[Click] To/From Click devices

[rchertov@purdue.edu]

Quoting Praveen Balasubramanian <praveen_b at mail.utexas.edu>:

> 
> Hello Roman,
> 
> I think the attachments were scrubbed out. Can you upload them to a 

Hmm, my mail reader opened them w/o any issues.  Anyway, I attached a tgz file.

Roman

> Web/FTP server? I think a tar/gzip attachment is also worth a try.
> 
> Thanks a lot,
> Regards,
> Praveen
> 
> ------------------------------
> 
> Message: 6
> Date: Tue, 28 Nov 2006 10:43:55 -0500
> From: rchertov at purdue.edu
> Subject: [Click] To/From Click devices
> To: "click at pdos.csail.mit.edu" <click at pdos.csail.mit.edu>
> Message-ID: <1164728635.456c593b73665 at webmail.purdue.edu>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> 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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> ------------------------------
> 
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> 
> 
> End of click Digest, Vol 41, Issue 24
> *************************************
> 


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