net: ena: Fix toeplitz initial hash value

On driver initialization, RSS hash initial value is set to zero,
instead of the default value. This happens because we pass NULL as
the RSS key parameter, which caused us to never initialize
the RSS hash value.

This patch fixes it by making sure the initial value is set, no matter
what the value of the RSS key is.

Fixes: 91a65b7d ("net: ena: fix potential crash when rxfh key is NULL")
Signed-off-by: Nati Koler <nkoler@amazon.com>
Signed-off-by: David Arinzon <darinzon@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amazon/ena/ena_com.c

@@ -2400,29 +2400,18 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
 		return -EOPNOTSUPP;
 	}
 
-	switch (func) {
-	case ENA_ADMIN_TOEPLITZ:
-		if (key) {
-			if (key_len != sizeof(hash_key->key)) {
-				netdev_err(ena_dev->net_device,
-					   "key len (%u) doesn't equal the supported size (%zu)\n",
-					   key_len, sizeof(hash_key->key));
-				return -EINVAL;
-			}
-			memcpy(hash_key->key, key, key_len);
-			rss->hash_init_val = init_val;
-			hash_key->key_parts = key_len / sizeof(hash_key->key[0]);
+	if ((func == ENA_ADMIN_TOEPLITZ) && key) {
+		if (key_len != sizeof(hash_key->key)) {
+			netdev_err(ena_dev->net_device,
+				   "key len (%u) doesn't equal the supported size (%zu)\n",
+				   key_len, sizeof(hash_key->key));
+			return -EINVAL;
 		}
-		break;
-	case ENA_ADMIN_CRC32:
-		rss->hash_init_val = init_val;
-		break;
-	default:
-		netdev_err(ena_dev->net_device, "Invalid hash function (%d)\n",
-			   func);
-		return -EINVAL;
+		memcpy(hash_key->key, key, key_len);
+		hash_key->key_parts = key_len / sizeof(hash_key->key[0]);
 	}
 
+	rss->hash_init_val = init_val;
 	old_func = rss->hash_func;
 	rss->hash_func = func;
 	rc = ena_com_set_hash_function(ena_dev);