Unlike split ring, packed ring does not mandate the ring size to be a power of 2. So we have to use a modulo operation when wrapping ring index.
Fixes: 873e8dad6f49 ("vhost: support packed ring in async datapath") Cc: sta...@dpdk.org Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com> --- V2: Also fix wrapping in virtio_dev_rx_async_get_info_idx which is used in the packed ring data path. lib/vhost/virtio_net.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c index b93482587c..0de5231db7 100644 --- a/lib/vhost/virtio_net.c +++ b/lib/vhost/virtio_net.c @@ -1470,7 +1470,7 @@ virtio_dev_rx_async_get_info_idx(uint16_t pkts_idx, uint16_t vq_size, uint16_t n_inflight) { return pkts_idx > n_inflight ? (pkts_idx - n_inflight) : - (vq_size - n_inflight + pkts_idx) & (vq_size - 1); + (vq_size - n_inflight + pkts_idx) % vq_size; } static __rte_always_inline void @@ -2131,7 +2131,7 @@ uint16_t rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id, if (vq_is_packed(dev)) { for (i = 0; i < n_pkts_put; i++) { - from = (start_idx + i) & (vq_size - 1); + from = (start_idx + i) % vq_size; n_buffers += pkts_info[from].nr_buffers; pkts[i] = pkts_info[from].mbuf; } -- 2.31.1