netdev - Re: [RFC 1/2] net/tls: don't clear socket error if strparser aborted

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Date:   Mon, 07 Oct 2019 14:58:17 +0200 (CEST)
From:   David Miller <davem@...emloft.net>
To:     jakub.kicinski@...ronome.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, willemb@...gle.com,
        oss-drivers@...ronome.com, davejwatson@...com, borisp@...lanox.com,
        aviadye@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net, simon.horman@...ronome.com
Subject: Re: [RFC 1/2] net/tls: don't clear socket error if strparser
 aborted

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Sun,  6 Oct 2019 20:53:22 -0700

> If strparser encounters an error it reports it on the socket and
> stops any further processing. TLS RX will currently pick up that
> error code with sock_error(), and report it to user space once.
> Subsequent read calls will block indefinitely.
> 
> Since the error condition is not cleared and processing is not
> restarted it seems more correct to keep returning the error
> rather than sleeping.
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Simon Horman <simon.horman@...ronome.com>

So I guess this is all about what the usual socket error code
semantics work, which is report-and-clear.

States which should signal errors are always checked in the
various code socket call paths and if necessary the socket
error is resignalled.

>From what I'm seeing here, the issue is that the strparser stopped
state isn't resampled at the appropriate spot.  So I would rather
see that fixed rather than having socket errors become level
triggered in this special case.