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ethtool: set device channel counts with CHANNELS_SET request

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Implement CHANNELS_SET netlink request to set channel counts of a network
device. These are traditionally set with ETHTOOL_SCHANNELS ioctl request.

Like the ioctl implementation, the generic ethtool code checks if supplied
values do not exceed driver defined limits; if they do, first offending
attribute is reported using extack. Checks preventing removing channels
used for RX indirection table or zerocopy AF_XDP socket are also
implemented.

Move ethtool_get_max_rxfh_channel() helper into common.c so that it can be
used by both ioctl and netlink code.

v2:
  - fix netdev reference leak in error path (found by Jakub Kicinsky)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek 2020-03-12 21:08:43 +01:00 committed by David S. Miller
parent 0c84979c95
commit e19c591eaf
8 changed files with 177 additions and 32 deletions
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23
Documentation/networking/ethtool-netlink.rst
View File

@ -196,6 +196,7 @@ Userspace to kernel:
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
``ETHTOOL_MSG_RINGS_SET`` set ring sizes
``ETHTOOL_MSG_CHANNELS_GET`` get channel counts
``ETHTOOL_MSG_CHANNELS_SET`` set channel counts
===================================== ================================
Kernel to userspace:
@ -723,6 +724,26 @@ Kernel response contents:
===================================== ====== ==========================
CHANNELS_SET
============
Sets channel counts like ``ETHTOOL_SCHANNELS`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_CHANNELS_HEADER`` nested request header
``ETHTOOL_A_CHANNELS_RX_COUNT`` u32 receive channel count
``ETHTOOL_A_CHANNELS_TX_COUNT`` u32 transmit channel count
``ETHTOOL_A_CHANNELS_OTHER_COUNT`` u32 other channel count
``ETHTOOL_A_CHANNELS_COMBINED_COUNT`` u32 combined channel count
===================================== ====== ==========================
Kernel checks that requested channel counts do not exceed limits reported by
driver. Driver may impose additional constraints and may not suspport all
attributes.
Request translation
===================
@ -794,7 +815,7 @@ have their netlink replacement yet.
``ETHTOOL_GFEATURES`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SFEATURES`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GCHANNELS`` ``ETHTOOL_MSG_CHANNELS_GET``
``ETHTOOL_SCHANNELS`` n/a
``ETHTOOL_SCHANNELS`` ``ETHTOOL_MSG_CHANNELS_SET``
``ETHTOOL_SET_DUMP`` n/a
``ETHTOOL_GET_DUMP_FLAG`` n/a
``ETHTOOL_GET_DUMP_DATA`` n/a

1
include/uapi/linux/ethtool_netlink.h
View File

@ -31,6 +31,7 @@ enum {
ETHTOOL_MSG_RINGS_GET,
ETHTOOL_MSG_RINGS_SET,
ETHTOOL_MSG_CHANNELS_GET,
ETHTOOL_MSG_CHANNELS_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,

116
net/ethtool/channels.c
View File

@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <net/xdp_sock.h>
#include "netlink.h"
#include "common.h"
@ -106,3 +108,117 @@ const struct ethnl_request_ops ethnl_channels_request_ops = {
.reply_size = channels_reply_size,
.fill_reply = channels_fill_reply,
};
/* CHANNELS_SET */
static const struct nla_policy
channels_set_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
[ETHTOOL_A_CHANNELS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_CHANNELS_RX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_TX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_OTHER_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_COMBINED_MAX] = { .type = NLA_REJECT },
[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 },
};
int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb[ETHTOOL_A_CHANNELS_MAX + 1];
unsigned int from_channel, old_total, i;
struct ethtool_channels channels = {};
struct ethnl_req_info req_info = {};
const struct nlattr *err_attr;
const struct ethtool_ops *ops;
struct net_device *dev;
u32 max_rx_in_use = 0;
bool mod = false;
int ret;
ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
ETHTOOL_A_CHANNELS_MAX, channels_set_policy,
info->extack);
if (ret < 0)
return ret;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_CHANNELS_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_channels || !ops->set_channels)
goto out_dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
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);
ret = 0;
if (!mod)
goto out_ops;
/* ensure new channel counts are within limits */
if (channels.rx_count > channels.max_rx)
err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT];
else if (channels.tx_count > channels.max_tx)
err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT];
else if (channels.other_count > channels.max_other)
err_attr = tb[ETHTOOL_A_CHANNELS_OTHER_COUNT];
else if (channels.combined_count > channels.max_combined)
err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT];
else
err_attr = NULL;
if (err_attr) {
ret = -EINVAL;
NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
"requested channel count exceeeds maximum");
goto out_ops;
}
/* ensure the new Rx count fits within the configured Rx flow
* indirection table settings
*/
if (netif_is_rxfh_configured(dev) &&
!ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
(channels.combined_count + channels.rx_count) <= max_rx_in_use) {
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table 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 (xdp_get_umem_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);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
dev_put(dev);
return ret;
}

31
net/ethtool/common.c
View File

@ -258,3 +258,34 @@ int __ethtool_get_link(struct net_device *dev)
return netif_running(dev) && dev->ethtool_ops->get_link(dev);
}
int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
{
u32 dev_size, current_max = 0;
u32 *indir;
int ret;
if (!dev->ethtool_ops->get_rxfh_indir_size ||
!dev->ethtool_ops->get_rxfh)
return -EOPNOTSUPP;
dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
if (dev_size == 0)
return -EOPNOTSUPP;
indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
if (!indir)
return -ENOMEM;
ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
if (ret)
goto out;
while (dev_size--)
current_max = max(current_max, indir[dev_size]);
*max = current_max;
out:
kfree(indir);
return ret;
}

1
net/ethtool/common.h
View File

@ -29,5 +29,6 @@ int __ethtool_get_link(struct net_device *dev);
bool convert_legacy_settings_to_link_ksettings(
struct ethtool_link_ksettings *link_ksettings,
const struct ethtool_cmd *legacy_settings);
int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max);
#endif /* _ETHTOOL_COMMON_H */

31
net/ethtool/ioctl.c
View File

@ -929,37 +929,6 @@ void netdev_rss_key_fill(void *buffer, size_t len)
}
EXPORT_SYMBOL(netdev_rss_key_fill);
static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
{
u32 dev_size, current_max = 0;
u32 *indir;
int ret;
if (!dev->ethtool_ops->get_rxfh_indir_size ||
!dev->ethtool_ops->get_rxfh)
return -EOPNOTSUPP;
dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
if (dev_size == 0)
return -EOPNOTSUPP;
indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
if (!indir)
return -ENOMEM;
ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
if (ret)
goto out;
while (dev_size--)
current_max = max(current_max, indir[dev_size]);
*max = current_max;
out:
kfree(indir);
return ret;
}
static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
void __user *useraddr)
{

5
net/ethtool/netlink.c
View File

@ -771,6 +771,11 @@ static const struct genl_ops ethtool_genl_ops[] = {
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
{
.cmd = ETHTOOL_MSG_CHANNELS_SET,
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_channels,
},
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {

1
net/ethtool/netlink.h
View File

@ -349,5 +349,6 @@ int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info);
#endif /* _NET_ETHTOOL_NETLINK_H */