RE: [PATCH v12 16/26] net/dpaa: add Tx rate limiting API

> From: Hemant Agrawal [mailto:[email protected]]
> Sent: Tuesday, 18 August 2026 13.17
> To: [email protected]; [email protected]; [email protected]
> Subject: [PATCH v12 16/26] net/dpaa: add Tx rate limiting API
> 
> Add a DPAA PMD API to configure the transmit rate limit (rate and
> burst) on a DPAA port, using the FMAN port rate limiter.
> 
> Signed-off-by: Hemant Agrawal <[email protected]>
> ---
> diff --git a/drivers/net/dpaa/rte_pmd_dpaa.h
> b/drivers/net/dpaa/rte_pmd_dpaa.h
> index 0a57e2097a..680ff387f8 100644
> --- a/drivers/net/dpaa/rte_pmd_dpaa.h
> +++ b/drivers/net/dpaa/rte_pmd_dpaa.h
> @@ -1,11 +1,12 @@
>  /* SPDX-License-Identifier: BSD-3-Clause
> - * Copyright 2018 NXP
> + * Copyright 2018,2022 NXP
>   */
> 
>  #ifndef _PMD_DPAA_H_
>  #define _PMD_DPAA_H_
> 
>  #include <stdint.h>
> +#include <rte_compat.h>
> 
>  /**
>   * @file rte_pmd_dpaa.h
> @@ -33,4 +34,24 @@
>  int
>  rte_pmd_dpaa_set_tx_loopback(uint16_t port, uint8_t on);
> 
> +/**
> + * Set TX rate limit
> + *
> + * @param port_id
> + *    The port identifier of the Ethernet device.
> + * @param burst
> + *    Max burst size(KBytes) of the Ethernet device.
> + *    0 - Disable TX rate limit.
> + * @param rate
> + *    Max rate(Kb/sec) of the Ethernet device.
> + *    0 - Disable TX rate limit.
> + * @return
> + *    0 - if successful.
> + *    <0 - if failed, with proper error code.
> + */
> +__rte_experimental
> +int
> +rte_pmd_dpaa_port_set_rate_limit(uint16_t port_id, uint16_t burst,
> +				 uint32_t rate);
> +
>  #endif /* _PMD_DPAA_H_ */
> --
> 2.25.1

We already have a generic API for per-queue TX rate limit: rte_eth_set_queue_rate_limit().

Let's have a generic API for per-port TX rate limit, instead of a device-specific API.

The per-queue API doesn't support burst size, but the per-port API could.
It could be noted in the API description that if a port doesn't support burst capacity, the "burst" parameter will be ignored.