From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: [PATCH v14 8/8] testpmd: use Tx preparation in csum
	engine
Date: Thu, 22 Dec 2016 15:28:25 +0100
Message-ID: <1810480.qPN0Rit7zn@xps13>
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To: Tomasz Kulasek <tomaszx.kulasek@intel.com>
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2016-12-22 14:05, Tomasz Kulasek:
> Since all current drivers supports Tx preparation API, it is used
> in csum forwarding engine by default for all drivers.
[...]
> +/*
> + * Enable Tx preparation path in the "csum" engine.
> + */
> +uint8_t tx_prepare;

It seems this variable is not used.