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Diffstat (limited to 'drivers/net/sfc/sfc_tweak.h')
| -rw-r--r-- | drivers/net/sfc/sfc_tweak.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/net/sfc/sfc_tweak.h b/drivers/net/sfc/sfc_tweak.h new file mode 100644 index 00000000..4ef7fc8b --- /dev/null +++ b/drivers/net/sfc/sfc_tweak.h @@ -0,0 +1,56 @@ +/*- + * 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 + +#endif /* _SFC_TWEAK_H_ */ |