Subject: Hello Netdev,
I am working on WireGuard as part of Google Summer of Code and Jason and I are working on adding GRO to WireGuard, on the udp_tunnel side of things. The goal is to inform udp_tunnel’s gro_receive that certain packets are part of the same flow. Then sometime later, we’d like to have a list of those same-flow packets appear in gro_complete. As far as I can tell, the API seems well suited for merging packets in gro_receive, such that gro_complete only then gets one single merged packet. However, we need to receive the entire list of same-flow packets in gro_complete, unmerged. Is this possible with the present APIs? The goal of this, by the way, is to have more efficient clumping in multi-core packet decryption, similar to what’s done using GSO on the send/encryption side. See Jason’s netdevconf presentation for details on this: https://www.wireguard.com/papers/wireguard-netdev22.pdf (section “Generic Segmentation Offload Batching”). Thanks, -G
