ib_dma_unmap_bvec(9)

Hey bestie 💖 welcome to ib_dma_unmap_bvec(9), straight from the Kernel API Manual. We're unmapping a bio_vec DMA mapping today, and it's literally gonna be so chill. 🦋

🌸 NAME 🌸

ib_dma_unmap_bvec — Unmap a bio_vec DMA mapping. That's the whole name, no cap. 🎀

✨ SYNOPSIS ✨

Okay so the signature is giving:

void ib_dma_unmap_bvec (struct ib_device *dev , u64 addr , size_t size ,
       enum dma_data_direction direction );

🎀 ARGUMENTS 🎀

• dev — the device for which the DMA address was created. Like, which RDMA device are we talking about? 👑
• addr — the DMA address returned by ib_dma_map_bvec. You know, the one you got from the map call. 💅
• size — the size of the region in bytes. Fr, bytes. 📏
• direction — the direction of the DMA. It's an enum dma_data_direction, and yes, direction matters. 🌈

💅 DESCRIPTION 💅

Okay so this function releases a DMA mapping created by ib_dma_map_bvec. It's the cleanup bestie — the unmapping counterpart to the map call. ✨

For software RDMA devices this is a no-op since no actual mapping occurred. Literally no-op. Not me forgetting to do something; there's just nothing to unmap on those. 💀

🦋 SEE ALSO 🦋

Kernel file ./include/rdma/ib_verbs.h — and the whole squad is here:

• 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), enum ib_mr_type(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_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)

🎀 Source/version: ./include/rdma · Date: October 2026 · Page: ib_dma_unmap_bvec(9) — that's the cute little footer, bestie. Periodt. 💅