netdev - Re: [PATCH net-next 2/3] net: ethernet: mediatek: add ethtool functions to configure RX flows of HW LRO

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Message-ID: <0416bf6a-1a3d-f8fe-9150-8f143c48ee8c@gmail.com>
Date:   Tue, 13 Sep 2016 11:26:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Nelson Chang <nelson.chang@...iatek.com>, john@...ozen.org,
        davem@...emloft.net
Cc:     nbd@...nwrt.org, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, nelsonch.tw@...il.com
Subject: Re: [PATCH net-next 2/3] net: ethernet: mediatek: add ethtool
 functions to configure RX flows of HW LRO

On 09/13/2016 06:54 AM, Nelson Chang wrote:
> The codes add ethtool functions to set RX flows for HW LRO. Because the
> HW LRO hardware can only recognize the destination IP of TCP/IP RX flows,
> the ethtool command to add HW LRO flow is as below:
> ethtool -N [devname] flow-type tcp4 dst-ip [ip_addr] loc [0~1]
> 
> Otherwise, cause the hardware can set total four destination IPs, each
> GMAC (GMAC1/GMAC2) can set two IPs separately at most.
> 
> Signed-off-by: Nelson Chang <nelson.chang@...iatek.com>
> ---

> +
> +static int mtk_set_features(struct net_device *dev, netdev_features_t features)
> +{
> +	int err = 0;
> +
> +	if (!((dev->features ^ features) & NETIF_F_LRO))
> +		return 0;
> +
> +	if (!(features & NETIF_F_LRO))
> +		mtk_hwlro_netdev_disable(dev);

you may want to implement a fix_features ndo operations which makes sure
that NETIF_F_LRO is turned on in case a RX flow is programmed,
otherwise, it may be confusing to the user that a flow was programmed,
but no offload is happening.
-- 
Florian