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## Example setup {#libmemif_example_setup_doc}
#### VPP-memif master icmp_responder slave
> Libmemif example app(s) use memif default socket file: `/run/vpp/memif.sock`.
Run VPP and icmpr-epoll example (default example when running in container).
> Other examples work similar to icmpr-epoll. Brief explanation can be found in @ref libmemif_examples_doc .
VPP-side config:
```
DBGvpp# create memif id 0 master
DBGvpp# set int state memif0/0 up
DBGvpp# set int ip address memif0/0 192.168.1.1/24
```
icmpr-epoll:
```
conn 0 0
```
Memif in slave mode will try to connect every 2 seconds. If connection establishment is successful, a message will show.
```
INFO: memif connected!
```
> Error messages like "unmatched interface id" are printed only in debug mode.
Check connected status.
Use show command in icmpr-epoll:
```
show
MEMIF DETAILS
==============================
interface index: 0
interface ip: 192.168.1.2
interface name: memif_connection
app name: ICMP_Responder
remote interface name: memif0/0
remote app name: VPP 17.10-rc0~132-g62f9cdd
id: 0
secret:
role: slave
mode: ethernet
socket filename: /run/vpp/memif.sock
rx queues:
queue id: 0
ring size: 1024
buffer size: 2048
tx queues:
queue id: 0
ring size: 1024
buffer size: 2048
link: up
interface index: 1
no connection
```
Use sh memif command in VPP:
```
DBGvpp# sh memif
interface memif0/0
remote-name "ICMP_Responder"
remote-interface "memif_connection"
id 0 mode ethernet file /run/vpp/memif.sock
flags admin-up connected
listener-fd 12 conn-fd 13
num-s2m-rings 1 num-m2s-rings 1 buffer-size 0
master-to-slave ring 0:
region 0 offset 32896 ring-size 1024 int-fd 16
head 0 tail 0 flags 0x0000 interrupts 0
master-to-slave ring 0:
region 0 offset 0 ring-size 1024 int-fd 15
head 0 tail 0 flags 0x0001 interrupts 0
```
Send ping from VPP to icmpr-epoll:
```
DBGvpp# ping 192.168.1.2
64 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=.1888 ms
64 bytes from 192.168.1.2: icmp_seq=3 ttl=64 time=.1985 ms
64 bytes from 192.168.1.2: icmp_seq=4 ttl=64 time=.1813 ms
64 bytes from 192.168.1.2: icmp_seq=5 ttl=64 time=.1929 ms
Statistics: 5 sent, 4 received, 20% packet loss
```
#### multiple queues VPP-memif slave icmp_responder master
Run icmpr-epoll as in previous example setup.
Run VPP with startup conf, enabling 2 worker threads.
Example startup.conf:
```
unix {
interactive
nodaemon
full-coredump
}
cpu {
workers 2
}
```
VPP-side config:
```
DBGvpp# create memif id 0 slave rx-queues 2 tx-queues 2
DBGvpp# set int state memif0/0 up
DBGvpp# set int ip address memif0/0 192.168.1.1/24
```
icmpr-epoll:
```
conn 0 1
```
When connection is established a message will print:
```
INFO: memif connected!
```
> Error messages like "unmatched interface id" are printed only in debug mode.
Check connected status.
Use show command in icmpr-epoll:
```
show
MEMIF DETAILS
==============================
interface index: 0
interface ip: 192.168.1.2
interface name: memif_connection
app name: ICMP_Responder
remote interface name: memif0/0
remote app name: VPP 17.10-rc0~132-g62f9cdd
id: 0
secret:
role: master
mode: ethernet
socket filename: /run/vpp/memif.sock
rx queues:
queue id: 0
ring size: 1024
buffer size: 2048
queue id: 1
ring size: 1024
buffer size: 2048
tx queues:
queue id: 0
ring size: 1024
buffer size: 2048
queue id: 1
ring size: 1024
buffer size: 2048
link: up
interface index: 1
no connection
```
Use sh memif command in VPP:
```
DBGvpp# sh memif
interface memif0/0
remote-name "ICMP_Responder"
remote-interface "memif_connection"
id 0 mode ethernet file /run/vpp/memif.sock
flags admin-up slave connected
listener-fd -1 conn-fd 12
num-s2m-rings 2 num-m2s-rings 2 buffer-size 2048
slave-to-master ring 0:
region 0 offset 0 ring-size 1024 int-fd 14
head 0 tail 0 flags 0x0000 interrupts 0
slave-to-master ring 1:
region 0 offset 32896 ring-size 1024 int-fd 15
head 0 tail 0 flags 0x0000 interrupts 0
slave-to-master ring 0:
region 0 offset 65792 ring-size 1024 int-fd 16
head 0 tail 0 flags 0x0001 interrupts 0
slave-to-master ring 1:
region 0 offset 98688 ring-size 1024 int-fd 17
head 0 tail 0 flags 0x0001 interrupts 0
```
Send ping from VPP to icmpr-epoll:
```
DBGvpp# ping 192.168.1.2
64 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=.1439 ms
64 bytes from 192.168.1.2: icmp_seq=3 ttl=64 time=.2184 ms
64 bytes from 192.168.1.2: icmp_seq=4 ttl=64 time=.1458 ms
64 bytes from 192.168.1.2: icmp_seq=5 ttl=64 time=.1687 ms
Statistics: 5 sent, 4 received, 20% packet loss
```
#### icmp_responder master icmp_responder slave
> This setup creates connection between two applications using libmemif. Traffic functionality is the same as when connection to VPP. App can receive ARP/ICMP request and transmit response.
Run two instances of icmpr-epoll example.
> If not running in container, make sure folder /run/vpp/ exists before creating memif master.
Instance 1 will be in master mode, instance 2 in slave mode.
instance 1:
```
conn 0 1
```
instance 2:
```
conn 0 0
```
In 2 seconds, both instances should print connected! message:
```
INFO: memif connected!
```
Check peer interface names using show command.
|
