/*
- * Copyright (c) 2010 Nicira Networks.
+ * Copyright (c) 2010, 2011 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
#include <net/llc.h>
+#include "checksum.h"
#include "datapath.h"
+#include "vlan.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"
-#include "compat.h"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
+ !defined(HAVE_VLAN_BUG_WORKAROUND)
+#include <linux/module.h>
-struct vport_ops netdev_vport_ops;
+static int vlan_tso __read_mostly = 0;
+module_param(vlan_tso, int, 0644);
+MODULE_PARM_DESC(vlan_tso, "Enable TSO for VLAN packets");
+#else
+#define vlan_tso true
+#endif
-static void netdev_port_receive(struct net_bridge_port *, struct sk_buff *);
+/* If the native device stats aren't 64 bit use the vport stats tracking instead. */
+#define USE_VPORT_STATS (sizeof(((struct net_device_stats *)0)->rx_bytes) < sizeof(u64))
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
-static struct llc_sap *netdev_stp_sap;
+static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
-static int
-netdev_stp_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt, struct net_device *orig_dev)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+/* Called with rcu_read_lock and bottom-halves disabled. */
+static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
{
- /* We don't really care about STP packets, we just listen for them for
- * mutual exclusion with the bridge module, so this just discards
- * them. */
- kfree_skb(skb);
- return 0;
-}
+ struct vport *vport;
-static int
-netdev_avoid_bridge_init(void)
-{
- /* Register to receive STP packets because the bridge module also
- * attempts to do so. Since there can only be a single listener for a
- * given protocol, this provides mutual exclusion against the bridge
- * module, preventing both of them from being loaded at the same
- * time. */
- netdev_stp_sap = llc_sap_open(LLC_SAP_BSPAN, netdev_stp_rcv);
- if (!netdev_stp_sap) {
- printk(KERN_ERR "openvswitch: can't register sap for STP (probably the bridge module is loaded)\n");
- return -EADDRINUSE;
- }
- return 0;
-}
+ if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+ return skb;
-static void
-netdev_avoid_bridge_exit(void)
-{
- llc_sap_put(netdev_stp_sap);
-}
-#else /* Linux 2.6.27 or later. */
-static int
-netdev_avoid_bridge_init(void)
-{
- /* Linux 2.6.27 introduces a way for multiple clients to register for
- * STP packets, which interferes with what we try to do above.
- * Instead, just check whether there's a bridge hook defined. This is
- * not as safe--the bridge module is willing to load over the top of
- * us--but it provides a little bit of protection. */
- if (br_handle_frame_hook) {
- printk(KERN_ERR "openvswitch: bridge module is loaded, cannot load over it\n");
- return -EADDRINUSE;
- }
- return 0;
-}
+ vport = netdev_get_vport(skb->dev);
-static void
-netdev_avoid_bridge_exit(void)
-{
- /* Nothing to do. */
-}
-#endif /* Linux 2.6.27 or later */
+ netdev_port_receive(vport, skb);
+ return NULL;
+}
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
/*
* Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
* different set of devices!)
*/
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
/* Called with rcu_read_lock and bottom-halves disabled. */
-static struct sk_buff *
-netdev_frame_hook(struct net_bridge_port *p, struct sk_buff *skb)
+static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
+ struct sk_buff *skb)
{
- netdev_port_receive(p, skb);
+ netdev_port_receive((struct vport *)p, skb);
return NULL;
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+/*
+ * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
+ * different set of devices!)
+ */
/* Called with rcu_read_lock and bottom-halves disabled. */
-static int
-netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
+static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
{
- netdev_port_receive(p, *pskb);
+ netdev_port_receive((struct vport *)p, *pskb);
return 1;
}
#else
#error
#endif
-static int
-netdev_init(void)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+static int netdev_init(void) { return 0; }
+static void netdev_exit(void) { }
+#else
+static int netdev_init(void)
{
- int err;
-
- err = netdev_avoid_bridge_init();
- if (err)
- return err;
-
/* Hook into callback used by the bridge to intercept packets.
* Parasites we are. */
br_handle_frame_hook = netdev_frame_hook;
return 0;
}
-static void
-netdev_exit(void)
+static void netdev_exit(void)
{
br_handle_frame_hook = NULL;
- netdev_avoid_bridge_exit();
}
+#endif
-static struct vport *
-netdev_create(const char *name, const void __user *config)
+static struct vport *netdev_create(const struct vport_parms *parms)
{
struct vport *vport;
struct netdev_vport *netdev_vport;
int err;
- vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops);
+ vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops, parms);
if (IS_ERR(vport)) {
err = PTR_ERR(vport);
goto error;
netdev_vport = netdev_vport_priv(vport);
- netdev_vport->dev = dev_get_by_name(&init_net, name);
+ netdev_vport->dev = dev_get_by_name(&init_net, parms->name);
if (!netdev_vport->dev) {
err = -ENODEV;
goto error_free_vport;
goto error_put;
}
- if (netdev_vport->dev->br_port) {
- err = -EBUSY;
- goto error_put;
+ /* If we are using the vport stats layer initialize it to the current
+ * values so we are roughly consistent with the device stats. */
+ if (USE_VPORT_STATS) {
+ struct rtnl_link_stats64 stats;
+
+ err = netdev_get_stats(vport, &stats);
+ if (!err)
+ vport_set_stats(vport, &stats);
}
+ err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
+ vport);
+ if (err)
+ goto error_put;
+
+ dev_set_promiscuity(netdev_vport->dev, 1);
+ dev_disable_lro(netdev_vport->dev);
+ netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
+
return vport;
error_put:
return ERR_PTR(err);
}
-static int
-netdev_destroy(struct vport *vport)
-{
- struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
-
- dev_put(netdev_vport->dev);
- vport_free(vport);
-
- return 0;
-}
-
-static int
-netdev_attach(struct vport *vport)
+static int netdev_destroy(struct vport *vport)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
- dev_set_promiscuity(netdev_vport->dev, 1);
- dev_disable_lro(netdev_vport->dev);
- rcu_assign_pointer(netdev_vport->dev->br_port, (struct net_bridge_port *)vport);
-
- return 0;
-}
+ netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
+ netdev_rx_handler_unregister(netdev_vport->dev);
+ dev_set_promiscuity(netdev_vport->dev, -1);
-static int
-netdev_detach(struct vport *vport)
-{
- struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+ synchronize_rcu();
- rcu_assign_pointer(netdev_vport->dev->br_port, NULL);
- dev_set_promiscuity(netdev_vport->dev, -1);
+ dev_put(netdev_vport->dev);
+ vport_free(vport);
return 0;
}
-int
-netdev_set_mtu(struct vport *vport, int mtu)
+int netdev_set_mtu(struct vport *vport, int mtu)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return dev_set_mtu(netdev_vport->dev, mtu);
}
-int
-netdev_set_addr(struct vport *vport, const unsigned char *addr)
+int netdev_set_addr(struct vport *vport, const unsigned char *addr)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
struct sockaddr sa;
return dev_set_mac_address(netdev_vport->dev, &sa);
}
-const char *
-netdev_get_name(const struct vport *vport)
+const char *netdev_get_name(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->name;
}
-const unsigned char *
-netdev_get_addr(const struct vport *vport)
+const unsigned char *netdev_get_addr(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->dev_addr;
}
-struct kobject *
-netdev_get_kobj(const struct vport *vport)
+struct kobject *netdev_get_kobj(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return &netdev_vport->dev->NETDEV_DEV_MEMBER.kobj;
}
-int
-netdev_get_stats(const struct vport *vport, struct odp_vport_stats *stats)
+int netdev_get_stats(const struct vport *vport, struct rtnl_link_stats64 *stats)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
- const struct net_device_stats *netdev_stats;
-
- netdev_stats = dev_get_stats(netdev_vport->dev);
-
- stats->rx_bytes = netdev_stats->rx_bytes;
- stats->rx_packets = netdev_stats->rx_packets;
- stats->tx_bytes = netdev_stats->tx_bytes;
- stats->tx_packets = netdev_stats->tx_packets;
- stats->rx_dropped = netdev_stats->rx_dropped;
- stats->rx_errors = netdev_stats->rx_errors;
- stats->rx_frame_err = netdev_stats->rx_frame_errors;
- stats->rx_over_err = netdev_stats->rx_over_errors;
- stats->rx_crc_err = netdev_stats->rx_crc_errors;
- stats->tx_dropped = netdev_stats->tx_dropped;
- stats->tx_errors = netdev_stats->tx_errors;
- stats->collisions = netdev_stats->collisions;
-
+ dev_get_stats(netdev_vport->dev, stats);
return 0;
}
-unsigned
-netdev_get_dev_flags(const struct vport *vport)
+unsigned netdev_get_dev_flags(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return dev_get_flags(netdev_vport->dev);
}
-int
-netdev_is_running(const struct vport *vport)
+int netdev_is_running(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netif_running(netdev_vport->dev);
}
-unsigned char
-netdev_get_operstate(const struct vport *vport)
+unsigned char netdev_get_operstate(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->operstate;
}
-int
-netdev_get_ifindex(const struct vport *vport)
+int netdev_get_ifindex(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->ifindex;
}
-int
-netdev_get_iflink(const struct vport *vport)
+int netdev_get_iflink(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->iflink;
}
-int
-netdev_get_mtu(const struct vport *vport)
+int netdev_get_mtu(const struct vport *vport)
{
const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
return netdev_vport->dev->mtu;
}
/* Must be called with rcu_read_lock. */
-static void
-netdev_port_receive(struct net_bridge_port *p, struct sk_buff *skb)
+static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
{
- struct vport *vport = (struct vport *)p;
-
/* Make our own copy of the packet. Otherwise we will mangle the
* packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
* (No one comes after us, since we tell handle_bridge() that we took
* the packet.) */
skb = skb_share_check(skb, GFP_ATOMIC);
- if (!skb)
+ if (unlikely(!skb))
return;
- /* Push the Ethernet header back on. */
+ skb_warn_if_lro(skb);
+
skb_push(skb, ETH_HLEN);
- skb_reset_mac_header(skb);
compute_ip_summed(skb, false);
+ vlan_copy_skb_tci(skb);
vport_receive(vport, skb);
}
-static int
-netdev_send(struct vport *vport, struct sk_buff *skb)
+static bool dev_supports_vlan_tx(struct net_device *dev)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
+ /* Software fallback means every device supports vlan_tci on TX. */
+ return true;
+#elif defined(HAVE_VLAN_BUG_WORKAROUND)
+ return dev->features & NETIF_F_HW_VLAN_TX;
+#else
+ /* Assume that the driver is buggy. */
+ return false;
+#endif
+}
+
+static int netdev_send(struct vport *vport, struct sk_buff *skb)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
- int len = skb->len;
+ int len;
skb->dev = netdev_vport->dev;
forward_ip_summed(skb);
+
+ if (vlan_tx_tag_present(skb) && !dev_supports_vlan_tx(skb->dev)) {
+ int err;
+ int features = 0;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+ features = skb->dev->features & skb->dev->vlan_features;
+#endif
+
+ err = vswitch_skb_checksum_setup(skb);
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return 0;
+ }
+
+ if (!vlan_tso)
+ features &= ~(NETIF_F_TSO | NETIF_F_TSO6 |
+ NETIF_F_UFO | NETIF_F_FSO);
+
+ if (skb_is_gso(skb) &&
+ (!skb_gso_ok(skb, features) ||
+ unlikely(skb->ip_summed != CHECKSUM_PARTIAL))) {
+ struct sk_buff *nskb;
+
+ nskb = skb_gso_segment(skb, features);
+ if (!nskb) {
+ if (unlikely(skb_cloned(skb) &&
+ pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) {
+ kfree_skb(skb);
+ return 0;
+ }
+
+ skb_shinfo(skb)->gso_type &= ~SKB_GSO_DODGY;
+ goto tag;
+ }
+
+ kfree_skb(skb);
+ skb = nskb;
+ if (IS_ERR(skb))
+ return 0;
+
+ len = 0;
+ do {
+ nskb = skb->next;
+ skb->next = NULL;
+
+ skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
+ if (likely(skb)) {
+ len += skb->len;
+ vlan_set_tci(skb, 0);
+ dev_queue_xmit(skb);
+ }
+
+ skb = nskb;
+ } while (skb);
+
+ return len;
+ }
+
+tag:
+ skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
+ if (unlikely(!skb))
+ return 0;
+ vlan_set_tci(skb, 0);
+ }
+
+ len = skb->len;
dev_queue_xmit(skb);
return len;
}
/* Returns null if this device is not attached to a datapath. */
-struct vport *
-netdev_get_vport(struct net_device *dev)
+struct vport *netdev_get_vport(struct net_device *dev)
{
- return (struct vport *)dev->br_port;
+#ifdef IFF_BRIDGE_PORT
+#if IFF_BRIDGE_PORT != IFF_OVS_DATAPATH
+ if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
+#else
+ if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
+#endif
+ return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
+ else
+ return NULL;
+#else
+ return (struct vport *)rcu_dereference_rtnl(dev->br_port);
+#endif
}
-struct vport_ops netdev_vport_ops = {
- .type = "netdev",
- .flags = VPORT_F_REQUIRED,
+const struct vport_ops netdev_vport_ops = {
+ .type = ODP_VPORT_TYPE_NETDEV,
+ .flags = (VPORT_F_REQUIRED |
+ (USE_VPORT_STATS ? VPORT_F_GEN_STATS : 0)),
.init = netdev_init,
.exit = netdev_exit,
.create = netdev_create,
.destroy = netdev_destroy,
- .attach = netdev_attach,
- .detach = netdev_detach,
.set_mtu = netdev_set_mtu,
.set_addr = netdev_set_addr,
.get_name = netdev_get_name,
.get_mtu = netdev_get_mtu,
.send = netdev_send,
};
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+/*
+ * In kernels earlier than 2.6.36, Open vSwitch cannot safely coexist with
+ * the Linux bridge module on any released version of Linux, because there
+ * is only a single bridge hook function and only a single br_port member
+ * in struct net_device.
+ *
+ * Declaring and exporting this symbol enforces mutual exclusion. The bridge
+ * module also exports the same symbol, so the module loader will refuse to
+ * load both modules at the same time (e.g. "bridge: exports duplicate symbol
+ * br_should_route_hook (owned by openvswitch_mod)").
+ *
+ * The use of "typeof" here avoids the need to track changes in the type of
+ * br_should_route_hook over various kernel versions.
+ */
+typeof(br_should_route_hook) br_should_route_hook;
+EXPORT_SYMBOL(br_should_route_hook);
+#endif
git://git.onelab.eu / sliver-openvswitch.git / blobdiff