[PATCH 5.11 042/210] ice: prevent ice_open and ice_stop during reset

Greg Kroah-Hartman
2021-04-12T09:31:10Z

From: Krzysztof Goreczny <krzysztof.goreczny@intel.com>

commit e95fc8573e07c5e4825df4650fd8b8c93fad27a7 upstream.

There is a possibility of race between ice_open or ice_stop calls
performed by OS and reset handling routine both trying to modify VSI
resources. Observed scenarios:
- reset handler deallocates memory in ice_vsi_free_arrays and ice_open
tries to access it in ice_vsi_cfg_txq leading to driver crash
- reset handler deallocates memory in ice_vsi_free_arrays and ice_close
tries to access it in ice_down leading to driver crash
- reset handler clears port scheduler topology and sets port state to
ICE_SCHED_PORT_STATE_INIT leading to ice_ena_vsi_txq fail in ice_open

To prevent this additional checks in ice_open and ice_stop are
introduced to make sure that OS is not allowed to alter VSI config while
reset is in progress.

Fixes: cdedef59deb0 ("ice: Configure VSIs for Tx/Rx")
Signed-off-by: Krzysztof Goreczny <krzysztof.goreczny@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/intel/ice/ice.h | 1 +
drivers/net/ethernet/intel/ice/ice_lib.c | 4 ++--
drivers/net/ethernet/intel/ice/ice_main.c | 28 ++++++++++++++++++++++++++++
3 files changed, 31 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -604,6 +604,7 @@ int ice_fdir_create_dflt_rules(struct ic
int ice_aq_wait_for_event(struct ice_pf *pf, u16 opcode, unsigned long timeout,
struct ice_rq_event_info *event);
int ice_open(struct net_device *netdev);
+int ice_open_internal(struct net_device *netdev);
int ice_stop(struct net_device *netdev);
void ice_service_task_schedule(struct ice_pf *pf);

--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -2489,7 +2489,7 @@ int ice_ena_vsi(struct ice_vsi *vsi, boo
if (!locked)
rtnl_lock();

- err = ice_open(vsi->netdev);
+ err = ice_open_internal(vsi->netdev);

if (!locked)
rtnl_unlock();
@@ -2518,7 +2518,7 @@ void ice_dis_vsi(struct ice_vsi *vsi, bo
if (!locked)
rtnl_lock();

- ice_stop(vsi->netdev);
+ ice_vsi_close(vsi);

if (!locked)
rtnl_unlock();
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6612,6 +6612,28 @@ static void ice_tx_timeout(struct net_de
int ice_open(struct net_device *netdev)
{
struct ice_netdev_priv *np = netdev_priv(netdev);
+ struct ice_pf *pf = np->vsi->back;
+
+ if (ice_is_reset_in_progress(pf->state)) {
+ netdev_err(netdev, "can't open net device while reset is in progress");
+ return -EBUSY;
+ }
+
+ return ice_open_internal(netdev);
+}
+
+/**
+ * ice_open_internal - Called when a network interface becomes active
+ * @netdev: network interface device structure
+ *
+ * Internal ice_open implementation. Should not be used directly except for ice_open and reset
+ * handling routine
+ *
+ * Returns 0 on success, negative value on failure
+ */
+int ice_open_internal(struct net_device *netdev)
+{
+ struct ice_netdev_priv *np = netdev_priv(netdev);
struct ice_vsi *vsi = np->vsi;
struct ice_pf *pf = vsi->back;
struct ice_port_info *pi;
@@ -6690,6 +6712,12 @@ int ice_stop(struct net_device *netdev)
{
struct ice_netdev_priv *np = netdev_priv(netdev);
struct ice_vsi *vsi = np->vsi;
+ struct ice_pf *pf = vsi->back;
+
+ if (ice_is_reset_in_progress(pf->state)) {
+ netdev_err(netdev, "can't stop net device while reset is in progress");
+ return -EBUSY;
+ }

ice_vsi_close(vsi);