From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ferruh Yigit <ferruh.yigit@intel.com>
Subject: Re: [PATCH v2 36/46] net/liquidio: add API to set MTU
Date: Tue, 21 Mar 2017 12:24:49 +0000
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 <1488454371-3342-1-git-send-email-shijith.thotton@caviumnetworks.com>
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Cc: dev@dpdk.org, Jerin Jacob <jerin.jacob@caviumnetworks.com>,
 Derek Chickles <derek.chickles@caviumnetworks.com>,
 Venkat Koppula <venkat.koppula@caviumnetworks.com>,
 Srisivasubramanian S <ssrinivasan@caviumnetworks.com>,
 Mallesham Jatharakonda <mjatharakonda@oneconvergence.com>
To: Shijith Thotton <shijith.thotton@caviumnetworks.com>
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On 3/2/2017 11:32 AM, Shijith Thotton wrote:
> Signed-off-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>
> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
> Signed-off-by: Venkat Koppula <venkat.koppula@caviumnetworks.com>
> Signed-off-by: Srisivasubramanian S <ssrinivasan@caviumnetworks.com>
> Signed-off-by: Mallesham Jatharakonda <mjatharakonda@oneconvergence.com>

<...>

>  
>  static int
> +lio_dev_change_vf_mtu(struct rte_eth_dev *eth_dev, uint16_t new_mtu)
> +{
> +	struct lio_device *lio_dev = LIO_DEV(eth_dev);
> +
> +	PMD_INIT_FUNC_TRACE();
> +
> +	if (!lio_dev->intf_open) {
> +		lio_dev_err(lio_dev, "Port %d down, can't change MTU\n",
> +			    lio_dev->port_id);
> +		return -EINVAL;
> +	}
> +
> +	/* Limit the MTU to make sure the ethernet packets are between
> +	 * ETHER_MIN_MTU bytes and PF's MTU
> +	 */
> +	if ((new_mtu < ETHER_MIN_MTU) ||
> +			(new_mtu > lio_dev->linfo.link.s.mtu)) {
> +		lio_dev_err(lio_dev, "Invalid MTU: %d\n", new_mtu);
> +		lio_dev_err(lio_dev, "Valid range %d and %d\n",
> +			    ETHER_MIN_MTU, lio_dev->linfo.link.s.mtu);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}

Is this really sets the MTU?
"new_mtu" seems not used, except limit check, an lio_send_ctrl_pkt()
required perhaps?