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netdev: Implement an abstract interface to network devices.

Browse Source 
This new abstraction layer allows multiple implementations of network
devices in a single running process.  This will be useful, for example, to
support network devices that are simulated entirely in the running process
or that communicate with other processes over Unix domain sockets, etc.

The reimplemented tap device support in this commit has not been tested.
This commit is contained in:
Ben Pfaff
2009-07-30 16:04:45 -07:00
parent b1bf7d43b3
commit 8b61709d5e
11 changed files with 2306 additions and 1330 deletions
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60
lib/dpif-linux.c
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@@ -53,6 +53,7 @@ struct dpif_linux {
int local_ifindex; /* Ifindex of local port. */
struct svec changed_ports; /* Ports that have changed. */
struct linux_netdev_notifier port_notifier;
bool change_error;
};
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
@@ -73,18 +74,6 @@ dpif_linux_cast(const struct dpif *dpif)
return CONTAINER_OF(dpif, struct dpif_linux, dpif);
}
static void
dpif_linux_run(void)
{
linux_netdev_notifier_run();
}
static void
dpif_linux_wait(void)
{
linux_netdev_notifier_wait();
}
static int
dpif_linux_enumerate(struct svec *all_dps)
{
@@ -285,26 +274,24 @@ static int
dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
error = linux_netdev_notifier_get_error(&dpif->port_notifier);
if (!error) {
if (!dpif->changed_ports.n) {
return EAGAIN;
}
*devnamep = dpif->changed_ports.names[--dpif->changed_ports.n];
} else {
if (dpif->change_error) {
dpif->change_error = false;
svec_clear(&dpif->changed_ports);
return ENOBUFS;
} else if (dpif->changed_ports.n) {
*devnamep = dpif->changed_ports.names[--dpif->changed_ports.n];
return 0;
} else {
return EAGAIN;
}
return error;
}
static void
dpif_linux_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->changed_ports.n
|| linux_netdev_notifier_peek_error(&dpif->port_notifier)) {
if (dpif->changed_ports.n || dpif->change_error) {
poll_immediate_wake();
} else {
linux_netdev_notifier_wait();
@@ -452,8 +439,8 @@ dpif_linux_recv_wait(struct dpif *dpif_)
const struct dpif_class dpif_linux_class = {
"", /* This is the default class. */
"linux",
dpif_linux_run,
dpif_linux_wait,
NULL,
NULL,
dpif_linux_enumerate,
dpif_linux_open,
dpif_linux_close,
@@ -725,6 +712,7 @@ open_minor(int minor, struct dpif **dpifp)
dpif->minor = minor;
dpif->local_ifindex = 0;
svec_init(&dpif->changed_ports);
dpif->change_error = false;
*dpifp = &dpif->dpif;
} else {
free(dpif);
@@ -743,15 +731,19 @@ dpif_linux_port_changed(const struct linux_netdev_change *change, void *dpif_)
{
struct dpif_linux *dpif = dpif_;
if (change->master_ifindex == dpif->local_ifindex
&& (change->nlmsg_type == RTM_NEWLINK
|| change->nlmsg_type == RTM_DELLINK))
{
/* Our datapath changed, either adding a new port or deleting an
* existing one. */
if (!svec_contains(&dpif->changed_ports, change->ifname)) {
svec_add(&dpif->changed_ports, change->ifname);
svec_sort(&dpif->changed_ports);
if (change) {
if (change->master_ifindex == dpif->local_ifindex
&& (change->nlmsg_type == RTM_NEWLINK
|| change->nlmsg_type == RTM_DELLINK))
{
/* Our datapath changed, either adding a new port or deleting an
* existing one. */
if (!svec_contains(&dpif->changed_ports, change->ifname)) {
svec_add(&dpif->changed_ports, change->ifname);
svec_sort(&dpif->changed_ports);
}
}
} else {
dpif->change_error = true;
}
}