netdev - Re: [PATCH 1/3] netdev: introduce new NETIF_F_HW_SWITCH_OFFLOAD feature flag for switch device offloads

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Date:	Fri, 5 Dec 2014 11:21:02 +0800
From:	Jianhua Xie <jianhua.xie@...escale.com>
To:	<roopa@...ulusnetworks.com>, <jiri@...nulli.us>,
	<sfeldma@...il.com>, <jhs@...atatu.com>, <bcrl@...ck.org>,
	<tgraf@...g.ch>, <john.fastabend@...il.com>,
	<stephen@...workplumber.org>, <linville@...driver.com>,
	<nhorman@...driver.com>, <nicolas.dichtel@...nd.com>,
	<vyasevic@...hat.com>, <f.fainelli@...il.com>,
	<buytenh@...tstofly.org>, <aviadr@...lanox.com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<shm@...ulusnetworks.com>, <gospo@...ulusnetworks.com>,
	Jianhua Xie <jianhua.xie@...escale.com>
Subject: Re: [PATCH 1/3] netdev: introduce new NETIF_F_HW_SWITCH_OFFLOAD feature
 flag for switch device offloads


在 2014年12月05日 10:26, roopa@...ulusnetworks.com 写道:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> This is a generic high level feature flag for all switch asic features today.
>
> switch drivers set this flag on switch ports. Logical devices like
> bridge, bonds, vxlans can inherit this flag from their slaves/ports.
>
> I had to use SWITCH in the name to avoid ambiguity with other feature
> flags. But, since i have been harping about not calling it 'switch',
> I am welcome to any suggestions :)
>
> An alternative to using a feature flag is to use a IFF_HW_OFFLOAD
> in net_device_flags.
> ---
>   include/linux/netdev_features.h |    2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
> index 8e30685..68db1de 100644
> --- a/include/linux/netdev_features.h
> +++ b/include/linux/netdev_features.h
> @@ -66,6 +66,7 @@ enum {
>   	NETIF_F_HW_VLAN_STAG_FILTER_BIT,/* Receive filtering on VLAN STAGs */
>   	NETIF_F_HW_L2FW_DOFFLOAD_BIT,	/* Allow L2 Forwarding in Hardware */
>   	NETIF_F_BUSY_POLL_BIT,		/* Busy poll */
> +	NETIF_F_HW_SWITCH_OFFLOAD_BIT,  /* HW switch offload */
I am interested in this flag very much, but I am not very clear
how many offload capabilities does this flag imply.  If this flag
belongs to a general flag and can be accepted by all vendors,
I will reuse this flag to introduce another out going data traffics
distribution offload method to bonding driver.

Thanks & B.R.
Jianhua
>   
>   	/*
>   	 * Add your fresh new feature above and remember to update
> @@ -124,6 +125,7 @@ enum {
>   #define NETIF_F_HW_VLAN_STAG_TX	__NETIF_F(HW_VLAN_STAG_TX)
>   #define NETIF_F_HW_L2FW_DOFFLOAD	__NETIF_F(HW_L2FW_DOFFLOAD)
>   #define NETIF_F_BUSY_POLL	__NETIF_F(BUSY_POLL)
> +#define NETIF_F_HW_SWITCH_OFFLOAD	__NETIF_F(HW_SWITCH_OFFLOAD)
>   
>   /* Features valid for ethtool to change */
>   /* = all defined minus driver/device-class-related */

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