X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Frconn.c;h=7d0f4ce65ceb8d01d00d10192f8154ddb73ec898;hb=dbba996be2f0d96f4d2999d51c4ef1d16809bad9;hp=06f36264ed51a4954437c677d1c7cf6bce2f6a34;hpb=d295e8e97acae13552a5b220d3fbcff8201064a2;p=sliver-openvswitch.git

diff --git a/lib/rconn.c b/lib/rconn.c
index 06f36264e..7d0f4ce65 100644
--- a/lib/rconn.c
+++ b/lib/rconn.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,12 @@
 #include "vconn.h"
 #include "vlog.h"
 
-VLOG_DEFINE_THIS_MODULE(rconn)
+VLOG_DEFINE_THIS_MODULE(rconn);
+
+COVERAGE_DEFINE(rconn_discarded);
+COVERAGE_DEFINE(rconn_overflow);
+COVERAGE_DEFINE(rconn_queued);
+COVERAGE_DEFINE(rconn_sent);
 
 #define STATES                                  \
     STATE(VOID, 1 << 0)                         \
@@ -69,13 +74,14 @@ struct rconn {
     char *target;               /* vconn name, passed to vconn_open(). */
     bool reliable;
 
-    struct ovs_queue txq;
+    struct list txq;            /* Contains "struct ofpbuf"s. */
 
     int backoff;
     int max_backoff;
     time_t backoff_deadline;
     time_t last_received;
     time_t last_connected;
+    time_t last_disconnected;
     unsigned int packets_sent;
     unsigned int seqno;
     int last_error;
@@ -98,16 +104,6 @@ struct rconn {
     time_t creation_time;
     unsigned long int total_time_connected;
 
-    /* If we can't connect to the peer, it could be for any number of reasons.
-     * Usually, one would assume it is because the peer is not running or
-     * because the network is partitioned.  But it could also be because the
-     * network topology has changed, in which case the upper layer will need to
-     * reassess it (in particular, obtain a new IP address via DHCP and find
-     * the new location of the controller).  We set this flag when we suspect
-     * that this could be the case. */
-    bool questionable_connectivity;
-    time_t last_questioned;
-
     /* Throughout this file, "probe" is shorthand for "inactivity probe".
      * When nothing has been received from the peer for a while, we send out
      * an echo request as an inactivity probe packet.  We should receive back
@@ -143,7 +139,6 @@ static void reconnect(struct rconn *);
 static void report_error(struct rconn *, int error);
 static void disconnect(struct rconn *, int error);
 static void flush_queue(struct rconn *);
-static void question_connectivity(struct rconn *);
 static void copy_to_monitor(struct rconn *, const struct ofpbuf *);
 static bool is_connected_state(enum state);
 static bool is_admitted_msg(const struct ofpbuf *);
@@ -177,13 +172,14 @@ rconn_create(int probe_interval, int max_backoff)
     rc->target = xstrdup("void");
     rc->reliable = false;
 
-    queue_init(&rc->txq);
+    list_init(&rc->txq);
 
     rc->backoff = 0;
     rc->max_backoff = max_backoff ? max_backoff : 8;
     rc->backoff_deadline = TIME_MIN;
     rc->last_received = time_now();
-    rc->last_connected = time_now();
+    rc->last_connected = TIME_MIN;
+    rc->last_disconnected = TIME_MIN;
     rc->seqno = 0;
 
     rc->packets_sent = 0;
@@ -197,9 +193,6 @@ rconn_create(int probe_interval, int max_backoff)
     rc->creation_time = time_now();
     rc->total_time_connected = 0;
 
-    rc->questionable_connectivity = false;
-    rc->last_questioned = time_now();
-
     rconn_set_probe_interval(rc, probe_interval);
 
     rc->n_monitors = 0;
@@ -313,7 +306,7 @@ rconn_destroy(struct rconn *rc)
         free(rc->target);
         vconn_close(rc->vconn);
         flush_queue(rc);
-        queue_destroy(&rc->txq);
+        ofpbuf_list_delete(&rc->txq);
         for (i = 0; i < rc->n_monitors; i++) {
             vconn_close(rc->monitors[i]);
         }
@@ -403,16 +396,16 @@ run_CONNECTING(struct rconn *rc)
 static void
 do_tx_work(struct rconn *rc)
 {
-    if (!rc->txq.n) {
+    if (list_is_empty(&rc->txq)) {
         return;
     }
-    while (rc->txq.n > 0) {
+    while (!list_is_empty(&rc->txq)) {
         int error = try_send(rc);
         if (error) {
             break;
         }
     }
-    if (!rc->txq.n) {
+    if (list_is_empty(&rc->txq)) {
         poll_immediate_wake();
     }
 }
@@ -457,7 +450,6 @@ static void
 run_IDLE(struct rconn *rc)
 {
     if (timed_out(rc)) {
-        question_connectivity(rc);
         VLOG_ERR("%s: no response to inactivity probe after %u "
                  "seconds, disconnecting",
                  rc->name, elapsed_in_this_state(rc));
@@ -505,6 +497,9 @@ rconn_run_wait(struct rconn *rc)
 
     if (rc->vconn) {
         vconn_run_wait(rc->vconn);
+        if ((rc->state & (S_ACTIVE | S_IDLE)) && !list_is_empty(&rc->txq)) {
+            vconn_wait(rc->vconn, WAIT_SEND);
+        }
     }
     for (i = 0; i < rc->n_monitors; i++) {
         vconn_run_wait(rc->monitors[i]);
@@ -515,10 +510,6 @@ rconn_run_wait(struct rconn *rc)
         long long int expires = sat_add(rc->state_entered, timeo);
         poll_timer_wait_until(expires * 1000);
     }
-
-    if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
-        vconn_wait(rc->vconn, WAIT_SEND);
-    }
 }
 
 /* Attempts to receive a packet from 'rc'.  If successful, returns the packet;
@@ -585,13 +576,13 @@ rconn_send(struct rconn *rc, struct ofpbuf *b,
         if (counter) {
             rconn_packet_counter_inc(counter);
         }
-        queue_push_tail(&rc->txq, b);
+        list_push_back(&rc->txq, &b->list_node);
 
         /* If the queue was empty before we added 'b', try to send some
          * packets.  (But if the queue had packets in it, it's because the
          * vconn is backlogged and there's no point in stuffing more into it
          * now.  We'll get back to that in rconn_run().) */
-        if (rc->txq.n == 1) {
+        if (rc->txq.next == &b->list_node) {
             try_send(rc);
         }
         return 0;
@@ -709,7 +700,7 @@ rconn_failure_duration(const struct rconn *rconn)
 
 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
  * known. */
-uint32_t
+ovs_be32
 rconn_get_remote_ip(const struct rconn *rconn)
 {
     return rconn->remote_ip;
@@ -717,7 +708,7 @@ rconn_get_remote_ip(const struct rconn *rconn)
 
 /* Returns the transport port of the peer, or 0 if the peer's port is not
  * known. */
-uint16_t
+ovs_be16
 rconn_get_remote_port(const struct rconn *rconn)
 {
     return rconn->remote_port;
@@ -726,7 +717,7 @@ rconn_get_remote_port(const struct rconn *rconn)
 /* Returns the IP address used to connect to the peer, or 0 if the
  * connection is not an IP-based protocol or if its IP address is not
  * known. */
-uint32_t
+ovs_be32
 rconn_get_local_ip(const struct rconn *rconn)
 {
     return rconn->local_ip;
@@ -734,28 +725,12 @@ rconn_get_local_ip(const struct rconn *rconn)
 
 /* Returns the transport port used to connect to the peer, or 0 if the
  * connection does not contain a port or if the port is not known. */
-uint16_t
+ovs_be16
 rconn_get_local_port(const struct rconn *rconn)
 {
     return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
 }
 
-/* If 'rconn' can't connect to the peer, it could be for any number of reasons.
- * Usually, one would assume it is because the peer is not running or because
- * the network is partitioned.  But it could also be because the network
- * topology has changed, in which case the upper layer will need to reassess it
- * (in particular, obtain a new IP address via DHCP and find the new location
- * of the controller).  When this appears that this might be the case, this
- * function returns true.  It also clears the questionability flag and prevents
- * it from being set again for some time. */
-bool
-rconn_is_connectivity_questionable(struct rconn *rconn)
-{
-    bool questionable = rconn->questionable_connectivity;
-    rconn->questionable_connectivity = false;
-    return questionable;
-}
-
 /* Returns the total number of packets successfully received by the underlying
  * vconn.  */
 unsigned int
@@ -788,13 +763,21 @@ rconn_get_successful_connections(const struct rconn *rc)
 }
 
 /* Returns the time at which the last successful connection was made by
- * 'rc'. */
+ * 'rc'. Returns TIME_MIN if never connected. */
 time_t
 rconn_get_last_connection(const struct rconn *rc)
 {
     return rc->last_connected;
 }
 
+/* Returns the time at which 'rc' was last disconnected. Returns TIME_MIN
+ * if never disconnected. */
+time_t
+rconn_get_last_disconnect(const struct rconn *rc)
+{
+    return rc->last_disconnected;
+}
+
 /* Returns the time at which the last OpenFlow message was received by 'rc'.
  * If no packets have been received on 'rc', returns the time at which 'rc'
  * was created. */
@@ -915,11 +898,18 @@ rconn_set_target__(struct rconn *rc, const char *target, const char *name)
 static int
 try_send(struct rconn *rc)
 {
-    int retval = 0;
-    struct ofpbuf *next = rc->txq.head->next;
-    struct rconn_packet_counter *counter = rc->txq.head->private_p;
-    retval = vconn_send(rc->vconn, rc->txq.head);
+    struct ofpbuf *msg = ofpbuf_from_list(rc->txq.next);
+    struct rconn_packet_counter *counter = msg->private_p;
+    int retval;
+
+    /* Eagerly remove 'msg' from the txq.  We can't remove it from the list
+     * after sending, if sending is successful, because it is then owned by the
+     * vconn, which might have freed it already. */
+    list_remove(&msg->list_node);
+
+    retval = vconn_send(rc->vconn, msg);
     if (retval) {
+        list_push_front(&rc->txq, &msg->list_node);
         if (retval != EAGAIN) {
             report_error(rc, retval);
             disconnect(rc, retval);
@@ -931,7 +921,6 @@ try_send(struct rconn *rc)
     if (counter) {
         rconn_packet_counter_dec(counter);
     }
-    queue_advance_head(&rc->txq, next);
     return 0;
 }
 
@@ -970,6 +959,7 @@ disconnect(struct rconn *rc, int error)
         time_t now = time_now();
 
         if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
+            rc->last_disconnected = now;
             vconn_close(rc->vconn);
             rc->vconn = NULL;
             flush_queue(rc);
@@ -991,10 +981,8 @@ disconnect(struct rconn *rc, int error)
         }
         rc->backoff_deadline = now + rc->backoff;
         state_transition(rc, S_BACKOFF);
-        if (now - rc->last_connected > 60) {
-            question_connectivity(rc);
-        }
     } else {
+        rc->last_disconnected = time_now();
         rconn_disconnect(rc);
     }
 }
@@ -1004,11 +992,11 @@ disconnect(struct rconn *rc, int error)
 static void
 flush_queue(struct rconn *rc)
 {
-    if (!rc->txq.n) {
+    if (list_is_empty(&rc->txq)) {
         return;
     }
-    while (rc->txq.n > 0) {
-        struct ofpbuf *b = queue_pop_head(&rc->txq);
+    while (!list_is_empty(&rc->txq)) {
+        struct ofpbuf *b = ofpbuf_from_list(list_pop_front(&rc->txq));
         struct rconn_packet_counter *counter = b->private_p;
         if (counter) {
             rconn_packet_counter_dec(counter);
@@ -1058,16 +1046,6 @@ state_transition(struct rconn *rc, enum state state)
     rc->state_entered = time_now();
 }
 
-static void
-question_connectivity(struct rconn *rc)
-{
-    time_t now = time_now();
-    if (now - rc->last_questioned > 60) {
-        rc->questionable_connectivity = true;
-        rc->last_questioned = now;
-    }
-}
-
 static void
 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
 {