Date: Wed, 25 Jul 2007 11:02:48 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Subject: Removing NET_NEEDS_GIANT: first patch Message-ID: <20070725110221.C83919@fledge.watson.org>
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--0-894572789-1185272265=:83919
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Content-ID: <20070725110221.W83919@fledge.watson.org>
(Resent spelling current@FreeBSD.org correctly)
Dear all,
Per many discussions over the past few years, we've finally reached the end of
the road on non-MPSAFE network protocol components. Recently, Bjoern, George,
and I resolved, in various ways, the last few remaining protocol-layer
dependencies (IPSEC, i4b, IPX over IP, netatm), and there are now no
Giant-dependent protocol components left. This is the result of a lot of
hardware work by a great many FreeBSD developers over the past six years, and I
really appreciate everyone's hard work to make this possible!
Attached is the first of a series of patches to start removing the
NET_NEEDS_GIANT and debug.mpsafenet scaffolding. This source code declaration
was used by optionally compiled components to declare a strict requirement for
Giant, and forced Giant over the entire network stack. debug.mpsafenet could
also be set by users in loader.conf in order to similar force Giant over the
network stack, and existed for two reasons: to allow Giant to be put back over
the network stack for debugging purposes, and to support these recently removed
or fixed unsafe components. As such, this patch removes the following:
- NET_NEEDS_GIANT() macro
- debug.mpsafenet tunable/sysctl and associated debug_mpsafenet variable, as
well as functions supporting these.
- Use of this variable to control acqusition of Giant in network-related
interrupt handlers and various other paths.
If also converts the following to no-ops, allowing them to be gradually removed
in a series of follow-up patches to minimize risk and disruption:
- NET_LOCK_GIANT(), NET_UNLOCK_GIANT()
- NET_ASSERT_GIANT()
Finally, the following conversion takes place:
- NET_CALLOUT_MPSAFE is now an alias for CALLOUT_MPSAFE
The patch is attached, and I would appreciate feedback on the patch and any
testing. Assuming no serious negative feedback in the next couple of days,
I'll request permission to commit from re@. The patches that follow will:
- Replace all remaining NET_CALLOUT_MPSAFE instances with CALLOUT_MPSAFE,
removing NET_CALLOUT_MPSAFE.
- Removing all references to NET_{LOCK,UNLOCK,ASSERT}_GIANT.
- Clean up some other weird Giant-related compatibility in the Cronyx drivers.
Things this patch doesn't do:
- Address the WITNESS lock order warnings generated when credential rules are
used with ipfw/pf. These are believed to be annoying but non-harmful, as
deadlocks are no longer reported. This view may be revised if evidence to
the contrary is presented.
- Remove IFF_NEEDSGIANT, a similar set of Giant-acquiring shims used to
protect non-MPSAFE device drivers. I had hoped to remove this in 7.0, but I
think this will happen instead for 8.0 due to remaining non-MPSAFEty in a
few key network device drivers.
Patch attached, and also available at this URL:
http://www.watson.org/~robert/freebsd/netperf/20070724-no_net_needs_giant_1.diff
Robert N M Watson
Computer Laboratory
University of Cambridge
--0-894572789-1185272265=:83919
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Content-Disposition: ATTACHMENT; FILENAME=20070724-no_net_needs_giant_1.diff
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