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-rw-r--r--drivers/hv/hv_fcopy.c14
-rw-r--r--drivers/hv/hv_kvp.c27
-rw-r--r--drivers/hv/hv_snapshot.c16
-rw-r--r--drivers/hv/hv_utils_transport.c15
-rw-r--r--drivers/hv/hv_utils_transport.h4
5 files changed, 54 insertions, 22 deletions
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index 23c70799ad8a..8b2ba98831ec 100644
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -83,6 +83,12 @@ static void fcopy_timeout_func(struct work_struct *dummy)
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
}
+static void fcopy_register_done(void)
+{
+ pr_debug("FCP: userspace daemon registered\n");
+ hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
+}
+
static int fcopy_handle_handshake(u32 version)
{
u32 our_ver = FCOPY_CURRENT_VERSION;
@@ -94,7 +100,8 @@ static int fcopy_handle_handshake(u32 version)
break;
case FCOPY_VERSION_1:
/* Daemon expects us to reply with our own version */
- if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
+ if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
+ fcopy_register_done))
return -EFAULT;
dm_reg_value = version;
break;
@@ -107,8 +114,7 @@ static int fcopy_handle_handshake(u32 version)
*/
return -EINVAL;
}
- pr_debug("FCP: userspace daemon ver. %d registered\n", version);
- hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
+ pr_debug("FCP: userspace daemon ver. %d connected\n", version);
return 0;
}
@@ -161,7 +167,7 @@ static void fcopy_send_data(struct work_struct *dummy)
}
fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
- rc = hvutil_transport_send(hvt, out_src, out_len);
+ rc = hvutil_transport_send(hvt, out_src, out_len, NULL);
if (rc) {
pr_debug("FCP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index cb1a9160aab1..5e1fdc8d32ab 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -102,6 +102,17 @@ static void kvp_poll_wrapper(void *channel)
hv_kvp_onchannelcallback(channel);
}
+static void kvp_register_done(void)
+{
+ /*
+ * If we're still negotiating with the host cancel the timeout
+ * work to not poll the channel twice.
+ */
+ pr_debug("KVP: userspace daemon registered\n");
+ cancel_delayed_work_sync(&kvp_host_handshake_work);
+ hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
+}
+
static void
kvp_register(int reg_value)
{
@@ -116,7 +127,8 @@ kvp_register(int reg_value)
kvp_msg->kvp_hdr.operation = reg_value;
strcpy(version, HV_DRV_VERSION);
- hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg));
+ hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg),
+ kvp_register_done);
kfree(kvp_msg);
}
}
@@ -158,17 +170,10 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
/*
* We have a compatible daemon; complete the handshake.
*/
- pr_debug("KVP: userspace daemon ver. %d registered\n",
- KVP_OP_REGISTER);
+ pr_debug("KVP: userspace daemon ver. %d connected\n",
+ msg->kvp_hdr.operation);
kvp_register(dm_reg_value);
- /*
- * If we're still negotiating with the host cancel the timeout
- * work to not poll the channel twice.
- */
- cancel_delayed_work_sync(&kvp_host_handshake_work);
- hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
-
return 0;
}
@@ -455,7 +460,7 @@ kvp_send_key(struct work_struct *dummy)
}
kvp_transaction.state = HVUTIL_USERSPACE_REQ;
- rc = hvutil_transport_send(hvt, message, sizeof(*message));
+ rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL);
if (rc) {
pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 3fba14e88f03..fde45865579a 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -95,6 +95,12 @@ static void vss_timeout_func(struct work_struct *dummy)
hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
}
+static void vss_register_done(void)
+{
+ hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
+ pr_debug("VSS: userspace daemon registered\n");
+}
+
static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
{
u32 our_ver = VSS_OP_REGISTER1;
@@ -105,16 +111,16 @@ static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
dm_reg_value = VSS_OP_REGISTER;
break;
case VSS_OP_REGISTER1:
- /* Daemon expects us to reply with our own version*/
- if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
+ /* Daemon expects us to reply with our own version */
+ if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
+ vss_register_done))
return -EFAULT;
dm_reg_value = VSS_OP_REGISTER1;
break;
default:
return -EINVAL;
}
- hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
- pr_debug("VSS: userspace daemon ver. %d registered\n", dm_reg_value);
+ pr_debug("VSS: userspace daemon ver. %d connected\n", dm_reg_value);
return 0;
}
@@ -168,7 +174,7 @@ static void vss_send_op(struct work_struct *dummy)
vss_msg->vss_hdr.operation = op;
vss_transaction.state = HVUTIL_USERSPACE_REQ;
- rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg));
+ rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg), NULL);
if (rc) {
pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&vss_timeout_work)) {
diff --git a/drivers/hv/hv_utils_transport.c b/drivers/hv/hv_utils_transport.c
index 9a9983fa4531..c235a9515267 100644
--- a/drivers/hv/hv_utils_transport.c
+++ b/drivers/hv/hv_utils_transport.c
@@ -72,6 +72,10 @@ static ssize_t hvt_op_read(struct file *file, char __user *buf,
hvt->outmsg = NULL;
hvt->outmsg_len = 0;
+ if (hvt->on_read)
+ hvt->on_read();
+ hvt->on_read = NULL;
+
out_unlock:
mutex_unlock(&hvt->lock);
return ret;
@@ -219,7 +223,8 @@ static void hvt_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
mutex_unlock(&hvt->lock);
}
-int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
+int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
+ void (*on_read_cb)(void))
{
struct cn_msg *cn_msg;
int ret = 0;
@@ -237,6 +242,13 @@ int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
memcpy(cn_msg->data, msg, len);
ret = cn_netlink_send(cn_msg, 0, 0, GFP_ATOMIC);
kfree(cn_msg);
+ /*
+ * We don't know when netlink messages are delivered but unlike
+ * in CHARDEV mode we're not blocked and we can send next
+ * messages right away.
+ */
+ if (on_read_cb)
+ on_read_cb();
return ret;
}
/* HVUTIL_TRANSPORT_CHARDEV */
@@ -255,6 +267,7 @@ int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
if (hvt->outmsg) {
memcpy(hvt->outmsg, msg, len);
hvt->outmsg_len = len;
+ hvt->on_read = on_read_cb;
wake_up_interruptible(&hvt->outmsg_q);
} else
ret = -ENOMEM;
diff --git a/drivers/hv/hv_utils_transport.h b/drivers/hv/hv_utils_transport.h
index 06254a165a18..d98f5225c3e6 100644
--- a/drivers/hv/hv_utils_transport.h
+++ b/drivers/hv/hv_utils_transport.h
@@ -36,6 +36,7 @@ struct hvutil_transport {
struct list_head list; /* hvt_list */
int (*on_msg)(void *, int); /* callback on new user message */
void (*on_reset)(void); /* callback when userspace drops */
+ void (*on_read)(void); /* callback on message read */
u8 *outmsg; /* message to the userspace */
int outmsg_len; /* its length */
wait_queue_head_t outmsg_q; /* poll/read wait queue */
@@ -46,7 +47,8 @@ struct hvutil_transport *hvutil_transport_init(const char *name,
u32 cn_idx, u32 cn_val,
int (*on_msg)(void *, int),
void (*on_reset)(void));
-int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len);
+int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
+ void (*on_read_cb)(void));
void hvutil_transport_destroy(struct hvutil_transport *hvt);
#endif /* _HV_UTILS_TRANSPORT_H */
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