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 }; 9 10 struct pause_reply_data { 11 struct ethnl_reply_data base; 12 struct ethtool_pauseparam pauseparam; 13 struct ethtool_pause_stats pausestat; 14 }; 15 16 #define PAUSE_REPDATA(__reply_base) \ 17 container_of(__reply_base, struct pause_reply_data, base) 18 19 const struct nla_policy ethnl_pause_get_policy[] = { 20 [ETHTOOL_A_PAUSE_HEADER] = 21 NLA_POLICY_NESTED(ethnl_header_policy_stats), 22 }; 23 24 static int pause_prepare_data(const struct ethnl_req_info *req_base, 25 struct ethnl_reply_data *reply_base, 26 struct genl_info *info) 27 { 28 struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 29 struct net_device *dev = reply_base->dev; 30 int ret; 31 32 if (!dev->ethtool_ops->get_pauseparam) 33 return -EOPNOTSUPP; 34 35 ethtool_stats_init((u64 *)&data->pausestat, 36 sizeof(data->pausestat) / 8); 37 38 ret = ethnl_ops_begin(dev); 39 if (ret < 0) 40 return ret; 41 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam); 42 if (req_base->flags & ETHTOOL_FLAG_STATS && 43 dev->ethtool_ops->get_pause_stats) 44 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat); 45 ethnl_ops_complete(dev); 46 47 return 0; 48 } 49 50 static int pause_reply_size(const struct ethnl_req_info *req_base, 51 const struct ethnl_reply_data *reply_base) 52 { 53 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */ 54 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */ 55 nla_total_size(sizeof(u8)); /* _PAUSE_TX */ 56 57 if (req_base->flags & ETHTOOL_FLAG_STATS) 58 n += nla_total_size(0) + /* _PAUSE_STATS */ 59 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT; 60 return n; 61 } 62 63 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype, 64 u16 padtype) 65 { 66 if (val == ETHTOOL_STAT_NOT_SET) 67 return 0; 68 if (nla_put_u64_64bit(skb, attrtype, val, padtype)) 69 return -EMSGSIZE; 70 71 return 0; 72 } 73 74 static int pause_put_stats(struct sk_buff *skb, 75 const struct ethtool_pause_stats *pause_stats) 76 { 77 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD; 78 struct nlattr *nest; 79 80 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS); 81 if (!nest) 82 return -EMSGSIZE; 83 84 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames, 85 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) || 86 ethtool_put_stat(skb, pause_stats->rx_pause_frames, 87 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad)) 88 goto err_cancel; 89 90 nla_nest_end(skb, nest); 91 return 0; 92 93 err_cancel: 94 nla_nest_cancel(skb, nest); 95 return -EMSGSIZE; 96 } 97 98 static int pause_fill_reply(struct sk_buff *skb, 99 const struct ethnl_req_info *req_base, 100 const struct ethnl_reply_data *reply_base) 101 { 102 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 103 const struct ethtool_pauseparam *pauseparam = &data->pauseparam; 104 105 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) || 106 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) || 107 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause)) 108 return -EMSGSIZE; 109 110 if (req_base->flags & ETHTOOL_FLAG_STATS && 111 pause_put_stats(skb, &data->pausestat)) 112 return -EMSGSIZE; 113 114 return 0; 115 } 116 117 const struct ethnl_request_ops ethnl_pause_request_ops = { 118 .request_cmd = ETHTOOL_MSG_PAUSE_GET, 119 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY, 120 .hdr_attr = ETHTOOL_A_PAUSE_HEADER, 121 .req_info_size = sizeof(struct pause_req_info), 122 .reply_data_size = sizeof(struct pause_reply_data), 123 124 .prepare_data = pause_prepare_data, 125 .reply_size = pause_reply_size, 126 .fill_reply = pause_fill_reply, 127 }; 128 129 /* PAUSE_SET */ 130 131 const struct nla_policy ethnl_pause_set_policy[] = { 132 [ETHTOOL_A_PAUSE_HEADER] = 133 NLA_POLICY_NESTED(ethnl_header_policy), 134 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 }, 135 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 }, 136 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 }, 137 }; 138 139 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info) 140 { 141 struct ethtool_pauseparam params = {}; 142 struct ethnl_req_info req_info = {}; 143 struct nlattr **tb = info->attrs; 144 const struct ethtool_ops *ops; 145 struct net_device *dev; 146 bool mod = false; 147 int ret; 148 149 ret = ethnl_parse_header_dev_get(&req_info, 150 tb[ETHTOOL_A_PAUSE_HEADER], 151 genl_info_net(info), info->extack, 152 true); 153 if (ret < 0) 154 return ret; 155 dev = req_info.dev; 156 ops = dev->ethtool_ops; 157 ret = -EOPNOTSUPP; 158 if (!ops->get_pauseparam || !ops->set_pauseparam) 159 goto out_dev; 160 161 rtnl_lock(); 162 ret = ethnl_ops_begin(dev); 163 if (ret < 0) 164 goto out_rtnl; 165 ops->get_pauseparam(dev, ¶ms); 166 167 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod); 168 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod); 169 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod); 170 ret = 0; 171 if (!mod) 172 goto out_ops; 173 174 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms); 175 if (ret < 0) 176 goto out_ops; 177 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL); 178 179 out_ops: 180 ethnl_ops_complete(dev); 181 out_rtnl: 182 rtnl_unlock(); 183 out_dev: 184 ethnl_parse_header_dev_put(&req_info); 185 return ret; 186 } 187