1 # Copyright 2016 Cisco Systems, Inc. All rights reserved.
3 # Licensed under the Apache License, Version 2.0 (the "License"); you may
4 # not use this file except in compliance with the License. You may obtain
5 # a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 # License for the specific language governing permissions and limitations
18 # IMIX frame size including the 4-byte FCS field
19 IMIX_L2_SIZES = [64, 594, 1518]
20 IMIX_RATIOS = [7, 4, 1]
21 # weighted average l2 frame size includng the 4-byte FCS
22 IMIX_AVG_L2_FRAME_SIZE = sum(
23 [1.0 * imix[0] * imix[1] for imix in zip(IMIX_L2_SIZES, IMIX_RATIOS)]) / sum(IMIX_RATIOS)
31 def convert_rates(l2frame_size, rate, intf_speed):
32 """Convert a given rate unit into the other rate units.
34 l2frame_size: size of the L2 frame in bytes (includes 32-bit FCS) or 'IMIX'
35 rate: a dict that has at least one of the following key:
36 'rate_pps', 'rate_bps', 'rate_percent'
37 with the corresponding input value
38 intf_speed: the line rate speed in bits per second
40 avg_packet_size = get_average_packet_size(l2frame_size)
41 if 'rate_pps' in rate:
43 initial_rate_type = 'rate_pps'
44 pps = rate['rate_pps']
45 bps = pps_to_bps(pps, avg_packet_size)
46 load = bps_to_load(bps, intf_speed)
47 elif 'rate_bps' in rate:
48 # input = bits per second
49 initial_rate_type = 'rate_bps'
50 bps = rate['rate_bps']
51 load = bps_to_load(bps, intf_speed)
52 pps = bps_to_pps(bps, avg_packet_size)
53 elif 'rate_percent' in rate:
54 # input = percentage of the line rate (between 0.0 and 100.0)
55 initial_rate_type = 'rate_percent'
56 load = rate['rate_percent']
57 bps = load_to_bps(load, intf_speed)
58 pps = bps_to_pps(bps, avg_packet_size)
60 raise Exception('Traffic config needs to have a rate type key')
62 'initial_rate_type': initial_rate_type,
63 'rate_pps': int(float(pps)),
65 'rate_bps': int(float(bps))
69 def get_average_packet_size(l2frame_size):
70 """Retrieve the average L2 frame size
72 l2frame_size: an L2 frame size in bytes (including FCS) or 'IMIX'
73 return: average l2 frame size inlcuding the 32-bit FCS
75 if l2frame_size.upper() == 'IMIX':
76 return IMIX_AVG_L2_FRAME_SIZE
77 return float(l2frame_size)
80 def load_to_bps(load_percentage, intf_speed):
81 return float(load_percentage) / 100.0 * intf_speed
84 def bps_to_load(bps, intf_speed):
85 return float(bps) / intf_speed * 100.0
88 def bps_to_pps(bps, avg_packet_size):
89 return float(bps) / (avg_packet_size + 20.0) / 8
92 def pps_to_bps(pps, avg_packet_size):
93 return float(pps) * (avg_packet_size + 20.0) * 8
96 def weighted_avg(weight, count):
99 return sum([x[0] * x[1] for x in zip(weight, count)]) / sum(weight)
102 def _get_bitmath_rate(rate_bps):
103 rate = rate_bps.replace('ps', '').strip()
104 bitmath_rate = bitmath.parse_string(rate)
105 if bitmath_rate.bits <= 0:
106 raise Exception('%s is out of valid range' % rate_bps)
109 def parse_rate_str(rate_str):
110 if rate_str.endswith('pps'):
111 rate_pps = rate_str[:-3]
113 raise Exception('%s is missing a numeric value' % rate_str)
115 multiplier = multiplier_map[rate_pps[-1].upper()]
116 rate_pps = rate_pps[:-1]
119 rate_pps = int(float(rate_pps.strip()) * multiplier)
121 raise Exception('%s is out of valid range' % rate_str)
122 return {'rate_pps': str(rate_pps)}
123 if rate_str.endswith('ps'):
124 rate = rate_str.replace('ps', '').strip()
125 bit_rate = bitmath.parse_string(rate).bits
127 raise Exception('%s is out of valid range' % rate_str)
128 return {'rate_bps': str(int(bit_rate))}
129 if rate_str.endswith('%'):
130 rate_percent = float(rate_str.replace('%', '').strip())
131 if rate_percent <= 0 or rate_percent > 100.0:
132 raise Exception('%s is out of valid range (must be 1-100%%)' % rate_str)
133 return {'rate_percent': str(rate_percent)}
134 raise Exception('Unknown rate string format %s' % rate_str)
136 def get_load_from_rate(rate_str, avg_frame_size=64, line_rate='10Gbps'):
137 '''From any rate string (with unit) return the corresponding load (in % unit)
139 :param str rate_str: the rate to convert - must end with a unit (e.g. 1Mpps, 30%, 1Gbps)
140 :param int avg_frame_size: average frame size in bytes (needed only if pps is given)
141 :param str line_rate: line rate ending with bps unit (e.g. 1Mbps, 10Gbps) is the rate that
142 corresponds to 100% rate
143 :return float: the corresponding rate in % of line rate
145 rate_dict = parse_rate_str(rate_str)
146 if 'rate_percent' in rate_dict:
147 return float(rate_dict['rate_percent'])
148 lr_bps = _get_bitmath_rate(line_rate).bits
149 if 'rate_bps' in rate_dict:
150 bps = int(rate_dict['rate_bps'])
153 pps = rate_dict['rate_pps']
154 bps = pps_to_bps(pps, avg_frame_size)
155 return bps_to_load(bps, lr_bps)
157 def divide_rate(rate, divisor):
158 if 'rate_pps' in rate:
160 value = int(rate[key])
161 elif 'rate_bps' in rate:
163 value = int(rate[key])
166 value = float(rate[key])
169 rate[key] = str(value) if value else str(1)
173 def to_rate_str(rate):
174 if 'rate_pps' in rate:
175 pps = rate['rate_pps']
176 return '{}pps'.format(pps)
177 if 'rate_bps' in rate:
178 bps = rate['rate_bps']
179 return '{}bps'.format(bps)
180 if 'rate_percent' in rate:
181 load = rate['rate_percent']
182 return '{}%'.format(load)
184 # avert pylint warning
189 """Replaces every occurence of 'N/A' with float nan."""
190 for k, v in d.items():
191 if isinstance(v, dict):
198 """Converts MAC address to integer representation."""
199 return int(mac.translate(None, ":.- "), 16)
203 """Converts integer representation of MAC address to hex string."""
204 mac = format(i, 'x').zfill(12)
205 blocks = [mac[x:x + 2] for x in range(0, len(mac), 2)]
206 return ':'.join(blocks)