static struct {
bool active; /* transaction status - active or not */
int recv_len; /* number of bytes received. */
- int index; /* current index */
+ struct hv_kvp_msg *kvp_msg; /* current message */
struct vmbus_channel *recv_channel; /* chn we got the request */
u64 recv_req_id; /* request ID. */
+ void *kvp_context; /* for the channel callback */
} kvp_transaction;
static void kvp_send_key(struct work_struct *dummy);
struct hv_kvp_msg_enumerate *data;
message = (struct hv_kvp_msg *)msg->data;
- if (message->kvp_hdr.operation == KVP_OP_REGISTER) {
+ switch (message->kvp_hdr.operation) {
+ case KVP_OP_REGISTER:
pr_info("KVP: user-mode registering done.\n");
kvp_register();
- }
+ kvp_transaction.active = false;
+ hv_kvp_onchannelcallback(kvp_transaction.kvp_context);
+ break;
- if (message->kvp_hdr.operation == KVP_OP_ENUMERATE) {
+ default:
data = &message->body.kvp_enum_data;
/*
* Complete the transaction by forwarding the key value
{
struct cn_msg *msg;
struct hv_kvp_msg *message;
- int index = kvp_transaction.index;
+ struct hv_kvp_msg *in_msg;
+ __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
+ __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
+ __u32 val32;
+ __u64 val64;
msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
+ if (!msg)
+ return;
- if (msg) {
- msg->id.idx = CN_KVP_IDX;
- msg->id.val = CN_KVP_VAL;
+ msg->id.idx = CN_KVP_IDX;
+ msg->id.val = CN_KVP_VAL;
- message = (struct hv_kvp_msg *)msg->data;
- message->kvp_hdr.operation = KVP_OP_ENUMERATE;
- message->body.kvp_enum_data.index = index;
- msg->len = sizeof(struct hv_kvp_msg);
- cn_netlink_send(msg, 0, GFP_ATOMIC);
- kfree(msg);
+ message = (struct hv_kvp_msg *)msg->data;
+ message->kvp_hdr.operation = operation;
+ message->kvp_hdr.pool = pool;
+ in_msg = kvp_transaction.kvp_msg;
+
+ /*
+ * The key/value strings sent from the host are encoded in
+ * in utf16; convert it to utf8 strings.
+ * The host assures us that the utf16 strings will not exceed
+ * the max lengths specified. We will however, reserve room
+ * for the string terminating character - in the utf16s_utf8s()
+ * function we limit the size of the buffer where the converted
+ * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
+ * that the strings can be properly terminated!
+ */
+
+ switch (message->kvp_hdr.operation) {
+ case KVP_OP_SET:
+ switch (in_msg->body.kvp_set.data.value_type) {
+ case REG_SZ:
+ /*
+ * The value is a string - utf16 encoding.
+ */
+ message->body.kvp_set.data.value_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_set.data.value,
+ in_msg->body.kvp_set.data.value_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_set.data.value,
+ HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
+ break;
+
+ case REG_U32:
+ /*
+ * The value is a 32 bit scalar.
+ * We save this as a utf8 string.
+ */
+ val32 = in_msg->body.kvp_set.data.value_u32;
+ message->body.kvp_set.data.value_size =
+ sprintf(message->body.kvp_set.data.value,
+ "%d", val32) + 1;
+ break;
+
+ case REG_U64:
+ /*
+ * The value is a 64 bit scalar.
+ * We save this as a utf8 string.
+ */
+ val64 = in_msg->body.kvp_set.data.value_u64;
+ message->body.kvp_set.data.value_size =
+ sprintf(message->body.kvp_set.data.value,
+ "%llu", val64) + 1;
+ break;
+
+ }
+ case KVP_OP_GET:
+ message->body.kvp_set.data.key_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_set.data.key,
+ in_msg->body.kvp_set.data.key_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_set.data.key,
+ HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+ break;
+
+ case KVP_OP_DELETE:
+ message->body.kvp_delete.key_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_delete.key,
+ in_msg->body.kvp_delete.key_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_delete.key,
+ HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+ break;
+
+ case KVP_OP_ENUMERATE:
+ message->body.kvp_enum_data.index =
+ in_msg->body.kvp_enum_data.index;
+ break;
}
+
+ msg->len = sizeof(struct hv_kvp_msg);
+ cn_netlink_send(msg, 0, GFP_ATOMIC);
+ kfree(msg);
+
return;
}
kvp_respond_to_host(char *key, char *value, int error)
{
struct hv_kvp_msg *kvp_msg;
- struct hv_kvp_msg_enumerate *kvp_data;
+ struct hv_kvp_exchg_msg_value *kvp_data;
char *key_name;
struct icmsg_hdr *icmsghdrp;
- int keylen, valuelen;
+ int keylen = 0;
+ int valuelen = 0;
u32 buf_len;
struct vmbus_channel *channel;
u64 req_id;
kvp_transaction.active = false;
+ icmsghdrp = (struct icmsg_hdr *)
+ &recv_buffer[sizeof(struct vmbuspipe_hdr)];
+
if (channel->onchannel_callback == NULL)
/*
* We have raced with util driver being unloaded;
*/
return;
- icmsghdrp = (struct icmsg_hdr *)
- &recv_buffer[sizeof(struct vmbuspipe_hdr)];
- kvp_msg = (struct hv_kvp_msg *)
- &recv_buffer[sizeof(struct vmbuspipe_hdr) +
- sizeof(struct icmsg_hdr)];
- kvp_data = &kvp_msg->body.kvp_enum_data;
- key_name = key;
/*
* If the error parameter is set, terminate the host's enumeration.
*/
if (error) {
/*
- * We don't support this index or the we have timedout;
+ * Something failed or the we have timedout;
* terminate the host-side iteration by returning an error.
*/
icmsghdrp->status = HV_E_FAIL;
goto response_done;
}
+ icmsghdrp->status = HV_S_OK;
+
+ kvp_msg = (struct hv_kvp_msg *)
+ &recv_buffer[sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
+ case KVP_OP_GET:
+ kvp_data = &kvp_msg->body.kvp_get.data;
+ goto copy_value;
+
+ case KVP_OP_SET:
+ case KVP_OP_DELETE:
+ goto response_done;
+
+ default:
+ break;
+ }
+
+ kvp_data = &kvp_msg->body.kvp_enum_data.data;
+ key_name = key;
+
/*
* The windows host expects the key/value pair to be encoded
- * in utf16.
+ * in utf16. Ensure that the key/value size reported to the host
+ * will be less than or equal to the MAX size (including the
+ * terminating character).
*/
keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
- (wchar_t *) kvp_data->data.key,
- HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2);
- kvp_data->data.key_size = 2*(keylen + 1); /* utf16 encoding */
+ (wchar_t *) kvp_data->key,
+ (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
+ kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
+
+copy_value:
valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
- (wchar_t *) kvp_data->data.value,
- HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2);
- kvp_data->data.value_size = 2*(valuelen + 1); /* utf16 encoding */
+ (wchar_t *) kvp_data->value,
+ (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
+ kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
- kvp_data->data.value_type = REG_SZ; /* all our values are strings */
- icmsghdrp->status = HV_S_OK;
+ /*
+ * If the utf8s to utf16s conversion failed; notify host
+ * of the error.
+ */
+ if ((keylen < 0) || (valuelen < 0))
+ icmsghdrp->status = HV_E_FAIL;
+
+ kvp_data->value_type = REG_SZ; /* all our values are strings */
response_done:
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
u64 requestid;
struct hv_kvp_msg *kvp_msg;
- struct hv_kvp_msg_enumerate *kvp_data;
struct icmsg_hdr *icmsghdrp;
struct icmsg_negotiate *negop = NULL;
+ if (kvp_transaction.active) {
+ /*
+ * We will defer processing this callback once
+ * the current transaction is complete.
+ */
+ kvp_transaction.kvp_context = context;
+ return;
+ }
vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE, &recvlen, &requestid);
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
- kvp_data = &kvp_msg->body.kvp_enum_data;
-
- /*
- * We only support the "get" operation on
- * "KVP_POOL_AUTO" pool.
- */
-
- if ((kvp_msg->kvp_hdr.pool != KVP_POOL_AUTO) ||
- (kvp_msg->kvp_hdr.operation !=
- KVP_OP_ENUMERATE)) {
- icmsghdrp->status = HV_E_FAIL;
- goto callback_done;
- }
-
/*
* Stash away this global state for completing the
* transaction; note transactions are serialized.
*/
+
kvp_transaction.recv_len = recvlen;
kvp_transaction.recv_channel = channel;
kvp_transaction.recv_req_id = requestid;
kvp_transaction.active = true;
- kvp_transaction.index = kvp_data->index;
+ kvp_transaction.kvp_msg = kvp_msg;
/*
* Get the information from the
}
-callback_done:
-
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
return err;
recv_buffer = srv->recv_buffer;
+ /*
+ * When this driver loads, the user level daemon that
+ * processes the host requests may not yet be running.
+ * Defer processing channel callbacks until the daemon
+ * has registered.
+ */
+ kvp_transaction.active = true;
+
return 0;
}
projects / linux-flexiantxendom0-3.2.10.git / commitdiff