[openib-general] cm_id state information

[James Lentini]

Sean,

Is there documentation or a piece of sample code that shows how to 
interact with the CM correctly?

james

On Thu, 5 May 2005, Sean Hefty wrote:

> This came up on a separate thread...
>
> Currently the cm_id structured defined in ib_cm.h exposes a state field. This 
> (and a couple of other fields) were originally exposed only for debug 
> purposes, but I've noticed that both kDAPL and SDP access this field.
>
> The issue is that access to the cm_id state must be protected by a lock in 
> order to guarantee correct operation of the CM state machine.  Because CM 
> messages can be received at any time, the cm_id state could change if it is 
> accessed outside of the locks.
>
> While in a CM callback, the reported event should be used to determine the 
> correct operation to take, rather than reading the cm_id state.  I will try 
> to work up some patches to correct this.
>
> I will at the very least add comment to ib_cm.h about using these fields, or 
> move them into the internal CM data structures.
>
> - Sean
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