ib_cq_tail(9)

💅 ib_cq_tail — a Kernel API Manual moment (yes bestie, section 9)

okay so bestie, welcome to ib_cq_tail(9), a tiny little function living in the Kernel API Manual and honestly? she's small but she matters. This is the whole vibe: one function, one job, and it does it. Periodt. ✨

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🌸 NAME 🌸

ib_cq_tail — literally just returns the tail index of the cq buffer, that's it, that's the whole thing 💖

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✨ SYNOPSIS ✨

u32 ib_cq_tail (struct ib_cq *send_cq );

ikr, look at her. clean. minimal. main character energy 🎀

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🦋 ARGUMENTS 🦋

• send_cq — the cq for send. that's the one you're handing over, the send-side completion queue, no cap 🫶

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💜 DESCRIPTION 💜

so here's the tea 🔥 — this one gets called inside qp_iter_print to grab the tail of the cq buffer. that's the entire lore. if you're in qp_iter_print and you need the tail index, she's your girl. iykyk 💅

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🌈 SEE ALSO 🌈

bestie there are SO many cousins at this family reunion, buckle in 🧚 — they all live around the Kernel file ./include/rdma/rdmavt_qp.h:

• struct rvt_ud_wr(9)
• struct rvt_krwq(9)
• rvt_get_swqe_ah_attr(9)
• rvt_get_swqe_remote_qpn(9)
• rvt_get_swqe_remote_qkey(9)
• rvt_get_swqe_pkey_index(9)
• rvt_get_rq_count(9)
• struct rvt_operation_params(9)
• rvt_is_user_qp(9)
• rvt_get_qp(9)
• rvt_put_qp(9)
• rvt_put_swqe(9)
• rvt_qp_wqe_reserve(9)
• rvt_qp_wqe_unreserve(9)
• rvt_div_round_up_mtu(9)
• rvt_div_mtu(9)
• rvt_timeout_to_jiffies(9)
• rvt_lookup_qpn(9)
• rvt_mod_retry_timer_ext(9)
• rvt_put_qp_swqe(9)
• rvt_qp_swqe_incr(9)
• rvt_recv_cq(9)
• rvt_send_cq(9)
• rvt_qp_complete_swqe(9)
• struct rvt_qp_iter(9)
• ib_cq_head(9) — her sibling!! head and tail, iconic duo 👑
• rvt_free_rq(9)
• rvt_to_iport(9)
• rvt_rc_credit_avail(9)

like i said. big family. all of them matter, don't skip a single one 🙈

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and that's the page, bestie!! 🍓 source livin' in ./include/rdma, dated October 2026 — mwah, go read some kernel headers, love u, bye 💋