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mlxsw: spectrum: Add support in matchall mirror TC offloading

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This patch offloads port mirroring directives to hw using the matchall TC
with action mirror. It includes both the implementation of the
ndo_setup_tc function for the spectrum driver and the spectrum hardware
offload configuration code.

The hardware offload code is basically two new functions which are capable
of adding and removing a new mirror ports pair. It is done using the MPAT,
MPAR and SBIB registers:
 - A new Switch-Port Analyzer (SPAN) entry is added using MPAT to the 'to'
   port.
 - The 'to' port is bound to the SPAN entry using MPAR register.
 - In case of egress SPAN, the 'to' port gets a new internal shared
   buffer using SBIB register.

In addition, a new database was added to the mlxsw_sp struct to store all
the SPAN entries and their bound ports list. The number of supported SPAN
entries is determined by resource query.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yotam Gigi 2016-07-21 12:03:17 +02:00 • committed by David S. Miller
commit 763b4b70af
2 changed files with 507 additions and 1 deletions
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