Introduction
------------
The DNA driver allows you bypass the kernel and let your applications manipulate the card directly.
This means that as soon as you have installed this driver, only DNA-aware applications will be 
able to play with the card. 

Prerequisites
-------------

We support DNA on modern kernels that have full multi-queue support. Please use
kernel 2.6.26 or newer (we suggest 2.6.32 or better). No support will be offered
on older kernels.


Compilation and Installation
----------------------------
1. compile PF_RING
- untar the PF_RING distribution on your home directory (e.g. ~/PF_RING)
- cd PF_RING
- make

2. compile the DNA driver. Example for ixgbe do:
- cd ./ixgbe/ixgbe-3.3.9-DNA/src/
- make

3. load PF_RING and the DNA driver
- (as root) run ./load_dna_driver.sh

Note that

- you might need to change the interface names into your script

- you can decide which adapters to enable as follows

  insmod ./ixgbe.ko adapters_to_enable=<MAC addresses>

  where adapters_to_enable contains the comma-separated list of adapters to enable with DNA

- you can change the default number of rx/tx slots as follows

  insmod ./ixgbe.ko num_rx_slots=8192 num_tx_slots=4096

- you can change the MTU as follows

  insmod ./ixgbe.ko mtu=9000

- you can set the coreId of the numa node where memory has to be allocated as follows

  insmod ./ixgbe.ko numa_cpu_affinity=0,0,0,0

Testing DNA
-----------
Supposing that you have cross-connected the DNA interfaces dnaX and dnaY, you can send packet 
on one interface and receive them from the other. Example

[Sender]
# cd ~/PF_RING/userland/examples/
# sudo ./pfsend -i dnaX -n 0

[Receiver]
# cd ~/PF_RING/userland/examples/
# sudo ./pfcount -i dnaY
(optionally you can add '-a' for maximum performance)

---------------------------------------
September 2011 - Luca Deri <deri@ntop.org>