RE: [EXTERNAL] [RFC 05/32] bus/vmbus: replace SMP barriers with C11 memory fences

---
 drivers/bus/vmbus/vmbus_bufring.c | 6 +++---
drivers/bus/vmbus/vmbus_channel.c | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/bus/vmbus/vmbus_bufring.c

b/drivers/bus/vmbus/vmbus_bufring.c
index f622869974..31478d3bfa 100644

--- a/drivers/bus/vmbus/vmbus_bufring.c
+++ b/drivers/bus/vmbus/vmbus_bufring.c

@@ -58,11 +58,11 @@ void vmbus_br_setup(struct vmbus_br *br, void *buf,

unsigned int blen)  static inline bool  vmbus_txbr_need_signal(const struct
vmbus_bufring *vbr, uint32_t old_windex)  {
-	rte_smp_mb();
+	rte_atomic_thread_fence(rte_memory_order_seq_cst);
 	if (vbr->imask)
 		return false;

-	rte_smp_rmb();
+	rte_atomic_thread_fence(rte_memory_order_acquire);

 	/*
 	 * This is the only case we need to signal when the @@ -158,7 +158,7

@@ vmbus_txbr_write(struct vmbus_br *tbr, const struct iovec iov[], int

iovlen,
 	RTE_ASSERT(windex == next_windex);

 	/* Ensure that data is available before updating host index */
-	rte_smp_wmb();
+	rte_atomic_thread_fence(rte_memory_order_release);

 	/* Checkin for our reservation. wait for our turn to update host */
 	while (!rte_atomic32_cmpset(&vbr->windex, old_windex,
next_windex)) diff --git a/drivers/bus/vmbus/vmbus_channel.c
b/drivers/bus/vmbus/vmbus_channel.c
index 2648d8e3fd..10293f59be 100644

--- a/drivers/bus/vmbus/vmbus_channel.c
+++ b/drivers/bus/vmbus/vmbus_channel.c

@@ -211,7 +211,7 @@ bool rte_vmbus_chan_rx_empty(const struct

vmbus_channel *channel)  {
 	const struct vmbus_br *br = &channel->rxbr;

-	rte_smp_rmb();
+	rte_atomic_thread_fence(rte_memory_order_acquire);
 	return br->vbr->rindex == br->vbr->windex;  }

@@ -229,13 +229,13 @@ void rte_vmbus_chan_signal_read(struct

rte_vmbus_device *dev,
 		return;

 	/* Make sure reading of pending happens after new read index */
-	rte_smp_mb();
+	rte_atomic_thread_fence(rte_memory_order_seq_cst);

 	pending_sz = rbr->vbr->pending_send;
 	if (!pending_sz)
 		return;

-	rte_smp_rmb();
+	rte_atomic_thread_fence(rte_memory_order_acquire);
 	write_sz = vmbus_br_availwrite(rbr, rbr->vbr->windex);

 	/* If there was space before then host was not blocked */
--
2.53.0