File Scan
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)
The file scan application runs on top of DOCA RegEx API to configure, send, and receive scans to and from the BlueField RegEx engine.
- RegEx rules file is compiled into a
rof2.binary
file by the user. - The RegEx binary rules file is loaded into the RegEx engine.
- The file to scan is sent to the RegEx triggering the engine to start matching
- 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.
- 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.
- Parse application argument.
doca_arg_init();
- Initialize Arg Parser resources.
- Register DOCA general flags.
register_file_scan_params();
- Register file scan application flags.
doca_arg_start();
- Parsing APP flags.
- Initialize file scan resources.
file_scan_init();
- Initialize DOCA RegEx.
- Allocate memory pool and QP.
- Start the RegEx engine.
- Initialize job request.
init_job_request();
- Set the job buffer and job length.
- Allocate mbuf pool.
allocate_mbuf_pool();
- Allocate mbuf memory pool to hold the file buffer.
- Enqueue RegEx job.
File_scan_enqueue_job();
- Send job to the RegEx engine.
- Dequeue RegEx scan task.
file_scan_dequeue_job();
- Dequeue from the RegEx queue.
- Report results if found.
- Clean up the File Scan app.
file_scan_cleanup();
- Stop and free RegEx resources.
- Free application resources.
- Refer to the following documents:
- for details on how to install BlueField-related software.
- NVIDIA DOCA Troubleshooting Guide for any issue you may encounter with the installation, compilation, or execution of DOCA applications.
- The application binary is located under
/opt/mellanox/doca/applications/file_scan/bin/doca_file_scan
. To build all the applications together, run:cd /opt/mellanox/doca/applications/ meson build ninja -C build
- To build the file scan application only:
- Edit the following flags in
/opt/mellanox/doca/applications/meson_option.txt
:- Set
enable_all_applications
tofalse
- Set
enable_file_scan
totrue
- Set
- Run the commands in step 2.
Note:
doca_file_scan
is created under./build/file_scan/src/
.
Application usage:
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=0, DEBUG=4> 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:
/opt/mellanox/doca/applications/file_scan/bin/doca_file_scan -h
- Edit the following flags in
- 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:cd /opt/mellanox/doca/applications/file_scan/bin/ rxpc -f regex_rules.txt -p 0.01 -o /tmp/regex_rules
rxpc
are written to/tmp/
directory, each file with the prefixregex_rules
.Note:For more information, refer to NVIDIA RXP Compiler.
- Pre-run setup.
Make sure the RegEx engine is active:
systemctl status mlx-regex
If the status is inactive (
Active: failed
), run:systemctl start mlx-regex
Copy the example data file to thetmp
directory: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
: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
- To run the application, the RegEx-compiled rule files must be supplied to the app. These files usually end with
- Running the application on the host, CLI example:
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.
- To run
doca_file_scan
using a JSON file:doca_file_scan --json [json_file]
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:
|
|
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 )
Note:
|
|
d | data | Path to data file
Note:
|
|
|
p | pci-addr | RegEx device PCIe address |
|
|
o | output-csv | Path to the output CSV file |
|
|
s | overlap | Number of bytes of overlap to use for huge jobs |
|
|
c | chunk-size | Chunk size of each job sent to the RegEx |
|
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