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/* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2016-2018 Solarflare Communications Inc.
* All rights reserved.
*
* This software was jointly developed between OKTET Labs (under contract
* for Solarflare) and Solarflare Communications, Inc.
*/
#ifndef _SFC_TWEAK_H_
#define _SFC_TWEAK_H_
/*
* The header is intended to collect defines/constants which could be
* tweaked to improve the PMD performance characteristics depending on
* the usecase or requirements (CPU load, packet rate, latency).
*/
/**
* Number of Rx descriptors in the bulk submitted on Rx ring refill.
*/
#define SFC_RX_REFILL_BULK (RTE_CACHE_LINE_SIZE / sizeof(efx_qword_t))
/**
* Make the transmit path reap at least one time per a burst;
* this improves cache locality because the same mbufs may be used to send
* subsequent bursts in certain cases because of well-timed reap
*/
#define SFC_TX_XMIT_PKTS_REAP_AT_LEAST_ONCE 0
/** Default free threshold follows recommendations from DPDK documentation */
#define SFC_TX_DEFAULT_FREE_THRESH 32
/** Number of mbufs to be freed in bulk in a single call */
#define SFC_TX_REAP_BULK_SIZE 32
/**
* Default head-of-line block timeout to wait for Rx descriptor before
* packet drop because of no descriptors available.
*
* DPDK FW variant only with equal stride super-buffer Rx mode.
*/
#define SFC_RXD_WAIT_TIMEOUT_NS_DEF (200U * 1000)
#endif /* _SFC_TWEAK_H_ */
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