tree 771e55e3cd5391b1258bef1b8c66f4db32b91b34
parent 8f53d6310bd166670b123b982c38b32e8a3a877b
author Andrew Jeffery <andrew@aj.id.au> 1659707177 +0930
committer Andrew Jeffery <andrew@aj.id.au> 1659942060 +0000

astlpc: Implement async support via buffer state tracking

To remove the unbounded loop in mctp_astlpc_kcs_send() we need the
capability to retry sending the pending command once the data value has
been consumed. However, the link is duplex and we may enter the state
where we have multiple pending commands.

Rather than explicitly track the set of pending commands, track the
buffer state in order to derive both the pollfd state needed by the
caller _and_ the pending buffer synchronisation commands.

Unfortunately due to the structure of the code the integration of the
state tracking is a little messy, but is capable of correctly booting a
P10 system.

I've put up a less constrained and perhaps aspirational implementation
of how the state tracking could be implemented if we feel the need to
rework things going forward:

https://github.com/amboar/libmctp-shmb/

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I693946dae5336aa5d0f07bcd66c36f1ccd391054