mlx5r_umr_revoke_mr(9)

💅 mlx5r_umr_revoke_mr(9) — like, the Kernel API Manual bestie ✨

okay so this is mlx5r_umr_revoke_mr(9) from the Kernel API Manual and honestly? it's giving "one job, does it well" energy 🎀 no cap, let's get into it.

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🌸 NAME 🌸

mlx5r_umr_revoke_mr — fence all DMA on the MR 🚧✨ that's the whole vibe, that's the whole function.

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🦋 SYNOPSIS 🦋

int mlx5r_umr_revoke_mr (struct mlx5_ib_mr *mr );

literally just hand it an MR and it returns an int, periodt 💅

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🎀 ARGUMENTS 🎀

• mr — the MR to fence. the main character of this whole operation tbh 👑 that's the memory region getting fenced off, no questions asked.

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✨ DESCRIPTION ✨

okay so here's the tea ☕ — once this function returns, the NIC is not gonna be doing any DMA to the pages under the MR. none. zero. not a single byte 🚫💀 and any DMA that was already in progress? it gets completed. like, finished properly, not just abandoned mid-vibe. 🫶

and bestie, listen — if this function fails, that's not a "oops try again" situation 😭 that means the HW has failed catastrophically. like, catastrophic-catastrophic. the hardware is not okay. that's the failure signal, iykyk 💀🔥

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/infiniband/hw/mlx5/umr.c — the source, go read it if you're nosy (you should be) 🧚
• mlx5r_umr_dmabuf_update_pgsz(9) — her sister function, go say hi 🍓

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and that's the page!! mwah 💖 this gem lives under ./drivers/infiniband/hw/mlx5, dated October 2026, brought to you by the mlx5r_umr_revoke_mr(9) era of the Kernel API Manual — slay responsibly, bestie 🫶✨🌸