How to shut down flow control in DPDK ?

Hi,
I want to shut down flow control in DPDK,
I only kwon the function rte_eth_dev_flow_ctrl_set(uint8_t port_id, struct rte_eth_fc_conf *fc_conf) can do this.
But I don't kwon how config the struct rte_eth_fc_conf. I try config it like that :

static struct rte_eth_fc_conf fc_conf={
.high_water=100,
.low_water=10,
.pause_time=1,
.send_xon=0,
.mode=RTE_FC_NONE,
};

But other card which we link to can still able to control the speed of our tx.

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The following seems to work:

	struct rte_eth_fc_conf fcoff = {
		.pause_time = DEFAULT_FCPAUSE,
		.send_xon = 1,
		.mode = RTE_FC_NONE,
	};
...
	/* Disable 802 flow control since it can lead to head-of-line
	   blocking. Ignore errors some drivers do it now. */
	ret = rte_eth_dev_flow_ctrl_set(portid, &fcoff);
	if (ret < 0 && ret != -ENOTSUP)
               log a message..