On 09.05.21 13:28, Erik Flodin wrote:
On Thu, 6 May 2021 at 07:26, Oliver Hartkopp <socketcan@xxxxxxxxxxxx> wrote:
From what I understood your main requirement is to double check the
outgoing traffic whether is has been sent.
What I would like to have is:
1. Be notified when a frame has been sent. I send (from user space) a
single frame and wait until I get confirmation before sending the next
to give other nodes on the bus a slot to start sending, even if their
frames have ID with lower priority.
o_O
Sorry, but I have problems to get behind your use-case.
1. You are sending a frame
2. You get a confirmation
3. You are waiting some time (which is not written above), to give other
nodes a slot??
No explicit sleep is needed. The machine is sufficient slow so that
just waiting for the confirmation before sending the next frame is
enough. But if the frames are queued in the socket/device then the
frames are sent back-to-back.
Ok, I feel I'm getting behind your requirement ...
You mainly want to throttle the outgoing traffic, to make sure that e.g.
a specific CAN ID is not sent 'back-to'back' and might lead to a DoS
situation on the wire?!?
Do you know about the Linux CAN queuing disciplines that might provide
the solution to your question?
See:
http://rtime.felk.cvut.cz/can/
http://rtime.felk.cvut.cz/can/socketcan-qdisc-final.pdf
A four-slides-intro to the concept can be found here (slides 41ff):
https://wiki.automotivelinux.org/_media/agl-distro/agl2017-socketcan-print.pdf
Best,
Oliver
4. goto 1??
Yes.
// Erik
