On Fri, Jul 29, 2016 at 4:37 PM, Dominic Curran <dominic.cur...@citrix.com> wrote: > Hi > > This question refers to igb codebase. > I have a question regarding the setting of hw->mac.autoneg. > > Is it correct to say for igb driver: > "if speed=1000 and duplex=FULL and media_type=COPPER then only > auto-negotiate enable is supported" > > i.e. > with these settings (speed/duplex/media_type) then auto-negotiate can > _not_ be disabled. Correct ? > > I say this for two reasons: > 1) The code in igb_set_spd_dplx() seems to indicate it: > > case SPEED_1000 + DUPLEX_FULL: > mac->autoneg = 1; > adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL; > break; > > 2) Instrumenting the driver, I always see the autoneg code in > e1000_check_for_copper_link_generic() get called after an igb_reset(). > > > Have i understood correctly ? > > thanks in advance > dom
If you are using copper then you are likely referring to 1000Base-T correct? If so then autonegotation is a requirement. Here is the wikipedia URL that refers to this: https://en.wikipedia.org/wiki/Gigabit_Ethernet#1000BASE-T Hope this helps to clear it up. Thanks. - Alex
