RE: [PATCH v1 1/3] ethdev: add flow item for RoCE infiniband BTH

[Ori Kam <orika@nvidia.com>]

Hi Bill,

> -----Original Message-----
> From: Bill Zhou <dongzhou@nvidia.com>
> Sent: Thursday, May 11, 2023 10:55 AM
> Subject: [PATCH v1 1/3] ethdev: add flow item for RoCE infiniband BTH
> 
> IB(InfiniBand) is one type of networking used in high-performance
> computing with high throughput and low latency. Like Ethernet,
> IB defines a layered protocol (Physical, Link, Network, Transport
> Layers). IB provides native support for RDMA(Remote DMA), an
> extension of the DMA that allows direct access to remote host
> memory without CPU intervention. IB network requires NICs and
> switches to support the IB protocol.
> 
> RoCE(RDMA over Converged Ethernet) is a network protocol that
> allows RDMA to run on Ethernet. RoCE encapsulates IB packets on
> ethernet and has two versions, RoCEv1 and RoCEv2. RoCEv1 is an
> ethernet link layer protocol, IB packets are encapsulated in the
> ethernet layer and use ethernet type 0x8915. RoCEv2 is an internet
> layer protocol, IB packets are encapsulated in UDP payload and
> use a destination port 4791, The format of the RoCEv2 packet is
> as follows:
>   ETH + IP + UDP(dport 4791) + IB(BTH + ExtHDR + PAYLOAD + CRC)
> 
> BTH(Base Transport Header) is the IB transport layer header, RoCEv1
> and RoCEv2 both contain this header. This patch introduces a new
> RTE item to match the IB BTH in RoCE packets. One use of this match
> is that the user can monitor RoCEv2's CNP(Congestion Notification
> Packet) by matching BTH opcode 0x81.
> 
> This patch also adds the testpmd command line to match the RoCEv2
> BTH. Usage example:
> 
>   testpmd> flow create 0 group 1 ingress pattern
>            eth / ipv4 / udp dst is 4791 / ib_bth opcode is 0x81
>            dst_qp is 0xd3 / end actions queue index 0 / end
> 
> Signed-off-by: Dong Zhou <dongzhou@nvidia.com>
> ---

Acked-by: Ori Kam <orika@nvidia.com>
Best,
Ori