rmnet_core: LLC auto switch

Support auto switch of bearers to low latency channel.

Change-Id: I3bc029b9736b1c9f645db9f02a1d09ffe8bf1c2b
Signed-off-by: Weiyi Chen <quic_weiyic@quicinc.com>

core/dfc_defs.h

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef _DFC_DEFS_H
@@ -55,6 +56,7 @@ struct dfc_flow_status_info_type_v01 {
 	struct dfc_qos_id_type_v01 qos_ids[DFC_MAX_QOS_ID_V01];
 	u8 rx_bytes_valid;
 	u32 rx_bytes;
+	u8 ll_status;
 };
 
 struct dfc_ancillary_info_type_v01 {

core/dfc_qmap.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <net/pkt_sched.h>
@@ -38,7 +39,8 @@ struct qmap_dfc_ind {
 	u8			bearer_id;
 	u8			tcp_bidir:1;
 	u8			bearer_status:3;
-	u8			reserved4:4;
+	u8			ll_status:1;
+	u8			reserved4:3;
 	__be32			grant;
 	__be32			rx_bytes;
 	u32			reserved6;
@@ -146,6 +148,7 @@ static int dfc_qmap_handle_ind(struct dfc_qmi_data *dfc,
 	qmap_flow_ind.flow_status[0].bearer_id = cmd->bearer_id;
 	qmap_flow_ind.flow_status[0].num_bytes = ntohl(cmd->grant);
 	qmap_flow_ind.flow_status[0].seq_num = ntohs(cmd->seq_num);
+	qmap_flow_ind.flow_status[0].ll_status = cmd->ll_status;
 
 	if (cmd->rx_bytes_valid) {
 		qmap_flow_ind.flow_status[0].rx_bytes_valid = 1;

core/dfc_qmi.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -1026,6 +1027,14 @@ static int dfc_update_fc_map(struct net_device *dev, struct qos_info *qos,
 		if (itm->tx_off  && fc_info->num_bytes > 0)
 			return 0;
 
+		if (fc_info->ll_status &&
+		    itm->ch_switch.current_ch != RMNET_CH_LL) {
+			itm->ch_switch.current_ch = RMNET_CH_LL;
+			itm->ch_switch.auto_switched = true;
+			if (itm->mq_idx < MAX_MQ_NUM)
+				qos->mq[itm->mq_idx].is_ll_ch = RMNET_CH_LL;
+		}
+
 		/* Adjuste grant for query */
 		if (dfc_qmap && is_query) {
 			adjusted_grant = dfc_adjust_grant(itm, fc_info);

core/qmi_rmnet_i.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -62,6 +62,7 @@ struct rmnet_ch_switch {
 	u8 switch_to_ch;
 	u8 retry_left;
 	u8 status_code;
+	bool auto_switched;
 	enum rmnet_ch_switch_state state;
 	__be32 switch_txid;
 	u32 flags;