netdev - [PATCH net-next v2 0/2] Lift UDP_SEGMENT restriction for egress via device w/o csum offload

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Message-Id: <20240626-linux-udpgso-v2-0-422dfcbd6b48@cloudflare.com>
Date: Wed, 26 Jun 2024 19:51:25 +0200
From: Jakub Sitnicki <jakub@...udflare.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Willem de Bruijn <willemb@...gle.com>, 
 kernel-team@...udflare.com
Subject: [PATCH net-next v2 0/2] Lift UDP_SEGMENT restriction for egress
 via device w/o csum offload

This is a follow-up to an earlier question [1] if we can make UDP GSO work with
any egress device, even those with no checksum offload capability. That's the
default setup for TUN/TAP.

Because there is a change in behavior - sendmsg() does no longer return EIO
error - I'm submitting through net-next tree, rather than net, as per Willem's
advice.

[1] https://lore.kernel.org/netdev/87jzqsld6q.fsf@cloudflare.com/

To: netdev@...r.kernel.org
Cc: David S. Miller <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: kernel-team@...udflare.com
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>

Changes in v2:
- Fixup ip link arguments order (Jakub)
- Describe performance impact compared to regular sendmsg (Willem)
- Link to v1: https://lore.kernel.org/r/20240622-linux-udpgso-v1-0-d2344157ab2a@cloudflare.com

---
Jakub Sitnicki (2):
      udp: Allow GSO transmit from devices with no checksum offload
      selftests/net: Add test coverage for UDP GSO software fallback

 net/ipv4/udp.c                        |  3 +--
 net/ipv4/udp_offload.c                |  8 +++++++
 net/ipv6/udp.c                        |  3 +--
 tools/testing/selftests/net/udpgso.c  | 15 +++++++++---
 tools/testing/selftests/net/udpgso.sh | 43 +++++++++++++++++++++++++++++++++++
 5 files changed, 65 insertions(+), 7 deletions(-)