IBV_UNIMPORT_PD(3)

💅 ibv_import_pd — bestie edition

okay so first things first, the manual name is ibv_impor...import_pd(3) (yes it's truncated like that, it's giving "name too long for the header" energy) and it lives in the Libibverbs Programmer's Manual. two functions in this house: ibv_import_pd and ibv_unimport_pd. one imports a PD, the other un-imports it. iconic symmetry, no notes. ✨

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🌸 NAME 🌸

• ibv_import_pd — import a PD from a given ibv_context
• ibv_unimport_pd — unimport a PD

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🎀 SYNOPSIS 🎀

#include <infiniband/verbs.h>

struct ibv_pd *ibv_import_pd(struct ibv_context *context, uint32_t pd_handle);
void ibv_unimport_pd(struct ibv_pd *pd)

(yes, the second one is missing a semicolon in the original and yes we are keeping it exactly like that 💀 do not come for me, that's literally what it says)

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🦋 DESCRIPTION 🦋

so ibv_import_pd() returns a protection domain (PD) that's associated with the given pd_handle in the given context. that's the whole vibe. 🫶

the input pd_handle value must be a valid kernel handle for a PD object in that given context — like, non-negotiable. and how do you get one? you grab it from the original PD by getting its ibv_pd->handle member value. that's the hookup, iykyk. 🔑

the returned ibv_pd can be used in all verbs that get a protection domain. all of them. every single one. main character PD energy honestly 👑

now ibv_unimport_pd() — it unimports the PD. once the PD usage has ended, ibv_dealloc_pd() or ibv_unimport_pd() should be called. and here's the tea on the difference ☕:

• the first one (ibv_dealloc_pd()) will go to the kernel to destroy the object once the second one does its thing
• the second one (ibv_unimport_pd()) just cleans up whatever is needed — literally the opposite of the import — without calling the kernel

🚨 bestie listen. it is the responsibility of the application to coordinate between all ibv_context(s) that use this PD. once destroy is done, no other process can touch the object except for unimport. all users of the context must collaborate to ensure this. collaborate. as a team. fr fr 🤝

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⭐ RETURN VALUE ⭐

ibv_import_pd() returns a pointer to the allocated PD, or NULL if the request fails. that's it. that's the whole return value. simple, clean, slay 💖

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🌈 SEE ALSO 🌈

ibv_alloc_pd(3), ibv_dealloc_pd(3),

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👑 AUTHOR 👑

Yishai Hadas <yishaih@mellanox.com>

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and that's the page bestie!! brought to you by libibverbs, dated 2020-5-3 — yes it's an oldie but a goodie 🕰️✨ go forth and import responsibly, mwah 💋