net: microchip: sparx5: add support for PCP rewrite
Add support for rewrite of PCP and DEI, based on classified Quality of
Service (QoS) class and Drop-Precedence (DP) level.
The DCB rewrite table is queried for mappings between priority and
PCP/DEI. The classified DP level is then encoded in the DEI bit, if a
mapping for DEI exists.
Sparx5 has four DP levels, where by default, 0 is mapped to DE0 and 1-3
are mapped to DE1. If a mapping exists where DEI=1, then all classified
DP levels mapped to DE1 will set the DEI bit. The other way around for
DEI=0. Effectively, this means that the tagged DEI bit will reflect the
DP level for any mappings where DEI=1.
Map priority=1 to PCP=1 and DEI=1:
$ dcb rewr add dev eth0 pcp-prio 1:1de
Map priority=7 to PCP=2 and DEI=0
$ dcb rewr add dev eth0 pcp-prio 7:2nd
Also, sparx5_dcb_ieee_dscp_setdel() has been refactored, to work for
both APP and rewrite entries.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>