drivers/staging/hv/NetVscApi.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #ifndef _NETVSC_API_H_
  26 #define _NETVSC_API_H_
  27
  28 #include "VmbusApi.h"
  29 #include "List.h"
  30
  31 /* Defines */
  32 #define NETVSC_DEVICE_RING_BUFFER_SIZE  (64*PAGE_SIZE)
  33 #define HW_MACADDR_LEN                  6
  34
  35 /* Fwd declaration */
  36 struct hv_netvsc_packet;
  37
  38 /* Data types */
  39 typedef int (*PFN_ON_OPEN)(struct hv_device *Device);
  40 typedef int (*PFN_ON_CLOSE)(struct hv_device *Device);
  41
  42 typedef void (*PFN_QUERY_LINKSTATUS)(struct hv_device *Device);
  43 typedef int (*PFN_ON_SEND)(struct hv_device *dev,
  44                            struct hv_netvsc_packet *packet);
  45 typedef void (*PFN_ON_SENDRECVCOMPLETION)(void *Context);
  46
  47 typedef int (*PFN_ON_RECVCALLBACK)(struct hv_device *dev,
  48                                    struct hv_netvsc_packet *packet);
  49 typedef void (*PFN_ON_LINKSTATUS_CHANGED)(struct hv_device *dev, u32 Status);
  50
  51 /* Represent the xfer page packet which contains 1 or more netvsc packet */
  52 struct xferpage_packet {
  53         LIST_ENTRY ListEntry;
  54
  55         /* # of netvsc packets this xfer packet contains */
  56         u32 Count;
  57 };
  58
  59 /* The number of pages which are enough to cover jumbo frame buffer. */
  60 #define NETVSC_PACKET_MAXPAGE           4
  61
  62 /*
  63  * Represent netvsc packet which contains 1 RNDIS and 1 ethernet frame
  64  * within the RNDIS
  65  */
  66 struct hv_netvsc_packet {
  67         /* Bookkeeping stuff */
  68         LIST_ENTRY ListEntry;
  69
  70         struct hv_device *Device;
  71         bool IsDataPacket;
  72
  73         /*
  74          * Valid only for receives when we break a xfer page packet
  75          * into multiple netvsc packets
  76          */
  77         struct xferpage_packet *XferPagePacket;
  78
  79         union {
  80                 struct{
  81                         u64 ReceiveCompletionTid;
  82                         void *ReceiveCompletionContext;
  83                         PFN_ON_SENDRECVCOMPLETION OnReceiveCompletion;
  84                 } Recv;
  85                 struct{
  86                         u64 SendCompletionTid;
  87                         void *SendCompletionContext;
  88                         PFN_ON_SENDRECVCOMPLETION OnSendCompletion;
  89                 } Send;
  90         } Completion;
  91
  92         /* This points to the memory after PageBuffers */
  93         void *Extension;
  94
  95         u32 TotalDataBufferLength;
  96         /* Points to the send/receive buffer where the ethernet frame is */
  97         u32 PageBufferCount;
  98         struct hv_page_buffer PageBuffers[NETVSC_PACKET_MAXPAGE];
  99 };
 100
 101 /* Represents the net vsc driver */
 102 struct netvsc_driver {
 103         /* Must be the first field */
 104         /* Which is a bug FIXME! */
 105         struct hv_driver Base;
 106
 107         u32 RingBufferSize;
 108         u32 RequestExtSize;
 109
 110         /* Additional num  of page buffers to allocate */
 111         u32 AdditionalRequestPageBufferCount;
 112
 113         /*
 114          * This is set by the caller to allow us to callback when we
 115          * receive a packet from the "wire"
 116          */
 117         PFN_ON_RECVCALLBACK OnReceiveCallback;
 118
 119         PFN_ON_LINKSTATUS_CHANGED OnLinkStatusChanged;
 120
 121         /* Specific to this driver */
 122         PFN_ON_OPEN OnOpen;
 123         PFN_ON_CLOSE OnClose;
 124         PFN_ON_SEND OnSend;
 125         /* PFN_ON_RECVCOMPLETION OnReceiveCompletion; */
 126
 127         /* PFN_QUERY_LINKSTATUS QueryLinkStatus; */
 128
 129         void *Context;
 130 };
 131
 132 struct netvsc_device_info {
 133     unsigned char MacAddr[6];
 134     bool LinkState;     /* 0 - link up, 1 - link down */
 135 };
 136
 137 /* Interface */
 138 int NetVscInitialize(struct hv_driver *drv);
 139
 140 #endif /* _NETVSC_API_H_ */