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// SPDX-License-Identifier: GPL-2.0-only
#include <net/xdp_sock_drv.h>
#include "netlink.h"
#include "common.h"
struct channels_req_info {
struct ethnl_req_info base;
};
struct channels_reply_data {
struct ethnl_reply_data base;
struct ethtool_channels channels;
};
#define CHANNELS_REPDATA(__reply_base) \
container_of(__reply_base, struct channels_reply_data, base)
const struct nla_policy ethnl_channels_get_policy[] = {
[ETHTOOL_A_CHANNELS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static int channels_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
const struct genl_info *info)
{
struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
if (!dev->ethtool_ops->get_channels)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
dev->ethtool_ops->get_channels(dev, &data->channels);
ethnl_ops_complete(dev);
return 0;
}
static int channels_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */
nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */
}
static int channels_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
const struct ethtool_channels *channels = &data->channels;
if ((channels->max_rx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX,
channels->max_rx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT,
channels->rx_count))) ||
(channels->max_tx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX,
channels->max_tx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT,
channels->tx_count))) ||
(channels->max_other &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX,
channels->max_other) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT,
channels->other_count))) ||
(channels->max_combined &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX,
channels->max_combined) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT,
channels->combined_count))))
return -EMSGSIZE;
return 0;
}
/* CHANNELS_SET */
const struct nla_policy ethnl_channels_set_policy[] = {
[ETHTOOL_A_CHANNELS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 },
};
static int
ethnl_set_channels_validate(struct ethnl_req_info *req_info,
struct genl_info *info)
{
const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
return ops->get_channels && ops->set_channels ? 1 : -EOPNOTSUPP;
}
static int
ethnl_set_channels(struct ethnl_req_info *req_info, struct genl_info *info)
{
unsigned int from_channel, old_total, i;
bool mod = false, mod_combined = false;
struct net_device *dev = req_info->dev;
struct ethtool_channels channels = {};
struct nlattr **tb = info->attrs;
u32 err_attr, max_rxfh_in_use;
u64 max_rxnfc_in_use;
int ret;
dev->ethtool_ops->get_channels(dev, &channels);
old_total = channels.combined_count +
max(channels.rx_count, channels.tx_count);
ethnl_update_u32(&channels.rx_count, tb[ETHTOOL_A_CHANNELS_RX_COUNT],
&mod);
ethnl_update_u32(&channels.tx_count, tb[ETHTOOL_A_CHANNELS_TX_COUNT],
&mod);
ethnl_update_u32(&channels.other_count,
tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], &mod);
ethnl_update_u32(&channels.combined_count,
tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod_combined);
mod |= mod_combined;
if (!mod)
return 0;
/* ensure new channel counts are within limits */
if (channels.rx_count > channels.max_rx)
err_attr = ETHTOOL_A_CHANNELS_RX_COUNT;
else if (channels.tx_count > channels.max_tx)
err_attr = ETHTOOL_A_CHANNELS_TX_COUNT;
else if (channels.other_count > channels.max_other)
err_attr = ETHTOOL_A_CHANNELS_OTHER_COUNT;
else if (channels.combined_count > channels.max_combined)
err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT;
else
err_attr = 0;
if (err_attr) {
NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr],
"requested channel count exceeds maximum");
return -EINVAL;
}
/* ensure there is at least one RX and one TX channel */
if (!channels.combined_count && !channels.rx_count)
err_attr = ETHTOOL_A_CHANNELS_RX_COUNT;
else if (!channels.combined_count && !channels.tx_count)
err_attr = ETHTOOL_A_CHANNELS_TX_COUNT;
else
err_attr = 0;
if (err_attr) {
if (mod_combined)
err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT;
NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr],
"requested channel counts would result in no RX or TX channel being configured");
return -EINVAL;
}
/* ensure the new Rx count fits within the configured Rx flow
* indirection table/rxnfc settings
*/
if (ethtool_get_max_rxnfc_channel(dev, &max_rxnfc_in_use))
max_rxnfc_in_use = 0;
max_rxfh_in_use = ethtool_get_max_rxfh_channel(dev);
if (channels.combined_count + channels.rx_count <= max_rxfh_in_use) {
GENL_SET_ERR_MSG_FMT(info, "requested channel counts are too low for existing indirection table (%d)", max_rxfh_in_use);
return -EINVAL;
}
if (channels.combined_count + channels.rx_count <= max_rxnfc_in_use) {
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing ntuple filter settings");
return -EINVAL;
}
/* Disabling channels, query zero-copy AF_XDP sockets */
from_channel = channels.combined_count +
min(channels.rx_count, channels.tx_count);
for (i = from_channel; i < old_total; i++)
if (xsk_get_pool_from_qid(dev, i)) {
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets");
return -EINVAL;
}
ret = dev->ethtool_ops->set_channels(dev, &channels);
return ret < 0 ? ret : 1;
}
const struct ethnl_request_ops ethnl_channels_request_ops = {
.request_cmd = ETHTOOL_MSG_CHANNELS_GET,
.reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY,
.hdr_attr = ETHTOOL_A_CHANNELS_HEADER,
.req_info_size = sizeof(struct channels_req_info),
.reply_data_size = sizeof(struct channels_reply_data),
.prepare_data = channels_prepare_data,
.reply_size = channels_reply_size,
.fill_reply = channels_fill_reply,
.set_validate = ethnl_set_channels_validate,
.set = ethnl_set_channels,
.set_ntf_cmd = ETHTOOL_MSG_CHANNELS_NTF,
};
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