[stgt] [PATCH] Add support for sending iSCSI NOP-IN

[FUJITA Tomonori]

Very Sorry about the delay.

On Sat,  8 Jun 2013 08:13:58 -0700
Ronnie Sahlberg <ronniesahlberg at gmail.com> wrote:

> Add target initiated NOP-IN so we can detect when an initiator is no longer available
> and tear down the connection.
> Add documentation to the manpage on how to configure the use of NOP-IN, the intervals
> between the NOP-INs and after how many consequitive failures we will tear down the connection.
> 
> Disabled by default to preserve the current behaviour but can be enabled/configured on the TGTD
> command line.
> 
> Signed-off-by: Ronnie Sahlberg <ronniesahlberg at gmail.com>
> ---
>  doc/tgtd.8.xml        |   29 +++++++++++++++
>  usr/iscsi/iscsi_tcp.c |   95 ++++++++++++++++++++++++++++++++++++++++++++++++-
>  usr/iscsi/iscsid.c    |   46 +++++++++++++++++++----
>  usr/iscsi/iscsid.h    |    2 +
>  usr/iscsi/transport.h |    1 +
>  5 files changed, 164 insertions(+), 9 deletions(-)
> 
> diff --git a/doc/tgtd.8.xml b/doc/tgtd.8.xml
> index ce734ce..764e3fb 100644
> --- a/doc/tgtd.8.xml
> +++ b/doc/tgtd.8.xml
> @@ -129,6 +129,35 @@
>        </screen>
>        </para>
>      </refsect2>
> +    <refsect2><title>noop_interval=<integer></title>
> +      <para>
> +	This option enables TGTD to send send NOP-OUT to check is
> +	a connected initiator is still alive.
> +	This parameter specifies the interval between each NOP-OUT that
> +	TGTD will send in seconds.
> +      </para>
> +      <para>
> +	This feature is disabled by default.
> +      </para>
> +    </refsect2>
> +    <refsect2><title>noop_count=<integer></title>
> +      <para>
> +	When sending NOP-OUT to the initiator, after this many consecutive
> +	failures TGTD will terminate the connection to the client.
> +	This feature can be used to read dead connections faster than waiting
> +	for any TCP-Keepalive to trigger.
> +      </para>
> +      <para>
> +	This feature is disabled by default.
> +      </para>
> +      <para>
> +      Example: send NOP-OUT every 5 seconds and abort the session after
> +      6 failures.
> +      <screen format="linespecific">
> +	tgtd --iscsi portal=192.0.2.1:3260,noop_interval=5,noop_count=6

Per target?
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