diff mbox series

[v1,4/4] net/virtio: replace full barrier with thread fence

Message ID 20201221142321.51606-5-joyce.kong@arm.com (mailing list archive)
State Accepted, archived
Delegated to: Maxime Coquelin
Headers
Series replace smp barriers in virtio with C11 atomic |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/iol-broadcom-Performance success Performance Testing PASS
ci/iol-broadcom-Functional success Functional Testing PASS
ci/iol-intel-Functional success Functional Testing PASS
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-abi-testing success Testing PASS
ci/iol-testing success Testing PASS

Commit Message

Joyce Kong Dec. 21, 2020, 2:23 p.m. UTC 
  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>
---
 drivers/net/virtio/virtqueue.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Comments

Maxime Coquelin Jan. 7, 2021, 4:28 p.m. UTC | #1 
On 12/21/20 3:23 PM, Joyce Kong wrote:
> 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>
> ---
>  drivers/net/virtio/virtqueue.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
diff mbox series

Patch

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index ac3d9e750..d78b94344 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -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();
 }