linux-kernel - Re: [RFC][PATCH 00/18] crypto: Add generic Kerberos library

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Message-Id: <7BD0DE04-7D80-4C0B-AF59-3588762A0EFC@oracle.com>
Date:   Thu, 12 Nov 2020 16:09:32 -0500
From:   Chuck Lever <chuck.lever@...cle.com>
To:     Bruce Fields <bfields@...ldses.org>
Cc:     David Howells <dhowells@...hat.com>,
        CIFS <linux-cifs@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        linux-crypto@...r.kernel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-afs@...ts.infradead.org
Subject: Re: [RFC][PATCH 00/18] crypto: Add generic Kerberos library



> On Nov 12, 2020, at 4:07 PM, Bruce Fields <bfields@...ldses.org> wrote:
> 
> On Thu, Nov 12, 2020 at 04:54:06PM +0000, David Howells wrote:
>> Chuck Lever <chuck.lever@...cle.com> wrote:
>> 
>>> Really? My understanding of the Linux kernel SUNRPC implementation is
>>> that it uses asynchronous, even for small data items. Maybe I'm using
>>> the terminology incorrectly.
>> 
>> Seems to be synchronous, at least in its use of skcipher:
> 
> Yes, it's all synchronous.  The only cases where we defer and revisit a
> request is when we need to do upcalls to userspace.
> 
> (And those upcalls mostly come after we're done with unwrapping and
> verifying a request, so now I'm sort of curious exactly what Chuck was
> seeing.)

I vaguely recall that setting CRYPTO_TFM_REQ_MAY_SLEEP allows the
crypto API to sleep and defer completion.


--
Chuck Lever