Date: Tue, 4 Jun 2024 05:56:38 +0000
From: Hariprasad Kelam <hkelam@...vell.com>
To: Wojciech Drewek <wojciech.drewek@...el.com>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
CC: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "jacob.e.keller@...el.com"
	<jacob.e.keller@...el.com>
Subject: [PATCH iwl-next v3] ice: Add support for devlink local_forwarding
 param.



> From: Pawel Kaminski <pawel.kaminski@...el.com>
> 
> Add support for driver-specific devlink local_forwarding param.
> Supported values are "enabled", "disabled" and "prioritized".
> Default configuration is set to "enabled".
> 
> Add documentation in networking/devlink/ice.rst.
> 
> In previous generations of Intel NICs the transmit scheduler was only limited
> by PCIe bandwidth when scheduling/assigning hairpin-badwidth between
> VFs. Changes to E810 HW design introduced scheduler limitation, so that
> available hairpin-bandwidth is bound to external port speed.
> In order to address this limitation and enable NFV services such as "service
> chaining" a knob to adjust the scheduler config was created.
> Driver can send a configuration message to the FW over admin queue and
> internal FW logic will reconfigure HW to prioritize and add more BW to VF to
> VF traffic. As end result for example 10G port will no longer limit hairpin-
> badwith to 10G and much higher speeds can be achieved.
> 
> Devlink local_forwarding param set to "prioritized" enables higher hairpin-
> badwitdh on related PFs. Configuration is applicable only to 8x10G and 4x25G
> cards.
> 
> Changing local_forwarding configuration will trigger CORER reset in order to
> take effect.
> 
> Example command to change current value:
> devlink dev param set pci/0000:b2:00.3 name local_forwarding \
>         value prioritized \
>         cmode runtime
> 
> Co-developed-by: Michal Wilczynski <michal.wilczynski@...el.com>
> Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Pawel Kaminski <pawel.kaminski@...el.com>
> Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
> ---
> v2: Extend documentation
> v3: rename loopback to local_forwarding
> ---
>  Documentation/networking/devlink/ice.rst      |  23 ++++
>  .../net/ethernet/intel/ice/devlink/devlink.c  | 126 ++++++++++++++++++
>  .../net/ethernet/intel/ice/ice_adminq_cmd.h   |  11 +-
>  drivers/net/ethernet/intel/ice/ice_common.c   |   4 +
>  drivers/net/ethernet/intel/ice/ice_type.h     |   1 +
>  5 files changed, 164 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/networking/devlink/ice.rst
> b/Documentation/networking/devlink/ice.rst
> index 830c04354222..0eb64bd4710f 100644
> --- a/Documentation/networking/devlink/ice.rst
> +++ b/Documentation/networking/devlink/ice.rst
> @@ -11,6 +11,7 @@ Parameters
>  ==========
> 
>  .. list-table:: Generic parameters implemented
> +   :widths: 5 5 90
> 
>     * - Name
>       - Mode
> @@ -68,6 +69,28 @@ Parameters
> 
>         To verify that value has been set:
>         $ devlink dev param show pci/0000:16:00.0 name tx_scheduling_layers
> +.. list-table:: Driver specific parameters implemented
> +    :widths: 5 5 90
> +
> +    * - Name
> +      - Mode
> +      - Description
> +    * - ``local_forwarding``
> +      - runtime
> +      - Controls loopback behavior by tuning scheduler bandwidth.
> +        Supported values are:
> +
> +        ``enabled`` - VF to VF traffic is allowed on port
> +
> +        ``disabled`` - VF to VF traffic is not allowed on this port
> +
> +        ``prioritized`` - VF to VF traffic is prioritized on this port
> +
> +        Default value of ``local_forwarding`` parameter is ``enabled``.
> +        ``prioritized`` provides ability to adjust VF to VF traffic rate to increase
> +        one port capacity at cost of the another. User needs to disable
> +        local forwarding on one of the ports in order have increased capacity
> +        on the ``prioritized`` port.
> 
>  Info versions
>  =============
> diff --git a/drivers/net/ethernet/intel/ice/devlink/devlink.c
> b/drivers/net/ethernet/intel/ice/devlink/devlink.c
> index f774781ab514..810a901d7afd 100644
> --- a/drivers/net/ethernet/intel/ice/devlink/devlink.c
> +++ b/drivers/net/ethernet/intel/ice/devlink/devlink.c
> @@ -1381,9 +1381,129 @@ ice_devlink_enable_iw_validate(struct devlink
> *devlink, u32 id,
>  	return 0;
>  }
> 
> +#define DEVLINK_LOCAL_FWD_DISABLED_STR "disabled"
> +#define DEVLINK_LOCAL_FWD_ENABLED_STR "enabled"
> +#define DEVLINK_LOCAL_FWD_PRIORITIZED_STR "prioritized"
> +
> +/**
> + * ice_devlink_local_fwd_mode_to_str - Get string for local_fwd mode.
> + * @mode: local forwarding for mode used in port_info struct.
> + *
> + * Return: Mode respective string or "Invalid".
> + */
> +static const char *
> +ice_devlink_local_fwd_mode_to_str(enum ice_local_fwd_mode mode) {
> +	switch (mode) {
> +	case ICE_LOCAL_FWD_MODE_ENABLED:
> +		return DEVLINK_LOCAL_FWD_ENABLED_STR;
> +	case ICE_LOCAL_FWD_MODE_PRIORITIZED:
> +		return DEVLINK_LOCAL_FWD_PRIORITIZED_STR;
> +	case ICE_LOCAL_FWD_MODE_DISABLED:
> +		return DEVLINK_LOCAL_FWD_DISABLED_STR;
> +	}
> +
> +	return "Invalid";
> +}
> +
> +/**
> + * ice_devlink_local_fwd_str_to_mode - Get local_fwd mode from string
> name.
> + * @mode_str: local forwarding mode string.
> + *
> + * Return: Mode value or negative number if invalid.
> + */
> +static int ice_devlink_local_fwd_str_to_mode(const char *mode_str) {
> +	if (!strcmp(mode_str, DEVLINK_LOCAL_FWD_ENABLED_STR))
> +		return ICE_LOCAL_FWD_MODE_ENABLED;
> +	else if (!strcmp(mode_str, DEVLINK_LOCAL_FWD_PRIORITIZED_STR))
> +		return ICE_LOCAL_FWD_MODE_PRIORITIZED;
> +	else if (!strcmp(mode_str, DEVLINK_LOCAL_FWD_DISABLED_STR))
> +		return ICE_LOCAL_FWD_MODE_DISABLED;
> +
> +	return -EINVAL;
> +}
> +
> +/**
> + * ice_devlink_local_fwd_get - Get local_fwd parameter.
> + * @devlink: Pointer to the devlink instance.
> + * @id: The parameter ID to set.
> + * @ctx: Context to store the parameter value.
> + *
> + * Return: Zero.
> + */
> +static int ice_devlink_local_fwd_get(struct devlink *devlink, u32 id,
> +				     struct devlink_param_gset_ctx *ctx) {
> +	struct ice_pf *pf = devlink_priv(devlink);
> +	struct ice_port_info *pi;
> +	const char *mode_str;
> +
> +	pi = pf->hw.port_info;
> +	mode_str = ice_devlink_local_fwd_mode_to_str(pi-
> >local_fwd_mode);
> +	snprintf(ctx->val.vstr, sizeof(ctx->val.vstr), "%s", mode_str);
> +
> +	return 0;
> +}
> +
> +/**
> + * ice_devlink_local_fwd_set - Set local_fwd parameter.
> + * @devlink: Pointer to the devlink instance.
> + * @id: The parameter ID to set.
> + * @ctx: Context to get the parameter value.
> + * @extack: Netlink extended ACK structure.
> + *
> + * Return: Zero.
> + */
> +static int ice_devlink_local_fwd_set(struct devlink *devlink, u32 id,
> +				     struct devlink_param_gset_ctx *ctx,
> +				     struct netlink_ext_ack *extack) {
> +	int new_local_fwd_mode = ice_devlink_local_fwd_str_to_mode(ctx-
> >val.vstr);
> +	struct ice_pf *pf = devlink_priv(devlink);
> +	struct device *dev = ice_pf_to_dev(pf);
> +	struct ice_port_info *pi;
> +
> +	pi = pf->hw.port_info;
> +	if (pi->local_fwd_mode != new_local_fwd_mode) {
          This check seems redundant, as devlink calls set API only if there is change in value.

Thanks,
Hariprasad k
> +		pi->local_fwd_mode = new_local_fwd_mode;
> +		dev_info(dev, "Setting local_fwd to %s\n", ctx->val.vstr);
> +		ice_schedule_reset(pf, ICE_RESET_CORER);
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * ice_devlink_local_fwd_validate - Validate passed local_fwd parameter
> value.
> + * @devlink: Unused pointer to devlink instance.
> + * @id: The parameter ID to validate.
> + * @val: Value to validate.
> + * @extack: Netlink extended ACK structure.
> + *
> + * Supported values are:
> + * "enabled" - local_fwd is enabled, "disabled" - local_fwd is disabled
> + * "prioritized" - local_fwd traffic is prioritized in scheduling.
> + *
> + * Return: Zero when passed parameter value is supported. Negative
> +value on
> + * error.
> + */
> +static int ice_devlink_local_fwd_validate(struct devlink *devlink, u32 id,
> +					  union devlink_param_value val,
> +					  struct netlink_ext_ack *extack)
> +{
> +	if (ice_devlink_local_fwd_str_to_mode(val.vstr) < 0) {
> +		NL_SET_ERR_MSG_MOD(extack, "Error: Requested value is
> not supported.");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  enum ice_param_id {
>  	ICE_DEVLINK_PARAM_ID_BASE =
> DEVLINK_PARAM_GENERIC_ID_MAX,
>  	ICE_DEVLINK_PARAM_ID_TX_SCHED_LAYERS,
> +	ICE_DEVLINK_PARAM_ID_LOCAL_FWD,
>  };
> 
>  static const struct devlink_param ice_dvl_rdma_params[] = { @@ -1405,6
> +1525,12 @@ static const struct devlink_param ice_dvl_sched_params[] = {
>  			     ice_devlink_tx_sched_layers_get,
>  			     ice_devlink_tx_sched_layers_set,
>  			     ice_devlink_tx_sched_layers_validate),
> +	DEVLINK_PARAM_DRIVER(ICE_DEVLINK_PARAM_ID_LOCAL_FWD,
> +			     "local_forwarding",
> DEVLINK_PARAM_TYPE_STRING,
> +			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
> +			     ice_devlink_local_fwd_get,
> +			     ice_devlink_local_fwd_set,
> +			     ice_devlink_local_fwd_validate),
>  };
> 
>  static void ice_devlink_free(void *devlink_ptr) diff --git
> a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> index 621a2ca7093e..9683842f8880 100644
> --- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> +++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> @@ -232,6 +232,13 @@ struct ice_aqc_get_sw_cfg_resp_elem {
>  #define ICE_AQC_GET_SW_CONF_RESP_IS_VF		BIT(15)
>  };
> 
> +/* Loopback port parameter mode values. */ enum ice_local_fwd_mode {
> +	ICE_LOCAL_FWD_MODE_ENABLED = 0,
> +	ICE_LOCAL_FWD_MODE_DISABLED = 1,
> +	ICE_LOCAL_FWD_MODE_PRIORITIZED = 2,
> +};
> +
>  /* Set Port parameters, (direct, 0x0203) */  struct ice_aqc_set_port_params {
>  	__le16 cmd_flags;
> @@ -240,7 +247,9 @@ struct ice_aqc_set_port_params {
>  	__le16 swid;
>  #define ICE_AQC_PORT_SWID_VALID			BIT(15)
>  #define ICE_AQC_PORT_SWID_M			0xFF
> -	u8 reserved[10];
> +	u8 local_fwd_mode;
> +#define ICE_AQC_SET_P_PARAMS_LOCAL_FWD_MODE_VALID BIT(2)
> +	u8 reserved[9];
>  };
> 
>  /* These resource type defines are used for all switch resource diff --git
> a/drivers/net/ethernet/intel/ice/ice_common.c
> b/drivers/net/ethernet/intel/ice/ice_common.c
> index 9ae61cd8923e..60ad7774812c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_common.c
> +++ b/drivers/net/ethernet/intel/ice/ice_common.c
> @@ -1086,6 +1086,7 @@ int ice_init_hw(struct ice_hw *hw)
>  		goto err_unroll_cqinit;
>  	}
> 
> +	hw->port_info->local_fwd_mode =
> ICE_LOCAL_FWD_MODE_ENABLED;
>  	/* set the back pointer to HW */
>  	hw->port_info->hw = hw;
> 
> @@ -3070,6 +3071,9 @@ ice_aq_set_port_params(struct ice_port_info *pi,
> bool double_vlan,
>  		cmd_flags |= ICE_AQC_SET_P_PARAMS_DOUBLE_VLAN_ENA;
>  	cmd->cmd_flags = cpu_to_le16(cmd_flags);
> 
> +	cmd->local_fwd_mode = pi->local_fwd_mode |
> +
> 	ICE_AQC_SET_P_PARAMS_LOCAL_FWD_MODE_VALID;
> +
>  	return ice_aq_send_cmd(hw, &desc, NULL, 0, cd);  }
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_type.h
> b/drivers/net/ethernet/intel/ice/ice_type.h
> index aac59c85a911..f3e4d8030f43 100644
> --- a/drivers/net/ethernet/intel/ice/ice_type.h
> +++ b/drivers/net/ethernet/intel/ice/ice_type.h
> @@ -730,6 +730,7 @@ struct ice_port_info {
>  	u16 sw_id;			/* Initial switch ID belongs to port */
>  	u16 pf_vf_num;
>  	u8 port_state;
> +	u8 local_fwd_mode;
>  #define ICE_SCHED_PORT_STATE_INIT	0x0
>  #define ICE_SCHED_PORT_STATE_READY	0x1
>  	u8 lport;
> --
> 2.40.1
> 

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