[PATCH v7 00/19] simplify crypto wait for async op

[Harsh Jain]

HI Gilad,

I think we need an update in ESP also. Now EBUSY return means driver
has accepted, Packet should not be dropped in

esp_output_tail() function.

.

Regards
Harsh Jain



On Thu, Aug 24, 2017 at 7:48 PM, Gilad Ben-Yossef <gilad at benyossef.com> wrote:
> Many users of kernel async. crypto services have a pattern of
> starting an async. crypto op and than using a completion
> to wait for it to end.
>
> This patch set simplifies this common use case in two ways:
>
> First, by separating the return codes of the case where a
> request is queued to a backlog due to the provider being
> busy (-EBUSY) from the case the request has failed due
> to the provider being busy and backlogging is not enabled
> (-EAGAIN).
>
> Next, this change is than built on to create a generic API
> to wait for a async. crypto operation to complete.
>
> The end result is a smaller code base and an API that is
> easier to use and more difficult to get wrong.
>
> The patch set was boot tested on x86_64 and arm64 which
> at the very least tests the crypto users via testmgr and
> tcrypt but I do note that I do not have access to some
> of the HW whose drivers are modified nor do I claim I was
> able to test all of the corner cases.
>
> The patch set is based upon linux-next release tagged
> next-20170824.
>
> Changes from v6:
> - Fix brown paper bag compile error on marvell/cesa
>   code.
>
> Changes from v5:
> - Remove redundant new line as spotted by Jonathan
>   Cameron.
> - Reworded dm-verity change commit message to better
>   clarify potential issue averted by change as
>   pointed out by Mikulas Patocka.
>
> Changes from v4:
> - Rebase on top of latest algif changes from Stephan
>   Mueller.
> - Fix typo in ccp patch title.
>
> Changes from v3:
> - Instead of changing the return code to indicate
>   backlog queueing, change the return code to indicate
>   transient busy state, as suggested by Herbert Xu.
>
> Changes from v2:
> - Patch title changed from "introduce crypto wait for
>   async op" to better reflect the current state.
> - Rebase on top of latest linux-next.
> - Add a new return code of -EIOCBQUEUED for backlog
>   queueing, as suggested by Herbert Xu.
> - Transform more users to the new API.
> - Update the drbg change to account for new init as
>   indicated by Stephan Muller.
>
> Changes from v1:
> - Address review comments from Eric Biggers.
> - Separated out bug fixes of existing code and rebase
>   on top of that patch set.
> - Rename 'ecr' to 'wait' in fscrypto code.
> - Split patch introducing the new API from the change
>   moving over the algif code which it originated from
>   to the new API.
> - Inline crypto_wait_req().
> - Some code indentation fixes.
>
> Gilad Ben-Yossef (19):
>   crypto: change transient busy return code to -EAGAIN
>   crypto: ccp: use -EAGAIN for transient busy indication
>   crypto: remove redundant backlog checks on EBUSY
>   crypto: marvell/cesa: remove redundant backlog checks on EBUSY
>   crypto: introduce crypto wait for async op
>   crypto: move algif to generic async completion
>   crypto: move pub key to generic async completion
>   crypto: move drbg to generic async completion
>   crypto: move gcm to generic async completion
>   crypto: move testmgr to generic async completion
>   fscrypt: move to generic async completion
>   dm: move dm-verity to generic async completion
>   cifs: move to generic async completion
>   ima: move to generic async completion
>   crypto: tcrypt: move to generic async completion
>   crypto: talitos: move to generic async completion
>   crypto: qce: move to generic async completion
>   crypto: mediatek: move to generic async completion
>   crypto: adapt api sample to use async. op wait
>
>  Documentation/crypto/api-samples.rst |  52 ++-------
>  crypto/af_alg.c                      |  27 -----
>  crypto/ahash.c                       |  12 +--
>  crypto/algapi.c                      |   6 +-
>  crypto/algif_aead.c                  |   8 +-
>  crypto/algif_hash.c                  |  50 +++++----
>  crypto/algif_skcipher.c              |   9 +-
>  crypto/api.c                         |  13 +++
>  crypto/asymmetric_keys/public_key.c  |  28 +----
>  crypto/cryptd.c                      |   4 +-
>  crypto/cts.c                         |   6 +-
>  crypto/drbg.c                        |  36 ++-----
>  crypto/gcm.c                         |  32 ++----
>  crypto/lrw.c                         |   8 +-
>  crypto/rsa-pkcs1pad.c                |  16 +--
>  crypto/tcrypt.c                      |  84 +++++----------
>  crypto/testmgr.c                     | 204 ++++++++++++-----------------------
>  crypto/xts.c                         |   8 +-
>  drivers/crypto/ccp/ccp-crypto-main.c |   8 +-
>  drivers/crypto/ccp/ccp-dev.c         |   7 +-
>  drivers/crypto/marvell/cesa.c        |   3 +-
>  drivers/crypto/marvell/cesa.h        |   2 +-
>  drivers/crypto/mediatek/mtk-aes.c    |  31 +-----
>  drivers/crypto/qce/sha.c             |  30 +-----
>  drivers/crypto/talitos.c             |  38 +------
>  drivers/md/dm-verity-target.c        |  81 ++++----------
>  drivers/md/dm-verity.h               |   5 -
>  fs/cifs/smb2ops.c                    |  30 +-----
>  fs/crypto/crypto.c                   |  28 +----
>  fs/crypto/fname.c                    |  36 ++-----
>  fs/crypto/fscrypt_private.h          |  10 --
>  fs/crypto/keyinfo.c                  |  21 +---
>  include/crypto/drbg.h                |   3 +-
>  include/crypto/if_alg.h              |  15 +--
>  include/linux/crypto.h               |  40 +++++++
>  security/integrity/ima/ima_crypto.c  |  56 +++-------
>  36 files changed, 310 insertions(+), 737 deletions(-)
>
> --
> 2.1.4
>