Imported Upstream version 17.05

[deb_dpdk.git] / drivers / net / sfc / sfc_tweak.h

diff --git a/drivers/net/sfc/sfc_tweak.h b/drivers/net/sfc/sfc_tweak.h
new file mode 100644 (file)
index 0000000..4ef7fc8
--- /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_ */