__ib_alloc_pd(9)

💅 __ib_alloc_pd — like, the whole Kernel API Manual entry, bestie ✨

okay so picture this: it's giving "Kernel API Manual", section 9, and the star of the show is __ib_alloc_pd. yes the double underscore is on purpose, she's an internal queen 👑

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🌸 NAME 🌸

__ib_alloc_pd — literally just allocates an unused protection domain. that's it, that's the whole vibe 🦋

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✨ SYNOPSIS ✨

struct ib_pd * __ib_alloc_pd (struct ib_device *device , unsigned int
flags , const char *caller );

copy it exactly, don't @ me 🙈

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🎀 ARGUMENTS 🎀

• device — the device you're allocating the protection domain on. like, the actual hardware friend in question 💖
• flags — protection domain flags. yes, flags. plural. bring them 🫶
• caller — the caller's build-time module name. yep, you gotta say who you are, iykyk 🌈

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⭐ DESCRIPTION ⭐

so a protection domain object? she's the social glue fr fr. she provides an association between QPs, shared receive queues, address handles, memory regions, and memory windows. the way she connects everything — main character energy honestly 👑

and every PD has a local_dma_lkey which can be used as the lkey value for local memory operations. no cap, it's right there for you 💅

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🦋 SEE ALSO 🦋

kernel file ./drivers/infiniband/core/verbs.c, plus the whole friend group:

• ib_dealloc_pd_user(9)
• rdma_copy_ah_attr(9)
• rdma_replace_ah_attr(9)
• rdma_move_ah_attr(9)
• rdma_create_ah(9)
• rdma_create_user_ah(9)
• rdma_move_grh_sgid_attr(9)
• rdma_destroy_ah_attr(9)
• ib_create_srq_user(9)
• ib_create_qp_user(9)
• ib_resolve_eth_dmac(9)
• ib_modify_qp_with_udata(9)
• ib_alloc_mr(9)
• ib_alloc_mr_integrity(9)
• ib_alloc_xrcd_user(9)
• ib_dealloc_xrcd_user(9)
• ib_create_wq(9)
• ib_destroy_wq_user(9)
• ib_map_mr_sg_pi(9)
• ib_map_mr_sg(9)
• ib_sg_to_pages(9)
• ib_drain_sq(9)
• ib_drain_rq(9)
• ib_drain_qp(9)
• rdma_alloc_hw_stats_struct(9)
• rdma_free_hw_stats_struct(9)

like... the whole roster. go read them, bestie, they're all iconic 🔥

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💜 mwah, that's a wrap! this little love letter lives in ./drivers/infiniband/core and it's stamped October 2026 — so go forth, allocate responsibly, and slay 🧚‍♀️✨