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Message-ID: <20120714055508.GC4808@jonmason-lab>
Date: Fri, 13 Jul 2012 22:55:09 -0700
From: Jon Mason <jon.mason@...el.com>
To: Stephen Hemminger <shemminger@...tta.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-pci@...r.kernel.org, Dave Jiang <dave.jiang@...el.com>
Subject: Re: [RFC 2/2] net: Add support for NTB virtual ethernet device
On Fri, Jul 13, 2012 at 05:08:26PM -0700, Stephen Hemminger wrote:
> On Fri, 13 Jul 2012 14:45:00 -0700
> Jon Mason <jon.mason@...el.com> wrote:
>
> > A virtual ethernet device that uses the NTB transport API to send/receive data.
> >
> > Signed-off-by: Jon Mason <jon.mason@...el.com>
> > ---
> > drivers/net/Kconfig | 4 +
> > drivers/net/Makefile | 1 +
> > drivers/net/ntb_netdev.c | 411 ++++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 416 insertions(+), 0 deletions(-)
> > create mode 100644 drivers/net/ntb_netdev.c
>
>
> > +static void ntb_get_drvinfo(__attribute__((unused)) struct net_device *dev,
> > + struct ethtool_drvinfo *info)
> > +{
> > + strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
> > + strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version));
> > +}
> > +
> > +static const char ntb_nic_stats[][ETH_GSTRING_LEN] = {
> > + "rx_packets", "rx_bytes", "rx_errors", "rx_dropped", "rx_length_errors",
> > + "rx_frame_errors", "rx_fifo_errors",
> > + "tx_packets", "tx_bytes", "tx_errors", "tx_dropped",
> > +};
> > +
> > +static int ntb_get_stats_count(__attribute__((unused)) struct net_device *dev)
> > +{
> > + return ARRAY_SIZE(ntb_nic_stats);
> > +}
> > +
> > +static int ntb_get_sset_count(struct net_device *dev, int sset)
> > +{
> > + switch (sset) {
> > + case ETH_SS_STATS:
> > + return ntb_get_stats_count(dev);
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static void ntb_get_strings(__attribute__((unused)) struct net_device *dev,
> > + u32 sset, u8 *data)
> > +{
> > + switch (sset) {
> > + case ETH_SS_STATS:
> > + memcpy(data, *ntb_nic_stats, sizeof(ntb_nic_stats));
> > + }
> > +}
> > +
> > +static void
> > +ntb_get_ethtool_stats(struct net_device *dev,
> > + __attribute__((unused)) struct ethtool_stats *stats,
> > + u64 *data)
> > +{
> > + int i = 0;
> > +
> > + data[i++] = dev->stats.rx_packets;
> > + data[i++] = dev->stats.rx_bytes;
> > + data[i++] = dev->stats.rx_errors;
> > + data[i++] = dev->stats.rx_dropped;
> > + data[i++] = dev->stats.rx_length_errors;
> > + data[i++] = dev->stats.rx_frame_errors;
> > + data[i++] = dev->stats.rx_fifo_errors;
> > + data[i++] = dev->stats.tx_packets;
> > + data[i++] = dev->stats.tx_bytes;
> > + data[i++] = dev->stats.tx_errors;
> > + data[i++] = dev->stats.tx_dropped;
> > +}
>
> These statistics add no value over existing network stats.
> Don't implement ethtool stats unless device has something more
> interesting to say.
Fair enough
>
> > +static const struct ethtool_ops ntb_ethtool_ops = {
> > + .get_drvinfo = ntb_get_drvinfo,
> > + .get_sset_count = ntb_get_sset_count,
> > + .get_strings = ntb_get_strings,
> > + .get_ethtool_stats = ntb_get_ethtool_stats,
> > + .get_link = ethtool_op_get_link,
> > +};
>
> If you want to implement bonding or bridging then implementing
> get_settings would help.
Will do.
> > +static int __init ntb_netdev_init_module(void)
> > +{
> > + struct ntb_netdev *dev;
> > + int rc;
> > +
> > + pr_info("%s: Probe\n", KBUILD_MODNAME);
>
> Useless message
True, will remove.
Thanks for the comments!
> > + netdev = alloc_etherdev(sizeof(struct ntb_netdev));
> > + if (!netdev)
> > + return -ENOMEM;
> > +
> > + dev = netdev_priv(netdev);
> > + dev->ndev = netdev;
> > + netdev->features = NETIF_F_HIGHDMA;
> > +
> > + netdev->hw_features = netdev->features;
> > + netdev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS);
> > +
> > + random_ether_addr(netdev->perm_addr);
> > + memcpy(netdev->dev_addr, netdev->perm_addr, netdev->addr_len);
> > +
> > + netdev->netdev_ops = &ntb_netdev_ops;
> > + SET_ETHTOOL_OPS(netdev, &ntb_ethtool_ops);
> > +
> > + dev->qp = ntb_transport_create_queue(ntb_netdev_rx_handler,
> > + ntb_netdev_tx_handler,
> > + ntb_netdev_event_handler);
> > + if (!dev->qp) {
> > + rc = -EIO;
> > + goto err;
> > + }
> > +
> > + netdev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN;
> > +
> > + rc = register_netdev(netdev);
> > + if (rc)
> > + goto err1;
> > +
> > + pr_info("%s: %s created\n", KBUILD_MODNAME, netdev->name);
> > + return 0;
> > +
> > +err1:
> > + ntb_transport_free_queue(dev->qp);
> > +err:
> > + free_netdev(netdev);
> > + return rc;
> > +}
> > +module_init(ntb_netdev_init_module);
> > +
> > +static void __exit ntb_netdev_exit_module(void)
> > +{
> > + struct ntb_netdev *dev = netdev_priv(netdev);
> > +
> > + unregister_netdev(netdev);
> > + ntb_transport_free_queue(dev->qp);
> > + free_netdev(netdev);
> > +
> > + pr_info("%s: Driver removed\n", KBUILD_MODNAME);
> > +}
> > +module_exit(ntb_netdev_exit_module);
>
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