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Date: Tue, 5 Sep 2017 16:53:23 +0530
From: Harsh Jain <harshjain.prof@...il.com>
To: Gilad Ben-Yossef <gilad@...yossef.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Jonathan Corbet <corbet@....net>,
David Howells <dhowells@...hat.com>,
Tom Lendacky <thomas.lendacky@....com>,
Gary Hook <gary.hook@....com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Arnaud Ebalard <arno@...isbad.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Alasdair Kergon <agk@...hat.com>,
Mike Snitzer <snitzer@...hat.com>,
device-mapper development <dm-devel@...hat.com>,
Shaohua Li <shli@...nel.org>, Steve French <sfrench@...ba.org>,
"Theodore Y. Ts'o" <tytso@....edu>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Mimi Zohar <zohar@...ux.vnet.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
James Morris <james.l.morris@...cle.com>,
"Serge E. Hallyn" <serge@...lyn.com>,
Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
linux-doc@...r.kernel.org,
Linux kernel mailing list <linux-kernel@...r.kernel.org>,
keyrings@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-raid@...r.kernel.org,
linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
linux-fscrypt@...r.kernel.org,
linux-ima-devel@...ts.sourceforge.net,
linux-ima-user@...ts.sourceforge.net,
linux-security-module@...r.kernel.org,
Ofir Drang <ofir.drang@....com>
Subject: Re: [PATCH v7 00/19] simplify crypto wait for async op
On Sun, Sep 3, 2017 at 11:47 AM, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> On Thu, Aug 31, 2017 at 3:31 PM, Harsh Jain <harshjain.prof@...il.com> wrote:
>> 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.
>
> Good catch. You are right and the same holds true for ah_output() in ah4.c.
>
> But I do wonder, the code there now treats -EBUSY as a special case
> and returns NET_XMIT_DROP
> but if an AEAD or AHASH transformation return some other error, like
> -ENOMEM or -EINVAL shouldn't
> we return NET_XMIT_DROP in that case too?
I think we should not, XMIT_DROP implies drop current packet only,
later on when device is recovered from busy state, Upper layer
protocol(TCP) will re-transmit the packet. It helps in flow control.
>
> Any ideas?
>
> Gilad
>
>>
>>
>> On Thu, Aug 24, 2017 at 7:48 PM, Gilad Ben-Yossef <gilad@...yossef.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
>>>
>
>
>
> --
> Gilad Ben-Yossef
> Chief Coffee Drinker
>
> "If you take a class in large-scale robotics, can you end up in a
> situation where the homework eats your dog?"
> -- Jean-Baptiste Queru
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