linux-kernel - [PATCH net 0/4] virtio-net: fixes for mergeable XDP receive path

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Message-ID: <20250625160849.61344-1-minhquangbui99@gmail.com>
Date: Wed, 25 Jun 2025 23:08:45 +0700
From: Bui Quang Minh <minhquangbui99@...il.com>
To: netdev@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	Bui Quang Minh <minhquangbui99@...il.com>
Subject: [PATCH net 0/4] virtio-net: fixes for mergeable XDP receive path

Hi everyone,

This series contains fixes for XDP receive path in virtio-net
- Patch 1: add a missing check for the received data length with our
allocated buffer size in mergeable mode
- Patch 2: remove a redundant truesize check with PAGE_SIZE in mergeable
mode
- Patch 3: add a helper for mergeable received data length check to avoid
repeated code
- Patch 4: fix the flaky drivers/net/ping.py selftest due to frame drop
when the receive buffer is prefilled before XDP is set but is used after
XDP is set. It's because of current restriction that
headroom + frame's length + tailroom < PAGE_SIZE. XDP does not have this
restriction, so we can lift the restriction here and continue processing
the frame.

Thanks,
Quang Minh.

Bui Quang Minh (4):
  virtio-net: ensure the received length does not exceed allocated size
  virtio-net: remove redundant truesize check with PAGE_SIZE
  virtio-net: create a helper to check received mergeable buffer's
    length
  virtio-net: allow more allocated space for mergeable XDP

 drivers/net/virtio_net.c | 91 ++++++++++++++++++++++++----------------
 1 file changed, 54 insertions(+), 37 deletions(-)

-- 
2.43.0