Merge branch 'ethtool-netlink-interface-part-3'

Michal Kubecek says:

====================
ethtool netlink interface, part 3

Implementation of more netlink request types:

  - netdev features (ethtool -k/-K, patches 3-6)
  - private flags (--show-priv-flags / --set-priv-flags, patches 7-9)
  - ring sizes (ethtool -g/-G, patches 10-12)
  - channel counts (ethtool -l/-L, patches 13-15)

Patch 1 is a style cleanup suggested in part 2 review and patch 2 updates
the mapping between netdev features and legacy ioctl requests (which are
still used by ethtool for backward compatibility).

Changes in v2:
  - fix netdev reference leaks in error path of ethnl_set_rings() and
    ethnl_set_channels() (found by Jakub Kicinski)
  - use __set_bit() rather than set_bit() (suggested by David Miller)
  - in replies to RINGS_GET and CHANNELS_GET requests, omit ring and
    channel types not supported by driver/device (suggested by Jakub
    Kicinski)
  - more descriptive message size calculations in rings_reply_size() and
    channels_reply_size() (suggested by Jakub Kicinski)
  - coding style cleanup (suggested by Jakub Kicinski)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/ethtool-netlink.rst

@@ -189,6 +189,14 @@ Userspace to kernel:
   ``ETHTOOL_MSG_DEBUG_SET``             set debugging settings
   ``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
+  ``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
+  ``ETHTOOL_MSG_CHANNELS_GET``          get channel counts
+  ``ETHTOOL_MSG_CHANNELS_SET``          set channel counts
   ===================================== ================================
 
 Kernel to userspace:
@@ -204,6 +212,15 @@ Kernel to userspace:
   ``ETHTOOL_MSG_DEBUG_NTF``             debugging settings notification
   ``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
+  ``ETHTOOL_MSG_FEATURES_NTF``          netdev features notification
+  ``ETHTOOL_MSG_PRIVFLAGS_GET_REPLY``   private flags
+  ``ETHTOOL_MSG_PRIVFLAGS_NTF``         private flags
+  ``ETHTOOL_MSG_RINGS_GET_REPLY``       ring sizes
+  ``ETHTOOL_MSG_RINGS_NTF``             ring sizes
+  ``ETHTOOL_MSG_CHANNELS_GET_REPLY``    channel counts
+  ``ETHTOOL_MSG_CHANNELS_NTF``          channel counts
   ===================================== =================================
 
 ``GET`` requests are sent by userspace applications to retrieve device
@@ -521,6 +538,213 @@ Request contents:
 ``WAKE_MAGICSECURE`` mode.
 
 
+FEATURES_GET
+============
+
+Gets netdev features like ``ETHTOOL_GFEATURES`` ioctl request.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_FEATURES_HEADER``         nested  request header
+  ====================================  ======  ==========================
+
+Kernel response contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_FEATURES_HEADER``         nested  reply header
+  ``ETHTOOL_A_FEATURES_HW``             bitset  dev->hw_features
+  ``ETHTOOL_A_FEATURES_WANTED``         bitset  dev->wanted_features
+  ``ETHTOOL_A_FEATURES_ACTIVE``         bitset  dev->features
+  ``ETHTOOL_A_FEATURES_NOCHANGE``       bitset  NETIF_F_NEVER_CHANGE
+  ====================================  ======  ==========================
+
+Bitmaps in kernel response have the same meaning as bitmaps used in ioctl
+interference but attribute names are different (they are based on
+corresponding members of struct net_device). Legacy "flags" are not provided,
+if userspace needs them (most likely only ethtool for backward compatibility),
+it can calculate their values from related feature bits itself.
+ETHA_FEATURES_HW uses mask consisting of all features recognized by kernel (to
+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).
+
+``ETHTOOL_MSG_FEATURES_NTF`` notification is sent not only if device features
+are modified using ``ETHTOOL_MSG_FEATURES_SET`` request or on of ethtool ioctl
+request but also each time features are modified with netdev_update_features()
+or netdev_change_features().
+
+
+PRIVFLAGS_GET
+=============
+
+Gets private flags like ``ETHTOOL_GPFLAGS`` ioctl request.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_PRIVFLAGS_HEADER``        nested  request header
+  ====================================  ======  ==========================
+
+Kernel response contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_PRIVFLAGS_HEADER``        nested  reply header
+  ``ETHTOOL_A_PRIVFLAGS_FLAGS``         bitset  private flags
+  ====================================  ======  ==========================
+
+``ETHTOOL_A_PRIVFLAGS_FLAGS`` is a bitset with values of device private flags.
+These flags are defined by driver, their number and names (and also meaning)
+are device dependent. For compact bitset format, names can be retrieved as
+``ETH_SS_PRIV_FLAGS`` string set. If verbose bitset format is requested,
+response uses all private flags supported by the device as mask so that client
+gets the full information without having to fetch the string set with names.
+
+
+PRIVFLAGS_SET
+=============
+
+Sets or modifies values of device private flags like ``ETHTOOL_SPFLAGS``
+ioctl request.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_PRIVFLAGS_HEADER``        nested  request header
+  ``ETHTOOL_A_PRIVFLAGS_FLAGS``         bitset  private flags
+  ====================================  ======  ==========================
+
+``ETHTOOL_A_PRIVFLAGS_FLAGS`` can either set the whole set of private flags or
+modify only values of some of them.
+
+
+RINGS_GET
+=========
+
+Gets ring sizes like ``ETHTOOL_GRINGPARAM`` ioctl request.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_RINGS_HEADER``            nested  request header
+  ====================================  ======  ==========================
+
+Kernel response contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_RINGS_HEADER``            nested  reply header
+  ``ETHTOOL_A_RINGS_RX_MAX``            u32     max size of RX ring
+  ``ETHTOOL_A_RINGS_RX_MINI_MAX``       u32     max size of RX mini ring
+  ``ETHTOOL_A_RINGS_RX_JUMBO_MAX``      u32     max size of RX jumbo ring
+  ``ETHTOOL_A_RINGS_TX_MAX``            u32     max size of TX ring
+  ``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
+  ====================================  ======  ==========================
+
+
+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.
+
+
+CHANNELS_GET
+============
+
+Gets channel counts like ``ETHTOOL_GCHANNELS`` ioctl request.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_CHANNELS_HEADER``         nested  request header
+  ====================================  ======  ==========================
+
+Kernel response contents:
+
+  =====================================  ======  ==========================
+  ``ETHTOOL_A_CHANNELS_HEADER``          nested  reply header
+  ``ETHTOOL_A_CHANNELS_RX_MAX``          u32     max receive channels
+  ``ETHTOOL_A_CHANNELS_TX_MAX``          u32     max transmit channels
+  ``ETHTOOL_A_CHANNELS_OTHER_MAX``       u32     max other channels
+  ``ETHTOOL_A_CHANNELS_COMBINED_MAX``    u32     max combined channels
+  ``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
+  =====================================  ======  ==========================
+
+
+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
 ===================
 
@@ -547,35 +771,35 @@ have their netlink replacement yet.
   ``ETHTOOL_SEEPROM``                 n/a
   ``ETHTOOL_GCOALESCE``               n/a
   ``ETHTOOL_SCOALESCE``               n/a
-  ``ETHTOOL_GRINGPARAM``              n/a
-  ``ETHTOOL_SRINGPARAM``              n/a
+  ``ETHTOOL_GRINGPARAM``              ``ETHTOOL_MSG_RINGS_GET``
+  ``ETHTOOL_SRINGPARAM``              ``ETHTOOL_MSG_RINGS_SET``
   ``ETHTOOL_GPAUSEPARAM``             n/a
   ``ETHTOOL_SPAUSEPARAM``             n/a
-  ``ETHTOOL_GRXCSUM``                 n/a
-  ``ETHTOOL_SRXCSUM``                 n/a
-  ``ETHTOOL_GTXCSUM``                 n/a
-  ``ETHTOOL_STXCSUM``                 n/a
-  ``ETHTOOL_GSG``                     n/a
-  ``ETHTOOL_SSG``                     n/a
+  ``ETHTOOL_GRXCSUM``                 ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SRXCSUM``                 ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GTXCSUM``                 ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_STXCSUM``                 ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GSG``                     ``ETHTOOL_MSG_FEATURES_GET``
+  ``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``                    n/a
-  ``ETHTOOL_STSO``                    n/a
+  ``ETHTOOL_GTSO``                    ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_STSO``                    ``ETHTOOL_MSG_FEATURES_SET``
   ``ETHTOOL_GPERMADDR``               rtnetlink ``RTM_GETLINK``
-  ``ETHTOOL_GUFO``                    n/a
-  ``ETHTOOL_SUFO``                    n/a
-  ``ETHTOOL_GGSO``                    n/a
-  ``ETHTOOL_SGSO``                    n/a
-  ``ETHTOOL_GFLAGS``                  n/a
-  ``ETHTOOL_SFLAGS``                  n/a
-  ``ETHTOOL_GPFLAGS``                 n/a
-  ``ETHTOOL_SPFLAGS``                 n/a
+  ``ETHTOOL_GUFO``                    ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SUFO``                    ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GGSO``                    ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SGSO``                    ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GFLAGS``                  ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SFLAGS``                  ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GPFLAGS``                 ``ETHTOOL_MSG_PRIVFLAGS_GET``
+  ``ETHTOOL_SPFLAGS``                 ``ETHTOOL_MSG_PRIVFLAGS_SET``
   ``ETHTOOL_GRXFH``                   n/a
   ``ETHTOOL_SRXFH``                   n/a
-  ``ETHTOOL_GGRO``                    n/a
-  ``ETHTOOL_SGRO``                    n/a
+  ``ETHTOOL_GGRO``                    ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SGRO``                    ``ETHTOOL_MSG_FEATURES_SET``
   ``ETHTOOL_GRXRINGS``                n/a
   ``ETHTOOL_GRXCLSRLCNT``             n/a
   ``ETHTOOL_GRXCLSRULE``              n/a
@@ -589,10 +813,10 @@ have their netlink replacement yet.
   ``ETHTOOL_GSSET_INFO``              ``ETHTOOL_MSG_STRSET_GET``
   ``ETHTOOL_GRXFHINDIR``              n/a
   ``ETHTOOL_SRXFHINDIR``              n/a
-  ``ETHTOOL_GFEATURES``               n/a
-  ``ETHTOOL_SFEATURES``               n/a
-  ``ETHTOOL_GCHANNELS``               n/a
-  ``ETHTOOL_SCHANNELS``               n/a
+  ``ETHTOOL_GFEATURES``               ``ETHTOOL_MSG_FEATURES_GET``
+  ``ETHTOOL_SFEATURES``               ``ETHTOOL_MSG_FEATURES_SET``
+  ``ETHTOOL_GCHANNELS``               ``ETHTOOL_MSG_CHANNELS_GET``
+  ``ETHTOOL_SCHANNELS``               ``ETHTOOL_MSG_CHANNELS_SET``
   ``ETHTOOL_SET_DUMP``                n/a
   ``ETHTOOL_GET_DUMP_FLAG``           n/a
   ``ETHTOOL_GET_DUMP_DATA``           n/a

include/uapi/linux/ethtool_netlink.h

@@ -24,6 +24,14 @@ enum {
 	ETHTOOL_MSG_DEBUG_SET,
 	ETHTOOL_MSG_WOL_GET,
 	ETHTOOL_MSG_WOL_SET,
+	ETHTOOL_MSG_FEATURES_GET,
+	ETHTOOL_MSG_FEATURES_SET,
+	ETHTOOL_MSG_PRIVFLAGS_GET,
+	ETHTOOL_MSG_PRIVFLAGS_SET,
+	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,
@@ -43,6 +51,15 @@ enum {
 	ETHTOOL_MSG_DEBUG_NTF,
 	ETHTOOL_MSG_WOL_GET_REPLY,
 	ETHTOOL_MSG_WOL_NTF,
+	ETHTOOL_MSG_FEATURES_GET_REPLY,
+	ETHTOOL_MSG_FEATURES_SET_REPLY,
+	ETHTOOL_MSG_FEATURES_NTF,
+	ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
+	ETHTOOL_MSG_PRIVFLAGS_NTF,
+	ETHTOOL_MSG_RINGS_GET_REPLY,
+	ETHTOOL_MSG_RINGS_NTF,
+	ETHTOOL_MSG_CHANNELS_GET_REPLY,
+	ETHTOOL_MSG_CHANNELS_NTF,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_KERNEL_CNT,
@@ -228,6 +245,71 @@ enum {
 	ETHTOOL_A_WOL_MAX = __ETHTOOL_A_WOL_CNT - 1
 };
 
+/* FEATURES */
+
+enum {
+	ETHTOOL_A_FEATURES_UNSPEC,
+	ETHTOOL_A_FEATURES_HEADER,			/* nest - _A_HEADER_* */
+	ETHTOOL_A_FEATURES_HW,				/* bitset */
+	ETHTOOL_A_FEATURES_WANTED,			/* bitset */
+	ETHTOOL_A_FEATURES_ACTIVE,			/* bitset */
+	ETHTOOL_A_FEATURES_NOCHANGE,			/* bitset */
+
+	/* add new constants above here */
+	__ETHTOOL_A_FEATURES_CNT,
+	ETHTOOL_A_FEATURES_MAX = __ETHTOOL_A_FEATURES_CNT - 1
+};
+
+/* PRIVFLAGS */
+
+enum {
+	ETHTOOL_A_PRIVFLAGS_UNSPEC,
+	ETHTOOL_A_PRIVFLAGS_HEADER,			/* nest - _A_HEADER_* */
+	ETHTOOL_A_PRIVFLAGS_FLAGS,			/* bitset */
+
+	/* add new constants above here */
+	__ETHTOOL_A_PRIVFLAGS_CNT,
+	ETHTOOL_A_PRIVFLAGS_MAX = __ETHTOOL_A_PRIVFLAGS_CNT - 1
+};
+
+/* RINGS */
+
+enum {
+	ETHTOOL_A_RINGS_UNSPEC,
+	ETHTOOL_A_RINGS_HEADER,				/* nest - _A_HEADER_* */
+	ETHTOOL_A_RINGS_RX_MAX,				/* u32 */
+	ETHTOOL_A_RINGS_RX_MINI_MAX,			/* u32 */
+	ETHTOOL_A_RINGS_RX_JUMBO_MAX,			/* u32 */
+	ETHTOOL_A_RINGS_TX_MAX,				/* u32 */
+	ETHTOOL_A_RINGS_RX,				/* u32 */
+	ETHTOOL_A_RINGS_RX_MINI,			/* u32 */
+	ETHTOOL_A_RINGS_RX_JUMBO,			/* u32 */
+	ETHTOOL_A_RINGS_TX,				/* u32 */
+
+	/* add new constants above here */
+	__ETHTOOL_A_RINGS_CNT,
+	ETHTOOL_A_RINGS_MAX = (__ETHTOOL_A_RINGS_CNT - 1)
+};
+
+/* CHANNELS */
+
+enum {
+	ETHTOOL_A_CHANNELS_UNSPEC,
+	ETHTOOL_A_CHANNELS_HEADER,			/* nest - _A_HEADER_* */
+	ETHTOOL_A_CHANNELS_RX_MAX,			/* u32 */
+	ETHTOOL_A_CHANNELS_TX_MAX,			/* u32 */
+	ETHTOOL_A_CHANNELS_OTHER_MAX,			/* u32 */
+	ETHTOOL_A_CHANNELS_COMBINED_MAX,		/* u32 */
+	ETHTOOL_A_CHANNELS_RX_COUNT,			/* u32 */
+	ETHTOOL_A_CHANNELS_TX_COUNT,			/* u32 */
+	ETHTOOL_A_CHANNELS_OTHER_COUNT,			/* u32 */
+	ETHTOOL_A_CHANNELS_COMBINED_COUNT,		/* u32 */
+
+	/* add new constants above here */
+	__ETHTOOL_A_CHANNELS_CNT,
+	ETHTOOL_A_CHANNELS_MAX = (__ETHTOOL_A_CHANNELS_CNT - 1)
+};
+
 /* generic netlink info */
 #define ETHTOOL_GENL_NAME "ethtool"
 #define ETHTOOL_GENL_VERSION 1

net/ethtool/Makefile

@@ -5,4 +5,5 @@ obj-y				+= ioctl.o common.o
 obj-$(CONFIG_ETHTOOL_NETLINK)	+= ethtool_nl.o
 
 ethtool_nl-y	:= netlink.o bitset.o strset.o linkinfo.o linkmodes.o \
-		   linkstate.o debug.o wol.o
+		   linkstate.o debug.o wol.o features.o privflags.o rings.o \
+		   channels.o

net/ethtool/bitset.c

@@ -588,6 +588,100 @@ int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
 	return 0;
 }
 
+/**
+ * ethnl_parse_bitset() - Compute effective value and mask from bitset nest
+ * @val:     unsigned long based bitmap to put value into
+ * @mask:    unsigned long based bitmap to put mask into
+ * @nbits:   size of @val and @mask bitmaps
+ * @attr:    nest attribute to parse and apply
+ * @names:   array of bit names; may be null for compact format
+ * @extack:  extack for error reporting
+ *
+ * Provide @nbits size long bitmaps for value and mask so that
+ * x = (val & mask) | (x & ~mask) would modify any @nbits sized bitmap x
+ * the same way ethnl_update_bitset() with the same bitset attribute would.
+ *
+ * Return:   negative error code on failure, 0 on success
+ */
+int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
+		       unsigned int nbits, const struct nlattr *attr,
+		       ethnl_string_array_t names,
+		       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
+	const struct nlattr *bit_attr;
+	bool no_mask;
+	int rem;
+	int ret;
+
+	if (!attr)
+		return 0;
+	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
+			       extack);
+	if (ret < 0)
+		return ret;
+	no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
+
+	if (!tb[ETHTOOL_A_BITSET_BITS]) {
+		unsigned int change_bits;
+
+		ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
+		if (ret < 0)
+			return ret;
+
+		change_bits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
+		bitmap_from_arr32(val, nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
+				  change_bits);
+		if (change_bits < nbits)
+			bitmap_clear(val, change_bits, nbits - change_bits);
+		if (no_mask) {
+			bitmap_fill(mask, nbits);
+		} else {
+			bitmap_from_arr32(mask,
+					  nla_data(tb[ETHTOOL_A_BITSET_MASK]),
+					  change_bits);
+			if (change_bits < nbits)
+				bitmap_clear(mask, change_bits,
+					     nbits - change_bits);
+		}
+
+		return 0;
+	}
+
+	if (tb[ETHTOOL_A_BITSET_VALUE]) {
+		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
+				    "value only allowed in compact bitset");
+		return -EINVAL;
+	}
+	if (tb[ETHTOOL_A_BITSET_MASK]) {
+		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
+				    "mask only allowed in compact bitset");
+		return -EINVAL;
+	}
+
+	bitmap_zero(val, nbits);
+	if (no_mask)
+		bitmap_fill(mask, nbits);
+	else
+		bitmap_zero(mask, nbits);
+
+	nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
+		unsigned int idx;
+		bool bit_val;
+
+		ret = ethnl_parse_bit(&idx, &bit_val, nbits, bit_attr, no_mask,
+				      names, extack);
+		if (ret < 0)
+			return ret;
+		if (bit_val)
+			__set_bit(idx, val);
+		if (!no_mask)
+			__set_bit(idx, mask);
+	}
+
+	return 0;
+}
+
 #if BITS_PER_LONG == 64 && defined(__BIG_ENDIAN)
 
 /* 64-bit big endian architectures are the only case when u32 based bitmaps

net/ethtool/bitset.h

@@ -26,5 +26,9 @@ int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
 int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
 			  const struct nlattr *attr, ethnl_string_array_t names,
 			  struct netlink_ext_ack *extack, bool *mod);
+int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
+		       unsigned int nbits, const struct nlattr *attr,
+		       ethnl_string_array_t names,
+		       struct netlink_ext_ack *extack);
 
 #endif /* _NET_ETHTOOL_BITSET_H */

net/ethtool/channels.c

+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <net/xdp_sock.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)
+
+static const struct nla_policy
+channels_get_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_REJECT },
+	[ETHTOOL_A_CHANNELS_TX_COUNT]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_CHANNELS_OTHER_COUNT]	= { .type = NLA_REJECT },
+	[ETHTOOL_A_CHANNELS_COMBINED_COUNT]	= { .type = NLA_REJECT },
+};
+
+static int channels_prepare_data(const struct ethnl_req_info *req_base,
+				 struct ethnl_reply_data *reply_base,
+				 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;
+}
+
+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,
+	.max_attr		= ETHTOOL_A_CHANNELS_MAX,
+	.req_info_size		= sizeof(struct channels_req_info),
+	.reply_data_size	= sizeof(struct channels_reply_data),
+	.request_policy		= channels_get_policy,
+
+	.prepare_data		= channels_prepare_data,
+	.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);
+	if (ret < 0)
+		goto out_ops;
+	ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL);
+
+out_ops:
+	ethnl_ops_complete(dev);
+out_rtnl:
+	rtnl_unlock();
+out_dev:
+	dev_put(dev);
+	return ret;
+}

net/ethtool/common.c

@@ -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;
+}

net/ethtool/common.h

@@ -6,6 +6,8 @@
 #include <linux/netdevice.h>
 #include <linux/ethtool.h>
 
+#define ETHTOOL_DEV_FEATURE_WORDS	DIV_ROUND_UP(NETDEV_FEATURE_COUNT, 32)
+
 /* compose link mode index from speed, type and duplex */
 #define ETHTOOL_LINK_MODE(speed, type, duplex) \
 	ETHTOOL_LINK_MODE_ ## speed ## base ## type ## _ ## duplex ## _BIT
@@ -27,5 +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 */

net/ethtool/debug.c

@@ -102,8 +102,10 @@ int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info)
 			  info->extack);
 	if (ret < 0)
 		return ret;
-	ret = ethnl_parse_header(&req_info, tb[ETHTOOL_A_DEBUG_HEADER],
-				 genl_info_net(info), info->extack, true);
+	ret = ethnl_parse_header_dev_get(&req_info,
+					 tb[ETHTOOL_A_DEBUG_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
 	if (ret < 0)
 		return ret;
 	dev = req_info.dev;

net/ethtool/features.c

+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct features_req_info {
+	struct ethnl_req_info	base;
+};
+
+struct features_reply_data {
+	struct ethnl_reply_data	base;
+	u32			hw[ETHTOOL_DEV_FEATURE_WORDS];
+	u32			wanted[ETHTOOL_DEV_FEATURE_WORDS];
+	u32			active[ETHTOOL_DEV_FEATURE_WORDS];
+	u32			nochange[ETHTOOL_DEV_FEATURE_WORDS];
+	u32			all[ETHTOOL_DEV_FEATURE_WORDS];
+};
+
+#define FEATURES_REPDATA(__reply_base) \
+	container_of(__reply_base, struct features_reply_data, base)
+
+static const struct nla_policy
+features_get_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_REJECT },
+	[ETHTOOL_A_FEATURES_ACTIVE]	= { .type = NLA_REJECT },
+	[ETHTOOL_A_FEATURES_NOCHANGE]	= { .type = NLA_REJECT },
+};
+
+static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
+{
+	unsigned int i;
+
+	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
+		dest[i] = src >> (32 * i);
+}
+
+static int features_prepare_data(const struct ethnl_req_info *req_base,
+				 struct ethnl_reply_data *reply_base,
+				 struct genl_info *info)
+{
+	struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+	struct net_device *dev = reply_base->dev;
+	netdev_features_t all_features;
+
+	ethnl_features_to_bitmap32(data->hw, dev->hw_features);
+	ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
+	ethnl_features_to_bitmap32(data->active, dev->features);
+	ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
+	all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
+	ethnl_features_to_bitmap32(data->all, all_features);
+
+	return 0;
+}
+
+static int features_reply_size(const struct ethnl_req_info *req_base,
+			       const struct ethnl_reply_data *reply_base)
+{
+	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+	unsigned int len = 0;
+	int ret;
+
+	ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
+				  netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
+				  netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
+				  netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
+				  netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	len += ret;
+
+	return len;
+}
+
+static int features_fill_reply(struct sk_buff *skb,
+			       const struct ethnl_req_info *req_base,
+			       const struct ethnl_reply_data *reply_base)
+{
+	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+	int ret;
+
+	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
+				 data->all, NETDEV_FEATURE_COUNT,
+				 netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
+				 NULL, NETDEV_FEATURE_COUNT,
+				 netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
+				 NULL, NETDEV_FEATURE_COUNT,
+				 netdev_features_strings, compact);
+	if (ret < 0)
+		return ret;
+	return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
+				  data->nochange, NULL, NETDEV_FEATURE_COUNT,
+				  netdev_features_strings, compact);
+}
+
+const struct ethnl_request_ops ethnl_features_request_ops = {
+	.request_cmd		= ETHTOOL_MSG_FEATURES_GET,
+	.reply_cmd		= ETHTOOL_MSG_FEATURES_GET_REPLY,
+	.hdr_attr		= ETHTOOL_A_FEATURES_HEADER,
+	.max_attr		= ETHTOOL_A_FEATURES_MAX,
+	.req_info_size		= sizeof(struct features_req_info),
+	.reply_data_size	= sizeof(struct features_reply_data),
+	.request_policy		= features_get_policy,
+
+	.prepare_data		= features_prepare_data,
+	.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;
+	bool mod;
+	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);
+	mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);
+
+	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);
+	}
+	if (mod)
+		ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
+
+out_rtnl:
+	rtnl_unlock();
+	dev_put(dev);
+	return ret;
+}

net/ethtool/ioctl.c

@@ -56,8 +56,6 @@ EXPORT_SYMBOL(ethtool_op_get_ts_info);
 
 /* Handlers for each ethtool command */
 
-#define ETHTOOL_DEV_FEATURE_WORDS	((NETDEV_FEATURE_COUNT + 31) / 32)
-
 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_gfeatures cmd = {
@@ -198,13 +196,14 @@ static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
 	switch (eth_cmd) {
 	case ETHTOOL_GTXCSUM:
 	case ETHTOOL_STXCSUM:
-		return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
+		return NETIF_F_CSUM_MASK | NETIF_F_FCOE_CRC_BIT |
+		       NETIF_F_SCTP_CRC;
 	case ETHTOOL_GRXCSUM:
 	case ETHTOOL_SRXCSUM:
 		return NETIF_F_RXCSUM;
 	case ETHTOOL_GSG:
 	case ETHTOOL_SSG:
-		return NETIF_F_SG;
+		return NETIF_F_SG | NETIF_F_FRAGLIST;
 	case ETHTOOL_GTSO:
 	case ETHTOOL_STSO:
 		return NETIF_F_ALL_TSO;
@@ -930,37 +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)
 {
@@ -1636,6 +1604,7 @@ static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
+	int ret;
 
 	if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
 		return -EOPNOTSUPP;
@@ -1652,7 +1621,10 @@ static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
 	    ringparam.tx_pending > max.tx_max_pending)
 		return -EINVAL;
 
-	return dev->ethtool_ops->set_ringparam(dev, &ringparam);
+	ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
+	if (!ret)
+		ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
+	return ret;
 }
 
 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
@@ -1677,6 +1649,7 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 	u16 from_channel, to_channel;
 	u32 max_rx_in_use = 0;
 	unsigned int i;
+	int ret;
 
 	if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
 		return -EOPNOTSUPP;
@@ -1708,7 +1681,10 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 		if (xdp_get_umem_from_qid(dev, i))
 			return -EINVAL;
 
-	return dev->ethtool_ops->set_channels(dev, &channels);
+	ret = dev->ethtool_ops->set_channels(dev, &channels);
+	if (!ret)
+		ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL);
+	return ret;
 }
 
 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
@@ -2717,6 +2693,8 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
 	case ETHTOOL_GPFLAGS:
 		rc = ethtool_get_value(dev, useraddr, ethcmd,
 				       dev->ethtool_ops->get_priv_flags);
+		if (!rc)
+			ethtool_notify(dev, ETHTOOL_MSG_PRIVFLAGS_NTF, NULL);
 		break;
 	case ETHTOOL_SPFLAGS:
 		rc = ethtool_set_value(dev, useraddr,

net/ethtool/linkinfo.c

@@ -121,8 +121,10 @@ int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info)
 			  info->extack);
 	if (ret < 0)
 		return ret;
-	ret = ethnl_parse_header(&req_info, tb[ETHTOOL_A_LINKINFO_HEADER],
-				 genl_info_net(info), info->extack, true);
+	ret = ethnl_parse_header_dev_get(&req_info,
+					 tb[ETHTOOL_A_LINKINFO_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
 	if (ret < 0)
 		return ret;
 	dev = req_info.dev;

net/ethtool/linkmodes.c

@@ -334,8 +334,10 @@ int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
 			  info->extack);
 	if (ret < 0)
 		return ret;
-	ret = ethnl_parse_header(&req_info, tb[ETHTOOL_A_LINKMODES_HEADER],
-				 genl_info_net(info), info->extack, true);
+	ret = ethnl_parse_header_dev_get(&req_info,
+					 tb[ETHTOOL_A_LINKMODES_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
 	if (ret < 0)
 		return ret;
 	dev = req_info.dev;

net/ethtool/netlink.c

@@ -18,7 +18,7 @@ static const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_MAX + 1] = {
 };
 
 /**
- * ethnl_parse_header() - parse request header
+ * ethnl_parse_header_dev_get() - parse request header
  * @req_info:    structure to put results into
  * @header:      nest attribute with request header
  * @net:         request netns
@@ -33,7 +33,7 @@ static const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_MAX + 1] = {
  *
  * Return: 0 on success or negative error code
  */
-int ethnl_parse_header(struct ethnl_req_info *req_info,
+int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
 			       const struct nlattr *header, struct net *net,
 			       struct netlink_ext_ack *extack, bool require_dev)
 {
@@ -215,6 +215,10 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 	[ETHTOOL_MSG_LINKSTATE_GET]	= &ethnl_linkstate_request_ops,
 	[ETHTOOL_MSG_DEBUG_GET]		= &ethnl_debug_request_ops,
 	[ETHTOOL_MSG_WOL_GET]		= &ethnl_wol_request_ops,
+	[ETHTOOL_MSG_FEATURES_GET]	= &ethnl_features_request_ops,
+	[ETHTOOL_MSG_PRIVFLAGS_GET]	= &ethnl_privflags_request_ops,
+	[ETHTOOL_MSG_RINGS_GET]		= &ethnl_rings_request_ops,
+	[ETHTOOL_MSG_CHANNELS_GET]	= &ethnl_channels_request_ops,
 };
 
 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -253,8 +257,8 @@ static int ethnl_default_parse(struct ethnl_req_info *req_info,
 			  request_ops->request_policy, extack);
 	if (ret < 0)
 		goto out;
-	ret = ethnl_parse_header(req_info, tb[request_ops->hdr_attr], net,
-				 extack, require_dev);
+	ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
+					 net, extack, require_dev);
 	if (ret < 0)
 		goto out;
 
@@ -527,6 +531,10 @@ ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 	[ETHTOOL_MSG_LINKMODES_NTF]	= &ethnl_linkmodes_request_ops,
 	[ETHTOOL_MSG_DEBUG_NTF]		= &ethnl_debug_request_ops,
 	[ETHTOOL_MSG_WOL_NTF]		= &ethnl_wol_request_ops,
+	[ETHTOOL_MSG_FEATURES_NTF]	= &ethnl_features_request_ops,
+	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= &ethnl_privflags_request_ops,
+	[ETHTOOL_MSG_RINGS_NTF]		= &ethnl_rings_request_ops,
+	[ETHTOOL_MSG_CHANNELS_NTF]	= &ethnl_channels_request_ops,
 };
 
 /* default notification handler */
@@ -612,6 +620,10 @@ static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 	[ETHTOOL_MSG_LINKMODES_NTF]	= ethnl_default_notify,
 	[ETHTOOL_MSG_DEBUG_NTF]		= ethnl_default_notify,
 	[ETHTOOL_MSG_WOL_NTF]		= ethnl_default_notify,
+	[ETHTOOL_MSG_FEATURES_NTF]	= ethnl_default_notify,
+	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= ethnl_default_notify,
+	[ETHTOOL_MSG_RINGS_NTF]		= ethnl_default_notify,
+	[ETHTOOL_MSG_CHANNELS_NTF]	= ethnl_default_notify,
 };
 
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
@@ -629,6 +641,29 @@ void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 }
 EXPORT_SYMBOL(ethtool_notify);
 
+static void ethnl_notify_features(struct netdev_notifier_info *info)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(info);
+
+	ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
+}
+
+static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
+			      void *ptr)
+{
+	switch (event) {
+	case NETDEV_FEAT_CHANGE:
+		ethnl_notify_features(ptr);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block ethnl_netdev_notifier = {
+	.notifier_call = ethnl_netdev_event,
+};
+
 /* genetlink setup */
 
 static const struct genl_ops ethtool_genl_ops[] = {
@@ -695,6 +730,54 @@ static const struct genl_ops ethtool_genl_ops[] = {
 		.flags	= GENL_UNS_ADMIN_PERM,
 		.doit	= ethnl_set_wol,
 	},
+	{
+		.cmd	= ETHTOOL_MSG_FEATURES_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_FEATURES_SET,
+		.flags	= GENL_UNS_ADMIN_PERM,
+		.doit	= ethnl_set_features,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_PRIVFLAGS_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_PRIVFLAGS_SET,
+		.flags	= GENL_UNS_ADMIN_PERM,
+		.doit	= ethnl_set_privflags,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_RINGS_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_RINGS_SET,
+		.flags	= GENL_UNS_ADMIN_PERM,
+		.doit	= ethnl_set_rings,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_CHANNELS_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.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[] = {
@@ -723,7 +806,9 @@ static int __init ethnl_init(void)
 		return ret;
 	ethnl_ok = true;
 
-	return 0;
+	ret = register_netdevice_notifier(&ethnl_netdev_notifier);
+	WARN(ret < 0, "ethtool: net device notifier registration failed");
+	return ret;
 }
 
 subsys_initcall(ethnl_init);

net/ethtool/netlink.h

@@ -10,9 +10,10 @@
 
 struct ethnl_req_info;
 
-int ethnl_parse_header(struct ethnl_req_info *req_info,
+int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
 			       const struct nlattr *nest, struct net *net,
-		       struct netlink_ext_ack *extack, bool require_dev);
+			       struct netlink_ext_ack *extack,
+			       bool require_dev);
 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
 			    u16 attrtype);
 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
@@ -336,10 +337,18 @@ extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
 extern const struct ethnl_request_ops ethnl_linkstate_request_ops;
 extern const struct ethnl_request_ops ethnl_debug_request_ops;
 extern const struct ethnl_request_ops ethnl_wol_request_ops;
+extern const struct ethnl_request_ops ethnl_features_request_ops;
+extern const struct ethnl_request_ops ethnl_privflags_request_ops;
+extern const struct ethnl_request_ops ethnl_rings_request_ops;
+extern const struct ethnl_request_ops ethnl_channels_request_ops;
 
 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);
+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 */

net/ethtool/privflags.c

+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct privflags_req_info {
+	struct ethnl_req_info		base;
+};
+
+struct privflags_reply_data {
+	struct ethnl_reply_data		base;
+	const char			(*priv_flag_names)[ETH_GSTRING_LEN];
+	unsigned int			n_priv_flags;
+	u32				priv_flags;
+};
+
+#define PRIVFLAGS_REPDATA(__reply_base) \
+	container_of(__reply_base, struct privflags_reply_data, base)
+
+static const struct nla_policy
+privflags_get_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
+	[ETHTOOL_A_PRIVFLAGS_UNSPEC]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_PRIVFLAGS_HEADER]		= { .type = NLA_NESTED },
+	[ETHTOOL_A_PRIVFLAGS_FLAGS]		= { .type = NLA_REJECT },
+};
+
+static int ethnl_get_priv_flags_info(struct net_device *dev,
+				     unsigned int *count,
+				     const char (**names)[ETH_GSTRING_LEN])
+{
+	const struct ethtool_ops *ops = dev->ethtool_ops;
+	int nflags;
+
+	nflags = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
+	if (nflags < 0)
+		return nflags;
+
+	if (names) {
+		*names = kcalloc(nflags, ETH_GSTRING_LEN, GFP_KERNEL);
+		if (!*names)
+			return -ENOMEM;
+		ops->get_strings(dev, ETH_SS_PRIV_FLAGS, (u8 *)*names);
+	}
+
+	/* We can pass more than 32 private flags to userspace via netlink but
+	 * we cannot get more with ethtool_ops::get_priv_flags(). Note that we
+	 * must not adjust nflags before allocating the space for flag names
+	 * as the buffer must be large enough for all flags.
+	 */
+	if (WARN_ONCE(nflags > 32,
+		      "device %s reports more than 32 private flags (%d)\n",
+		      netdev_name(dev), nflags))
+		nflags = 32;
+	*count = nflags;
+
+	return 0;
+}
+
+static int privflags_prepare_data(const struct ethnl_req_info *req_base,
+				  struct ethnl_reply_data *reply_base,
+				  struct genl_info *info)
+{
+	struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
+	struct net_device *dev = reply_base->dev;
+	const char (*names)[ETH_GSTRING_LEN];
+	const struct ethtool_ops *ops;
+	unsigned int nflags;
+	int ret;
+
+	ops = dev->ethtool_ops;
+	if (!ops->get_priv_flags || !ops->get_sset_count || !ops->get_strings)
+		return -EOPNOTSUPP;
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = ethnl_get_priv_flags_info(dev, &nflags, &names);
+	if (ret < 0)
+		goto out_ops;
+	data->priv_flags = ops->get_priv_flags(dev);
+	data->priv_flag_names = names;
+	data->n_priv_flags = nflags;
+
+out_ops:
+	ethnl_ops_complete(dev);
+	return ret;
+}
+
+static int privflags_reply_size(const struct ethnl_req_info *req_base,
+				const struct ethnl_reply_data *reply_base)
+{
+	const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
+	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+	const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags);
+
+	return ethnl_bitset32_size(&data->priv_flags, &all_flags,
+				   data->n_priv_flags,
+				   data->priv_flag_names, compact);
+}
+
+static int privflags_fill_reply(struct sk_buff *skb,
+				const struct ethnl_req_info *req_base,
+				const struct ethnl_reply_data *reply_base)
+{
+	const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base);
+	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+	const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags);
+
+	return ethnl_put_bitset32(skb, ETHTOOL_A_PRIVFLAGS_FLAGS,
+				  &data->priv_flags, &all_flags,
+				  data->n_priv_flags, data->priv_flag_names,
+				  compact);
+}
+
+static void privflags_cleanup_data(struct ethnl_reply_data *reply_data)
+{
+	struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_data);
+
+	kfree(data->priv_flag_names);
+}
+
+const struct ethnl_request_ops ethnl_privflags_request_ops = {
+	.request_cmd		= ETHTOOL_MSG_PRIVFLAGS_GET,
+	.reply_cmd		= ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
+	.hdr_attr		= ETHTOOL_A_PRIVFLAGS_HEADER,
+	.max_attr		= ETHTOOL_A_PRIVFLAGS_MAX,
+	.req_info_size		= sizeof(struct privflags_req_info),
+	.reply_data_size	= sizeof(struct privflags_reply_data),
+	.request_policy		= privflags_get_policy,
+
+	.prepare_data		= privflags_prepare_data,
+	.reply_size		= privflags_reply_size,
+	.fill_reply		= privflags_fill_reply,
+	.cleanup_data		= privflags_cleanup_data,
+};
+
+/* PRIVFLAGS_SET */
+
+static const struct nla_policy
+privflags_set_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
+	[ETHTOOL_A_PRIVFLAGS_UNSPEC]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_PRIVFLAGS_HEADER]		= { .type = NLA_NESTED },
+	[ETHTOOL_A_PRIVFLAGS_FLAGS]		= { .type = NLA_NESTED },
+};
+
+int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr *tb[ETHTOOL_A_PRIVFLAGS_MAX + 1];
+	const char (*names)[ETH_GSTRING_LEN] = NULL;
+	struct ethnl_req_info req_info = {};
+	const struct ethtool_ops *ops;
+	struct net_device *dev;
+	unsigned int nflags;
+	bool mod = false;
+	bool compact;
+	u32 flags;
+	int ret;
+
+	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
+			  ETHTOOL_A_PRIVFLAGS_MAX, privflags_set_policy,
+			  info->extack);
+	if (ret < 0)
+		return ret;
+	if (!tb[ETHTOOL_A_PRIVFLAGS_FLAGS])
+		return -EINVAL;
+	ret = ethnl_bitset_is_compact(tb[ETHTOOL_A_PRIVFLAGS_FLAGS], &compact);
+	if (ret < 0)
+		return ret;
+	ret = ethnl_parse_header_dev_get(&req_info,
+					 tb[ETHTOOL_A_PRIVFLAGS_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
+	if (ret < 0)
+		return ret;
+	dev = req_info.dev;
+	ops = dev->ethtool_ops;
+	if (!ops->get_priv_flags || !ops->set_priv_flags ||
+	    !ops->get_sset_count || !ops->get_strings)
+		return -EOPNOTSUPP;
+
+	rtnl_lock();
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		goto out_rtnl;
+	ret = ethnl_get_priv_flags_info(dev, &nflags, compact ? NULL : &names);
+	if (ret < 0)
+		goto out_ops;
+	flags = ops->get_priv_flags(dev);
+
+	ret = ethnl_update_bitset32(&flags, nflags,
+				    tb[ETHTOOL_A_PRIVFLAGS_FLAGS], names,
+				    info->extack, &mod);
+	if (ret < 0 || !mod)
+		goto out_free;
+	ret = ops->set_priv_flags(dev, flags);
+	if (ret < 0)
+		goto out_free;
+	ethtool_notify(dev, ETHTOOL_MSG_PRIVFLAGS_NTF, NULL);
+
+out_free:
+	kfree(names);
+out_ops:
+	ethnl_ops_complete(dev);
+out_rtnl:
+	rtnl_unlock();
+	dev_put(dev);
+	return ret;
+}

net/ethtool/rings.c

+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "netlink.h"
+#include "common.h"
+
+struct rings_req_info {
+	struct ethnl_req_info		base;
+};
+
+struct rings_reply_data {
+	struct ethnl_reply_data		base;
+	struct ethtool_ringparam	ringparam;
+};
+
+#define RINGS_REPDATA(__reply_base) \
+	container_of(__reply_base, struct rings_reply_data, base)
+
+static const struct nla_policy
+rings_get_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_REJECT },
+	[ETHTOOL_A_RINGS_RX_MINI]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_RINGS_RX_JUMBO]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_RINGS_TX]			= { .type = NLA_REJECT },
+};
+
+static int rings_prepare_data(const struct ethnl_req_info *req_base,
+			      struct ethnl_reply_data *reply_base,
+			      struct genl_info *info)
+{
+	struct rings_reply_data *data = RINGS_REPDATA(reply_base);
+	struct net_device *dev = reply_base->dev;
+	int ret;
+
+	if (!dev->ethtool_ops->get_ringparam)
+		return -EOPNOTSUPP;
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		return ret;
+	dev->ethtool_ops->get_ringparam(dev, &data->ringparam);
+	ethnl_ops_complete(dev);
+
+	return 0;
+}
+
+static int rings_reply_size(const struct ethnl_req_info *req_base,
+			    const struct ethnl_reply_data *reply_base)
+{
+	return nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MAX */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MINI_MAX */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_JUMBO_MAX */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_TX_MAX */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MINI */
+	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_JUMBO */
+	       nla_total_size(sizeof(u32));	/* _RINGS_TX */
+}
+
+static int rings_fill_reply(struct sk_buff *skb,
+			    const struct ethnl_req_info *req_base,
+			    const struct ethnl_reply_data *reply_base)
+{
+	const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
+	const struct ethtool_ringparam *ringparam = &data->ringparam;
+
+	if ((ringparam->rx_max_pending &&
+	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
+			  ringparam->rx_max_pending) ||
+	      nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
+			  ringparam->rx_pending))) ||
+	    (ringparam->rx_mini_max_pending &&
+	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
+			  ringparam->rx_mini_max_pending) ||
+	      nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
+			  ringparam->rx_mini_pending))) ||
+	    (ringparam->rx_jumbo_max_pending &&
+	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
+			  ringparam->rx_jumbo_max_pending) ||
+	      nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
+			  ringparam->rx_jumbo_pending))) ||
+	    (ringparam->tx_max_pending &&
+	     (nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
+			  ringparam->tx_max_pending) ||
+	      nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
+			  ringparam->tx_pending))))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+const struct ethnl_request_ops ethnl_rings_request_ops = {
+	.request_cmd		= ETHTOOL_MSG_RINGS_GET,
+	.reply_cmd		= ETHTOOL_MSG_RINGS_GET_REPLY,
+	.hdr_attr		= ETHTOOL_A_RINGS_HEADER,
+	.max_attr		= ETHTOOL_A_RINGS_MAX,
+	.req_info_size		= sizeof(struct rings_req_info),
+	.reply_data_size	= sizeof(struct rings_reply_data),
+	.request_policy		= rings_get_policy,
+
+	.prepare_data		= rings_prepare_data,
+	.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);
+	if (ret < 0)
+		goto out_ops;
+	ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
+
+out_ops:
+	ethnl_ops_complete(dev);
+out_rtnl:
+	rtnl_unlock();
+out_dev:
+	dev_put(dev);
+	return ret;
+}

net/ethtool/wol.c

@@ -123,8 +123,9 @@ int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info)
 			  wol_set_policy, info->extack);
 	if (ret < 0)
 		return ret;
-	ret = ethnl_parse_header(&req_info, tb[ETHTOOL_A_WOL_HEADER],
-				 genl_info_net(info), info->extack, true);
+	ret = ethnl_parse_header_dev_get(&req_info, tb[ETHTOOL_A_WOL_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
 	if (ret < 0)
 		return ret;
 	dev = req_info.dev;