THE IP ACCELERATOR(9)

💅 The IP Accelerator ✨

okay bestie, welcome to the The IP Accelerator(9) glow-up — this one lives in the Kernel API Manual and it's all about the Qualcomm IPA, no cap 🫶

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🌸 the actual tea ☕

This driver supports the Qualcomm IP Accelerator (IPA) — and if you're like "what even is that," it's a networking component that shows up in many Qualcomm SoCs. Iconic of it.

So the IPA is connected to the application processor (AP)... but that's not all, babes. It's also connected to — and partially controlled by — other "execution environments" (EEs), like a modem. main character energy, honestly 💅

The IPA is literally the conduit between the AP and the modem that carries network traffic. This driver presents a network interface that represents the modem's connection to external (e.g. LTE) networks. slay 🌈

The IPA also provides protocol checksum calculation, offloading all that work off the AP — yes, she's helpful like that 💖 The IPA offers more functionality too, including routing, filtering, and NAT support, but that more advanced stuff is not currently supported. 😭 Despite that, some resources — including routing tables and filter tables — are defined in this driver, because they must be initialized even when you're not using the advanced hardware features. like, they gotta exist regardless, iykyk.

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🦋 the two layers (this is the important part, fr fr) 🎀

There are two distinct layers that implement the IPA hardware, and the way the driver is organized reflects that. periodt.

• The generic software interface (GSI) is an integral component of the IPA — it gives you a well-defined communication layer between the AP subsystem and the IPA core. The GSI implements a set of "channels" used for communication between the AP and the IPA. 💫
• The IPA layer uses those GSI channels to implement its "endpoints."

And here's the vibe check: while a GSI channel carries data between the AP and the IPA, a pair of IPA endpoints is what carries traffic between two EEs. specifically 👇

The main modem network interface is implemented by two pairs of endpoints: a TX endpoint on the AP coupled with an RX endpoint on the modem; and another RX endpoint on the AP receiving data from a TX endpoint on the modem. 🧚

like... two pairs, both directions, that's the whole thing. ate 💀✨

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🫶 SEE ALSO 🌈

go read these next, bestie, they're all right here:

• Kernel file ./drivers/net/ipa/ipa_main.c enum ipa_firmware_loader(9)
• ipa_setup(9)
• ipa_teardown(9)
• ipa_hardware_dcd_config(9)
• ipa_hardware_config(9)
• ipa_hardware_deconfig(9)
• ipa_config(9)
• ipa_deconfig(9)
• ipa_probe(9)

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okay that's the whole page, mwah 💋 this little love letter comes from ./drivers/net/ipa, dated October 2026, and it goes by The IP Accelerator(9) — catch you in the next manpage, bestie 🎀💜🦋