ib_dma_unmap_sg(9)

💅 ib_dma_unmap_sg(9) — Kernel API Manual ✨

okay so bestie, we are in the Kernel API Manual and this one is ib_dma_unmap_sg(9). It’s giving “cleanup era” for your DMA scatter/gather moment, and honestly? iconic. 🫶

🌸 NAME 🌸

ib_dma_unmap_sg — unmap a scatter/gather list of DMA addresses. That’s the assignment, and she ate. 💖

✨ SYNOPSIS ✨

the signature, exactly as it lives, no cap:

void ib_dma_unmap_sg (struct ib_device *dev , struct scatterlist *sg ,
       int nents , enum dma_data_direction direction );

🎀 ARGUMENTS 🎀

• dev — the device for which the DMA addresses were created. Like, whose DMA addresses are these? This device’s. 🦋
• sg — the array of scatter/gather entries. The list itself. main character energy, fr fr.
• nents — the number of scatter/gather entries. Count them, bestie. 🔢
• direction — the direction of the DMA. periodt. 💅

🦋 SEE ALSO 🦋

the whole extended friend group is here, and we are not skipping a single one — verbatim cross-refs because precision is the vibe:

Kernel file ./include/rdma/ib_verbs.h 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_unmap_bvec(9), ib_dma_map_sgtable_attrs(9),
ib_dma_map_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)

made with love from source/version ./include/rdma, dated October 2026 — mwah 💋🎀