[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v3 4/7] net: introduce lock to protect NetClientStat
From: |
Liu Ping Fan |
Subject: |
[Qemu-devel] [PATCH v3 4/7] net: introduce lock to protect NetClientState's peer's access |
Date: |
Thu, 27 Jun 2013 11:38:46 +0800 |
Introduce nc->peer_lock to shield off the race of nc->peer's reader and
deleter. With it, after deleter finish, no new qemu_send_packet_xx()
will append packet to peer->send_queue, therefore no new reference from
packet->sender to nc will exist in nc->peer->send_queue.
The lock sequence: peer_lock then NetQueue->lock inside.
Signed-off-by: Liu Ping Fan <address@hidden>
---
include/net/net.h | 7 ++++++
net/net.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 67 insertions(+), 4 deletions(-)
diff --git a/include/net/net.h b/include/net/net.h
index 2f72b26..27aa5cb 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -67,6 +67,11 @@ struct NetClientState {
NetClientInfo *info;
int link_down;
QTAILQ_ENTRY(NetClientState) next;
+ /* protect the race access of peer only between reader and writer.
+ * to resolve the writer's race condition, resort on biglock.
+ * Lock sequence: holding peer_lock outside, then NetQueue->lock inside.
+ */
+ QemuMutex peer_lock;
NetClientState *peer;
NetQueue *send_queue;
char *model;
@@ -79,6 +84,7 @@ struct NetClientState {
typedef struct NICState {
NetClientState *ncs;
+ NetClientState **pending_peer;
NICConf *conf;
void *opaque;
bool peer_deleted;
@@ -106,6 +112,7 @@ NetClientState *qemu_find_vlan_client_by_name(Monitor *mon,
int vlan_id,
const char *client_str);
typedef void (*qemu_nic_foreach)(NICState *nic, void *opaque);
void qemu_foreach_nic(qemu_nic_foreach func, void *opaque);
+int qemu_can_send_packet_nolock(NetClientState *sender);
int qemu_can_send_packet(NetClientState *nc);
ssize_t qemu_sendv_packet(NetClientState *nc, const struct iovec *iov,
int iovcnt);
diff --git a/net/net.c b/net/net.c
index 43a74e4..6fc50d8 100644
--- a/net/net.c
+++ b/net/net.c
@@ -204,6 +204,7 @@ static void qemu_net_client_setup(NetClientState *nc,
nc->peer = peer;
peer->peer = nc;
}
+ qemu_mutex_init(&nc->peer_lock);
QTAILQ_INSERT_TAIL(&net_clients, nc, next);
nc->send_queue = qemu_new_net_queue(nc);
@@ -243,6 +244,7 @@ NICState *qemu_new_nic(NetClientInfo *info,
nic->ncs = (void *)nic + info->size;
nic->conf = conf;
nic->opaque = opaque;
+ nic->pending_peer = g_malloc0(sizeof(NetClientState *) * queues);
for (i = 0; i < queues; i++) {
qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
@@ -301,6 +303,35 @@ static void qemu_free_net_client(NetClientState *nc)
}
}
+/* Elimate the reference and sync with exit of rx/tx action.
+ * And flush out peer's queue.
+ */
+static void qemu_net_client_detach_flush(NetClientState *nc)
+{
+ NetClientState *peer;
+
+ qemu_mutex_lock(&nc->peer_lock);
+ peer = nc->peer;
+ qemu_mutex_unlock(&nc->peer_lock);
+
+ /* writer of peer's peer field*/
+ if (peer) {
+ /* exclude the race with tx to @nc */
+ qemu_mutex_lock(&peer->peer_lock);
+ peer->peer = NULL;
+ qemu_mutex_unlock(&peer->peer_lock);
+ }
+
+ /* writer of self's peer field*/
+ /* exclude the race with tx from @nc */
+ qemu_mutex_lock(&nc->peer_lock);
+ nc->peer = NULL;
+ if (peer) {
+ qemu_net_queue_purge(peer->send_queue, nc);
+ }
+ qemu_mutex_unlock(&nc->peer_lock);
+}
+
void qemu_del_net_client(NetClientState *nc)
{
NetClientState *ncs[MAX_QUEUE_NUM];
@@ -331,7 +362,9 @@ void qemu_del_net_client(NetClientState *nc)
}
for (i = 0; i < queues; i++) {
+ qemu_net_client_detach_flush(ncs[i]);
qemu_cleanup_net_client(ncs[i]);
+ nic->pending_peer[i] = ncs[i];
}
return;
@@ -340,6 +373,7 @@ void qemu_del_net_client(NetClientState *nc)
assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
for (i = 0; i < queues; i++) {
+ qemu_net_client_detach_flush(ncs[i]);
qemu_cleanup_net_client(ncs[i]);
qemu_free_net_client(ncs[i]);
}
@@ -352,17 +386,19 @@ void qemu_del_nic(NICState *nic)
/* If this is a peer NIC and peer has already been deleted, free it now. */
if (nic->peer_deleted) {
for (i = 0; i < queues; i++) {
- qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
+ qemu_free_net_client(nic->pending_peer[i]);
}
}
for (i = queues - 1; i >= 0; i--) {
NetClientState *nc = qemu_get_subqueue(nic, i);
+ qemu_net_client_detach_flush(nc);
qemu_cleanup_net_client(nc);
qemu_free_net_client(nc);
}
+ g_free(nic->pending_peer);
g_free(nic);
}
@@ -379,7 +415,7 @@ void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
}
}
-int qemu_can_send_packet(NetClientState *sender)
+int qemu_can_send_packet_nolock(NetClientState *sender)
{
if (!sender->peer) {
return 1;
@@ -394,6 +430,16 @@ int qemu_can_send_packet(NetClientState *sender)
return 1;
}
+int qemu_can_send_packet(NetClientState *sender)
+{
+ int ret = 1;
+
+ qemu_mutex_lock(&sender->peer_lock);
+ qemu_can_send_packet_nolock(sender);
+ qemu_mutex_unlock(&sender->peer_lock);
+ return ret;
+}
+
ssize_t qemu_deliver_packet(NetClientState *sender,
unsigned flags,
const uint8_t *data,
@@ -457,19 +503,24 @@ static ssize_t
qemu_send_packet_async_with_flags(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ ssize_t sz;
#ifdef DEBUG_NET
printf("qemu_send_packet_async:\n");
hex_dump(stdout, buf, size);
#endif
+ qemu_mutex_lock(&sender->peer_lock);
if (sender->link_down || !sender->peer) {
+ qemu_mutex_unlock(&sender->peer_lock);
return size;
}
queue = sender->peer->send_queue;
- return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
+ sz = qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
+ qemu_mutex_unlock(&sender->peer_lock);
+ return sz;
}
ssize_t qemu_send_packet_async(NetClientState *sender,
@@ -537,16 +588,21 @@ ssize_t qemu_sendv_packet_async(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ ssize_t sz;
+ qemu_mutex_lock(&sender->peer_lock);
if (sender->link_down || !sender->peer) {
+ qemu_mutex_unlock(&sender->peer_lock);
return iov_size(iov, iovcnt);
}
queue = sender->peer->send_queue;
- return qemu_net_queue_send_iov(queue, sender,
+ sz = qemu_net_queue_send_iov(queue, sender,
QEMU_NET_PACKET_FLAG_NONE,
iov, iovcnt, sent_cb);
+ qemu_mutex_unlock(&sender->peer_lock);
+ return sz;
}
ssize_t
--
1.8.1.4
- [Qemu-devel] [PATCH v3 0/7] port network layer onto glib, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 1/7] net: force NetQue opaque to be NetClientState, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 2/7] net: distinguish & defer nested call to BH, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 3/7] net: introduce lock to protect NetQueue, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 4/7] net: introduce lock to protect NetClientState's peer's access,
Liu Ping Fan <=
- [Qemu-devel] [PATCH v3 5/7] net: introduce lock to protect net clients, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 6/7] net: using refcnt to manage NetClientState, Liu Ping Fan, 2013/06/26
- [Qemu-devel] [PATCH v3 7/7] net: hub use lock to protect ports list, Liu Ping Fan, 2013/06/26