linux-kernel - Re: [PATCH net-next 1/2] bridge: mrp: Set the priority of MRP instance

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Message-ID: <fc47aca8-a188-5e57-fe76-8e57c2910920@cumulusnetworks.com>
Date:   Fri, 29 May 2020 11:12:06 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        roopa@...ulusnetworks.com, jiri@...nulli.us, ivecera@...hat.com,
        davem@...emloft.net, kuba@...nel.org, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 1/2] bridge: mrp: Set the priority of MRP
 instance

On 29/05/2020 13:05, Horatiu Vultur wrote:
> Each MRP instance has a priority, a lower value means a higher priority.
> The priority of MRP instance is stored in MRP_Test frame in this way
> all the MRP nodes in the ring can see other nodes priority.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  include/net/switchdev.h        | 1 +
>  include/uapi/linux/if_bridge.h | 2 ++
>  net/bridge/br_mrp.c            | 3 ++-
>  net/bridge/br_mrp_netlink.c    | 5 +++++
>  net/bridge/br_mrp_switchdev.c  | 1 +
>  net/bridge/br_private_mrp.h    | 1 +
>  6 files changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
> index db519957e134b..f82ef4c45f5ed 100644
> --- a/include/net/switchdev.h
> +++ b/include/net/switchdev.h
> @@ -116,6 +116,7 @@ struct switchdev_obj_mrp {
>  	struct net_device *p_port;
>  	struct net_device *s_port;
>  	u32 ring_id;
> +	u16 prio;
>  };
>  
>  #define SWITCHDEV_OBJ_MRP(OBJ) \
> diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
> index 5a43eb86c93bf..0162c1370ecb6 100644
> --- a/include/uapi/linux/if_bridge.h
> +++ b/include/uapi/linux/if_bridge.h
> @@ -176,6 +176,7 @@ enum {
>  	IFLA_BRIDGE_MRP_INSTANCE_RING_ID,
>  	IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX,
>  	IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX,
> +	IFLA_BRIDGE_MRP_INSTANCE_PRIO,
>  	__IFLA_BRIDGE_MRP_INSTANCE_MAX,
>  };
>  
> @@ -230,6 +231,7 @@ struct br_mrp_instance {
>  	__u32 ring_id;
>  	__u32 p_ifindex;
>  	__u32 s_ifindex;
> +	__u16 prio;
>  };
>  
>  struct br_mrp_ring_state {
> diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
> index 8ea59504ef47a..f8fd037219fe9 100644
> --- a/net/bridge/br_mrp.c
> +++ b/net/bridge/br_mrp.c
> @@ -147,7 +147,7 @@ static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp,
>  	br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr));
>  	hdr = skb_put(skb, sizeof(*hdr));
>  
> -	hdr->prio = cpu_to_be16(MRP_DEFAULT_PRIO);
> +	hdr->prio = cpu_to_be16(mrp->prio);
>  	ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
>  	hdr->port_role = cpu_to_be16(port_role);
>  	hdr->state = cpu_to_be16(mrp->ring_state);
> @@ -290,6 +290,7 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
>  		return -ENOMEM;
>  
>  	mrp->ring_id = instance->ring_id;
> +	mrp->prio = instance->prio;
>  
>  	p = br_mrp_get_port(br, instance->p_ifindex);
>  	spin_lock_bh(&br->lock);
> diff --git a/net/bridge/br_mrp_netlink.c b/net/bridge/br_mrp_netlink.c
> index d9de780d2ce06..332d9894a9485 100644
> --- a/net/bridge/br_mrp_netlink.c
> +++ b/net/bridge/br_mrp_netlink.c
> @@ -22,6 +22,7 @@ br_mrp_instance_policy[IFLA_BRIDGE_MRP_INSTANCE_MAX + 1] = {
>  	[IFLA_BRIDGE_MRP_INSTANCE_RING_ID]	= { .type = NLA_U32 },
>  	[IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX]	= { .type = NLA_U32 },
>  	[IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX]	= { .type = NLA_U32 },
> +	[IFLA_BRIDGE_MRP_INSTANCE_PRIO]		= { .type = NLA_U16 },
>  };
>  
>  static int br_mrp_instance_parse(struct net_bridge *br, struct nlattr *attr,
> @@ -49,6 +50,10 @@ static int br_mrp_instance_parse(struct net_bridge *br, struct nlattr *attr,
>  	inst.ring_id = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_RING_ID]);
>  	inst.p_ifindex = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX]);
>  	inst.s_ifindex = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX]);
> +	inst.prio = MRP_DEFAULT_PRIO;
> +
> +	if (tb[IFLA_BRIDGE_MRP_INSTANCE_PRIO])
> +		inst.prio = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_PRIO]);

	[IFLA_BRIDGE_MRP_INSTANCE_PRIO]		= { .type = NLA_U16 },

it seems you should be using nla_get_u16 above

>  
>  	if (cmd == RTM_SETLINK)
>  		return br_mrp_add(br, &inst);
> diff --git a/net/bridge/br_mrp_switchdev.c b/net/bridge/br_mrp_switchdev.c
> index 51cb1d5a24b4f..3a776043bf80d 100644
> --- a/net/bridge/br_mrp_switchdev.c
> +++ b/net/bridge/br_mrp_switchdev.c
> @@ -12,6 +12,7 @@ int br_mrp_switchdev_add(struct net_bridge *br, struct br_mrp *mrp)
>  		.p_port = rtnl_dereference(mrp->p_port)->dev,
>  		.s_port = rtnl_dereference(mrp->s_port)->dev,
>  		.ring_id = mrp->ring_id,
> +		.prio = mrp->prio,
>  	};
>  	int err;
>  
> diff --git a/net/bridge/br_private_mrp.h b/net/bridge/br_private_mrp.h
> index a0f53cc3ab85c..558941ce23669 100644
> --- a/net/bridge/br_private_mrp.h
> +++ b/net/bridge/br_private_mrp.h
> @@ -14,6 +14,7 @@ struct br_mrp {
>  	struct net_bridge_port __rcu	*s_port;
>  
>  	u32				ring_id;
> +	u16				prio;
>  
>  	enum br_mrp_ring_role_type	ring_role;
>  	u8				ring_role_offloaded;
>