net: stmmac: selftests: Prevent false positives in filter tests

In L2 tests that filter packets by destination MAC address we need to
prevent false positives that can occur if we add an address that
collides with the existing ones.

To fix this, lets manually check if the new address to be added is
already present in the NIC and use a different one if so. For Hash
filtering this also envolves converting the address to the hash.

Fixes: 091810db ("net: stmmac: Introduce selftests support")
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -6,7 +6,9 @@
  * Author: Jose Abreu <joabreu@synopsys.com>
  */
 
+#include <linux/bitrev.h>
 #include <linux/completion.h>
+#include <linux/crc32.h>
 #include <linux/ethtool.h>
 #include <linux/ip.h>
 #include <linux/phy.h>
@@ -485,12 +487,48 @@ static int stmmac_filter_check(struct stmmac_priv *priv)
 	return -EOPNOTSUPP;
 }
 
+static bool stmmac_hash_check(struct stmmac_priv *priv, unsigned char *addr)
+{
+	int mc_offset = 32 - priv->hw->mcast_bits_log2;
+	struct netdev_hw_addr *ha;
+	u32 hash, hash_nr;
+
+	/* First compute the hash for desired addr */
+	hash = bitrev32(~crc32_le(~0, addr, 6)) >> mc_offset;
+	hash_nr = hash >> 5;
+	hash = 1 << (hash & 0x1f);
+
+	/* Now, check if it collides with any existing one */
+	netdev_for_each_mc_addr(ha, priv->dev) {
+		u32 nr = bitrev32(~crc32_le(~0, ha->addr, ETH_ALEN)) >> mc_offset;
+		if (((nr >> 5) == hash_nr) && ((1 << (nr & 0x1f)) == hash))
+			return false;
+	}
+
+	/* No collisions, address is good to go */
+	return true;
+}
+
+static bool stmmac_perfect_check(struct stmmac_priv *priv, unsigned char *addr)
+{
+	struct netdev_hw_addr *ha;
+
+	/* Check if it collides with any existing one */
+	netdev_for_each_uc_addr(ha, priv->dev) {
+		if (!memcmp(ha->addr, addr, ETH_ALEN))
+			return false;
+	}
+
+	/* No collisions, address is good to go */
+	return true;
+}
+
 static int stmmac_test_hfilt(struct stmmac_priv *priv)
 {
-	unsigned char gd_addr[ETH_ALEN] = {0x01, 0xee, 0xdd, 0xcc, 0xbb, 0xaa};
-	unsigned char bd_addr[ETH_ALEN] = {0x01, 0x01, 0x02, 0x03, 0x04, 0x05};
+	unsigned char gd_addr[ETH_ALEN] = {0xf1, 0xee, 0xdd, 0xcc, 0xbb, 0xaa};
+	unsigned char bd_addr[ETH_ALEN] = {0xf1, 0xff, 0xff, 0xff, 0xff, 0xff};
 	struct stmmac_packet_attrs attr = { };
-	int ret;
+	int ret, tries = 256;
 
 	ret = stmmac_filter_check(priv);
 	if (ret)
@@ -499,6 +537,16 @@ static int stmmac_test_hfilt(struct stmmac_priv *priv)
 	if (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
 		return -EOPNOTSUPP;
 
+	while (--tries) {
+		/* We only need to check the bd_addr for collisions */
+		bd_addr[ETH_ALEN - 1] = tries;
+		if (stmmac_hash_check(priv, bd_addr))
+			break;
+	}
+
+	if (!tries)
+		return -EOPNOTSUPP;
+
 	ret = dev_mc_add(priv->dev, gd_addr);
 	if (ret)
 		return ret;
@@ -523,13 +571,25 @@ static int stmmac_test_hfilt(struct stmmac_priv *priv)
 
 static int stmmac_test_pfilt(struct stmmac_priv *priv)
 {
-	unsigned char gd_addr[ETH_ALEN] = {0x00, 0x01, 0x44, 0x55, 0x66, 0x77};
-	unsigned char bd_addr[ETH_ALEN] = {0x08, 0x00, 0x22, 0x33, 0x44, 0x55};
+	unsigned char gd_addr[ETH_ALEN] = {0xf0, 0x01, 0x44, 0x55, 0x66, 0x77};
+	unsigned char bd_addr[ETH_ALEN] = {0xf0, 0xff, 0xff, 0xff, 0xff, 0xff};
 	struct stmmac_packet_attrs attr = { };
-	int ret;
+	int ret, tries = 256;
 
 	if (stmmac_filter_check(priv))
 		return -EOPNOTSUPP;
+	if (netdev_uc_count(priv->dev) >= priv->hw->unicast_filter_entries)
+		return -EOPNOTSUPP;
+
+	while (--tries) {
+		/* We only need to check the bd_addr for collisions */
+		bd_addr[ETH_ALEN - 1] = tries;
+		if (stmmac_perfect_check(priv, bd_addr))
+			break;
+	}
+
+	if (!tries)
+		return -EOPNOTSUPP;
 
 	ret = dev_uc_add(priv->dev, gd_addr);
 	if (ret)
@@ -553,39 +613,31 @@ static int stmmac_test_pfilt(struct stmmac_priv *priv)
 	return ret;
 }
 
-static int stmmac_dummy_sync(struct net_device *netdev, const u8 *addr)
-{
-	return 0;
-}
-
-static void stmmac_test_set_rx_mode(struct net_device *netdev)
-{
-	/* As we are in test mode of ethtool we already own the rtnl lock
-	 * so no address will change from user. We can just call the
-	 * ndo_set_rx_mode() callback directly */
-	if (netdev->netdev_ops->ndo_set_rx_mode)
-		netdev->netdev_ops->ndo_set_rx_mode(netdev);
-}
-
 static int stmmac_test_mcfilt(struct stmmac_priv *priv)
 {
-	unsigned char uc_addr[ETH_ALEN] = {0x00, 0x01, 0x44, 0x55, 0x66, 0x77};
-	unsigned char mc_addr[ETH_ALEN] = {0x01, 0x01, 0x44, 0x55, 0x66, 0x77};
+	unsigned char uc_addr[ETH_ALEN] = {0xf0, 0xff, 0xff, 0xff, 0xff, 0xff};
+	unsigned char mc_addr[ETH_ALEN] = {0xf1, 0xff, 0xff, 0xff, 0xff, 0xff};
 	struct stmmac_packet_attrs attr = { };
-	int ret;
+	int ret, tries = 256;
 
 	if (stmmac_filter_check(priv))
 		return -EOPNOTSUPP;
-	if (!priv->hw->multicast_filter_bins)
+	if (netdev_uc_count(priv->dev) >= priv->hw->unicast_filter_entries)
 		return -EOPNOTSUPP;
 
-	/* Remove all MC addresses */
-	__dev_mc_unsync(priv->dev, NULL);
-	stmmac_test_set_rx_mode(priv->dev);
+	while (--tries) {
+		/* We only need to check the mc_addr for collisions */
+		mc_addr[ETH_ALEN - 1] = tries;
+		if (stmmac_hash_check(priv, mc_addr))
+			break;
+	}
+
+	if (!tries)
+		return -EOPNOTSUPP;
 
 	ret = dev_uc_add(priv->dev, uc_addr);
 	if (ret)
-		goto cleanup;
+		return ret;
 
 	attr.dst = uc_addr;
 
@@ -602,30 +654,34 @@ static int stmmac_test_mcfilt(struct stmmac_priv *priv)
 
 cleanup:
 	dev_uc_del(priv->dev, uc_addr);
-	__dev_mc_sync(priv->dev, stmmac_dummy_sync, NULL);
-	stmmac_test_set_rx_mode(priv->dev);
 	return ret;
 }
 
 static int stmmac_test_ucfilt(struct stmmac_priv *priv)
 {
-	unsigned char uc_addr[ETH_ALEN] = {0x00, 0x01, 0x44, 0x55, 0x66, 0x77};
-	unsigned char mc_addr[ETH_ALEN] = {0x01, 0x01, 0x44, 0x55, 0x66, 0x77};
+	unsigned char uc_addr[ETH_ALEN] = {0xf0, 0xff, 0xff, 0xff, 0xff, 0xff};
+	unsigned char mc_addr[ETH_ALEN] = {0xf1, 0xff, 0xff, 0xff, 0xff, 0xff};
 	struct stmmac_packet_attrs attr = { };
-	int ret;
+	int ret, tries = 256;
 
 	if (stmmac_filter_check(priv))
 		return -EOPNOTSUPP;
-	if (!priv->hw->multicast_filter_bins)
+	if (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
 		return -EOPNOTSUPP;
 
-	/* Remove all UC addresses */
-	__dev_uc_unsync(priv->dev, NULL);
-	stmmac_test_set_rx_mode(priv->dev);
+	while (--tries) {
+		/* We only need to check the uc_addr for collisions */
+		uc_addr[ETH_ALEN - 1] = tries;
+		if (stmmac_perfect_check(priv, uc_addr))
+			break;
+	}
+
+	if (!tries)
+		return -EOPNOTSUPP;
 
 	ret = dev_mc_add(priv->dev, mc_addr);
 	if (ret)
-		goto cleanup;
+		return ret;
 
 	attr.dst = mc_addr;
 
@@ -642,8 +698,6 @@ static int stmmac_test_ucfilt(struct stmmac_priv *priv)
 
 cleanup:
 	dev_mc_del(priv->dev, mc_addr);
-	__dev_uc_sync(priv->dev, stmmac_dummy_sync, NULL);
-	stmmac_test_set_rx_mode(priv->dev);
 	return ret;
 }