Hello all, We already had a discussion about the J1939 use case for server implementation. Short description of the challenge will looks as follow: - main socket is listening on DST address and PGN. - as soon as connection was requested from peer the server will create new connect()ed socket with SRC, DST addresses and PGN. With current stack implementation both sockets (main and connected) will receive same packages. At least with huge packages it will start to be not really good :). To solve this issue we have following variants: variant a: - all sockets can receive everything (as currently implemented) variant b: - only one socket will receive specific tuple. In this case kernel should calculate RX "priority". Only highest priority will RX packet. - all sockets with same priority will receive the matching packet - socket option promisc == same priority as exact match variant c: - all sockets can receive everything add socket option: "ignore me if other can rx" We think variant b makes most sense to us. Opinions? regards, Oleksij & Marc -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
