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linux / linux / kernel / git / torvalds / linux / refs/tags/v2.6.29-rc7 / . / drivers / staging / sxg / sxghif.h
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/*
* Copyright © 1997-2007 Alacritech, Inc. All rights reserved
*
* $Id: sxghif.h,v 1.5 2008/07/24 19:18:22 chris Exp $
*
* sxghif.h:
*
* This file contains structures and definitions for the
* Alacritech Sahara host interface
*/
/*******************************************************************************
* UCODE Registers
*******************************************************************************/
struct SXG_UCODE_REGS {
// Address 0 - 0x3F = Command codes 0-15 for TCB 0. Excode 0
u32 Icr; // Code = 0 (extended), ExCode = 0 - Int control
u32 RsvdReg1; // Code = 1 - TOE -NA
u32 RsvdReg2; // Code = 2 - TOE -NA
u32 RsvdReg3; // Code = 3 - TOE -NA
u32 RsvdReg4; // Code = 4 - TOE -NA
u32 RsvdReg5; // Code = 5 - TOE -NA
u32 CardUp; // Code = 6 - Microcode initialized when 1
u32 RsvdReg7; // Code = 7 - TOE -NA
u32 CodeNotUsed[8]; // Codes 8-15 not used. ExCode = 0
// This brings us to ExCode 1 at address 0x40 = Interrupt status pointer
u32 Isp; // Code = 0 (extended), ExCode = 1
u32 PadEx1[15]; // Codes 1-15 not used with extended codes
// ExCode 2 = Interrupt Status Register
u32 Isr; // Code = 0 (extended), ExCode = 2
u32 PadEx2[15];
// ExCode 3 = Event base register. Location of event rings
u32 EventBase; // Code = 0 (extended), ExCode = 3
u32 PadEx3[15];
// ExCode 4 = Event ring size
u32 EventSize; // Code = 0 (extended), ExCode = 4
u32 PadEx4[15];
// ExCode 5 = TCB Buffers base address
u32 TcbBase; // Code = 0 (extended), ExCode = 5
u32 PadEx5[15];
// ExCode 6 = TCB Composite Buffers base address
u32 TcbCompBase; // Code = 0 (extended), ExCode = 6
u32 PadEx6[15];
// ExCode 7 = Transmit ring base address
u32 XmtBase; // Code = 0 (extended), ExCode = 7
u32 PadEx7[15];
// ExCode 8 = Transmit ring size
u32 XmtSize; // Code = 0 (extended), ExCode = 8
u32 PadEx8[15];
// ExCode 9 = Receive ring base address
u32 RcvBase; // Code = 0 (extended), ExCode = 9
u32 PadEx9[15];
// ExCode 10 = Receive ring size
u32 RcvSize; // Code = 0 (extended), ExCode = 10
u32 PadEx10[15];
// ExCode 11 = Read EEPROM Config
u32 Config; // Code = 0 (extended), ExCode = 11
u32 PadEx11[15];
// ExCode 12 = Multicast bits 31:0
u32 McastLow; // Code = 0 (extended), ExCode = 12
u32 PadEx12[15];
// ExCode 13 = Multicast bits 63:32
u32 McastHigh; // Code = 0 (extended), ExCode = 13
u32 PadEx13[15];
// ExCode 14 = Ping
u32 Ping; // Code = 0 (extended), ExCode = 14
u32 PadEx14[15];
// ExCode 15 = Link MTU
u32 LinkMtu; // Code = 0 (extended), ExCode = 15
u32 PadEx15[15];
// ExCode 16 = Download synchronization
u32 LoadSync; // Code = 0 (extended), ExCode = 16
u32 PadEx16[15];
// ExCode 17 = Upper DRAM address bits on 32-bit systems
u32 Upper; // Code = 0 (extended), ExCode = 17
u32 PadEx17[15];
// ExCode 18 = Slowpath Send Index Address
u32 SPSendIndex; // Code = 0 (extended), ExCode = 18
u32 PadEx18[15];
u32 RsvdXF; // Code = 0 (extended), ExCode = 19
u32 PadEx19[15];
// ExCode 20 = Aggregation
u32 Aggregation; // Code = 0 (extended), ExCode = 20
u32 PadEx20[15];
// ExCode 21 = Receive MDL push timer
u32 PushTicks; // Code = 0 (extended), ExCode = 21
u32 PadEx21[15];
// ExCode 22 = TOE NA
u32 AckFrequency; // Code = 0 (extended), ExCode = 22
u32 PadEx22[15];
// ExCode 23 = TOE NA
u32 RsvdReg23;
u32 PadEx23[15];
// ExCode 24 = TOE NA
u32 RsvdReg24;
u32 PadEx24[15];
// ExCode 25 = TOE NA
u32 RsvdReg25; // Code = 0 (extended), ExCode = 25
u32 PadEx25[15];
// ExCode 26 = Receive checksum requirements
u32 ReceiveChecksum; // Code = 0 (extended), ExCode = 26
u32 PadEx26[15];
// ExCode 27 = RSS Requirements
u32 Rss; // Code = 0 (extended), ExCode = 27
u32 PadEx27[15];
// ExCode 28 = RSS Table
u32 RssTable; // Code = 0 (extended), ExCode = 28
u32 PadEx28[15];
// ExCode 29 = Event ring release entries
u32 EventRelease; // Code = 0 (extended), ExCode = 29
u32 PadEx29[15];
// ExCode 30 = Number of receive bufferlist commands on ring 0
u32 RcvCmd; // Code = 0 (extended), ExCode = 30
u32 PadEx30[15];
// ExCode 31 = slowpath transmit command - Data[31:0] = 1
u32 XmtCmd; // Code = 0 (extended), ExCode = 31
u32 PadEx31[15];
// ExCode 32 = Dump command
u32 DumpCmd; // Code = 0 (extended), ExCode = 32
u32 PadEx32[15];
// ExCode 33 = Debug command
u32 DebugCmd; // Code = 0 (extended), ExCode = 33
u32 PadEx33[15];
// There are 128 possible extended commands - each of account for 16
// words (including the non-relevent base command codes 1-15).
// Pad for the remainder of these here to bring us to the next CPU
// base. As extended codes are added, reduce the first array value in
// the following field
u32 PadToNextCpu[94][16]; // 94 = 128 - 34 (34 = Excodes 0 - 33)
};
// Interrupt control register (0) values
#define SXG_ICR_DISABLE 0x00000000
#define SXG_ICR_ENABLE 0x00000001
#define SXG_ICR_MASK 0x00000002
#define SXG_ICR_MSGID_MASK 0xFFFF0000
#define SXG_ICR_MSGID_SHIFT 16
#define SXG_ICR(_MessageId, _Data) \
((((_MessageId) << SXG_ICR_MSGID_SHIFT) & \
SXG_ICR_MSGID_MASK) | (_Data))
// The Microcode supports up to 16 RSS queues
#define SXG_MAX_RSS 16
#define SXG_MAX_RSS_TABLE_SIZE 256 // 256-byte max
#define SXG_RSS_TCP6 0x00000001 // RSS TCP over IPv6
#define SXG_RSS_TCP4 0x00000002 // RSS TCP over IPv4
#define SXG_RSS_LEGACY 0x00000004 // Line-base interrupts
#define SXG_RSS_TABLE_SIZE 0x0000FF00 // Table size mask
#define SXG_RSS_TABLE_SHIFT 8
#define SXG_RSS_BASE_CPU 0x00FF0000 // Base CPU (not used)
#define SXG_RSS_BASE_SHIFT 16
#define SXG_RCV_IP_CSUM_ENABLED 0x00000001 // ExCode 26 (ReceiveChecksum)
#define SXG_RCV_TCP_CSUM_ENABLED 0x00000002 // ExCode 26 (ReceiveChecksum)
#define SXG_XMT_CPUID_SHIFT 16
#if VPCI
#define SXG_CHECK_FOR_HANG_TIME 3000
#else
#define SXG_CHECK_FOR_HANG_TIME 5
#endif
/*
* TCB registers - This is really the same register memory area as UCODE_REGS
* above, but defined differently. Bits 17:06 of the address define the TCB,
* which means each TCB area occupies 0x40 (64) bytes, or 16 u32S. What really
* is happening is that these registers occupy the "PadEx[15]" areas in the
* SXG_UCODE_REGS definition above
*/
struct SXG_TCB_REGS {
u32 ExCode; /* Extended codes - see SXG_UCODE_REGS */
u32 Xmt; /* Code = 1 - # of Xmt descriptors added to ring */
u32 Rcv; /* Code = 2 - # of Rcv descriptors added to ring */
u32 Rsvd1; /* Code = 3 - TOE NA */
u32 Rsvd2; /* Code = 4 - TOE NA */
u32 Rsvd3; /* Code = 5 - TOE NA */
u32 Invalid; /* Code = 6 - Reserved for "CardUp" see above */
u32 Rsvd4; /* Code = 7 - TOE NA */
u32 Rsvd5; /* Code = 8 - TOE NA */
u32 Pad[7]; /* Codes 8-15 - Not used. */
};
/***************************************************************************
* ISR Format
* 31 0
* _______________________________________
* | | | | | | | | |
* |____|____|____|____|____|____|____|____|
* ^^^^ ^^^^ ^^^^ ^^^^ \ /
* ERR --|||| |||| |||| |||| -----------------
* EVENT ---||| |||| |||| |||| |
* ----|| |||| |||| |||| |-- Crash Address
* UPC -----| |||| |||| ||||
* LEVENT -------|||| |||| ||||
* PDQF --------||| |||| ||||
* RMISS ---------|| |||| ||||
* BREAK ----------| |||| ||||
* HBEATOK ------------|||| ||||
* NOHBEAT -------------||| ||||
* ERFULL --------------|| ||||
* XDROP ---------------| ||||
* -----------------||||
* -----------------||||--\
* ||---|-CpuId of crash
* |----/
***************************************************************************/
#define SXG_ISR_ERR 0x80000000 // Error
#define SXG_ISR_EVENT 0x40000000 // Event ring event
#define SXG_ISR_NONE1 0x20000000 // Not used
#define SXG_ISR_UPC 0x10000000 // Dump/debug command complete
#define SXG_ISR_LINK 0x08000000 // Link event
#define SXG_ISR_PDQF 0x04000000 // Processed data queue full
#define SXG_ISR_RMISS 0x02000000 // Drop - no host buf
#define SXG_ISR_BREAK 0x01000000 // Breakpoint hit
#define SXG_ISR_PING 0x00800000 // Heartbeat response
#define SXG_ISR_DEAD 0x00400000 // Card crash
#define SXG_ISR_ERFULL 0x00200000 // Event ring full
#define SXG_ISR_XDROP 0x00100000 // XMT Drop - no DRAM bufs or XMT err
#define SXG_ISR_SPSEND 0x00080000 // Slow send complete
#define SXG_ISR_CPU 0x00070000 // Dead CPU mask
#define SXG_ISR_CPU_SHIFT 16 // Dead CPU shift
#define SXG_ISR_CRASH 0x0000FFFF // Crash address mask
/***************************************************************************
*
* Event Ring entry
*
***************************************************************************/
/*
* 31 15 0
* .___________________.___________________.
* |<------------ Pad 0 ------------>|
* |_________|_________|_________|_________|0 0x00
* |<------------ Pad 1 ------------>|
* |_________|_________|_________|_________|4 0x04
* |<------------ Pad 2 ------------>|
* |_________|_________|_________|_________|8 0x08
* |<----------- Event Word 0 ------------>|
* |_________|_________|_________|_________|12 0x0c
* |<----------- Event Word 1 ------------>|
* |_________|_________|_________|_________|16 0x10
* |<------------- Toeplitz ------------>|
* |_________|_________|_________|_________|20 0x14
* |<----- Length ---->|<------ TCB Id --->|
* |_________|_________|_________|_________|24 0x18
* |<----- Status ---->|Evnt Code|Flsh Code|
* |_________|_________|_________|_________|28 0x1c
* ^ ^^^^ ^^^^
* |- VALID |||| ||||- RBUFC
* |||| |||-- SLOWR
* |||| ||--- UNUSED
* |||| |---- FASTC
* ||||------ FASTR
* |||-------
* ||--------
* |---------
*
* Slowpath status:
* _______________________________________
* |<----- Status ---->|Evnt Code|Flsh Code|
* |_________|Cmd Index|_________|_________|28 0x1c
* ^^^ ^^^^
* ||| ||||- ISTCPIP6
* ||| |||-- IPONLY
* ||| ||--- RCVERR
* ||| |---- IPCBAD
* |||------ TCPCBAD
* ||------- ISTCPIP
* |-------- SCERR
*
*/
#pragma pack(push, 1)
struct SXG_EVENT {
u32 Pad[1]; // not used
u32 SndUna; // SndUna value
u32 Resid; // receive MDL resid
union {
void *HostHandle; // Receive host handle
u32 Rsvd1; // TOE NA
struct {
u32 NotUsed;
u32 Rsvd2; // TOE NA
} Flush;
};
u32 Toeplitz; // RSS Toeplitz hash
union {
ushort Rsvd3; // TOE NA
ushort HdrOffset; // Slowpath
};
ushort Length; //
unsigned char Rsvd4; // TOE NA
unsigned char Code; // Event code
unsigned char CommandIndex; // New ring index
unsigned char Status; // Event status
};
#pragma pack(pop)
// Event code definitions
#define EVENT_CODE_BUFFERS 0x01 // Receive buffer list command (ring 0)
#define EVENT_CODE_SLOWRCV 0x02 // Slowpath receive
#define EVENT_CODE_UNUSED 0x04 // Was slowpath commands complete
// Status values
#define EVENT_STATUS_VALID 0x80 // Entry valid
// Slowpath status
#define EVENT_STATUS_ERROR 0x40 // Completed with error. Index in next byte
#define EVENT_STATUS_TCPIP4 0x20 // TCPIPv4 frame
#define EVENT_STATUS_TCPBAD 0x10 // Bad TCP checksum
#define EVENT_STATUS_IPBAD 0x08 // Bad IP checksum
#define EVENT_STATUS_RCVERR 0x04 // Slowpath receive error
#define EVENT_STATUS_IPONLY 0x02 // IP frame
#define EVENT_STATUS_TCPIP6 0x01 // TCPIPv6 frame
#define EVENT_STATUS_TCPIP 0x21 // Combination of v4 and v6
// Event ring
// Size must be power of 2, between 128 and 16k
#define EVENT_RING_SIZE 4096 // ??
#define EVENT_RING_BATCH 16 // Hand entries back 16 at a time.
#define EVENT_BATCH_LIMIT 256 // Stop processing events after 256 (16 * 16)
struct SXG_EVENT_RING {
struct SXG_EVENT Ring[EVENT_RING_SIZE];
};
/***************************************************************************
*
* TCB Buffers
*
***************************************************************************/
// Maximum number of TCBS supported by hardware/microcode
#define SXG_MAX_TCB 4096
// Minimum TCBs before we fail initialization
#define SXG_MIN_TCB 512
// TCB Hash
// The bucket is determined by bits 11:4 of the toeplitz if we support 4k
// offloaded connections, 10:4 if we support 2k and so on.
#define SXG_TCB_BUCKET_SHIFT 4
#define SXG_TCB_PER_BUCKET 16
#define SXG_TCB_BUCKET_MASK 0xFF0 // Bucket portion of TCB ID
#define SXG_TCB_ELEMENT_MASK 0x00F // Element within bucket
#define SXG_TCB_BUCKETS 256 // 256 * 16 = 4k
#define SXG_TCB_BUFFER_SIZE 512 // ASSERT format is correct
#define SXG_TCB_RCVQ_SIZE 736
#define SXG_TCB_COMPOSITE_BUFFER_SIZE 1024
#define SXG_LOCATE_TCP_FRAME_HDR(_TcpObject, _IPv6) \
(((_TcpObject)->VlanId) ? \
((_IPv6) ? /* Vlan frame header = yes */ \
&(_TcpObject)->CompBuffer->Frame.HasVlan.TcpIp6.SxgTcp : \
&(_TcpObject)->CompBuffer->Frame.HasVlan.TcpIp.SxgTcp) : \
((_IPv6) ? /* Vlan frame header = No */ \
&(_TcpObject)->CompBuffer->Frame.NoVlan.TcpIp6.SxgTcp : \
&(_TcpObject)->CompBuffer->Frame.NoVlan.TcpIp.SxgTcp))
#define SXG_LOCATE_IP_FRAME_HDR(_TcpObject) \
(_TcpObject)->VlanId ? \
&(_TcpObject)->CompBuffer->Frame.HasVlan.TcpIp.Ip : \
&(_TcpObject)->CompBuffer->Frame.NoVlan.TcpIp.Ip
#define SXG_LOCATE_IP6_FRAME_HDR(_TcpObject) \
(_TcpObject)->VlanId ? \
&(_TcpObject)->CompBuffer->Frame.HasVlan.TcpIp6.Ip : \
&(_TcpObject)->CompBuffer->Frame.NoVlan.TcpIp6.Ip
#if DBG
// Horrible kludge to distinguish dumb-nic, slowpath, and
// fastpath traffic. Decrement the HopLimit by one
// for slowpath, two for fastpath. This assumes the limit is measurably
// greater than two, which I think is reasonable.
// Obviously this is DBG only. Maybe remove later, or #if 0 so we
// can set it when needed
#define SXG_DBG_HOP_LIMIT(_TcpObject, _FastPath) { \
PIPV6_HDR _Ip6FrameHdr; \
if((_TcpObject)->IPv6) { \
_Ip6FrameHdr = SXG_LOCATE_IP6_FRAME_HDR((_TcpObject)); \
if(_FastPath) { \
_Ip6FrameHdr->HopLimit = (_TcpObject)->Cached.TtlOrHopLimit - 2; \
} else { \
_Ip6FrameHdr->HopLimit = (_TcpObject)->Cached.TtlOrHopLimit - 1; \
} \
} \
}
#else
// Do nothing with free build
#define SXG_DBG_HOP_LIMIT(_TcpObject, _FastPath)
#endif
/***************************************************************************
* Receive and transmit rings
***************************************************************************/
#define SXG_MAX_RING_SIZE 256
#define SXG_XMT_RING_SIZE 128 // Start with 128
#define SXG_RCV_RING_SIZE 128 // Start with 128
#define SXG_MAX_ENTRIES 4096
// Structure and macros to manage a ring
struct SXG_RING_INFO {
unsigned char Head; // Where we add entries - Note unsigned char:RING_SIZE
unsigned char Tail; // Where we pull off completed entries
ushort Size; // Ring size - Must be multiple of 2
void *Context[SXG_MAX_RING_SIZE]; // Shadow ring
};
#define SXG_INITIALIZE_RING(_ring, _size) { \
(_ring).Head = 0; \
(_ring).Tail = 0; \
(_ring).Size = (_size); \
}
#define SXG_ADVANCE_INDEX(_index, _size) ((_index) = ((_index) + 1) & ((_size) - 1))
#define SXG_PREVIOUS_INDEX(_index, _size) (((_index) - 1) &((_size) - 1))
#define SXG_RING_EMPTY(_ring) ((_ring)->Head == (_ring)->Tail)
#define SXG_RING_FULL(_ring) ((((_ring)->Head + 1) & ((_ring)->Size - 1)) == (_ring)->Tail)
#define SXG_RING_ADVANCE_HEAD(_ring) SXG_ADVANCE_INDEX((_ring)->Head, ((_ring)->Size))
#define SXG_RING_RETREAT_HEAD(_ring) ((_ring)->Head = \
SXG_PREVIOUS_INDEX((_ring)->Head, (_ring)->Size))
#define SXG_RING_ADVANCE_TAIL(_ring) { \
ASSERT((_ring)->Tail != (_ring)->Head); \
SXG_ADVANCE_INDEX((_ring)->Tail, ((_ring)->Size)); \
}
// Set cmd to the next available ring entry, set the shadow context
// entry and advance the ring.
// The appropriate lock must be held when calling this macro
#define SXG_GET_CMD(_ring, _ringinfo, _cmd, _context) { \
if(SXG_RING_FULL(_ringinfo)) { \
(_cmd) = NULL; \
} else { \
(_cmd) = &(_ring)->Descriptors[(_ringinfo)->Head]; \
(_ringinfo)->Context[(_ringinfo)->Head] = (void *)(_context);\
SXG_RING_ADVANCE_HEAD(_ringinfo); \
} \
}
// Abort the previously allocated command by retreating the head.
// NOTE - The appopriate lock MUST NOT BE DROPPED between the SXG_GET_CMD
// and SXG_ABORT_CMD calls.
#define SXG_ABORT_CMD(_ringinfo) { \
ASSERT(!(SXG_RING_EMPTY(_ringinfo))); \
SXG_RING_RETREAT_HEAD(_ringinfo); \
(_ringinfo)->Context[(_ringinfo)->Head] = NULL; \
}
// For the given ring, return a pointer to the tail cmd and context,
// clear the context and advance the tail
#define SXG_RETURN_CMD(_ring, _ringinfo, _cmd, _context) { \
(_cmd) = &(_ring)->Descriptors[(_ringinfo)->Tail]; \
(_context) = (_ringinfo)->Context[(_ringinfo)->Tail]; \
(_ringinfo)->Context[(_ringinfo)->Tail] = NULL; \
SXG_RING_ADVANCE_TAIL(_ringinfo); \
}
/***************************************************************************
*
* Host Command Buffer - commands to INIC via the Cmd Rings
*
***************************************************************************/
/*
* 31 15 0
* .___________________.___________________.
* |<-------------- Sgl Low -------------->|
* |_________|_________|_________|_________|0 0x00
* |<-------------- Sgl High ------------->|
* |_________|_________|_________|_________|4 0x04
* |<------------- Sge 0 Low ----------->|
* |_________|_________|_________|_________|8 0x08
* |<------------- Sge 0 High ----------->|
* |_________|_________|_________|_________|12 0x0c
* |<------------ Sge 0 Length ---------->|
* |_________|_________|_________|_________|16 0x10
* |<----------- Window Update ----------->|
* |<-------- SP 1st SGE offset ---------->|
* |_________|_________|_________|_________|20 0x14
* |<----------- Total Length ------------>|
* |_________|_________|_________|_________|24 0x18
* |<----- LCnt ------>|<----- Flags ----->|
* |_________|_________|_________|_________|28 0x1c
*/
#pragma pack(push, 1)
struct SXG_CMD {
dma_addr_t Sgl; // Physical address of SGL
union {
struct {
dma64_addr_t FirstSgeAddress; // Address of first SGE
u32 FirstSgeLength; // Length of first SGE
union {
u32 Rsvd1; // TOE NA
u32 SgeOffset; // Slowpath - 2nd SGE offset
u32 Resid; // MDL completion - clobbers update
};
union {
u32 TotalLength; // Total transfer length
u32 Mss; // LSO MSS
};
} Buffer;
};
union {
struct {
unsigned char Flags:4; // slowpath flags
unsigned char IpHl:4; // Ip header length (>>2)
unsigned char MacLen; // Mac header len
} CsumFlags;
struct {
ushort Flags:4; // slowpath flags
ushort TcpHdrOff:7; // TCP
ushort MacLen:5; // Mac header len
} LsoFlags;
ushort Flags; // flags
};
union {
ushort SgEntries; // SG entry count including first sge
struct {
unsigned char Status; // Copied from event status
unsigned char NotUsed;
} Status;
};
};
#pragma pack(pop)
#pragma pack(push, 1)
struct VLAN_HDR {
ushort VlanTci;
ushort VlanTpid;
};
#pragma pack(pop)
/*
* Slowpath Flags:
*
*
* LSS Flags:
* .---
* /.--- TCP Large segment send
* //.---
* ///.---
* 3 1 1 ////
* 1 5 0 ||||
* .___________________.____________vvvv.
* | |MAC | TCP | |
* | LCnt |hlen|hdroff|Flgs|
* |___________________|||||||||||||____|
*
*
* Checksum Flags
*
* .---
* /.---
* //.--- Checksum TCP
* ///.--- Checksum IP
* 3 1 //// No bits - normal send
* 1 5 7 ||||
* .___________________._______________vvvv.
* | | Offload | IP | |
* | LCnt |MAC hlen |Hlen|Flgs|
* |___________________|____|____|____|____|
*
*/
// Slowpath CMD flags
#define SXG_SLOWCMD_CSUM_IP 0x01 // Checksum IP
#define SXG_SLOWCMD_CSUM_TCP 0x02 // Checksum TCP
#define SXG_SLOWCMD_LSO 0x04 // Large segment send
struct SXG_XMT_RING {
struct SXG_CMD Descriptors[SXG_XMT_RING_SIZE];
};
struct SXG_RCV_RING {
struct SXG_CMD Descriptors[SXG_RCV_RING_SIZE];
};
/***************************************************************************
* Share memory buffer types - Used to identify asynchronous
* shared memory allocation
***************************************************************************/
enum SXG_BUFFER_TYPE {
SXG_BUFFER_TYPE_RCV, // Receive buffer
SXG_BUFFER_TYPE_SGL // SGL buffer
};
// State for SXG buffers
#define SXG_BUFFER_FREE 0x01
#define SXG_BUFFER_BUSY 0x02
#define SXG_BUFFER_ONCARD 0x04
#define SXG_BUFFER_UPSTREAM 0x08
/***************************************************************************
* Receive data buffers
*
* Receive data buffers are given to the Sahara card 128 at a time.
* This is accomplished by filling in a "receive descriptor block"
* with 128 "receive descriptors". Each descriptor consists of
* a physical address, which the card uses as the address to
* DMA data into, and a virtual address, which is given back
* to the host in the "HostHandle" portion of an event.
* The receive descriptor data structure is defined below
* as SXG_RCV_DATA_DESCRIPTOR, and the corresponding block
* is defined as SXG_RCV_DESCRIPTOR_BLOCK.
*
* This receive descriptor block is given to the card by filling
* in the Sgl field of a SXG_CMD entry from pAdapt->RcvRings[0]
* with the physical address of the receive descriptor block.
*
* Both the receive buffers and the receive descriptor blocks
* require additional data structures to maintain them
* on a free queue and contain other information associated with them.
* Those data structures are defined as the SXG_RCV_DATA_BUFFER_HDR
* and SXG_RCV_DESCRIPTOR_BLOCK_HDR respectively.
*
* Since both the receive buffers and the receive descriptor block
* must be accessible by the card, both must be allocated out of
* shared memory. To ensure that we always have a descriptor
* block available for every 128 buffers, we allocate all of
* these resources together in a single block. This entire
* block is managed by a SXG_RCV_BLOCK_HDR, who's sole purpose
* is to maintain address information so that the entire block
* can be free later.
*
* Further complicating matters is the fact that the receive
* buffers must be variable in length in order to accomodate
* jumbo frame configurations. We configure the buffer
* length so that the buffer and it's corresponding SXG_RCV_DATA_BUFFER_HDR
* structure add up to an even boundary. Then we place the
* remaining data structures after 128 of them as shown in
* the following diagram:
*
* _________________________________________
* | |
* | Variable length receive buffer #1 |
* |_________________________________________|
* | |
* | SXG_RCV_DATA_BUFFER_HDR #1 |
* |_________________________________________| <== Even 2k or 10k boundary
* | |
* | ... repeat 2-128 .. |
* |_________________________________________|
* | |
* | SXG_RCV_DESCRIPTOR_BLOCK |
* | Contains SXG_RCV_DATA_DESCRIPTOR * 128 |
* |_________________________________________|
* | |
* | SXG_RCV_DESCRIPTOR_BLOCK_HDR |
* |_________________________________________|
* | |
* | SXG_RCV_BLOCK_HDR |
* |_________________________________________|
*
* Memory consumption:
* Non-jumbo:
* Buffers and SXG_RCV_DATA_BUFFER_HDR = 2k * 128 = 256k
* + SXG_RCV_DESCRIPTOR_BLOCK = 2k
* + SXG_RCV_DESCRIPTOR_BLOCK_HDR = ~32
* + SXG_RCV_BLOCK_HDR = ~32
* => Total = ~258k/block
*
* Jumbo:
* Buffers and SXG_RCV_DATA_BUFFER_HDR = 10k * 128 = 1280k
* + SXG_RCV_DESCRIPTOR_BLOCK = 2k
* + SXG_RCV_DESCRIPTOR_BLOCK_HDR = ~32
* + SXG_RCV_BLOCK_HDR = ~32
* => Total = ~1282k/block
*
***************************************************************************/
#define SXG_RCV_DATA_BUFFERS 4096 // Amount to give to the card
#define SXG_INITIAL_RCV_DATA_BUFFERS 8192 // Initial pool of buffers
#define SXG_MIN_RCV_DATA_BUFFERS 2048 // Minimum amount and when to get more
#define SXG_MAX_RCV_BLOCKS 128 // = 16384 receive buffers
// Receive buffer header
struct SXG_RCV_DATA_BUFFER_HDR {
dma_addr_t PhysicalAddress; // Buffer physical address
// Note - DO NOT USE the VirtualAddress field to locate data.
// Use the sxg.h:SXG_RECEIVE_DATA_LOCATION macro instead.
void *VirtualAddress; // Start of buffer
struct LIST_ENTRY FreeList; // Free queue of buffers
struct SXG_RCV_DATA_BUFFER_HDR *Next; // Fastpath data buffer queue
u32 Size; // Buffer size
u32 ByteOffset; // See SXG_RESTORE_MDL_OFFSET
unsigned char State; // See SXG_BUFFER state above
unsigned char Status; // Event status (to log PUSH)
struct sk_buff *skb; // Double mapped (nbl and pkt)
};
// SxgSlowReceive uses the PACKET (skb) contained
// in the SXG_RCV_DATA_BUFFER_HDR when indicating dumb-nic data
#define SxgDumbRcvPacket skb
#define SXG_RCV_DATA_HDR_SIZE 256 // Space for SXG_RCV_DATA_BUFFER_HDR
#define SXG_RCV_DATA_BUFFER_SIZE 2048 // Non jumbo = 2k including HDR
#define SXG_RCV_JUMBO_BUFFER_SIZE 10240 // jumbo = 10k including HDR
// Receive data descriptor
struct SXG_RCV_DATA_DESCRIPTOR {
union {
struct sk_buff *VirtualAddress; // Host handle
u64 ForceTo8Bytes; // Force x86 to 8-byte boundary
};
dma_addr_t PhysicalAddress;
};
// Receive descriptor block
#define SXG_RCV_DESCRIPTORS_PER_BLOCK 128
#define SXG_RCV_DESCRIPTOR_BLOCK_SIZE 2048 // For sanity check
struct SXG_RCV_DESCRIPTOR_BLOCK {
struct SXG_RCV_DATA_DESCRIPTOR Descriptors[SXG_RCV_DESCRIPTORS_PER_BLOCK];
};
// Receive descriptor block header
struct SXG_RCV_DESCRIPTOR_BLOCK_HDR {
void *VirtualAddress; // Start of 2k buffer
dma_addr_t PhysicalAddress; // ..and it's physical address
struct LIST_ENTRY FreeList; // Free queue of descriptor blocks
unsigned char State; // See SXG_BUFFER state above
};
// Receive block header
struct SXG_RCV_BLOCK_HDR {
void *VirtualAddress; // Start of virtual memory
dma_addr_t PhysicalAddress; // ..and it's physical address
struct LIST_ENTRY AllList; // Queue of all SXG_RCV_BLOCKS
};
// Macros to determine data structure offsets into receive block
#define SXG_RCV_BLOCK_SIZE(_Buffersize) \
(((_Buffersize) * SXG_RCV_DESCRIPTORS_PER_BLOCK) + \
(sizeof(struct SXG_RCV_DESCRIPTOR_BLOCK)) + \
(sizeof(struct SXG_RCV_DESCRIPTOR_BLOCK_HDR)) + \
(sizeof(struct SXG_RCV_BLOCK_HDR)))
#define SXG_RCV_BUFFER_DATA_SIZE(_Buffersize) \
((_Buffersize) - SXG_RCV_DATA_HDR_SIZE)
#define SXG_RCV_DATA_BUFFER_HDR_OFFSET(_Buffersize) \
((_Buffersize) - SXG_RCV_DATA_HDR_SIZE)
#define SXG_RCV_DESCRIPTOR_BLOCK_OFFSET(_Buffersize) \
((_Buffersize) * SXG_RCV_DESCRIPTORS_PER_BLOCK)
#define SXG_RCV_DESCRIPTOR_BLOCK_HDR_OFFSET(_Buffersize) \
(((_Buffersize) * SXG_RCV_DESCRIPTORS_PER_BLOCK) + \
(sizeof(struct SXG_RCV_DESCRIPTOR_BLOCK)))
#define SXG_RCV_BLOCK_HDR_OFFSET(_Buffersize) \
(((_Buffersize) * SXG_RCV_DESCRIPTORS_PER_BLOCK) + \
(sizeof(struct SXG_RCV_DESCRIPTOR_BLOCK)) + \
(sizeof(struct SXG_RCV_DESCRIPTOR_BLOCK_HDR)))
// Use the miniport reserved portion of the NBL to locate
// our SXG_RCV_DATA_BUFFER_HDR structure.
struct SXG_RCV_NBL_RESERVED {
struct SXG_RCV_DATA_BUFFER_HDR *RcvDataBufferHdr;
void *Available;
};
#define SXG_RCV_NBL_BUFFER_HDR(_NBL) (((PSXG_RCV_NBL_RESERVED)NET_BUFFER_LIST_MINIPORT_RESERVED(_NBL))->RcvDataBufferHdr)
/***************************************************************************
* Scatter gather list buffer
***************************************************************************/
#define SXG_INITIAL_SGL_BUFFERS 8192 // Initial pool of SGL buffers
#define SXG_MIN_SGL_BUFFERS 2048 // Minimum amount and when to get more
#define SXG_MAX_SGL_BUFFERS 16384 // Maximum to allocate (note ADAPT:ushort)
// Self identifying structure type
enum SXG_SGL_TYPE {
SXG_SGL_DUMB, // Dumb NIC SGL
SXG_SGL_SLOW, // Slowpath protocol header - see below
SXG_SGL_CHIMNEY // Chimney offload SGL
};
// Note - the description below is Microsoft specific
//
// The following definition specifies the amount of shared memory to allocate
// for the SCATTER_GATHER_LIST portion of the SXG_SCATTER_GATHER data structure.
// The following considerations apply when setting this value:
// - First, the Sahara card is designed to read the Microsoft SGL structure
// straight out of host memory. This means that the SGL must reside in
// shared memory. If the length here is smaller than the SGL for the
// NET_BUFFER, then NDIS will allocate its own buffer. The buffer
// that NDIS allocates is not in shared memory, so when this happens,
// the SGL will need to be copied to a set of SXG_SCATTER_GATHER buffers.
// In other words.. we don't want this value to be too small.
// - On the other hand.. we're allocating up to 16k of these things. If
// we make this too big, we start to consume a ton of memory..
// At the moment, I'm going to limit the number of SG entries to 150.
// If each entry maps roughly 4k, then this should cover roughly 600kB
// NET_BUFFERs. Furthermore, since each entry is 24 bytes, the total
// SGE portion of the structure consumes 3600 bytes, which should allow
// the entire SXG_SCATTER_GATHER structure to reside comfortably within
// a 4k block, providing the remaining fields stay under 500 bytes.
//
// So with 150 entries, the SXG_SCATTER_GATHER structure becomes roughly
// 4k. At 16k of them, that amounts to 64M of shared memory. A ton, but
// manageable.
#define SXG_SGL_ENTRIES 150
// The ucode expects an NDIS SGL structure that
// is formatted for an x64 system. When running
// on an x64 system, we can simply hand the NDIS SGL
// to the card directly. For x86 systems we must reconstruct
// the SGL. The following structure defines an x64
// formatted SGL entry
struct SXG_X64_SGE {
dma64_addr_t Address; // same as wdm.h
u32 Length; // same as wdm.h
u32 CompilerPad; // The compiler pads to 8-bytes
u64 Reserved; // u32 * in wdm.h. Force to 8 bytes
};
struct SCATTER_GATHER_ELEMENT {
dma64_addr_t Address; // same as wdm.h
u32 Length; // same as wdm.h
u32 CompilerPad; // The compiler pads to 8-bytes
u64 Reserved; // u32 * in wdm.h. Force to 8 bytes
};
struct SCATTER_GATHER_LIST {
u32 NumberOfElements;
u32 *Reserved;
struct SCATTER_GATHER_ELEMENT Elements[];
};
// The card doesn't care about anything except elements, so
// we can leave the u32 * reserved field alone in the following
// SGL structure. But redefine from wdm.h:SCATTER_GATHER_LIST so
// we can specify SXG_X64_SGE and define a fixed number of elements
struct SXG_X64_SGL {
u32 NumberOfElements;
u32 *Reserved;
struct SXG_X64_SGE Elements[SXG_SGL_ENTRIES];
};
struct SXG_SCATTER_GATHER {
enum SXG_SGL_TYPE Type; // FIRST! Dumb-nic or offload
void *adapter; // Back pointer to adapter
struct LIST_ENTRY FreeList; // Free SXG_SCATTER_GATHER blocks
struct LIST_ENTRY AllList; // All SXG_SCATTER_GATHER blocks
dma_addr_t PhysicalAddress; // physical address
unsigned char State; // See SXG_BUFFER state above
unsigned char CmdIndex; // Command ring index
struct sk_buff *DumbPacket; // Associated Packet
u32 Direction; // For asynchronous completions
u32 CurOffset; // Current SGL offset
u32 SglRef; // SGL reference count
struct VLAN_HDR VlanTag; // VLAN tag to be inserted into SGL
struct SCATTER_GATHER_LIST *pSgl; // SGL Addr. Possibly &Sgl
struct SXG_X64_SGL Sgl; // SGL handed to card
};
#if defined(CONFIG_X86_64)
#define SXG_SGL_BUFFER(_SxgSgl) (&_SxgSgl->Sgl)
#define SXG_SGL_BUF_SIZE sizeof(struct SXG_X64_SGL)
#elif defined(CONFIG_X86)
// Force NDIS to give us it's own buffer so we can reformat to our own
#define SXG_SGL_BUFFER(_SxgSgl) NULL
#define SXG_SGL_BUF_SIZE 0
#else
#error staging: sxg: driver is for X86 only!
#endif