MCX_HCA_CAP_NMAILBOXES
if (mcx_cmdq_mboxes_alloc(sc, &mxm, MCX_HCA_CAP_NMAILBOXES,
mcx_cmdq_mboxes_sign(&mxm, MCX_HCA_CAP_NMAILBOXES);
if (mcx_cmdq_mboxes_alloc(sc, &mxm, MCX_HCA_CAP_NMAILBOXES,
mcx_cmdq_mboxes_sign(&mxm, MCX_HCA_CAP_NMAILBOXES);