mlx5_en_dim.c revision 347796 
1/*-
2 * Copyright (c) 2018 Mellanox Technologies. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: stable/11/sys/dev/mlx5/mlx5_en/mlx5_en_dim.c 347796 2019-05-16 17:09:06Z hselasky $
26 */
27
28#include "en.h"
29
30void
31mlx5e_dim_build_cq_param(struct mlx5e_priv *priv,
32    struct mlx5e_cq_param *param)
33{
34	struct net_dim_cq_moder prof;
35	void *cqc = param->cqc;
36
37	if (priv->params.rx_cq_moderation_mode < 2)
38		return;
39
40	switch (MLX5_GET(cqc, cqc, cq_period_mode)) {
41	case MLX5_CQ_PERIOD_MODE_START_FROM_CQE:
42		prof = net_dim_profile[NET_DIM_CQ_PERIOD_MODE_START_FROM_CQE]
43		    [NET_DIM_DEF_PROFILE_CQE];
44		MLX5_SET(cqc, cqc, cq_period, prof.usec);
45		MLX5_SET(cqc, cqc, cq_max_count, prof.pkts);
46		break;
47
48	case MLX5_CQ_PERIOD_MODE_START_FROM_EQE:
49		prof = net_dim_profile[NET_DIM_CQ_PERIOD_MODE_START_FROM_EQE]
50		    [NET_DIM_DEF_PROFILE_EQE];
51		MLX5_SET(cqc, cqc, cq_period, prof.usec);
52		MLX5_SET(cqc, cqc, cq_max_count, prof.pkts);
53		break;
54	default:
55		break;
56	}
57}
58
59void
60mlx5e_dim_work(struct work_struct *work)
61{
62	struct net_dim *dim = container_of(work, struct net_dim, work);
63	struct mlx5e_rq *rq = container_of(dim, struct mlx5e_rq, dim);
64	struct mlx5e_channel *c = container_of(rq, struct mlx5e_channel, rq);
65	struct net_dim_cq_moder cur_profile;
66	u8 profile_ix;
67	u8 mode;
68
69	/* copy current auto moderation settings and set new state */
70	mtx_lock(&rq->mtx);
71	profile_ix = dim->profile_ix;
72	mode = dim->mode;
73	dim->state = NET_DIM_START_MEASURE;
74	mtx_unlock(&rq->mtx);
75
76	/* check for invalid mode */
77	if (mode == 255)
78		return;
79
80	/* get current profile */
81	cur_profile = net_dim_profile[mode][profile_ix];
82
83	/* apply LRO restrictions */
84	if (c->priv->params.hw_lro_en &&
85	    cur_profile.pkts > MLX5E_DIM_MAX_RX_CQ_MODERATION_PKTS_WITH_LRO) {
86		cur_profile.pkts = MLX5E_DIM_MAX_RX_CQ_MODERATION_PKTS_WITH_LRO;
87	}
88
89	/* modify CQ */
90	mlx5_core_modify_cq_moderation(c->priv->mdev, &rq->cq.mcq,
91	    cur_profile.usec, cur_profile.pkts);
92}
93