software crypto device:
o record crypto device capabilities in each session id
o add a capability that indicates if the crypto driver operates synchronously
o tag the software crypto driver as operating synchronously
This commit also introduces crypto session id macros that cleanup their
construction and querying.
o add a ``done'' flag for crypto operations; this is set when the operation
completes and is intended for callers to check operations that may complete
``prematurely'' because of direct callbacks
o close a race for operations where the crypto driver returns ERESTART: we
need to hold the q lock to insure the blocked state for the driver and any
driver-private state is consistent; otherwise drivers may take an interrupt
and notify the crypto subsystem that it can unblock the driver but operations
will be left queued and never be processed
o close a race in /dev/crypto where operations can complete before the caller
can sleep waiting for the callback: use a per-session mutex and the new done
flag to handle this
o correct crypto_dispatch's handling of operations where the driver returns
ERESTART: the return value must be zero and not ERESTART, otherwise the
caller may free the crypto request despite it being queued for later handling
(this typically results in a later panic)
o change crypto mutex ``names'' so witness printouts and the like are more
meaningful
should be done in crypto_done rather than in the callback thread
o use this flag to mark operations from /dev/crypto since the callback
routine just does a wakeup; this eliminates the last unneeded ctx switch
o change CRYPTO_F_NODELAY to CRYPTO_F_BATCH with an inverted meaning
so "0" becomes the default/desired setting (needed for user-mode
compatibility with openbsd)
o change crypto_dispatch to honor CRYPTO_F_BATCH instead of always
dispatching immediately
o remove uses of CRYPTO_F_NODELAY
o define COP_F_BATCH for ops submitted through /dev/crypto and pass
this on to the op that is submitted
Similar changes and more eventually coming for asymmetric ops.
MFC if re gives approval.
cryptodev or kldunload cryptodev module); crypto statistcs; remove
unused alloctype field from crypto op to offset addition of the
performance time stamp
Supported by: Vernier Networks
a consistent interface to h/w and s/w crypto algorithms for use by the
kernel and (for h/w at least) by user-mode apps. Access for user-level
code is through a /dev/crypto device that'll eventually be used by openssl
to (potentially) accelerate many applications. Coming soon is an IPsec
that makes use of this service to accelerate ESP, AH, and IPCOMP protocols.
Included here is the "core" crypto support, /dev/crypto driver, various
crypto algorithms that are not already present in the KAME crypto area,
and support routines used by crypto device drivers.
Obtained from: openbsd
