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![Shay Agroskin](/assets/img/avatar_default.png)
This attribute, which is part of ethtool's ring param configuration allows the user to specify the maximum number of the packet's payload that can be written directly to the device. Example usage: # ethtool -G [interface] tx-push-buf-len [number of bytes] Co-developed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Shay Agroskin <shayagr@amazon.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
458 lines
19 KiB
C
458 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _NET_ETHTOOL_NETLINK_H
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#define _NET_ETHTOOL_NETLINK_H
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#include <linux/ethtool_netlink.h>
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#include <linux/netdevice.h>
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#include <net/genetlink.h>
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#include <net/sock.h>
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struct ethnl_req_info;
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int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
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const struct nlattr *nest, struct net *net,
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struct netlink_ext_ack *extack,
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bool require_dev);
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int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
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u16 attrtype);
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struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
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u16 hdr_attrtype, struct genl_info *info,
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void **ehdrp);
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void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd);
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void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd);
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int ethnl_multicast(struct sk_buff *skb, struct net_device *dev);
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/**
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* ethnl_strz_size() - calculate attribute length for fixed size string
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* @s: ETH_GSTRING_LEN sized string (may not be null terminated)
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*
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* Return: total length of an attribute with null terminated string from @s
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*/
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static inline int ethnl_strz_size(const char *s)
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{
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return nla_total_size(strnlen(s, ETH_GSTRING_LEN) + 1);
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}
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/**
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* ethnl_put_strz() - put string attribute with fixed size string
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* @skb: skb with the message
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* @attrtype: attribute type
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* @s: ETH_GSTRING_LEN sized string (may not be null terminated)
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*
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* Puts an attribute with null terminated string from @s into the message.
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*
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* Return: 0 on success, negative error code on failure
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*/
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static inline int ethnl_put_strz(struct sk_buff *skb, u16 attrtype,
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const char *s)
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{
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unsigned int len = strnlen(s, ETH_GSTRING_LEN);
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struct nlattr *attr;
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attr = nla_reserve(skb, attrtype, len + 1);
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if (!attr)
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return -EMSGSIZE;
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memcpy(nla_data(attr), s, len);
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((char *)nla_data(attr))[len] = '\0';
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return 0;
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}
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/**
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* ethnl_update_u32() - update u32 value from NLA_U32 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Copy the u32 value from NLA_U32 netlink attribute @attr into variable
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* pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
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* is set to true if this function changed the value of *dst, otherwise it
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* is left as is.
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*/
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static inline void ethnl_update_u32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u32 val;
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if (!attr)
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return;
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val = nla_get_u32(attr);
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if (*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_u8() - update u8 value from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Copy the u8 value from NLA_U8 netlink attribute @attr into variable
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* pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
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* is set to true if this function changed the value of *dst, otherwise it
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* is left as is.
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*/
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static inline void ethnl_update_u8(u8 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = nla_get_u8(attr);
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if (*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_bool32() - update u32 used as bool from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the u8 value from NLA_U8 netlink attribute @attr to set u32 variable
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* pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
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* null. Bool pointed to by @mod is set to true if this function changed the
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* logical value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_bool32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = !!nla_get_u8(attr);
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if (!!*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_bool() - updateb bool used as bool from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the bool value from NLA_U8 netlink attribute @attr to set bool variable
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* pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
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* null. Bool pointed to by @mod is set to true if this function changed the
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* logical value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_bool(bool *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = !!nla_get_u8(attr);
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if (!!*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_binary() - update binary data from NLA_BINARY attribute
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* @dst: value to update
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* @len: destination buffer length
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the u8 value from NLA_U8 netlink attribute @attr to rewrite data block
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* of length @len at @dst by attribute payload; do nothing if @attr is null.
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* Bool pointed to by @mod is set to true if this function changed the logical
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* value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_binary(void *dst, unsigned int len,
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const struct nlattr *attr, bool *mod)
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{
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if (!attr)
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return;
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if (nla_len(attr) < len)
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len = nla_len(attr);
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if (!memcmp(dst, nla_data(attr), len))
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return;
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memcpy(dst, nla_data(attr), len);
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*mod = true;
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}
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/**
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* ethnl_update_bitfield32() - update u32 value from NLA_BITFIELD32 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Update bits in u32 value which are set in attribute's mask to values from
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* attribute's value. Do nothing if @attr is null or the value wouldn't change;
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* otherwise, set bool pointed to by @mod to true.
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*/
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static inline void ethnl_update_bitfield32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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struct nla_bitfield32 change;
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u32 newval;
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if (!attr)
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return;
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change = nla_get_bitfield32(attr);
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newval = (*dst & ~change.selector) | (change.value & change.selector);
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if (*dst == newval)
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return;
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*dst = newval;
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*mod = true;
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}
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/**
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* ethnl_reply_header_size() - total size of reply header
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*
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* This is an upper estimate so that we do not need to hold RTNL lock longer
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* than necessary (to prevent rename between size estimate and composing the
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* message). Accounts only for device ifindex and name as those are the only
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* attributes ethnl_fill_reply_header() puts into the reply header.
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*/
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static inline unsigned int ethnl_reply_header_size(void)
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{
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return nla_total_size(nla_total_size(sizeof(u32)) +
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nla_total_size(IFNAMSIZ));
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}
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/* GET request handling */
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/* Unified processing of GET requests uses two data structures: request info
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* and reply data. Request info holds information parsed from client request
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* and its stays constant through all request processing. Reply data holds data
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* retrieved from ethtool_ops callbacks or other internal sources which is used
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* to compose the reply. When processing a dump request, request info is filled
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* only once (when the request message is parsed) but reply data is filled for
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* each reply message.
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*
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* Both structures consist of part common for all request types (struct
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* ethnl_req_info and struct ethnl_reply_data defined below) and optional
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* parts specific for each request type. Common part always starts at offset 0.
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*/
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/**
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* struct ethnl_req_info - base type of request information for GET requests
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* @dev: network device the request is for (may be null)
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* @dev_tracker: refcount tracker for @dev reference
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* @flags: request flags common for all request types
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*
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* This is a common base for request specific structures holding data from
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* parsed userspace request. These always embed struct ethnl_req_info at
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* zero offset.
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*/
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struct ethnl_req_info {
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struct net_device *dev;
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netdevice_tracker dev_tracker;
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u32 flags;
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};
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static inline void ethnl_parse_header_dev_put(struct ethnl_req_info *req_info)
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{
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netdev_put(req_info->dev, &req_info->dev_tracker);
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}
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/**
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* struct ethnl_reply_data - base type of reply data for GET requests
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* @dev: device for current reply message; in single shot requests it is
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* equal to ðnl_req_info.dev; in dumps it's different for each
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* reply message
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*
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* This is a common base for request specific structures holding data for
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* kernel reply message. These always embed struct ethnl_reply_data at zero
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* offset.
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*/
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struct ethnl_reply_data {
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struct net_device *dev;
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};
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int ethnl_ops_begin(struct net_device *dev);
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void ethnl_ops_complete(struct net_device *dev);
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/**
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* struct ethnl_request_ops - unified handling of GET and SET requests
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* @request_cmd: command id for request (GET)
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* @reply_cmd: command id for reply (GET_REPLY)
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* @hdr_attr: attribute type for request header
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* @req_info_size: size of request info
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* @reply_data_size: size of reply data
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* @allow_nodev_do: allow non-dump request with no device identification
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* @set_ntf_cmd: notification to generate on changes (SET)
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* @parse_request:
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* Parse request except common header (struct ethnl_req_info). Common
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* header is already filled on entry, the rest up to @repdata_offset
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* is zero initialized. This callback should only modify type specific
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* request info by parsed attributes from request message.
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* @prepare_data:
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* Retrieve and prepare data needed to compose a reply message. Calls to
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* ethtool_ops handlers are limited to this callback. Common reply data
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* (struct ethnl_reply_data) is filled on entry, type specific part after
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* it is zero initialized. This callback should only modify the type
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* specific part of reply data. Device identification from struct
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* ethnl_reply_data is to be used as for dump requests, it iterates
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* through network devices while dev member of struct ethnl_req_info
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* points to the device from client request.
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* @reply_size:
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* Estimate reply message size. Returned value must be sufficient for
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* message payload without common reply header. The callback may returned
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* estimate higher than actual message size if exact calculation would
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* not be worth the saved memory space.
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* @fill_reply:
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* Fill reply message payload (except for common header) from reply data.
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* The callback must not generate more payload than previously called
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* ->reply_size() estimated.
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* @cleanup_data:
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* Optional cleanup called when reply data is no longer needed. Can be
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* used e.g. to free any additional data structures outside the main
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* structure which were allocated by ->prepare_data(). When processing
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* dump requests, ->cleanup() is called for each message.
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* @set_validate:
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* Check if set operation is supported for a given device, and perform
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* extra input checks. Expected return values:
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* - 0 if the operation is a noop for the device (rare)
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* - 1 if operation should proceed to calling @set
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* - negative errno on errors
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* Called without any locks, just a reference on the netdev.
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* @set:
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* Execute the set operation. The implementation should return
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* - 0 if no configuration has changed
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* - 1 if configuration changed and notification should be generated
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* - negative errno on errors
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*
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* Description of variable parts of GET request handling when using the
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* unified infrastructure. When used, a pointer to an instance of this
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* structure is to be added to ðnl_default_requests array and generic
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* handlers ethnl_default_doit(), ethnl_default_dumpit(),
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* ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops;
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* ethnl_default_notify() can be used in @ethnl_notify_handlers to send
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* notifications of the corresponding type.
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*/
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struct ethnl_request_ops {
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u8 request_cmd;
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u8 reply_cmd;
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u16 hdr_attr;
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unsigned int req_info_size;
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unsigned int reply_data_size;
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bool allow_nodev_do;
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u8 set_ntf_cmd;
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int (*parse_request)(struct ethnl_req_info *req_info,
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struct nlattr **tb,
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struct netlink_ext_ack *extack);
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int (*prepare_data)(const struct ethnl_req_info *req_info,
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struct ethnl_reply_data *reply_data,
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struct genl_info *info);
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int (*reply_size)(const struct ethnl_req_info *req_info,
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const struct ethnl_reply_data *reply_data);
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int (*fill_reply)(struct sk_buff *skb,
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const struct ethnl_req_info *req_info,
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const struct ethnl_reply_data *reply_data);
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void (*cleanup_data)(struct ethnl_reply_data *reply_data);
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int (*set_validate)(struct ethnl_req_info *req_info,
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struct genl_info *info);
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int (*set)(struct ethnl_req_info *req_info,
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struct genl_info *info);
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};
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/* request handlers */
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extern const struct ethnl_request_ops ethnl_strset_request_ops;
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extern const struct ethnl_request_ops ethnl_linkinfo_request_ops;
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extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
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extern const struct ethnl_request_ops ethnl_linkstate_request_ops;
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extern const struct ethnl_request_ops ethnl_debug_request_ops;
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extern const struct ethnl_request_ops ethnl_wol_request_ops;
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extern const struct ethnl_request_ops ethnl_features_request_ops;
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extern const struct ethnl_request_ops ethnl_privflags_request_ops;
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extern const struct ethnl_request_ops ethnl_rings_request_ops;
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extern const struct ethnl_request_ops ethnl_channels_request_ops;
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extern const struct ethnl_request_ops ethnl_coalesce_request_ops;
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extern const struct ethnl_request_ops ethnl_pause_request_ops;
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extern const struct ethnl_request_ops ethnl_eee_request_ops;
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extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
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extern const struct ethnl_request_ops ethnl_fec_request_ops;
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extern const struct ethnl_request_ops ethnl_module_eeprom_request_ops;
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extern const struct ethnl_request_ops ethnl_stats_request_ops;
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extern const struct ethnl_request_ops ethnl_phc_vclocks_request_ops;
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extern const struct ethnl_request_ops ethnl_module_request_ops;
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extern const struct ethnl_request_ops ethnl_pse_request_ops;
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extern const struct ethnl_request_ops ethnl_rss_request_ops;
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extern const struct ethnl_request_ops ethnl_plca_cfg_request_ops;
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extern const struct ethnl_request_ops ethnl_plca_status_request_ops;
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extern const struct ethnl_request_ops ethnl_mm_request_ops;
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extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
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extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
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extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_COUNTS_ONLY + 1];
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extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];
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extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];
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extern const struct nla_policy ethnl_linkmodes_get_policy[ETHTOOL_A_LINKMODES_HEADER + 1];
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extern const struct nla_policy ethnl_linkmodes_set_policy[ETHTOOL_A_LINKMODES_LANES + 1];
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extern const struct nla_policy ethnl_linkstate_get_policy[ETHTOOL_A_LINKSTATE_HEADER + 1];
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extern const struct nla_policy ethnl_debug_get_policy[ETHTOOL_A_DEBUG_HEADER + 1];
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extern const struct nla_policy ethnl_debug_set_policy[ETHTOOL_A_DEBUG_MSGMASK + 1];
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extern const struct nla_policy ethnl_wol_get_policy[ETHTOOL_A_WOL_HEADER + 1];
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extern const struct nla_policy ethnl_wol_set_policy[ETHTOOL_A_WOL_SOPASS + 1];
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extern const struct nla_policy ethnl_features_get_policy[ETHTOOL_A_FEATURES_HEADER + 1];
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extern const struct nla_policy ethnl_features_set_policy[ETHTOOL_A_FEATURES_WANTED + 1];
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extern const struct nla_policy ethnl_privflags_get_policy[ETHTOOL_A_PRIVFLAGS_HEADER + 1];
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extern const struct nla_policy ethnl_privflags_set_policy[ETHTOOL_A_PRIVFLAGS_FLAGS + 1];
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extern const struct nla_policy ethnl_rings_get_policy[ETHTOOL_A_RINGS_HEADER + 1];
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extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN_MAX + 1];
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extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1];
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extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1];
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extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
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extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1];
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extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
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extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
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extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
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extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1];
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extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_HEADER + 1];
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extern const struct nla_policy ethnl_cable_test_act_policy[ETHTOOL_A_CABLE_TEST_HEADER + 1];
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extern const struct nla_policy ethnl_cable_test_tdr_act_policy[ETHTOOL_A_CABLE_TEST_TDR_CFG + 1];
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extern const struct nla_policy ethnl_tunnel_info_get_policy[ETHTOOL_A_TUNNEL_INFO_HEADER + 1];
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extern const struct nla_policy ethnl_fec_get_policy[ETHTOOL_A_FEC_HEADER + 1];
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extern const struct nla_policy ethnl_fec_set_policy[ETHTOOL_A_FEC_AUTO + 1];
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extern const struct nla_policy ethnl_module_eeprom_get_policy[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS + 1];
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extern const struct nla_policy ethnl_stats_get_policy[ETHTOOL_A_STATS_SRC + 1];
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extern const struct nla_policy ethnl_phc_vclocks_get_policy[ETHTOOL_A_PHC_VCLOCKS_HEADER + 1];
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extern const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER + 1];
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extern const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1];
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extern const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1];
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extern const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1];
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extern const struct nla_policy ethnl_rss_get_policy[ETHTOOL_A_RSS_CONTEXT + 1];
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extern const struct nla_policy ethnl_plca_get_cfg_policy[ETHTOOL_A_PLCA_HEADER + 1];
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extern const struct nla_policy ethnl_plca_set_cfg_policy[ETHTOOL_A_PLCA_MAX + 1];
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extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADER + 1];
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extern const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1];
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extern const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1];
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int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
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int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info);
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int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info);
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int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info);
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int ethnl_tunnel_info_start(struct netlink_callback *cb);
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int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
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extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_mac_names[__ETHTOOL_A_STATS_ETH_MAC_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_ctrl_names[__ETHTOOL_A_STATS_ETH_CTRL_CNT][ETH_GSTRING_LEN];
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extern const char stats_rmon_names[__ETHTOOL_A_STATS_RMON_CNT][ETH_GSTRING_LEN];
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#endif /* _NET_ETHTOOL_NETLINK_H */
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