netdev - Re: [openib-general] [PATCH v4 01/13] Linux RDMA Core Changes

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Date:	Wed, 03 Jan 2007 15:22:00 -0600
From:	Steve Wise <swise@...ngridcomputing.com>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	netdev@...r.kernel.org, Roland Dreier <rdreier@...co.com>,
	linux-kernel@...r.kernel.org, openib-general@...nib.org
Subject: Re: [openib-general] [PATCH  v4 01/13] Linux RDMA Core Changes

> > 
> > So what does this tell you?
> > To me it looks like there's a measurable speed difference,
> > and so we should find a way (e.g. what I proposed) to enable chelsio userspace
> > without adding overhead to other low level drivers or indeed chelsio kernel level code.
> > 
> > What do you think? Roland?
> > 
> 
> I think having a 2nd function to set the udata seems onerous.
> 
> 

Roland, 

If you think I should not add the udata parameter to the req_notify_cq()
provider verb, then I can rework the chelsio driver:

1) at cq creation time, pass the virtual address of the u32 used by the
library to track the current cq index.  That way the chelsio kernel
driver can save the address in its kernel cq context for later use.

2) change chelsio's req_notify_cq() to copy in the current cq index
value directly for rearming.

This puts all the burden on the chelsio driver, which is apparently the
only one that needs this functionality.  

Lemme know.

Steve.

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