netdev - Re: [net-next PATCH 3/7] net: sched: add cls

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Date:	Thu, 4 Feb 2016 15:18:57 +0200
From:	"Amir Vadai\"" <amir@...ai.me>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	ogerlitz@...lanox.com, jiri@...nulli.us, jhs@...atatu.com,
	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [net-next PATCH 3/7] net: sched: add cls_u32 offload hooks for
 netdevs

On Wed, Feb 03, 2016 at 01:28:37AM -0800, John Fastabend wrote:
> This patch allows netdev drivers to consume cls_u32 offloads via
> the ndo_setup_tc ndo op.
> 
> This works aligns with how network drivers have been doing qdisc
> offloads for mqprio.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> ---
>  include/linux/netdevice.h |    6 +++-
>  include/net/pkt_cls.h     |   33 ++++++++++++++++++++
>  net/sched/cls_u32.c       |   73 ++++++++++++++++++++++++++++++++++++++++++++-
>  3 files changed, 109 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 9090ff7..861ce67 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -778,17 +778,21 @@ static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
>  typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
>  				       struct sk_buff *skb);
>  
> -/* This structure holds attributes of qdisc and classifiers
> +/* These structures hold the attributes of qdisc and classifiers
>   * that are being passed to the netdevice through the setup_tc op.
>   */
>  enum {
>  	TC_SETUP_MQPRIO,
> +	TC_SETUP_CLSU32,
>  };
>  
> +struct tc_cls_u32_offload;
> +
>  struct tc_to_netdev {
>  	unsigned int type;
>  	union {
>  		u8 tc;
> +		struct tc_cls_u32_offload *cls_u32;
>  	};
>  };
>  
> diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
> index bc49967..0bd12cd 100644
> --- a/include/net/pkt_cls.h
> +++ b/include/net/pkt_cls.h
> @@ -358,4 +358,37 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
>  }
>  #endif /* CONFIG_NET_CLS_IND */
>  
> +struct tc_cls_u32_knode {
> +	struct tcf_exts *exts;
> +	u8 fshift;
> +	u32 handle;
> +	u32 val;
> +	u32 mask;
> +	u32 link_handle;
> +	struct tc_u32_sel *sel;
> +};
> +
> +struct tc_cls_u32_hnode {
> +	u32 handle;
> +	u32 prio;
> +	unsigned int divisor;
> +};
> +
> +enum {
> +	TC_CLSU32_NEW_KNODE,
TC_CLSU32_NEW_KNODE is never used

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