net: stmmac: add support for hash table size 128/256 in dwmac4

1. get hash table size in hw feature reigster, and add support
for taller hash table(128/256) in dwmac4.
2. only clear GMAC_PACKET_FILTER bits used in this function,
to avoid side effect to functions of other bits.

stmmac selftests output log with flow control on:
	ethtool -t eth0
	The test result is PASS
	The test extra info:
	 1. MAC Loopback                 0
	 2. PHY Loopback                 -95
	 3. MMC Counters                 0
	 4. EEE                          -95
	 5. Hash Filter MC               0
	 6. Perfect Filter UC            0
	 7. MC Filter                    0
	 8. UC Filter                    0
	 9. Flow Control                 0
Signed-off-by: Biao Huang <biao.huang@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -326,6 +326,7 @@ struct dma_features {
 	/* 802.3az - Energy-Efficient Ethernet (EEE) */
 	unsigned int eee;
 	unsigned int av;
+	unsigned int hash_tb_sz;
 	unsigned int tsoen;
 	/* TX and RX csum */
 	unsigned int tx_coe;
@@ -424,9 +425,9 @@ struct mac_device_info {
 	struct mii_regs mii;	/* MII register Addresses */
 	struct mac_link link;
 	void __iomem *pcsr;     /* vpointer to device CSRs */
-	int multicast_filter_bins;
-	int unicast_filter_entries;
-	int mcast_bits_log2;
+	unsigned int multicast_filter_bins;
+	unsigned int unicast_filter_entries;
+	unsigned int mcast_bits_log2;
 	unsigned int rx_csum;
 	unsigned int pcs;
 	unsigned int pmt;

drivers/net/ethernet/stmicro/stmmac/dwmac4.h

@@ -15,8 +15,7 @@
 /*  MAC registers */
 #define GMAC_CONFIG			0x00000000
 #define GMAC_PACKET_FILTER		0x00000008
-#define GMAC_HASH_TAB_0_31		0x00000010
-#define GMAC_HASH_TAB_32_63		0x00000014
+#define GMAC_HASH_TAB(x)		(0x10 + (x) * 4)
 #define GMAC_RX_FLOW_CTRL		0x00000090
 #define GMAC_QX_TX_FLOW_CTRL(x)		(0x70 + x * 4)
 #define GMAC_TXQ_PRTY_MAP0		0x98
@@ -181,6 +180,7 @@ enum power_event {
 #define GMAC_HW_FEAT_MIISEL		BIT(0)
 
 /* MAC HW features1 bitmap */
+#define GMAC_HW_HASH_TB_SZ		GENMASK(25, 24)
 #define GMAC_HW_FEAT_AVSEL		BIT(20)
 #define GMAC_HW_TSOEN			BIT(18)
 #define GMAC_HW_TXFIFOSIZE		GENMASK(10, 6)

drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c

@@ -400,41 +400,50 @@ static void dwmac4_set_filter(struct mac_device_info *hw,
 			      struct net_device *dev)
 {
 	void __iomem *ioaddr = (void __iomem *)dev->base_addr;
-	unsigned int value = 0;
+	int numhashregs = (hw->multicast_filter_bins >> 5);
+	int mcbitslog2 = hw->mcast_bits_log2;
+	unsigned int value;
+	int i;
 
+	value = readl(ioaddr + GMAC_PACKET_FILTER);
+	value &= ~GMAC_PACKET_FILTER_HMC;
+	value &= ~GMAC_PACKET_FILTER_HPF;
+	value &= ~GMAC_PACKET_FILTER_PCF;
+	value &= ~GMAC_PACKET_FILTER_PM;
+	value &= ~GMAC_PACKET_FILTER_PR;
 	if (dev->flags & IFF_PROMISC) {
 		value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_PCF;
 	} else if ((dev->flags & IFF_ALLMULTI) ||
-			(netdev_mc_count(dev) > HASH_TABLE_SIZE)) {
+		   (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
 		/* Pass all multi */
-		value = GMAC_PACKET_FILTER_PM;
-		/* Set the 64 bits of the HASH tab. To be updated if taller
-		 * hash table is used
-		 */
-		writel(0xffffffff, ioaddr + GMAC_HASH_TAB_0_31);
-		writel(0xffffffff, ioaddr + GMAC_HASH_TAB_32_63);
+		value |= GMAC_PACKET_FILTER_PM;
+		/* Set all the bits of the HASH tab */
+		for (i = 0; i < numhashregs; i++)
+			writel(0xffffffff, ioaddr + GMAC_HASH_TAB(i));
 	} else if (!netdev_mc_empty(dev)) {
-		u32 mc_filter[2];
 		struct netdev_hw_addr *ha;
+		u32 mc_filter[8];
 
 		/* Hash filter for multicast */
-		value = GMAC_PACKET_FILTER_HMC;
+		value |= GMAC_PACKET_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 content of the Hash Table Reg 0 and 1.
+			/* The upper n bits of the calculated CRC are used to
+			 * index the contents of the hash table. The number of
+			 * bits used depends on the hardware configuration
+			 * selected at core configuration time.
 			 */
-			int bit_nr =
-				(bitrev32(~crc32_le(~0, ha->addr, 6)) >> 26);
-			/* The most significant bit determines the register
-			 * to use while the other 5 bits determines the bit
-			 * within the selected register
+			int bit_nr = bitrev32(~crc32_le(~0, ha->addr,
+					ETH_ALEN)) >> (32 - mcbitslog2);
+			/* The most significant bit determines the register to
+			 * use (H/L) while the other 5 bits determine the bit
+			 * within the register.
 			 */
-			mc_filter[bit_nr >> 5] |= (1 << (bit_nr & 0x1F));
+			mc_filter[bit_nr >> 5] |= (1 << (bit_nr & 0x1f));
 		}
-		writel(mc_filter[0], ioaddr + GMAC_HASH_TAB_0_31);
-		writel(mc_filter[1], ioaddr + GMAC_HASH_TAB_32_63);
+		for (i = 0; i < numhashregs; i++)
+			writel(mc_filter[i], ioaddr + GMAC_HASH_TAB(i));
 	}
 
 	value |= GMAC_PACKET_FILTER_HPF;

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

@@ -351,6 +351,7 @@ static void dwmac4_get_hw_feature(void __iomem *ioaddr,
 
 	/* MAC HW feature1 */
 	hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
+	dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
 	dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
 	dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
 	/* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by

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

@@ -4107,6 +4107,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 		priv->plat->enh_desc = priv->dma_cap.enh_desc;
 		priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
 		priv->hw->pmt = priv->plat->pmt;
+		if (priv->dma_cap.hash_tb_sz) {
+			priv->hw->multicast_filter_bins =
+					(BIT(priv->dma_cap.hash_tb_sz) << 5);
+			priv->hw->mcast_bits_log2 =
+					ilog2(priv->hw->multicast_filter_bins);
+		}
 
 		/* TXCOE doesn't work in thresh DMA mode */
 		if (priv->plat->force_thresh_dma_mode)