* [PATCH net v2 0/2] net: ixgbe: Use new flag to disable Relaxed Ordering
@ 2017-08-17 3:25 Ding Tianhong
2017-08-17 3:25 ` [PATCH net v2 1/2] Revert commit 1a8b6d76dc5b ("net:add one common config...") Ding Tianhong
2017-08-17 3:25 ` [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag Ding Tianhong
0 siblings, 2 replies; 8+ messages in thread
From: Ding Tianhong @ 2017-08-17 3:25 UTC (permalink / raw)
To: davem, jeffrey.t.kirsher, keescook, linux-kernel, sparclinux,
intel-wired-lan, alexander.duyck, netdev, linuxarm
Cc: Ding Tianhong
The new flag PCI_DEV_FLAGS_NO_RELAXED_ORDERING has been added
to indicate that Relaxed Ordering Attributes (RO) should not
be used for Transaction Layer Packets (TLP) targeted toward
these affected Root Port, it will clear the bit4 in the PCIe
Device Control register, so the PCIe device drivers could
query PCIe configuration space to determine if it can send
TLPs to Root Port with the Relaxed Ordering Attributes set.
The ixgbe driver could use this flag to determine if it can
send TLPs to Root Port with the Relaxed Ordering Attributes set.
v2: Simplify the original program according Alex's suggestion,
remove the new ixgbe flag2 and only check the bit4 in the
PCIe Device Control register.
Ding Tianhong (2):
Revert commit 1a8b6d76dc5b ("net:add one common config...")
net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag
arch/Kconfig | 3 --
arch/sparc/Kconfig | 1 -
drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c | 37 ++++++++++++-------------
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 32 +++++++++++----------
4 files changed, 35 insertions(+), 38 deletions(-)
--
1.8.3.1
^ permalink raw reply [flat|nested] 8+ messages in thread* [PATCH net v2 1/2] Revert commit 1a8b6d76dc5b ("net:add one common config...") 2017-08-17 3:25 [PATCH net v2 0/2] net: ixgbe: Use new flag to disable Relaxed Ordering Ding Tianhong @ 2017-08-17 3:25 ` Ding Tianhong 2017-08-17 3:25 ` [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag Ding Tianhong 1 sibling, 0 replies; 8+ messages in thread From: Ding Tianhong @ 2017-08-17 3:25 UTC (permalink / raw) To: davem, jeffrey.t.kirsher, keescook, linux-kernel, sparclinux, intel-wired-lan, alexander.duyck, netdev, linuxarm Cc: Ding Tianhong The new flag PCI_DEV_FLAGS_NO_RELAXED_ORDERING has been added to indicate that Relaxed Ordering Attributes (RO) should not be used for Transaction Layer Packets (TLP) targeted toward these affected Root Port, it will clear the bit4 in the PCIe Device Control register, so the PCIe device drivers could query PCIe configuration space to determine if it can send TLPs to Root Port with the Relaxed Ordering Attributes set. With this new flag we don't need the config ARCH_WANT_RELAX_ORDER to control the Relaxed Ordering Attributes for the ixgbe drivers just like the commit 1a8b6d76dc5b ("net:add one common config...") did, so revert this commit. Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> --- arch/Kconfig | 3 --- arch/sparc/Kconfig | 1 - drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 2 +- 3 files changed, 1 insertion(+), 5 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 21d0089..00cfc63 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -928,9 +928,6 @@ config STRICT_MODULE_RWX and non-text memory will be made non-executable. This provides protection against certain security exploits (e.g. writing to text) -config ARCH_WANT_RELAX_ORDER - bool - config REFCOUNT_FULL bool "Perform full reference count validation at the expense of speed" help diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index a4a6261..987a575 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -44,7 +44,6 @@ config SPARC select ARCH_HAS_SG_CHAIN select CPU_NO_EFFICIENT_FFS select LOCKDEP_SMALL if LOCKDEP - select ARCH_WANT_RELAX_ORDER config SPARC32 def_bool !64BIT diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c index 4e35e70..d4933d2 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c @@ -350,7 +350,7 @@ s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw) } IXGBE_WRITE_FLUSH(hw); -#ifndef CONFIG_ARCH_WANT_RELAX_ORDER +#ifndef CONFIG_SPARC /* Disable relaxed ordering */ for (i = 0; i < hw->mac.max_tx_queues; i++) { u32 regval; -- 1.8.3.1 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-17 3:25 [PATCH net v2 0/2] net: ixgbe: Use new flag to disable Relaxed Ordering Ding Tianhong 2017-08-17 3:25 ` [PATCH net v2 1/2] Revert commit 1a8b6d76dc5b ("net:add one common config...") Ding Tianhong @ 2017-08-17 3:25 ` Ding Tianhong 2017-08-17 14:17 ` Tantilov, Emil S 2017-08-19 22:10 ` kbuild test robot 1 sibling, 2 replies; 8+ messages in thread From: Ding Tianhong @ 2017-08-17 3:25 UTC (permalink / raw) To: davem, jeffrey.t.kirsher, keescook, linux-kernel, sparclinux, intel-wired-lan, alexander.duyck, netdev, linuxarm Cc: Ding Tianhong The ixgbe driver use the compile check to determine if it can send TLPs to Root Port with the Relaxed Ordering Attribute set, this is too inconvenient, now the new flag PCI_DEV_FLAGS_NO_RELAXED_ORDERING has been added to the kernel and we could check the bit4 in the PCIe Device Control register to determine whether we should use the Relaxed Ordering Attributes or not, so use this new way in the ixgbe driver. Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> --- drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c | 37 ++++++++++++------------- drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 32 +++++++++++---------- 2 files changed, 35 insertions(+), 34 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c index 523f9d0..d1571e3 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c @@ -175,31 +175,30 @@ static s32 ixgbe_init_phy_ops_82598(struct ixgbe_hw *hw) **/ static s32 ixgbe_start_hw_82598(struct ixgbe_hw *hw) { -#ifndef CONFIG_SPARC - u32 regval; - u32 i; -#endif + u32 regval, i; s32 ret_val; + struct ixgbe_adapter *adapter = hw->back; ret_val = ixgbe_start_hw_generic(hw); -#ifndef CONFIG_SPARC - /* Disable relaxed ordering */ - for (i = 0; ((i < hw->mac.max_tx_queues) && - (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { - regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); - regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; - IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); - } + if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { + /* Disable relaxed ordering */ + for (i = 0; ((i < hw->mac.max_tx_queues) && + (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { + regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); + regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; + IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); + } - for (i = 0; ((i < hw->mac.max_rx_queues) && - (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { - regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i)); - regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN | - IXGBE_DCA_RXCTRL_HEAD_WRO_EN); - IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval); + for (i = 0; ((i < hw->mac.max_rx_queues) && + (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { + regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i)); + regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN | + IXGBE_DCA_RXCTRL_HEAD_WRO_EN); + IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval); + } } -#endif + if (ret_val) return ret_val; diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c index d4933d2..d1052ee 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c @@ -342,6 +342,7 @@ s32 ixgbe_start_hw_generic(struct ixgbe_hw *hw) s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw) { u32 i; + struct ixgbe_adapter *adapter = hw->back; /* Clear the rate limiters */ for (i = 0; i < hw->mac.max_tx_queues; i++) { @@ -350,25 +351,26 @@ s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw) } IXGBE_WRITE_FLUSH(hw); -#ifndef CONFIG_SPARC - /* Disable relaxed ordering */ - for (i = 0; i < hw->mac.max_tx_queues; i++) { - u32 regval; + if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { + /* Disable relaxed ordering */ + for (i = 0; i < hw->mac.max_tx_queues; i++) { + u32 regval; - regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i)); - regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; - IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval); - } + regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i)); + regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; + IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval); + } - for (i = 0; i < hw->mac.max_rx_queues; i++) { - u32 regval; + for (i = 0; i < hw->mac.max_rx_queues; i++) { + u32 regval; - regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i)); - regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN | - IXGBE_DCA_RXCTRL_HEAD_WRO_EN); - IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval); + regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i)); + regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN | + IXGBE_DCA_RXCTRL_HEAD_WRO_EN); + IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval); + } } -#endif + return 0; } -- 1.8.3.1 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* RE: [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-17 3:25 ` [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag Ding Tianhong @ 2017-08-17 14:17 ` Tantilov, Emil S 2017-08-18 0:39 ` Ding Tianhong 2017-08-19 22:10 ` kbuild test robot 1 sibling, 1 reply; 8+ messages in thread From: Tantilov, Emil S @ 2017-08-17 14:17 UTC (permalink / raw) To: Ding Tianhong, davem@davemloft.net, Kirsher, Jeffrey T, keescook@chromium.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, intel-wired-lan@lists.osuosl.org, alexander.duyck@gmail.com, netdev@vger.kernel.org, linuxarm@huawei.com >-----Original Message----- >From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel- >owner@vger.kernel.org] On Behalf Of Ding Tianhong >Sent: Wednesday, August 16, 2017 8:25 PM >To: davem@davemloft.net; Kirsher, Jeffrey T <jeffrey.t.kirsher@intel.com>; >keescook@chromium.org; linux-kernel@vger.kernel.org; >sparclinux@vger.kernel.org; intel-wired-lan@lists.osuosl.org; >alexander.duyck@gmail.com; netdev@vger.kernel.org; linuxarm@huawei.com >Cc: Ding Tianhong <dingtianhong@huawei.com> >Subject: [PATCH net v2 2/2] net: ixgbe: Use new >PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag > >The ixgbe driver use the compile check to determine if it can >send TLPs to Root Port with the Relaxed Ordering Attribute set, >this is too inconvenient, now the new flag >PCI_DEV_FLAGS_NO_RELAXED_ORDERING >has been added to the kernel and we could check the bit4 in the PCIe >Device Control register to determine whether we should use the Relaxed >Ordering Attributes or not, so use this new way in the ixgbe driver. > >Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> >--- > drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c | 37 ++++++++++++--------- >---- > drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 32 +++++++++++---------- > 2 files changed, 35 insertions(+), 34 deletions(-) > >diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c >b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c >index 523f9d0..d1571e3 100644 >--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c >+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c >@@ -175,31 +175,30 @@ static s32 ixgbe_init_phy_ops_82598(struct ixgbe_hw >*hw) > **/ > static s32 ixgbe_start_hw_82598(struct ixgbe_hw *hw) > { >-#ifndef CONFIG_SPARC >- u32 regval; >- u32 i; >-#endif >+ u32 regval, i; > s32 ret_val; >+ struct ixgbe_adapter *adapter = hw->back; > > ret_val = ixgbe_start_hw_generic(hw); > >-#ifndef CONFIG_SPARC >- /* Disable relaxed ordering */ >- for (i = 0; ((i < hw->mac.max_tx_queues) && >- (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { >- regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); >- regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; >- IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); >- } >+ if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { As Alex mentioned there is no need for this check in any form. The HW defaults to Relaxed Ordering enabled unless it is disabled in the PCIe Device Control Register. So the above logic is already done by HW. All you have to do is strip the code disabling relaxed ordering. Thanks, Emil ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-17 14:17 ` Tantilov, Emil S @ 2017-08-18 0:39 ` Ding Tianhong 2017-08-18 5:04 ` Tantilov, Emil S 0 siblings, 1 reply; 8+ messages in thread From: Ding Tianhong @ 2017-08-18 0:39 UTC (permalink / raw) To: Tantilov, Emil S, davem@davemloft.net, Kirsher, Jeffrey T, keescook@chromium.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, intel-wired-lan@lists.osuosl.org, alexander.duyck@gmail.com, netdev@vger.kernel.org, linuxarm@huawei.com On 2017/8/17 22:17, Tantilov, Emil S wrote: >> ret_val = ixgbe_start_hw_generic(hw); >> >> -#ifndef CONFIG_SPARC >> - /* Disable relaxed ordering */ >> - for (i = 0; ((i < hw->mac.max_tx_queues) && >> - (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { >> - regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); >> - regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; >> - IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); >> - } >> + if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { > > As Alex mentioned there is no need for this check in any form. > > The HW defaults to Relaxed Ordering enabled unless it is disabled in > the PCIe Device Control Register. So the above logic is already done by HW. > > All you have to do is strip the code disabling relaxed ordering. > Hi Tantilov: I misunderstood Alex's suggestion, But I still couldn't find the logic where the HW disable the Relaxed Ordering when the PCIe Device Control Register disable it, can you point it out? Thanks Ding > Thanks, > Emil > > > . > ^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-18 0:39 ` Ding Tianhong @ 2017-08-18 5:04 ` Tantilov, Emil S 2017-08-18 5:50 ` Ding Tianhong 0 siblings, 1 reply; 8+ messages in thread From: Tantilov, Emil S @ 2017-08-18 5:04 UTC (permalink / raw) To: Ding Tianhong, davem@davemloft.net, Kirsher, Jeffrey T, keescook@chromium.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, intel-wired-lan@lists.osuosl.org, alexander.duyck@gmail.com, netdev@vger.kernel.org, linuxarm@huawei.com >-----Original Message----- >From: Ding Tianhong [mailto:dingtianhong@huawei.com] >Sent: Thursday, August 17, 2017 5:39 PM >To: Tantilov, Emil S <emil.s.tantilov@intel.com>; davem@davemloft.net; >Kirsher, Jeffrey T <jeffrey.t.kirsher@intel.com>; keescook@chromium.org; >linux-kernel@vger.kernel.org; sparclinux@vger.kernel.org; intel-wired- >lan@lists.osuosl.org; alexander.duyck@gmail.com; netdev@vger.kernel.org; >linuxarm@huawei.com >Subject: Re: [PATCH net v2 2/2] net: ixgbe: Use new >PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag > > > >On 2017/8/17 22:17, Tantilov, Emil S wrote: > >>> ret_val = ixgbe_start_hw_generic(hw); >>> >>> -#ifndef CONFIG_SPARC >>> - /* Disable relaxed ordering */ >>> - for (i = 0; ((i < hw->mac.max_tx_queues) && >>> - (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { >>> - regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); >>> - regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; >>> - IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); >>> - } >>> + if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { >> >> As Alex mentioned there is no need for this check in any form. >> >> The HW defaults to Relaxed Ordering enabled unless it is disabled in >> the PCIe Device Control Register. So the above logic is already done by >HW. >> >> All you have to do is strip the code disabling relaxed ordering. >> > >Hi Tantilov: > >I misunderstood Alex's suggestion, But I still couldn't find the logic >where >the HW disable the Relaxed Ordering when the PCIe Device Control Register >disable it, can you point it out? If you look at the datasheet (82599) - the description of CTRL_EXT.RO_DIS (bit 17, 0b): Relaxed Ordering Disable. When set to 1b, the device does not request any relaxed ordering transactions. When this bit is cleared and the Enable Relaxed Ordering bit in the Device Control register is set, the device requests relaxed ordering transactions per queues as configured in the DCA_RXCTRL[n] and DCA_TXCTRL[n] registers. So if you remove the code that clears the bits in DCA_T/RXCTRL relaxed ordering should be enabled by HW when the bus allows it. Thanks, Emil ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-18 5:04 ` Tantilov, Emil S @ 2017-08-18 5:50 ` Ding Tianhong 0 siblings, 0 replies; 8+ messages in thread From: Ding Tianhong @ 2017-08-18 5:50 UTC (permalink / raw) To: Tantilov, Emil S, davem@davemloft.net, Kirsher, Jeffrey T, keescook@chromium.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, intel-wired-lan@lists.osuosl.org, alexander.duyck@gmail.com, netdev@vger.kernel.org, linuxarm@huawei.com On 2017/8/18 13:04, Tantilov, Emil S wrote: >> -----Original Message----- >> From: Ding Tianhong [mailto:dingtianhong@huawei.com] >> Sent: Thursday, August 17, 2017 5:39 PM >> To: Tantilov, Emil S <emil.s.tantilov@intel.com>; davem@davemloft.net; >> Kirsher, Jeffrey T <jeffrey.t.kirsher@intel.com>; keescook@chromium.org; >> linux-kernel@vger.kernel.org; sparclinux@vger.kernel.org; intel-wired- >> lan@lists.osuosl.org; alexander.duyck@gmail.com; netdev@vger.kernel.org; >> linuxarm@huawei.com >> Subject: Re: [PATCH net v2 2/2] net: ixgbe: Use new >> PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag >> >> >> >> On 2017/8/17 22:17, Tantilov, Emil S wrote: >> >>>> ret_val = ixgbe_start_hw_generic(hw); >>>> >>>> -#ifndef CONFIG_SPARC >>>> - /* Disable relaxed ordering */ >>>> - for (i = 0; ((i < hw->mac.max_tx_queues) && >>>> - (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) { >>>> - regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i)); >>>> - regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; >>>> - IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval); >>>> - } >>>> + if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { >>> >>> As Alex mentioned there is no need for this check in any form. >>> >>> The HW defaults to Relaxed Ordering enabled unless it is disabled in >>> the PCIe Device Control Register. So the above logic is already done by >> HW. >>> >>> All you have to do is strip the code disabling relaxed ordering. >>> >> >> Hi Tantilov: >> >> I misunderstood Alex's suggestion, But I still couldn't find the logic >> where >> the HW disable the Relaxed Ordering when the PCIe Device Control Register >> disable it, can you point it out? > > If you look at the datasheet (82599) - the description of CTRL_EXT.RO_DIS (bit 17, 0b): > > Relaxed Ordering Disable. When set to 1b, the device does not request any relaxed > ordering transactions. When this bit is cleared and the Enable Relaxed Ordering bit in > the Device Control register is set, the device requests relaxed ordering transactions per queues as configured in the DCA_RXCTRL[n] and DCA_TXCTRL[n] registers. > > So if you remove the code that clears the bits in DCA_T/RXCTRL relaxed ordering should > be enabled by HW when the bus allows it. > Great, Thanks for your explanation. > Thanks, > Emil > > > . > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag 2017-08-17 3:25 ` [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag Ding Tianhong 2017-08-17 14:17 ` Tantilov, Emil S @ 2017-08-19 22:10 ` kbuild test robot 1 sibling, 0 replies; 8+ messages in thread From: kbuild test robot @ 2017-08-19 22:10 UTC (permalink / raw) To: Ding Tianhong Cc: kbuild-all, davem, jeffrey.t.kirsher, keescook, linux-kernel, sparclinux, intel-wired-lan, alexander.duyck, netdev, linuxarm, Ding Tianhong [-- Attachment #1: Type: text/plain, Size: 2942 bytes --] Hi Ding, [auto build test ERROR on net/master] url: https://github.com/0day-ci/linux/commits/Ding-Tianhong/Revert-commit-1a8b6d76dc5b-net-add-one-common-config/20170820-053530 config: i386-randconfig-x011-201734 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): drivers/net//ethernet/intel/ixgbe/ixgbe_common.c: In function 'ixgbe_start_hw_gen2': >> drivers/net//ethernet/intel/ixgbe/ixgbe_common.c:354:7: error: implicit declaration of function 'pcie_relaxed_ordering_enabled' [-Werror=implicit-function-declaration] if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- drivers/net//ethernet/intel/ixgbe/ixgbe_82598.c: In function 'ixgbe_start_hw_82598': >> drivers/net//ethernet/intel/ixgbe/ixgbe_82598.c:184:7: error: implicit declaration of function 'pcie_relaxed_ordering_enabled' [-Werror=implicit-function-declaration] if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/pcie_relaxed_ordering_enabled +354 drivers/net//ethernet/intel/ixgbe/ixgbe_common.c 331 332 /** 333 * ixgbe_start_hw_gen2 - Init sequence for common device family 334 * @hw: pointer to hw structure 335 * 336 * Performs the init sequence common to the second generation 337 * of 10 GbE devices. 338 * Devices in the second generation: 339 * 82599 340 * X540 341 **/ 342 s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw) 343 { 344 u32 i; 345 struct ixgbe_adapter *adapter = hw->back; 346 347 /* Clear the rate limiters */ 348 for (i = 0; i < hw->mac.max_tx_queues; i++) { 349 IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i); 350 IXGBE_WRITE_REG(hw, IXGBE_RTTBCNRC, 0); 351 } 352 IXGBE_WRITE_FLUSH(hw); 353 > 354 if (!pcie_relaxed_ordering_enabled(adapter->pdev)) { 355 /* Disable relaxed ordering */ 356 for (i = 0; i < hw->mac.max_tx_queues; i++) { 357 u32 regval; 358 359 regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i)); 360 regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN; 361 IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval); 362 } 363 364 for (i = 0; i < hw->mac.max_rx_queues; i++) { 365 u32 regval; 366 367 regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i)); 368 regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN | 369 IXGBE_DCA_RXCTRL_HEAD_WRO_EN); 370 IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval); 371 } 372 } 373 374 return 0; 375 } 376 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation [-- Attachment #2: .config.gz --] [-- Type: application/gzip, Size: 30251 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
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Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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2017-08-17 3:25 [PATCH net v2 0/2] net: ixgbe: Use new flag to disable Relaxed Ordering Ding Tianhong
2017-08-17 3:25 ` [PATCH net v2 1/2] Revert commit 1a8b6d76dc5b ("net:add one common config...") Ding Tianhong
2017-08-17 3:25 ` [PATCH net v2 2/2] net: ixgbe: Use new PCI_DEV_FLAGS_NO_RELAXED_ORDERING flag Ding Tianhong
2017-08-17 14:17 ` Tantilov, Emil S
2017-08-18 0:39 ` Ding Tianhong
2017-08-18 5:04 ` Tantilov, Emil S
2017-08-18 5:50 ` Ding Tianhong
2017-08-19 22:10 ` kbuild test robot
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