netdev - [PATCH iwl-net v3] ice: Block switchdev mode when ADQ is active and vice versa

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Message-ID: <20230810121245.51587-2-marcin.szycik@linux.intel.com>
Date: Thu, 10 Aug 2023 14:12:46 +0200
From: Marcin Szycik <marcin.szycik@...ux.intel.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	leon@...nel.org,
	jiri@...nulli.us,
	anthony.l.nguyen@...el.com,
	Marcin Szycik <marcin.szycik@...ux.intel.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: [PATCH iwl-net v3] ice: Block switchdev mode when ADQ is active and vice versa

ADQ and switchdev are not supported simultaneously. Enabling both at the
same time can result in nullptr dereference.

To prevent this, check if ADQ is active when changing devlink mode to
switchdev mode, and check if switchdev is active when enabling ADQ.

Fixes: fbc7b27af0f9 ("ice: enable ndo_setup_tc support for mqprio_qdisc")
Signed-off-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
---
v2: Added netlink extack, changed error message to be more informative,
    fixed typo in commit message
v3: Moved switchdev mode check out of adev lock
---
 drivers/net/ethernet/intel/ice/ice_eswitch.c | 6 ++++++
 drivers/net/ethernet/intel/ice/ice_main.c    | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_eswitch.c b/drivers/net/ethernet/intel/ice/ice_eswitch.c
index ad0a007b7398..8f232c41a89e 100644
--- a/drivers/net/ethernet/intel/ice/ice_eswitch.c
+++ b/drivers/net/ethernet/intel/ice/ice_eswitch.c
@@ -538,6 +538,12 @@ ice_eswitch_mode_set(struct devlink *devlink, u16 mode,
 		break;
 	case DEVLINK_ESWITCH_MODE_SWITCHDEV:
 	{
+		if (ice_is_adq_active(pf)) {
+			dev_err(ice_pf_to_dev(pf), "Couldn't change eswitch mode to switchdev - ADQ is active. Delete ADQ configs and try again, e.g. tc qdisc del dev $PF root");
+			NL_SET_ERR_MSG_MOD(extack, "Couldn't change eswitch mode to switchdev - ADQ is active. Delete ADQ configs and try again, e.g. tc qdisc del dev $PF root");
+			return -EOPNOTSUPP;
+		}
+
 		dev_info(ice_pf_to_dev(pf), "PF %d changed eswitch mode to switchdev",
 			 pf->hw.pf_id);
 		NL_SET_ERR_MSG_MOD(extack, "Changed eswitch mode to switchdev");
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index cf92c39467c8..b40dfe6ae321 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -8823,6 +8823,11 @@ ice_setup_tc(struct net_device *netdev, enum tc_setup_type type,
 						  ice_setup_tc_block_cb,
 						  np, np, true);
 	case TC_SETUP_QDISC_MQPRIO:
+		if (ice_is_eswitch_mode_switchdev(pf)) {
+			netdev_err(netdev, "TC MQPRIO offload not supported, switchdev is enabled\n");
+			return -EOPNOTSUPP;
+		}
+
 		if (pf->adev) {
 			mutex_lock(&pf->adev_mutex);
 			device_lock(&pf->adev->dev);
-- 
2.41.0