qla_rsp_ring_rewind_to(9)

💅 qla_rsp_ring_rewind_to(9) — like, the Kernel API Manual, bestie 💅

okay so picture this: you're deep in the qla2xxx driver, the response queue is doing its thing, and suddenly you gotta hit undo on the consumer pointer. that's this function. it's giving time-travel but make it kernel ✨

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🎀 SYNOPSIS 🎀

void qla_rsp_ring_rewind_to (struct rsp_que *rsp , response_t *pkt ,
       uint16_t idx );

literally just three little guys. no return value, no drama. void queens only 💜

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🌸 ARGUMENTS 🌸

• rsp — the response queue. that's her. the main character of this whole operation 👑
• pkt — a 64-byte view of the slot you wanna rewind to. like a little snapshot. it was captured from a prior read of rsp->ring_ptr, so don't just go making one up, mkay? 🙈
• idx — the matching ring_index value. also captured before the advance. these two are a matching set, don't separate them fr fr 🫶

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💖 DESCRIPTION 💖

so here's the tea ☕ — this whole thing exists so we can restore the response queue consumer pointer to a previously-observed slot. why? because sometimes we need to defer processing an IOCB whose continuation entries haven't arrived yet. like, the vibes aren't complete, the entries aren't here, so we rewind and wait. iconic behavior honestly.

on 29xx, pkt was originally obtained as (response_t *)rsp->ring_ext_ptr, so casting back to struct response_ext * recovers the 128-byte-stride slot pointer. that's the whole trick. the way that 128-byte stride just *works*— obsessed 😭🔥

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🔥 SEE ALSO 🔥

go read these next, iykyk:

• Kernel file ./drivers/scsi/qla2xxx/qla_inline.h
• qla24xx_calc_iocbs(9)
• qla29xx_calc_iocbs(9)
• qla_req_entry_size(9)
• qla_rsp_entry_size(9)
• qla_sts_cont_data_size(9)
• qla_logio_set_vp_index(9)
• qla_rsp_ring_advance(9)
• qla_req_ring_slot(9)
• qla_req_ring_advance(9)

they're all in the group chat. read them. slay 💅✨

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and that's a wrap, bestie 🦋 this lil page lives in ./drivers/scsi/qla2xxx, dated October 2026 — no cap, go rewind that ring responsibly 🌈⭐