1 // SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
2 
3 /* Ethtool support for Mellanox Gigabit Ethernet driver
4  *
5  * Copyright (C) 2020-2021 NVIDIA CORPORATION & AFFILIATES
6  */
7 
8 #include <linux/phy.h>
9 
10 #include "mlxbf_gige.h"
11 #include "mlxbf_gige_regs.h"
12 
13 /* Start of struct ethtool_ops functions */
14 static int mlxbf_gige_get_regs_len(struct net_device *netdev)
15 {
16 	return MLXBF_GIGE_MMIO_REG_SZ;
17 }
18 
19 static void mlxbf_gige_get_regs(struct net_device *netdev,
20 				struct ethtool_regs *regs, void *p)
21 {
22 	struct mlxbf_gige *priv = netdev_priv(netdev);
23 
24 	regs->version = MLXBF_GIGE_REGS_VERSION;
25 
26 	/* Read entire MMIO register space and store results
27 	 * into the provided buffer. Each 64-bit word is converted
28 	 * to big-endian to make the output more readable.
29 	 *
30 	 * NOTE: by design, a read to an offset without an existing
31 	 *       register will be acknowledged and return zero.
32 	 */
33 	memcpy_fromio(p, priv->base, MLXBF_GIGE_MMIO_REG_SZ);
34 }
35 
36 static void mlxbf_gige_get_ringparam(struct net_device *netdev,
37 				     struct ethtool_ringparam *ering)
38 {
39 	struct mlxbf_gige *priv = netdev_priv(netdev);
40 
41 	ering->rx_max_pending = MLXBF_GIGE_MAX_RXQ_SZ;
42 	ering->tx_max_pending = MLXBF_GIGE_MAX_TXQ_SZ;
43 	ering->rx_pending = priv->rx_q_entries;
44 	ering->tx_pending = priv->tx_q_entries;
45 }
46 
47 static const struct {
48 	const char string[ETH_GSTRING_LEN];
49 } mlxbf_gige_ethtool_stats_keys[] = {
50 	{ "hw_access_errors" },
51 	{ "tx_invalid_checksums" },
52 	{ "tx_small_frames" },
53 	{ "tx_index_errors" },
54 	{ "sw_config_errors" },
55 	{ "sw_access_errors" },
56 	{ "rx_truncate_errors" },
57 	{ "rx_mac_errors" },
58 	{ "rx_din_dropped_pkts" },
59 	{ "tx_fifo_full" },
60 	{ "rx_filter_passed_pkts" },
61 	{ "rx_filter_discard_pkts" },
62 };
63 
64 static int mlxbf_gige_get_sset_count(struct net_device *netdev, int stringset)
65 {
66 	if (stringset != ETH_SS_STATS)
67 		return -EOPNOTSUPP;
68 	return ARRAY_SIZE(mlxbf_gige_ethtool_stats_keys);
69 }
70 
71 static void mlxbf_gige_get_strings(struct net_device *netdev, u32 stringset,
72 				   u8 *buf)
73 {
74 	if (stringset != ETH_SS_STATS)
75 		return;
76 	memcpy(buf, &mlxbf_gige_ethtool_stats_keys,
77 	       sizeof(mlxbf_gige_ethtool_stats_keys));
78 }
79 
80 static void mlxbf_gige_get_ethtool_stats(struct net_device *netdev,
81 					 struct ethtool_stats *estats,
82 					 u64 *data)
83 {
84 	struct mlxbf_gige *priv = netdev_priv(netdev);
85 
86 	/* Fill data array with interface statistics
87 	 *
88 	 * NOTE: the data writes must be in
89 	 *       sync with the strings shown in
90 	 *       the mlxbf_gige_ethtool_stats_keys[] array
91 	 *
92 	 * NOTE2: certain statistics below are zeroed upon
93 	 *        port disable, so the calculation below
94 	 *        must include the "cached" value of the stat
95 	 *        plus the value read directly from hardware.
96 	 *        Cached statistics are currently:
97 	 *          rx_din_dropped_pkts
98 	 *          rx_filter_passed_pkts
99 	 *          rx_filter_discard_pkts
100 	 */
101 	*data++ = priv->stats.hw_access_errors;
102 	*data++ = priv->stats.tx_invalid_checksums;
103 	*data++ = priv->stats.tx_small_frames;
104 	*data++ = priv->stats.tx_index_errors;
105 	*data++ = priv->stats.sw_config_errors;
106 	*data++ = priv->stats.sw_access_errors;
107 	*data++ = priv->stats.rx_truncate_errors;
108 	*data++ = priv->stats.rx_mac_errors;
109 	*data++ = (priv->stats.rx_din_dropped_pkts +
110 		   readq(priv->base + MLXBF_GIGE_RX_DIN_DROP_COUNTER));
111 	*data++ = priv->stats.tx_fifo_full;
112 	*data++ = (priv->stats.rx_filter_passed_pkts +
113 		   readq(priv->base + MLXBF_GIGE_RX_PASS_COUNTER_ALL));
114 	*data++ = (priv->stats.rx_filter_discard_pkts +
115 		   readq(priv->base + MLXBF_GIGE_RX_DISC_COUNTER_ALL));
116 }
117 
118 static void mlxbf_gige_get_pauseparam(struct net_device *netdev,
119 				      struct ethtool_pauseparam *pause)
120 {
121 	pause->autoneg = AUTONEG_DISABLE;
122 	pause->rx_pause = 1;
123 	pause->tx_pause = 1;
124 }
125 
126 const struct ethtool_ops mlxbf_gige_ethtool_ops = {
127 	.get_link		= ethtool_op_get_link,
128 	.get_ringparam		= mlxbf_gige_get_ringparam,
129 	.get_regs_len           = mlxbf_gige_get_regs_len,
130 	.get_regs               = mlxbf_gige_get_regs,
131 	.get_strings            = mlxbf_gige_get_strings,
132 	.get_sset_count         = mlxbf_gige_get_sset_count,
133 	.get_ethtool_stats      = mlxbf_gige_get_ethtool_stats,
134 	.nway_reset		= phy_ethtool_nway_reset,
135 	.get_pauseparam		= mlxbf_gige_get_pauseparam,
136 	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
137 };
138