netdev - Re: [PATCH] vlan: restore ethtool ABI to control VLAN hardware acceleration

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Date:	Mon, 17 Jun 2013 19:20:54 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Fernando Luis Vázquez Cao 
	<fernando_b1@....ntt.co.jp>
CC:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] vlan: restore ethtool ABI to control VLAN hardware
 acceleration

On Mon, 2013-06-17 at 11:28 +0900, Fernando Luis Vázquez Cao wrote:
> As part of the push to add 802.1ad server provider tagging support to the
> kernel the VLAN features flags were renamed. Unfortunately the kernel name
> for the VLAN hardware acceleration features that the kernel shows user space
> was included in the rename, which broke ethtool (txvlan and rxvlan options
> do not work).

I expected something like that and said this was an ABI change, but
apparently my objection wasn't sufficient.

> This patch restores the original names, i.e. the original ABI.
> If we wanted to make clear to users that we are refering to CTAGs we can
> always change ethtool's short_name and long_name for these features (for
> example something along the lines of txvlan -> txvlan-ctag, tx-vlan-offload ->
> tx-vlan-ctag-offload).
> 
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>

Reviewed-by: Ben Hutchings <bhutchings@...arflare.com>

Ben.

> ---
> 
> diff -urNp linux-3.10-rc5-orig/net/core/ethtool.c linux-3.10-rc5/net/core/ethtool.c
> --- linux-3.10-rc5-orig/net/core/ethtool.c	2013-06-09 09:41:04.000000000 +0900
> +++ linux-3.10-rc5/net/core/ethtool.c	2013-06-14 23:08:22.330454778 +0900
> @@ -60,10 +60,10 @@ static const char netdev_features_string
>  	[NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
>  	[NETIF_F_HIGHDMA_BIT] =          "highdma",
>  	[NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
> -	[NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-ctag-hw-insert",
> +	[NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
>  
> -	[NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-ctag-hw-parse",
> -	[NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-ctag-filter",
> +	[NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
> +	[NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
>  	[NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
>  	[NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
>  	[NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
> 

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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