ib_modify_qp(9)

💅 ib_modify_qp — bestie's guide to the Kernel API Manual ✨

okay so real talk, this is a page from the Kernel API Manual and it's about ib_modify_qp(9), and honestly? she's iconic. let's get into it 🎀

---

✨ NAME ✨

ib_modify_qp — modifies the attributes for the specified QP and then transitions the QP to the given state.

like, it does exactly what it says on the tin: tweak the QP's attributes, then move that QP into the state you asked for. no cap, that's the whole vibe 🦋

---

🌸 SYNOPSIS 🌸

int ib_modify_qp (struct ib_qp *qp , struct ib_qp_attr *qp_attr , int
qp_attr_mask );

---

💖 ARGUMENTS 💖

• qp — the QP to modify. that's your main character right there 👑
• qp_attr — on input, this specifies the QP attributes to modify. on output, the current values of selected QP attributes are returned. so she's a two-way street, lowkey serving both directions 💅
• qp_attr_mask — a bit-mask used to specify which attributes of the QP are being modified. think of it as the "which of these are we actually touching" checklist 🎀

---

🔥 SEE ALSO 🔥

okay this list is long long, but we don't skip a single one, periodt. every last one of these is going in:

Kernel file ./include/rdma/ib_verbs.h — plus, in no particular order:

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_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)

like I said. long long. but we ate, nobody got left behind 🫶

---

and that's the whole page bestie!! mwah 💋 this one lives in ./include/rdma, it's tagged October 2026, and honestly the whole thing is giving "short but mighty." go modify a QP, you've got this 💜🌈⭐