designs/mctp/mctp-kernel.md

18   network with a single local endpoint id (EID).
55 allow very simple endpoints, with static EID allocations, to run without this
57 functionality (bus owners, bridges, etc), and/or dynamic EID allocation, would
135     /* MCTP EID values */
199 destination EID.
234 The `smctp_addr` field specifies a remote EID. This may be the `MCTP_ADDR_BCAST`
235 the MCTP broadcast EID (0xff).
281 generate a tag value suitable for the destination EID. If `MCTP_TAG_OWNER` is
314 any previous allocation has been performed (to for a different remote EID), that
342     printf("received %zd bytes from remote EID %d\n", rc, addr.smctp_addr);
416 allocations when a message is sent to a new destination EID. This causes the
449 - **requester**: sends requests to a particular (EID, type) target, and receives
460   messages, manage EID allocations, update local MCTP stack state. Will need
559                     printf("%zd bytes from EID %d\n", rc, addr.smctp_addr);
579 Sends a request to a broadcast EID, and receives (unicast) replies. Typical
648                     printf("response from EID %d\n", rxaddr.smctp_addr);
663 The `smctp_addr` field maps directly to the destination endpoint's EID.
674 In particular, the destination EID is never used to select a destination
677 MCTP responders should use the EID and network values of an incoming request to
686 forwarded if their destination EID is non-local, and matches a route for another
697 EID, source EID, tag-owner, tag) tuple. The tag value is 3 bits in size.
701 that specific remote EID.
706 - a new message is sent to a new destination EID
730 is transmitted with TO=1 and dest=0xff (the broadcast EID), the kernel must
744 Aside from the "Resolve endpoint EID" message, the MCTP control protocol
747 EID allocations (for bus owner devices) and maintaining the MCTP route table
762 | EID range | interface | physical address | metric | MTU | flags | expiry |
777 - physical-to-EID mappings discovered through received packets
781 When a packet is to be transmitted to an EID that does not have an entry in the
816 ### `mctp address`: manage local EID assignments