linux-kernel - Re: [PATCH 8/8] NTB: ntb_test: Fix bug when counting remote files

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Date:   Fri, 20 Jul 2018 10:33:36 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-ntb@...glegroups.com,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 8/8] NTB: ntb_test: Fix bug when counting remote files



On 15/06/18 01:51 PM, Serge Semin wrote:
> I also tested this script in the looped-back setup. It is the case when two
> NTB-device ports are available at the same RootComplex. So the NTB can be
> configured from the single executional context. In this case the REMOTE_HOST is left
> empty, so the colon is left prepended to the corresponding paths and causes multiple
> errors including the one fixed by this patch. In order to fix it, we need to discard
> the colon for remote-less case, for instance, by the next patch:
> 
> @@ -482,7 +495,11 @@ function perf_test()
>  function ntb_tool_tests()
>  {
>  	LOCAL_TOOL="$DEBUGFS/ntb_tool/$LOCAL_DEV"
> -	REMOTE_TOOL="$REMOTE_HOST:$DEBUGFS/ntb_tool/$REMOTE_DEV"
> +	if [[ "${REMOTE_HOST}" != "" ]]; then
> +		REMOTE_TOOL="$REMOTE_HOST:$DEBUGFS/ntb_tool/$REMOTE_DEV"
> +	else
> +		REMOTE_TOOL="$DEBUGFS/ntb_tool/$REMOTE_DEV"
> +	fi
>  
>  	echo "Starting ntb_tool tests..."
>  
> And so on for REMOTE_PP and REMOTE_PERF. It is necessary for NTB devices, which ports
> are looped-back to the same Root-Port. Would you be amenable if you resent this patch
> together with the fix I suggested?
I took a closer look at this and it's not necessary. (Note: I do the
majority of my testing in a looped-back setup).

What you didn't notice is that split_remote() separates the colon
whether there is a host or not. It's not passed to ssh or cat (or
whatever) directly. So the change you propose will actually break the
how it was designed.

Logan