IONICDV(7)

💖 ionicdv — direct verbs for ionic devices 💖

okay so you’re reading IONICDV(7), straight out of the Ionic Programmer’s Manual, and it’s giving low-level Unix excellence, no cap. 🫶

💖 NAME 💖

ionicdv — Direct verbs for ionic devices, bestie. It provides low level access to ionic devices so you can perform direct operations, without the general branching performed by libibverbs. Periodt. 💅

✨ DESCRIPTION ✨

Okay so picture this: the libibverbs API is an abstract one. It is agnostic to any underlying provider specific implementation. The way that this abstraction gives you user applications portability is iconic, but it has a performance penalty. For some applications, optimizing performance is more important than portability. That’s the whole vibe here. 🔥

The ionic direct verbs API is intended for such applications. It exposes ionic specific low level operations, allowing the application to bypass the libibverbs API. The direct include of ionic_dv.h together with linkage to the ionic library will allow usage of this new interface. Slay. ✨

🌀 UDMA Pipelines 🌀

Ionic devices expose multiple UDMA pipelines. Queues can be assigned to specific pipelines by setting a UDMA mask on the protection domain before creating queues. Use ionic_dv_ctx_get_udma_count(3) and ionic_dv_ctx_get_udma_mask(3) to query the available pipelines, and ionic_dv_pd_set_udma_mask(3) to restrict queue placement. iykyk 🦋

🎀 Controller Memory Bar (CMB) 🎀

Send and receive queues can optionally be placed in the controller memory bar for lower latency doorbell operations. Express doorbell optimizations may also be enabled. Use ionic_dv_pd_set_sqcmb(3) and ionic_dv_pd_set_rqcmb(3) to configure CMB preferences on a protection domain before creating queues. Main character CMB energy, honestly. 👑

👀 SEE ALSO 👀

• ionic_dv_ctx_get_udma_count(3)
• ionic_dv_ctx_get_udma_mask(3)
• ionic_dv_pd_get_udma_mask(3)
• ionic_dv_pd_set_udma_mask(3)
• ionic_dv_pd_set_sqcmb(3)
• ionic_dv_pd_set_rqcmb(3)
• verbs(7)

💅 AUTHORS 💅

Advanced Micro Devices, Inc. — that’s the author credit, bestie. 🫶

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xoxo, your Unix bestie 💖 — source/version ionic, dated 2025-06-23.