frwr_mr_init(9)

💅 frwr_mr_init — like, the Kernel API Manual page for frwr_mr_init(9) 🎀

okay bestie, gather round, because today we're getting into the networking part of the kernel and honestly? it's giving main character energy ✨

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✨ NAME ✨

frwr_mr_init — initialize one MR 🫶

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🌸 SYNOPSIS 🌸

int frwr_mr_init (struct rpcrdma_xprt *r_xprt , struct rpcrdma_mr *mr );

no cap, that's the whole signature. copy it exactly, i'm literally begging 🙈

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🦋 ARGUMENTS 🦋

• r_xprt — the controlling transport instance, aka the boss of this whole situation 👑
• mr — the generic MR that we're prepping for FRWR, like getting it dressed for the function 💅

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💖 DESCRIPTION 💖

so here's the tea: this function initializes one MR. that's it, that's the vibe.

it returns zero if everything slayed ✅ — otherwise you get a negative errno back, which is the kernel's way of saying "girl, no" 😭

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🔥 SEE ALSO 🔥

if you're obsessed (and you should be), go read the kernel file ./net/sunrpc/xprtrdma/frwr_ops.c — it's the source of truth fr fr. and while you're there, the whole friend group:

• frwr_mr_release(9)
• frwr_reset(9)
• frwr_query_device(9)
• frwr_map(9)
• frwr_wc_fastreg(9)
• frwr_send(9)
• frwr_reminv(9)
• frwr_wc_localinv(9)
• frwr_wc_localinv_wake(9)
• frwr_unmap_sync(9)
• frwr_wc_localinv_done(9)
• frwr_unmap_async(9)
• frwr_wp_create(9)

like, the whole squad. read them all, iyk yk 🧚

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💜 and that's the page!! 💜

this iconic little number lives in ./net/sunrpc/xprtrdma and it's dated October 2026 ⭐ — mwah, go touch some errnos bestie, ily 💖🌷🦋