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colo-compare: track connection and enqueue packet

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In this patch we use kernel jhash table to track
connection, and then enqueue net packet like this:

+ CompareState ++
|               |
+---------------+   +---------------+         +---------------+
|conn list      +--->conn           +--------->conn           |
+---------------+   +---------------+         +---------------+
|               |     |           |             |          |
+---------------+ +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+
                      |           |             |          |
                  +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+
                      |           |             |          |
                  +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+

We use conn_list to record connection info.
When we want to enqueue a packet, firstly get the
connection from connection_track_table. then push
the packet to g_queue(pri/sec) in it's own conn.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Zhang Chen 2016-09-27 10:22:29 +08:00 • committed by Jason Wang
parent ccf0426c09
commit b6540d403d
3 changed files with 190 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

53
net/colo-compare.c
View file

@ -33,6 +33,8 @@
#define COLO_COMPARE(obj) \
OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE)
#define MAX_QUEUE_SIZE 1024
/*
+ CompareState ++
| |
@ -67,6 +69,11 @@ typedef struct CompareState {
SocketReadState pri_rs;
SocketReadState sec_rs;
/* connection list: the connections belonged to this NIC could be found
* in this list.
* element type: Connection
*/
GQueue conn_list;
/* hashtable to save connection */
GHashTable *connection_track_table;
} CompareState;
@ -94,7 +101,9 @@ static int compare_chr_send(CharDriverState *out,
*/
static int packet_enqueue(CompareState *s, int mode)
{
ConnectionKey key;
Packet *pkt = NULL;
Connection *conn;
if (mode == PRIMARY_IN) {
pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len);
@ -107,17 +116,34 @@ static int packet_enqueue(CompareState *s, int mode)
pkt = NULL;
return -1;
}
/* TODO: get connection key from pkt */
fill_connection_key(pkt, &key);
/*
* TODO: use connection key get conn from
* connection_track_table
*/
conn = connection_get(s->connection_track_table,
&key,
&s->conn_list);
/*
* TODO: insert pkt to it's conn->primary_list
* or conn->secondary_list
*/
if (!conn->processing) {
g_queue_push_tail(&s->conn_list, conn);
conn->processing = true;
}
if (mode == PRIMARY_IN) {
if (g_queue_get_length(&conn->primary_list) <=
MAX_QUEUE_SIZE) {
g_queue_push_tail(&conn->primary_list, pkt);
} else {
error_report("colo compare primary queue size too big,"
"drop packet");
}
} else {
if (g_queue_get_length(&conn->secondary_list) <=
MAX_QUEUE_SIZE) {
g_queue_push_tail(&conn->secondary_list, pkt);
} else {
error_report("colo compare secondary queue size too big,"
"drop packet");
}
}
return 0;
}
@ -308,7 +334,12 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp)
net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize);
net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize);
/* use g_hash_table_new_full() to new a hashtable */
g_queue_init(&s->conn_list);
s->connection_track_table = g_hash_table_new_full(connection_key_hash,
connection_key_equal,
g_free,
connection_destroy);
return;
}
@ -349,6 +380,8 @@ static void colo_compare_finalize(Object *obj)
qemu_chr_fe_release(s->chr_out);
}
g_queue_free(&s->conn_list);
g_free(s->pri_indev);
g_free(s->sec_indev);
g_free(s->outdev);