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vhost: relax full barriers for used idx

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Used idx can be synchronized by one-way barrier instead of full
write barrier for split vring.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Joyce Kong 2020-12-21 23:50:31 +08:00 committed by Ferruh Yigit
parent 9253c34cfb
commit 10b8c36af0
1 changed files with 2 additions and 2 deletions
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4
lib/librte_vhost/vdpa.c
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@ -217,8 +217,8 @@ rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
idx++; idx++;
} }
rte_smp_wmb(); /* used idx is the synchronization point for the split vring */
vq->used->idx = idx_m; __atomic_store_n(&vq->used->idx, idx_m, __ATOMIC_RELEASE);
if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
vring_used_event(s_vring) = idx_m; vring_used_event(s_vring) = idx_m;