ice: add E830 HW VF mailbox message limit support

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 <[email protected]>
Reviewed-by: Alexander Lobakin <[email protected]>
Tested-by: Rafal Romanowski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index eeb48cc48e08..9f6e8a5508a2 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -1563,12 +1563,20 @@ 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);
@@ -4099,7 +4107,11 @@ 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);