net: stmmac: Correct set_filter for multicast and unicast cases

This patch removes the check for the number of mulitcast addresses
when using hash based filtering since it's not necessary. If the number
of multicast addresses in the list exceeds the number of multicast hash
bins, the bins will "fold" over into one of the bins configured and
enabled for the particular component instance.

The default number of maximum unicast addresses was changed from 32 to 1
since this number is not dependent on the component revision. The maximum
number of multicast and unicast addresses is dependent on the configuration
of the Synopsys EMAC configured by the SOC architect at the time the
features were selected and configured for a particular component. Sadly,
Synopsys does not provide a way to query the precise number supported
by a particular component, so we must fall back on a devicetree entry.
This configuration could vary from vendor to vendor (such as STMicro,
Altera, etc).

The multicast bins are set for every possible filtering case (including
no entries) - previously the bits were set only if multicast filter entries
were present.

Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -381,7 +381,7 @@ struct stmmac_ops {
 	int (*host_irq_status)(struct mac_device_info *hw,
 			       struct stmmac_extra_stats *x);
 	/* Multicast filter setting */
-	void (*set_filter)(struct net_device *dev, int id);
+	void (*set_filter)(struct net_device *dev);
 	/* Flow control setting */
 	void (*flow_ctrl)(struct mac_device_info *hw, unsigned int duplex,
 			  unsigned int fc, unsigned int pause_time);

drivers/net/ethernet/stmicro/stmmac/dwmac1000.h

@@ -87,7 +87,7 @@ enum power_event {
 				(reg * 8))
 #define GMAC_ADDR_LOW(reg)	(((reg > 15) ? 0x00000804 : 0x00000044) + \
 				(reg * 8))
-#define GMAC_MAX_PERFECT_ADDRESSES	32
+#define GMAC_MAX_PERFECT_ADDRESSES	1
 
 /* PCS registers (AN/TBI/SGMII/RGMII) offset */
 #define GMAC_AN_CTRL	0x000000c0	/* AN control */

drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c

@@ -97,30 +97,28 @@ static void dwmac1000_get_umac_addr(struct mac_device_info *hw,
 			    GMAC_ADDR_LOW(reg_n));
 }
 
-static void dwmac1000_set_filter(struct net_device *dev, int id)
+static void dwmac1000_set_filter(struct net_device *dev)
 {
 	void __iomem *ioaddr = (void __iomem *)dev->base_addr;
 	unsigned int value = 0;
 	unsigned int perfect_addr_number;
+	u32 mc_filter[2];
 
 	pr_debug("%s: # mcasts %d, # unicast %d\n", __func__,
 		 netdev_mc_count(dev), netdev_uc_count(dev));
 
-	if (dev->flags & IFF_PROMISC)
+	memset(mc_filter, 0, sizeof(mc_filter));
+
+	if (dev->flags & IFF_PROMISC) {
 		value = GMAC_FRAME_FILTER_PR;
-	else if ((netdev_mc_count(dev) > HASH_TABLE_SIZE)
-		 || (dev->flags & IFF_ALLMULTI)) {
+	} else if (dev->flags & IFF_ALLMULTI) {
 		value = GMAC_FRAME_FILTER_PM;	/* pass all multi */
-		writel(0xffffffff, ioaddr + GMAC_HASH_HIGH);
-		writel(0xffffffff, ioaddr + GMAC_HASH_LOW);
 	} else if (!netdev_mc_empty(dev)) {
-		u32 mc_filter[2];
 		struct netdev_hw_addr *ha;
 
 		/* Hash filter for multicast */
 		value = GMAC_FRAME_FILTER_HMC;
 
-		memset(mc_filter, 0, sizeof(mc_filter));
 		netdev_for_each_mc_addr(ha, dev) {
 			/* The upper 6 bits of the calculated CRC are used to
 			 * index the contens of the hash table
@@ -132,15 +130,12 @@ static void dwmac1000_set_filter(struct net_device *dev, int id)
 			 */
 			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
 		}
-		writel(mc_filter[0], ioaddr + GMAC_HASH_LOW);
-		writel(mc_filter[1], ioaddr + GMAC_HASH_HIGH);
 	}
 
-	/* Extra 16 regs are available in cores newer than the 3.40. */
-	if (id > DWMAC_CORE_3_40)
-		perfect_addr_number = GMAC_MAX_PERFECT_ADDRESSES;
-	else
-		perfect_addr_number = GMAC_MAX_PERFECT_ADDRESSES / 2;
+	writel(mc_filter[0], ioaddr + GMAC_HASH_LOW);
+	writel(mc_filter[1], ioaddr + GMAC_HASH_HIGH);
+
+	perfect_addr_number = GMAC_MAX_PERFECT_ADDRESSES;
 
 	/* Handle multiple unicast addresses (perfect filtering) */
 	if (netdev_uc_count(dev) > perfect_addr_number)

drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c

@@ -95,7 +95,7 @@ static void dwmac100_get_umac_addr(struct mac_device_info *hw,
 	stmmac_get_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
 }
 
-static void dwmac100_set_filter(struct net_device *dev, int id)
+static void dwmac100_set_filter(struct net_device *dev)
 {
 	void __iomem *ioaddr = (void __iomem *)dev->base_addr;
 	u32 value = readl(ioaddr + MAC_CONTROL);

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -2225,7 +2225,7 @@ static void stmmac_set_rx_mode(struct net_device *dev)
 	struct stmmac_priv *priv = netdev_priv(dev);
 
 	spin_lock(&priv->lock);
-	priv->hw->mac->set_filter(dev, priv->synopsys_id);
+	priv->hw->mac->set_filter(dev);
 	spin_unlock(&priv->lock);
 }