| Message ID | 20231029110442.347448-5-mirsad.todorovac@alu.unizg.hr (mailing list archive) |
|---|---|
| State | Changes Requested |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v4,1/5] r8169: Coalesce r8169_mac_ocp_write/modify calls to reduce spinlock stalls | expand |
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 --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); }
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(-)