RE: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
> -Original Message- > From: Intel-wired-lan [mailto:intel-wired-lan-boun...@lists.osuosl.org] On > Behalf Of Neftin, Sasha > Sent: Monday, February 27, 2017 12:40 AM > To: Bernd Faust <berndfa...@gmail.com>; Kirsher, Jeffrey T > <jeffrey.t.kirs...@intel.com>; intel-wired-...@lists.osuosl.org; > netdev@vger.kernel.org; linux-ker...@vger.kernel.org > Subject: Re: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit > Ethernet controller > > On 2/26/2017 11:08, Neftin, Sasha wrote: > > On 2/19/2017 14:55, Neftin, Sasha wrote: > >> On 2/16/2017 20:42, Bernd Faust wrote: > >>> After an upgrade to Linux kernel v4.x the hardware timestamps of the > >>> 82579 Gigabit Ethernet Controller are different than expected. > >>> The values that are being read are almost four times as big as before > >>> the kernel upgrade. > >>> > >>> The difference is that after the upgrade the driver sets the clock > >>> frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel > >>> confirmed that the correct frequency for this network adapter is 96MHz. > >>> > >>> Signed-off-by: Bernd Faust <berndfa...@gmail.com> > >>> --- > >>> drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++ > >>> 1 file changed, 6 insertions(+) > >>> > >>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c > >>> b/drivers/net/ethernet/intel/e1000e/netdev.c > >>> index 7017281..8b7113d 100644 > >>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c > >>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c > >>> @@ -3511,6 +3511,12 @@ s32 e1000e_get_base_timinca(struct > >>> e1000_adapter *adapter, u32 *timinca) > >>> > >>> switch (hw->mac.type) { > >>> case e1000_pch2lan: > >>> +/* Stable 96MHz frequency */ > >>> +incperiod = INCPERIOD_96MHz; > >>> +incvalue = INCVALUE_96MHz; > >>> +shift = INCVALUE_SHIFT_96MHz; > >>> +adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; > >>> +break; > >>> case e1000_pch_lpt: > >>> if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) { > >>> /* Stable 96MHz frequency */ > >>> -- > >>> 2.7.4 > >>> ___ > >>> Intel-wired-lan mailing list > >>> intel-wired-...@lists.osuosl.org > >>> http://lists.osuosl.org/mailman/listinfo/intel-wired-lan > >> > >> Hello, > >> > >> e1000_pch2lan mac type corresponds to 82579LM and 82579V network > >> adapters. System clock frequency indication (SYSCFI) for these > >> devices supports both 25MHz and 96MHz frequency. By default > >> TSYNCRXCTL.SYSCFI is set to 1 and that means 96MHz frequency is picked. > >> > >> It is better to keep the current implementation as it covers all > >> options. > >> > >> Thanks, > >> > >> Sasha > >> > > Hello, > > > > During last couple of weeks I saw few complaints from community on > > same timing problem with 82579. I will double check clock definition > > with HW architecture. > > > > Sasha > > > I've double checked - 82579 support 96MHz frequency only. So, let's > accept this suggestion to upstream. > > Ack. > This resolves also a complaint from someone on the LinuxPTP development mailing list. ACK. Thanks, Jake
Re: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
On 2/26/2017 11:08, Neftin, Sasha wrote: On 2/19/2017 14:55, Neftin, Sasha wrote: On 2/16/2017 20:42, Bernd Faust wrote: After an upgrade to Linux kernel v4.x the hardware timestamps of the 82579 Gigabit Ethernet Controller are different than expected. The values that are being read are almost four times as big as before the kernel upgrade. The difference is that after the upgrade the driver sets the clock frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel confirmed that the correct frequency for this network adapter is 96MHz. Signed-off-by: Bernd Faust--- drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 7017281..8b7113d 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3511,6 +3511,12 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca) switch (hw->mac.type) { case e1000_pch2lan: +/* Stable 96MHz frequency */ +incperiod = INCPERIOD_96MHz; +incvalue = INCVALUE_96MHz; +shift = INCVALUE_SHIFT_96MHz; +adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; +break; case e1000_pch_lpt: if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) { /* Stable 96MHz frequency */ -- 2.7.4 ___ Intel-wired-lan mailing list intel-wired-...@lists.osuosl.org http://lists.osuosl.org/mailman/listinfo/intel-wired-lan Hello, e1000_pch2lan mac type corresponds to 82579LM and 82579V network adapters. System clock frequency indication (SYSCFI) for these devices supports both 25MHz and 96MHz frequency. By default TSYNCRXCTL.SYSCFI is set to 1 and that means 96MHz frequency is picked. It is better to keep the current implementation as it covers all options. Thanks, Sasha Hello, During last couple of weeks I saw few complaints from community on same timing problem with 82579. I will double check clock definition with HW architecture. Sasha I've double checked - 82579 support 96MHz frequency only. So, let's accept this suggestion to upstream. Ack.
Re: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
On 2/26/2017 11:08, Neftin, Sasha wrote: On 2/19/2017 14:55, Neftin, Sasha wrote: On 2/16/2017 20:42, Bernd Faust wrote: After an upgrade to Linux kernel v4.x the hardware timestamps of the 82579 Gigabit Ethernet Controller are different than expected. The values that are being read are almost four times as big as before the kernel upgrade. The difference is that after the upgrade the driver sets the clock frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel confirmed that the correct frequency for this network adapter is 96MHz. Signed-off-by: Bernd Faust--- drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 7017281..8b7113d 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3511,6 +3511,12 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca) switch (hw->mac.type) { case e1000_pch2lan: +/* Stable 96MHz frequency */ +incperiod = INCPERIOD_96MHz; +incvalue = INCVALUE_96MHz; +shift = INCVALUE_SHIFT_96MHz; +adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; +break; case e1000_pch_lpt: if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) { /* Stable 96MHz frequency */ -- 2.7.4 ___ Intel-wired-lan mailing list intel-wired-...@lists.osuosl.org http://lists.osuosl.org/mailman/listinfo/intel-wired-lan Hello, e1000_pch2lan mac type corresponds to 82579LM and 82579V network adapters. System clock frequency indication (SYSCFI) for these devices supports both 25MHz and 96MHz frequency. By default TSYNCRXCTL.SYSCFI is set to 1 and that means 96MHz frequency is picked. It is better to keep the current implementation as it covers all options. Thanks, Sasha Hello, During last couple of weeks I saw few complaints from community on same timing problem with 82579. I will double check clock definition with HW architecture. Sasha ___ Intel-wired-lan mailing list intel-wired-...@lists.osuosl.org http://lists.osuosl.org/mailman/listinfo/intel-wired-lan I've double checked - 82579 support 96MHz frequency only. So, let's accept this suggestion to upstream. Ack.
Re: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
On 2/19/2017 14:55, Neftin, Sasha wrote: On 2/16/2017 20:42, Bernd Faust wrote: After an upgrade to Linux kernel v4.x the hardware timestamps of the 82579 Gigabit Ethernet Controller are different than expected. The values that are being read are almost four times as big as before the kernel upgrade. The difference is that after the upgrade the driver sets the clock frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel confirmed that the correct frequency for this network adapter is 96MHz. Signed-off-by: Bernd Faust--- drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 7017281..8b7113d 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3511,6 +3511,12 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca) switch (hw->mac.type) { case e1000_pch2lan: +/* Stable 96MHz frequency */ +incperiod = INCPERIOD_96MHz; +incvalue = INCVALUE_96MHz; +shift = INCVALUE_SHIFT_96MHz; +adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; +break; case e1000_pch_lpt: if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) { /* Stable 96MHz frequency */ -- 2.7.4 ___ Intel-wired-lan mailing list intel-wired-...@lists.osuosl.org http://lists.osuosl.org/mailman/listinfo/intel-wired-lan Hello, e1000_pch2lan mac type corresponds to 82579LM and 82579V network adapters. System clock frequency indication (SYSCFI) for these devices supports both 25MHz and 96MHz frequency. By default TSYNCRXCTL.SYSCFI is set to 1 and that means 96MHz frequency is picked. It is better to keep the current implementation as it covers all options. Thanks, Sasha Hello, During last couple of weeks I saw few complaints from community on same timing problem with 82579. I will double check clock definition with HW architecture. Sasha
Re: [Intel-wired-lan] [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
On 2/16/2017 20:42, Bernd Faust wrote: After an upgrade to Linux kernel v4.x the hardware timestamps of the 82579 Gigabit Ethernet Controller are different than expected. The values that are being read are almost four times as big as before the kernel upgrade. The difference is that after the upgrade the driver sets the clock frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel confirmed that the correct frequency for this network adapter is 96MHz. Signed-off-by: Bernd Faust--- drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 7017281..8b7113d 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3511,6 +3511,12 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca) switch (hw->mac.type) { case e1000_pch2lan: + /* Stable 96MHz frequency */ + incperiod = INCPERIOD_96MHz; + incvalue = INCVALUE_96MHz; + shift = INCVALUE_SHIFT_96MHz; + adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; + break; case e1000_pch_lpt: if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) { /* Stable 96MHz frequency */ -- 2.7.4 ___ Intel-wired-lan mailing list intel-wired-...@lists.osuosl.org http://lists.osuosl.org/mailman/listinfo/intel-wired-lan Hello, e1000_pch2lan mac type corresponds to 82579LM and 82579V network adapters. System clock frequency indication (SYSCFI) for these devices supports both 25MHz and 96MHz frequency. By default TSYNCRXCTL.SYSCFI is set to 1 and that means 96MHz frequency is picked. It is better to keep the current implementation as it covers all options. Thanks, Sasha