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 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 netlink_ext_ack *extack = info->extack; 60 struct net_device *dev = reply_base->dev; 61 int ret; 62 63 if (!dev->ethtool_ops->get_pauseparam) 64 return -EOPNOTSUPP; 65 66 ethtool_stats_init((u64 *)&data->pausestat, 67 sizeof(data->pausestat) / 8); 68 data->pausestat.src = src; 69 70 ret = ethnl_ops_begin(dev); 71 if (ret < 0) 72 return ret; 73 74 if ((src == ETHTOOL_MAC_STATS_SRC_EMAC || 75 src == ETHTOOL_MAC_STATS_SRC_PMAC) && 76 !__ethtool_dev_mm_supported(dev)) { 77 NL_SET_ERR_MSG_MOD(extack, 78 "Device does not support MAC merge layer"); 79 ethnl_ops_complete(dev); 80 return -EOPNOTSUPP; 81 } 82 83 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam); 84 if (req_base->flags & ETHTOOL_FLAG_STATS && 85 dev->ethtool_ops->get_pause_stats) 86 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat); 87 88 ethnl_ops_complete(dev); 89 90 return 0; 91 } 92 93 static int pause_reply_size(const struct ethnl_req_info *req_base, 94 const struct ethnl_reply_data *reply_base) 95 { 96 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */ 97 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */ 98 nla_total_size(sizeof(u8)); /* _PAUSE_TX */ 99 100 if (req_base->flags & ETHTOOL_FLAG_STATS) 101 n += nla_total_size(0) + /* _PAUSE_STATS */ 102 nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */ 103 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT; 104 return n; 105 } 106 107 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype, 108 u16 padtype) 109 { 110 if (val == ETHTOOL_STAT_NOT_SET) 111 return 0; 112 if (nla_put_u64_64bit(skb, attrtype, val, padtype)) 113 return -EMSGSIZE; 114 115 return 0; 116 } 117 118 static int pause_put_stats(struct sk_buff *skb, 119 const struct ethtool_pause_stats *pause_stats) 120 { 121 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD; 122 struct nlattr *nest; 123 124 if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src)) 125 return -EMSGSIZE; 126 127 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS); 128 if (!nest) 129 return -EMSGSIZE; 130 131 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames, 132 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) || 133 ethtool_put_stat(skb, pause_stats->rx_pause_frames, 134 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad)) 135 goto err_cancel; 136 137 nla_nest_end(skb, nest); 138 return 0; 139 140 err_cancel: 141 nla_nest_cancel(skb, nest); 142 return -EMSGSIZE; 143 } 144 145 static int pause_fill_reply(struct sk_buff *skb, 146 const struct ethnl_req_info *req_base, 147 const struct ethnl_reply_data *reply_base) 148 { 149 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 150 const struct ethtool_pauseparam *pauseparam = &data->pauseparam; 151 152 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) || 153 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) || 154 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause)) 155 return -EMSGSIZE; 156 157 if (req_base->flags & ETHTOOL_FLAG_STATS && 158 pause_put_stats(skb, &data->pausestat)) 159 return -EMSGSIZE; 160 161 return 0; 162 } 163 164 const struct ethnl_request_ops ethnl_pause_request_ops = { 165 .request_cmd = ETHTOOL_MSG_PAUSE_GET, 166 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY, 167 .hdr_attr = ETHTOOL_A_PAUSE_HEADER, 168 .req_info_size = sizeof(struct pause_req_info), 169 .reply_data_size = sizeof(struct pause_reply_data), 170 171 .parse_request = pause_parse_request, 172 .prepare_data = pause_prepare_data, 173 .reply_size = pause_reply_size, 174 .fill_reply = pause_fill_reply, 175 }; 176 177 /* PAUSE_SET */ 178 179 const struct nla_policy ethnl_pause_set_policy[] = { 180 [ETHTOOL_A_PAUSE_HEADER] = 181 NLA_POLICY_NESTED(ethnl_header_policy), 182 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 }, 183 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 }, 184 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 }, 185 }; 186 187 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info) 188 { 189 struct ethtool_pauseparam params = {}; 190 struct ethnl_req_info req_info = {}; 191 struct nlattr **tb = info->attrs; 192 const struct ethtool_ops *ops; 193 struct net_device *dev; 194 bool mod = false; 195 int ret; 196 197 ret = ethnl_parse_header_dev_get(&req_info, 198 tb[ETHTOOL_A_PAUSE_HEADER], 199 genl_info_net(info), info->extack, 200 true); 201 if (ret < 0) 202 return ret; 203 dev = req_info.dev; 204 ops = dev->ethtool_ops; 205 ret = -EOPNOTSUPP; 206 if (!ops->get_pauseparam || !ops->set_pauseparam) 207 goto out_dev; 208 209 rtnl_lock(); 210 ret = ethnl_ops_begin(dev); 211 if (ret < 0) 212 goto out_rtnl; 213 ops->get_pauseparam(dev, ¶ms); 214 215 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod); 216 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod); 217 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod); 218 ret = 0; 219 if (!mod) 220 goto out_ops; 221 222 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms); 223 if (ret < 0) 224 goto out_ops; 225 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL); 226 227 out_ops: 228 ethnl_ops_complete(dev); 229 out_rtnl: 230 rtnl_unlock(); 231 out_dev: 232 ethnl_parse_header_dev_put(&req_info); 233 return ret; 234 } 235