linux-kernel - [PATCH net v2 0/2] vsock: Fix SO

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Message-Id: <20251229-vsock-child-sock-custom-sockopt-v2-0-64778d6c4f88@rbox.co>
Date: Mon, 29 Dec 2025 20:43:09 +0100
From: Michal Luczaj <mhal@...x.co>
To: Stefano Garzarella <sgarzare@...hat.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, 
 Arseniy Krasnov <avkrasnov@...utedevices.com>
Cc: virtualization@...ts.linux.dev, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Michal Luczaj <mhal@...x.co>
Subject: [PATCH net v2 0/2] vsock: Fix SO_ZEROCOPY on accept()ed vsocks

vsock has its own handling of setsockopt(SO_ZEROCOPY). Which works just
fine unless socket comes from a call to accept(). Because
SOCK_CUSTOM_SOCKOPT flag is missing, attempting to set the option always
results in errno EOPNOTSUPP.

Signed-off-by: Michal Luczaj <mhal@...x.co>
---
Changes in v2:
- Fix: set socket flags in a consistent way [Stefano]
- Test: simplify sync by removing sync [Stefano]
- Link to v1: https://lore.kernel.org/r/20251223-vsock-child-sock-custom-sockopt-v1-0-4654a75d0f58@rbox.co

---
Michal Luczaj (2):
      vsock: Make accept()ed sockets use custom setsockopt()
      vsock/test: Test setting SO_ZEROCOPY on accept()ed socket

 net/vmw_vsock/af_vsock.c         |  4 ++++
 tools/testing/vsock/vsock_test.c | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
---
base-commit: 58fc7342b529803d3c221101102fe913df7adb83
change-id: 20251222-vsock-child-sock-custom-sockopt-23b779c30c8f

Best regards,
-- 
Michal Luczaj <mhal@...x.co>