rdma_cap_ib_switch(9)

🦋 rdma_cap_ib_switch(9) — Kernel API Manual 🦋

✨ NAME ✨

rdma_cap_ib_switch — check if the device is IB switch 💅

🌸 SYNOPSIS 🌸

bool rdma_cap_ib_switch (const struct ib_device *device );

🎀 ARGUMENTS 🎀

• device — the device to check, bestie. That's it, that's the whole input 🫶

💖 DESCRIPTION 💖

okay so real talk: the device driver is the one responsible for setting the is_switch bit on in the ib_device structure at init time ✨. That's the whole setup — the driver does it at init time, no cap.

This function is literally just the vibe check for that bit, so you can ask “is this thing an IB switch?” without doing detective work 🕵️‍♀️.

⭐ RETURN ⭐

true if the device is IB switch 👑. That's the answer, periodt.

🌈 SEE ALSO 🌈

Kernel file ./include/rdma/ib_verbs.h is the main character here, and the whole extended fam is:

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_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)

okay that's the whole page, bestie 💖 huge kisses from rdma_cap_ib_switch(9) in the Kernel API Manual, October 2026 edition, source vibes from ./include/rdma — bye! 🎀