在我的系统上（OpenSUSE 11.4 - 内核 2.6.37）是否配置表示不同的中断号eth0比 proc aqd sys 文件系统。
ifconfig 指示 17：
linux-3e1w:~ # ifconfig
eth0 Link encap:Ethernet HWaddr 00:22:19:F5:0E:2D
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:17
proc fs 指示 43：
linux-3e1w:~ # cat /proc/interrupts
CPU0 CPU1
0: 6340443 635232 IO-APIC-edge timer
1: 5100 940 IO-APIC-edge i8042
..........
17: 185626 257326 IO-APIC-fasteoi firewire_ohci, b43
43: 1 2 PCI-MSI-edge eth0
........
NMI: 483 2065 Non-maskable interrupts
LOC: 3140034 5437332 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 483 2065 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RES: 230706 229157 Rescheduling interrupts
CAL: 10511 11305 Function call interrupts
TLB: 24196 26573 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 72 70 Machine check polls
ERR: 9
MIS: 0
sys fs 指示 43：
linux-3e1w:~ # cat /sys/class/net/eth0/device/irq
43
你能解释一下吗？
更新：
irq 17 输出的相关部分lspci -vv（属于wlan0而不是eth0)：
04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Subsystem: Dell Wireless 1397 WLAN Mini-Card
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 17
Region 0: Memory at f8000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-
Capabilities: [58] Vendor Specific Information: Len=78 <?>
Capabilities: [e8] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [d0] Express (v1) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
....................
....................
lspci -vvirq 43 输出的相关部分：
08:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
Subsystem: Dell Device 02be
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 43
Region 0: Memory at fc500000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [48] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [40] Vital Product Data
Product Name: Broadcom NetLink Gigabit Ethernet Controller
Read-only fields:
[PN] Part number: BCM95784M
[EC] Engineering changes: 106679-15
[SN] Serial number: 0123456789
[MN] Manufacture ID: 31 34 65 34
[RV] Reserved: checksum good, 25 byte(s) reserved
End
Capabilities: [60] Vendor Specific Information: Len=6c <?>
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Address: 00000000fee0300c Data: 41c9
Capabilities: [cc] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <1us, L1 <64us
ClockPM+ Surprise- LLActRep- BwNot-
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range ABCD, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr+ BadTLP+ BadDLLP+ Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Capabilities: [13c v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=01
Status: NegoPending- InProgress-
Capabilities: [160 v1] Device Serial Number 00-22-19-ff-fe-f5-0e-2d
Capabilities: [16c v1] Power Budgeting <?>
Kernel driver in use: tg3
答案1
您的卡正在运行MSI 中断模式，而不是传统 PCI 模式。ifconfig显示 PCI 配置分配给您的卡的传统中断号，而不是分配的 MSI 号pci_enable_msi。
确切原因可以在tg3驱动程序中看到。驱动程序将旧式 PCI irq 复制到netdev结构中在探测时。这是看到的号码ifconfig。然后司机在设备打开时启用 MSI，改变 IRQ 编号。
（中断和 I/O 地址与当前硬件上的用户空间是否有任何关联值得怀疑。这些信息可以ifconfig追溯到 ISA 时期，当时我们使用跳线设置卡中断。我们现在只有在调试驱动程序时才真正需要这些信息。）