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SubjectRe: [RFC net-next v4 8/9] bridge: mrp: Integrate MRP into the bridge
The 04/01/2020 19:33, Nikolay Aleksandrov wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On 01/04/2020 19:10, Horatiu Vultur wrote:
> > Hi Nik,
> >
> > The 03/30/2020 19:16, Nikolay Aleksandrov wrote:
> >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >>
> >> On 27/03/2020 11:21, Horatiu Vultur wrote:
> >>> To integrate MRP into the bridge, the bridge needs to do the following:
> >>> - add new flag(BR_MPP_AWARE) to the net bridge ports, this bit will be set when
> >>> the port is added to an MRP instance. In this way it knows if the frame was
> >>> received on MRP ring port
> >>> - detect if the MRP frame was received on MRP ring port in that case it would be
> >>> processed otherwise just forward it as usual.
> >>> - enable parsing of MRP
> >>> - before whenever the bridge was set up, it would set all the ports in
> >>> forwarding state. Add an extra check to not set ports in forwarding state if
> >>> the port is an MRP ring port. The reason of this change is that if the MRP
> >>> instance initially sets the port in blocked state by setting the bridge up it
> >>> would overwrite this setting.
> >>>
> >>> Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
> >>> ---
> >>> include/linux/if_bridge.h | 1 +
> >>> net/bridge/br_device.c | 3 +++
> >>> net/bridge/br_input.c | 3 +++
> >>> net/bridge/br_netlink.c | 5 +++++
> >>> net/bridge/br_private.h | 22 ++++++++++++++++++++++
> >>> net/bridge/br_stp.c | 6 ++++++
> >>> 6 files changed, 40 insertions(+)
> >>>
> >>> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> >>> index 9e57c4411734..10baa9efdae8 100644
> >>> --- a/include/linux/if_bridge.h
> >>> +++ b/include/linux/if_bridge.h
> >>> @@ -47,6 +47,7 @@ struct br_ip_list {
> >>> #define BR_BCAST_FLOOD BIT(14)
> >>> #define BR_NEIGH_SUPPRESS BIT(15)
> >>> #define BR_ISOLATED BIT(16)
> >>> +#define BR_MRP_AWARE BIT(17)
> >>>
> >>> #define BR_DEFAULT_AGEING_TIME (300 * HZ)
> >>>
> >>> diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
> >>> index 0e3dbc5f3c34..8ec1362588af 100644
> >>> --- a/net/bridge/br_device.c
> >>> +++ b/net/bridge/br_device.c
> >>> @@ -463,6 +463,9 @@ void br_dev_setup(struct net_device *dev)
> >>> spin_lock_init(&br->lock);
> >>> INIT_LIST_HEAD(&br->port_list);
> >>> INIT_HLIST_HEAD(&br->fdb_list);
> >>> +#if IS_ENABLED(CONFIG_BRIDGE_MRP)
> >>> + INIT_LIST_HEAD(&br->mrp_list);
> >>> +#endif
> >>> spin_lock_init(&br->hash_lock);
> >>>
> >>> br->bridge_id.prio[0] = 0x80;
> >>> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> >>> index fcc260840028..d5c34f36f0f4 100644
> >>> --- a/net/bridge/br_input.c
> >>> +++ b/net/bridge/br_input.c
> >>> @@ -342,6 +342,9 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
> >>> }
> >>> }
> >>>
> >>> + if (unlikely(br_mrp_process(p, skb)))
> >>> + return RX_HANDLER_PASS;
> >>> +
> >>> forward:
> >>> switch (p->state) {
> >>> case BR_STATE_FORWARDING:
> >>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> >>> index 43dab4066f91..77bc96745be6 100644
> >>> --- a/net/bridge/br_netlink.c
> >>> +++ b/net/bridge/br_netlink.c
> >>> @@ -669,6 +669,11 @@ static int br_afspec(struct net_bridge *br,
> >>> if (err)
> >>> return err;
> >>> break;
> >>> + case IFLA_BRIDGE_MRP:
> >>> + err = br_mrp_parse(br, p, attr, cmd);
> >>> + if (err)
> >>> + return err;
> >>> + break;
> >>> }
> >>> }
> >>>
> >>> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> >>> index 1f97703a52ff..38894f2cf98f 100644
> >>> --- a/net/bridge/br_private.h
> >>> +++ b/net/bridge/br_private.h
> >>> @@ -428,6 +428,10 @@ struct net_bridge {
> >>> int offload_fwd_mark;
> >>> #endif
> >>> struct hlist_head fdb_list;
> >>> +
> >>> +#if IS_ENABLED(CONFIG_BRIDGE_MRP)
> >>> + struct list_head __rcu mrp_list;
> >>> +#endif
> >>> };
> >>>
> >>> struct br_input_skb_cb {
> >>> @@ -1304,6 +1308,24 @@ unsigned long br_timer_value(const struct timer_list *timer);
> >>> extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
> >>> #endif
> >>>
> >>> +/* br_mrp.c */
> >>> +#if IS_ENABLED(CONFIG_BRIDGE_MRP)
> >>> +int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
> >>> + struct nlattr *attr, int cmd);
> >>> +int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
> >>> +#else
> >>> +static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
> >>> + struct nlattr *attr, int cmd)
> >>> +{
> >>> + return -1;
> >>
> >> You should return proper error here.
> >
> > It will return -EOPNOTSUPP.
> >
> >>
> >>> +}
> >>> +
> >>> +static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
> >>> +{
> >>> + return -1;
> >>
> >> The bridge can't possibly work with MRP disabled with this.
> >
> > Good catch, it will return 0.
> >
> >>
> >>> +}
> >>> +#endif
> >>> +
> >>> /* br_netlink.c */
> >>> extern struct rtnl_link_ops br_link_ops;
> >>> int br_netlink_init(void);
> >>> diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
> >>> index 1f14b8455345..3e88be7aa269 100644
> >>> --- a/net/bridge/br_stp.c
> >>> +++ b/net/bridge/br_stp.c
> >>> @@ -36,6 +36,12 @@ void br_set_state(struct net_bridge_port *p, unsigned int state)
> >>> };
> >>> int err;
> >>>
> >>> + /* Don't change the state of the ports if they are driven by a different
> >>> + * protocol.
> >>> + */
> >>> + if (p->flags & BR_MRP_AWARE)
> >>> + return;
> >>> +
> >>
> >> Maybe disallow STP type (kernel/user-space/no-stp) changing as well, force it to no-stp.
> >
> > I am not sure that I understand completely here, do you want me to
> > disable STP if MRP is started?
> >
>
> I think it should be one of the two since they can step on each other's toes. If MRP is
> enabled then STP must be already disabled and should not be possible to enable while MRP
> is active and vice-versa.

I will update this in the next patch series.

>
> >>
> >>> p->state = state;
> >>> err = switchdev_port_attr_set(p->dev, &attr);
> >>> if (err && err != -EOPNOTSUPP)
> >>>
> >>
> >
>

--
/Horatiu

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