netdev - Re: [PATCH 1/6] [net-next]net: sched: act_mirred: Extend redirect action to accept a traffic class

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Date:   Tue, 1 Aug 2017 06:22:16 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Amritha Nambiar <amritha.nambiar@...el.com>,
        intel-wired-lan@...ts.osuosl.org, jeffrey.t.kirsher@...el.com
Cc:     alexander.h.duyck@...el.com, kiran.patil@...el.com,
        netdev@...r.kernel.org, mitch.a.williams@...el.com,
        alexander.duyck@...il.com, neerav.parikh@...el.com,
        sridhar.samudrala@...el.com, carolyn.wyborny@...el.com
Subject: Re: [PATCH 1/6] [net-next]net: sched: act_mirred: Extend redirect
 action to accept a traffic class

On 17-07-31 08:37 PM, Amritha Nambiar wrote:
> The Mirred/redirect action is extended to forward to a traffic
> class on the device. The traffic class index needs to be
> provided in addition to the device's ifindex.
> 
> Example:
> # tc filter add dev eth0 protocol ip parent ffff: prio 1 flower\
>    dst_ip 192.168.1.1/32 ip_proto udp dst_port 22\
>    skip_sw indev eth0 action mirred ingress redirect dev eth0 tc 1
> 
> Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
> ---
>   include/net/tc_act/tc_mirred.h        |    7 +++++++
>   include/uapi/linux/tc_act/tc_mirred.h |    5 +++++
>   net/sched/act_mirred.c                |   17 +++++++++++++++++
>   3 files changed, 29 insertions(+)
> 
> diff --git a/include/net/tc_act/tc_mirred.h b/include/net/tc_act/tc_mirred.h
> index 604bc31..60058c4 100644
> --- a/include/net/tc_act/tc_mirred.h
> +++ b/include/net/tc_act/tc_mirred.h
> @@ -9,6 +9,8 @@ struct tcf_mirred {
>   	int			tcfm_eaction;
>   	int			tcfm_ifindex;
>   	bool			tcfm_mac_header_xmit;
> +	u8			tcfm_tc;
> +	u32			flags;
>   	struct net_device __rcu	*tcfm_dev;
>   	struct list_head	tcfm_list;
>   };
> @@ -37,4 +39,9 @@ static inline int tcf_mirred_ifindex(const struct tc_action *a)
>   	return to_mirred(a)->tcfm_ifindex;
>   }
>   
> +static inline int tcf_mirred_tc(const struct tc_action *a)
> +{
> +	return to_mirred(a)->tcfm_tc;
> +}
> +
>   #endif /* __NET_TC_MIR_H */
> diff --git a/include/uapi/linux/tc_act/tc_mirred.h b/include/uapi/linux/tc_act/tc_mirred.h
> index 3d7a2b3..8ff4d76 100644
> --- a/include/uapi/linux/tc_act/tc_mirred.h
> +++ b/include/uapi/linux/tc_act/tc_mirred.h
> @@ -9,6 +9,10 @@
>   #define TCA_EGRESS_MIRROR 2 /* mirror packet to EGRESS */
>   #define TCA_INGRESS_REDIR 3  /* packet redirect to INGRESS*/
>   #define TCA_INGRESS_MIRROR 4 /* mirror packet to INGRESS */
> +
> +#define MIRRED_F_TC_MAP		0x1
> +#define MIRRED_TC_MAP_MAX	0x10

Assuming this is the max number of queues?
Where does this upper bound come from? Is it a spec
or an intel thing? If spec - mentioning which
spec and section would be useful.

cheers,
jamal