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Drivers: hv: vss: full handshake support

Browse source 
Introduce VSS_OP_REGISTER1 to support kernel replying to the negotiation
message with its own version.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Tested-by: Alex Ng <[email protected]>
Signed-off-by: K. Y. Srinivasan <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Vitaly Kuznetsov 2015-04-11 18:07:57 -07:00 • committed by Greg Kroah-Hartman
commit cd8dc05485
3 changed files with 56 additions and 12 deletions
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49
drivers/hv/hv_snapshot.c
View file

@ -59,6 +59,11 @@ static struct {
static void vss_respond_to_host(int error);
/*
* This state maintains the version number registered by the daemon.
*/
static int dm_reg_value;
static const char vss_devname[] = "vmbus/hv_vss";
static __u8 *recv_buffer;
static struct hvutil_transport *hvt;
@ -89,6 +94,29 @@ static void vss_timeout_func(struct work_struct *dummy)
hv_vss_onchannelcallback);
}
static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
{
u32 our_ver = VSS_OP_REGISTER1;
switch (vss_msg->vss_hdr.operation) {
case VSS_OP_REGISTER:
/* Daemon doesn't expect us to reply */
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)))
return -EFAULT;
dm_reg_value = VSS_OP_REGISTER1;
break;
default:
return -EINVAL;
}
vss_transaction.state = HVUTIL_READY;
pr_info("VSS daemon registered\n");
return 0;
}
static int vss_on_msg(void *msg, int len)
{
struct hv_vss_msg *vss_msg = (struct hv_vss_msg *)msg;
@ -96,18 +124,15 @@ static int vss_on_msg(void *msg, int len)
if (len != sizeof(*vss_msg))
return -EINVAL;
/*
* Don't process registration messages if we're in the middle of
* a transaction processing.
*/
if (vss_transaction.state > HVUTIL_READY &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER)
return -EINVAL;
if (vss_transaction.state == HVUTIL_DEVICE_INIT &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER) {
pr_info("VSS daemon registered\n");
vss_transaction.state = HVUTIL_READY;
if (vss_msg->vss_hdr.operation == VSS_OP_REGISTER ||
vss_msg->vss_hdr.operation == VSS_OP_REGISTER1) {
/*
* Don't process registration messages if we're in the middle
* of a transaction processing.
*/
if (vss_transaction.state > HVUTIL_READY)
return -EINVAL;
return vss_handle_handshake(vss_msg);
} else if (vss_transaction.state == HVUTIL_USERSPACE_REQ) {
vss_transaction.state = HVUTIL_USERSPACE_RECV;
if (cancel_delayed_work_sync(&vss_timeout_work)) {