__rpcrdma_regbuf_dma_map(9)

💅 __rpcrdma_regbuf_dma_map — like, the whole vibe check 💅

okay bestie, so this is a page straight outta the Kernel API Manual, and the star of the show is __rpcrdma_regbuf_dma_map(9). yes the double underscore is part of the name, she's ✨iconic✨ like that. sit down, grab a strawberry 🍓, we're gonna DMA-map a regbuf together and it's gonna be so chill.

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🌸 NAME 🌸

__rpcrdma_regbuf_dma_map — DMA-map a regbuf 💖

like, that's it. that's the whole job. one (1) regbuf, DMA-mapped. no cap.

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✨ SYNOPSIS ✨

bool __rpcrdma_regbuf_dma_map (struct rpcrdma_xprt *r_xprt , struct
rpcrdma_regbuf *rb );

it returns a bool, she takes two pointers, and the line break in the middle is NOT a typo, that's just how the original rolls 💀 copy it exactly, okay?

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🎀 ARGUMENTS 🎀

• r_xprt — the controlling transport instance 🚂 like, the boss of the whole transport situation, the main character energy of this call tbh
• rb — the regbuf to be mapped 🧚 this is the little buffer getting its glow-up into DMA-land

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🦋 DESCRIPTION 🦋

Returns true if the buffer is now DMA mapped to r_xprt's device 🌈

that's the whole plot. no twist ending. if the map went through, you get true, and the buffer is officially living its best life on r_xprt's device. obsessed tbh 🫶

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⭐ SEE ALSO ⭐

okay this is the part where I introduce you to the whole friend group 😭 they're all in the kernel file ./net/sunrpc/xprtrdma/verbs.c and they all show up to the group chat together, no one gets left on read:

• rpcrdma_flush_disconnect(9)
• rpcrdma_wc_send(9)
• rpcrdma_wc_receive(9)
• rpcrdma_cm_event_handler(9)
• rpcrdma_xprt_connect(9)
• rpcrdma_xprt_disconnect(9)
• rpcrdma_sendctx_get_locked(9)
• rpcrdma_sendctx_unget_locked(9)
• rpcrdma_sendctx_put_locked(9)
• rpcrdma_mrs_refresh(9)
• rpcrdma_req_create(9)
• rpcrdma_req_setup(9)
• rpcrdma_rep_put(9)
• rpcrdma_buffer_create(9)
• rpcrdma_req_destroy(9)
• rpcrdma_mrs_destroy(9)
• rpcrdma_buffer_destroy(9)
• rpcrdma_mr_get(9)
• rpcrdma_reply_put(9)
• rpcrdma_buffer_get(9)
• rpcrdma_buffer_put(9)
• rpcrdma_regbuf_realloc(9)
• rpcrdma_post_recvs(9)

go read them, they're literally all so good 🔥 iykyk.

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💀 friendly reminder: this page ships out of ./net/sunrpc/xprtrdma and it's dated October 2026. screenshot it, pin it, whatever — that's the source/version and the date, bestie, and that's the tea ☕

k byeee, go map some buffers, ily 🎀💜🌸