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/* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2017-2018 Solarflare Communications Inc.
* All rights reserved.
*
* This software was jointly developed between OKTET Labs (under contract
* for Solarflare) and Solarflare Communications, Inc.
*/
#ifndef _SFC_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 */
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