2014-05-07 18:28 GMT+02:00 Chris Cappuccio <ch...@nmedia.net>: > Donovan Watteau [tso...@gmail.com] wrote: >> Hi, >> >> Is there a way to force the disabling of flow control on em(4)? >> >> Henning said (http://marc.info/?l=openbsd-misc&m=123003276308084&w=2): >> > flow control is enabled on openbsd whenever the peer supports it; done >> > in the autonegotiation phase. there is no button to turn it off. why >> > should there? >> >> But in my case, although flow control is disabled and auto-negociation >> is enabled on the Cisco side, "rxpause,txpause" still appears in >> ifconfig(8). >> >> However, looking at /sys/dev/pci/if_em_hw.c, it looks like "software >> [can] manually configure flow control". This makes me think of >> dev.em.X.fc on FreeBSD, but I don't think there's an equivalent on >> OpenBSD. >> >> Is there a not-too-gruesome way of disabling flow control on em(4)? >> Or a define to tweak in if_em_hw.h or something? >> > > If you don't want to edit the driver, you can simply disable media > autoselection by forcing speed and duplex. The switch will require > forced speed and duplex. ifconfig em0 media 1000baseT mediaopt full-duplex > for instance.
Yes, but I want to explicitly configure flow control, not speed or duplex. AFAIK this can't be forced with mediaopt. And forcing speed/duplex doesn't have any effect on the status of flow control.
