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Subject[PATCH 16/21] Drivers: hv: kvp: convert to hv_utils_transport
Date
From: Vitaly Kuznetsov <vkuznets@redhat.com>

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>
---
drivers/hv/hv_kvp.c | 91 +++++++++++++++++++++++---------------------------
1 files changed, 42 insertions(+), 49 deletions(-)

diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index a70d202..baa1208 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -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);
}
--
1.7.4.1


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