From 4aa37836f103aebeefee2aa873200a08342be2ad Mon Sep 17 00:00:00 2001
From: Bojun Pan <bojunp@codeaurora.org>
Date: Thu, 30 Jan 2020 18:24:47 -0800
Subject: [PATCH] msm: ipa4: function prototype for new qmap flow control

Add new function prototype for rmnet_ctl module to support new
qmap flow control with new IPA pipes.

Change-Id: I5b2cfa5c7575dc67096cc11fd74402946fb71617
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>
---
 include/linux/ipa.h | 82 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 81 insertions(+), 1 deletion(-)

diff --git a/include/linux/ipa.h b/include/linux/ipa.h
index f6810c9029ef..060f90c6ef55 100644
--- a/include/linux/ipa.h
+++ b/include/linux/ipa.h
@@ -829,7 +829,6 @@ struct ipa_rx_page_data {
 	bool is_tmp_alloc;
 };
 
-
 /**
  * enum ipa_irq_type - IPA Interrupt Type
  * Used to register handlers for IPA interrupts
@@ -1508,6 +1507,18 @@ int ipa_set_single_ndp_per_mbim(bool enable);
 int ipa_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
 		struct ipa_tx_meta *metadata);
 
+/*
+ * ipa_rmnet_ctl_xmit - QMAP Flow control TX
+ *
+ * @skb - tx QMAP control packet
+ *
+ * Note: This need to be called after client receive rmnet_ctl_
+ * ready_cb and want to send TX flow control message.
+ *
+ * This funciton will return 0 on success, -EAGAIN if pipe if full.
+ */
+int ipa_rmnet_ctl_xmit(struct sk_buff *skb);
+
 /*
  * To transfer multiple data packets
  * While passing the data descriptor list, the anchor node
@@ -1700,6 +1711,12 @@ int ipa_stop_gsi_channel(u32 clnt_hdl);
 
 typedef void (*ipa_ready_cb)(void *user_data);
 
+typedef void (*ipa_rmnet_ctl_ready_cb)(void *user_data);
+
+typedef void (*ipa_rmnet_ctl_stop_cb)(void *user_data);
+
+typedef void (*ipa_rmnet_ctl_rx_notify_cb)(void *user_data, void *rx_data);
+
 /**
  * ipa_register_ipa_ready_cb() - register a callback to be invoked
  * when IPA core driver initialization is complete.
@@ -1722,6 +1739,45 @@ typedef void (*ipa_ready_cb)(void *user_data);
 int ipa_register_ipa_ready_cb(void (*ipa_ready_cb)(void *user_data),
 			      void *user_data);
 
+/**
+ * ipa_register_rmnet_ctl_cb() - register callbacks to be invoked
+ * to rmnet_ctl for qmap flow control pipes setup/teardown/rx_notify.
+ *
+ * @ipa_rmnet_ctl_ready_cb:  CB to be called when pipes setup.
+ * @user_data1: user_data for ipa_rmnet_ctl_ready_cb.
+ * @ipa_rmnet_ctl_stop_cb: CB to be called when pipes teardown.
+ * @user_data2: user_data for ipa_rmnet_ctl_stop_cb.
+ * @ipa_rmnet_ctl_rx_notify_cb: CB to be called when receive rx pkts.
+ * @user_data3: user_data for ipa_rmnet_ctl_rx_notify_cb.
+ * @rx_data: RX data buffer.
+ *
+ * Note: This function is expected to be utilized for rmnet_ctl
+ * module when new qmap flow control is enabled.
+ *
+ * The function will return 0 on success, -EAGAIN if IPA not ready,
+ * -ENXIO is feature is not enabled, -EEXIST if already called.
+ */
+int ipa_register_rmnet_ctl_cb(
+	void (*ipa_rmnet_ctl_ready_cb)(void *user_data1),
+	void *user_data1,
+	void (*ipa_rmnet_ctl_stop_cb)(void *user_data2),
+	void *user_data2,
+	void (*ipa_rmnet_ctl_rx_notify_cb)(void *user_data3, void *rx_data),
+	void *user_data3);
+
+/**
+ * ipa_unregister_rmnet_ctl_cb() - unregister callbacks to be
+ * invoked to rmnet_ctl for qmap flow control pipes
+ * setup/teardown/rx_notify.
+ *
+ * Note: This function is expected to be utilized for rmnet_ctl
+ * module when new qmap flow control is enabled.
+ *
+ * The function will return 0 on success, -EAGAIN if IPA not ready,
+ * -ENXIO is feature is not enabled.
+ */
+int ipa_unregister_rmnet_ctl_cb(void);
+
 /**
  * ipa_tz_unlock_reg - Unlocks memory regions so that they become accessible
  *	from AP.
@@ -2173,6 +2229,14 @@ static inline int ipa_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
 	return -EPERM;
 }
 
+/*
+ * QMAP Flow control TX
+ */
+static inline int ipa_rmnet_ctl_xmit(struct sk_buff *skb)
+{
+	return -EPERM;
+}
+
 /*
  * To transfer multiple data packets
  */
@@ -2591,6 +2655,22 @@ static inline int ipa_register_ipa_ready_cb(
 	return -EPERM;
 }
 
+static inline int ipa_register_rmnet_ctl_cb(
+	void (*ipa_rmnet_ctl_ready_cb)(void *user_data1),
+	void *user_data1,
+	void (*ipa_rmnet_ctl_stop_cb)(void *user_data2),
+	void *user_data2,
+	void (*ipa_rmnet_ctl_rx_notify_cb)(void *user_data3, void *rx_data),
+	void *user_data3)
+{
+	return -EPERM;
+}
+
+static inline int ipa_unregister_rmnet_ctl_cb(void)
+{
+	return -EPERM;
+}
+
 static inline int ipa_tz_unlock_reg(struct ipa_tz_unlock_reg_info *reg_info,
 	u16 num_regs)
 {