const golang.org/x/sys/unix.ETHTOOL_A_LINKSTATE_EXT_DOWN_CNT

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L3946: 	ETHTOOL_A_LINKSTATE_EXT_DOWN_CNT          = 0x7

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)