[openib-general] What context can CM be called from?

[Tziporet Koren]

Hi,

If I remember correctly the verbs of create & destroy AVs should be enabled
from interrupt context too since they are not privileged verbs. In VAPI we
implemented these verbs in this way and I think it is important to keep it
this way.

So my vote is to fix the core. Is there any limitation for the
implementation in gen2 that prevent this?

Tziporet

-----Original Message-----
From: Roland Dreier [mailto:roland at topspin.com]
Sent: Tuesday, March 29, 2005 2:31 AM
To: Sean Hefty
Cc: openib-general at openib.org
Subject: Re: [openib-general] What context can CM be called from?


    Sean> We might be able to change the CM to be called at interrupt,
    Sean> but doing so requires changes to the verbs implementation.
    Sean> The cm_alloc_msg() calls ib_create_ah(), which I believes
    Sean> calls kmalloc in a similar fashion.  I should also note that
    Sean> cm_free_msg() calls ib_destroy_ah().

Yep good point.  A particular implementation of ib_create_ah() may be
safe from interrupt context but in general ib_create_ah() needs to be
allowed to sleep.

So I guess you've got your marching orders, Libor...

 - R.
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