From: Ido Schimmel <ido...@mellanox.com> A future patch set will add the ability to trap packets that were dropped due to buffer related reasons (e.g., early drop). Internally this is implemented by mirroring these packets towards the CPU port. This patch set adds the required infrastructure to enable such mirroring.
Patches #1-#2 extend two registers needed for above mentioned functionality. Patches #3-#6 gradually add support for setting the mirroring target of a SPAN (mirroring) agent as the CPU port. This is only supported from Spectrum-2 onwards, so an error is returned for Spectrum-1. Patches #7-#8 add the ability to set a policer on a SPAN agent. This is required because unlike regularly trapped packets, a policer cannot be set on the trap group with which the mirroring trap is associated. Patches #9-#12 parse the mirror reason field from the Completion Queue Element (CQE). Unlike other trapped packets, the trap identifier of mirrored packets only indicates that the packet was mirrored, but not why. The reason (e.g., tail drop) is encoded in the mirror reason field. Patch #13 utilizes the mirror reason field in order to lookup the matching Rx listener. This allows us to maintain the abstraction that an Rx listener is mapped to a single trap reason. Without taking the mirror reason into account we would need to register a single Rx listener for all mirrored packets. Amit Cohen (3): mlxsw: reg: Add session_id and pid to MPAT register mlxsw: reg: add mirroring_pid_base to MOGCR register mlxsw: reg: Increase trap identifier to 10 bits Ido Schimmel (10): mlxsw: spectrum_span: Add per-ASIC SPAN agent operations mlxsw: spectrum_span: Add driver private info to parms_set() callback mlxsw: spectrum_span: Do not dereference destination netdev mlxsw: spectrum_span: Add support for mirroring towards CPU port mlxsw: spectrum_span: Allow passing parameters to SPAN agents mlxsw: spectrum_span: Allow setting policer on a SPAN agent mlxsw: trap: Add trap identifiers for mirrored packets mlxsw: pci: Add mirror reason field to CQEv2 mlxsw: pci: Retrieve mirror reason from CQE during receive mlxsw: core: Use mirror reason during Rx listener lookup drivers/net/ethernet/mellanox/mlxsw/core.c | 6 +- drivers/net/ethernet/mellanox/mlxsw/core.h | 2 + drivers/net/ethernet/mellanox/mlxsw/pci.c | 6 +- drivers/net/ethernet/mellanox/mlxsw/pci_hw.h | 7 +- drivers/net/ethernet/mellanox/mlxsw/reg.h | 29 +- .../mlxsw/spectrum_acl_flex_actions.c | 4 +- .../mellanox/mlxsw/spectrum_matchall.c | 6 +- .../ethernet/mellanox/mlxsw/spectrum_qdisc.c | 5 +- .../ethernet/mellanox/mlxsw/spectrum_span.c | 257 ++++++++++++++++-- .../ethernet/mellanox/mlxsw/spectrum_span.h | 17 +- drivers/net/ethernet/mellanox/mlxsw/trap.h | 10 +- 11 files changed, 318 insertions(+), 31 deletions(-) -- 2.26.2
