[PATCH 1/4] net/mlx5: fix secondary process port close

[Michael Baum]

The "mlx5_dev_close()" function is used for both primary and secondary
processes.

If secondary process use this function after primary process is closed,
the priv structure isn't valid anymore.
The function is accessing priv structure to get "sh" pointer in part
shared between processes causing a crash for secondary.

This patch avoids this access and print warning in this case.

Fixes: f5177bdc8b76 ("net/mlx5: add GENEVE TLV options parser API")
Cc: michaelba at nvidia.com
Cc: stable at dpdk.org

Signed-off-by: Michael Baum <michaelba at nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
---
 drivers/net/mlx5/mlx5.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index d1a63822a5..585b4d5497 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -2295,11 +2295,13 @@ int
 mlx5_dev_close(struct rte_eth_dev *dev)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
-	struct mlx5_dev_ctx_shared *sh = priv->sh;
+	struct mlx5_dev_ctx_shared *sh;
 	unsigned int i;
 	int ret;
 
 	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+		if (!priv)
+			DRV_LOG(WARNING, "primary process is already closed");
 		/* Check if process_private released. */
 		if (!dev->process_private)
 			return 0;
@@ -2308,6 +2310,7 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 		rte_eth_dev_release_port(dev);
 		return 0;
 	}
+	sh = priv->sh;
 	if (!sh)
 		return 0;
 	if (priv->shared_refcnt) {
@@ -2326,9 +2329,7 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 	}
 #endif
 	DRV_LOG(DEBUG, "port %u closing device \"%s\"",
-		dev->data->port_id,
-		((priv->sh->cdev->ctx != NULL) ?
-		mlx5_os_get_ctx_device_name(priv->sh->cdev->ctx) : ""));
+		dev->data->port_id, sh->ibdev_name);
 	/*
 	 * If default mreg copy action is removed at the stop stage,
 	 * the search will return none and nothing will be done anymore.
@@ -2402,7 +2403,7 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 		mlx5_free(priv->rss_conf.rss_key);
 	if (priv->reta_idx != NULL)
 		mlx5_free(priv->reta_idx);
-	if (priv->sh->dev_cap.vf)
+	if (sh->dev_cap.vf)
 		mlx5_os_mac_addr_flush(dev);
 	if (priv->nl_socket_route >= 0)
 		close(priv->nl_socket_route);
@@ -2445,7 +2446,7 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 	if (priv->hrxqs)
 		mlx5_list_destroy(priv->hrxqs);
 	mlx5_free(priv->ext_rxqs);
-	priv->sh->port[priv->dev_port - 1].nl_ih_port_id = RTE_MAX_ETHPORTS;
+	sh->port[priv->dev_port - 1].nl_ih_port_id = RTE_MAX_ETHPORTS;
 	/*
 	 * The interrupt handler port id must be reset before priv is reset
 	 * since 'mlx5_dev_interrupt_nl_cb' uses priv.
@@ -2457,7 +2458,7 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 	 * mlx5_os_mac_addr_flush() uses ibdev_path for retrieving
 	 * ifindex if Netlink fails.
 	 */
-	mlx5_free_shared_dev_ctx(priv->sh);
+	mlx5_free_shared_dev_ctx(sh);
 	if (priv->domain_id != RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID) {
 		unsigned int c = 0;
 		uint16_t port_id;
-- 
2.25.1