[dpdk-dev] [PATCH 2/4] bnxt: Fix a segfault encountered during KNI exit

[Ajit Khaparde]

The bnxt PMD is running into a segfault when exiting out of KNI
in the dev_uninit/close path. This patch fixes that.

Signed-off-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
---
 drivers/net/bnxt/bnxt.h        |  1 +
 drivers/net/bnxt/bnxt_ethdev.c | 34 ++++++++++++++++++++++------------
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index c77ecef..07b4cf2 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -175,6 +175,7 @@ struct bnxt {
        struct bnxt_pf_info             pf;
        struct bnxt_vf_info             vf;
        uint8_t                 port_partition_type;
+       uint8_t                 dev_stopped;
 };

 #endif
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index bd1ffc0..1e3519b 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -428,6 +428,7 @@ static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev)
        struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
        int rc;

+       bp->dev_stopped = 0;
        rc = bnxt_hwrm_func_reset(bp);
        if (rc) {
                RTE_LOG(ERR, PMD, "hwrm chip reset failure rc: %x\n", rc);
@@ -471,10 +472,27 @@ static int bnxt_dev_set_link_down_op(struct rte_eth_dev 
*eth_dev)
        return 0;
 }

+/* Unload the driver, release resources */
+static void bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
+{
+       struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
+
+       if (bp->eth_dev->data->dev_started) {
+               /* TBD: STOP HW queues DMA */
+               eth_dev->data->dev_link.link_status = 0;
+       }
+       bnxt_set_hwrm_link_config(bp, false);
+       bnxt_shutdown_nic(bp);
+       bp->dev_stopped = 1;
+}
+
 static void bnxt_dev_close_op(struct rte_eth_dev *eth_dev)
 {
        struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;

+       if (bp->dev_stopped == 0)
+               bnxt_dev_stop_op(eth_dev);
+
        bnxt_free_tx_mbufs(bp);
        bnxt_free_rx_mbufs(bp);
        bnxt_free_mem(bp);
@@ -488,18 +506,6 @@ static void bnxt_dev_close_op(struct rte_eth_dev *eth_dev)
        }
 }

-/* Unload the driver, release resources */
-static void bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
-{
-       struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
-
-       if (bp->eth_dev->data->dev_started) {
-               /* TBD: STOP HW queues DMA */
-               eth_dev->data->dev_link.link_status = 0;
-       }
-       bnxt_shutdown_nic(bp);
-}
-
 static void bnxt_mac_addr_remove_op(struct rte_eth_dev *eth_dev,
                                    uint32_t index)
 {
@@ -1078,6 +1084,8 @@ bnxt_dev_init(struct rte_eth_dev *eth_dev)
                eth_dev->pci_dev->mem_resource[0].phys_addr,
                eth_dev->pci_dev->mem_resource[0].addr);

+       bp->dev_stopped = 0;
+
        return 0;

 error_free:
@@ -1101,6 +1109,8 @@ bnxt_dev_uninit(struct rte_eth_dev *eth_dev) {
        }
        rc = bnxt_hwrm_func_driver_unregister(bp, 0);
        bnxt_free_hwrm_resources(bp);
+       if (bp->dev_stopped == 0)
+               bnxt_dev_close_op(eth_dev);
        eth_dev->dev_ops = NULL;
        eth_dev->rx_pkt_burst = NULL;
        eth_dev->tx_pkt_burst = NULL;
-- 
2.4.3