[Click] To/From Click devices

[rchertov@purdue.edu]

Hello,
   There was a request to take a look at my char device drivers I made for
user-Click interaction.

Build the new elements.
Create the devices
mknod /dev/toclick0 c 240 0
mknod /dev/toclick1 c 240 1
mknod /dev/toclick1 c 240 1
mknod /dev/touser0 c 241 0
mknod /dev/touser1 c 241 1
mknod /dev/touser2 c 241 2
(you can make as few or as many as you want (255 is max))

In the Click config file you use the elements as follows:

FromUser(MINORNUMBER, [SIZE, BURST])-> CheckIPHeader -> Discard;

MINORNUMBER is instance of the device you want to use (0 for /dev/toclick0)
SIZE is the size ring buffer inside of the device.
BURST how many packets to move from the ring buffer into click at once

In a user app you just do this
fd = open("/dev/toclick0", O_WRONLY);
// You write a single pkt at a time.  buff contains a pkt of size buff_size
// you can't write pkts larger than (1536+16)
write(fd, buff, buff_size);
close(fd);



PollDevice(eth0) -> ToUser(MINORNUMBER, [SIZE]);

MINORNUMBER is instance of the device you want to use (0 for /dev/touser0)
SIZE is the size ring buffer inside of the device.


In user level land you just do 
fd = open("/dev/touser0", O_RDONLY);
// you read pkts and not bytes.  The returned value will be in bytes
// Each pkt is a slot of (1536+16). so make buff size a multiple of this number
read(fd, buff, 2);  
close(fd);


If you have any questions please let me know.

Roman
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