On 4/19/2017 2:09 PM, Hemant Agrawal wrote:

Typically when the PMD issues a RX command to DPAA2 hardware,
the hw writes the available descriptors into the given memory.
The RX function then processes the frames and prepare them as
mbufs.

This patch adds support to issue another pull request to hardware
in another memory location, before we start processing the output
of the first request. This help in controlling the cpu cycles
wasted during the wait for the hardware to write the descriptors.

During hw debugging, it may be desired to keep the original
mode, so the original mode is also preserved and can be controlled
with an env flag.

Signed-off-by: Hemant Agrawal <redacted>

<...>

 
+	/*If no prefetch is configured. */
+	if (getenv("DPAA2_RX_NO_PREFETCH")) {

Instead of getting configuration option from environment variable, can
you please make it argument to the driver?
This will be more consistent to the DPDK usage.

+		eth_dev->rx_pkt_burst = dpaa2_dev_rx;
+		PMD_INIT_LOG(INFO, "No Prefetch enabled");
+	}
+

<...>