• Shani Michaeli's avatar
    IB/core: Add "type 2" memory windows support · 7083e42e
    Shani Michaeli authored
    This patch enhances the IB core support for Memory Windows (MWs).
    
    MWs allow an application to have better/flexible control over remote
    access to memory.
    
    Two types of MWs are supported, with the second type having two flavors:
    
        Type 1  - associated with PD only
        Type 2A - associated with QPN only
        Type 2B - associated with PD and QPN
    
    Applications can allocate a MW once, and then repeatedly bind the MW
    to different ranges in MRs that are associated to the same PD. Type 1
    windows are bound through a verb, while type 2 windows are bound by
    posting a work request.
    
    The 32-bit memory key is composed of a 24-bit index and an 8-bit
    key. The key is changed with each bind, thus allowing more control
    over the peer's use of the memory key.
    
    The changes introduced are the following:
    
    * add memory window type enum and a corresponding parameter to ib_alloc_mw.
    * type 2 memory window bind work request support.
    * create a struct that contains the common part of the bind verb struct
      ibv_mw_bind and the bind work request into a single struct.
    * add the ib_inc_rkey helper function to advance the tag part of an rkey.
    
    Consumer interface details:
    
    * new device capability flags IB_DEVICE_MEM_WINDOW_TYPE_2A and
      IB_DEVICE_MEM_WINDOW_TYPE_2B are added to indicate device support
      for these features.
    
      Devices can set either IB_DEVICE_MEM_WINDOW_TYPE_2A or
      IB_DEVICE_MEM_WINDOW_TYPE_2B if it supports type 2A or type 2B
      memory windows. It can set neither to indicate it doesn't support
      type 2 windows at all.
    
    * modify existing provides and consumers code to the new param of
      ib_alloc_mw and the ib_mw_bind_info structure
    Signed-off-by: default avatarHaggai Eran <haggaie@mellanox.com>
    Signed-off-by: default avatarShani Michaeli <shanim@mellanox.com>
    Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
    Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
    7083e42e
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