linux-kernel - [PATCH v5 3/7] r8169: Coalesce mac ocp write and modify for 8168H start to reduce spinlock contention

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Message-Id: <20231029183600.451694-3-mirsad.todorovac@alu.unizg.hr>
Date:   Sun, 29 Oct 2023 19:35:59 +0100
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     Jason Gunthorpe <jgg@...pe.ca>, Joerg Roedel <jroedel@...e.de>,
        Lu Baolu <baolu.lu@...ux.intel.com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Heiner Kallweit <hkallweit1@...il.com>, nic_swsd@...ltek.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
        Marco Elver <elver@...gle.com>
Subject: [PATCH v5 3/7] r8169: Coalesce mac ocp write and modify for 8168H start to reduce spinlock contention

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 into r8168_mac_ocp_write_seq() and
r8168_mac_ocp_modify_seq() with a sinqle paired spin_lock_irqsave() and
spin_unlock_irqrestore(), these calls help reduce overall spinlock 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>
---
v5:
 added unlocked primitives to allow mac ocs modify grouping
 applied coalescing of mac ocp writes/modifies for 8168ep and 8117
 some formatting fixes to please checkpatch.pl

v4:
 fixed complaints as advised by Heiner and checkpatch.pl
 split the patch into five sections to be more easily manipulated and reviewed
 introduced r8168_mac_ocp_write_seq()
 applied coalescing of mac ocp writes/modifies for 8168H, 8125 and 8125B

v3:
 removed register/mask pair array sentinels, so using ARRAY_SIZE().
 avoided duplication of RTL_W32() call code as advised by Heiner.

 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 f4a1d1a74b8b..29ee93b8b702 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -3231,6 +3231,21 @@ 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);
@@ -3271,15 +3286,8 @@ 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