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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)
static const struct nla_policy
pause_get_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
[ETHTOOL_A_PAUSE_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_PAUSE_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_REJECT },
[ETHTOOL_A_PAUSE_RX] = { .type = NLA_REJECT },
[ETHTOOL_A_PAUSE_TX] = { .type = NLA_REJECT },
[ETHTOOL_A_PAUSE_STATS] = { .type = NLA_REJECT },
};
static void ethtool_stats_init(u64 *stats, unsigned int n)
{
while (n--)
stats[n] = ETHTOOL_STAT_NOT_SET;
}
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;
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) {
ethtool_stats_init((u64 *)&data->pausestat,
sizeof(data->pausestat) / 8);
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_A_PAUSE_STAT_MAX - 2);
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,
.max_attr = ETHTOOL_A_PAUSE_MAX,
.req_info_size = sizeof(struct pause_req_info),
.reply_data_size = sizeof(struct pause_reply_data),
.request_policy = pause_get_policy,
.prepare_data = pause_prepare_data,
.reply_size = pause_reply_size,
.fill_reply = pause_fill_reply,
};
/* PAUSE_SET */
static const struct nla_policy
pause_set_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
[ETHTOOL_A_PAUSE_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_PAUSE_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_STATS] = { .type = NLA_REJECT },
};
int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb[ETHTOOL_A_PAUSE_MAX + 1];
struct ethtool_pauseparam params = {};
struct ethnl_req_info req_info = {};
const struct ethtool_ops *ops;
struct net_device *dev;
bool mod = false;
int ret;
ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_PAUSE_MAX,
pause_set_policy, info->extack);
if (ret < 0)
return 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:
dev_put(dev);
return ret;
}
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