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52849bcf00
PTP packets with 2-step TX timestamp requests are matched to packets
based on the egress port number and a 6-bit timestamp identifier.
All PTP timestamps are held in a common FIFO that is 128 entry deep.
This patch ensures that back-to-back timestamping requests cannot exceed
the hardware FIFO capacity. If that happens, simply send the packets
without requesting a TX timestamp to be taken (in the case of felix,
since the DSA API has a void return code in ds->ops->port_txtstamp) or
drop them (in the case of ocelot).
I've moved the ts_id_lock from a per-port basis to a per-switch basis,
because we need separate accounting for both numbers of PTP frames in
flight. And since we need locking to inc/dec the per-switch counter,
that also offers protection for the per-port counter and hence there is
no reason to have a per-port counter anymore.
Fixes:
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|---|---|---|
| .. | ||
| arc | ||
| at91 | ||
| bcm2835 | ||
| canaan | ||
| fsl | ||
| imx | ||
| mediatek | ||
| microchip | ||
| mscc | ||
| qcom | ||
| rockchip | ||
| sa1100 | ||
| sifive | ||
| tegra | ||