Staging: hv: add the Hyper-V virtual network driver
This is the virtual network driver when running Linux on top of Hyper-V. Signed-off-by: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hank Janssen
Greg Kroah-Hartman
parent
f82bd0462f
commit
fceaf24a94
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/*
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*
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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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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#ifndef _NETVSC_H_
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#define _NETVSC_H_
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#include "VmbusPacketFormat.h"
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#include "nvspprotocol.h"
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#include "List.h"
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#include "NetVscApi.h"
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//
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// #defines
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//
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//#define NVSC_MIN_PROTOCOL_VERSION 1
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//#define NVSC_MAX_PROTOCOL_VERSION 1
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#define NETVSC_SEND_BUFFER_SIZE 64*1024 // 64K
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#define NETVSC_SEND_BUFFER_ID 0xface
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#define NETVSC_RECEIVE_BUFFER_SIZE 1024*1024 // 1MB
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#define NETVSC_RECEIVE_BUFFER_ID 0xcafe
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#define NETVSC_RECEIVE_SG_COUNT 1
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// Preallocated receive packets
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#define NETVSC_RECEIVE_PACKETLIST_COUNT 256
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//
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// Data types
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//
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// Per netvsc channel-specific
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typedef struct _NETVSC_DEVICE {
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DEVICE_OBJECT *Device;
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int RefCount;
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int NumOutstandingSends;
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// List of free preallocated NETVSC_PACKET to represent receive packet
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LIST_ENTRY ReceivePacketList;
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HANDLE ReceivePacketListLock;
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// Send buffer allocated by us but manages by NetVSP
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PVOID SendBuffer;
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UINT32 SendBufferSize;
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UINT32 SendBufferGpadlHandle;
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UINT32 SendSectionSize;
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// Receive buffer allocated by us but manages by NetVSP
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PVOID ReceiveBuffer;
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UINT32 ReceiveBufferSize;
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UINT32 ReceiveBufferGpadlHandle;
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UINT32 ReceiveSectionCount;
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PNVSP_1_RECEIVE_BUFFER_SECTION ReceiveSections;
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// Used for NetVSP initialization protocol
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HANDLE ChannelInitEvent;
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NVSP_MESSAGE ChannelInitPacket;
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NVSP_MESSAGE RevokePacket;
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//UCHAR HwMacAddr[HW_MACADDR_LEN];
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// Holds rndis device info
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void *Extension;
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} NETVSC_DEVICE;
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#endif // _NETVSC_H_
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/*
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*
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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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*/
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#ifndef _RNDISFILTER_H_
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#define _RNDISFILTER_H_
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#define __struct_bcount(x)
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#include "osd.h"
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#include "NetVsc.h"
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#include "rndis.h"
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#define RNDIS_HEADER_SIZE (sizeof(RNDIS_MESSAGE) - sizeof(RNDIS_MESSAGE_CONTAINER))
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#define NDIS_PACKET_TYPE_DIRECTED 0x00000001
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#define NDIS_PACKET_TYPE_MULTICAST 0x00000002
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#define NDIS_PACKET_TYPE_ALL_MULTICAST 0x00000004
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#define NDIS_PACKET_TYPE_BROADCAST 0x00000008
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#define NDIS_PACKET_TYPE_SOURCE_ROUTING 0x00000010
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#define NDIS_PACKET_TYPE_PROMISCUOUS 0x00000020
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#define NDIS_PACKET_TYPE_SMT 0x00000040
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#define NDIS_PACKET_TYPE_ALL_LOCAL 0x00000080
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#define NDIS_PACKET_TYPE_GROUP 0x00000100
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#define NDIS_PACKET_TYPE_ALL_FUNCTIONAL 0x00000200
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#define NDIS_PACKET_TYPE_FUNCTIONAL 0x00000400
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#define NDIS_PACKET_TYPE_MAC_FRAME 0x00000800
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//
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// Interface
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//
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int
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RndisFilterInit(
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NETVSC_DRIVER_OBJECT *Driver
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);
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#endif // _RNDISFILTER_H_
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@ -0,0 +1,720 @@
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/*
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*
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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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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/device.h>
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#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
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#include <asm/io.h>
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#else
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#include <linux/io.h>
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#endif
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include "logging.h"
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#include "vmbus.h"
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#include "NetVscApi.h"
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MODULE_LICENSE("GPL");
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//
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// Static decl
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//
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static int netvsc_probe(struct device *device);
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static int netvsc_remove(struct device *device);
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static int netvsc_open(struct net_device *net);
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static void netvsc_xmit_completion(void *context);
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static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net);
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static int netvsc_recv_callback(DEVICE_OBJECT *device_obj, NETVSC_PACKET* Packet);
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static int netvsc_close(struct net_device *net);
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static struct net_device_stats *netvsc_get_stats(struct net_device *net);
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static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status);
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//
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// Data types
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//
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struct net_device_context {
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struct device_context *device_ctx; // point back to our device context
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struct net_device_stats stats;
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};
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struct netvsc_driver_context {
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// !! These must be the first 2 fields !!
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struct driver_context drv_ctx;
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NETVSC_DRIVER_OBJECT drv_obj;
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};
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//
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// Globals
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//
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static int netvsc_ringbuffer_size = NETVSC_DEVICE_RING_BUFFER_SIZE;
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// The one and only one
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static struct netvsc_driver_context g_netvsc_drv;
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//
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// Routines
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//
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/*++
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Name: netvsc_drv_init()
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Desc: NetVsc driver initialization
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--*/
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int netvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
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{
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int ret=0;
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NETVSC_DRIVER_OBJECT *net_drv_obj=&g_netvsc_drv.drv_obj;
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struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
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DPRINT_ENTER(NETVSC_DRV);
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vmbus_get_interface(&net_drv_obj->Base.VmbusChannelInterface);
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net_drv_obj->RingBufferSize = netvsc_ringbuffer_size;
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net_drv_obj->OnReceiveCallback = netvsc_recv_callback;
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net_drv_obj->OnLinkStatusChanged = netvsc_linkstatus_callback;
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// Callback to client driver to complete the initialization
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pfn_drv_init(&net_drv_obj->Base);
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drv_ctx->driver.name = net_drv_obj->Base.name;
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memcpy(&drv_ctx->class_id, &net_drv_obj->Base.deviceType, sizeof(GUID));
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#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
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drv_ctx->driver.probe = netvsc_probe;
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drv_ctx->driver.remove = netvsc_remove;
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#else
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drv_ctx->probe = netvsc_probe;
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drv_ctx->remove = netvsc_remove;
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#endif
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// The driver belongs to vmbus
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vmbus_child_driver_register(drv_ctx);
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_get_stats()
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Desc: Get the network stats
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--*/
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static struct net_device_stats *netvsc_get_stats(struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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return &net_device_ctx->stats;
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}
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/*++
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Name: netvsc_set_multicast_list()
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Desc: Set the multicast list
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Remark: No-op here
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--*/
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static void netvsc_set_multicast_list(UNUSED_VAR(struct net_device *net))
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{
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}
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/*++
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Name: netvsc_probe()
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Desc: Add the specified new device to this driver
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--*/
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static int netvsc_probe(struct device *device)
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{
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int ret=0;
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struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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struct device_context *device_ctx = device_to_device_context(device);
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DEVICE_OBJECT *device_obj = &device_ctx->device_obj;
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struct net_device *net = NULL;
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struct net_device_context *net_device_ctx;
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NETVSC_DEVICE_INFO device_info;
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DPRINT_ENTER(NETVSC_DRV);
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if (!net_drv_obj->Base.OnDeviceAdd)
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{
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return -1;
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}
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net = alloc_netdev(sizeof(struct net_device_context), "seth%d", ether_setup);
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//net = alloc_etherdev(sizeof(struct net_device_context));
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if (!net)
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{
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return -1;
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}
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// Set initial state
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netif_carrier_off(net);
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netif_stop_queue(net);
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net_device_ctx = netdev_priv(net);
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net_device_ctx->device_ctx = device_ctx;
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device->driver_data = net;
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// Notify the netvsc driver of the new device
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ret = net_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info);
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if (ret != 0)
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{
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free_netdev(net);
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device->driver_data = NULL;
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DPRINT_ERR(NETVSC_DRV, "unable to add netvsc device (ret %d)", ret);
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return ret;
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}
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// If carrier is still off ie we did not get a link status callback, update it if necessary
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// FIXME: We should use a atomic or test/set instead to avoid getting out of sync with the device's link status
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if (!netif_carrier_ok(net))
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{
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if (!device_info.LinkState)
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{
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netif_carrier_on(net);
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}
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}
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memcpy(net->dev_addr, device_info.MacAddr, ETH_ALEN);
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net->open = netvsc_open;
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net->hard_start_xmit = netvsc_start_xmit;
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net->stop = netvsc_close;
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net->get_stats = netvsc_get_stats;
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net->set_multicast_list = netvsc_set_multicast_list;
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#if !defined(KERNEL_2_6_27)
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SET_MODULE_OWNER(net);
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#endif
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SET_NETDEV_DEV(net, device);
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ret = register_netdev(net);
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if (ret != 0)
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{
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// Remove the device and release the resource
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net_drv_obj->Base.OnDeviceRemove(device_obj);
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free_netdev(net);
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}
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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static int netvsc_remove(struct device *device)
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{
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int ret=0;
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struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
|
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struct device_context *device_ctx = device_to_device_context(device);
|
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struct net_device *net = (struct net_device *)device_ctx->device.driver_data;
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DEVICE_OBJECT *device_obj = &device_ctx->device_obj;
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DPRINT_ENTER(NETVSC_DRV);
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if (net == NULL)
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{
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DPRINT_INFO(NETVSC, "no net device to remove");
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DPRINT_EXIT(NETVSC_DRV);
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return 0;
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}
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|
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if (!net_drv_obj->Base.OnDeviceRemove)
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{
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DPRINT_EXIT(NETVSC_DRV);
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return -1;
|
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}
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|
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// Stop outbound asap
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netif_stop_queue(net);
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//netif_carrier_off(net);
|
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|
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unregister_netdev(net);
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|
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// Call to the vsc driver to let it know that the device is being removed
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ret = net_drv_obj->Base.OnDeviceRemove(device_obj);
|
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if (ret != 0)
|
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{
|
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// TODO:
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DPRINT_ERR(NETVSC, "unable to remove vsc device (ret %d)", ret);
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}
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|
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free_netdev(net);
|
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|
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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|
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Name: netvsc_open()
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Desc: Open the specified interface device
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|
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--*/
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static int netvsc_open(struct net_device *net)
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{
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int ret=0;
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struct net_device_context *net_device_ctx = netdev_priv(net);
|
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struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
|
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|
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DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj;
|
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|
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DPRINT_ENTER(NETVSC_DRV);
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|
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if (netif_carrier_ok(net))
|
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{
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memset(&net_device_ctx->stats, 0 , sizeof(struct net_device_stats));
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|
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// Open up the device
|
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ret = net_drv_obj->OnOpen(device_obj);
|
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if (ret != 0)
|
||||
{
|
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DPRINT_ERR(NETVSC_DRV, "unable to open device (ret %d).", ret);
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return ret;
|
||||
}
|
||||
|
||||
netif_start_queue(net);
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}
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else
|
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{
|
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DPRINT_ERR(NETVSC_DRV, "unable to open device...link is down.");
|
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}
|
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|
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DPRINT_EXIT(NETVSC_DRV);
|
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return ret;
|
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}
|
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|
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/*++
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|
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Name: netvsc_close()
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|
||||
Desc: Close the specified interface device
|
||||
|
||||
--*/
|
||||
static int netvsc_close(struct net_device *net)
|
||||
{
|
||||
int ret=0;
|
||||
struct net_device_context *net_device_ctx = netdev_priv(net);
|
||||
struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
|
||||
struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
|
||||
NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
|
||||
|
||||
DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
netif_stop_queue(net);
|
||||
|
||||
ret = net_drv_obj->OnClose(device_obj);
|
||||
if (ret != 0)
|
||||
{
|
||||
DPRINT_ERR(NETVSC_DRV, "unable to close device (ret %d).", ret);
|
||||
}
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/*++
|
||||
|
||||
Name: netvsc_xmit_completion()
|
||||
|
||||
Desc: Send completion processing
|
||||
|
||||
--*/
|
||||
static void netvsc_xmit_completion(void *context)
|
||||
{
|
||||
NETVSC_PACKET *packet = (NETVSC_PACKET *)context;
|
||||
struct sk_buff *skb = (struct sk_buff *)(ULONG_PTR)packet->Completion.Send.SendCompletionTid;
|
||||
struct net_device* net;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
kfree(packet);
|
||||
|
||||
if (skb)
|
||||
{
|
||||
net = skb->dev;
|
||||
|
||||
dev_kfree_skb_any(skb);
|
||||
|
||||
if (netif_queue_stopped(net))
|
||||
{
|
||||
DPRINT_INFO(NETVSC_DRV, "net device (%p) waking up...", net);
|
||||
|
||||
netif_wake_queue(net);
|
||||
}
|
||||
}
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
}
|
||||
|
||||
/*++
|
||||
|
||||
Name: netvsc_start_xmit()
|
||||
|
||||
Desc: Start a send
|
||||
|
||||
--*/
|
||||
static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net)
|
||||
{
|
||||
int ret=0;
|
||||
struct net_device_context *net_device_ctx = netdev_priv(net);
|
||||
struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
|
||||
struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
|
||||
NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
|
||||
|
||||
int i=0;
|
||||
NETVSC_PACKET* packet;
|
||||
int num_frags;
|
||||
int retries=0;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
// Support only 1 chain of frags
|
||||
ASSERT(skb_shinfo(skb)->frag_list == NULL);
|
||||
ASSERT(skb->dev == net);
|
||||
|
||||
DPRINT_DBG(NETVSC_DRV, "xmit packet - len %d data_len %d", skb->len, skb->data_len);
|
||||
|
||||
// Add 1 for skb->data and any additional ones requested
|
||||
num_frags = skb_shinfo(skb)->nr_frags + 1 + net_drv_obj->AdditionalRequestPageBufferCount;
|
||||
|
||||
// Allocate a netvsc packet based on # of frags.
|
||||
packet = kzalloc(sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) + net_drv_obj->RequestExtSize, GFP_ATOMIC);
|
||||
if (!packet)
|
||||
{
|
||||
DPRINT_ERR(NETVSC_DRV, "unable to allocate NETVSC_PACKET");
|
||||
return -1;
|
||||
}
|
||||
|
||||
packet->Extension = (void*)(unsigned long)packet + sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) ;
|
||||
|
||||
// Setup the rndis header
|
||||
packet->PageBufferCount = num_frags;
|
||||
|
||||
// TODO: Flush all write buffers/ memory fence ???
|
||||
//wmb();
|
||||
|
||||
// Initialize it from the skb
|
||||
ASSERT(skb->data);
|
||||
packet->TotalDataBufferLength = skb->len;
|
||||
|
||||
// Start filling in the page buffers starting at AdditionalRequestPageBufferCount offset
|
||||
packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
|
||||
packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Offset = (unsigned long)skb->data & (PAGE_SIZE -1);
|
||||
packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Length = skb->len - skb->data_len;
|
||||
|
||||
ASSERT((skb->len - skb->data_len) <= PAGE_SIZE);
|
||||
|
||||
for (i=net_drv_obj->AdditionalRequestPageBufferCount+1; i<num_frags; i++)
|
||||
{
|
||||
packet->PageBuffers[i].Pfn = page_to_pfn(skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page);
|
||||
packet->PageBuffers[i].Offset = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page_offset;
|
||||
packet->PageBuffers[i].Length = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].size;
|
||||
}
|
||||
|
||||
// Set the completion routine
|
||||
packet->Completion.Send.OnSendCompletion = netvsc_xmit_completion;
|
||||
packet->Completion.Send.SendCompletionContext = packet;
|
||||
packet->Completion.Send.SendCompletionTid = (ULONG_PTR)skb;
|
||||
|
||||
retry_send:
|
||||
ret = net_drv_obj->OnSend(&net_device_ctx->device_ctx->device_obj, packet);
|
||||
|
||||
if (ret == 0)
|
||||
{
|
||||
#ifdef KERNEL_2_6_5
|
||||
#define NETDEV_TX_OK 0
|
||||
#define NETDEV_TX_BUSY 0
|
||||
#endif
|
||||
ret = NETDEV_TX_OK;
|
||||
net_device_ctx->stats.tx_bytes += skb->len;
|
||||
net_device_ctx->stats.tx_packets++;
|
||||
}
|
||||
else
|
||||
{
|
||||
retries++;
|
||||
if (retries < 4)
|
||||
{
|
||||
DPRINT_ERR(NETVSC_DRV, "unable to send...retrying %d...", retries);
|
||||
udelay(100);
|
||||
goto retry_send;
|
||||
}
|
||||
|
||||
// no more room or we are shutting down
|
||||
DPRINT_ERR(NETVSC_DRV, "unable to send (%d)...marking net device (%p) busy", ret, net);
|
||||
DPRINT_INFO(NETVSC_DRV, "net device (%p) stopping", net);
|
||||
|
||||
ret = NETDEV_TX_BUSY;
|
||||
net_device_ctx->stats.tx_dropped++;
|
||||
|
||||
netif_stop_queue(net);
|
||||
|
||||
// Null it since the caller will free it instead of the completion routine
|
||||
packet->Completion.Send.SendCompletionTid = 0;
|
||||
|
||||
// Release the resources since we will not get any send completion
|
||||
netvsc_xmit_completion((void*)packet);
|
||||
}
|
||||
|
||||
DPRINT_DBG(NETVSC_DRV, "# of xmits %lu total size %lu", net_device_ctx->stats.tx_packets, net_device_ctx->stats.tx_bytes);
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/*++
|
||||
|
||||
Name: netvsc_linkstatus_callback()
|
||||
|
||||
Desc: Link up/down notification
|
||||
|
||||
--*/
|
||||
static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status)
|
||||
{
|
||||
struct device_context* device_ctx = to_device_context(device_obj);
|
||||
struct net_device* net = (struct net_device *)device_ctx->device.driver_data;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
if (!net)
|
||||
{
|
||||
DPRINT_ERR(NETVSC_DRV, "got link status but net device not initialized yet");
|
||||
return;
|
||||
}
|
||||
|
||||
if (status == 1)
|
||||
{
|
||||
netif_carrier_on(net);
|
||||
netif_wake_queue(net);
|
||||
}
|
||||
else
|
||||
{
|
||||
netif_carrier_off(net);
|
||||
netif_stop_queue(net);
|
||||
}
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
}
|
||||
|
||||
|
||||
/*++
|
||||
|
||||
Name: netvsc_recv_callback()
|
||||
|
||||
Desc: Callback when we receive a packet from the "wire" on the specify device
|
||||
|
||||
--*/
|
||||
static int netvsc_recv_callback(DEVICE_OBJECT *device_obj, NETVSC_PACKET* packet)
|
||||
{
|
||||
int ret=0;
|
||||
struct device_context *device_ctx = to_device_context(device_obj);
|
||||
struct net_device *net = (struct net_device *)device_ctx->device.driver_data;
|
||||
struct net_device_context *net_device_ctx;
|
||||
|
||||
struct sk_buff *skb;
|
||||
void *data;
|
||||
int i=0;
|
||||
unsigned long flags;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
if (!net)
|
||||
{
|
||||
DPRINT_ERR(NETVSC_DRV, "got receive callback but net device not initialized yet");
|
||||
return 0;
|
||||
}
|
||||
|
||||
net_device_ctx = netdev_priv(net);
|
||||
|
||||
// Allocate a skb - TODO preallocate this
|
||||
//skb = alloc_skb(packet->TotalDataBufferLength, GFP_ATOMIC);
|
||||
skb = dev_alloc_skb(packet->TotalDataBufferLength + 2); // Pad 2-bytes to align IP header to 16 bytes
|
||||
ASSERT(skb);
|
||||
skb_reserve(skb, 2);
|
||||
skb->dev = net;
|
||||
|
||||
// for kmap_atomic
|
||||
local_irq_save(flags);
|
||||
|
||||
// Copy to skb. This copy is needed here since the memory pointed by NETVSC_PACKET
|
||||
// cannot be deallocated
|
||||
for (i=0; i<packet->PageBufferCount; i++)
|
||||
{
|
||||
data = kmap_atomic(pfn_to_page(packet->PageBuffers[i].Pfn), KM_IRQ1);
|
||||
data = (void*)(unsigned long)data + packet->PageBuffers[i].Offset;
|
||||
|
||||
memcpy(skb_put(skb, packet->PageBuffers[i].Length), data, packet->PageBuffers[i].Length);
|
||||
|
||||
kunmap_atomic((void*)((unsigned long)data - packet->PageBuffers[i].Offset), KM_IRQ1);
|
||||
}
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
skb->protocol = eth_type_trans(skb, net);
|
||||
|
||||
skb->ip_summed = CHECKSUM_NONE;
|
||||
|
||||
// Pass the skb back up. Network stack will deallocate the skb when it is done
|
||||
ret = netif_rx(skb);
|
||||
|
||||
switch (ret)
|
||||
{
|
||||
case NET_RX_DROP:
|
||||
net_device_ctx->stats.rx_dropped++;
|
||||
break;
|
||||
default:
|
||||
net_device_ctx->stats.rx_packets++;
|
||||
net_device_ctx->stats.rx_bytes += skb->len;
|
||||
break;
|
||||
|
||||
}
|
||||
DPRINT_DBG(NETVSC_DRV, "# of recvs %lu total size %lu", net_device_ctx->stats.rx_packets, net_device_ctx->stats.rx_bytes);
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int netvsc_drv_exit_cb(struct device *dev, void *data)
|
||||
{
|
||||
struct device **curr = (struct device **)data;
|
||||
*curr = dev;
|
||||
return 1; // stop iterating
|
||||
}
|
||||
|
||||
/*++
|
||||
|
||||
Name: netvsc_drv_exit()
|
||||
|
||||
Desc:
|
||||
|
||||
--*/
|
||||
void netvsc_drv_exit(void)
|
||||
{
|
||||
NETVSC_DRIVER_OBJECT *netvsc_drv_obj=&g_netvsc_drv.drv_obj;
|
||||
struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
|
||||
|
||||
struct device *current_dev=NULL;
|
||||
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
||||
#define driver_for_each_device(drv, start, data, fn) \
|
||||
struct list_head *ptr, *n; \
|
||||
list_for_each_safe(ptr, n, &((drv)->devices)) {\
|
||||
struct device *curr_dev;\
|
||||
curr_dev = list_entry(ptr, struct device, driver_list);\
|
||||
fn(curr_dev, data);\
|
||||
}
|
||||
#endif
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
while (1)
|
||||
{
|
||||
current_dev = NULL;
|
||||
|
||||
// Get the device
|
||||
driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, netvsc_drv_exit_cb);
|
||||
|
||||
if (current_dev == NULL)
|
||||
break;
|
||||
|
||||
// Initiate removal from the top-down
|
||||
DPRINT_INFO(NETVSC_DRV, "unregistering device (%p)...", current_dev);
|
||||
|
||||
device_unregister(current_dev);
|
||||
}
|
||||
|
||||
if (netvsc_drv_obj->Base.OnCleanup)
|
||||
netvsc_drv_obj->Base.OnCleanup(&netvsc_drv_obj->Base);
|
||||
|
||||
vmbus_child_driver_unregister(drv_ctx);
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
static int __init netvsc_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
DPRINT_INFO(NETVSC_DRV, "Netvsc initializing....");
|
||||
|
||||
ret = netvsc_drv_init(NetVscInitialize);
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit netvsc_exit(void)
|
||||
{
|
||||
DPRINT_ENTER(NETVSC_DRV);
|
||||
|
||||
netvsc_drv_exit();
|
||||
|
||||
DPRINT_EXIT(NETVSC_DRV);
|
||||
}
|
||||
|
||||
module_param(netvsc_ringbuffer_size, int, S_IRUGO);
|
||||
|
||||
module_init(netvsc_init);
|
||||
module_exit(netvsc_exit);
|
||||
Loading…
Reference in New Issue