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

[Ye Xiaolong <xiaolong.ye@intel.com>]

On 03/05, Shougang Wang wrote:
>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
>

Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>

Applied to dpdk-next-net-intel, Thanks.