[dpdk-dev] [PATCH] net/bnxt: fix link update op

[Kalesh A P <kalesh-anakkur.purayil@broadcom.com>]

From: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>

1. When port is stopped, we can forcibly set the link status for the
   device to down.
2. VFs and MH PFs do not have the privilege to bring the link down.
   As a result driver prints "Link Up" when port is stopped.
3. When driver receives link status/speed/config async event from fw,
   driver invokes bnxt_link_update() with exp_link_status as ETH_LINK_UP.
   This is not logically correct as the async event could be for Link up
   or link down or for speed change.

Fixes: 074cacb9907a ("net/bnxt: fix link during port toggle")
Cc: stable@dpdk.org

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt.h        |  4 ++--
 drivers/net/bnxt/bnxt_cpr.c    |  2 +-
 drivers/net/bnxt/bnxt_ethdev.c | 40 ++++++++++++++++++++--------------------
 3 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index 19d4774..fafd61c 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -268,8 +268,8 @@ struct bnxt_pf_info {
 };
 
 /* Max wait time for link up is 10s and link down is 500ms */
-#define BNXT_LINK_UP_WAIT_CNT	200
-#define BNXT_LINK_DOWN_WAIT_CNT	10
+#define BNXT_MAX_LINK_WAIT_CNT	200
+#define BNXT_MIN_LINK_WAIT_CNT	10
 #define BNXT_LINK_WAIT_INTERVAL	50
 struct bnxt_link_info {
 	uint32_t		phy_flags;
diff --git a/drivers/net/bnxt/bnxt_cpr.c b/drivers/net/bnxt/bnxt_cpr.c
index 8311e26..a3a7e6a 100644
--- a/drivers/net/bnxt/bnxt_cpr.c
+++ b/drivers/net/bnxt/bnxt_cpr.c
@@ -111,7 +111,7 @@ void bnxt_handle_async_event(struct bnxt *bp,
 	case HWRM_ASYNC_EVENT_CMPL_EVENT_ID_LINK_SPEED_CHANGE:
 	case HWRM_ASYNC_EVENT_CMPL_EVENT_ID_LINK_SPEED_CFG_CHANGE:
 		/* FALLTHROUGH */
-		bnxt_link_update(bp->eth_dev, 0, ETH_LINK_UP);
+		bnxt_link_update_op(bp->eth_dev, 0);
 		break;
 	case HWRM_ASYNC_EVENT_CMPL_EVENT_ID_PF_DRVR_UNLOAD:
 		PMD_DRV_LOG(INFO, "Async event: PF driver unloaded\n");
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index b99c712..268b8fe 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -1279,7 +1279,7 @@ static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev)
 	eth_dev->data->scattered_rx = bnxt_scattered_rx(eth_dev);
 	eth_dev->data->dev_started = 1;
 
-	bnxt_link_update(eth_dev, 1, ETH_LINK_UP);
+	bnxt_link_update_op(eth_dev, 1);
 
 	if (rx_offloads & DEV_RX_OFFLOAD_VLAN_FILTER)
 		vlan_mask |= ETH_VLAN_FILTER_MASK;
@@ -1347,6 +1347,7 @@ static void bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
 	struct bnxt *bp = eth_dev->data->dev_private;
 	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(eth_dev);
 	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
+	struct rte_eth_link link;
 
 	eth_dev->data->dev_started = 0;
 	eth_dev->data->scattered_rx = 0;
@@ -1369,15 +1370,15 @@ static void bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
 	bnxt_cancel_fw_health_check(bp);
 
 	/* Do not bring link down during reset recovery */
-	if (!is_bnxt_in_error(bp))
+	if (!is_bnxt_in_error(bp)) {
 		bnxt_dev_set_link_down_op(eth_dev);
-
-	/* Wait for link to be reset and the async notification to process.
-	 * During reset recovery, there is no need to wait and
-	 * VF/NPAR functions do not have privilege to change PHY config.
-	 */
-	if (!is_bnxt_in_error(bp) && BNXT_SINGLE_PF(bp))
-		bnxt_link_update(eth_dev, 1, ETH_LINK_DOWN);
+		/* Wait for link to be reset */
+		if (BNXT_SINGLE_PF(bp))
+			rte_delay_ms(500);
+		/* clear the recorded link status */
+		memset(&link, 0, sizeof(link));
+		rte_eth_linkstatus_set(eth_dev, &link);
+	}
 
 	/* Clean queue intr-vector mapping */
 	rte_intr_efd_disable(intr_handle);
@@ -1552,14 +1553,13 @@ static int bnxt_mac_addr_add_op(struct rte_eth_dev *eth_dev,
 	return rc;
 }
 
-int bnxt_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete,
-		     bool exp_link_status)
+int bnxt_link_update_op(struct rte_eth_dev *eth_dev, int wait_to_complete)
 {
 	int rc = 0;
 	struct bnxt *bp = eth_dev->data->dev_private;
 	struct rte_eth_link new;
-	int cnt = exp_link_status ? BNXT_LINK_UP_WAIT_CNT :
-		  BNXT_LINK_DOWN_WAIT_CNT;
+	int cnt = wait_to_complete ? BNXT_MAX_LINK_WAIT_CNT :
+			BNXT_MIN_LINK_WAIT_CNT;
 
 	rc = is_bnxt_in_error(bp);
 	if (rc)
@@ -1577,12 +1577,18 @@ int bnxt_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete,
 			goto out;
 		}
 
-		if (!wait_to_complete || new.link_status == exp_link_status)
+		if (!wait_to_complete || new.link_status)
 			break;
 
 		rte_delay_ms(BNXT_LINK_WAIT_INTERVAL);
 	} while (cnt--);
 
+	/* Only single function PF can bring phy down.
+	 * When port is stopped, report link down for VF/MH/NPAR functions.
+	 */
+	if (!BNXT_SINGLE_PF(bp) && !eth_dev->data->dev_started)
+		memset(&new, 0, sizeof(new));
+
 out:
 	/* Timed out or success */
 	if (new.link_status != eth_dev->data->dev_link.link_status ||
@@ -1599,12 +1605,6 @@ int bnxt_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete,
 	return rc;
 }
 
-int bnxt_link_update_op(struct rte_eth_dev *eth_dev,
-			int wait_to_complete)
-{
-	return bnxt_link_update(eth_dev, wait_to_complete, ETH_LINK_UP);
-}
-
 static int bnxt_promiscuous_enable_op(struct rte_eth_dev *eth_dev)
 {
 	struct bnxt *bp = eth_dev->data->dev_private;
-- 
2.10.1