kmod-redhat-rtw89/SOURCES/0067-wifi-rtw89-check-if-atomic-before-queuing-c2h.patch

From 5e16e95dd7bc9379701e4f3c9ca091ca19149c26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=8D=C3=B1igo=20Huguet?= <ihuguet@redhat.com>
Date: Wed, 24 May 2023 15:00:30 +0200
Subject: [PATCH 067/142] wifi: rtw89: check if atomic before queuing c2h
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Bugzilla: https://bugzilla.redhat.com/2207499

commit 860e8263ae92667a2002163886fd2ebd8c67f699
Author: Zong-Zhe Yang <kevin_yang@realtek.com>
Date:   Tue Nov 29 16:31:26 2022 +0800

    wifi: rtw89: check if atomic before queuing c2h

    Before queuing C2H work, we check atomicity of the C2H's handler first now.
    If atomic or lock-free, handle it directly; otherwise, handle it with mutex
    in work as previous. This prepares for MAC MCC C2Hs which require to be
    processed directly. And, their handlers will be functions which can be
    considered atomic.

    Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
    Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
    Signed-off-by: Kalle Valo <kvalo@kernel.org>
    Link: https://lore.kernel.org/r/20221129083130.45708-3-pkshih@realtek.com

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
---
 drivers/net/wireless/realtek/rtw89/fw.c  | 47 +++++++++++++++++++++++++++++---
 drivers/net/wireless/realtek/rtw89/fw.h  | 14 ++++++++++
 drivers/net/wireless/realtek/rtw89/mac.c | 10 +++++++
 drivers/net/wireless/realtek/rtw89/mac.h |  1 +
 4 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/fw.c b/drivers/net/wireless/realtek/rtw89/fw.c
index 315f5c3a51dfc..ce71fc1a04a02 100644
--- a/drivers/net/wireless/realtek/rtw89/fw.c
+++ b/drivers/net/wireless/realtek/rtw89/fw.c
@@ -11,6 +11,9 @@
 #include "phy.h"
 #include "reg.h"
 
+static void rtw89_fw_c2h_cmd_handle(struct rtw89_dev *rtwdev,
+				    struct sk_buff *skb);
+
 static struct sk_buff *rtw89_fw_h2c_alloc_skb(struct rtw89_dev *rtwdev, u32 len,
 					      bool header)
 {
@@ -2382,8 +2385,43 @@ void rtw89_fw_free_all_early_h2c(struct rtw89_dev *rtwdev)
 	mutex_unlock(&rtwdev->mutex);
 }
 
+static void rtw89_fw_c2h_parse_attr(struct sk_buff *c2h)
+{
+	struct rtw89_fw_c2h_attr *attr = RTW89_SKB_C2H_CB(c2h);
+
+	attr->category = RTW89_GET_C2H_CATEGORY(c2h->data);
+	attr->class = RTW89_GET_C2H_CLASS(c2h->data);
+	attr->func = RTW89_GET_C2H_FUNC(c2h->data);
+	attr->len = RTW89_GET_C2H_LEN(c2h->data);
+}
+
+static bool rtw89_fw_c2h_chk_atomic(struct rtw89_dev *rtwdev,
+				    struct sk_buff *c2h)
+{
+	struct rtw89_fw_c2h_attr *attr = RTW89_SKB_C2H_CB(c2h);
+	u8 category = attr->category;
+	u8 class = attr->class;
+	u8 func = attr->func;
+
+	switch (category) {
+	default:
+		return false;
+	case RTW89_C2H_CAT_MAC:
+		return rtw89_mac_c2h_chk_atomic(rtwdev, class, func);
+	}
+}
+
 void rtw89_fw_c2h_irqsafe(struct rtw89_dev *rtwdev, struct sk_buff *c2h)
 {
+	rtw89_fw_c2h_parse_attr(c2h);
+	if (!rtw89_fw_c2h_chk_atomic(rtwdev, c2h))
+		goto enqueue;
+
+	rtw89_fw_c2h_cmd_handle(rtwdev, c2h);
+	dev_kfree_skb_any(c2h);
+	return;
+
+enqueue:
 	skb_queue_tail(&rtwdev->c2h_queue, c2h);
 	ieee80211_queue_work(rtwdev->hw, &rtwdev->c2h_work);
 }
@@ -2391,10 +2429,11 @@ void rtw89_fw_c2h_irqsafe(struct rtw89_dev *rtwdev, struct sk_buff *c2h)
 static void rtw89_fw_c2h_cmd_handle(struct rtw89_dev *rtwdev,
 				    struct sk_buff *skb)
 {
-	u8 category = RTW89_GET_C2H_CATEGORY(skb->data);
-	u8 class = RTW89_GET_C2H_CLASS(skb->data);
-	u8 func = RTW89_GET_C2H_FUNC(skb->data);
-	u16 len = RTW89_GET_C2H_LEN(skb->data);
+	struct rtw89_fw_c2h_attr *attr = RTW89_SKB_C2H_CB(skb);
+	u8 category = attr->category;
+	u8 class = attr->class;
+	u8 func = attr->func;
+	u16 len = attr->len;
 	bool dump = true;
 
 	if (!test_bit(RTW89_FLAG_RUNNING, rtwdev->flags))
diff --git a/drivers/net/wireless/realtek/rtw89/fw.h b/drivers/net/wireless/realtek/rtw89/fw.h
index 509a3eac5ffe3..d76d0c80f0256 100644
--- a/drivers/net/wireless/realtek/rtw89/fw.h
+++ b/drivers/net/wireless/realtek/rtw89/fw.h
@@ -2778,6 +2778,20 @@ static inline void RTW89_SET_FWCMD_TSF32_TOGL_EARLY(void *cmd, u32 val)
 #define RTW89_GET_C2H_LEN(c2h) \
 	le32_get_bits(*((const __le32 *)(c2h) + 1), GENMASK(13, 0))
 
+struct rtw89_fw_c2h_attr {
+	u8 category;
+	u8 class;
+	u8 func;
+	u16 len;
+};
+
+static inline struct rtw89_fw_c2h_attr *RTW89_SKB_C2H_CB(struct sk_buff *skb)
+{
+	static_assert(sizeof(skb->cb) >= sizeof(struct rtw89_fw_c2h_attr));
+
+	return (struct rtw89_fw_c2h_attr *)skb->cb;
+}
+
 #define RTW89_GET_C2H_LOG_SRT_PRT(c2h) (char *)((__le32 *)(c2h) + 2)
 #define RTW89_GET_C2H_LOG_LEN(len) ((len) - RTW89_C2H_HEADER_LEN)
 
diff --git a/drivers/net/wireless/realtek/rtw89/mac.c b/drivers/net/wireless/realtek/rtw89/mac.c
index 6587cdf6ba624..098637a848953 100644
--- a/drivers/net/wireless/realtek/rtw89/mac.c
+++ b/drivers/net/wireless/realtek/rtw89/mac.c
@@ -4208,6 +4208,16 @@ void (* const rtw89_mac_c2h_info_handler[])(struct rtw89_dev *rtwdev,
 	[RTW89_MAC_C2H_FUNC_BCN_CNT] = rtw89_mac_c2h_bcn_cnt,
 };
 
+bool rtw89_mac_c2h_chk_atomic(struct rtw89_dev *rtwdev, u8 class, u8 func)
+{
+	switch (class) {
+	default:
+		return false;
+	case RTW89_MAC_C2H_CLASS_MCC:
+		return true;
+	}
+}
+
 void rtw89_mac_c2h_handle(struct rtw89_dev *rtwdev, struct sk_buff *skb,
 			  u32 len, u8 class, u8 func)
 {
diff --git a/drivers/net/wireless/realtek/rtw89/mac.h b/drivers/net/wireless/realtek/rtw89/mac.h
index 045e8ec61a41e..82b9e81fe4744 100644
--- a/drivers/net/wireless/realtek/rtw89/mac.h
+++ b/drivers/net/wireless/realtek/rtw89/mac.h
@@ -894,6 +894,7 @@ static inline int rtw89_chip_disable_bb_rf(struct rtw89_dev *rtwdev)
 
 u32 rtw89_mac_get_err_status(struct rtw89_dev *rtwdev);
 int rtw89_mac_set_err_status(struct rtw89_dev *rtwdev, u32 err);
+bool rtw89_mac_c2h_chk_atomic(struct rtw89_dev *rtwdev, u8 class, u8 func);
 void rtw89_mac_c2h_handle(struct rtw89_dev *rtwdev, struct sk_buff *skb,
 			  u32 len, u8 class, u8 func);
 int rtw89_mac_setup_phycap(struct rtw89_dev *rtwdev);
-- 
2.13.6