netdev - Re: [PATCHv6 0/5] net/tls: fixes for NVMe-over-TLS

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Date: Mon, 3 Jul 2023 15:15:37 +0200
From: Hannes Reinecke <hare@...e.de>
To: Sagi Grimberg <sagi@...mberg.me>, David Howells <dhowells@...hat.com>
Cc: Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
 linux-nvme@...ts.infradead.org, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org
Subject: Re: [PATCHv6 0/5] net/tls: fixes for NVMe-over-TLS

On 7/3/23 14:33, Sagi Grimberg wrote:
> 
>> Hannes Reinecke <hare@...e.de> wrote:
>>
>>>> 'discover' and 'connect' works, but when I'm trying to transfer data
>>>> (eg by doing a 'mkfs.xfs') the whole thing crashes horribly in
>>>> sock_sendmsg() as it's trying to access invalid pages :-(
>>
>> Can you be more specific about the crash?
> 
> Hannes,
> 
> See:
> [PATCH net] nvme-tcp: Fix comma-related oops

Ah, right. That solves _that_ issue.

But now I'm deadlocking on the tls_rx_reader_lock() (patched as to your 
suggestion). Investigating.

But it brought up yet another can of worms: what _exactly_ is the return 
value of ->read_sock()?

There are currently two conflicting use-cases:
-> Ignore the return value, and assume errors etc are signalled
    via 'desc.error'.
    net/strparser/strparser.c
    drivers/infiniband/sw/siw
    drivers/scsi/iscsi_tcp.c
-> use the return value of ->read_sock(), ignoring 'desc.error':
    drivers/nvme/host/tcp.c
    net/ipv4/tcp.c
So which one is it?
Needless to say, implementations following the second style do not
set 'desc.error', causing any errors there to be ignored for callers
from the first style...
Jakub?

Cheers,

Hannes