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- // SPDX-License-Identifier: GPL-2.0-only
- #include "netlink.h"
- #include "common.h"
- struct pause_req_info {
- struct ethnl_req_info base;
- };
- struct pause_reply_data {
- struct ethnl_reply_data base;
- struct ethtool_pauseparam pauseparam;
- struct ethtool_pause_stats pausestat;
- };
- #define PAUSE_REPDATA(__reply_base) \
- container_of(__reply_base, struct pause_reply_data, base)
- const struct nla_policy ethnl_pause_get_policy[] = {
- [ETHTOOL_A_PAUSE_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy_stats),
- };
- static int pause_prepare_data(const struct ethnl_req_info *req_base,
- struct ethnl_reply_data *reply_base,
- struct genl_info *info)
- {
- struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
- struct net_device *dev = reply_base->dev;
- int ret;
- if (!dev->ethtool_ops->get_pauseparam)
- return -EOPNOTSUPP;
- ethtool_stats_init((u64 *)&data->pausestat,
- sizeof(data->pausestat) / 8);
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- return ret;
- dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
- if (req_base->flags & ETHTOOL_FLAG_STATS &&
- dev->ethtool_ops->get_pause_stats)
- dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
- ethnl_ops_complete(dev);
- return 0;
- }
- static int pause_reply_size(const struct ethnl_req_info *req_base,
- const struct ethnl_reply_data *reply_base)
- {
- int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */
- nla_total_size(sizeof(u8)) + /* _PAUSE_RX */
- nla_total_size(sizeof(u8)); /* _PAUSE_TX */
- if (req_base->flags & ETHTOOL_FLAG_STATS)
- n += nla_total_size(0) + /* _PAUSE_STATS */
- nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
- return n;
- }
- static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
- u16 padtype)
- {
- if (val == ETHTOOL_STAT_NOT_SET)
- return 0;
- if (nla_put_u64_64bit(skb, attrtype, val, padtype))
- return -EMSGSIZE;
- return 0;
- }
- static int pause_put_stats(struct sk_buff *skb,
- const struct ethtool_pause_stats *pause_stats)
- {
- const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
- struct nlattr *nest;
- nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
- if (!nest)
- return -EMSGSIZE;
- if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
- ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
- ethtool_put_stat(skb, pause_stats->rx_pause_frames,
- ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
- goto err_cancel;
- nla_nest_end(skb, nest);
- return 0;
- err_cancel:
- nla_nest_cancel(skb, nest);
- return -EMSGSIZE;
- }
- static int pause_fill_reply(struct sk_buff *skb,
- const struct ethnl_req_info *req_base,
- const struct ethnl_reply_data *reply_base)
- {
- const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
- const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
- if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
- nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
- nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
- return -EMSGSIZE;
- if (req_base->flags & ETHTOOL_FLAG_STATS &&
- pause_put_stats(skb, &data->pausestat))
- return -EMSGSIZE;
- return 0;
- }
- const struct ethnl_request_ops ethnl_pause_request_ops = {
- .request_cmd = ETHTOOL_MSG_PAUSE_GET,
- .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
- .hdr_attr = ETHTOOL_A_PAUSE_HEADER,
- .req_info_size = sizeof(struct pause_req_info),
- .reply_data_size = sizeof(struct pause_reply_data),
- .prepare_data = pause_prepare_data,
- .reply_size = pause_reply_size,
- .fill_reply = pause_fill_reply,
- };
- /* PAUSE_SET */
- const struct nla_policy ethnl_pause_set_policy[] = {
- [ETHTOOL_A_PAUSE_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
- [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
- [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
- [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
- };
- int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
- {
- struct ethtool_pauseparam params = {};
- struct ethnl_req_info req_info = {};
- struct nlattr **tb = info->attrs;
- const struct ethtool_ops *ops;
- struct net_device *dev;
- bool mod = false;
- int ret;
- ret = ethnl_parse_header_dev_get(&req_info,
- tb[ETHTOOL_A_PAUSE_HEADER],
- genl_info_net(info), info->extack,
- true);
- if (ret < 0)
- return ret;
- dev = req_info.dev;
- ops = dev->ethtool_ops;
- ret = -EOPNOTSUPP;
- if (!ops->get_pauseparam || !ops->set_pauseparam)
- goto out_dev;
- rtnl_lock();
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- goto out_rtnl;
- ops->get_pauseparam(dev, ¶ms);
- ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
- ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
- ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
- ret = 0;
- if (!mod)
- goto out_ops;
- ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms);
- if (ret < 0)
- goto out_ops;
- ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
- out_ops:
- ethnl_ops_complete(dev);
- out_rtnl:
- rtnl_unlock();
- out_dev:
- ethnl_parse_header_dev_put(&req_info);
- return ret;
- }
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