e1000: emulate auto-negotiation during external link status change
This patch emulates auto-negotiation when the network link status is modified externally (i.e. via "set_link <id> off/on"). Also, a couple of cleanup items: - unset PHY status reg. AUTONEG_COMPLETE during link_down() - set PHY status reg. AUTONEG_COMPLETE during autoneg_timer() only if we actually brought the link up. - group all checks for "can we, and should we autonegotiate?" together for more clarity. Signed-off-by: NGabriel Somlo <somlo@cmu.edu> Reviewed-by: NAlexander Graf <agraf@suse.de> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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