|
Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
NICBK
Control Block Contents
NICBK DSECT
Cross Reference (Contains links to field and bit definitions)
NICBK Prolog
NAME : HCPNICBK
DESCRIPTION: Virtual Network Interface Card block
DSECT : NICBK
FUNCTION :
Define a structure to represent a Network Interface
Card. One NICBK exists for each Virtual Adapter.
Each NICBK is associated with a set of Virtual
Network Interface Devices (VDEV/NIDBK).
LOCATED BY -
VDEVNIC = Pointer to owning adapter NICBK
NIDNICBK = Pointer to owning adapter NICBK
LNKNICHD = Pointer to chain of coupled adapter NICBK
CREATED BY :
CP DEFINE command processing (module HCPVDB)
DELETED BY :
CP DETACH command processing (module HCPVDB)
REFERENCES :
HCPDVTYP COPY - Specific device types
HCPEQUAT COPY - General CP equates
RELOCATION CONSIDERATIONS : None
COMMENTS :
- Exist in the system execution space.
- Not known by Hardware.
- See Serialization comments in the Assembler section.
NICBK Control Block Content
NICBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure NICBK Virtual Network Interface Card block
Static Area -
The fields in this area are relatively constant.
They are initialized when the adapter (NIC) is
created, and may be referenced with minimal
serialization (just enough to be sure your pointer
to the NICBK is valid).
0000 0 Character 8 NICDESC NIC Description (e.g. HIPER)
0008 8 Bitstring 10 NICOWNBS (0) NIC Owner fields
0008 8 Character 8 NICOWNER NIC Owner VM Userid
0010 16 Signed 2 NICBASE NIC Base Virtual Device Address
0012 18 Signed 2 NICLAST NIC Last Virtual Device Address
0014 20 Signed 2 NICDEVS NIC Device Count
0016 22 Bitstring 1 NICTYPE Network Device Type
00000001 NICHIPR 1 NICHIPR HiperSockets adapter
type
00000002 NICQDIO 2 NICQDIO QDIO adapter type
00000003 NICVSW 3 NICVSW QDIO adapter for
physical UPLINK
00000004 NICINMN 4 NICINMN INMN adapter type
00000005 NICIEDN 5 NICIEDN IEDN adapter type
0017 23 Bitstring 1 NICTRANP Transport type
00000001 NICIP 1 NICIP Layer 3 IP datagrams
00000002 NICETHER 2 NICETHER Layer 2 Ethernet
frames
00000003 NICUNKWN 3 NICUNKWN Unknown NIC type -
never coupled
0018 24 Bitstring 2 NICCUTYP Simulated Control Unit Type
001A 26 Bitstring 1 NICCUMDL Simulated Control Unit Model
001B 27 Bitstring 2 NICDVTYP Simulated Device Type
001D 29 Bitstring 1 NICDVMDL Simulated Device Model
001E 30 Bitstring 1 NICCHPTP CHPID type for this adapter
001F 31 Bitstring 1 NICCHPID CHPID for this adapter
0020 32 Address 4 NICVDEV Host logical Addr of Base VDEV
0024 36 Signed 4 NICMFS MFS (bytes) for current LAN
0028 40 Bitstring 6 NICMAC MAC Address for this adapter
002E 46 Bitstring 2 NICTKUID Latest unique token id
0030 48 Address 4 NICTKLST List of Unique Tokens HL @ of
chain of TKNBKs (See HCPIPY)
NICVLANS represents the Authorized VID set.
When NICVLANS==NULL it means the switch simulation
does not restrict the virtual NIC to any specific
VID set.
When NICVLANS==nonzero it points to the DVLHEAD
structure representing the Authorized VID set for
this virtual NIC on this virtual switch.
0034 52 Address 4 NICVLANS Pointer to list of VLAN groups
0038 56 Signed 2 NICVLCTR Size of Authorized VID set
003A 58 Signed 2 NIC_VIDINST Authorized VLAN instance
003C 60 Address 4 NICVLCPT Pointer to cached VLCBK
NIC Adapter Lock -
Notes : LKWRDSIZ == 3 doublewords.
0040 64 Dbl-Word 8 NICLKWRD (3) Adapter Lockword
Adapter Management Area -
The fields in this area are used in the normal
operation of the adapter (NIC). In general,
these fields are serialized by the NIC Adapter Lock:
- Hold NICLKWRD EXCLUSIVE to update
- Hold NICLKWRD SHARED to reference
NICRFCTR is used to protect the NICBK over a stacked call.
- NICRFCTR is updated using Compare and Swap (CS) logic.
- NICLKWRD (Shared or Exclusive) must be held, or
LANLKWRD (Shared or Exclusive) must be held to update
NICRFCTR.
- The code that intends to initiate a deferred (stacked)
call must increment NICRFCTR (using CS logic).
- The code that is dispatched asynchronously should
perform the following steps:
(1) Obtain NICLKWRD (Shared or Exclusive)
(2) Decrement NICRFCTR (using CS logic).
(3) If NICDLPRG=1 (Delete in Progress),
If NICRFCTR = 0,
Obtain NICLKWRD Exclusive (see HCPLCKSX).
Call HCPNICDX to Destroy this NICBK.
Exit without attempting to release NICLKWRD.
If NICRFCTR > 0,
Release NICLKWRD and exit.
0058 88 Signed 4 NICRFCTR Outstanding Reference count
005C 92 Bitstring 1 NICCFLG Adapter Configuration flags
1... .... NICINPRG X'80' NICINPRG Initialization in
Progress
.1.. .... NICDLPRG X'40' NICDLPRG Delete in Progress
..1. .... NICCNLAN X'20' NICCNLAN Connected to a
SYSTEM LAN
...1 .... NICPVLAN X'10' NICPVLAN Connected to a
PRIVATE LAN
.... 1... NICREADY X'08' NICREADY LAN READY
.... .1.. NICROUTR X'04' NICROUTR NETROUTER is set
(USER DIRECT)
.... ..1. NICPAUT X'02' NICPAUT Promiscuous Mode
Authority
005D 93 Bitstring 1 NICVLFLG VLAN attribute flags
1... .... NICVLGBL X'80' NICVLGBL Global VLAN
(NICPVID) is set
.1.. .... NICVLUSR X'40' NICVLUSR User selects from
NICVLANS list
..1. .... NICVLFLT X'20' NICVLFLT Filter by VID set
...1 .... NICVLNON X'10' NICVLNON No VLAN capability
005E 94 Signed 2 NICPVID Port VLAN ID
0060 96 Address 4 NICNIDHD Host logical address of the first
NIDBK, chained by NIDFPNT/NIDBPNT
0064 100 Address 4 NICNIDTL HL @ of the last NIDBK
0068 104 Signed 4 NICMGPOR (0) Port number and ifIndex
0068 104 Signed 4 NICMGIFI Alternate label
006C 108 Signed 4 NICRPORT Requested port for couple
0070 112 Address 4 NICMSVBK Pointer to NICBASE MSVBK Once set
this is not cleared
Device Specific Area -
0074 116 Bitstring 1 NICQDFMT QDIO Queue Format
0075 117 Bitstring 1 NICVPORT Virtual Port attributes
00000000 NICVPORT_NONE 0 NICVPORT_NONE = Disabled
00000001 NICVPORT_ACCESS
1 NICVPORT_ACCESS = Access Port
(untagged)
00000002 NICVPORT_TRUNK 2 NICVPORT_TRUNK = Trunk Port
(tagged or mix
0076 118 Bitstring 1 NICAFLG Authorization flags
1... .... NICAUTHX X'80' NICAUTHX Authorized by the
ESM
0077 119 Bitstring 9 NICADPTK (0) Adapter Name : Length||Token
0077 119 Bitstring 1 NICADPNL Length of NICADPNM Token
0078 120 Character 8 NICADPNM Adapter Name Token
0080 128 Signed 4 NICMPCCT Count of established MPC groups
0084 132 Address 4 NICMPCHD Host logical address of the first
MPCBK, chained by MPCNEXT/MPCPREV
0088 136 Address 4 NICMPCTL HL @ of the last MPCBK
008C 140 Signed 2 NICMAXIQ Maximum INPUT Queues per MPC
008E 142 Signed 2 NICMAXOQ Maximum OUTPUT Queues per MPC
0090 144 Signed 2 NICIPMAX IP Table Limit for this adapter
0092 146 Signed 2 NICIPCTR IP Table Count for this adapter
0094 148 Bitstring 16 NICDEFIP Default IP Address (accounting)
00A4 164 Signed 2 NICLLMAX IP Table Limit for this adapter
00A6 166 Signed 2 NICLLCTR IP Table Count for this adapter
00A8 168 Address 4 NICPROM Pointer to the NIDBK in PROMISC
00AC 172 Bitstring 1 NICPPCNT Maximum number of ports
00AD 173 Bitstring 1 NICPPORT Configured port number
00AE 174 Bitstring 1 NICLFLG SSI LGR Relocation flags
1... .... NICLGRGA X'80' NICLGRGA - Grat ARP needed
after SETVMAC
00AF 175 Bitstring 3 * Reserved for future IBM use
LGR level/version (NICLGRLV)
Contains the level of the source LGRVDEV data when this
NIC is the subject of a relocation. See also LGRVDEV COPY
which describes which fields are relevant at each version.
Valid when VMDRLFLG bits VMDRLINP+VMDRLOIB are on.
NICLGRLV was first stored with PITS 2U05379 after PITS
2U04209 defined Version 2.
$VDEV_VER = 2 indicates the following fields are passed
to the target:
NICVLANS
NICVLCTR
NICPVID
NICVPORT
LANVLFLT
00B2 178 Signed 2 NICLGRLV Source (NIC)VDEV LGR data version
LAN Management Area -
The fields in this area are used to connect the
adapter (NIC) to a Virtual LAN.
To connect or disconnect this adapter (NIC) to/from
a Virtual LAN, the following locks must be obtained
(in this sequence):
- The LAN Lock (LANLKWRD) EXCLUSIVE
- The NIC Adapter Lock (NICLKWRD) EXCLUSIVE
To reference these fields (e.g. while following
the chain) you only need to hold LANLKWRD SHARED.
- Access to the field NICNCABK and the contents of
the NCABK are serialized by the NICCTRLK.
00B4 180 Address 4 NICFPNT Host logical address of the next
NICBK.
00B8 184 Address 4 NICBPNT Host logical address of the
previous NICBK.
00BC 188 Address 4 NICLANBK Host logical address of the
associated LANBK. If NICCNLAN=1
this is a System LAN. Otherwise
this is the PRIVATE LAN that
represents a disconnected
adapter.
00C0 192 Address 4 NICSIGA SIGA Simulation routine Linkage:
HCPCALL R15 Input/Output: Like
HCPIQQWR TMODEAR or TMODESTD
00C4 196 Address 4 NICNCABK Host logical address of the NCABK
00C8 200 Address 4 NICESMVL ESM VLAN List Pointer
Adapter Router entries.
00CC 204 Address 4 NICRXTBL Pointer to IPNBK(Router) list
00D0 208 Signed 2 NICRXCTR Count of Router entries
00D2 210 Bitstring 6 * Reserved for future IBM use
00D8 216 Address 4 NICVRTBK VSWITCH Routing Table
Adapter Counter LKWRD.
The adapter counter lock word serializes the field
NICNCABK, the contents of the NCABK, and the adapter
counters (starting with NICTXBYT.)
Notes : LKWRDSIZ == 3 doublewords.
00E0 224 Dbl-Word 8 NICCTRLK (3) Adapter Counter Lockword
Adapter Counters.
00F8 248 Dbl-Word 8 NICCTRS (0) Start of NICBK counters
00F8 248 Dbl-Word 8 NICTXBYT Total Bytes Sent
0100 256 Dbl-Word 8 NICRXBYT Total Bytes Received
0108 264 Dbl-Word 8 NICTXPKT (0) TX Packets extracted
0108 264 Signed 4 NICTXPKTHI - High half
010C 268 Signed 4 NICTXPKTLO - Low half
0110 272 Dbl-Word 8 NICTXDSC (0) TX Packets discarded
0110 272 Signed 4 NICTXDSCHI - High half
0114 276 Signed 4 NICTXDSCLO - Low half
0118 280 Dbl-Word 8 NICTXERR (0) TX Bad Packets discarded
0118 280 Signed 4 NICTXERRHI - High half
011C 284 Signed 4 NICTXERRLO - Low half
0120 288 Dbl-Word 8 NICRXPKT (0) RX Packets received
0120 288 Signed 4 NICRXPKTHI - High half
0124 292 Signed 4 NICRXPKTLO - Low half
0128 296 Dbl-Word 8 NICRXDSC (0) RX Packets discarded/overflow
0128 296 Signed 4 NICRXDSCHI - High half
012C 300 Signed 4 NICRXDSCLO - Low half
0130 304 Dbl-Word 8 NICRXERR (0) RX Bad Packets discarded
0130 304 Signed 4 NICRXERRHI - High half
0134 308 Signed 4 NICRXERRLO - Low half
Adapter Counters (Continue)
The following set of counters are used to keep track of a
specific port's attempt to acquire key locks or queue work
in the main line data transfer path. In addition to
keeping track of the lock requests, a corresponding
counter will indicate the number of times the port had to
wait to perform the function.
The following information is kept on a per port basis,
including both real and virtual guest LAN ports:
LANBK (LANLKWR) lock requests sending or receiving data.
NICBK (NICLKWD) lock requests when sending data to
another port.
NICBK (NICLKWD) lock requests when receiving data from
another port.
Queueing and removing work (NDMBKs) on a target's port
0138 312 Dbl-Word 8 NIC_LOCKREQS LANBK lock request
0140 320 Dbl-Word 8 NIC_LANDEFER LANBK lock deferrals
0148 328 Dbl-Word 8 NIC_TXREQS NICBK lock requests sending data
0150 336 Dbl-Word 8 NIC_TXDEFERS NICBK lock deferrals sending data
0158 344 Dbl-Word 8 NIC_RXREQS NICBK lock requests receiving
data
0160 352 Dbl-Word 8 NIC_RXDEFERS NICBK lock deferrals receiving
data
0168 360 Dbl-Word 8 NIC_STKREQS Number of times we queued work on
a target port
0170 368 Dbl-Word 8 NIC_STKDEFERS Times it took multiple attempts
to queue work on a target port
0178 376 Dbl-Word 8 NIC_SESRXPCI Count of PCI (or AIF) events
reflected for input queues.
0180 384 Dbl-Word 8 NIC_SESTXPCI Count of PCI (or AIF) events
reflected for output queues.
00000090 NICCTRLN *-NICCTRS Length of NICBK
counters
Pointer to structure of vlan counters (VLCBK)
Will contain:
Pointer back to owning NICBK (A or AD)
and 3 double word counters:
# of Frames IN (VLCIN)
# of Frames OUT (VLCOUT)
# of Frames IN Discarded (VLCINDSC)
# of Frames OUT Discarded (VLCOUTDC)
For each VLAN (1-4094)
0188 392 Dbl-Word 8 NICCTRVL (4) Reserve a MLTBK here
01A8 424 Bitstring 4 * Reserved for IBM use
DEDICATE_ADAPTER simulation.
01AC 428 Bitstring 1 NICHWDED DEDICATE_ADAPTER status
1... .... NICHWDED_ON X'80' NICHWDED_ON - Adapter is
dedicated now
01AD 429 Bitstring 1 * Reserved for IBM use
01AE 430 Signed 2 NICDEDUA Unit Address (offset) of owner
01B0 432 Bitstring 6 NICDEDMA ExclusiveUsageMAC
01B6 438 Bitstring 2 * Reserved for IBM use
01B8 440 Bitstring 8 NICDEDID ExclusiveUsageID
End of the NICBK.
01C0 448 Dbl-Word 8 NIC$END (0) End of the NICBK structure
000001C0 NICBKLN *-NICBK Length of NICBK in bytes
00000038 NICBKSZ (*-NICBK+7)/8 Size of NICBK in
doublewords
Related constants.
00000100 NICMAXDV 256 Max Network Devices per NIC
00000010 NICMAXNT 16 Max Network Ports per NIC -
QDIO
Define MLTBK for this compile.
PREFIX_LEN = 3
Start of Assembler Control Block
NICBK Storage Layout
*** NICBK - Virtual Network Interface Card block
*
* +-------------------------------------------------------+
* 0 | NICDESC |
* +-------------------------------------------------------+
* 8 | NICOWNER |
* +-------------+-------------+-------------+------+------+
* 10 | NICBASE | NICLAST | NICDEVS |:TYPE |:TRANP|
* +-------------+------+------+------+------+------+------+
* 18 | NICCUTYP |:CUMDL| NICDVTYP |:DVMDL|:CHPTP|:CHPID|
* +-------------+------+------+------+------+------+------+
* 20 | NICVDEV | NICMFS |
* +---------------------------+-------------+-------------+
* 28 | NICMAC | NICTKUID |
* +---------------------------+-------------+-------------+
* 30 | NICTKLST | NICVLANS |
* +-------------+-------------+---------------------------+
* 38 | NICVLCTR |NIC_VIDINST | NICVLCPT |
* +-------------+-------------+---------------------------+
* 40 | |
* = NICLKWRD =
* | |
* +---------------------------+------+------+-------------+
* 58 | NICRFCTR |:CFLG |:VLFLG| NICPVID |
* +---------------------------+------+------+-------------+
* 60 | NICNIDHD | NICNIDTL |
* +---------------------------+---------------------------+
* 68 | NICMGIFI | NICRPORT |
* +---------------------------+------+------+------+------+
* 70 | NICMSVBK |:QDFMT|:VPORT|:AFLG |:ADPNL|
* +---------------------------+------+------+------+------+
* 78 | NICADPNM |
* +---------------------------+---------------------------+
* 80 | NICMPCCT | NICMPCHD |
* +---------------------------+-------------+-------------+
* 88 | NICMPCTL | NICMAXIQ | NICMAXOQ |
* +-------------+-------------+-------------+-------------+
* 90 | NICIPMAX | NICIPCTR | |
* +-------------+-------------+ |
* | NICDEFIP |
* | +-------------+-------------+
* A0 | | NICLLMAX | NICLLCTR |
* +---------------------------+------+------+------+------+
* A8 | NICPROM |:PPCNT|:PPORT|:LFLG |//////|
* +-------------+-------------+------+------+------+------+
* B0 |/////////////| NICLGRLV | NICFPNT |
* +-------------+-------------+---------------------------+
* B8 | NICBPNT | NICLANBK |
* +---------------------------+---------------------------+
* C0 | NICSIGA | NICNCABK |
* +---------------------------+---------------------------+
* C8 | NICESMVL | NICRXTBL |
* +-------------+-------------+---------------------------+
* D0 | NICRXCTR |/////////////////////////////////////////|
* +-------------+-------------+---------------------------+
* D8 | NICVRTBK |///////////////////////////|
* +---------------------------+---------------------------+
* E0 | |
* = NICCTRLK =
* | |
* +-------------------------------------------------------+
* F8 | NICTXBYT |
* +-------------------------------------------------------+
* 100 | NICRXBYT |
* +---------------------------+---------------------------+
* 108 | NICTXPKTHI | NICTXPKTLO |
* +---------------------------+---------------------------+
* 110 | NICTXDSCHI | NICTXDSCLO |
* +---------------------------+---------------------------+
* 118 | NICTXERRHI | NICTXERRLO |
* +---------------------------+---------------------------+
* 120 | NICRXPKTHI | NICRXPKTLO |
* +---------------------------+---------------------------+
* 128 | NICRXDSCHI | NICRXDSCLO |
* +---------------------------+---------------------------+
* 130 | NICRXERRHI | NICRXERRLO |
* +---------------------------+---------------------------+
* 138 | NIC_LOCKREQS |
* +-------------------------------------------------------+
* 140 | NIC_LANDEFER |
* +-------------------------------------------------------+
* 148 | NIC_TXREQS |
* +-------------------------------------------------------+
* 150 | NIC_TXDEFERS |
* +-------------------------------------------------------+
* 158 | NIC_RXREQS |
* +-------------------------------------------------------+
* 160 | NIC_RXDEFERS |
* +-------------------------------------------------------+
* 168 | NIC_STKREQS |
* +-------------------------------------------------------+
* 170 | NIC_STKDEFERS |
* +-------------------------------------------------------+
* 178 | NIC_SESRXPCI |
* +-------------------------------------------------------+
* 180 | NIC_SESTXPCI |
* +-------------------------------------------------------+
* 188 | |
* = NICCTRVL =
* | |
* +---------------------------+------+------+-------------+
* 1A8 |///////////////////////////|:HWDED|//////| NICDEDUA |
* +---------------------------+------+------+-------------+
* 1B0 | NICDEDMA |/////////////|
* +-----------------------------------------+-------------+
* 1B8 | NICDEDID |
* +-------------------------------------------------------+
*
*** NICBK - Virtual Network Interface Card block
NICBK Cross Reference
Symbol Dspl Value -------------- ---- ----- NIC$END 01C0 NIC_LANDEFER 0140 NIC_LOCKREQS 0138 NIC_RXDEFERS 0160 NIC_RXREQS 0158 NIC_SESRXPCI 0178 NIC_SESTXPCI 0180 NIC_STKDEFERS 0170 NIC_STKREQS 0168 NIC_TXDEFERS 0150 NIC_TXREQS 0148 NIC_VIDINST 003A NICADPNL 0077 NICADPNM 0078 NICADPTK 0077 NICAFLG 0076 NICAUTHX 0076 80 NICBASE 0010 NICBKLN 01C0 000001C0 NICBKSZ 01C0 00000038 NICBPNT 00B8 NICCFLG 005C NICCHPID 001F NICCHPTP 001E NICCNLAN 005C 20 NICCTRLK 00E0 NICCTRLN 0180 00000090 NICCTRS 00F8 NICCTRVL 0188 NICCUMDL 001A NICCUTYP 0018 NICDEDID 01B8 NICDEDMA 01B0 NICDEDUA 01AE NICDEFIP 0094 NICDESC 0000 NICDEVS 0014 NICDLPRG 005C 40 NICDVMDL 001D NICDVTYP 001B NICESMVL 00C8 NICETHER 0017 00000002 NICFPNT 00B4 NICHIPR 0016 00000001 NICHWDED 01AC NICHWDED_ON 01AC 80 NICIEDN 0016 00000005 NICINMN 0016 00000004 NICINPRG 005C 80 NICIP 0017 00000001 NICIPCTR 0092 NICIPMAX 0090 NICLANBK 00BC NICLAST 0012 NICLFLG 00AE NICLGRGA 00AE 80 NICLGRLV 00B2 NICLKWRD 0040 NICLLCTR 00A6 NICLLMAX 00A4 NICMAC 0028 NICMAXDV 01C0 00000100 NICMAXIQ 008C NICMAXNT 01C0 00000010 NICMAXOQ 008E NICMFS 0024 NICMGIFI 0068 NICMGPOR 0068 NICMPCCT 0080 NICMPCHD 0084 NICMPCTL 0088 NICMSVBK 0070 NICNCABK 00C4 NICNIDHD 0060 NICNIDTL 0064 NICOWNBS 0008 NICOWNER 0008 NICPAUT 005C 02 NICPPCNT 00AC NICPPORT 00AD NICPROM 00A8 NICPVID 005E NICPVLAN 005C 10 NICQDFMT 0074 NICQDIO 0016 00000002 NICREADY 005C 08 NICRFCTR 0058 NICROUTR 005C 04 NICRPORT 006C NICRXBYT 0100 NICRXCTR 00D0 NICRXDSC 0128 NICRXDSCHI 0128 NICRXDSCLO 012C NICRXERR 0130 NICRXERRHI 0130 NICRXERRLO 0134 NICRXPKT 0120 NICRXPKTHI 0120 NICRXPKTLO 0124 NICRXTBL 00CC NICSIGA 00C0 NICTKLST 0030 NICTKUID 002E NICTRANP 0017 NICTXBYT 00F8 NICTXDSC 0110 NICTXDSCHI 0110 NICTXDSCLO 0114 NICTXERR 0118 NICTXERRHI 0118 NICTXERRLO 011C NICTXPKT 0108 NICTXPKTHI 0108 NICTXPKTLO 010C NICTYPE 0016 NICUNKWN 0017 00000003 NICVDEV 0020 NICVLANS 0034 NICVLCPT 003C NICVLCTR 0038 NICVLFLG 005D NICVLFLT 005D 20 NICVLGBL 005D 80 NICVLNON 005D 10 NICVLUSR 005D 40 NICVPORT 0075 NICVPORT_ACCESS 0075 00000001 NICVPORT_NONE 0075 00000000 NICVPORT_TRUNK 0075 00000002 NICVRTBK 00D8 NICVSW 0016 00000003
Copyright IBM Corporation, 1990, 2011