pci_epc_set_msix(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_epc_set_msix(9) — a Kernel API Manual moment ✨

okay so bestie, welcome to the pci_epc_set_msix(9) page 🎀 this is straight out of the Kernel API Manual and it's lowkey iconic, ngl.

🌸 NAME 🌸

pci_epc_set_msix — set the number of MSI-X interrupt numbers required 💖

🦋 SYNOPSIS 🦋

int pci_epc_set_msix (struct pci_epc *epc , u8 func_no , u8 vfunc_no ,
u16 nr_irqs , enum pci_barno bir , u32 offset );

like, that's the whole signature, no cap. copy it exactly bestie, don't get creative with it 😭

✨ ARGUMENTS ✨

  • epc — the EPC device on which MSI-X has to be configured 🫶 this is the main character here
  • func_no — the physical endpoint function number in the EPC device 💫
  • vfunc_no — the virtual endpoint function number in the physical function 🌈 (yes, virtual inside physical, it's giving nested lore)
  • nr_irqs — number of MSI-X interrupts required by the EPF 🔥
  • bir — BAR where the MSI-X table resides 👑
  • offset — Offset pointing to the start of MSI-X table ⭐

💜 DESCRIPTION 💜

Invoke this one to set the required number of MSI-X interrupts 💅 that's it, that's the whole vibe. you call it, you set the number, you slay.

🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/endpoint/pci-epc-core.c — that's where the magic lives, go read it iykyk 📖

and the whole friend group of related calls, all present and accounted for (not me listing every single one… but also yes, all of them):

bestie reminder 🫶 every flag, every argument, every path above is exactly as written — I would never do you dirty and paraphrase the technical bits 💖

and that's the page!! 🎀 brought to you by the fine folks over in ./drivers/pci/endpoint, stamped October 2026, Kernel API Manual energy only ✨ go forth and configure your MSI-X, queen 👑💅

📦 where this page comes from