netdev - Re: [PATCH v6 net-next 4/8] sfc: add mport lookup based on driver's mport data

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Date:   Fri, 10 Feb 2023 08:47:29 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     alejandro.lucero-palau@....com
Cc:     netdev@...r.kernel.org, linux-net-drivers@....com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, ecree.xilinx@...il.com,
        linux-doc@...r.kernel.org, corbet@....net, jiri@...dia.com
Subject: Re: [PATCH v6 net-next 4/8] sfc: add mport lookup based on driver's
 mport data

On Wed, Feb 08, 2023 at 02:25:15PM +0000, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alejandro.lucero-palau@....com>
> 
> Obtaining mport id is based on asking the firmware about it. This is
> still needed for mport initialization itself, but once the mport data is
> now kept by the driver, further mport id request can be satisfied
> internally without firmware interaction.
> 
> Previous function is just modified in name making clear the firmware
> interaction. The new function uses the old name and looks for the data
> in the mport data structure.
> 
> Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@....com>

Acked-by: Martin Habets <habetsm.xilinx@...il.com>

> ---
>  drivers/net/ethernet/sfc/ef100_nic.c |  4 ++--
>  drivers/net/ethernet/sfc/ef100_rep.c |  5 +----
>  drivers/net/ethernet/sfc/mae.c       | 27 ++++++++++++++++++++++++++-
>  drivers/net/ethernet/sfc/mae.h       |  2 ++
>  4 files changed, 31 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
> index 07e7dca0e4f2..aa11f0925e27 100644
> --- a/drivers/net/ethernet/sfc/ef100_nic.c
> +++ b/drivers/net/ethernet/sfc/ef100_nic.c
> @@ -736,7 +736,7 @@ static int efx_ef100_get_base_mport(struct efx_nic *efx)
>  	/* Construct mport selector for "physical network port" */
>  	efx_mae_mport_wire(efx, &selector);
>  	/* Look up actual mport ID */
> -	rc = efx_mae_lookup_mport(efx, selector, &id);
> +	rc = efx_mae_fw_lookup_mport(efx, selector, &id);
>  	if (rc)
>  		return rc;
>  	/* The ID should always fit in 16 bits, because that's how wide the
> @@ -751,7 +751,7 @@ static int efx_ef100_get_base_mport(struct efx_nic *efx)
>  	/* Construct mport selector for "calling PF" */
>  	efx_mae_mport_uplink(efx, &selector);
>  	/* Look up actual mport ID */
> -	rc = efx_mae_lookup_mport(efx, selector, &id);
> +	rc = efx_mae_fw_lookup_mport(efx, selector, &id);
>  	if (rc)
>  		return rc;
>  	if (id >> 16)
> diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c
> index ebe7b1275713..9cd1a3ac67e0 100644
> --- a/drivers/net/ethernet/sfc/ef100_rep.c
> +++ b/drivers/net/ethernet/sfc/ef100_rep.c
> @@ -243,14 +243,11 @@ static struct efx_rep *efx_ef100_rep_create_netdev(struct efx_nic *efx,
>  static int efx_ef100_configure_rep(struct efx_rep *efv)
>  {
>  	struct efx_nic *efx = efv->parent;
> -	u32 selector;
>  	int rc;
>  
>  	efv->rx_pring_size = EFX_REP_DEFAULT_PSEUDO_RING_SIZE;
> -	/* Construct mport selector for corresponding VF */
> -	efx_mae_mport_vf(efx, efv->idx, &selector);
>  	/* Look up actual mport ID */
> -	rc = efx_mae_lookup_mport(efx, selector, &efv->mport);
> +	rc = efx_mae_lookup_mport(efx, efv->idx, &efv->mport);
>  	if (rc)
>  		return rc;
>  	pci_dbg(efx->pci_dev, "VF %u has mport ID %#x\n", efv->idx, efv->mport);
> diff --git a/drivers/net/ethernet/sfc/mae.c b/drivers/net/ethernet/sfc/mae.c
> index 725a3ab31087..6321fd393fc3 100644
> --- a/drivers/net/ethernet/sfc/mae.c
> +++ b/drivers/net/ethernet/sfc/mae.c
> @@ -97,7 +97,7 @@ void efx_mae_mport_mport(struct efx_nic *efx __always_unused, u32 mport_id, u32
>  }
>  
>  /* id is really only 24 bits wide */
> -int efx_mae_lookup_mport(struct efx_nic *efx, u32 selector, u32 *id)
> +int efx_mae_fw_lookup_mport(struct efx_nic *efx, u32 selector, u32 *id)
>  {
>  	MCDI_DECLARE_BUF(outbuf, MC_CMD_MAE_MPORT_LOOKUP_OUT_LEN);
>  	MCDI_DECLARE_BUF(inbuf, MC_CMD_MAE_MPORT_LOOKUP_IN_LEN);
> @@ -488,6 +488,31 @@ int efx_mae_free_counter(struct efx_nic *efx, struct efx_tc_counter *cnt)
>  	return 0;
>  }
>  
> +int efx_mae_lookup_mport(struct efx_nic *efx, u32 vf_idx, u32 *id)
> +{
> +	struct ef100_nic_data *nic_data = efx->nic_data;
> +	struct efx_mae *mae = efx->mae;
> +	struct rhashtable_iter walk;
> +	struct mae_mport_desc *m;
> +	int rc = -ENOENT;
> +
> +	rhashtable_walk_enter(&mae->mports_ht, &walk);
> +	rhashtable_walk_start(&walk);
> +	while ((m = rhashtable_walk_next(&walk)) != NULL) {
> +		if (m->mport_type == MAE_MPORT_DESC_MPORT_TYPE_VNIC &&
> +		    m->interface_idx == nic_data->local_mae_intf &&
> +		    m->pf_idx == 0 &&
> +		    m->vf_idx == vf_idx) {
> +			*id = m->mport_id;
> +			rc = 0;
> +			break;
> +		}
> +	}
> +	rhashtable_walk_stop(&walk);
> +	rhashtable_walk_exit(&walk);
> +	return rc;
> +}
> +
>  static bool efx_mae_asl_id(u32 id)
>  {
>  	return !!(id & BIT(31));
> diff --git a/drivers/net/ethernet/sfc/mae.h b/drivers/net/ethernet/sfc/mae.h
> index daa29d2cde96..b9bf86c47cda 100644
> --- a/drivers/net/ethernet/sfc/mae.h
> +++ b/drivers/net/ethernet/sfc/mae.h
> @@ -96,4 +96,6 @@ int efx_mae_delete_rule(struct efx_nic *efx, u32 id);
>  int efx_init_mae(struct efx_nic *efx);
>  void efx_fini_mae(struct efx_nic *efx);
>  void efx_mae_remove_mport(void *desc, void *arg);
> +int efx_mae_fw_lookup_mport(struct efx_nic *efx, u32 selector, u32 *id);
> +int efx_mae_lookup_mport(struct efx_nic *efx, u32 vf, u32 *id);
>  #endif /* EF100_MAE_H */
> -- 
> 2.17.1