1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "netlink.h" 4 #include "common.h" 5 6 struct pause_req_info { 7 struct ethnl_req_info base; 8 enum ethtool_mac_stats_src src; 9 }; 10 11 #define PAUSE_REQINFO(__req_base) \ 12 container_of(__req_base, struct pause_req_info, base) 13 14 struct pause_reply_data { 15 struct ethnl_reply_data base; 16 struct ethtool_pauseparam pauseparam; 17 struct ethtool_pause_stats pausestat; 18 }; 19 20 #define PAUSE_REPDATA(__reply_base) \ 21 container_of(__reply_base, struct pause_reply_data, base) 22 23 const struct nla_policy ethnl_pause_get_policy[] = { 24 [ETHTOOL_A_PAUSE_HEADER] = 25 NLA_POLICY_NESTED(ethnl_header_policy_stats), 26 [ETHTOOL_A_PAUSE_STATS_SRC] = 27 NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC), 28 }; 29 30 static int pause_parse_request(struct ethnl_req_info *req_base, 31 struct nlattr **tb, 32 struct netlink_ext_ack *extack) 33 { 34 enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE; 35 struct pause_req_info *req_info = PAUSE_REQINFO(req_base); 36 37 if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) { 38 if (!(req_base->flags & ETHTOOL_FLAG_STATS)) { 39 NL_SET_ERR_MSG_MOD(extack, 40 "ETHTOOL_FLAG_STATS must be set when requesting a source of stats"); 41 return -EINVAL; 42 } 43 44 src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]); 45 } 46 47 req_info->src = src; 48 49 return 0; 50 } 51 52 static int pause_prepare_data(const struct ethnl_req_info *req_base, 53 struct ethnl_reply_data *reply_base, 54 const struct genl_info *info) 55 { 56 const struct pause_req_info *req_info = PAUSE_REQINFO(req_base); 57 struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 58 enum ethtool_mac_stats_src src = req_info->src; 59 struct net_device *dev = reply_base->dev; 60 int ret; 61 62 if (!dev->ethtool_ops->get_pauseparam) 63 return -EOPNOTSUPP; 64 65 ethtool_stats_init((u64 *)&data->pausestat, 66 sizeof(data->pausestat) / 8); 67 data->pausestat.src = src; 68 69 ret = ethnl_ops_begin(dev); 70 if (ret < 0) 71 return ret; 72 73 if ((src == ETHTOOL_MAC_STATS_SRC_EMAC || 74 src == ETHTOOL_MAC_STATS_SRC_PMAC) && 75 !__ethtool_dev_mm_supported(dev)) { 76 NL_SET_ERR_MSG_MOD(info->extack, 77 "Device does not support MAC merge layer"); 78 ethnl_ops_complete(dev); 79 return -EOPNOTSUPP; 80 } 81 82 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam); 83 if (req_base->flags & ETHTOOL_FLAG_STATS && 84 dev->ethtool_ops->get_pause_stats) 85 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat); 86 87 ethnl_ops_complete(dev); 88 89 return 0; 90 } 91 92 static int pause_reply_size(const struct ethnl_req_info *req_base, 93 const struct ethnl_reply_data *reply_base) 94 { 95 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */ 96 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */ 97 nla_total_size(sizeof(u8)); /* _PAUSE_TX */ 98 99 if (req_base->flags & ETHTOOL_FLAG_STATS) 100 n += nla_total_size(0) + /* _PAUSE_STATS */ 101 nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */ 102 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT; 103 return n; 104 } 105 106 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype, 107 u16 padtype) 108 { 109 if (val == ETHTOOL_STAT_NOT_SET) 110 return 0; 111 if (nla_put_u64_64bit(skb, attrtype, val, padtype)) 112 return -EMSGSIZE; 113 114 return 0; 115 } 116 117 static int pause_put_stats(struct sk_buff *skb, 118 const struct ethtool_pause_stats *pause_stats) 119 { 120 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD; 121 struct nlattr *nest; 122 123 if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src)) 124 return -EMSGSIZE; 125 126 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS); 127 if (!nest) 128 return -EMSGSIZE; 129 130 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames, 131 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) || 132 ethtool_put_stat(skb, pause_stats->rx_pause_frames, 133 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad)) 134 goto err_cancel; 135 136 nla_nest_end(skb, nest); 137 return 0; 138 139 err_cancel: 140 nla_nest_cancel(skb, nest); 141 return -EMSGSIZE; 142 } 143 144 static int pause_fill_reply(struct sk_buff *skb, 145 const struct ethnl_req_info *req_base, 146 const struct ethnl_reply_data *reply_base) 147 { 148 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 149 const struct ethtool_pauseparam *pauseparam = &data->pauseparam; 150 151 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) || 152 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) || 153 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause)) 154 return -EMSGSIZE; 155 156 if (req_base->flags & ETHTOOL_FLAG_STATS && 157 pause_put_stats(skb, &data->pausestat)) 158 return -EMSGSIZE; 159 160 return 0; 161 } 162 163 /* PAUSE_SET */ 164 165 const struct nla_policy ethnl_pause_set_policy[] = { 166 [ETHTOOL_A_PAUSE_HEADER] = 167 NLA_POLICY_NESTED(ethnl_header_policy), 168 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 }, 169 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 }, 170 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 }, 171 }; 172 173 static int 174 ethnl_set_pause_validate(struct ethnl_req_info *req_info, 175 struct genl_info *info) 176 { 177 const struct ethtool_ops *ops = req_info->dev->ethtool_ops; 178 179 return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP; 180 } 181 182 static int 183 ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info) 184 { 185 struct net_device *dev = req_info->dev; 186 struct ethtool_pauseparam params = {}; 187 struct nlattr **tb = info->attrs; 188 bool mod = false; 189 int ret; 190 191 dev->ethtool_ops->get_pauseparam(dev, ¶ms); 192 193 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod); 194 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod); 195 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod); 196 if (!mod) 197 return 0; 198 199 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms); 200 return ret < 0 ? ret : 1; 201 } 202 203 const struct ethnl_request_ops ethnl_pause_request_ops = { 204 .request_cmd = ETHTOOL_MSG_PAUSE_GET, 205 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY, 206 .hdr_attr = ETHTOOL_A_PAUSE_HEADER, 207 .req_info_size = sizeof(struct pause_req_info), 208 .reply_data_size = sizeof(struct pause_reply_data), 209 210 .parse_request = pause_parse_request, 211 .prepare_data = pause_prepare_data, 212 .reply_size = pause_reply_size, 213 .fill_reply = pause_fill_reply, 214 215 .set_validate = ethnl_set_pause_validate, 216 .set = ethnl_set_pause, 217 .set_ntf_cmd = ETHTOOL_MSG_PAUSE_NTF, 218 }; 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