free_ud_wq_attr(9)

🌸 free_ud_wq_attr(9) — kernel API manual, bestie edition 🌸

okay so you found a (9) page, that's the kernel API manual section, and this one is literally free_ud_wq_attr 💅 it's a tiny little cleanup function and honestly? iconic for how small it is.

---

✨ NAME ✨

free_ud_wq_attr — clean up that AH attribute cache for UD QPs 🧹✨

🦋 SYNOPSIS 🦋

void free_ud_wq_attr (struct rvt_qp *qp );

no cap, that's the whole signature. void return, one pointer argument, done. 🎀

🍓 ARGUMENTS 🍓

• qp — a valid QP with allowed_ops set. that's the whole vibe check for this argument, it's gotta be valid and have allowed_ops set or we're not doing this 💀

👑 DESCRIPTION 👑

so here's the tea: the rvt_swqe data structure being used is a union, and because of that, this function is only valid for UD QPs. like, only UD. other QP types? not it, don't even try 🙈

lowkey important: this is a union situation, so the "only for UD QPs" thing isn't a suggestion, it's the whole rule. periodt. 🔥

🌈 SEE ALSO 🌈

bestie, the cross-reference list here is long and I respect it deeply. all of these live in the kernel file ./drivers/infiniband/sw/rdmavt/qp.c:

• 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)
• alloc_qpn(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)
• 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)

fr fr, read them all, they're the whole squad 🫶

---

and that's the page!! sign-off time: this one comes from ./drivers/infiniband/sw/rdmavt, dated October 2026, and it's page free_ud_wq_attr(9) of the kernel API manual. slay, go free some UD QP attributes 💖