netdev - Re: [net-next v5 13/15] iecm: Add ethtool

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Date:   Mon, 24 Aug 2020 23:44:56 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net, Alice Michael <alice.michael@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jeffrey.t.kirsher@...el.com, Alan Brady <alan.brady@...el.com>,
        Phani Burra <phani.r.burra@...el.com>,
        Joshua Hay <joshua.a.hay@...el.com>,
        Madhu Chittim <madhu.chittim@...el.com>,
        Pavan Kumar Linga <pavan.kumar.linga@...el.com>,
        Donald Skidmore <donald.c.skidmore@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>
Subject: Re: [net-next v5 13/15] iecm: Add ethtool

On Mon, Aug 24, 2020 at 10:33:04AM -0700, Tony Nguyen wrote:
> From: Alice Michael <alice.michael@...el.com>
> 
> Implement ethtool interface for the common module.
> 
> Signed-off-by: Alice Michael <alice.michael@...el.com>
> Signed-off-by: Alan Brady <alan.brady@...el.com>
> Signed-off-by: Phani Burra <phani.r.burra@...el.com>
> Signed-off-by: Joshua Hay <joshua.a.hay@...el.com>
> Signed-off-by: Madhu Chittim <madhu.chittim@...el.com>
> Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@...el.com>
> Reviewed-by: Donald Skidmore <donald.c.skidmore@...el.com>
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
[...]
> +static void iecm_get_channels(struct net_device *netdev,
> +			      struct ethtool_channels *ch)
> +{
> +	struct iecm_vport *vport = iecm_netdev_to_vport(netdev);
> +	unsigned int combined;
> +
> +	combined = min(vport->num_txq, vport->num_rxq);
> +
> +	/* Report maximum channels */
> +	ch->max_combined = IECM_MAX_Q;
> +
> +	ch->max_other = IECM_MAX_NONQ;
> +	ch->other_count = IECM_MAX_NONQ;
> +
> +	ch->combined_count = combined;
> +	ch->rx_count = vport->num_rxq - combined;
> +	ch->tx_count = vport->num_txq - combined;
> +}

You don't set max_rx and max_tx so that they will be always reported
as 0. If vport->num_rxq != vport->num_txq, one of rx_count, tx_count
will be higher than corresponding maximum so that any "set channels"
request not touching that value will fail the sanity check in
ethnl_set_channels() or ethtool_set_channels().

> +
> +/**
> + * iecm_set_channels: set the new channel count
> + * @netdev: network interface device structure
> + * @ch: channel information structure
> + *
> + * Negotiate a new number of channels with CP. Returns 0 on success, negative
> + * on failure.
> + */
> +static int iecm_set_channels(struct net_device *netdev,
> +			     struct ethtool_channels *ch)
> +{
> +	struct iecm_vport *vport = iecm_netdev_to_vport(netdev);
> +	int num_req_q = ch->combined_count;
> +
> +	if (num_req_q == max(vport->num_txq, vport->num_rxq))
> +		return 0;
> +
> +	vport->adapter->config_data.num_req_qs = num_req_q;
> +
> +	return iecm_initiate_soft_reset(vport, __IECM_SR_Q_CHANGE);
> +}

In iecm_get_channels() you set combined_count to minimum of num_rxq and
num_txq but here you expect it to be the maximum. And you also
completely ignore everything else than combined_count. Can this ever
work correctly if num_rxq != num_txq?

> +static int iecm_set_ringparam(struct net_device *netdev,
> +			      struct ethtool_ringparam *ring)
> +{
> +	struct iecm_vport *vport = iecm_netdev_to_vport(netdev);
> +	u32 new_rx_count, new_tx_count;
> +
> +	if (ring->rx_mini_pending || ring->rx_jumbo_pending)
> +		return -EINVAL;

This will be caught by the generic sanity check in ethnl_set_rings() or
ethtool_set_ringparam().

Michal

> +
> +	new_tx_count = ALIGN(ring->tx_pending, IECM_REQ_DESC_MULTIPLE);
> +	new_rx_count = ALIGN(ring->rx_pending, IECM_REQ_DESC_MULTIPLE);
> +
> +	/* if nothing to do return success */
> +	if (new_tx_count == vport->txq_desc_count &&
> +	    new_rx_count == vport->rxq_desc_count)
> +		return 0;
> +
> +	vport->adapter->config_data.num_req_txq_desc = new_tx_count;
> +	vport->adapter->config_data.num_req_rxq_desc = new_rx_count;
> +
> +	return iecm_initiate_soft_reset(vport, __IECM_SR_Q_DESC_CHANGE);
> +}