diff mbox series

[v4,5/5] r8169: Coalesce mac ocp commands for rtl_hw_init_8125 to reduce spinlocks

Message ID 20231029110442.347448-5-mirsad.todorovac@alu.unizg.hr
State New
Headers
Series [v4,1/5] r8169: Coalesce r8169_mac_ocp_write/modify calls to reduce spinlock stalls |

Commit Message

Mirsad Todorovac Oct. 29, 2023, 11:04 a.m. UTC 
  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>
---
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 | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Comments

Jacob Keller Oct. 30, 2023, 9:54 p.m. UTC | #1 
On 10/29/2023 4:04 AM, Mirsad Goran Todorovac wrote:
> 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>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index dd65e0384ab3..8dce08d90367 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5070,6 +5070,12 @@  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));
@@ -5079,9 +5085,7 @@  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);
 }