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/*********************************************************
* Copyright (C) 2000 VMware, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of the Common
* Development and Distribution License (the "License") version 1.0
* and no later version. You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the License at
* http://www.opensource.org/licenses/cddl1.php
*
* See the License for the specific language governing permissions
* and limitations under the License.
*
*********************************************************/
/*
* net_sg.h --
*
* Network packet scatter gather structure.
*/
#ifndef _NET_SG_H
#define _NET_SG_H
#define INCLUDE_ALLOW_USERLEVEL
#define INCLUDE_ALLOW_VMMEXT
#define INCLUDE_ALLOW_MODULE
#define INCLUDE_ALLOW_VMNIXMOD
#define INCLUDE_ALLOW_VMK_MODULE
#define INCLUDE_ALLOW_VMKERNEL
#define INCLUDE_ALLOW_DISTRIBUTE
#include "includeCheck.h"
#define NET_SG_DEFAULT_LENGTH 16
/*
* A single scatter-gather element for a network packet.
* The address is split into low and high to save space.
* If we make it 64 bits then Windows pads things out such that
* we lose a lot of space for each scatter gather array.
* This adds up when you have embedded scatter-gather
* arrays for transmit and receive ring buffers.
*/
typedef struct NetSG_Elem {
uint32 addrLow;
uint16 addrHi;
uint16 length;
} NetSG_Elem;
typedef enum NetSG_AddrType {
NET_SG_MACH_ADDR,
NET_SG_PHYS_ADDR,
NET_SG_VIRT_ADDR,
NET_SG_VMM_STACK_OFFSET,
} NetSG_AddrType;
typedef struct NetSG_Array {
uint16 addrType;
uint16 length;
NetSG_Elem sg[NET_SG_DEFAULT_LENGTH];
} NetSG_Array;
#define NET_SG_SIZE(len) (sizeof(NetSG_Array) + (len - NET_SG_DEFAULT_LENGTH) * sizeof(NetSG_Elem))
#define NET_SG_MAKE_PA(elem) (PA)QWORD(elem.addrHi, elem.addrLow)
#define NET_SG_MAKE_PTR(elem) (char *)(uintptr_t)QWORD(elem.addrHi, elem.addrLow)
#endif
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