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Message-ID: <CADEbmW0=G8u7Y8L2fFTzan8S+Uz04nAMC+-dkj-rQb_izK88pg@mail.gmail.com>
Date: Thu, 31 Oct 2024 22:48:37 +0100
From: Michal Schmidt <mschmidt@...hat.com>
To: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, 
	pawel.chmielewski@...el.com, sridhar.samudrala@...el.com, 
	jacob.e.keller@...el.com, pio.raczynski@...il.com, konrad.knitter@...el.com, 
	marcin.szycik@...el.com, wojciech.drewek@...el.com, 
	nex.sw.ncis.nat.hpm.dev@...el.com, przemyslaw.kitszel@...el.com, 
	jiri@...nulli.us, horms@...nel.org, David.Laight@...lab.com
Subject: Re: [Intel-wired-lan] [iwl-next v6 2/9] ice: devlink PF MSI-X max and
 min parameter

On Mon, Oct 28, 2024 at 11:04 AM Michal Swiatkowski
<michal.swiatkowski@...ux.intel.com> wrote:
>
> Use generic devlink PF MSI-X parameter to allow user to change MSI-X
> range.
>
> Add notes about this parameters into ice devlink documentation.
>
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
> Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> ---
>  Documentation/networking/devlink/ice.rst      | 11 +++
>  .../net/ethernet/intel/ice/devlink/devlink.c  | 83 ++++++++++++++++++-
>  drivers/net/ethernet/intel/ice/ice.h          |  7 ++
>  drivers/net/ethernet/intel/ice/ice_irq.c      |  7 ++
>  4 files changed, 107 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/networking/devlink/ice.rst b/Documentation/networking/devlink/ice.rst
> index e3972d03cea0..792e9f8c846a 100644
> --- a/Documentation/networking/devlink/ice.rst
> +++ b/Documentation/networking/devlink/ice.rst
> @@ -69,6 +69,17 @@ Parameters
>
>         To verify that value has been set:
>         $ devlink dev param show pci/0000:16:00.0 name tx_scheduling_layers
> +   * - ``msix_vec_per_pf_max``
> +     - driverinit
> +     - Set the max MSI-X that can be used by the PF, rest can be utilized for
> +       SRIOV. The range is from min value set in msix_vec_per_pf_min to
> +       2k/number of ports.
> +   * - ``msix_vec_per_pf_min``
> +     - driverinit
> +     - Set the min MSI-X that will be used by the PF. This value inform how many
> +       MSI-X will be allocated statically. The range is from 2 to value set
> +       in msix_vec_per_pf_max.
> +
>  .. list-table:: Driver specific parameters implemented
>      :widths: 5 5 90
>
> diff --git a/drivers/net/ethernet/intel/ice/devlink/devlink.c b/drivers/net/ethernet/intel/ice/devlink/devlink.c
> index d1b9ccec5e05..29c1fec4fa93 100644
> --- a/drivers/net/ethernet/intel/ice/devlink/devlink.c
> +++ b/drivers/net/ethernet/intel/ice/devlink/devlink.c
> @@ -1198,6 +1198,25 @@ static int ice_devlink_set_parent(struct devlink_rate *devlink_rate,
>         return status;
>  }
>
> +static void ice_set_min_max_msix(struct ice_pf *pf)
> +{
> +       struct devlink *devlink = priv_to_devlink(pf);
> +       union devlink_param_value val;
> +       int err;
> +
> +       err = devl_param_driverinit_value_get(devlink,
> +                                             DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
> +                                             &val);
> +       if (!err)
> +               pf->msix.min = val.vu16;
> +
> +       err = devl_param_driverinit_value_get(devlink,
> +                                             DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
> +                                             &val);
> +       if (!err)
> +               pf->msix.max = val.vu16;
> +}
> +
>  /**
>   * ice_devlink_reinit_up - do reinit of the given PF
>   * @pf: pointer to the PF struct
> @@ -1207,6 +1226,9 @@ static int ice_devlink_reinit_up(struct ice_pf *pf)
>         struct ice_vsi *vsi = ice_get_main_vsi(pf);
>         int err;
>
> +       /* load MSI-X values */
> +       ice_set_min_max_msix(pf);
> +
>         err = ice_init_hw(&pf->hw);
>         if (err) {
>                 dev_err(ice_pf_to_dev(pf), "ice_init_hw failed: %d\n", err);
> @@ -1526,6 +1548,37 @@ static int ice_devlink_local_fwd_validate(struct devlink *devlink, u32 id,
>         return 0;
>  }
>
> +static int
> +ice_devlink_msix_max_pf_validate(struct devlink *devlink, u32 id,
> +                                union devlink_param_value val,
> +                                struct netlink_ext_ack *extack)
> +{
> +       struct ice_pf *pf = devlink_priv(devlink);
> +
> +       if (val.vu16 > pf->hw.func_caps.common_cap.num_msix_vectors ||
> +           val.vu16 < pf->msix.min) {
> +               NL_SET_ERR_MSG_MOD(extack, "Value is invalid");
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int
> +ice_devlink_msix_min_pf_validate(struct devlink *devlink, u32 id,
> +                                union devlink_param_value val,
> +                                struct netlink_ext_ack *extack)
> +{
> +       struct ice_pf *pf = devlink_priv(devlink);
> +
> +       if (val.vu16 <= ICE_MIN_MSIX || val.vu16 > pf->msix.max) {
> +               NL_SET_ERR_MSG_MOD(extack, "Value is invalid");
> +               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,
> @@ -1543,6 +1596,15 @@ static const struct devlink_param ice_dvl_rdma_params[] = {
>                               ice_devlink_enable_iw_validate),
>  };
>
> +static const struct devlink_param ice_dvl_msix_params[] = {
> +       DEVLINK_PARAM_GENERIC(MSIX_VEC_PER_PF_MAX,
> +                             BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
> +                             NULL, NULL, ice_devlink_msix_max_pf_validate),
> +       DEVLINK_PARAM_GENERIC(MSIX_VEC_PER_PF_MIN,
> +                             BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
> +                             NULL, NULL, ice_devlink_msix_min_pf_validate),
> +};
> +
>  static const struct devlink_param ice_dvl_sched_params[] = {
>         DEVLINK_PARAM_DRIVER(ICE_DEVLINK_PARAM_ID_TX_SCHED_LAYERS,
>                              "tx_scheduling_layers",
> @@ -1644,6 +1706,7 @@ void ice_devlink_unregister(struct ice_pf *pf)
>  int ice_devlink_register_params(struct ice_pf *pf)
>  {
>         struct devlink *devlink = priv_to_devlink(pf);
> +       union devlink_param_value value;
>         struct ice_hw *hw = &pf->hw;
>         int status;
>
> @@ -1652,11 +1715,27 @@ int ice_devlink_register_params(struct ice_pf *pf)
>         if (status)
>                 return status;
>
> +       status = devl_params_register(devlink, ice_dvl_msix_params,
> +                                     ARRAY_SIZE(ice_dvl_msix_params));
> +       if (status)
> +               return status;
> +
>         if (hw->func_caps.common_cap.tx_sched_topo_comp_mode_en)
>                 status = devl_params_register(devlink, ice_dvl_sched_params,
>                                               ARRAY_SIZE(ice_dvl_sched_params));
> +       if (status)
> +               return status;
>
> -       return status;
> +       value.vu16 = pf->msix.max;
> +       devl_param_driverinit_value_set(devlink,
> +                                       DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
> +                                       value);
> +       value.vu16 = pf->msix.min;
> +       devl_param_driverinit_value_set(devlink,
> +                                       DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
> +                                       value);
> +
> +       return 0;
>  }


The type of the devlink parameters msix_vec_per_pf_{min,max} is
specified as u32, so you must use value.vu32 everywhere you work with
them, not vu16.

Michal


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