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From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Tue, 5 Sep 2017 15:16:57 +0300
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Subject: Re: [PATCH v7 00/19] simplify crypto wait for async op
To: Harsh Jain <harshjain.prof@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Jonathan Corbet <corbet@lwn.net>, David Howells <dhowells@redhat.com>,
        Tom Lendacky <thomas.lendacky@amd.com>, Gary Hook <gary.hook@amd.com>,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        Arnaud Ebalard <arno@natisbad.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Alasdair Kergon <agk@redhat.com>, Mike Snitzer <snitzer@redhat.com>,
        device-mapper development <dm-devel@redhat.com>,
        Shaohua Li <shli@kernel.org>, Steve French <sfrench@samba.org>,
        "Theodore Y. Ts'o" <tytso@mit.edu>, Jaegeuk Kim <jaegeuk@kernel.org>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
        James Morris <james.l.morris@oracle.com>,
        "Serge E. Hallyn" <serge@hallyn.com>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
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On Tue, Sep 5, 2017 at 2:23 PM, Harsh Jain <harshjain.prof@gmail.com> wrote:
> On Sun, Sep 3, 2017 at 11:47 AM, Gilad Ben-Yossef <gilad@benyossef.com> wrote:
>> On Thu, Aug 31, 2017 at 3:31 PM, Harsh Jain <harshjain.prof@gmail.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.
>>

I see. Makes sense.

Thanks,
Gilad

-- 
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