rings.c
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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
struct rings_req_info {
struct ethnl_req_info base;
};
struct rings_reply_data {
struct ethnl_reply_data base;
struct ethtool_ringparam ringparam;
};
#define RINGS_REPDATA(__reply_base) \
container_of(__reply_base, struct rings_reply_data, base)
const struct nla_policy ethnl_rings_get_policy[] = {
[ETHTOOL_A_RINGS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static int rings_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct rings_reply_data *data = RINGS_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
if (!dev->ethtool_ops->get_ringparam)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
dev->ethtool_ops->get_ringparam(dev, &data->ringparam);
ethnl_ops_complete(dev);
return 0;
}
static int rings_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u32)) + /* _RINGS_RX_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_TX_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO */
nla_total_size(sizeof(u32)); /* _RINGS_TX */
}
static int rings_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
const struct ethtool_ringparam *ringparam = &data->ringparam;
if ((ringparam->rx_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
ringparam->rx_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
ringparam->rx_pending))) ||
(ringparam->rx_mini_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
ringparam->rx_mini_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
ringparam->rx_mini_pending))) ||
(ringparam->rx_jumbo_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
ringparam->rx_jumbo_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
ringparam->rx_jumbo_pending))) ||
(ringparam->tx_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
ringparam->tx_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
ringparam->tx_pending))))
return -EMSGSIZE;
return 0;
}
const struct ethnl_request_ops ethnl_rings_request_ops = {
.request_cmd = ETHTOOL_MSG_RINGS_GET,
.reply_cmd = ETHTOOL_MSG_RINGS_GET_REPLY,
.hdr_attr = ETHTOOL_A_RINGS_HEADER,
.req_info_size = sizeof(struct rings_req_info),
.reply_data_size = sizeof(struct rings_reply_data),
.prepare_data = rings_prepare_data,
.reply_size = rings_reply_size,
.fill_reply = rings_fill_reply,
};
/* RINGS_SET */
const struct nla_policy ethnl_rings_set_policy[] = {
[ETHTOOL_A_RINGS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
};
int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
{
struct ethtool_ringparam ringparam = {};
struct ethnl_req_info req_info = {};
struct nlattr **tb = info->attrs;
const struct nlattr *err_attr;
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_RINGS_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_ringparam || !ops->set_ringparam)
goto out_dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ops->get_ringparam(dev, &ringparam);
ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
ethnl_update_u32(&ringparam.rx_mini_pending,
tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
ethnl_update_u32(&ringparam.rx_jumbo_pending,
tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
ret = 0;
if (!mod)
goto out_ops;
/* ensure new ring parameters are within limits */
if (ringparam.rx_pending > ringparam.rx_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX];
else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
else if (ringparam.tx_pending > ringparam.tx_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_TX];
else
err_attr = NULL;
if (err_attr) {
ret = -EINVAL;
NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
"requested ring size exceeds maximum");
goto out_ops;
}
ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
if (ret < 0)
goto out_ops;
ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
dev_put(dev);
return ret;
}