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ethtool: set device ring sizes with RINGS_SET request

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Implement RINGS_SET netlink request to set ring sizes of a network device.
These are traditionally set with ETHTOOL_SRINGPARAM 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.

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 21:08:28 +01:00 committed by David S. Miller
parent e4a1717b67
commit 2fc2929e80
5 changed files with 118 additions and 1 deletions
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23
Documentation/networking/ethtool-netlink.rst
View file

@ -194,6 +194,7 @@ Userspace to kernel:
``ETHTOOL_MSG_PRIVFLAGS_GET`` get private flags
``ETHTOOL_MSG_PRIVFLAGS_SET`` set private flags
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
``ETHTOOL_MSG_RINGS_SET`` set ring sizes
===================================== ================================
Kernel to userspace:
@ -673,6 +674,26 @@ Kernel response contents:
==================================== ====== ==========================
RINGS_SET
=========
Sets ring sizes like ``ETHTOOL_SRINGPARAM`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_RINGS_HEADER`` nested reply header
``ETHTOOL_A_RINGS_RX`` u32 size of RX ring
``ETHTOOL_A_RINGS_RX_MINI`` u32 size of RX mini ring
``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
==================================== ====== ==========================
Kernel checks that requested ring sizes do not exceed limits reported by
driver. Driver may impose additional constraints and may not suspport all
attributes.
Request translation
===================
@ -700,7 +721,7 @@ have their netlink replacement yet.
``ETHTOOL_GCOALESCE`` n/a
``ETHTOOL_SCOALESCE`` n/a
``ETHTOOL_GRINGPARAM`` ``ETHTOOL_MSG_RINGS_GET``
``ETHTOOL_SRINGPARAM`` n/a
``ETHTOOL_SRINGPARAM`` ``ETHTOOL_MSG_RINGS_SET``
``ETHTOOL_GPAUSEPARAM`` n/a
``ETHTOOL_SPAUSEPARAM`` n/a
``ETHTOOL_GRXCSUM`` ``ETHTOOL_MSG_FEATURES_GET``

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

@ -29,6 +29,7 @@ enum {
ETHTOOL_MSG_PRIVFLAGS_GET,
ETHTOOL_MSG_PRIVFLAGS_SET,
ETHTOOL_MSG_RINGS_GET,
ETHTOOL_MSG_RINGS_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,

5
net/ethtool/netlink.c
View file

@ -756,6 +756,11 @@ static const struct genl_ops ethtool_genl_ops[] = {
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
{
.cmd = ETHTOOL_MSG_RINGS_SET,
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_rings,
},
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {

1
net/ethtool/netlink.h
View file

@ -347,5 +347,6 @@ int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info);
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);
#endif /* _NET_ETHTOOL_NETLINK_H */

89
net/ethtool/rings.c
View file

@ -106,3 +106,92 @@ const struct ethnl_request_ops ethnl_rings_request_ops = {
.reply_size = rings_reply_size,
.fill_reply = rings_fill_reply,
};
/* RINGS_SET */
static const struct nla_policy
rings_set_policy[ETHTOOL_A_RINGS_MAX + 1] = {
[ETHTOOL_A_RINGS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_RINGS_RX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_MINI_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_JUMBO_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_TX_MAX] = { .type = NLA_REJECT },
[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 nlattr *tb[ETHTOOL_A_RINGS_MAX + 1];
struct ethtool_ringparam ringparam = {};
struct ethnl_req_info req_info = {};
const struct nlattr *err_attr;
const struct ethtool_ops *ops;
struct net_device *dev;
bool mod = false;
int ret;
ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
ETHTOOL_A_RINGS_MAX, rings_set_policy,
info->extack);
if (ret < 0)
return 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 exceeeds maximum");
goto out_ops;
}
ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
dev_put(dev);
return ret;
}