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[95.239.254.7]) by smtp.googlemail.com with ESMTPSA id l15sm4736146edb.48.2021.04.11.08.03.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Apr 2021 08:04:00 -0700 (PDT) From: Ansuel Smith To: netdev@vger.kernel.org Cc: =?utf-8?q?Marek_Beh=C3=BAn?= , "David S. Miller" , Jakub Kicinski , Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eric Dumazet , Wei Wang , Cong Wang , Taehee Yoo , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Nikolay Aleksandrov , Roopa Prabhu , Di Zhu , Francis Laniel , linux-kernel@vger.kernel.org Subject: [PATCH RFC net-next 2/3] net: add ndo for setting the iflink property Date: Sat, 10 Apr 2021 15:34:48 +0200 Message-Id: <20210410133454.4768-3-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210410133454.4768-1-ansuelsmth@gmail.com> References: <20210410133454.4768-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Marek Behún In DSA the iflink value is used to report to which CPU port a given switch port is connected to. Since we want to support multi-CPU DSA, we want the user to be able to change this value. Add ndo_set_iflink method into the ndo strucutre to be a pair to ndo_get_iflink. Also create dev_set_iflink and call this from the netlink code, so that userspace can change the iflink value. Signed-off-by: Marek Behún --- include/linux/netdevice.h | 5 +++++ net/core/dev.c | 15 +++++++++++++++ net/core/rtnetlink.c | 7 +++++++ 3 files changed, 27 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 87a5d186faff..76054182c288 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1225,6 +1225,8 @@ struct netdev_net_notifier { * TX queue. * int (*ndo_get_iflink)(const struct net_device *dev); * Called to get the iflink value of this device. + * int (*ndo_set_iflink)(struct net_device *dev, int iflink); + * Called to set the iflink value of this device. * void (*ndo_change_proto_down)(struct net_device *dev, * bool proto_down); * This function is used to pass protocol port error state information @@ -1456,6 +1458,8 @@ struct net_device_ops { int queue_index, u32 maxrate); int (*ndo_get_iflink)(const struct net_device *dev); + int (*ndo_set_iflink)(struct net_device *dev, + int iflink); int (*ndo_change_proto_down)(struct net_device *dev, bool proto_down); int (*ndo_fill_metadata_dst)(struct net_device *dev, @@ -2845,6 +2849,7 @@ void dev_add_offload(struct packet_offload *po); void dev_remove_offload(struct packet_offload *po); int dev_get_iflink(const struct net_device *dev); +int dev_set_iflink(struct net_device *dev, int iflink); int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, unsigned short mask); diff --git a/net/core/dev.c b/net/core/dev.c index 0f72ff5d34ba..9e5ddcf6d401 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -822,6 +822,21 @@ int dev_get_iflink(const struct net_device *dev) } EXPORT_SYMBOL(dev_get_iflink); +/** + * dev_set_iflink - set 'iflink' value of an interface + * @dev: target interface + * @iflink: new value + * + * Change the interface to which this interface is linked to. + */ +int dev_set_iflink(struct net_device *dev, int iflink) +{ + if (dev->netdev_ops && dev->netdev_ops->ndo_set_iflink) + return dev->netdev_ops->ndo_set_iflink(dev, iflink); + + return -EOPNOTSUPP; +} + /** * dev_fill_metadata_dst - Retrieve tunnel egress information. * @dev: targeted interface diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 1bdcb33fb561..629b7685f942 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2718,6 +2718,13 @@ static int do_setlink(const struct sk_buff *skb, status |= DO_SETLINK_MODIFIED; } + if (tb[IFLA_LINK]) { + err = dev_set_iflink(dev, nla_get_u32(tb[IFLA_LINK])); + if (err) + goto errout; + status |= DO_SETLINK_MODIFIED; + } + if (tb[IFLA_CARRIER]) { err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); if (err)