[openib-general] cm-id->context should be NULL forIB_CM_REQ_RECEIVED ?

[James Lentini]

On Mon, 13 Jun 2005, Jeff Carr wrote:

> On 06/13/05 14:56, Fab Tillier wrote:
>>> From: Jeff Carr [mailto:jcarr at linuxmachines.com]
>>> Sent: Monday, June 13, 2005 2:52 PM
>>> 
>>> On 06/13/05 14:12, Roland Dreier wrote:
>>> 
>>>>    Jeff> On the recieving end of a request, when the handler gets
>>>>    Jeff> called and the cm-id gets passed to your handler (aka when
>>>>    Jeff> the handler gets IB_CM_REQ_RECEIVED) it seems cm-id->context
>>>>    Jeff> isn't null. Is there some useful data in there? If not, I
>>>>    Jeff> think it makes more sense (and makes code easier to write to
>>>>    Jeff> use the cm handler) if the context is set to NULL.
>>>> 
>>>> I think the context gets populated from the context of the
>>>> corresponding cm_id that was passed to ib_cm_listen().
>>> 
>>> OK, thanks. I checked and it does look like that is what is happening.
>>> I'll set the context for the cm_id I pass into ib_cm_listen to null.
>>> Assuming of course, that the cm_id context for that one doesn't matter.
>> 
>> 
>> The CM doesn't interpret the user's context ever.  It is just there for the
>> benefit of the user.  If your app doesn't need the context in the REQ 
>> callback,
>> then you can set it to NULL.
>> 
>> Out of curiosity, if you don't set the listen's context, how do you figure 
>> out
>> which listen received the callback?  Does DAPL not care?

I don't believe Jeff is using DAPL.

>
> I only call ib_cm_listen once:
>
> ib_cm_listen(listen_id, LISTEN_NUM, 0);
>
> Is it necessary to call listen for each connection I wish to recieve? It 
> seems like the cm handler function I register when I create the cm_id 
> continues to handle req events until it is destroyed so I'm assuming this is 
> all I need.
>
> In the case where I only have one number I'm listening on, then it doesn't 
> matter to me what the context is; NULL makes the code simple.
>
> Jeff
> _______________________________________________
> openib-general mailing list
> openib-general at openib.org
> http://openib.org/mailman/listinfo/openib-general
>
> To unsubscribe, please visit 
> http://openib.org/mailman/listinfo/openib-general
>