
@@ -1103,17 +1188,17 @@ static int temac_probe(struct platform_device *pdev)
 
 	/* Setup mutex for synchronization of indirect register access */
 	if (pdata) {
-		if (!pdata->indirect_mutex) {
+		if (!pdata->indirect_lock) {
 			dev_err(&pdev->dev,
-				"indirect_mutex missing in platform_data\n");
+				"indirect_lock missing in platform_data\n");
 			return -EINVAL;
 		}
-		lp->indirect_mutex = pdata->indirect_mutex;
+		lp->indirect_lock = pdata->indirect_lock;
 	} else {
-		lp->indirect_mutex = devm_kmalloc(&pdev->dev,
-						  sizeof(*lp->indirect_mutex),
-						  GFP_KERNEL);
-		mutex_init(lp->indirect_mutex);
+		lp->indirect_lock = devm_kmalloc(&pdev->dev,
+						 sizeof(*lp->indirect_lock),
+						 GFP_KERNEL);
+		spin_lock_init(lp->indirect_lock);
 	}
 
 	/* map device registers */
diff --git a/drivers/net/ethernet/xilinx/ll_temac_mdio.c b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
index a4667326f745..6fd2dea4e60f 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_mdio.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_mdio.c
@@ -25,14 +25,15 @@ static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 {
 	struct temac_local *lp = bus->priv;
 	u32 rc;
+	unsigned long flags;
 
 	/* Write the PHY address to the MIIM Access Initiator register.
 	 * When the transfer completes, the PHY register value will appear
 	 * in the LSW0 register */
-	mutex_lock(lp->indirect_mutex);
+	spin_lock_irqsave(lp->indirect_lock, flags);
 	temac_iow(lp, XTE_LSW0_OFFSET, (phy_id << 5) | reg);
-	rc = temac_indirect_in32(lp, XTE_MIIMAI_OFFSET);
-	mutex_unlock(lp->indirect_mutex);
+	rc = temac_indirect_in32_locked(lp, XTE_MIIMAI_OFFSET);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 
 	dev_dbg(lp->dev, "temac_mdio_read(phy_id=%i, reg=%x) == %x\n",
 		phy_id, reg, rc);
@@ -43,6 +44,7 @@ static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
 {
 	struct temac_local *lp = bus->priv;
+	unsigned long flags;
 
 	dev_dbg(lp->dev, "temac_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
 		phy_id, reg, val);
@@ -50,10 +52,10 @@ static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
 	/* First write the desired value into the write data register
 	 * and then write the address into the access initiator register
 	 */
-	mutex_lock(lp->indirect_mutex);
-	temac_indirect_out32(lp, XTE_MGTDR_OFFSET, val);
-	temac_indirect_out32(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg);
-	mutex_unlock(lp->indirect_mutex);
+	spin_lock_irqsave(lp->indirect_lock, flags);
+	temac_indirect_out32_locked(lp, XTE_MGTDR_OFFSET, val);
+	temac_indirect_out32_locked(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg);
+	spin_unlock_irqrestore(lp->indirect_lock, flags);
 
 	return 0;
 }
@@ -87,9 +89,7 @@ int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev)
 
 	/* Enable the MDIO bus by asserting the enable bit and writing
 	 * in the clock config */
-	mutex_lock(lp->indirect_mutex);
 	temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div);
-	mutex_unlock(lp->indirect_mutex);
 
 	bus = devm_mdiobus_alloc(&pdev->dev);
 	if (!bus)
@@ -116,10 +116,8 @@ int temac_mdio_setup(struct temac_local *lp, struct platform_device *pdev)
 	if (rc)
 		return rc;
 
-	mutex_lock(lp->indirect_mutex);
 	dev_dbg(lp->dev, "MDIO bus registered;  MC:%x\n",
 		temac_indirect_in32(lp, XTE_MC_OFFSET));
-	mutex_unlock(lp->indirect_mutex);
 	return 0;
 }