alloc_qpn(9)

🎀 NAME 🎀

okay bestie, this is alloc_qpn(9) from the Kernel API Manual — yes, we're in the kernel API manual, and this little function is here to allocate the next available qpn, or zero/one for QP type IB_QPT_SMI/IB_QPT_GSI. that's the whole main-character job ✨

✨ SYNOPSIS ✨

int alloc_qpn (struct rvt_dev_info *rdi , struct rvt_qpn_table *qpt ,
       enum ib_qp_type type , u8 port_num , u8 exclude_prefix );

🫶 ARGUMENTS 🫶

• rdi — the rvt device info structure. 💖
• qpt — pointer to the queue pair number table. 🎀
• type — the QP type. 🦋
• port_num — IB port number, 1 based, comes from core. 🌸
• exclude_prefix — prefix of special queue pair number being allocated. 💅

💫 RETURN 💫

The queue pair number. that's the return value, bestie — that's the whole vibe. 👑

🔗 SEE ALSO 🔗

The kernel file is ./drivers/infiniband/sw/rdmavt/qp.c — yes, that exact path, no cap. 🫶

Here's the full see-also squad:

• init_qpn_table(9), free_qpn_table(9), rvt_driver_qp_init(9), rvt_free_qp_cb(9), rvt_free_all_qps(9)
• rvt_qp_exit(9), rvt_clear_mr_refs(9), rvt_swqe_has_lkey(9), rvt_qp_sends_has_lkey(9), rvt_qp_acks_has_lkey(9)
• rvt_qp_mr_clean(9), rvt_remove_qp(9), rvt_alloc_rq(9), rvt_init_qp(9), _rvt_reset_qp(9)
• rvt_reset_qp(9), rvt_free_qpn(9), get_allowed_ops(9), free_ud_wq_attr(9), alloc_ud_wq_attr(9)
• rvt_create_qp(9), rvt_error_qp(9), rvt_modify_qp(9), rvt_destroy_qp(9), rvt_query_qp(9)
• rvt_post_recv(9), rvt_qp_valid_operation(9), rvt_qp_is_avail(9), rvt_post_one_wr(9), rvt_post_send(9)
• rvt_post_srq_recv(9), get_rvt_head(9), rvt_get_rwqe(9), rvt_comm_est(9), rvt_add_rnr_timer(9)
• rvt_stop_rc_timers(9), rvt_stop_rnr_timer(9), rvt_del_timers_sync(9), rvt_qp_iter_init(9), rvt_qp_iter_next(9)
• rvt_qp_iter(9), rvt_copy_sge(9), rvt_ruc_loopback(9)

shoutout to the ./drivers/infiniband/sw/rdmavt source and the October 2026 date on this alloc_qpn(9) page — mwah, bestie 💖