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Drivers: hv: kvp: convert to hv_utils_transport

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Convert to hv_utils_transport to support both netlink and /dev/vmbus/hv_kvp communication methods.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2015-04-11 18:07:54 -07:00 committed by Greg Kroah-Hartman
parent c7e490fc23
commit 11bc3a5fa9
1 changed files with 42 additions and 49 deletions
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91
drivers/hv/hv_kvp.c
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@ -29,6 +29,7 @@
#include <linux/hyperv.h>
#include "hyperv_vmbus.h"
#include "hv_utils_transport.h"
/*
* Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
@ -83,9 +84,9 @@ static void kvp_register(int);
static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func);
static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL };
static const char kvp_name[] = "kvp_kernel_module";
static const char kvp_devname[] = "vmbus/hv_kvp";
static u8 *recv_buffer;
static struct hvutil_transport *hvt;
/*
* Register the kernel component with the user-level daemon.
* As part of this registration, pass the LIC version number.
@ -97,23 +98,18 @@ static void
kvp_register(int reg_value)
{
struct cn_msg *msg;
struct hv_kvp_msg *kvp_msg;
char *version;
msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg), GFP_ATOMIC);
kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL);
if (msg) {
kvp_msg = (struct hv_kvp_msg *)msg->data;
if (kvp_msg) {
version = kvp_msg->body.kvp_register.version;
msg->id.idx = CN_KVP_IDX;
msg->id.val = CN_KVP_VAL;
kvp_msg->kvp_hdr.operation = reg_value;
strcpy(version, HV_DRV_VERSION);
msg->len = sizeof(struct hv_kvp_msg);
cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
kfree(msg);
hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg));
kfree(kvp_msg);
}
}
@ -135,8 +131,6 @@ static void kvp_timeout_func(struct work_struct *dummy)
static int kvp_handle_handshake(struct hv_kvp_msg *msg)
{
int ret = 1;
switch (msg->kvp_hdr.operation) {
case KVP_OP_REGISTER:
dm_reg_value = KVP_OP_REGISTER;
@ -150,18 +144,17 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
pr_info("KVP: incompatible daemon\n");
pr_info("KVP: KVP version: %d, Daemon version: %d\n",
KVP_OP_REGISTER1, msg->kvp_hdr.operation);
ret = 0;
return -EINVAL;
}
if (ret) {
/*
* We have a compatible daemon; complete the handshake.
*/
pr_info("KVP: user-mode registering done.\n");
kvp_register(dm_reg_value);
kvp_transaction.state = HVUTIL_READY;
}
return ret;
/*
* We have a compatible daemon; complete the handshake.
*/
pr_info("KVP: user-mode registering done.\n");
kvp_register(dm_reg_value);
kvp_transaction.state = HVUTIL_READY;
return 0;
}
@ -169,14 +162,14 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
* Callback when data is received from user mode.
*/
static void
kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
static int kvp_on_msg(void *msg, int len)
{
struct hv_kvp_msg *message;
struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg;
struct hv_kvp_msg_enumerate *data;
int error = 0;
message = (struct hv_kvp_msg *)msg->data;
if (len < sizeof(*message))
return -EINVAL;
/*
* If we are negotiating the version information
@ -184,13 +177,13 @@ kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
*/
if (kvp_transaction.state < HVUTIL_READY) {
kvp_handle_handshake(message);
return;
return kvp_handle_handshake(message);
}
/* We didn't send anything to userspace so the reply is spurious */
if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
return;
return -EINVAL;
kvp_transaction.state = HVUTIL_USERSPACE_RECV;
/*
@ -228,6 +221,8 @@ kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
hv_poll_channel(kvp_transaction.kvp_context,
hv_kvp_onchannelcallback);
}
return 0;
}
@ -344,7 +339,6 @@ static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
static void
kvp_send_key(struct work_struct *dummy)
{
struct cn_msg *msg;
struct hv_kvp_msg *message;
struct hv_kvp_msg *in_msg;
__u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
@ -357,14 +351,7 @@ kvp_send_key(struct work_struct *dummy)
if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
return;
msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
if (!msg)
return;
msg->id.idx = CN_KVP_IDX;
msg->id.val = CN_KVP_VAL;
message = (struct hv_kvp_msg *)msg->data;
message = kzalloc(sizeof(*message), GFP_KERNEL);
message->kvp_hdr.operation = operation;
message->kvp_hdr.pool = pool;
in_msg = kvp_transaction.kvp_msg;
@ -451,9 +438,8 @@ kvp_send_key(struct work_struct *dummy)
break;
}
msg->len = sizeof(struct hv_kvp_msg);
kvp_transaction.state = HVUTIL_USERSPACE_REQ;
rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
rc = hvutil_transport_send(hvt, message, sizeof(*message));
if (rc) {
pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
@ -462,7 +448,7 @@ kvp_send_key(struct work_struct *dummy)
}
}
kfree(msg);
kfree(message);
return;
}
@ -694,14 +680,16 @@ void hv_kvp_onchannelcallback(void *context)
}
static void kvp_on_reset(void)
{
if (cancel_delayed_work_sync(&kvp_timeout_work))
kvp_respond_to_host(NULL, HV_E_FAIL);
kvp_transaction.state = HVUTIL_DEVICE_INIT;
}
int
hv_kvp_init(struct hv_util_service *srv)
{
int err;
err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
if (err)
return err;
recv_buffer = srv->recv_buffer;
/*
@ -712,13 +700,18 @@ hv_kvp_init(struct hv_util_service *srv)
*/
kvp_transaction.state = HVUTIL_DEVICE_INIT;
hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL,
kvp_on_msg, kvp_on_reset);
if (!hvt)
return -EFAULT;
return 0;
}
void hv_kvp_deinit(void)
{
kvp_transaction.state = HVUTIL_DEVICE_DYING;
cn_del_callback(&kvp_id);
cancel_delayed_work_sync(&kvp_timeout_work);
cancel_work_sync(&kvp_sendkey_work);
hvutil_transport_destroy(hvt);
}