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net: mscc: ocelot: issue a warning if stats are incorrectly ordered 

Ocelot uses regmap_bulk_read() operations to efficiently read stats
registers. Currently the implementation relies on the stats layout to be
ordered to be most efficient.

Issue a warning if any future implementations happen to break this pattern.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Co-developed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Colin Foster 2022-11-19 15:14:06 -08:00 committed by Paolo Abeni
parent a3bb8f521f
commit 877e7b7c3b
1 changed files with 7 additions and 1 deletions
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8
drivers/net/ethernet/mscc/ocelot_stats.c
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@ -602,7 +602,7 @@ EXPORT_SYMBOL(ocelot_port_get_stats64);
static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
{
struct ocelot_stats_region *region = NULL;
unsigned int last;
unsigned int last = 0;
int i;
INIT_LIST_HEAD(&ocelot->stats_regions);
@ -619,6 +619,12 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
if (!region)
return -ENOMEM;
/* enum ocelot_stat must be kept sorted in the same
* order as ocelot_stats_layout[i].reg in order to have
* efficient bulking
*/
WARN_ON(last >= ocelot_stats_layout[i].reg);
region->base = ocelot_stats_layout[i].reg;
region->count = 1;
list_add_tail(&region->node, &ocelot->stats_regions);