[PATCH 15/25] common/idpf: add wmb before tail

[Soumyadeep Hore <soumyadeep.hore@intel.com>]

Introduced through customer's feedback in their attempt to address some
bugs this introduces a memory barrier before posting ctlq tail. This
makes sure memory writes have a chance to take place before HW starts
messing with the descriptors.

Signed-off-by: Soumyadeep Hore <soumyadeep.hore@intel.com>
---
 drivers/common/idpf/base/idpf_controlq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/common/idpf/base/idpf_controlq.c b/drivers/common/idpf/base/idpf_controlq.c
index d2e9fdc06d..6807e83f18 100644
--- a/drivers/common/idpf/base/idpf_controlq.c
+++ b/drivers/common/idpf/base/idpf_controlq.c
@@ -625,6 +625,8 @@ int idpf_ctlq_post_rx_buffs(struct idpf_hw *hw, struct idpf_ctlq_info *cq,
 			/* Wrap to end of end ring since current ntp is 0 */
 			cq->next_to_post = cq->ring_size - 1;
 
+		idpf_wmb();
+
 		wr32(hw, cq->reg.tail, cq->next_to_post);
 	}
 
-- 
2.43.0