diff options
Diffstat (limited to 'datapath/dp_dev.c')
| -rw-r--r-- | datapath/dp_dev.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/datapath/dp_dev.c b/datapath/dp_dev.c new file mode 100644 index 00000000..8a749dbc --- /dev/null +++ b/datapath/dp_dev.c @@ -0,0 +1,210 @@ +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/workqueue.h> + +#include "datapath.h" +#include "dp_dev.h" + +struct datapath *dp_dev_get_dp(struct net_device *netdev) +{ + return dp_dev_priv(netdev)->dp; +} +EXPORT_SYMBOL(dp_dev_get_dp); + +static struct net_device_stats *dp_dev_get_stats(struct net_device *netdev) +{ + struct dp_dev *dp_dev = dp_dev_priv(netdev); + return &dp_dev->stats; +} + +int dp_dev_recv(struct net_device *netdev, struct sk_buff *skb) +{ + struct dp_dev *dp_dev = dp_dev_priv(netdev); + int len; + len = skb->len; + skb->pkt_type = PACKET_HOST; + skb->protocol = eth_type_trans(skb, netdev); + if (in_interrupt()) + netif_rx(skb); + else + netif_rx_ni(skb); + netdev->last_rx = jiffies; + dp_dev->stats.rx_packets++; + dp_dev->stats.rx_bytes += len; + return len; +} + +static int dp_dev_mac_addr(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + return 0; +} + +static int dp_dev_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct dp_dev *dp_dev = dp_dev_priv(netdev); + + /* By orphaning 'skb' we will screw up socket accounting slightly, but + * the effect is limited to the device queue length. If we don't + * do this, then the sk_buff will be destructed eventually, but it is + * harder to predict when. */ + skb_orphan(skb); + + /* We are going to modify 'skb', by sticking it on &dp_dev->xmit_queue, + * so we need to have our own clone. (At any rate, fwd_port_input() + * will need its own clone, so there's no benefit to queuing any other + * way.) */ + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + return 0; + + dp_dev->stats.tx_packets++; + dp_dev->stats.tx_bytes += skb->len; + + if (skb_queue_len(&dp_dev->xmit_queue) >= netdev->tx_queue_len) { + /* Queue overflow. Stop transmitter. */ + netif_stop_queue(netdev); + + /* We won't see all dropped packets individually, so overrun + * error is appropriate. */ + dp_dev->stats.tx_fifo_errors++; + } + skb_queue_tail(&dp_dev->xmit_queue, skb); + netdev->trans_start = jiffies; + + schedule_work(&dp_dev->xmit_work); + + return 0; +} + +static void dp_dev_do_xmit(struct work_struct *work) +{ + struct dp_dev *dp_dev = container_of(work, struct dp_dev, xmit_work); + struct datapath *dp = dp_dev->dp; + struct sk_buff *skb; + + while ((skb = skb_dequeue(&dp_dev->xmit_queue)) != NULL) { + skb_reset_mac_header(skb); + rcu_read_lock_bh(); + dp_process_received_packet(skb, dp->ports[dp_dev->port_no]); + rcu_read_unlock_bh(); + } + netif_wake_queue(dp_dev->dev); +} + +static int dp_dev_open(struct net_device *netdev) +{ + netif_start_queue(netdev); + return 0; +} + +static int dp_dev_stop(struct net_device *netdev) +{ + netif_stop_queue(netdev); + return 0; +} + +static void dp_getinfo(struct net_device *netdev, struct ethtool_drvinfo *info) +{ + struct dp_dev *dp_dev = dp_dev_priv(netdev); + strcpy(info->driver, "openvswitch"); + sprintf(info->bus_info, "%d", dp_dev->dp->dp_idx); +} + +static struct ethtool_ops dp_ethtool_ops = { + .get_drvinfo = dp_getinfo, + .get_link = ethtool_op_get_link, + .get_sg = ethtool_op_get_sg, + .get_tx_csum = ethtool_op_get_tx_csum, + .get_tso = ethtool_op_get_tso, +}; + +static void +do_setup(struct net_device *netdev) +{ + ether_setup(netdev); + + netdev->do_ioctl = dp_ioctl_hook; + netdev->get_stats = dp_dev_get_stats; + netdev->hard_start_xmit = dp_dev_xmit; + netdev->open = dp_dev_open; + SET_ETHTOOL_OPS(netdev, &dp_ethtool_ops); + netdev->stop = dp_dev_stop; + netdev->tx_queue_len = 100; + netdev->set_mac_address = dp_dev_mac_addr; + + netdev->flags = IFF_BROADCAST | IFF_MULTICAST; + + random_ether_addr(netdev->dev_addr); + + /* Set the OUI to the Nicira one. */ + netdev->dev_addr[0] = 0x00; + netdev->dev_addr[1] = 0x23; + netdev->dev_addr[2] = 0x20; + + /* Set the top bits to indicate random Nicira address. */ + netdev->dev_addr[3] |= 0xc0; +} + +/* Create a datapath device associated with 'dp'. If 'dp_name' is null, + * the device name will be of the form 'of<dp_idx>'. Returns the new device or + * an error code. + * + * Called with RTNL lock and dp_mutex. */ +struct net_device *dp_dev_create(struct datapath *dp, const char *dp_name, int port_no) +{ + struct dp_dev *dp_dev; + struct net_device *netdev; + char dev_name[IFNAMSIZ]; + int err; + + if (dp_name) { + if (strlen(dp_name) >= IFNAMSIZ) + return ERR_PTR(-EINVAL); + strncpy(dev_name, dp_name, sizeof(dev_name)); + } else + snprintf(dev_name, sizeof dev_name, "of%d", dp->dp_idx); + + netdev = alloc_netdev(sizeof(struct dp_dev), dev_name, do_setup); + if (!netdev) + return ERR_PTR(-ENOMEM); + + err = register_netdevice(netdev); + if (err) { + free_netdev(netdev); + return ERR_PTR(err); + } + + dp_dev = dp_dev_priv(netdev); + dp_dev->dp = dp; + dp_dev->port_no = port_no; + dp_dev->dev = netdev; + skb_queue_head_init(&dp_dev->xmit_queue); + INIT_WORK(&dp_dev->xmit_work, dp_dev_do_xmit); + return netdev; +} + +/* Called with RTNL lock and dp_mutex.*/ +void dp_dev_destroy(struct net_device *netdev) +{ + struct dp_dev *dp_dev = dp_dev_priv(netdev); + + netif_tx_disable(netdev); + synchronize_net(); + skb_queue_purge(&dp_dev->xmit_queue); + unregister_netdevice(netdev); +} + +int is_dp_dev(struct net_device *netdev) +{ + return netdev->open == dp_dev_open; +} +EXPORT_SYMBOL(is_dp_dev); |