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From: Hannes Reinecke <hare@suse.de>
To: Sagi Grimberg <sagi@grimberg.me>,
	Chuck Lever III <chuck.lever@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>, Keith Busch <kbusch@kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	Chuck Lever <cel@kernel.org>,
	"kernel-tls-handshake@lists.linux.dev"
	<kernel-tls-handshake@lists.linux.dev>
Subject: Re: [PATCH 15/18] nvmet-tcp: enable TLS handshake upcall
Date: Mon, 27 Mar 2023 08:20:15 +0200	[thread overview]
Message-ID: <7c3da604-251f-209e-db6d-d1bee5a838c5@suse.de> (raw)
In-Reply-To: <c9b5bb2d-89d7-8805-6d60-2c53e13f5d58@grimberg.me>

On 3/26/23 09:18, Sagi Grimberg wrote:
> 
[ .. ]
>>
>> Nearly there.
>>
>> The actual patch would be:
>>
>> @@ -2031,10 +1988,16 @@ static void nvmet_tcp_listen_data_ready(struct 
>> sock *sk)
>>          trace_sk_data_ready(sk);
>>
>>          read_lock_bh(&sk->sk_callback_lock);
>> +       /* Ignore if the callback has been changed */
>> +       if (sk->sk_data_ready != nvmet_tcp_listen_data_ready)
>> +               goto out;
>>          port = sk->sk_user_data;
>>          if (!port)
>>                  goto out;
>>
>> +       if (port->data_ready)
>> +               port->data_ready(sk);
>> +
>>          if (sk->sk_state == TCP_LISTEN)
>>                  queue_work(nvmet_wq, &port->accept_work);
>>   out:
>>
>> As the callbacks will be changed once TLS is activated, and we really 
>> should not attempt to run if sk_data_ready() points to another function,
>> as then the sk_user_data pointer will most likely be changed, too,
>> causing all sorts of issues.
> 
> Umm, something is unclear to me. if nvmet_tcp_listen_data_ready is
> called doesn't it by definition mean that sk->sk_data_ready ==
> nvmet_tcp_listen_data_ready ?
> 
> Are you talking about a situation where between
> nvmet_tcp_listen_data_ready is starting and until the
> sk->sk_callback_lock the data_ready cb (and the user data
> pointer) is changed?

No. Far simpler:
Starting kTLS will change the callbacks.
So sk->sk_data_ready will point to our callback before
the upcall, but to the kTLS version _after_ the upcall.
It typically doesn't matter, as we're setting it to
nvmet_tcp_data_ready() anyway.
But there might be the odd case where the data_ready
callback is invoked after kTLS has been started but before
we're setting it to nvmet_tcp_data_ready().
Then we cannot guarantee that sk_user_data really is set
to the 'queue' pointer, so we should skip the function.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Ivo Totev, Andrew
Myers, Andrew McDonald, Martje Boudien Moerman


  reply	other threads:[~2023-03-27  6:20 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-21 12:43 [RFC PATCH 00/18] nvme: In-kernel TLS support for TCP Hannes Reinecke
2023-03-21 12:43 ` [PATCH 01/18] nvme-keyring: register '.nvme' keyring Hannes Reinecke
2023-03-21 13:50   ` Sagi Grimberg
2023-03-21 14:11     ` Hannes Reinecke
2023-03-21 12:43 ` [PATCH 02/18] nvme-keyring: define a 'psk' keytype Hannes Reinecke
2023-03-22  8:29   ` Sagi Grimberg
2023-03-22  8:38     ` Hannes Reinecke
2023-03-22  8:49       ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 03/18] nvme: add TCP TSAS definitions Hannes Reinecke
2023-03-21 13:46   ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 04/18] nvme-tcp: add definitions for TLS cipher suites Hannes Reinecke
2023-03-22  8:18   ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 05/18] nvme-tcp: implement recvmsg rx flow for TLS Hannes Reinecke
2023-03-21 13:39   ` Sagi Grimberg
2023-03-21 13:59     ` Hannes Reinecke
2023-03-22  8:01       ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 06/18] nvme-tcp: call 'queue->data_ready()' in nvme_tcp_data_ready() Hannes Reinecke
2023-03-21 13:44   ` Sagi Grimberg
2023-03-21 14:09     ` Hannes Reinecke
2023-03-22  0:18       ` Chris Leech
2023-03-22  6:59         ` Hannes Reinecke
2023-03-22  8:12           ` Sagi Grimberg
2023-03-22  8:08       ` Sagi Grimberg
2023-03-22  8:26         ` Hannes Reinecke
2023-03-22 10:13           ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 07/18] nvme/tcp: allocate socket file Hannes Reinecke
2023-03-21 13:52   ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 08/18] nvme-tcp: enable TLS handshake upcall Hannes Reinecke
2023-03-22  8:45   ` Sagi Grimberg
2023-03-22  9:12     ` Hannes Reinecke
2023-03-22 10:56       ` Sagi Grimberg
2023-03-22 12:54         ` Hannes Reinecke
2023-03-22 13:16           ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 09/18] nvme-tcp: add connect option 'tls' Hannes Reinecke
2023-03-22  9:24   ` Sagi Grimberg
2023-03-22  9:59     ` Hannes Reinecke
2023-03-22 10:09       ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 10/18] nvme-tcp: fixup send workflow for kTLS Hannes Reinecke
2023-03-22  9:31   ` Sagi Grimberg
2023-03-22 10:08     ` Hannes Reinecke
2023-03-22 11:18       ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 11/18] nvme-tcp: control message handling for recvmsg() Hannes Reinecke
2023-03-22 11:33   ` Sagi Grimberg
2023-03-22 11:48     ` Hannes Reinecke
2023-03-22 11:50       ` Sagi Grimberg
2023-03-22 12:17         ` Hannes Reinecke
2023-03-22 12:29           ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 12/18] nvmet: make TCP sectype settable via configfs Hannes Reinecke
2023-03-22 11:38   ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 13/18] nvmet-tcp: allocate socket file Hannes Reinecke
2023-03-22 11:46   ` Sagi Grimberg
2023-03-22 12:07     ` Hannes Reinecke
2023-03-21 12:43 ` [PATCH 14/18] security/keys: export key_lookup() Hannes Reinecke
2023-03-21 12:43 ` [PATCH 15/18] nvmet-tcp: enable TLS handshake upcall Hannes Reinecke
2023-03-22 12:13   ` Sagi Grimberg
2023-03-22 12:34     ` Hannes Reinecke
2023-03-22 12:51       ` Sagi Grimberg
2023-03-22 13:47         ` Hannes Reinecke
2023-03-22 15:42           ` Sagi Grimberg
2023-03-22 16:43             ` Hannes Reinecke
2023-03-22 16:49               ` Chuck Lever III
2023-03-23  7:21                 ` Sagi Grimberg
2023-03-24 11:29                   ` Hannes Reinecke
2023-03-26  7:18                     ` Sagi Grimberg
2023-03-27  6:20                       ` Hannes Reinecke [this message]
2023-03-28  8:44                         ` Sagi Grimberg
2023-03-28  9:20                           ` Hannes Reinecke
2023-03-28  9:43                             ` Sagi Grimberg
2023-03-28 10:04                               ` Hannes Reinecke
2023-03-28 13:22                           ` Chuck Lever III
2023-03-28 15:29                             ` Sagi Grimberg
2023-03-28 15:56                               ` Chuck Lever III
2023-03-29  6:33                                 ` Sagi Grimberg
2023-03-23  7:44               ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 16/18] nvmet-tcp: rework sendpage for kTLS Hannes Reinecke
2023-03-22 12:16   ` Sagi Grimberg
2023-03-21 12:43 ` [PATCH 17/18] nvmet-tcp: control messages for recvmsg() Hannes Reinecke
2023-03-21 12:43 ` [PATCH 18/18] nvmet-tcp: peek icreq before starting TLS Hannes Reinecke
2023-03-22 12:24   ` Sagi Grimberg
2023-03-22 12:38     ` Hannes Reinecke
2023-03-21 13:12 ` [RFC PATCH 00/18] nvme: In-kernel TLS support for TCP Sagi Grimberg
2023-03-21 13:30   ` Hannes Reinecke
2023-03-22  8:16     ` Sagi Grimberg
2023-03-22  8:28       ` Hannes Reinecke
2023-03-22 12:53         ` Sagi Grimberg
2023-03-22 15:10           ` Hannes Reinecke
2023-03-22 15:43             ` Sagi Grimberg
2023-03-29 13:59 [PATCHv2 " Hannes Reinecke
2023-03-29 13:59 ` [PATCH 15/18] nvmet-tcp: enable TLS handshake upcall Hannes Reinecke
2023-04-03 12:51   ` Sagi Grimberg
2023-04-03 14:05     ` Hannes Reinecke

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