[dpdk-dev] [RFC 0/2] TAP TSO Implementation

[Ferruh Yigit]

On 3/9/2018 9:10 PM, Ophir Munk wrote:
> This RFC suggests TAP TSO (TSP segmentation offload) implementation in SW.
> It uses dpdk library rte_gso which is also used by testpmd.
> Dpdk rte_gso library segments large TCP payloads (e.g. 64K bytes)
> into smaller MTU size buffers.
> By supporting TSO offload capability in software a TAP device can be used
> as a failsafe sub device and be paired with another PCI device which
> supports TSO capability in HW.
> 
> This RFC includes 2 commits:
> 1. Calculation of IP/TCP/UDP checksums for multi segments packets.
> Previously checksum offload was skipped if the number of packet segments
> was greater than 1.
> This commit removes this limitation. It is required before supporting TAP TSO
> since the generated small TCP packets may be composed by themselves by more than
> one segment.
> 2. Core TAP TSO implementation: calling rte_gso_segment() segments
> large TCP packets.
> To be added: creation of a small private mbuf pool in TAP required by librte_gso.
> The number of buffers will be 64 - each of 128 bytes length.
> 
> Ophir Munk (2):
>   net/tap: calculate checksum for multi segs packets
>   net/tap: implement TAP TSO

This is an RFC, and V1 not sent for the patch, is this still valid for this
release or should we push into next one?