xenserver: Reduce number of xapi DB calls in plugin

[sliver-openvswitch.git] / lib / bond.c

diff --git a/lib/bond.c b/lib/bond.c
index 73ee814..bb5d499 100644 (file)
--- a/lib/bond.c
+++ b/lib/bond.c
@@ -484,14 +484,15 @@ bond_wait(struct bond *bond)
 static bool
 may_send_learning_packets(const struct bond *bond)
 {
-    return !bond->lacp_negotiated && bond->balance != BM_AB;
+    return !bond->lacp_negotiated && bond->balance != BM_AB &&
+           bond->active_slave;
 }
 
 /* Returns true if 'bond' needs the client to send out packets to assist with
  * MAC learning on 'bond'.  If this function returns true, then the client
  * should iterate through its MAC learning table for the bridge on which 'bond'
  * is located.  For each MAC that has been learned on a port other than 'bond',
- * it should call bond_send_learning_packet().
+ * it should call bond_compose_learning_packet().
  *
  * This function will only return true if 'bond' is in SLB mode and LACP is not
  * negotiated.  Otherwise sending learning packets isn't necessary.
@@ -507,37 +508,33 @@ bond_should_send_learning_packets(struct bond *bond)
 
 /* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'.
  *
- * See bond_should_send_learning_packets() for description of usage. */
-int
-bond_send_learning_packet(struct bond *bond,
-                          const uint8_t eth_src[ETH_ADDR_LEN],
-                          uint16_t vlan)
+ * See bond_should_send_learning_packets() for description of usage. The
+ * caller should send the composed packet on the port associated with
+ * port_aux and takes ownership of the returned ofpbuf. */
+struct ofpbuf *
+bond_compose_learning_packet(struct bond *bond,
+                             const uint8_t eth_src[ETH_ADDR_LEN],
+                             uint16_t vlan, void **port_aux)
 {
     struct bond_slave *slave;
-    struct ofpbuf packet;
+    struct ofpbuf *packet;
     struct flow flow;
-    int error;
 
     assert(may_send_learning_packets(bond));
-    if (!bond->active_slave) {
-        /* Nowhere to send the learning packet. */
-        return 0;
-    }
 
     memset(&flow, 0, sizeof flow);
     memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN);
     slave = choose_output_slave(bond, &flow, vlan);
 
-    ofpbuf_init(&packet, 0);
-    compose_benign_packet(&packet, "Open vSwitch Bond Failover", 0xf177,
+    packet = ofpbuf_new(0);
+    compose_benign_packet(packet, "Open vSwitch Bond Failover", 0xf177,
                           eth_src);
     if (vlan) {
-        eth_push_vlan(&packet, htons(vlan));
+        eth_push_vlan(packet, htons(vlan));
     }
-    error = netdev_send(slave->netdev, &packet);
-    ofpbuf_uninit(&packet);
 
-    return error;
+    *port_aux = slave->aux;
+    return packet;
 }
 \f
 /* Checks whether a packet that arrived on 'slave_' within 'bond', with an
@@ -578,9 +575,10 @@ bond_check_admissibility(struct bond *bond, const void *slave_,
         }
     }
 
-    /* Drop all packets which arrive on backup slaves.  This is similar to how
-     * Linux bonding handles active-backup bonds. */
-    if (bond->balance == BM_AB) {
+    switch (bond->balance) {
+    case BM_AB:
+        /* Drop all packets which arrive on backup slaves.  This is similar to
+         * how Linux bonding handles active-backup bonds. */
         *tags |= bond_get_active_slave_tag(bond);
         if (bond->active_slave != slave) {
             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
@@ -590,14 +588,27 @@ bond_check_admissibility(struct bond *bond, const void *slave_,
                         slave->name, ETH_ADDR_ARGS(eth_dst));
             return BV_DROP;
         }
+        return BV_ACCEPT;
+
+    case BM_TCP:
+        /* TCP balancing has degraded to SLB (otherwise the
+         * bond->lacp_negotiated check above would have processed this).
+         *
+         * Fall through. */
+    case BM_SLB:
+        /* Drop all packets for which we have learned a different input port,
+         * because we probably sent the packet on one slave and got it back on
+         * the other.  Gratuitous ARP packets are an exception to this rule:
+         * the host has moved to another switch.  The exception to the
+         * exception is if we locked the learning table to avoid reflections on
+         * bond slaves. */
+        return BV_DROP_IF_MOVED;
+
+    case BM_STABLE:
+        return BV_ACCEPT;
     }
 
-    /* Drop all packets for which we have learned a different input port,
-     * because we probably sent the packet on one slave and got it back on the
-     * other.  Gratuitous ARP packets are an exception to this rule: the host
-     * has moved to another switch.  The exception to the exception is if we
-     * locked the learning table to avoid reflections on bond slaves. */
-    return BV_DROP_IF_MOVED;
+    NOT_REACHED();
 }
 
 /* Returns the slave (registered on 'bond' by bond_slave_register()) to which
@@ -990,11 +1001,7 @@ bond_unixctl_show(struct unixctl_conn *conn,
             ds_put_format(&ds, "\thash %d: %"PRIu64" kB load\n",
                           hash, be->tx_bytes / 1024);
 
-            if (bond->balance != BM_SLB) {
-                continue;
-            }
-
-            /* XXX How can we list the MACs assigned to hashes? */
+            /* XXX How can we list the MACs assigned to hashes of SLB bonds? */
         }
     }
     unixctl_command_reply(conn, 200, ds_cstr(&ds));