qla4_83xx_rmw_crb_reg(9)

💅 qla4_83xx_rmw_crb_reg(9) — like, the whole page, bestie

okay so this is from the Kernel API Manual, section 9, and the star of the show is qla4_83xx_rmw_crb_reg(9) — a lil function that does exactly what it says on the tin. Read. Modify. Write. On a CRB register. Iconic behaviour honestly 🎀

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✨ NAME ✨

qla4_83xx_rmw_crb_reg — Read Modify Write crb register 💖

no cap, that's the whole vibe. it reads a thing, it messes with the thing, it writes the thing back.

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🌸 SYNOPSIS 🌸

void qla4_83xx_rmw_crb_reg (struct scsi_qla_host *ha , uint32_t raddr ,
uint32_t waddr , struct qla4_83xx_rmw *p_rmw_hdr );

she returns void btw, so don't go looking for a return value. there isn't one. periodt. 💅

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🦋 ARGUMENTS 🦋

• ha — pointer to the adapter structure 🫶 like, the whole adapter. hand her the adapter and she knows what to do.
• raddr — the CRB address to read from 👀 this is where the value gets scooped up.
• waddr — the CRB address to write to ✨ this is where it lands after the makeover.
• p_rmw_hdr — header with shift/or/xor values. she's got the receipts: the shift values, the OR values, the XOR values, all in there. 💖

ngl, raddr and waddr can absolutely be different addresses — the read spot and the write spot are their own separate things.

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🧚 DESCRIPTION 🧚

okay so here's the tea ☕ — this function reads the value from raddr, ANDs it with test_mask, does a Shift Left, Right/OR/XOR with the values from the RMW header, and then writes the final value to waddr. literally read → glow-up → write. main character energy from start to finish 💅✨

so to recap the pipeline, bestie:

1. read the value from raddr 📖
2. AND it with test_mask 🎀
3. Shift Left, Right/OR/XOR with the values from the RMW header 🔥
4. write the value to waddr ✍️

and that's it. that's the whole function. she ate and left no crumbs 🍓

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/scsi/qla4xxx/ql4_83xx.c 👑 (go read the source, iykyk)
• qla4_83xx_need_reset_handler(9)
• qla4_83xx_poll_reg(9)
• qla4_83xx_read_reset_template(9)
• qla4_83xx_read_write_crb_reg(9)
• qla4_83xx_process_reset_template(9)
• qla4_83xx_isp_reset(9)
• qla4_83xx_eport_init(9)
• qla4_83xx_is_detached(9)

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💀 friendly reminder that this whole page lives in ./drivers/scsi/qla4xxx, and yes the date really says October 2026 — she's booked and busy, we love a scheduling icon 🙈

k byeeee, go forth and modify-write responsibly, mwah 🫶💜🎀