netdev - Re: [PATCH v2 net 2/2] dpaa2-eth: Fix TX FQID values

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Date:   Tue, 15 Oct 2019 12:36:03 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        Ioana Radulescu <ruxandra.radulescu@....com>
Subject: Re: [PATCH v2 net 2/2] dpaa2-eth: Fix TX FQID values

On Mon, 14 Oct 2019 12:25:17 +0300, Ioana Ciornei wrote:
> From: Ioana Radulescu <ruxandra.radulescu@....com>
> 
> Depending on when MC connects the DPNI to a MAC, Tx FQIDs may
> not be available during probe time.
> 
> Read the FQIDs each time the link goes up to avoid using invalid
> values. In case an error occurs or an invalid value is retrieved,
> fall back to QDID-based enqueueing.
> 
> Fixes: 1fa0f68c9255 ("dpaa2-eth: Use FQ-based DPIO enqueue API")
> Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> Changes in v2:
>  - used reverse christmas tree ordering in update_tx_fqids
> 
>  drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 42 ++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> index 5acd734a216b..c3c2c06195ae 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> @@ -1235,6 +1235,8 @@ static void dpaa2_eth_set_rx_taildrop(struct dpaa2_eth_priv *priv, bool enable)
>  	priv->rx_td_enabled = enable;
>  }
>  
> +static void update_tx_fqids(struct dpaa2_eth_priv *priv);
> 
>  static int link_state_update(struct dpaa2_eth_priv *priv)
>  {
>  	struct dpni_link_state state = {0};
> @@ -1261,6 +1263,7 @@ static int link_state_update(struct dpaa2_eth_priv *priv)
>  		goto out;
>  
>  	if (state.up) {
> +		update_tx_fqids(priv);
>  		netif_carrier_on(priv->net_dev);
>  		netif_tx_start_all_queues(priv->net_dev);
>  	} else {
> @@ -2533,6 +2536,45 @@ static int set_pause(struct dpaa2_eth_priv *priv)
>  	return 0;
>  }
>  
> +static void update_tx_fqids(struct dpaa2_eth_priv *priv)
> +{
> +	struct dpni_queue_id qid = {0};
> +	struct dpaa2_eth_fq *fq;
> +	struct dpni_queue queue;
> +	int i, j, err;
> +
> +	/* We only use Tx FQIDs for FQID-based enqueue, so check
> +	 * if DPNI version supports it before updating FQIDs
> +	 */
> +	if (dpaa2_eth_cmp_dpni_ver(priv, DPNI_ENQUEUE_FQID_VER_MAJOR,
> +				   DPNI_ENQUEUE_FQID_VER_MINOR) < 0)
> +		return;
> +
> +	for (i = 0; i < priv->num_fqs; i++) {
> +		fq = &priv->fq[i];
> +		if (fq->type != DPAA2_TX_CONF_FQ)
> +			continue;
> +		for (j = 0; j < dpaa2_eth_tc_count(priv); j++) {
> +			err = dpni_get_queue(priv->mc_io, 0, priv->mc_token,
> +					     DPNI_QUEUE_TX, j, fq->flowid,
> +					     &queue, &qid);
> +			if (err)
> +				goto out_err;
> +
> +			fq->tx_fqid[j] = qid.fqid;
> +			if (fq->tx_fqid[j] == 0)
> +				goto out_err;
> +		}
> +	}
> +
> +	return;
> +
> +out_err:
> +	netdev_info(priv->net_dev,
> +		    "Error reading Tx FQID, fallback to QDID-based enqueue");

Missing new line at the end of this message, I think.

> +	priv->enqueue = dpaa2_eth_enqueue_qd;

Should the enqueue be set to dpaa2_eth_enqueue_fq config was successful?
IOW if there is a transient error we should go back to the preferred
method?

> +}