# Dragonet installation #

How to install and use the Dragonet network stack.

*DISCLAIMER*:
In our setup, we boot the machines using an Ubuntu live CD and use the
procedure described below to setup Dragonet.  Our installation scripts heavily
(and sometimes liberally) use `sudo` and have not been tested in different
environments than ours. We strongly suggest not running them in production
machines and file-systems with useful data.

In our setup we typically run the Dragonet on the server side, and use the
Linux network stack for the clients.


## Server installation ##

System Requirements:
 - OS: Linux x86_64 system with kernel version 3.13 (later versions might work,
   but we have not tested them)
 - All the instructions here assume Ubuntu based system.
   We have tested them on Ubuntu-14.04 system in our internal setup.

Hardware requirements:
 - Dragonet supports two 10GbE NICs:
   - Intel i82599
   - Solarflare SFC9020

### Dragonet Code ###

First, you will need the Dragonet source code. The way we typically set it up is
by creating a directory for Dragonet and checking out the code there.

For example:

::

 mkdir /opt/dragonet
 cd /opt/dragonet
 git clone $GIT_URL dragonet

Dragonet has multiple dependencies (ubuntu packets and Haskell cabal libraries
for the most part). We provide the `install_helpers/prepare-machine-gen.sh`
script to help install all the necessary dependencies.

First, you need to set some variables in the script. If we assume that you use
`/opt/dragonet` as described above, you need to set `DRAGONET_BASE` to
`/opt/dragonet`.

You can either directly execute the script or use it as a reference for the
necessary steps.

Dragonet has a number of drivers for the NIC:
 - dpdk :
 - sf   :
 - tap  :
 - e10k :
 - null :

### Installing Z3 ###

We use the Z3 SAT solver (http://z3.codeplex.com/) in Dragonet. Hence, you will
have to download and install it.  We are using
`z3-4.3.2.24961dc5f166-x64-ubuntu-13.10` in our setup, which can be downloaded
from following location: http://z3.codeplex.com/downloads/get/882800 Other
versions of Z3 might also work, but we have not tested them.

Make sure that the `Z3LOCATION` variable in the `prepare-machine-gen.sh` script
is points to the Z3 directory.

### Installing server dependencies ###

Once you have Z3 and the dragonet codebase copied, you can install the
serverside dependencies with following command:

```
./dragonet/install_helpers/prepare-machine-gen.sh -s
```

The above command will :
 * Install necessary ubuntu packets
 * Install `cabal-install` in `$DRAGONET_BASE/dragonet-cabal`
 * Create a cabal sandbox (typically in `$DRAGONET_BASE/dragonet/Dragonet`) and
   install the necessary packages there
 * Create a symbolic link of `Z3LOCATION` in the top-level directory of the
   Dragonet source code (typically `$DRAGONET_BASE/dragonet/z3`).

The `cabal` command mentioned in the next steps refers to the one residing in
`$DRAGONET_BASE/dragonet-cabal/bin/cabal` so you will need to update your
`$PATH` or call it explicitly.

At this point you should be able to build basic Dragonet utilities, i.e., the
ones that do not depend on specific drivers. For example you can build the
Dragonet stack on top of a Linux TAP driver:

::

 $ cd ${DRAGONET_BASE}/dragonet/Dragonet
 $ cabal build stack-tap


### Installing DPDK and OnLoad Dragonet drivers. ###

For doing more interesting things, however, you will need to build the DPDK (for
the Intel i82599) or the OnLoad Dragonet driver (for the Solarflare SFC9020). We
include (slightly modified) versions for these in our git tree.

Both of these require building kernel modules which require having a local copy
of the kernel source code. We use kernel 3.13 for our tests. Newer versions
might (or might not) work.

You can use `prepare-machine-gen.sh` to install DPDK and OpenOnload, which is
essentially a wrapper for their respective installation scripts.


For the DPDK driver:

```
./dragonet/install_helpers/prepare-machine-gen.sh -d
```

For the OnLoad Driver:

```
./dragonet/install_helpers/prepare-machine-gen.sh -o
```

### Installing Dragonet ###

By now you have installed all the dependencies and tools.  Now you can compile
and install the Dragonet code.  This can be done by following command:

```
./dragonet/install_helpers/prepare-machine-gen.sh -S
```

It will produce:

 - `dragonet/Dragonet/dist/build/stack-dpdk/stack-e10k-base`: A version of the
    Dragonet stack using the E10k card but without linking to the DPDK driver
    (this is mostly for testing)

 - `dragonet/Dragonet/dist/build/stack-dpdk/stack-e10k-dpdk`: Same as above, but
    also including the DPDK driver if it was built.

 - `dragonet/Dragonet/dist/build/stack-sf/stack-sf`: A version of the stack
    using the OpenOnload driver, if the OpenOnload driver was built.

 - `dragonet/Dragonet/dist/build/bench-fancyecho/bench-fancyecho`: A Dragonet
   echo server useed for benchmarking

 - A memcached server for Dragonet (`benchmarking/memcached`)


You can also buld the first using cabal directly. For example:

::
 cd ${DRAGONET_BASE}/dragonet/Dragonet
 ${DRAGONET_BASE}/dragonet-cabal/bin/cabal build stack-e10k-dpdk bench-fancyecho

See `Dragonet.cabal` for more details.


*TODO*: Update documentation below

### Configuring NICs ###

This step is needed to make sure that NIC is configured to be used with
Dragonet network stack.  It involves configuring the NIC itstelf,
and providing information about the NIC to Dragonet.

#### Configuring dpdk ####

The dpdk driver needs you to perform certain steps in order to move
the NIC from Linux kernel driver to dpdk driver.  The
`dragonet/dpdk-1.7.1/README_DRAGONET.rst` file will provide further
information on how to configure the NIC for dpdk.


Essentially, it boils down to running following two commands:


```
cd dragonet/dpdk-1.7.1
sudo ./tools/setup.sh dragonet
./dragonet_bind_ethernet.sh eth7 | tee if_info.txt
```

Here, eth7 is the interface which will be used by Dragonet to send
and receive the packets.

Make sure that you copy down the IP address and the MAC address
of the interface you want to use.   All these values are available in
the output of `dragonet_bind_ethernet.sh` command.
From this point onwards the eth7 interface will be invisible to the linux
network stack, and will be only available to the dpdk stack.

##### Providing information to Dragonet #####

Currently Dragonet has hardcoded values for MAC address
and the IP address to be used for the NIC interface.  You need to
edit couple of defines in the file
`dragonet/Dragonet/c_impl/dpdkDrv/packetRxTx.c` with values based on
your interface.  Note that the values are in network order, so edit them
accordingly.  The examples in the code should help you with it.
 - `CONFIG_LOCAL_MAC`
 - `CONFIG_LOCAL_IP`

You also need to modify the value of server IP address for Intel NIC in file
`dragonet/Dragonet/Scenarios/S3.hs`.  The variable holding the value
of Intel NIC IP address is `asiagoIntel_server`.

Once the modifications are done, you need to recompile the stack with
following command:

```
cd dragonet/Dragonet
cabal clean
cabal build stack-dpdk
```



#### Configuring onload ####

Configuring onload to use with Dragonet is relatively easy.  Just make sure
that you have compiled and installed all the required tools with
`prepare-machine-gen.sh -o` option (should have been done as part of
the "Installing dpdk and onload driver").

After above installation you will notice that the name of interface is
changed from "ethX" to something of a format "pXXXpX" (eg: "p786p1").
You may have to reconfigure the interface as the old IP configuration
might have been lost after this step.

The onload driver works in collaboration with Linux kernel network stack,
hence you will see the device to be present in Linux network stack as well
when you are using onload and Dragonet.


##### Providing information to Dragonet #####

Currently Dragonet has hardcoded values for interface name, MAC address
and the IP address to be used for the NIC interface.  You need to
edit folowing defines in a file
`dragonet/Dragonet/c_impl/onloadDrv/efvi_sfw.h` with values based on
your interface.  Note that the values are in network order, so edit them
accordingly.  The examples in the code should help you with it.
 - `IFNAME`
 - `CONFIG_LOCAL_MAC_sf`
 - `CONFIG_LOCAL_IP_sf`

You also need to modify the value of server IP address for SF NIC in file
`dragonet/Dragonet/Scenarios/S3.hs`.  The variable holding the value
of Solarflare NIC IP address is `asiagoSF_server`.

Once the modifications are done, you need to recompile the stack with
following command:

```
cd dragonet/Dragonet
cabal clean
cabal build stack-sf
```


#### Providing information about client machines ####

Few of the Dragonet usecases needs information about the IP addresses
of the client machines which will be used for the load generation.
This is specifically needed for the priority workload where Dragonet
needs to know about which clients are high priority and which clients
are low priority.  This list of client IP addresses is in the file
`dragonet/Dragonet/Scenarios/S3.hs` and is maintained in a variable
named `getClientList_real`.   We tend to keep this list sorted based
on which clients are high priority and which are low priority.

It is fine if you miss some clients in this list,
if they are low priority, but Dragonet needs to know about high priority
clients.

Another location where you will need to provide information about the
high priority client is in the `dragonet/Dragonet/Scenarios/S1.hs` file.
Essentially you need to replace the current high priority clients
("10.113.4.57" and "10.113.4.51") with your own pair of high priority clients.

You need to rebuild the stacks after modifying information about priority
clients.  Here is a command which will rebuild everything needed:

```
cd dragonet/Dragonet
cabal build bench-fancyecho stack-sf stack-e10k
```

## Running Dragonet stack ##

Once the dragonet stack is compiled, it can be deployed with following
helper script.

For dpdk stack (on Intel 82599 NIC):
```
cd dragonet/Dragonet
./scripts/pravin/deployDragonetGen.sh fg dpdk 4 balance
```

For sf stack (on solarflare SFC9020 NIC):
```
cd dragonet/Dragonet
./scripts/pravin/deployDragonetGen.sh fg sf 4 balance
```

### Verifying that Dragonet is running properly ###

The easiest way to verify that if the dragonet stack is
running properly or not is to ping it from a remote machine.

Here is a typical ping before running the Dragonet stack.
```
ubuntu@ziger2:~$ sudo ping 10.113.4.195
PING 10.113.4.195 (10.113.4.195) 56(84) bytes of data.
64 bytes from 10.113.4.195: icmp_seq=1 ttl=64 time=0.244 ms
64 bytes from 10.113.4.195: icmp_seq=2 ttl=64 time=0.136 ms
64 bytes from 10.113.4.195: icmp_seq=3 ttl=64 time=0.127 ms
64 bytes from 10.113.4.195: icmp_seq=4 ttl=64 time=0.138 ms
^C
--- 10.113.4.195 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2997ms
rtt min/avg/max/mdev = 0.127/0.161/0.244/0.048 ms
```

Note that the TTL values are 64 here (default for Linux network stack).
Following is the ping output when Dragonet stack was controlling the
same interface on server:

```
ubuntu@ziger2:~$ sudo ping -c 5 10.113.4.195
PING 10.113.4.195 (10.113.4.195) 56(84) bytes of data.
64 bytes from 10.113.4.195: icmp_seq=1 ttl=17 time=0.057 ms
64 bytes from 10.113.4.195: icmp_seq=2 ttl=17 time=0.044 ms
64 bytes from 10.113.4.195: icmp_seq=3 ttl=17 time=0.048 ms
64 bytes from 10.113.4.195: icmp_seq=4 ttl=17 time=0.042 ms
64 bytes from 10.113.4.195: icmp_seq=5 ttl=17 time=0.045 ms

--- 10.113.4.195 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.042/0.047/0.057/0.006 ms
```

Note that the the TTL values here are 17 instead of 64.  This is
because Dragonet stack is programmed to return 17 as TTL value
so that any packet sent out by Dragonet can be distinguished easily.

If you don't see this TTL value, then you can assume that something
is wrong on the server-side deployment, or that you are pinging the
wrong interface.



## Client installation ##

On client side, installation is little simpler.  You just need to get
the copy of the code.  We have copied the instructions from
server installation section about getting the code here.

### Copy of the code ###

You need to copy the whole "dragonet" repository in both server and client
machines.  We propose that you clone or copy the repository directly into
the home directory of the user which will be used for running servers and
clients.  This user is assumed to have sudo access.  In our setup, we
are using a user "ubuntu" and the code repository is located at
"${HOME}/dragonet".  We recommend using this type of the path for keeping
the copy of the dragonet.

In case your path is different, you need to edit "MYBASE" variable in the
`prepare-machine-gen.sh`  script.


### Installing the client side ###

The client side can be installed with following command:



To make sure that your installation is correct and that your clients will
use correct load-generator tools,  just run memaslap command and make sure
that `-z` or `--sports` commandline option is shown:

```
$ memaslap

    -z, --sports=
            Starting port to be used by client connections. Defualt 0, means pick any

```

# Running the benchmarks #

Once you have installed everything on both server and client side,
and verified that Dragonet stack is working with pings, then you can
use the scripts available in `dragonet/benchmarking/netperf-wrapper/` for
running the benchmarks.  These are the harness scripts which are to be
run from the separate controller machine and these scripts can
 - Connect to the server machine, start dragonet stack, start the application
 - Connect to the client machines, start the load generators
 - Collect all the results, store them in json format for later plotting
 - Cleanup the server and clients

You will find more information about how-to run the benchmarks in
`dragonet/benchmarking/netperf-wrapper/README_DRAGONET.rst` file.