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Date: Mon, 21 Jul 2008 22:41:34 +0100
From: Simon Arlott <simon@...e.lp0.eu>
To: netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: e1000 82546EB MSI support
MSI support was added to e1000 a long time ago:
Commit fa4f7ef3aaa6cee6b04ebe90266ee893e0b2ce07 (Wed Nov 1 08:48:10 2006 -0800)
[e1000: MSI support for PCI-e adapters]
+ if(adapter->hw.mac_type > e1000_82547_rev_2) {
+ adapter->have_msi = TRUE;
+ if((err = pci_enable_msi(adapter->pdev))) {
+ DPRINTK(PROBE, ERR,
+ "Unable to allocate MSI interrupt Error: %d\n", err);
+ adapter->have_msi = FALSE;
+ }
+ }
and commit 9ac98284428961bd5be285a6cc1f5e6f5b6644aa (Thu Apr 28 19:39:13 2005 -0700)
[e1000: add dynamic generic MSI interrupt routine]
- if (adapter->hw.mac_type > e1000_82547_rev_2) {
+ if (adapter->hw.mac_type >= e1000_82571) {
Is there are reason why it's only enabled for >= e1000_82571? This isn't explained in
the commit descriptions or in comments (aside from mentioning that the support is for
PCI-e cards).
82546EB appears to support it (lspci below), but I get multiple TX hangs if I enable it:
[ 230.518382] e1000: em0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 230.522873] ADDRCONF(NETDEV_CHANGE): em0: link becomes ready
[ 234.683290] e1000: em0: e1000_clean_tx_irq: Detected Tx Unit Hang
[ 234.683293] Tx Queue <0>
[ 234.683295] TDH <6>
[ 234.683296] TDT <6>
[ 234.683298] next_to_use <6>
[ 234.683299] next_to_clean <4>
[ 234.683300] buffer_info[next_to_clean]
[ 234.683302] time_stamp <fffef59d>
[ 234.683303] next_to_watch <4>
[ 234.683305] jiffies <ffff00db>
[ 234.683306] next_to_watch.status <10>
[ 236.683701] e1000: em0: e1000_clean_tx_irq: Detected Tx Unit Hang
[ 236.683703] Tx Queue <0>
[ 236.683704] TDH <6>
[ 236.683705] TDT <6>
[ 236.683705] next_to_use <6>
[ 236.683706] next_to_clean <4>
[ 236.683707] buffer_info[next_to_clean]
[ 236.683707] time_stamp <fffef59d>
[ 236.683708] next_to_watch <4>
[ 236.683709] jiffies <ffff08ab>
[ 236.683710] next_to_watch.status <10>
[ 238.683697] e1000: em0: e1000_clean_tx_irq: Detected Tx Unit Hang
[ 238.683699] Tx Queue <0>
[ 238.683700] TDH <6>
[ 238.683700] TDT <6>
[ 238.683701] next_to_use <6>
[ 238.683702] next_to_clean <4>
[ 238.683703] buffer_info[next_to_clean]
[ 238.683703] time_stamp <fffef59d>
[ 238.683704] next_to_watch <4>
[ 238.683705] jiffies <ffff107b>
[ 238.683705] next_to_watch.status <10>
It manages to receive a couple of packets sometimes (like IPv6 RAs)...
04:00.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet Controller (Copper) (rev 01)
Subsystem: Intel Corporation PRO/1000 MT Dual Port Server Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64 (63750ns min), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 19
Region 0: Memory at fe9e0000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at dc00 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device
Command: DPERE- ERO+ RBC=512 OST=1
Status: Dev=04:00.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
Capabilities: [f0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Kernel driver in use: e1000
04:00.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet Controller (Copper) (rev 01)
Subsystem: Intel Corporation PRO/1000 MT Dual Port Server Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64 (63750ns min), Cache Line Size: 64 bytes
Interrupt: pin B routed to IRQ 18
Region 0: Memory at fe9c0000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at d880 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device
Command: DPERE- ERO+ RBC=512 OST=1
Status: Dev=04:00.1 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
Capabilities: [f0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Kernel driver in use: e1000
--
Simon Arlott
--
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