[RFC 21/32] mempool/octeontx: use IO barrier in pool destroy

[Stephen Hemminger <stephen@networkplumber.org>]

The barrier flushes outstanding writes to the FPA pool before the
teardown mailbox sequence. That is ordering against the device, so
use rte_io_wmb(). Control path.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/mempool/octeontx/octeontx_fpavf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mempool/octeontx/octeontx_fpavf.c b/drivers/mempool/octeontx/octeontx_fpavf.c
index 6cd0fc057f..7051422cb7 100644
--- a/drivers/mempool/octeontx/octeontx_fpavf.c
+++ b/drivers/mempool/octeontx/octeontx_fpavf.c
@@ -616,8 +616,8 @@ octeontx_fpa_bufpool_destroy(uintptr_t handle, int node_id)
 
 	RTE_SET_USED(node_id);
 
-	/* Wait for all outstanding writes to be committed */
-	rte_smp_wmb();
+	/* Make outstanding pool writes visible to the device */
+	rte_io_wmb();
 
 	if (unlikely(!octeontx_fpa_handle_valid(handle)))
 		return -EINVAL;
-- 
2.53.0