netdev - Re: [PATCH v1 2/2] drivers: net: xgene: Adding support for TSO

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Date:	Mon, 17 Aug 2015 17:27:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	isubramanian@....com
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kchudgar@....com, patches@....com
Subject: Re: [PATCH v1 2/2] drivers: net: xgene: Adding support for TSO

From: Iyappan Subramanian <isubramanian@....com>
Date: Mon, 17 Aug 2015 14:33:05 -0700

> +			/* HW requires all header resides in the first buffer */
> +			if (skb_is_nonlinear(skb) &&
> +			    (skb_headlen(skb) < hdr_len)) {
> +				netdev_warn(ndev, "Headers are required to reside in header buffer\n");
> +				dev_kfree_skb(skb);
> +				return 0;
> +			}

You can't just drop the packet in this situation.

Instead, you must at least try to linearize the header to fit your
needs.
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