Implement LINKINFO_SET netlink request to set link settings queried by LINKINFO_GET message.
Only physical port, phy MDIO address and MDI(-X) control can be set, attempt to modify MDI(-X) status and transceiver is rejected. When any data is modified, ETHTOOL_MSG_LINKINFO_NTF message in the same format as reply to LINKINFO_GET request is sent to notify userspace about the changes. The same notification is also sent when these settings are modified using the ioctl interface. Signed-off-by: Michal Kubecek <[email protected]> --- Documentation/networking/ethtool-netlink.rst | 25 +++++- include/uapi/linux/ethtool_netlink.h | 2 + net/ethtool/ioctl.c | 12 ++- net/ethtool/linkinfo.c | 83 ++++++++++++++++++++ net/ethtool/netlink.c | 11 +++ net/ethtool/netlink.h | 2 + 6 files changed, 131 insertions(+), 4 deletions(-) diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index 0d21469debec..48833b6092d9 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -168,6 +168,7 @@ Userspace to kernel: ===================================== ================================ ``ETHTOOL_MSG_STRSET_GET`` get string set ``ETHTOOL_MSG_LINKINFO_GET`` get link settings + ``ETHTOOL_MSG_LINKINFO_SET`` set link settings ===================================== ================================ Kernel to userspace: @@ -175,6 +176,7 @@ Kernel to userspace: ===================================== ================================ ``ETHTOOL_MSG_STRSET_GET_REPLY`` string set contents ``ETHTOOL_MSG_LINKINFO_GET_REPLY`` link settings + ``ETHTOOL_MSG_LINKINFO_NTF`` link settings notification ===================================== ================================ ``GET`` requests are sent by userspace applications to retrieve device @@ -300,6 +302,25 @@ corresponding ioctl structures. devices supporting the request). +LINKINFO_SET +============ + +``LINKINFO_SET`` request allows setting some of the attributes reported by +``LINKINFO_GET``. and The request has no request specific flags. + +Request contents: + + ==================================== ====== ========================== + ``ETHTOOL_A_LINKINFO_HEADER`` nested request header + ``ETHTOOL_A_LINKINFO_PORT`` u8 physical port + ``ETHTOOL_A_LINKINFO_PHYADDR`` u8 phy MDIO address + ``ETHTOOL_A_LINKINFO_TP_MDIX_CTRL`` u8 MDI(-X) control + ==================================== ====== ========================== + +MDI(-X) status and transceiver cannot be set, request with the corresponding +attributes is rejected. + + Request translation =================== @@ -311,7 +332,7 @@ have their netlink replacement yet. ioctl command netlink command =================================== ===================================== ``ETHTOOL_GSET`` ``ETHTOOL_MSG_LINKINFO_GET`` - ``ETHTOOL_SSET`` n/a + ``ETHTOOL_SSET`` ``ETHTOOL_MSG_LINKINFO_SET`` ``ETHTOOL_GDRVINFO`` n/a ``ETHTOOL_GREGS`` n/a ``ETHTOOL_GWOL`` n/a @@ -385,7 +406,7 @@ have their netlink replacement yet. ``ETHTOOL_GPHYSTATS`` n/a ``ETHTOOL_PERQUEUE`` n/a ``ETHTOOL_GLINKSETTINGS`` ``ETHTOOL_MSG_LINKINFO_GET`` - ``ETHTOOL_SLINKSETTINGS`` n/a + ``ETHTOOL_SLINKSETTINGS`` ``ETHTOOL_MSG_LINKINFO_SET`` ``ETHTOOL_PHY_GTUNABLE`` n/a ``ETHTOOL_PHY_STUNABLE`` n/a ``ETHTOOL_GFECPARAM`` n/a diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h index 56ab2a530d22..78ee5584d5da 100644 --- a/include/uapi/linux/ethtool_netlink.h +++ b/include/uapi/linux/ethtool_netlink.h @@ -16,6 +16,7 @@ enum { ETHTOOL_MSG_USER_NONE, ETHTOOL_MSG_STRSET_GET, ETHTOOL_MSG_LINKINFO_GET, + ETHTOOL_MSG_LINKINFO_SET, /* add new constants above here */ __ETHTOOL_MSG_USER_CNT, @@ -27,6 +28,7 @@ enum { ETHTOOL_MSG_KERNEL_NONE, ETHTOOL_MSG_STRSET_GET_REPLY, ETHTOOL_MSG_LINKINFO_GET_REPLY, + ETHTOOL_MSG_LINKINFO_NTF, /* add new constants above here */ __ETHTOOL_MSG_KERNEL_CNT, diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 2cd04cb6b4b9..0747fe6b5f4c 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -26,6 +26,7 @@ #include <net/devlink.h> #include <net/xdp_sock.h> #include <net/flow_offload.h> +#include <linux/ethtool_netlink.h> #include "common.h" @@ -565,7 +566,10 @@ static int ethtool_set_link_ksettings(struct net_device *dev, != link_ksettings.base.link_mode_masks_nwords) return -EINVAL; - return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings); + err = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings); + if (err >= 0) + ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL); + return err; } /* Query device for its ethtool_cmd settings. @@ -614,6 +618,7 @@ static int ethtool_set_settings(struct net_device *dev, void __user *useraddr) { struct ethtool_link_ksettings link_ksettings; struct ethtool_cmd cmd; + int ret; ASSERT_RTNL(); @@ -626,7 +631,10 @@ static int ethtool_set_settings(struct net_device *dev, void __user *useraddr) return -EINVAL; link_ksettings.base.link_mode_masks_nwords = __ETHTOOL_LINK_MODE_MASK_NU32; - return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings); + ret = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings); + if (ret >= 0) + ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL); + return ret; } static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev, diff --git a/net/ethtool/linkinfo.c b/net/ethtool/linkinfo.c index c28ca4d9dd2a..ea1997b154f0 100644 --- a/net/ethtool/linkinfo.c +++ b/net/ethtool/linkinfo.c @@ -95,3 +95,86 @@ const struct get_request_ops linkinfo_request_ops = { .reply_size = linkinfo_size, .fill_reply = linkinfo_fill, }; + +/* LINKINFO_SET */ + +static const struct nla_policy linkinfo_hdr_policy[ETHTOOL_A_HEADER_MAX + 1] = { + [ETHTOOL_A_HEADER_UNSPEC] = { .type = NLA_REJECT }, + [ETHTOOL_A_HEADER_DEV_INDEX] = { .type = NLA_U32 }, + [ETHTOOL_A_HEADER_DEV_NAME] = { .type = NLA_NUL_STRING, + .len = IFNAMSIZ - 1 }, + [ETHTOOL_A_HEADER_GFLAGS] = { .type = NLA_U32 }, + [ETHTOOL_A_HEADER_RFLAGS] = { .type = NLA_REJECT }, +}; + +static const struct nla_policy +linkinfo_set_policy[ETHTOOL_A_LINKINFO_MAX + 1] = { + [ETHTOOL_A_LINKINFO_UNSPEC] = { .type = NLA_REJECT }, + [ETHTOOL_A_LINKINFO_HEADER] = { .type = NLA_NESTED }, + [ETHTOOL_A_LINKINFO_PORT] = { .type = NLA_U8 }, + [ETHTOOL_A_LINKINFO_PHYADDR] = { .type = NLA_U8 }, + [ETHTOOL_A_LINKINFO_TP_MDIX] = { .type = NLA_REJECT }, + [ETHTOOL_A_LINKINFO_TP_MDIX_CTRL] = { .type = NLA_U8 }, + [ETHTOOL_A_LINKINFO_TRANSCEIVER] = { .type = NLA_REJECT }, +}; + +int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info) +{ + struct nlattr *tb[ETHTOOL_A_LINKINFO_MAX + 1]; + struct ethtool_link_ksettings ksettings = {}; + struct ethtool_link_settings *lsettings; + struct ethnl_req_info req_info = {}; + struct net_device *dev; + bool mod = false; + int ret; + + ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, + ETHTOOL_A_LINKINFO_MAX, linkinfo_set_policy, + info->extack); + if (ret < 0) + return ret; + ret = ethnl_parse_header(&req_info, tb[ETHTOOL_A_LINKINFO_HEADER], + genl_info_net(info), info->extack, + linkinfo_hdr_policy, true); + if (ret < 0) + return ret; + dev = req_info.dev; + if (!dev->ethtool_ops->get_link_ksettings || + !dev->ethtool_ops->set_link_ksettings) + return -EOPNOTSUPP; + + rtnl_lock(); + ret = ethnl_before_ops(dev); + if (ret < 0) + goto out_rtnl; + + ret = __ethtool_get_link_ksettings(dev, &ksettings); + if (ret < 0) { + if (info) + GENL_SET_ERR_MSG(info, "failed to retrieve link settings"); + goto out_ops; + } + lsettings = &ksettings.base; + + ethnl_update_u8(&lsettings->port, tb[ETHTOOL_A_LINKINFO_PORT], &mod); + ethnl_update_u8(&lsettings->phy_address, tb[ETHTOOL_A_LINKINFO_PHYADDR], + &mod); + ethnl_update_u8(&lsettings->eth_tp_mdix_ctrl, + tb[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL], &mod); + + ret = 0; + if (mod) { + ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings); + if (ret < 0) + GENL_SET_ERR_MSG(info, "link settings update failed"); + else + ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL); + } + +out_ops: + ethnl_after_ops(dev); +out_rtnl: + rtnl_unlock(); + dev_put(dev); + return ret; +} diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c index dc52d912e0dd..5b9d12656e97 100644 --- a/net/ethtool/netlink.c +++ b/net/ethtool/netlink.c @@ -603,6 +603,11 @@ static int ethnl_get_done(struct netlink_callback *cb) static const struct get_request_ops *ethnl_std_notify_to_ops(unsigned int cmd) { + switch (cmd) { + case ETHTOOL_MSG_LINKINFO_NTF: + return &linkinfo_request_ops; + }; + WARN_ONCE(1, "unexpected notification type %u\n", cmd); return NULL; } @@ -683,6 +688,7 @@ typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd, const void *data); static const ethnl_notify_handler_t ethnl_notify_handlers[] = { + [ETHTOOL_MSG_LINKINFO_NTF] = ethnl_std_notify, }; void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data) @@ -717,6 +723,11 @@ static const struct genl_ops ethtool_genl_ops[] = { .dumpit = ethnl_get_dumpit, .done = ethnl_get_done, }, + { + .cmd = ETHTOOL_MSG_LINKINFO_SET, + .flags = GENL_UNS_ADMIN_PERM, + .doit = ethnl_set_linkinfo, + }, }; static const struct genl_multicast_group ethtool_nl_mcgrps[] = { diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h index 23e82a4dd265..ca136dd7ea02 100644 --- a/net/ethtool/netlink.h +++ b/net/ethtool/netlink.h @@ -350,4 +350,6 @@ struct get_request_ops { extern const struct get_request_ops strset_request_ops; extern const struct get_request_ops linkinfo_request_ops; +int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info); + #endif /* _NET_ETHTOOL_NETLINK_H */ -- 2.23.0
