• Petr Machata's avatar
    mlxsw: spectrum: PTP: Hook into packet receive path · aed4b572
    Petr Machata authored
    When configured, the Spectrum hardware can recognize PTP packets and
    trap them to the CPU using dedicated traps, PTP0 and PTP1.
    
    One reason to get PTP packets under dedicated traps is to have a
    separate policer suitable for the amount of PTP traffic expected when
    switch is operated as a boundary clock. For this, add two new trap
    groups, MLXSW_REG_HTGT_TRAP_GROUP_SP_PTP0 and _PTP1, and associate the
    two PTP traps with these two groups.
    
    In the driver, specifically for Spectrum-1, event PTP packets will need
    to be paired up with their timestamps. Those arrive through a different
    set of traps, added later in the patch set. To support this future use,
    introduce a new PTP op, ptp_receive.
    
    It is possible to configure which PTP messages should be trapped under
    which PTP trap. On Spectrum systems, we will use PTP0 for event
    packets (which need timestamping), and PTP1 for control packets (which
    do not). Thus configure PTP0 trap with a custom callback that defers to
    the ptp_receive op.
    
    Additionally, L2 PTP packets are actually trapped through the LLDP trap,
    not through any of the PTP traps. So treat the LLDP trap the same way as
    the PTP0 trap. Unlike PTP traps, which are currently still disabled,
    LLDP trap is active. Correspondingly, have all the implementations of
    the ptp_receive op return true, which the handler treats as a signal to
    forward the packet immediately.
    Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
    Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
    Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    aed4b572
reg.h 302 KB