1. 29 Jun, 2022 39 commits
  2. 28 Jun, 2022 1 commit
    • Paolo Abeni's avatar
      Merge branch 'mlxsw-unified-bridge-conversion-part-4-6' · d521bc0a
      Paolo Abeni authored
      Ido Schimmel says:
      
      ====================
      mlxsw: Unified bridge conversion - part 4/6
      
      This is the fourth part of the conversion of mlxsw to the unified bridge
      model.
      
      Unlike previous parts that prepared mlxsw for the conversion, this part
      actually starts the conversion. It focuses on flooding configuration and
      converts mlxsw to the more "raw" APIs of the unified bridge model.
      
      The patches configure the different stages of the flooding pipeline in
      Spectrum that looks as follows (at a high-level):
      
               +------------+                +----------+           +-------+
        {FID,  |            | {Packet type,  |          |           |       |  MID
         DMAC} | FDB lookup |  Bridge type}  |   SFGC   | MID base  |       | Index
      +-------->   (miss)   +----------------> register +-----------> Adder +------->
               |            |                |          |           |       |
               |            |                |          |           |       |
               +------------+                +----+-----+           +---^---+
                                                  |                     |
                                          Table   |                     |
                                           type   |                     | Offset
                                                  |      +-------+      |
                                                  |      |       |      |
                                                  |      |       |      |
                                                  +----->+  Mux  +------+
                                                         |       |
                                                         |       |
                                                         +-^---^-+
                                                           |   |
                                                        FID|   |FID
                                                           |   |offset
                                                           +   +
      
      The multicast identifier (MID) index is used as an index to the port
      group table (PGT) that contains a bitmap of ports via which a packet
      needs to be replicated.
      
      From the PGT table, the packet continues to the multicast port egress
      (MPE) table that determines the packet's egress VLAN. This is a
      two-dimensional table that is indexed by port and switch multicast port
      to egress (SMPE) index. The latter can be thought of as a FID. Without
      it, all the packets replicated via a certain port would get the same
      VLAN, regardless of the bridge domain (FID).
      
      Logically, these two steps look as follows:
      
                           PGT table                           MPE table
                   +-----------------------+               +---------------+
                   |                       | {Local port,  |               | Egress
        MID index  | Local ports bitmap #1 |  SMPE index}  |               |  VID
      +------------>        ...            +--------------->               +-------->
                   | Local ports bitmap #N |               |               |
                   |                       |          SMPE |               |
                   +-----------------------+               +---------------+
                                                              Local port
      
      Patchset overview:
      
      Patch #1 adds a variable to guard against mixed model configuration.
      Will be removed in part 6 when mlxsw is fully converted to the unified
      model.
      
      Patches #2-#5 introduce two new FID attributes required for flooding
      configuration in the new model:
      
      1. 'flood_rsp': Instructs the firmware to handle flooding configuration
      for this FID. Only set for router FIDs (rFIDs) which are used to connect
      a {Port, VLAN} to the router block.
      
      2. 'bridge_type': Allows the device to determine the flood table (i.e.,
      base index to the PGT table) for the FID. The first type will be used
      for FIDs in a VLAN-aware bridge and the second for FIDs representing
      VLAN-unaware bridges.
      
      Patch #6 configures the MPE table that determines the egress VLAN of a
      packet that is forwarded according to L2 multicast / flood.
      
      Patches #7-#11 add the PGT table and related APIs to allocate entries
      and set / clear ports in them.
      
      Patches #12-#13 convert the flooding configuration to use the new PGT
      APIs.
      ====================
      
      Link: https://lore.kernel.org/r/20220627070621.648499-1-idosch@nvidia.comSigned-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
      d521bc0a