[PATCH iwl-next v4 01/10] ice: Correctly initialize queue context values

[Dave Ertman <david.m.ertman@intel.com>]

From: Jacob Keller <jacob.e.keller@intel.com>

The ice_alloc_lan_q_ctx function allocates the queue context array for a
given traffic class. This function uses devm_kcalloc which will
zero-allocate the structure. Thus, prior to any queue being setup by
ice_ena_vsi_txq, the q_ctx structure will have a q_handle of 0 and a q_teid
of 0. These are potentially valid values.

Modify the ice_alloc_lan_q_ctx function to initialize every member of the
q_ctx array to have invalid values. Modify ice_dis_vsi_txq to ensure that
it assigns q_teid to an invalid value when it assigns q_handle to the
invalid value as well.

This will allow other code to check whether the queue context is currently
valid before operating on it.

Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_common.c |  1 +
 drivers/net/ethernet/intel/ice/ice_sched.c  | 23 ++++++++++++++++-----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index deb55b6d516a..09e2e38d538e 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -4673,6 +4673,7 @@ ice_dis_vsi_txq(struct ice_port_info *pi, u16 vsi_handle, u8 tc, u8 num_queues,
 			break;
 		ice_free_sched_node(pi, node);
 		q_ctx->q_handle = ICE_INVAL_Q_HANDLE;
+		q_ctx->q_teid = ICE_INVAL_TEID;
 	}
 	mutex_unlock(&pi->sched_lock);
 	kfree(qg_list);
diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c b/drivers/net/ethernet/intel/ice/ice_sched.c
index b664d60fd037..79a8972873f1 100644
--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -569,18 +569,24 @@ ice_alloc_lan_q_ctx(struct ice_hw *hw, u16 vsi_handle, u8 tc, u16 new_numqs)
 {
 	struct ice_vsi_ctx *vsi_ctx;
 	struct ice_q_ctx *q_ctx;
+	u16 idx;
 
 	vsi_ctx = ice_get_vsi_ctx(hw, vsi_handle);
 	if (!vsi_ctx)
 		return -EINVAL;
 	/* allocate LAN queue contexts */
 	if (!vsi_ctx->lan_q_ctx[tc]) {
-		vsi_ctx->lan_q_ctx[tc] = devm_kcalloc(ice_hw_to_dev(hw),
-						      new_numqs,
-						      sizeof(*q_ctx),
-						      GFP_KERNEL);
-		if (!vsi_ctx->lan_q_ctx[tc])
+		q_ctx = devm_kcalloc(ice_hw_to_dev(hw), new_numqs,
+				     sizeof(*q_ctx), GFP_KERNEL);
+		if (!q_ctx)
 			return -ENOMEM;
+
+		for (idx = 0; idx < new_numqs; idx++) {
+			q_ctx[idx].q_handle = ICE_INVAL_Q_HANDLE;
+			q_ctx[idx].q_teid = ICE_INVAL_TEID;
+		}
+
+		vsi_ctx->lan_q_ctx[tc] = q_ctx;
 		vsi_ctx->num_lan_q_entries[tc] = new_numqs;
 		return 0;
 	}
@@ -592,9 +598,16 @@ ice_alloc_lan_q_ctx(struct ice_hw *hw, u16 vsi_handle, u8 tc, u16 new_numqs)
 				     sizeof(*q_ctx), GFP_KERNEL);
 		if (!q_ctx)
 			return -ENOMEM;
+
 		memcpy(q_ctx, vsi_ctx->lan_q_ctx[tc],
 		       prev_num * sizeof(*q_ctx));
 		devm_kfree(ice_hw_to_dev(hw), vsi_ctx->lan_q_ctx[tc]);
+
+		for (idx = prev_num; idx < new_numqs; idx++) {
+			q_ctx[idx].q_handle = ICE_INVAL_Q_HANDLE;
+			q_ctx[idx].q_teid = ICE_INVAL_TEID;
+		}
+
 		vsi_ctx->lan_q_ctx[tc] = q_ctx;
 		vsi_ctx->num_lan_q_entries[tc] = new_numqs;
 	}
-- 
2.40.1