linux-kernel - [PATCH net-next v6 3/5] r8169: Coalesce mac ocp write and modify for 8168H start to reduce spinlocks

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Message-Id: <20231104221514.45821-4-mirsad.todorovac@alu.unizg.hr>
Date:   Sat,  4 Nov 2023 23:15:17 +0100
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        nic_swsd@...ltek.com,
        Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
        Marco Elver <elver@...gle.com>,
        Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH net-next v6 3/5] r8169: Coalesce mac ocp write and modify for 8168H start to reduce spinlocks

Repeated calls to r8168_mac_ocp_write() and r8168_mac_ocp_modify() in
the startup of 8168H involve implicit spin_lock_irqsave() and spin_unlock_irqrestore()
on each invocation.

Coalesced with the corresponding helpers, r8168_mac_ocp_write_seq() and
r8168_mac_ocp_modify_seq() with a sinqle lock/unlock, these calls reduce overall
lock contention.

Fixes: ef712ede3541d ("r8169: add helper r8168_mac_ocp_modify")
Fixes: 6e1d0b8988188 ("r8169:add support for RTL8168H and RTL8107E")
Cc: Heiner Kallweit <hkallweit1@...il.com>
Cc: Marco Elver <elver@...gle.com>
Cc: nic_swsd@...ltek.com
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Link: https://lore.kernel.org/lkml/20231028005153.2180411-1-mirsad.todorovac@alu.unizg.hr/
Link: https://lore.kernel.org/lkml/20231028110459.2644926-1-mirsad.todorovac@alu.unizg.hr/
Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 26 +++++++++++++++--------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 5515c51b6e3c..0fb34d217205 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -3227,6 +3227,21 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
 		{ 0x04, 0xffff,	0x854a },
 		{ 0x01, 0xffff,	0x068b }
 	};
+
+	static const struct e_info_regmaskset e_info_regmaskset_8168h_1[] = {
+		{ 0xe056, 0x00f0, 0x0070 },
+		{ 0xe052, 0x6000, 0x8008 },
+		{ 0xe0d6, 0x01ff, 0x017f },
+		{ 0xd420, 0x0fff, 0x047f },
+	};
+
+	static const struct e_info_regdata e_info_regdata_8168h_1[] = {
+		{ 0xe63e, 0x0001 },
+		{ 0xe63e, 0x0000 },
+		{ 0xc094, 0x0000 },
+		{ 0xc09e, 0x0000 },
+	};
+
 	int rg_saw_cnt;
 
 	rtl_ephy_init(tp, e_info_8168h_1);
@@ -3267,15 +3282,8 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
 		r8168_mac_ocp_modify(tp, 0xd412, 0x0fff, sw_cnt_1ms_ini);
 	}
 
-	r8168_mac_ocp_modify(tp, 0xe056, 0x00f0, 0x0070);
-	r8168_mac_ocp_modify(tp, 0xe052, 0x6000, 0x8008);
-	r8168_mac_ocp_modify(tp, 0xe0d6, 0x01ff, 0x017f);
-	r8168_mac_ocp_modify(tp, 0xd420, 0x0fff, 0x047f);
-
-	r8168_mac_ocp_write(tp, 0xe63e, 0x0001);
-	r8168_mac_ocp_write(tp, 0xe63e, 0x0000);
-	r8168_mac_ocp_write(tp, 0xc094, 0x0000);
-	r8168_mac_ocp_write(tp, 0xc09e, 0x0000);
+	r8168_mac_ocp_modify_seq(tp, e_info_regmaskset_8168h_1);
+	r8168_mac_ocp_write_seq(tp, e_info_regdata_8168h_1);
 }
 
 static void rtl_hw_start_8168ep(struct rtl8169_private *tp)
-- 
2.34.1