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--- tamiwiki:projects:thermalcam [2024/01/02 23:20] – yair
+++ tamiwiki:projects:thermalcam [2024/02/19 23:07] (current) – [kernel driver] yair
@@ Line 119: / Line 119: @@
 TODO:
   * better programmable heat source, with wider thermal range
+====== Linux ======
+make sure all switches support (and dont block) jumbo frames. \\
+enable jumbo frames on your device.
+Jumbo Frames can enhance network performance by allowing larger packets of data to be sent.
+First, identify the network interface you wish to configure. You can list all available network interfaces using:
+<code>
+ip link show
+</code>
+To set the MTU to 9000, use the following command, replacing 'eth0' with your interface name:
+<code>
+sudo ip link set eth0 mtu 9000
+</code>
+After setting the MTU, verify the changes with:
+<code>
+ip addr show eth0
+</code>
+Look for the 'mtu 9000' in the output to confirm the setting.
+**Note:** These changes are temporary and will be reset after a system reboot. To make permanent changes, you need to edit the network configuration file, which varies based on the Linux distribution and network manager in use.
+==== hunting for adapters ====
+alon/paul gave advice and grep to find usb ethernet adapters with Jumbo frame support.
+<code>
+drivers/net/usb$ git grep max_mtu
+aqc111.c:       dev->net->max_mtu = 16334;
+asix_devices.c: dev->net->max_mtu = 16384 - (dev->net->hard_header_len + 4);
+ax88179_178a.c: dev->net->max_mtu = 4088;
+cdc-phonet.c:   dev->max_mtu            = PHONET_MAX_MTU;
+cdc_ncm.c:      dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
+lan78xx.c:      netdev->max_mtu = MAX_SINGLE_PACKET_SIZE;
+qmi_wwan.c:             net->max_mtu = ETH_MAX_MTU;
+r8152.c:                netdev->max_mtu = size_to_mtu(9 * 1024);
+r8152.c:                netdev->max_mtu = size_to_mtu(15 * 1024);
+r8152.c:                netdev->max_mtu = size_to_mtu(16 * 1024);
+r8152.c:                netdev->max_mtu = ETH_DATA_LEN;
+sierra_net.c:   dev->net->max_mtu = SIERRA_NET_MAX_SUPPORTED_MTU;
+smsc75xx.c:     dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
+smsc95xx.c:     dev->net->max_mtu = ETH_DATA_LEN;
+usbnet.c:       net->max_mtu = ETH_MAX_MTU;
+</code>
+this one id as a ''r8152'', and its [[https://github.com/torvalds/linux/blob/master/drivers/net/usb/r8152.c|on the list]]. \\
+spec on the box looks great!
+{{tamiwiki:projects:pxl_20240108_102817262.jpg?x200}}
+<code bash>
+$ lsusb -v -d 0bda:8152
+Bus 001 Device 011: ID 0bda:8152 Realtek Semiconductor Corp. RTL8152 Fast Ethernet Adapter
+Device Descriptor:
+  bcdUSB               2.10
+  bMaxPacketSize0        64
+  idVendor           0x0bda Realtek Semiconductor Corp.
+  idProduct          0x8152 RTL8152 Fast Ethernet Adapter
+  iManufacturer           1 Realtek
+  iProduct                2 USB 10/100 LAN
+  iSerial                 3 00E04C3643B9
+</code>
+mybe we be lucky?\\
+<code bash>
+$ sudo ip link set enp0s20u3 mtu 1501
+Error: mtu greater than device maximum.
+</code>
+{{:tamiwiki:projects:pasted:20240114-203259.png?x400}}
+the inside is a horid mess.
+{{tamiwiki:projects:photo_2024-01-14_20-36-57.jpg?600}}{{tamiwiki:projects:photo_2024-01-14_20-36-59.jpg?x300}}
+but!!!!
+stumbled on another canidate @post office, same case, almost kinda the same packaging, but no mention of jumbo frames on the small print.\\
+doesnt phase me, if they all lie, it can go both ways, no?
+YES, its the ''RTL8153'' \\
+{{tamiwiki:projects:photo_2024-01-14_19-50-02.jpg?600}}
+{{tamiwiki:projects:photo_2024-01-14_19-49-58.jpg?x300}}\\
+{{:tamiwiki:projects:pasted:20240114-194214.png?x300}}
+===== SOB =====
+to get this thing mobile we will need to hook it up to some kind of System On Board. like the raspberry pi and the likes.
+==== raspi ====
+the raspi5 has working jumbo frame (mtu>=6K)
+the RASPI 4/5 support cpi cards, jeff compiled a [[https://pipci.jeffgeerling.com/#network-cards-nics-and-wifi-adapters|nice list]] of netwrok cards you can use with adaptors.
+==== jetson tx2 ====
+we got one, or two. and they have a pci slot.
+TODO\\
+  * check status of mtu on its adaptor board.
 ===== Model 695800 =====
 {{tamiwiki:projects:video_2023-12-23_19-18-34.mp4 }}
@@ Line 137: / Line 245: @@
 ====== downloads ======
 {{tamiwiki:projects:ax88772c_772b_772a_772_win11_64bit_driver_v3.22.0.0.zip}} - apple usb ethernet dongle
+====== kernel driver =====
+Rust in the kernel:
+- instructions neglect to mention you must turn off DEBUG_INFO_BTF
+  - you can discover this by "make LLVM=1 xconfig", then Ctrl-F RUST, then look at the text showing that CONFIG_RUST=N and follow the options, then look at your .config and see that DEBUG_INFO_BTF is y. Turn it to n.

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