# Distributed under the OpenFlow Software License (see LICENSE)
# Copyright (c) 2012, 2013 Big Switch Networks, Inc.
"""
BSN gentable extension test cases
"""

import logging
import math

from oftest import config
import oftest.base_tests as base_tests
import ofp

from oftest.testutils import *

# Hardcoded in the switch to ease testing
TABLE_ID = 0

def tlv_dict(tlvs):
    d = {}
    for tlv in tlvs:
        d[tlv.__class__] = tlv.value
    return d

def make_checksum(hi, lo):
    """
    Place 'hi' in the upper 8 bits and 'lo' in the lower bits.
    """
    return ((hi & 0xff) << 120) | lo

assert make_checksum(0xab, 0xcd) == 0xab0000000000000000000000000000cd

class BaseGenTableTest(base_tests.SimpleProtocol):
    def setUp(self):
        base_tests.SimpleProtocol.setUp(self)
        self.do_clear()

    def tearDown(self):
        self.do_clear()
        base_tests.SimpleProtocol.tearDown(self)

    def do_clear(self, checksum=0, checksum_mask=0):
        request = ofp.message.bsn_gentable_clear_request(
            table_id=TABLE_ID,
            checksum=0,
            checksum_mask=0)
        response, _ = self.controller.transact(request)
        self.assertIsInstance(response, ofp.message.bsn_gentable_clear_reply)
        self.assertEquals(response.error_count, 0)

    def do_add(self, vlan_vid, ipv4, mac, idle_notification=False, checksum=0):
        msg = ofp.message.bsn_gentable_entry_add(
            table_id=TABLE_ID,
            key=[
                ofp.bsn_tlv.vlan_vid(vlan_vid),
                ofp.bsn_tlv.ipv4(ipv4)],
            value=[
                ofp.bsn_tlv.mac(mac)],
            checksum=checksum)
        if idle_notification:
            msg.value.append(ofp.bsn_tlv.idle_notification())
        self.controller.message_send(msg)

    def do_delete(self, vlan_vid, ipv4):
        msg = ofp.message.bsn_gentable_entry_delete(
            table_id=TABLE_ID,
            key=[
                ofp.bsn_tlv.vlan_vid(vlan_vid),
                ofp.bsn_tlv.ipv4(ipv4)])
        self.controller.message_send(msg)

    def do_entry_stats(self, checksum=0, checksum_mask=0):
        request = ofp.message.bsn_gentable_entry_stats_request(
            table_id=TABLE_ID,
            checksum=checksum,
            checksum_mask=checksum_mask)
        return get_stats(self, request)

    def do_entry_desc_stats(self, checksum=0, checksum_mask=0):
        request = ofp.message.bsn_gentable_entry_desc_stats_request(
            table_id=TABLE_ID,
            checksum=checksum,
            checksum_mask=checksum_mask)
        return get_stats(self, request)

    def do_table_desc_stats(self):
        request = ofp.message.bsn_gentable_desc_stats_request()
        return get_stats(self, request)

    def do_table_stats(self):
        request = ofp.message.bsn_gentable_stats_request()
        return get_stats(self, request)

    def do_test_table_stats(self):
        entries = self.do_table_stats()
        for entry in entries:
            if entry.table_id == TABLE_ID:
                return entry
        raise AssertionError("did not find test table")

    def do_bucket_stats(self):
        request = ofp.message.bsn_gentable_bucket_stats_request(table_id=TABLE_ID)
        return get_stats(self, request)

    def do_set_buckets_size(self, buckets_size):
        msg = ofp.message.bsn_gentable_set_buckets_size(
            table_id=TABLE_ID,
            buckets_size=buckets_size)
        self.controller.message_send(msg)

class ClearAll(BaseGenTableTest):
    """
    Test clearing entire table
    """
    def runTest(self):
        # Add a few entries
        for i in range(0, 3):
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        # Delete all entries
        request = ofp.message.bsn_gentable_clear_request(table_id=TABLE_ID)
        response, _ = self.controller.transact(request)
        self.assertIsInstance(response, ofp.message.bsn_gentable_clear_reply)
        self.assertEquals(response.error_count, 0)
        self.assertEquals(response.deleted_count, 3)

class AddDelete(BaseGenTableTest):
    """
    Test adding and deleting entries
    """
    def runTest(self):
        # Add a few entries
        for i in range(0, 3):
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        # Delete each entry
        for i in range(0, 3):
            self.do_delete(vlan_vid=i, ipv4=0x12345678)

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        # Clear table, but expect it to have already been empty
        request = ofp.message.bsn_gentable_clear_request(table_id=TABLE_ID)
        response, _ = self.controller.transact(request)
        self.assertIsInstance(response, ofp.message.bsn_gentable_clear_reply)
        self.assertEquals(response.error_count, 0)
        self.assertEquals(response.deleted_count, 0)

class EntryStats(BaseGenTableTest):
    """
    Test retrieving entry stats
    """
    def runTest(self):
        # Add a few entries
        for i in range(0, 3):
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        entries = self.do_entry_stats()
        seen = set()
        for entry in entries:
            logging.debug(entry.show())
            key = tlv_dict(entry.key)
            stats = tlv_dict(entry.stats)
            self.assertIn(ofp.bsn_tlv.vlan_vid, key)
            self.assertIn(ofp.bsn_tlv.ipv4, key)
            self.assertIn(ofp.bsn_tlv.rx_packets, stats)
            self.assertIn(ofp.bsn_tlv.tx_packets, stats)
            vlan_vid = key[ofp.bsn_tlv.vlan_vid]
            seen.add(vlan_vid)
            self.assertEqual(key[ofp.bsn_tlv.ipv4], 0x12345678)
            self.assertEqual(stats[ofp.bsn_tlv.rx_packets], 100 * vlan_vid)
            self.assertEqual(stats[ofp.bsn_tlv.tx_packets], 101 * vlan_vid)

        self.assertEquals(seen, set([0, 1, 2]))

class EntryDescStats(BaseGenTableTest):
    """
    Test retrieving entry desc stats
    """
    def runTest(self):
        # Add a few entries
        for i in range(0, 3):
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i),
                        checksum=0xfedcba9876543210fedcba9876543210 + i)

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        entries = self.do_entry_desc_stats()
        seen = set()
        for entry in entries:
            logging.debug(entry.show())
            key = tlv_dict(entry.key)
            value = tlv_dict(entry.value)
            self.assertIn(ofp.bsn_tlv.vlan_vid, key)
            self.assertIn(ofp.bsn_tlv.ipv4, key)
            self.assertIn(ofp.bsn_tlv.mac, value)
            vlan_vid = key[ofp.bsn_tlv.vlan_vid]
            seen.add(vlan_vid)
            self.assertEqual(key[ofp.bsn_tlv.ipv4], 0x12345678)
            self.assertEqual(value[ofp.bsn_tlv.mac], [0, 1, 2, 3, 4, vlan_vid])
            self.assertEqual(entry.checksum, 0xfedcba9876543210fedcba9876543210 + vlan_vid)

        self.assertEquals(seen, set([0, 1, 2]))

class TableDescStats(BaseGenTableTest):
    """
    Test retrieving table desc stats
    """
    def runTest(self):
        entries = self.do_table_desc_stats()
        seen = set()
        for entry in entries:
            logging.debug(entry.show())
            self.assertNotIn(entry.table_id, seen)
            self.assertNotIn(entry.name, seen)
            seen.add(entry.table_id)
            seen.add(entry.name)
            if entry.table_id == TABLE_ID:
                self.assertEqual(entry.name, "test")
                self.assertEqual(entry.buckets_size, 64)
                self.assertEqual(entry.max_entries, 1000)

        self.assertIn(TABLE_ID, seen)

class TableStats(BaseGenTableTest):
    """
    Test retrieving table stats
    """
    def runTest(self):
        # Verify we have the test table and no duplicates
        entries = self.do_table_stats()
        seen = set()
        for entry in entries:
            logging.debug(entry.show())
            self.assertNotIn(entry.table_id, seen)
            seen.add(entry.table_id)
            if entry.table_id == TABLE_ID:
                self.assertEqual(entry.entry_count, 0)
                self.assertEqual(entry.checksum, 0)
        self.assertIn(TABLE_ID, seen)

        table_checksum = 0

        # Add a bunch of entries, spread among the checksum buckets
        for i in range(0, 256):
            table_checksum ^= make_checksum(i, i*31)
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i),
                        checksum=make_checksum(i, i*31))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        table_stats = self.do_test_table_stats()
        self.assertEqual(table_stats.entry_count, 256)
        self.assertEqual(table_stats.checksum, table_checksum)

        # Modify an entry, changing its checksum
        i = 30
        table_checksum ^= make_checksum(i, i*31) # subtract old checksum
        table_checksum ^= make_checksum(i, i*37) # add new checksum
        self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 4, 3, 2, 1, i),
                    checksum=make_checksum(i, i*37))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        table_stats = self.do_test_table_stats()
        self.assertEqual(table_stats.entry_count, 256)
        self.assertEqual(table_stats.checksum, table_checksum)

        # Delete an entry
        i = 87
        table_checksum ^= make_checksum(i, i*31)
        self.do_delete(vlan_vid=i, ipv4=0x12345678)

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        table_stats = self.do_test_table_stats()
        self.assertEqual(table_stats.entry_count, 255)
        self.assertEqual(table_stats.checksum, table_checksum)

class BucketStats(BaseGenTableTest):
    """
    Test retrieving checksum bucket stats
    """
    def runTest(self):
        # Verify initial state
        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for entry in entries:
            self.assertEquals(entry.checksum, 0)

        buckets = [0] * len(entries)
        checksum_bits = int(math.log(len(buckets), 2))

        def update_bucket(checksum):
            index = checksum >> (128 - checksum_bits)
            buckets[index] ^= checksum

        # Add a bunch of entries, spread among the checksum buckets
        for i in range(0, 256):
            update_bucket(make_checksum(i, i*31))
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i),
                        checksum=make_checksum(i, i*31))

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets[i])

        # Modify an entry, changing its checksum
        i = 30
        update_bucket(make_checksum(i, i*31)) # subtract old checksum
        update_bucket(make_checksum(i, i*37)) # add new checksum
        self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 4, 3, 2, 1, i),
                    checksum=make_checksum(i, i*37))

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets[i])

        # Delete an entry
        i = 87
        update_bucket(make_checksum(i, i*31))
        self.do_delete(vlan_vid=i, ipv4=0x12345678)

        do_barrier(self.controller)
        verify_no_errors(self.controller)

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets[i])

class SetBucketsSize(BaseGenTableTest):
    """
    Test setting the checksum buckets size
    """
    def setUp(self):
        BaseGenTableTest.setUp(self)
        self.do_set_buckets_size(64)
        do_barrier(self.controller)

    def tearDown(self):
        self.do_set_buckets_size(64)
        do_barrier(self.controller)
        BaseGenTableTest.tearDown(self)

    def runTest(self):
        # Verify initial state
        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for entry in entries:
            self.assertEquals(entry.checksum, 0)

        buckets32 = [0] * 32
        buckets64 = [0] * 64

        def update_bucket(checksum):
            buckets32[checksum >> (128 - int(math.log(32, 2)))] ^= checksum
            buckets64[checksum >> (128 - int(math.log(64, 2)))] ^= checksum

        # Add a bunch of entries, spread among the checksum buckets
        for i in range(0, 256):
            update_bucket(make_checksum(i, i*31))
            self.do_add(vlan_vid=i, ipv4=0x12345678, mac=(0, 1, 2, 3, 4, i),
                        checksum=make_checksum(i, i*31))

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets64[i])

        self.do_set_buckets_size(32)
        do_barrier(self.controller)

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 32)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets32[i])

        self.do_set_buckets_size(64)
        do_barrier(self.controller)

        entries = self.do_bucket_stats()
        self.assertEquals(len(entries), 64)
        for i, entry in enumerate(entries):
            self.assertEquals(entry.checksum, buckets64[i])