lkml.org 
[lkml]   [2015]   [Apr]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 14/21] Drivers: hv: vss: 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_vss 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_snapshot.c | 52 +++++++++++++++++++++++----------------------
1 files changed, 27 insertions(+), 25 deletions(-)

diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index ddb1cda..2c8c246 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -25,6 +25,7 @@
#include <linux/hyperv.h>

#include "hyperv_vmbus.h"
+#include "hv_utils_transport.h"

#define VSS_MAJOR 5
#define VSS_MINOR 0
@@ -58,9 +59,9 @@ static struct {

static void vss_respond_to_host(int error);

-static struct cb_id vss_id = { CN_VSS_IDX, CN_VSS_VAL };
-static const char vss_name[] = "vss_kernel_module";
+static const char vss_devname[] = "vmbus/hv_vss";
static __u8 *recv_buffer;
+static struct hvutil_transport *hvt;

static void vss_send_op(struct work_struct *dummy);
static void vss_timeout_func(struct work_struct *dummy);
@@ -88,12 +89,12 @@ static void vss_timeout_func(struct work_struct *dummy)
hv_vss_onchannelcallback);
}

-static void
-vss_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+static int vss_on_msg(void *msg, int len)
{
- struct hv_vss_msg *vss_msg;
+ struct hv_vss_msg *vss_msg = (struct hv_vss_msg *)msg;

- vss_msg = (struct hv_vss_msg *)msg->data;
+ if (len != sizeof(*vss_msg))
+ return -EINVAL;

/*
* Don't process registration messages if we're in the middle of
@@ -101,7 +102,7 @@ vss_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
*/
if (vss_transaction.state > HVUTIL_READY &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER)
- return;
+ return -EINVAL;

if (vss_transaction.state == HVUTIL_DEVICE_INIT &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER) {
@@ -119,8 +120,9 @@ vss_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
} else {
/* This is a spurious call! */
pr_warn("VSS: Transaction not active\n");
- return;
+ return -EINVAL;
}
+ return 0;
}


@@ -128,27 +130,20 @@ static void vss_send_op(struct work_struct *dummy)
{
int op = vss_transaction.msg->vss_hdr.operation;
int rc;
- struct cn_msg *msg;
struct hv_vss_msg *vss_msg;

/* The transaction state is wrong. */
if (vss_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
return;

- msg = kzalloc(sizeof(*msg) + sizeof(*vss_msg), GFP_ATOMIC);
- if (!msg)
+ vss_msg = kzalloc(sizeof(*vss_msg), GFP_KERNEL);
+ if (!vss_msg)
return;

- vss_msg = (struct hv_vss_msg *)msg->data;
-
- msg->id.idx = CN_VSS_IDX;
- msg->id.val = CN_VSS_VAL;
-
vss_msg->vss_hdr.operation = op;
- msg->len = sizeof(struct hv_vss_msg);

vss_transaction.state = HVUTIL_USERSPACE_REQ;
- rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+ rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg));
if (rc) {
pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&vss_timeout_work)) {
@@ -157,7 +152,7 @@ static void vss_send_op(struct work_struct *dummy)
}
}

- kfree(msg);
+ kfree(vss_msg);

return;
}
@@ -308,14 +303,16 @@ void hv_vss_onchannelcallback(void *context)

}

+static void vss_on_reset(void)
+{
+ if (cancel_delayed_work_sync(&vss_timeout_work))
+ vss_respond_to_host(HV_E_FAIL);
+ vss_transaction.state = HVUTIL_DEVICE_INIT;
+}
+
int
hv_vss_init(struct hv_util_service *srv)
{
- int err;
-
- err = cn_add_callback(&vss_id, vss_name, vss_cn_callback);
- if (err)
- return err;
recv_buffer = srv->recv_buffer;

/*
@@ -326,13 +323,18 @@ hv_vss_init(struct hv_util_service *srv)
*/
vss_transaction.state = HVUTIL_DEVICE_INIT;

+ hvt = hvutil_transport_init(vss_devname, CN_VSS_IDX, CN_VSS_VAL,
+ vss_on_msg, vss_on_reset);
+ if (!hvt)
+ return -EFAULT;
+
return 0;
}

void hv_vss_deinit(void)
{
vss_transaction.state = HVUTIL_DEVICE_DYING;
- cn_del_callback(&vss_id);
cancel_delayed_work_sync(&vss_timeout_work);
cancel_work_sync(&vss_send_op_work);
+ hvutil_transport_destroy(hvt);
}
--
1.7.4.1


\
 
 \ /
  Last update: 2015-04-12 02:21    [W:0.102 / U:0.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site