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authorLaurent Vivier <lvivier@redhat.com>2025-05-21 11:22:36 +0200
committerPaolo Abeni <pabeni@redhat.com>2025-07-03 11:40:02 +0200
commit24b2f5df86aaebbe7bac40304eaf5a146c02367c (patch)
tree27c56a662c6e7a5530d251c88cfec275738b98d6 /scripts/lib/kdoc/kdoc_files.py
parentbd2948d2581ebd31745c1b7094a470513789555f (diff)
virtio_net: Enforce minimum TX ring size for reliability
The `tx_may_stop()` logic stops TX queues if free descriptors (`sq->vq->num_free`) fall below the threshold of (`MAX_SKB_FRAGS` + 2). If the total ring size (`ring_num`) is not strictly greater than this value, queues can become persistently stopped or stop after minimal use, severely degrading performance. A single sk_buff transmission typically requires descriptors for: - The virtio_net_hdr (1 descriptor) - The sk_buff's linear data (head) (1 descriptor) - Paged fragments (up to MAX_SKB_FRAGS descriptors) This patch enforces that the TX ring size ('ring_num') must be strictly greater than (MAX_SKB_FRAGS + 2). This ensures that the ring is always large enough to hold at least one maximally-fragmented packet plus at least one additional slot. Reported-by: Lei Yang <leiyang@redhat.com> Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Link: https://patch.msgid.link/20250521092236.661410-4-lvivier@redhat.com Tested-by: Lei Yang <leiyang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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