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Property:cpunet.ko
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Kernel-Module
Note that Kernel 2.4 and builtin *.o modules have been renamed to *.ko for an easier comparison.
| Command: | cpunet.ko - type Mod | Wiki | Freetz | IPPF | whmf | AVM | Web |
| Location: | Shell-Commands >> Kernel-Modules - Origin: AVM | ||||||
| Path: | Release: ./extra Lab+Rel: ./extra, /usr/lib/debug/lib/modules/4.9.325/extra | ||||||
| Properties: | Size: 15.2k - 420k - Firmware: 7.19 - 8.00 | ||||||
| Function: | Cross CPU Network Device (GPL) | ||||||
Goto: GPL-Browser - Dependencies - Model-Matrix - Symbols - SMW-Browser
Details
cpunet.ko is the AVM driver for the cpunet or cpunet0 network interface used for Inter-CPU communication on models
with a Falcon or Seale SoC, see the Model-Matrix below.
On the Falcon cpunet interconnects the Bootcore Linux (prxB, secure) and the Interaptiv Linux (prxI, unsecure).
On the Seale cpunet interconnects the Bootcore Linux (grxB5, secure) and the Interaptiv Linux (grx5, unsecure).
cpunet.ko is loaded by rc.cpunet which is started by cpunet.service.
Full quote of the fw 7.50 README:
This driver spawns a netdevice named "cpunet" that allows communicating between two systems using the well known socket API. The requirement for this is that these two systems share some memory. See the "avm,cpunet.txt" device tree binding file for more information on how to integrate the driver. IPv6 only: This device only supports IPv6. IPv4 or even non-IP protocols will not work. This is for two reasons: 1. IPv6 has support for unique local addresses. This avoids clashes with user selected subnets on the lan bridge. 2. As a consequence of 1, and because we do not need layer2 addresses, no layer2 headers are generated. Usage: Add IPv6 addresses on both sides (peferably ULA) and just use it as any other network device. Latency: Icmp round trip time is comparable to loopback on grx (< 200 µs difference). TCP Performance: The performance with iperf3 tcp is 110MBit/s. The bottleneck here is the bootcore which is at 100% CPU while the interaptiv is mostly idle. Sendfile from bootcore to interaptiv performs at 170Mbit/s. Despite being at its limit the bootcore stays responsive because of the implemented interrupt mitigation (NAPI) and kernel to kernel backpressure mechanism. UDP guarantees: Packets will never be reordered or dropped before entering the kernel networking stack. However, sending bursts of UDP packets will get them dropped by the kernel because user space cannot read them fast enough. As always: Do not use raw UDP for sending bulk data. Implementation details: There are three hardware resources that this driver uses to implemented the communication: 1. Cross CPU interrupt: When sending a packet an interrupt on the receiving CPU is triggered by the sender to inform it about the available packet. This avoids costly polling and improves latency. 2. SRAM mailbox: We have 1024K fast SRAM memory accessible by both CPUs where we place ring buffers (fifo/queue). These queues are used for signalling (how many packets are available) and to deliver length information about the available packets. The elements of the queue are just 32bit integers (the length of the packet). 3. DRAM mempool: The slower DRAM is used do deliver the payloads of the packets. Each SRAM queue offset correlates to one MTU sized buffer in DRAM. When reading one element from SRAM the receiver implicitly knows the address of the payload and can read it from there. Security: Our assumption is that we cannot trust the other CPU as it might be compromised. Therefore anything received must be checked for sanity. Strictly speaking it is only the bootcore that views the interaptiv as compromised but it is not necessary to make this distinction for the following discussion. There are two ways by which we can receive data from a compromised CPU: SRAM mailbox or DRAM mempool. We discuss both in the following: 1. SRAM mailbox: This is the most critical part as the whole mailbox is read and writeable by both CPUs at any time. To make it worse the read and write pointers of the queues inside the SRAM are used to calculate offsets and could therefore be used to access random memory when not properly bound checked. We argue that our code is secure because we bound check read and write pointers on every access against a maximum capacity known at compile time. The contents of the queue are the sizes of the packets. These are checked against the DRAM buffer size (MTU) known at compile time. 2. DRAM memory: The mempools only contain fixed size buffers with compile time known offsets that are derived from the bound checked SRAM queue offsets. When a packet is received the payload is copied to private memory not accessible by the other CPU. Therefore there is no way for the sender to tamper with the packet contents as soon as the receiver passed it to the networking stack. The validity of the payload itself is not subject to driver checks but is checked by the networking stack and hopefuly by the users of the device (you).
Multi-EVA boot on Lantiq-MIPS:
- SoCs: Seale, Falcon
- Lexicon: Bootcore, Interaptiv, PreEVA, EVA
- Commands: urladerupdate
- Kconfig: CONFIG_BOOTCORE_LOAD_ADDR
- Kconfig: CONFIG_SOC_PRX300_BOOTCORE, CONFIG_PRX300_BOOTCORE_WDT
- Kconfig: CONFIG_SOC_GRX500_BOOTCORE, CONFIG_SERIAL_GRX500_BOOTCORE_CONSOLE
- Kernel: cpunet.ko, grx_switch_console.ko
- Sysfs: switch_console
GPL-Browser
Daily updated index of all cpunet.ko code findings on the GPL-Browser. Last update: 2024-11-14 05:06 GMT.
The Files header attempts to list the files which belong to this module. Useful if a directory contains multiple modules.
The Browse column points to the Path of the Makefile referring this code on the gpl.boxmatrix.info service.
The SoC column lists the Chip-Codenames, the Model column lists the nicks of the Box-Models.
The Diff column links the comparison of the AVM Kernel to the pristine original from Kernel.org.
The Download column links the full tarball the respective directory content is extracted from.
The presence of the source does not mean it fits the respective model and architecture. See the Model-Matrix where it's used.
Note that this list matches module names with hyphen (-) and underscore (_) exchangeable, same as modprobe does.
| Files: cpunet.c, hw.c, main.c | ||||||||
|---|---|---|---|---|---|---|---|---|
| Browse | Path | Makefile | SoC | Arch | Model | Firmw | Diff | Download |
| falcon-5530-730 | packages/cpunet | Kbuild | Falcon | MIPS | 5530 | 7.30 | 4.9.231 | Download |
| falcon-5530-750 | packages/cpunet | Kbuild | Falcon | MIPS | 5530 | 7.50 | 4.9.276 | Download |
| falcon-5590-729 | packages/cpunet | Kbuild | Falcon | MIPS | 5590 | 7.29 | 4.9.231 | - |
| falcon-5590-750 | packages/cpunet | Kbuild | Falcon | MIPS | 5590 | 7.50 | 4.9.276 | Download |
| seale-7590ac-750 | packages/cpunet | Kbuild | Seale | MIPS | 7590ac | 7.50 | 4.9.218 | Download |
| 5 directories containing cpunet.ko source code | ||||||||
Dependencies
Daily updated index of all dependencies of this module. Last update: 2024-11-14 07:43 GMT.
A * in the Mod column marks info from Supportdata-Probes, which will always stay incomplete.
| Relation | Typ | Object | Mod | Firmware | Info | Origin |
|---|---|---|---|---|---|---|
| 0 dependencies for this module | ||||||
Model-Matrix
Daily updated index of the presence, path and size of this module for each model. Last update: 2024-11-14 05:50 GMT.
Showing all models using this module. Click any column header (click-wait-click) to sort the list by the respective data.
The (main/scrpn/boot/arm/prx/atom/rtl) label in the Model column shows which CPU is meant for Multi-Linux models.
Note that this list is merged from Firmware-Probes of all known AVM firmware for a model, including Recovery.exe and Labor-Files.
| Model | Firmware | Path | Size |
|---|---|---|---|
| FRITZ!Box 5530 Fiber (boot) | 7.21 - 8.00 | ./extra | 15.2k - 18.1k |
| FRITZ!Box 5530 Fiber (main) | 7.21 - 8.00 | ./extra | 17.0k - 20.5k |
| FRITZ!Box 5590 Fiber (boot) | 7.29 - 8.00 | ./extra | 15.2k - 18.1k |
| FRITZ!Box 5590 Fiber (prx) | 7.29 - 8.00 | ./extra | 17.0k - 20.5k |
| FRITZ!Box 6850 LTE | 7.26 - 7.39 | ./extra | 17.3k - 17.6k |
| FRITZ!Box 6890 LTE (main) | 7.21 - 7.57 | ./extra | 17.3k - 20.8k |
| FRITZ!Box 6890 LTE v1 (main) | 7.21 - 7.57 | ./extra | 17.3k - 20.8k |
| FRITZ!Box 6890 LTE v2 (main) | 7.21 - 7.57 | ./extra | 17.3k - 20.8k |
| FRITZ!Box 7560 (main) | 7.24 - 7.30 | ./extra | 17.3k |
| FRITZ!Box 7580 (main) | 7.21 - 7.30 | ./extra | 17.3k |
| FRITZ!Box 7583 (main) | 7.21 - 7.59 | ./extra | 17.3k - 20.8k |
| FRITZ!Box 7583 VDSL (main) | 7.19 - 8.00 | ./extra | 17.3k - 20.9k |
| FRITZ!Box 7590 (main) | 7.19 - 8.00 | ./extra, /usr/lib/debug/lib/modules/4.9.325/extra | 17.3k - 420k |
| FRITZ!Box 7590 AX (main) | 7.19 - 8.00 | ./extra, /usr/lib/debug/lib/modules/4.9.325/extra | 17.3k - 420k |
| 14 models use this module | |||
Symbols
Daily updated index of all symbols of this module. Last update: 2024-11-14 07:43 GMT.
| Firmware | Symbol |
|---|---|
| 7.19 - 8.00 | cleanup_module |
| 7.19 - 8.00 | cpunet_driver_exit |
| 7.19 - 8.00 | cpunet_driver_init |
| 7.19 - 8.00 | cpunet_hw_ack_int |
| 7.19 - 8.00 | cpunet_hw_buffer_size |
| 7.19 - 8.00 | cpunet_hw_disable_int |
| 7.19 - 8.00 | cpunet_hw_enable_int |
| 7.19 - 8.00 | cpunet_hw_exit |
| 7.19 - 8.00 | cpunet_hw_init |
| 7.19 - 8.00 | cpunet_hw_max_num |
| 7.19 - 8.00 | cpunet_hw_rx |
| 7.19 - 8.00 | cpunet_hw_rx_done |
| 7.19 - 8.00 | cpunet_hw_tx |
| 7.19 - 8.00 | cpunet_hw_tx_alloc |
| 7.19 - 8.00 | cpunet_hw_tx_full |
| 7.19 - 8.00 | cpunet_isr |
| 7.19 - 8.00 | cpunet_poll |
| 7.19 - 8.00 | cpunet_probe |
| 7.19 - 8.00 | cpunet_remove |
| 7.19 - 8.00 | cpunet_setup |
| 7.19 - 8.00 | cpunet_xmit |
| 7.19 - 8.00 | create_dma |
| 7.21 - 7.30 | exit_mailbox |
| 7.19 - 8.00 | exit_mailbox.isra.2 |
| 7.21 - 8.00 | exit_mailbox.isra.5 |
| 7.19 - 8.00 | exit_mempool |
| 7.19 - 8.00 | get_memory |
| 7.19 - 8.00 | get_phandle |
| 7.19 - 8.00 | init_module |
| 7.21 - 7.30 | queue_is_full |
| 7.19 - 8.00 | queue_is_full.isra.3 |
| 7.19 - 8.00 | remove_device |
| 7.19 - 8.00 | remove_dma |
| 7.19 - 8.00 | timer_retry_rx |
| 34 symbols for this module | |
