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/*-
* BSD LICENSE
*
* Copyright (c) 2016-2017 Solarflare Communications Inc.
* All rights reserved.
*
* This software was jointly developed between OKTET Labs (under contract
* for Solarflare) and Solarflare Communications, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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
#endif /* _SFC_TWEAK_H_ */
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