Lines Matching refs:timestamping
24 Same timestamping mechanism as SO_TIMESTAMP, but reports the
45 This socket option enables timestamping of datagrams on the reception
98 requested by a particular socket, such as when receive timestamping is
171 have multiple concurrent timestamping requests outstanding. Packets
284 The SO_TIMESTAMPING interface supports timestamping of bytes in a
286 entire contents of the buffer has passed a timestamping point. That
582 and hardware timestamping is not possible (SKBTX_IN_PROGRESS not set).
599 user to select which PHC to use for timestamping Ethernet frames. Instead, the
617 switches include a timestamping clock of their own, and have the ability to
618 perform network timestamping on their own MAC, such that path delays only
625 By design, PTP timestamping with a DSA switch does not need any special
627 host port also supports PTP timestamping, DSA will take care of intercepting
629 hardware timestamping on it. This is because the SO_TIMESTAMPING API does not
634 timestamping:
637 packets with a hardware TX timestamping request from user space.
638 This is required for two-step timestamping, since the hardware
649 packets in a queue waiting for timestamping and the actual timestamps,
655 One-step TX timestamping do not require packet cloning, since there is
668 (through another RX timestamping FIFO). Deferral on RX is typically
682 A PHY driver that supports PTP timestamping must create a ``struct
686 Since PHYs do not have network interface representations, the timestamping and
689 to each individual MAC driver for PHY timestamping support. This entails:
702 deferral for RX timestamping is necessary. Again like DSA, it becomes the
716 drivers already perform for software timestamping purposes. Therefore, if a
717 MAC supports software timestamping, it does not need to do anything further
723 These perform the same role as timestamping Ethernet PHYs, save for the fact
725 any PHY even if it doesn't support timestamping. In Linux, they are
741 Any TX timestamping logic, be it a plain MAC driver, a DSA switch driver, a PHY
746 For example, a typical driver design for TX timestamping might be to split the
749 1. "TX": checks whether PTP timestamping has been previously enabled through
770 that PTP timestamping is not enabled for anything other than the outermost PHC,