tree b50d4478a39c3fcb19bec1e4014ce54f1aa71055
parent 88cdf7d12a0e4a8377e5ec664bd60a456cbbb5f3
author quang.ampere <quangn@amperecomputing.com> 1666058691 +0700
committer Dung Cao <dung@os.amperecomputing.com> 1666933819 +0000

Fix host ssif driver unable to create /dev/ipmi0 interface

When host boots up, during the ssif enumeration, it will send
request commands to BMC to query for data then bring up the
/dev/ipmi0 interface. The timeout duration to wait for data of
host is 15 seconds, if timeouted, host will send other commands
and continue the enumeration.

During the AC or DC cycle, BMC dbus will be busy with a lot of
traffic which is easy to cause the dbus timeout happened. Ipmid
comunicates with ssifbridge via dbus. When ipmid receive requests,
it puts in a queue and response to those requests one by one.
Because of the dbus timeout, ipmid will send the response late
which cause the mismatch and duplicate responses in the request
of host. Let say, host request command 87, but because of the
timeout, ipmid response with command 66 which may be sent by host
previously. And then, ipmid sends response of command 87.
This leads to 2 or more reponses will be sent to host.

These mismatches and duplicate responses will cause host driver
confused and failed to create ssif interface on host.

Tested:
1. Run AC cycle 200 times, ensure that ipmi in-band commands
   still work
2. Run DC cycle 400 times, ensure that ipmi in-band commands
   still work

Signed-off-by: quang.ampere <quangn@amperecomputing.com>
Change-Id: Ie08a6dd376a1460b3e63c7ecb3908ac886c521b0