1322 lines
36 KiB
C
1322 lines
36 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include "hv_api.h"
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#include "logging.h"
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#include "netvsc.h"
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#include "rndis_filter.h"
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#include "channel.h"
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/* Globals */
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static const char *driver_name = "netvsc";
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/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
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static const struct hv_guid netvsc_device_type = {
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.data = {
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0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
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0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
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}
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};
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static int netvsc_device_add(struct hv_device *device, void *additional_info);
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static int netvsc_device_remove(struct hv_device *device);
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static void netvsc_cleanup(struct hv_driver *driver);
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static void netvsc_channel_cb(void *context);
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static int netvsc_init_send_buf(struct hv_device *device);
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static int netvsc_init_recv_buf(struct hv_device *device);
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static int netvsc_destroy_send_buf(struct netvsc_device *net_device);
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static int netvsc_destroy_recv_buf(struct netvsc_device *net_device);
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static int netvsc_connect_vsp(struct hv_device *device);
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static void netvsc_send_completion(struct hv_device *device,
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struct vmpacket_descriptor *packet);
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static int netvsc_send(struct hv_device *device,
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struct hv_netvsc_packet *packet);
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static void netvsc_receive(struct hv_device *device,
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struct vmpacket_descriptor *packet);
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static void netvsc_receive_completion(void *context);
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static void netvsc_send_recv_completion(struct hv_device *device,
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u64 transaction_id);
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static struct netvsc_device *alloc_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
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if (!net_device)
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return NULL;
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/* Set to 2 to allow both inbound and outbound traffic */
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atomic_cmpxchg(&net_device->refcnt, 0, 2);
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net_device->dev = device;
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device->ext = net_device;
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return net_device;
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}
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static void free_net_device(struct netvsc_device *device)
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{
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WARN_ON(atomic_read(&device->refcnt) != 0);
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device->dev->ext = NULL;
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kfree(device);
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}
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/* Get the net device object iff exists and its refcount > 1 */
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static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = device->ext;
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if (net_device && atomic_read(&net_device->refcnt) > 1)
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atomic_inc(&net_device->refcnt);
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else
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net_device = NULL;
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return net_device;
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}
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/* Get the net device object iff exists and its refcount > 0 */
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static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = device->ext;
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if (net_device && atomic_read(&net_device->refcnt))
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atomic_inc(&net_device->refcnt);
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else
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net_device = NULL;
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return net_device;
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}
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static void put_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = device->ext;
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atomic_dec(&net_device->refcnt);
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}
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static struct netvsc_device *release_outbound_net_device(
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struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = device->ext;
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if (net_device == NULL)
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return NULL;
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/* Busy wait until the ref drop to 2, then set it to 1 */
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while (atomic_cmpxchg(&net_device->refcnt, 2, 1) != 2)
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udelay(100);
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return net_device;
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}
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static struct netvsc_device *release_inbound_net_device(
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struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = device->ext;
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if (net_device == NULL)
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return NULL;
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/* Busy wait until the ref drop to 1, then set it to 0 */
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while (atomic_cmpxchg(&net_device->refcnt, 1, 0) != 1)
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udelay(100);
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device->ext = NULL;
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return net_device;
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}
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/*
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* netvsc_initialize - Main entry point
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*/
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int netvsc_initialize(struct hv_driver *drv)
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{
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struct netvsc_driver *driver = (struct netvsc_driver *)drv;
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DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, "
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"sizeof(struct nvsp_message)=%zd, "
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"sizeof(struct vmtransfer_page_packet_header)=%zd",
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sizeof(struct hv_netvsc_packet),
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sizeof(struct nvsp_message),
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sizeof(struct vmtransfer_page_packet_header));
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drv->name = driver_name;
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memcpy(&drv->dev_type, &netvsc_device_type, sizeof(struct hv_guid));
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/* Setup the dispatch table */
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driver->base.dev_add = netvsc_device_add;
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driver->base.dev_rm = netvsc_device_remove;
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driver->base.cleanup = netvsc_cleanup;
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driver->send = netvsc_send;
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rndis_filter_init(driver);
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return 0;
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}
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static int netvsc_init_recv_buf(struct hv_device *device)
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{
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int ret = 0;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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net_device = get_outbound_net_device(device);
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if (!net_device) {
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DPRINT_ERR(NETVSC, "unable to get net device..."
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"device being destroyed?");
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return -1;
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}
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net_device->recv_buf =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
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get_order(net_device->recv_buf_size));
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if (!net_device->recv_buf) {
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DPRINT_ERR(NETVSC,
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"unable to allocate receive buffer of size %d",
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net_device->recv_buf_size);
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ret = -1;
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goto cleanup;
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}
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DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL...");
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/*
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* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
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net_device->recv_buf_size,
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&net_device->recv_buf_gpadl_handle);
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if (ret != 0) {
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DPRINT_ERR(NETVSC,
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"unable to establish receive buffer's gpadl");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
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init_packet->msg.v1_msg.send_recv_buf.
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gpadl_handle = net_device->recv_buf_gpadl_handle;
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init_packet->msg.v1_msg.
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send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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/* Send the gpadl notification request */
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net_device->wait_condition = 0;
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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DPRINT_ERR(NETVSC,
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"unable to send receive buffer's gpadl to netvsp");
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goto cleanup;
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}
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wait_event_timeout(net_device->channel_init_wait,
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net_device->wait_condition,
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msecs_to_jiffies(1000));
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BUG_ON(net_device->wait_condition == 0);
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
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DPRINT_ERR(NETVSC, "Unable to complete receive buffer "
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"initialzation with NetVsp - status %d",
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init_packet->msg.v1_msg.
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send_recv_buf_complete.status);
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ret = -1;
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goto cleanup;
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}
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/* Parse the response */
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net_device->recv_section_cnt = init_packet->msg.
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v1_msg.send_recv_buf_complete.num_sections;
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net_device->recv_section = kmalloc(net_device->recv_section_cnt
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* sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL);
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if (net_device->recv_section == NULL) {
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ret = -1;
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goto cleanup;
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}
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memcpy(net_device->recv_section,
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init_packet->msg.v1_msg.
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send_recv_buf_complete.sections,
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net_device->recv_section_cnt *
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sizeof(struct nvsp_1_receive_buffer_section));
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DPRINT_INFO(NETVSC, "Receive sections info (count %d, offset %d, "
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"endoffset %d, suballoc size %d, num suballocs %d)",
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net_device->recv_section_cnt,
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net_device->recv_section[0].offset,
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net_device->recv_section[0].end_offset,
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net_device->recv_section[0].sub_alloc_size,
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net_device->recv_section[0].num_sub_allocs);
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/*
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* For 1st release, there should only be 1 section that represents the
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* entire receive buffer
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*/
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if (net_device->recv_section_cnt != 1 ||
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net_device->recv_section->offset != 0) {
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ret = -1;
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goto cleanup;
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}
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goto exit;
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cleanup:
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netvsc_destroy_recv_buf(net_device);
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exit:
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put_net_device(device);
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return ret;
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}
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static int netvsc_init_send_buf(struct hv_device *device)
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{
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int ret = 0;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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net_device = get_outbound_net_device(device);
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if (!net_device) {
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DPRINT_ERR(NETVSC, "unable to get net device..."
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"device being destroyed?");
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return -1;
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}
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if (net_device->send_buf_size <= 0) {
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ret = -EINVAL;
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goto cleanup;
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}
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net_device->send_buf =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
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get_order(net_device->send_buf_size));
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if (!net_device->send_buf) {
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DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d",
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net_device->send_buf_size);
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ret = -1;
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goto cleanup;
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}
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DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL...");
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/*
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* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
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net_device->send_buf_size,
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&net_device->send_buf_gpadl_handle);
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if (ret != 0) {
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DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
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init_packet->msg.v1_msg.send_recv_buf.
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gpadl_handle = net_device->send_buf_gpadl_handle;
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init_packet->msg.v1_msg.send_recv_buf.id =
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NETVSC_SEND_BUFFER_ID;
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/* Send the gpadl notification request */
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net_device->wait_condition = 0;
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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DPRINT_ERR(NETVSC,
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"unable to send receive buffer's gpadl to netvsp");
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goto cleanup;
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}
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wait_event_timeout(net_device->channel_init_wait,
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net_device->wait_condition,
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msecs_to_jiffies(1000));
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BUG_ON(net_device->wait_condition == 0);
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|
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
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DPRINT_ERR(NETVSC, "Unable to complete send buffer "
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"initialzation with NetVsp - status %d",
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init_packet->msg.v1_msg.
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send_send_buf_complete.status);
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ret = -1;
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goto cleanup;
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}
|
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net_device->send_section_size = init_packet->
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msg.v1_msg.send_send_buf_complete.section_size;
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goto exit;
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cleanup:
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netvsc_destroy_send_buf(net_device);
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exit:
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put_net_device(device);
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return ret;
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}
|
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static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
|
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{
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struct nvsp_message *revoke_packet;
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int ret = 0;
|
|
|
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/*
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* If we got a section count, it means we received a
|
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* SendReceiveBufferComplete msg (ie sent
|
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* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
|
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* to send a revoke msg here
|
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*/
|
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if (net_device->recv_section_cnt) {
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DPRINT_INFO(NETVSC,
|
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"Sending NvspMessage1TypeRevokeReceiveBuffer...");
|
|
|
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
|
|
|
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revoke_packet->hdr.msg_type =
|
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NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
|
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revoke_packet->msg.v1_msg.
|
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revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
|
|
|
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ret = vmbus_sendpacket(net_device->dev->channel,
|
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revoke_packet,
|
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sizeof(struct nvsp_message),
|
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(unsigned long)revoke_packet,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
/*
|
|
* If we failed here, we might as well return and
|
|
* have a leak rather than continue and a bugchk
|
|
*/
|
|
if (ret != 0) {
|
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DPRINT_ERR(NETVSC, "unable to send revoke receive "
|
|
"buffer to netvsp");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Teardown the gpadl on the vsp end */
|
|
if (net_device->recv_buf_gpadl_handle) {
|
|
DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL...");
|
|
|
|
ret = vmbus_teardown_gpadl(net_device->dev->channel,
|
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net_device->recv_buf_gpadl_handle);
|
|
|
|
/* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC,
|
|
"unable to teardown receive buffer's gpadl");
|
|
return -1;
|
|
}
|
|
net_device->recv_buf_gpadl_handle = 0;
|
|
}
|
|
|
|
if (net_device->recv_buf) {
|
|
DPRINT_INFO(NETVSC, "Freeing up receive buffer...");
|
|
|
|
/* Free up the receive buffer */
|
|
free_pages((unsigned long)net_device->recv_buf,
|
|
get_order(net_device->recv_buf_size));
|
|
net_device->recv_buf = NULL;
|
|
}
|
|
|
|
if (net_device->recv_section) {
|
|
net_device->recv_section_cnt = 0;
|
|
kfree(net_device->recv_section);
|
|
net_device->recv_section = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_destroy_send_buf(struct netvsc_device *net_device)
|
|
{
|
|
struct nvsp_message *revoke_packet;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* If we got a section count, it means we received a
|
|
* SendReceiveBufferComplete msg (ie sent
|
|
* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
|
|
* to send a revoke msg here
|
|
*/
|
|
if (net_device->send_section_size) {
|
|
DPRINT_INFO(NETVSC,
|
|
"Sending NvspMessage1TypeRevokeSendBuffer...");
|
|
|
|
/* Send the revoke send buffer */
|
|
revoke_packet = &net_device->revoke_packet;
|
|
memset(revoke_packet, 0, sizeof(struct nvsp_message));
|
|
|
|
revoke_packet->hdr.msg_type =
|
|
NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
|
|
revoke_packet->msg.v1_msg.
|
|
revoke_send_buf.id = NETVSC_SEND_BUFFER_ID;
|
|
|
|
ret = vmbus_sendpacket(net_device->dev->channel,
|
|
revoke_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)revoke_packet,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
/*
|
|
* If we failed here, we might as well return and have a leak
|
|
* rather than continue and a bugchk
|
|
*/
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC, "unable to send revoke send buffer "
|
|
"to netvsp");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Teardown the gpadl on the vsp end */
|
|
if (net_device->send_buf_gpadl_handle) {
|
|
DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL...");
|
|
ret = vmbus_teardown_gpadl(net_device->dev->channel,
|
|
net_device->send_buf_gpadl_handle);
|
|
|
|
/*
|
|
* If we failed here, we might as well return and have a leak
|
|
* rather than continue and a bugchk
|
|
*/
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC, "unable to teardown send buffer's "
|
|
"gpadl");
|
|
return -1;
|
|
}
|
|
net_device->send_buf_gpadl_handle = 0;
|
|
}
|
|
|
|
if (net_device->send_buf) {
|
|
DPRINT_INFO(NETVSC, "Freeing up send buffer...");
|
|
|
|
/* Free up the receive buffer */
|
|
free_pages((unsigned long)net_device->send_buf,
|
|
get_order(net_device->send_buf_size));
|
|
net_device->send_buf = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int netvsc_connect_vsp(struct hv_device *device)
|
|
{
|
|
int ret;
|
|
struct netvsc_device *net_device;
|
|
struct nvsp_message *init_packet;
|
|
int ndis_version;
|
|
|
|
net_device = get_outbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "unable to get net device..."
|
|
"device being destroyed?");
|
|
return -1;
|
|
}
|
|
|
|
init_packet = &net_device->channel_init_pkt;
|
|
|
|
memset(init_packet, 0, sizeof(struct nvsp_message));
|
|
init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
|
|
init_packet->msg.init_msg.init.min_protocol_ver =
|
|
NVSP_MIN_PROTOCOL_VERSION;
|
|
init_packet->msg.init_msg.init.max_protocol_ver =
|
|
NVSP_MAX_PROTOCOL_VERSION;
|
|
|
|
DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit...");
|
|
|
|
/* Send the init request */
|
|
net_device->wait_condition = 0;
|
|
ret = vmbus_sendpacket(device->channel, init_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)init_packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
|
|
goto cleanup;
|
|
}
|
|
|
|
wait_event_timeout(net_device->channel_init_wait,
|
|
net_device->wait_condition,
|
|
msecs_to_jiffies(1000));
|
|
if (net_device->wait_condition == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)",
|
|
init_packet->msg.init_msg.init_complete.status,
|
|
init_packet->msg.init_msg.
|
|
init_complete.max_mdl_chain_len);
|
|
|
|
if (init_packet->msg.init_msg.init_complete.status !=
|
|
NVSP_STAT_SUCCESS) {
|
|
DPRINT_ERR(NETVSC,
|
|
"unable to initialize with netvsp (status 0x%x)",
|
|
init_packet->msg.init_msg.init_complete.status);
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (init_packet->msg.init_msg.init_complete.
|
|
negotiated_protocol_ver != NVSP_PROTOCOL_VERSION_1) {
|
|
DPRINT_ERR(NETVSC, "unable to initialize with netvsp "
|
|
"(version expected 1 got %d)",
|
|
init_packet->msg.init_msg.
|
|
init_complete.negotiated_protocol_ver);
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion...");
|
|
|
|
/* Send the ndis version */
|
|
memset(init_packet, 0, sizeof(struct nvsp_message));
|
|
|
|
ndis_version = 0x00050000;
|
|
|
|
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
|
|
init_packet->msg.v1_msg.
|
|
send_ndis_ver.ndis_major_ver =
|
|
(ndis_version & 0xFFFF0000) >> 16;
|
|
init_packet->msg.v1_msg.
|
|
send_ndis_ver.ndis_minor_ver =
|
|
ndis_version & 0xFFFF;
|
|
|
|
/* Send the init request */
|
|
ret = vmbus_sendpacket(device->channel, init_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)init_packet,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC,
|
|
"unable to send NvspMessage1TypeSendNdisVersion");
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Post the big receive buffer to NetVSP */
|
|
ret = netvsc_init_recv_buf(device);
|
|
if (ret == 0)
|
|
ret = netvsc_init_send_buf(device);
|
|
|
|
cleanup:
|
|
put_net_device(device);
|
|
return ret;
|
|
}
|
|
|
|
static void NetVscDisconnectFromVsp(struct netvsc_device *net_device)
|
|
{
|
|
netvsc_destroy_recv_buf(net_device);
|
|
netvsc_destroy_send_buf(net_device);
|
|
}
|
|
|
|
/*
|
|
* netvsc_device_add - Callback when the device belonging to this
|
|
* driver is added
|
|
*/
|
|
static int netvsc_device_add(struct hv_device *device, void *additional_info)
|
|
{
|
|
int ret = 0;
|
|
int i;
|
|
struct netvsc_device *net_device;
|
|
struct hv_netvsc_packet *packet, *pos;
|
|
struct netvsc_driver *net_driver =
|
|
(struct netvsc_driver *)device->drv;
|
|
|
|
net_device = alloc_net_device(device);
|
|
if (!net_device) {
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", net_device);
|
|
|
|
/* Initialize the NetVSC channel extension */
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
|
|
spin_lock_init(&net_device->recv_pkt_list_lock);
|
|
|
|
net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
|
|
|
|
INIT_LIST_HEAD(&net_device->recv_pkt_list);
|
|
|
|
for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
|
|
packet = kzalloc(sizeof(struct hv_netvsc_packet) +
|
|
(NETVSC_RECEIVE_SG_COUNT *
|
|
sizeof(struct hv_page_buffer)), GFP_KERNEL);
|
|
if (!packet) {
|
|
DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts "
|
|
"for receive pool (wanted %d got %d)",
|
|
NETVSC_RECEIVE_PACKETLIST_COUNT, i);
|
|
break;
|
|
}
|
|
list_add_tail(&packet->list_ent,
|
|
&net_device->recv_pkt_list);
|
|
}
|
|
init_waitqueue_head(&net_device->channel_init_wait);
|
|
|
|
/* Open the channel */
|
|
ret = vmbus_open(device->channel, net_driver->ring_buf_size,
|
|
net_driver->ring_buf_size, NULL, 0,
|
|
netvsc_channel_cb, device);
|
|
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC, "unable to open channel: %d", ret);
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Channel is opened */
|
|
DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***");
|
|
|
|
/* Connect with the NetVsp */
|
|
ret = netvsc_connect_vsp(device);
|
|
if (ret != 0) {
|
|
DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret);
|
|
ret = -1;
|
|
goto close;
|
|
}
|
|
|
|
DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***",
|
|
ret);
|
|
|
|
return ret;
|
|
|
|
close:
|
|
/* Now, we can close the channel safely */
|
|
vmbus_close(device->channel);
|
|
|
|
cleanup:
|
|
|
|
if (net_device) {
|
|
list_for_each_entry_safe(packet, pos,
|
|
&net_device->recv_pkt_list,
|
|
list_ent) {
|
|
list_del(&packet->list_ent);
|
|
kfree(packet);
|
|
}
|
|
|
|
release_outbound_net_device(device);
|
|
release_inbound_net_device(device);
|
|
|
|
free_net_device(net_device);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* netvsc_device_remove - Callback when the root bus device is removed
|
|
*/
|
|
static int netvsc_device_remove(struct hv_device *device)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
struct hv_netvsc_packet *netvsc_packet, *pos;
|
|
|
|
DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...",
|
|
device->ext);
|
|
|
|
/* Stop outbound traffic ie sends and receives completions */
|
|
net_device = release_outbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "No net device present!!");
|
|
return -1;
|
|
}
|
|
|
|
/* Wait for all send completions */
|
|
while (atomic_read(&net_device->num_outstanding_sends)) {
|
|
DPRINT_INFO(NETVSC, "waiting for %d requests to complete...",
|
|
atomic_read(&net_device->num_outstanding_sends));
|
|
udelay(100);
|
|
}
|
|
|
|
DPRINT_INFO(NETVSC, "Disconnecting from netvsp...");
|
|
|
|
NetVscDisconnectFromVsp(net_device);
|
|
|
|
DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...",
|
|
device->ext);
|
|
|
|
/* Stop inbound traffic ie receives and sends completions */
|
|
net_device = release_inbound_net_device(device);
|
|
|
|
/* At this point, no one should be accessing netDevice except in here */
|
|
DPRINT_INFO(NETVSC, "net device (%p) safe to remove", net_device);
|
|
|
|
/* Now, we can close the channel safely */
|
|
vmbus_close(device->channel);
|
|
|
|
/* Release all resources */
|
|
list_for_each_entry_safe(netvsc_packet, pos,
|
|
&net_device->recv_pkt_list, list_ent) {
|
|
list_del(&netvsc_packet->list_ent);
|
|
kfree(netvsc_packet);
|
|
}
|
|
|
|
free_net_device(net_device);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* netvsc_cleanup - Perform any cleanup when the driver is removed
|
|
*/
|
|
static void netvsc_cleanup(struct hv_driver *drv)
|
|
{
|
|
}
|
|
|
|
static void netvsc_send_completion(struct hv_device *device,
|
|
struct vmpacket_descriptor *packet)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
struct nvsp_message *nvsp_packet;
|
|
struct hv_netvsc_packet *nvsc_packet;
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "unable to get net device..."
|
|
"device being destroyed?");
|
|
return;
|
|
}
|
|
|
|
nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
|
|
(packet->offset8 << 3));
|
|
|
|
DPRINT_DBG(NETVSC, "send completion packet - type %d",
|
|
nvsp_packet->hdr.msg_type);
|
|
|
|
if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
|
|
(nvsp_packet->hdr.msg_type ==
|
|
NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
|
|
(nvsp_packet->hdr.msg_type ==
|
|
NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
|
|
/* Copy the response back */
|
|
memcpy(&net_device->channel_init_pkt, nvsp_packet,
|
|
sizeof(struct nvsp_message));
|
|
net_device->wait_condition = 1;
|
|
wake_up(&net_device->channel_init_wait);
|
|
} else if (nvsp_packet->hdr.msg_type ==
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
|
|
/* Get the send context */
|
|
nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
|
|
packet->trans_id;
|
|
|
|
/* Notify the layer above us */
|
|
nvsc_packet->completion.send.send_completion(
|
|
nvsc_packet->completion.send.send_completion_ctx);
|
|
|
|
atomic_dec(&net_device->num_outstanding_sends);
|
|
} else {
|
|
DPRINT_ERR(NETVSC, "Unknown send completion packet type - "
|
|
"%d received!!", nvsp_packet->hdr.msg_type);
|
|
}
|
|
|
|
put_net_device(device);
|
|
}
|
|
|
|
static int netvsc_send(struct hv_device *device,
|
|
struct hv_netvsc_packet *packet)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
int ret = 0;
|
|
|
|
struct nvsp_message sendMessage;
|
|
|
|
net_device = get_outbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
|
|
"ignoring outbound packets", net_device);
|
|
return -2;
|
|
}
|
|
|
|
sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
|
|
if (packet->is_data_pkt) {
|
|
/* 0 is RMC_DATA; */
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
|
|
} else {
|
|
/* 1 is RMC_CONTROL; */
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
|
|
}
|
|
|
|
/* Not using send buffer section */
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
|
|
0xFFFFFFFF;
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
|
|
|
|
if (packet->page_buf_cnt) {
|
|
ret = vmbus_sendpacket_pagebuffer(device->channel,
|
|
packet->page_buf,
|
|
packet->page_buf_cnt,
|
|
&sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)packet);
|
|
} else {
|
|
ret = vmbus_sendpacket(device->channel, &sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
}
|
|
|
|
if (ret != 0)
|
|
DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d",
|
|
packet, ret);
|
|
|
|
atomic_inc(&net_device->num_outstanding_sends);
|
|
put_net_device(device);
|
|
return ret;
|
|
}
|
|
|
|
static void netvsc_receive(struct hv_device *device,
|
|
struct vmpacket_descriptor *packet)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
struct vmtransfer_page_packet_header *vmxferpage_packet;
|
|
struct nvsp_message *nvsp_packet;
|
|
struct hv_netvsc_packet *netvsc_packet = NULL;
|
|
unsigned long start;
|
|
unsigned long end, end_virtual;
|
|
/* struct netvsc_driver *netvscDriver; */
|
|
struct xferpage_packet *xferpage_packet = NULL;
|
|
int i, j;
|
|
int count = 0, bytes_remain = 0;
|
|
unsigned long flags;
|
|
LIST_HEAD(listHead);
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "unable to get net device..."
|
|
"device being destroyed?");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* All inbound packets other than send completion should be xfer page
|
|
* packet
|
|
*/
|
|
if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
|
|
DPRINT_ERR(NETVSC, "Unknown packet type received - %d",
|
|
packet->type);
|
|
put_net_device(device);
|
|
return;
|
|
}
|
|
|
|
nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
|
|
(packet->offset8 << 3));
|
|
|
|
/* Make sure this is a valid nvsp packet */
|
|
if (nvsp_packet->hdr.msg_type !=
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
|
|
DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d",
|
|
nvsp_packet->hdr.msg_type);
|
|
put_net_device(device);
|
|
return;
|
|
}
|
|
|
|
DPRINT_DBG(NETVSC, "NVSP packet received - type %d",
|
|
nvsp_packet->hdr.msg_type);
|
|
|
|
vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
|
|
|
|
if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
|
|
DPRINT_ERR(NETVSC, "Invalid xfer page set id - "
|
|
"expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID,
|
|
vmxferpage_packet->xfer_pageset_id);
|
|
put_net_device(device);
|
|
return;
|
|
}
|
|
|
|
DPRINT_DBG(NETVSC, "xfer page - range count %d",
|
|
vmxferpage_packet->range_cnt);
|
|
|
|
/*
|
|
* Grab free packets (range count + 1) to represent this xfer
|
|
* page packet. +1 to represent the xfer page packet itself.
|
|
* We grab it here so that we know exactly how many we can
|
|
* fulfil
|
|
*/
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
while (!list_empty(&net_device->recv_pkt_list)) {
|
|
list_move_tail(net_device->recv_pkt_list.next, &listHead);
|
|
if (++count == vmxferpage_packet->range_cnt + 1)
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
/*
|
|
* We need at least 2 netvsc pkts (1 to represent the xfer
|
|
* page and at least 1 for the range) i.e. we can handled
|
|
* some of the xfer page packet ranges...
|
|
*/
|
|
if (count < 2) {
|
|
DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. "
|
|
"Dropping this xfer page packet completely!",
|
|
count, vmxferpage_packet->range_cnt + 1);
|
|
|
|
/* Return it to the freelist */
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
for (i = count; i != 0; i--) {
|
|
list_move_tail(listHead.next,
|
|
&net_device->recv_pkt_list);
|
|
}
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
|
|
flags);
|
|
|
|
netvsc_send_recv_completion(device,
|
|
vmxferpage_packet->d.trans_id);
|
|
|
|
put_net_device(device);
|
|
return;
|
|
}
|
|
|
|
/* Remove the 1st packet to represent the xfer page packet itself */
|
|
xferpage_packet = (struct xferpage_packet *)listHead.next;
|
|
list_del(&xferpage_packet->list_ent);
|
|
|
|
/* This is how much we can satisfy */
|
|
xferpage_packet->count = count - 1;
|
|
|
|
if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
|
|
DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer "
|
|
"page...got %d", vmxferpage_packet->range_cnt,
|
|
xferpage_packet->count);
|
|
}
|
|
|
|
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
|
|
for (i = 0; i < (count - 1); i++) {
|
|
netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
|
|
list_del(&netvsc_packet->list_ent);
|
|
|
|
/* Initialize the netvsc packet */
|
|
netvsc_packet->xfer_page_pkt = xferpage_packet;
|
|
netvsc_packet->completion.recv.recv_completion =
|
|
netvsc_receive_completion;
|
|
netvsc_packet->completion.recv.recv_completion_ctx =
|
|
netvsc_packet;
|
|
netvsc_packet->device = device;
|
|
/* Save this so that we can send it back */
|
|
netvsc_packet->completion.recv.recv_completion_tid =
|
|
vmxferpage_packet->d.trans_id;
|
|
|
|
netvsc_packet->total_data_buflen =
|
|
vmxferpage_packet->ranges[i].byte_count;
|
|
netvsc_packet->page_buf_cnt = 1;
|
|
|
|
netvsc_packet->page_buf[0].len =
|
|
vmxferpage_packet->ranges[i].byte_count;
|
|
|
|
start = virt_to_phys((void *)((unsigned long)net_device->
|
|
recv_buf + vmxferpage_packet->ranges[i].byte_offset));
|
|
|
|
netvsc_packet->page_buf[0].pfn = start >> PAGE_SHIFT;
|
|
end_virtual = (unsigned long)net_device->recv_buf
|
|
+ vmxferpage_packet->ranges[i].byte_offset
|
|
+ vmxferpage_packet->ranges[i].byte_count - 1;
|
|
end = virt_to_phys((void *)end_virtual);
|
|
|
|
/* Calculate the page relative offset */
|
|
netvsc_packet->page_buf[0].offset =
|
|
vmxferpage_packet->ranges[i].byte_offset &
|
|
(PAGE_SIZE - 1);
|
|
if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) {
|
|
/* Handle frame across multiple pages: */
|
|
netvsc_packet->page_buf[0].len =
|
|
(netvsc_packet->page_buf[0].pfn <<
|
|
PAGE_SHIFT)
|
|
+ PAGE_SIZE - start;
|
|
bytes_remain = netvsc_packet->total_data_buflen -
|
|
netvsc_packet->page_buf[0].len;
|
|
for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) {
|
|
netvsc_packet->page_buf[j].offset = 0;
|
|
if (bytes_remain <= PAGE_SIZE) {
|
|
netvsc_packet->page_buf[j].len =
|
|
bytes_remain;
|
|
bytes_remain = 0;
|
|
} else {
|
|
netvsc_packet->page_buf[j].len =
|
|
PAGE_SIZE;
|
|
bytes_remain -= PAGE_SIZE;
|
|
}
|
|
netvsc_packet->page_buf[j].pfn =
|
|
virt_to_phys((void *)(end_virtual -
|
|
bytes_remain)) >> PAGE_SHIFT;
|
|
netvsc_packet->page_buf_cnt++;
|
|
if (bytes_remain == 0)
|
|
break;
|
|
}
|
|
}
|
|
DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => "
|
|
"(pfn %llx, offset %u, len %u)", i,
|
|
vmxferpage_packet->ranges[i].byte_offset,
|
|
vmxferpage_packet->ranges[i].byte_count,
|
|
netvsc_packet->page_buf[0].pfn,
|
|
netvsc_packet->page_buf[0].offset,
|
|
netvsc_packet->page_buf[0].len);
|
|
|
|
/* Pass it to the upper layer */
|
|
((struct netvsc_driver *)device->drv)->
|
|
recv_cb(device, netvsc_packet);
|
|
|
|
netvsc_receive_completion(netvsc_packet->
|
|
completion.recv.recv_completion_ctx);
|
|
}
|
|
|
|
put_net_device(device);
|
|
}
|
|
|
|
static void netvsc_send_recv_completion(struct hv_device *device,
|
|
u64 transaction_id)
|
|
{
|
|
struct nvsp_message recvcompMessage;
|
|
int retries = 0;
|
|
int ret;
|
|
|
|
DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx",
|
|
transaction_id);
|
|
|
|
recvcompMessage.hdr.msg_type =
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
|
|
|
|
/* FIXME: Pass in the status */
|
|
recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
|
|
NVSP_STAT_SUCCESS;
|
|
|
|
retry_send_cmplt:
|
|
/* Send the completion */
|
|
ret = vmbus_sendpacket(device->channel, &recvcompMessage,
|
|
sizeof(struct nvsp_message), transaction_id,
|
|
VM_PKT_COMP, 0);
|
|
if (ret == 0) {
|
|
/* success */
|
|
/* no-op */
|
|
} else if (ret == -1) {
|
|
/* no more room...wait a bit and attempt to retry 3 times */
|
|
retries++;
|
|
DPRINT_ERR(NETVSC, "unable to send receive completion pkt "
|
|
"(tid %llx)...retrying %d", transaction_id, retries);
|
|
|
|
if (retries < 4) {
|
|
udelay(100);
|
|
goto retry_send_cmplt;
|
|
} else {
|
|
DPRINT_ERR(NETVSC, "unable to send receive completion "
|
|
"pkt (tid %llx)...give up retrying",
|
|
transaction_id);
|
|
}
|
|
} else {
|
|
DPRINT_ERR(NETVSC, "unable to send receive completion pkt - "
|
|
"%llx", transaction_id);
|
|
}
|
|
}
|
|
|
|
/* Send a receive completion packet to RNDIS device (ie NetVsp) */
|
|
static void netvsc_receive_completion(void *context)
|
|
{
|
|
struct hv_netvsc_packet *packet = context;
|
|
struct hv_device *device = (struct hv_device *)packet->device;
|
|
struct netvsc_device *net_device;
|
|
u64 transaction_id = 0;
|
|
bool fsend_receive_comp = false;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Even though it seems logical to do a GetOutboundNetDevice() here to
|
|
* send out receive completion, we are using GetInboundNetDevice()
|
|
* since we may have disable outbound traffic already.
|
|
*/
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "unable to get net device..."
|
|
"device being destroyed?");
|
|
return;
|
|
}
|
|
|
|
/* Overloading use of the lock. */
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
packet->xfer_page_pkt->count--;
|
|
|
|
/*
|
|
* Last one in the line that represent 1 xfer page packet.
|
|
* Return the xfer page packet itself to the freelist
|
|
*/
|
|
if (packet->xfer_page_pkt->count == 0) {
|
|
fsend_receive_comp = true;
|
|
transaction_id = packet->completion.recv.recv_completion_tid;
|
|
list_add_tail(&packet->xfer_page_pkt->list_ent,
|
|
&net_device->recv_pkt_list);
|
|
|
|
}
|
|
|
|
/* Put the packet back */
|
|
list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
/* Send a receive completion for the xfer page packet */
|
|
if (fsend_receive_comp)
|
|
netvsc_send_recv_completion(device, transaction_id);
|
|
|
|
put_net_device(device);
|
|
}
|
|
|
|
static void netvsc_channel_cb(void *context)
|
|
{
|
|
int ret;
|
|
struct hv_device *device = context;
|
|
struct netvsc_device *net_device;
|
|
u32 bytes_recvd;
|
|
u64 request_id;
|
|
unsigned char *packet;
|
|
struct vmpacket_descriptor *desc;
|
|
unsigned char *buffer;
|
|
int bufferlen = NETVSC_PACKET_SIZE;
|
|
|
|
packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
|
|
GFP_ATOMIC);
|
|
if (!packet)
|
|
return;
|
|
buffer = packet;
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device) {
|
|
DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
|
|
"ignoring inbound packets", net_device);
|
|
goto out;
|
|
}
|
|
|
|
do {
|
|
ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
|
|
&bytes_recvd, &request_id);
|
|
if (ret == 0) {
|
|
if (bytes_recvd > 0) {
|
|
DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx",
|
|
bytes_recvd, request_id);
|
|
|
|
desc = (struct vmpacket_descriptor *)buffer;
|
|
switch (desc->type) {
|
|
case VM_PKT_COMP:
|
|
netvsc_send_completion(device, desc);
|
|
break;
|
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES:
|
|
netvsc_receive(device, desc);
|
|
break;
|
|
|
|
default:
|
|
DPRINT_ERR(NETVSC,
|
|
"unhandled packet type %d, "
|
|
"tid %llx len %d\n",
|
|
desc->type, request_id,
|
|
bytes_recvd);
|
|
break;
|
|
}
|
|
|
|
/* reset */
|
|
if (bufferlen > NETVSC_PACKET_SIZE) {
|
|
kfree(buffer);
|
|
buffer = packet;
|
|
bufferlen = NETVSC_PACKET_SIZE;
|
|
}
|
|
} else {
|
|
/* reset */
|
|
if (bufferlen > NETVSC_PACKET_SIZE) {
|
|
kfree(buffer);
|
|
buffer = packet;
|
|
bufferlen = NETVSC_PACKET_SIZE;
|
|
}
|
|
|
|
break;
|
|
}
|
|
} else if (ret == -2) {
|
|
/* Handle large packet */
|
|
buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
|
|
if (buffer == NULL) {
|
|
/* Try again next time around */
|
|
DPRINT_ERR(NETVSC,
|
|
"unable to allocate buffer of size "
|
|
"(%d)!!", bytes_recvd);
|
|
break;
|
|
}
|
|
|
|
bufferlen = bytes_recvd;
|
|
}
|
|
} while (1);
|
|
|
|
put_net_device(device);
|
|
out:
|
|
kfree(buffer);
|
|
return;
|
|
}
|