netdev - Re: [PATCH net-next 1/5] net: aquantia: Ethtool based ring size configuration

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Message-ID: <20180529120403.3f89a394@cakuba>
Date:   Tue, 29 May 2018 12:04:03 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Igor Russkikh <igor.russkikh@...antia.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        David Arcari <darcari@...hat.com>,
        Pavel Belous <pavel.belous@...antia.com>,
        Anton Mikaev <amikaev@...antia.com>
Subject: Re: [PATCH net-next 1/5] net: aquantia: Ethtool based ring size
 configuration

On Tue, 29 May 2018 15:56:58 +0300, Igor Russkikh wrote:
> +static int aq_set_ringparam(struct net_device *ndev,
> +			    struct ethtool_ringparam *ring)
> +{
> +	int err = 0;
> +	struct aq_nic_s *aq_nic = netdev_priv(ndev);
> +	struct aq_nic_cfg_s *aq_nic_cfg = aq_nic_get_cfg(aq_nic);
> +	const struct aq_hw_caps_s *hw_caps = aq_nic_cfg->aq_hw_caps;
> +
> +	if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
> +		err = -EOPNOTSUPP;
> +		goto err_exit;
> +	}
> +
> +	spin_lock(&aq_nic->aq_spinlock);
> +
> +	if (netif_running(ndev))
> +		dev_close(ndev);

I don't think you can hold a spinlock around dev_close()/dev_open()
calls.

> +	aq_nic_free_vectors(aq_nic);
> +
> +	aq_nic_cfg->rxds = max(ring->rx_pending, hw_caps->rxds_min);
> +	aq_nic_cfg->rxds = min(aq_nic_cfg->rxds, hw_caps->rxds_max);
> +	aq_nic_cfg->rxds = ALIGN(aq_nic_cfg->rxds, AQ_HW_RXD_MULTIPLE);
> +
> +	aq_nic_cfg->txds = max(ring->tx_pending, hw_caps->txds_min);
> +	aq_nic_cfg->txds = min(aq_nic_cfg->txds, hw_caps->txds_max);
> +	aq_nic_cfg->txds = ALIGN(aq_nic_cfg->txds, AQ_HW_TXD_MULTIPLE);
> +
> +	for (aq_nic->aq_vecs = 0; aq_nic->aq_vecs < aq_nic_cfg->vecs;
> +	     aq_nic->aq_vecs++) {
> +		aq_nic->aq_vec[aq_nic->aq_vecs] =
> +		    aq_vec_alloc(aq_nic, aq_nic->aq_vecs, aq_nic_cfg);
> +		if (unlikely(!aq_nic->aq_vec[aq_nic->aq_vecs])) {
> +			err = -ENOMEM;
> +			goto err_unlock;
> +		}
> +	}
> +	if (!netif_running(ndev))
> +		err = dev_open(ndev);

Will this not open the device regardless if it was open before or not?

> +err_unlock:
> +	spin_unlock(&aq_nic->aq_spinlock);
> +err_exit:
> +	return err;
> +}