d/numam-dpdk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

vhost: relax full barriers for used idx

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/librte_vhost/vdpa.c
View File

@ -217,8 +217,8 @@ rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
idx++;
}
rte_smp_wmb();
vq->used->idx = idx_m;
/* used idx is the synchronization point for the split vring */
__atomic_store_n(&vq->used->idx, idx_m, __ATOMIC_RELEASE);
if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
vring_used_event(s_vring) = idx_m;