netdev - Re: [RFC PATCH 1/2] net: Add support for hardware-offloaded encapsulation

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Message-ID: <20121025141656.5383dabe@nehalam.linuxnetplumber.net>
Date:	Thu, 25 Oct 2012 14:16:56 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Joseph Gasparakis <joseph.gasparakis@...el.com>
Cc:	davem@...emloft.net, chrisw@...s-sol.org, netdev@...r.kernel.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [RFC PATCH 1/2] net: Add support for hardware-offloaded
 encapsulation

On Thu, 25 Oct 2012 11:29:12 -0700
Joseph Gasparakis <joseph.gasparakis@...el.com> wrote:

> @@ -19,6 +19,7 @@ enum {
>  	NETIF_F_IP_CSUM_BIT,		/* Can checksum TCP/UDP over IPv4. */
>  	__UNUSED_NETIF_F_1,
>  	NETIF_F_HW_CSUM_BIT,		/* Can checksum all the packets. */
> +	NETIF_F_HW_CSUM_ENC_BIT,	/* Can checksum all inner headers */
>  	NETIF_F_IPV6_CSUM_BIT,		/* Can checksum TCP/UDP over IPV6 */
>  	NETIF_F_HIGHDMA_BIT,		/* Can DMA to high memory. */
>  	NETIF_F_FRAGLIST_BIT,		/* Scatter/gather IO. */
> @@ -52,6 +53,8 @@ enum {
>  	NETIF_F_NTUPLE_BIT,		/* N-tuple filters supported */
>  	NETIF_F_RXHASH_BIT,		/* Receive hashing offload */
>  	NETIF_F_RXCSUM_BIT,		/* Receive checksumming offload */
> +	NETIF_F_RXCSUM_ENC_BIT,		/* Receive checksuming offload */
> +					/* for encapsulation */
>  	NETIF_F_NOCACHE_COPY_BIT,	/* Use no-cache copyfromuser */
>  	NETIF_F_LOOPBACK_BIT,		/* Enable loopback */
>  	NETIF_F_RXFCS_BIT,		/* Append FCS to skb pkt data */

Add new features at the end, or reuse __UNUSED_ bits to avoid any
issues with binary compatibility. I don't think these bits are in any
userspace API, maybe ethtool?
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