epf_ntb_con...ad_bar_alloc(9)

📦 version 7.3.1, in nixpkgs unstable

💅 epf_ntb_config_spad_bar_alloc — Kernel API Manual, bestie edition ✨

okay so this is a page from the Kernel API Manual, and it's about epf_ntb_config_spad_bar_alloc — yes the whole name, the header just clipped it to epf_ntb_con...ad_bar_alloc because even manpage headers get tired 😭

🌸 NAME 🌸

epf_ntb_config_spad_bar_alloc — allocate memory for the config + scratchpad region, bestie 💖

🦋 SYNOPSIS 🦋

int epf_ntb_config_spad_bar_alloc (struct epf_ntb *ntb );

that's it. that's the whole call. iconic 💅

🎀 ARGUMENTS 🎀

  • ntb — the NTB device that facilitates communication between HOST and VHOST 🫶 (she's the main character here, the whole host↔vhost situationship runs through her)

✨ DESCRIPTION ✨

So what she does is allocate the Local Memory mentioned in the above diagram 👀 (yes, that diagram — iykyk).

The size of the CONFIG REGION is sizeof(struct epf_ntb_ctrl), periodt. No cap, that's the exact size, don't come for me.

And the size of the SCRATCHPAD REGION? That one's not hardcoded — it's obtained from the "spad-count" configfs entry. So whatever you put in there is what you get, lowkey 🔥

🌈 RETURN 🌈

Zero for success 🎉 — or an error code in case of failure 💀 (she will let you know, she's honest like that)

🧚 SEE ALSO 🧚

the kernel file itself, right here:

  • ./drivers/pci/endpoint/functions/pci-epf-vntb.c

and the whole friend group 💖:

like, the entire epf_ntb_* friend group showed up to the group chat, and honestly? obsessed 🫶

and that's the page bestie!! 🌟 she lives in ./drivers/pci/endpoint/functions, she's dated October 2026, and she's filed under epf_ntb_con...ad_bar_alloc(9) — go read the source, mwah 💋💖✨

📦 where this page comes from