638bddc99f
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com> Reviewed-by: David Riddoch <driddoch@solarflare.com>
108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) 2017 Solarflare Communications Inc.
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* All rights reserved.
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*
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* This software was jointly developed between OKTET Labs (under contract
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* for Solarflare) and Solarflare Communications, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SFC_EF10_H
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#define _SFC_EF10_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Number of events in one cache line */
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#define SFC_EF10_EV_PER_CACHE_LINE \
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(RTE_CACHE_LINE_SIZE / sizeof(efx_qword_t))
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#define SFC_EF10_EV_QCLEAR_MASK (~(SFC_EF10_EV_PER_CACHE_LINE - 1))
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#if defined(SFC_EF10_EV_QCLEAR_USE_EFX)
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static inline void
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sfc_ef10_ev_qclear_cache_line(void *ptr)
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{
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efx_qword_t *entry = ptr;
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unsigned int i;
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for (i = 0; i < SFC_EF10_EV_PER_CACHE_LINE; ++i)
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EFX_SET_QWORD(entry[i]);
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}
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#else
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/*
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* It is possible to do it using AVX2 and AVX512F, but it shows less
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* performance.
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*/
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static inline void
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sfc_ef10_ev_qclear_cache_line(void *ptr)
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{
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const __m128i val = _mm_set1_epi64x(UINT64_MAX);
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__m128i *addr = ptr;
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unsigned int i;
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RTE_BUILD_BUG_ON(sizeof(val) > RTE_CACHE_LINE_SIZE);
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RTE_BUILD_BUG_ON(RTE_CACHE_LINE_SIZE % sizeof(val) != 0);
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for (i = 0; i < RTE_CACHE_LINE_SIZE / sizeof(val); ++i)
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_mm_store_si128(&addr[i], val);
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}
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#endif
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static inline void
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sfc_ef10_ev_qclear(efx_qword_t *hw_ring, unsigned int ptr_mask,
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unsigned int old_read_ptr, unsigned int read_ptr)
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{
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const unsigned int clear_ptr = read_ptr & SFC_EF10_EV_QCLEAR_MASK;
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unsigned int old_clear_ptr = old_read_ptr & SFC_EF10_EV_QCLEAR_MASK;
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while (old_clear_ptr != clear_ptr) {
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sfc_ef10_ev_qclear_cache_line(
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&hw_ring[old_clear_ptr & ptr_mask]);
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old_clear_ptr += SFC_EF10_EV_PER_CACHE_LINE;
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}
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/*
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* No barriers here.
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* Functions which push doorbell should care about correct
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* ordering: store instructions which fill in EvQ ring should be
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* retired from CPU and DMA sync before doorbell which will allow
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* to use these event entries.
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*/
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}
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static inline bool
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sfc_ef10_ev_present(const efx_qword_t ev)
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{
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return ~EFX_QWORD_FIELD(ev, EFX_DWORD_0) |
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~EFX_QWORD_FIELD(ev, EFX_DWORD_1);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SFC_EF10_H */
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