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-rw-r--r--net/ethtool/pause.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/net/ethtool/pause.c b/net/ethtool/pause.c
new file mode 100644
index 000000000..a8c113d24
--- /dev/null
+++ b/net/ethtool/pause.c
@@ -0,0 +1,186 @@
+// 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, &params);
+
+ ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
+ ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
+ ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
+ ret = 0;
+ if (!mod)
+ goto out_ops;
+
+ ret = dev->ethtool_ops->set_pauseparam(dev, &params);
+ 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;
+}