Migrating io-sock networking drivers with PTP to QNX SDP 8.0.1 io-sock

• Removed the following commands:
  • PTP_GET_TX_TIMESTAMP
  • PTP_GET_RX_TIMESTAMP
• Moved the definition of ETHERTYPE_PTP to net/ethernet.h.
• Changed the definition of PTP_PORT to PTP_PORT_EVENT.
• Changed the name of ptp_comp_t to struct ptp_comp.
• Changed the name of ptp_time_t to struct ptp_time, and the structure's sec member to an int64_t.
• Replaced ptp_extts_t with struct ptp_tstmp.
• Added qnx/ptp/ptp_mod.h for PTP module functions.

TX/RX timestamp handling should no longer have a per-driver implementation. Instead, use the ptp_*() module functions as described in "Adding PTP to io-sock Network Drivers." Because all software timestamp queueing is now managed by the PTP module, a driver does not have to store information specific to a packet to be retrieved. Drivers no longer need to use ptp_extts_t, meaning struct ptp_tstmp should only be seen by the user. This change coincides with the removal of the PTP_GET_TX_TIMESTAMP and PTP_GET_RX_TIMESTAMP commands.

Note: No PTP packet processing should be necessary with the PTP module.

The PTP_* devctl() commands are still sent with a SIOCGDRVSPEC or SIOCSDRVSPEC command, but ptp_ioctl() should be called to process the PTP_* commands. The PTP module then calls the DEVMETHOD() functions that the driver has set up, as described in the "Adding PTP to io-sock Network Drivers."

When the driver uses the ptp_*() functions, the PTP module calculates the upper portion of the 64-bit sec member of struct ptp_time. The driver should not attempt to calculate a number of seconds greater than the maximum specified by the max member of ptp_attach().