Bash reimplementation of https://gist.github.com/ixs/dbaac42730dea9bd124f26cbd439c58e

intel_x520_patcher.sh

#!/usr/bin/env bash
#
# Simple Intel x520 EEPROM patcher
# Modifies the EEPROM to unlock the card for non-intel branded SFP modules.
#
# Copyright 2024 Ivan Vatlin <[email protected]>
#
# Licensed under the GPLv3
#
# Based on research described at https://forums.servethehome.com/index.php?threads/patching-intel-x520-eeprom-to-unlock-all-sfp-transceivers.24634/
#
# Quick explanation of what's going on:
# Looking at the Intel driver at e.g. https://elixir.bootlin.com/linux/v5.8/source/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h#L2140 we can see
# that the bit 0x1 at Address 0x58 contains a configuration setting whether the card allows any SFP modules or if Intel specific ones are enforced
# by the driver.
#
# Addr Bitstring
# 0x58 xxxxxxx0 means Intel specific SFPs
# 0x58 xxxxxxx1 means any SFP is allowed.
#
# Using the parameter allow_unsupported_sfp for the kernel module we can tell the driver to accept any SFPs.
# But this tool will flip the right bit 1 to make that change permanent in the configuration bits in the EEPROM,
# thus making kernel module parameters unnecessary.
#
# export YOLO=1 for auto usage if you are brave enough
yolo=${YOLO:-0}

intel="0x8086"

declare -A x520_card_ids=( ["0x10fb"]="82599ES 10-Gigabit SFI/SFP+ Network Connection" ["0x154d"]="Ethernet 10G 2P X520 Adapter" )
# declare -A x710_card_ids=( ["0x1572"]="Ethernet Controller X710 for 10GbE SFP+" )

function verify_interface {
    local interface=$1
    local vendor_id="$(cat /sys/class/net/$interface/device/vendor)"
    local device_id="$(cat /sys/class/net/$interface/device/device)"
    if [[ -z $vendor_id || -z $device_id ]]; then
        printf "%s: can't read interface data, skipping...\n" "$interface"
        return
    fi
    if [[ $vendor_id == "$intel" ]]; then
        printf "%s: recognized an Intel manufactured card\n" "$interface"
    else
        printf "%s: not an Intel manufactured card, skipping...\n" "$interface"
        return
    fi
    if [[ "${!x520_card_ids[*]}" =~ $device_id ]]; then
        printf "%s: recognized the %s card\n" "$interface" "${x520_card_ids[$device_id]}"
        unlock_x520 "$interface" "$vendor_id" "$device_id"
    # elif [[ "${!x710_card_ids[*]}" =~ $device_id ]]; then
    #    printf "%s: recognized the %s card\n" "$interface" "${x710_card_ids[$device_id]}"
    #    unlock_x710 $interface
    else
        printf "%s: not a supported card, skipping...\n" "$interface"
        return
    fi
    return
}

function unlock_x520 {
    local interface=$1
    local vendor_id=$2
    local device_id=$3
    local magic="${device_id}${vendor_id:2}"
    # get current bit
    local current_eeprom_value_hex="$(ethtool -e $interface offset 0x58 length 1 raw on | hexdump -e '"%2x"')"
    local current_eeprom_value="$((16#$current_eeprom_value_hex))"
    if [[ -z $current_eeprom_value_hex ]]; then
        printf "%s: failed to get EEPROM value, is ethtool installed?\n" "$interface"
        return
    elif (( ($current_eeprom_value & 0x1) == 0x1 )); then
        printf "%s: card is already unlocked, skipping...\n" "$interface"
        return
    else
        local new_eeprom_value=$((current_eeprom_value | 1))
        local new_eeprom_value_hex=$( (printf '%x' $new_eeprom_value) )
        local unlock_cmd=("ethtool" "-E" "${interface}" "magic" "${magic}" "offset" "0x58" "value" "0x${new_eeprom_value_hex}" "length" "1")
        if [[ $yolo -eq 0 ]]; then
            printf "%s: about to run %s\n" "$interface" "${unlock_cmd[*]}"
            printf "%s: this operation will write data to your ethernet card eeprom. Type 'yes' to confirm: \n" "$interface"
            read -r answer
            if [[ ${answer,,} != "yes" ]]; then
                printf "%s: operation aborted, skipping...\n" "$interface"
                return
            else
                "${unlock_cmd[@]}"
            fi
        else
            printf "%s: running %s" "$interface" "${unlock_cmd[*]}"
            "${unlock_cmd[@]}"
        fi
    fi
    # check if bit is actually set
    if [[ "$(ethtool -e $interface offset 0x58 length 1 raw on | hexdump -e '"%2x"')" == $new_eeprom_value_hex ]]; then
        printf "%s: successfully unlocked, reboot for changes to take effect\n" "$interface"
    fi
}

# function unlock_x710 {}

if [[ -z $1 ]]; then
        printf "%s <interfaces>\n" "$0"
        exit 255
fi

while [[ $# -gt 0 ]]; do
    verify_interface "$1"
    shift
done

Hi,

Complete and utter guide follower here. How does one run this to unlock an x520? Im on windows but will booting into an Ubuntu Desktop live environment work? Any other prerequisites? Many thanks in advance!

Thanks @jeffangelion!

How does one run this to unlock an x520?

@melonhaus you can use any Linux distribution with root shell or sudo and recent version of ethtool but I highly recommend to use Clonezilla as live environment (it has an option to enter shell and using old interface name convention ethX) and run something like:
$ ./intel_x520_patcher.sh your_interface_here
You can get interface name by invoking a command:
$ ip -c a
Or, you can use a very brute approach:

$ sudo -i
# YOLO=1 ./intel_x520_patcher.sh eth{0..255}

While I can confirm its results in my environment, I can't confirm it'll work for you (thus it's your own responsibility)