1 files changed, 339 insertions, 0 deletions
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
new file mode 100644
index 00000000000..89f52440fcf
--- /dev/null
+++ b/drivers/hv/hv_kvp.c
@@ -0,0 +1,339 @@
+/*
+ * An implementation of key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/net.h>
+#include <linux/nls.h>
+#include <linux/connector.h>
+#include <linux/workqueue.h>
+#include <linux/hyperv.h>
+
+#include "hv_kvp.h"
+
+
+
+/*
+ * Global state maintained for transaction that is being processed.
+ * Note that only one transaction can be active at any point in time.
+ *
+ * This state is set when we receive a request from the host; we
+ * cleanup this state when the transaction is completed - when we respond
+ * to the host with the key value.
+ */
+
+static struct {
+	bool active; /* transaction status - active or not */
+	int recv_len; /* number of bytes received. */
+	int index; /* current index */
+	struct vmbus_channel *recv_channel; /* chn we got the request */
+	u64 recv_req_id; /* request ID. */
+} kvp_transaction;
+
+static void kvp_send_key(struct work_struct *dummy);
+
+#define TIMEOUT_FIRED 1
+
+static void kvp_respond_to_host(char *key, char *value, int error);
+static void kvp_work_func(struct work_struct *dummy);
+static void kvp_register(void);
+
+static DECLARE_DELAYED_WORK(kvp_work, kvp_work_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 u8 *recv_buffer;
+/*
+ * Register the kernel component with the user-level daemon.
+ * As part of this registration, pass the LIC version number.
+ */
+
+static void
+kvp_register(void)
+{
+
+	struct cn_msg *msg;
+
+	msg = kzalloc(sizeof(*msg) + strlen(HV_DRV_VERSION) + 1 , GFP_ATOMIC);
+
+	if (msg) {
+		msg->id.idx =  CN_KVP_IDX;
+		msg->id.val = CN_KVP_VAL;
+		msg->seq = KVP_REGISTER;
+		strcpy(msg->data, HV_DRV_VERSION);
+		msg->len = strlen(HV_DRV_VERSION) + 1;
+		cn_netlink_send(msg, 0, GFP_ATOMIC);
+		kfree(msg);
+	}
+}
+static void
+kvp_work_func(struct work_struct *dummy)
+{
+	/*
+	 * If the timer fires, the user-mode component has not responded;
+	 * process the pending transaction.
+	 */
+	kvp_respond_to_host("Unknown key", "Guest timed out", TIMEOUT_FIRED);
+}
+
+/*
+ * Callback when data is received from user mode.
+ */
+
+static void
+kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+	struct hv_ku_msg *message;
+
+	message = (struct hv_ku_msg *)msg->data;
+	if (msg->seq == KVP_REGISTER) {
+		pr_info("KVP: user-mode registering done.\n");
+		kvp_register();
+	}
+
+	if (msg->seq == KVP_USER_SET) {
+		/*
+		 * Complete the transaction by forwarding the key value
+		 * to the host. But first, cancel the timeout.
+		 */
+		if (cancel_delayed_work_sync(&kvp_work))
+			kvp_respond_to_host(message->kvp_key,
+						message->kvp_value,
+						!strlen(message->kvp_key));
+	}
+}
+
+static void
+kvp_send_key(struct work_struct *dummy)
+{
+	struct cn_msg *msg;
+	int index = kvp_transaction.index;
+
+	msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
+
+	if (msg) {
+		msg->id.idx =  CN_KVP_IDX;
+		msg->id.val = CN_KVP_VAL;
+		msg->seq = KVP_KERNEL_GET;
+		((struct hv_ku_msg *)msg->data)->kvp_index = index;
+		msg->len = sizeof(struct hv_ku_msg);
+		cn_netlink_send(msg, 0, GFP_ATOMIC);
+		kfree(msg);
+	}
+	return;
+}
+
+/*
+ * Send a response back to the host.
+ */
+
+static void
+kvp_respond_to_host(char *key, char *value, int error)
+{
+	struct hv_kvp_msg  *kvp_msg;
+	struct hv_kvp_msg_enumerate  *kvp_data;
+	char	*key_name;
+	struct icmsg_hdr *icmsghdrp;
+	int	keylen, valuelen;
+	u32	buf_len;
+	struct vmbus_channel *channel;
+	u64	req_id;
+
+	/*
+	 * If a transaction is not active; log and return.
+	 */
+
+	if (!kvp_transaction.active) {
+		/*
+		 * This is a spurious call!
+		 */
+		pr_warn("KVP: Transaction not active\n");
+		return;
+	}
+	/*
+	 * Copy the global state for completing the transaction. Note that
+	 * only one transaction can be active at a time.
+	 */
+
+	buf_len = kvp_transaction.recv_len;
+	channel = kvp_transaction.recv_channel;
+	req_id = kvp_transaction.recv_req_id;
+
+	kvp_transaction.active = false;
+
+	if (channel->onchannel_callback == NULL)
+		/*
+		 * We have raced with util driver being unloaded;
+		 * silently return.
+		 */
+		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->kvp_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;
+		 * terminate the host-side iteration by returning an error.
+		 */
+		icmsghdrp->status = HV_E_FAIL;
+		goto response_done;
+	}
+
+	/*
+	 * The windows host expects the key/value pair to be encoded
+	 * in utf16.
+	 */
+	keylen = utf8s_to_utf16s(key_name, strlen(key_name),
+				(wchar_t *)kvp_data->data.key);
+	kvp_data->data.key_size = 2*(keylen + 1); /* utf16 encoding */
+	valuelen = utf8s_to_utf16s(value, strlen(value),
+				(wchar_t *)kvp_data->data.value);
+	kvp_data->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;
+
+response_done:
+	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+
+	vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
+				VM_PKT_DATA_INBAND, 0);
+
+}
+
+/*
+ * This callback is invoked when we get a KVP message from the host.
+ * The host ensures that only one KVP transaction can be active at a time.
+ * KVP implementation in Linux needs to forward the key to a user-mde
+ * component to retrive the corresponding value. Consequently, we cannot
+ * respond to the host in the conext of this callback. Since the host
+ * guarantees that at most only one transaction can be active at a time,
+ * we stash away the transaction state in a set of global variables.
+ */
+
+void hv_kvp_onchannelcallback(void *context)
+{
+	struct vmbus_channel *channel = context;
+	u32 recvlen;
+	u64 requestid;
+
+	struct hv_kvp_msg *kvp_msg;
+	struct hv_kvp_msg_enumerate *kvp_data;
+
+	struct icmsg_hdr *icmsghdrp;
+	struct icmsg_negotiate *negop = NULL;
+
+
+	vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE, &recvlen, &requestid);
+
+	if (recvlen > 0) {
+		icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
+			sizeof(struct vmbuspipe_hdr)];
+
+		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+			vmbus_prep_negotiate_resp(icmsghdrp, negop, recv_buffer);
+		} else {
+			kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
+				sizeof(struct vmbuspipe_hdr) +
+				sizeof(struct icmsg_hdr)];
+
+			kvp_data = &kvp_msg->kvp_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;
+
+			/*
+			 * Get the information from the
+			 * user-mode component.
+			 * component. This transaction will be
+			 * completed when we get the value from
+			 * the user-mode component.
+			 * Set a timeout to deal with
+			 * user-mode not responding.
+			 */
+			schedule_work(&kvp_sendkey_work);
+			schedule_delayed_work(&kvp_work, 5*HZ);
+
+			return;
+
+		}
+
+callback_done:
+
+		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+			| ICMSGHDRFLAG_RESPONSE;
+
+		vmbus_sendpacket(channel, recv_buffer,
+				       recvlen, requestid,
+				       VM_PKT_DATA_INBAND, 0);
+	}
+
+}
+
+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;
+
+	return 0;
+}
+
+void hv_kvp_deinit(void)
+{
+	cn_del_callback(&kvp_id);
+	cancel_delayed_work_sync(&kvp_work);
+	cancel_work_sync(&kvp_sendkey_work);
+}