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net/virtio: replace full barrier with thread fence

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Replace the smp barriers with atomic thread fence for synchronization
between different threads, if there are no load/store operations.

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 22:23:21 +08:00 committed by Ferruh Yigit
parent e51a474ced
commit 240a9941d4
1 changed files with 4 additions and 4 deletions
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8
drivers/net/virtio/virtqueue.h
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@ -26,7 +26,7 @@ struct rte_mbuf;
/*
* Per virtio_ring.h in Linux.
* For virtio_pci on SMP, we don't need to order with respect to MMIO
* accesses through relaxed memory I/O windows, so smp_mb() et al are
* accesses through relaxed memory I/O windows, so thread_fence is
* sufficient.
*
* For using virtio to talk to real devices (eg. vDPA) we do need real
@ -36,7 +36,7 @@ static inline void
virtio_mb(uint8_t weak_barriers)
{
if (weak_barriers)
rte_smp_mb();
rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
else
rte_mb();
}
@ -45,7 +45,7 @@ static inline void
virtio_rmb(uint8_t weak_barriers)
{
if (weak_barriers)
rte_smp_rmb();
rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
else
rte_io_rmb();
}
@ -54,7 +54,7 @@ static inline void
virtio_wmb(uint8_t weak_barriers)
{
if (weak_barriers)
rte_smp_wmb();
rte_atomic_thread_fence(__ATOMIC_RELEASE);
else
rte_io_wmb();
}