IB_RATE_50_GBPS
case IB_RATE_50_GBPS: return 20;
case 20: return IB_RATE_50_GBPS;
case IB_RATE_50_GBPS: return 53125;
IB_RATE_200_GBPS, IB_RATE_50_GBPS,
case IB_RATE_50_GBPS: