linux-kernel - [PATCH net 0/2] vsock: Fix SO_ZEROCOPY on accept()ed vsocks

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Message-Id: <20251223-vsock-child-sock-custom-sockopt-v1-0-4654a75d0f58@rbox.co>
Date: Tue, 23 Dec 2025 10:15:27 +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 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>
---
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         |  1 +
 tools/testing/vsock/vsock_test.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
---
base-commit: 5e7365b5a1ac8f517a7a84442289d7de242deb76
change-id: 20251222-vsock-child-sock-custom-sockopt-23b779c30c8f

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