175 lines
5.1 KiB
C
175 lines
5.1 KiB
C
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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offload.h
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Abstract:
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Task offloading header file
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Revision History:
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Who When What
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-------- -------- ----------------------------------------------
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created
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Notes:
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--*/
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#if OFFLOAD
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//
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// Define the maximum size of large TCP packets the driver can offload.
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// This sample driver uses shared memory to map the large packets,
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// LARGE_SEND_OFFLOAD_SIZE is useless in this case, so we just define
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// it as NIC_MAX_PACKET_SIZE. But shipping drivers should define
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// LARGE_SEND_OFFLOAD_SIZE if they support LSO, and use it as
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// MaximumPhysicalMapping when they call NdisMInitializeScatterGatherDma
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// if they use ScatterGather method. If the drivers don't support
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// LSO, then MaximumPhysicalMapping is NIC_MAX_PACKET_SIZE.
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//
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#define LARGE_SEND_OFFLOAD_SIZE NIC_MAX_PACKET_SIZE
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//
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// Definitions for header flags.
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//
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#define TCP_FLAG_FIN 0x00000100
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#define TCP_FLAG_SYN 0x00000200
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#define TCP_FLAG_RST 0x00000400
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#define TCP_FLAG_PUSH 0x00000800
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#define TCP_FLAG_ACK 0x00001000
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#define TCP_FLAG_URG 0x00002000
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//
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// These are the maximum size of TCP and IP options
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//
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#define TCP_MAX_OPTION_SIZE 40
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#define IP_MAX_OPTION_SIZE 40
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//
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// Structure of a TCP packet header.
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//
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struct TCPHeader {
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USHORT tcp_src; // Source port.
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USHORT tcp_dest; // Destination port.
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int tcp_seq; // Sequence number.
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int tcp_ack; // Ack number.
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USHORT tcp_flags; // Flags and data offset.
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USHORT tcp_window; // Window offered.
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USHORT tcp_xsum; // Checksum.
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USHORT tcp_urgent; // Urgent pointer.
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};
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typedef struct TCPHeader TCPHeader;
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//
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// IP Header format.
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//
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typedef struct IPHeader {
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UCHAR iph_verlen; // Version and length.
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UCHAR iph_tos; // Type of service.
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USHORT iph_length; // Total length of datagram.
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USHORT iph_id; // Identification.
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USHORT iph_offset; // Flags and fragment offset.
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UCHAR iph_ttl; // Time to live.
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UCHAR iph_protocol; // Protocol.
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USHORT iph_xsum; // Header checksum.
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UINT iph_src; // Source address.
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UINT iph_dest; // Destination address.
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} IPHeader;
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#define TCP_IP_MAX_HEADER_SIZE TCP_MAX_OPTION_SIZE+IP_MAX_OPTION_SIZE \
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+sizeof(TCPHeader)+sizeof(IPHeader)
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#define LARGE_SEND_MEM_SIZE_OPTION 3
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//
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// Try different size of shared memory to use
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//
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extern ULONG LargeSendSharedMemArray[];
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//
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// Compute the checksum
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//
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#define XSUM(_TmpXsum, _StartVa, _PacketLength, _Offset) \
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{ \
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PUSHORT WordPtr = (PUSHORT)((PUCHAR)_StartVa + _Offset); \
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ULONG WordCount = (_PacketLength) >> 1; \
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BOOLEAN fOddLen = (BOOLEAN)((_PacketLength) & 1); \
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while (WordCount--) \
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{ \
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_TmpXsum += *WordPtr; \
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WordPtr++; \
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} \
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if (fOddLen) \
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{ \
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_TmpXsum += (USHORT)*((PUCHAR)WordPtr); \
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} \
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_TmpXsum = (((_TmpXsum >> 16) | (_TmpXsum << 16)) + _TmpXsum) >> 16; \
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}
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//
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// Function prototypes
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//
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VOID
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e100DumpPkt(
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PNDIS_PACKET Packet
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);
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VOID
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CalculateChecksum(
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PVOID StartVa,
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ULONG PacketLength,
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PNDIS_PACKET pPacket,
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ULONG IpHdrOffset
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);
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VOID
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CalculateTcpChecksum(
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PVOID StartVa,
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ULONG PacketLength,
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ULONG IpHdrOffset
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);
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VOID
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CalculateIpChecksum(
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PUCHAR StartVa,
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ULONG IpHdrOffset
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);
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VOID
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CalculateUdpChecksum(
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PNDIS_PACKET Packet,
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ULONG IpHdrOffset
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);
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VOID
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MPOffloadSendPackets(
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IN NDIS_HANDLE MiniportAdapterContext,
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IN PPNDIS_PACKET PacketArray,
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IN UINT NumberOfPackets
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);
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NDIS_STATUS
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MpOffloadSendPacket(
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IN PMP_ADAPTER Adapter,
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IN PNDIS_PACKET Packet,
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IN BOOLEAN bFromQueue
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);
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VOID
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MP_OFFLOAD_FREE_SEND_PACKET(
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IN PMP_ADAPTER Adapter,
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IN PMP_TCB pMpTcb
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);
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VOID
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DisableOffload(
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IN PMP_ADAPTER Adapter
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);
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#endif // OFFLOAD
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