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 static const struct nla_policy 20 pause_get_policy[ETHTOOL_A_PAUSE_MAX + 1] = { 21 [ETHTOOL_A_PAUSE_UNSPEC] = { .type = NLA_REJECT }, 22 [ETHTOOL_A_PAUSE_HEADER] = { .type = NLA_NESTED }, 23 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_REJECT }, 24 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_REJECT }, 25 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_REJECT }, 26 [ETHTOOL_A_PAUSE_STATS] = { .type = NLA_REJECT }, 27 }; 28 29 static void ethtool_stats_init(u64 *stats, unsigned int n) 30 { 31 while (n--) 32 stats[n] = ETHTOOL_STAT_NOT_SET; 33 } 34 35 static int pause_prepare_data(const struct ethnl_req_info *req_base, 36 struct ethnl_reply_data *reply_base, 37 struct genl_info *info) 38 { 39 struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 40 struct net_device *dev = reply_base->dev; 41 int ret; 42 43 if (!dev->ethtool_ops->get_pauseparam) 44 return -EOPNOTSUPP; 45 46 ret = ethnl_ops_begin(dev); 47 if (ret < 0) 48 return ret; 49 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam); 50 if (req_base->flags & ETHTOOL_FLAG_STATS && 51 dev->ethtool_ops->get_pause_stats) { 52 ethtool_stats_init((u64 *)&data->pausestat, 53 sizeof(data->pausestat) / 8); 54 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat); 55 } 56 ethnl_ops_complete(dev); 57 58 return 0; 59 } 60 61 static int pause_reply_size(const struct ethnl_req_info *req_base, 62 const struct ethnl_reply_data *reply_base) 63 { 64 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */ 65 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */ 66 nla_total_size(sizeof(u8)); /* _PAUSE_TX */ 67 68 if (req_base->flags & ETHTOOL_FLAG_STATS) 69 n += nla_total_size(0) + /* _PAUSE_STATS */ 70 nla_total_size_64bit(sizeof(u64)) * 71 (ETHTOOL_A_PAUSE_STAT_MAX - 2); 72 return n; 73 } 74 75 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype, 76 u16 padtype) 77 { 78 if (val == ETHTOOL_STAT_NOT_SET) 79 return 0; 80 if (nla_put_u64_64bit(skb, attrtype, val, padtype)) 81 return -EMSGSIZE; 82 83 return 0; 84 } 85 86 static int pause_put_stats(struct sk_buff *skb, 87 const struct ethtool_pause_stats *pause_stats) 88 { 89 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD; 90 struct nlattr *nest; 91 92 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS); 93 if (!nest) 94 return -EMSGSIZE; 95 96 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames, 97 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) || 98 ethtool_put_stat(skb, pause_stats->rx_pause_frames, 99 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad)) 100 goto err_cancel; 101 102 nla_nest_end(skb, nest); 103 return 0; 104 105 err_cancel: 106 nla_nest_cancel(skb, nest); 107 return -EMSGSIZE; 108 } 109 110 static int pause_fill_reply(struct sk_buff *skb, 111 const struct ethnl_req_info *req_base, 112 const struct ethnl_reply_data *reply_base) 113 { 114 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base); 115 const struct ethtool_pauseparam *pauseparam = &data->pauseparam; 116 117 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) || 118 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) || 119 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause)) 120 return -EMSGSIZE; 121 122 if (req_base->flags & ETHTOOL_FLAG_STATS && 123 pause_put_stats(skb, &data->pausestat)) 124 return -EMSGSIZE; 125 126 return 0; 127 } 128 129 const struct ethnl_request_ops ethnl_pause_request_ops = { 130 .request_cmd = ETHTOOL_MSG_PAUSE_GET, 131 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY, 132 .hdr_attr = ETHTOOL_A_PAUSE_HEADER, 133 .max_attr = ETHTOOL_A_PAUSE_MAX, 134 .req_info_size = sizeof(struct pause_req_info), 135 .reply_data_size = sizeof(struct pause_reply_data), 136 .request_policy = pause_get_policy, 137 138 .prepare_data = pause_prepare_data, 139 .reply_size = pause_reply_size, 140 .fill_reply = pause_fill_reply, 141 }; 142 143 /* PAUSE_SET */ 144 145 static const struct nla_policy 146 pause_set_policy[ETHTOOL_A_PAUSE_MAX + 1] = { 147 [ETHTOOL_A_PAUSE_UNSPEC] = { .type = NLA_REJECT }, 148 [ETHTOOL_A_PAUSE_HEADER] = { .type = NLA_NESTED }, 149 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 }, 150 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 }, 151 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 }, 152 [ETHTOOL_A_PAUSE_STATS] = { .type = NLA_REJECT }, 153 }; 154 155 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info) 156 { 157 struct nlattr *tb[ETHTOOL_A_PAUSE_MAX + 1]; 158 struct ethtool_pauseparam params = {}; 159 struct ethnl_req_info req_info = {}; 160 const struct ethtool_ops *ops; 161 struct net_device *dev; 162 bool mod = false; 163 int ret; 164 165 ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_PAUSE_MAX, 166 pause_set_policy, info->extack); 167 if (ret < 0) 168 return ret; 169 ret = ethnl_parse_header_dev_get(&req_info, 170 tb[ETHTOOL_A_PAUSE_HEADER], 171 genl_info_net(info), info->extack, 172 true); 173 if (ret < 0) 174 return ret; 175 dev = req_info.dev; 176 ops = dev->ethtool_ops; 177 ret = -EOPNOTSUPP; 178 if (!ops->get_pauseparam || !ops->set_pauseparam) 179 goto out_dev; 180 181 rtnl_lock(); 182 ret = ethnl_ops_begin(dev); 183 if (ret < 0) 184 goto out_rtnl; 185 ops->get_pauseparam(dev, ¶ms); 186 187 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod); 188 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod); 189 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod); 190 ret = 0; 191 if (!mod) 192 goto out_ops; 193 194 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms); 195 if (ret < 0) 196 goto out_ops; 197 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL); 198 199 out_ops: 200 ethnl_ops_complete(dev); 201 out_rtnl: 202 rtnl_unlock(); 203 out_dev: 204 dev_put(dev); 205 return ret; 206 } 207