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Date: Sat, 9 Jul 2011 14:11:08 +0200
From: Michal Miroslaw <mirq-linux@...e.qmqm.pl>
To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: davem@...emloft.net, Don Skidmore <donald.c.skidmore@...el.com>,
netdev@...r.kernel.org, gospo@...hat.com
Subject: Re: [net-next 5/5] ixgbe: convert to ndo_fix_features
On Sat, Jul 09, 2011 at 04:50:40AM -0700, Jeff Kirsher wrote:
> From: Don Skidmore <donald.c.skidmore@...el.com>
>
> Private rx_csum flags are now duplicate of netdev->features &
> NETIF_F_RXCSUM. We remove those duplicates and now use the net_device_ops
> ndo_set_features. This was based on the original patch submitted by
> Michal Miroslaw <mirq-linux@...e.qmqm.pl>. I also removed the special
> case not requiring a reset for X540 hardware. It is needed just as it is
> in 82599 hardware.
[...]
> --- a/drivers/net/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ixgbe/ixgbe_main.c
> @@ -7188,6 +7188,88 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
[...]
> +static int ixgbe_set_features(struct net_device *netdev, u32 data)
> +{
> + struct ixgbe_adapter *adapter = netdev_priv(netdev);
> + bool need_reset = false;
> +
> +#ifdef CONFIG_DCB
> + if ((adapter->flags & IXGBE_FLAG_DCB_ENABLED) &&
> + !(data & NETIF_F_HW_VLAN_RX))
> + return -EINVAL;
> +#endif
> + /* return error if RXHASH is being enabled when RSS is not supported */
> + if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED) &&
> + (data & NETIF_F_RXHASH))
> + return -EINVAL;
> +
> + /* If Rx checksum is disabled, then RSC/LRO should also be disabled */
> + if (!(data & NETIF_F_RXCSUM)) {
> + data &= ~NETIF_F_LRO;
> + adapter->flags &= ~IXGBE_FLAG_RX_CSUM_ENABLED;
> + } else {
> + adapter->flags |= IXGBE_FLAG_RX_CSUM_ENABLED;
> + }
The checks above should be done in ndo_fix_features callback. The check for
RSS_ENABLED for RXHASH is redundant, as the feature is removed in probe()
in this case (see [MARK] below).
> +
> + /* if state changes we need to update adapter->flags and reset */
> + if ((adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE) &&
> + (!!(data & NETIF_F_LRO) !=
> + !!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED))) {
> + if ((data & NETIF_F_LRO) &&
> + adapter->rx_itr_setting != 1 &&
> + adapter->rx_itr_setting > IXGBE_MAX_RSC_INT_RATE) {
> + e_info(probe, "rx-usecs set too low, "
> + "not enabling RSC\n");
> + } else {
> + adapter->flags2 ^= IXGBE_FLAG2_RSC_ENABLED;
> + switch (adapter->hw.mac.type) {
> + case ixgbe_mac_X540:
> + case ixgbe_mac_82599EB:
> + need_reset = true;
> + break;
> + default:
> + break;
> + }
> + }
> + }
> +
> + /*
> + * Check if Flow Director n-tuple support was enabled or disabled. If
> + * the state changed, we need to reset.
> + */
> + if (!(adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)) {
> + /* turn off ATR, enable perfect filters and reset */
> + if (data & NETIF_F_NTUPLE) {
> + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;
> + adapter->flags |= IXGBE_FLAG_FDIR_PERFECT_CAPABLE;
> + need_reset = true;
> + }
> + } else if (!(data & NETIF_F_NTUPLE)) {
> + /* turn off Flow Director, set ATR and reset */
> + adapter->flags &= ~IXGBE_FLAG_FDIR_PERFECT_CAPABLE;
> + if ((adapter->flags & IXGBE_FLAG_RSS_ENABLED) &&
> + !(adapter->flags & IXGBE_FLAG_DCB_ENABLED))
> + adapter->flags |= IXGBE_FLAG_FDIR_HASH_CAPABLE;
> + need_reset = true;
> + }
Part of the checks above should be in ndo_fix_features, too. ndo_set_features
should just enable what it has been passed. What ndo_fix_features callback
returns is further limited by generic checks, and then (if the resulting set
is different than current dev->features) ndo_set_features is called.
> +
> + if (need_reset)
> + ixgbe_do_reset(netdev);
> +
> + return 0;
> +
> +}
> +
> static const struct net_device_ops ixgbe_netdev_ops = {
> .ndo_open = ixgbe_open,
> .ndo_stop = ixgbe_close,
> @@ -7219,6 +7301,7 @@ static const struct net_device_ops ixgbe_netdev_ops = {
> .ndo_fcoe_disable = ixgbe_fcoe_disable,
> .ndo_fcoe_get_wwn = ixgbe_fcoe_get_wwn,
> #endif /* IXGBE_FCOE */
> + .ndo_set_features = ixgbe_set_features,
> };
>
> static void __devinit ixgbe_probe_vf(struct ixgbe_adapter *adapter,
> @@ -7486,20 +7569,24 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
>
> netdev->features = NETIF_F_SG |
> NETIF_F_IP_CSUM |
> + NETIF_F_IPV6_CSUM |
> NETIF_F_HW_VLAN_TX |
> NETIF_F_HW_VLAN_RX |
> - NETIF_F_HW_VLAN_FILTER;
> + NETIF_F_HW_VLAN_FILTER |
> + NETIF_F_TSO |
> + NETIF_F_TSO6 |
> + NETIF_F_GRO |
> + NETIF_F_RXHASH |
> + NETIF_F_RXCSUM;
>
> - netdev->features |= NETIF_F_IPV6_CSUM;
> - netdev->features |= NETIF_F_TSO;
> - netdev->features |= NETIF_F_TSO6;
> - netdev->features |= NETIF_F_GRO;
> - netdev->features |= NETIF_F_RXHASH;
> + netdev->hw_features = netdev->features;
>
> switch (adapter->hw.mac.type) {
> case ixgbe_mac_82599EB:
> case ixgbe_mac_X540:
> netdev->features |= NETIF_F_SCTP_CSUM;
> + netdev->hw_features |= NETIF_F_SCTP_CSUM |
> + NETIF_F_NTUPLE;
> break;
> default:
> break;
> @@ -7538,6 +7625,8 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
> netdev->vlan_features |= NETIF_F_HIGHDMA;
> }
>
> + if (adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE)
> + netdev->hw_features |= NETIF_F_LRO;
> if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
> netdev->features |= NETIF_F_LRO;
>
> @@ -7574,8 +7663,10 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
> if (err)
> goto err_sw_init;
>
> - if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
> + if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED)) {
> + netdev->hw_features &= ~NETIF_F_RXHASH;
> netdev->features &= ~NETIF_F_RXHASH;
> + }
>
[MARK here]
Best Regards,
Michał Mirosław
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