Signed-off-by: Valentin Obst <[email protected]>

When generating the `rust-project.json`, also search for modules in the
`net/` folder.

Signed-off-by: Valentin Obst <[email protected]>

This allows modules to be initialised in-place in pinned memory, which
enables the usage of pinned types (e.g., mutexes, spinlocks, driver
registrations, etc.) in modules without any extra allocations.

Drivers that don't need this may continue to implement `Module` without
any changes.

Signed-off-by: Wedson Almeida Filho <[email protected]>
[[email protected]: remove feature return_position_impl_trait_in_trait
as it is now stabilised]
[[email protected]: remove `Send` trait bound on `Module` and
`InPlaceModule`]

We'll need it, for example, when calling `register_filesystem` to
initialise a file system registration.

Signed-off-by: Wedson Almeida Filho <[email protected]>

In net/tcp time values are usually 32bit wide unsigned integers, and
either in units of jiffies, microseconds or milliseconds. Add types,
constants, and functions to work with 32bit time values.

This is, for example, used in the CUBIC and BIC CCAs.

Signed-off-by: Valentin Obst <[email protected]>

Add a macro to determine the size of a structure field at compile time.
This is used by the CCA abstractions to ensure that the private data of
every CCA will fit into the space that the kernel provides for it.

Signed-off-by: Valentin Obst <[email protected]>

# Describe the purpose of this series. The information you put here
# will be used by the project maintainer to make a decision whether
# your patches should be reviewed, and in what priority order. Please be
# very detailed and link to any relevant discussions or sites that the
# maintainer can review to better understand your proposed changes. If you
# only have a single patch in your series, the contents of the cover
# letter will be appended to the "under-the-cut" portion of the patch.

# Lines starting with # will be removed from the cover letter. You can
# use them to add notes or reminders to yourself. If you want to use
# markdown headers in your cover letter, start the line with ">#".

# You can add trailers to the cover letter. Any email addresses found in
# these trailers will be added to the addresses specified/generated
# during the b4 send stage. You can also run "b4 prep --auto-to-cc" to
# auto-populate the To: and Cc: trailers based on the code being
# modified.

Signed-off-by: Valentin Obst <[email protected]>

--- b4-submit-tracking ---
# This section is used internally by b4 prep for tracking purposes.
{
  "series": {
    "revision": 1,
    "change-id": "20240301-tcp-cca-rfc-1a0fbcaa533c",
    "prefixes": []
  }
}

Signed-off-by: Valentin Obst <[email protected]>

Signed-off-by: Valentin Obst <[email protected]>

Add an example that uses the `module_cca` macro and the `Algorithm`
trait to implement a minimal CCA.

IMPORTANT: This CCA is not compliant with the relevant RFCs and must not
be used outside of test environments.

Signed-off-by: Valentin Obst <[email protected]>

Reimplement the Binary Increase Congestion (BIC) control algorithm in
Rust. BIC is one of the smallest CCAs in the kernel and this mainly
serves as a minimal example for a real-world algorithm.

Signed-off-by: Valentin Obst <[email protected]>

Signed-off-by: Valentin Obst <[email protected]>

CUBIC is the default CCA since 2.6.18.

Missing features compared to the C implementation:
- configuration via module parameters,
- exporting callbacks to BPF programs as kfuncs.

Changes compared to the C implementation:
- uses only SI units for time, i.e., no jiffies and `BICTCP_HZ`,

Signed-off-by: Valentin Obst <[email protected]>