ENUM IB_MR_TYPE(9)

🌸 enum ib_mr_type(9) 🌸

okay so bestie, welcome to the Kernel API Manual ✨ this little page is literally all about enum ib_mr_type — the memory region type tea ☕ and it's giving "small but iconic". let's get into it 💅

✨ NAME ✨

enum ib_mr_type — memory region type 🎀

✨ SYNOPSIS ✨

enum ib_mr_type {
    IB_MR_TYPE_MEM_REG ,
    IB_MR_TYPE_SG_GAPS ,
    IB_MR_TYPE_DM ,
    IB_MR_TYPE_USER ,
    IB_MR_TYPE_DMA ,
    IB_MR_TYPE_INTEGRITY

};

💖 Constants 💖

• IB_MR_TYPE_MEM_REG — memory region that is used for normal registration 🌸 the standard-issue one, no drama.
• IB_MR_TYPE_SG_GAPS — memory region that is capable to register any arbitrary sg lists (without the normal mr constraints - see ib_map_mr_sg) 🦋 she does not play by the normal mr constraints, and yes, go look at ib_map_mr_sg for the deets.
• IB_MR_TYPE_DM — memory region that is used for device memory registration 💜 device memory vibes only.
• IB_MR_TYPE_USER — memory region that is used for the user-space application 🙈 the user-space application's own little memory region.
• IB_MR_TYPE_DMA — memory region that is used for DMA operations without address translations (VA=PA) 🔥 no address translations, VA=PA, periodt.
• IB_MR_TYPE_INTEGRITY — memory region that is used for data integrity operations ⭐ keeping the data honest, we love that.

👑 SEE ALSO 👑

Kernel file ./include/rdma/ib_verbs.h — plus honestly the whole friend group: struct rdma_stat_desc(9), struct rdma_hw_stats(9), ib_rate_to_mult(9), ib_rate_to_mbps(9), ib_port_attr_to_speed_info(9), struct ib_mr_status(9), mult_to_ib_rate(9), struct ib_udata(9), struct rdma_netdev(9), struct ib_device_ops(9), ib_get_client_data(9), ib_modify_qp_is_ok(9), rdma_cap_ib_switch(9), rdma_start_port(9), rdma_for_each_port(9), rdma_end_port(9), rdma_cap_ib_mad(9), rdma_cap_opa_mad(9), rdma_cap_ib_smi(9), rdma_cap_ib_cm(9), rdma_cap_iw_cm(9), rdma_cap_ib_sa(9), rdma_cap_ib_mcast(9), rdma_cap_af_ib(9), rdma_cap_eth_ah(9), rdma_cap_opa_ah(9), rdma_max_mad_size(9), rdma_cap_roce_gid_table(9), rdma_core_cap_opa_port(9), rdma_mtu_enum_to_int(9), rdma_mtu_from_attr(9), ib_alloc_pd(9), ib_dealloc_pd(9), rdma_create_ah(9), rdma_create_user_ah(9), ib_get_gids_from_rdma_hdr(9), ib_get_rdma_header_version(9), ib_init_ah_attr_from_wc(9), ib_create_ah_from_wc(9), rdma_modify_ah(9), rdma_query_ah(9), rdma_destroy_ah_user(9), rdma_destroy_ah(9), ib_modify_srq(9), ib_query_srq(9), ib_destroy_srq_user(9), ib_destroy_srq(9), ib_post_srq_recv(9), ib_create_qp(9), ib_modify_qp_with_udata(9), ib_modify_qp(9), ib_query_qp(9), ib_destroy_qp(9), ib_open_qp(9), ib_close_qp(9), ib_post_send(9), ib_post_recv(9), ib_alloc_cq_any(9), rdma_set_cq_moderation(9), ib_destroy_cq_user(9), ib_destroy_cq(9), ib_poll_cq(9), ib_req_notify_cq(9), ib_virt_dma_to_ptr(9), ib_virt_dma_to_page(9), ib_dma_mapping_error(9), ib_dma_map_single(9), ib_dma_unmap_single(9), ib_dma_map_page(9), ib_dma_unmap_page(9), ib_dma_map_bvec(9), ib_dma_unmap_bvec(9), ib_dma_map_sgtable_attrs(9), ib_dma_map_sg(9), ib_dma_unmap_sg(9), ib_dma_max_seg_size(9), ib_dma_sync_single_for_cpu(9), ib_dma_sync_single_for_device(9), ib_dereg_mr_user(9), ib_dereg_mr(9), ib_update_fast_reg_key(9), ib_inc_rkey(9), ib_attach_mcast(9), ib_detach_mcast(9), ib_check_mr_status(9), ib_device_try_get(9), rdma_ah_find_type(9), ib_lid_cpu16(9), ib_lid_be16(9), rdma_roce_rescan_device(9), rdma_device_to_ibdev(9), ibdev_to_node(9), rdma_device_to_drv_device(9), rdma_flow_label_to_udp_sport(9), rdma_calc_flow_label(9), rdma_get_udp_sport(9) 💀 that's a lot of friends but we stan a well-connected enum.

🫶 that's the whole page bestie, go forth and register your memory regions correctly 💖

and that's a wrap, mwah 💋 — this one came from ./include/rdma and it's dated October 2026, so jot that down 🎀✨