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ethtool: set netdev features with FEATURES_SET request

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Implement FEATURES_SET netlink request to set network device features.
These are traditionally set using ETHTOOL_SFEATURES ioctl request.

Actual change is subject to netdev_change_features() sanity checks so that
it can differ from what was requested. Unlike with most other SET requests,
in addition to error code and optional extack, kernel provides an optional
reply message (ETHTOOL_MSG_FEATURES_SET_REPLY) in the same format but with
different semantics: information about difference between user request and
actual result and difference between old and new state of dev->features.
This reply message can be suppressed by setting ETHTOOL_FLAG_OMIT_REPLY
flag in request header.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek 2020-03-12 21:07:58 +01:00 committed by David S. Miller
parent 88db6d1e4f
commit 0980bfcd69
5 changed files with 224 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
Documentation/networking/ethtool-netlink.rst
View File

@ -190,6 +190,7 @@ Userspace to kernel:
``ETHTOOL_MSG_WOL_GET`` get wake-on-lan settings
``ETHTOOL_MSG_WOL_SET`` set wake-on-lan settings
``ETHTOOL_MSG_FEATURES_GET`` get device features
``ETHTOOL_MSG_FEATURES_SET`` set device features
===================================== ================================
Kernel to userspace:
@ -206,6 +207,7 @@ Kernel to userspace:
``ETHTOOL_MSG_WOL_GET_REPLY`` wake-on-lan settings
``ETHTOOL_MSG_WOL_NTF`` wake-on-lan settings notification
``ETHTOOL_MSG_FEATURES_GET_REPLY`` device features
``ETHTOOL_MSG_FEATURES_SET_REPLY`` optional reply to FEATURES_SET
===================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@ -554,6 +556,42 @@ provide all names when using verbose bitmap format), the other three use no
mask (simple bit lists).
FEATURES_SET
============
Request to set netdev features like ``ETHTOOL_SFEATURES`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested request header
``ETHTOOL_A_FEATURES_WANTED`` bitset requested features
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested reply header
``ETHTOOL_A_FEATURES_WANTED`` bitset diff wanted vs. result
``ETHTOOL_A_FEATURES_ACTIVE`` bitset diff old vs. new active
==================================== ====== ==========================
Request constains only one bitset which can be either value/mask pair (request
to change specific feature bits and leave the rest) or only a value (request
to set all features to specified set).
As request is subject to netdev_change_features() sanity checks, optional
kernel reply (can be suppressed by ``ETHTOOL_FLAG_OMIT_REPLY`` flag in request
header) informs client about the actual result. ``ETHTOOL_A_FEATURES_WANTED``
reports the difference between client request and actual result: mask consists
of bits which differ between requested features and result (dev->features
after the operation), value consists of values of these bits in the request
(i.e. negated values from resulting features). ``ETHTOOL_A_FEATURES_ACTIVE``
reports the difference between old and new dev->features: mask consists of
bits which have changed, values are their values in new dev->features (after
the operation).
Request translation
===================
@ -585,30 +623,30 @@ have their netlink replacement yet.
``ETHTOOL_GPAUSEPARAM`` n/a
``ETHTOOL_SPAUSEPARAM`` n/a
``ETHTOOL_GRXCSUM`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SRXCSUM`` n/a
``ETHTOOL_SRXCSUM`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GTXCSUM`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_STXCSUM`` n/a
``ETHTOOL_STXCSUM`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GSG`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SSG`` n/a
``ETHTOOL_SSG`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_TEST`` n/a
``ETHTOOL_GSTRINGS`` ``ETHTOOL_MSG_STRSET_GET``
``ETHTOOL_PHYS_ID`` n/a
``ETHTOOL_GSTATS`` n/a
``ETHTOOL_GTSO`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_STSO`` n/a
``ETHTOOL_STSO`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GPERMADDR`` rtnetlink ``RTM_GETLINK``
``ETHTOOL_GUFO`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SUFO`` n/a
``ETHTOOL_SUFO`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GGSO`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SGSO`` n/a
``ETHTOOL_SGSO`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GFLAGS`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SFLAGS`` n/a
``ETHTOOL_SFLAGS`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GPFLAGS`` n/a
``ETHTOOL_SPFLAGS`` n/a
``ETHTOOL_GRXFH`` n/a
``ETHTOOL_SRXFH`` n/a
``ETHTOOL_GGRO`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SGRO`` n/a
``ETHTOOL_SGRO`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GRXRINGS`` n/a
``ETHTOOL_GRXCLSRLCNT`` n/a
``ETHTOOL_GRXCLSRULE`` n/a
@ -623,7 +661,7 @@ have their netlink replacement yet.
``ETHTOOL_GRXFHINDIR`` n/a
``ETHTOOL_SRXFHINDIR`` n/a
``ETHTOOL_GFEATURES`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SFEATURES`` n/a
``ETHTOOL_SFEATURES`` ``ETHTOOL_MSG_FEATURES_SET``
``ETHTOOL_GCHANNELS`` n/a
``ETHTOOL_SCHANNELS`` n/a
``ETHTOOL_SET_DUMP`` n/a

2
include/uapi/linux/ethtool_netlink.h
View File

@ -25,6 +25,7 @@ enum {
ETHTOOL_MSG_WOL_GET,
ETHTOOL_MSG_WOL_SET,
ETHTOOL_MSG_FEATURES_GET,
ETHTOOL_MSG_FEATURES_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
@ -45,6 +46,7 @@ enum {
ETHTOOL_MSG_WOL_GET_REPLY,
ETHTOOL_MSG_WOL_NTF,
ETHTOOL_MSG_FEATURES_GET_REPLY,
ETHTOOL_MSG_FEATURES_SET_REPLY,
/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,

169
net/ethtool/features.c
View File

@ -129,3 +129,172 @@ const struct ethnl_request_ops ethnl_features_request_ops = {
.reply_size = features_reply_size,
.fill_reply = features_fill_reply,
};
/* FEATURES_SET */
static const struct nla_policy
features_set_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
[ETHTOOL_A_FEATURES_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_FEATURES_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_FEATURES_HW] = { .type = NLA_REJECT },
[ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_NESTED },
[ETHTOOL_A_FEATURES_ACTIVE] = { .type = NLA_REJECT },
[ETHTOOL_A_FEATURES_NOCHANGE] = { .type = NLA_REJECT },
};
static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
{
const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
unsigned int i;
bitmap_zero(dest, NETDEV_FEATURE_COUNT);
for (i = 0; i < words; i++)
dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
}
static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
{
const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
netdev_features_t ret = 0;
unsigned int i;
for (i = 0; i < words; i++)
ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
return ret;
}
static int features_send_reply(struct net_device *dev, struct genl_info *info,
const unsigned long *wanted,
const unsigned long *wanted_mask,
const unsigned long *active,
const unsigned long *active_mask, bool compact)
{
struct sk_buff *rskb;
void *reply_payload;
int reply_len = 0;
int ret;
reply_len = ethnl_reply_header_size();
ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto err;
reply_len += ret;
ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto err;
reply_len += ret;
ret = -ENOMEM;
rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
ETHTOOL_A_FEATURES_HEADER, info,
&reply_payload);
if (!rskb)
goto err;
ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
wanted_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto nla_put_failure;
ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
active_mask, NETDEV_FEATURE_COUNT,
netdev_features_strings, compact);
if (ret < 0)
goto nla_put_failure;
genlmsg_end(rskb, reply_payload);
ret = genlmsg_reply(rskb, info);
return ret;
nla_put_failure:
nlmsg_free(rskb);
WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
reply_len);
err:
GENL_SET_ERR_MSG(info, "failed to send reply message");
return ret;
}
int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
{
DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
struct ethnl_req_info req_info = {};
struct net_device *dev;
int ret;
ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
ETHTOOL_A_FEATURES_MAX, features_set_policy,
info->extack);
if (ret < 0)
return ret;
if (!tb[ETHTOOL_A_FEATURES_WANTED])
return -EINVAL;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_FEATURES_HEADER],
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
dev = req_info.dev;
rtnl_lock();
ethnl_features_to_bitmap(old_active, dev->features);
ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
tb[ETHTOOL_A_FEATURES_WANTED],
netdev_features_strings, info->extack);
if (ret < 0)
goto out_rtnl;
if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
ret = -EINVAL;
goto out_rtnl;
}
/* set req_wanted bits not in req_mask from old_active */
bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
bitmap_andnot(new_active, old_active, req_mask, NETDEV_FEATURE_COUNT);
bitmap_or(req_wanted, new_active, req_wanted, NETDEV_FEATURE_COUNT);
if (bitmap_equal(req_wanted, old_active, NETDEV_FEATURE_COUNT)) {
ret = 0;
goto out_rtnl;
}
dev->wanted_features = ethnl_bitmap_to_features(req_wanted);
__netdev_update_features(dev);
ethnl_features_to_bitmap(new_active, dev->features);
ret = 0;
if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;
bitmap_xor(wanted_diff_mask, req_wanted, new_active,
NETDEV_FEATURE_COUNT);
bitmap_xor(active_diff_mask, old_active, new_active,
NETDEV_FEATURE_COUNT);
bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
NETDEV_FEATURE_COUNT);
bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
NETDEV_FEATURE_COUNT);
bitmap_and(new_active, new_active, active_diff_mask,
NETDEV_FEATURE_COUNT);
ret = features_send_reply(dev, info, req_wanted,
wanted_diff_mask, new_active,
active_diff_mask, compact);
}
out_rtnl:
rtnl_unlock();
dev_put(dev);
return ret;
}

5
net/ethtool/netlink.c
View File

@ -703,6 +703,11 @@ static const struct genl_ops ethtool_genl_ops[] = {
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
{
.cmd = ETHTOOL_MSG_FEATURES_SET,
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_features,
},
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {

1
net/ethtool/netlink.h
View File

@ -343,5 +343,6 @@ int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
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);
#endif /* _NET_ETHTOOL_NETLINK_H */