fxp entering promiscuous mode causing link to bounce

[Mike Tancsa]

I dont recall seeing this on RELENG_7, but I dont have a box to test with anymore confirm. On one box I upgraded to RELENG_8 I just noticed the nic will bounce if I enable tcpdump on it.  Sure enough, trying on a different RELENG_8 box with an fxp nic shows the same result.

eg

tcpdump -ni fxp0 -c 20

fxp0: link state changed to DOWN
fxp0: promiscuous mode enabled
fxp0: link state changed to UP
fxp0: link state changed to DOWN
fxp0: promiscuous mode disabled
fxp0: link state changed to UP

I verified it on 2 different boxes. Is there a way to prevent this from happening ?


fxp0 at pci0:0:7:0:        class=0x020000 card=0x000b8086 chip=0x12298086 rev=0x08 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class      = network
    subclass   = ethernet
    bar   [10] = type Memory, range 32, base 0xfebbb000, size 4096, enabled
    bar   [14] = type I/O Port, range 32, base 0xd800, size 64, enabled
    bar   [18] = type Memory, range 32, base 0xfe900000, size 1048576, enabled
    cap 01[dc] = powerspec 2  supports D0 D1 D2 D3  current D0


and

fxp0 at pci0:2:1:0:        class=0x020000 card=0x00408086 chip=0x12298086 rev=0x0c hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class      = network
    subclass   = ethernet
    bar   [10] = type Memory, range 32, base 0xfddff000, size 4096, enabled
    bar   [14] = type I/O Port, range 32, base 0xdf00, size 64, enabled
    bar   [18] = type Memory, range 32, base 0xfddc0000, size 131072, enabled
    cap 01[dc] = powerspec 2  supports D0 D1 D2 D3  current D0



fxp0: <Intel 82550 Pro/100 Ethernet> port 0xdf00-0xdf3f mem 0xfddff000-0xfddfffff,0xfddc0000-0xfdddffff irq 21 at device 1.0 on pci2
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> PHY 1 on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto, auto-flow
fxp0: Ethernet address: 00:02:b3:5d:ca:f6
fxp0: [ITHREAD]

and

fxp0: <Intel 82559 Pro/100 Ethernet> port 0xd800-0xd83f mem 0xfebbb000-0xfebbbfff,0xfe900000-0xfe9fffff irq 27 at device 7.0 on pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> PHY 1 on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto, auto-flow
fxp0: Ethernet address: 00:d0:b7:db:5f:22
fxp0: [ITHREAD]

dev.fxp.0.%desc: Intel 82550 Pro/100 Ethernet
dev.fxp.0.%driver: fxp
dev.fxp.0.%location: slot=1 function=0
dev.fxp.0.%pnpinfo: vendor=0x8086 device=0x1229 subvendor=0x8086 subdevice=0x0040 class=0x020000
dev.fxp.0.%parent: pci2
dev.fxp.0.int_delay: 1000
dev.fxp.0.bundle_max: 6
dev.fxp.0.rnr: 61
dev.fxp.0.stats.rx.good_frames: 1085200818
dev.fxp.0.stats.rx.crc_errors: 0
dev.fxp.0.stats.rx.alignment_errors: 0
dev.fxp.0.stats.rx.rnr_errors: 0
dev.fxp.0.stats.rx.overrun_errors: 319
dev.fxp.0.stats.rx.cdt_errors: 0
dev.fxp.0.stats.rx.shortframes: 0
dev.fxp.0.stats.rx.pause: 0
dev.fxp.0.stats.rx.controls: 0
dev.fxp.0.stats.rx.tco: 0
dev.fxp.0.stats.tx.good_frames: 1105041142
dev.fxp.0.stats.tx.maxcols: 0
dev.fxp.0.stats.tx.latecols: 0
dev.fxp.0.stats.tx.underruns: 0
dev.fxp.0.stats.tx.lostcrs: 149
dev.fxp.0.stats.tx.deffered: 0
dev.fxp.0.stats.tx.single_collisions: 0
dev.fxp.0.stats.tx.multiple_collisions: 0
dev.fxp.0.stats.tx.total_collisions: 0
dev.fxp.0.stats.tx.pause: 0
dev.fxp.0.stats.tx.tco: 0


-- 
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada   http://www.tancsa.com/