File Scan

File Scan (PDF)

NVIDIA DOCA File Scan Application Guide

This document provides a file scan implementation on top of NVIDIA® BlueField® DPU.

BlueField DPU supports high-speed hardware RegEx acceleration using the RegEx engine. This allows accelerating different security and networking applications which require RegEx processing.

The file scan application uses the hardware RegEx engine to scan a file and returns whether there is a match or not. This application can be a base for many security verifications for sensitive data and personal information. File scan logic includes:

  • Compiling RegEx rules using Regex compiler
  • Loading a compiled set of RegEx rules to the BlueField RegEx engine
  • Sending file to the RegEx for scanning
  • HW scanning file and returning a list of matches (e.g., matching rule, offset, length)

File scan utilizes the RegEx engine which is a hardware accelerator on the BlueField.

system-design-diagram.png

The file scan application runs on top of DOCA RegEx API to configure, send, and receive scans to and from the BlueField RegEx engine.

app-arch.png

  1. RegEx rules file is compiled into a rof2.binary file by the user.
  2. The RegEx binary rules file is loaded into the RegEx engine.
  3. The file to scan is sent to the RegEx triggering the engine to start matching
  4. The results are sent back to the application.
    Note:

    It is the application's responsibility to check for finished jobs. In this example, you Busy-Wait until the RegEx finishes scanning.

  5. The matches are printed on the screen, and optionally to a CSV file (which should input to the application, see Running Application).

This application leverages the DOCA RegEx Library.

  1. Parse application argument.
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    doca_arg_init();

    1. Initialize Arg Parser resources.
    2. Register DOCA general flags.
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      register_file_scan_params();

    3. Register file scan application flags.
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      doca_arg_start();

    4. Parsing APP flags.
  2. Initialize file scan resources.
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    file_scan_init();

    1. Initialize DOCA RegEx.
    2. Allocate memory pool and QP.
    3. Start the RegEx engine.
  3. Run the application:
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    file_scan_run();

    1. Initialize jobs.
    2. Enqueue jobs to the RegEx engine.
    3. Dequeue jobs from the RegEx engine and print the results if found.
  4. Clean up the File Scan app.
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    file_scan_cleanup();

    1. Stop and free RegEx resources.
    2. Free application resources.

  1. Refer to the following documents:
  2. The application binary is located under /opt/mellanox/doca/applications/file_scan/bin/doca_file_scan. To build all the applications together, run:
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    cd /opt/mellanox/doca/applications/ meson build ninja -C build

  3. To build the file scan application only:
    1. Edit the following flags in /opt/mellanox/doca/applications/meson_options.txt:
      • Set enable_all_applications to false
      • Set enable_file_scan to true
    2. Run the commands in step 2.
      Note:

      doca_file_scan is created under ./build/file_scan/src/.

    Application usage:

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    Usage: doca_file_scan [DOCA Flags] [Program Flags] DOCA Flags: -h, --help Print a help synopsis -v, --version Print program version information -l, --log-level Set the log level for the program <CRITICAL=20, ERROR=30, WARNING=40, INFO=50, DEBUG=60> Program Flags: -r, --rules <path> Path to compiled rules file (rof2.binary) -d, --data <path> Path to data file -p, --pci_addr <PCI-ADDRESS> RegEx device PCI address -o, --output-csv <path> Path to the output of the CSV file -c, --chunk-size <Number of Bytes> Chunk size of each job sent to the regex, use 0 to send the file as 1 chunk. -s, --overlap-size <Number of Bytes> Number of bytes of overlap to use for huge jobs

    Note:

    The RegEx accelerator must explicitly be initialized on p0.

    Note:

    For additional information on the application, use the -h option:

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    /opt/mellanox/doca/applications/file_scan/bin/doca_file_scan -h


  4. Running application on BlueField:
    • To run the application, the RegEx-compiled rule files must be supplied to the app. These files usually end with *.rof2.binary. To compile the example rules file, run:
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      cd /opt/mellanox/doca/applications/file_scan/bin/ rxpc -f regex_rules.txt -p 0.01 -o /tmp/regex_rules

      The results of the rxpc are written to /tmp/ directory, each file with the prefix regex_rules.
      Note:

      For more information, refer to NVIDIA RXP Compiler.


    • Pre-run setup.
      1. The file scan example is based on the DOCA RegEx library. Therefore, the user is required to allocate huge pages to allow activation of the RegEx engine.
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        sudo echo 2048 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

      2. Make sure the RegEx engine is active:
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        systemctl status mlx-regex

        If the status is inactive (Active: failed), run:
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        systemctl start mlx-regex


      3. Copy the example data file to the tmp directory:
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        cp /opt/mellanox/doca/applications/file_scan/bin/data_to_scan.txt /tmp/data_to_scan.txt

    • CLI example for running the application on BlueField assuming the PCIe address of the DPI is 03:00:
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      cd /opt/mellanox/doca/applications/file_scan/bin/ ./doca_file_scan --pci-addr 03:00.0 --rules /tmp/regex_rules.rof2.binary --data data_to_scan.txt

  5. Running the application on the host, CLI example:
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    cd /opt/mellanox/doca/applications/file_scan/bin/ ./doca_file_scan --pci-addr 21:00.0 --rules /tmp/regex_rules.rof2.binary --data data_to_scan.txt

    Note:

    Sub-functions must be enabled according to the Scalable Function Setup Guide.

  6. To run doca_file_scan using a JSON file:
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    doca_file_scan --json [json_file]

    For example:
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    cd /opt/mellanox/doca/applications/file_scan/bin ./doca_file_scan --json file_scan_params.json

    Note:

    The file scan application prints the results to the standard output.


For more information, refer to NVIDIA DOCA Arg Parser User Guide.

Flag Type Short Flag Long Flag/JSON Key Description JSON Content
General Flags l log-level Set the log level for the application:
  • CRITICAL=20
  • ERROR=30
  • WARNING=40
  • INFO=50
  • DEBUG=60
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"log-level": 60

v version Print program version information N/A
h help Print a help synopsis N/A
Program Flags r rules Path to precompiled rules file (rof2.binary)
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"rules": "/tmp/regex_rules.rof2.binary"

d data Path to data file
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"data": "/tmp/data_to_scan.txt"

p pci-addr RegEx device PCIe address
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"pci-addr": "03:00.0"

o output-csv Path to the output CSV file
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"output-csv": "/tmp/results.csv"

s overlap Number of bytes of overlap to use for huge jobs
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"overlap-size": 0

c chunk-size Chunk size of each job sent to the RegEx
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"chunk-size": 0


  • /opt/mellanox/doca/applications/file_scan/src/file_scan.c
  • /opt/mellanox/doca/applications/file_scan/src/regex_rules.txt
  • /opt/mellanox/doca/applications/file_scan/src/data_to_scan.txt

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