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net: ethtool: Allow passing a phy index for some commands

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Some netlink commands are target towards ethernet PHYs, to control some
of their features. As there's several such commands, add the ability to
pass a PHY index in the ethnl request, which will populate the generic
ethnl_req_info with the relevant phydev when the command targets a PHY.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxime Chevallier 2023-12-21 19:00:38 +01:00 committed by David S. Miller
parent dedd702a35
commit 2ab0edb505
4 changed files with 37 additions and 2 deletions
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7
Documentation/networking/ethtool-netlink.rst
View file

@ -57,6 +57,7 @@ Structure of this header is
``ETHTOOL_A_HEADER_DEV_INDEX`` u32 device ifindex
``ETHTOOL_A_HEADER_DEV_NAME`` string device name
``ETHTOOL_A_HEADER_FLAGS`` u32 flags common for all requests
``ETHTOOL_A_HEADER_PHY_INDEX`` u32 phy device index
============================== ====== =============================
``ETHTOOL_A_HEADER_DEV_INDEX`` and ``ETHTOOL_A_HEADER_DEV_NAME`` identify the
@ -81,6 +82,12 @@ the behaviour is backward compatible, i.e. requests from old clients not aware
of the flag should be interpreted the way the client expects. A client must
not set flags it does not understand.
``ETHTOOL_A_HEADER_PHY_INDEX`` identify the ethernet PHY the message relates to.
As there are numerous commands that are related to PHY configuration, and because
we can have more than one PHY on the link, the PHY index can be passed in the
request for the commands that needs it. It is however not mandatory, and if it
is not passed for commands that target a PHY, the net_device.phydev pointer
is used, as a fallback that keeps the legacy behaviour.
Bit sets
========

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

@ -133,6 +133,7 @@ enum {
ETHTOOL_A_HEADER_DEV_INDEX, /* u32 */
ETHTOOL_A_HEADER_DEV_NAME, /* string */
ETHTOOL_A_HEADER_FLAGS, /* u32 - ETHTOOL_FLAG_* */
ETHTOOL_A_HEADER_PHY_INDEX, /* u32 */
/* add new constants above here */
__ETHTOOL_A_HEADER_CNT,

24
net/ethtool/netlink.c
View file

@ -4,6 +4,7 @@
#include <linux/ethtool_netlink.h>
#include <linux/pm_runtime.h>
#include "netlink.h"
#include <linux/phy_link_topology.h>
static struct genl_family ethtool_genl_family;
@ -20,6 +21,7 @@ const struct nla_policy ethnl_header_policy[] = {
.len = ALTIFNAMSIZ - 1 },
[ETHTOOL_A_HEADER_FLAGS] = NLA_POLICY_MASK(NLA_U32,
ETHTOOL_FLAGS_BASIC),
[ETHTOOL_A_HEADER_PHY_INDEX] = NLA_POLICY_MIN(NLA_U32, 1),
};
const struct nla_policy ethnl_header_policy_stats[] = {
@ -28,6 +30,7 @@ const struct nla_policy ethnl_header_policy_stats[] = {
.len = ALTIFNAMSIZ - 1 },
[ETHTOOL_A_HEADER_FLAGS] = NLA_POLICY_MASK(NLA_U32,
ETHTOOL_FLAGS_STATS),
[ETHTOOL_A_HEADER_PHY_INDEX] = NLA_POLICY_MIN(NLA_U32, 1),
};
int ethnl_ops_begin(struct net_device *dev)
@ -91,6 +94,7 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
{
struct nlattr *tb[ARRAY_SIZE(ethnl_header_policy)];
const struct nlattr *devname_attr;
struct phy_device *phydev = NULL;
struct net_device *dev = NULL;
u32 flags = 0;
int ret;
@ -145,6 +149,26 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
return -EINVAL;
}
if (dev) {
if (tb[ETHTOOL_A_HEADER_PHY_INDEX]) {
u32 phy_index = nla_get_u32(tb[ETHTOOL_A_HEADER_PHY_INDEX]);
phydev = phy_link_topo_get_phy(&dev->link_topo,
phy_index);
if (!phydev) {
NL_SET_ERR_MSG_ATTR(extack, header,
"no phy matches phy index");
return -EINVAL;
}
} else {
/* If we need a PHY but no phy index is specified, fallback
* to dev->phydev
*/
phydev = dev->phydev;
}
}
req_info->phydev = phydev;
req_info->dev = dev;
req_info->flags = flags;
return 0;

7
net/ethtool/netlink.h
View file

@ -250,6 +250,7 @@ static inline unsigned int ethnl_reply_header_size(void)
* @dev: network device the request is for (may be null)
* @dev_tracker: refcount tracker for @dev reference
* @flags: request flags common for all request types
* @phydev: phy_device connected to @dev this request is for (may be null)
*
* This is a common base for request specific structures holding data from
* parsed userspace request. These always embed struct ethnl_req_info at
@ -259,6 +260,7 @@ struct ethnl_req_info {
struct net_device *dev;
netdevice_tracker dev_tracker;
u32 flags;
struct phy_device *phydev;
};
static inline void ethnl_parse_header_dev_put(struct ethnl_req_info *req_info)
@ -395,9 +397,10 @@ extern const struct ethnl_request_ops ethnl_rss_request_ops;
extern const struct ethnl_request_ops ethnl_plca_cfg_request_ops;
extern const struct ethnl_request_ops ethnl_plca_status_request_ops;
extern const struct ethnl_request_ops ethnl_mm_request_ops;
extern const struct ethnl_request_ops ethnl_phy_request_ops;
extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_PHY_INDEX + 1];
extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_PHY_INDEX + 1];
extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_COUNTS_ONLY + 1];
extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];
extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];