Imported Upstream version 17.05

[deb_dpdk.git] / drivers / net / sfc / sfc_ef10.h

diff --git a/drivers/net/sfc/sfc_ef10.h b/drivers/net/sfc/sfc_ef10.h
new file mode 100644 (file)
index 0000000..060d8fe
--- /dev/null
+++ b/drivers/net/sfc/sfc_ef10.h
@@ -0,0 +1,107 @@
+/*-
+ *   BSD LICENSE
+ *
+ * Copyright (c) 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_EF10_H
+#define _SFC_EF10_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Number of events in one cache line */
+#define SFC_EF10_EV_PER_CACHE_LINE \
+       (RTE_CACHE_LINE_SIZE / sizeof(efx_qword_t))
+
+#define SFC_EF10_EV_QCLEAR_MASK                (~(SFC_EF10_EV_PER_CACHE_LINE - 1))
+
+#if defined(SFC_EF10_EV_QCLEAR_USE_EFX)
+static inline void
+sfc_ef10_ev_qclear_cache_line(void *ptr)
+{
+       efx_qword_t *entry = ptr;
+       unsigned int i;
+
+       for (i = 0; i < SFC_EF10_EV_PER_CACHE_LINE; ++i)
+               EFX_SET_QWORD(entry[i]);
+}
+#else
+/*
+ * It is possible to do it using AVX2 and AVX512F, but it shows less
+ * performance.
+ */
+static inline void
+sfc_ef10_ev_qclear_cache_line(void *ptr)
+{
+       const __m128i val = _mm_set1_epi64x(UINT64_MAX);
+       __m128i *addr = ptr;
+       unsigned int i;
+
+       RTE_BUILD_BUG_ON(sizeof(val) > RTE_CACHE_LINE_SIZE);
+       RTE_BUILD_BUG_ON(RTE_CACHE_LINE_SIZE % sizeof(val) != 0);
+
+       for (i = 0; i < RTE_CACHE_LINE_SIZE / sizeof(val); ++i)
+               _mm_store_si128(&addr[i], val);
+}
+#endif
+
+static inline void
+sfc_ef10_ev_qclear(efx_qword_t *hw_ring, unsigned int ptr_mask,
+                  unsigned int old_read_ptr, unsigned int read_ptr)
+{
+       const unsigned int clear_ptr = read_ptr & SFC_EF10_EV_QCLEAR_MASK;
+       unsigned int old_clear_ptr = old_read_ptr & SFC_EF10_EV_QCLEAR_MASK;
+
+       while (old_clear_ptr != clear_ptr) {
+               sfc_ef10_ev_qclear_cache_line(
+                       &hw_ring[old_clear_ptr & ptr_mask]);
+               old_clear_ptr += SFC_EF10_EV_PER_CACHE_LINE;
+       }
+
+       /*
+        * No barriers here.
+        * Functions which push doorbell should care about correct
+        * ordering: store instructions which fill in EvQ ring should be
+        * retired from CPU and DMA sync before doorbell which will allow
+        * to use these event entries.
+        */
+}
+
+static inline bool
+sfc_ef10_ev_present(const efx_qword_t ev)
+{
+       return ~EFX_QWORD_FIELD(ev, EFX_DWORD_0) |
+              ~EFX_QWORD_FIELD(ev, EFX_DWORD_1);
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _SFC_EF10_H */