linux/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.h
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   1/*
   2 * Copyright (c) 2017, Mellanox Technologies, Ltd.  All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#ifndef __LIB_CLOCK_H__
  34#define __LIB_CLOCK_H__
  35
  36static inline bool mlx5_is_real_time_rq(struct mlx5_core_dev *mdev)
  37{
  38        u8 rq_ts_format_cap = MLX5_CAP_GEN(mdev, rq_ts_format);
  39
  40        return (rq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
  41                rq_ts_format_cap ==
  42                        MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
  43}
  44
  45static inline bool mlx5_is_real_time_sq(struct mlx5_core_dev *mdev)
  46{
  47        u8 sq_ts_format_cap = MLX5_CAP_GEN(mdev, sq_ts_format);
  48
  49        return (sq_ts_format_cap == MLX5_TIMESTAMP_FORMAT_CAP_REAL_TIME ||
  50                sq_ts_format_cap ==
  51                        MLX5_TIMESTAMP_FORMAT_CAP_FREE_RUNNING_AND_REAL_TIME);
  52}
  53
  54typedef ktime_t (*cqe_ts_to_ns)(struct mlx5_clock *, u64);
  55
  56#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
  57void mlx5_init_clock(struct mlx5_core_dev *mdev);
  58void mlx5_cleanup_clock(struct mlx5_core_dev *mdev);
  59
  60static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
  61{
  62        return mdev->clock.ptp ? ptp_clock_index(mdev->clock.ptp) : -1;
  63}
  64
  65static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
  66                                                u64 timestamp)
  67{
  68        struct mlx5_timer *timer = &clock->timer;
  69        unsigned int seq;
  70        u64 nsec;
  71
  72        do {
  73                seq = read_seqbegin(&clock->lock);
  74                nsec = timecounter_cyc2time(&timer->tc, timestamp);
  75        } while (read_seqretry(&clock->lock, seq));
  76
  77        return ns_to_ktime(nsec);
  78}
  79
  80#define REAL_TIME_TO_NS(hi, low) (((u64)hi) * NSEC_PER_SEC + ((u64)low))
  81
  82static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
  83                                              u64 timestamp)
  84{
  85        u64 time = REAL_TIME_TO_NS(timestamp >> 32, timestamp & 0xFFFFFFFF);
  86
  87        return ns_to_ktime(time);
  88}
  89#else
  90static inline void mlx5_init_clock(struct mlx5_core_dev *mdev) {}
  91static inline void mlx5_cleanup_clock(struct mlx5_core_dev *mdev) {}
  92static inline int mlx5_clock_get_ptp_index(struct mlx5_core_dev *mdev)
  93{
  94        return -1;
  95}
  96
  97static inline ktime_t mlx5_timecounter_cyc2time(struct mlx5_clock *clock,
  98                                                u64 timestamp)
  99{
 100        return 0;
 101}
 102
 103static inline ktime_t mlx5_real_time_cyc2time(struct mlx5_clock *clock,
 104                                              u64 timestamp)
 105{
 106        return 0;
 107}
 108#endif
 109
 110static inline cqe_ts_to_ns mlx5_rq_ts_translator(struct mlx5_core_dev *mdev)
 111{
 112        return mlx5_is_real_time_rq(mdev) ? mlx5_real_time_cyc2time :
 113                                            mlx5_timecounter_cyc2time;
 114}
 115
 116static inline cqe_ts_to_ns mlx5_sq_ts_translator(struct mlx5_core_dev *mdev)
 117{
 118        return mlx5_is_real_time_sq(mdev) ? mlx5_real_time_cyc2time :
 119                                            mlx5_timecounter_cyc2time;
 120}
 121#endif
 122