// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
#include "bitset.h"
/* LINKMODES_GET */
struct linkmodes_req_info {
struct ethnl_req_info base;
};
struct linkmodes_reply_data {
struct ethnl_reply_data base;
struct ethtool_link_ksettings ksettings;
struct ethtool_link_settings *lsettings;
bool peer_empty;
};
#define LINKMODES_REPDATA(__reply_base) \
container_of(__reply_base, struct linkmodes_reply_data, base)
const struct nla_policy ethnl_linkmodes_get_policy[] = {
[ETHTOOL_A_LINKMODES_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
const struct genl_info *info)
{
struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
data->lsettings = &data->ksettings.base;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
if (ret < 0) {
GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
goto out;
}
if (!dev->ethtool_ops->cap_link_lanes_supported)
data->ksettings.lanes = 0;
data->peer_empty =
bitmap_empty(data->ksettings.link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS);
out:
ethnl_ops_complete(dev);
return ret;
}
static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
const struct ethtool_link_ksettings *ksettings = &data->ksettings;
const struct ethtool_link_settings *lsettings = &ksettings->base;
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
int len, ret;
len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
+ nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
+ nla_total_size(sizeof(u32)) /* LINKMODES_LANES */
+ nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
+ nla_total_size(sizeof(u8)) /* LINKMODES_RATE_MATCHING */
+ 0;
ret = ethnl_bitset_size(ksettings->link_modes.advertising,
ksettings->link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS,
link_mode_names, compact);
if (ret < 0)
return ret;
len += ret;
if (!data->peer_empty) {
ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
link_mode_names, compact);
if (ret < 0)
return ret;
len += ret;
}
if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
len += nla_total_size(sizeof(u8));
if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
len += nla_total_size(sizeof(u8));
return len;
}
static int linkmodes_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
const struct ethtool_link_ksettings *ksettings = &data->ksettings;
const struct ethtool_link_settings *lsettings = &ksettings->base;
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
int ret;
if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
return -EMSGSIZE;
ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
ksettings->link_modes.advertising,
ksettings->link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
compact);
if (ret < 0)
return -EMSGSIZE;
if (!data->peer_empty) {
ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
ksettings->link_modes.lp_advertising,
NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
link_mode_names, compact);
if (ret < 0)
return -EMSGSIZE;
}
if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
return -EMSGSIZE;
if (ksettings->lanes &&
nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes))
return -EMSGSIZE;
if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
lsettings->master_slave_cfg))
return -EMSGSIZE;
if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
lsettings->master_slave_state))
return -EMSGSIZE;
if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_RATE_MATCHING,
lsettings->rate_matching))
return -EMSGSIZE;
return 0;
}
/* LINKMODES_SET */
const struct nla_policy ethnl_linkmodes_set_policy[] = {
[ETHTOOL_A_LINKMODES_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_LINKMODES_AUTONEG] = { .type = NLA_U8 },
[ETHTOOL_A_LINKMODES_OURS] = { .type = NLA_NESTED },
[ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 },
[ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 },
[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 },
[ETHTOOL_A_LINKMODES_LANES] = NLA_POLICY_RANGE(NLA_U32, 1, 8),
};
/* Set advertised link modes to all supported modes matching requested speed,
* lanes and duplex values. Called when autonegotiation is on, speed, lanes or
* duplex is requested but no link mode change. This is done in userspace with
* ioctl() interface, move it into kernel for netlink.
* Returns true if advertised modes bitmap was modified.
*/
static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
bool req_speed, bool req_lanes, bool req_duplex)
{
unsigned long *advertising = ksettings->link_modes.advertising;
unsigned long *supported = ksettings->link_modes.supported;
DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
unsigned int i;
bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
const struct link_mode_info *info = &link_mode_params[i];
if (info->speed == SPEED_UNKNOWN)
continue;
if (test_bit(i, supported) &&
(!req_speed || info->speed == ksettings->base.speed) &&
(!req_lanes || info->lanes == ksettings->lanes) &&
(!req_duplex || info->duplex == ksettings->base.duplex))
set_bit(i, advertising);
else
clear_bit(i, advertising);
}
return !bitmap_equal(old_adv, advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS);
}
static bool ethnl_validate_master_slave_cfg(u8 cfg)
{
switch (cfg) {
case MASTER_SLAVE_CFG_MASTER_PREFERRED:
case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
case MASTER_SLAVE_CFG_MASTER_FORCE:
case MASTER_SLAVE_CFG_SLAVE_FORCE:
return true;
}
return false;
}
static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb)
{
const struct nlattr *master_slave_cfg, *lanes_cfg;
master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
if (master_slave_cfg &&
!ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
"master/slave value is invalid");
return -EOPNOTSUPP;
}
lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
"lanes value is invalid");
return -EINVAL;
}
return 0;
}
static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
struct ethtool_link_ksettings *ksettings,
bool *mod, const struct net_device *dev)
{
struct ethtool_link_settings *lsettings = &ksettings->base;
bool req_speed, req_lanes, req_duplex;
const struct nlattr *master_slave_cfg, *lanes_cfg;
int ret;
master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
if (master_slave_cfg) {
if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
"master/slave configuration not supported by device");
return -EOPNOTSUPP;
}
}
*mod = false;
req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
mod);
lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
if (lanes_cfg) {
/* If autoneg is off and lanes parameter is not supported by the
* driver, return an error.
*/
if (!lsettings->autoneg &&
!dev->ethtool_ops->cap_link_lanes_supported) {
NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
"lanes configuration not supported by device");
return -EOPNOTSUPP;
}
} else if (!lsettings->autoneg && ksettings->lanes) {
/* If autoneg is off and lanes parameter is not passed from user but
* it was defined previously then set the lanes parameter to 0.
*/
ksettings->lanes = 0;
*mod = true;
}
ret = ethnl_update_bitset(ksettings->link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS,
tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
info->extack, mod);
if (ret < 0)
return ret;
ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
mod);
ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
mod);
ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
(req_speed || req_lanes || req_duplex) &&
ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
*mod = true;
return 0;
}
static int
ethnl_set_linkmodes_validate(struct ethnl_req_info *req_info,
struct genl_info *info)
{
const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
int ret;
ret = ethnl_check_linkmodes(info, info->attrs);
if (ret < 0)
return ret;
if (!ops->get_link_ksettings || !ops->set_link_ksettings)
return -EOPNOTSUPP;
return 1;
}
static int
ethnl_set_linkmodes(struct ethnl_req_info *req_info, struct genl_info *info)
{
struct ethtool_link_ksettings ksettings = {};
struct net_device *dev = req_info->dev;
struct nlattr **tb = info->attrs;
bool mod = false;
int ret;
ret = __ethtool_get_link_ksettings(dev, &ksettings);
if (ret < 0) {
GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
return ret;
}
ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
if (ret < 0)
return ret;
if (!mod)
return 0;
ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
if (ret < 0) {
GENL_SET_ERR_MSG(info, "link settings update failed");
return ret;
}
return 1;
}
const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
.request_cmd = ETHTOOL_MSG_LINKMODES_GET,
.reply_cmd = ETHTOOL_MSG_LINKMODES_GET_REPLY,
.hdr_attr = ETHTOOL_A_LINKMODES_HEADER,
.req_info_size = sizeof(struct linkmodes_req_info),
.reply_data_size = sizeof(struct linkmodes_reply_data),
.prepare_data = linkmodes_prepare_data,
.reply_size = linkmodes_reply_size,
.fill_reply = linkmodes_fill_reply,
.set_validate = ethnl_set_linkmodes_validate,
.set = ethnl_set_linkmodes,
.set_ntf_cmd = ETHTOOL_MSG_LINKMODES_NTF,
};
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