linux-kernel - [PATCH 0/2] virtio: Fixes for TX ring sizing and resize error reporting

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Message-ID: <20250520110526.635507-1-lvivier@redhat.com>
Date: Tue, 20 May 2025 13:05:24 +0200
From: Laurent Vivier <lvivier@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	netdev@...r.kernel.org,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [PATCH 0/2] virtio: Fixes for TX ring sizing and resize error reporting

This patch series contains two fixes for the virtio subsystem.

The first patch fixes an error reporting bug in virtio_ring's
virtqueue_resize() function. Previously, errors from internal resize
helpers could be masked if the subsequent re-enabling of the virtqueue
succeeded. This patch restores the correct error propagation, ensuring that
callers of virtqueue_resize() are properly informed of underlying resize
failures.

The second patch addresses a reliability issue in virtio_net where the TX
ring size could be configured too small, potentially leading to
persistently stopped queues and degraded performance. It enforces a
minimum TX ring size to ensure there's always enough space for at least one
maximally-fragmented packet plus an additional slot.

Laurent Vivier (2):
  virtio_ring: Fix error reporting in virtqueue_resize
  virtio_net: Enforce minimum TX ring size for reliability

 drivers/net/virtio_net.c     | 6 ++++++
 drivers/virtio/virtio_ring.c | 8 ++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

-- 
2.49.0