[Intel-wired-lan] [iwl-next v3 1/8] ice: devlink PF MSI-X max and min parameter

Jiri Pirko jiri at resnulli.us
Fri Aug 9 10:51:58 UTC 2024


Fri, Aug 09, 2024 at 07:13:34AM CEST, michal.swiatkowski at linux.intel.com wrote:
>On Thu, Aug 08, 2024 at 05:34:35PM +0200, Jiri Pirko wrote:
>> Thu, Aug 08, 2024 at 09:20:09AM CEST, michal.swiatkowski at linux.intel.com wrote:
>> >Use generic devlink PF MSI-X parameter to allow user to change MSI-X
>> >range.
>> >
>> >Reviewed-by: Wojciech Drewek <wojciech.drewek at intel.com>
>> >Signed-off-by: Michal Swiatkowski <michal.swiatkowski at linux.intel.com>
>> >---
>> > .../net/ethernet/intel/ice/devlink/devlink.c  | 56 ++++++++++++++++++-
>> > drivers/net/ethernet/intel/ice/ice.h          |  8 +++
>> > drivers/net/ethernet/intel/ice/ice_irq.c      | 14 ++++-
>> > 3 files changed, 76 insertions(+), 2 deletions(-)
>> >
>> >diff --git a/drivers/net/ethernet/intel/ice/devlink/devlink.c b/drivers/net/ethernet/intel/ice/devlink/devlink.c
>> >index 29a5f822cb8b..bdc22ea13e0f 100644
>> >--- a/drivers/net/ethernet/intel/ice/devlink/devlink.c
>> >+++ b/drivers/net/ethernet/intel/ice/devlink/devlink.c
>> >@@ -1518,6 +1518,32 @@ 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)
>> >+{
>> >+	if (val.vu16 > ICE_MAX_MSIX) {
>> >+		NL_SET_ERR_MSG_MOD(extack, "PF max MSI-X is too high");
>> 
>> No reason to have "PF" in the text. Also, no reason to have "max MSI-X".
>> That is the name of the param.
>> 
>
>Ok, will change both, thanks.
>
>> 
>> 
>> >+		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)
>> >+{
>> >+	if (val.vu16 <= ICE_MIN_MSIX) {
>> >+		NL_SET_ERR_MSG_MOD(extack, "PF min MSI-X is too low");
>> 
>> Same comment as for max goes here.
>> 
>> 
>> >+		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,
>> >@@ -1535,6 +1561,15 @@ 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",
>> >@@ -1637,6 +1672,7 @@ 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;
>> > 
>> >@@ -1645,11 +1681,27 @@ 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;
>> > }
>> > 
>> > void ice_devlink_unregister_params(struct ice_pf *pf)
>> >@@ -1659,6 +1711,8 @@ void ice_devlink_unregister_params(struct ice_pf *pf)
>> > 
>> > 	devl_params_unregister(devlink, ice_dvl_rdma_params,
>> > 			       ARRAY_SIZE(ice_dvl_rdma_params));
>> >+	devl_params_unregister(devlink, ice_dvl_msix_params,
>> >+			       ARRAY_SIZE(ice_dvl_msix_params));
>> > 
>> > 	if (hw->func_caps.common_cap.tx_sched_topo_comp_mode_en)
>> > 		devl_params_unregister(devlink, ice_dvl_sched_params,
>> >diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
>> >index d6f80da30dec..a67456057c77 100644
>> >--- a/drivers/net/ethernet/intel/ice/ice.h
>> >+++ b/drivers/net/ethernet/intel/ice/ice.h
>> >@@ -95,6 +95,7 @@
>> > #define ICE_MIN_LAN_TXRX_MSIX	1
>> > #define ICE_MIN_LAN_OICR_MSIX	1
>> > #define ICE_MIN_MSIX		(ICE_MIN_LAN_TXRX_MSIX + ICE_MIN_LAN_OICR_MSIX)
>> >+#define ICE_MAX_MSIX		256
>> > #define ICE_FDIR_MSIX		2
>> > #define ICE_RDMA_NUM_AEQ_MSIX	4
>> > #define ICE_MIN_RDMA_MSIX	2
>> >@@ -545,6 +546,12 @@ struct ice_agg_node {
>> > 	u8 valid;
>> > };
>> > 
>> >+struct ice_pf_msix {
>> >+	u16 cur;
>> >+	u16 min;
>> >+	u16 max;
>> >+};
>> >+
>> > struct ice_pf {
>> > 	struct pci_dev *pdev;
>> > 	struct ice_adapter *adapter;
>> >@@ -615,6 +622,7 @@ struct ice_pf {
>> > 	struct msi_map ll_ts_irq;	/* LL_TS interrupt MSIX vector */
>> > 	u16 max_pf_txqs;	/* Total Tx queues PF wide */
>> > 	u16 max_pf_rxqs;	/* Total Rx queues PF wide */
>> >+	struct ice_pf_msix msix;
>> > 	u16 num_lan_msix;	/* Total MSIX vectors for base driver */
>> > 	u16 num_lan_tx;		/* num LAN Tx queues setup */
>> > 	u16 num_lan_rx;		/* num LAN Rx queues setup */
>> >diff --git a/drivers/net/ethernet/intel/ice/ice_irq.c b/drivers/net/ethernet/intel/ice/ice_irq.c
>> >index ad82ff7d1995..4e559fd6e49f 100644
>> >--- a/drivers/net/ethernet/intel/ice/ice_irq.c
>> >+++ b/drivers/net/ethernet/intel/ice/ice_irq.c
>> >@@ -252,7 +252,19 @@ void ice_clear_interrupt_scheme(struct ice_pf *pf)
>> > int ice_init_interrupt_scheme(struct ice_pf *pf)
>> > {
>> > 	int total_vectors = pf->hw.func_caps.common_cap.num_msix_vectors;
>> >-	int vectors, max_vectors;
>> >+	union devlink_param_value value;
>> >+	int vectors, max_vectors, err;
>> >+
>> >+	/* load default PF MSI-X range */
>> >+	err = devl_param_driverinit_value_get(priv_to_devlink(pf),
>> >+					      DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
>> >+					      &value);
>> 
>> If err is not 0, you have a bug in the driver. Perhaps it a about the
>> time to make this return void and add some WARN_ONs inside the function?
>> 
>
>err is not 0 when this param isn't found (not registered yet). It is a
>case when driver is probing, I want to have here default values and
>register it later. Instead of checking if it is probe context or reload
>context I am checking if param already exists. The param doesn't exist in
>probe, but exists in reload.

No, you have to make sure that you are using these values after they are
set. Please fix.


>
>> 
>> >+	pf->msix.min = err ? ICE_MIN_MSIX : value.vu16;
>> >+
>> >+	err = devl_param_driverinit_value_get(priv_to_devlink(pf),
>> >+					      DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
>> >+					      &value);
>> >+	pf->msix.max = err ? total_vectors / 2 : value.vu16;
>> > 
>> > 	vectors = ice_ena_msix_range(pf);
>> > 
>> >-- 
>> >2.42.0
>> >


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