On Fri, 13 Jul 2012 14:45:00 -0700
Jon Mason <jon.mason@xxxxxxxxx> wrote:
> A virtual ethernet device that uses the NTB transport API to send/receive data.
>
> Signed-off-by: Jon Mason <jon.mason@xxxxxxxxx>
> ---
> 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.
> +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.
> +static int __init ntb_netdev_init_module(void)
> +{
> + struct ntb_netdev *dev;
> + int rc;
> +
> + pr_info("%s: Probe\n", KBUILD_MODNAME);
Useless message
> + 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);
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
