i40e_asq_send_command: rd32 & wr32 under ThunderX gives unpredictable
results. To solve this include rte memory barriers
Signed-off-by: Satha Rao <skoteshwar at caviumnetworks.com>
---
drivers/net/i40e/base/i40e_adminq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/i40e/base/i40e_adminq.c
b/drivers/net/i40e/base/i40e_adminq.c
index 0d3a83f..1038a95 100644
--- a/drivers/net/i40e/base/i40e_adminq.c
+++ b/drivers/net/i40e/base/i40e_adminq.c
@@ -832,6 +832,7 @@ enum i40e_status_code i40e_asq_send_command(struct i40e_hw
*hw,
}
val = rd32(hw, hw->aq.asq.head);
+ rte_rmb();
if (val >= hw->aq.num_asq_entries) {
i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
"AQTX: head overrun at %d\n", val);
@@ -929,8 +930,10 @@ enum i40e_status_code i40e_asq_send_command(struct i40e_hw
*hw,
(hw->aq.asq.next_to_use)++;
if (hw->aq.asq.next_to_use == hw->aq.asq.count)
hw->aq.asq.next_to_use = 0;
- if (!details->postpone)
+ if (!details->postpone) {
wr32(hw, hw->aq.asq.tail, hw->aq.asq.next_to_use);
+ rte_wmb();
+ }
/* if cmd_details are not defined or async flag is not set,
* we need to wait for desc write back
--
2.7.4
