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SubjectRe: [RFC net-next Patch v2 4/4] net: bridge: mrp: switchdev: Add HW offload
On Mon, Jan 13, 2020 at 01:46:20PM +0100, Horatiu Vultur wrote:
> +#ifdef CONFIG_BRIDGE_MRP
> +/* SWITCHDEV_OBJ_ID_PORT_MRP */
> +struct switchdev_obj_port_mrp {
> + struct switchdev_obj obj;
> + struct net_device *port;
> + u32 ring_nr;
> +};
> +
> +#define SWITCHDEV_OBJ_PORT_MRP(OBJ) \
> + container_of((OBJ), struct switchdev_obj_port_mrp, obj)
> +
> +/* SWITCHDEV_OBJ_ID_RING_TEST_MRP */
> +struct switchdev_obj_ring_test_mrp {
> + struct switchdev_obj obj;
> + /* The value is in us and a value of 0 represents to stop */
> + u32 interval;
> + u8 max;
> + u32 ring_nr;
> +};
> +
> +#define SWITCHDEV_OBJ_RING_TEST_MRP(OBJ) \
> + container_of((OBJ), struct switchdev_obj_ring_test_mrp, obj)
> +
> +/* SWITCHDEV_OBJ_ID_RING_ROLE_MRP */
> +struct switchdev_obj_ring_role_mrp {
> + struct switchdev_obj obj;
> + u8 ring_role;
> + u32 ring_nr;
> +};

Hi Horatiu

The structures above should give me enough information to build this,
correct?

Ethernet II, Src: 7a:8b:b1:35:96:e1 (7a:8b:b1:35:96:e1), Dst: Iec_00:00:01 (01:15:4e:00:00:01)
Destination: Iec_00:00:01 (01:15:4e:00:00:01)
Source: 7a:8b:b1:35:96:e1 (7a:8b:b1:35:96:e1)
Type: MRP (0x88e3)
PROFINET MRP MRP_Test, MRP_Common, MRP_End
MRP_Version: 1
MRP_TLVHeader.Type: MRP_Test (0x02)
MRP_TLVHeader.Type: MRP_Test (0x02)
MRP_TLVHeader.Length: 18
MRP_Prio: 0x1f40 High priorities
MRP_SA: 7a:8b:b1:35:96:e1 (7a:8b:b1:35:96:e1)
MRP_PortRole: Primary ring port (0x0000)
MRP_RingState: Ring closed (0x0001)
MRP_Transition: 0x0001
MRP_TimeStamp [ms]: 0x000cf574 <---------- Updated automatic
MRP_TLVHeader.Type: MRP_Common (0x01)
MRP_TLVHeader.Type: MRP_Common (0x01)
MRP_TLVHeader.Length: 18
MRP_SequenceID: 0x00e9 <---------- Updated automatic
MRP_DomainUUID: ffffffff-ffff-ffff-ffff-ffffffffffff
MRP_TLVHeader.Type: MRP_End (0x00)
MRP_TLVHeader.Type: MRP_End (0x00)
MRP_TLVHeader.Length: 0

There are a couple of fields i don't see. MRP_SA, MRP_Transition.

What are max and ring_nr used for?

Do you need to set the first value MRP_SequenceID uses? Often, in
order to detect a reset, a random value is used to initialise the
sequence number. Also, does the time stamp need initializing?

Thanks
Andrew

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