• Dennis Dalessandro's avatar
    IB/hfi1: Prepare resource waits for dual leg · 5da0fc9d
    Dennis Dalessandro authored
    Current implementation allows each qp to have only one send engine.  As
    such, each qp has only one list to queue prebuilt packets when send engine
    resources are not available. To improve performance, it is desired to
    support multiple send engines for each qp.
    
    This patch creates the framework to support two send engines
    (two legs) for each qp for the TID RDMA protocol, which can be easily
    extended to support more send engines. It achieves the goal by creating a
    leg specific struct, iowait_work in the iowait struct, to hold the
    work_struct and the tx_list as well as a pointer to the parent iowait
    struct.
    
    The hfi1_pkt_state now has an additional field to record the current legs
    work structure and that is now passed to all egress waiters to determine
    the leg that needs to wait via a new iowait helper.  The APIs are adjusted
    to use the new leg specific struct as required.
    
    Many new and modified helpers are added to support this change.
    Reviewed-by: default avatarMitko Haralanov <mitko.haralanov@intel.com>
    Signed-off-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
    Signed-off-by: default avatarKaike Wan <kaike.wan@intel.com>
    Signed-off-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
    Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
    5da0fc9d
user_sdma.c 42.4 KB