[dpdk-dev] [PATCH v2] net/i40e: fix DCB init issue

[Shougang Wang <shougangx.wang@intel.com>]

Stopping lldp is necessary for DPDK, but it will cause DCB init failed.
For kernel shared code, the prerequisite for successful initialization
of DCB is that LLDP is enabled. This patch starts lldp before DCB init
and stops it when finish init.

Fixes: a8e84b22bd55 ("net/i40e/base: support persistent LLDP")
Cc: stable@dpdk.org

Signed-off-by: Shougang Wang <shougangx.wang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 9fbda1c34..9459b520c 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -11669,11 +11669,15 @@ i40e_dcb_init_configure(struct rte_eth_dev *dev, bool sw_dcb)
 	 * LLDP MIB change event.
 	 */
 	if (sw_dcb == TRUE) {
-		if (i40e_need_stop_lldp(dev)) {
-			ret = i40e_aq_stop_lldp(hw, TRUE, TRUE, NULL);
-			if (ret != I40E_SUCCESS)
-				PMD_INIT_LOG(DEBUG, "Failed to stop lldp");
-		}
+		/* Stopping lldp is necessary for DPDK, but it will cause
+		 * DCB init failed. For i40e_init_dcb(), the prerequisite
+		 * for successful initialization of DCB is that LLDP is
+		 * enabled. So it is needed to start lldp before DCB init
+		 * and stop it after initialization.
+		 */
+		ret = i40e_aq_start_lldp(hw, true, NULL);
+		if (ret != I40E_SUCCESS)
+			PMD_INIT_LOG(DEBUG, "Failed to start lldp");
 
 		ret = i40e_init_dcb(hw, true);
 		/* If lldp agent is stopped, the return value from
@@ -11718,6 +11722,12 @@ i40e_dcb_init_configure(struct rte_eth_dev *dev, bool sw_dcb)
 				ret, hw->aq.asq_last_status);
 			return -ENOTSUP;
 		}
+
+		if (i40e_need_stop_lldp(dev)) {
+			ret = i40e_aq_stop_lldp(hw, true, true, NULL);
+			if (ret != I40E_SUCCESS)
+				PMD_INIT_LOG(DEBUG, "Failed to stop lldp");
+		}
 	} else {
 		ret = i40e_aq_start_lldp(hw, true, NULL);
 		if (ret != I40E_SUCCESS)
-- 
2.17.1