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Date: Thu, 31 Mar 2011 12:13:30 +0100
From: Ian Campbell <Ian.Campbell@...citrix.com>
To: Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH RESEND] net: convert xen-netfront to hw_features
On Thu, 2011-03-31 at 12:01 +0100, Michał Mirosław wrote:
> Not tested in any way. The original code for offload setting seems broken
> as it resets the features on every netback reconnect.
Thanks, I've got a pending TODO item to test this and propagate similar
changes to netback. I hope to get to it soon...
Is this urgent (for 2.6.39) IYHO? I think it's been broken this way for
a long time now...
Ian.
>
> This will set GSO_ROBUST at device creation time (earlier than connect time).
>
> RX checksum offload is forced on - so advertise as it is.
>
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
> [I don't know Xen code enough to say this is correct. There is Xen netback
> driver coming in, that has similar changes to be made. Please match
> them up if you can.]
>
> drivers/net/xen-netfront.c | 57 +++++++++++++++++--------------------------
> 1 files changed, 23 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index 5c8d9c3..2a71c9f 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1148,6 +1148,8 @@ static const struct net_device_ops xennet_netdev_ops = {
> .ndo_change_mtu = xennet_change_mtu,
> .ndo_set_mac_address = eth_mac_addr,
> .ndo_validate_addr = eth_validate_addr,
> + .ndo_fix_features = xennet_fix_features,
> + .ndo_set_features = xennet_set_features,
> };
>
> static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev)
> @@ -1209,7 +1211,9 @@ static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev
> netdev->netdev_ops = &xennet_netdev_ops;
>
> netif_napi_add(netdev, &np->napi, xennet_poll, 64);
> - netdev->features = NETIF_F_IP_CSUM;
> + netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
> + NETIF_F_GSO_ROBUST;
> + netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
>
> SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
> SET_NETDEV_DEV(netdev, &dev->dev);
> @@ -1510,52 +1514,40 @@ again:
> return err;
> }
>
> -static int xennet_set_sg(struct net_device *dev, u32 data)
> +static u32 xennet_fix_features(struct net_device *dev, u32 features)
> {
> - if (data) {
> - struct netfront_info *np = netdev_priv(dev);
> - int val;
> + struct netfront_info *np = netdev_priv(dev);
> + int val;
>
> + if (features & NETIF_F_SG) {
> if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
> "%d", &val) < 0)
> val = 0;
> +
> if (!val)
> - return -ENOSYS;
> - } else if (dev->mtu > ETH_DATA_LEN)
> - dev->mtu = ETH_DATA_LEN;
> -
> - return ethtool_op_set_sg(dev, data);
> -}
> -
> -static int xennet_set_tso(struct net_device *dev, u32 data)
> -{
> - if (data) {
> - struct netfront_info *np = netdev_priv(dev);
> - int val;
> + features &= ~NETIF_F_SG;
> + }
>
> + if (features & NETIF_F_TSO) {
> if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
> "feature-gso-tcpv4", "%d", &val) < 0)
> val = 0;
> +
> if (!val)
> - return -ENOSYS;
> + features &= ~NETIF_F_TSO;
> }
>
> - return ethtool_op_set_tso(dev, data);
> + return features;
> }
>
> -static void xennet_set_features(struct net_device *dev)
> +static int xennet_set_features(struct net_device *dev, u32 features)
> {
> - /* Turn off all GSO bits except ROBUST. */
> - dev->features &= ~NETIF_F_GSO_MASK;
> - dev->features |= NETIF_F_GSO_ROBUST;
> - xennet_set_sg(dev, 0);
> + if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
> + netdev_info(dev, "Reducing MTU because no SG offload");
> + dev->mtu = ETH_DATA_LEN;
> + }
>
> - /* We need checksum offload to enable scatter/gather and TSO. */
> - if (!(dev->features & NETIF_F_IP_CSUM))
> - return;
> -
> - if (!xennet_set_sg(dev, 1))
> - xennet_set_tso(dev, 1);
> + return 0;
> }
>
> static int xennet_connect(struct net_device *dev)
> @@ -1582,7 +1574,7 @@ static int xennet_connect(struct net_device *dev)
> if (err)
> return err;
>
> - xennet_set_features(dev);
> + netdev_update_features(dev);
>
> spin_lock_bh(&np->rx_lock);
> spin_lock_irq(&np->tx_lock);
> @@ -1710,9 +1702,6 @@ static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
>
> static const struct ethtool_ops xennet_ethtool_ops =
> {
> - .set_tx_csum = ethtool_op_set_tx_csum,
> - .set_sg = xennet_set_sg,
> - .set_tso = xennet_set_tso,
> .get_link = ethtool_op_get_link,
>
> .get_sset_count = xennet_get_sset_count,
--
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