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From:   Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
To:     linux-kernel@vger.kernel.org
Cc:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        nic_swsd@realtek.com,
        Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>,
        Marco Elver <elver@google.com>,
        Jacob Keller <jacob.e.keller@intel.com>
Subject: [PATCH net-next v6 5/5] r8169: Coalesce mac ocp commands for rtl_hw_init_8125 to reduce spinlocks
Date:   Sat,  4 Nov 2023 23:15:21 +0100
Message-Id: <20231104221514.45821-6-mirsad.todorovac@alu.unizg.hr>
In-Reply-To: <20231104221514.45821-1-mirsad.todorovac@alu.unizg.hr>
References: <20231104221514.45821-1-mirsad.todorovac@alu.unizg.hr>
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Repeated calls to r8168_mac_ocp_write() and r8168_mac_ocp_modify() in
the init sequence of the 8125 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() into sequential write or modidy with a sinqle lock/unlock,
these calls reduce overall lock contention.

Fixes: f1bce4ad2f1ce ("r8169: add support for RTL8125")
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: Marco Elver <elver@google.com>
Cc: nic_swsd@realtek.com
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.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@alu.unizg.hr>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 056fe5b3930b..42f0a7486151 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5074,6 +5074,12 @@ static void rtl_hw_init_8168g(struct rtl8169_private *tp)
 
 static void rtl_hw_init_8125(struct rtl8169_private *tp)
 {
+	static const struct e_info_regdata hw_init_8125_1[] = {
+		{ 0xc0aa, 0x07d0 },
+		{ 0xc0a6, 0x0150 },
+		{ 0xc01e, 0x5555 },
+	};
+
 	rtl_enable_rxdvgate(tp);
 
 	RTL_W8(tp, ChipCmd, RTL_R8(tp, ChipCmd) & ~(CmdTxEnb | CmdRxEnb));
@@ -5083,9 +5089,7 @@ static void rtl_hw_init_8125(struct rtl8169_private *tp)
 	r8168_mac_ocp_modify(tp, 0xe8de, BIT(14), 0);
 	r8168g_wait_ll_share_fifo_ready(tp);
 
-	r8168_mac_ocp_write(tp, 0xc0aa, 0x07d0);
-	r8168_mac_ocp_write(tp, 0xc0a6, 0x0150);
-	r8168_mac_ocp_write(tp, 0xc01e, 0x5555);
+	r8168_mac_ocp_write_seq(tp, hw_init_8125_1);
 	r8168g_wait_ll_share_fifo_ready(tp);
 }
 
-- 
2.34.1