[ceph.git] / ceph / src / seastar / dpdk / drivers / net / sfc / sfc_tweak.h

/* 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_ */
Commit	Line	Data
9f95a23c	1	/* SPDX-License-Identifier: BSD-3-Clause
11fdf7f2	2	*
9f95a23c	3	* Copyright (c) 2016-2018 Solarflare Communications Inc.
11fdf7f2 TL	4	* All rights reserved.
	5	*
	6	* This software was jointly developed between OKTET Labs (under contract
	7	* for Solarflare) and Solarflare Communications, Inc.
11fdf7f2 TL	8	*/
	9
	10	#ifndef _SFC_TWEAK_H_
	11	#define _SFC_TWEAK_H_
	12
	13	/*
	14	* The header is intended to collect defines/constants which could be
	15	* tweaked to improve the PMD performance characteristics depending on
	16	* the usecase or requirements (CPU load, packet rate, latency).
	17	*/
	18
	19	/**
	20	* Number of Rx descriptors in the bulk submitted on Rx ring refill.
	21	*/
	22	#define SFC_RX_REFILL_BULK (RTE_CACHE_LINE_SIZE / sizeof(efx_qword_t))
	23
	24	/**
	25	* Make the transmit path reap at least one time per a burst;
	26	* this improves cache locality because the same mbufs may be used to send
	27	* subsequent bursts in certain cases because of well-timed reap
	28	*/
	29	#define SFC_TX_XMIT_PKTS_REAP_AT_LEAST_ONCE 0
	30
	31	/** Default free threshold follows recommendations from DPDK documentation */
	32	#define SFC_TX_DEFAULT_FREE_THRESH 32
	33
9f95a23c TL	34	/** Number of mbufs to be freed in bulk in a single call */
	35	#define SFC_TX_REAP_BULK_SIZE 32
	36
	37	/**
	38	* Default head-of-line block timeout to wait for Rx descriptor before
	39	* packet drop because of no descriptors available.
	40	*
	41	* DPDK FW variant only with equal stride super-buffer Rx mode.
	42	*/
	43	#define SFC_RXD_WAIT_TIMEOUT_NS_DEF (200U * 1000)
	44
11fdf7f2	45	#endif /* _SFC_TWEAK_H_ */