K 10
svn:author
V 3
sam
K 8
svn:date
V 27
2002-12-17T18:15:06.000000Z
K 7
svn:log
V 1281
Revise processing of crypto ops for better performance.  Rather than context
switch to a kernel thread to dispatch each request use a software interrupt
to invoke the dispatching logic.  Also, and almost as important, decouple
callbacks done when ops complete from the dispatch thread.  These are done
in a kernel thread (as opposed to a swi context) so that clients of the crypto
system don't need to be concerned with blocking crypto-related interrupts.

Specific changes:

o splimp's -> splcrypto's because entry to the crypto code can come at
  splsoftcrypto now
o add system-wide statistics for the crypto system
o add timing statistics for crypto ops as they pass through the system to
  help in analyzing performance; these are conditionally compiled in under
  CRYPTO_TIMING and enabled with a debug.crypto_timing sysctl
o purge an unused entry from the cryptop data structure
o change some wakeup's to wakeup_one since we know there's only one proc waiting
o check error return from crypto_invoke in /dev/crypto support
o bzero zalloc'd data in crypto_getreq (missed in previous MFC)

Note: these changes are not relevant to -current because swi's are implemented
      with kthreads.
Sponsored by:	Vernier Networks
Inspired by:	Jonathan Stone <jonathan@DSG.Stanford.EDU>

END