• Hariprasad Shenai's avatar
    cxgb4/iw_cxgb4: use firmware ord/ird resource limits · 4c2c5763
    Hariprasad Shenai authored
    Advertise a larger max read queue depth for qps, and gather the resource limits
    from fw and use them to avoid exhaustinq all the resources.
    
    Design:
    
    cxgb4:
    
    Obtain the max_ordird_qp and max_ird_adapter device params from FW
    at init time and pass them up to the ULDs when they attach.  If these
    parameters are not available, due to older firmware, then hard-code
    the values based on the known values for older firmware.
    iw_cxgb4:
    
    Fix the c4iw_query_device() to report these correct values based on
    adapter parameters.  ibv_query_device() will always return:
    
    max_qp_rd_atom = max_qp_init_rd_atom = min(module_max, max_ordird_qp)
    max_res_rd_atom = max_ird_adapter
    
    Bump up the per qp max module option to 32, allowing it to be increased
    by the user up to the device max of max_ordird_qp.  32 seems to be
    sufficient to maximize throughput for streaming read benchmarks.
    
    Fail connection setup if the negotiated IRD exhausts the available
    adapter ird resources.  So the driver will track the amount of ird
    resource in use and not send an RI_WR/INIT to FW that would reduce the
    available ird resources below zero.
    Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
    Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    4c2c5763
cxgb4.h 37 KB