Add logic to generate global pause frames

[wendani]

Signed-off-by: Wenda [email protected]

Description of PR

Summary:
Fixes # (issue)

Type of change

• [] Bug fix
• [] Testbed and Framework(new/improvement)
• Test case(new/improvement)

Approach

How did you do it?

How did you verify/test it?

Tested on dut:

$sudo python pfc_gen.py -p 16 -t 65535 -n 100000000 -i et7 -r 10.64.247.225

Every 2.0s: bcmcmd "show c xe6" | grep -E "RXPF|PFC|RXPP"                                                                                    Wed Oct 10 04:06:03 2018

RXPP.xe6                    :            59,521,457             +90,504          43,029/s
RPFC4.xe6                   :            59,597,193             +98,714           5,605/s


$sudo python pfc_gen.py -g -t 65535 -n 100000000 -i et7 -r 10.64.247.225

Every 2.0s: bcmcmd "show c xe6" | grep -E "RXPF|PFC|RXPP"                                                                                    Wed Oct 10 04:07:05 2018

RXPF.xe6                    :           103,264,765            +193,943          91,976/s


$ sudo python pfc_gen.py -g -p 16 -t 65535 -n 100000000 -i et7 -r 10.64.247.225
'-p' option is not valid when sending global pause frames ('--global' / '-g')
Usage: pfc_gen.py [options] arg1 arg2

Options:
  -h, --help            show this help message and exit
  -i Interface, --interface=Interface
                        Interface list to send packets, seperated by ','
  -p Priority, --priority=Priority
                        PFC class enable bitmap.
  -t time, --time=time  Pause time in quanta for global pause or enabled class
  -n number, --num=number
                        Number of packets to be sent
  -r IPAddress, --rsyslog-server=IPAddress
                        Rsyslog server IPv4 address
  -g, --global          Send global pause frames (not PFC)

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[lguohan]

duplicated with pfc_gen.py? can you merge this into pfc_gen.py and add an option to do that?

[wendani]

Merged into pfc_gen.py

#720 (comment)