intel/ixgbe/ixgbe_ptp.c

19  * nanoseconds the cyclecounter and timecounter structures are
84  * which contain measurements of seconds and nanoseconds respectively. This
89  * represents units of 2^-32 nanoseconds, and uses 31 bits for this, with the
92  * of 12 to 13 nanoseconds adjustment. Unlike the 82599 and X540 devices, the
103  * seconds, 32 bits for nanoseconds (largest value is 0d999999999 or just under
129  * 12.5 nanoseconds. This means that the Max ppb is 39999999
131  *         register can only hold slightly under 0.5 nanoseconds.
140  * proper mult and shift to convert the cycles into nanoseconds of time.
206 	/* Figure out how many nanoseconds to add to round the clock edge up  in ixgbe_ptp_setup_sdp_X540()
289 	/* Figure out how many nanoseconds to add to round the clock edge up  in ixgbe_ptp_setup_sdp_X550()
299 	 * nanoseconds. However, we can use the math from a timespec64 to  in ixgbe_ptp_setup_sdp_X550()
324  * structure to convert from internal representation into nanoseconds. We need
327  * "cycles", rather than seconds and nanoseconds.
338 	 * cycles are not guaranteed to be nanoseconds. The timespec64 created  in ixgbe_ptp_read_X550()
408 	 * and nanoseconds counter, instead of raw 64bits nanoseconds. We need  in ixgbe_ptp_convert_to_hwtstamp()
412 	 * not represent seconds/nanoseconds. Instead it can be thought of as  in ixgbe_ptp_convert_to_hwtstamp()
1162 	 * to nanoseconds using only a multiplier and a right-shift,  in ixgbe_ptp_link_speed_adjust()
1223 		 * designed to represent seconds and nanoseconds when this is  in ixgbe_ptp_start_cyclecounter()