Feature #21293.
Requested-by: Anuprem Chalvadi <[email protected]>
Signed-off-by: Ben Pfaff <[email protected]>
---
NEWS | 3 ++
vswitchd/bridge.c | 93 ++++++++++++++++++++++++++++++++++++++++++++------
vswitchd/vswitch.xml | 21 +++++++-----
3 files changed, 99 insertions(+), 18 deletions(-)
diff --git a/NEWS b/NEWS
index 8556083..ce968f2 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,9 @@ Post-v2.0.0
* OVS limits the OpenFlow port numbers it assigns to port 32767 and
below, leaving port numbers above that range free for assignment
by the controller.
+ * ovs-vswitchd now honors changes to the "ofport_request" column
+ in the Interface table by changing the port's OpenFlow port
+ number.
- ovs-vswitchd.conf.db.5 man page will contain graphviz/dot
diagram only if graphviz package was installed at the build time.
- Support for Linux kernels up to 3.11
diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index 581f87c..131b800 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -75,6 +75,7 @@ struct iface {
char *name; /* Host network device name. */
struct netdev *netdev; /* Network device. */
ofp_port_t ofp_port; /* OpenFlow port number. */
+ ofp_port_t requested_ofp_port; /* Port number requested previously. */
/* These members are valid only within bridge_reconfigure(). */
const char *type; /* Usually same as cfg->type. */
@@ -247,6 +248,8 @@ static void iface_refresh_cfm_stats(struct iface *);
static void iface_refresh_stats(struct iface *);
static void iface_refresh_status(struct iface *);
static bool iface_is_synthetic(const struct iface *);
+static ofp_port_t iface_get_requested_ofp_port(
+ const struct ovsrec_interface *);
static ofp_port_t iface_pick_ofport(const struct ovsrec_interface *);
/* Linux VLAN device support (e.g. "eth0.10" for VLAN 10.)
@@ -636,6 +639,7 @@ bridge_delete_ports(struct bridge *br)
n = allocated = 0;
OFPROTO_PORT_FOR_EACH (&ofproto_port, &dump, br->ofproto) {
+ ofp_port_t requested_ofp_port;
struct iface *iface;
iface = iface_lookup(br, ofproto_port.name);
@@ -657,6 +661,43 @@ bridge_delete_ports(struct bridge *br)
goto delete;
}
+ /* If the requested OpenFlow port for 'iface' changed, and it's not
+ * already the correct port, then we might want to temporarily delete
+ * this interface, so we can add it back again with the new OpenFlow
+ * port number. */
+ requested_ofp_port = iface_get_requested_ofp_port(iface->cfg);
+ if (requested_ofp_port != iface->requested_ofp_port &&
+ requested_ofp_port != OFPP_NONE &&
+ requested_ofp_port != iface->ofp_port) {
+ ofp_port_t victim_request;
+ struct iface *victim;
+
+ /* Check for an existing OpenFlow port currently occupying
+ * 'iface''s requested port number. If there isn't one, then
+ * delete this port. Otherwise we need to consider further. */
+ victim = iface_from_ofp_port(br, requested_ofp_port);
+ if (!victim) {
+ goto delete;
+ }
+
+ /* 'victim' is a port currently using 'iface''s requested port
+ * number. Unless 'victim' specifically requested that port
+ * number, too, then we can delete both 'iface' and 'victim'
+ * temporarily. (We'll add both of them back again later with new
+ * OpenFlow port numbers.)
+ *
+ * If 'victim' did request port number 'requested_ofp_port', just
+ * like 'iface', then that's a configuration inconsistency that we
+ * can't resolve. We might as well let it keep its current port
+ * number. */
+ victim_request = iface_get_requested_ofp_port(victim->cfg);
+ if (victim_request != requested_ofp_port) {
+ del = add_ofp_port(victim->ofp_port, del, &n, &allocated);
+ iface_destroy(victim);
+ goto delete;
+ }
+ }
+
continue;
delete:
@@ -671,7 +712,8 @@ bridge_delete_ports(struct bridge *br)
}
static void
-bridge_add_ports(struct bridge *br, const struct shash *wanted_ports)
+bridge_add_ports__(struct bridge *br, const struct shash *wanted_ports,
+ bool with_requested_port)
{
struct shash_node *port_node;
@@ -681,16 +723,33 @@ bridge_add_ports(struct bridge *br, const struct shash
*wanted_ports)
for (i = 0; i < port_cfg->n_interfaces; i++) {
const struct ovsrec_interface *iface_cfg = port_cfg->interfaces[i];
- struct iface *iface = iface_lookup(br, iface_cfg->name);
+ ofp_port_t requested_ofp_port;
+
+ requested_ofp_port = iface_get_requested_ofp_port(iface_cfg);
+ if ((requested_ofp_port != OFPP_NONE) == with_requested_port) {
+ struct iface *iface = iface_lookup(br, iface_cfg->name);
- if (!iface) {
- iface_create(br, iface_cfg, port_cfg);
+ if (!iface) {
+ iface_create(br, iface_cfg, port_cfg);
+ }
}
}
}
}
static void
+bridge_add_ports(struct bridge *br, const struct shash *wanted_ports)
+{
+ /* First add interfaces that request a particular port number. */
+ bridge_add_ports__(br, wanted_ports, true);
+
+ /* Then add interfaces that want automatic port number assignment.
+ * We add these afterward to avoid accidentally taking a specifically
+ * requested port number. */
+ bridge_add_ports__(br, wanted_ports, false);
+}
+
+static void
port_configure(struct port *port)
{
const struct ovsrec_port *cfg = port->cfg;
@@ -1416,6 +1475,7 @@ iface_create(struct bridge *br, const struct
ovsrec_interface *iface_cfg,
iface->port = port;
iface->name = xstrdup(iface_cfg->name);
iface->ofp_port = ofp_port;
+ iface->requested_ofp_port = iface_get_requested_ofp_port(iface_cfg);
iface->netdev = netdev;
iface->type = iface_get_type(iface_cfg, br->cfg);
iface->cfg = iface_cfg;
@@ -1439,7 +1499,7 @@ iface_create(struct bridge *br, const struct
ovsrec_interface *iface_cfg,
error = netdev_open(port->name, "internal", &netdev);
if (!error) {
- ofp_port_t fake_ofp_port = iface_pick_ofport(iface_cfg);
+ ofp_port_t fake_ofp_port = OFPP_NONE;
ofproto_port_add(br->ofproto, netdev, &fake_ofp_port);
netdev_close(netdev);
} else {
@@ -3566,14 +3626,27 @@ iface_is_synthetic(const struct iface *iface)
}
static ofp_port_t
-iface_pick_ofport(const struct ovsrec_interface *cfg)
+iface_validate_ofport__(size_t n, int64_t *ofport)
+{
+ return (n && *ofport >= 1 && *ofport < OFPP_MAX
+ ? u16_to_ofp(*ofport)
+ : OFPP_NONE);
+}
+
+static ofp_port_t
+iface_get_requested_ofp_port(const struct ovsrec_interface *cfg)
{
- ofp_port_t ofport = cfg->n_ofport ? u16_to_ofp(*cfg->ofport)
- : OFPP_NONE;
- return cfg->n_ofport_request ? u16_to_ofp(*cfg->ofport_request)
- : ofport;
+ return iface_validate_ofport__(cfg->n_ofport_request, cfg->ofport_request);
}
+static ofp_port_t
+iface_pick_ofport(const struct ovsrec_interface *cfg)
+{
+ ofp_port_t requested_ofport = iface_get_requested_ofp_port(cfg);
+ return (requested_ofport != OFPP_NONE
+ ? requested_ofport
+ : iface_validate_ofport__(cfg->n_ofport, cfg->ofport));
+}
/* Port mirroring. */
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index f6a8db1..f21bc8a 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1306,14 +1306,19 @@
</p>
<p>
- Open vSwitch currently assigns the OpenFlow port number for an
- interface once, when the client first adds the interface. It does
- not change the port number later if the client sets or changes or
- clears <ref column="ofport_request"/>. Therefore, to ensure that
- <ref column="ofport_request"/> takes effect, the client should set
- it in the same database transaction that creates the interface.
- (Future versions of Open vSwitch might honor changes to <ref
- column="ofport_request"/>.)
+ A client should ideally set this column's value in the same
+ database transaction that it uses to create the interface. Open
+ vSwitch version 2.1 and later will honor a later request for a
+ specific port number, althuogh it might confuse some controllers:
+ OpenFlow does not have a way to announce a port number change, so
+ Open vSwitch represents it over OpenFlow as a port deletion
+ followed immediately by a port addition.
+ </p>
+
+ <p>
+ If <ref column="ofport_request"/> is set or changed to some other
+ port's automatically assigned port number, Open vSwitch chooses a
+ new port number for the latter port.
</p>
</column>
</group>
--
1.7.10.4
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