netdev - [PATCH v2] Allow UDP cmsghdrs through io

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Message-Id: <20201213203112.24152-1-v@nametag.social>
Date:   Sun, 13 Dec 2020 20:31:11 +0000
From:   Victor Stewart <v@...etag.social>
To:     io-uring@...r.kernel.org, soheil@...gle.com,
        netdev@...r.kernel.org, jannh@...gle.com
Subject: [PATCH v2] Allow UDP cmsghdrs through io_uring

This patch adds PROTO_CMSG_DATA_ONLY to inet_dgram_ops and inet6_dgram_ops so that UDP_SEGMENT (GSO) and UDP_GRO can be used through io_uring.

GSO and GRO are vital to bring QUIC servers on par with TCP throughputs, and together offer a higher
throughput gain than io_uring alone (rate of data transit
considering), thus io_uring is presently the lesser performance choice.

RE http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf,
GSO is about +~63% and GRO +~82%.

this patch closes that loophole. 

net/ipv4/af_inet.c  | 1 +
net/ipv6/af_inet6.c | 1 +
net/socket.c        | 8 +++++---
3 files changed, 7 insertions(+), 3 deletions(-)