K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-01-24T20:14:57.899354Z
K 7
svn:log
V 699
Expand the software fallback for GCM to cover more cases.

- Extend ccr_gcm_soft() to handle requests with a non-empty payload.
  While here, switch to allocating the GMAC context instead of placing
  it on the stack since it is over 1KB in size.
- Allow ccr_gcm() to return a special error value (EMSGSIZE) which
  triggers a fallback to ccr_gcm_soft().  Move the existing empty
  payload check into ccr_gcm() and change a few other cases
  (e.g. large AAD) to fallback to software via EMSGSIZE as well.
- Add a new 'sw_fallback' stat to count the number of requests
  processed via the software fallback.

Submitted by:	Harsh Jain @ Chelsio (original version)
Sponsored by:	Chelsio Communications

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