At long last, commit the zero copy sockets code.

MAKEDEV:	Add MAKEDEV glue for the ti(4) device nodes.

ti.4:		Update the ti(4) man page to include information on the
		TI_JUMBO_HDRSPLIT and TI_PRIVATE_JUMBOS kernel options,
		and also include information about the new character
		device interface and the associated ioctls.

man9/Makefile:	Add jumbo.9 and zero_copy.9 man pages and associated
		links.

jumbo.9:	New man page describing the jumbo buffer allocator
		interface and operation.

zero_copy.9:	New man page describing the general characteristics of
		the zero copy send and receive code, and what an
		application author should do to take advantage of the
		zero copy functionality.

NOTES:		Add entries for ZERO_COPY_SOCKETS, TI_PRIVATE_JUMBOS,
		TI_JUMBO_HDRSPLIT, MSIZE, and MCLSHIFT.

conf/files:	Add uipc_jumbo.c and uipc_cow.c.

conf/options:	Add the 5 options mentioned above.

kern_subr.c:	Receive side zero copy implementation.  This takes
		"disposable" pages attached to an mbuf, gives them to
		a user process, and then recycles the user's page.
		This is only active when ZERO_COPY_SOCKETS is turned on
		and the kern.ipc.zero_copy.receive sysctl variable is
		set to 1.

uipc_cow.c:	Send side zero copy functions.  Takes a page written
		by the user and maps it copy on write and assigns it
		kernel virtual address space.  Removes copy on write
		mapping once the buffer has been freed by the network
		stack.

uipc_jumbo.c:	Jumbo disposable page allocator code.  This allocates
		(optionally) disposable pages for network drivers that
		want to give the user the option of doing zero copy
		receive.

uipc_socket.c:	Add kern.ipc.zero_copy.{send,receive} sysctls that are
		enabled if ZERO_COPY_SOCKETS is turned on.

		Add zero copy send support to sosend() -- pages get
		mapped into the kernel instead of getting copied if
		they meet size and alignment restrictions.

uipc_syscalls.c:Un-staticize some of the sf* functions so that they
		can be used elsewhere.  (uipc_cow.c)

if_media.c:	In the SIOCGIFMEDIA ioctl in ifmedia_ioctl(), avoid
		calling malloc() with M_WAITOK.  Return an error if
		the M_NOWAIT malloc fails.

		The ti(4) driver and the wi(4) driver, at least, call
		this with a mutex held.  This causes witness warnings
		for 'ifconfig -a' with a wi(4) or ti(4) board in the
		system.  (I've only verified for ti(4)).

ip_output.c:	Fragment large datagrams so that each segment contains
		a multiple of PAGE_SIZE amount of data plus headers.
		This allows the receiver to potentially do page
		flipping on receives.

if_ti.c:	Add zero copy receive support to the ti(4) driver.  If
		TI_PRIVATE_JUMBOS is not defined, it now uses the
		jumbo(9) buffer allocator for jumbo receive buffers.

		Add a new character device interface for the ti(4)
		driver for the new debugging interface.  This allows
		(a patched version of) gdb to talk to the Tigon board
		and debug the firmware.  There are also a few additional
		debugging ioctls available through this interface.

		Add header splitting support to the ti(4) driver.

		Tweak some of the default interrupt coalescing
		parameters to more useful defaults.

		Add hooks for supporting transmit flow control, but
		leave it turned off with a comment describing why it
		is turned off.

if_tireg.h:	Change the firmware rev to 12.4.11, since we're really
		at 12.4.11 plus fixes from 12.4.13.

		Add defines needed for debugging.

		Remove the ti_stats structure, it is now defined in
		sys/tiio.h.

ti_fw.h:	12.4.11 firmware.

ti_fw2.h:	12.4.11 firmware, plus selected fixes from 12.4.13,
		and my header splitting patches.  Revision 12.4.13
		doesn't handle 10/100 negotiation properly.  (This
		firmware is the same as what was in the tree previously,
		with the addition of header splitting support.)

sys/jumbo.h:	Jumbo buffer allocator interface.

sys/mbuf.h:	Add a new external mbuf type, EXT_DISPOSABLE, to
		indicate that the payload buffer can be thrown away /
		flipped to a userland process.

socketvar.h:	Add prototype for socow_setup.

tiio.h:		ioctl interface to the character portion of the ti(4)
		driver, plus associated structure/type definitions.

uio.h:		Change prototype for uiomoveco() so that we'll know
		whether the source page is disposable.

ufs_readwrite.c:Update for new prototype of uiomoveco().

vm_fault.c:	In vm_fault(), check to see whether we need to do a page
		based copy on write fault.

vm_object.c:	Add a new function, vm_object_allocate_wait().  This
		does the same thing that vm_object allocate does, except
		that it gives the caller the opportunity to specify whether
		it should wait on the uma_zalloc() of the object structre.

		This allows vm objects to be allocated while holding a
		mutex.  (Without generating WITNESS warnings.)

		vm_object_allocate() is implemented as a call to
		vm_object_allocate_wait() with the malloc flag set to
		M_WAITOK.

vm_object.h:	Add prototype for vm_object_allocate_wait().

vm_page.c:	Add page-based copy on write setup, clear and fault
		routines.

vm_page.h:	Add page based COW function prototypes and variable in
		the vm_page structure.

Many thanks to Drew Gallatin, who wrote the zero copy send and receive
code, and to all the other folks who have tested and reviewed this code
over the years.

1 files changed, 63 insertions, 187 deletions

diff --git a/sys/pci/if_tireg.h b/sys/pci/if_tireg.h
index e244e90..e1d56f8 100644
--- a/sys/pci/if_tireg.h
+++ b/sys/pci/if_tireg.h
@@ -137,7 +137,7 @@
  */
 #define TI_FIRMWARE_MAJOR		0xc
 #define TI_FIRMWARE_MINOR		0x4
-#define TI_FIRMWARE_FIX			0xd
+#define TI_FIRMWARE_FIX			0xb
 
 /*
  * Miscelaneous Local Control register.
@@ -348,6 +348,7 @@
 #define TI_OPMODE_NO_TX_INTRS		0x00002000
 #define TI_OPMODE_NO_RX_INTRS		0x00004000
 #define TI_OPMODE_FATAL_ENB		0x40000000 /* not yet implimented */
+#define TI_OPMODE_JUMBO_HDRSPLIT	0x00008000
 
 /*
  * DMA configuration thresholds.
@@ -423,6 +424,53 @@
 #define TI_MEM_MAX		0x7FFFFF
 
 /*
+ * Maximum register address on the Tigon.
+ */
+#define	TI_REG_MAX		0x3fff
+
+/*
+ * These values were taken from Alteon's tg.h.
+ */
+#define TI_BEG_SRAM     0x0             /* host thinks it's here */
+#define TI_BEG_SCRATCH  0xc00000        /* beg of scratch pad area */
+#define TI_END_SRAM_II     0x800000        /* end of SRAM, for 2 MB stuffed */
+#define TI_END_SCRATCH_II  0xc04000        /* end of scratch pad CPU A (16KB) */
+#define TI_END_SCRATCH_B 0xc02000       /* end of scratch pad CPU B (8KB) */
+#define TI_BEG_SCRATCH_B_DEBUG 0xd00000 /* beg of scratch pad for ioctl */
+#define TI_END_SCRATCH_B_DEBUG 0xd02000 /* end of scratch pad for ioctl */
+#define TI_SCRATCH_DEBUG_OFF 0x100000   /* offset for ioctl usage */
+#define TI_END_SRAM_I     0x200000        /* end of SRAM, for 2 MB stuffed */
+#define TI_END_SCRATCH_I  0xc00800        /* end of scratch pad area (2KB) */
+#define TI_BEG_PROM     0x40000000      /* beg of PROM, special access */
+#define TI_BEG_FLASH    0x80000000      /* beg of EEPROM, special access */
+#define TI_END_FLASH    0x80100000      /* end of EEPROM for 1 MB stuff */
+#define TI_BEG_SER_EEPROM 0xa0000000    /* beg of Serial EEPROM (fake out) */
+#define TI_END_SER_EEPROM 0xa0002000    /* end of Serial EEPROM (fake out) */
+#define TI_BEG_REGS     0xc0000000      /* beg of register area */
+#define TI_END_REGS     0xc0000400      /* end of register area */
+#define TI_END_WRITE_REGS 0xc0000180    /* can't write GPRs currently */
+#define TI_BEG_REGS2    0xc0000200      /* beg of second writeable reg area */
+/* the EEPROM is byte addressable in a pretty odd way */
+#define EEPROM_BYTE_LOC 0xff000000      
+
+/*
+ * From Alteon's tg.h.
+ */
+#define TI_PROCESSOR_A          0
+#define TI_PROCESSOR_B          1
+#define TI_CPU_A                TG_PROCESSOR_A
+#define TI_CPU_B                TG_PROCESSOR_B
+
+/*
+ * Following macro can be used to access to any of the CPU registers
+ * It will adjust the address appropriately.
+ * Parameters:
+ *      reg - The register to access, e.g TI_CPU_CONTROL
+ *      cpu - cpu, i.e PROCESSOR_A or PROCESSOR_B (or TI_CPU_A or TI_CPU_B)
+ */
+#define CPU_REG(reg, cpu) ((reg) + (cpu) * 0x100)
+
+/*
  * Even on the alpha, pci addresses are 32-bit quantities
  */
 
@@ -487,192 +535,6 @@ struct ti_producer {
 };
 
 /*
- * Tigon statistics counters.
- */
-struct ti_stats {
-	/*
-	 * MAC stats, taken from RFC 1643, ethernet-like MIB
-	 */
-	volatile u_int32_t dot3StatsAlignmentErrors;		/* 0 */
-	volatile u_int32_t dot3StatsFCSErrors;			/* 1 */
-	volatile u_int32_t dot3StatsSingleCollisionFrames;	/* 2 */
-	volatile u_int32_t dot3StatsMultipleCollisionFrames;	/* 3 */
-	volatile u_int32_t dot3StatsSQETestErrors;		/* 4 */
-	volatile u_int32_t dot3StatsDeferredTransmissions;	/* 5 */
-	volatile u_int32_t dot3StatsLateCollisions;		/* 6 */
-	volatile u_int32_t dot3StatsExcessiveCollisions;	/* 7 */
-	volatile u_int32_t dot3StatsInternalMacTransmitErrors;	/* 8 */
-	volatile u_int32_t dot3StatsCarrierSenseErrors;		/* 9 */
-	volatile u_int32_t dot3StatsFrameTooLongs;		/* 10 */
-	volatile u_int32_t dot3StatsInternalMacReceiveErrors;	/* 11 */
-	/*
-	 * interface stats, taken from RFC 1213, MIB-II, interfaces group
-	 */
-	volatile u_int32_t ifIndex;				/* 12 */
-	volatile u_int32_t ifType;				/* 13 */
-	volatile u_int32_t ifMtu;				/* 14 */
-	volatile u_int32_t ifSpeed;				/* 15 */
-	volatile u_int32_t ifAdminStatus;			/* 16 */
-#define IF_ADMIN_STATUS_UP      1
-#define IF_ADMIN_STATUS_DOWN    2
-#define IF_ADMIN_STATUS_TESTING 3
-	volatile u_int32_t ifOperStatus;			/* 17 */
-#define IF_OPER_STATUS_UP       1
-#define IF_OPER_STATUS_DOWN     2
-#define IF_OPER_STATUS_TESTING  3
-#define IF_OPER_STATUS_UNKNOWN  4
-#define IF_OPER_STATUS_DORMANT  5
-	volatile u_int32_t ifLastChange;			/* 18 */
-	volatile u_int32_t ifInDiscards;			/* 19 */
-	volatile u_int32_t ifInErrors;				/* 20 */
-	volatile u_int32_t ifInUnknownProtos;			/* 21 */
-	volatile u_int32_t ifOutDiscards;			/* 22 */
-	volatile u_int32_t ifOutErrors;				/* 23 */
-	volatile u_int32_t ifOutQLen;     /* deprecated */	/* 24 */
-	volatile u_int8_t  ifPhysAddress[8]; /* 8 bytes */	/* 25 - 26 */
-	volatile u_int8_t  ifDescr[32];				/* 27 - 34 */
-	u_int32_t alignIt;      /* align to 64 bit for u_int64_ts following */
-	/*
-	 * more interface stats, taken from RFC 1573, MIB-IIupdate,
-	 * interfaces group
-	 */
-	volatile u_int64_t ifHCInOctets;			/* 36 - 37 */
-	volatile u_int64_t ifHCInUcastPkts;			/* 38 - 39 */
-	volatile u_int64_t ifHCInMulticastPkts;			/* 40 - 41 */
-	volatile u_int64_t ifHCInBroadcastPkts;			/* 42 - 43 */
-	volatile u_int64_t ifHCOutOctets;			/* 44 - 45 */
-	volatile u_int64_t ifHCOutUcastPkts;			/* 46 - 47 */
-	volatile u_int64_t ifHCOutMulticastPkts;		/* 48 - 49 */
-	volatile u_int64_t ifHCOutBroadcastPkts;		/* 50 - 51 */
-	volatile u_int32_t ifLinkUpDownTrapEnable;		/* 52 */
-	volatile u_int32_t ifHighSpeed;				/* 53 */
-	volatile u_int32_t ifPromiscuousMode; 			/* 54 */
-	volatile u_int32_t ifConnectorPresent; /* follow link state 55 */
-	/*
-	 * Host Commands
-	 */
-	volatile u_int32_t nicCmdsHostState;			/* 56 */
-	volatile u_int32_t nicCmdsFDRFiltering;			/* 57 */
-	volatile u_int32_t nicCmdsSetRecvProdIndex;		/* 58 */
-	volatile u_int32_t nicCmdsUpdateGencommStats;		/* 59 */
-	volatile u_int32_t nicCmdsResetJumboRing;		/* 60 */
-	volatile u_int32_t nicCmdsAddMCastAddr;			/* 61 */
-	volatile u_int32_t nicCmdsDelMCastAddr;			/* 62 */
-	volatile u_int32_t nicCmdsSetPromiscMode;		/* 63 */
-	volatile u_int32_t nicCmdsLinkNegotiate;		/* 64 */
-	volatile u_int32_t nicCmdsSetMACAddr;			/* 65 */
-	volatile u_int32_t nicCmdsClearProfile;			/* 66 */
-	volatile u_int32_t nicCmdsSetMulticastMode;		/* 67 */
-	volatile u_int32_t nicCmdsClearStats;			/* 68 */
-	volatile u_int32_t nicCmdsSetRecvJumboProdIndex;	/* 69 */
-	volatile u_int32_t nicCmdsSetRecvMiniProdIndex;		/* 70 */
-	volatile u_int32_t nicCmdsRefreshStats;			/* 71 */
-	volatile u_int32_t nicCmdsUnknown;			/* 72 */
-	/*
-	 * NIC Events
-	 */
-	volatile u_int32_t nicEventsNICFirmwareOperational;	/* 73 */
-	volatile u_int32_t nicEventsStatsUpdated;		/* 74 */
-	volatile u_int32_t nicEventsLinkStateChanged;		/* 75 */
-	volatile u_int32_t nicEventsError;			/* 76 */
-	volatile u_int32_t nicEventsMCastListUpdated;		/* 77 */
-	volatile u_int32_t nicEventsResetJumboRing;		/* 78 */
-	/*
-	 * Ring manipulation
-	 */
-	volatile u_int32_t nicRingSetSendProdIndex;		/* 79 */
-	volatile u_int32_t nicRingSetSendConsIndex;		/* 80 */
-	volatile u_int32_t nicRingSetRecvReturnProdIndex;	/* 81 */
-	/*
-	 * Interrupts
-	 */
-	volatile u_int32_t nicInterrupts;			/* 82 */
-	volatile u_int32_t nicAvoidedInterrupts;		/* 83 */
-	/*
-	 * BD Coalessing Thresholds
-	 */
-	volatile u_int32_t nicEventThresholdHit;		/* 84 */
-	volatile u_int32_t nicSendThresholdHit;			/* 85 */
-	volatile u_int32_t nicRecvThresholdHit;			/* 86 */
-	/*
-	 * DMA Attentions
-	 */
-	volatile u_int32_t nicDmaRdOverrun;			/* 87 */
-	volatile u_int32_t nicDmaRdUnderrun;			/* 88 */
-	volatile u_int32_t nicDmaWrOverrun;			/* 89 */
-	volatile u_int32_t nicDmaWrUnderrun;			/* 90 */
-	volatile u_int32_t nicDmaWrMasterAborts;		/* 91 */
-	volatile u_int32_t nicDmaRdMasterAborts;		/* 92 */
-	/*
-	 * NIC Resources
-	 */
-	volatile u_int32_t nicDmaWriteRingFull;			/* 93 */
-	volatile u_int32_t nicDmaReadRingFull;			/* 94 */
-	volatile u_int32_t nicEventRingFull;			/* 95 */
-	volatile u_int32_t nicEventProducerRingFull;		/* 96 */
-	volatile u_int32_t nicTxMacDescrRingFull;		/* 97 */
-	volatile u_int32_t nicOutOfTxBufSpaceFrameRetry;	/* 98 */
-	volatile u_int32_t nicNoMoreWrDMADescriptors;		/* 99 */
-	volatile u_int32_t nicNoMoreRxBDs;			/* 100 */
-	volatile u_int32_t nicNoSpaceInReturnRing;		/* 101 */
-	volatile u_int32_t nicSendBDs;            /* current count 102 */
-	volatile u_int32_t nicRecvBDs;            /* current count 103 */
-	volatile u_int32_t nicJumboRecvBDs;       /* current count 104 */
-	volatile u_int32_t nicMiniRecvBDs;        /* current count 105 */
-	volatile u_int32_t nicTotalRecvBDs;       /* current count 106 */
-	volatile u_int32_t nicTotalSendBDs;       /* current count 107 */
-	volatile u_int32_t nicJumboSpillOver;			/* 108 */
-	volatile u_int32_t nicSbusHangCleared;			/* 109 */
-	volatile u_int32_t nicEnqEventDelayed;			/* 110 */
-	/*
-	 * Stats from MAC rx completion
-	 */
-	volatile u_int32_t nicMacRxLateColls;			/* 111 */
-	volatile u_int32_t nicMacRxLinkLostDuringPkt;		/* 112 */
-	volatile u_int32_t nicMacRxPhyDecodeErr;		/* 113 */
-	volatile u_int32_t nicMacRxMacAbort;			/* 114 */
-	volatile u_int32_t nicMacRxTruncNoResources;		/* 115 */
-	/*
-	 * Stats from the mac_stats area
-	 */
-	volatile u_int32_t nicMacRxDropUla;			/* 116 */
-	volatile u_int32_t nicMacRxDropMcast;			/* 117 */
-	volatile u_int32_t nicMacRxFlowControl;			/* 118 */
-	volatile u_int32_t nicMacRxDropSpace;			/* 119 */
-	volatile u_int32_t nicMacRxColls;			/* 120 */
-	/*
- 	 * MAC RX Attentions
-	 */
-	volatile u_int32_t nicMacRxTotalAttns;			/* 121 */
-	volatile u_int32_t nicMacRxLinkAttns;			/* 122 */
-	volatile u_int32_t nicMacRxSyncAttns;			/* 123 */
-	volatile u_int32_t nicMacRxConfigAttns;			/* 124 */
-	volatile u_int32_t nicMacReset;				/* 125 */
-	volatile u_int32_t nicMacRxBufDescrAttns;		/* 126 */
-	volatile u_int32_t nicMacRxBufAttns;			/* 127 */
-	volatile u_int32_t nicMacRxZeroFrameCleanup;		/* 128 */
-	volatile u_int32_t nicMacRxOneFrameCleanup;		/* 129 */
-	volatile u_int32_t nicMacRxMultipleFrameCleanup;	/* 130 */
-	volatile u_int32_t nicMacRxTimerCleanup;		/* 131 */
-	volatile u_int32_t nicMacRxDmaCleanup;			/* 132 */
-	/*
-	 * Stats from the mac_stats area
-	 */
-	volatile u_int32_t nicMacTxCollisionHistogram[15];	/* 133 */
-	/*
-	 * MAC TX Attentions
-	 */
-	volatile u_int32_t nicMacTxTotalAttns;			/* 134 */
-	/*
-	 * NIC Profile
-	 */
-	volatile u_int32_t nicProfile[32];			/* 135 */
-	/*
-	 * Pat to 1024 bytes.
-	 */
-	u_int32_t		pad[75];
-};
-/*
  * Tigon general information block. This resides in host memory
  * and contains the status counters, ring control blocks and
  * producer pointers.
@@ -1057,7 +919,11 @@ struct ti_event_desc {
  */
 struct ti_ring_data {
 	struct ti_rx_desc	ti_rx_std_ring[TI_STD_RX_RING_CNT];
+#ifdef PRIVATE_JUMBOS
 	struct ti_rx_desc	ti_rx_jumbo_ring[TI_JUMBO_RX_RING_CNT];
+#else
+	struct ti_rx_desc_ext	ti_rx_jumbo_ring[TI_JUMBO_RX_RING_CNT];
+#endif
 	struct ti_rx_desc	ti_rx_mini_ring[TI_MINI_RX_RING_CNT];
 	struct ti_rx_desc	ti_rx_return_ring[TI_RETURN_RING_CNT];
 	struct ti_event_desc	ti_event_ring[TI_EVENT_RING_CNT];
@@ -1113,7 +979,14 @@ struct ti_jpool_entry {
 	SLIST_ENTRY(ti_jpool_entry)	jpool_entries;
 };
 
+typedef enum {
+	TI_FLAG_NONE		= 0x00,
+	TI_FLAG_DEBUGING	= 0x01,
+	TI_FLAG_WAIT_FOR_LINK	= 0x02
+} ti_flag_vals;
+
 struct ti_softc {
+	STAILQ_ENTRY(ti_softc)	ti_links;
 	struct arpcom		arpcom;		/* interface info */
 	bus_space_handle_t	ti_bhandle;
 	vm_offset_t		ti_vhandle;
@@ -1126,6 +999,7 @@ struct ti_softc {
 	u_int8_t		ti_hwrev;	/* Tigon rev (1 or 2) */
 	u_int8_t		ti_copper;	/* 1000baseTX card */
 	u_int8_t		ti_linkstat;	/* Link state */
+	int			ti_hdrsplit;	/* enable header splitting */
 	struct ti_ring_data	*ti_rdata;	/* rings */
 	struct ti_chain_data	ti_cdata;	/* mbufs */
 #define ti_ev_prodidx		ti_rdata->ti_ev_prodidx_r
@@ -1150,6 +1024,8 @@ struct ti_softc {
 	int			ti_if_flags;
 	int			ti_txcnt;
 	struct mtx		ti_mtx;
+	ti_flag_vals		ti_flags;
+	dev_t			dev;
 };
 
 #define	TI_LOCK(_sc)		mtx_lock(&(_sc)->ti_mtx)