ice: add E830 HW VF mailbox message limit support

jira LE-3504
Rebuild_History Non-Buildable kernel-6.12.0-55.19.1.el10_0
commit-author Paul Greenwalt <paul.greenwalt@intel.com>
commit 59f4d59

E830 adds hardware support to prevent the VF from overflowing the PF
mailbox with VIRTCHNL messages. E830 will use the hardware feature
(ICE_F_MBX_LIMIT) instead of the software solution ice_is_malicious_vf().

To prevent a VF from overflowing the PF, the PF sets the number of
messages per VF that can be in the PF's mailbox queue
(ICE_MBX_OVERFLOW_WATERMARK). When the PF processes a message from a VF,
the PF decrements the per VF message count using the E830_MBX_VF_DEC_TRIG
register.

	Signed-off-by: Paul Greenwalt <paul.greenwalt@intel.com>
	Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
	Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
	Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
(cherry picked from commit 59f4d59)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/net/ethernet/intel/ice/ice.h

@@ -207,6 +207,7 @@ enum ice_feature {
 	ICE_F_GNSS,
 	ICE_F_ROCE_LAG,
 	ICE_F_SRIOV_LAG,
+	ICE_F_MBX_LIMIT,
 	ICE_F_MAX
 };
 

drivers/net/ethernet/intel/ice/ice_hw_autogen.h

@@ -539,5 +539,8 @@
 #define E830_PRTMAC_CL01_QNT_THR_CL0_M		GENMASK(15, 0)
 #define VFINT_DYN_CTLN(_i)			(0x00003800 + ((_i) * 4))
 #define VFINT_DYN_CTLN_CLEARPBA_M		BIT(1)
+#define E830_MBX_PF_IN_FLIGHT_VF_MSGS_THRESH	0x00234000
+#define E830_MBX_VF_DEC_TRIG(_VF)		(0x00233800 + (_VF) * 4)
+#define E830_MBX_VF_IN_FLIGHT_MSGS_AT_PF_CNT(_VF)	(0x00233000 + (_VF) * 4)
 
 #endif /* _ICE_HW_AUTOGEN_H_ */

drivers/net/ethernet/intel/ice/ice_lib.c

@@ -3880,6 +3880,9 @@ void ice_init_feature_support(struct ice_pf *pf)
 	default:
 		break;
 	}
+
+	if (pf->hw.mac_type == ICE_MAC_E830)
+		ice_set_feature_support(pf, ICE_F_MBX_LIMIT);
 }
 
 /**

drivers/net/ethernet/intel/ice/ice_main.c

@@ -1546,12 +1546,20 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)
 			ice_vf_lan_overflow_event(pf, &event);
 			break;
 		case ice_mbx_opc_send_msg_to_pf:
-			data.num_msg_proc = i;
-			data.num_pending_arq = pending;
-			data.max_num_msgs_mbx = hw->mailboxq.num_rq_entries;
-			data.async_watermark_val = ICE_MBX_OVERFLOW_WATERMARK;
+			if (ice_is_feature_supported(pf, ICE_F_MBX_LIMIT)) {
+				ice_vc_process_vf_msg(pf, &event, NULL);
+				ice_mbx_vf_dec_trig_e830(hw, &event);
+			} else {
+				u16 val = hw->mailboxq.num_rq_entries;
+
+				data.max_num_msgs_mbx = val;
+				val = ICE_MBX_OVERFLOW_WATERMARK;
+				data.async_watermark_val = val;
+				data.num_msg_proc = i;
+				data.num_pending_arq = pending;
 
-			ice_vc_process_vf_msg(pf, &event, &data);
+				ice_vc_process_vf_msg(pf, &event, &data);
+			}
 			break;
 		case ice_aqc_opc_fw_logs_event:
 			ice_get_fwlog_data(pf, &event);
@@ -4082,7 +4090,11 @@ static int ice_init_pf(struct ice_pf *pf)
 
 	mutex_init(&pf->vfs.table_lock);
 	hash_init(pf->vfs.table);
-	ice_mbx_init_snapshot(&pf->hw);
+	if (ice_is_feature_supported(pf, ICE_F_MBX_LIMIT))
+		wr32(&pf->hw, E830_MBX_PF_IN_FLIGHT_VF_MSGS_THRESH,
+		     ICE_MBX_OVERFLOW_WATERMARK);
+	else
+		ice_mbx_init_snapshot(&pf->hw);
 
 	xa_init(&pf->dyn_ports);
 	xa_init(&pf->sf_nums);

drivers/net/ethernet/intel/ice/ice_sriov.c

@@ -194,7 +194,8 @@ void ice_free_vfs(struct ice_pf *pf)
 		}
 
 		/* clear malicious info since the VF is getting released */
-		list_del(&vf->mbx_info.list_entry);
+		if (!ice_is_feature_supported(pf, ICE_F_MBX_LIMIT))
+			list_del(&vf->mbx_info.list_entry);
 
 		mutex_unlock(&vf->cfg_lock);
 	}

drivers/net/ethernet/intel/ice/ice_vf_lib.c

@@ -716,6 +716,23 @@ ice_vf_clear_vsi_promisc(struct ice_vf *vf, struct ice_vsi *vsi, u8 promisc_m)
 	return 0;
 }
 
+/**
+ * ice_reset_vf_mbx_cnt - reset VF mailbox message count
+ * @vf: pointer to the VF structure
+ *
+ * This function clears the VF mailbox message count, and should be called on
+ * VF reset.
+ */
+static void ice_reset_vf_mbx_cnt(struct ice_vf *vf)
+{
+	struct ice_pf *pf = vf->pf;
+
+	if (ice_is_feature_supported(pf, ICE_F_MBX_LIMIT))
+		ice_mbx_vf_clear_cnt_e830(&pf->hw, vf->vf_id);
+	else
+		ice_mbx_clear_malvf(&vf->mbx_info);
+}
+
 /**
  * ice_reset_all_vfs - reset all allocated VFs in one go
  * @pf: pointer to the PF structure
@@ -742,7 +759,7 @@ void ice_reset_all_vfs(struct ice_pf *pf)
 
 	/* clear all malicious info if the VFs are getting reset */
 	ice_for_each_vf(pf, bkt, vf)
-		ice_mbx_clear_malvf(&vf->mbx_info);
+		ice_reset_vf_mbx_cnt(vf);
 
 	/* If VFs have been disabled, there is no need to reset */
 	if (test_and_set_bit(ICE_VF_DIS, pf->state)) {
@@ -958,7 +975,7 @@ int ice_reset_vf(struct ice_vf *vf, u32 flags)
 	ice_eswitch_update_repr(&vf->repr_id, vsi);
 
 	/* if the VF has been reset allow it to come up again */
-	ice_mbx_clear_malvf(&vf->mbx_info);
+	ice_reset_vf_mbx_cnt(vf);
 
 out_unlock:
 	if (lag && lag->bonded && lag->primary &&
@@ -1011,7 +1028,10 @@ void ice_initialize_vf_entry(struct ice_vf *vf)
 	ice_vf_fdir_init(vf);
 
 	/* Initialize mailbox info for this VF */
-	ice_mbx_init_vf_info(&pf->hw, &vf->mbx_info);
+	if (ice_is_feature_supported(pf, ICE_F_MBX_LIMIT))
+		ice_mbx_vf_clear_cnt_e830(&pf->hw, vf->vf_id);
+	else
+		ice_mbx_init_vf_info(&pf->hw, &vf->mbx_info);
 
 	mutex_init(&vf->cfg_lock);
 }

drivers/net/ethernet/intel/ice/ice_vf_mbx.c

@@ -210,6 +210,38 @@ ice_mbx_detect_malvf(struct ice_hw *hw, struct ice_mbx_vf_info *vf_info,
 	return 0;
 }
 
+/**
+ * ice_mbx_vf_dec_trig_e830 - Decrements the VF mailbox queue counter
+ * @hw: pointer to the HW struct
+ * @event: pointer to the control queue receive event
+ *
+ * This function triggers to decrement the counter
+ * MBX_VF_IN_FLIGHT_MSGS_AT_PF_CNT when the driver replenishes
+ * the buffers at the PF mailbox queue.
+ */
+void ice_mbx_vf_dec_trig_e830(const struct ice_hw *hw,
+			      const struct ice_rq_event_info *event)
+{
+	u16 vfid = le16_to_cpu(event->desc.retval);
+
+	wr32(hw, E830_MBX_VF_DEC_TRIG(vfid), 1);
+}
+
+/**
+ * ice_mbx_vf_clear_cnt_e830 - Clear the VF mailbox queue count
+ * @hw: pointer to the HW struct
+ * @vf_id: VF ID in the PF space
+ *
+ * This function clears the counter MBX_VF_IN_FLIGHT_MSGS_AT_PF_CNT, and should
+ * be called when a VF is created and on VF reset.
+ */
+void ice_mbx_vf_clear_cnt_e830(const struct ice_hw *hw, u16 vf_id)
+{
+	u32 reg = rd32(hw, E830_MBX_VF_IN_FLIGHT_MSGS_AT_PF_CNT(vf_id));
+
+	wr32(hw, E830_MBX_VF_DEC_TRIG(vf_id), reg);
+}
+
 /**
  * ice_mbx_vf_state_handler - Handle states of the overflow algorithm
  * @hw: pointer to the HW struct

drivers/net/ethernet/intel/ice/ice_vf_mbx.h

@@ -19,6 +19,9 @@ ice_aq_send_msg_to_vf(struct ice_hw *hw, u16 vfid, u32 v_opcode, u32 v_retval,
 		      u8 *msg, u16 msglen, struct ice_sq_cd *cd);
 
 u32 ice_conv_link_speed_to_virtchnl(bool adv_link_support, u16 link_speed);
+void ice_mbx_vf_dec_trig_e830(const struct ice_hw *hw,
+			      const struct ice_rq_event_info *event);
+void ice_mbx_vf_clear_cnt_e830(const struct ice_hw *hw, u16 vf_id);
 int
 ice_mbx_vf_state_handler(struct ice_hw *hw, struct ice_mbx_data *mbx_data,
 			 struct ice_mbx_vf_info *vf_info, bool *report_malvf);
@@ -47,5 +50,11 @@ static inline void ice_mbx_init_snapshot(struct ice_hw *hw)
 {
 }
 
+static inline void
+ice_mbx_vf_dec_trig_e830(const struct ice_hw *hw,
+			 const struct ice_rq_event_info *event)
+{
+}
+
 #endif /* CONFIG_PCI_IOV */
 #endif /* _ICE_VF_MBX_H_ */

drivers/net/ethernet/intel/ice/ice_virtchnl.c

@@ -4009,8 +4009,10 @@ ice_is_malicious_vf(struct ice_vf *vf, struct ice_mbx_data *mbxdata)
  * @event: pointer to the AQ event
  * @mbxdata: information used to detect VF attempting mailbox overflow
  *
- * called from the common asq/arq handler to
- * process request from VF
+ * Called from the common asq/arq handler to process request from VF. When this
+ * flow is used for devices with hardware VF to PF message queue overflow
+ * support (ICE_F_MBX_LIMIT) mbxdata is set to NULL and ice_is_malicious_vf
+ * check is skipped.
  */
 void ice_vc_process_vf_msg(struct ice_pf *pf, struct ice_rq_event_info *event,
 			   struct ice_mbx_data *mbxdata)
@@ -4036,7 +4038,7 @@ void ice_vc_process_vf_msg(struct ice_pf *pf, struct ice_rq_event_info *event,
 	mutex_lock(&vf->cfg_lock);
 
 	/* Check if the VF is trying to overflow the mailbox */
-	if (ice_is_malicious_vf(vf, mbxdata))
+	if (mbxdata && ice_is_malicious_vf(vf, mbxdata))
 		goto finish;
 
 	/* Check if VF is disabled. */