netdev - Re: [PATCH][XFRM] export SAD info

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Message-Id: <1177593010.4077.18.camel@localhost>
Date:	Thu, 26 Apr 2007 09:10:10 -0400
From:	jamal <hadi@...erus.ca>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH][XFRM] export SAD info

On Thu, 2007-26-04 at 00:18 -0700, David Miller wrote:
> From: jamal <hadi@...erus.ca>

> > Would it make sense to have those vars as u32 instead of unsigned int?
> 
> I'm ambivalent, "unsigned int" happens to be 32-bit on every platform.
> So changing it would cause no harm :-)

If unsigned int is always u32 i will leave it as is.

I would have liked to just do a read_lock_bh when retrieving the table
metadata; however, the state table lock is defined as DEFINE_SPINLOCK
unlike the policy table which is defined as DEFINE_RWLOCK.
Any objection to change the state lock to be RW?

BTW, if i can get the SADinfo, then i should be able to set it from user
space too;->
So that would be my next change unless there is objection.

One other angle is start rejecting additions to the table after some
point. To test, I wrote a little DOS tool that just kept adding entries
until an OOM hit. It is a lot of fun to watch when you hit a point that
swap is guzzling 2G or more. The add latency starts going up
exponentially.
I would like to enable the admin to set the proper param settings for
upper bound. Exceeding the upper bounds of the max entries a table
should have returns ENOMEM for any new entries. By default current
behavior is maintained.

Thoughts?

cheers,
jamal

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