IBD_DEF_RC_MAX_SDU
#define IBD_DEF_RC_MAX_MTU (IBD_DEF_RC_MAX_SDU + IPOIB_HDRSIZE)
macp->m_max_sdu = IBD_DEF_RC_MAX_SDU;
max = IBD_DEF_RC_MAX_SDU;
min = max = IBD_DEF_RC_MAX_SDU;
macp->m_max_sdu = IBD_DEF_RC_MAX_SDU;