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([192.19.161.250]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c37f4a794bsm1472324885a.9.2026.01.11.22.33.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jan 2026 22:33:53 -0800 (PST) From: Keerthana K To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, yoshfuji@linux-ipv6.org, dsahern@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, borisp@nvidia.com, john.fastabend@gmail.com, sashal@kernel.org, leitao@debian.org, kuniyu@amazon.com, willemb@google.com, jramaseu@redhat.com, aviadye@mellanox.com, ilyal@mellanox.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, vamsi-krishna.brahmajosyula@broadcom.com, yin.ding@broadcom.com, tapas.kundu@broadcom.com, Tariq Toukan , Keerthana K Subject: [PATCH v5.10.y 2/3] net: netdevice: Add operation ndo_sk_get_lower_dev Date: Mon, 12 Jan 2026 06:30:38 +0000 Message-ID: <20260112063039.2968980-3-keerthana.kalyanasundaram@broadcom.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260112063039.2968980-1-keerthana.kalyanasundaram@broadcom.com> References: <20260112063039.2968980-1-keerthana.kalyanasundaram@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" From: Tariq Toukan [ Upstream commit 719a402cf60311b1cdff3f6320abaecdcc5e46b7] ndo_sk_get_lower_dev returns the lower netdev that corresponds to a given socket. Additionally, we implement a helper netdev_sk_get_lowest_dev() to get the lowest one in chain. Signed-off-by: Tariq Toukan Reviewed-by: Boris Pismenny Signed-off-by: Jakub Kicinski [ Keerthana: Backported the patch to v5.10.y ] Signed-off-by: Keerthana K --- include/linux/netdevice.h | 4 ++++ net/core/dev.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d3a3e77a18df..c9f2a88a6c83 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1435,6 +1435,8 @@ struct net_device_ops { struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev, struct sk_buff *skb, bool all_slaves); + struct net_device* (*ndo_sk_get_lower_dev)(struct net_device *dev, + struct sock *sk); netdev_features_t (*ndo_fix_features)(struct net_device *dev, netdev_features_t features); int (*ndo_set_features)(struct net_device *dev, @@ -2914,6 +2916,8 @@ int init_dummy_netdev(struct net_device *dev); struct net_device *netdev_get_xmit_slave(struct net_device *dev, struct sk_buff *skb, bool all_slaves); +struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, + struct sock *sk); struct net_device *dev_get_by_index(struct net *net, int ifindex); struct net_device *__dev_get_by_index(struct net *net, int ifindex); struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); diff --git a/net/core/dev.c b/net/core/dev.c index c0dc524548ee..ad2be47b48a9 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -8169,6 +8169,39 @@ struct net_device *netdev_get_xmit_slave(struct net_= device *dev, } EXPORT_SYMBOL(netdev_get_xmit_slave); =20 +static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev, + struct sock *sk) +{ + const struct net_device_ops *ops =3D dev->netdev_ops; + + if (!ops->ndo_sk_get_lower_dev) + return NULL; + return ops->ndo_sk_get_lower_dev(dev, sk); +} + +/** + * netdev_sk_get_lowest_dev - Get the lowest device in chain given device = and socket + * @dev: device + * @sk: the socket + * + * %NULL is returned if no lower device is found. + */ + +struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, + struct sock *sk) +{ + struct net_device *lower; + + lower =3D netdev_sk_get_lower_dev(dev, sk); + while (lower) { + dev =3D lower; + lower =3D netdev_sk_get_lower_dev(dev, sk); + } + + return dev; +} +EXPORT_SYMBOL(netdev_sk_get_lowest_dev); + static void netdev_adjacent_add_links(struct net_device *dev) { struct netdev_adjacent *iter; --=20 2.43.7