net: mscc: ocelot: make struct ocelot_stat_layout array indexable
The ocelot counters are 32-bit and require periodic reading, every 2 seconds, by ocelot_port_update_stats(), so that wraparounds are detected. Currently, the counters reported by ocelot_get_stats64() come from the 32-bit hardware counters directly, rather than from the 64-bit accumulated ocelot->stats, and this is a problem for their integrity. The strategy is to make ocelot_get_stats64() able to cherry-pick individual stats from ocelot->stats the way in which it currently reads them out from SYS_COUNT_* registers. But currently it can't, because ocelot->stats is an opaque u64 array that's used only to feed data into ethtool -S. To solve that problem, we need to make ocelot->stats indexable, and associate each element with an element of struct ocelot_stat_layout used by ethtool -S. This makes ocelot_stat_layout a fat (and possibly sparse) array, so we need to change the way in which we access it. We no longer need OCELOT_STAT_END as a sentinel, because we know the array's size (OCELOT_NUM_STATS). We just need to skip the array elements that were left unpopulated for the switch revision (ocelot, felix, seville). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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