[dpdk-dev,v3] i40e: workaround for X710 performance issues

  On X710, performance number is far from the expectation on recent
firmware versions. The fix for this issue may not be integrated in
the following firmware version. So the workaround in software driver
is needed. It needs to modify the initial values of 3 internal only
registers. Note that the workaround can be removed when it is fixed
in firmware in the future.

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
---
 lib/librte_pmd_i40e/i40e_ethdev.c | 89 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

v2 changes:
* Added a compile error fix.

v3 changes:
* Used PRIx32 and PRIx64 instead for printing uint32_t and uint64_t
  variables.
* Re-worded annotations, and commit logs.
  

Hi Helin,

First, thank you and Jing for the excellent review process.

2014-12-16 16:23, Helin Zhang:
> On X710, performance number is far from the expectation on recent
> firmware versions. The fix for this issue may not be integrated in
> the following firmware version. So the workaround in software driver
> is needed. It needs to modify the initial values of 3 internal only
> registers. Note that the workaround can be removed when it is fixed
> in firmware in the future.

I want to understand something here. You say the workaround can be removed
when firmware will be fixed. But I suppose that some NICs won't be updated
so the workaround will be needed forever?
  

> -----Original Message-----
> From: Zhang, Helin
> Sent: Tuesday, December 16, 2014 4:23 PM
> To: dev@dpdk.org
> Cc: Chen, Jing D; Wu, Jingjing; Liu, Jijiang; Cao, Waterman; Lu, Patrick;
> Rowden, Aaron F; Zhang, Helin
> Subject: [PATCH v3] i40e: workaround for X710 performance issues
> 
> On X710, performance number is far from the expectation on recent
> firmware versions. The fix for this issue may not be integrated in
> the following firmware version. So the workaround in software driver
> is needed. It needs to modify the initial values of 3 internal only
> registers. Note that the workaround can be removed when it is fixed
> in firmware in the future.
> 
> Signed-off-by: Helin Zhang <helin.zhang@intel.com>
> ---
>  lib/librte_pmd_i40e/i40e_ethdev.c | 89
> +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 89 insertions(+)
> 
> v2 changes:
> * Added a compile error fix.
> 
> v3 changes:
> * Used PRIx32 and PRIx64 instead for printing uint32_t and uint64_t
>   variables.
> * Re-worded annotations, and commit logs.
> 
> diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c
> b/lib/librte_pmd_i40e/i40e_ethdev.c
> index 008d62c..624f0ce 100644
> --- a/lib/librte_pmd_i40e/i40e_ethdev.c
> +++ b/lib/librte_pmd_i40e/i40e_ethdev.c
> @@ -198,6 +198,7 @@ static int i40e_dev_filter_ctrl(struct rte_eth_dev *dev,
>  				enum rte_filter_type filter_type,
>  				enum rte_filter_op filter_op,
>  				void *arg);
> +static void i40e_configure_registers(struct i40e_hw *hw);
> 
>  /* Default hash key buffer for RSS */
>  static uint32_t rss_key_default[I40E_PFQF_HKEY_MAX_INDEX + 1];
> @@ -443,6 +444,16 @@ eth_i40e_dev_init(__rte_unused struct eth_driver
> *eth_drv,
>  	/* Clear PXE mode */
>  	i40e_clear_pxe_mode(hw);
> 
> +	/*
> +	 * On X710, performance number is far from the expectation on
> recent
> +	 * firmware versions. The fix for this issue may not be integrated in
> +	 * the following firmware version. So the workaround in software
> driver
> +	 * is needed. It needs to modify the initial values of 3 internal only
> +	 * registers. Note that the workaround can be removed when it is
> fixed
> +	 * in firmware in the future.
> +	 */
> +	i40e_configure_registers(hw);
> +
>  	/* Get hw capabilities */
>  	ret = i40e_get_cap(hw);
>  	if (ret != I40E_SUCCESS) {
> @@ -5294,3 +5305,81 @@ i40e_pctype_to_flowtype(enum
> i40e_filter_pctype pctype)
> 
>  	return flowtype_table[pctype];
>  }
> +
> +static int
> +i40e_debug_read_register(struct i40e_hw *hw, uint32_t addr, uint64_t
> *val)
> +{
> +	struct i40e_aq_desc desc;
> +	struct i40e_aqc_debug_reg_read_write *cmd =
> +		(struct i40e_aqc_debug_reg_read_write
> *)&desc.params.raw;
> +	enum i40e_status_code status;
> +
> +	i40e_fill_default_direct_cmd_desc(&desc,
> i40e_aqc_opc_debug_read_reg);
> +	cmd->address = rte_cpu_to_le_32(addr);
> +	status = i40e_asq_send_command(hw, &desc, NULL, 0, NULL);
> +	if (status < 0)
> +		return status;
> +
> +	*val = ((uint64_t)(rte_le_to_cpu_32(cmd->value_high)) <<
> (CHAR_BIT *
> +			sizeof(uint32_t))) + rte_le_to_cpu_32(cmd-
> >value_low);
> +
> +	return status;
> +}
> +
> +/*
> + * On X710, performance number is far from the expectation on recent
> firmware
> + * versions. The fix for this issue may not be integrated in the following
> + * firmware version. So the workaround in software driver is needed. It
> needs
> + * to modify the initial values of 3 internal only registers. Note that the
> + * workaround can be removed when it is fixed in firmware in the future.
> + */
> +static void
> +i40e_configure_registers(struct i40e_hw *hw)
> +{
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0       0x26CE00
> +#define I40E_GL_SWR_PRI_JOIN_MAP_2       0x26CE08
> +#define I40E_GL_SWR_PM_UP_THR            0x269FBC
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE 0x10000200
> +#define I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE 0x011f0200
> +#define I40E_GL_SWR_PM_UP_THR_VALUE      0x03030303
> +
> +	static const struct {
> +		uint32_t addr;
> +		uint64_t val;
> +	} reg_table[] = {
> +		{I40E_GL_SWR_PRI_JOIN_MAP_0,
> I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE},
> +		{I40E_GL_SWR_PRI_JOIN_MAP_2,
> I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE},
> +		{I40E_GL_SWR_PM_UP_THR,
> I40E_GL_SWR_PM_UP_THR_VALUE},
> +	};
> +	uint64_t reg;
> +	uint32_t i;
> +	int ret;
> +
> +	/* Below fix is for X710 only */
> +	if (i40e_is_40G_device(hw->device_id))
> +		return;
> +
> +	for (i = 0; i < RTE_DIM(reg_table); i++) {
> +		ret = i40e_debug_read_register(hw, reg_table[i].addr, &reg);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to read from
> 0x%"PRIx32,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Read from 0x%"PRIx32":
> 0x%"PRIx64,
> +						reg_table[i].addr, reg);
> +		if (reg == reg_table[i].val)
> +			continue;
> +
> +		ret = i40e_aq_debug_write_register(hw, reg_table[i].addr,
> +						reg_table[i].val, NULL);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to write 0x%"PRIx64" to
> the "
> +				"address of 0x%"PRIx32, reg_table[i].val,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Write 0x%"PRIx64" to the address
> of "
> +			"0x%"PRIx32, reg_table[i].val, reg_table[i].addr);
> +	}
> +}
> --
> 1.8.1.4


Acked-by: Jing Chen <jing.d.chen@intel.com>
  

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Tuesday, December 16, 2014 4:37 PM
> To: Zhang, Helin
> Cc: dev@dpdk.org; Rowden, Aaron F; Chen, Jing D
> Subject: Re: [dpdk-dev] [PATCH v3] i40e: workaround for X710 performance
> issues
> 
> Hi Helin,
> 
> First, thank you and Jing for the excellent review process.
> 
> 2014-12-16 16:23, Helin Zhang:
> > On X710, performance number is far from the expectation on recent
> > firmware versions. The fix for this issue may not be integrated in the
> > following firmware version. So the workaround in software driver is
> > needed. It needs to modify the initial values of 3 internal only
> > registers. Note that the workaround can be removed when it is fixed in
> > firmware in the future.
> 
> I want to understand something here. You say the workaround can be removed
> when firmware will be fixed. But I suppose that some NICs won't be updated so
> the workaround will be needed forever?
Yes, it is possible. Let me check with our NIC marketing guys of their firmware update strategy before removing it.
Now it is quite useful for high performance. Thank you very much for pointing out this!

Regards,
Helin

> 
> --
> Thomas
  

> > On X710, performance number is far from the expectation on recent
> > firmware versions. The fix for this issue may not be integrated in
> > the following firmware version. So the workaround in software driver
> > is needed. It needs to modify the initial values of 3 internal only
> > registers. Note that the workaround can be removed when it is fixed
> > in firmware in the future.
> > 
> > Signed-off-by: Helin Zhang <helin.zhang@intel.com>
> 
> Acked-by: Jing Chen <jing.d.chen@intel.com>

Applied

Thanks
  

> -----Original Message-----
> From: Zhang, Helin
> Sent: Tuesday, December 16, 2014 4:23 PM
> To: dev@dpdk.org
> Cc: Chen, Jing D; Wu, Jingjing; Liu, Jijiang; Cao, Waterman; Lu, Patrick;
> Rowden, Aaron F; Zhang, Helin
> Subject: [PATCH v3] i40e: workaround for X710 performance issues
> 
> On X710, performance number is far from the expectation on recent
> firmware versions. The fix for this issue may not be integrated in the
> following firmware version. So the workaround in software driver is needed.
> It needs to modify the initial values of 3 internal only registers. Note that the
> workaround can be removed when it is fixed in firmware in the future.
> 
> Signed-off-by: Helin Zhang <helin.zhang@intel.com>
> ---
>  lib/librte_pmd_i40e/i40e_ethdev.c | 89
> +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 89 insertions(+)
> 
> v2 changes:
> * Added a compile error fix.
> 
> v3 changes:
> * Used PRIx32 and PRIx64 instead for printing uint32_t and uint64_t
>   variables.
> * Re-worded annotations, and commit logs.
> 
> diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c
> b/lib/librte_pmd_i40e/i40e_ethdev.c
> index 008d62c..624f0ce 100644
> --- a/lib/librte_pmd_i40e/i40e_ethdev.c
> +++ b/lib/librte_pmd_i40e/i40e_ethdev.c
> @@ -198,6 +198,7 @@ static int i40e_dev_filter_ctrl(struct rte_eth_dev *dev,
>  				enum rte_filter_type filter_type,
>  				enum rte_filter_op filter_op,
>  				void *arg);
> +static void i40e_configure_registers(struct i40e_hw *hw);
> 
>  /* Default hash key buffer for RSS */
>  static uint32_t rss_key_default[I40E_PFQF_HKEY_MAX_INDEX + 1]; @@ -
> 443,6 +444,16 @@ eth_i40e_dev_init(__rte_unused struct eth_driver
> *eth_drv,
>  	/* Clear PXE mode */
>  	i40e_clear_pxe_mode(hw);
> 
> +	/*
> +	 * On X710, performance number is far from the expectation on
> recent
> +	 * firmware versions. The fix for this issue may not be integrated in
> +	 * the following firmware version. So the workaround in software
> driver
> +	 * is needed. It needs to modify the initial values of 3 internal only
> +	 * registers. Note that the workaround can be removed when it is
> fixed
> +	 * in firmware in the future.
> +	 */
> +	i40e_configure_registers(hw);
> +
>  	/* Get hw capabilities */
>  	ret = i40e_get_cap(hw);
>  	if (ret != I40E_SUCCESS) {
> @@ -5294,3 +5305,81 @@ i40e_pctype_to_flowtype(enum
> i40e_filter_pctype pctype)
> 
>  	return flowtype_table[pctype];
>  }
> +
> +static int
> +i40e_debug_read_register(struct i40e_hw *hw, uint32_t addr, uint64_t
> +*val) {
> +	struct i40e_aq_desc desc;
> +	struct i40e_aqc_debug_reg_read_write *cmd =
> +		(struct i40e_aqc_debug_reg_read_write
> *)&desc.params.raw;
> +	enum i40e_status_code status;
> +
> +	i40e_fill_default_direct_cmd_desc(&desc,
> i40e_aqc_opc_debug_read_reg);
> +	cmd->address = rte_cpu_to_le_32(addr);
> +	status = i40e_asq_send_command(hw, &desc, NULL, 0, NULL);
> +	if (status < 0)
> +		return status;
> +
> +	*val = ((uint64_t)(rte_le_to_cpu_32(cmd->value_high)) <<
> (CHAR_BIT *
> +			sizeof(uint32_t))) + rte_le_to_cpu_32(cmd-
> >value_low);
> +

Do we need to add rte_le_to_cpu_64 here?

> +	return status;
> +}
> +
> +/*
> + * On X710, performance number is far from the expectation on recent
> +firmware
> + * versions. The fix for this issue may not be integrated in the
> +following
> + * firmware version. So the workaround in software driver is needed. It
> +needs
> + * to modify the initial values of 3 internal only registers. Note that
> +the
> + * workaround can be removed when it is fixed in firmware in the future.
> + */
> +static void
> +i40e_configure_registers(struct i40e_hw *hw) {
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0       0x26CE00
> +#define I40E_GL_SWR_PRI_JOIN_MAP_2       0x26CE08
> +#define I40E_GL_SWR_PM_UP_THR            0x269FBC
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE 0x10000200 #define
> +I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE 0x011f0200
> +#define I40E_GL_SWR_PM_UP_THR_VALUE      0x03030303
> +
> +	static const struct {
> +		uint32_t addr;
> +		uint64_t val;
> +	} reg_table[] = {
> +		{I40E_GL_SWR_PRI_JOIN_MAP_0,
> I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE},
> +		{I40E_GL_SWR_PRI_JOIN_MAP_2,
> I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE},
> +		{I40E_GL_SWR_PM_UP_THR,
> I40E_GL_SWR_PM_UP_THR_VALUE},
> +	};
> +	uint64_t reg;
> +	uint32_t i;
> +	int ret;
> +
> +	/* Below fix is for X710 only */
> +	if (i40e_is_40G_device(hw->device_id))
> +		return;
> +
> +	for (i = 0; i < RTE_DIM(reg_table); i++) {
> +		ret = i40e_debug_read_register(hw, reg_table[i].addr, &reg);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to read from
> 0x%"PRIx32,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Read from 0x%"PRIx32":
> 0x%"PRIx64,
> +						reg_table[i].addr, reg);
> +		if (reg == reg_table[i].val)
> +			continue;
> +
> +		ret = i40e_aq_debug_write_register(hw, reg_table[i].addr,
> +						reg_table[i].val, NULL);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to write 0x%"PRIx64" to
> the "
> +				"address of 0x%"PRIx32, reg_table[i].val,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Write 0x%"PRIx64" to the address
> of "
> +			"0x%"PRIx32, reg_table[i].val, reg_table[i].addr);
> +	}
> +}
> --
> 1.8.1.4
  

> -----Original Message-----
> From: Wu, Jingjing
> Sent: Thursday, January 8, 2015 10:44 AM
> To: Zhang, Helin; dev@dpdk.org
> Cc: Chen, Jing D; Liu, Jijiang; Cao, Waterman; Lu, Patrick; Rowden, Aaron F
> Subject: RE: [PATCH v3] i40e: workaround for X710 performance issues
> 
> 
> 
> > -----Original Message-----
> > From: Zhang, Helin
> > Sent: Tuesday, December 16, 2014 4:23 PM
> > To: dev@dpdk.org
> > Cc: Chen, Jing D; Wu, Jingjing; Liu, Jijiang; Cao, Waterman; Lu,
> > Patrick; Rowden, Aaron F; Zhang, Helin
> > Subject: [PATCH v3] i40e: workaround for X710 performance issues
> >
> > On X710, performance number is far from the expectation on recent
> > firmware versions. The fix for this issue may not be integrated in the
> > following firmware version. So the workaround in software driver is needed.
> > It needs to modify the initial values of 3 internal only registers.
> > Note that the workaround can be removed when it is fixed in firmware in the
> future.
> >
> > Signed-off-by: Helin Zhang <helin.zhang@intel.com>
> > ---
> >  lib/librte_pmd_i40e/i40e_ethdev.c | 89
> > +++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 89 insertions(+)
> >
> > v2 changes:
> > * Added a compile error fix.
> >
> > v3 changes:
> > * Used PRIx32 and PRIx64 instead for printing uint32_t and uint64_t
> >   variables.
> > * Re-worded annotations, and commit logs.
> >
> > diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c
> > b/lib/librte_pmd_i40e/i40e_ethdev.c
> > index 008d62c..624f0ce 100644
> > --- a/lib/librte_pmd_i40e/i40e_ethdev.c
> > +++ b/lib/librte_pmd_i40e/i40e_ethdev.c
> > @@ -198,6 +198,7 @@ static int i40e_dev_filter_ctrl(struct rte_eth_dev
> *dev,
> >  				enum rte_filter_type filter_type,
> >  				enum rte_filter_op filter_op,
> >  				void *arg);
> > +static void i40e_configure_registers(struct i40e_hw *hw);
> >
> >  /* Default hash key buffer for RSS */  static uint32_t
> > rss_key_default[I40E_PFQF_HKEY_MAX_INDEX + 1]; @@ -
> > 443,6 +444,16 @@ eth_i40e_dev_init(__rte_unused struct eth_driver
> > *eth_drv,
> >  	/* Clear PXE mode */
> >  	i40e_clear_pxe_mode(hw);
> >
> > +	/*
> > +	 * On X710, performance number is far from the expectation on
> > recent
> > +	 * firmware versions. The fix for this issue may not be integrated in
> > +	 * the following firmware version. So the workaround in software
> > driver
> > +	 * is needed. It needs to modify the initial values of 3 internal only
> > +	 * registers. Note that the workaround can be removed when it is
> > fixed
> > +	 * in firmware in the future.
> > +	 */
> > +	i40e_configure_registers(hw);
> > +
> >  	/* Get hw capabilities */
> >  	ret = i40e_get_cap(hw);
> >  	if (ret != I40E_SUCCESS) {
> > @@ -5294,3 +5305,81 @@ i40e_pctype_to_flowtype(enum
> i40e_filter_pctype
> > pctype)
> >
> >  	return flowtype_table[pctype];
> >  }
> > +
> > +static int
> > +i40e_debug_read_register(struct i40e_hw *hw, uint32_t addr, uint64_t
> > +*val) {
> > +	struct i40e_aq_desc desc;
> > +	struct i40e_aqc_debug_reg_read_write *cmd =
> > +		(struct i40e_aqc_debug_reg_read_write
> > *)&desc.params.raw;
> > +	enum i40e_status_code status;
> > +
> > +	i40e_fill_default_direct_cmd_desc(&desc,
> > i40e_aqc_opc_debug_read_reg);
> > +	cmd->address = rte_cpu_to_le_32(addr);
> > +	status = i40e_asq_send_command(hw, &desc, NULL, 0, NULL);
> > +	if (status < 0)
> > +		return status;
> > +
> > +	*val = ((uint64_t)(rte_le_to_cpu_32(cmd->value_high)) <<
> > (CHAR_BIT *
> > +			sizeof(uint32_t))) + rte_le_to_cpu_32(cmd-
> > >value_low);
> > +
> 
> Do we need to add rte_le_to_cpu_64 here?
No, we don't need one more conversion, as 32 bits value are already 'cpu' byte order.

Thanks,
Helin

> 
> > +	return status;
> > +}
> > +
> > +/*
> > + * On X710, performance number is far from the expectation on recent
> > +firmware
> > + * versions. The fix for this issue may not be integrated in the
> > +following
> > + * firmware version. So the workaround in software driver is needed.
> > +It needs
> > + * to modify the initial values of 3 internal only registers. Note
> > +that the
> > + * workaround can be removed when it is fixed in firmware in the future.
> > + */
> > +static void
> > +i40e_configure_registers(struct i40e_hw *hw) {
> > +#define I40E_GL_SWR_PRI_JOIN_MAP_0       0x26CE00
> > +#define I40E_GL_SWR_PRI_JOIN_MAP_2       0x26CE08
> > +#define I40E_GL_SWR_PM_UP_THR            0x269FBC
> > +#define I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE 0x10000200 #define
> > +I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE 0x011f0200
> > +#define I40E_GL_SWR_PM_UP_THR_VALUE      0x03030303
> > +
> > +	static const struct {
> > +		uint32_t addr;
> > +		uint64_t val;
> > +	} reg_table[] = {
> > +		{I40E_GL_SWR_PRI_JOIN_MAP_0,
> > I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE},
> > +		{I40E_GL_SWR_PRI_JOIN_MAP_2,
> > I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE},
> > +		{I40E_GL_SWR_PM_UP_THR,
> > I40E_GL_SWR_PM_UP_THR_VALUE},
> > +	};
> > +	uint64_t reg;
> > +	uint32_t i;
> > +	int ret;
> > +
> > +	/* Below fix is for X710 only */
> > +	if (i40e_is_40G_device(hw->device_id))
> > +		return;
> > +
> > +	for (i = 0; i < RTE_DIM(reg_table); i++) {
> > +		ret = i40e_debug_read_register(hw, reg_table[i].addr, &reg);
> > +		if (ret < 0) {
> > +			PMD_DRV_LOG(ERR, "Failed to read from
> > 0x%"PRIx32,
> > +							reg_table[i].addr);
> > +			break;
> > +		}
> > +		PMD_DRV_LOG(DEBUG, "Read from 0x%"PRIx32":
> > 0x%"PRIx64,
> > +						reg_table[i].addr, reg);
> > +		if (reg == reg_table[i].val)
> > +			continue;
> > +
> > +		ret = i40e_aq_debug_write_register(hw, reg_table[i].addr,
> > +						reg_table[i].val, NULL);
> > +		if (ret < 0) {
> > +			PMD_DRV_LOG(ERR, "Failed to write 0x%"PRIx64" to
> > the "
> > +				"address of 0x%"PRIx32, reg_table[i].val,
> > +							reg_table[i].addr);
> > +			break;
> > +		}
> > +		PMD_DRV_LOG(DEBUG, "Write 0x%"PRIx64" to the address
> > of "
> > +			"0x%"PRIx32, reg_table[i].val, reg_table[i].addr);
> > +	}
> > +}
> > --
> > 1.8.1.4
  

> -----Original Message-----
> From: Zhang, Helin
> Sent: Tuesday, December 16, 2014 4:23 PM
> To: dev@dpdk.org
> Cc: Chen, Jing D; Wu, Jingjing; Liu, Jijiang; Cao, Waterman; Lu, Patrick;
> Rowden, Aaron F; Zhang, Helin
> Subject: [PATCH v3] i40e: workaround for X710 performance issues
> 
> On X710, performance number is far from the expectation on recent
> firmware versions. The fix for this issue may not be integrated in the
> following firmware version. So the workaround in software driver is needed.
> It needs to modify the initial values of 3 internal only registers. Note that the
> workaround can be removed when it is fixed in firmware in the future.
> 
> Signed-off-by: Helin Zhang <helin.zhang@intel.com>
> ---
>  lib/librte_pmd_i40e/i40e_ethdev.c | 89
> +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 89 insertions(+)
> 
> v2 changes:
> * Added a compile error fix.
> 
> v3 changes:
> * Used PRIx32 and PRIx64 instead for printing uint32_t and uint64_t
>   variables.
> * Re-worded annotations, and commit logs.
> 
> diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c
> b/lib/librte_pmd_i40e/i40e_ethdev.c
> index 008d62c..624f0ce 100644
> --- a/lib/librte_pmd_i40e/i40e_ethdev.c
> +++ b/lib/librte_pmd_i40e/i40e_ethdev.c
> @@ -198,6 +198,7 @@ static int i40e_dev_filter_ctrl(struct rte_eth_dev *dev,
>  				enum rte_filter_type filter_type,
>  				enum rte_filter_op filter_op,
>  				void *arg);
> +static void i40e_configure_registers(struct i40e_hw *hw);
> 
>  /* Default hash key buffer for RSS */
>  static uint32_t rss_key_default[I40E_PFQF_HKEY_MAX_INDEX + 1]; @@ -
> 443,6 +444,16 @@ eth_i40e_dev_init(__rte_unused struct eth_driver
> *eth_drv,
>  	/* Clear PXE mode */
>  	i40e_clear_pxe_mode(hw);
> 
> +	/*
> +	 * On X710, performance number is far from the expectation on
> recent
> +	 * firmware versions. The fix for this issue may not be integrated in
> +	 * the following firmware version. So the workaround in software
> driver
> +	 * is needed. It needs to modify the initial values of 3 internal only
> +	 * registers. Note that the workaround can be removed when it is
> fixed
> +	 * in firmware in the future.
> +	 */
> +	i40e_configure_registers(hw);
> +
>  	/* Get hw capabilities */
>  	ret = i40e_get_cap(hw);
>  	if (ret != I40E_SUCCESS) {
> @@ -5294,3 +5305,81 @@ i40e_pctype_to_flowtype(enum
> i40e_filter_pctype pctype)
> 
>  	return flowtype_table[pctype];
>  }
> +
> +static int
> +i40e_debug_read_register(struct i40e_hw *hw, uint32_t addr, uint64_t
> +*val) {
> +	struct i40e_aq_desc desc;
> +	struct i40e_aqc_debug_reg_read_write *cmd =
> +		(struct i40e_aqc_debug_reg_read_write
> *)&desc.params.raw;
> +	enum i40e_status_code status;
> +
> +	i40e_fill_default_direct_cmd_desc(&desc,
> i40e_aqc_opc_debug_read_reg);
> +	cmd->address = rte_cpu_to_le_32(addr);
> +	status = i40e_asq_send_command(hw, &desc, NULL, 0, NULL);
> +	if (status < 0)
> +		return status;
> +
> +	*val = ((uint64_t)(rte_le_to_cpu_32(cmd->value_high)) <<
> (CHAR_BIT *
> +			sizeof(uint32_t))) + rte_le_to_cpu_32(cmd-
> >value_low);
> +
> +	return status;
> +}
> +
> +/*
> + * On X710, performance number is far from the expectation on recent
> +firmware
> + * versions. The fix for this issue may not be integrated in the
> +following
> + * firmware version. So the workaround in software driver is needed. It
> +needs
> + * to modify the initial values of 3 internal only registers. Note that
> +the
> + * workaround can be removed when it is fixed in firmware in the future.
> + */
> +static void
> +i40e_configure_registers(struct i40e_hw *hw) {
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0       0x26CE00
> +#define I40E_GL_SWR_PRI_JOIN_MAP_2       0x26CE08
> +#define I40E_GL_SWR_PM_UP_THR            0x269FBC
> +#define I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE 0x10000200 #define
> +I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE 0x011f0200
> +#define I40E_GL_SWR_PM_UP_THR_VALUE      0x03030303
> +
> +	static const struct {
> +		uint32_t addr;
> +		uint64_t val;
> +	} reg_table[] = {
> +		{I40E_GL_SWR_PRI_JOIN_MAP_0,
> I40E_GL_SWR_PRI_JOIN_MAP_0_VALUE},
> +		{I40E_GL_SWR_PRI_JOIN_MAP_2,
> I40E_GL_SWR_PRI_JOIN_MAP_2_VALUE},
> +		{I40E_GL_SWR_PM_UP_THR,
> I40E_GL_SWR_PM_UP_THR_VALUE},
> +	};
> +	uint64_t reg;
> +	uint32_t i;
> +	int ret;
> +
> +	/* Below fix is for X710 only */
> +	if (i40e_is_40G_device(hw->device_id))
> +		return;
> +
> +	for (i = 0; i < RTE_DIM(reg_table); i++) {
> +		ret = i40e_debug_read_register(hw, reg_table[i].addr, &reg);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to read from
> 0x%"PRIx32,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Read from 0x%"PRIx32":
> 0x%"PRIx64,
> +						reg_table[i].addr, reg);
> +		if (reg == reg_table[i].val)
> +			continue;
> +
> +		ret = i40e_aq_debug_write_register(hw, reg_table[i].addr,
> +						reg_table[i].val, NULL);
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to write 0x%"PRIx64" to
> the "
> +				"address of 0x%"PRIx32, reg_table[i].val,
> +							reg_table[i].addr);
> +			break;
> +		}
> +		PMD_DRV_LOG(DEBUG, "Write 0x%"PRIx64" to the address
> of "
> +			"0x%"PRIx32, reg_table[i].val, reg_table[i].addr);
> +	}
> +}
> --
> 1.8.1.4

Acked-by: Jingjing Wu <jingjing.wu@intel.com>
  

2015-01-09 05:29, Wu, Jingjing:
> Acked-by: Jingjing Wu <jingjing.wu@intel.com>

Jingjing, this patch is already applied in version 1.8.0:
	http://dpdk.org/ml/archives/dev/2014-December/010164.html
  

Hi Thomas, Jingjing

I guess Jingjing intended to ack another patch, which is for XL710 performance enhancement. Thanks for the good catch!

Regards,
Helin

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Friday, January 9, 2015 11:48 PM
> To: Wu, Jingjing
> Cc: dev@dpdk.org; Zhang, Helin; Rowden, Aaron F
> Subject: Re: [dpdk-dev] [PATCH v3] i40e: workaround for X710 performance
> issues
> 
> 2015-01-09 05:29, Wu, Jingjing:
> > Acked-by: Jingjing Wu <jingjing.wu@intel.com>
> 
> Jingjing, this patch is already applied in version 1.8.0:
> 	http://dpdk.org/ml/archives/dev/2014-December/010164.html
> 
> --
> Thomas
  

Thanks, Thomas.

I supposed to review another patch for XL710 performance. Due to the similar patch subject, I reviewed this applied patch.

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Friday, January 09, 2015 11:48 PM
> To: Wu, Jingjing
> Cc: dev@dpdk.org; Zhang, Helin; Rowden, Aaron F
> Subject: Re: [dpdk-dev] [PATCH v3] i40e: workaround for X710 performance
> issues
> 
> 2015-01-09 05:29, Wu, Jingjing:
> > Acked-by: Jingjing Wu <jingjing.wu@intel.com>
> 
> Jingjing, this patch is already applied in version 1.8.0:
> 	http://dpdk.org/ml/archives/dev/2014-December/010164.html
> 
> --
> Thomas