netdev - Re: [PATCH net-next 4/4] net: qualcomm: rmnet: Add support for GRO

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Date:   Wed, 25 Oct 2017 07:00:57 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Tom Herbert <tom@...bertland.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 4/4] net: qualcomm: rmnet: Add support for GRO

On Tue, 2017-10-24 at 22:55 -0600, Subash Abhinov Kasiviswanathan wrote:
> Add gro_cells so that rmnet devices can call gro_cells_receive
> instead of netif_receive_skb.
> 

>  void rmnet_vnd_setup(struct net_device *rmnet_dev)
>  {
> +	struct rmnet_priv *priv = netdev_priv(rmnet_dev);
> +
>  	rmnet_dev->netdev_ops = &rmnet_vnd_ops;
>  	rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE;
>  	rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM;
> @@ -162,6 +164,8 @@ void rmnet_vnd_setup(struct net_device *rmnet_dev)
>  	rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
>  
>  	rmnet_dev->needs_free_netdev = true;
> +
> +	gro_cells_init(&priv->gro_cells, rmnet_dev);
>  }


You need to check return code and abort if memory could not be
allocated.

There is a reason this helper has _init() prefix, it does not belong to
_setup() since a _setup() is not expected to fail.

Please take a look at other gro_cells_init() callers, and you will
notice that it is called from ndo_init()

You might have copied the only buggy caller (vxlan).

Tom, if you read me fix vxlan, thanks !